US20060205613A1 - Grease composition for harnesses - Google Patents
Grease composition for harnesses Download PDFInfo
- Publication number
- US20060205613A1 US20060205613A1 US11/368,681 US36868106A US2006205613A1 US 20060205613 A1 US20060205613 A1 US 20060205613A1 US 36868106 A US36868106 A US 36868106A US 2006205613 A1 US2006205613 A1 US 2006205613A1
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- grease composition
- harnesses
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- base oil
- basis
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- 0 [4*]C1=CC([5*])([6*])NC2=CC=CC=C12 Chemical compound [4*]C1=CC([5*])([6*])NC2=CC=CC=C12 0.000 description 2
Classifications
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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
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
-
- 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
- C10M2201/14—Inorganic compounds or elements as ingredients in lubricant compositions inorganic compounds surface treated with organic compounds
- C10M2201/145—Inorganic compounds or elements as ingredients in lubricant compositions inorganic compounds surface treated with organic compounds used as thickening agents
-
- 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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/127—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids polycarboxylic
-
- 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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
- C10M2207/1285—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof used as thickening agents
-
- 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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/129—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of thirty or more carbon atoms
-
- 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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/282—Esters of (cyclo)aliphatic oolycarboxylic acids
- C10M2207/2825—Esters of (cyclo)aliphatic oolycarboxylic acids used as base material
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/287—Partial esters
- C10M2207/289—Partial esters containing free hydroxy groups
-
- 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
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/105—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only
- C10M2209/1055—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only used as base material
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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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/22—Heterocyclic nitrogen compounds
- C10M2215/221—Six-membered rings containing nitrogen and carbon only
-
- 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
- C10M2215/22—Heterocyclic nitrogen compounds
- C10M2215/223—Five-membered rings containing nitrogen and carbon only
-
- 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
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/02—Viscosity; Viscosity index
-
- 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
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
-
- 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
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
-
- 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
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/36—Seal compatibility, e.g. with rubber
-
- 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
Definitions
- the present invention relates to a grease composition for use in a harness.
- a lubricant a grease composition obtained by adding a thickening agent to a base oil and then forming the resulting blend into a semi-solid product
- it should satisfy, for instance, the following requirements: it should have excellent corrosion resistance and oxidation stability in order that these parts can be used over a long period of time or in order to extend the service life of the parts.
- olefinic elastomers have recently been substituted for the polyvinyl chloride as a coating material for metallic parts for the purpose of reducing the quantity of materials which may not be environment-friendly and accordingly, it has been desired to design such a grease composition while taking into consideration the compatibility thereof with the coating materials for such parts.
- Patent Document 1 JP-B-6-99702
- this grease composition employs a purified mineral oil as a base oil and therefore, this grease composition is considered to have low compatibility with, for instance, olefinic elastomers and this composition is not designed to take into sufficient consideration the corrosion resistance and the oxidation stability.
- the inventors of this invention have thus conducted various studies to eliminate the foregoing drawbacks associated with the foregoing conventional techniques concerning grease compositions for, in particular, harnesses, have found that the foregoing drawbacks can efficiently be eliminated by the use of a base oil containing a specific component and specific compounds as additives for the grease composition and have thus completed the present invention.
- a grease composition for use in harnesses which comprises a thickening agent, a base oil and additives, wherein the base oil comprises a polyoxyalkylene glycol ether and the additives comprise a quinoline compound and a benzotriazole compound.
- the thickening agent is at least one member selected from the group consisting of lithium soaps and bentonite materials modified with organic compounds (organically modified bentonite materials).
- the polyoxyalkylene glycol ether has a kinematic viscosity as determined at a temperature of 40° C. ranging from 30 to 400 mm 2 /s.
- the content of the quinoline compound ranges from 0.1 to 10% by mass on the basis of the total mass of the grease composition
- the content of the benzotriazole compound ranges from 0.1 to 10% by mass on the basis of the total mass of the grease composition.
- the grease composition of the present invention makes use of a polyoxyalkylene glycol ether-containing base oil and comprises, as additives, a quinoline compound and a benzotriazole compound and therefore, the grease composition is excellent in the compatibility with the coating materials for parts of harnesses such as olefinic elastomers, the corrosion resistance and the resistance to oxidation.
- the grease composition of the present invention is characterized in that it uses, as a base oil, one containing a polyoxyalkylene glycol ether, which does not adversely affect the olefinic materials too much.
- a polyoxyalkylene glycol ether which does not adversely affect the olefinic materials too much.
- polyoxyalkylene glycol ethers represented by the following general formula I: R 1 O—(CH 2 CHR 2 O) n —R 3 Formula I
- R 1 and R 3 each independently represents a hydrogen atom or an alkyl group having 1 to 20, preferably 1 to 6 carbon atoms (such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a pentyl group or a hexyl group);
- R 2 represents an alkyl group having 1 to 10, preferably 1 to 4 carbon atoms (such as a methyl group, an ethyl group, a propyl group or a butyl group); and
- n represents a numeral ranging from 5 to 30 and preferably 8 to 20, provided that R 1 and R 3 do not simultaneously represent hydrogen atoms.
- polyoxyalkylene moieties of the polyoxyalkylene glycol ethers represented by the general formula I include polyoxyethylene, polyoxypropylene, poly(oxypropylene-oxyethylene), poly(oxybutylene-oxyethylene), poly(oxybutylene-oxypropylene), poly(oxypentylene-oxyethylene) and poly(oxypentylene-oxypropylene).
- the polyoxyalkylene glycol ethers represented by the general formula I usable herein may be a mono-ether or a di-ether and specific examples thereof include polyoxypropylene monopropyl ether, polyoxypropylene monobutyl ether, polyoxybutylene monobutyl ether, polyoxyethylene oxypropylene monopropyl ether, polyoxyethylene oxypropylene monobutyl ether, polyoxyethylene oxypropylene monopentyl ether, and polyoxypropylene dimethyl ether.
- Preferred are polyoxypropylene monobutyl ether, and polyoxypropylene dimethyl ether, most preferred is polyoxypropylene dimethyl ether.
- the base oil used in the present invention comprises a polyoxyalkylene glycol ether in an amount of preferably not less than 50% by mass, more preferably not less than 80% by mass and most preferably 100% by mass on the basis of the total mass of the base oil.
- the base oil used in the present invention may further comprise other base oil materials currently used in the grease composition such as mineral oils, synthetic hydrocarbon oils, and alkyl diphenyl ether oils in addition to the polyoxyalkylene glycol ether, but the amount thereof is preferably less than 10% by mass on the basis of the total mass of the base oil.
- the kinematic viscosity of the polyoxyalkylene glycol ether as determined at 40° C. preferably ranges from 30 to 400 mm 2 /s and more preferably 80 to 120 mm 2 /s.
- thickening agent used in the grease composition for harnesses according to the present invention there may be listed, for instance, those conventionally known in this art such as metal salts of fatty acids, bentonite modified with organic compounds and PTFE, with metal salts of fatty acids and bentonite modified with organic compounds being particularly preferably used herein.
- constituent fatty acids of the foregoing metal salts of fatty acids preferably used herein are those having 10 to 30 and more preferably 16 to 20 carbon atoms and examples thereof preferably used herein are lauric acid, myristic acid, palmitic acid, stearic acid, 12-hydroxy stearic acid and oleic acid.
- metal salts of these fatty acids there may be mentioned, for instance, alkali metal salts such as sodium and lithium salts, alkaline earth metal salts such as barium and calcium salts and trivalent metal salts such as aluminum salts.
- Usable herein further include, for instance, salts of mixtures each comprising at least two fatty acids including dibasic acids with metals such as aluminum, calcium and lithium, or complex metallic soaps.
- metals such as aluminum, calcium and lithium
- metal salts of fatty acids most preferably used herein is lithium 12-hydroxy stearate because of its excellent water resistance, heat resistance and mechanical stability.
- the amount of the thickening agent to be incorporated into the grease composition of the present invention preferably ranges from 2 to 35 parts by mass and more preferably 5 to 15 parts by mass per 100 parts by mass of the base oil. This is because, if the amount thereof is less than 2 parts by mass, there would be observed such a tendency that the resulting grease composition is in a highly fluidized state and it is thus too soft, while if the amount thereof exceeds 35 parts by mass, the resulting composition is liable to be too hard to use as a grease composition for harnesses.
- quinoline compounds used in the grease composition for harnesses according to the present invention are compounds represented by the following general formula II, such as trimethyl dihydro-quinoline oligomer.
- R 4 , R 5 and R 6 may be the same or different and each preferably represents an alkyl group preferably having 1 to 10 and more preferably 1 to 3 carbon atoms and n is a numeral preferably ranging from 1 to 10 and more preferably 1 to 5.
- the amount of these quinoline compounds to be incorporated into the grease composition of the present invention preferably ranges from 0.1 to 10% by mass, more preferably 0.5 to 5% by mass and most preferably 1.0 to 3% by mass on the basis of the total mass of the grease composition.
- the grease composition of the present invention may further comprise other anti-oxidants, for instance, a phenolic compound such as 2,6-di-t-butyl cresol and/or an amine compound such as phenyl- ⁇ -naphthyl-amine, in combination with the foregoing components.
- a phenolic compound such as 2,6-di-t-butyl cresol
- an amine compound such as phenyl- ⁇ -naphthyl-amine
- the grease composition for harnesses according to the present invention may comprise a benzotriazole compound as the corrosion inhibitor.
- benzotriazole compounds preferably used herein are those represented by the following general formula III:
- R 7 represents a hydrogen atom or an alkyl group having 1 to 10 and preferably 1 to 3 carbon atoms such as a methyl, ethyl or propyl group
- R 8 and R 9 each independently represents a hydrogen atom or an alkyl group having 1 to 20 and preferably 1 to 10 carbon atoms such as a methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, hexyl, heptyl or octyl group.
- Particularly preferably used herein are, for instance, benzotriazole compounds represented by the general formula III in which R 7 represents a methyl group and R 8 and R 9 each represents a 2-ethylhexyl group.
- the content of the benzotriazole compound present in the grease composition of the present invention preferably ranges from 0.1 to 10% by mass, more preferably 0.3 to 5% by mass and most preferably 0.5 to 3% by mass on the basis of the total mass of the grease composition.
- the grease composition of the present invention may comprise a corrosion inhibitor other than the foregoing benzotriazole compound, such as succinic acid compound, typical of an alkenyl succinic acid anhydride, and/or sulfonic acid compound represented by an alkyl naphthalene-sulfonic acid in combination with the triazole type one and the amount thereof to be used is desirably not more than 5.0% by mass on the basis of the total mass of the grease composition.
- a corrosion inhibitor other than the foregoing benzotriazole compound such as succinic acid compound, typical of an alkenyl succinic acid anhydride, and/or sulfonic acid compound represented by an alkyl naphthalene-sulfonic acid in combination with the triazole type one and the amount thereof to be used is desirably not more than 5.0% by mass on the basis of the total mass of the grease composition.
- Lithium soap (lithium 12-hydroxy-stearate)
- Dioctyl sebacate Kinematic viscosity (at 40° C.): 12 mm 2 /s.
- Benzotriazole compound (a mixture comprising 1-[N,N-bis(2-ethylhexyl)-aminomethyl]-4-methyl benzotriazole and 1-[N,N-bis(2-ethylhexyl)-aminomethyl]-5-methyl benzotriazole);
- Phenolic compound (octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate);
- Succinic acid compound (alkenyl succinic acid anhydride).
- a candidate grease composition was applied onto the lower half of the surface of a copper sheet, a brass sheet or tin-plated sheet, in a thickness of 2 mm, followed by allowing each sheet to stand at 60° C., 80% RH for 168 hours and the subsequent confirmation of whether each test material underwent any external color change or not.
- the corrosion resistance of each test material was evaluated according to the following evaluation criteria:
- test material is not subjected to any corrosion
- A represents the volume of each elastomer observed prior to the immersion test and B the volume thereof observed after the immersion test.
- Each sample was evaluated on the basis of the following criteria:
- the sample elastomer has a volume change of less than ⁇ 10%
- the sample elastomer has a volume change of not less than ⁇ 10%.
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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)
Abstract
Description
- The present invention relates to a grease composition for use in a harness.
- In various automotive engine accessories, in particular, harness members arranged in the proximity to an air conditioner, the condensed water originated from, for instance, the moisture present in the atmosphere may penetrate into, for instance, a connector to thus corrode metallic parts constituting the same (materials for contact parts) and therefore, these metallic parts should certainly be protected from such corrosion. In addition, a lubricant (a grease composition obtained by adding a thickening agent to a base oil and then forming the resulting blend into a semi-solid product) should satisfy, for instance, the following requirements: it should have excellent corrosion resistance and oxidation stability in order that these parts can be used over a long period of time or in order to extend the service life of the parts. Furthermore, olefinic elastomers have recently been substituted for the polyvinyl chloride as a coating material for metallic parts for the purpose of reducing the quantity of materials which may not be environment-friendly and accordingly, it has been desired to design such a grease composition while taking into consideration the compatibility thereof with the coating materials for such parts.
- Conventionally, as a grease composition for filling up the distributing wire connector of a wire harness used for automobiles, there has been reported a grease composition having excellent heat resistance (Patent Document 1: JP-B-6-99702). However, this grease composition employs a purified mineral oil as a base oil and therefore, this grease composition is considered to have low compatibility with, for instance, olefinic elastomers and this composition is not designed to take into sufficient consideration the corrosion resistance and the oxidation stability.
- In addition, there has also been reported a grease composition for use in a speed-reducing device (gear), which is excellent in the anticorrosive properties and which does not adversely affect materials such as rubber materials too much (Patent Document 2: JP-A-4-266995; Patent Document 3: JP-A-63-309591; and Patent Document 4: JP-A-64-29496). These grease compositions can satisfy the requirement for the compatibility with the coating materials for such parts, for instance, olefinic elastomers, but they are not always sufficient in the corrosion resistance and the oxidation stability.
- Accordingly, it is an object of the present invention to provide a grease composition for harnesses and more particularly to provide a grease composition for harnesses, which is excellent in the compatibility with the coating materials for parts of harnesses such as olefinic elastomers, the corrosion resistance and the resistance to oxidation.
- The inventors of this invention have thus conducted various studies to eliminate the foregoing drawbacks associated with the foregoing conventional techniques concerning grease compositions for, in particular, harnesses, have found that the foregoing drawbacks can efficiently be eliminated by the use of a base oil containing a specific component and specific compounds as additives for the grease composition and have thus completed the present invention.
- According to the present invention, there is thus provided a grease composition for use in harnesses, which comprises a thickening agent, a base oil and additives, wherein the base oil comprises a polyoxyalkylene glycol ether and the additives comprise a quinoline compound and a benzotriazole compound.
- In a preferred embodiment of the grease composition for use in harnesses according to the present invention, the thickening agent is at least one member selected from the group consisting of lithium soaps and bentonite materials modified with organic compounds (organically modified bentonite materials).
- In a further preferred embodiment of the grease composition for use in harnesses according to the present invention, the polyoxyalkylene glycol ether has a kinematic viscosity as determined at a temperature of 40° C. ranging from 30 to 400 mm2/s.
- In a still further preferred embodiment of the grease composition for use in harnesses according to the present invention, the content of the quinoline compound ranges from 0.1 to 10% by mass on the basis of the total mass of the grease composition, and the content of the benzotriazole compound ranges from 0.1 to 10% by mass on the basis of the total mass of the grease composition.
- The grease composition of the present invention makes use of a polyoxyalkylene glycol ether-containing base oil and comprises, as additives, a quinoline compound and a benzotriazole compound and therefore, the grease composition is excellent in the compatibility with the coating materials for parts of harnesses such as olefinic elastomers, the corrosion resistance and the resistance to oxidation.
- The grease composition of the present invention is characterized in that it uses, as a base oil, one containing a polyoxyalkylene glycol ether, which does not adversely affect the olefinic materials too much. Preferably used in the present invention are polyoxyalkylene glycol ethers represented by the following general formula I:
R1O—(CH2CHR2O)n—R3 Formula I - In Formula I, R1 and R3 each independently represents a hydrogen atom or an alkyl group having 1 to 20, preferably 1 to 6 carbon atoms (such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a pentyl group or a hexyl group); R2 represents an alkyl group having 1 to 10, preferably 1 to 4 carbon atoms (such as a methyl group, an ethyl group, a propyl group or a butyl group); and n represents a numeral ranging from 5 to 30 and preferably 8 to 20, provided that R1 and R3 do not simultaneously represent hydrogen atoms.
- Specific examples of the polyoxyalkylene moieties of the polyoxyalkylene glycol ethers represented by the general formula I include polyoxyethylene, polyoxypropylene, poly(oxypropylene-oxyethylene), poly(oxybutylene-oxyethylene), poly(oxybutylene-oxypropylene), poly(oxypentylene-oxyethylene) and poly(oxypentylene-oxypropylene).
- The polyoxyalkylene glycol ethers represented by the general formula I usable herein may be a mono-ether or a di-ether and specific examples thereof include polyoxypropylene monopropyl ether, polyoxypropylene monobutyl ether, polyoxybutylene monobutyl ether, polyoxyethylene oxypropylene monopropyl ether, polyoxyethylene oxypropylene monobutyl ether, polyoxyethylene oxypropylene monopentyl ether, and polyoxypropylene dimethyl ether. Preferred are polyoxypropylene monobutyl ether, and polyoxypropylene dimethyl ether, most preferred is polyoxypropylene dimethyl ether.
- Preferably, the base oil used in the present invention comprises a polyoxyalkylene glycol ether in an amount of preferably not less than 50% by mass, more preferably not less than 80% by mass and most preferably 100% by mass on the basis of the total mass of the base oil. The base oil used in the present invention may further comprise other base oil materials currently used in the grease composition such as mineral oils, synthetic hydrocarbon oils, and alkyl diphenyl ether oils in addition to the polyoxyalkylene glycol ether, but the amount thereof is preferably less than 10% by mass on the basis of the total mass of the base oil.
- The kinematic viscosity of the polyoxyalkylene glycol ether as determined at 40° C. preferably ranges from 30 to 400 mm2/s and more preferably 80 to 120 mm2/s.
- As the thickening agent used in the grease composition for harnesses according to the present invention, there may be listed, for instance, those conventionally known in this art such as metal salts of fatty acids, bentonite modified with organic compounds and PTFE, with metal salts of fatty acids and bentonite modified with organic compounds being particularly preferably used herein.
- As the constituent fatty acids of the foregoing metal salts of fatty acids, preferably used herein are those having 10 to 30 and more preferably 16 to 20 carbon atoms and examples thereof preferably used herein are lauric acid, myristic acid, palmitic acid, stearic acid, 12-hydroxy stearic acid and oleic acid. Moreover, as the metal salts of these fatty acids, there may be mentioned, for instance, alkali metal salts such as sodium and lithium salts, alkaline earth metal salts such as barium and calcium salts and trivalent metal salts such as aluminum salts. Usable herein further include, for instance, salts of mixtures each comprising at least two fatty acids including dibasic acids with metals such as aluminum, calcium and lithium, or complex metallic soaps. Among these metal salts of fatty acids, most preferably used herein is lithium 12-hydroxy stearate because of its excellent water resistance, heat resistance and mechanical stability.
- The amount of the thickening agent to be incorporated into the grease composition of the present invention preferably ranges from 2 to 35 parts by mass and more preferably 5 to 15 parts by mass per 100 parts by mass of the base oil. This is because, if the amount thereof is less than 2 parts by mass, there would be observed such a tendency that the resulting grease composition is in a highly fluidized state and it is thus too soft, while if the amount thereof exceeds 35 parts by mass, the resulting composition is liable to be too hard to use as a grease composition for harnesses.
-
- In Formula II, R4, R5 and R6 may be the same or different and each preferably represents an alkyl group preferably having 1 to 10 and more preferably 1 to 3 carbon atoms and n is a numeral preferably ranging from 1 to 10 and more preferably 1 to 5.
- Particularly preferred such quinoline compounds are, for instance, trimethyl dihydro-quinoline oligomers (n=2 to 3).
- The amount of these quinoline compounds to be incorporated into the grease composition of the present invention preferably ranges from 0.1 to 10% by mass, more preferably 0.5 to 5% by mass and most preferably 1.0 to 3% by mass on the basis of the total mass of the grease composition.
- The grease composition of the present invention may further comprise other anti-oxidants, for instance, a phenolic compound such as 2,6-di-t-butyl cresol and/or an amine compound such as phenyl-α-naphthyl-amine, in combination with the foregoing components. In this respect, the content thereof used herein is desirably not more than 5.0% by mass on the basis of the total mass of the grease composition.
-
- In Formula III, R7 represents a hydrogen atom or an alkyl group having 1 to 10 and preferably 1 to 3 carbon atoms such as a methyl, ethyl or propyl group, R8 and R9 each independently represents a hydrogen atom or an alkyl group having 1 to 20 and preferably 1 to 10 carbon atoms such as a methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, hexyl, heptyl or octyl group. Particularly preferably used herein are, for instance, benzotriazole compounds represented by the general formula III in which R7 represents a methyl group and R8 and R9 each represents a 2-ethylhexyl group.
- The content of the benzotriazole compound present in the grease composition of the present invention preferably ranges from 0.1 to 10% by mass, more preferably 0.3 to 5% by mass and most preferably 0.5 to 3% by mass on the basis of the total mass of the grease composition.
- The grease composition of the present invention may comprise a corrosion inhibitor other than the foregoing benzotriazole compound, such as succinic acid compound, typical of an alkenyl succinic acid anhydride, and/or sulfonic acid compound represented by an alkyl naphthalene-sulfonic acid in combination with the triazole type one and the amount thereof to be used is desirably not more than 5.0% by mass on the basis of the total mass of the grease composition.
- The present invention will hereunder be described in more detail with reference to the following non-limitative Examples and Comparative Examples, but the present invention is not restricted to these specific Examples at all.
- In these Examples, there were prepared a variety of grease compositions each comprising a thickening agent, a base oil and additives specifically listed below and then characteristic properties thereof were evaluated according to the methods detailed below:
- (Sample Grease Compositions)
- Thickening Agent:
- Lithium soap (lithium 12-hydroxy-stearate)
- Bentonite modified with an organic compound (organically modified bentonite)
- Base Oil:
- Polyoxypropylene dimethyl ether (n=20): Kinematic viscosity (at 40° C.): 95 mm2/s;
- Polyoxypropylene monobutyl ether (n=10): Kinematic viscosity (at 40° C.): 105 mm2/s;
- Dioctyl sebacate: Kinematic viscosity (at 40° C.): 12 mm2/s.
- Additives:
- Quinoline compound (trimethyl dihydro-quinoline oligomer);
- Benzotriazole compound (a mixture comprising 1-[N,N-bis(2-ethylhexyl)-aminomethyl]-4-methyl benzotriazole and 1-[N,N-bis(2-ethylhexyl)-aminomethyl]-5-methyl benzotriazole);
- Phenolic compound (octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate);
- Succinic acid compound (alkenyl succinic acid anhydride).
- 1. Test of Thin Film Under High Temperature and High Humidity Conditions (Test for Corrosion Resistance)
- A candidate grease composition was applied onto the lower half of the surface of a copper sheet, a brass sheet or tin-plated sheet, in a thickness of 2 mm, followed by allowing each sheet to stand at 60° C., 80% RH for 168 hours and the subsequent confirmation of whether each test material underwent any external color change or not. The corrosion resistance of each test material was evaluated according to the following evaluation criteria:
- ◯: The test material is not subjected to any corrosion;
-
- x: The test material is in fact subjected to corrosion.
2. Test for Oxidation Stability - Method for Determination: This was determined according to JIS K 2220. 12. (99° C., 100 hours) and was evaluated on the basis of the following evaluation criteria:
- ◯: Less than 50 kPa;
- x: Not less than 50 kPa.
- 3. Olefin-Immersion Test (Compatibility with Material)
- Polypropylene elastomer (having a size of 50 mm×5 mm×1 mm) was immersed in each sample grease composition (100 g) maintained at 80° C. for 96 hours and then each olefinic material was inspected for the volume change according to the following equation:
Volume Change(%)=100×(A−B)/A - In the equation, A represents the volume of each elastomer observed prior to the immersion test and B the volume thereof observed after the immersion test. Each sample was evaluated on the basis of the following criteria:
- ◯: The sample elastomer has a volume change of less than ±10%;
- x: The sample elastomer has a volume change of not less than ±10%.
- The results thus obtained are summarized in the following Tables 1 and 2:
TABLE 1 Ex. No. 1 2 3 4 5 6 Thickening Agent Lithium hydroxy-stearate 10.0 10.0 10.0 10.0 10.0 Organically modified 10.0 bentonite Base Oil Polyoxypropylene 89.0 86.0 86.0 80.0 86.0 dimethyl ether Polyoxypropylene 86.0 monobutyl ether Dioctyl sebacate Additives Quinoline compound 0.5 1.0 3.0 5.0 3.0 3.0 Phenolic compound Benzotriazole compound 0.5 3.0 1.0 5.0 1.0 1.0 Succinic acid compound Worked Penetration 280 280 280 280 280 280 Corrosion Resistance ◯ ◯ ◯ ◯ ◯ ◯ (60° C., 80% RH × 168 hr) Oxidation Stability ◯ ◯ ◯ ◯ ◯ ◯ (99° C. × 100 hr) Olefin-Immersion Test ◯ ◯ ◯ ◯ ◯ ◯ (80° C. × 96 hr) -
TABLE 2 Comp. Ex. No. 1 2 3 4 5 6 Thickening Agent Lithium hydroxy-stearate 10.0 10.0 10.0 10.0 10.0 Organically modified 10.0 bentonite Base Oil Polyoxypropylene 87.0 89.0 86.0 86.0 dimethyl ether Polyoxypropylene 86.0 monobutyl ether Dioctyl sebacate 86.0 Additives Quinoline compound 3.0 3.0 3.0 Phenolic compound 3.0 3.0 Benzotriazole compound 1.0 1.0 Succinic acid compound 1.0 1.0 1.0 Worked Penetration 280 280 280 280 280 280 Corrosion Resistance X X X X X X (60° C., 80% RH × 168 hr) Oxidation Stability ◯ X X ◯ ◯ X (99° C. × 100 hr) Olefin-Immersion Test ◯ ◯ ◯ ◯ X ◯ (80° C. × 96 hr) - The data listed in the foregoing Tables 1 and 2 clearly indicate that the grease compositions prepared in Examples 1 to 6 according to the present invention can provide excellent results in the test of thin film under high temperature and high humidity conditions, the test for oxidation stability and the olefin-immersion test, or that these grease compositions are quite excellent in the corrosion resistance, the oxidation stability and the compatibility with olefinic material, since the grease composition of the present invention comprises a polyoxyalkylene glycol ether as the base oil and a quinoline compound and a benzotriazole compound as the additives.
- On the contrary, the data listed in the foregoing Tables 1 and 2 likewise clearly indicate that the grease compositions prepared in Comparative Examples 1 and 4, which are free of any benzotriazole compound, are inferior in the corrosion resistance, that the grease compositions prepared in Comparative Examples 2 and 3, which are free of any quinoline compound, are insufficient in the corrosion resistance and the oxidation stability and that the grease composition prepared in Comparative Example 5, which makes use of dioctyl sebacate as the base oil and a succinic acid compound in place of the benzotriazole compound, are inferior in the corrosion resistance and the compatibility with olefinic material. Moreover, it is clear from the foregoing data that the grease composition prepared in Comparative Example 6 (a commercially available grease composition), which is free of the both quinoline type and benzotriazole compounds, is inferior in the both corrosion resistance and oxidation stability.
Claims (8)
Applications Claiming Priority (2)
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JP2005071455A JP2006249376A (en) | 2005-03-14 | 2005-03-14 | Grease composition for harness |
JP2005-071455 | 2005-03-14 |
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US20060205613A1 true US20060205613A1 (en) | 2006-09-14 |
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US11/368,681 Abandoned US20060205613A1 (en) | 2005-03-14 | 2006-03-07 | Grease composition for harnesses |
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US (1) | US20060205613A1 (en) |
JP (1) | JP2006249376A (en) |
DE (1) | DE102006011666A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009090238A1 (en) * | 2008-01-16 | 2009-07-23 | Shell Internationale Research Maatschappij B.V. | Method for preparing a lubricating composition |
CN102703165A (en) * | 2012-03-29 | 2012-10-03 | 上海东昊油品有限公司 | Bihexadecyl dimethyl ammonium chloride modified bentonite lubricating grease and preparation method thereof |
CN104479831A (en) * | 2014-12-29 | 2015-04-01 | 新乡市恒星化工有限责任公司 | Non-dripping heat-resisting lubricating grease, as well as preparation method and application thereof |
US10597598B2 (en) | 2015-08-10 | 2020-03-24 | Ntn Corporation | Grease composition and grease-sealed roller bearing |
CN112457902A (en) * | 2020-10-14 | 2021-03-09 | 纳拓润滑技术江苏有限公司 | Lubricating grease composition for overhead conductor and production process thereof |
Families Citing this family (3)
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CN102264877B (en) * | 2008-12-23 | 2014-12-10 | 瑞弗化工有限公司 | Refrigerant lubricant composition |
CN104350137A (en) | 2012-06-05 | 2015-02-11 | 吉坤日矿日石能源株式会社 | Grease composition |
CN113308289B (en) * | 2021-05-26 | 2022-05-31 | 安徽博洋润滑科技有限公司 | Lubricating grease for drill chuck and preparation method thereof |
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US4115284A (en) * | 1976-06-21 | 1978-09-19 | Nippon Oil Co., Ltd. | Brake grease compositions |
US4737299A (en) * | 1985-10-05 | 1988-04-12 | Texaco Technologie Europa Gmbh | Lubricating greases for high operating temperatures |
US4990272A (en) * | 1987-12-08 | 1991-02-05 | Kabushiki Kaisha Tokai Rika Denki Seisakusho | Grease composition |
US5156756A (en) * | 1990-04-23 | 1992-10-20 | Kabushiki Kaisha Tokai Rika Denki Seisakusho | Lubricant for an electrical sliding contactor |
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JPS5123666A (en) * | 1974-08-20 | 1976-02-25 | Matsushita Electric Ind Co Ltd | DENKISETSUTENYOJUNKATSUZAI |
JPS5123506A (en) * | 1974-08-21 | 1976-02-25 | Matsushita Electric Ind Co Ltd | DENKISETSUTENYOJUNKATSUZAI |
JPH0699702B2 (en) * | 1989-01-26 | 1994-12-07 | 住友電装株式会社 | Automotive wire harness wiring connector filling grease composition |
-
2005
- 2005-03-14 JP JP2005071455A patent/JP2006249376A/en active Pending
-
2006
- 2006-03-07 US US11/368,681 patent/US20060205613A1/en not_active Abandoned
- 2006-03-14 DE DE102006011666A patent/DE102006011666A1/en not_active Withdrawn
Patent Citations (4)
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US4115284A (en) * | 1976-06-21 | 1978-09-19 | Nippon Oil Co., Ltd. | Brake grease compositions |
US4737299A (en) * | 1985-10-05 | 1988-04-12 | Texaco Technologie Europa Gmbh | Lubricating greases for high operating temperatures |
US4990272A (en) * | 1987-12-08 | 1991-02-05 | Kabushiki Kaisha Tokai Rika Denki Seisakusho | Grease composition |
US5156756A (en) * | 1990-04-23 | 1992-10-20 | Kabushiki Kaisha Tokai Rika Denki Seisakusho | Lubricant for an electrical sliding contactor |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009090238A1 (en) * | 2008-01-16 | 2009-07-23 | Shell Internationale Research Maatschappij B.V. | Method for preparing a lubricating composition |
CN101910385A (en) * | 2008-01-16 | 2010-12-08 | 国际壳牌研究有限公司 | Method for preparing a lubricating composition |
US20110021392A1 (en) * | 2008-01-16 | 2011-01-27 | Alan Richard Wheatley | Method for preparing a lubricating composition |
CN102703165A (en) * | 2012-03-29 | 2012-10-03 | 上海东昊油品有限公司 | Bihexadecyl dimethyl ammonium chloride modified bentonite lubricating grease and preparation method thereof |
CN104479831A (en) * | 2014-12-29 | 2015-04-01 | 新乡市恒星化工有限责任公司 | Non-dripping heat-resisting lubricating grease, as well as preparation method and application thereof |
US10597598B2 (en) | 2015-08-10 | 2020-03-24 | Ntn Corporation | Grease composition and grease-sealed roller bearing |
CN112457902A (en) * | 2020-10-14 | 2021-03-09 | 纳拓润滑技术江苏有限公司 | Lubricating grease composition for overhead conductor and production process thereof |
Also Published As
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DE102006011666A1 (en) | 2006-09-21 |
JP2006249376A (en) | 2006-09-21 |
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