CA2128684A1 - Low phosphorous, low etch cleaner and method - Google Patents
Low phosphorous, low etch cleaner and methodInfo
- Publication number
- CA2128684A1 CA2128684A1 CA002128684A CA2128684A CA2128684A1 CA 2128684 A1 CA2128684 A1 CA 2128684A1 CA 002128684 A CA002128684 A CA 002128684A CA 2128684 A CA2128684 A CA 2128684A CA 2128684 A1 CA2128684 A1 CA 2128684A1
- Authority
- CA
- Canada
- Prior art keywords
- aluminum
- low
- cleaning
- cleaner
- solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/83—Mixtures of non-ionic with anionic compounds
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/20—Organic compounds containing oxygen
- C11D3/2075—Carboxylic acids-salts thereof
- C11D3/2086—Hydroxy carboxylic acids-salts thereof
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/37—Polymers
- C11D3/3746—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C11D3/3757—(Co)polymerised carboxylic acids, -anhydrides, -esters in solid and liquid compositions
- C11D3/3765—(Co)polymerised carboxylic acids, -anhydrides, -esters in solid and liquid compositions in liquid compositions
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
- C11D7/04—Water-soluble compounds
- C11D7/06—Hydroxides
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/22—Light metals
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/34—Derivatives of acids of phosphorus
- C11D1/345—Phosphates or phosphites
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/72—Ethers of polyoxyalkylene glycols
Abstract
Compositions and methods for cleaning and etching an aluminum surface with a low etch, low phosphate alkaline cleaner solution are dis-closed. The preferred composition employs a stable combination of an alkali metal hydroxide, gluconic acid, a detergent source, an aluminum sequestrant, an oil emulsifier, a defoamer, and a hydrotrope.
Description
o-sos LOW PHOSPHOROUS, LOW ETCH CLEANER AND METHOD
FIELD OF THE INVENTION
The present invention relates to the cleaning of metal surfaces to remove oil, dirt, debris and fine metal particles. More particularly, the 10 present invention relates to alkaline cleaning formulations for aluminum surfaces.
BACKGROUND OF THE INVENTION
Alkaline cleaning treatments are employed in a variety of metal forming and coating processes. Satisfactory treatment of metals requires that any dirt and lubricants from the forming and coating operations be removed. This is particularly necessary in the production of aluminum where cleaning operations to remove oil and debris precede conversion 20 coatings or other coating operations.
212868~
Alkaline and acid cleaners have found wide use in the cleaning of aluminum. Acid etching and cleaning with, for example, hydrofluoric acid gives good results producing clean, mirror bright surfaces. However, the use of acids for cleaning presents safety and effluent disposal problems.
5 Acidic solutions will also attack the cleaning equipment, that is, the tank, pumps and flow lines. This necessitates that this equipment be made of stainless steel. For these reasons, alkaline cleaning and etching proc-esses are favored in the aluminum processing industry.
Many alkaline cleaners are based on phosphate compounds.
These phospllales aid in detergency, sequestration and stabilization.
However, with the advent of growing en~iron,nenlal concerns about phosphates, their use is being reconsidered in cleaning and etching formulations.
With prior art cleaning solutions, the accumulation of oils in the bath presents a three fold problem. First, the presence of oils makes metal cleaning more difficult as the capacity of surfactants to emulsify oil from the metal becomes limited. Second, in alkaline baths, the oils may 20 saponify and thereby contribute to foaming. Lastly, subsequent treatment of the effluent must separate out the emulsified oils prior to discharge.
Higher treatment levels of surfactants are often used to remedy the problems of insufficient cleaning in the presence of oils. This may result in an increase in foam generation and difficulties in breaking the oil/water 25 emulsion prior to the discharge of the effluent.
Virtually any material which is capable of removing oil contamina-tion from an aluminum surface will possibly remove some aluminum. This circumstance coupled with the econo",ic necessity for recycling the cleaner bath c~ ~ses ever increasing amounts of aluminum in the bath.
5 At some point insoluble aluminum compounds will tend to drop out of the cleaning solution in the form of sludge. Such sludge can cause cleaning problems if it redeposits as a film or smut on the aluminum that has just been cleaned.
The inventive composition and Illetilods of using avoid the prob-lems associated with prior processes. The inventive composition offers good cleaning of aluminum and generates a shiny surface while provid-ing low etching of aluminum and avoiding the use of phosphates in the cleaning process.
SUMMARY OF THE INVENTION
The present invention relates to alkaline cleaner compositions and methods for cleaning aluminum surfaces. These alkaline cleaners are 20 particularly effective at cleaning aluminum can end stock without the ad-verse effects of phosphate compounds and with lower aluminum etch.
DESCRIPTION OF THE RELATED ART
An alkaline cleaning and etching process is disclosed in U.S. Pat.
No. 4 477 290 Carroll et al. The low temperature alkaline cleaning and etching solution for aluminum disclosed comprises alkaline metal hydrox-ides and a chelating agent at temperatures of from 80 to 1 30F. No other ingredients such as wetting agents which would cause foaming problems are required.
U.S. Pat. No. 5,114,607, Deck et al., teaches a cleaning and etching solution and method for metal surfaces. This comprises an aqueous alkaline solution of a metal salt of gluconic acid, an alkali tripolyphosphate and a surfactant combination of a low foaming ethylene 5 oxide-propylene oxide block copolymer and a defoaming reverse ethyl-ene oxide-propylene oxide block copolymer.
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides for compositions and methods for cleaning an aluminum surface with a low etch, low phosphate-containing alkaline cleaning solution comprising an alkali metal hydroxide and glu-conic acid, the improvement further comprising an aqueous combination of a detergent, an aluminum sequestrant, an oil emulsifier, a defoamer, 15 and a hydrol(ope.
It has been discovered that this cleaning solution provides good cleaning, high waste treatability and oil splitting ability. This combination provides this cleaning with low aluminum etch, low phosphate content 20 while remaining stable during the cleaning process and generating a shiny aluminum surface. This is important as the cleaner bath will not destabilize, plate out or fail after one application.
The detergent source can be any compound providing detergency 25 while not interfering with the operations of the other components. One such co"",ound is ethoxylated trimethylnonanol which is available from Union Carbide as Tergitol(~)TMN-6.
The aluminum sequestrant is preferably a polymer of acrylic acid, and acts to prevent aluminum fines from redepositing on the aluminum surface. The oil emulsifying surfactant is preferably an anionic surfactant such as potassium alkyl alkoxy alkanoate. One such emulsifier is Mona 5 NF-15 which is available from Mona Industries, Inc.
The defoaming su, ra.:tanl is preferably a reverse ethylene oxide-propylene oxide (EO-PO) block copolymer su, ractanl of the formula (R'O)-(RO)n-(R'O) where R is an ethylene group, R' is a propylene group 10 and n is at least 5 or greater. This defoaming s~" ractanl is available as Pluronic 31-R1 from BASF-Wyandotte. The hydrolrope is preferably one which will increase the aqueous solubility of the surfactants. One such hyd,ol,ope is sodium alkanoate such as l\lol,alrope 1250 available from Mona Industries, Inc.
The processes of the invention comprise contacting the aluminum surfaces to be cleaned with the aqueous cleaning compositions of the invention using any of the conlacting techniques known in the art, such as conventional spray or immersion methods. Spraying is the preferred 20 means of conla.;ting the aluminum surface. Spray times of about 5 to 10 seconds are preferred.
An aqueous solution in accordance with the present invention comprises in volume percent:
In~redient Concer,l, alion KOH 5 to 50%
Gluconic acid 0.5 to 10%
Acrylic acid 0.5 to 10%
Tergitol~) TMN-6 0.2 to 5%
MonaNF-15 0.5to10%
Pluronic 31-R1 0.05 to 5%
hlo"al,ope 1250 0.4 to 20%
The cleaning solutions are effective to clean the aluminum sur-faces at temperatures from about 100 to about 1 50F, preferably 1 30F. The cleaner solution may be diluted to about 1 to 6% in water, preferably 3% prior to use.
Following the cleaning step, the aluminum surfaces can be rinsed with ambient tap water to remove the cleaning solution.
This invention will now be further described with reference to a 20 number of specific examples which are to be regarded solely as illustra-tive, and not as restricting the scope of the invention.
Experimental The evaluation of the inventive cleaner on aluminum is made by tests such as water break free, oil splitting ability, and lacquer perform-ance after prel, ealment.
The prefer,ed aqueous concer,l,dlion in accordance with the pre-sent invention, Cleaner A, is set forth in Table A. This concentrate was employed in the following tests.
TABLE A
Inqredient Concentration KOH (45%) 25.2%
Gluconic acid (50%) 2.0%
Poly(acrylic) acid 1.0%
Tergitol TMN~ 1.0%
Mona NF-15 2.5%
Pluronic 31-R1 0.5%
Monatrope 1250 4.0%
Table I summarizes cleaning efficacy by estimating the percentage of water break free (% WBF) on the surface of aluminum and foaming propensity by estimating foam height. The cleaning process includes 20 spraying on aluminum panel (Kaiser lube and Kaiser 5182 aluminum) with a 3% solution of Cleaner A for 10 seconds at 130F. Rinsing was with tap water for 5 second. These results are reported in Table 1.
TABLE I
Cleaninq Evaluation Oil (%) WBF(%) Foam 0.0 100,100 Low 0.5 100,100,100 Low 1.0 98,100, 95 Low 1.5 95, 90, 90 Low 2.0 80, 85, 90 Low Table ll reports a co",pardlive test for aluminum etch rate between the inventive composition and a phosphate-containing cleaner solution.
The comparative cleaner is an alkali cleaning solution commercially available as Betz DC-1675, available from Betz Laboratories, Inc., 5 Trevose, PA.
TABLE ll Etch Rate Etch Rate Cleaner Conc. (%) TemP. (F) (mq.ffl2/s) DC-1675 3.0 130 1.2 Cleaner A 3.0 130 0.9 Tables lll and IV report the results of waste treatability of the in-ventive composition versus Betz DC-1675. Waste treatability is the 20 measure",enl of turbidity and clarity of an oil-loaded cleaner bath after acidification to pH 2. The lower the turbidity and the higher the clarity, the better waste t, eatability the cleaner has. Oil-splitting ability was judged by observing phase separation of 2% oil-loaded bath.
212~684 TABLE lll Waste TreatabilitY and Oil-Splittin~ Ability Kaiser Lube Cleaner ClaritY TurbiditYOil SPlittin~ (?) -3% Cleaner A 30 ml 226 ftu No 3% DC-1675 25 ml 306 ftu No TABLE IV
Reynoids Oil Cleaner ClaritY TurbiditY Oil SPlittin~ (?) 3% Cleaner A 38 ml 132 ftu Yes within 30 min.
3% DC-1675 ---- ------ Yes within 30 min.
As seen in Table lll the inventive composition represented by Cleaner A proved as effective as the phosphate-based cleaner at waste treatability. As seen in Table IV the inventive low-phosphate composi-tion was as effective as the co"""ercial cleaner at oil splitting.
Kaiser 5182 aluminum was spray-cleaned in 3% cleaner bath for 10 seconds at 1 30F followed by a tap water rinse. The panels were deoxidized with 5% DH-1519 a commercial deoxidizer available from Betz Laboratories Inc.. After spray-applying 5% of Betz DC-1903 an 5 aluminum ~ret,eal",ent from Bek Laboratories for 5 seconds at 90F
clear and white lacquers were draw-down applied and cured accordi"g to manufacturer's specifications. Tables V and Vl summarize the test re-sults of the inventive composition versus a phosphate-containing alkaline - cleaner.
TABLE V
Valspar Vinyl Resin LACTIC ACID DOWFAX
Deox HCI
Cleaner (?) XHDimPle XHFea. Blush Blister DC-1675 No 5B 10 5B 9.9 None 7 Cleaner A No 4B 10 5B10.0 None 7 DC-1675 Yes 5B 10 5B9.85 None -8 Cleaner A Yes 4B 10 5B9.75 None 6 11 212~6~
TABLE Vl Valspar Pigmented Resin WHITE LACQUER PERFORMANCE
Deox AUTOCLAVE HCI
Cleaner _ (?) XH Nickel Blister DC-1675 No . 5B Fail 10 Cleaner A No 5B Fail 10 DC-1675 Yes 5B Fail 10 Cleaner A Yes 5B Fail 10 These results indicate that the inventive composition is as effective a cleaner as a known, phosphate-based commercial aluminum cleaner.
While this invention has been described with respect to particular embodiments thereof, it is apparent that numerous other forms and modi-fications of this invention will be obvious to those skilled in the art. The appended claims and this invention generally should be construed to cover all such obvious form and modifications which are within the true spirit and scope of the present invention.
FIELD OF THE INVENTION
The present invention relates to the cleaning of metal surfaces to remove oil, dirt, debris and fine metal particles. More particularly, the 10 present invention relates to alkaline cleaning formulations for aluminum surfaces.
BACKGROUND OF THE INVENTION
Alkaline cleaning treatments are employed in a variety of metal forming and coating processes. Satisfactory treatment of metals requires that any dirt and lubricants from the forming and coating operations be removed. This is particularly necessary in the production of aluminum where cleaning operations to remove oil and debris precede conversion 20 coatings or other coating operations.
212868~
Alkaline and acid cleaners have found wide use in the cleaning of aluminum. Acid etching and cleaning with, for example, hydrofluoric acid gives good results producing clean, mirror bright surfaces. However, the use of acids for cleaning presents safety and effluent disposal problems.
5 Acidic solutions will also attack the cleaning equipment, that is, the tank, pumps and flow lines. This necessitates that this equipment be made of stainless steel. For these reasons, alkaline cleaning and etching proc-esses are favored in the aluminum processing industry.
Many alkaline cleaners are based on phosphate compounds.
These phospllales aid in detergency, sequestration and stabilization.
However, with the advent of growing en~iron,nenlal concerns about phosphates, their use is being reconsidered in cleaning and etching formulations.
With prior art cleaning solutions, the accumulation of oils in the bath presents a three fold problem. First, the presence of oils makes metal cleaning more difficult as the capacity of surfactants to emulsify oil from the metal becomes limited. Second, in alkaline baths, the oils may 20 saponify and thereby contribute to foaming. Lastly, subsequent treatment of the effluent must separate out the emulsified oils prior to discharge.
Higher treatment levels of surfactants are often used to remedy the problems of insufficient cleaning in the presence of oils. This may result in an increase in foam generation and difficulties in breaking the oil/water 25 emulsion prior to the discharge of the effluent.
Virtually any material which is capable of removing oil contamina-tion from an aluminum surface will possibly remove some aluminum. This circumstance coupled with the econo",ic necessity for recycling the cleaner bath c~ ~ses ever increasing amounts of aluminum in the bath.
5 At some point insoluble aluminum compounds will tend to drop out of the cleaning solution in the form of sludge. Such sludge can cause cleaning problems if it redeposits as a film or smut on the aluminum that has just been cleaned.
The inventive composition and Illetilods of using avoid the prob-lems associated with prior processes. The inventive composition offers good cleaning of aluminum and generates a shiny surface while provid-ing low etching of aluminum and avoiding the use of phosphates in the cleaning process.
SUMMARY OF THE INVENTION
The present invention relates to alkaline cleaner compositions and methods for cleaning aluminum surfaces. These alkaline cleaners are 20 particularly effective at cleaning aluminum can end stock without the ad-verse effects of phosphate compounds and with lower aluminum etch.
DESCRIPTION OF THE RELATED ART
An alkaline cleaning and etching process is disclosed in U.S. Pat.
No. 4 477 290 Carroll et al. The low temperature alkaline cleaning and etching solution for aluminum disclosed comprises alkaline metal hydrox-ides and a chelating agent at temperatures of from 80 to 1 30F. No other ingredients such as wetting agents which would cause foaming problems are required.
U.S. Pat. No. 5,114,607, Deck et al., teaches a cleaning and etching solution and method for metal surfaces. This comprises an aqueous alkaline solution of a metal salt of gluconic acid, an alkali tripolyphosphate and a surfactant combination of a low foaming ethylene 5 oxide-propylene oxide block copolymer and a defoaming reverse ethyl-ene oxide-propylene oxide block copolymer.
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides for compositions and methods for cleaning an aluminum surface with a low etch, low phosphate-containing alkaline cleaning solution comprising an alkali metal hydroxide and glu-conic acid, the improvement further comprising an aqueous combination of a detergent, an aluminum sequestrant, an oil emulsifier, a defoamer, 15 and a hydrol(ope.
It has been discovered that this cleaning solution provides good cleaning, high waste treatability and oil splitting ability. This combination provides this cleaning with low aluminum etch, low phosphate content 20 while remaining stable during the cleaning process and generating a shiny aluminum surface. This is important as the cleaner bath will not destabilize, plate out or fail after one application.
The detergent source can be any compound providing detergency 25 while not interfering with the operations of the other components. One such co"",ound is ethoxylated trimethylnonanol which is available from Union Carbide as Tergitol(~)TMN-6.
The aluminum sequestrant is preferably a polymer of acrylic acid, and acts to prevent aluminum fines from redepositing on the aluminum surface. The oil emulsifying surfactant is preferably an anionic surfactant such as potassium alkyl alkoxy alkanoate. One such emulsifier is Mona 5 NF-15 which is available from Mona Industries, Inc.
The defoaming su, ra.:tanl is preferably a reverse ethylene oxide-propylene oxide (EO-PO) block copolymer su, ractanl of the formula (R'O)-(RO)n-(R'O) where R is an ethylene group, R' is a propylene group 10 and n is at least 5 or greater. This defoaming s~" ractanl is available as Pluronic 31-R1 from BASF-Wyandotte. The hydrolrope is preferably one which will increase the aqueous solubility of the surfactants. One such hyd,ol,ope is sodium alkanoate such as l\lol,alrope 1250 available from Mona Industries, Inc.
The processes of the invention comprise contacting the aluminum surfaces to be cleaned with the aqueous cleaning compositions of the invention using any of the conlacting techniques known in the art, such as conventional spray or immersion methods. Spraying is the preferred 20 means of conla.;ting the aluminum surface. Spray times of about 5 to 10 seconds are preferred.
An aqueous solution in accordance with the present invention comprises in volume percent:
In~redient Concer,l, alion KOH 5 to 50%
Gluconic acid 0.5 to 10%
Acrylic acid 0.5 to 10%
Tergitol~) TMN-6 0.2 to 5%
MonaNF-15 0.5to10%
Pluronic 31-R1 0.05 to 5%
hlo"al,ope 1250 0.4 to 20%
The cleaning solutions are effective to clean the aluminum sur-faces at temperatures from about 100 to about 1 50F, preferably 1 30F. The cleaner solution may be diluted to about 1 to 6% in water, preferably 3% prior to use.
Following the cleaning step, the aluminum surfaces can be rinsed with ambient tap water to remove the cleaning solution.
This invention will now be further described with reference to a 20 number of specific examples which are to be regarded solely as illustra-tive, and not as restricting the scope of the invention.
Experimental The evaluation of the inventive cleaner on aluminum is made by tests such as water break free, oil splitting ability, and lacquer perform-ance after prel, ealment.
The prefer,ed aqueous concer,l,dlion in accordance with the pre-sent invention, Cleaner A, is set forth in Table A. This concentrate was employed in the following tests.
TABLE A
Inqredient Concentration KOH (45%) 25.2%
Gluconic acid (50%) 2.0%
Poly(acrylic) acid 1.0%
Tergitol TMN~ 1.0%
Mona NF-15 2.5%
Pluronic 31-R1 0.5%
Monatrope 1250 4.0%
Table I summarizes cleaning efficacy by estimating the percentage of water break free (% WBF) on the surface of aluminum and foaming propensity by estimating foam height. The cleaning process includes 20 spraying on aluminum panel (Kaiser lube and Kaiser 5182 aluminum) with a 3% solution of Cleaner A for 10 seconds at 130F. Rinsing was with tap water for 5 second. These results are reported in Table 1.
TABLE I
Cleaninq Evaluation Oil (%) WBF(%) Foam 0.0 100,100 Low 0.5 100,100,100 Low 1.0 98,100, 95 Low 1.5 95, 90, 90 Low 2.0 80, 85, 90 Low Table ll reports a co",pardlive test for aluminum etch rate between the inventive composition and a phosphate-containing cleaner solution.
The comparative cleaner is an alkali cleaning solution commercially available as Betz DC-1675, available from Betz Laboratories, Inc., 5 Trevose, PA.
TABLE ll Etch Rate Etch Rate Cleaner Conc. (%) TemP. (F) (mq.ffl2/s) DC-1675 3.0 130 1.2 Cleaner A 3.0 130 0.9 Tables lll and IV report the results of waste treatability of the in-ventive composition versus Betz DC-1675. Waste treatability is the 20 measure",enl of turbidity and clarity of an oil-loaded cleaner bath after acidification to pH 2. The lower the turbidity and the higher the clarity, the better waste t, eatability the cleaner has. Oil-splitting ability was judged by observing phase separation of 2% oil-loaded bath.
212~684 TABLE lll Waste TreatabilitY and Oil-Splittin~ Ability Kaiser Lube Cleaner ClaritY TurbiditYOil SPlittin~ (?) -3% Cleaner A 30 ml 226 ftu No 3% DC-1675 25 ml 306 ftu No TABLE IV
Reynoids Oil Cleaner ClaritY TurbiditY Oil SPlittin~ (?) 3% Cleaner A 38 ml 132 ftu Yes within 30 min.
3% DC-1675 ---- ------ Yes within 30 min.
As seen in Table lll the inventive composition represented by Cleaner A proved as effective as the phosphate-based cleaner at waste treatability. As seen in Table IV the inventive low-phosphate composi-tion was as effective as the co"""ercial cleaner at oil splitting.
Kaiser 5182 aluminum was spray-cleaned in 3% cleaner bath for 10 seconds at 1 30F followed by a tap water rinse. The panels were deoxidized with 5% DH-1519 a commercial deoxidizer available from Betz Laboratories Inc.. After spray-applying 5% of Betz DC-1903 an 5 aluminum ~ret,eal",ent from Bek Laboratories for 5 seconds at 90F
clear and white lacquers were draw-down applied and cured accordi"g to manufacturer's specifications. Tables V and Vl summarize the test re-sults of the inventive composition versus a phosphate-containing alkaline - cleaner.
TABLE V
Valspar Vinyl Resin LACTIC ACID DOWFAX
Deox HCI
Cleaner (?) XHDimPle XHFea. Blush Blister DC-1675 No 5B 10 5B 9.9 None 7 Cleaner A No 4B 10 5B10.0 None 7 DC-1675 Yes 5B 10 5B9.85 None -8 Cleaner A Yes 4B 10 5B9.75 None 6 11 212~6~
TABLE Vl Valspar Pigmented Resin WHITE LACQUER PERFORMANCE
Deox AUTOCLAVE HCI
Cleaner _ (?) XH Nickel Blister DC-1675 No . 5B Fail 10 Cleaner A No 5B Fail 10 DC-1675 Yes 5B Fail 10 Cleaner A Yes 5B Fail 10 These results indicate that the inventive composition is as effective a cleaner as a known, phosphate-based commercial aluminum cleaner.
While this invention has been described with respect to particular embodiments thereof, it is apparent that numerous other forms and modi-fications of this invention will be obvious to those skilled in the art. The appended claims and this invention generally should be construed to cover all such obvious form and modifications which are within the true spirit and scope of the present invention.
Claims (13)
1. A low etch, low phosphate containing aluminum cleaning composition including an aqueous solution of an alkali metal hydroxide and gluconic acid, the improvement further comprising a stable combi-nation of a detergent, an aluminum sequestrant, an oil emulsifier, a de-foamer, and a hydrotrope.
2. The composition as claimed in claim 1 wherein said alkali metal hydroxide is potassium hydroxide.
3. The composition as claimed in claim 1 wherein said stable combination comprises ethoxylated trimethylnonanol, poly(acrylic) acid, potassium alkyl alkoxy alkanoate, a reverse ethylene oxide - propylene oxide block copolymer and sodium alkanoate.
4. A method for cleaning and etching an aluminum surface with a low aluminum etch, low phosphate-containing alkaline cleaning solution comprising an alkali metal hydroxide and gluconic acid, the im-provement further comprising a stable combination of a detergent, an aluminum sequestrant, an oil emulsifier, a defoamer, and a hydrotrope.
5. The method as claimed in claim 4 wherein said alkali metal hydroxide is potassium hydroxide.
6. The method as claimed in claim 4 wherein said detergent is ethoxylated trimethylnonanol.
7. The method as claimed in claim 4 wherein said aluminum sequestrant is poly(acrylic) acid.
8. The method as claimed in claim 4 wherein said oil emulsifier is potassium alkyl alkoxy alkanoate.
9. The method as claimed in claim 4 wherein said defoamer is a reverse ethylene oxide-propylene oxide block copolymer.
10. The method as claimed in claim 4 wherein said hydrotrope is sodium alkanoate.
11. The method as claimed in claim 4 wherein said solution is sprayed onto the aluminum surface.
12. The method as claimed in claim 4 wherein said solution is sprayed onto the aluminum surfaces at a temperature of about 100°F to about 150°F.
13. The method as claimed in claim 4 wherein said solution is diluted to about 1 to 6% in water.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/217,040 | 1994-03-24 | ||
| US08/217,040 US5472630A (en) | 1994-03-24 | 1994-03-24 | Low phosphorous, low etch cleaner and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2128684A1 true CA2128684A1 (en) | 1995-09-25 |
Family
ID=22809445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002128684A Abandoned CA2128684A1 (en) | 1994-03-24 | 1994-07-22 | Low phosphorous, low etch cleaner and method |
Country Status (2)
| Country | Link |
|---|---|
| US (2) | US5472630A (en) |
| CA (1) | CA2128684A1 (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6106633A (en) * | 1996-04-09 | 2000-08-22 | Diversey Lever, Inc. | Method of preventing damage to bottle labels and composition thereof |
| JP3307952B2 (en) * | 1996-04-09 | 2002-07-29 | ユニリーバー・ナームローゼ・ベンノートシヤープ | Anti-etching bottle cleaning solution |
| JP3507628B2 (en) * | 1996-08-06 | 2004-03-15 | 昭和電工株式会社 | Polishing composition for chemical mechanical polishing |
| JP4303365B2 (en) * | 1998-07-30 | 2009-07-29 | 日本ペイント株式会社 | Cleaning aqueous solution of aluminum metal and cleaning method thereof |
| US6197736B1 (en) | 1998-12-22 | 2001-03-06 | The Boeing Company | Alkaline cleaning solution |
| JP2001152375A (en) | 1999-11-05 | 2001-06-05 | Nippon Parkerizing Co Ltd | Cleaning method for hard surface and composition used therefor |
| DE10002710A1 (en) * | 2000-01-22 | 2001-08-02 | Henkel Ecolab Gmbh & Co Ohg | Production of creamy alkaline-aqueous cleaning agents containing complexing agents |
| US6240935B1 (en) | 2000-03-30 | 2001-06-05 | The Boeing Company | Boelube R dissolving alkaline cleaning solution |
| US6489281B1 (en) | 2000-09-12 | 2002-12-03 | Ecolab Inc. | Cleaning composition comprising inorganic acids, an oxidant, and a cationic surfactant |
| US6559112B2 (en) * | 2001-01-30 | 2003-05-06 | Johnsondiversey, Inc. | Neutral cleaning composition with moderate and low foaming surfactants |
| CA2525205C (en) | 2004-11-08 | 2013-06-25 | Ecolab Inc. | Foam cleaning and brightening composition, and methods |
| EP3293493B1 (en) | 2008-06-04 | 2023-06-14 | Jp Laboratories, Inc. | Sterilization indicating device |
| US9562834B2 (en) | 2014-08-21 | 2017-02-07 | John J. Nelson | Aqueous compositions and methods of using the same for histopathological evaluation of tissue samples |
| AU2016335680B2 (en) | 2015-10-07 | 2020-03-05 | Elementis Specialties, Inc. | Wetting and anti-foaming agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT292408B (en) * | 1968-09-02 | 1971-08-25 | Henkel & Cie Gmbh | Procedure for cleaning aluminum surfaces before painting |
| DE1907206A1 (en) * | 1969-02-13 | 1970-09-17 | Metallgesellschaft Ag | Process for cleaning metal surfaces |
| US4085060A (en) * | 1975-09-23 | 1978-04-18 | Vassileff Neiko I | Sequestering compositions |
| JPS5921956B2 (en) * | 1976-10-07 | 1984-05-23 | 日産自動車株式会社 | Metal surface cleaning composition |
| US4477290A (en) * | 1983-01-10 | 1984-10-16 | Pennwalt Corporation | Cleaning and etching process for aluminum containers |
| JPS60260698A (en) * | 1984-06-07 | 1985-12-23 | 栗田工業株式会社 | Cleaning agent for neutralization |
| US4762638A (en) * | 1986-04-23 | 1988-08-09 | Amchem Products, Inc. | Alkaline cleaner for aluminum |
| US5342450A (en) * | 1989-01-26 | 1994-08-30 | Kay Chemical Company | Use of noncorrosive chemical composition for the removal of soils originating from an animal or vegetable source from a stainless steel surface |
| US5114607A (en) * | 1990-08-08 | 1992-05-19 | Betz Laboratories, Inc. | Low foaming alkaline cleaner comprising a surfactant mixture of an EO-PO-EO block copolymer and a PO-ZO-PO block copolymer |
| US5200114A (en) * | 1990-08-24 | 1993-04-06 | Man-Gill Chemical Company | Alkaline cleaner for reducing stain on aluminum surfaces |
| US5110494A (en) * | 1990-08-24 | 1992-05-05 | Man-Gill Chemical Company | Alkaline cleaner and process for reducing stain on aluminum surfaces |
| JPH04187788A (en) * | 1990-11-20 | 1992-07-06 | Nippon Parkerizing Co Ltd | Method for washing aluminum or aluminum alloy |
| US5391234A (en) * | 1991-08-05 | 1995-02-21 | Henkel Corporation | Cleaning or stripping composition and method |
| JP2778863B2 (en) * | 1991-11-06 | 1998-07-23 | 日本ペイント株式会社 | Degreasing cleaning method |
| JP2884027B2 (en) * | 1992-05-20 | 1999-04-19 | 花王株式会社 | Metal detergent additive and metal detergent composition containing the same |
| US5380468A (en) * | 1992-10-20 | 1995-01-10 | Man-Gill Chemical Company | Aqueous alkaline composition for cleaning aluminum and tin surfaces |
-
1994
- 1994-03-24 US US08/217,040 patent/US5472630A/en not_active Expired - Fee Related
- 1994-07-22 CA CA002128684A patent/CA2128684A1/en not_active Abandoned
-
1995
- 1995-07-18 US US08/503,665 patent/US5545347A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US5545347A (en) | 1996-08-13 |
| US5472630A (en) | 1995-12-05 |
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Legal Events
| Date | Code | Title | Description |
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| FZDE | Discontinued |