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
  • 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
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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
  • C10M2203/1006—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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  • 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
• • 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
  • C10M2207/2805—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
  • C10M2207/283—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
  • 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
  • C10M2215/02—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
• • C—CHEMISTRY; METALLURGY
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  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
  • C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
  • C10M2215/064—Di- and triaryl amines
• • C—CHEMISTRY; METALLURGY
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  • 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
  • C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
  • C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
  • C10M2219/066—Thiocarbamic type compounds
  • C10M2219/068—Thiocarbamate metal 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
  • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
  • C10M2219/10—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring
  • C10M2219/104—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring containing sulfur and carbon with nitrogen or oxygen in the ring
  • C10M2219/106—Thiadiazoles
• • 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
  • C10M2223/049—Phosphite
• • 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
  • C10N2010/12—Groups 6 or 16
• • 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
  • C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/40—Low content or no content compositions
  • C10N2030/42—Phosphor free or low phosphor content compositions
• • 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
  • C10N2030/40—Low content or no content compositions
  • C10N2030/43—Sulfur free or low sulfur content compositions
• • 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 for gears.
• One way to save fuel in transmissions and final reduction gears is to reduce the viscosity of lubricating oil.
• automatic transmissions and continuously variable transmissions for automobiles have torque converters, wet clutches, gear bearing mechanisms, oil pumps, hydraulic control mechanisms, etc.
• manual transmissions and final reduction gears are gear bearings.
• the present invention has been made in view of such circumstances, has excellent low-temperature fluidity, has wear resistance, load resistance, and oxidation stability that can save fuel, and can further save power. It aims at providing the lubricating oil composition for gears which suppresses oil temperature rise.
• the present invention provides a lubricating oil composition shown in the following [1] to [3], use of the composition shown in the following [4], and production of the composition shown in the following [5]. Provide use for.
• a gear lubricating oil composition having a polymer content of 1 to 20% by mass, a kinematic viscosity at 40 ° C. of 60 mm 2 / s or less, and a viscosity index of 150 or more.
• the phosphorus content of the lubricating oil composition is 0.15% by mass or less in terms of phosphorus element, and the sulfur content of the lubricating oil composition is 1 in terms of elemental sulfur.
• the performance additive is a combination of a first additive containing phosphorus as a constituent element and not containing sulfur and a second additive containing sulfur as a constituent element and containing no phosphorus, and phosphorus and sulfur as constituent elements
• a third additive comprising both, a combination of the first additive and the third additive, a combination of the second additive and the third additive, and the first additive
• It further contains one performance additive selected from the group consisting of a combination of an additive, the second additive, and the third additive, and the content of the performance additive is represented by the following formula (1) , (2) and (3): C P ⁇ 0.15 (1) C S ⁇ 1.5 (2) (C S / C P ) ⁇ 11 (3) [Wherein C P represents the content of phosphorus contained in the performance additive, C S represents the content of sulfur contained in the performance additive, and C P and C S represent the total amount of the lubricating oil composition, respectively.
• An organic molybdenum compound, the content of the copolymer is 1 to 20% by mass based on the total amount of the lubricating oil composition, the kinematic viscosity at 40 ° C. is 60 mm 2 / s or less, and the viscosity index is Use, which is 150 or more.
• compositions for the production of gear lubricating oil comprising an ester base oil and a mineral oil base oil having a kinematic viscosity at 40 ° C. of 10 to 50 mm 2 / s.
• Copolymerization of a lubricant base oil having an ester base oil content of 1 to 15% by mass based on the total amount of the lubricant base oil and an ester monomer having an ⁇ -olefin and a polymerizable unsaturated bond A copolymer and an organomolybdenum compound, and the content of the copolymer is 1 to 20% by mass based on the total amount of the lubricating oil composition, and the kinematic viscosity at 40 ° C. is 60 mm 2 / s or less, Use wherein the viscosity index is 150 or more.
• the kinematic viscosity referred to in the present invention means the kinematic viscosity defined in ASTM D-445.
• the viscosity index as used in the present invention means a viscosity index measured in accordance with JIS K 2283-1993.
• a gear lubricating oil composition having excellent low-temperature fluidity, sufficient wear resistance, load resistance and oxidation stability, and further suppressing an increase in oil temperature. Therefore, particularly when applied to a gear for a railway, it is possible to improve fuel efficiency and power saving while improving startability at low temperatures and suppressing an increase in oil temperature in the gear box.
• the gear lubricating oil composition includes (A) an ester base oil and a mineral oil base oil having a kinematic viscosity at 40 ° C. of 10 to 50 mm 2 / s, based on the total amount of the lubricant base oil, (B) a copolymer of a lubricating base oil having an ester base oil content of 1 to 15% by mass, (B) an ⁇ -olefin and an ester monomer having a polymerizable unsaturated bond; An organic molybdenum compound, based on the total amount of the lubricating oil composition, the content of the copolymer is 1 to 20% by mass, the kinematic viscosity at 40 ° C. is 60 mm 2 / s or less, and the viscosity index is 150 or more.
• the lubricating oil composition according to the present embodiment includes an ester base oil and a mineral oil base oil having a kinematic viscosity at 40 ° C. of 10 to 50 mm 2 / s, and the content of the ester base oil is a lubricant base oil. Contains 1 to 15% by mass of a lubricating base oil based on the total amount.
• the alcohol constituting the ester base oil may be a monohydric alcohol or a polyhydric alcohol (polyol), and the acid constituting the ester base oil may be a monobasic acid or a polybasic acid. Moreover, if it is a base oil containing an ester bond, a complex ester compound may be used.
• the monohydric alcohol those having 1 to 24 carbon atoms, preferably 1 to 12 carbon atoms, more preferably 1 to 8 carbon atoms are usually used. Such alcohols may be linear or branched, It may be saturated or unsaturated. Specific examples of the alcohol having 1 to 24 carbon atoms include methanol, ethanol, linear or branched propanol, linear or branched butanol, and linear or branched pentanol.
• polyhydric alcohol those having 2 to 10 valences, preferably 2 to 6 valences are usually used.
• divalent to 10-valent polyhydric alcohol include, for example, ethylene glycol, diethylene glycol, polyethylene glycol (ethylene glycol tri- to 15-mer), propylene glycol, dipropylene glycol, polypropylene glycol (propylene glycol 3- 15-mer), 1,3-propanediol, 1,2-propanediol, 1,3-butanediol, 1,4-butanediol, 2-methyl-1,2-propanediol, 2-methyl-1, Dihydric alcohols such as 3-propanediol, 1,2-pentanediol, 1,3-pentanediol, 1,4-pentanediol, 1,5-pentanediol, neopentylglycol; glycerin, polyglycerin (glycerin (glycerin (g
• Polysaccharides such as xylose, arabinose, ribose, rhamnose, glucose, fructose, galactose, mannose, sorbose, cellobiose, maltose, isomaltose, trehalose, sucrose, and the like, and mixtures thereof. It is.
• a fatty acid having 2 to 24 carbon atoms is usually used as the monobasic acid.
• the fatty acid may be linear or branched, and may be saturated or unsaturated. Specifically, for example, acetic acid, propionic acid, linear or branched butanoic acid, linear or branched pentanoic acid, linear or branched hexanoic acid, linear or branched Branched heptanoic acid, linear or branched octanoic acid, linear or branched nonanoic acid, linear or branched decanoic acid, linear or branched undecanoic acid, Linear or branched dodecanoic acid, linear or branched tridecanoic acid, linear or branched tetradecanoic acid, linear or branched pentadecanoic acid, linear or branched Hexadecanoic acid, linear or branched heptadecanoic acid, linear or branched octade
• polybasic acid examples include dibasic acids having 2 to 16 carbon atoms and trimellitic acid.
• the dibasic acid having 2 to 16 carbon atoms may be linear or branched, and may be saturated or unsaturated.
• ethanedioic acid propanedioic acid, linear or branched butanedioic acid, linear or branched pentanedioic acid, linear or branched hexanedioic acid, Linear or branched heptanedioic acid, linear or branched octanedioic acid, linear or branched nonanedioic acid, linear or branched decanedioic acid, linear Linear or branched undecanedioic acid, linear or branched dodecanedioic acid, linear or branched tridecanedioic acid, linear or branched tetradecanedioic acid, linear or Branched
• the combination of the alcohol and the acid forming the ester is arbitrary and is not particularly limited.
• Examples of the ester that can be used in this embodiment include the following esters, and these esters may be used alone, Two or more kinds may be combined.
• (A) ester of monohydric alcohol and monobasic acid (b) ester of polyhydric alcohol and monobasic acid (c) ester of monohydric alcohol and polybasic acid (d) polyhydric alcohol and polybasic acid (E) Mixed ester of monohydric alcohol, mixture of polyhydric alcohol and polybasic acid (f) Mixed ester of polyhydric alcohol with monobasic acid, polybasic acid (g) Monohydric alcohol , Mixtures of polyhydric alcohols with monobasic acids and polybasic acids
• polyol polybasic alcohol
• a polyol ester is preferable, and (b) an ester of a polyhydric alcohol and a monobasic acid is more preferable.
• the content of the ester base oil is 1 to 15% by mass, preferably 3% by mass or more, more preferably 5% by mass or more, and further preferably 7% by mass, based on the total amount of the lubricating base oil. It is above, Especially preferably, it is 8 mass% or more. Moreover, it is 14 mass% or less preferably, More preferably, it is 13 mass% or less, More preferably, it is 12 mass% or less.
• the content of the ester base oil is 5% by mass or more, the wear resistance and load resistance tend to be excellent. Moreover, it exists in the tendency which is excellent in oxidation stability as content of ester base oil is 15 mass% or less.
• the kinematic viscosity at 40 ° C. of the ester base oil is not particularly limited, but is preferably 30 mm 2 / s or more, more preferably 35 mm 2 / s or more, and further preferably 40 mm 2 / s or more. Moreover, Preferably it is 60 mm ⁇ 2 > / s or less, More preferably, it is 55 mm ⁇ 2 > / s or less, More preferably, it is 50 mm ⁇ 2 > / s or less.
• the kinematic viscosity at 40 ° C. is 30 mm 2 / s or more or 60 mm 2 / s or less, extreme pressure properties, wear resistance, and seizure resistance tend to be excellent.
• the viscosity index of the ester base oil is not particularly limited, but is preferably 180 or more, more preferably 185 or more, and further preferably 190 or more. When the viscosity index is 180 or more, the low temperature fluidity tends to be excellent.
• the mineral oil base oil is not particularly limited as long as the kinematic viscosity at 40 ° C. is 10 to 50 mm 2 / s, but the lubricating oil fraction obtained by atmospheric distillation and vacuum distillation of crude oil can be desolvated.
• Mineral oil base oils such as paraffinic and naphthenic oils refined by solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid washing, clay treatment, etc. , Base oils produced by catalytic dewaxing of normal paraffin, isoparaffin, and petroleum wax. These base oils may be used alone or in combination of two or more at any ratio.
• Preferred mineral oil base oils include the following base oils.
• Distilled oil obtained by atmospheric distillation of paraffin-based crude oil and / or mixed-base crude oil (2) Vacuum-distilled distilled oil (WVGO) of atmospheric distillation residue of paraffin-based crude oil and / or mixed-base crude oil ) (3) Wax and / or Fischer-Tropsch wax produced by the GTL process, etc.
• WVGO Vacuum-distilled distilled oil
• the normal refining method is not particularly limited, and a refining method used in base oil production can be arbitrarily adopted.
• conventional purification methods include (a) hydrorefining such as hydrocracking and hydrofinishing, (b) solvent purification such as furfural solvent extraction, (c) dewaxing such as solvent dewaxing and catalytic dewaxing. And (d) white clay purification using acid clay, activated clay, etc., (e) chemical (acid or alkali) purification such as sulfuric acid washing and caustic soda washing, and the like. In the present embodiment, one or more of these can be employed in any combination and in any order.
• Mineral oil base oils are base oils classified as Group II or Group III defined in API (American Petroleum Institute) Base Stock Categories from the viewpoint of lowering viscosity and sulfur content. Are preferred, and base oils classified in Group III are more preferred.
• the kinematic viscosity at 40 ° C. of the mineral oil base oil is 10 to 50 mm 2 / s, preferably 15 mm 2 / s or more, more preferably 18 mm 2 / s or more. Moreover, Preferably it is 40 mm ⁇ 2 > / s or less, More preferably, it is 35 mm ⁇ 2 > / s or less.
• kinematic viscosity at 40 ° C. to 50 mm 2 / s or less, it is possible to obtain a lubricating oil composition having excellent low-temperature fluidity and low fluid resistance, and thus having a smaller rotational resistance.
• the viscosity index of the mineral base oil is not particularly limited, but is preferably 100 or more, more preferably 110 or more, and further preferably 120 or more. By setting the viscosity index to 100 or more, it is possible to obtain a lubricating oil composition that exhibits good viscosity characteristics from low temperature to high temperature and is excellent in oxidation stability.
• the sulfur content of the mineral oil base oil is not particularly limited, but may be 100 ppm by mass, 50 ppm by mass or 10 ppm by mass based on the total amount of the lubricant base oil.
• the sulfur content of the mineral base oil can be determined by, for example, ICP elemental analysis.
• the lubricating base oil according to this embodiment may include a synthetic base oil as a base oil other than an ester base oil and a mineral oil base oil having a kinematic viscosity at 40 ° C. of 10 to 50 mm 2 / s.
• synthetic base oils include poly ⁇ -olefins or hydrides thereof, isobutene oligomers or hydrides thereof, isoparaffins, base oils produced by catalytic dewaxing of waxes produced from a Fischer-Tropsch process, and the like.
• the kinematic viscosity at 40 ° C. of the lubricating base oil is not particularly limited, but is preferably 15 mm 2 / s or more, more preferably 20 mm 2 / s or more. Moreover, Preferably it is 40 mm ⁇ 2 > / s or less, More preferably, it is 35 mm ⁇ 2 > / s or less.
• By setting the kinematic viscosity at 40 ° C. to 15 mm 2 / s or more it becomes possible to obtain a lubricating oil composition in which oil film formation is sufficient, lubricity is excellent, and evaporation loss of the base oil is small under high temperature conditions. . Further, by setting the 40 ° C. kinematic viscosity to 40 mm 2 / s or less, it is possible to obtain a lubricating oil composition having excellent low-temperature fluidity and low fluid resistance, and thus having a smaller rotational resistance.
• the kinematic viscosity at 100 ° C. of the lubricating base oil is not particularly limited, but is preferably 1 mm 2 / s or more, more preferably 3 mm 2 / s or more. Moreover, Preferably it is 10 mm ⁇ 2 > / s or less, More preferably, it is 8 mm ⁇ 2 > / s or less.
• the viscosity index of the lubricating base oil is not particularly limited, but is preferably 120 or more, more preferably 125 or more, and further preferably 130 or more. By setting the viscosity index to 120 or more, it is possible to obtain a lubricating oil composition that exhibits good viscosity characteristics from low temperature to high temperature and has excellent oxidation stability.
• the lubricating oil composition according to this embodiment contains a copolymer of an ⁇ -olefin and an ester monomer having a polymerizable unsaturated bond as a viscosity modifier. By combining such a copolymer with the component (A), the low temperature fluidity can be enhanced.
• the ester monomer having a polymerizable unsaturated bond is not particularly limited as long as it is a compound having a polymerizable unsaturated bond and an ester bond, but at least one of the ⁇ carbon and ⁇ carbon of the carboxy group is ethylenically unsaturated.
• An ⁇ , ⁇ -ethylenically unsaturated dicarboxylic acid diester which is a diester of an unsaturated dicarboxylic acid forming a bond (that is, a C ⁇ C double bond) is preferable.
• the ⁇ , ⁇ -ethylenically unsaturated dicarboxylic acid forms an ethylenically unsaturated bond with respect to both carboxy groups such as maleic acid, fumaric acid, citraconic acid, and mesaconic acid.
• ⁇ , ⁇ -ethylenically unsaturated bonds are not limited to compounds present in the main chain, and only one carboxy group such as glutaconic acid has ⁇ and ⁇ carbons that are ethylenic. It is a concept that includes a compound having an unsaturated bond, and also includes a compound in which an ⁇ , ⁇ -ethylenically unsaturated bond is found in the side chain, such as itaconic acid.
• the structure of the copolymer of the ⁇ -olefin and the ester monomer having a polymerizable unsaturated bond is not particularly limited. Further, the production method is not particularly limited, and those produced by a known method can be used.
• the weight average molecular weight of the copolymer of the ⁇ -olefin and the ester monomer having a polymerizable unsaturated bond is not particularly limited, but is preferably 2000 or more, more preferably 4000 or more, and further preferably 6000. That's it. Moreover, Preferably it is 20000 or less, More preferably, it is 15000 or less, More preferably, it is 12000 or less. By setting the weight average molecular weight to 2000 or more or 20000 or less, the low temperature fluidity can be improved.
• the weight average molecular weight means that two columns of GHSHR-M (7.8 mm ID ⁇ 30 cm) manufactured by Tosoh Corporation are used in series in a 150-C ALC / GPC apparatus manufactured by Waters, and tetrahydrofuran is used as a solvent. It means the weight average molecular weight in terms of standard polystyrene measured using a differential refractometer (RI) detector under the conditions of a temperature of 23 ° C., a flow rate of 1 mL / min, a sample concentration of 1 mass%, and a sample injection amount of 75 ⁇ L.
• RI differential refractometer
• the content of the component (B) is 1 to 20% by mass, preferably 2% by mass or more, more preferably 4% by mass based on the total amount of the lubricating oil composition. % Or more, more preferably 6% by mass or more, and particularly preferably 7% by mass or more. Moreover, Preferably it is 19.5 mass% or less, More preferably, it is 19 mass% or less.
• the content of the component (B) By setting the content of the component (B) to 5% by mass or more, it tends to be more excellent in wear resistance and load resistance. Moreover, it exists in the tendency which shows more sufficient abrasion resistance, load resistance, and oxidation stability by content of (B) component being 20 mass% or less.
• the lubricating oil composition according to the present embodiment contains (C) an organic molybdenum compound as a friction modifier. Thereby, the stirring resistance of a gear can be resisted and an oil temperature rise can be suppressed.
• organic molybdenum compound according to the present embodiment examples include sulfur-containing organic molybdenum compounds such as molybdenum dithiophosphate and molybdenum dithiocarbamate (MoDTC), molybdenum compounds (for example, molybdenum oxide such as molybdenum dioxide and molybdenum trioxide, and orthomolybdic acid.
• sulfur-containing organic molybdenum compounds such as molybdenum dithiophosphate and molybdenum dithiocarbamate (MoDTC)
• molybdenum compounds for example, molybdenum oxide such as molybdenum dioxide and molybdenum trioxide
• orthomolybdic acid examples include sulfur-containing organic molybdenum compounds such as molybdenum dithiophosphate and molybdenum dithiocarbamate (MoDTC), molybdenum compounds (for example, molybdenum oxide such as molybdenum dioxide and molybdenum trioxid
• Molybdate such as paramolybdic acid, (poly) sulfurized molybdate, metal salts of these molybdates, molybdate such as ammonium salt, molybdenum disulfide, molybdenum trisulfide, molybdenum pentasulfide, molybdenum sulfide such as polysulfide molybdenum , Sulfurized molybdic acid, metal salts or amine salts of sulfurized molybdic acid, molybdenum halides such as molybdenum chloride, etc.) and sulfur-containing organic compounds (eg, alkyl (thio) xanthate, thiadiazole, mercaptothiadi) Sol, thiocarbonate, tetrahydrocarbyl thiuram disulfide, bis (di (thio) hydrocarbyl dithiophosphonate) disulfide, organic (poly) sulfide, s
• organic molybdenum compound an organic molybdenum compound that does not contain sulfur as a constituent element can be used.
• organic molybdenum compounds that do not contain sulfur as a constituent element include molybdenum-amine complexes, molybdenum-succinimide complexes, molybdenum salts of organic acids, and molybdenum salts of alcohols. Complexes, molybdenum salts of organic acids and molybdenum salts of alcohols are preferred.
• the content of the organomolybdenum compound is not particularly limited, but is preferably 400 mass ppm or more, more preferably 500 masses in terms of molybdenum element, based on the total amount of the lubricating oil composition. ppm or more. Moreover, Preferably it is 800 mass or less in conversion of molybdenum element, More preferably, it is 700 mass ppm or less. By setting the content to 400 mass ppm or more or 800 mass ppm or less, the wear resistance and load resistance tend to be more excellent. In addition, the molybdenum element conversion amount of the organic molybdenum compound can be obtained by, for example, ICP elemental analysis.
• the phosphorus content of the lubricating oil composition according to this embodiment is preferably 0.15% by mass or less, more preferably 0.14% by mass or less, in terms of phosphorus element, based on the total amount of the lubricating oil composition. More preferably, it is 0.13 mass% or less.
• the phosphorus content in the lubricating oil composition can be determined, for example, by ICP elemental analysis.
• blended with lubricating base oil can be previously analyzed by ICP elemental analysis etc., and the phosphorus content in a lubricating oil composition can also be calculated
• the sulfur content of the lubricating oil composition according to the present embodiment is preferably 1.5% by mass or less, more preferably 1.3% by mass or less in terms of elemental sulfur, based on the total amount of the lubricating oil composition. More preferably, it is 1.2 mass% or less.
• the sulfur content in the lubricating oil composition can be determined by, for example, ICP elemental analysis.
• blended with lubricating base oil can be previously analyzed by ICP elemental analysis etc., and the sulfur content in a lubricating oil composition can also be calculated
• the ratio (S / P) of the sulfur content to the phosphorus content of the lubricating oil composition according to this embodiment is preferably 11.0 or less, and more preferably 10.0 or less.
• the lubricating oil composition according to the present embodiment includes a combination of a first additive that contains phosphorus as a constituent element and does not contain sulfur, and a second additive that contains sulfur as a constituent element and does not contain phosphorus, and phosphorus as a constituent element. And a third additive comprising both sulfur and sulfur, a combination of the first additive and the third additive, a combination of the second additive and the third additive, and the first One performance additive selected from the group consisting of a combination of one additive, the second additive, and the third additive may be further contained.
• the first additive is an additive that contains phosphorus as a constituent element and does not contain sulfur. Although it does not restrict
• the second additive is an additive that contains sulfur as a constituent element and does not contain phosphorus.
• (C) the organomolybdenum compound is not included in the second additive.
• Second additives include dithiocarbamates, zinc dithiocarbamates, disulfides, polysulfides, sulfurized olefins, sulfurized fats and other antiwear agents (or extreme pressure agents), sulfonate detergents (alkali metals or alkalis).
• Metal-based detergents such as normal salts with earth metals, basic normal salts, overbased salts), corrosion inhibitors such as thiadiazoles, alkylthiadiazoles, mercaptobenzothiazoles, 1,3,4-thiadiazole polysulfides, 1, Metal deactivators such as 3,4-thiadiazolyl-2,5-bisdialkyldithiocarbamate, 2- (alkyldithio) benzimidazole, ⁇ - (o-carboxybenzylthio) propiononitrile, petroleum sulfonate, alkylbenzene sulfonate, di Rust preventives such as nonylnaphthalene sulfonate And the like.
• corrosion inhibitors such as thiadiazoles, alkylthiadiazoles, mercaptobenzothiazoles, 1,3,4-thiadiazole polysulfides, 1, Metal deactivators such as 3,4-thiadiazolyl-2,5-bisdial
• the third additive is an additive containing both phosphorus and sulfur as constituent elements.
• the third additive is not particularly limited, but is zinc dialkyldithiophosphate (ZnDTP), thiophosphites, dithiophosphites, trithiophosphites, thiophosphates, dithiophosphates And sulfur-phosphorus extreme pressure agents such as trithiophosphates, amine salts thereof, metal salts thereof and derivatives thereof.
• the content of the performance additive preferably satisfies the conditions represented by the following formulas (1), (2), and (3).
• C P ⁇ 0.15 (1)
• C S ⁇ 1.5 (2) (C S / C P ) ⁇ 11 (3)
• C P represents the content of phosphorus contained in the performance additive
• C S represents the content of sulfur contained in the performance additive
• C P and C S represent the total amount of the lubricating oil composition, respectively. It is the element conversion value (mass%) of phosphorus or sulfur on the basis of. ]
• CP is preferably 0.15 or less, more preferably 0.14 or less, and still more preferably 0.13 or less. Moreover, Preferably it is 0.08 or more, More preferably, it is 0.09 or more, More preferably, it is 0.10 or more. By the C P and 0.15 or less, oxidation stability is further ensured. Further, by making the C P 0.08 or more, the wear resistance and load resistance becomes more fully tend to be more suppressed oil temperature increases.
• CS is preferably 1.5 or less, more preferably 1.3 or less, and even more preferably 1.2 or less. Moreover, Preferably it is 0.8 or more, More preferably, it is 0.9 or more, More preferably, it is 1.0 or more. By 1.5 or less C S, oxidation stability is further ensured. Further, by 0.8 or more C S, wear resistance and load resistance becomes more fully tend to be more suppressed oil temperature increases.
• (C S / C P ) is preferably 11.0 or less, and more preferably 10.0 or less. By setting (C S / C P ) to 11.0 or less, the wear resistance, load resistance and oxidation stability become more sufficient, and the oil temperature rise tends to be further suppressed.
• the lubricating oil composition according to the present embodiment may contain any additive generally used for lubricating oil depending on the purpose.
• additives include viscosity modifiers other than the component (B), metallic detergents, ashless dispersants, antioxidants, corrosion inhibitors, rust inhibitors, demulsifiers, metal deactivators, Examples thereof include additives such as antifoaming agents, friction modifiers other than the component (C), and the like.
• the viscosity modifier other than the component (B) is specifically a non-dispersed or dispersed ester group-containing viscosity modifier, such as a non-dispersed or dispersed poly (meth) acrylate viscosity modifier, non-dispersed.
• a non-dispersed or dispersed poly (meth) acrylate viscosity modifier such as a non-dispersed or dispersed poly (meth) acrylate viscosity modifier, non-dispersed.
• Type or dispersion type olefin- (meth) acrylate copolymer-based viscosity modifier such as a non-dispersed or dispersed poly (meth) acrylate viscosity modifier, non-dispersed.
• styrene-maleic anhydride copolymer-based viscosity modifier such as a non-dispersed or dispersed poly (meta) )
• An acrylate viscosity modifier is preferred.
• non-dispersed or dispersed ethylene- ⁇ -olefin copolymer or a hydride thereof, polyisobutylene or a hydride thereof, a styrene-diene hydrogenated copolymer examples thereof include polyalkylstyrene.
• metal detergents examples include salicylate detergents, phenate detergents, and the like, and any of normal salts, basic normal salts, and overbased salts with alkali metals or alkaline earth metals can be blended. . In use, one kind or two or more kinds arbitrarily selected from these can be blended.
• the ashless dispersant any ashless dispersant used in lubricating oils can be used.
• the ashless dispersant is a mono- or mono-chain having at least one linear or branched alkyl group or alkenyl group having 40 to 400 carbon atoms in the molecule.
• the modified products include compounds, carboxylic acids, phosphoric acids, and the like. In use, one kind or two or more kinds arbitrarily selected from these can be blended.
• antioxidants examples include ashless antioxidants such as phenols and amines, and metal antioxidants such as copper and molybdenum.
• phenol-based ashless antioxidants include 4,4′-methylenebis (2,6-di-tert-butylphenol), 4,4′-bis (2,6-di-tert-
• amine-based ashless antioxidants include phenyl- ⁇ -naphthylamine, alkylphenyl- ⁇ -naphthylamine, and dialkyldiphenylamine.
• corrosion inhibitor examples include benzotriazole, tolyltriazole, and imidazole compounds.
• Examples of the rust preventive include alkenyl succinic acid ester and polyhydric alcohol ester.
• demulsifier examples include polyalkylene glycol nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, and polyoxyethylene alkyl naphthyl ether.
• metal deactivator examples include imidazoline, pyrimidine derivatives, benzotriazole or derivatives thereof.
• antifoaming agent examples include silicone oil having a kinematic viscosity at 25 ° C. of 1,000 to 100,000 mm 2 / s, alkenyl succinic acid derivative, ester of polyhydroxy aliphatic alcohol and long chain fatty acid, methyl salicylate and o- Examples thereof include esters with hydroxybenzyl alcohol.
• Examples of the friction modifier other than the component (C) include ashless friction modifiers, and any compound that is usually used as an ashless friction modifier for lubricating oils can be used. Having at least one hydrocarbon group, preferably an alkyl group or an alkenyl group, particularly a straight-chain alkyl group or straight-chain alkenyl group having 6 to 30 carbon atoms in the molecule, amine-based, imide-based, fatty acid ester-based, fatty acid amide Ashless friction modifiers such as those based on fatty acids, fatty alcohols, aliphatic alcohols, and aliphatic ethers.
• the kinematic viscosity at 40 ° C. of the lubricating oil composition according to this embodiment is 60 mm 2 / s or less, preferably 55 mm 2 / s or less, more preferably 52 mm 2 / s or less.
• the lower limit value of the kinematic viscosity at 40 ° C. of the lubricating oil composition is not particularly limited, but is preferably 30 mm 2 / s or more, more preferably 40 mm 2 / s or more, and further preferably 45 mm 2 / s. That's it.
• By setting the kinematic viscosity at 40 ° C. to 30 mm 2 / s or more it tends to be more excellent in oil film retention and evaporability at the lubrication site.
• the viscosity index of the lubricating oil composition according to this embodiment is 120 or more, preferably 130 or more, more preferably 140 or more, and still more preferably 150 or more.
• the viscosity index is 120 or more, sufficient fuel economy tends to be obtained.
• the upper limit of the viscosity index is not particularly limited, but can be, for example, 250 or less. By setting the viscosity index to 250 or less, more sufficient evaporability is obtained, and there is a tendency that problems due to insufficient solubility of the additive can be further suppressed.
• the BF viscosity at ⁇ 30 ° C. of the lubricating oil composition according to this embodiment is not particularly limited, but is preferably 15000 mPa ⁇ s or less, more preferably 14000 mPa ⁇ s or less, and even more preferably 13000 mPa ⁇ s or less. is there.
• the BF viscosity is not particularly limited, but is preferably 15000 mPa ⁇ s or less, more preferably 14000 mPa ⁇ s or less, and even more preferably 13000 mPa ⁇ s or less. is there.
• the lubricating oil composition according to the present embodiment has excellent low-temperature fluidity, has wear resistance, load resistance, and oxidation stability that can save fuel, and further suppresses an increase in oil temperature that can save power. Therefore, it can be suitably used for a railway gear or a final reduction gear.
• Example 1 to 7 and Comparative Examples 1 to 5 As shown in Table 1, lubricating oil compositions of Examples 1 to 7 and Comparative Examples 1 to 5 were prepared. The obtained lubricating oil composition was measured for low-temperature fluidity, wear resistance, load resistance and oxidation stability, and the results are also shown in Table 1.
• Base oil A-1 Hydrorefined mineral oil [Group III, kinematic viscosity at 40 ° C .: 19.57 mm 2 / s, kinematic viscosity at 100 ° C .: 4.23 mm 2 / s, viscosity index: 122, sulfur content (amount converted to elemental sulfur) ): Less than 10 mass ppm, phosphorus content (phosphorus element equivalent): less than 10 mass ppm,% C P : 80.7,% C N : 19.3,% C A : 0]
• Base oil A-2 hydrorefined mineral oil [Group III, kinematic viscosity at 40 ° C .: 33.97 mm 2 / s, kinematic viscosity at 100 ° C .: 6.208 mm 2 / s, viscosity index: 133, sulfur content (amount converted to elemental sulfur) ): Less than 10 mass ppm, phosphoric oil (amount converted to elemental sulfur)
• Viscosity modifier B-1 Copolymer of ⁇ -olefin and ⁇ , ⁇ -ethylenically unsaturated dicarboxylic acid diester [weight average molecular weight: 10,000]
• Viscosity modifier B-2 Polymethacrylate viscosity modifier [number average molecular weight: 20000]
• Organic molybdenum compound C-1 Molybdenum dithiocarbamate (MoDTC) [Molybdenum element equivalent: 10% by mass, sulfur element equivalent: 10.8% by mass]
• Performance additive D-1 Additive package (boron-containing succinimide, phosphate ester, polysulfide, thiadiazole, amine-based friction modifier, amine-based antioxidant,
• the elemental sulfur conversion amount and the elemental phosphorus conversion amount in the base oil, the elemental molybdenum conversion amount and the elemental sulfur conversion amount in the organomolybdenum compound, and the elemental sulfur conversion amount and elemental phosphorus conversion amount in the performance additive were determined by ICP elemental analysis. .
• the gear lubricating oil compositions of Examples 1 to 7 of the present application have low-temperature fluidity (for example, a BF viscosity at ⁇ 30 ° C. of 15000 mPa ⁇ s or less) and wear resistance (for example, a wear scar diameter of 0.1). 70 mm or less), load resistance (for example, oil temperature increase is 100 ° C. or less) and oxidation stability (for example, acid value increase is 2.0 mgKOH / g or less) are excellent in a well-balanced manner.
• low-temperature fluidity for example, a BF viscosity at ⁇ 30 ° C. of 15000 mPa ⁇ s or less
• wear resistance for example, a wear scar diameter of 0.1
• load resistance for example, oil temperature increase is 100 ° C. or less
• oxidation stability for example, acid value increase is 2.0 mgKOH / g or less

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