US3775317A - Electric contact grease - Google Patents

Electric contact grease Download PDF

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Publication number
US3775317A
US3775317A US00264062A US3775317DA US3775317A US 3775317 A US3775317 A US 3775317A US 00264062 A US00264062 A US 00264062A US 3775317D A US3775317D A US 3775317DA US 3775317 A US3775317 A US 3775317A
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United States
Prior art keywords
contact
grease
percent
mineral oil
weight
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Expired - Lifetime
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US00264062A
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English (en)
Inventor
A Inami
S Shida
M Haga
K Kariya
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M5/00—Solid or semi-solid compositions containing as the essential lubricating ingredient mineral lubricating oils or fatty oils and their use
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/10—Compounds containing silicon
    • C10M2201/105—Silica
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/104—Aromatic fractions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/106—Naphthenic fractions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2211/00—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions
    • C10M2211/02—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions containing carbon, hydrogen and halogen only
    • C10M2211/024—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions containing carbon, hydrogen and halogen only aromatic
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2211/00—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions
    • C10M2211/06—Perfluorinated compounds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
    • C10M2215/066—Arylene diamines
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
    • C10M2215/067—Polyaryl amine alkanes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/14—Electric or magnetic purposes
    • C10N2040/16—Dielectric; Insulating oil or insulators
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/14—Electric or magnetic purposes
    • C10N2040/17—Electric or magnetic purposes for electric contacts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10—Semi-solids; greasy
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2070/00—Specific manufacturing methods for lubricant compositions

Definitions

  • R is alkyl containing 3 to 10 carbon atoms
  • R is a member selected from the group consisting of alkyl containing 3 to 10 carbon atoms, cycloalkyl and ml, and (ii) amino compounds having the following formula:
  • the present invention relates to an electric contact grease which has particular application in sliding contacts of electrical machines and apparatuses.
  • contact failure is usually caused by oxidation, sulphurization and wear of contact metal surfaces and sludge formed by oxidation and polymerization of grease itself used for the contact. Therefore, the role of contact grease is to prevent oxidation, sulphurization and wear of con- 4 Claims Iii tact metals so as to stabilize the electric contact resistance, to prevent noise and to lengthen the life of the electric contact.
  • An object of the present invention is to provide a contact grease capable of preventing wear of the electric sliding contact.
  • a contact grease according to the present invention com- 3,775,317 Patented Nov. 27, 1973 "ice Another object of the present invention is to provide a contact grease which stabilizes contact resistance and thereby prevents noise in the electric contact.
  • a further object of theprcsent invention is to provide a contact grease which prevents damage to electric contacts, due to variable circumstances.
  • FIG. 1 shows the relationship between the number of times of sliding action and the stability of electrical contact resistance.
  • a contact grease according to the present invention consists essentially of a major amount of a paraffinic mineral oil, 2 to 15 percent by weight of chlorinated aromatic hydrocarbon, 7 to 12 percent by weight of colloidal silica and 0.1 to 3.0 percent by weight of at least one member selected from the group consisting of (i) amino compounds having the following formula:
  • R is alkyl containing 3 to 10 carbon atoms
  • R is a member selected from the group consisting of alkyl containing 3 to 10 carbon atoms, cycloalkyl and aryl, and (ii) amino compounds having the following formula:
  • R, and R are alkyl containing 1 to 10 carbon atoms, respectively.
  • Anti-rust agent or anti-sulphurizing agents are preferably added to the composition of the grease.
  • novel contact grease according to the present incontact metal because of its good chemical stability and a mechanical characteristics though its electric resistivity is comparably higher.
  • Paraflinic mineral oil defined herein includes pure para flinic mineral oil having a small amount, for example, up to '20 percent by weight of aromatic and/or naphthenic mineral oil incorporated therein. It is preferable that the paralfinic mineral oil has a viscosity of 50 to 140 centistoltes (at 37.8 C.) and an aniline point higher than in .the ASTM 06ll-55T (American Society for Testing Materials).
  • a paraftinic mineral oil having a viscosity iower than I 50 est. results in a contact grease which has poor antiwearing property, and higher than est. results in contact grease which has poor stability of contact resistance.
  • Paraflinic mineral oil which has aniline point lower than about 95 results in contact grease which has a tendency towards noise occurrence at comparably high temperature.
  • prises chlorinated aromatic hydrocarbon i.e., at least one member selected from the group consisting of tetrachlorodiphenyl, pentachlorodiphenyl, hexachlorodiphenyl and polychlorotriphenyl.
  • chlorinated aromatic hydrocarbon i.e., at least one member selected from the group consisting of tetrachlorodiphenyl, pentachlorodiphenyl, hexachlorodiphenyl and polychlorotriphenyl.
  • the chlorinated aromatic hydrocarbon is present in an amount higher than about percent by weight, the electric contact resistance is diiiicult to stabilize.
  • the antiwearing property of the grease becomes smaller.
  • the contact grease according to the present invention also comprises colloidal silica having a BET-surface area (surface area measured by BET method) of from 180 to 330 mF/g.
  • the amino compound as antioxidant not only serves to prevent mineral oil from oxidation and polymerization, but at the same time decreases the wear of the contact metal and stabilizes the contact resistance.
  • the contact grease using silicone oil as base oil is inferior to the grease according to the present invention in the anti-wearing property.
  • a mixture of the paraffinie mineral oil, the chlorinated diphenyl, and the amino compound with or without rust inhibitor and antisulphurizing agent is heated at 120 to 150 C. to make a homogeneous liquid, and then the colloidal silica is added thereto under stirring to make a homogeneous paste.
  • the cooled mixture is milled by a usual method, e.g. employing three roll mills, and is subjected to a reduced pressure so as to remove air and foam.
  • the resulting greases are smooth and buttery in texture and have excellently mechanical and thermal stability.
  • the invention is described in the following examples, which are for the purpose of i1- !ustration and are not considered to be limitativc with respect to scope or conditions.
  • g.” represents grams.
  • Example 1 A mixture of 81.5 g. of parafiinic mineral oil having viscosity of 65 cst.at 37.8 C. and aniline point of 98.2 C., 70 g. of tctrachloro diphenyl and 2.0 g. of N,N,N',N- tetramethyi-4,4'-diamino-dipheuyi methane (tetra base) is heated at about 130 C.
  • Aerosil-300 (trade name of colloidal silica having'BET surface area of about 300 m./g., which is manufactured by Japan Aerosil Company Ltd.) is added to the mixture under stirring.
  • the mixture After being homogenized. the mixture is cooled to room temperature and milled with three roll mill. Then the foam remaining in the grease is removed under reduced pressure. The resulting grease is stable and has a pour point of higher than 230' C. The grease is applied to an electric contact.
  • Example 2 A mixture of 74.5 g.- of paraflinic mineral oil having viscosity of 110.2 cat. at 37.8 C. and aniline point of 113.0 C., 12.5 3.01 hexachlorodiphenyl and 1.8g..o1 N,N'-di-sec-butyi-paraphenylene diamine is heated at about 150' C. 7
  • Aerosil-300 After being homogenized, 11.2 g. of Aerosil-300 is added to the mixture under stirring.
  • Example 4 The resulting mixture is treated in a way similar to that of Example 1: The test is carried out similarly to Example 1 and the result is shown in Table 1 and FIG. 1.
  • Example 3 of Acrosil-200 (having BET surface area of about 200 mF/g.) is added thereto and the mixture is treated in a way similar to Example l.
  • Example 4 The mixture of 85.6 g. of parafiinic mineral oil having viscosity of 104.3 cat. at 37.8 C. and aniline point of 105.2 C., 2.0 g. of tetrachlorodiphenyl and 1.9 g. of
  • N,N'-di-sec-hexyl-paraphenylene diamine is heated at 130 C.
  • Aerosil-300 After being homogenized, 10.5 g. of Aerosil-300 is added thereto and the mixture is treated in a way similar 7 v to Example 1.
  • Example 5 The mixture of 78.2 g. of paraffinic mineral oil having viscosity of 110.1 cst. at 37.8" C. and aniline point of 112.1 C., 12.0 g. of heptachlorodiphenyl and 0.2 g. of N, N"di-sec-hexyl-para-phcnylene diamine is heated at 145' C. 7
  • Aerosil-200 After being homogenized, 9.7 g. of Aerosil-200 is added thereto and the mixture is treated in a way similar to Example 1. The testing result is shown in Table 1 and FIG. 1.
  • Example 6 The mixture of 76.7 g. of paraflinic mineral oil having viscosity of 134.2 cst. at 37.8 C., 10.0 g. of hcxachlorodiphenyl, and 3.0 g. of N,N'-dimethyl-N,N'-dioctyl-4,4' diamino diph'enyl methane is heated at C. After being homogenized, 10.3 g. of Aerosil-300 is added hereto and the mixture is treated in a way similar to Example 1.
  • the testing result is shown in Table 1 and FIG. 1.
  • Example 1 The mixture of 85.2 g. of paraflinic mineral oil having viscosity of 55.2 cst. and aniline point of 96.3 C, 4.5 g. of tetrachiorodiphenyl and 0.5 g. of N-isopropyl-N'- phcnyl-para-phenylene-diamine is heated at C.
  • the testing result is shown in Table 1 and FIG. 1.
  • Example 9 The mixture of 808g. of parafiinic mineral oil having viscosity of 82.5 cst. at37.8 C. and aniline point of homogenized, 9.8 g. of Aerosil-300 is added l02.5 C., 8.5 g. of hexachlorodiphenyl and 2.0 g. of tetra base is heated at 140' C.
  • Aerosil-200 After being homogenized, 8.7 g. of Aerosil-200 is added thereto and the mixture is treated in a way similar to Example 1. a
  • the testing result is shown in Table l and FIG. 1.
  • Example 1 The mixture of 83.1 g. of paraflinic mineral oil having viscosity of 98.5 cst. and aniline point of 112.0 C., 1
  • Example 11 The mixture of 80.8 g. of paraflinic mineral oil having VlSCOSliy of 77.5 est. and aniline point of 108.2 C., 7.3 g. of hcxachlorodiphenyl and 2.5 g. of N,N'di-sec-butylpara-phenylene diamine is heated at 140' C.
  • Aerosil-249l After being homogenized, 9.4 g. of Aerosil-249l is added thereto and the 'mixture is treated in a way similar to Example 1.
  • the testing result is shown in Table l and FIG. 1.
  • Table 1 shows the test results of antiwearing property of the greases of from Example 1 to 11 and commercially available conventional greases for comparison.
  • the greases were applied to the sliding contact which comprises a combination of a movable contact rivet and fixed contact plate.
  • the material used for the fixed contact plate is nicltei.
  • the radius of curvature of the top of the movable contact rivet is 2 mm.
  • the rivet is madeof at least one member selected from the group consisting of platinum, gold, silver, copper and their alloys.
  • the wear of the contact rivet was measured as decreased thickness of the top of the rivet after 50 thousand times of sliding action with sliding speed of 8 cm./sec. and sliding distance of 4 cm.
  • the reference numbers 1 to 19 in FIG. 1 correspond to the test number in Table 1, respectively.
  • the difference between the contact resistance before and after sliding action should not be large in order to be used effectively for electric contact.
  • the grease according to the present invention provides an electric contact having a stable contact resistivity, with prevention of noise generation completely and lengthening the life of the electric contact.
  • Example 1 0. 036 2 Fxnmple 2 0. 02'.
  • Example 8 0. 0'15
  • Example 4 0.032
  • Example 5 0. 027
  • Example 7. 0. (H3 Example 8. 0.010
  • a contact grease consisting essentially of (a) a major amount of parafiinic mineral oil,
  • R is alkyl containing 3 to 10 carbon atoms
  • R is a member selected from the group consisting of alkyl containing 3 to 10 carbon atoms, cycloalkyl and phenyl and (ii) amino compounds having the following formula:
  • a contact grease of claim 1 wherein said parafiinic mineral oil has viscosity of 50 to centistokes at a temperature of 37.8 C. and aniline point of higher than 950 3.
  • said chlorinated aromatic hydrocarbon is a member selected from the group consisting of tetrachlorodlphenyl, pentachlorodiphenyl, hexachlorodiphenyl and polychlorotriphenyl.
  • a contact grease of claim 1, wherein said colloidal silica has BET surface area of from to 330 m3/g.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
US00264062A 1971-08-17 1972-06-19 Electric contact grease Expired - Lifetime US3775317A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46062793A JPS5130266B2 (fr) 1971-08-17 1971-08-17

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US3775317A true US3775317A (en) 1973-11-27

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US00264062A Expired - Lifetime US3775317A (en) 1971-08-17 1972-06-19 Electric contact grease

Country Status (7)

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US (1) US3775317A (fr)
JP (1) JPS5130266B2 (fr)
CA (1) CA968335A (fr)
DE (1) DE2238426C3 (fr)
FR (1) FR2149380B1 (fr)
GB (1) GB1366584A (fr)
IT (1) IT962119B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5156756A (en) * 1990-04-23 1992-10-20 Kabushiki Kaisha Tokai Rika Denki Seisakusho Lubricant for an electrical sliding contactor
US5346633A (en) * 1991-03-19 1994-09-13 Hitachi, Ltd. Method for surface treatment of a body, surface treatment agent, surface treated body, surface treated members, and apparatus being furnished with same
US6225265B1 (en) * 1998-05-15 2001-05-01 Mabuchi Motor Co., Ltd. Miniature electric motor with reduction worm gear unit
CN109851530A (zh) * 2019-01-02 2019-06-07 中国石油天然气股份有限公司 N,n,n′,n′-十二烷基四取代二苯醚磺酸盐阴离子型双子表面活性剂及其合成
US11174424B2 (en) 2019-01-02 2021-11-16 Petrochina Company Limited Core-shell structured anionic nano microemulsion system, and preparation and application thereof

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5156756A (en) * 1990-04-23 1992-10-20 Kabushiki Kaisha Tokai Rika Denki Seisakusho Lubricant for an electrical sliding contactor
US5346633A (en) * 1991-03-19 1994-09-13 Hitachi, Ltd. Method for surface treatment of a body, surface treatment agent, surface treated body, surface treated members, and apparatus being furnished with same
US6225265B1 (en) * 1998-05-15 2001-05-01 Mabuchi Motor Co., Ltd. Miniature electric motor with reduction worm gear unit
CN109851530A (zh) * 2019-01-02 2019-06-07 中国石油天然气股份有限公司 N,n,n′,n′-十二烷基四取代二苯醚磺酸盐阴离子型双子表面活性剂及其合成
CN109851530B (zh) * 2019-01-02 2021-06-01 中国石油天然气股份有限公司 N,n,n′,n′-十二烷基四取代二苯醚磺酸盐阴离子型双子表面活性剂及其合成
US11174424B2 (en) 2019-01-02 2021-11-16 Petrochina Company Limited Core-shell structured anionic nano microemulsion system, and preparation and application thereof
US11629283B2 (en) 2019-01-02 2023-04-18 Petrochina Company Limited N,N,N′,N′-tetradodecyl-substituted diphenyl ether sulfonate anionic Gemini surfactant and synthesis method thereof

Also Published As

Publication number Publication date
JPS5130266B2 (fr) 1976-08-31
IT962119B (it) 1973-12-20
DE2238426C3 (de) 1974-09-05
FR2149380A1 (fr) 1973-03-30
CA968335A (en) 1975-05-27
JPS4827262A (fr) 1973-04-10
GB1366584A (en) 1974-09-11
DE2238426B2 (de) 1974-02-07
DE2238426A1 (de) 1973-03-22
FR2149380B1 (fr) 1974-12-27

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