WO2011033953A1 - Composition lubrifiante - Google Patents

Composition lubrifiante Download PDF

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Publication number
WO2011033953A1
WO2011033953A1 PCT/JP2010/065136 JP2010065136W WO2011033953A1 WO 2011033953 A1 WO2011033953 A1 WO 2011033953A1 JP 2010065136 W JP2010065136 W JP 2010065136W WO 2011033953 A1 WO2011033953 A1 WO 2011033953A1
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WO
WIPO (PCT)
Prior art keywords
mass
lubricating oil
terms
oil composition
alkaline earth
Prior art date
Application number
PCT/JP2010/065136
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English (en)
Japanese (ja)
Inventor
杜継 葛西
山田　亮
正憲 辻岡
三宅　浩二
Original Assignee
出光興産株式会社
日本アイ・ティ・エフ株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 出光興産株式会社, 日本アイ・ティ・エフ株式会社 filed Critical 出光興産株式会社
Priority to CN201080041843.6A priority Critical patent/CN102597194B/zh
Priority to EP10817066.3A priority patent/EP2479248A4/fr
Priority to US13/395,668 priority patent/US20120172266A1/en
Publication of WO2011033953A1 publication Critical patent/WO2011033953A1/fr

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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
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • 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
    • 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
    • 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
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
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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
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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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
    • 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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    • 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
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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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    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/027—Neutral salts thereof
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    • C10M2207/028—Overbased salts thereof
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    • 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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    • C10M2207/262—Overbased carboxylic acid salts derived from hydroxy substituted aromatic acids, e.g. salicylates
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    • 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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    • C10M2215/086—Imides
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    • 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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    • C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
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    • C10M2219/046—Overbasedsulfonic acid salts
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    • 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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    • 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, and more particularly to a lubricating oil composition that contains zinc dithiophosphate but exhibits a low coefficient of friction when used as a lubricating oil for low friction sliding materials.
  • the performance required for engine oil includes appropriate viscosity characteristics, oxidation stability, clean dispersibility, antiwear, antifogging, etc., and these performances can be improved by combining various base oils and additives. Is planned.
  • zinc dithiophosphate (ZnDTP) is often used as an engine oil additive because it is excellent as an antiwear additive.
  • the sliding material as a material for a part having a severe frictional wear environment (for example, a sliding part of an engine), there is a material having a hard film such as a TiN film or a CrN film that contributes to an improvement in wear resistance.
  • a material having a hard film such as a TiN film or a CrN film that contributes to an improvement in wear resistance.
  • the friction coefficient can be lowered by using a diamond-like carbon (DLC) film in the air and in the absence of a lubricating oil, and a material having a DLC film (hereinafter referred to as a DLC material) has a low friction sliding property.
  • a DLC material a material having a DLC film
  • Patent Document 1 discloses a lubricating oil composition used for a low friction sliding member containing an ether-based ashless friction reducing agent.
  • Patent Documents 2 and 3 include a fatty acid ester-based ashless friction modifier and an aliphatic amine-based ashless friction adjustment on the sliding surface between the DLC member and the iron base member and the sliding surface between the DLC member and the aluminum alloy member.
  • Patent Document 4 discloses a technique using a low friction agent composition containing an oxygen-containing organic compound or an aliphatic amine compound in a low friction sliding mechanism having a DLC coating sliding member.
  • Lubricating oil compositions for low-friction sliding materials have been developed in this way, but even when these technologies are applied, the friction coefficient can be increased by adding ZnDTP to further improve wear resistance. Tended to be larger. Therefore, for the purpose of obtaining a lubricating oil having various performance and good balance, a lubricating oil composition containing ZnDTP but having a low friction coefficient when used as a lubricating oil for a low friction sliding material. Things are sought.
  • JP 2006-36850 A Japanese Patent Laid-Open No. 2003-238882 Japanese Patent Application Laid-Open No. 2004-155891 JP 2005-98495 A
  • the present invention has been made in view of the above circumstances, and contains a lubricating oil composition that exhibits a low coefficient of friction when used as a lubricating oil for low friction sliding materials while containing ZnDTP as an antiwear agent.
  • An object of the present invention is to provide a lubricating oil composition for a low friction sliding material that has both wear and low friction properties.
  • the present invention has been completed based on such findings. That is, the present invention 1.
  • Boron-free succinic acid having (A) alkaline earth metal salicylate and / or alkaline earth metal sulfonate detergent, (B) alkenyl group or alkyl group having a number average molecular weight of 500 to 4000 Formulated with imide-based ashless dispersant, (C) zinc dialkyldithiophosphate and (D) polysulfide compound, sulfurized oil, sulfurized olefin, thiophosphate, thiophosphite, and amine salts of these esters
  • the blending amount of the composition based on the total amount of the composition is such that (A) component is 0.05 to 0.25% by mass in terms of alkaline earth metal concentration, and (B) component is nitrogen concentration 0.03 to 0.50 mass% in terms of conversion, component (
  • Sulfur compounds are represented by the general formula (I) R 1 -S n -R 2 (I) (Wherein n represents an integer selected from 1 to 4, and R 1 and R 2 each independently represents an alkyl group or an aralkyl group)
  • the lubricating oil composition according to 1 above which is a compound represented by: 5.
  • the lubricating oil composition as described in 1 above, wherein the low friction sliding material is a material having a diamond-like carbon (DLC) film.
  • DLC diamond-like carbon
  • a lubricating oil composition having a low friction coefficient when used as a lubricating oil for a low friction sliding material while containing ZnDTP as an antiwear agent.
  • the lubricating oil composition of the present invention comprises (A) an alkaline earth metal salicylate and / or alkaline earth metal sulfonate detergent as essential additives in the lubricating base oil, and (B) a number average molecular weight of 500 to 4000.
  • the lubricating base oil used by this invention can select suitably from well-known mineral base oil and synthetic base oil used conventionally.
  • the mineral oil for example, a distillate obtained by atmospheric distillation of paraffinic crude oil, intermediate crude oil or naphthenic crude oil, or vacuum distillation residual oil, or The refined oil obtained by refine
  • examples of the synthetic oil include poly ( ⁇ -olefin) which is an ⁇ -olefin oligomer having 8 to 14 carbon atoms, polybutene, polyol ester, and alkylbenzene.
  • the base oil one kind of the above mineral oil may be used, or two or more kinds may be used in combination.
  • the said synthetic oil may be used 1 type and may be used in combination of 2 or more type. Further, one or more mineral oils and one or more synthetic oils may be used in combination.
  • the base oil those having a kinematic viscosity at 100 ° C. of usually 2 to 50 mm 2 / s, preferably 3 to 30 mm 2 / s, particularly preferably 3 to 15 mm 2 / s are advantageous.
  • the kinematic viscosity at 100 ° C. is 2 mm 2 / s or more, the evaporation loss is small, and when it is 50 mm 2 / s or less, the power loss due to the viscous resistance is suppressed, and the fuel efficiency improvement effect is exhibited well.
  • the base oil preferably has a viscosity index of 60 or more, more preferably 70 or more, and particularly preferably 80 or more. When the viscosity index is 60 or more, the viscosity change due to the temperature of the base oil is small, and stable lubricating performance is exhibited.
  • alkaline earth metal salicylate and alkaline earth metal sulfonate used as the detergent for the component (A) conventionally known compounds such as compounds having an alkyl group can be used.
  • alkaline earth metal include calcium and magnesium, and calcium is particularly preferable.
  • these detergents any of neutral salts, basic salts and overbased salts can be used, and one kind may be used alone, or two or more kinds may be used in combination. .
  • the total base number of the detergent can be arbitrarily selected according to the required performance of the lubricating oil composition.
  • the perchloric acid method is 0 to 500 mgKOH / g, preferably 50 to 400 mgKOH / g.
  • the blending amount of the detergent based on the total amount of the composition is 0.05 to 0.25% by mass in terms of alkaline earth metal concentration, preferably 0.06 to 0.25% by mass, more preferably 0.8%. It is 1 to 0.22% by mass. If the alkaline earth metal concentration exceeds 0.25% by mass, it is difficult to reduce the friction coefficient.
  • alkaline earth metal-containing detergent compounds other than the component (A) are also known, and examples thereof include alkaline earth metal phenate detergents.
  • alkaline earth metal phenate detergents when an alkaline earth metal phenate detergent is blended, it is difficult to reduce the friction coefficient. Therefore, in the present invention, it is necessary to limit its use.
  • the content based on the total amount of the composition is 0.1% by mass or less, preferably 0.05% by mass or less, particularly preferably not contained at all, in terms of alkaline earth metal concentration.
  • a boron-free succinimide compound having an alkenyl group or alkyl group having a number average molecular weight of 500 to 4000 (hereinafter, the succinimide compound is referred to as “the present invention”).
  • the number average molecular weight of the alkenyl group or alkyl group is 500 or more, a good cleansing effect is exhibited, and when it is 4000 or less, the low temperature fluidity is good.
  • the succinimide compound of the present invention include the following general formula (II) or general formula (III):
  • R 3 to R 5 each independently represents an alkenyl group or an alkyl group having a number average molecular weight of 500 to 4000, and m represents an integer of 1 to 5.
  • m is an integer of 1 to 5, the cleanliness is improved, and an integer of 2 to 4 is more preferable.
  • R 3 to R 5 in the general formulas (II) and (III) are, for example, polybutene obtained by polymerizing a high purity isobutene or a mixture of 1-butene and isobutene with a boron fluoride catalyst or an aluminum chloride catalyst, etc.
  • the method for producing the succinimide compound of the present invention is not particularly limited.
  • butenyl succinic acid obtained by reacting polybutene or a chlorinated polybutene with maleic anhydride at about 100 to 200 ° C. is converted into diethylenetriamine, triethylene or triethylene. It can be obtained by reacting with polyamines such as ethylenetetramine, tetraethylenepentamine and pentaethylenehexamine.
  • the polybutene or the like that is a precursor of an alkenyl group or an alkyl group is usually removed by an appropriate method such as an adsorption method or sufficient washing with water by removing a trace amount of fluorine and chlorine remaining due to a catalyst in the production process. It is advantageous to use after removing to 50 mass ppm or less, preferably 10 mass ppm or less, particularly preferably 1 mass ppm or less.
  • a succinimide compound containing no boron is used.
  • This boron-free means that the succinimide compound treated with the boron compound is excluded from the component (B). That is, as an ashless dispersant, a boron compound such as boric acid, borate, and boric acid ester is allowed to act on a polybutenyl succinimide compound so that a part or all of the remaining amino groups and / or imino groups can be added.
  • Boron-containing polybutenyl succinimide compounds are known, but when such boron-containing polybutenyl succinimide is blended, friction is reduced when used as a lubricant for low friction sliding materials. Becomes difficult.
  • one kind of the succinimide compound of the present invention may be blended, or two or more kinds may be blended in combination.
  • the blending amount of the succinimide compound of the present invention based on the total amount of the composition is 0.03 to 0.50 mass%, preferably 0.05 to 0.30 mass% in terms of nitrogen concentration. When the nitrogen concentration is within the above range, favorable effects can be obtained in terms of the balance of cleanliness, demulsibility and economic efficiency.
  • the content based on the total amount of the composition is 0.04% by mass or less, preferably 0.02% by mass in terms of nitrogen concentration, and it is particularly preferable that no content is contained at all.
  • Examples of the (C) component zinc dialkyldithiophosphate include, for example, the general formula (IV)
  • R 6 to R 9 each independently represents an alkyl group, preferably an alkyl group having 1 to 24 carbon atoms.
  • the alkyl group having 1 to 24 carbon atoms may be linear, branched or cyclic, and specifically includes various propyl groups and butyl groups including isomers including methyl and ethyl groups.
  • zinc dialkyldithiophosphate represented by the general formula (IV) include, for example, zinc diisopropyldithiophosphate, zinc diisobutyldithiophosphate, zinc di-sec-butyldithiophosphate, zinc di-sec-pentyldithiophosphate, di- zinc n-hexyldithiophosphate, zinc di-sec-hexyldithiophosphate, zinc di-octyldithiophosphate, zinc di-2-ethylhexyldithiophosphate, zinc di-n-decyldithiophosphate, zinc di-n-dodecyldithiophosphate, Examples include zinc diisotridecyl dithiophosphate. Among these, zinc dialkyldithiophosphate having a secondary alkyl group is preferable from the viewpoint of the effect of improving wear resistance.
  • the zinc dialkyldithiophosphate may be blended in one kind or in combination of two or more kinds.
  • the blending amount of zinc dialkyldithiophosphate based on the total amount of the composition is 0.01 to 0.12% by mass, preferably 0.03 to 0.10% by mass in terms of phosphorus concentration.
  • the sulfur compound of the component (D) is a compound selected from polysulfide compounds, sulfurized fats and oils, sulfurized olefins, thiophosphate esters, thiophosphite esters, and amine salts of these esters.
  • polysulfide compounds are preferred, and in particular, the general formula (I) R 1 -S n -R 2 (I) The compound shown by these is preferable.
  • n represents an integer selected from 1 to 4, and n is particularly preferably 2 or 3.
  • R 1 and R 2 each independently represents an alkyl group or an aralkyl group.
  • R 1 and R 2 are preferably a group having 4 to 24 carbon atoms, and more preferably a group having 8 to 18 carbon atoms.
  • the sulfur compounds may be used alone or in combination of two or more.
  • the compounding amount of the sulfur-based compound based on the total amount of the composition is 0.02 to 2.0% by mass, preferably 0.02 to 1.0% by mass in terms of sulfur concentration. Even when the amount is less than 0.02% by mass or more than 2.0% by mass, it is difficult to reduce the friction coefficient.
  • the lubricating oil composition of the present invention may be blended with conventionally known additives as long as the effects of the present invention are not impaired, for example, friction reducers, viscosity index improvers, pour point depressants, antioxidants, An antirust agent etc. are mentioned.
  • friction reducers examples include ashless friction reducing agents such as fatty acid esters, aliphatic amines, and higher alcohols.
  • viscosity index improver include so-called non-dispersion type viscosity index improvers such as various methacrylate esters or copolymers and hydrogenated products thereof, and various nitrogen compounds.
  • Examples thereof include a so-called dispersed viscosity index improver obtained by copolymerizing a methacrylic acid ester. Further, non-dispersed or dispersed ethylene- ⁇ -olefin copolymers (for example, propylene, 1-butene, 1-pentene etc.) and hydrides thereof, polyisobutylene and hydrogenated products thereof, styrene- Examples thereof include diene hydrogenated copolymers, styrene-maleic anhydride copolymers, and polyalkylstyrenes. The molecular weight of these viscosity index improvers needs to be selected in consideration of shear stability.
  • the number average molecular weight of the viscosity index improver is, for example, 5000 to 1000000, preferably 100000 to 800000 for dispersed and non-dispersed polymethacrylates, 800 to 5000 for polyisobutylene or a hydride thereof, ethylene-
  • the ⁇ -olefin copolymer and its hydride are 800 to 300,000, preferably 10,000 to 200,000.
  • Such a viscosity index improver can be contained alone or in any combination of two or more kinds, but the content is usually about 0.1 to 40.0% by mass based on the total amount of the lubricating oil composition. is there.
  • the pour point depressant include polymethacrylate.
  • antioxidants include phenolic antioxidants and amine antioxidants.
  • phenolic antioxidants include 4,4′-methylenebis (2,6-di-t-butylphenol); 4,4′-bis (2,6-di-t-butylphenol); 4,4′- Bis (2-methyl-6-tert-butylphenol); 2,2′-methylenebis (4-ethyl-6-tert-butylphenol); 2,2′-methylenebis (4-methyl-6-tert-butylphenol); 4 4,4′-butylidenebis (3-methyl-6-tert-butylphenol); 4,4′-isopropylidenebis (2,6-di-tert-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- 2,6-di-t-butan
  • amine antioxidants include monooctyl diphenylamine; monoalkyl diphenylamines such as monononyl diphenylamine; 4,4′-dibutyldiphenylamine; 4,4′-dipentyldiphenylamine; 4,4′-dihexyldiphenylamine; 4,4′-diheptyldiphenylamine; 4,4′-dioctyldiphenylamine; dialkyldiphenylamines such as 4,4′-dinonyldiphenylamine; tetrabutyldiphenylamine; tetrahexyldiphenylamine; tetraoctyldiphenylamine; polyalkyldiphenylamine such as tetranonyldiphenylamine And naphthylamine type, specifically ⁇ -naphthylamine; phenyl- ⁇ -naphthylamine; and butylphenyl
  • dialkyldiphenylamine type and naphthylamine type are preferable.
  • the rust inhibitor include alkyl benzene sulfonate, dinonyl naphthalene sulfonate, alkenyl succinate, polyhydric alcohol ester and the like.
  • the lubricating oil composition of the present invention is applied to a sliding surface having a low-friction sliding material and can impart excellent low-friction characteristics, and particularly when applied to an internal combustion engine, provides a fuel-saving effect. can do.
  • a sliding surface having the low friction sliding material one having a DLC material as a low friction sliding material on one side is particularly preferable.
  • the mating material is not particularly limited, and examples thereof include a sliding surface between the DLC material and the iron-based material or a sliding surface between the DLC material and the aluminum alloy material.
  • the DLC material has a DLC film on the surface, and the DLC material constituting the film is amorphous mainly composed of carbon element, and the bonding form between carbons is a diamond structure (SP 3 bond). ) And graphite bonds (SP 2 bonds).
  • aC amorphous carbon
  • aC hydrogen amorphous carbon
  • some metal elements such as titanium (Ti) and molybdenum (Mo).
  • examples of the iron base material include carburized steel SCM420 and SCr420 (JIS).
  • the aluminum alloy material a hypoeutectic aluminum alloy or a hypereutectic aluminum alloy containing 4 to 20% by mass of silicon and 1.0 to 5.0% by mass of copper is preferably used.
  • AC2A, AC8A, ADC12, ADC14 (JIS), etc. can be mentioned.
  • the surface roughness of each of the DLC material and the iron base material, or the DLC material and the aluminum alloy material is preferably an arithmetic average roughness Ra of 0.1 ⁇ m or less from the viewpoint of sliding stability. is there.
  • the DLC material preferably has a surface hardness of Hv 1000 to 3500 in micro Vickers hardness (98 mN load) and a thickness of 0.3 to 2.0 ⁇ m.
  • the iron-based material preferably has a surface hardness of HRC45-60 in terms of Rockwell hardness (C scale). This case is effective because the durability of the film can be maintained even under sliding conditions under a high surface pressure of about 700 MPa as in a cam follower member.
  • the aluminum alloy material preferably has a surface hardness of Brinell hardness HB 80 to 130.
  • the surface hardness and thickness of the DLC material are within the above ranges, abrasion and peeling are suppressed. Further, when the surface hardness of the iron-based material is HRC45 or more, it is possible to suppress buckling and peeling under high surface pressure. On the other hand, if the surface hardness of the aluminum alloy material is within the above range, the wear of the aluminum alloy is suppressed.
  • the sliding part to which the lubricating oil composition of the present invention is applied is not particularly limited as long as two metal surfaces are in contact with each other and at least one of them has a low friction sliding material.
  • the sliding part of an engine can be mentioned preferably. In this case, it is effective because a low friction characteristic which is extremely excellent as compared with the conventional case is obtained and a fuel saving effect is exhibited.
  • the DLC member a disk-shaped shim or lifter crown surface coated with DLC on a steel material substrate is exemplified
  • the iron base member low alloy chilled cast iron, carburized steel or tempered carbon steel, and The cam lobe using the material which concerns on these arbitrary combinations is mentioned.
  • Example 1 to 6 and Comparative Examples 1 to 5 A lubricating oil composition having the composition shown in Table 1 was prepared, and the friction characteristic test shown below was conducted to obtain the friction coefficient. The results are shown in Table 2.
  • SCM420 cylinder ⁇ 15 mm ⁇ 22 mm
  • Lubricating base oil hydrocracked mineral oil (100 ° C. kinematic viscosity 4.47 mm 2 / s)
  • Ca phenate Ca phenate (Ca content: 9.25% by mass)
  • DLC DLC containing 20% hydrogen
  • DLC W 20% hydrogen (tungsten added)
  • Comparative Examples 1 and 2 have a high coefficient of friction because Ca phenate and boron-containing succinimide are blended as a metallic detergent and an ashless dispersant, respectively. Since the comparative example 3 does not contain a sulfur compound, the friction coefficient is high. In Comparative Examples 4 and 5, the amount of phosphorus or calcium is excessive, and thus the friction coefficient is high.
  • the lubricating oil composition of the present invention is applied to a sliding surface made of a low-friction sliding material such as a DLC material and can impart excellent low-friction characteristics, particularly when applied to an internal combustion engine. A fuel efficiency effect can be imparted.

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  • General Chemical & Material Sciences (AREA)
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  • Organic Chemistry (AREA)
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  • Lubricants (AREA)

Abstract

La composition lubrifiante ci-décrite présente un bas coefficient de frottement quand elle est utilisée à titre de lubrifiant pour un matériau de glissement à bas frottement, même si ladite composition lubrifiante contient du ZnDTP à titre d'agent anti-usure. Plus particulièrement, une composition lubrifiante spécifique qui est obtenue par mélange de (A) un agent de nettoyage spécifique qui contient un métal alcalino-terreux, (B) un dispersant sans cendres spécifique à base de succinimide qui ne contient pas de bore, (C) un dialkyldithiophosphate de zinc et (D) un composé soufré spécifique dans une huile de base lubrifiante, est décrite. La composition lubrifiante spécifique selon l'invention est utilisée pour un matériau de glissement à bas frottement.
PCT/JP2010/065136 2009-09-15 2010-09-03 Composition lubrifiante WO2011033953A1 (fr)

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CN104169403A (zh) * 2012-03-16 2014-11-26 出光兴产株式会社 润滑油组合物、使用该润滑油组合物的滑动机构

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US9410106B2 (en) 2012-03-12 2016-08-09 Idemitsu Kosan Co., Ltd. Lubricating oil composition
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 (fr) * 2015-08-26 2023-07-04 Infineum International Limited Compositions d'huile lubrifiante
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
US20220106538A1 (en) * 2019-02-22 2022-04-07 Eneos Corporation Refrigerator oil and refrigerator working fluid composition
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CN102597194B (zh) 2014-12-31
EP2479248A4 (fr) 2013-05-15
EP2479248A1 (fr) 2012-07-25
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