EP2772525A1 - Schmierölzusammensetzung - Google Patents

Schmierölzusammensetzung Download PDF

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Publication number
EP2772525A1
EP2772525A1 EP20120843194 EP12843194A EP2772525A1 EP 2772525 A1 EP2772525 A1 EP 2772525A1 EP 20120843194 EP20120843194 EP 20120843194 EP 12843194 A EP12843194 A EP 12843194A EP 2772525 A1 EP2772525 A1 EP 2772525A1
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EP
European Patent Office
Prior art keywords
lubricating oil
oil composition
viscosity
kinematic viscosity
measured
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Withdrawn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
EP20120843194
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English (en)
French (fr)
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EP2772525A4 (de
Inventor
Yoshitaka Tamoto
Toshyuki TSUBOUCHI
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 EP2772525A1 publication Critical patent/EP2772525A1/de
Publication of EP2772525A4 publication Critical patent/EP2772525A4/de
Withdrawn legal-status Critical Current

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    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32Esters
    • C10M105/40Esters containing free hydroxy or carboxyl groups
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    • C10M105/00Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/18Ethers, e.g. epoxides
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    • C10M105/00Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32Esters
    • C10M105/36Esters of polycarboxylic acids
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    • C10M107/00Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/20Lubricating compositions characterised by the base-material being a macromolecular compound containing oxygen
    • C10M107/30Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M107/32Condensation polymers of aldehydes or ketones; Polyesters; Polyethers
    • C10M107/34Polyoxyalkylenes
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    • C10M2203/00Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
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    • C10M2203/00Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/1006Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
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    • C10M2205/00Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/022Ethene
    • C10M2205/0225Ethene used as base material
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    • C10M2205/028Organic 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
    • C10M2205/0285Organic 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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    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/04Ethers; Acetals; Ortho-esters; Ortho-carbonates
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    • C10M2207/046Hydroxy ethers
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    • C10M2207/28Esters
    • C10M2207/281Esters of (cyclo)aliphatic monocarboxylic acids
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    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28Esters
    • C10M2207/282Esters of (cyclo)aliphatic oolycarboxylic acids
    • C10M2207/2825Esters of (cyclo)aliphatic oolycarboxylic acids used as base material
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    • C10M2209/00Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/107Polyethers, i.e. containing di- or higher polyoxyalkylene groups of two or more specified different alkylene oxides covered by groups C10M2209/104 - C10M2209/106
    • C10M2209/1075Polyethers, i.e. containing di- or higher polyoxyalkylene groups of two or more specified different alkylene oxides covered by groups C10M2209/104 - C10M2209/106 used as base material
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    • C10M2209/10Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/108Polyethers, i.e. containing di- or higher polyoxyalkylene groups etherified
    • C10M2209/1085Polyethers, i.e. containing di- or higher polyoxyalkylene groups etherified used as base material
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    • C10M2209/10Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/109Polyethers, i.e. containing di- or higher polyoxyalkylene groups esterified
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    • C10M2215/28Amides; Imides
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    • C10M2219/00Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/044Sulfonic acids, Derivatives thereof, e.g. neutral salts
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    • C10M2223/00Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04Phosphate esters
    • C10M2223/045Metal containing thio derivatives
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    • C10N2010/00Metal present as such or in compounds
    • C10N2010/04Groups 2 or 12
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    • C10N2020/00Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01Physico-chemical properties
    • C10N2020/02Viscosity; Viscosity index
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    • C10N2030/00Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
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Definitions

  • the present invention relates to a lubricating oil composition, and more particularly, to a lubricating oil composition having a high viscosity index and a low coefficient of fluid friction in an elastohydrodynamic lubrication which is excellent in saving of energy and reduction in fuel consumption.
  • Lubricating oils have been inherently used for the purpose of reducing friction at sliding portions by forming an oil film on the sliding portions. Therefore, in order to form a strong oil film, it is advantageous that the lubricating oils have a high viscosity.
  • the lubricating oils having a high viscosity require a considerable amount of power upon stirring or supply thereof and therefore suffer from a large energy loss, thereby failing to achieve saving of energy and improvement in fuel consumption. In consequence, in recent years, reduction in viscosity of the lubricating oils has proceeded to prevent occurrence of a power loss.
  • Patent Document 1 discloses the method of reducing a coefficient of traction (i.e., tractive coefficient) of a lubricating oil composition containing a base stock having a viscosity larger than 3cSt as measured at 100°C by adding a traction reducer to the composition.
  • a coefficient of traction i.e., tractive coefficient
  • the traction reducer there is described a monobasic acid ester or the like (refer to claims 1 and 4 of Patent Document 1).
  • a lubricating oil composition having an increased viscosity index and a reduced coefficient of traction.
  • Patent Document 1 JP 2008-530268A
  • An object of the present invention is to provide a lubricating oil composition having an extremely high viscosity index and a low coefficient of traction as a coefficient of fluid friction in an elastohydrodynamic lubrication which is excellent in saving of energy and reduction in fuel consumption.
  • the present inventors have found that when compounding a specific low-viscosity synthetic oil containing ether bond(s) with a specific high-viscosity synthetic oil, the above object can be effectively achieved.
  • the present invention has been accomplished on the basis of the above finding.
  • the present invention relates to the following aspects.
  • a lubricating oil composition having an extremely high viscosity index and a low coefficient of traction as a coefficient of fluid friction in an elastohydrodynamic lubrication which is excellent in saving of energy and reduction in fuel consumption. Therefore, it is also possible to provide a lubricating oil composition capable of reducing a power loss in mechanical devices including rolling bearings or gears which is excellent in saving of energy and reduction in fuel consumption.
  • the lubricating oil composition according to present invention includes (A) a low-viscosity synthetic oil and (B) a high-viscosity synthetic oil.
  • the low-viscosity synthetic oil used as the component A in the present invention is required to be in the form of a compound containing ether bond(s) in a molecule thereof.
  • the compound may contain at least one ether bond in a molecule thereof, and may also contain two or more ether bonds in a molecule thereof.
  • the number of ether bonds contained in a molecule of the compound is preferably from 1 to 6, more preferably from 1 to 4 and still more preferably from 3 to 4.
  • the compound containing ether bond(s) in a molecule thereof as used in the present invention is not particularly limited as long as it contains the ether bond, and may also contain the other bond(s) such as, for example, ester bond(s).
  • the low-viscosity synthetic oil as the component A is in the form of a compound having a kinematic viscosity of less than 10 mm 2 /s as measured at 40°C.
  • the reason therefor is as follows. That is, since the component A is used in combination with the high-viscosity synthetic oil (as the component B) in the lubricating oil composition, it is required to reduce a kinematic viscosity of the composition and achieve saving of energy and reduction in fuel consumption.
  • the kinematic viscosity of the component A as measured at 40°C is preferably not more than 9 mm 2 /s, more preferably not more than 8 mm 2 /s and still more preferably not more than 5 mm 2 /s.
  • the lower limit of the kinematic viscosity of the component A as measured at 40°C is not particularly limited, and is preferably not less than 1 mm 2 /s and more preferably not less than 1.5 mm 2 /s from the viewpoint of preventing occurrence of evaporation loss of the lubricating oil composition.
  • the compound containing ether bond(s) in a molecule thereof as the component A is further required to be a low-viscosity synthetic oil in which a ratio of the number of oxygen atoms to the number of carbon atoms as constituents of the compound (O/C ratio) and the kinematic viscosity (mm 2 /s) of the compound as measured at 40°C satisfy the following formula (1): Kinematic Viscosity at 40 ⁇ °C ⁇ 12 - O / C ratio x 30
  • the compound containing ether bond(s) in a molecule thereof which has the O/C ratio controlled so as to satisfy the above formula (1) has a good solubility and can exhibit a low viscosity and a well-controlled viscosity index. Meanwhile, in order to further enhance the above effects, the upper limit of the right-side value of the above formula (1) is preferably adjusted to 8.5.
  • the component A used in the present invention may be any compound as long as it satisfies the above requirement, and is preferably is at least one compound selected from the group consisting of the following compounds (a-1) to (a-3) from the viewpoint of a good availability:
  • the number of carbon atoms in the alkyl ether, the alkyl ester, the alkoxyalkyl ester and the fatty acid, concerning the above compounds (a-1) to (a-3) may be determined such that the condition of the kinematic viscosity of the respective compounds as measured at 40°C and the above formula (1) are satisfied.
  • alkyl ether examples include ethyl ether, propyl ether, butyl ether, hexyl ether and hexyl butyl ether.
  • the ether group of these alkyl ethers may be in the form of a monoether, a diether, a triether or the like.
  • preferred is dibutyl ether.
  • alkyl ester examples include a decanoic acid alkyl ester, an octanoic acid alkyl ester and a nonanoic acid alkyl ester.
  • alkyl esters preferred is an octanoic acid alkyl ester.
  • alkoxyalkyl ester of a saturated or unsaturated fatty acid examples include a palmitoleic acid butoxyethyl ester, an oleic acid butoxyethyl ester and an elaidic acid butoxyethyl ester.
  • alkoxyalkyl esters of a saturated or unsaturated fatty acid preferred is an oleic acid butoxyethyl ester.
  • the content of the component A is preferably from 20 to 90% by mass, more preferably from 30 to 80% by mass and still more preferably from 50 to 80% by mass on the basis of a total amount of the component A and the below-mentioned component B.
  • the content of the component A is 20% by mass or more, it is possible to attain the effect of reducing a coefficient of traction of the lubricating oil composition, and at the same time, reduce a viscosity of the composition.
  • the content of the component A is 90% by mass or less, it is possible to obtain a lubricating oil composition having a good solubility and a high stability.
  • the lower limit of the kinematic viscosity of the low-viscosity synthetic oil (component A) as measured at 100°C is preferably 0.5 mm 2 /s or more, and more preferably 0.7 mm 2 /s or more, whereas the upper limit of the kinematic viscosity of the low-viscosity synthetic oil (component A) as measured at 100°C is preferably 3.0 mm 2 /s or less, more preferably 2.0 mm 2 /s or less and still more preferably 1.5 mm 2 /s or less.
  • component B there is used a hydrocarbon-based synthetic oil having a kinematic viscosity of 40 mm 2 /s or more as measured at 100°C.
  • the kinematic viscosity of the component B as measured at 100°C is less than 40 mm 2 /s, it is not necessarily possible to obtain a lubricating oil composition having a sufficiently high viscosity index. Therefore, the kinematic viscosity of the component B as measured at 100°C is preferably 50 mm 2 /s or more, more preferably 80 mm 2 /s or more and still more preferably 100 mm 2 /s or more.
  • the upper limit of the kinematic viscosity of the component B as measured at 100°C is not particularly limited, but is preferably 150 mm 2 /s or less and more preferably 130 mm 2 /s or less in view of preventing deterioration in shear stability of the lubricating oil composition.
  • the kinematic viscosity of the component B as measured at 100°C is preferably from 100 to 150 mm 2 /s and more preferably from 100 to 130 mm 2 /s.
  • hydrocarbon-based high-viscosity synthetic oil there may be used at least one compound selected from the group consisting of an ⁇ -olefin oligomer, a hydrogenated ⁇ -olefin oligomer and an ethylene-propylene co-oligomer.
  • these compounds from the viewpoint of suppressing increase in viscosity of the composition at a low temperature, preferred are the ⁇ -olefin oligomer and/or the hydrogenated ⁇ -olefin oligomer.
  • the raw material of the ⁇ -olefin oligomer or the hydrogenated ⁇ -olefin oligomer may have any ⁇ -olefin having a straight chain structure or a branched chain structure.
  • ⁇ -olefins having 8 to 12 carbon atoms which are selected from the group consisting of 1-octene, 1-nonene, 1 decene, 1-undecene and 1-dodecene may be used singly or in combination of any two or more thereof.
  • ⁇ -olefin oligomer and/or the hydrogenated ⁇ -olefin oligomer which are produced by using 1-decene as the raw material.
  • the polymerization for producing the above ⁇ -olefins may be carried out by using various polymerization (oligomerization) catalysts.
  • the polymerization catalysts include metallocene catalysts and so-called non-metallocene catalysts such as boron trifluoride (BFs) and Ziegler catalysts.
  • the ⁇ -olefin oligomers produced using the metallocene catalysts and the hydrogenated ⁇ -olefin oligomers produced by further hydrogenating the ⁇ -olefin oligomers are preferred from the viewpoint of a high viscosity index thereof.
  • a complex having a conjugated carbon 5-membered ring containing an element belonging to Group 4 of the Periodic Table i.e., a metallocene complex
  • a metallocene complex may be used in combination with an oxygen-containing organoaluminum compound.
  • Examples of the element belonging to Group 4 of the Periodic Table contained in the metallocene complex include titanium, zirconium and hafnium. Among these elements, preferred is zirconium.
  • the complex having a conjugated carbon 5-membered ring may be used in the form of a complex having a substituted or unsubstituted cyclopentadienyl ligand.
  • metallocene complex examples include bis(n-octadecyl cyclopentadienyl) zirconium dichloride, bis(trimethylsilyl cyclopentadienyl) zirconium dichloride, bis(tetrahydroindenyl) zirconium dichloride, bis[(t-butyldimethylsilyl) cyclopentadienyl] zirconium dichloride, bis(di-t-butyl cyclopentadienyl) zirconium dichloride, (ethylidene-bisindenyl) zirconium dichloride, biscyclopentadienyl zirconium dichloride, ethylidnebis(tetrahydroindenyl) zirconium dichloride and bis[3,3(2-methyl-benzindenyl)] dimethylsilane-diyl zirconium dichloride.
  • These metallocene complexes may be
  • oxygen-containing organoaluminum compound examples include methyl alumoxane, ethyl alumoxane and isobutyl alumoxane. These oxygen-containing organoaluminum compounds may be used alone or in combination of any two or more thereof.
  • the ethylene-propylene co-oligomer used as the component B is not particularly limited, and may be used in the form of an ethylene-propylene copolymer having an ethylene content of usually from 10 to 90 mol% and preferably from 20 to 80 mol%. Such a co-oligomer can exhibit a high viscosity index and a good shear stability.
  • the content of the component B in the lubricating oil composition is preferably from 80 to 10% by mass, more preferably 70 to 20% by mass and still more preferably from 50 to 20% by mass on the basis of a total amount of the components A and B.
  • the content of the component B in the lubricating oil composition is 10% by mass or more, it is possible to obtain a lubricating oil having a high viscosity index.
  • the content of the component B in the lubricating oil composition is 80% by mass or less, it is possible to obtain a stable composition having a good solubility.
  • the total content of the components A and B in the lubricating oil composition is preferably 70% by mass or more, more preferably 80% by mass or more, and still more preferably 90% by mass or more.
  • the lubricating oil composition containing the components A and B according to the present invention may be further compounded with a lubricating oil additive as a component C.
  • lubricating oil additive as the component C, there may be mentioned (c-1) an antioxidant, (c-2) an extreme pressure agent or an anti-wear agent, (c-3) a dispersant and (c-4) a metal-based detergent, etc.
  • c-1 an antioxidant
  • c-2 an extreme pressure agent or an anti-wear agent
  • c-3 a dispersant
  • c-4 a metal-based detergent
  • antioxidants examples include an amine-based antioxidant, a phenol-based antioxidant and a sulfur-based antioxidant.
  • amine-based antioxidant examples include dialkyl (number of carbon atoms in the alkyl group: from 1 to 20) diphenyl amines such as 4,4'-dibutyl diphenyl amine, 4,4'-dioctyl diphenyl amine and 4,4'-dinonyl diphenyl amine; and naphthyl amines such as phenyl- ⁇ -naphthyl amine, octyl phenyl- ⁇ -naphthyl amine and nonyl phenyl- ⁇ -naphthyl amine.
  • diphenyl amines such as 4,4'-dibutyl diphenyl amine, 4,4'-dioctyl diphenyl amine and 4,4'-dinonyl diphenyl amine
  • naphthyl amines such as phenyl- ⁇ -naphthyl amine, octyl
  • phenol-based antioxidant examples include monophenol-based antioxidants such as 2,6-di-tert-butyl-4-methyl phenol and 2,6-di-tert-butyl-4-ethyl phenol; and diphenol-based antioxidants such as 4,4'-methylenebis(2,6-di-tert-butyl phenol) and 2,2'-methylenebis(4-ethyl-6-tert-butyl phenol).
  • sulfur-based antioxidant examples include phenothiazine, pentaerythritol-tetrakis-(3-lauryl thiopropionate), bis(3,5-tert-butyl-4-hydroxybenzyl) sulfide, thiodiethylenebis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)) propionate and 2,6-di-tert-butyl-4-(4,6-bis(octylthio)-1,3,5-triazine-2-methylamino) phenol.
  • antioxidants may be used alone or in combination of any two or ore thereof.
  • the amount of the antioxidant compounded in the lubricating oil composition is usually from 0.01 to 10% by mass and preferably from 0.03 to 5% by mass on the basis of a whole amount of the lubricating oil composition.
  • Examples of the extreme pressure agent or anti-wear agent as the component (c-2) include a sulfur-based extreme pressure agent, a phosphorus-based anti-wear agent, an S-P-based extreme pressure agent, zinc hydrocarbyl dithiophosphate and a thiazole-based extreme pressure agent.
  • sulfur-based extreme pressure agent examples include sulfurized oils and fats, sulfurized fatty acids, sulfurized esters, sulfurized olefins, dihydrocarbyl polysulfides, thiadiazole compounds, alkyl thiocarbamoyl compounds, thiocarbamate compounds, thioterpene compounds and dialkyl thiodipropionate compounds.
  • phosphorus-based anti-wear agent examples include phosphoric acid ester compounds such as phosphoric acid esters, acidic phosphoric acid esters, phosphorous acid esters and acidic phosphorous acid esters, and amine salts of these phosphoric acid ester compounds.
  • the S-P-based extreme pressure agent may be in the form of either a compound containing sulfur and phosphorus in a molecule thereof such as triphenyl thiophosphate and lauryl trithiophosphate, or a mixture of the sulfur-based extreme pressure agent and the phosphorus-based extreme pressure agent.
  • the respective extreme pressure agents may be selected from the sulfur-based extreme pressure agents and the phosphorus-based extreme pressure agents as exemplified above.
  • the hydrocarbyl group of the zinc dihydrocarbyl dithiophosphate may be any of a linear or branched alkyl group having 1 to 24 carbon atoms, a linear or branched alkenyl group having 3 to 24 carbon atoms, a cycloalkyl group or linear or branched alkyl cycloalkyl group having 5 to 13 carbon atoms, an aryl group or linear or branched alkyl aryl group having 6 to 18 carbon atoms, and an arylalkyl group having 7 to 19 carbon atoms, etc.
  • the alkyl group or the alkenyl group as the hydrocarbyl group may be in the form of either a primary group, a secondary group or a tertiary group.
  • thiadiazole compounds include 2,5-bis(n-hexyldithio)-1,3,4-thiadiazole, 2,5-bis(n-octyldithio)-1,3,4-thiadiazole, 2,5-bis(n-nonyldithio)-1,3,4-thiadiazole, 2,5-bis(1,1,3,3-tetramethylbutyldithio)-1,3,4-thiadiazole, 3,5-bis(n-hexyldithio)-1,2,4-thiadiazole, 3,6-bis(n-octyldithio)-1,2,4-thiadiazole, 3,5-bis(n-nonyldithio)-1,2,4-thiadiazole, 3,5-bis(1,1,3,3-tetramethylbutyldithio)-1,2,4-thiadiazole, 4,5-bis(n-octyldithio)-1,2,3-thiadiazole,
  • extreme pressure agents or anti-wear agents may be used alone or in combination of any two or more thereof.
  • the amount of the extreme pressure agent or anti-wear agent compounded in the lubricating oil composition is usually in the range of from 0.01 to 10% by mass and preferably from 0.05 to 5% by mass on the basis of a whole amount of the lubricating oil composition.
  • Examples of the dispersant as the component (c-3) include an imide-based dispersant, an amide-based dispersant and an ester-based dispersant.
  • dispersant examples include an alkenyl group-substituted alkenyl succinic acid imide having an average molecular weight of from 1000 to 3500 or a boronated product thereof, benzyl amine, alkyl polyamines and alkenyl succinic acid esters.
  • the amount of the dispersant compounded in the lubricating oil composition is usually in the range of from 0.05 to 10% by mass and preferably from 0.1 to 5% by mass on the basis of a whole amount of the lubricating oil composition.
  • Examples of the metal-based detergent as the component (c-4) include sulfonates of alkali earth metals such as Ca, Mg and Ba, phenates of alkali earth metals, salicylates of alkali earth metals and phosphonates of alkali earth metals. These metal-based detergents may be either neutral, basic or perbasic.
  • metal-based detergents may be used alone or in combination of any two or more thereof.
  • the amount of the metal-based detergent compounded in the lubricating oil composition is usually in the range of from 0.05 to 30% by mass and preferably from 0.1 to 10% by mass on the basis of a whole amount of the lubricating oil composition.
  • the lubricating oil additives in addition to the above components, there may be appropriately compounded the other additives such as an oiliness agent, a rust-preventive agent, a metal deactivator, an anti-corrosion agent, a pour point depressant and a defoamer.
  • the other additives such as an oiliness agent, a rust-preventive agent, a metal deactivator, an anti-corrosion agent, a pour point depressant and a defoamer.
  • the total amount of the lubricating oil additives compounded in the lubricating oil composition of the present invention is usually from 1 to 20 parts by mass and preferably from 3 to 15 parts by mass on the basis of 100 parts by mass of a sum of the components A and B.
  • the lubricating oil composition of the present invention may be further compounded with a lubricant base oil in addition to the above components unless the object of the present invention is adversely affected by addition of the lubricant base oil.
  • the lubricant base oil examples include mineral oils having a kinematic viscosity of 10 mm 2 /s or less as measured at 100°C, and synthetic oils such as ⁇ -olefin oligomers, polybutene and polyol esters.
  • the base oil is preferably compounded in an amount of 30% by mass or less on the basis of the lubricating oil composition.
  • the lubricating oil composition of the present invention contains the components A and B, and further may contain the component C, if required.
  • the viscosity index of the lubricating oil composition of the present invention is preferably 220 or more, more preferably 240 or more, and still more preferably 260 or more. When the viscosity index of the lubricating oil composition is 220 or more, the resulting composition can readily form an oil film on sliding portions at a high temperature while achieving saving of energy and reduction in fuel consumption.
  • the coefficient of traction of the lubricating oil composition of the present invention is preferably 0.025 or less and more preferably 0.020 or less.
  • the coefficient of traction of the lubricating oil composition is 0.025 or less, the resulting composition can exhibit a sufficient effect of reducing a coefficient of fluid friction in an elastohydrodynamic lubrication.
  • the coefficient of traction is the value as measured by the below-mentioned evaluation method.
  • the kinematic viscosity of the lubricating oil composition of the present invention is not particularly limited and may be appropriately determined according to the aimed applications or conditions upon use of the lubricating oil composition.
  • the kinematic viscosity of the lubricating oil composition as measured at 40°C is preferably 25 mm 2 /g or less, and the kinematic viscosity of the lubricating oil composition as measured at 100°C is preferably 6 mm 2 /g or more.
  • the lubricating oil composition of the present invention is capable of reducing a power loss in mechanical devices including rolling bearings or gears as mechanical elements, can provide a lubricating oil that is excellent in saving of energy and reduction in fuel consumption, and can be suitably used as industrial bearing oils, industrial gear oils, gear oils for vehicles, transmission fluids for vehicles, etc.
  • the lubricating oil compositions having the formulations shown in Table 2 were prepared using the base materials shown in Table 1, and the viscosity index, kinematic viscosity, solubility and coefficient of traction of the obtained lubricating oil compositions were measured.
  • the lubricating oil compositions were prepared by the method in which the respective base materials used for preparing the compositions were stirred and mixed at 60°C for 30 min.
  • the properties and performance of the lubricating oil compositions were measured by the following methods.
  • the lubricating oil composition prepared by the above method was allowed to stand at room temperature for 8 h, and then an appearance of the lubricating oil composition was observed by naked eyes to examine whether or not any insoluble components were precipitated.
  • the coefficient of traction of the lubricating oil composition was measured using the following testing machine under the following conditions.
  • the lubricating oil compositions containing the low-viscosity synthetic oils and the high-viscosity synthetic oils according to the present invention had an extremely high viscosity index of 220 or more and an extremely small coefficient of traction of 0.024 or less, exhibited a good solubility and therefore were in the form of a stable composition (Examples 1 to 12).
  • the present invention it is possible to provide a lubricating oil composition having not only an extremely high viscosity index but also a low coefficient of traction as a low coefficient of fluid friction in an elastohydrodynamic lubrication which is excellent in saving of energy and reduction in fuel consumption. Therefore, the lubricating oil composition of the present invention is excellent in saving of energy and reduction in fuel consumption since the composition is capable of reducing a power loss, in particular, in mechanical devices including rolling bearings or gears, and can be suitably used in the form of various lubricating oil compositions as industrial bearing oils, industrial gear oils, gear oils for vehicles, transmission fluids for vehicles, etc.

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EP2873721A4 (de) * 2012-07-13 2016-05-11 Idemitsu Kosan Co Schmierölzusammensetzung und getriebeöl für ein fahrzeug damit

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JP6204241B2 (ja) * 2014-03-27 2017-09-27 出光興産株式会社 駆動系用潤滑油基油及び駆動系用潤滑油組成物
JP6259728B2 (ja) * 2014-06-30 2018-01-10 出光興産株式会社 潤滑油組成物
JP5941972B2 (ja) * 2014-12-12 2016-06-29 出光興産株式会社 潤滑油組成物
US9879198B2 (en) * 2015-11-25 2018-01-30 Santolubes Llc Low shear strength lubricating fluids
WO2018109126A1 (en) * 2016-12-16 2018-06-21 Castrol Limited Ether-based lubricant compositions, methods and uses
US11492566B2 (en) * 2016-12-16 2022-11-08 Castrol Limited Ether-based lubricant compositions, methods and uses
CN110462010B (zh) * 2016-12-16 2023-01-10 卡斯特罗尔有限公司 基于醚的润滑剂组合物、方法和用途
EP3555249A1 (de) * 2016-12-16 2019-10-23 Castrol Limited Etherbasierte schmiermittelzusammensetzungen, verfahren und verwendungen
CN112280611B (zh) * 2020-11-02 2023-03-14 江苏创斯达科技有限公司 一种零间隙无级变速器用牵引油

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JP5033419B2 (ja) * 2003-09-13 2012-09-26 エクソンモービル・ケミカル・パテンツ・インク 自動車用ギアのための潤滑組成物
US7732389B2 (en) 2005-02-04 2010-06-08 Exxonmobil Chemical Patents Inc. Lubricating fluids with low traction characteristics
JP5122740B2 (ja) * 2005-11-15 2013-01-16 出光興産株式会社 冷凍機油組成物
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EP2873721A4 (de) * 2012-07-13 2016-05-11 Idemitsu Kosan Co Schmierölzusammensetzung und getriebeöl für ein fahrzeug damit
US9624453B2 (en) 2012-07-13 2017-04-18 Idemitsu Kosan Co., Ltd. Lubricating oil composition and automotive transmission oil using same

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