WO2015025976A1 - 緩衝器用潤滑油組成物 - Google Patents
緩衝器用潤滑油組成物 Download PDFInfo
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- WO2015025976A1 WO2015025976A1 PCT/JP2014/072185 JP2014072185W WO2015025976A1 WO 2015025976 A1 WO2015025976 A1 WO 2015025976A1 JP 2014072185 W JP2014072185 W JP 2014072185W WO 2015025976 A1 WO2015025976 A1 WO 2015025976A1
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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
- C10M169/04—Mixtures of base-materials and additives
- C10M169/044—Mixtures of base-materials and additives the additives being a mixture of non-macromolecular and macromolecular compounds
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- 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
- C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
- C10M101/02—Petroleum fractions
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- 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
- C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
- C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
- C10M133/04—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M133/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
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- 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
- C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
- C10M137/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
- C10M137/04—Phosphate esters
- C10M137/10—Thio derivatives
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- 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
- C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
- C10M141/10—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic phosphorus-containing compound
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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
- C10M155/00—Lubricating compositions characterised by the additive being a macromolecular compound containing atoms of elements not provided for in groups C10M143/00 - C10M153/00
- C10M155/02—Monomer containing silicon
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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
- C10M161/00—Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
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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
- 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
- C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
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- 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
- C10M2203/102—Aliphatic fractions
- C10M2203/1025—Aliphatic fractions 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
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
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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
- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
- C10M2223/04—Phosphate esters
- C10M2223/045—Metal containing thio derivatives
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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
- C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
- C10M2229/02—Unspecified siloxanes; Silicones
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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
- C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
- C10M2229/04—Siloxanes with specific structure
- C10M2229/041—Siloxanes with specific structure containing aliphatic substituents
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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
- C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
- C10M2229/04—Siloxanes with specific structure
- C10M2229/05—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon
- C10M2229/051—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon containing halogen
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- 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
- C10N2010/00—Metal present as such or in compounds
- C10N2010/04—Groups 2 or 12
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- 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
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
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- 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
- C10N2030/18—Anti-foaming property
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- 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
- C10N2030/70—Soluble oils
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- 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
- C10N2040/08—Hydraulic fluids, e.g. brake-fluids
Definitions
- the present invention relates to a lubricating oil composition for a shock absorber, and more particularly to a lubricating oil composition for a shock absorber used for a shock absorber for a four-wheeled vehicle.
- a vehicle body such as a four-wheeled vehicle has a shock absorber (hereinafter sometimes referred to as a “shock absorber”) to alleviate vibrations caused by road surface unevenness and vibrations generated during sudden acceleration and braking.
- a built-in suspension is used.
- the structure of the shock absorber is basically a cylindrical structure utilizing the flow resistance of oil, and specifically, a hydraulic piston having a small hole is used.
- a bush serving as a bearing is provided at a sliding portion between the cylinder and the piston rod. In general, the bush is made of bronze.
- a lubricating oil composition for a shock absorber in which a phosphate ester is blended as an extreme pressure agent and a secondary amine is blended is also known.
- a lubricating oil composition cannot sufficiently reduce friction with respect to a bronze bush.
- Patent Document 2 it is also known that a tertiary amine is blended in a lubricating oil composition for a continuously variable transmission together with an extreme pressure agent composed of a phosphate ester and a metal compound such as a metal sulfonate. ing.
- a lubricating oil composition is used as it is for a shock absorber, the friction coefficient against a bronze bush cannot be sufficiently reduced.
- the present invention has been made in view of the above problems.
- a shock absorber having a bronze bush the friction to the bush is reduced while improving the wear resistance to the bush and the solubility in the base oil. It is an object of the present invention to provide a lubricating oil composition for a shock absorber that can be realized.
- R 1 and R 2 are each independently an aliphatic hydrocarbon group having 1 to 5 carbon atoms, and R 3 is an aliphatic hydrocarbon group having 12 to 24 carbon atoms.
- R 4 to R 7 are each independently a linear, branched or cyclic alkyl group having 1 to 24 carbon atoms, and a linear, branched or cyclic group having 1 to 24 carbon atoms. It is selected from cyclic alkenyl groups.
- R 1 and R 2 are each independently a linear, branched or cyclic alkyl group having 1 to 5 carbon atoms, and a linear or branched group having 1 to 5 carbon atoms.
- R 3 is a linear, branched or cyclic alkyl group having 12 to 24 carbon atoms, and a linear, branched or cyclic group having 12 to 24 carbon atoms.
- the lubricating oil composition for a shock absorber according to any one of the above (1) to (5), which is selected from alkenyl groups.
- the lubricating oil composition for shock absorbers as described.
- (11) The lubricating oil composition for a shock absorber according to any one of (1) to (10), wherein 0.01 to 3% by mass of (C) zinc dithiophosphate is contained.
- (12) The lubricating oil composition for a shock absorber according to any one of the above (1) to (11), which is a lubricating oil composition for a shock absorber for four wheels.
- a lubricating oil composition for a shock absorber that can achieve low friction with respect to the bush while improving the wear resistance to the bronze bush and the solubility in the base oil.
- the lubricating oil composition for shock absorbers of the present invention comprises (A) a base oil, (B) a tertiary amine, and (C) zinc dithiophosphate.
- A a base oil
- B a tertiary amine
- C zinc dithiophosphate
- Mineral oil and / or synthetic oil is used as the base oil in the lubricating oil composition for shock absorbers of the present invention.
- Mineral oils include paraffin-based mineral oils, intermediate-based mineral oils and naphthenic-based mineral oils obtained by ordinary refining methods such as solvent refining and hydrogenation refining, or waxes produced by the Fischer-Tropsch process (gas (Turi Liquid Wax) and mineral oil-based waxes.
- synthetic oils include hydrocarbon synthetic oils and ether synthetic oils.
- hydrocarbon-based synthetic oil examples include polybutene, polyisobutylene, 1-octene oligomer, 1-decene oligomer, ⁇ -olefin oligomer such as ethylene-propylene copolymer, or a hydride thereof, alkylbenzene, alkylnaphthalene, and the like.
- ether synthetic oils include polyoxyalkylene glycol and polyphenyl ether.
- one or more mineral oils and one or more synthetic oils may be used in combination.
- the kinematic viscosity of the base oil is not particularly limited. However, when the lubricating oil composition for a shock absorber according to the present invention is used, for example, as an automobile shock absorber oil, the kinematic viscosity at 40 ° C. is preferably 2 to 20 mm 2 / s, and 5 to 14 mm. 2 / s is more preferable. In addition, when using 2 or more types of mineral oil and / or synthetic oil, the said numerical value means dynamic viscosity of the base oil formed by mixing them.
- the content of the base oil (A) in the total amount of the lubricating oil composition for shock absorbers is preferably 80 to 99% by mass, and more preferably 90 to 96% by mass.
- the tertiary amine used in the lubricating oil composition for shock absorbers of the present invention is represented by the following general formula (I).
- R 1 and R 2 are each independently an aliphatic hydrocarbon group having 1 to 5 carbon atoms
- R 3 is an aliphatic hydrocarbon group having 12 to 24 carbon atoms.
- R 1 and R 2 are each independently a linear, branched or cyclic alkyl group having 1 to 5 carbon atoms, or a linear, branched or cyclic group having 1 to 5 carbon atoms, or A cyclic alkenyl group is preferred.
- R 1 and R 2 may be different from each other or the same, but are preferably the same.
- R 3 is preferably a linear, branched or cyclic alkyl group having 12 to 24 carbon atoms, or a linear, branched or cyclic alkenyl group having 12 to 24 carbon atoms.
- the carbon number of R 1 and R 2 should be small, preferably 1 or 2 carbon atoms, and most preferably 1 carbon atom.
- R 1 and R 2 are more preferably alkyl groups from the viewpoint of improving stability and the like and further reducing the friction coefficient.
- Specific examples of R 1 and R 2 include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a vinyl group, a propenyl group, a butenyl group, and a pentenyl group, which are linear or branched. Any of an annular shape may be used. Among these, a methyl group or an ethyl group is preferable, and a methyl group is most preferable.
- tertiary amines have problems such as poor solubility in base oil and insufficient reduction in the friction coefficient against bronze. From these viewpoints, the number of carbon atoms in R 3 is preferably 16 to 20, and more preferably 18.
- the (B) tertiary amine is preferably composed mainly of a tertiary amine having an R 3 of 16 to 20, and more preferably a tertiary amine having 18 carbon atoms. In addition, it means that it is 50 mass% or more with respect to (B) tertiary amine whole quantity, and that this content rate is 80 mass% or more, and 90 mass% or more is more preferable that it is a main component.
- R 3 is preferably an alkyl group.
- R 3 should be linear.
- the alkyl group of R 3 include dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group, heicosyl group, docosyl group, tricosyl group, tetracosyl group, These may be linear, branched or cyclic.
- alkenyl group examples include dodecenyl group, tridecenyl group, tetradecenyl group, pentadecenyl group, hexadecenyl group, heptadecenyl group, octadecenyl group, nonadecenyl group, icocenyl group, henicosenyl group, dococenyl group, tricocenyl group and tetracocenyl group. May be linear, branched or cyclic, and the position of the double bond is arbitrary.
- an octadecyl group such as a hexadecyl group and a stearyl group
- an octadecenyl group such as an oleyl group, an icosyl group, and the like
- a stearyl group is most preferable.
- Preferred specific compounds of tertiary amines include dimethyl monostearylamine, diethylstearylamine and the like.
- the tertiary amine is preferably contained in an amount of 0.01 to 3% by mass based on the total amount of the lubricating oil composition for the shock absorber. By setting it within the above range, the friction coefficient against bronze can be reduced with an appropriate amount of tertiary amine. From such a viewpoint, the tertiary amine is more preferably contained in an amount of 0.1 to 1.5% by mass with respect to the total amount of the lubricating oil composition for a shock absorber.
- the zinc dithiophosphate used in the present invention is represented by the following general formula (II).
- R 4 to R 7 are each independently a linear, branched or cyclic alkyl group having 1 to 24 carbon atoms, or a linear or branched group having 1 to 24 carbon atoms, A cyclic alkenyl group, which may be the same or different from each other, the same ones are preferred from the viewpoint of ease of production;
- the friction coefficient of the lubricating oil composition against bronze can be satisfactorily reduced, and the swing width in the wear test can be reduced to reduce the stickiness.
- R 4 to R 7 preferably have 6 to 10 carbon atoms. By setting the number of carbon atoms of zinc dithiophosphate within these ranges, the friction coefficient against bronze can be more effectively reduced. From such a viewpoint, it is more preferable to include an alkyl group or alkenyl group having 8 carbon atoms, and it is most preferable that all of R 4 to R 7 have 8 carbon atoms. R 4 to R 7 are preferably linear or branched, and more preferably alkyl groups from the viewpoint of stability and the like.
- alkyl group in R 4 to R 7 examples include methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, Examples include tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group, heicosyl group, docosyl group, tricosyl group, and tetracosyl group, which are linear, branched, or cyclic.
- alkenyl groups vinyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl Group, heptadecenyl group, octadecenyl group, nonadecenyl group, icocenyl group, henecocenyl group, dococenyl group, tricocenyl group, tetracocenyl group.
- a hexyl group, a heptyl group, an octyl group, a nonyl group, and a decyl group are preferable, but an octyl group such as a 2-ethylhexyl group is particularly preferable.
- (C) Zinc dithiophosphate is preferably contained in an amount of 0.01 to 3% by mass based on the total amount of the lubricating oil composition for the shock absorber. By setting it within the above range, it is possible to reduce friction against bronze and to improve wear resistance against bronze with an appropriate amount of zinc (C) zinc dithiophosphate. From such a viewpoint, it is more preferable that (C) zinc dithiophosphate is contained in an amount of 0.1 to 1.5% by mass based on the total amount of the lubricating oil composition for shock absorbers.
- the lubricating oil composition for shock absorbers of the present invention preferably contains (D) a silicone-based foaming agent.
- foaming can be generated in the lubricating composition for impactors not only in a low temperature environment but also in a high temperature environment.
- the silicone foaming agent is preferably polydimethylsiloxane. Polydimethylsiloxane is represented by the following general formula (III), for example. In the above formula (III), n is a positive integer corresponding to the viscosity.
- the 20 ° C. kinematic viscosity of the silicone-based foaming agent is preferably 0.5 to 15 mm 2 / s, more preferably 1 to 10 mm 2 / s, and 3 to 8 mm 2 / s. Is particularly preferred. By setting the viscosity within these ranges, a sufficient foaming effect can be achieved. Polydimethylsiloxane can be used alone or in combination of two or more.
- the silicone-based foaming agent is preferably contained in an amount of 0.001 to 0.1% by mass, and preferably 0.005 to 0.05% by mass, based on the total amount of the lubricating oil composition for shock absorbers. More preferred.
- the lubricating oil composition for shock absorbers of the present invention preferably contains (E) a silicone-based antifoaming agent in addition to the above-mentioned (D) silicone-based foaming agent.
- the silicone-based antifoaming agent is, for example, fluorinated polysiloxane.
- the lubricating oil composition for shock absorbers can generate foam with the same amount of foaming at both low and high temperatures by containing (E) silicone-based antifoaming agent in addition to (D) silicone-based foaming agent. The defoaming time can be appropriate.
- the fluorinated polysiloxane is represented by the following general formula (IV), for example.
- n is a positive integer corresponding to the viscosity.
- R 11 each independently represents a hydrocarbon group or a fluorinated hydrocarbon group, which may be the same as or different from each other.
- R 12 independently represents a hydrocarbon group or a fluorinated hydrocarbon group, and may be the same or different from each other, or may be the same or different for each repeating unit.
- at least one of the plurality of R 12 is a fluorinated hydrocarbon group.
- hydrocarbon group of R 11 and R 12 examples include those having about 1 to 10 carbon atoms, and specifically, an alkyl group such as a methyl group, an ethyl group, and a propyl group, and an aryl group such as a phenyl group.
- an alkyl group such as a methyl group, an ethyl group, and a propyl group
- an aryl group such as a phenyl group.
- a polyfluoroalkylmethylsiloxane which is a methyl group is preferable in terms of the defoaming effect.
- fluorinated hydrocarbon group examples include a fluoroalkyl group having 10 or less carbon atoms, and more specifically, a trifluoropropyl group and the like.
- the silicone antifoaming agent preferably has a kinematic viscosity at 20 ° C.
- the content of the (E) silicone antifoaming agent is preferably smaller than that of the (D) silicone foaming agent with respect to the total amount of the lubricating oil composition for the shock absorber, specifically, 0.0001 to 0.01 It is preferably contained by mass%, more preferably 0.0005 to 0.003 mass%.
- the mass ratio of (D) silicone-based foaming agent and (E) silicone-based antifoaming agent in the lubricating oil composition for shock absorbers is preferably 2 to 20 and more preferably 5 to 15 from the viewpoint of improving foaming characteristics.
- the lubricating oil composition for a shock absorber of the present invention contains the above (D) silicone-based foaming agent and (E) silicone-based antifoaming agent so that the foaming characteristics are within a predetermined range.
- the initial foaming amount at 20 ° C. and 120 ° C. measured by the measurement method described later is 100 to 150 ml.
- the defoaming time at 20 ° C. measured by the measurement method described later is preferably 100 to 150 seconds, and more preferably, the defoaming time at 100 ° C. is less than 50 seconds.
- the lubricating oil composition for a shock absorber of the present invention does not need to contain (D) a silicone-based foaming agent and (E) a silicone-based antifoaming agent.
- a silicone-based foaming agent for example, an antifoaming agent other than the above-described antifoaming agent is blended. May be.
- a viscosity index improver As an optional additive component, at least one selected from a viscosity index improver, a friction modifier, and a seal sour error is not impaired. You may contain suitably in the range. If desired, other additives conventionally used in shock absorber lubricating oil compositions, for example, antioxidants, ashless dispersants, metal detergents, rust inhibitors, metal deactivators, It may contain a pour point depressant.
- the content ratio of the optional component (F) to the total amount of the lubricating oil composition for the shock absorber is usually preferably 15% by mass or less, more preferably 3 to 10% by mass.
- viscosity index improver examples include polymethacrylate, dispersed polymethacrylate, olefin copolymer (for example, ethylene-propylene copolymer), dispersed olefin copolymer, styrene copolymer (for example, Styrene-diene hydrogenated copolymer and the like), and polymethacrylates are preferred.
- olefin copolymer for example, ethylene-propylene copolymer
- styrene copolymer for example, Styrene-diene hydrogenated copolymer and the like
- polymethacrylates examples include polymethacrylate, dispersed polymethacrylate, olefin copolymer (for example, ethylene-propylene copolymer), dispersed olefin copolymer, styrene copolymer (for example, Styrene-diene hydrogenated copolymer and the like), and polymethacrylates
- the friction modifier examples include partial ester compounds obtained by a reaction between a fatty acid and an aliphatic polyhydric alcohol.
- the fatty acid is preferably a fatty acid having a linear or branched hydrocarbon group having 6 to 30 carbon atoms, and the hydrocarbon group has more preferably 8 to 24 carbon atoms, particularly preferably 10 to 20 carbon atoms.
- fatty acids examples include saturated fatty acids such as caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, and lignoceric acid, myristoleic acid, palmitoleic acid, oleic acid, and Examples include unsaturated fatty acids such as linolenic acid, preferably oleic acid.
- the aliphatic polyhydric alcohol is a divalent to hexavalent alcohol, and examples thereof include ethylene glycol, glycerin, trimethylolpropane, pentaerythritol, sorbitol, and the like, and pentaerythritol and glycerin are preferable.
- These partial ester compounds may be used individually by 1 type, and may be used in combination of 2 types.
- Antioxidants include monocyclic phenolic antioxidants such as 2,6-di-tert-butyl-p-cresol and 2,6-di-tert-butyl-4-ethylphenol; 4,4′-methylenebis (2,6-di-tert-butylphenol), polycyclic phenolic antioxidants such as 2,2′-methylenebis (4-ethyl-6-tert-butylphenol); monoalkyls such as monooctyldiphenylamine and monononyldiphenylamine Diphenylamine compounds, 4,4'-dibutyldiphenylamine, 4,4'-dipentyldiphenylamine, 4,4'-dihexyldiphenylamine, 4,4'-diheptyldiphenylamine, 4,4'-dioctyldiphenylamine, 4,4'- Dialkyldiphenylamines such as dinonyldiphenylamine Compounds, polyalkyl
- Examples of the ashless dispersant include succinimides, boron-containing succinimides, benzylamines, boron-containing benzylamines, succinic esters, monovalent or divalent typified by fatty acids or succinic acid. Examples thereof include amides of carboxylic acids. Also, as the metal detergent, neutral metal sulfonate, neutral metal phenate, neutral metal salicylate, neutral metal phosphonate, basic sulfonate, basic phenate, basic salicylate, overbased sulfonate, overbased salicylate And overbased phosphonates.
- Examples of the rust inhibitor include metal sulfonates and succinates, and examples of the metal deactivator include benzotriazole and thiadiazole.
- the pour point depressant polymethacrylate having a weight average molecular weight of about 50,000 to 150,000 can be used.
- the lubricating oil composition for shock absorbers of the present invention preferably has a kinematic viscosity at 40 ° C. of 18 mm 2 / s or less, more preferably 2 to 15 mm 2 / s, from the viewpoint of low temperature fluidity.
- the lubricating oil composition for shock absorbers contains the predetermined (B) tertiary amine and (C) zinc dithiophosphate, so that the wear resistance against bronze and (B) the tertiary amine While improving the solubility with respect to the base oil, the friction coefficient with respect to bronze can be reduced.
- the lubricating oil composition for a shock absorber according to the present invention can be used for both a double-cylinder shock absorber and a single-cylinder shock absorber, and can also be used for either a four-wheel or a two-wheel shock absorber. In particular, it is suitably used for four wheels.
- the lubricating oil composition of the present invention can be particularly suitably used for a shock absorber in which at least an inner surface which is a sliding surface with a piston rod is a bush made of bronze such as phosphor bronze.
- the sliding surface of the piston rod with the bush is generally made of chrome by chrome plating or the like.
- the lubricating oil composition for shock absorbers of the present invention can be suitably used for industrial hydraulic fluids, construction machinery hydraulic fluids, and the like.
- Wear area A bronze wear test was performed using a Bowden reciprocating friction tester under the following test conditions to measure the wear area of bronze. Test conditions Temperature: 80 ° C., Load: 0.5 kgf, Speed: 5 mm / s, Amplitude: 10 mm, Test piece: Phosphor bronze sphere (sphere with a diameter of 12.7 mm) / Chrome plated plate (50 ⁇ 1000 ⁇ 5 mm), test Time: 30 minutes In addition, the friction coefficient ⁇ and the wear area were measured after a few drops of sample oil on the plate and acclimated (20 mm / s, 2 minutes). 4). Runout in Bronze Wear Test In the above bronze wear test, the runout of the coefficient of friction at the center position of the displacement was measured. 5.
- Solubility Various additives were added to the base oil at 60 ° C and mixed to prepare a shock absorber lubricating composition, and then the appearance after standing at room temperature (23 ° C) for 24 hours was observed. 6). Foaming characteristic evaluation test After each lubricating oil composition for shock absorbers was stirred by jet injection for 5 minutes, the foaming amount immediately after the stirring was stopped was taken as the initial foaming amount. The time until the bubbles disappeared was evaluated as the defoaming time. The foaming characteristics were evaluated under conditions of 20 ° C. and 100 ° C., respectively.
- Examples 1 and 2 and Comparative Examples 1 to 4 The lubricating oil compositions for shock absorbers of Examples 1 and 2 and Comparative Examples 1 to 4 shown in Table 1 were prepared and evaluated for the friction coefficient ⁇ , wear area, and solubility for bronze. * In Tables 1 and 2, “-” indicates not blended.
- Base oil 1 paraffinic mineral oil, 40 ° C.
- kinematic viscosity 9.067 mm 2 / s, viscosity index: 109, density (15 ° C.): 0.828 g / mm 3
- Tertiary amine 1 Dimethyl stearyl amine
- Tertiary amine 2 Diethyl stearyl amine zinc dithiophosphate: di-2-ethylhexyl dithiophosphate zinc silicone foam in which R 4 to R 7 are all 2-ethylhexyl in general formula (II) Agent: Polydimethylsiloxane fluorinated silicone-based antifoaming agent having a kinematic viscosity at 20 ° C.
- Fluorinated polysiloxane silicone-based antifoaming agent having a kinematic viscosity at 20 ° C. of 1000 mm 2 / s: 12200 mm 2 having a kinematic viscosity at 20 ° C. / S polydimethylsiloxane viscosity index improver: Polymethacrylate
- Examples 1-6 Next, as shown in Table 2, in addition to Examples 1 and 2, the shock absorber lubricating oil compositions of Examples 3 to 6 were prepared, and their solubility and foaming characteristics were evaluated.
- the lubricating oil composition for shock absorbers of the present invention can be used for various types of shock absorbers, for example, can be suitably used for both a double cylinder type shock absorber and a single cylinder type shock absorber. Although it can be used for other shock absorbers, it is particularly preferably used for four wheels.
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Abstract
Description
ショックアブソーバーは伸縮運動するとき、大きな横力が作用されることがあるが、その際、ブッシュにはフリクションが発生する。フリクションの発生は、乗り心地性能を悪化する要因となるので、フリクションの低減が求められている。
さらには、例えば、特許文献2には、リン酸エステルからなる極圧剤と金属スルフォネート等の金属化合物とともに、3級アミンが無段変速機用の潤滑油組成物に配合されることも知られている。しかし、このような潤滑油組成物をそのまま緩衝器用として使用しても、青銅製のブッシュに対する摩擦係数を十分に低減できるわけではない。
(1)(A)鉱油及び/又は合成油からなる基油と、(B)下記一般式(I)で示される3級アミンと、(C)下記一般式(II)で示されるジチオリン酸亜鉛とを含む緩衝器用潤滑油組成物。
(2)(D)シリコーン系発泡剤をさらに含む上記(1)に記載の緩衝器用潤滑油組成物。
(3)(D)シリコーン系発泡剤が、20℃動粘度が0.5~15mm2/sであるポリジメチルシロキサンである上記(2)に記載の緩衝器用潤滑油組成物。
(4)さらに、(E)シリコーン系消泡剤を含む上記(2)又は(3)に記載の緩衝器用潤滑油組成物。
(5)(E)シリコーン系消泡剤が、20℃動粘度が200~2000mm2/sであるフッ素化ポリシロキサンである上記(4)に記載の緩衝器用潤滑油組成物。
(6)一般式(I)においてR1及びR2が、それぞれ独立に、炭素数1~5の直鎖状、分岐状又は環状のアルキル基、及び炭素数1~5の直鎖状、分岐状又は環状のアルケニル基から選択されるとともに、R3が、炭素数12~24の直鎖状、分岐状又は環状のアルキル基、及び炭素数12~24の直鎖状、分岐状又は環状のアルケニル基から選択されるものである上記(1)~(5)のいずれかに記載の緩衝器用潤滑油組成物。
(7)一般式(I)において、R3が炭素数16~20の直鎖状、分岐状又は環状のアルキル基である上記(6)のいずれかに記載の緩衝器用潤滑油組成物。
(8)一般式(I)において、R3がステアリル基である上記(7)に記載の緩衝器用潤滑油組成物。
(9)(B)3級アミンが0.01~3質量%含有される上記(1)~(8)のいずれかに記載の緩衝器用潤滑油組成物。
(10)一般式(II)において、R4~R7がそれぞれ独立に炭素数6~10の直鎖状、分岐状又は環状のアルキル基である上記(1)~(9)のいずれかに記載の緩衝器用潤滑油組成物。
(11)(C)ジチオリン酸亜鉛が、0.01~3質量%含有される上記(1)~(10)のいずれかに記載の緩衝器用潤滑油組成物。
(12)四輪用緩衝器用潤滑油組成物である上記(1)~(11)のいずれかに記載の緩衝器用潤滑油組成物。
(13)一般式(I)において、R1及びR2がそれぞれ炭素数1又は2である上記(1)~(12)のいずれかに記載の緩衝器用潤滑油組成物。
本発明の緩衝器用潤滑油組成物は、(A)基油と、(B)3級アミンと、(C)ジチオリン酸亜鉛とを含むものである。以下、各成分について詳細に説明する。
本発明の緩衝器用潤滑油組成物における基油としては、鉱油及び/又は合成油が用いられる。
鉱油としては、溶剤精製、水添精製等の通常の精製法により得られた、パラフィン基系鉱油、中間基系鉱油及びナフテン基系鉱油等、あるいは、フィッシャートロプシュプロセス等により製造されるワックス(ガストゥリキッドワックス)や鉱油系ワックスを異性化することによって製造されるもの等が挙げられる。
合成油としては、炭化水素系合成油、エーテル系合成油等が挙げられる。炭化水素系合成油としては、例えばポリブテン、ポリイソブチレン、1-オクテンオリゴマー、1-デセンオリゴマー、エチレン-プロピレン共重合体等のα-オレフィンオリゴマー又はその水素化物、アルキルベンゼン、アルキルナフタレン等を挙げることができる。エーテル系合成油としては、ポリオキシアルキレングリコール、ポリフェニルエーテル等が挙げられる。
なお、基油としては、上記鉱油及び/又は上記合成油の一種のみを用いても良いが、二種以上を用いても良い。さらには、鉱油一種以上と合成油一種以上とを組み合わせて用いてもよい。
基油としては、これらの中でも添加剤の溶解性の観点から鉱油が好適である。
基油の動粘度は特に制限はないが、本発明の緩衝器用潤滑油組成物を例えば自動車のショックアブソーバー油として用いる場合、40℃の動粘度で2~20mm2/sが好ましく、5~14mm2/sがより好ましい。なお、鉱油及び/又は合成油の二種以上を用いた場合、前記数値は、それらを混合してなる基油の動粘度を意味する。
緩衝器用潤滑油組成物の全量における(A)基油の含有割合は、80~99質量%であることが好ましく、90~96質量%であることがより好ましい。
本発明の緩衝器用潤滑油組成物において使用される3級アミンは、以下の一般式(I)で示されるものである。
一般式(I)においてR1及びR2は、それぞれ独立に炭素数1~5の直鎖状、分岐状、若しくは環状のアルキル基、又は炭素数1~5の直鎖状、分岐状、若しくは環状のアルケニル基であることが好ましい。R1及びR2は、互いに異なってもよいし、同一であっても良いが、同一であることが好ましい。また、R3は、炭素数12~24の直鎖状、分岐状、若しくは環状のアルキル基、又は炭素数12~24の直鎖状、分岐状、若しくは環状のアルケニル基であることが好ましい。
具体的には、R1及びR2は、メチル基、エチル基、プロピル基、ブチル基、ペンチル基、ビニル基、プロペニル基、ブテニル基、ペンテニル基が挙げられ、これらは直鎖状、分岐状、環状のいずれでもよい。これらの中ではメチル基又はエチル基が好ましく、メチル基が最も好ましい。
なお、(B)3級アミンは、R3が16~20である3級アミンが主成分であることが好ましく、炭素数18である3級アミンが主成分であることがより好ましい。なお、主成分であるとは、(B)3級アミン全量に対して50質量%以上含むことを意味し、この含有割合は80質量%以上が好ましく、90質量%以上がより好ましい。
また、安定性を高め、摩擦係数をより低下させるためには、R3はアルキル基であることが好ましい。また、R3は直鎖状であったほうがよい。
R3のアルキル基としては、ドデシル基、トリデシル基、テトラデシル基、ペンタデシル基、ヘキサデシル基、ヘプタデシル基、オクタデシル基、ノナデシル基、イコシル基、ヘンイコシル基、ドコシル基、トリコシル基、テトラコシル基が挙げられ、これらは直鎖状、分岐状、環状のいずれでもよい。また、アルケニル基としては、ドデセニル基,トリデセニル基,テトラデセニル基,ペンタデセニル基,ヘキサデセニル基,ヘプタデセニル基,オクタデセニル基,ノナデセニル基,イコセニル基,ヘンイコセニル基,ドコセニル基,トリコセニル基,テトラコセニル基を挙げられ、これらは直鎖状、分岐状、環状のいずれでもよく、二重結合の位置も任意である。
これらの中では、ヘキサデシル基、ステアリル基等のオクタデシル基、オレイル基等のオクタデセニル基、又はイコシル基等が好ましいが、ステアリル基が最も好ましい。
また、(B)3級アミンの好ましい具体的な化合物としては,ジメチルモノステアリルアミン、ジエチルステアリルアミン等が挙げられる。
本発明において使用されるジチオリン酸亜鉛は、以下の一般式(II)で示されるものが使用される。
本発明においては、3級アミンとともに、上記のジチオリン酸亜鉛を使用することで、潤滑油組成物の青銅に対する摩擦係数を良好に低下させることができるとともに、摩耗試験における振れ幅を小さくしてステッィクスリップ等を防止し、乗り心地性能をより良好にすることができる。
一般式(II)において、R4~R7の炭素数は、6~10であることが好ましい。ジチオリン酸亜鉛の炭素数をこれら範囲にすることで、青銅に対する摩擦係数をより有効に低減させることができる。そのような観点から炭素数8のアルキル基又はアルケニル基を含むことがより好ましく、R4~R7の全てが炭素数8であることも最も好ましい。また,R4~R7は、直鎖状又は分岐状であったほうが良く、さらには、安定性等の観点からアルキル基であったほうがよい。
R4~R7におけるアルキル基としては、メチル基、エチル基、プロピル基、ブチル基、ペンチル基、ヘキシル基、ヘプチル基、オクチル基、ノニル基、デシル基、ウンデシル基、ドデシル基、トリデシル基、テトラデシル基、ペンタデシル基、ヘキサデシル基、ヘプタデシル基、オクタデシル基、ノナデシル基、イコシル基、ヘンイコシル基、ドコシル基、トリコシル基及びテトラコシル基が挙げられ、これらは直鎖状、分岐状、環状のいずれであってもよい。また、アルケニル基としては、ビニル基、プロペニル基、ブテニル基、ペンテニル基、ヘキセニル基、ヘプテニル基、オクテニル基、ノネニル基、デセニル基、ウンデセニル基、ドデセニル基,トリデセニル基,テトラデセニル基,ペンタデセニル基,ヘキサデセニル基,ヘプタデセニル基,オクタデセニル基,ノナデセニル基,イコセニル基,ヘンイコセニル基,ドコセニル基,トリコセニル基,テトラコセニル基が挙げられる。これらは直鎖状、分岐状、環状のいずれであってもよく、二重結合の位置も任意である。
これらの中では、ヘキシル基、ヘプチル基、オクチル基、ノニル基、デシル基が好ましいが、2-エチルヘキシル基等のオクチル基が特に好ましい。
本発明の緩衝器用潤滑油組成物は、好ましくは(D)シリコーン系発泡剤を含有する。
(D)シリコーン系発泡剤が配合されることにより、低温環境下のみならず、高温環境下においても衝撃器用潤滑組成物に泡立ちを発生させることができる。緩衝器用潤滑油組成物において、泡立ちが発生すると、その泡立ちのクッション性により乗り心地性能を良好にすることができる。
シリコーン系発泡剤は、ポリジメチルシロキサンが好ましい。ポリジメチルシロキサンは、例えば、以下の一般式(III)で表されるものである。
ポリジメチルシロキサンは、単独で、あるいは二種以上を組み合わせて使用することができる。
(D)シリコーン系発泡剤は、緩衝器用潤滑油組成物全量に対して、0.001~0.1質量%含有されることが好ましく、0.005~0.05質量%含有されることがより好ましい。
本発明の緩衝器用潤滑油組成物は、上記(D)シリコーン系発泡剤に加えて(E)シリコーン系消泡剤を含有することが好ましい。(E)シリコーン系消泡剤は、例えば、フッ素化ポリシロキサンである。
緩衝器用潤滑油組成物は、(D)シリコーン系発泡剤に加えて(E)シリコーン系消泡剤を含有することで、低温及び高温下いずれにおいても同じ泡立量で泡立ちを発生させることができ、その消泡時間も適切なものとすることができる。
フッ素化炭化水素基としては、炭素数10以下のフルオロアルキル基が挙げられ、より具体的にはトリフルオロプロピル基等が挙げられる。
(E)シリコーン系消泡剤は、その20℃動粘度が200~2000mm2/sであることが好ましく、500~1500mm2/sであることがより好ましい。
この粘度範囲となることで、発泡を抑制して、低温環境下及び高温環境下いずれにおいても泡立量を同程度にしやすくなる。
(E)シリコーン系消泡剤は、緩衝器用潤滑油組成物全量に対して、(D)シリコーン系発泡剤よりもその含有量が少ないほうが好ましく、具体的には、0.0001~0.01質量%含有されることが好ましく、0.0005~0.003質量%含有されることがより好ましい。また、緩衝器用潤滑油組成物中における(D)シリコーン系発泡剤と(E)シリコーン系消泡剤との質量比([(D)シリコーン系発泡剤の含有量]/[(E)シリコーン系消泡剤の含有量])は、発泡特性を良好にする観点から、2~20であることが好ましく、5~15であることがより好ましい。
また、後述する測定法により測定された20℃における消泡時間が100~150秒であることが好ましく、さらには、100℃における消泡時間が50秒未満であることが好ましい。消泡時間がこれら範囲となることで減衰力波形の乱れが発生しないという利点がある。
ただし、本発明の緩衝器用潤滑油組成物は、(D)シリコーン系発泡剤及び(E)シリコーン系消泡剤が含有される必要はなく、例えば上記した消泡剤以外の消泡剤が配合されてもよい。
本発明の緩衝器用潤滑油組成物には、(F)任意添加成分として、粘度指数向上剤、摩擦調整剤、シールスウエラーの中から選ばれる少なくとも1種を、本発明の目的が損なわれない範囲で適宜含有されてもよい。また、所望により、従来、緩衝器用潤滑油組成物に慣用されている他の添加剤、例えば、酸化防止剤、無灰系分散剤、金属系清浄剤、防錆剤、金属不活性化剤、流動点降下剤等を含有していてもよい。
緩衝器用潤滑油組成物全量に対する(F)任意添加成分の含有割合は、通常15質量%以下であることが好ましく、3~10質量%がより好ましい。
本発明の緩衝器用潤滑油組成物は、複筒型ショックアブソーバー、単筒型ショックアブソーバーのいずれにも使用可能であり、また、四輪、二輪のいずれのショックアブソーバーにも使用可能であるが、特に四輪用として好適に用いられる。
また、本発明の潤滑油組成物は、少なくともピストンロッドとの摺動面である内面がリン青銅等の青銅製のブッシュであるショックアブソーバーに特に好適に使用できる。
なお、ピストンロッドのブッシュとの摺動面は、一般的に、クロムメッキ等によりクロム製とされる。
さらに本発明の緩衝器用潤滑油組成物は、工業用油圧作動油や建機用作動油等にも好適に使用可能である。
なお、本発明における各物性の評価は、以下の方法で行った。
[評価方法]
1.動粘度
JIS K2283に準拠して測定した。
2.青銅に対する摩擦係数μ
バウデン式往復動摩擦試験機により,以下の試験条件で青銅に対する摩擦係数μを測定した。
試験条件
温度:80℃、荷重:0.5kgf、速度:0.2mm/s、振幅:10mm、テストピース:リン青銅球(径12.7mmの球)/クロムメッキ板(50×1000×5mm)
3.摩耗面積
バウデン式往復動摩擦試験機により,以下の試験条件で青銅摩耗試験を行い青銅の摩耗面積を測定した。
試験条件
温度:80℃、荷重:0.5kgf、速度:5mm/s、振幅:10mm、テストピース:リン青銅球(径12.7mmの球)/クロムメッキ板(50×1000×5mm)、試験時間:30分間
なお、上記摩擦係数μ、及び摩耗面積の測定は、プレートにサンプル油を数滴落として、慣らし後(20mm/s、2分)に行った。
4.青銅摩耗試験における振れ幅
上記の青銅摩耗試験において、変位の中央位置における摩擦係数の振れ幅の測定を行った。
5.溶解性
基油に各種添加剤を60℃にて添加し、混合して緩衝器用潤滑組成物を調整した後,室温(23℃)にて24時間静置後の外観を観察した。
6.泡立特性評価試験
各緩衝器用潤滑油組成物を5分間ジェット噴射にて撹拌した後、撹拌停止直後の泡立量を初期泡立量とした。また、その泡が消えるまでの時間を消泡時間として評価した。泡立特性の評価は、20℃、100℃の条件それぞれにおいて行った。
表1に示す実施例1、2、及び比較例1~4の緩衝器用潤滑油組成物を用意して、青銅に対する摩擦係数μ、摩耗面積、及び溶解性について評価した。
基油1:パラフィン系鉱油、40℃動粘度:9.067mm2/s、粘度指数:109、密度(15℃):0.828g/mm3
3級アミン1:ジメチルステアリルアミン
3級アミン2:ジエチルステアリルアミン
ジチオリン酸亜鉛:一般式(II)において、R4~R7の全てが2-エチルヘキシルであるジ2-エチルヘキシルジチオリン酸亜鉛
シリコーン系発泡剤:20℃動粘度が5mm2/sのポリジメチルシロキサン
フッ素化シリコーン系消泡剤:20℃動粘度が1000mm2/sのフッ素化ポリシロキサン
シリコーン系消泡剤:20℃動粘度が12500mm2/sのポリジメチルシロキサン
粘度指数向上剤:ポリメタクリレート系
次に、表2に示すように、実施例1、2に加えて、実施例3~6の緩衝器用潤滑油組成物を用意し、それらの溶解性、泡立特性について評価した。
また、表2の実施例1、2の結果から明らかなように、(D)シリコーン系発泡剤及び(E)シリコーン系消泡剤を配合することにより、初期発泡量が20℃、100℃いずれにおいても100~150mlの範囲となり、さらには、消泡時間が20℃、100℃それぞれにおいて100~150秒、50秒未満となり、良好な発泡特性を有していた。そのため、実施例1、2の緩衝器用潤滑油組成物は、発泡により乗り心地性能をさらに良好にできると理解できる。
Claims (13)
- (D)シリコーン系発泡剤をさらに含む請求項1に記載の緩衝器用潤滑油組成物。
- (D)シリコーン系発泡剤が、20℃動粘度が0.5~15mm2/sであるポリジメチルシロキサンである請求項2に記載の緩衝器用潤滑油組成物。
- さらに、(E)シリコーン系消泡剤を含む請求項2又は3に記載の緩衝器用潤滑油組成物。
- (E)シリコーン系消泡剤が、20℃動粘度が200~2000mm2/sであるフッ素化ポリシロキサンである請求項4に記載の緩衝器用潤滑油組成物。
- 一般式(I)においてR1及びR2が、それぞれ独立に、炭素数1~5の直鎖状、分岐状又は環状のアルキル基、及び炭素数1~5の直鎖状、分岐状又は環状のアルケニル基から選択されるとともに、R3が、炭素数12~24の直鎖状、分岐状又は環状のアルキル基、及び炭素数12~24の直鎖状、分岐状又は環状のアルケニル基から選択されるものである請求項1~5のいずれかに記載の緩衝器用潤滑油組成物。
- 一般式(I)において、R3が炭素数16~20の直鎖状、分岐状又は環状のアルキル基である請求項6に記載の緩衝器用潤滑油組成物。
- 一般式(I)において、R3がステアリル基である請求項7に記載の緩衝器用潤滑油組成物。
- (B)3級アミンが0.01~3質量%含有される請求項1~8のいずれかに記載の緩衝器用潤滑油組成物。
- 一般式(II)において、R4~R7がそれぞれ独立に炭素数6~10の直鎖状、分岐状又は環状のアルキル基である請求項1~9のいずれかに記載の緩衝器用潤滑油組成物。
- (C)ジチオリン酸亜鉛が、0.01~3質量%含有される請求項1~10のいずれかに記載の緩衝器用潤滑油組成物。
- 四輪用緩衝器用潤滑油組成物である請求項1~11のいずれかに記載の緩衝器用潤滑油組成物。
- 一般式(I)において、R1及びR2がそれぞれ炭素数1又は2である請求項1~12のいずれかに記載の緩衝器用潤滑油組成物。
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US14/910,893 US9745536B2 (en) | 2013-08-23 | 2014-08-25 | Lubricating oil composition for shock absorber |
CN201480046144.9A CN105492583B (zh) | 2013-08-23 | 2014-08-25 | 缓冲器用润滑油组合物 |
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JP7264616B2 (ja) * | 2018-10-26 | 2023-04-25 | Kyb株式会社 | 緩衝器用潤滑油組成物、緩衝器用潤滑油の摩擦調整用添加剤および潤滑油添加剤 |
FR3097875B1 (fr) * | 2019-06-28 | 2022-03-04 | Total Marketing Services | Composition lubrifiante pour prévenir la corrosion et/ou la tribocorrosion des pièces métalliques dans un moteur |
JP2022022721A (ja) * | 2020-07-02 | 2022-02-07 | 出光興産株式会社 | 潤滑油組成物、緩衝器、及び潤滑油組成物の使用方法 |
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JP7104576B2 (ja) | 2018-07-03 | 2022-07-21 | Eneos株式会社 | 潤滑油組成物 |
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US9745536B2 (en) | 2017-08-29 |
EP3037506A4 (en) | 2017-02-08 |
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JP6454278B2 (ja) | 2019-01-16 |
US20160186090A1 (en) | 2016-06-30 |
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CN105492583B (zh) | 2019-05-03 |
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JPWO2015025976A1 (ja) | 2017-03-02 |
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