Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS2169700 A
Publication typeGrant
Publication dateAug 15, 1939
Filing dateNov 2, 1936
Priority dateNov 2, 1936
Publication numberUS 2169700 A, US 2169700A, US-A-2169700, US2169700 A, US2169700A
InventorsClarence M Loane, Bernard H Shoemaker
Original AssigneeStandard Oil Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Lubricant
US 2169700 A
Images(3)
Previous page
Next page
Description  (OCR text may contain errors)

Patented Aug. 15, 1939 oric LUBRICANT Clarence M. Loane, Whiting, and Bernard H.

Shoemaker,

Hammond, Ind.,

assignors to Standard Oil Company, Chicago, 111., a corporation of Indiana No Drawing. Application November 2, 1936,

Serial No. 108,833 g 1 17 Claims.

This invention relates to lubricants and, in particular, to addition agents imparting to lubricants improved properties.

Our invention has particular utilityin preventing and/or inhibiting the corrosion of hard metal alloy bearings such as copper-lead, cadmium- -nickel, and cadmium-silver bearings which, to a large extent, have replaced soft metal bearings such as Babbitt metal in the trend toward inthe range of S. A. E. 10 oils, and which have been subjected to such refining processes such as, for

example, solvent extraction, that the paraffinicity of the oil is markedly increased. It has been found that highly refined lubricating oils cause corrosion to alloy bearings of the cadmium-silver type to the extent of 5 mg/cmi and even greater when such bearings are submerged for hours or less in an air agitated oil which has been preoxidized at about 340 F. for 25 to 50 hours. .The motor oils may be highly refined lubricating oils as such or mixtures of highly refined lubricating oils with less highly refined lubricating oils, or stated in another way, mixtures of corrosive oils and non-corrosive oils, examples of the latter being lubricating oilfractions from Winkler crude or crudes of the Winkler type.

We have found that corrosion of hard metal alloy bearings can be inhibited and highly desirable properties can be imparted to the lubricating oil by adding thereto up to 2% but preferably 0.05% to 0.75% of certain organic materials, particularly the aliphatic and aromatic poly thiocyanates and the aliphatic and aromatic poly isothiocyanates having the general formulas aromatic group and n is a wholenumber greater than one.

Examples of the poly thiocyanates which we may use are:

Dithiocyano ethane Dithiocyano propane Dithiocyano butane Dithiocyano heptane Trithiocyano heptane Dithiocyano octane Trithiocyano octane Dithiocyano dodecane 1,2,4 trithiocyano benzene Para phenylene dithiocyanate Ortho phenylene dithiocyanate Meta phenylene dithiocyanate Examples of the poly isothiocyanates which may be used are:

Di isothiocyano propane Di isothiocyano butane Di isothiocyano heptane Tri isothiocyano heptane Ocetene di isothiocyanate Tri isothiocyano octane Dodecene di isothiocyanate 1,2,4 tri isothiocyano benzene Para phenylene di isothiocyanate Ortho phenylene. di isothiocyanate Meta phenylene di isothiocyanate Our invention also contemplates the use of the polymers obtained by heating mustard oil with an aqueous solution of potassium acetate, or by heating mustard oil with dilute hydrochloric acid.

We have also found that certain metallo poly thiocyanates may be used effectively. Compounds: such as potassium ferri thiocyanate and ammonium ferri thiocyanate are examples of the type of metallo poly thiocyanates we prefer to use. The metallo poly thiocyanates are best dissolved in the oil by adding, for example, KSCN to a slightly acidified FeCla solution and extracting the aqueous solution with ether. The ether extract by blowing. Since these compounds impart color to the oil they are preferably used where discoloration of the oil is not detrimental to its use.

Since these compounds are subjected to high temperature conditions it is highly desirable that the compound of the aforementioned type having boiling points of about 400 F. or greater be used. The eifectiveness of compounds of the above is then added to the oil and the ether removed type as corrosion inhibitors is demonstrated by the following test in which they were subjected to a set of conditions, which is more severe than those encountered in the actual operation of internal combustion engines. The compounds were tested by the following method.

The weighed bearings are placed in a highly refined oil containing the inhibitor which is air agitated at about 341 F. At periodic intervals the bearings are removed from the oil bath, washed free of oil and the loss in weight determined. Each time before being replaced in the oil bath the bearings are polished bright and reweighed and again tested for predetermined periods.

In the above test the oil used was a motor oil refined to such an extent that a loss in weight of more than 5 mg. per cm. is obtained in 25 hours or less on a cadmium-silver alloy bearing submerged in an air agitated oil at 340 F., which oil has been preoxidized for 25-50 hours at about 340 F.

Using the above described test the following results were obtained.

Periods on 1st 2nd 8rd 4th 5th 2,4 hrs. 6 hrs. 16 hrs. 0 hrs. 16 hrs.

Loss in rug/cm Control 3. 6 5. 0 20. 5 .2% ethylene dithiocyanate 0.9 0.0 2.9 11.0 2% dodecene dithiocyanate 0.0 0.0 0. 7 1. 3 2G. 5 .2% octene dithiocyanate 0. 1 0. 0 0.9 6.6 Mustard oil potassium acetate polymer 0.0 0. 0 0.0 0. 0 0. 0 Mustard oil H01 powmer 0. 0 0. 0 0. 0 0. 0 0. 0 3% QKSON-Fe (SCNh. 0.1 1.1 3.6 1.0 .2% 1(NH4SCN) Fe (SCNh... 0.5 1.2 2. 5 0.9

While we have described in detail the use of the hereinbefore mentioned compounds as corrosion inhibitors in highly refined lubricating oils, our invention is not limited thereto, but contemplates the use of up to 10% of these compounds in lubricating oils for the purpose of improving the film strength thereof, reduce engine wear and to impart to lubricants improved extreme pressure characteristics. These compounds may also be used to improve the lubricity and other properties of lubricating oils.

Some of the foregoing compounds may not be completely soluble in tire lubricant, in which case effective results are obtained by suspending the inhibitor in the lubricant by means of a small amount of a peptizing agent such as aluminum naphthenate, aluminum stearate, etc.

We do not limit ourselves to the specific embodiments of our invention herein described except as defined by the appended claims.

We claim:

1. An improved extreme pressure lubricant comprising a mineral lubricating oil and from about 0.05% to about 10% of an organic compound having the general formula R(Y)n in which R is a substituent selected from the group consisting of an aliphatic group, an aromatic group and a metal, Y is a radical selected from the group consisting of a thiocyano radical and an isothiocyano radical and n is a whole number greater than 1.

2. An improved extreme pressure lubricant comprising a mineral lubricating oil and from about 0.05% to about 10% of a polythiocyanate having the general formula R(SCN) in which R is a. substituent selected from the group consisting of an aliphatic group, an aromatic group and a'metal and n is a whole number greater than one.

3. An improved extreme pressure lubricant comprising a mineral lubricating oil and from about 0.05% to about 10% of a polyisothiocyanate having the general formula RkNCSM in which R is a substituent selected from "he group consisting of an aliphatic group, an a10- matic group and a metal and n is a whole number greater than one.

4. An improved extreme pressure' lubricant comprising mineral lubricating oil and a polythiocyanate having the general formula RtSCN) n in which R. is an aliphatic group and n is a whole number greater than 1, said aliphatic polythiocyanate being added in amounts suflicient to impart extreme pressure properties to said lubricating oil.

5. An improved extreme pressure lubricz nt comprising a mineral lubricating oil and from about 0.05% to about 10% dodec'ene dithiocyanate.

6. An improved extreme pressure lubricant comprising a mineral lubricating oil and from about 0.05% to about 10% octene dithiocyanate.

7. An improved extreme pressure lubricant comprising mineral lubricating oil and a polythiocyanate having the general formula R(SCN)1. in which R. is an aromatic group and 11. is a whole number greater than 1, said aromatic polythiocyanate being added in amounts suflicient to impart extreme pressure properties to said lubricating oil.

8. An improved extreme pressure lubricant comprising a mineral lubricating oil and an aliphatic polyisothiocyanate having the general formula R(NCS)n in which R is an aliphatic group and n is a whole number greater than 1, said aliphatic polyisothiocyanate being added in amounts sufficient to impart extreme pressure properties to said lubricating oil.

9. An improved extreme pressure lubricant comprising a mineral lubricating oil and an aromatic polyisothiocyanate having the general formula RINGS)" in which R is an aromatic group and n is a whole number greater than 1, said aromatic polyisothiocyanate being added in amounts sufficient to impart extreme pressure properties to' said lubricating oil.

10. An improved extreme pressure lubricant comprising a mineral lubricating oil and from about 0.05% to about'10% mustard oil potassium acetate polymer.

11. The method of preventing the corrosion of bearing metal alloys having the corrosive susceptibility of alloys of the group consisting of cadmium-silver, cadmium-nickel and copperlead alloys in the presence of a highly refined lubricating oil in internal combustion engines which comprises adding to said lubricating oil a substantial amount but less than 2% of .an organic compound having the general formula RAY) in which R is a substituent selected from the group consisting of an aliphatic group, an aromatic group and a metal, Y is a radical selected from the group consisting of a thiocyano radical and an isothiocyano radical and n is a whole number greater than 1.

12. The method of preventing the corrosion of bearing metal alloys having the corrosive susaiea'roo mula R(NCS)n in which R is ahydrocarbon group selected from the group consisting oian aliphatic group and an aromatic group andn is a whole number greater than 1.

13. The method of preventing the corr,osion of bearing metal alloys having the corrosive susceptibility of alloys of the group consisting of cadmium-silver alloys, cadmium-nickel alloys and copper-lead alloys in the Wstlnceoiahigb 1y refined lubricating oil in internal conibustion engines which comprises adding ,to.said .lubri-' eating oil a substantial amountbut less 'than 2% of a polythiocyanate having. the .geneialjiormula R(SCN)n in which R is ahyd'roca'rb'onselected from the group consisting of an aliphatic group and an aromatic group, and n is a whole number greater than one.

14. The method of preventing the corrosion of bearing metal alloys having the corrosive susceptibility of alloys of the group consisting of cadmium-silver alloys, cadmium-nickel alloys and copper-lead alloys in the presence otahigh- 1y refined lubricating oil in internal combustion engines which comprises adding to said lubrieating oil a. substantial amount, but less than 2%, of an aliphatic polythiocyanate having the general formula R SCN n in which R is an allphatic group and 1z' is a whole number greater than 1.

15. The method of preventing the corrosion than 1.

of bearing metal alloys having the corrosive susceptibility of alloys of the group consisting of cadmium-silver alloys, cadmium-nickel alloys and copper-lead alloys in the presence of a highly refined lubricating oil in internal combustion engines which comprlsesaddlng to said lubrieating oil a submantial amount, but less than 2%; of an aromatic polythiocyanate having the general formula RASON) in which R is an aromatic group and n is a whole number greater than 1.. 1 I

16. The method of preventing the corrosion of bearing metal alloys having the corrosive susceptibility of alloys of the group consisting of .cadmium-'silver alloys, cadmium-nickel alloys I andc'opper-lead alloys in the presence of a higha ly refined lubricating oil in internal combustion engines which comprises adding to said lubricating oil a substantial amount, but less than 2%, of an aliphatic polyisothioeyanate having the general formula R.(NCS) in which R is an aliphatic group and n is a whole number greater than 1.

17. The method oi preventing the corrosion oi bearing metal alloys having the corrosive sus-v ceptibility of alloys of the group consisting of cadmium-silver alloys, cadmium-nickel alloys and copper-lead alloys in the presence of a highly refined lubricating oil in internal combustion engines which comprises "adding to said lubricating oil a substantial amount, but less than 2%, of an aromatic polyisothiocyanate having the general formula R(NCS) in which R is an aromatic group and n is a whole number greater

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2502507 *Sep 23, 1947Apr 4, 1950Du PontDithiocyanogen adducts of esters of 4-hydroxybutadiene-1, 2, and process of making same
US2530408 *Dec 28, 1945Nov 21, 1950Koppers Co IncDithiocyanates
US2733207 *Jan 17, 1952Jan 31, 1956 Phosphorus and sulfur containing
US4657956 *Sep 13, 1985Apr 14, 1987Monsanto Europe, S. A.Compounds useful as stabilizing agents for rubber vulcanizates
US4717754 *Sep 18, 1986Jan 5, 1988Exxon Research & Engineering Co.Oil additives containing a thiocarbamyl moiety
US4794146 *Aug 20, 1987Dec 27, 1988Exxon Research & Engineering Co.Oil additives containing a thiocarbamyl moiety
US4910263 *Oct 3, 1988Mar 20, 1990Exxon Research & Engineering CompanyTris(hydroxymethyl)aminomethane
EP0306823A1 *Jun 7, 1984Mar 15, 1989Monsanto Europe S.A.Dithiocyanates useful as stabilising agents for rubber vulcanisates
Classifications
U.S. Classification508/386, 252/394, 508/154, 558/17, 558/11
Cooperative ClassificationC10N2230/12, C10M2207/125, C10M2201/081, C10M2219/06, C10M1/08, C10M2207/129, C10M2201/08, C10M2207/16, C10M2201/082, C10N2210/03, C10M2201/084
European ClassificationC10M1/08