CA1239632A - Method of electrical contact lubrication - Google Patents
Method of electrical contact lubricationInfo
- Publication number
- CA1239632A CA1239632A CA000477064A CA477064A CA1239632A CA 1239632 A CA1239632 A CA 1239632A CA 000477064 A CA000477064 A CA 000477064A CA 477064 A CA477064 A CA 477064A CA 1239632 A CA1239632 A CA 1239632A
- Authority
- CA
- Canada
- Prior art keywords
- lubricant
- lubrication
- electric contacts
- comprises adding
- lubricant composition
- 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.)
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Abstract
ELECTRICAL CONTACT LUBRICANT COMPOSITION
AND METHOD OF LUBRICATION
Abstract of the Disclosure An electric contact lubricant is disclosed which comprises a predominant amount of an evaporable solvent and a lubricant which, in turn, comprises a predominant amount of a partially crosslinked polyol ester formed by esterification of an aliphatic mono-carboxylic acid with an aliphatic polyol in the presence of a dibasic acid crosslinker, a lesser amount of a phosphate ester fluid, and one or more corrosion and oxidation inhibitor compounds.
AND METHOD OF LUBRICATION
Abstract of the Disclosure An electric contact lubricant is disclosed which comprises a predominant amount of an evaporable solvent and a lubricant which, in turn, comprises a predominant amount of a partially crosslinked polyol ester formed by esterification of an aliphatic mono-carboxylic acid with an aliphatic polyol in the presence of a dibasic acid crosslinker, a lesser amount of a phosphate ester fluid, and one or more corrosion and oxidation inhibitor compounds.
Description
~239~ 2 ELECTRICAL CONTACT LUBRICANT COMPOSITION
_ AND METHOD_OF LUBRICATION
- Background of the Invention The present invention relates to an electrical contact lubricant composition and to a method of lubrication using it.
Electrical contact lubricants are specialized products which require certain characteristics: good metal wetting properties; good electrical properties;
an acceptable degree of high temperature oxidative stability; good corrosion resistance; and lack of un-desired reactivity in regard to materials adjacent to the electric contact assembly itself. Various types of lubricants have been suggested for such end use applications.
A lubricant for electric contacts comprising pressure gas (FREON brand), solvent (FREON TF brand), a high-stability perfluorinated polyether, and an originally wax-like fraction of a perfluorinated hydrocarbon is described in Proc. Int. Conf. Electr.
Contact Phenom., 10th, 1980, 1, 475-488. Japanese Tokkyo Koko 81/23,480 describes a lubricating grease for electrical contacts containing pure mineral oil, a lithium soap, and magnesium hydroxide. Japanese Xokai Tokkyo Koko 81/82,894 advocates a siloxane based lubricant containing smaller amounts of powdered silicon dioxide, an aliphatic aluminum salt, and a sulfur-containing lubricity improver. A lubricant composition formed by blending dicarboxylic esters, e.g., bis(2-ethylhexyl) adipate, with derivatives of pyrazolidone and/or triazoles is suggested in French Patent No. 2,493,335. Various polyphenyl ethers, * Trade Mark C-7384 ~r~
1239~:;3;~
natural and synthetic hyarocarbo~s, esters, poly~lycols, fluorinated materials, silicones, and proprietary formula-tions were reported as being tested as lubricants for separable connectors in Electr. Contacts, Proc, ~nnu.
Holm Semin. 1976, 22, 57 - 63, Summary of the Present Invention The present lnvention relates to a lubricant composition and a method for the lubrication of electrical contacts using said lubricant. The lubricant composition for electrical contacts comprises a predominant amount of an evaporable solvent and a lubricant which comprises a predominant amount of a partially crosslinked polyol ester, which is the esterification reaction product of an aliphatic monocarboxylic acid and an aliphatic polyol in the presence of a dibasic acid crosslinker, a lesser amount of a phosphate ester fluid and at least one inhibitor compound.
Detailed Description of the Present Invention _ The type of evaporable solvent which is useful in connection with the present invention comprises a predominant part of the present composition, e.g., from about 75~ to about just under 100% (e.g. 99.99%), by weight of the entire composition. It is preferably a solvent which has a high degree of room temperature volatility (e.g., a boiling point under about 50C., preferably well under that temperature, for exa~ple, below 30C.). The solvent is one which should leave no deposits of its own on the electrical contacts and it should insure a smooth even coverage of the contacts with the lubrlcant composition it caxries, The preferred solvents of choice are the halogenated lower alkanes, e,g., those containing both chloro and fluoro substltuents since they ha~e attractively high flash ~1 ~ G ' ~L~3~3gj32 points and are therefore of low flammability. A pre-ferred solvent is 1,1,2-trichloro-1,2,2,-trifluoroethane which is sold under the trademark FREON TF by Du Pont.
The present lubricant composition also contains a lesser amount than the evaporable solvent, e.g., up to 25% of the entire composition, of a lubricant con-taining a predominant amount of a partially crosslinked polyol ester in combination with a small amount of a triaryl phosphate fluid. The ester is an esterification reaction product of an aliphatic monocarboxylic and an aliphatic polyol in the presence of a minor amount of dibasic acid as crosslinking agent.
The aliphatic monocarboxylic acids used in accordance with this invention are compounds or mixtures of compounds having average chain lengths of from about 4 to about 12 carbon atoms, preferably from about 5 to about 9 carbon atoms. The individual acids can range in chain length from about 2 to about 18 carbon atoms. Normal acids are preferred, although branched monocarboxylic acids can also be used, particularly those with no more than two carbon atoms in side chains.
In synthesizing the partially crosslinked polyol esters, minor amounts (e.g., from about 0.1 to about 10%, by weight of the polyol) of dibasic acids are employed as crosslinking agents in order to increase (or build) the viscosity of the normal un-crosslinked polyol ester. The alkyl or aryl portion of the dibasic acid generally ranges from about 2 to about 18 carbon atoms, more preferably from about 4 to about 12 carbon atoms. Particularly preferred dibasic acids include adipic, azelaic, isophthalic, and mixtures thereof. Also included for purposes of crosslinking are the dimer and trimer acids and mixtures thereof.
~L~3963~
The polyols used are those having at least two, and preferably at least three, methylol groups on a quaternary carbon atom. Among the polyols which can be used are trimethylolpropane, trimethylolethane, neopentyl glycol, pentaerythritol, 2-butyl-2-ethyl-1,3-propanediol, 2,2,4-trimethyl-1,3-pentanediol, and mixtures thereof.
Also included within the definition of polyols are those polyols which are formed from either condensation of two or more polyols within the defini-tion above, provided that no more than four polyol units are so condensed and further provided that at least four OH groups are available.
Generally speaking, the polyol ester component of the present lubricant will comprise a predominant portion of the lubricant composition carried by the evaporable solvent. Representative amounts range from about 93% to about 97~, by weight of the lubricant carried by the solvent.
Another component of the present lubricant carried by the solvent, which is used in much lower amount than the partially crosslinked polyol ester, is a triaryl phosphate fluid such as tricresyl phos-phate. It is present at from about 0.1% - 5%, preferably 1 - 3~, by weight of the lubricant. It contributes to the desired degree of fluid cleanliness when the lubricant is used by possibly passivating such metal species as iron. It also aids in lubri-cating the contacts, and it has an affinity for metal surfaces which is also desired.
In addition to the foregoing products, the lubricant carried by the solvent advantageously lZ39~3~, also contalns one or more oxidation and corrosion inhibitors to give the final lubricant the desired degree of oxidation and corrosion inhibition. The total weight for these ingredients can range from about 1% -3~, by weight of the lubricant which is carried by the solvent.
Organic compounds which contain sulfur, nitrogen, phosphorus or alkylphenols and which have utility in inhibiting oxidation in polyol ester lubricant fluids can be used in conjunction with the present invention.
Preferred are aromatic amine oxidation inhibitors, particularly those of the formula ~ NR'R"
where R can be hydrogen or alkyl, R' can be hydrogen or alkyl, and R" can be hydrogen, phenyl, naphthyl, aminophenyl or alkyl substituted phenyl. The size of the alkyl moiety can range from 1 to about 8 -10.
Representative compounds include N,N'-dioctyldiphenyl-amine, 4-octyl-N-(4-octylphenyl)benzenamine, and phenyl-alpha-naphthylamine. Representative amounts can range from about 0.1~ to about 2%, by weight of the lubricant carried by the solvent.
A corrosion inhibitor for the metal forming the electric contact (e.g., copper) can also be in-cluded in the lubricant which is carried by the solvent. Representative amounts range from about 0.005~ to about 0.1%, by weight of the lubricant, with such compounds as the dialkyl thiadiazoles, benzotriazole, purpurxanthrene, anthrarufin, and chrysazin being useful.
963;2 The type of evaporable solvent described before must be air evaporable. The evaporation rate should not be so rapid as to lead to condensation of unwanted - moisture on the electrical contacts. The rate needs, however, to be sufficiently rapid and complete to insure removal of substantially all the solvent from the area to be lubricated.
The followin~ Examples illustrate certain em-bodiments of the present invention.
~239~3Z
This Example illustrates formation of the electrical contact lubricant which,when mixed with evaporable solvent,results ln the composition of the present in~ention.
The following ingredients were blended in the weights given below to form the lubricant. The pentaerythritol ester was charged into a blending vessel equipped with heating and stirring devices.
This base oil was then heated with agitation as all the preweighed additives were added. Heating and agitation were continued until the additives were completely dissolved - about 30 minutes with a maximum temperature of 105C. Stirring continued as the blend was allowed to cool. Cooling under agitation was continued until a safe handling temperature was attained. The product was then filtered (10~) lnto the final containers.
Parts By Approx. %
IngredientWeight By Weight Pentaerythritol ester of C7' acid crosslinked wit*h azelaic acid (BASE STOCK 810 from Stauffer Chemical Company) 3839.2 95.98 Natural cresylic acid based tri-cresyl phosphate (SYN-O-AD 8484 from Stauffer Chemical Company)80.0 2.0 Benzotriazole corrosion inhibitor0.80 0.02 4-octyl-N-(4-octylphenyl)benzen-amine oxidation inhibitor (VANLUBE 81*brand from R. T.
Vanderbilt and Company)40.0 1.0 Phenyl-alpha-naphthylamine corrosion inhibitor 40.0 1.0 Silicone antifoam (SWS 101* brand 10 parts by weight per from SWS Silicones) million parts by wgt.
of the entire compos-C-7384 ition.
* Trade Mark ~Z3~;32 The lubricant described above had the following physical properties:
-Properties Value Viscosity (in cs) at 210F(98.9C.) 11.34 5at 100F(37.8C.) 76.66 at 0F(-17.8C.) 3692.2 Pour Point (F~ - 34.
(C) - 36.7 Evaporation Rate (% Loss) at 300F.
10(148.8C.) - 22 hours 0.4 Acid number (mg KOH/gm) 0.09 Auto Ignition temp. (F.) 865 (C.) 462.8 Flash Point (F.) 545 15(C.) 285 Fire Point (F.) 615 (C.) 323.9 3 99~ 3 ~
Listed below are some additional physical per-formance data for the lubricant described in Example 1.
Oxidation - Corrosion ... . _ . .. .
Federal Standard Test Method 791a, Method 5308 72 Hr. 48 Hr.
347F(175C? 425F(218.3C) 100F (37.8C) Viscocity Increase, % 3.4 13.5 '~` TAN 0.241.71 Metal Corrosion, mg/cm2 Magnesium - 0.05- 0.24 Steel - 0.05+ 0.10 Aluminum + 0.01+ 0.05 Silver 0 + 0.08 Copper + 0.10 0 % Insolubles NIL 1.0 Volatility Test Method: ASTM D972 Duration: 6.5 Hours Temperature, F ~ Loss 300 (148.9C) 0.09 350 (176.7C) 0.34 400 (204.4C) 1.1 ~Z3963Z
This Example illustrates the composition of - the present invention.
The following blends were made to formulate a spray for electrical contacts using the composition of Example l with a trichlorinated/trifluorinated evaporable solvent. All amounts given below are in parts by weight.
---Formulation---Ingredient A B C
Composition from Example 1 0.01 0.1 1.0 1,1,2-trichloro-1,2,2, trifluoroethane (FREON TF brand from Du Pont)99,99 99,9 gg,o ~39~32 The foregoing Examples illustrate certain embodiments of the present invention but should not be construed in a limiting sense. The scope of protection sought is set forth in the Claims which follow.
_ AND METHOD_OF LUBRICATION
- Background of the Invention The present invention relates to an electrical contact lubricant composition and to a method of lubrication using it.
Electrical contact lubricants are specialized products which require certain characteristics: good metal wetting properties; good electrical properties;
an acceptable degree of high temperature oxidative stability; good corrosion resistance; and lack of un-desired reactivity in regard to materials adjacent to the electric contact assembly itself. Various types of lubricants have been suggested for such end use applications.
A lubricant for electric contacts comprising pressure gas (FREON brand), solvent (FREON TF brand), a high-stability perfluorinated polyether, and an originally wax-like fraction of a perfluorinated hydrocarbon is described in Proc. Int. Conf. Electr.
Contact Phenom., 10th, 1980, 1, 475-488. Japanese Tokkyo Koko 81/23,480 describes a lubricating grease for electrical contacts containing pure mineral oil, a lithium soap, and magnesium hydroxide. Japanese Xokai Tokkyo Koko 81/82,894 advocates a siloxane based lubricant containing smaller amounts of powdered silicon dioxide, an aliphatic aluminum salt, and a sulfur-containing lubricity improver. A lubricant composition formed by blending dicarboxylic esters, e.g., bis(2-ethylhexyl) adipate, with derivatives of pyrazolidone and/or triazoles is suggested in French Patent No. 2,493,335. Various polyphenyl ethers, * Trade Mark C-7384 ~r~
1239~:;3;~
natural and synthetic hyarocarbo~s, esters, poly~lycols, fluorinated materials, silicones, and proprietary formula-tions were reported as being tested as lubricants for separable connectors in Electr. Contacts, Proc, ~nnu.
Holm Semin. 1976, 22, 57 - 63, Summary of the Present Invention The present lnvention relates to a lubricant composition and a method for the lubrication of electrical contacts using said lubricant. The lubricant composition for electrical contacts comprises a predominant amount of an evaporable solvent and a lubricant which comprises a predominant amount of a partially crosslinked polyol ester, which is the esterification reaction product of an aliphatic monocarboxylic acid and an aliphatic polyol in the presence of a dibasic acid crosslinker, a lesser amount of a phosphate ester fluid and at least one inhibitor compound.
Detailed Description of the Present Invention _ The type of evaporable solvent which is useful in connection with the present invention comprises a predominant part of the present composition, e.g., from about 75~ to about just under 100% (e.g. 99.99%), by weight of the entire composition. It is preferably a solvent which has a high degree of room temperature volatility (e.g., a boiling point under about 50C., preferably well under that temperature, for exa~ple, below 30C.). The solvent is one which should leave no deposits of its own on the electrical contacts and it should insure a smooth even coverage of the contacts with the lubrlcant composition it caxries, The preferred solvents of choice are the halogenated lower alkanes, e,g., those containing both chloro and fluoro substltuents since they ha~e attractively high flash ~1 ~ G ' ~L~3~3gj32 points and are therefore of low flammability. A pre-ferred solvent is 1,1,2-trichloro-1,2,2,-trifluoroethane which is sold under the trademark FREON TF by Du Pont.
The present lubricant composition also contains a lesser amount than the evaporable solvent, e.g., up to 25% of the entire composition, of a lubricant con-taining a predominant amount of a partially crosslinked polyol ester in combination with a small amount of a triaryl phosphate fluid. The ester is an esterification reaction product of an aliphatic monocarboxylic and an aliphatic polyol in the presence of a minor amount of dibasic acid as crosslinking agent.
The aliphatic monocarboxylic acids used in accordance with this invention are compounds or mixtures of compounds having average chain lengths of from about 4 to about 12 carbon atoms, preferably from about 5 to about 9 carbon atoms. The individual acids can range in chain length from about 2 to about 18 carbon atoms. Normal acids are preferred, although branched monocarboxylic acids can also be used, particularly those with no more than two carbon atoms in side chains.
In synthesizing the partially crosslinked polyol esters, minor amounts (e.g., from about 0.1 to about 10%, by weight of the polyol) of dibasic acids are employed as crosslinking agents in order to increase (or build) the viscosity of the normal un-crosslinked polyol ester. The alkyl or aryl portion of the dibasic acid generally ranges from about 2 to about 18 carbon atoms, more preferably from about 4 to about 12 carbon atoms. Particularly preferred dibasic acids include adipic, azelaic, isophthalic, and mixtures thereof. Also included for purposes of crosslinking are the dimer and trimer acids and mixtures thereof.
~L~3963~
The polyols used are those having at least two, and preferably at least three, methylol groups on a quaternary carbon atom. Among the polyols which can be used are trimethylolpropane, trimethylolethane, neopentyl glycol, pentaerythritol, 2-butyl-2-ethyl-1,3-propanediol, 2,2,4-trimethyl-1,3-pentanediol, and mixtures thereof.
Also included within the definition of polyols are those polyols which are formed from either condensation of two or more polyols within the defini-tion above, provided that no more than four polyol units are so condensed and further provided that at least four OH groups are available.
Generally speaking, the polyol ester component of the present lubricant will comprise a predominant portion of the lubricant composition carried by the evaporable solvent. Representative amounts range from about 93% to about 97~, by weight of the lubricant carried by the solvent.
Another component of the present lubricant carried by the solvent, which is used in much lower amount than the partially crosslinked polyol ester, is a triaryl phosphate fluid such as tricresyl phos-phate. It is present at from about 0.1% - 5%, preferably 1 - 3~, by weight of the lubricant. It contributes to the desired degree of fluid cleanliness when the lubricant is used by possibly passivating such metal species as iron. It also aids in lubri-cating the contacts, and it has an affinity for metal surfaces which is also desired.
In addition to the foregoing products, the lubricant carried by the solvent advantageously lZ39~3~, also contalns one or more oxidation and corrosion inhibitors to give the final lubricant the desired degree of oxidation and corrosion inhibition. The total weight for these ingredients can range from about 1% -3~, by weight of the lubricant which is carried by the solvent.
Organic compounds which contain sulfur, nitrogen, phosphorus or alkylphenols and which have utility in inhibiting oxidation in polyol ester lubricant fluids can be used in conjunction with the present invention.
Preferred are aromatic amine oxidation inhibitors, particularly those of the formula ~ NR'R"
where R can be hydrogen or alkyl, R' can be hydrogen or alkyl, and R" can be hydrogen, phenyl, naphthyl, aminophenyl or alkyl substituted phenyl. The size of the alkyl moiety can range from 1 to about 8 -10.
Representative compounds include N,N'-dioctyldiphenyl-amine, 4-octyl-N-(4-octylphenyl)benzenamine, and phenyl-alpha-naphthylamine. Representative amounts can range from about 0.1~ to about 2%, by weight of the lubricant carried by the solvent.
A corrosion inhibitor for the metal forming the electric contact (e.g., copper) can also be in-cluded in the lubricant which is carried by the solvent. Representative amounts range from about 0.005~ to about 0.1%, by weight of the lubricant, with such compounds as the dialkyl thiadiazoles, benzotriazole, purpurxanthrene, anthrarufin, and chrysazin being useful.
963;2 The type of evaporable solvent described before must be air evaporable. The evaporation rate should not be so rapid as to lead to condensation of unwanted - moisture on the electrical contacts. The rate needs, however, to be sufficiently rapid and complete to insure removal of substantially all the solvent from the area to be lubricated.
The followin~ Examples illustrate certain em-bodiments of the present invention.
~239~3Z
This Example illustrates formation of the electrical contact lubricant which,when mixed with evaporable solvent,results ln the composition of the present in~ention.
The following ingredients were blended in the weights given below to form the lubricant. The pentaerythritol ester was charged into a blending vessel equipped with heating and stirring devices.
This base oil was then heated with agitation as all the preweighed additives were added. Heating and agitation were continued until the additives were completely dissolved - about 30 minutes with a maximum temperature of 105C. Stirring continued as the blend was allowed to cool. Cooling under agitation was continued until a safe handling temperature was attained. The product was then filtered (10~) lnto the final containers.
Parts By Approx. %
IngredientWeight By Weight Pentaerythritol ester of C7' acid crosslinked wit*h azelaic acid (BASE STOCK 810 from Stauffer Chemical Company) 3839.2 95.98 Natural cresylic acid based tri-cresyl phosphate (SYN-O-AD 8484 from Stauffer Chemical Company)80.0 2.0 Benzotriazole corrosion inhibitor0.80 0.02 4-octyl-N-(4-octylphenyl)benzen-amine oxidation inhibitor (VANLUBE 81*brand from R. T.
Vanderbilt and Company)40.0 1.0 Phenyl-alpha-naphthylamine corrosion inhibitor 40.0 1.0 Silicone antifoam (SWS 101* brand 10 parts by weight per from SWS Silicones) million parts by wgt.
of the entire compos-C-7384 ition.
* Trade Mark ~Z3~;32 The lubricant described above had the following physical properties:
-Properties Value Viscosity (in cs) at 210F(98.9C.) 11.34 5at 100F(37.8C.) 76.66 at 0F(-17.8C.) 3692.2 Pour Point (F~ - 34.
(C) - 36.7 Evaporation Rate (% Loss) at 300F.
10(148.8C.) - 22 hours 0.4 Acid number (mg KOH/gm) 0.09 Auto Ignition temp. (F.) 865 (C.) 462.8 Flash Point (F.) 545 15(C.) 285 Fire Point (F.) 615 (C.) 323.9 3 99~ 3 ~
Listed below are some additional physical per-formance data for the lubricant described in Example 1.
Oxidation - Corrosion ... . _ . .. .
Federal Standard Test Method 791a, Method 5308 72 Hr. 48 Hr.
347F(175C? 425F(218.3C) 100F (37.8C) Viscocity Increase, % 3.4 13.5 '~` TAN 0.241.71 Metal Corrosion, mg/cm2 Magnesium - 0.05- 0.24 Steel - 0.05+ 0.10 Aluminum + 0.01+ 0.05 Silver 0 + 0.08 Copper + 0.10 0 % Insolubles NIL 1.0 Volatility Test Method: ASTM D972 Duration: 6.5 Hours Temperature, F ~ Loss 300 (148.9C) 0.09 350 (176.7C) 0.34 400 (204.4C) 1.1 ~Z3963Z
This Example illustrates the composition of - the present invention.
The following blends were made to formulate a spray for electrical contacts using the composition of Example l with a trichlorinated/trifluorinated evaporable solvent. All amounts given below are in parts by weight.
---Formulation---Ingredient A B C
Composition from Example 1 0.01 0.1 1.0 1,1,2-trichloro-1,2,2, trifluoroethane (FREON TF brand from Du Pont)99,99 99,9 gg,o ~39~32 The foregoing Examples illustrate certain embodiments of the present invention but should not be construed in a limiting sense. The scope of protection sought is set forth in the Claims which follow.
Claims (26)
1. A lubricant composition for electric contacts which comprises a predominant amount of an evaporable solvent and a lubricant which comprises a predominant amount of a partially crosslinked polyol ester, which is the esterification reaction product of an aliphatic monocarboxylic acid and an aliphatic polyol in the presence of a dibasic acid crosslinker, a lesser amount of a phosphate ester fluid and at least one inhibitor compound.
2. A lubricant composition as claimed in Claim 1 wherein the evaporable solvent comprises from about 75% to about just under 100% by weight of the composition.
3. A lubricant composition as claimed in Claim 1 wherein the solvent is a halogenated alkane having a boiling point under about 50°C.
4. A lubricant composition as claimed in Claim 1 wherein the solvent is 1,1,2-trichloro-1,2,2-tri-fluoroethane.
5. A lubricant composition as claimed in Claim 1 wherein the monocarboxylic acid has an average chain length of from about 4 to about 12 carbon atoms and the polyol has at least two methylol groups on a quaternary carbon atom.
6. A lubricant composition as claimed in Claim 1 wherein the monocarboxylic acid has a chain length of about seven and the polyol is pentaerythritol.
7. A lubricant composition as claimed in claim 1 wherein the dibasic acid crosslinker has an alkyl portion of from about 2 to about 18 carbon atoms.
8. A lubricant composition as claimed in Claim 1 wherein the dibasic acid crosslinker is azelaic acid.
9. A lubricant composition as claimed in Claim 1 which comprises from about 75 % to about just under 100% by weight of an evaporable halogenated alkane solvent with the remainder being a lubricant which comprises from about 93% to about 97%, by weight, of the partially crosslinked polyol ester, from about 1 to about 3%, by weight, of a triaryl phosphate fluid, and from about 1% to about 3% by weight of the inhibitor compound.
10. A lubricant composition as claimed in Claim 9 in which the ester is the pentaerythritol ester of a C7 acid crosslinked with azelaic acid and the triaryl phosphate is tricresyl phosphate.
11. A lubricant composition as claimed in Claim 9 wherein the inhibitor compound is selected from benzotriazole, phenyl alpha naphthylamine, and mixtures thereof.
12. A lubricant composition as claimed in Claim 9 wherein the inhibitor compound is 4-octyl-N-(4-octylphenyl)-benzenamine.
13. A lubricant composition as claimed in Claim 9 wherein the evaporable halogenated alkane solvent is 1,1,2-trichloro-1,2,2-trifluoroethane.
14. A method for the lubrication of electric contacts which comprises adding thereto the lubricant of Claim 1.
15. A method for the lubrication of electric contacts which comprises adding thereto the lubricant of Claim 2.
16. A method for the lubrication of electric contacts which comprises adding thereto the lubricant of Claim 3.
17. A method for the lubrication of electric contacts which comprises adding thereto the lubricant of Claim 4.
18. A method for the lubrication of electric contacts which comprises adding thereto the lubricant of Claim 5.
19. A method for the lubrication of electric contacts which comprises adding thereto the lubricant of Claim 6.
20. A method for the lubrication of electric contacts which comprises adding thereto the lubricant of Claim 7.
21. A method for the lubrication of electric contacts which comprises adding thereto the lubricant of Claim 8.
22. A method for the lubrication of electric contacts which comprises adding thereto the lubricant of Claim 9.
23. A method for the lubrication of electric contacts which comprises adding thereto the lubricant of Claim 10.
24. A method for the lubrication of electric contacts which comprises adding thereto the lubricant of Claim 11.
25. A method for the lubrication of electric contacts which comprises adding thereto the lubricant of Claim 12.
26. A method for the lubrication of electric contacts which comprises adding thereto the lubricant of Claim 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000477064A CA1239632A (en) | 1985-03-21 | 1985-03-21 | Method of electrical contact lubrication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000477064A CA1239632A (en) | 1985-03-21 | 1985-03-21 | Method of electrical contact lubrication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1239632A true CA1239632A (en) | 1988-07-26 |
Family
ID=4130085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000477064A Expired CA1239632A (en) | 1985-03-21 | 1985-03-21 | Method of electrical contact lubrication |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1239632A (en) |
-
1985
- 1985-03-21 CA CA000477064A patent/CA1239632A/en not_active Expired
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |