EP2479248A1 - Schmiermittelzusammensetzung - Google Patents

Schmiermittelzusammensetzung Download PDF

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Publication number
EP2479248A1
EP2479248A1 EP10817066A EP10817066A EP2479248A1 EP 2479248 A1 EP2479248 A1 EP 2479248A1 EP 10817066 A EP10817066 A EP 10817066A EP 10817066 A EP10817066 A EP 10817066A EP 2479248 A1 EP2479248 A1 EP 2479248A1
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EP
European Patent Office
Prior art keywords
mass
base
lubricating oil
terms
oil composition
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Withdrawn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
EP10817066A
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English (en)
French (fr)
Other versions
EP2479248A4 (de
Inventor
Moritsugu Kasai
Ryou Yamada
Masanori Tsujioka
Koji Miyake
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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Publication date
Application filed by Idemitsu Kosan Co Ltd filed Critical Idemitsu Kosan Co Ltd
Publication of EP2479248A1 publication Critical patent/EP2479248A1/de
Publication of EP2479248A4 publication Critical patent/EP2479248A4/de
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M163/00—Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential
    • 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
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32—Esters
    • C—CHEMISTRY; METALLURGY
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32—Esters
    • C10M105/38—Esters of polyhydroxy compounds
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    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32—Esters
    • C10M105/42—Complex esters, i.e. compounds containing at least three esterified carboxyl groups and derived from the combination of at least three different types of the following five types of compound: monohydroxy compounds, polyhydroxy compounds, monocarboxylic acids, polycarboxylic acids and hydroxy carboxylic acids
    • C10M105/46—Complex esters, i.e. compounds containing at least three esterified carboxyl groups and derived from the combination of at least three different types of the following five types of compound: monohydroxy compounds, polyhydroxy compounds, monocarboxylic acids, polycarboxylic acids and hydroxy carboxylic acids derived from the combination of monohydroxy compounds, dihydroxy compounds and dicarboxylic acids only and having no free hydroxy or carboxyl groups
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    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/50—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing halogen
    • C—CHEMISTRY; METALLURGY
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    • C10M105/50—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing halogen
    • C10M105/54—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing halogen containing carbon, hydrogen, halogen and oxygen
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    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/56—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing nitrogen
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    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/76—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing silicon
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    • 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
    • C10M141/12—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 compound containing atoms of elements not provided for in groups C10M141/02 - C10M141/10
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    • C10M159/00—Lubricating compositions characterised by the additive being of unknown or incompletely defined constitution
    • C10M159/12—Reaction products
    • C10M159/20—Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products
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    • 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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    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
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    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/027—Neutral salts thereof
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    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/028—Overbased salts thereof
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    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/14—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/144—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to carbon atoms of six-membered aromatic rings containing hydroxy groups
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    • C10M2207/26—Overbased carboxylic acid salts
    • C10M2207/262—Overbased carboxylic acid salts derived from hydroxy substituted aromatic acids, e.g. salicylates
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    • 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
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    • 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
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    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/086—Imides
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    • 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
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    • C10M2215/28—Amides; Imides
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    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/02—Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds
    • C10M2219/022—Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds of hydrocarbons, e.g. olefines
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    • C10M2219/024—Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds of esters, e.g. fats
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    • C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
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    • C10M2219/046—Overbasedsulfonic acid salts
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    • C10M2219/08—Thiols; Sulfides; Polysulfides; Mercaptals
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    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04—Phosphate esters
    • C10M2223/045—Metal containing thio derivatives
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    • C10M2223/04—Phosphate esters
    • C10M2223/047—Thioderivatives not containing metallic elements
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    • 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
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    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
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    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/54—Fuel economy
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    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/25—Internal-combustion engines
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    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2060/00—Chemical after-treatment of the constituents of the lubricating composition
    • C10N2060/14—Chemical after-treatment of the constituents of the lubricating composition by boron or a compound containing boron

Definitions

  • the present invention relates to a lubricating oil composition, more specifically to a lubricating oil composition showing, though containing a zinc dialkyldithiophosphate, a low frictional coefficient when used as a lubricating oil for a low friction sliding material.
  • various base oils and additives have so far been developed for the purpose of enhancing various performances.
  • performances required to engine oils include an appropriate viscosity characteristic, an oxidation stability, a clean dispersibility, an abrasion preventing property, a bubbling preventing property and the like, and the above performances are attempted to be elevated by combination of various base oils and additives.
  • zinc dithiophosphate (ZnDTP) is excellent as an additive for abrasion resistance and therefore is used well as an additive for engine oils.
  • materials forming a hard film such as a TiN film, a CrN film and the like which contribute to a rise in an abrasion resistance are known as materials for parts which are exposed to severe friction and abrasion environment (for example, a sliding part of an engine).
  • a friction coefficient can be reduced in the air under the absence of a lubricating oil by making use of a diamond-like carbon (DLC) film, and materials having a DLC film (hereinafter referred to as a DLC material) are expected as a low friction sliding material.
  • DLC diamond-like carbon
  • a friction-reducing effect of a DLC material is small under the presence of a lubricating oil in a certain case, and in the above case, a fuel consumption-saving effect is less liable to be obtained. Accordingly, development of a lubricating oil composition for a low friction sliding material such as DLC materials and the like has so far been carried out.
  • a lubricating oil composition which contains an ether base ashless friction-reducing agent and which is used for a low friction sliding member is disclosed in, for example, a patent document 1.
  • patent documents 2 and 3 Disclosed in patent documents 2 and 3 are techniques in which lubricating oil compositions containing fatty acid ester base ashless friction-controlling agents and aliphatic amine base ashless friction-controlling agents are used for a sliding face between a DLC member and an iron base member and a sliding face between a DLC member and an aluminum alloy member.
  • a patent document 4 Disclosed in a patent document 4 is a technique in which a low friction agent composition containing an oxygen-containing organic compound and an aliphatic amine base compound is used in a low friction sliding mechanism having a DLC coating sliding member.
  • lubricating oil compositions for low friction sliding materials have been developed, but even in a case in which the above techniques are applied, the friction coefficient tends to grow larger when ZnDTP is blended in order to enhance further the abrasion resistance and the like. Accordingly, when a purpose is to obtain a lubricating oil which is excellent in various performances and well balanced, required is a lubricating oil composition which shows, though containing ZnDTP, a low friction coefficient when used as a lubricating oil for a low friction sliding material.
  • the present invention has been made in light of the situations, and an object of the present invention is to provide a lubricating oil composition showing, though containing ZnDTP as an abrasion resistant agent, a low friction coefficient when used as a lubricating oil for a low friction sliding material, that is, a lubricating oil composition for a low friction sliding material in which an abrasion resistance is consistent with a low frictional property.
  • a lubricating oil composition showing, though containing ZnDTP as an abrasion resistant agent, a low friction coefficient when used as a lubricating oil for a low friction sliding material.
  • the lubricating oil composition of the present invention is prepared by blending a lubricant base oil with (A) an alkali earth metal salicylate and/or alkali earth metal sulfonate base cleaning agents, (B) a boron-non-containing succinimide base ashless dispersant having an alkenyl group or an alkyl group having a number average molecular weight of 500 to 4000, (C) a zinc dialkyldithiophosphate and (D) a sulfur base compound selected from polysulfide compounds, sulfurized oil & fats, olefin sulfides, thiophosphoric esters, thiophosphorous esters and amine salts of the esters as essential additives in specific amounts, and it is used as a lubricating oil for a low friction sliding material.
  • A an alkali earth metal salicylate and/or alkali earth metal sulfonate base cleaning agents
  • B a boron-non-containing succ
  • the lubricant base oil used in the present invention shall not specifically be restricted, and there can be used base oils suitably selected from publicly known mineral base oils and synthetic base oils which have so far been used.
  • capable of being listed as the mineral base oils are, for example, distillate oils obtained by distilling paraffin base crude oils, intermediate base crude oils or naphthene base crude oils at atmospheric pressure or subjecting residual oils obtained by atmospheric distillation to distillation under reduced pressure, or refined oils obtained by refining the above distillate oils according to an ordinary method, for example, solvent-refined oils, hydrogenation-refined oils, dewaxing-treated oils, white clay-treated oils and the like.
  • poly( ⁇ -olefins) which are ⁇ -olefin oligomers having 8 to 14 carbon atoms, polybutene, polyol esters, alkylbenzenes and the like can be listed as the synthetic oils.
  • the mineral oils may be used alone or in combination of two or more kinds thereof as the base oil.
  • the synthetic oils may be used alone or in combination of two or more kinds thereof.
  • at least one mineral oil and at least one synthetic oil may be used in combination.
  • the base oil has a kinetic viscosity of usually 2 to 50 mm 2 /s, preferably 3 to 30 mm 2 /s and particularly preferably 3 to 15 mm 2 /s at 100°C. If the kinetic viscosity at 100°C is 2 mm 2 /s or more, the vaporization loss is small. On the other hand, if it is 50 mm 2 /s or less, the power loss brought about by the viscous resistance is inhibited, and the fuel consumption-improving effect is exerted well. Further, the above base oil has a viscosity index of preferably 60 or more, more preferably 70 or more and particularly preferably 80 or more. If the viscosity index is 60 or more, a viscosity change of the base oil brought about by temperature is small, and the stable lubricating performances are exerted.
  • alkali earth metal salicylate and alkali earth metal sulfonate which are used as the cleaning agents of the component (A).
  • the alkali earth metal includes calcium, magnesium and the like, and calcium is particularly preferred. Any of neutral salts, basic salts and perbasic salts can be used as the cleaning agents, and they may be used alone or in combination of two or more kinds thereof.
  • a whole base number of the cleaning agent can optionally be selected according to the required performances of the lubricating oil composition. It is usually 0 to 500 mg KOH/g, preferably 50 to 400 mg KOH/g measured by a perchloric acid method.
  • a blending amount of the cleaning agent based on a whole amount of the compositions is 0.05 to 0.25% by mass, preferably 0.06 to 0.25% by mass and more preferably 0.1 to 0.22% by mass in terms of alkali earth metal concentration. If the alkali earth metal concentration exceeds 0.25% by mass, it is difficult to reduce the friction coefficient.
  • Compounds other than the component (A) are also publicly known as the alkali earth metal-containing cleaning agent, and they include, for example, alkali earth metal phenate base cleaning agents.
  • alkali earth metal phenate base cleaning agent if the alkali earth metal phenate base cleaning agent is blended, it is difficult to reduce the friction coefficient, and therefore use thereof has to be restricted in the present invention.
  • a content thereof based on a whole amount of the compositions is 0.1% by mass or less, preferably 0.05% by mass or less in terms of alkali earth metal concentration, and it is particularly preferably not added at all.
  • the boron-non-containing succinimide compound (hereinafter the succinimide compound shall be referred to as "the succinimide compound of the present invention") having an alkenyl group or an alkyl group of a number average molecular weight of 500 to 4000 is blended as the ashless dispersant of the component (B). If a number average molecular weight of an alkenyl group or an alkyl group is 500 or more, the good cleaning effect is exerted, and if it is 4000 or less, the low temperature fluidity is good.
  • the succinimide compound of the present invention includes, for example, a compound represented by the following a general formula (II) or a general formula (III):
  • R 3 to R 5 in the general formulae (II) and (III) each represent independently an alkenyl group or an alkyl group of a number average molecular weight of 500 to 4000, and "m” represents an integer of 1 to 5. If “m” is an integer of 1 to 5, the cleaning property is enhanced, and “m” is more preferably an integer of 2 to 4.
  • R 3 to R 5 in the general formulae (II) and (III) include, for example, an alkenyl group or an alkyl group originating in polybutene and the like obtained by polymerizing high purity isobutene or a mixture of 1-butene and isobutene by a boron fluoride base catalyst or an aluminum chloride base catalyst.
  • a production method of the succinimide compound of the present invention shall not specifically be restricted, and it can be obtained, for example, by reacting butenylsuccinic acid obtained by reacting polybutene or chlorinated polybutene with maleic anhydride at 100 to 200°C with polyamine such as diethylenetriamine, triethylenetetraamine, tetraethylenepentaamine, pentaethylenehexamine and the like.
  • the polybutene and the like which are precursors of the alkenyl group or the alkyl group are advantageously used after trace amounts of remaining fluorine substances and chlorine substances originating in a catalyst used in a production step have been removed up to usually 50 ppm by mass or less, preferably 10 ppm by mass or less and particularly preferably 1 ppm by mass or less by a suitable method such as an adsorbing method, sufficient washing with water and the like.
  • the boron-non-containing succinimide compound is used as described above.
  • the term "boron-non-containing" means that a succinimide compound treated by a boron compound is excluded from the component (B) in the present application. That is, a boron-containing polybutenylsuccinimide compound obtained by reacting a polybutenylsuccinimide compound with a boron compound such as boric acid, borates, boric esters and the like to neutralize a part or all of a remaining amino group and/or imino group is known as an ashless dispersant.
  • blending of the above boron-containing polybutenylsuccinimide compound makes it difficult to reduce the abrasion when it is used as a lubricating oil for a low friction sliding material.
  • the succinimide compound in the present invention may be used alone or in combination of two or more kinds thereof.
  • a blending amount of the succinimide compound in the present invention is 0.03 to 0.50% by mass, preferably 0.05 to 0.30% by mass in terms of nitrogen concentration based on a whole amount of the compositions. If the nitrogen concentration falls in the range, the effects preferred in terms of a balance between the cleaning property, the resistance in emulsifying and the economical efficiency are obtained.
  • a content thereof is 0.04% by mass or less, preferably 0.02% by mass or less in terms of nitrogen concentration based on a whole amount of the compositions, and it is particularly preferably not added at all.
  • the zinc dialkyldithiophosphate of the component (C) includes, for example, a compound represented by a general formula (IV):
  • R 6 to R 9 each represent independently an alkyl group, and an alkyl group having 1 to 24 carbon atoms is preferably used.
  • the alkyl group having 1 to 24 carbon atoms may be any of linear, branched and cyclic groups and includes, to be specific, methyl, ethyl and in addition thereto, various kinds each including isomers, such as propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, icosyl, henicosyl, docosyl, tricosyl and tetracosyl, or cyclopentyl, cyclohexyl, cycloheptyl and alkyl-substituted groups thereof.
  • the specific examples of the zinc dialkyldithiophosphate represented by the general formula (IV) include, for example, zinc diisopropyldithiophosphate, zinc diisobutyldithio phosphate, zinc di-sec-butyldithiophosphate, zinc di-sec-pentyldithiophosphate, zinc di-n-hexyldithiophosphate, zinc di-sec-hexyldithiophosphate, zinc di-octyldithiophosphate, zinc di-2-ethylhexyldithiophosphate, zinc di-n-decyldithio phosphate, zinc di-n-dodecyldithiophosphate, zinc diisotridecyldithiophosphate and the like.
  • zinc di-sec-alkyldithiophosphates are suited in terms of an enhancing effect of the abrasion resistance.
  • the zinc dialkyldithiophosphate may be blended alone or in combination of two or more kinds thereof.
  • a blending amount of the zinc dialkyldithiophosphate based on a whole amount of the compositions is 0.01 to 0.12% by mass, preferably 0.03 to 0.10% by mass in terms of phosphorus concentration.
  • the abrasion resistance and the high temperature cleaning property are enhancing by blending the zinc dialkyldithiophosphate, but if it exceeds 0.12% by mass in terms of phosphorus concentration, it is difficult to reduce the abrasion coefficient.
  • the sulfur base compound of the component (D) is a compound selected from polysulfide compounds, sulfurized oil & fats, olefin sulfides, thiophosphoric esters, thiophosphorous esters and amine salts of the esters.
  • the polysulfide compounds are preferred, and a compound represented by the general formula (I) is particularly preferred: R 1 -S n -R 2 (I)
  • R 1 and R 2 each represent independently an alkyl group or an aralkyl group.
  • R 1 and R 2 are preferably a group having 4 to 24 carbon atoms, more preferably a group having 8 to 18 carbon atoms.
  • the sulfur base compound may be used alone or in combination of two or more kinds thereof as the base oil.
  • a blending amount of the sulfur base compound based on a whole amount of the compositions is 0.02 to 2.0% by mass, preferably 0.02 to 1.0% by mass in terms of sulfur concentration. Either when the blending amount is less than 0.02% by mass or when it exceeds 2.0% by mass, it is difficult to reduce the friction coefficient.
  • the lubrication oil composition of the present invention may be blended with additives which have so far been publicly known as long as the effects of the present invention are not damaged, and they include, for example, friction-reducing agents, viscosity index-improving agents, pour point depressants, antioxidants, rust preventives and the like.
  • the friction-reducing agents include ashless friction-reducing agents such as fatty acid esters, aliphatic amines, higher alcohols and the like.
  • viscosity index-improving agents are, to be specific, so-called non-dispersion type viscosity index-improving agents such as copolymers according to various methacrylic esters or optional combinations thereof and hydrogenated products thereof and so-called dispersion type viscosity index-improving agents obtained by copolymerizing various methacrylic esters including nitrogen compounds.
  • non-dispersion type or dispersion type ethylene- ⁇ -olefin copolymers capable of being shown as the examples thereof are non-dispersion type or dispersion type ethylene- ⁇ -olefin copolymers (the ⁇ -olefin includes, for example, propylene, 1-butene, 1-pentene and the like) and hydrogenated products thereof, polyisobutylene and hydrogenated products thereof, styrene-diene hydrogenated copolymers, styrene-maleic anhydride ester copolymers, polyalkylstyrenes and the like.
  • the molecular weights of the above viscosity index-improving agents have to be selected considering the shearing stability.
  • a number average molecular weight of the above viscosity index-improving agents is 5000 to 1000000, preferably 100000 to 800000 in a case of, for example, the dispersion type or non-dispersion type polymethacrylates; 800 to 5000 in a case of polyisobutylene or the hydrogenated products thereof; and 800 to 300000, preferably 10000 to 200000 in a case of the ethylene- ⁇ -olefin copolymers and the hydrogenated products thereof.
  • the viscosity index-improving agents can be added alone or in optional combination of plural kinds thereof, and a content thereof is usually 0.1 to 40.0% by mass based on a whole amount of the lubricating oil composition.
  • the pour point depressants include, for example, polymethacrylates.
  • the antioxidant includes phenol base antioxidants and amine base antioxidants.
  • the phenol base antioxidants include, for example, 4,4'-methylenebis(2,6-di-t-butylphenol); 4,4'-bis(2,6-di-t-butylphenol); 4,4'-bis(2-methyl-6-t-butylphenol); 2,2'-methylenebis(4-ethyl-6-t-butylphenol); 2,2'-methylenebis(4-methyl-6-t-butylphenol); 4,4'-butylidenebis(3-methyl-6-t-butylphenol); 4,4'-isopropylidenebis(2,6-di-t-butylphenol); 2,2'-methylenebis(4-methyl-6-nonylphenol); 2,2'-isobutylidenebis(4,6-dimethylphenol); 2,2'-methylenebis(4-methyl-6-cyclohexylphenol); 2,6-di-t-butyl-4-methylphenol;
  • the amine base antioxidants include, for example, monoalkyldiphenylamines such as monooctyldiphenylamine, monononyldiphenylamine and the like; dialkyldiphenylamines such as 4,4'-dibutyldiphenylamine, 4,4'-dipentyldiphenylamine, 4,4'-dihexyldiphenylamine, 4,4'-diheptyldiphenylamine, 4,4'-diocyldiphenylamine, 4,4'-dinonyldiphenylamine and the like; polyalkyldiphenylamines such as tetrabutyldiphenylamine, tetrahexyldiphenylamine, tetraoctyldiphenylamine, tetranonyldiphenylamine and the like; naphthyl amine base antioxidants, to be specific, ⁇ -naphthylamine, pheny
  • the dialkyldiphenylamine base antioxidants and the naphthylamine base antioxidants are suited.
  • the rust preventives include alkylbenzenesulfonates, dinonylnaphthalenesulfonates, alkenylsuccinic esters, polyhydric alcohol esters and the like.
  • the lubricating oil composition of the present invention is applied to a sliding face having a low friction sliding material and can provide it with an excellent low friction property, and particularly when applied to internal combustion engines, they can be provided with a fuel consumption-saving effect.
  • the sliding face having a low friction sliding material is particularly preferably a sliding face having a DLC material as the low friction sliding material at one side thereof.
  • the opposite material shall not specifically be restricted, and a sliding face between, for example, the above DLC material and the iron base material and a sliding face between the DLC material and the aluminum alloy material can be listed.
  • the DLC material has a DLC film on a surface.
  • the DLC material constituting the above film is an amorphous material constituted principally from a carbon element, and a bonding form of carbons themselves comprises both of a diamond structure (SP 3 bond) and a graphite bond (SP 2 bond).
  • a bonding form of carbons themselves comprises both of a diamond structure (SP 3 bond) and a graphite bond (SP 2 bond).
  • SP 3 bond diamond structure
  • SP 2 bond graphite bond
  • it includes a-C (amorphous carbon) comprising only a carbon element, a-C:H (hydrogen amorphous carbon) containing hydrogen and MeC containing partially a metal element such as titanium (Ti), molybdenum (Mo) and the like.
  • carburized steel SCM420, SCr420 (JIS) and the like can be listed as the iron base material.
  • a hypoeutectic aluminum alloy containing 4 to 20% by mass of silicon and 1.0 to 5.0% by mass of copper or a hypereutectic aluminum alloy is preferably used as the aluminum alloy material.
  • AC2A, AC8A, ADC12, ADC14 (JIS) and the like can be listed.
  • each surface roughness of the DLC material, the iron base material or the DLC material and the aluminum alloy material each is suitably 0.1 ⁇ m or less in terms of an arithmetic average roughness Ra from the viewpoint of a stability of sliding.
  • the DLC material has preferably a surface hardness of HV 1000 to 3500 in terms of a micro-Vickers hardness (98 mN load) and a thickness of 0.3 to 2.0 ⁇ m.
  • the iron base material has preferably a surface hardness of HRC 45 to 60 in terms of a Rockwell hardness (C scale). In this case, a durability of the film can be maintained even on a sliding condition of about 700 MPa under a high face pressure as is the case with a cam follower member, and therefore it is effective.
  • the aluminum alloy material has preferably a surface hardness of HB 80 to 130 in terms of a Brinell hardness. If a surface hardness and a thickness of the DLC material fall in the ranges, abrasion and peeling are inhibited. Further, if a surface hardness of the iron base material is HRC 45 or more, it can be inhibited from buckling and peeling under a high face pressure. On the other hand, if a surface hardness of the aluminum alloy material falls in the range, the aluminum alloy material is inhibited from abrading.
  • the sliding part to which the lubricating oil composition of the present invention is applied shall not specifically be restricted as long as it is a surface in which two metal surfaces are brought into contact and in which at least one of them has a low friction sliding material, and a sliding part of an internal combustion engine can be preferably listed.
  • a sliding part of an internal combustion engine can be preferably listed.
  • the DLC member includes, for example, discoid shims and lifter crestal planes each obtained by coating DLC on a base plate of a steel material, and the iron base material includes low alloy chilled cast irons, carburized steels or quenched and tempered carbon steels and cam lobes prepared by using materials obtained according to optional combinations thereof.
  • the lubricating oil compositions of the invention 1 each having compositions shown in Table 1 were prepared and subjected to a frictional characteristic test shown below to determine a friction coefficient. The results thereof are shown in Table 2.
  • a reciprocating friction test equipment (SRV reciprocating friction test equipment manufactured by Optimal Inc.) was used to measure the friction coefficient by the following method.
  • a disc ( ⁇ 24 mm ⁇ 7.9 mm) on which DLC was coated was used as a test piece, and several droplets of the sample oil (lubricating oil composition) were dropped thereon.
  • the friction coefficient was determined on the conditions of a load of 400N, an amplitude of 1.5 mm, a frequency of 50 Hz and a temperature of 80°C in a state in which a cylinder ( ⁇ 15 mm ⁇ 22 mm) made of SCM420 was set on an upper part of the disc.
  • Lubricant base oil hydrocracked mineral oil (kinematic viscosity at 100°C: 4.47 mm 2 /s)
  • Ca sulfonate (1) Ca sulfonate (Ca content: 15.2% by mass)
  • Ca sulfonate (2) Ca sulfonate (Ca content: 12.0% by mass)
  • Ca phenate Ca phenate (Ca content: 9.25% by mass)
  • Boron-non-containing succinimide (1) boron-non-containing polybutenylsuccinimide (nitrogen content: 2.1% by mass, number average molecular weight of a polybutenyl group: 1000) represented by the formula (III) Boron-non-containing succinimide (2): boron-non-containing polybutenylsuccinimide (nitrogen content: 2.
  • the lubricating oil composition of the present invention is applied to a sliding face comprising a low friction sliding material such as a DLC material and can provide it with an excellent low friction characteristic, and particularly when applied to internal combustion engines, they can be provided with a fuel consumption-saving effect.
  • a low friction sliding material such as a DLC material

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EP2826845A4 (de) * 2012-03-16 2015-12-09 Idemitsu Kosan Co Schmierölzusammensetzung und gleitmechanismus mit der schmierölzusammensetzung

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CN104145010B (zh) * 2012-03-12 2016-08-31 出光兴产株式会社 润滑油组合物
KR101974660B1 (ko) * 2013-04-26 2019-05-02 에스케이이노베이션 주식회사 산화 안정성 및 색상안정성이 우수한 윤활유 조성물
JP6655284B2 (ja) * 2014-12-11 2020-02-26 シェルルブリカンツジャパン株式会社 潤滑油組成物
CA2938020C (en) * 2015-08-26 2023-07-04 Infineum International Limited Lubricating oil compositions
JP6849204B2 (ja) * 2016-03-30 2021-03-24 出光興産株式会社 潤滑油組成物
JP6265355B2 (ja) * 2017-01-05 2018-01-24 出光興産株式会社 潤滑油および潤滑システム
CN113166674A (zh) * 2019-02-22 2021-07-23 引能仕株式会社 冷冻机油及冷冻机用工作流体组合物
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EP2826845A4 (de) * 2012-03-16 2015-12-09 Idemitsu Kosan Co Schmierölzusammensetzung und gleitmechanismus mit der schmierölzusammensetzung

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