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
  • C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
  • C10M101/02—Petroleum fractions
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  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
  • C10M141/10—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic phosphorus-containing compound
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  • 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
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  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
  • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
  • C10M129/68—Esters
  • C10M129/72—Esters of polycarboxylic acids
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  • C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
  • C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
  • C10M133/04—Amines, e.g. polyalkylene polyamines; Quaternary amines
  • C10M133/12—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to a carbon atom of a six-membered aromatic ring
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  • 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
  • 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
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  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/10—Carboxylix acids; Neutral salts thereof
  • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
  • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
  • C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
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  • 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
• • 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
  • C10M2207/34—Esters having a hydrocarbon substituent of thirty or more carbon atoms, e.g. substituted succinic acid derivatives
• • 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
  • C10M2215/02—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
  • C10M2215/065—Phenyl-Naphthyl amines
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/22—Heterocyclic nitrogen compounds
  • C10M2215/223—Five-membered rings containing nitrogen and carbon only
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • 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
  • C10M2219/082—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
  • C10M2219/085—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms containing carboxyl groups; Derivatives thereof
• • C—CHEMISTRY; METALLURGY
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  • 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
  • C10M2223/041—Triaryl phosphates
• • 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
  • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
  • C10M2223/06—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having phosphorus-to-carbon bonds
• • 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
  • C10N2010/06—Groups 3 or 13
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/01—Physico-chemical properties
  • C10N2020/02—Viscosity; Viscosity index
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/02—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
  • C10N2030/04—Detergent property or dispersant property
• • 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
  • C10N2040/02—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
  • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
  • F16C33/02—Parts of sliding-contact bearings
  • F16C33/04—Brasses; Bushes; Linings
  • F16C33/06—Sliding surface mainly made of metal
  • F16C33/10—Construction relative to lubrication
  • F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
  • F16C33/109—Lubricant compositions or properties, e.g. viscosity

Definitions

• the present invention relates to lubricating oil compositions and, in particular, to a lubricating oil composition for an oil-impregnated bearing in a motor of audio/video equipment or the like.
• Oil-impregnated bearings are produced by impregnating porous materials such as sintered metal, grown cast iron and synthetic resin with a lubricating oil.
• porous materials such as sintered metal, grown cast iron and synthetic resin
• an oil-impregnated sintered bearing which is producible at low costs and self-lubricating and has relatively low friction and high accuracy, is widely used as a motor bearing in relevant parts of vehicle electric components, audio/video equipment, office supplies, home electric appliances, computer auxiliary storage drives and the like.
• a lubricating oil for a spindle motor used in audio/video equipment or the like should be capable of reducing friction resistance (bearing loss) between a rotary shaft and a bearing and suppressing temperature rise during continuous rotation.
• a lubricating oil for oil-impregnated bearings is disclosed, the lubricating oil being prepared by blending a base oil with: a fatty acid metal salt; and at least one of a phosphate or an amine salt thereof and a sulfuric extreme pressure agent (see Patent Literature 1).
• Patent Literature 1 Japanese Patent No. 4777526
• An object of the invention is to provide a lubricating oil composition suitable for oil-impregnated bearings, the lubricating oil composition being excellent in wear resistance and unlikely to generate sludge even at a high temperature.
• an aspect of the invention provides the following lubricating oil composition.
• a lubricating oil composition contains a base oil, (A) a phosphate, (B) a thiophosphate and (C) a naphthylamine derivative.
• the lubricating oil composition of (1) further contains (D) an alkenylsuccinic acid polyhydric alcohol ester.
• the lubricating oil composition of (1) or (2) further contains (E) a benzotriazole or a derivative thereof.
• the base oil is a hydrocarbon base oil.
• the lubricating oil composition of any one of (1) to (4) is used for an oil-impregnated bearing.
• the oil-impregnated bearing is used for a rotation drive motor for a synthetic resin disc.
• the above aspect of the invention can provide a lubricating oil composition excellent in wear resistance and unlikely to generate sludge even at a high temperature.
• the lubricating oil composition is thus suitable for oil-impregnated bearings.
• a lubricating oil composition according to an exemplary embodiment of the invention (hereinafter also referred to as “the present composition”) is provided by blending a base oil with (A) a phosphate, (B) a thiophosphate and (C) a naphthylamine or a derivative thereof. It should be noted that the expression “being provided by blending” means “being blended with”, and thus means “containing”. The present composition will be described below in detail.
• the base oil in the present composition is not subject to any particular limitation. However, when the present composition is provided to an oil-impregnated bearing in a rotation drive motor for a synthetic resin disc, the base oil is preferably a hydrocarbon base oil.
• the synthetic resin disc herein includes optical discs such as DVD (e.g., DVD-R, DVD-RAM and DVD-RW) and Blu-ray Disc.
• Polar base oils such as an ester base oil and an ether base oil are likely to cause alteration of a surface of the synthetic resin disc, which results in problems such as an error in reading the disc.
• the kinematic viscosity of the base oil at 40 degrees C. is preferably in the range from 15 mm 2 /s to 40 mm 2 /s and more preferably in the range from 20 mm 2 /s to 30 mm 2 /s.
• the hydrocarbon base oil is preferably polyolefin, examples of which are alpha-olefin homopolymer and alpha-olefin copolymer. Any one of the above base oils may be used alone, or two or more thereof may be used in combination.
• the component (A) in the present composition is a phosphate.
• a phosphate functioning as an extreme pressure agent is favorable in terms of wear resistance.
• the phosphate examples include a triaryl phosphate, trialkyl phosphate, trialkylaryl phosphate, triarylalkyl phosphate and trialkenyl phosphate.
• Specific examples of the phosphate include a triphenyl phosphate, tricresyl phosphate, benzyl diphenyl phosphate, ethyl diphenyl phosphate, tributyl phosphate, ethyl dibutyl phosphate, cresyl diphenyl phosphate, dicresyl phenyl phosphate, ethylphenyl diphenyl phosphate, diethylphenyl phenyl phosphate, propylphenyl diphenyl phosphate, dipropylphenyl phenyl phosphate, triethylphenyl phosphate, tripropylphenyl phosphate, butylphenyl diphenyl phosphate, dibutylpheny
• any one of the above phosphates may be used alone as the component (A) in the present composition, or two or more thereof may be used in combination.
• the content of the component (A) is preferably in the range from 0.1 mass % to 5 mass % of the total amount of the present composition, more preferably in the range from 1 mass % to 4 mass %, and further preferably in the range from 1.5 mass % to 2.5 mass %.
• the wear resistance may be insufficient.
• the component (A) will not be effective in improving the wear resistance in proportion to the content.
• the content of the component (A) is preferably in the range from 150 mass ppm to 3000 mass ppm of the total amount of the present composition in terms of phosphorus, and more preferably in the range from 300 mass ppm to 2000 mass ppm.
• the component (B) in the present composition is a thiophosphate.
• the thiophosphate should be effective for the present composition in maintaining oxidation stability and improving wear resistance.
• thiophosphate examples include tributyl phosphorothionate, tripentyl phosphorothionate, trihexyl phosphorothionate, triheptyl phosphorothionate, trioctyl phosphorothionate, trinonyl phosphorothionate, tridecyl phosphorothionate, triundecyl phosphorothionate, tridodecyl phosphorothionate, tritridecyl phosphorothionate, tritetradecyl phosphorothionate, tripentadecyl phosphorothionate, trihexadecyl phosphorothionate, triheptadecyl phosphorothionate, trioctadecyl phosphorothionate, trioleyl phosphorothionate, triphenyl phosphorothionate, tricresyl phosphorothionate, trixylenyl phosphorothionate, cres
• any one of the above thiophosphates may be used alone as the component (B) in the present composition, or two or more thereof may be used in combination.
• the content of the component (B) is preferably in the range from 0.1 mass % to 5 mass % of the total amount of the present composition, more preferably in the range from 0.2 mass % to 2 mass %, and further preferably in the range from 0.3 mass % to 0.6 mass %.
• the content of the component (B) is less than 0.1 mass %, the component (B) may be insufficiently effective in improving the oxidation stability and wear resistance. However, even when the content of the component (B) exceeds 5 mass %, the effects of the component (B) will not be improved in proportion to the content.
• the component (C) in the present composition is a naphthylamine derivative.
• the naphthylamine derivative should be effective for the present composition in maintaining oxidation stability and suppressing vaporizability.
• the naphthylamine derivative is particularly preferably a phenyl-alpha-naphthylamine represented by the following formula (1) and a derivative thereof (hereiafter these substances are also referred to simply as “naphthylamines”).
• R represents a hydrogen atom or an alkyl group.
• the alkyl group possibly represented by R in the above formula (1) is linear or branched and has 1 to 16 carbon atoms. Specific examples of the alkyl group include methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl and hexadecyl. It should be noted that when R has carbon atoms more than 16, the percentage of a functional group in a molecule is reduced and thus an antioxidative effect may be lowered.
• the alkyl group possibly represented by R in the formula (1) is preferably a branched alkyl group having 8 to 16 carbon atoms in terms of solubility, and further preferably a branched alkyl group having 8 to 16 carbon atoms derived from an oligomer of an olefin having 3 or 4 carbon atoms.
• the olefin having 3 or 4 carbon atoms include propylene, 1-butene, 2-butene and isobutylene, among which propylene and isobutylene are preferable in terms of solubility.
• R further preferably represents any one of a branched octyl group derived from an isobutylene dimer, a branched nonyl group derived from a propylene trimer, a branched dodecyl group derived from an isobutylene trimer, a branched dodecyl group derived from a propylene tetramer, and a branched pentadecyl group derived from a propylene pentamer, among which a branched octyl group derived from an isobutylene dimer, a branched dodecyl group derived from an isobutylene trimer and a branched dodecyl group derived from a propylene tetramer are especially preferable.
• the alkyl group possibly represented by R may be linked to a phenyl group at any position, but preferably at a p-position relative to an amino group. Further, the amino group may be linked to a naphthyl group at any position, but is preferably linked at an alpha-position.
• Any one of the above naphthylamines represented by the formula (1) may be used alone, or a mixture of structurally different two or more thereof may be used.
• any one of the above naphthylamine derivatives may be used alone as the component (C) in the present composition, or two or more thereof may be used in combination.
• the content of the component (C) is preferably in the range from 0.1 mass % to 5 mass % of the total amount of the present composition, more preferably in the range from 0.2 mass % to 2 mass %, and further preferably in the range from 0.3 mass % to 1 mass %.
• the content of the component (C) is less than 0.1 mass %, the component (C) may be insufficiently effective in improving the oxidation stability and evaporation characteristics.
• the effects of the component (C) will not be improved in proportion to the content.
• the present composition may be further blended with an alkenylsuccinic acid polyhydric alcohol ester as a component (D) to improve the evaporation characteristics.
• the component (D) is an ester prepared from, for instance, an alkenylsuccinic acid with an alkenyl group having 12 to 20 carbon atoms and a polyhydric alcohol.
• the alkenyl group examples of which include dodecenyl, hexadecenyl, octadecenyl and isooctadecenyl, has carbon atoms less than 12, the friction coefficient is likely to be slightly increased. When the alkenyl group has carbon atoms more than 20, rust resistance is unlikely to be exhibited.
• polyhydric alcohol examples include: saturated dihydric alcohols such as ethylene glycol, propylene glycol, butylene glycol, hexylene glycol and isomers of these glycols; and trihydric or higher saturated polyhydric alcohols such as trimethylol propane, trimethylol butane, glycerin, pentaerythritol and dipentaerythritol.
• saturated dihydric alcohols having 3 or 4 carbon atoms such as propylene glycol, butylene glycol, trimethylol propane, glycerin and pentaerythritol are preferable in terms of lubricity.
• any one of the above substances may be used alone as the component (D), or two or more thereof may be used in combination.
• the content of the component (D) is preferably in the range from 0.01 mass % to 2 mass % of the total amount of the present composition, more preferably in the range from 0.02 mass % to 1 mass %, and further preferably in the range from 0.03 mass % to 0.5 mass %.
• the content of the component (D) is less than 0.01 mass %, the component (D) may be insufficiently effective in improving the evaporation characteristics.
• the effects of the component (D) will not be improved in proportion to the content.
• the present composition may be further blended with a benzotriazole or a derivative thereof as a component (E) to improve the evaporation characteristics.
• a benzotriazole or a derivative thereof as a component (E) to improve the evaporation characteristics.
• the component (E) include a 1,2,3-benzotriazole, 1-methyl-1,2,3-benzotriazole, 1 -phenyl-1,2,3 -benzotriazole, 2-phenyl-1,2,3 -benzotriazole, 4-chloro-1,2,3 -benzotriazole, 4-nitro-1,2,3-benzotriazole, 5-methyl-1,2,3 -benzotriazole, 5-ethyl-1,2,3 -benzotriazole, 5-propyl-1,2,3-benzotriazole, 5-isobutyl-1,2,3-benzotriazole, 5-methoxy-1,2,3-benzotriazole, 5-chloro-1,2,3-benzotriazole
• the content of the component (E) is preferably in the range from 0.001 mass % to 5 mass % of the total amount of the present composition, more preferably in the range from 0.005 mass % to 3 mass %, and further preferably in the range from 0.01 mass % to 2 mass %.
• the content of the component (E) is less than 0.001 mass %, the component (E) may be insufficiently effective in improving the evaporation characteristics. Even when the content of the component (E) is increased more than 5 mass %, the effects of the component (E) will not be improved in proportion to the content.
• the present composition may be further blended with known additives such as an anti-emulsifier, a rust inhibitor, a detergent dispersant and an antifoaming agent, if necessary.
• known additives such as an anti-emulsifier, a rust inhibitor, a detergent dispersant and an antifoaming agent, if necessary.
• anti-emulsifier examples include a polyalkylene glycol and a metal sulfonate, among which an EO/PO block copolymer (“EO” represents an ethylene oxide and “PO” represents a propylene oxide) such as a polyalkylene glycol having OH at both ends is preferable.
• EO represents an ethylene oxide
• PO represents a propylene oxide
• rust inhibitor examples include a metal sulfonate, a carboxylic acid, an alkanolamine, an acid amide, and a metal salt of phosphate, among which a carboxylic acid is preferable.
• detergent dispersant examples include a metal sulfonate, a metal phenate, a metal salicylate, a metal phosphonate and a succinimide.
• antifoaming agent examples include a methylsilicone, a fluorosilicone and a polyacrylate, among which a methylsilicone is preferable.
• the present composition containing the base oil blended with the above predetermined components is favorably usable as a lubricating oil for an oil-impregnated bearing in a motor of audio/video equipment or the like.
• a spindle motor for DVD-RAM, Blu-ray Disc or the like needs stable lubrication between a high-speed rotary shaft and an oil-impregnated bearing.
• wear can be reduced and sludge is unlikely to be generated even at a high temperature.
• the present composition is less volatilizable from the bearing. Therefore, the present composition contributes to a long-lasting and stable operation.
• Lubricating oil compositions were prepared in accordance with formulations shown in Tables 1 to 3.
• Base Oil 1 PAO, kinematic viscosity at 40 degrees C.: 30 mm 2 /s
• Base Oil 2 PAO, kinematic viscosity at 40 degrees C.: 17 mm 2 /s
• Compound 8 tris(2,4-C9-C10 isoalkylphenol)thiophosphate (component (B))
• Acid number was measured by an electrical potential technique according to “Determination of Lubricant Neutralization Number” defined in JIS K2501.
• Phosphorus content was measured according to JPI-5S-38-92.
• Sulfur content was measured according to JIS K 2541.
• ISOT was measured according to JIS K 2514. Specifically, a sample oil kept at 165.5 degrees C. was forcefully agitated at 1300 rpm under the presence of a steel-copper catalyst, and maintained for 24 hours while being mixed with air therearound by agitation. The sample oil was then again measured in terms of the properties (1) to (5).
• a time (min) that elapsed before the end of pressure drop was measured according to JIS K 2514.
• Evaluation was performed at room temperature using a tester defined by JASO M 314 to determine a friction coefficient.
• the test was performed according to ASTM D 4172 under the following conditions: a load of 392 N, a rotation speed of 1200 rpm, an oil temperature of 80 degrees C. and a test time of 60 minutes.
• the respective wear scar diameters of three half-inch balls were averaged to calculate an average wear scar diameter (mm) (a reported value).
• the test was performed with a Falex test machine defined by ASTM D2670 under the following conditions: a load of 890 N, a rotation speed of 1800 rpm, an oil temperature of 80 degrees C. and a test time 60 minutes, and the wear amount (mg) of a pin was measured.
• the material of the pin was AISI/SAE-3135 steel and the material of a block was AISI-1137 steel.
• the test was performed with an LFW-1 block-on-ring tester defined in, for instance, JASO M358 at room temperature and at a rotation speed of 1800 rpm and a predetermined load (10 minutes for each of step loads of 150N, 200N and 250N), and then the wear depth (mm) of the block was measured.
• a trial operation was performed at a load of 50 N and a rotation speed of 100 rpm.
• a container according to JIS K 2540 containing 1 g of a sample oil and 1 g of iron powder was left under an atmosphere with a constant temperature of 150 degrees C. for seven days, and then the evaporated amount of the sample oil was calculated, from a quantity before the test and a quantity after the test, in mass percentage relative to the amount of the sample oil as originally obtained before the test.
• the sample oils of Examples 1 to 4 each of which corresponds to the lubricating oil composition according to the invention and contains a base oil blended with the component (A), the component (B) and the component (C), are all excellent in wear resistance and evaporation characteristics and generate less sludge.

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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)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Lubricants (AREA)
• Sliding-Contact Bearings (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

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• 2013
  • 2013-07-11 KR KR1020157000882A patent/KR20150028296A/ko not_active Application Discontinuation
  • 2013-07-11 EP EP13817377.8A patent/EP2873718A4/de not_active Withdrawn
  • 2013-07-11 CN CN201380033433.0A patent/CN104395443A/zh active Pending
  • 2013-07-11 JP JP2014524873A patent/JP6055829B2/ja active Active
  • 2013-07-11 WO PCT/JP2013/069009 patent/WO2014010682A1/ja active Application Filing
  • 2013-07-11 US US14/413,309 patent/US20150166923A1/en not_active Abandoned

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