CA1276389C - Process for the production of a cellular polyurethane - Google Patents
Process for the production of a cellular polyurethaneInfo
- Publication number
- CA1276389C CA1276389C CA000531287A CA531287A CA1276389C CA 1276389 C CA1276389 C CA 1276389C CA 000531287 A CA000531287 A CA 000531287A CA 531287 A CA531287 A CA 531287A CA 1276389 C CA1276389 C CA 1276389C
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- Prior art keywords
- weight
- amine
- primary
- optionally
- carbon dioxide
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/6505—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen the low-molecular compounds being compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6523—Compounds of group C08G18/3225 or C08G18/3271 or polyamines of C08G18/38
- C08G18/6535—Compounds of group C08G18/3271
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3271—Hydroxyamines
- C08G18/3296—Hydroxyamines being in latent form
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
A PROCESS FOR THE PRODUCTION OF
A CELLULAR POLYURETHANE
ABSTRACT OF THE DISCLOSURE
The present invention is directed to a process for preparing a cellular polyurethane by reacting with an NCO-reactive component in the presence of a homogeneous mixture of an optionally water-containing adduct of carbon dioxide an amine containing at least one secondary amino group, low primary amino groups and at least one primary or secondary hydroxyl group (provided there are not more primary hydroxyl groups than amino groups), an amine catalyst and optionally monofluorotrichlor-methane. The present invention is directed to the homogeneous mixture these three components.
A CELLULAR POLYURETHANE
ABSTRACT OF THE DISCLOSURE
The present invention is directed to a process for preparing a cellular polyurethane by reacting with an NCO-reactive component in the presence of a homogeneous mixture of an optionally water-containing adduct of carbon dioxide an amine containing at least one secondary amino group, low primary amino groups and at least one primary or secondary hydroxyl group (provided there are not more primary hydroxyl groups than amino groups), an amine catalyst and optionally monofluorotrichlor-methane. The present invention is directed to the homogeneous mixture these three components.
Description
3~3~
Mo-2902 LeA 24,413 A PROC~SS FOR THE PRODUCTION OF
A CELLULAR POLYURET~NE
BACKGROUND OF THE INVENTION
Field of the Invention This invention relates to a process for the pro~uction of cellular polyurethanes using special amine-carbon dioxi~e adducts and to homogeneous mixtures of these adducts, optiollally with monofluorotrichloromethane, Description of the Prior Art The process known among experts as "frothing"
has been successfully used in the production of foams, particularly rigid foams, based on polyurethanes. In the frothing process, the reaction mixture is prepared in such a way that it actually enters the mold cavity in the form of a creamy foam. The advantage of this lies in the stable, continuous flow front which guarantees high surface quality. The need to include a blowing agent, which frequently causes swelling in the end product, is avoided.
This process is used in particular for certain refrigerator constructions and for large, heavily insulated refrigerators where the still foaming liquid reaction mixture is able to flow out from leaks in the cabinet which can necesitate expensive finishing wor~.
~ 25 The frothing effect is obtained, for example, - by addition of a low-boiling blowing agent, such as difluorodichloromethane or a mixture of monofluoro-trichloromethane and difluorodichloromethane.
For example, in a standard commercial rigid foam o the type used for insulating refrigerating cabinets, if part of the monofluorotrichloromethane blowing agent (boiling point ~23.7C) is replaced by dichlorodifluoromethane (R 12, boiling point -29.8C) and if the dichlorodifluoromethane is introduced into Mo-~902 ~!i.%~3~!3 the polyol under pressure in liquid form, the reaction mixture emerges from the mixing head of the proportioning machine in creamy, prefoamed form through spontaneous evaporation of the R 12. In this form, the 5 reaction mixture is unable to flow out fxom leaks in the refrigerator cabinet.
Unfortunately, the frothing process is by no means a universal solution to sealing problems. Once the foamin~ reaction mixture has filled the walls of ~he 10 refri~erator cabinet, it is able to flow out from leaks, despite frothing, because of the foaming pressure. The flowing agents or blowin~ a~ent mixtures in question ~re difficult to process because their boiling points are below 0C and because they have to be supplied in 15 pressure cylinders. Proportioning the blowing agents through pumps of any type involves problems because the stoichiometric ratios involved have to be carefully maintained, which is ~ery difficult when high-performance piston pumps are used due to leaks.
The frothing effect may also be obtained by the addition of large amounts of gas. For example, an expanded gas (such as air or nitrogen) is introduced into the polyol component in a quantity of about 0.4 ~o about 0.8 g per liter of polyol. ~imilar problems are 25 involved here. Proportioning of the gas is carried out with flow meters and, accordingly, is inaccurate. The gas hâs to be very finely dispersed in the component because when the usual high pressure pumps are used for proportioning, it is only by intensive mixing that the required effects can be obtained. Further the mixture of gas and polyol component has to be kept under such high pressure that no proportioning errors are produced by the gas bubbles mixed in.
It hâs âlsO been found that if the proportion Of mOnOfluOrotrichloromethâne which boils at 23.5C is 35 reduced and replaced by difluorodichloromethane or gas, ~o-2902 :' '' '' ' " ".
~ 3 ~ ~
the quality of the outer skin is seriously affected both in hardness and in thickness.
In addition, fluorinated hydrocarbons have been criticized by ecologists, for example by P. Fabian, Die Naturwissenschaf~en 67 (1980), pages 109 to 120~ and C.R. Patrick, J. Fluorine Chem. 25 (1984), pages 7 to 15.
Accordingly, an object of the present invention is to provide a process for the production of rigid polyurethane foams by frothing which is not attended by any of the disadvantages of conventional processes and which a) may be carried out both in fixed industrial installa~ions and also in situ using small mobile units, b) has physiological advantages over convelltional processes using dichlorodifluoromethane and c) combines high operational reliability with improved handling.
According to the invention, these objects are achieved by the use of a special alkanolamine-CO2 adduct and/or alkanolamine-CO -water adduct in combination with a tertiary amine catalyst and optionally monofluorotri-chloromethane in the form of a homogeneous mixture as blowing agent.
The use of carbon dioxide adducts of hydroxyl-amines in the production of polyurethanes is known.
DE-OS 2,200,480 mentions the use of ethanolamine carbamate in a process for the production of a cellular PU-elastomer; however, this prior publication does not state whether the ethanolamine carbamate is solid or liquid. In addition, it is apparent from DE-PS
Mo-2902 LeA 24,413 A PROC~SS FOR THE PRODUCTION OF
A CELLULAR POLYURET~NE
BACKGROUND OF THE INVENTION
Field of the Invention This invention relates to a process for the pro~uction of cellular polyurethanes using special amine-carbon dioxi~e adducts and to homogeneous mixtures of these adducts, optiollally with monofluorotrichloromethane, Description of the Prior Art The process known among experts as "frothing"
has been successfully used in the production of foams, particularly rigid foams, based on polyurethanes. In the frothing process, the reaction mixture is prepared in such a way that it actually enters the mold cavity in the form of a creamy foam. The advantage of this lies in the stable, continuous flow front which guarantees high surface quality. The need to include a blowing agent, which frequently causes swelling in the end product, is avoided.
This process is used in particular for certain refrigerator constructions and for large, heavily insulated refrigerators where the still foaming liquid reaction mixture is able to flow out from leaks in the cabinet which can necesitate expensive finishing wor~.
~ 25 The frothing effect is obtained, for example, - by addition of a low-boiling blowing agent, such as difluorodichloromethane or a mixture of monofluoro-trichloromethane and difluorodichloromethane.
For example, in a standard commercial rigid foam o the type used for insulating refrigerating cabinets, if part of the monofluorotrichloromethane blowing agent (boiling point ~23.7C) is replaced by dichlorodifluoromethane (R 12, boiling point -29.8C) and if the dichlorodifluoromethane is introduced into Mo-~902 ~!i.%~3~!3 the polyol under pressure in liquid form, the reaction mixture emerges from the mixing head of the proportioning machine in creamy, prefoamed form through spontaneous evaporation of the R 12. In this form, the 5 reaction mixture is unable to flow out fxom leaks in the refrigerator cabinet.
Unfortunately, the frothing process is by no means a universal solution to sealing problems. Once the foamin~ reaction mixture has filled the walls of ~he 10 refri~erator cabinet, it is able to flow out from leaks, despite frothing, because of the foaming pressure. The flowing agents or blowin~ a~ent mixtures in question ~re difficult to process because their boiling points are below 0C and because they have to be supplied in 15 pressure cylinders. Proportioning the blowing agents through pumps of any type involves problems because the stoichiometric ratios involved have to be carefully maintained, which is ~ery difficult when high-performance piston pumps are used due to leaks.
The frothing effect may also be obtained by the addition of large amounts of gas. For example, an expanded gas (such as air or nitrogen) is introduced into the polyol component in a quantity of about 0.4 ~o about 0.8 g per liter of polyol. ~imilar problems are 25 involved here. Proportioning of the gas is carried out with flow meters and, accordingly, is inaccurate. The gas hâs to be very finely dispersed in the component because when the usual high pressure pumps are used for proportioning, it is only by intensive mixing that the required effects can be obtained. Further the mixture of gas and polyol component has to be kept under such high pressure that no proportioning errors are produced by the gas bubbles mixed in.
It hâs âlsO been found that if the proportion Of mOnOfluOrotrichloromethâne which boils at 23.5C is 35 reduced and replaced by difluorodichloromethane or gas, ~o-2902 :' '' '' ' " ".
~ 3 ~ ~
the quality of the outer skin is seriously affected both in hardness and in thickness.
In addition, fluorinated hydrocarbons have been criticized by ecologists, for example by P. Fabian, Die Naturwissenschaf~en 67 (1980), pages 109 to 120~ and C.R. Patrick, J. Fluorine Chem. 25 (1984), pages 7 to 15.
Accordingly, an object of the present invention is to provide a process for the production of rigid polyurethane foams by frothing which is not attended by any of the disadvantages of conventional processes and which a) may be carried out both in fixed industrial installa~ions and also in situ using small mobile units, b) has physiological advantages over convelltional processes using dichlorodifluoromethane and c) combines high operational reliability with improved handling.
According to the invention, these objects are achieved by the use of a special alkanolamine-CO2 adduct and/or alkanolamine-CO -water adduct in combination with a tertiary amine catalyst and optionally monofluorotri-chloromethane in the form of a homogeneous mixture as blowing agent.
The use of carbon dioxide adducts of hydroxyl-amines in the production of polyurethanes is known.
DE-OS 2,200,480 mentions the use of ethanolamine carbamate in a process for the production of a cellular PU-elastomer; however, this prior publication does not state whether the ethanolamine carbamate is solid or liquid. In addition, it is apparent from DE-PS
2,621,582 that carbamates, which are reaction products o~ primary or secondary amines containing 1 or 2 hydroxyl groups with carbon dioxide, are solid or may be Mo-2902 -3-~ 3 ~ ~
obtained in solid form if they are prepared by introduction of carbon dioxide into alcohols or other solvents and cannot be homogeneously mixed in a single phase, even with a polyol. It is not apparent from this 5 publication that the carbon dioxide adducts in question are liquid a~ room ~emperature or may be obtained in liqui~ form.
Liquid carbamates of compounds containing amino groups are described in DE-OS 1l570,571. Howe~rer, these 10 amines are limited to diamines or polyamines containing ether groups in which about 0.01 to 50% of the amino : groups may be replaced by a hydroxyl ~roup. However, the amines preferably used are high molecular weight amines with, in general, only a small content of basic 15 nitrogen and amino groups often present as secondary nitrogen atoms which only allow a low uptake of carbon dioxide.
The use of ~he products according to DE-OS
2,200,480 and DE-PS 2,621,582 for the production of 20 polyurethane foams is also known.
According to DE-OS 2,200,480, the amine carbamates generally loose their thermal stability and decompose at temperatures above about 35C. The same teaching can be found in DE-OS 1,570,571, in that the 25 amines in ques~i-on may only be converted into carbamates by reaction with CO2 at -40 to ~40C and preferably a~ 0 to 20C. ~he carbamates prepared by way of example in this prior publication largely decompose at te~peratures as low as room temperature or 30C.
According to EP 121,850, carbon dioxide adducts of monoamines or polyamines containing one or more hydroxyalkyl groups tthe amino groups ma~ be primary, secondary and/or tertiary amino groups and may be substituents or chain members in acyclic or cyclic 35 aliphatic parent compounds? are obtained in liquid form Mo-2902 ' ' . : ' '. : , .
~ 3 ~ ~
and remain ln liquid form wi~hout crystallizing provided they are prepared by the addition of amines containing hydroxyl groups to carbon dioxide and, optionally water.
The adducts thus prepared are said to be homogeneously 5 soluble in the polyols normally used for the production of polyurethanes, especially those having a functionality of greater than 2 and a molecular weight of 60 to 2000.
EP 121,850 also teaches that not only 10 carba~,ates (i.e., ammonium salts of alkylcarbamate acids), but also carbonic acid salts (formed by carrying out the reaction of the polyamines containing hydroxyl groups with carbon dioxide in the presence of water) and mixtures ~hereof are liquid. The differences between 15 carbama~es as salts of carbamic acid and carbonates or nydrogen carbonates as salts of carbonic acid are well known and described for example, in A. Smola, Mitteilungen der Chemischen Forschungsinstituts der Wirtschaft Osterreichs 2, 38-40 and 43-45 (1948) 20 (Chemical Abstracts 43 (1949), 6157 h).
However, it has been found that many of these products cannot be stored with trichlorofluoromethane or stored for prolonged periods in the polyol component without suf~ering a distinct reduction in reactivity.
Accordingly, a particular object of the present in~ention is to provide a process in which trichloro-fluoromethane and an aminoalcohol-CO2 adduct can be stored together without any substantial change in reactivity and without the need for stabilizer or other 30 known auxiliary.
SUMMARY OF THE INVENTION
The present invention is directed to a process for the production of a cellular polyurethane by reacting A) a polyisocyanate with Mo-2902 .
.~, %1~
B) an NCO-reactive component containing l) a compound containing at least one NCO-reactive group and having a molecular weight of 60 to 1999 and a functionality of from 2 to 8, 5 2) optionally a compound containing at least one NCO-reactive group and having a molecular weight of 2000 to about 12,000 and a functionality of from 2 to 8, in the presence of a homogeneous mixture containing, based on 100 parts by weight B 1. ~ B 2. 9 3) about 0.05 to 25 parts by weigh~ of an optionally water-containing adduct of carbon dioxide with an amine containing at least one secondary amino group, no prlmary amlno groups and at least one primary or secondary hydroxyl group provided there are not more primary hydroxyl groups than amino groups, and 4) about 0.05 to 25 parts by weight of an amine catalyst, and optionally 5) about 0.5 to 50 parts by weight of monofluoro-trichloromethane, optionally in the presence of C) water and/or further inorganic or organic blowing agents, foam stabilizers and other additives usual in the production of cellular polyurethanes, The present invention is also directed to a homogeneous mixture containing components B 3., B 4., and B 5.
~ETAILED DESCRIPTION OF THE INVENTION
In a preferred embodiment of the process, the amine-carbon dioxide adduct is obtained by the reaction of carbon dioxide with an amine at ~emperatures of -25C
to fl60C, optionally in the presence of water and/or polyols containing 2 to 8 hydro~yl groups and having an 35 OH number above 112 wherein the reaction is conducted in the absence of the following solvents: optionally halogena~ed aliphatic hydrocarbons, optionally nitrated, halogenated or alkylated aromatic hydrocarbons, low Mo-2902 -6-:
.
.' .'. . .. , ~:, ' ' ' ' . ':
... . . .
., .
.~ 7 ~ 3 ~
~olecular weight aliphatic alcohols, acid amides, lactams and aprotic-polar solvents.
According to the invention, a preferred amine-carbon dioxide adduct is one whlch a) has a basic nitrogen content of about 3.5 to 17.5% by weight, preferably about 3.5 to 12% by weight, b) a hydroxyl group content of about 8.5 to 23% by weight, preferably about 8.5 to 14.5% by weight, c) a carbon dioxide content of about 1 to 37%
by weight, preferably about 2.5 to 37% by weight and d) a water content of 0 to 15~ by weight.
In another preferred embodiment of the process according to the invention, optionally modified toluene diisocyanates or phosgenation products of formaldehyde-aniline condensates are used as the polyisocyanates and polyethers containing from 3 to 6 hydroxyl groups and 20 having a molecular weight of about 200 to 1000 are used as component B 1, A particularly preferred carbon dioxide-amine adduc~ is the optionally water-containing CO2-adduct of - N-methyl-2-aminoethanol.
The frothing process is advantageously used in accordance with the invention.
It is particularly surprising that mixtures of ; CFC13 with the CO2-adduc~s of aminoalcohols containing secondary amino groups are more stable in storage than 30 mixtures of CFC13 with CO2-adducts of aminoalcohols containing primary amino groups. Dichloromethane for example is known to have precisely the opposite effec~, cf. for example J.E. Mills et al., Org. Prep. Proced.
Int. 16 (1984), 97-114.
.
, Mo-2902 .
. ~ ' .
. .
'' ,. ~
~ 3 ~9 The process according to the invention affords the following advantages:
1. Replacement of part of the fluorochlorinated hydrocarbon by carbon dioxide which i5 less harmful to the enviroment.
2. Storable formulation o trichlorofluoromethane and aminoalcohol-CO2 adduct without any need for stabilizers.
3. Very good foaming properties which are superior to the prior art with regard to flow, sealing of leaks and production reliability. The bubble formation observed when dichlorofluoromethane is used as frothing agent no longer occurs.
4. The aminoalcohol-CO2 adducts act favorably as co-catalysts. They are incorporated and thus contribute towards reducing the odor level of the foam sections. The combination of t-amine c&talyst and aminoalcohol adduct satisfies the following requirements:
2n negligible odor emission, immediate initial foaming, complete foaming and rapid hardening.
5. The absenc~ of blowin~ agents boiling at temperatures below 20C provides for technical simplifications because the polyol component no longer has to be stored under pressure. This also applies to in situ frothing.
obtained in solid form if they are prepared by introduction of carbon dioxide into alcohols or other solvents and cannot be homogeneously mixed in a single phase, even with a polyol. It is not apparent from this 5 publication that the carbon dioxide adducts in question are liquid a~ room ~emperature or may be obtained in liqui~ form.
Liquid carbamates of compounds containing amino groups are described in DE-OS 1l570,571. Howe~rer, these 10 amines are limited to diamines or polyamines containing ether groups in which about 0.01 to 50% of the amino : groups may be replaced by a hydroxyl ~roup. However, the amines preferably used are high molecular weight amines with, in general, only a small content of basic 15 nitrogen and amino groups often present as secondary nitrogen atoms which only allow a low uptake of carbon dioxide.
The use of ~he products according to DE-OS
2,200,480 and DE-PS 2,621,582 for the production of 20 polyurethane foams is also known.
According to DE-OS 2,200,480, the amine carbamates generally loose their thermal stability and decompose at temperatures above about 35C. The same teaching can be found in DE-OS 1,570,571, in that the 25 amines in ques~i-on may only be converted into carbamates by reaction with CO2 at -40 to ~40C and preferably a~ 0 to 20C. ~he carbamates prepared by way of example in this prior publication largely decompose at te~peratures as low as room temperature or 30C.
According to EP 121,850, carbon dioxide adducts of monoamines or polyamines containing one or more hydroxyalkyl groups tthe amino groups ma~ be primary, secondary and/or tertiary amino groups and may be substituents or chain members in acyclic or cyclic 35 aliphatic parent compounds? are obtained in liquid form Mo-2902 ' ' . : ' '. : , .
~ 3 ~ ~
and remain ln liquid form wi~hout crystallizing provided they are prepared by the addition of amines containing hydroxyl groups to carbon dioxide and, optionally water.
The adducts thus prepared are said to be homogeneously 5 soluble in the polyols normally used for the production of polyurethanes, especially those having a functionality of greater than 2 and a molecular weight of 60 to 2000.
EP 121,850 also teaches that not only 10 carba~,ates (i.e., ammonium salts of alkylcarbamate acids), but also carbonic acid salts (formed by carrying out the reaction of the polyamines containing hydroxyl groups with carbon dioxide in the presence of water) and mixtures ~hereof are liquid. The differences between 15 carbama~es as salts of carbamic acid and carbonates or nydrogen carbonates as salts of carbonic acid are well known and described for example, in A. Smola, Mitteilungen der Chemischen Forschungsinstituts der Wirtschaft Osterreichs 2, 38-40 and 43-45 (1948) 20 (Chemical Abstracts 43 (1949), 6157 h).
However, it has been found that many of these products cannot be stored with trichlorofluoromethane or stored for prolonged periods in the polyol component without suf~ering a distinct reduction in reactivity.
Accordingly, a particular object of the present in~ention is to provide a process in which trichloro-fluoromethane and an aminoalcohol-CO2 adduct can be stored together without any substantial change in reactivity and without the need for stabilizer or other 30 known auxiliary.
SUMMARY OF THE INVENTION
The present invention is directed to a process for the production of a cellular polyurethane by reacting A) a polyisocyanate with Mo-2902 .
.~, %1~
B) an NCO-reactive component containing l) a compound containing at least one NCO-reactive group and having a molecular weight of 60 to 1999 and a functionality of from 2 to 8, 5 2) optionally a compound containing at least one NCO-reactive group and having a molecular weight of 2000 to about 12,000 and a functionality of from 2 to 8, in the presence of a homogeneous mixture containing, based on 100 parts by weight B 1. ~ B 2. 9 3) about 0.05 to 25 parts by weigh~ of an optionally water-containing adduct of carbon dioxide with an amine containing at least one secondary amino group, no prlmary amlno groups and at least one primary or secondary hydroxyl group provided there are not more primary hydroxyl groups than amino groups, and 4) about 0.05 to 25 parts by weight of an amine catalyst, and optionally 5) about 0.5 to 50 parts by weight of monofluoro-trichloromethane, optionally in the presence of C) water and/or further inorganic or organic blowing agents, foam stabilizers and other additives usual in the production of cellular polyurethanes, The present invention is also directed to a homogeneous mixture containing components B 3., B 4., and B 5.
~ETAILED DESCRIPTION OF THE INVENTION
In a preferred embodiment of the process, the amine-carbon dioxide adduct is obtained by the reaction of carbon dioxide with an amine at ~emperatures of -25C
to fl60C, optionally in the presence of water and/or polyols containing 2 to 8 hydro~yl groups and having an 35 OH number above 112 wherein the reaction is conducted in the absence of the following solvents: optionally halogena~ed aliphatic hydrocarbons, optionally nitrated, halogenated or alkylated aromatic hydrocarbons, low Mo-2902 -6-:
.
.' .'. . .. , ~:, ' ' ' ' . ':
... . . .
., .
.~ 7 ~ 3 ~
~olecular weight aliphatic alcohols, acid amides, lactams and aprotic-polar solvents.
According to the invention, a preferred amine-carbon dioxide adduct is one whlch a) has a basic nitrogen content of about 3.5 to 17.5% by weight, preferably about 3.5 to 12% by weight, b) a hydroxyl group content of about 8.5 to 23% by weight, preferably about 8.5 to 14.5% by weight, c) a carbon dioxide content of about 1 to 37%
by weight, preferably about 2.5 to 37% by weight and d) a water content of 0 to 15~ by weight.
In another preferred embodiment of the process according to the invention, optionally modified toluene diisocyanates or phosgenation products of formaldehyde-aniline condensates are used as the polyisocyanates and polyethers containing from 3 to 6 hydroxyl groups and 20 having a molecular weight of about 200 to 1000 are used as component B 1, A particularly preferred carbon dioxide-amine adduc~ is the optionally water-containing CO2-adduct of - N-methyl-2-aminoethanol.
The frothing process is advantageously used in accordance with the invention.
It is particularly surprising that mixtures of ; CFC13 with the CO2-adduc~s of aminoalcohols containing secondary amino groups are more stable in storage than 30 mixtures of CFC13 with CO2-adducts of aminoalcohols containing primary amino groups. Dichloromethane for example is known to have precisely the opposite effec~, cf. for example J.E. Mills et al., Org. Prep. Proced.
Int. 16 (1984), 97-114.
.
, Mo-2902 .
. ~ ' .
. .
'' ,. ~
~ 3 ~9 The process according to the invention affords the following advantages:
1. Replacement of part of the fluorochlorinated hydrocarbon by carbon dioxide which i5 less harmful to the enviroment.
2. Storable formulation o trichlorofluoromethane and aminoalcohol-CO2 adduct without any need for stabilizers.
3. Very good foaming properties which are superior to the prior art with regard to flow, sealing of leaks and production reliability. The bubble formation observed when dichlorofluoromethane is used as frothing agent no longer occurs.
4. The aminoalcohol-CO2 adducts act favorably as co-catalysts. They are incorporated and thus contribute towards reducing the odor level of the foam sections. The combination of t-amine c&talyst and aminoalcohol adduct satisfies the following requirements:
2n negligible odor emission, immediate initial foaming, complete foaming and rapid hardening.
5. The absenc~ of blowin~ agents boiling at temperatures below 20C provides for technical simplifications because the polyol component no longer has to be stored under pressure. This also applies to in situ frothing.
6. ~o danger of unwanted change of index by intentional and/or premature evaporation of ~he low-boiling blowing a~ent.
The follo~7ing materials may be used in the process according to the invention.
Component A includes aliphatic, cycloaliphatic, araliphatic, aromatic and heterocyclic polyisocyanate o the type described, for example, by W. Siefken in 35 Justus Liebigs Annalen der Chemie, 562, pages 75 to 136, for example those corresponding to the formula Mo-2902 .
, ' '. . , : - .
. . - , , ; ~ , , ~ . .' . ~ ~ ." - , .
, . . ~ . . .
~ ' ' ' , , ~ ' ' -~ 3 Q (NCO)n in which n = 2 to 4, preferably 2 and Q is an aliphatic hydrocarbon radical containing 4 to 18, preferably 6 to 10 carbon atoms; a cycloali-phatic hydrocarbon radical containing 4 to 15, preferably 5 to 10 carbon atoms; an aromatic hydrocarbon radical containing 6 to 15, preferably 6 to 13 carbon atoms; or an araliphatic hydrocarbon o radical containing 8 to 15, preferably 8 to 13 carbon atoms.
Examples include 1,6-hexamethylene diisocyanate, 1,12-dodecane diisocyanate, cyclohexane-1,3- and -1,4-diisocyanate and mixtures of these isomers, l-iso-cyanato-3,3,5 trimethyl-5-isocyanatomethylcyclohexane (DE-AS 1,202,785, US-PS 3,401,190), 2,4- and 2,6-hexa-hydrotoluene diisocyanate and mixtures of these isomers, he~ahydro-1,3- and/or -4,4'-diphenylmethane diisocyanate, 1,3- and 1,4-phenylene diisocyanate, 2,4-20 . and 2,6-toluene diisocyanate and mixtures of these isomers, diphenylmethane-2,4'- and/or -4,4'-diisocyanate and naphthylene-1,5-diisocyanate.
Further examples of polyisocyanates which may be used in accordance with ~he in~ention are described in DE-OS 3,312,215, pages 19 to 21 (U.S. Patent 4,500,65~, at column 7~.
Aromatic polyisocyanates are preferably used, particularly preferred are the commercially available polyisocyanates such as 2,~- and 2,6-toluene diisocyanate and mixtures of these isomers ("TDI"), polyphenyl-polymethylene polyisocyanates of the type obtained by phosgenating aniline-formaldehyde Mo-2902 -9-', 1,~ ~ ' -': ' ' ,: , .' ' ~ ~ .
~.2 ~
co~densates ("crude MDI") and polyisocyanates containing carbodiimide groups, urethane groups, allophanate groups, isocyanurate groups, urea groups or biuret groups ("modified polyisocyanates"), particularly those 5 modified polyisocyanates which are derived from 2,4-and/or 2,6- tolylene diisocyanate.
Starting component B l includes compounds containing at least two isocyanate reactive hydrogen atoms and generally ha~ing a molecular weight of from lO about 60 to 1999. These include compounds containing amino groups, thiol groups or carboxyl groups or preferably hydroxyl groups, in particular from 2 to 8 hydroxvl groups, especially those with molecular weights of from about 200 to 1000, preferably from about 300 to 15 800, e.g. polyesters, polyethers, polythioethers, polyacetals, polycarbonates and polyester amides havin~
at least 2, generally 2 ~o 8, preferably 2 ~o 6 hydroxyl groups, such as the known compounds used for the preparation of both homogeneous and cellular 20 polyurethanes. Polyether polyols are particularly pre~erred.
The hydroxypolyethers containing at least 2, generally 2 to 8, preferably 2 to 6 hydroxyl groups, which may also be used according to the invention and 25 are in fact preferred, are kno~n per se and may be prepared, for example, by the polymerization of epoxides such as ethylene oxide, propylene oxide, butylene oxide, tetrahydrofuran, styrene oxide or epichlorohydrin either - on their own, e.g. in the presence of Lewis catalysts 30 such as BF3 or by their che~ical addition, preferably the addition of ethylene oxide and propylene oxide, optionally as mixtures or successively, to starting components containing reactive hydrogen atoms, such as water, alcohols, ammonia or amines, for exa~,ple the 35 following: ethylene glycol, propylene glycol-tl,3) and Mo-2902 , ~' ' ' ' ; , .
. . . .
, ~ 3 ~ ~
(1,2?, trimethylolpropane, glycerol, sorbitol, ~annitol, quinitol, trimethylolethane, pentaerythritol, hexanetriol-(1,2,6), 4,4'-dihydroxy-diphenylpropane, aniline, ethanola~line or ethylene diamine. Sucrose 5 polyethers such as those described, for example, in German Auslegeschriften Nos. 1,176,358 and 1,064,938 flr.d polyethers started on formitol or formose (Ger~an Offenlegungsschriften Nos. 2,639,083 and 2,737,951) may also be used according to the invention. It is 10 frequently pre~erred to use polyethers containing predominantly primary OH groups (up to about 90% by weight thereof, based Oll all of the OH groups in the polyether).
Other suitable compounds are described in 15 detail in DE-OS 3,312,215, pages 21 to 37, (U.S. Pater.t 4,500,656, columns 8-14).
Compounds belonging to component B 2 include polyether polyols obtained from the units described above, provided they have molecular weights of 2000 or 20 greater and polyesters, polybutadienes, polythioethers, polyacetals, polycarbonates, polyester amides and polyamides of known type containing OH, NH andtor SH
groups provided they have molecular weights of 2000 or greater and the other types of compounds mentioned in 25 ~E-OS 3,312,215 (U.S. Patent 4,500,656~ pro~ided the~
have molecular weights above 2000.
Component B 3. includes the amine-carbon dioxide adducts which are liquid, but preferably solid, at 20C ar.d obtained by the action of carbon dioxide on 30 amines, optionallv in the pres~nce of water, at temperatures of about -25C to 160C, preferably about 0 to 130C and most preferably about 15 to 100C. The reaction is conducted in the absence of the following solvents: optionally halogenated, aliphatic 35 hydrocarbons, optionally nitrated, halogenated or Mo-2902 ~ 7~ 3 ~ ~
alkylated aromatic hydrocarbons, lower aliphatic alcohols, acid amides, lactams and aprotic-polar solvents such as ketones, ethers, nitriles, N-substituted acid amides or N-substituted lactams. By 5 contrast, solvents which may optionally be used are polyols containing from 2 to 8 hydroxyl groups and having an OH number above 112 or amine c~talysts of the type also used as component B 5. However, it is preferred not to use a solvent; water in this context is 10 not a solvent.
The optionallv water-containing amine-carbon dioxide adducts which are liquid, but preferably solid, at 20C generally have a) a basic nitrogen content of about 17.5 ~o about 3.5~ by weight, b) a hydroxyl group content of about 23 to about 8.5% by weight, c) A carbon dioxide content of about 37 to about 1.0% by weight and d) a water content of about 3 to about 15% by weight, The following are examples of compounds (B 3.) containing at least one primary, secondary or tertiary hydroxyl group (provided that there are not more primary 25 hydroxyl groups than amino ~roups, preferably at most one primary hydroxyl ~roup although other hydroxyl ~roups may be present and most preferably one hydroxyl group), no primary amino ~roups and at least one secondary amino ~roup which may be used in the pro-30 duction of the carbon dioxide adducts: monoamino- mono-or -dihydroxy compounds containing secondary amino groups such as N-methyl-2-amino-ethanol, N-ethyl-2-aminoethanol and 2-(2-N-methyl-aminoethyl)-1,2-ethane diol. Bis-(hydroxyalkyl)-diamines obtained from corre-35 spondin~ strai~ht-chain or branched-chain aliphatic or Mo-2902 :
~.%'~6~ ~ 9 cycloaliphatic dian~ines by alkoxylation with alkylene oxides, preferably ethylene oxide and/or propylene oxide, are also suitable. Examples include M,N'-bis-(~-hydroxyethyl)-e~hylenediamine~ N,N'-bis-(~-hydroxy-5 propyl~-ethylenediamine, N,N'-bis-(~-hydroxyethyl)~-1,2-propylenediamine, N,N'-bis-(~-hydroxypropyl)-1,3-propane diamine, N,N'-bis-(~-hydroxyethyl)-l-methyl-2,4- and -2,6-diaminocyclohexane, N,N'-bis-(~-hydroxypropyl)-p-xylylene diamine and N-(~-hydroxyethyl)-N'-(~-hydroxy-10 propyl)-ethylenediamine. It is also possible to use alkoxylated tri- and polyamines, for example, tris-(~-hydroxyethyl)-1,6,11-triaminoundecane.
Amines which are solid or liquid at room temperature and preferably used for the production of 15 the optionally water-containing amine-carbon dioxide adducts are those amine compounds which may be obtained a) by reaction of ammonia with 1 mole ethylene or propylene oxide, b) by reaction of Cl-C4-alkylamine with 1 mole ethylene or propylene oxide or c) by reaction of l,2-ethylene or propylene-diamine with 2 moles ethylene oxide or propylene oxide.
Highly preferred amines include N-methyl-2-aminoethanol, N-methyl-2-amino-1-propanol, N-methyl-3-amino-1-propanol and N-e~hyl-2-aminoethanol.
The most preferred amine for the process according to the invention in its preferred embodiment (co-use of 30 trichlorofluoromethane) is N-methyl-2-aminoethanol.
These amines containing hydroxyl groups are con~erted into carbon dioxide adducts by the action of carbon dioxide. So-called carbamates which are ammonium salts of alkylcarbamic acids are formed in the absence 35 of water. If stoichiometric or larger quantities (based Mo-2902 p~
on the amine) of water are used, carbonic acid salts of the particular amine compounds are obtained. In the presence of water in a quantity below the quantity required for complete carbonic acid salt formation, the 5 corresponding mixtures of carbamates and (hydrogen) carbonates are formed. The reaction is carried out in the absence of the following solvents: optionally halogenated aliphatic hydrocarbons, optionally nitrated, halogenated or alkylated aromatic hydrocarbons, lower 10 aliphatic alcohols, aprotic-polar solvents, acid amides and lactams at temperatures of about -25C to tl60C, preferably about 0 to 130C and more preferably 15 to 100C. B~ contrast, solvents which may optionally be used are polyols containing from 2 to 8 hydroxyl groups 15 and having an OH number above 112 or amine catalysts of - the type also used as component B 5., although it is preferred not to use a solvent; water in this context is not a solvent.
The observations made concerning the heat of 20 reaction and the reaction temperature limits to be maintained apply to the production of both the carbamates and the carbonic acid salts. In the case of the carbonic acid salts, however, it is important to remember that the mere combination of amine and water 25 generates considerable heat. The temperatures occurring during the treatment with carbon dioxi~e are on average below those occ~rring in the production o~ the carbamates The carbon dioxide add~lcts are clear, low-30 viscosity liquids o r crysta11ine solids which are generally light in color and stable. They are generally soluble in polar media such as methanol, ethanol, dimethylformamide 9 acetonitrile, dimethylsulfoxide, sul~olan, etc. or in low molecular 35 weight polyols having OH numbers of 200 to 1800 of the Mo-2902 3 ~ ~
~ype ob~airled by addition of ethylene oxide for example onto glycerol or trimethylol propane. However, they are stable in storage, even in the polyol mixture, in quantities of up to about 50% by weight and dissolve 5 clearly to form single-phase solutions of the type used, for example, for the production of rigid polyurethane foam. In the production of cellular polyurethanes in accordance with the invention, they act as blo~ing agent, crosslinking agent and catalyst.
ln The adducts B 3. are used in a quantity of about 0.1 to 30 parts, preferably about 0.15 to 15 parts and more preferably about 0.2 to 2.99 parts, based on 100 parts of B 1. ~ B 2.
The adducts may be produced with any form of 15 carbon dioxide, although unpurified carbon dioxide from steel cylinders is preferably used. In addition, the adducts may be prepared under reduced pressure or excess pressure, but preferably under normal pressure. The temperatures at which they may be prepared ~enerally 20 extend from about -25C to the boiling points of the particular amines, provided they boil below 200C under normal pressure, otherwise to approximately ~160C.
A narrower, preferred range is about 0 to 130C, the range of about 15 to 100C being particularly 25 preferred. In this embodiment, which is preferred, the adducts may be prepared by vigorously introducing carbon dioxide without cooling and without external heating into the amine accommodated in a suitable vessell optionally with a suitable quantity of water add~d. The - 30 reaction generally begins immediately and is accompanied by considerable evolution of heat such that the temperature of the mixture rises quickly to about 40 to 130C. Towards the end of the reaction, there is a distinct reduction in the temperature. In the event of 35 a marked increase in the internal temperature, for ~o-2902 '' ~ . ' . . . ~ .'. -. - ~ .
3,, 2d 7~ 3 ~ 3 example to 100C, caused by exothermic reaction, the reaction vessel is preferably cooled externally in order to counteract secondary reactions (for example cyclization) and discoloration occurring at excessive 5 temperatures.
It is also possible to heat the amine or the amine/water mixture to elevated temperature from the 3utset and only then to introduce CO2. However, it is of no advantage, although possible, to keep the reaction 10 temperatures at -40 to ~40C, as described in DE-OS
1,570,571. In many cases, higher temperatures are even advisable for improving stirability.
The blowing agent (B 5.) used is trichloro-fluoromethane. It is optionally used in quantities up to 50 parts, 15 preferably in quantities of about 0.5 to SO parts, based on 100 parts of B 1.~ B 2.
In addition, amine catalysts (B 4.) are used.
Examples include tertiary amines such as triethylamine, tributylamine, N-methylmorpholine, N-ethylmorpholine, 20 N,N,N',N'-tetramethylethylenediamine, pentamethyl diethylenetriamine and higher homologs (DE-OS 2,624,527 and 2,624,528), 1,4-diazabicyclo-(2,2,2)-octane, N-methyl-N'-dimethylaminoethylpiperazine, bis-(dimethyl-aminoalkyl)-piperazines (DF.-OS 2,636,787), N,N-dimethyl-25 benzylamine, N,N-dime~hylcyclohexylamine, N,N-di-ethylbenzylamine, bis-(N,N-diethylaminoethyl1- adipate, ~,N,N',~'-tetramethyl-1,3-butane diamine, N,N-di-methyl-~-phenylethylamine, 1,2-dimethylimidazole, 2-methylimidazole, monocyclic and bicyclic amidine~
30 (DE-OS 1,720,633), bis-(dialkylamino)-alkylethers (US-PS
3,330,782, DE-AS 1,030,558 and DE-OS 1,804,361 and 2,618,280) and tertiary amines containing amide groups (preferably for~amide groups) according to DE-OS
2,523,633 and 2,732,292). Other suitable catalysts 35 include Mannich bases of secondary amines such as Mo-2902 '' :
- ~,.2,'7$~3 dimethyl~ine; aldehydes, preferably formaldehydes;
ketones such as acetone, methyle~hylketone or cyclo-hexanone; and phenols such as phenol, nonylphenol or bisphenol.
Tertiary amines containing isocyanate-reactive hydrogen atoms suitable for use as catalysts include triethanolamine, triisopropanolamine, N-methyl-diethanolamine, N-ethyldiethanolamine, N,N- dimethyl-ethanolamine, reaction products thereof with alkylene 10 oxides such as propylene oxide and/or ethylene oxide, and also secondary-tertiary amines according to DE-OS
2,732,292:
R R~
~ (CH2)n N-(CH2)n \
N-H N- ( CH2 ) n~NH2 R / R
N-(CH2)n N-(CH2)n R H H R R _ _ H
N-(CH2)m-N-(CH2)m N (CH2)m ~ N-- (CH2)m N _(CH2)m-N-R
R R R k in whi ch the substituents R, indeper.dently of one ano~her, are 30 optionally branched alkyl groups containing fr~m 1 to 4 carbon atoms, the numbers n, independently of one another, are 2 or 3, ; the numbers m, independently of one another, are 2 or 3 and 7.902 ~.~ 7 ~ 3 ~ ~
k is an integer of from 1 to 5, and formulation products and ureidization products thereof.
The fol].owing are examples of the preferred 5 amine catalysts:
O
~(CH2)n-NH-C-H ~
CH -N H-C-N N-(CH2)-NH-C-H
2 ~(CH2) -NH-C-H O ~ O
r~
15 CH3-N~ N~(CH2)n~NH~C~H N-(CH~)3 \
~ N (CH ) /
20 r 1 .
3 N-(cH2)3 ~ N-C~ CH3 U-CH2-N 2 3 CH3 2 3` N-(CH2) / (CH2)3-N
N-(CH2)3 N-(CH2)3 CH ~ N (CH2)3 N~ H
~C-N-(CH2)2-N-(CH2)2-1N-C 3 N-CH2-CH2-CH2-NH-C-NH2 Mo-2902 ., ' :.
.
.
., '' . :
i3~3 o ~N (CH2)3 N ~ H CH -N N-C
r~
CH3-l_(CH2)2-N ~ N-(CH2)2-l (CH2)2 1 3 H
H / CH 2 2 ! 2 2 1 ~ H
N-(CH2)3-N-C-N-(CH2)3-N 3 fH3 ~N- (CH2) -N-(CH ) -NH
H-C
O O H :
N-(CH ) -N CH3~
CH3~ 2 3 ~ H N-(CH2)3-N-C-NH2 Mo-2902 H
, ~- . ' .
.. . .
~ 2763B9 Particularly preferred catalysts are N,N-di-methylaminopropyl formamide and N-methylimidazole.
Other suitable catalysts are silaamines containing carbon-silicon bonds of the type described, 5 for example, in DE-PS 1,2~9,290 (corresponding to US-PS
3,620,984), such as 2,2,4-trimethyl-2-silamorpholine and 1,3~diethylaminomoethyl tetramethyldisiloxane.
Other suit~ble auxiliaries and additives (component C)) which may optionally be used include water and/or additional 10 readily volatile inorganic or organic compounds as additional blowing agents. Organic blowing agents include acetone, ethylidene chloride, ~inylidene chloride, chlorodifluoromethane, dichlorodifluoro-methane. Examples of inorganic blowing agents include 15 air, CO2, or N2O. Further examples of blowing agents and information on the use of blowing agents can be found in Kuns~stoff-Handbuch, Vol. VII, edited by Vieweg and Hochtlen, Carl-Hanser-Verlag, Munich 1966, for example on pages 108 and 109, 453 to 455 and 507 to 510.
Other suitable catalysts are nitrogen-containing bases such as tetraalkylammonium hydroxides;
alkali hydroxides such as sodium hydroxide; alkali phenolates such as sodium phenolate; and alkali alcoholates such as sodium methylate. Hexahydro-25 triazines may also be used as catalysts ~DE-OS
1,769,043).
The reaction between ~CO-~roups and Zere-witinoff-active hydrogen atoms i5 also greatly accelerated by lactams and azalactams, in which case an 30 associate between the lactam and the compound containin~
acidic hydrogen is initially formed. Associates such as these and their catalytic effect are described in DE-OS
2,062,288, 2,062,28g, 2,117,576 (US-PS 3,758,444), 2,129,198, 2,330,175 and 2,330,211.
Mo-2902 . .
.
: :
, ~ 3 ~ ~
According to the invention, organometallic compounds, particularly organotin compounds, may also be used as additional catalysts.
All of the catalysts mentioned above may of 5 course be used in the form of mixtures.
Further representatives of catalysts suitable for use in accordance with the invention and information - on the mode of action of the catalysts can be found in Kunststoff-Handbuch, Vol. VII, edited by Vieweg and 10 Hochtlen, Carl-Hanser-Verlag, Munich 1966~ for example on pages 96 to 102.
The additional catalysts are generally used in a quantity of up to about 10% by weight, preferably about 0.001 to 10~ by weight, based on the total 15 quantity of components B 1. and B 2.
Other auxiliaries and additives which may optionally be used include reaction retarders, for example acid-reacting compounds such as hydrochloric acid or organic acid halides; cell regulators and flame-20 proofing agents; stabilizers against the effects ofaging and weather; plasticizers; fungistatic and bacteriostatic agents; and also fillers.
Further examples of surface-active additives and foam stabilizers, cell regulators, reaction 25 retarders, stabilizers, flameproofing agents, plasticizers, dyes, fillers, fungistatic and bacterio-static agents which may optionally be used in accordance with the invention and information on the use of such additives and their mode of action can be found in 30 Kunststoff Handbuch, Vol. VII, edited by Vieweg and Hochtlen, Carl-Hanser-Verlag, Munich 1966, for example on pages 103 to 113.
The process according to the invention may be carried out as follows. The reaction components are 35 reacted by the one-shot process, the prepolymer process Mo-2902 .
~ 3 ~ ~
or the semiprepolymer process, often using machines, for example the type described i.n US-PS 2,764,565.
Information on processing machines which may also be used in accordance with the invention can be found in 5 Kunststoff-Handbuch, Vol. VII, edited by Vieweg and Hochtlen, Carl-Hanser-Verlag, Munich 1966, for examp].e on pages 121 to 205.
It is also possible in accordance with the invention to produce cold-hardening foams (cf. GB-PS
10 1,162,517, DE-OS 2,153,086).
Foams may of course also be produced by bloc~
foaming or by the laminator process known per se.
According to the invention, the foams are preferably produced by the frothi.ng process, cf. for 15 example Kunststoff-Handbuch, Vol. VII, published by Vieweg and Hochtlen, Carl-Hanser-Verlag, Munich 1966, pages 455, 456, 509, 534).
The polyurethane foams obtainable in accordance with the invention may be flexible, semi-rigid and 20 preferably rigid. They are used, for example, for insulating refrigerators and for the production of sprayed-on insulations and overcoats and as one-component foams.
The invention is further illustrated but is not 25 intended to be limited by the following examples in which all par~s and percentages are by weight unless otherwise specified.
EXAMPLES
30 Formulation:
Polyol component 90 g of a polyether having an OH number of 465 obtained by addition of propylene oxide onto an aqueous sucrose solution, Mo-2902 -2~-3~
10 g of a polyether having an OH number of 650 obtained by addition of propylene oxide onto ethylene-diamine, 2 g of a siloxane-polyether copolymer as foam - 5 stabilizer and 2 g of water.
100 g of this formulation were intensively mixed at room temperature with 4.5 g of a 3:1 mixture of an adduct of CO2 and N-methylethanolamine contair.ing 10%
10 by weight of water and N,N-dimethylaminopropyl formamide, and also 38 g of trichlorofluorome~hane.
This mixture was foamed with 153 g of crude 4,4'-diiso-cyanatodiphenylmethane. A rigld polyurethane foam was formed, showing very few "froth bubbles" by comparison 15 with rigid foams produced with dichlorofluorome~hane.
In addition, the foam showed a very uniform cell pattern, only slight skin formation, good gross density distribution and very good mold filling power.
Foamin~ and physical data:
20 Cream time 0 to 1 sec.
Gel time 90 sec.
Free gross density 21 kg/m3 Cell pattern good to very good.
25 Formula~ion:
Polyol component same as in Example 1 100 g of this formulation were mixed with 3.9 g of a 3:1 mixture of an adduct of N-methylethanolamine and CO2 containing 10Z by weight of water and l-methyl-30 imid~zole, and also 3~ g trichlorotrifluoromethane.This mixture was foamed with 153 g of crude 4,4'-diiso-cyanatodiphenylmethane. A rigid polyurethane foam was formed, showing extremely few l'froth bubbles" compared with rigid polyurethane foams produced with dichlorodi-35 fluoromethane. In addition, the foam showed a very Mo-2902 : . . .
.
.
~.~.'7~
uniform cell pattern, only slight skin formation, good gross density distribution and very good mold filling capacity for a short in-mold time.
Foamin~ and Physical data:
5 Cream time 0 to 1 sec.
Gel time 100 sec.
Free gross density 21 kg/m3 Cell pattern good EXAMPLE 3 (Comparison Example) -10 Formulatior.:
100 parts of the polyol mixture used in Examples 1 and 2 1 part l-methylimidazole and 38 parts of trichlorofluoromethane were mixed and foamed with 153 parts of crude 4,4'-diisocyanatodiphenylmethane.
A non-frothed rigid polyurethane foam showing a surface skin, average gross density distribution and 20 poor mold filling power was formed.
Foaming and physical data:
Cream time 14 sec.
Gel time 115 sec.
Free gross density 23 kg/m3 25 Cell pattern average to poor.
Although the invention has been described in detail in the foregoing for the purpose of illustration, it is to be understood that such detail is solely for that purpose and that variations can be made therein by 30 those skilled in the art without departing from the spirit and scope of the invention except as it ~ay be limited by the claims.
Mo-2902 . .
The follo~7ing materials may be used in the process according to the invention.
Component A includes aliphatic, cycloaliphatic, araliphatic, aromatic and heterocyclic polyisocyanate o the type described, for example, by W. Siefken in 35 Justus Liebigs Annalen der Chemie, 562, pages 75 to 136, for example those corresponding to the formula Mo-2902 .
, ' '. . , : - .
. . - , , ; ~ , , ~ . .' . ~ ~ ." - , .
, . . ~ . . .
~ ' ' ' , , ~ ' ' -~ 3 Q (NCO)n in which n = 2 to 4, preferably 2 and Q is an aliphatic hydrocarbon radical containing 4 to 18, preferably 6 to 10 carbon atoms; a cycloali-phatic hydrocarbon radical containing 4 to 15, preferably 5 to 10 carbon atoms; an aromatic hydrocarbon radical containing 6 to 15, preferably 6 to 13 carbon atoms; or an araliphatic hydrocarbon o radical containing 8 to 15, preferably 8 to 13 carbon atoms.
Examples include 1,6-hexamethylene diisocyanate, 1,12-dodecane diisocyanate, cyclohexane-1,3- and -1,4-diisocyanate and mixtures of these isomers, l-iso-cyanato-3,3,5 trimethyl-5-isocyanatomethylcyclohexane (DE-AS 1,202,785, US-PS 3,401,190), 2,4- and 2,6-hexa-hydrotoluene diisocyanate and mixtures of these isomers, he~ahydro-1,3- and/or -4,4'-diphenylmethane diisocyanate, 1,3- and 1,4-phenylene diisocyanate, 2,4-20 . and 2,6-toluene diisocyanate and mixtures of these isomers, diphenylmethane-2,4'- and/or -4,4'-diisocyanate and naphthylene-1,5-diisocyanate.
Further examples of polyisocyanates which may be used in accordance with ~he in~ention are described in DE-OS 3,312,215, pages 19 to 21 (U.S. Patent 4,500,65~, at column 7~.
Aromatic polyisocyanates are preferably used, particularly preferred are the commercially available polyisocyanates such as 2,~- and 2,6-toluene diisocyanate and mixtures of these isomers ("TDI"), polyphenyl-polymethylene polyisocyanates of the type obtained by phosgenating aniline-formaldehyde Mo-2902 -9-', 1,~ ~ ' -': ' ' ,: , .' ' ~ ~ .
~.2 ~
co~densates ("crude MDI") and polyisocyanates containing carbodiimide groups, urethane groups, allophanate groups, isocyanurate groups, urea groups or biuret groups ("modified polyisocyanates"), particularly those 5 modified polyisocyanates which are derived from 2,4-and/or 2,6- tolylene diisocyanate.
Starting component B l includes compounds containing at least two isocyanate reactive hydrogen atoms and generally ha~ing a molecular weight of from lO about 60 to 1999. These include compounds containing amino groups, thiol groups or carboxyl groups or preferably hydroxyl groups, in particular from 2 to 8 hydroxvl groups, especially those with molecular weights of from about 200 to 1000, preferably from about 300 to 15 800, e.g. polyesters, polyethers, polythioethers, polyacetals, polycarbonates and polyester amides havin~
at least 2, generally 2 ~o 8, preferably 2 ~o 6 hydroxyl groups, such as the known compounds used for the preparation of both homogeneous and cellular 20 polyurethanes. Polyether polyols are particularly pre~erred.
The hydroxypolyethers containing at least 2, generally 2 to 8, preferably 2 to 6 hydroxyl groups, which may also be used according to the invention and 25 are in fact preferred, are kno~n per se and may be prepared, for example, by the polymerization of epoxides such as ethylene oxide, propylene oxide, butylene oxide, tetrahydrofuran, styrene oxide or epichlorohydrin either - on their own, e.g. in the presence of Lewis catalysts 30 such as BF3 or by their che~ical addition, preferably the addition of ethylene oxide and propylene oxide, optionally as mixtures or successively, to starting components containing reactive hydrogen atoms, such as water, alcohols, ammonia or amines, for exa~,ple the 35 following: ethylene glycol, propylene glycol-tl,3) and Mo-2902 , ~' ' ' ' ; , .
. . . .
, ~ 3 ~ ~
(1,2?, trimethylolpropane, glycerol, sorbitol, ~annitol, quinitol, trimethylolethane, pentaerythritol, hexanetriol-(1,2,6), 4,4'-dihydroxy-diphenylpropane, aniline, ethanola~line or ethylene diamine. Sucrose 5 polyethers such as those described, for example, in German Auslegeschriften Nos. 1,176,358 and 1,064,938 flr.d polyethers started on formitol or formose (Ger~an Offenlegungsschriften Nos. 2,639,083 and 2,737,951) may also be used according to the invention. It is 10 frequently pre~erred to use polyethers containing predominantly primary OH groups (up to about 90% by weight thereof, based Oll all of the OH groups in the polyether).
Other suitable compounds are described in 15 detail in DE-OS 3,312,215, pages 21 to 37, (U.S. Pater.t 4,500,656, columns 8-14).
Compounds belonging to component B 2 include polyether polyols obtained from the units described above, provided they have molecular weights of 2000 or 20 greater and polyesters, polybutadienes, polythioethers, polyacetals, polycarbonates, polyester amides and polyamides of known type containing OH, NH andtor SH
groups provided they have molecular weights of 2000 or greater and the other types of compounds mentioned in 25 ~E-OS 3,312,215 (U.S. Patent 4,500,656~ pro~ided the~
have molecular weights above 2000.
Component B 3. includes the amine-carbon dioxide adducts which are liquid, but preferably solid, at 20C ar.d obtained by the action of carbon dioxide on 30 amines, optionallv in the pres~nce of water, at temperatures of about -25C to 160C, preferably about 0 to 130C and most preferably about 15 to 100C. The reaction is conducted in the absence of the following solvents: optionally halogenated, aliphatic 35 hydrocarbons, optionally nitrated, halogenated or Mo-2902 ~ 7~ 3 ~ ~
alkylated aromatic hydrocarbons, lower aliphatic alcohols, acid amides, lactams and aprotic-polar solvents such as ketones, ethers, nitriles, N-substituted acid amides or N-substituted lactams. By 5 contrast, solvents which may optionally be used are polyols containing from 2 to 8 hydroxyl groups and having an OH number above 112 or amine c~talysts of the type also used as component B 5. However, it is preferred not to use a solvent; water in this context is 10 not a solvent.
The optionallv water-containing amine-carbon dioxide adducts which are liquid, but preferably solid, at 20C generally have a) a basic nitrogen content of about 17.5 ~o about 3.5~ by weight, b) a hydroxyl group content of about 23 to about 8.5% by weight, c) A carbon dioxide content of about 37 to about 1.0% by weight and d) a water content of about 3 to about 15% by weight, The following are examples of compounds (B 3.) containing at least one primary, secondary or tertiary hydroxyl group (provided that there are not more primary 25 hydroxyl groups than amino ~roups, preferably at most one primary hydroxyl ~roup although other hydroxyl ~roups may be present and most preferably one hydroxyl group), no primary amino ~roups and at least one secondary amino ~roup which may be used in the pro-30 duction of the carbon dioxide adducts: monoamino- mono-or -dihydroxy compounds containing secondary amino groups such as N-methyl-2-amino-ethanol, N-ethyl-2-aminoethanol and 2-(2-N-methyl-aminoethyl)-1,2-ethane diol. Bis-(hydroxyalkyl)-diamines obtained from corre-35 spondin~ strai~ht-chain or branched-chain aliphatic or Mo-2902 :
~.%'~6~ ~ 9 cycloaliphatic dian~ines by alkoxylation with alkylene oxides, preferably ethylene oxide and/or propylene oxide, are also suitable. Examples include M,N'-bis-(~-hydroxyethyl)-e~hylenediamine~ N,N'-bis-(~-hydroxy-5 propyl~-ethylenediamine, N,N'-bis-(~-hydroxyethyl)~-1,2-propylenediamine, N,N'-bis-(~-hydroxypropyl)-1,3-propane diamine, N,N'-bis-(~-hydroxyethyl)-l-methyl-2,4- and -2,6-diaminocyclohexane, N,N'-bis-(~-hydroxypropyl)-p-xylylene diamine and N-(~-hydroxyethyl)-N'-(~-hydroxy-10 propyl)-ethylenediamine. It is also possible to use alkoxylated tri- and polyamines, for example, tris-(~-hydroxyethyl)-1,6,11-triaminoundecane.
Amines which are solid or liquid at room temperature and preferably used for the production of 15 the optionally water-containing amine-carbon dioxide adducts are those amine compounds which may be obtained a) by reaction of ammonia with 1 mole ethylene or propylene oxide, b) by reaction of Cl-C4-alkylamine with 1 mole ethylene or propylene oxide or c) by reaction of l,2-ethylene or propylene-diamine with 2 moles ethylene oxide or propylene oxide.
Highly preferred amines include N-methyl-2-aminoethanol, N-methyl-2-amino-1-propanol, N-methyl-3-amino-1-propanol and N-e~hyl-2-aminoethanol.
The most preferred amine for the process according to the invention in its preferred embodiment (co-use of 30 trichlorofluoromethane) is N-methyl-2-aminoethanol.
These amines containing hydroxyl groups are con~erted into carbon dioxide adducts by the action of carbon dioxide. So-called carbamates which are ammonium salts of alkylcarbamic acids are formed in the absence 35 of water. If stoichiometric or larger quantities (based Mo-2902 p~
on the amine) of water are used, carbonic acid salts of the particular amine compounds are obtained. In the presence of water in a quantity below the quantity required for complete carbonic acid salt formation, the 5 corresponding mixtures of carbamates and (hydrogen) carbonates are formed. The reaction is carried out in the absence of the following solvents: optionally halogenated aliphatic hydrocarbons, optionally nitrated, halogenated or alkylated aromatic hydrocarbons, lower 10 aliphatic alcohols, aprotic-polar solvents, acid amides and lactams at temperatures of about -25C to tl60C, preferably about 0 to 130C and more preferably 15 to 100C. B~ contrast, solvents which may optionally be used are polyols containing from 2 to 8 hydroxyl groups 15 and having an OH number above 112 or amine catalysts of - the type also used as component B 5., although it is preferred not to use a solvent; water in this context is not a solvent.
The observations made concerning the heat of 20 reaction and the reaction temperature limits to be maintained apply to the production of both the carbamates and the carbonic acid salts. In the case of the carbonic acid salts, however, it is important to remember that the mere combination of amine and water 25 generates considerable heat. The temperatures occurring during the treatment with carbon dioxi~e are on average below those occ~rring in the production o~ the carbamates The carbon dioxide add~lcts are clear, low-30 viscosity liquids o r crysta11ine solids which are generally light in color and stable. They are generally soluble in polar media such as methanol, ethanol, dimethylformamide 9 acetonitrile, dimethylsulfoxide, sul~olan, etc. or in low molecular 35 weight polyols having OH numbers of 200 to 1800 of the Mo-2902 3 ~ ~
~ype ob~airled by addition of ethylene oxide for example onto glycerol or trimethylol propane. However, they are stable in storage, even in the polyol mixture, in quantities of up to about 50% by weight and dissolve 5 clearly to form single-phase solutions of the type used, for example, for the production of rigid polyurethane foam. In the production of cellular polyurethanes in accordance with the invention, they act as blo~ing agent, crosslinking agent and catalyst.
ln The adducts B 3. are used in a quantity of about 0.1 to 30 parts, preferably about 0.15 to 15 parts and more preferably about 0.2 to 2.99 parts, based on 100 parts of B 1. ~ B 2.
The adducts may be produced with any form of 15 carbon dioxide, although unpurified carbon dioxide from steel cylinders is preferably used. In addition, the adducts may be prepared under reduced pressure or excess pressure, but preferably under normal pressure. The temperatures at which they may be prepared ~enerally 20 extend from about -25C to the boiling points of the particular amines, provided they boil below 200C under normal pressure, otherwise to approximately ~160C.
A narrower, preferred range is about 0 to 130C, the range of about 15 to 100C being particularly 25 preferred. In this embodiment, which is preferred, the adducts may be prepared by vigorously introducing carbon dioxide without cooling and without external heating into the amine accommodated in a suitable vessell optionally with a suitable quantity of water add~d. The - 30 reaction generally begins immediately and is accompanied by considerable evolution of heat such that the temperature of the mixture rises quickly to about 40 to 130C. Towards the end of the reaction, there is a distinct reduction in the temperature. In the event of 35 a marked increase in the internal temperature, for ~o-2902 '' ~ . ' . . . ~ .'. -. - ~ .
3,, 2d 7~ 3 ~ 3 example to 100C, caused by exothermic reaction, the reaction vessel is preferably cooled externally in order to counteract secondary reactions (for example cyclization) and discoloration occurring at excessive 5 temperatures.
It is also possible to heat the amine or the amine/water mixture to elevated temperature from the 3utset and only then to introduce CO2. However, it is of no advantage, although possible, to keep the reaction 10 temperatures at -40 to ~40C, as described in DE-OS
1,570,571. In many cases, higher temperatures are even advisable for improving stirability.
The blowing agent (B 5.) used is trichloro-fluoromethane. It is optionally used in quantities up to 50 parts, 15 preferably in quantities of about 0.5 to SO parts, based on 100 parts of B 1.~ B 2.
In addition, amine catalysts (B 4.) are used.
Examples include tertiary amines such as triethylamine, tributylamine, N-methylmorpholine, N-ethylmorpholine, 20 N,N,N',N'-tetramethylethylenediamine, pentamethyl diethylenetriamine and higher homologs (DE-OS 2,624,527 and 2,624,528), 1,4-diazabicyclo-(2,2,2)-octane, N-methyl-N'-dimethylaminoethylpiperazine, bis-(dimethyl-aminoalkyl)-piperazines (DF.-OS 2,636,787), N,N-dimethyl-25 benzylamine, N,N-dime~hylcyclohexylamine, N,N-di-ethylbenzylamine, bis-(N,N-diethylaminoethyl1- adipate, ~,N,N',~'-tetramethyl-1,3-butane diamine, N,N-di-methyl-~-phenylethylamine, 1,2-dimethylimidazole, 2-methylimidazole, monocyclic and bicyclic amidine~
30 (DE-OS 1,720,633), bis-(dialkylamino)-alkylethers (US-PS
3,330,782, DE-AS 1,030,558 and DE-OS 1,804,361 and 2,618,280) and tertiary amines containing amide groups (preferably for~amide groups) according to DE-OS
2,523,633 and 2,732,292). Other suitable catalysts 35 include Mannich bases of secondary amines such as Mo-2902 '' :
- ~,.2,'7$~3 dimethyl~ine; aldehydes, preferably formaldehydes;
ketones such as acetone, methyle~hylketone or cyclo-hexanone; and phenols such as phenol, nonylphenol or bisphenol.
Tertiary amines containing isocyanate-reactive hydrogen atoms suitable for use as catalysts include triethanolamine, triisopropanolamine, N-methyl-diethanolamine, N-ethyldiethanolamine, N,N- dimethyl-ethanolamine, reaction products thereof with alkylene 10 oxides such as propylene oxide and/or ethylene oxide, and also secondary-tertiary amines according to DE-OS
2,732,292:
R R~
~ (CH2)n N-(CH2)n \
N-H N- ( CH2 ) n~NH2 R / R
N-(CH2)n N-(CH2)n R H H R R _ _ H
N-(CH2)m-N-(CH2)m N (CH2)m ~ N-- (CH2)m N _(CH2)m-N-R
R R R k in whi ch the substituents R, indeper.dently of one ano~her, are 30 optionally branched alkyl groups containing fr~m 1 to 4 carbon atoms, the numbers n, independently of one another, are 2 or 3, ; the numbers m, independently of one another, are 2 or 3 and 7.902 ~.~ 7 ~ 3 ~ ~
k is an integer of from 1 to 5, and formulation products and ureidization products thereof.
The fol].owing are examples of the preferred 5 amine catalysts:
O
~(CH2)n-NH-C-H ~
CH -N H-C-N N-(CH2)-NH-C-H
2 ~(CH2) -NH-C-H O ~ O
r~
15 CH3-N~ N~(CH2)n~NH~C~H N-(CH~)3 \
~ N (CH ) /
20 r 1 .
3 N-(cH2)3 ~ N-C~ CH3 U-CH2-N 2 3 CH3 2 3` N-(CH2) / (CH2)3-N
N-(CH2)3 N-(CH2)3 CH ~ N (CH2)3 N~ H
~C-N-(CH2)2-N-(CH2)2-1N-C 3 N-CH2-CH2-CH2-NH-C-NH2 Mo-2902 ., ' :.
.
.
., '' . :
i3~3 o ~N (CH2)3 N ~ H CH -N N-C
r~
CH3-l_(CH2)2-N ~ N-(CH2)2-l (CH2)2 1 3 H
H / CH 2 2 ! 2 2 1 ~ H
N-(CH2)3-N-C-N-(CH2)3-N 3 fH3 ~N- (CH2) -N-(CH ) -NH
H-C
O O H :
N-(CH ) -N CH3~
CH3~ 2 3 ~ H N-(CH2)3-N-C-NH2 Mo-2902 H
, ~- . ' .
.. . .
~ 2763B9 Particularly preferred catalysts are N,N-di-methylaminopropyl formamide and N-methylimidazole.
Other suitable catalysts are silaamines containing carbon-silicon bonds of the type described, 5 for example, in DE-PS 1,2~9,290 (corresponding to US-PS
3,620,984), such as 2,2,4-trimethyl-2-silamorpholine and 1,3~diethylaminomoethyl tetramethyldisiloxane.
Other suit~ble auxiliaries and additives (component C)) which may optionally be used include water and/or additional 10 readily volatile inorganic or organic compounds as additional blowing agents. Organic blowing agents include acetone, ethylidene chloride, ~inylidene chloride, chlorodifluoromethane, dichlorodifluoro-methane. Examples of inorganic blowing agents include 15 air, CO2, or N2O. Further examples of blowing agents and information on the use of blowing agents can be found in Kuns~stoff-Handbuch, Vol. VII, edited by Vieweg and Hochtlen, Carl-Hanser-Verlag, Munich 1966, for example on pages 108 and 109, 453 to 455 and 507 to 510.
Other suitable catalysts are nitrogen-containing bases such as tetraalkylammonium hydroxides;
alkali hydroxides such as sodium hydroxide; alkali phenolates such as sodium phenolate; and alkali alcoholates such as sodium methylate. Hexahydro-25 triazines may also be used as catalysts ~DE-OS
1,769,043).
The reaction between ~CO-~roups and Zere-witinoff-active hydrogen atoms i5 also greatly accelerated by lactams and azalactams, in which case an 30 associate between the lactam and the compound containin~
acidic hydrogen is initially formed. Associates such as these and their catalytic effect are described in DE-OS
2,062,288, 2,062,28g, 2,117,576 (US-PS 3,758,444), 2,129,198, 2,330,175 and 2,330,211.
Mo-2902 . .
.
: :
, ~ 3 ~ ~
According to the invention, organometallic compounds, particularly organotin compounds, may also be used as additional catalysts.
All of the catalysts mentioned above may of 5 course be used in the form of mixtures.
Further representatives of catalysts suitable for use in accordance with the invention and information - on the mode of action of the catalysts can be found in Kunststoff-Handbuch, Vol. VII, edited by Vieweg and 10 Hochtlen, Carl-Hanser-Verlag, Munich 1966~ for example on pages 96 to 102.
The additional catalysts are generally used in a quantity of up to about 10% by weight, preferably about 0.001 to 10~ by weight, based on the total 15 quantity of components B 1. and B 2.
Other auxiliaries and additives which may optionally be used include reaction retarders, for example acid-reacting compounds such as hydrochloric acid or organic acid halides; cell regulators and flame-20 proofing agents; stabilizers against the effects ofaging and weather; plasticizers; fungistatic and bacteriostatic agents; and also fillers.
Further examples of surface-active additives and foam stabilizers, cell regulators, reaction 25 retarders, stabilizers, flameproofing agents, plasticizers, dyes, fillers, fungistatic and bacterio-static agents which may optionally be used in accordance with the invention and information on the use of such additives and their mode of action can be found in 30 Kunststoff Handbuch, Vol. VII, edited by Vieweg and Hochtlen, Carl-Hanser-Verlag, Munich 1966, for example on pages 103 to 113.
The process according to the invention may be carried out as follows. The reaction components are 35 reacted by the one-shot process, the prepolymer process Mo-2902 .
~ 3 ~ ~
or the semiprepolymer process, often using machines, for example the type described i.n US-PS 2,764,565.
Information on processing machines which may also be used in accordance with the invention can be found in 5 Kunststoff-Handbuch, Vol. VII, edited by Vieweg and Hochtlen, Carl-Hanser-Verlag, Munich 1966, for examp].e on pages 121 to 205.
It is also possible in accordance with the invention to produce cold-hardening foams (cf. GB-PS
10 1,162,517, DE-OS 2,153,086).
Foams may of course also be produced by bloc~
foaming or by the laminator process known per se.
According to the invention, the foams are preferably produced by the frothi.ng process, cf. for 15 example Kunststoff-Handbuch, Vol. VII, published by Vieweg and Hochtlen, Carl-Hanser-Verlag, Munich 1966, pages 455, 456, 509, 534).
The polyurethane foams obtainable in accordance with the invention may be flexible, semi-rigid and 20 preferably rigid. They are used, for example, for insulating refrigerators and for the production of sprayed-on insulations and overcoats and as one-component foams.
The invention is further illustrated but is not 25 intended to be limited by the following examples in which all par~s and percentages are by weight unless otherwise specified.
EXAMPLES
30 Formulation:
Polyol component 90 g of a polyether having an OH number of 465 obtained by addition of propylene oxide onto an aqueous sucrose solution, Mo-2902 -2~-3~
10 g of a polyether having an OH number of 650 obtained by addition of propylene oxide onto ethylene-diamine, 2 g of a siloxane-polyether copolymer as foam - 5 stabilizer and 2 g of water.
100 g of this formulation were intensively mixed at room temperature with 4.5 g of a 3:1 mixture of an adduct of CO2 and N-methylethanolamine contair.ing 10%
10 by weight of water and N,N-dimethylaminopropyl formamide, and also 38 g of trichlorofluorome~hane.
This mixture was foamed with 153 g of crude 4,4'-diiso-cyanatodiphenylmethane. A rigld polyurethane foam was formed, showing very few "froth bubbles" by comparison 15 with rigid foams produced with dichlorofluorome~hane.
In addition, the foam showed a very uniform cell pattern, only slight skin formation, good gross density distribution and very good mold filling power.
Foamin~ and physical data:
20 Cream time 0 to 1 sec.
Gel time 90 sec.
Free gross density 21 kg/m3 Cell pattern good to very good.
25 Formula~ion:
Polyol component same as in Example 1 100 g of this formulation were mixed with 3.9 g of a 3:1 mixture of an adduct of N-methylethanolamine and CO2 containing 10Z by weight of water and l-methyl-30 imid~zole, and also 3~ g trichlorotrifluoromethane.This mixture was foamed with 153 g of crude 4,4'-diiso-cyanatodiphenylmethane. A rigid polyurethane foam was formed, showing extremely few l'froth bubbles" compared with rigid polyurethane foams produced with dichlorodi-35 fluoromethane. In addition, the foam showed a very Mo-2902 : . . .
.
.
~.~.'7~
uniform cell pattern, only slight skin formation, good gross density distribution and very good mold filling capacity for a short in-mold time.
Foamin~ and Physical data:
5 Cream time 0 to 1 sec.
Gel time 100 sec.
Free gross density 21 kg/m3 Cell pattern good EXAMPLE 3 (Comparison Example) -10 Formulatior.:
100 parts of the polyol mixture used in Examples 1 and 2 1 part l-methylimidazole and 38 parts of trichlorofluoromethane were mixed and foamed with 153 parts of crude 4,4'-diisocyanatodiphenylmethane.
A non-frothed rigid polyurethane foam showing a surface skin, average gross density distribution and 20 poor mold filling power was formed.
Foaming and physical data:
Cream time 14 sec.
Gel time 115 sec.
Free gross density 23 kg/m3 25 Cell pattern average to poor.
Although the invention has been described in detail in the foregoing for the purpose of illustration, it is to be understood that such detail is solely for that purpose and that variations can be made therein by 30 those skilled in the art without departing from the spirit and scope of the invention except as it ~ay be limited by the claims.
Mo-2902 . .
Claims (12)
1. A process for the production of a cellular polyurethane which comprises reacting:
A) a polyisocyanate with B) an NCO-reactive component comprising 1) a compound containing at least one NCO-reactive group and having a molecular weight of 60 to 1999 and a functionality of 2 to 8,
A) a polyisocyanate with B) an NCO-reactive component comprising 1) a compound containing at least one NCO-reactive group and having a molecular weight of 60 to 1999 and a functionality of 2 to 8,
2) optionally a compound containing at least one NCO-reactive group and having a molecular weight of 2000 to about 12,000 and a functionality of 2 to 8, in the presence of a homogeneous mixture which comprises, based on 100 parts by weight of B 1. + B 2.,
3) about 0.05 to 25 parts by weight of an optionally water-containing adduct of carbon dioxide with an amine containing at least one secondary amino group, no primary amino groups, and at least one primary or secondary hydroxyl group provided there are not more primary hydroxyl groups than amino groups, and
4) about 0.05 to 25 parts by weight of an amine catalyst, and
5) about 0.5 to 50 parts by weight of monofluorotrichloromethane, optionally in the presence of Mo-2902 -25-C) water and/or further inorganic or organic blowing agents, foam stabilizers and other additives usual in the production of cellular polyurethanes.
2. The process of Claim 1 wherein component B 3. is prepared by reacting carbon dioxide with an amine at temperatures of about -25°C to 160°C in the absence of optionally halogenated aliphatic hydrocarbon solvents, optionally nitrated, halogenated or alkylated aromatic hydrocarbon solvent, lower aliphatic alcohol solvents, acid amide solvents, lactam solvents, and aprotic-polar solvents.
3. The process of Claim 1 wherein component B 3. has a) a basic nitrogen content of about 3.5 to 17.5% by weight, b) a hydroxyl group content about 8.5 to 23%
by weight, c) a carbon dioxide content of about 1 to 37%
by weight and d) a water content of 0 to about 15% by weight.
4. The process of Claim 1 wherein said polyisocyanate of component A is based on toluene diisocyanate or a phosgenation product of an aniline-formaldehyde condensate.
5. The process of Claim 1 wherein component B 1. comprises a polyether containing 3 to 6 hydroxyl groups and having a molecular weight of about 200 to 1000 .
2. The process of Claim 1 wherein component B 3. is prepared by reacting carbon dioxide with an amine at temperatures of about -25°C to 160°C in the absence of optionally halogenated aliphatic hydrocarbon solvents, optionally nitrated, halogenated or alkylated aromatic hydrocarbon solvent, lower aliphatic alcohol solvents, acid amide solvents, lactam solvents, and aprotic-polar solvents.
3. The process of Claim 1 wherein component B 3. has a) a basic nitrogen content of about 3.5 to 17.5% by weight, b) a hydroxyl group content about 8.5 to 23%
by weight, c) a carbon dioxide content of about 1 to 37%
by weight and d) a water content of 0 to about 15% by weight.
4. The process of Claim 1 wherein said polyisocyanate of component A is based on toluene diisocyanate or a phosgenation product of an aniline-formaldehyde condensate.
5. The process of Claim 1 wherein component B 1. comprises a polyether containing 3 to 6 hydroxyl groups and having a molecular weight of about 200 to 1000 .
6. The process of Claim 1 wherein the amine used to prepare component B 3. is N-methyl-2-amino-ethanol.
Mo-2902 -26-
Mo-2902 -26-
7. The process of Claim 1 where reaction is carried out by the frothing method.
8. A homogeneous mixture consisting of 3) about 0.05 to 25 parts by weight of an optionally water-containing adduct of carbon dioxide with an amine containing at least one secondary amino group, no primary amino groups and at least one primary or secondary hydroxyl group provided there are not more primary hydroxyl groups than amino groups, 4) about 0.05 to 25 parts by weight of an amine catalyst and 5) about 0.5 to 50 parts by weight of monofluorotrichloromethane.
9. The homogeneous mixture of Claim 8 wherein component B 3. has a) a basic nitrogen content of about 3.5 to 17.5% by weight, b) a hydroxyl group content of about 8.5% to 23% by weight, c) a carbon dioxide content of about 1 to 37%
by weight and d) a water content of 0 to 15% by weight.
by weight and d) a water content of 0 to 15% by weight.
10. The process of Claim 8 wherein the amine used to prepare component B 3. is N-methyl-2-amino-ethanol.
11. The process of Claim 1 wherein said amine contains one secondary amino group and one primary or secondary hydroxyl group.
12. The homogeneous mixture of Claim 8 wherein said amine contains one secondary amino group and one primary or secondary hydroxyl group.
Mo-2902 -27-
Mo-2902 -27-
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19863607964 DE3607964A1 (en) | 1986-03-11 | 1986-03-11 | METHOD FOR PRODUCING A CELLED POLYURETHANE |
| DEP3607964.2 | 1986-03-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1276389C true CA1276389C (en) | 1990-11-13 |
Family
ID=6296000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000531287A Expired - Lifetime CA1276389C (en) | 1986-03-11 | 1987-03-05 | Process for the production of a cellular polyurethane |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4735970A (en) |
| EP (1) | EP0236895A3 (en) |
| JP (1) | JPS62220512A (en) |
| BR (1) | BR8701104A (en) |
| CA (1) | CA1276389C (en) |
| DE (1) | DE3607964A1 (en) |
| DK (1) | DK123087A (en) |
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| DE102011078768A1 (en) | 2011-07-07 | 2013-01-10 | Bayer Materialscience Aktiengesellschaft | Foaming a cavity or an intermediate space comprises filling a reaction mixture comprising a liquid isocyanate component and a liquid component with isocyanate-reactive functional group in the cavity or intermediate space |
| EP2736694B1 (en) | 2011-07-26 | 2019-07-10 | Dow Global Technologies LLC | Method for filling hollow cavities with polymer foam |
| US8720921B1 (en) | 2012-10-30 | 2014-05-13 | SuperSprings International, Inc. | Vehicular suspension enhancement |
| JP6820261B2 (en) * | 2014-12-18 | 2021-01-27 | ルブリゾル アドバンスド マテリアルズ， インコーポレイテッド | Chain extension with its isocyanate to form aqueous polyamide and cationic aqueous polyurea dispersions |
| JP6921505B2 (en) * | 2016-11-25 | 2021-08-18 | コベストロ、ドイチュラント、アクチエンゲゼルシャフトＣｏｖｅｓｔｒｏ Ｄｅｕｔｓｃｈｌａｎｄ Ａｇ | Manufacturing method of open cell rigid polyurethane foam |
| JP6921506B2 (en) * | 2016-11-25 | 2021-08-18 | コベストロ、ドイチュラント、アクチエンゲゼルシャフトＣｏｖｅｓｔｒｏ Ｄｅｕｔｓｃｈｌａｎｄ Ａｇ | Manufacturing method of open cell rigid polyurethane foam |
| CN109679130B (en) * | 2017-10-19 | 2021-09-07 | 山东理工大学 | Composite blowing agent comprising hexafluorobutene and organic alcohol amine salt compound |
| US11745465B2 (en) | 2017-11-28 | 2023-09-05 | Dow Global Technologies Llc | Polyurethane-based insulation board |
| CN111479679A (en) | 2017-11-28 | 2020-07-31 | 陶氏环球技术有限责任公司 | Glass fiber reinforced polyurethane/polyisocyanurate foam thermal insulation board |
| CN116535727A (en) * | 2023-05-23 | 2023-08-04 | 四川大学 | Liquid foaming mixture containing polyester polyol and carbon dioxide adduct |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1570571A1 (en) * | 1965-05-22 | 1969-07-31 | Hoechst Ag | Process for the production of liquid carbaminates |
| AU3752771A (en) * | 1971-01-05 | 1973-07-05 | Dunlop Australia Limited | Cellular polymers |
| JPS51133398A (en) * | 1975-05-15 | 1976-11-19 | Bridgestone Corp | A process for manufacturing fire- retardant low-smoking polyurethane f oam |
| DE3312215A1 (en) * | 1983-04-05 | 1984-10-11 | Bayer Ag, 5090 Leverkusen | METHOD FOR PRODUCING A CELLED POLYURETHANE |
-
1986
- 1986-03-11 DE DE19863607964 patent/DE3607964A1/en not_active Withdrawn
-
1987
- 1987-03-02 US US07/020,622 patent/US4735970A/en not_active Expired - Fee Related
- 1987-03-02 EP EP87102910A patent/EP0236895A3/en not_active Ceased
- 1987-03-05 CA CA000531287A patent/CA1276389C/en not_active Expired - Lifetime
- 1987-03-09 JP JP62052245A patent/JPS62220512A/en active Pending
- 1987-03-10 DK DK123087A patent/DK123087A/en not_active Application Discontinuation
- 1987-03-11 BR BR8701104A patent/BR8701104A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DK123087D0 (en) | 1987-03-10 |
| EP0236895A2 (en) | 1987-09-16 |
| US4735970A (en) | 1988-04-05 |
| DK123087A (en) | 1987-09-12 |
| BR8701104A (en) | 1987-12-29 |
| JPS62220512A (en) | 1987-09-28 |
| EP0236895A3 (en) | 1989-01-04 |
| DE3607964A1 (en) | 1987-09-17 |
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| Date | Code | Title | Description |
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| MKLA | Lapsed |