EP2535398A1 - Composition d'huile lubrifiante - Google Patents

Composition d'huile lubrifiante Download PDF

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Publication number
EP2535398A1
EP2535398A1 EP10845798A EP10845798A EP2535398A1 EP 2535398 A1 EP2535398 A1 EP 2535398A1 EP 10845798 A EP10845798 A EP 10845798A EP 10845798 A EP10845798 A EP 10845798A EP 2535398 A1 EP2535398 A1 EP 2535398A1
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EP
European Patent Office
Prior art keywords
mass
lubricating oil
degrees
range
kinematic viscosity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10845798A
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German (de)
English (en)
Other versions
EP2535398A4 (fr
Inventor
Hiroshi Fujita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Idemitsu Kosan Co Ltd
Original Assignee
Idemitsu Kosan Co Ltd
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Filing date
Publication date
Application filed by Idemitsu Kosan Co Ltd filed Critical Idemitsu Kosan Co Ltd
Publication of EP2535398A1 publication Critical patent/EP2535398A1/fr
Publication of EP2535398A4 publication Critical patent/EP2535398A4/fr
Withdrawn legal-status Critical Current

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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
    • C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
    • C10M101/02—Petroleum fractions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/02—Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation
    • 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
    • C10M143/00—Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation
    • 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
    • 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
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
    • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms 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
    • C10M2207/281—Esters of (cyclo)aliphatic monocarboxylic acids
    • 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
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/28—Amides; Imides
    • 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
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/046—Overbasedsulfonic acid salts
    • 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
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/08—Thiols; Sulfides; Polysulfides; Mercaptals
    • 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
    • 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
    • C10M2223/047—Thioderivatives not containing metallic elements
    • 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
    • C10M2229/025—Unspecified siloxanes; Silicones 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
    • 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
    • C10M2229/0415—Siloxanes with specific structure containing aliphatic substituents 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
    • C10N2030/68—Shear stability
    • 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
    • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives

Definitions

  • the present invention relates to a lubricating oil composition.
  • a transmission i.e., a component of an automobile
  • fuel-saving methods of the transmission is lowering a viscosity of a lubricating oil.
  • the low-viscosity lubricating oil exhibits a low oil-film retention at high temperatures, thereby occasionally generating seizure, shortening a fatigue life and the like.
  • Patent Literature 1 reports a lubricating oil composition capable of maintaining a gear shifting performance for a long period of time, in which various additives are contained for optimization.
  • a kinematic viscosity of the lubricating oil composition is high and a fatigue life thereof when the viscosity is lowered has not been studied.
  • a lubricating oil composition having a viscosity index of about 150 to 250 is commercially available.
  • viscosity-index improvement has been demanded from the viewpoint of low-temperature startability.
  • a viscosity index of a lubricating oil composition disclosed in Patent Literature 2 is improved with polymethacrylate (PMA) as a viscosity index improver.
  • PMA polymethacrylate
  • a viscosity property is improved with a high-viscosity synthetic oil (poly-alpha-olefin: PAO) and an olefin copolymer (OCP) effective for improving a fatigue life is further contained.
  • PAO poly-alpha-olefin
  • OCP olefin copolymer
  • the lubricating oil composition contains the viscosity index improver in order to increase the viscosity at high temperatures, it is feared that abrasion and fatigue are caused by a large decrease in the viscosity at the time of shearing (i.e., a decrease in shear stability) and a consequent decrease in oil-film formability. Moreover, since fatigue-life improvement and viscosity-index improvement are in inverse proportion to each other, the lubricating oil composition of Patent Literature 2 has a poor oil-film retention whereas having an improved viscosity index.
  • Patent Literatures 3 and 4 although OCP is blended in the lubricating oil composition, the lubricating oil composition does not exhibit the viscosity index that is equal to or exceeds the viscosity index of PAO. Thus, the viscosity-index improvement has not been studied. In other words, technique to improve the viscosity index while having a sufficient fatigue life has been neither realized nor studied.
  • an object of the invention is to provide a lubricating oil composition that is adapted to maintain a required shear stability, exhibit an excellent low-temperature viscosity property and a high fuel-saving performance, and maintain a fatigue life.
  • a lubricating oil composition contains (A) a base oil for a lubricating oil in a range of 5 mass% to 70 mass% based on a total amount of the composition, the base oil containing a sulfur content of 0.03 mass% or less and having a kinematic viscosity at 100 degrees C in a range of 0.5 mm 2 /s to 1.5 mm 2 /s, and (B) a poly-alpha-olefin in a range of 15 mass% to 30 mass% based on the total amount of the composition, the poly-alpha-olefin having a kinematic viscosity at 100 degrees C of 150 mm 2 /s or more.
  • the lubricating oil composition according to the above aspect of the invention further contains silicone oil having a kinematic viscosity at 100 degrees C in a range of 0.5 mm 2 ls to 4 mm 2 /s .
  • the lubricating oil composition according to the above aspect of the invention further contains a polymethacrylate having a mass average molecular weight (Mw) of 100000 or more.
  • the lubricating oil composition according to the above aspect of the invention further contains a poly-alpha-olefin having a kinematic viscosity at 100 degrees C in a range of 1.5 mm 2 /s to 2.5 mm 2 /s.
  • the kinematic viscosity at 100 degrees C of the component (A) is in a range of 0.7 mm 2 /s to 1.3 mm 2 /s
  • the kinematic viscosity at 100 degrees C of the component (B) is in a range of 150 mm 2 /s to 400 mm 2 /s
  • the lubricating oil composition further containing: a polymethacrylate having a mass average molecular weight of 300000 or more in a range of 0.1 mass% to 5.0 mass% based on the total amount of the composition; and a poly-alpha-olefin having the kinematic viscosity at 100 degrees C in a range of 1.7 mm 2 /s to 2.1 mm 2 /s in a range of 0.1 mass% to 60 mass% based on the total amount of the composition.
  • the lubricating oil composition is used for a transmission.
  • a lubricating oil composition maintaining shear stability on the conventional level and exhibiting an excellent low-temperature viscosity property can be provided. Moreover, when the lubricating oil composition is used as a lubricating oil for a transmission and the like, fuel-saving property is high and a fatigue life is maintainable.
  • a lubricating oil composition of the invention contains the aforementioned components. The invention will be described below in detail.
  • the lubricating oil composition according to the invention contains a base oil for a lubricating oil in a range of 5 mass% to 70 mass% based on the total amount of the composition as the component (A), in which the base oil contains a sulfur content of 0.03 mass% or less and has a kinematic viscosity at 100 degrees C in a range of 0.5 mm 2 /s to 1.5 mm 2 /s, preferably of 0.7 mm 2 /s to 1.3 mm 2 /s.
  • the sulfur content in the component (A) exceeds 0.03 mass%, oxidation stability is deteriorated.
  • a lubricating oil composition is decreased when the content of the base oil is less than 5 mass%.
  • the viscosity thereof is decreased when the content of the base oil exceeds 70 mass%. Accordingly, such a lubricating oil composition is not preferable for use in a transmission since abrasion of mechanical components may be increased.
  • the mineral oil is preferably usable because of its lower viscosity.
  • the mineral oil is subject to no limitation as long as being generally usable as the base oil for the lubricating oil for the transmission.
  • Preferable examples of the mineral oil include paraffinic and naphthenic base oils which can be obtained by subjecting a lubricating oil fraction produced by atmospheric- and vacuum-distillation of a crude oil, to any suitable combination of refining processes including solvent-deasphalting, solvent-extracting, hydrocracking, solvent-dewaxing, catalytic-dewaxing, hydrorefining, sulfuric acid treatment and clay treatment.
  • the mineral oil and synthetic oil having the kinematic viscosity at 100 degrees C in the above range may be used alone or in a mixture of two or more selected from the mineral oil and synthetic oil at any rate.
  • the lubricating oil composition according to the invention contains a poly-alpha-olefin in a range of 15 mass% to 30 mass% based on the total amount of the composition as the component (B), in which the poly-alpha-olefin has a kinematic viscosity at 100 degrees C of 150 mm 2 /s or more, preferably in a range of 150 mm 2 /s to 400 mm 2 /s.
  • the kinematic viscosity at 100 degrees C is less than 150 mm 2 /s, the viscosity index is decreased. Accordingly, the lubricating oil composition is not preferable for use in a transmission since abrasion of mechanical components may be increased.
  • the viscosity index of the finished oil is decreased when the content of the poly-alpha-olefin is less than 15 mass%. Accordingly, the finished oil is not preferable for use in a transmission since abrasion of mechanical components may be increased. When the content of the poly-alpha-olefin exceeds 30 mass%, the viscosity may be increased to unfavorably increase friction loss.
  • the lubricating oil composition according to the invention may contain the components (A) and (B), thereby maintaining shear stability on the conventional level and exhibiting an excellent low-temperature viscosity property.
  • the lubricating oil composition according to the invention further contains the following components, thereby enhancing the low-temperature viscosity property.
  • silicone oil When silicone oil is blended, it is preferable to use silicone oil having a kinematic viscosity at 100 degrees C in a range of 0.5 mm 2 /s to 4 mm 2 /s.
  • a flash point of the lubricating oil composition may be unfavorably significantly decreased when the kinematic viscosity at 100 degrees C is less than 0.5 mm 2 /s.
  • the viscosity index may be unfavorably decreased when the kinematic viscosity at 100 degrees C exceeds 4 mm 2 /s.
  • the content of the silicone oil is preferably in a range of 5 mass% to 50 mass% based on the total amount of the composition.
  • the silicone oil exhibits a poor solubility although exhibiting a high viscosity index.
  • the viscosity index of the lubricating oil composition is improvable without deteriorating the solubility thereof.
  • the silicone oil exceeds 50 mass%, the solubility of the lubricating oil composition is decreased, so that the silicone oil may be separated or precipitated.
  • the lubricating oil composition according to the invention further contains a polymethacrylate having a mass average molecular weight of 100000 or more.
  • the polymethacrylate may not provide a sufficient viscosity index improvability with the mass average molecular weight of less than 100000.
  • the content of the polymethacrylate is preferably in a range of 0.1 mass% to 5.0 mass% based on the total amount of the composition.
  • the polymethacrylate may not provide a sufficient viscosity index improvability with the content of less than 0.1 mass%.
  • the polymethacrylate may lower the shear stability of the lubricating oil composition with the content of more than 5.0 mass%.
  • the lubricating oil composition according to the invention further contains a poly-alpha-olefin preferably having a kinematic viscosity at 100 degrees C in a range of 1.5 mm 2 /s to 2.5 mm 2 /s, more preferably of 1.7 mm 2 /s to 2.1 mm 2 /s.
  • the vaporizability may be unfavorably increased when the kinematic viscosity at 100 degrees C is less than 1.5 mm 2 /s.
  • the viscosity of the lubricating oil composition may be increased to raise the friction loss when the kinematic viscosity at 100 degrees C exceeds 2.5 mm 2 /s.
  • the content of PAO is preferably in a range of 0.1 mass% to 60 mass% based on the total amount of the composition.
  • the viscosity index of the lubricating oil composition may be lowered when the content of PAO exceeds 60 mass%.
  • the lubricating oil composition according to the invention may be added as necessary with other additives such as a detergent, an ashless dispersant, an antiwear agent, a friction modifier, a rust inhibitor, a metal deactivator, an antifoaming agent, an antioxidant and a coloring agent, as long as advantages of the invention are not hampered.
  • additives such as a detergent, an ashless dispersant, an antiwear agent, a friction modifier, a rust inhibitor, a metal deactivator, an antifoaming agent, an antioxidant and a coloring agent, as long as advantages of the invention are not hampered.
  • the detergent is exemplified by a metal detergent such as a neutral metal sulfonate, a neutral metal phenate, a neutral metal salicylate, a neutral metal phosphonate, a basic sulfonate, a basic phenate, a basic salicylate, an overbased sulfonate, an overbased salicylate and an overbased phosphonate.
  • the content of the detergent is preferably approximately in a range of 0.01 mass% to 10 mass% based on the total amount of the composition.
  • Examples of the ashless dispersant include: succinimides; boron-containing succinimides; benzil amines; boron-containing benzil amines; succinates; and monovalent or divalent carboxylic amides represented by fatty acid or succinic acid.
  • the content of the ashless dispersant is preferably approximately in a range of 0.1 mass% to 20 mass% based on the total amount of the composition.
  • the antiwear agent examples include: a sulfur antiwear agent such as a salt of thiophosphoric acid and a metal (e.g., Zn, Pb, Sb) and a salt of thiocarbamic acid and a metal (e.g., Zn); and a phosphorus antiwear agent such as a phosphate ester (tricresyl phosphate).
  • a sulfur antiwear agent such as a salt of thiophosphoric acid and a metal (e.g., Zn, Pb, Sb) and a salt of thiocarbamic acid and a metal (e.g., Zn)
  • a phosphorus antiwear agent such as a phosphate ester (tricresyl phosphate).
  • the content of the antiwear agent is preferably approximately in a range of 0.05 mass% to 5 mass% based on the total amount of the composition.
  • the friction modifier is exemplified by a partial ester of polyhydric alcohol such as neopentyl glycol monolaurate, trimethylolpropane monolaurate, and glycerin monooleate (monoglyceride oleate).
  • the content of the friction modifier is preferably approximately in a range of 0.05 mass% to 4 mass% based on the total amount of the composition.
  • the rust inhibitor are a fatty acid, an alkenyl succinic acid half ester, a fatty acid soap, an alkyl sulfonate, a fatty acid ester of polyhydric alcohol, a fatty acid amide, an oxidized paraffin, and an alkyl polyoxyethylene ether.
  • the content of the rust inhibitor is preferably approximately in a range of 0.01 mass% to 3 mass% based on the total amount of the composition.
  • the metal deactivator include benzotriazole, a benzotriazole derivative, triazole, a triazole derivative, imidazole, an imidazole derivative and thiadiazole, which are used alone or in combination of two or more thereof.
  • the content of the metal deactivator is preferably approximately in a range of 0.01 mass% to 5 mass% based on the total amount of the composition.
  • the antifoaming agent examples include a silicone compound and an ester compound, which may be used alone or in a combination of two or more.
  • the content of the antifoaming agent is preferably approximately in a range of 0.05 mass% to 5 mass% based on the total amount of the composition.
  • the antioxidant include: a hindered phenolic antioxidant, an amine antioxidant, and zinc alkyldithiophosphate (ZnDTP).
  • ZnDTP zinc alkyldithiophosphate
  • a bisphenol antioxidant and an ester group-containing phenol antioxidant are particularly preferable as the phenolic antioxidant.
  • a dialkyldiphenylamine antioxidant and a naphthylamine antioxidant are preferable as the amine antioxidant.
  • the content of the antioxidant is preferably approximately in a range of 0.05 mass% to 7 mass%.
  • the lubricating oil composition containing the above components according to the invention satisfies the requirements of the components, the content and the viscosity described above, whereby the low-temperature viscosity can be significantly decreased while the high-temperature viscosity and the viscosity after shearing can be maintained on the conventional level. Accordingly, when used as a lubricating oil composition for a transmission, the lubricating oil composition according to the invention provides advantages of a high fuel-saving performance and maintainability of a fatigue life, and does not impair machine durability and reliability.
  • Lubricating oil compositions were prepared according to the blend composition set forth in Table 1.
  • the prepared compositions were measured in terms of a kinematic viscosity at 100 degrees C, a kinematic viscosity at -40 degrees C and a viscosity after shearing according to the following method.
  • the components described in Table 1 are as follows.
  • Mineral oil-1 Mineral oil containing a sulfur content of 0.03 mass% or less and having a kinematic viscosity at 100 degrees C of 1.0 mm 2 /s and a kinematic viscosity at 40 degrees C of 2.6 mm 2 /s
  • Mineral oil-2 Mineral oil containing a sulfur content of 0.03 mass% or less and having a kinematic viscosity at 100 degrees C of 6.5 mm 2 /s and a kinematic viscosity at 40 degrees C of 37 mm 2 /s
  • PAO-1 PAO having a kinematic viscosity at 100 degrees C of 300 mm 2 /s
  • PAO-2 PAO having a kinematic viscosity at 100 degrees C of 1.8 mm 2 /s
  • PAO-3 PAO having a kinematic viscosity at 100 degrees C of 100 mm 2 /s
  • Ester Butoxyethyl oleate ester having a kinematic viscosity at
  • Table 1 shows that the kinematic viscosity at -40 degrees C was significantly decreased while the kinematic viscosity at 100 degrees C and the kinematic viscosity after shearing were sufficiently maintained in Examples of the invention. It is understood from Examples 2 and 3 that blending silicone significantly decreases the kinematic viscosity at -40 degrees C.
  • the invention is usable as a lubricating oil composition, particularly suitably usable as a lubricating oil for a transmission.

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Lubricants (AREA)
  • General Details Of Gearings (AREA)
EP10845798.7A 2010-02-09 2010-11-17 Composition d'huile lubrifiante Withdrawn EP2535398A4 (fr)

Applications Claiming Priority (2)

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JP2010026545A JP5638256B2 (ja) 2010-02-09 2010-02-09 潤滑油組成物
PCT/JP2010/070427 WO2011099207A1 (fr) 2010-02-09 2010-11-17 Composition d'huile lubrifiante

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EP2535398A1 true EP2535398A1 (fr) 2012-12-19
EP2535398A4 EP2535398A4 (fr) 2013-08-14

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EP (1) EP2535398A4 (fr)
JP (1) JP5638256B2 (fr)
KR (1) KR20120125358A (fr)
CN (1) CN102741385B (fr)
WO (1) WO2011099207A1 (fr)

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EP2537914A1 (fr) * 2010-02-17 2012-12-26 Idemitsu Kosan Co., Ltd. Composition lubrifiante pour transmission à variation continue
WO2014028632A1 (fr) * 2012-08-14 2014-02-20 Dow Corning Corporation Compositions lubrifiantes
WO2015117804A1 (fr) 2014-02-04 2015-08-13 Evonik Oil Additives Gmbh Composition lubrifiante contenant des siloxanes organomodifiés
EP2873721A4 (fr) * 2012-07-13 2016-05-11 Idemitsu Kosan Co Composition d'huile lubrifiante et huile de transmission pour automobile l'utilisant

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JP6235864B2 (ja) * 2013-10-30 2017-11-22 出光興産株式会社 潤滑油組成物
JP6259728B2 (ja) * 2014-06-30 2018-01-10 出光興産株式会社 潤滑油組成物
KR101836946B1 (ko) * 2015-09-17 2018-04-19 이영서 온실가스, 질소산화물 및 입자상 물질 저감을 위한 연료첨가제
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EP2537914A1 (fr) * 2010-02-17 2012-12-26 Idemitsu Kosan Co., Ltd. Composition lubrifiante pour transmission à variation continue
EP2537914A4 (fr) * 2010-02-17 2013-12-11 Idemitsu Kosan Co Composition lubrifiante pour transmission à variation continue
US9725672B2 (en) 2010-02-17 2017-08-08 Idemitsu Kosan Co., Ltd Method for lubricating a continuously variable transmission, and a continuously variable transmission
EP2873721A4 (fr) * 2012-07-13 2016-05-11 Idemitsu Kosan Co Composition d'huile lubrifiante et huile de transmission pour automobile l'utilisant
WO2014028632A1 (fr) * 2012-08-14 2014-02-20 Dow Corning Corporation Compositions lubrifiantes
WO2015117804A1 (fr) 2014-02-04 2015-08-13 Evonik Oil Additives Gmbh Composition lubrifiante contenant des siloxanes organomodifiés

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JP2011162652A (ja) 2011-08-25
KR20120125358A (ko) 2012-11-14
WO2011099207A1 (fr) 2011-08-18
US20120309659A1 (en) 2012-12-06
CN102741385A (zh) 2012-10-17
CN102741385B (zh) 2016-04-13
EP2535398A4 (fr) 2013-08-14
JP5638256B2 (ja) 2014-12-10

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