EP2518135B2 - Systemschmierölzusammensetzung für dieselmotor in kreuzkopfbauart - Google Patents

Systemschmierölzusammensetzung für dieselmotor in kreuzkopfbauart Download PDF

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Publication number
EP2518135B2
EP2518135B2 EP10839048.5A EP10839048A EP2518135B2 EP 2518135 B2 EP2518135 B2 EP 2518135B2 EP 10839048 A EP10839048 A EP 10839048A EP 2518135 B2 EP2518135 B2 EP 2518135B2
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EP
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Prior art keywords
lubricating oil
crosshead
oil composition
diesel engine
composition
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EP10839048.5A
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English (en)
French (fr)
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EP2518135A4 (de
EP2518135A1 (de
EP2518135B1 (de
Inventor
Shigeki Takeshima
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Eneos Corp
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JX Nippon Oil and Energy Corp
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Priority claimed from JP2009292337A external-priority patent/JP5483330B2/ja
Priority claimed from JP2009292336A external-priority patent/JP5414513B2/ja
Application filed by JX Nippon Oil and Energy Corp filed Critical JX Nippon Oil and Energy Corp
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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
    • C10M143/00—Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation
    • C10M143/08—Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation containing aliphatic monomer having more than 4 carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M143/00—Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation
    • C10M143/02—Polyethene
    • 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
    • C10M143/00—Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation
    • C10M143/10—Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation containing aromatic monomer, e.g. styrene
    • 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
    • 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
    • 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
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/102—Aliphatic fractions
    • C10M2203/1025—Aliphatic fractions used as base material
    • 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
    • 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
    • C10M2203/108—Residual fractions, e.g. bright stocks
    • C10M2203/1085—Residual fractions, e.g. bright stocks used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/022—Ethene
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/026—Butene
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/04—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing aromatic monomers, e.g. styrene
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/028—Overbased salts thereof
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/26—Overbased carboxylic acid salts
    • C10M2207/262—Overbased carboxylic acid salts derived from hydroxy substituted aromatic acids, e.g. salicylates
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
    • C10M2209/084—Acrylate; Methacrylate
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/28—Amides; Imides
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04—Phosphate esters
    • C10M2223/045—Metal containing thio derivatives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/02—Viscosity; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/073—Star shaped polymers
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/02—Pour-point; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/08—Resistance to extreme temperature
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/52—Base number [TBN]
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/54—Fuel economy
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/25—Internal-combustion engines
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/25—Internal-combustion engines
    • C10N2040/252—Diesel engines
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/25—Internal-combustion engines
    • C10N2040/255—Gasoline engines

Definitions

  • the present invention relates to a system lubricating oil composition for a crosshead-type diesel engine.
  • a cylinder oil for lubricating the friction point between the cylinders and pistons and a system oil for lubricating and cooling other portions have been used.
  • the cylinder oil is required to have a suitable viscosity needed to lubricate a friction portion between a cylinder and a piston (piston ring) and a function to maintain detergency needed to allow a piston and a piston ring to move appropriately.
  • a high-sulfur content fuel is generally used for the economy reason, it has a problem that acidic components such as sulfuric acid generated by the combustion of the fuel corrode a cylinder.
  • the cylinder oil is required to have a function to neutralize the acidic components such as sulfuric acid so as to prevent corrosion.
  • the system oil does not contact combustion gas unlike the usual diesel engine oil and is a lubricating oil which is stored in a tank and supplied to bearings with a circulation pump for lubrication and cooling and is thus required to maintain a suitable viscosity for a long period of time because it is used for a long time unlike the cylinder oil (see, for example, Patent Literature 1 below).
  • a crosshead-type engine for ships has a problem that the system oil is eventually increased in viscosity by being mixed with a drip oil, and how such viscosity increase should be suppressed has become a longstanding problem.
  • Patent Literature 2 describes a method of lubricating a two-stoke, diesel crosshead engine, comprising lubricating the engine with a cylinder oil and with a system oil, in which the system oil comprises (a) a base oil, (b) a detergent additive, and (c) an anti-wear additive.
  • Patent Literature 3 describes a lubricating oil composition containing a base oil of lubricating viscosity, overbased sulfurized alkyl-phenate detergent, an overbased alkylsulfonate detergent, an ashless dispersant, and a zinc dialkyldithiophosphate and/or zinc diaryldithiophosphate.
  • the present invention has an object to provide a system lubricating oil composition for a crosshead-type diesel engine, which can prevent fuel efficiency deterioration by suppressing the viscosity increase.
  • a lubricating oil composition containing a specific polymer can balance a viscosity increase caused by being mixed with a drip oil and a viscosity decrease due to thermal decomposition of a polymer and thus is an advantageously effective system lubricating oil composition for a crosshead-type diesel engine.
  • a system oil comprising a lubricating base oil blended with a star polymer having a vinyl aromatic hydrocarbon structure in the molecule and/or an olefin copolymer, which have characteristics that are excellent in shear stability but likely to decompose with heat makes it possible to decrease the viscosity of the system oil by the decomposition of the polymer at piston surfaces to be cooled and thus balance out the viscosity increase caused by being mixed with a cylinder drip oil thereby suppressing fuel efficiency deterioration.
  • the present invention relates to the use of a system lubricating oil composition in a crosshead-type diesel engine, the system lubricating oil composition comprising a mineral base oil and/or a synthetic base oil, and (A) (a-1) a star polymer having a vinyl aromatic hydrocarbon structure in the molecule and/or (a-2) an ethylene- ⁇ -olefin copolymer or a hydrogenated compound thereof, and having a base number of 4 to 20 mgKOH/g and a 100°C kinematic viscosity of 7.5 to 15.0 mm 2 /s; wherein Component (A) is contained in an amount of 2 to 15 percent by mass on the basis of the total mass of the composition.
  • the present invention further relates to a system lubricating oil composition for a crosshead-type diesel engine comprising a mineral base oil and/or a synthetic base oil, and (A) (a-1) a star polymer having a vinyl aromatic hydrocarbon structure in the molecule and/or (a-2) an ethylene- ⁇ -olefin copolymer or a hydrogenated compound thereof, and having a base number of 4 to 20 mgKOH/g and a 100°C kinematic viscosity of 7.5 to 12.5 mm 2 /s; wherein Component (A) is contained in an amount of 2 to 15 percent by mass on the basis of the total mass of the composition.
  • the present invention also relates to the foregoing system lubricating oil composition for a crosshead-type diesel engine wherein Component (a-1) is a compound having a structure wherein the polymer or copolymer of a diene extends radially from the core of the vinyl aromatic hydrocarbon located in the center of the molecule.
  • the present invention also relates to the foregoing system lubricating oil composition for a crosshead-type diesel engine wherein the vinyl aromatic hydrocarbon is divinylbenzene.
  • the present invention also relates to the foregoing system lubricating oil composition for a crosshead-type diesel engine wherein the polymer or copolymer of a diene is polyisoprene or an isoprene-styrene copolymer.
  • the present invention also relates to the foregoing system lubricating oil composition for a crosshead-type diesel engine further comprising at least one type selected from the group consisting of (B) metal detergents, (C) zinc dialkyldithiophosphates, (D) rust inhibitors and (E) ashless dispersants.
  • the present invention also relates to the foregoing system lubricating oil composition for a crosshead-type diesel engine wherein the base oil has a 100°C kinematic viscosity of 3.5 to 9.3 mm 2 /s.
  • system lubricating oil composition for a crosshead-type diesel engine of the present invention makes it possible to suppress the viscosity from increasing, resulting in inhibition of fuel efficiency deterioration.
  • the lubricating oil composition of the present invention may be a mineral oil, a synthetic oil, or a mixture thereof.
  • the mineral base oil examples include those which can be produced by subjecting a lubricating oil fraction produced by vacuum-distilling an atmospheric distillation bottom oil resulting from atmospheric distillation of a crude oil, to any one or more treatments selected from solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, and hydrorefining; wax-isomerized mineral oils; and those produced by isomerizing GTL WAX (Gas to Liquid Wax) produced through Fischer-Tropsch process.
  • a lubricating oil fraction produced by vacuum-distilling an atmospheric distillation bottom oil resulting from atmospheric distillation of a crude oil, to any one or more treatments selected from solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, and hydrorefining; wax-isomerized mineral oils; and those produced by isomerizing GTL WAX (Gas to Liquid Wax) produced through Fischer-Tropsch process.
  • the synthetic base oil include polybutenes and hydrogenated compounds thereof; poly- ⁇ -olefins such as 1-octene oligomer and 1-decene oligomer, and hydrogenated compounds thereof; copolymers of ethylene having a weight average molecular weight of 8,000 or less and ⁇ -olefins having 3 to 30 carbon atoms; diesters such as ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridecyl adipate and di-2-ethylhexyl sebacate; polyol esters such as trimethylolpropane caprylate, trimethylolpropane pelargonate, pentaerythritol 2-ethylhexanoate and pentaerythritol pelargonate; copolymers of dicarboxylic acids such as dibutyl maleate and ⁇ -ole
  • the lubricating base oil used in the lubricating oil composition of the present invention may be any one or more type of the mineral base oils or synthetic base oils or a mixture of one or more of the mineral base oils and one or more of the synthetic base oils.
  • the 100°C kinematic viscosity of the lubricating base oil used in the present invention is preferably 9.3 mm 2 /s or lower, more preferably 8.5 mm 2 /s or lower, more preferably 8.0 mm 2 /s or lower.
  • the 100°C kinematic viscosity is preferably 3.5 mm 2 /s or higher, more preferably 3.8 mm 2 /s or higher, more preferably 4.0 mm 2 /s or higher.
  • the 100°C kinematic viscosity referred herein denotes one defined by ASTM D-445.
  • the resulting composition could be less in viscosity decrease and thus might not exhibit the effect of suppressing the viscosity increase when mixed with a cylinder drip oil. If the 100°C kinematic viscosity is lower than 3.5 mm 2 /s, the resulting composition could be decreased in viscosity too much and thus could be deteriorated in oil film formation capability at bearings, possibly causing seizure.
  • the 40°C kinematic viscosity of the lubricating base oil used in the present invention is, however, preferably 150 mm 2 /s or lower, more preferably 120 mm 2 /s or lower, more preferably 90 mm 2 /s or lower.
  • the 40°C kinematic viscosity is preferably 15 mm 2 /s or higher, more preferably 20 mm 2 /s or higher, more preferably 25 mm 2 /s or higher.
  • the resulting composition could be less in viscosity decrease and thus might not exhibit the effect of suppressing the viscosity increase when mixed with a cylinder drip oil. If the 40°C kinematic viscosity is lower than 50 mm 2 /s, the resulting composition could be decreased in viscosity too much and thus could be deteriorated in oil film formation capability at bearings, possibly causing seizure.
  • the viscosity index of the lubricating base oil used in the present invention is preferably 85 or greater, more preferably 90 or greater, more preferably 95 or greater. No particular limitation is imposed on the upper limit of the viscosity index. Normal paraffin, slack wax or GTL wax or isoparaffinic mineral oils produced by isomerizing the foregoing may also be used.
  • the viscosity index referred herein denotes one measured in accordance with JIS K 2283-1993.
  • the lubricating oil composition of the present invention contains necessarily (a-1) a star polymer having a vinyl aromatic hydrocarbon structure in the molecule and/or (a-2) an ethylene- ⁇ -olefin copolymer or a hydrogenated compound thereof, as Component (A).
  • the star polymer having a vinyl aromatic hydrocarbon structure in the molecule that is Component (a-1) is a compound having a structure wherein the arms of polymers or copolymers of a number of (two or more) dienes extend radially from the core of the vinyl aromatic hydrocarbon located in the center of the molecule.
  • vinyl aromatic hydrocarbon located in the center of the molecule examples include divinylbenzene, trivinylbenzene, tetravinylbenzene, divinylortho-, divinylmetha- or divinylpara-xylene, trivinylortho-, trivinylmetha- or trivinylpara-xylene, tetravinylortho-, tetravinylmetha- or tetravinylpara-xylene, divinylnaphthalene, divinylethylbenzene, divinylbiphenyl, diisobutenylbenzene, diisopropenylbenzene, and diisopropenylbiphenyl.
  • divinylbenzene preferred is preferred is divinylbenzene.
  • the diene monomer constituting the polymer or copolymer of dienes has preferably 4 to 12 carbon atoms.
  • Specific examples include 1,3-butadiene, isoprene, piperylene, methylpentadiene, phenylbutadine, 3,4-dimethyl-1,3-hexadiene, and 4,5-diethyl-1,3-octadiene.
  • Preferred are 1,3-butadiene and isoprene.
  • Examples of the polymer or copolymer of dienes that will be a star polymer include homopolymers of diene such as polyisoprene and copolymers of diene such as isoprene-butadiene copolymer.
  • copolymers of diene and other monomer that is not diene for example, isoprene-styrene copolymer
  • the copolymer may be a random copolymer or a block copolymer.
  • Component (a-1) that is a star polymer having a vinyl aromatic hydrocarbon structure in the molecule used as Component (A) in the present invention has a weight average molecular weight (Mw) of preferably 10,000 or greater, more preferably 50,000 or greater, more preferably 100,000 or greater and preferably 1,000,000 or less, more preferably 800,000 or less, more preferably 500,000 or less. If the weight average molecular weight is less than 10,000, the resulting composition might not exhibit sufficiently an viscosity adjustment effect but also the production cost could be increased. If the weight average molecular weight is greater than 1,000,000, the resulting composition could be poor in shear stability and might not exhibit an viscosity adjustment effect as well.
  • Mw weight average molecular weight
  • the PSSI (permanent shear stability index) of (a-1) the star polymer having a vinyl aromatic hydrocarbon structure in the molecule used in the present invention is preferably from 1 to 40, more preferably from 1 to 35, more preferably 1 to 30, particularly preferably from 1 to 25. If the PSSI is greater than 40, the resulting composition may be poor in shear stability and thus might not exhibit sufficiently an viscosity adjustment effect. If the PSSI is less than 1, the resulting composition might not exhibit sufficiently an viscosity adjustment effect as well.
  • PSSI Permanent shear stability index of a polymer calculated on the basis of the data measured with ASTM D 6278-02 (Test Method for Shear Stability of Polymer Containing Fluids Using a European Diesel Injector Apparatus) in conformity with ASTM D 6022-01 (Standard Practice for Calculation of Permanent Shear Stability Index).
  • the ethylene- ⁇ -olefin copolymer or a hydrogenated compound thereof that is Component (a-2) is a copolymer of ethylene and an ⁇ -olefin or a compound produced by hydrogenating the copolymer.
  • Specific examples of the ⁇ -olefin include propylene, isobutylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, and 1-dodecene.
  • the ethylene- ⁇ -olefin copolymer may be one consisting of hydrocarbons that is of non-dispersant type or one produced by reacting a copolymer with a polar compound such as a nitrogen-containing compound that is a dispersant-type ethylene- ⁇ -olefin copolymer.
  • a polar compound such as a nitrogen-containing compound that is a dispersant-type ethylene- ⁇ -olefin copolymer.
  • the most preferred is an ethylene- ⁇ -propylene copolymer.
  • the ethylene- ⁇ -olefin copolymer or a hydrogenated compound thereof that is (a-2) used as Component (A) in the present invention has a weight average molecular weight (Mw) of preferably 10,000 or greater, more preferably 20,000 or greater, more preferably 50,000 and preferably 500,000 or less, more preferably 400,000 or less, more preferably 300,000. If the weight average molecular weight is less than 10,000, the resulting composition might not exhibit sufficiently an viscosity adjustment effect but also the production cost could be increased. If the weight average molecular weight is greater than 500,000, the resulting composition could be poor in shear stability and thus might not exhibit an viscosity adjustment effect as well.
  • Mw weight average molecular weight
  • the PSSI (permanent shear stability index) of (a-2) the ethylene- ⁇ -olefin copolymer or a hydrogenated compound thereof is preferably from 1 to 75, more preferably from 3 to 50, more preferably from 5 to 30, particularly preferably from 10 to 28. If the PSSI is greater than 75, Component (a-2) could be poor in shear stability and thus might not exhibit a viscosity adjustment effect when added to a system oil. If the PSSI is less than 1, the resulting composition might not exhibit a viscosity adjustment effect as well.
  • the content of Component (A) in the lubricating oil composition of the present invention is from 2 to 15 percent by mass, more preferably from 3 to 12 percent by mass, most preferably from 4 to 10 percent by mass on the basis of the total mass of the composition. If the content is less than 1 percent by mass, the resulting composition might not exhibit sufficiently a viscosity adjustment effect. If the content is more than 20 percent by mass, the resulting composition could be poor in handling properties, possibly causing adverse affects on the production of the composition and also could be deteriorated in detergency due to the generation of deposit caused by the degradation of the polymer.
  • the ethylene- ⁇ -olefin copolymer or hydrogenated compound thereof is provided in a state wherein it is diluted with 1 to 90 percent by mass of a mineral oil.
  • the lubricating oil composition of the present invention contains preferably at least one type selected from the group consisting of (B) metal detergents, (C) zinc dialkyldithiophosphates, (D) rust inhibitors and (D) ashless dispersants.
  • Component (B) that is a metal detergent may be one or more metal detergents selected from phenate detergents, sulfonate detergents, salicylate detergents, carboxylate detergents and phosphonate detergents.
  • the phenate metal detergent is a phenate metal detergent containing an alkaline earth metal salt of an alkylphenol, an alkylphenolsulfide or a Mannich reaction product of an alkylphenol represented by formulas (1) to (3) below or an (overbased) basic salt of the alkaline earth metal salt.
  • alkaline earth metal examples include magnesium, barium, and calcium. Preferred are magnesium and calcium, and particularly preferred is calcium.
  • R 1 , R 2 , R 3 , R 4 , R 5 , R 6 and R 7 may be the same or different from each other and are each independently a straight-chain or branched alkyl group having 4 to 30 carbon atoms, preferably 6 to 18 carbon atoms. If the carbon number is fewer than 4, Component (B) could be poor in dissolubility in the lubricating base oil. If the carbon number is more than 30, Component (B) could be difficult to produce and poor in heat resistance.
  • These alkyl groups may be straight-chain or branched and may be of primary, secondary, or tertiary.
  • M 1 , M 2 and M 3 are each independently an alkaline earth metal, preferably calcium and/or magnesium, x, y and z are each independently an integer of 1 to 3, m is 0, 1 or 2, and n is 0 or 1.
  • the sulfonate detergent may be an alkali metal salt or alkaline earth metal salt of an alkyl aromatic sulfonic acid produced by sulfonating an alkyl aromatic compound having a molecular weight of 300 or more, preferably 400 to 700 and/or an (overbased) basic salt of the alkali metal salt or alkaline earth metal salt.
  • alkali metal or alkaline earth metal include sodium, potassium, magnesium, barium and calcium. Preferred are magnesium and/or calcium. Particularly preferred is calcium.
  • alkyl aromatic sulfonic acid examples include petroleum sulfonic acids and synthetic sulfonic acids.
  • the petroleum sulfonic acids may be those produced by sulfonating an alkyl aromatic compound contained in the lubricant fraction of a mineral oil or may be mahogany acid by-produced upon production of white oil.
  • the synthetic sulfonic acids may be those produced by sulfonating an alkyl benzene having a straight-chain or branched alkyl group, produced as a by-product from a plant for producing an alkyl benzene used as the raw material of a detergent or produced by alkylating polyolefin to benzene, or those produced by sulfonating alkylnaphthalenes such as dinonylnaphthalene.
  • No particular limitation is imposed on the sulfonating agent used for sulfonating these alkyl aromatic compounds. In general, fuming sulfuric acids or sulfuric acid may be used.
  • the salicylate detergent may be an alkali metal or alkaline earth metal salicylate having one hydrocarbon group having 1 to 19 carbon atoms and/or an (overbased) basic salt thereof; an alkali metal or alkaline earth metal salicylate having one hydrocarbon group having 20 to 40 carbon atoms and/or an (overbased) basic salt thereof; or an alkali metal or alkaline earth metal salicylate having two or more hydrocarbon groups having 1 to 40 carbon atoms and/or an (overbased) basic salt thereof (these alkyl groups may be the same or different).
  • alkali metal or alkaline earth metal salicylates having one hydrocarbon group having 8 to 19 carbon atoms and/or (overbased) basic salts thereof because they are excellent in low-temperature flowability.
  • alkali metal or alkaline earth metal include sodium, potassium, magnesium, barium, and calcium.
  • magnesium and/or calcium Particularly preferred is calcium.
  • the base number of Component (B) that is a metal detergent used in the present invention is preferably from 50 to 500 mgKOH/g, more preferably from 100 to 450 mgKOH/g, more preferably from 150 to 350 mgKOH/g. If the base number is less than 100 mgKOH/g, corrosive wear could be increased because the resulting composition could be insufficient in acid neutralization properties. If the base number is greater than 500 mgKOH/g, a problem regarding dissolubility could arise.
  • base number denotes one measured by the perchloric acid potentiometric titration method in accordance with section 7 of JIS K2501 "Petroleum products and lubricants-Determination of neutralization number”.
  • the lower limit is, however, 1 or greater, preferably 2 or greater, particularly preferably 2.5 or greater while the upper limit is 20 or less, preferably 15 or less, more preferably 10 or less.
  • metal ratio used herein is represented by "valence of metal element x metal element content (mole%) / soap group content (mole%)" in (B) the metal detergent".
  • the metal element denotes an alkaline earth metal such as calcium and magnesium.
  • the soap group denotes phenol group.
  • the content of (B) the metal detergent if contained in the composition of the present invention is usually from 0.5 to 15 percent by mass, preferably from 1 to 12 percent by mass, particularly preferably from 1.5 to 10 percent by mass.
  • the lubricating oil composition of the present invention contains preferably (C) zinc dialkyldithiophosphates represented by formula (4):
  • R 1 , R 2 , R 3 and R 4 may be the same or different from each other and are each independently an alkyl group having 1 to 30 carbon atoms, which may be straight-chain or branched and of primary, secondary, or an alkylaryl group having 7 to 30 carbon atoms.
  • the content of (C) the zinc dithiophosphate if contained in the lubricating oil composition of the present invention is preferably from 0.005 to 0.12 percent by mass, more preferably from 0.01 to 0.10 percent by mass, more preferably from 0.02 to 0.08 percent by mass on the basis of phosphorus of the total mass of the composition. If the content is less than 0.005 percent by mass, the resulting composition could fail to obtain extreme pressure properties or gear characteristics required for a system oil. If the content is more than 0.12 percent by mass, the resulting composition could corrode bearings, seal rings in a staffing box or oil scraper rings.
  • the lubricating oil composition of the present invention contains preferably (D) rust inhibitors.
  • the rust inhibitors include sulfonic acid salts (salts of sodium, calcium or barium), succinic acid derivatives, organic acid esters such as fatty acid esters and sorbitan acid esters, carboxylic acid salts (sodium, magnesium, barium and zinc salts of stearic acid or naphthenic acid), polyhydric alcohol partial esters such as sorbitan monoester and pentaerythritol monoester, oxidized paraffin (oxidized wax), carboxylic acid, and phosphoric acid esters.
  • the content of (D) the rust inhibitor if contained in the lubricating oil composition of the present invention is preferably from 0.005 to 5 percent by mass on the basis of the total mass of the composition.
  • the lubricating oil composition of the present invention contains preferably (E) ashless dispersants.
  • the ashless dispersant may be any ashless dispersant that has been used in a lubricating oil.
  • the ashless dispersant may be succinic acid imide, benzylamine, or polyamine having in their molecules at least one straight-chain or branched alkyl or alkenyl group having 40 to 400, preferably 60 to 350 carbon atoms, or modified products thereof.
  • the alkyl or alkenyl group may be straight-chain or branched but is preferably a branched alkyl or alkenyl group derived from oligomers of olefins such as propylene, 1-butene or isobutylene or a cooligomer of ethylene and propylene.
  • succinimide or products modified with boron represented by the following formulas:
  • R 1 is an alkyl or alkenyl group having 40 to 400, preferably 60 to 350, and h is an integer of 1 to 5, preferably 2 to 4.
  • R 2 and R 3 are each independently an alkyl or alkenyl group having 40 to 400, preferably 60 to 350 carbon atoms, and particularly preferably polybutenyl group, and i is an integer of 0 to 4, preferably 1 to 3.
  • the content of the ashless dispersant if contained in the lubricating oil composition of the present invention is preferably from 1 to 8 percent by mass on the basis of the total mass of the composition.
  • any additives that have been conventionally used in a lubricating oil may be added in accordance with the purposes.
  • additives include antioxidants, extreme pressure additives, corrosion inhibitors, demulsifiers, metal deactivators, pour point depressants, and anti-foaming agents.
  • antioxidants examples include phenolic antioxidants such as DBPC, bisphenol, and hindered phenols, aminic antioxidants such as diphenylamine and N-phenyl- ⁇ -naphthylamine, and metal antioxidants such copper and molybdenum antioxidants.
  • the content of the antioxidant if contained in the lubricating oil composition is preferably from 0.05 to 5 percent by mass on the basis of the total mass of the composition.
  • Eligible extreme pressure additives are any extreme pressure additives and anti-wear agents that have been used in a lubricating oil.
  • sulfuric-, phosphoric- and sulfuric-phosphoric extreme pressure additives may be used. Specific examples include phosphorus acid esters, thiophosphorus acid esters, dithiophosphorus acid esters, trithiophosphorus acid esters, phosphoric acid esters, thiophosphoric acid esters, dithiophosphoric acid esters, trithiophosphoric acid esters, amine salts, metal salts or derivatives thereof, dithiocarbamates, zinc dithiocaramates, molybdenum dithiocarbamates, disulfides, polysulfides, sulfurized olefins, and sulfurized fats and oils.
  • the content of the extreme pressure additive if contained in the lubricating oil composition of the present invention is preferably from 0.05 to 5 percent by mass on the basis of the total mass of the composition.
  • corrosion inhibitor examples include benzotriazole-, tolyltriazole-, thiadiazole-, and imidazole-types compounds.
  • demulsifier examples include polyalkylene glycol-based non-ionic surfactants such as polyoxyethylenealkyl ethers, polyoxyethylenealkylphenyl ethers, and polyoxyethylenealkylnaphthyl ethers.
  • metal deactivator examples include imidazolines, pyrimidine derivatives, alkylthiadiazoles, mercaptobenzothiazoles, benzotriazoles and derivatives thereof, 1,3,4-thiadiazolepolysulfide, 1,3,4-thiadiazolyl-2,5-bisdialkyldithiocarbamate, 2-(alkyldithio)benzoimidazole, and ⁇ -(o-carboxybenzylthio)propionitrile.
  • the pour point depressant may be a polymethacrylate polymer that is suitable for a lubricating base oil to be used.
  • the anti-foaming agent examples include silicone oil with a 25°C kinematic viscosity of 100 to 100,000 mm 2 /s, alkenylsuccinic acid derivatives, esters of polyhydroxy aliphatic alcohols and long-chain fatty acids, aromatic amine salts of methylsalicylate and o-hydroxybenzyl alcohol, aluminum stearate, potassium oleate, N-dialkyl-allylamine nitroaminoalkanol, and isoamyloctylphosphate, alkylalkylenediphosphates, metal derivatives of thioethers, metal derivatives of disulfides, fluorine compounds of aliphatic hydrocarbons, triethylsilane, dichlorosilane, alkylphenyl polyethylene glycol ether sulfide, and fluoroalkyl ethers.
  • the corrosion inhibitor, rust inhibitor and demulsifier are each contained in an amount of usually 0.005 to 5 percent by mass
  • the metal deactivator is usually contained in an amount of usually 0.005 to 1 percent by mass
  • the anti-foaming agent is usually contained in an amount of usually 0.0005 to 1 percent by mass, all on the basis of the total mass of the composition.
  • the kinematic viscosity at 100°C of the lubricating oil composition of the present invention is necessarily 7.5 mm 2 /s or higher, preferably 9.3 mm 2 /s or higher, more preferably 10 mm 2 /s or higher.
  • the kinematic viscosity at 100°C is necessarily 15.0 mm 2 /s or lower, preferably 14.5 mm 2 /s or lower, more preferably 12.5 mm 2 /s or lower. If the 100°C kinematic viscosity is lower than 7.5 mm 2 /s, the resulting composition could be poor in film formation capability and thus could cause seizure at bearings. If the 100°C kinematic viscosity is higher than 15.0 mm 2 /s, the resulting composition might not sufficiently cool piston surfaces to be cooled, causing burn of pistons and also could deteriorate fuel efficiency due to the increased friction loss.
  • the base number of the lubricating oil composition of the present invention is necessarily from 4 to 20 mgKOH/g.
  • the lower limit is preferably 5 mgKOH/g or greater, more preferably 5.5 mgKOH/g or greater while the upper limit is preferably 15 mgKOH/g or less, more preferably 10 mgKOH/g or less. If the base number is less than 4 mgKOH/g, the resulting composition could be poor in detergency. If the base number is greater than 20 mgKOH/g, the composition could be less likely to remove mixed foreign substances in a purifier.
  • the lubricating oil composition of the present invention is not only suitably applicable as a system oil for a crosshead-type diesel engine but also can be used for trunk-piston-type diesel engines as well as gasoline, diesel and gas engines of motorcycles, automobiles, power generators and cogeneration units.
  • Lubricating oil compositions of the present invention (Examples 1 to 18) and those for comparison (Comparative Examples 1 to 4) as set forth in Tables 1 and 2 were prepared. Each of the resulting compositions was subjected to a hot tube test, and the results thereof are also set forth in Tables 1 and 2. For Examples 1 to 7 and 10 to 16 and Comparative Examples 1, 3 and 4, the content of the polymer compound and the ratio of the base oil were adjusted so that the 100°C kinematic viscosity of each composition mixed with additives was 11.5 mm 2 /s.
  • the lubricating oil compositions of the present invention has no difference in viscosity change over those of Comparative Examples when tested by 100% fresh oils but are smaller in viscosity increase than the comparative oils when mixed with a cylinder drip oil.
  • the lubricating oil composition of the present invention is smaller in viscosity increase even when mixed with a cylinder drip oil and thus excellent in fuel efficiency and exhibits excellent effects in particular as a system lubricating oil for a crosshead-type diesel engine.

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Claims (12)

  1. Systemschmierölzusammensetzung für einen Dieselmotor vom Kreuzkopf-Typ, umfassend:
    ein Mineralgrundöl und/oder ein synthetisches Grundöl;
    (A) (a-1) ein Sternpolymer mit einer vinylaromatischen Kohlenwasserstoffstruktur im Molekül und/oder (a-2) ein Ethylen-α-Olefin-Copolymer oder eine hydrierte Verbindung davon,
    und mit einer Basenzahl von 4 bis 20 mg KOH/g und einer kinematischen Viskosität bei 100°C von 7,5 bis 12,5 mm2/s;
    wobei Komponente (A) in einer Menge von 2 bis 15 Massenprozent, bezogen auf die Gesamtmasse der Zusammensetzung, enthalten ist.
  2. Systemschmierölzusammensetzung für einen Dieselmotor vom Kreuzkopf-Typ nach Anspruch 1, wobei es sich bei Komponente (a-1) um eine Verbindung mit einer Struktur handelt, in der das Polymer oder Copolymer eines Diens sich radial vom Kern des sich im Zentrum des Moleküls befindenden vinylaromatischen Kohlenwasserstoffs erstreckt.
  3. Systemschmierölzusammensetzung für einen Dieselmotor vom Kreuzkopf-Typ nach Anspruch 1 oder 2, wobei es sich bei dem vinylaromatischen Kohlenwasserstoff um Divinylbenzol handelt.
  4. Systemschmierölzusammensetzung für einen Dieselmotor vom Kreuzkopf-Typ nach einem der Ansprüche 1 bis 3, wobei es sich bei dem Polymer oder Copolymer eines Diens um Polyisopren oder ein Isopren-Styrol-Copolymer handelt.
  5. Systemschmierölzusammensetzung für einen Dieselmotor vom Kreuzkopf-Typ nach einem der Ansprüche 1 bis 4, ferner umfassend mindestens einen Typ aus der Gruppe bestehend aus (B) Metalldetergentien, (C) Zinkdialkyldithiophosphaten, (D) Rostschutzmitteln und (E) aschefreien Dispergiermitteln.
  6. Systemschmierölzusammensetzung für einen Dieselmotor vom Kreuzkopf-Typ nach einem der Ansprüche 1 bis 5, wobei das Grundöl eine kinematische Viskosität bei 100°C von 3,5 bis 9,3 mm2/s aufweist.
  7. Verwendung einer Systemschmierölzusammensetzung für einen Dieselmotor vom Kreuzkopf-Typ, wobei die Systemschmierölzusammensetzung Folgendes umfasst:
    ein Mineralgrundöl und/oder ein synthetisches Grundöl;
    (A) (a-1) ein Sternpolymer mit einer vinylaromatischen Kohlenwasserstoffstruktur im Molekül und/oder (a-2) ein Ethylen-α-Olefin-Copolymer oder eine hydrierte Verbindung davon,
    und mit einer Basenzahl von 4 bis 20 mg KOH/g und einer kinematischen Viskosität bei 100°C von 7,5 bis 15,0 mm2/s;
    wobei Komponente (A) in einer Menge von 2 bis 15 Massenprozent, bezogen auf die Gesamtmasse der Zusammensetzung, enthalten ist.
  8. Verwendung nach Anspruch 7, wobei es sich bei Komponente (a-1) um eine Verbindung mit einer Struktur handelt, in der das Polymer oder Copolymer eines Diens sich radial vom Kern des sich im Zentrum des Moleküls befindenden vinylaromatischen Kohlenwasserstoffs erstreckt.
  9. Verwendung nach Anspruch 7 oder 8, wobei es sich bei dem vinylaromatischen Kohlenwasserstoff um Divinylbenzol handelt.
  10. Verwendung nach einem der Ansprüche 7 bis 9, wobei es sich bei dem Polymer oder Copolymer eines Diens um Polyisopren oder ein Isopren-Styrol-Copolymer handelt.
  11. Verwendung nach einem der Ansprüche 7 bis 10, wobei die Systemschmierölzusammensetzung ferner mindestens einen Typ aus der Gruppe bestehend aus (B) Metalldetergentien, (C) Zinkdialkyldithiophosphaten, (D) Rostschutzmitteln und (E) aschefreien Dispergiermitteln umfasst.
  12. Verwendung nach einem der Ansprüche 7 bis 11, wobei das Grundöl eine kinematische Viskosität bei 100°C von 3,5 bis 9,3 mm2/s aufweist.
EP10839048.5A 2009-12-24 2010-10-08 Systemschmierölzusammensetzung für dieselmotor in kreuzkopfbauart Active EP2518135B2 (de)

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EP2518135A4 (de) 2013-07-24
SG181737A1 (en) 2012-07-30
KR20120123374A (ko) 2012-11-08
US20120258898A1 (en) 2012-10-11
EP2518135A1 (de) 2012-10-31
CN102686712A (zh) 2012-09-19
CN102686712B (zh) 2014-06-25
EP2518135B1 (de) 2015-01-07
WO2011077811A1 (ja) 2011-06-30
KR101728192B1 (ko) 2017-04-18

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