Classifications

• • 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
  • C10M111/00—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential
  • C10M111/04—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential at least one of them being a macromolecular organic compound
• • 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
  • C10M169/041—Mixtures of base-materials and additives the additives being macromolecular compounds 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
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/04—Ethers; Acetals; Ortho-esters; Ortho-carbonates
  • C10M2207/0406—Ethers; Acetals; Ortho-esters; Ortho-carbonates used as base material
• • 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
  • C10M2207/2805—Esters used as base material
• • 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
• • 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
  • C10M2207/283—Esters of polyhydroxy compounds
  • C10M2207/2835—Esters of polyhydroxy compounds used as base material
• • 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
  • C10M2207/285—Esters of aromatic polycarboxylic acids
  • C10M2207/2855—Esters of aromatic polycarboxylic acids used as base material
• • 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
  • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
  • C10M2209/084—Acrylate; Methacrylate
• • 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
  • C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
  • C10M2209/1045—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only used as base material
• • 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
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/01—Physico-chemical properties
  • C10N2020/04—Molecular weight; Molecular weight distribution
• • 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
  • C10N2030/02—Pour-point; 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
  • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• • 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
  • C10N2030/58—Elastohydrodynamic lubrication, e.g. for high compressibility layers
• • 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
  • C10N2040/02—Bearings
• • 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
• • 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 lubricating oil composition, more specifically, a lubricating oil composition applicable to a hydraulic device, a rotary device, a bearing, a gear and the like, and a device using the lubricating oil composition.
• Patent Literature 1 discloses a hydraulic fluid for a vibration suppression damper, the hydraulic fluid having a viscosity index of 110 or more and a pour point of minus 25 degrees C or less, and specifically containing poly ⁇ -olefin, polyol ester and polyether.
• Patent Literature 2 discloses a lubricating oil such as a compressor oil, a turbine oil and a hydraulic fluid, which is used for a lubricating system requiring a large working load, and contains alkyl diphenyl and alkyl diphenyl ether.
• An object of the invention is to provide a lubricating oil composition having a high density, a low viscosity and a high viscosity index, and a device using the lubricating oil composition.
• the invention provides a lubricating oil composition described below and a device using the lubricating oil composition.
• a lubricating oil composition having a high density and a high viscosity index can be provided. Accordingly, the lubricating oil composition of the invention is suitably applicable to devices such as a hydraulic device, a rotary device, a bearing and a gear.
• a lubricating oil composition according to an exemplary embodiment is provided by blending a compound (C) in a base oil containing a compound (A) and a compound (B) described below.
• the lubricating oil composition will be described below in detail.
• the compound (A) is an ester or an ether having two or more aromatic rings.
• the compound (B) is an ester or an ether having a kinematic viscosity at 40 degrees C of 12 mm 2 /s or less, a density at 15 degrees C of 0.9 g/cm 3 or more and a flash point of 100 degrees C or more.
• the compound (C) is a poly(meth)acrylate having a mass average molecular weight of 50000 or less.
• the compound (A) in the exemplary embodiment is an ester or an ether having two or more aromatic rings.
• a manufacturing method of the compound is not particularly limited. A variety of typical manufacturing methods for esterification or etherification are applicable.
• carboxylic acid carboxylic acid ester, carboxylic acid chloride or a derivative thereof, alcohol or a derivative thereof are used as the material.
• specific examples of usable dicarboxylic acid include oxalic acid, malonic acid, succinic acid, adipic acid, azelaic acid, sebacic acid and dodecanedioic acid.
• Specific examples of a usable carboxylic acid are benzoic acid, toluic acid, phenylacetic acid, phenoxyacetic acid, anisic acid, and salicylic acid.
• Examples of usable alcohol include phenol, cresol, xylenol, benzyl alcohol, phenethyl alcohol, phenoxyethanol, benzyl oxyethanol, diethylene glycol monobenzyl ether, and ethylene glycol monobenzyl ether.
• Examples of a substituent include an aromatic ring group optionally substituted by an alkyl group, a nitro group, a hydroxyl group or an alkoxy group.
• a material containing these substituents is typically used. However, when being substituted by an alkyl group, the material may be alkylated after esterification. Alternatively, an initially alkylated material may be used.
• An esterification catalyst is not particularly limited. Alternatively, no catalyst may be used for esterification.
• a manufacturing method of an ether compound is not limited to a typical Williamson synthesis method.
• a carboxylic acid having an ether bond such as phenoxyacetic acid, phenoxyethanol, benzyl oxyethanol and diethylene glycol monobenzyl ether, or alcohol having an ether bond may be used as a material for esterification.
• the compound (A) is preferably an ester represented by one of formulae (1), (2) and (3) below.
• n and m are each 0 or 1.
• p and q are each an integer of 0 to 3.
• X and Y are each an alkyl group having 1 to 30 carbon atoms that may include a cycloalkyl group or an aromatic group, a cycloalkyl group or an aromatic group having 5 to 12 carbon atoms, an alkyloxycarbonyl group having 2 to 30 carbon atoms that may include a cycloalkyl group or an aromatic group, or an alkylcarbonyloxy group having 2 to 30 carbon atoms that may include a cycloalkyl group or an aromatic group.
• n and m are each 0 or 1.
• p and q are each an integer of 0 to 3.
• X and Y are each an alkyl group having 1 to 10 carbon atoms.
• A is an alkylene group having 2 to 18 carbon atoms that may contain oxygen in a main chain and/or include a side chain.
• j, k, n and m are each 0 or 1.
• p and q are each an integer of 0 to 3.
• X and Y are each an alkyl group having 1 to 10 carbon atoms.
• Z is an alkylene group having 1 to 18 carbon atoms that may include a side chain.
• n or m is a natural number of 2 or more, a bulk modulus of elasticity may be unfavorably decreased. For this reason, a carboxylic acid ester in which n and m are 0 or 1 is preferably used.
• a kinematic viscosity may become excessively high.
• a carboxylic acid ester in which p and q are each an integer of 0 to 3 is preferably used.
• X and Y are each an alkyl group having 1 to 30 carbon atoms that may include a cycloalkyl group or an aromatic group, a cycloalkyl group or an aromatic group having 5 to 12 carbon atoms, an alkyloxycarbonyl group having 2 to 30 carbon atoms that may include a cycloalkyl group or an aromatic group, or an alkylcarbonyloxy group having 2 to 30 carbon atoms that may include a cycloalkyl group or an aromatic group.
• the kinematic viscosity may become excessively high.
• the kinematic viscosity may become excessively high and a low-temperature fluidity may be deteriorated.
• n or m is an integer of 2 or more, the bulk modulus of elasticity may be unfavorably decreased. For this reason, a carboxylic acid ester in which n and m are 0 or 1 is preferably used.
• X and Y are each an alkyl group having 1 to 10 carbon atoms.
• X and Y are each an alkyl group having 11 carbon atoms or more, the kinematic viscosity may become excessively high.
• A is an alkylene group having 19 carbon atoms or more, the kinematic viscosity may become excessively high.
• the bulk modulus of elasticity may be unfavorably decreased.
• a carboxylic acid ester in which j and k are 0 or 1 and n and m are an integer of 0 to 2 is preferably used.
• X and Y are each an alkyl group having 1 to 10 carbon atoms.
• X and Y are each an alkyl group having 11 carbon atoms or more, the kinematic viscosity may become excessively high.
• Z has 19 carbon atoms or more, the kinematic viscosity may become excessively high.
• a content of the compound (A) is preferably in a range of 40 mass% to 95 mass% of a total amount of the lubricating oil composition, more preferably in a range of 50 mass% to 95 mass%, further preferably in a range of 60 mass% to 95 mass%.
• the content of the compound (A) is less than 40 mass%, the density (bulk modulus of elasticity) may be hardly increased.
• the content of the compound (A) is more than 95 mass%, the kinematic viscosity is also hardly decreased even by mixing the compound (A) with the compound (B). Rather, the kinematic viscosity of the composition may be increased.
• the compound (B) is an ester or ether having a kinematic viscosity at 40 degrees C of 12 mm 2 /s or less, a density at 15 degrees C of 0.9 g/cm 3 or more and a flash point of 100 degrees C or more.
• the base oil in the exemplary embodiment can be provided by blending the compound (B) with the compound (A).
• the kinematic viscosity at 40 degrees C of the compound (B) is more than 12 mm 2 /s, it is difficult to obtain a predetermined performance of the lubricating oil composition described below even by mixing the compound (B) with the compound (A).
• the density at 15 degrees C of the compound (B) is less than 0.9 g/cm 3
• the base oil provided by mixing the compound (B) with the compound (A) may not have a high density (high bulk modulus of elasticity).
• the flash point of the compound (B) is less than 100 degrees C, the flash point of the resulting lubricating oil composition may be excessively low.
• Examples of the compound (B) include adipic acid diester of ethyleneglycolmonobutylether, adipic acid diester of diethyleneglycolmonobutylether, 2-ethyl hexanoic acid diester of triethyleneglycol, dibutyl sebacate, dioctyl adipate, dioctyl azelate, dioctyl sebacate, dimethyl phthalate, diethyl phthalate, tetraethyleneglycoldimethylether, and diethyl succinate.
• a content of the compound (B) is preferably in a range of 5 mass% to 60 mass% of the total amount of the lubricating oil composition, more preferably in a range of 5 mass% to 50 mass%, further preferably in a range of 5 mass% to 40 mass%.
• the kinematic viscosity may not be unfavorably decreased.
• the base oil provided by mixing the compound (B) with the compound (A) may have a low density (low bulk modulus of elasticity).
• a total amount of the components (A) and (B) is preferably 85 mass% or more of the base oil in terms of advantages of the invention, more preferably 87 mass% or more, further preferably 90 mass% or more.
• a ratio of the compound (A) to the compound (B) in the base oil is preferably in a range of 2 to 10 by a mass ratio ((A)/(B)), more preferably in a range of 2.1 to 9.5.
• the ratio is less than 2
• the base oil may have a low density (low bulk modulus of elasticity).
• the ratio is more than 10, the base oil may have a high kinematic viscosity.
• the compound (C) in the exemplary embodiment is a poly(meth)acrylate having a mass average molecular weight of 50000 or less.
• the compound (C) advantageously increases the viscosity index in the lubricating oil composition according to the exemplary embodiment.
• the mass average molecular weight is more than 50000, the molecular weight is significantly reduced by shear, so that the viscosity index of the composition is reduced by use of the composition for a long time.
• the mass average molecular weight is less than 10000, the viscosity index of the composition is not sufficiently improved.
• Examples of the poly(meth)acrylate include non-dispersed polymethacrylate and dispersed polymethacrylate.
• One of the poly(meth)acrylates may be used alone or a combination of two or more thereof may be used.
• a content of the compound (C) is preferably in a range of 1 mass% to 15 mass% of the total amount of the lubricating oil composition, more preferably in a range of 1 mass% to 10 mass%. When the content of the compound (C) is 1 mass% or more, the viscosity index of the composition is sufficiently improved. When the content of the compound (C) is 15 mass% or less, the kinematic viscosity of the composition can be reduced.
• the lubricating oil composition according to the exemplary embodiment is provided by blending the base oil containing the compound (A) and the compound (B) with the compound (C), and exhibits the kinematic viscosity at 40 degrees C in a range of 20 mm 2 /s to 40 mm 2 /s, the density at 15 degrees C of 1.1 g/cm 3 or more, the flash point of 200 degrees C or more, and the viscosity index of 100 or more.
• the fluidity of the lubricating oil composition is unfavorably excessively high. For instance, the liquid is easily leaked from a sealed part.
• the kinematic viscosity is more than 40 mm 2 /s, flow resistance is excessively high, which unfavorably increases consumption energy.
• the density at 15 degrees C is less than 1.1 g/cm 3
• the bulk modulus of elasticity is unfavorably excessively low.
• the flash point is less than 200 degrees C, danger of fire in a working site is unfavorably increased.
• the viscosity index of less than 100 shows an unfavorably high temperature-dependency of the viscosity.
• the lubricating oil composition according to the exemplary embodiment can contain various additives as needed.
• an antioxidant for instance, an antioxidant, a detergent dispersant, a friction reducer, a metal deactivator, a pour point depressant, an antiwear agent, an antifoaming agent, and an extreme pressure agent are usable as needed.
• the antioxidant examples include a phenol antioxidant such as 2,6-di-t-butyl-4-methylphenol and 4,4'-methylenebis-(2,6-di-t-butylphenol), an amine antioxidant such as alkylated diphenylamine, phenyl- ⁇ -naphthylamine and alkylated- ⁇ -naphthylamine, dialkylthiodipropionate, dialkyldithiocarbamate derivative (except for a metal salt), bis(3,5-di-t-butyl-4-hydroxybenzyl)sulfide, mercaptobenzothiazole, a reaction product of phosphorus pentasulfide and olefin and a sulfur antioxidant such as dicetyl sulfide.
• a phenol antioxidant such as 2,6-di-t-butyl-4-methylphenol and 4,4'-methylenebis-(2,6-di-t-butylphenol)
• an amine antioxidant such
• One of the antioxidants is used alone or a two or more thereof are used in combination.
• the phenol antioxidant, the amine antioxidant or zinc alkyldithio phosphate, and a mixture thereof are preferably used.
• a content of the antioxidant is preferably in a range of 0.1 mass% to 10 mass% of the total amount of the composition.
• the detergent dispersant is exemplified by alkenyl succinimide.
• a content of the detergent dispersant is preferably in a range of 0.1 mass% to 10 mass% of the total amount of the composition.
• metal deactivator examples include benzotriazole and thiadiazole, which are used either alone or in combination of two or more thereof.
• a content of the metal deactivator is preferably in a range of 0.1 mass% to 5 mass%.
• the pour point depressant is exemplified by a polymethacrylate.
• a content of the pour point depressant is preferably in a range of 0.5 mass% to 10 mass%.
• the antiwear agent is exemplified by zinc alkyldithiophosphate.
• a content of the antiwear agent is preferably in a range of 0.1 mass% to 10 mass%.
• antifoaming agent examples include a silicone compound and an ester compound, which may be used alone or in a combination of two or more.
• a content of the antifoaming agent is preferably in a range of 0.01 mass% to 1 mass%.
• the extreme pressure agent is exemplified by tricresyl phosphate.
• a content of the extreme pressure agent is preferably in a range of 0.1 mass% to 10 mass%.
• the lubricating oil composition of the exemplary embodiment is preferably applicable to various devices: hydraulic devices such as a construction machine, injection molding machine, press machine, crane, machining center, hydraulic continuously variable transmission, robot, machine tool, hydraulic circuit of a hydraulic device, servo hydraulic control circuit, damper, shock absorber, brake system, power steering and rolling machine; rotary devices such as a pump and a compressor; bearings such as a hydrostatic bearing, slide bearing and ball bearing; and gears such as a spur gear, bevel gear and worm gear.
• hydraulic devices such as a construction machine, injection molding machine, press machine, crane, machining center, hydraulic continuously variable transmission, robot, machine tool, hydraulic circuit of a hydraulic device, servo hydraulic control circuit, damper, shock absorber, brake system, power steering and rolling machine
• rotary devices such as a pump and a compressor
• bearings such as a hydrostatic bearing, slide bearing and ball bearing
• gears such as a spur gear, bevel gear and worm gear.
• the lubricating oil composition of the exemplary embodiment particularly exhibits a high-pressure hydraulic performance described below.
• the lubricating oil composition of the exemplary embodiment also exhibits a low-pressure hydraulic performance described below.
• the reactant was washed three times each by saturated saline and by 0.1 N aqueous sodium hydroxide and then dried by anhydrous magnesium sulfate (manufactured by Tokyo Chemical Industry Co., Ltd.: reagent). After magnesium sulfate was filtered, excessive methyl benzoate (material) was distilled to obtain 440 g of dibenzoate of polyethylene glycol 200.
• a base oil A-2 was synthesized in the same manner as in synthesis of the above base oil A-1, except for using 82 g of diethylene glycol (manufactured by Tokyo Chemical Industry Co., Ltd.: reagent), 34 g of dipropylene glycol (manufactured by Tokyo Chemical Industry Co., Ltd.: reagent) and 28 g of triethylene glycol (manufactured by Tokyo Chemical Industry Co., Ltd.: reagent) in place of 233 g of polyethylene glycol 200 (manufactured by Tokyo Chemical Industry Co., Ltd.: reagent).
• diethylene glycol manufactured by Tokyo Chemical Industry Co., Ltd.: reagent
• 34 g of dipropylene glycol manufactured by Tokyo Chemical Industry Co., Ltd.: reagent
• triethylene glycol manufactured by Tokyo Chemical Industry Co., Ltd.: reagent
• Adipic acid diester of diethylene glycol monobutyl ether (manufactured by Tokyo Chemical Industry Co., Ltd.: reagent)
• Adipic acid diester of ethylene glycol monobutyl ether (manufactured by Tokyo Chemical Industry Co., Ltd.: reagent)
• Tetraethylene glycol dimethyl ether manufactured by Tokyo Chemical Industry Co., Ltd.: reagent
• the base oil A-1 or A-2 was blended with the base oils B-1 to B-7 and PMA (manufactured by KURARAY CO., LTD.: polymethylmethacrylate LW1000P in a form of beads and having 33,500 of mass average molecular weight: compound (C)) at a predetermined ratio to be dissolved, thereby preparing sample oils. Properties of the samples oils are shown in Tables 2 and 3.
• the sample oils of Examples 1 to 7 shown in Table 2 were provided by blending (mixing) the base oils B-1 to B-7 with the base oil A-1 (a base material). Each of the sample oils exhibits a high viscosity index with a high density while the viscosity of the base oil A-1 is reduced.
• the sample oil of Comparative 1 which was provided by adding PMA only to the base oil A-1, exhibits a high kinematic viscosity and a low viscosity index.
• the sample oils of Examples 8 to 11 shown in Table 3 were provided by blending the base oils B-1 to B-5 with the base oil A-2 (the base material). Each of the sample oils keeps a high density and exhibits a high viscosity index while the viscosity of the base oil A-2 is reduced. On the other hand, the sample oil of Comparative 2, which was provided by adding PMA only to the base oil A-2, exhibits a high kinematic viscosity and a low viscosity index.
• each of the sample oils of Examples 1 to 11 is a composition having a high density (a high bulk modulus of elasticity) and a high viscosity index within a low density zone, from which advantages of the invention can be understood.

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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)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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Cited By (5)

Families Citing this family (6)

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• 2012
  • 2012-03-23 JP JP2012067763A patent/JP5925003B2/ja not_active Expired - Fee Related
• 2013
  • 2013-03-12 CN CN201380015552.3A patent/CN104204172A/zh active Pending
  • 2013-03-12 EP EP13764788.9A patent/EP2829594A4/fr not_active Withdrawn
  • 2013-03-12 US US14/384,085 patent/US20150057203A1/en not_active Abandoned
  • 2013-03-12 WO PCT/JP2013/056809 patent/WO2013141082A1/fr active Application Filing
  • 2013-03-12 KR KR20147025798A patent/KR20140136449A/ko not_active Application Discontinuation

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