WO2021187372A1 - 潤滑油組成物、内燃機関、及び潤滑油組成物の使用方法 - Google Patents

潤滑油組成物、内燃機関、及び潤滑油組成物の使用方法 Download PDF

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Publication number
WO2021187372A1
WO2021187372A1 PCT/JP2021/010103 JP2021010103W WO2021187372A1 WO 2021187372 A1 WO2021187372 A1 WO 2021187372A1 JP 2021010103 W JP2021010103 W JP 2021010103W WO 2021187372 A1 WO2021187372 A1 WO 2021187372A1
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Prior art keywords
oil composition
lubricating oil
mass
component
group
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PCT/JP2021/010103
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English (en)
French (fr)
Japanese (ja)
Inventor
知行 蓬田
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Idemitsu Kosan Co Ltd
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Idemitsu Kosan Co Ltd
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Priority to JP2022508320A priority Critical patent/JP7596358B2/ja
Priority to CN202180021300.6A priority patent/CN115210343A/zh
Priority to US17/906,207 priority patent/US12091630B2/en
Publication of WO2021187372A1 publication Critical patent/WO2021187372A1/ja
Anticipated expiration legal-status Critical
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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
    • C10M157/00—Lubricating compositions characterised by the additive being a mixture of two or more macromolecular compounds covered by more than one of the main groups C10M143/00 - C10M155/00, each of these compounds being essential
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M145/00—Lubricating compositions characterised by the additive being a macromolecular compound containing oxygen
    • C10M145/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M145/10—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
    • C10M145/12—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 monocarboxylic
    • C10M145/14—Acrylate; Methacrylate
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
    • C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
    • C10M133/16—Amides; Imides
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • C—CHEMISTRY; METALLURGY
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    • 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
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    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/16—Paraffin waxes; Petrolatum, e.g. slack wax
    • C10M2205/163—Paraffin waxes; Petrolatum, e.g. slack wax used as base material
    • C—CHEMISTRY; METALLURGY
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    • 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
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    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/287—Partial esters
    • C10M2207/289—Partial esters containing free hydroxy groups
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    • 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
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    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
    • C10M2215/064—Di- and triaryl amines
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    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
    • C10M2215/086—Imides [having hydrocarbon substituents containing less than thirty carbon atoms]
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
    • C10M2215/24—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions having hydrocarbon substituents containing thirty or more carbon atoms, e.g. nitrogen derivatives of substituted succinic acid
    • C10M2215/28—Amides; Imides
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • 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
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/06—Groups 3 or 13
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    • 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
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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
    • C10N2020/04—Molecular weight; Molecular weight distribution
    • C—CHEMISTRY; METALLURGY
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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
    • C10N2020/071—Branched chain compounds
    • C—CHEMISTRY; METALLURGY
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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
    • C10N2020/073—Star shaped polymers
    • C—CHEMISTRY; METALLURGY
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    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/02—Pour-point; 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
    • C10N2030/04—Detergent property or dispersant property
    • C—CHEMISTRY; METALLURGY
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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
    • C10N2030/40—Low content or no content compositions
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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
    • C10N2030/40—Low content or no content compositions
    • C10N2030/45—Ash-less or low ash content
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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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
    • C10N2030/52—Base number [TBN]
    • C—CHEMISTRY; METALLURGY
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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
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/68—Shear stability
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    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/25—Internal-combustion engines
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    • 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
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    • 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 lubricating oil composition, an internal combustion engine to which the lubricating oil composition is applied, and a method of using the lubricating oil composition.
  • Engine oils used in internal combustion engines such as diesel engines and gasoline engines are required to have fuel-saving performance, and therefore engine oils are being reduced in viscosity.
  • the engine oil having a low viscosity has a problem that it easily becomes a mist.
  • the mist floating inside the internal combustion engine also affects the accumulation of deposits on the piston surface and the consumption of engine oil.
  • various studies have been conducted on a low-viscosity engine oil having an improved effect of suppressing mist formation.
  • Patent Document 1 describes a predetermined kinematic viscosity, CCS viscosity, and NOACK for the purpose of providing a lubricating oil composition for an internal combustion engine, which is excellent in the effect of suppressing mist formation, coking resistance, and fuel saving.
  • a lubricating oil composition for an internal combustion engine is disclosed in which polyisobutylene is blended with a mixed base oil of a poly ⁇ -olefin having a value and a mineral oil having a predetermined viscosity index.
  • the present invention contains a base oil, a comb polymer, and an olefin copolymer, and the content of the comb polymer and the weight average molecular weight of the olefin copolymer are set in a predetermined range, and a predetermined viscosity index and kinematic viscosity are set.
  • a lubricating oil composition adjusted so as to be. Specific aspects of the present invention are as follows [1] to [13]. [1] A lubricating oil composition containing a base oil (A), a comb-shaped polymer (B), and an olefin-based copolymer (C).
  • the content of the component (B) is more than 0.80% by mass based on the total amount of the lubricating oil composition.
  • the weight average molecular weight of the component (C) is 500,000 or more.
  • the viscosity index of the lubricating oil composition is 200 or more, and the kinematic viscosity at 100 ° C. is 9.3 to 11.0 mm 2 / s.
  • Lubricating oil composition [2] The lubricating oil composition according to the above [1], wherein the content ratio [(C) / (B)] of the component (C) to the component (B) is 0.90 or less in terms of mass ratio.
  • the lubricating oil composition according to item 1. [9] The lubricating oil composition according to any one of the above [1] to [8], wherein the SAE viscosity grade of the lubricating oil composition is 0W-30 or 5W-30. [10] The 100 ° C. kinematic viscosity of the lubricating oil composition after ultrasonic irradiation for 30 minutes in accordance with the low output method of JPI-5S-29 is 9.3 mm 2 / s or more. ] To [9]. The lubricating oil composition according to any one of the items. [11] The lubricating oil composition according to any one of the above [1] to [10], which is used for lubricating an internal combustion engine.
  • the lubricating oil composition of one preferred embodiment of the present invention is excellent in at least one of fuel efficiency, shear stability, and an effect of suppressing mist formation, and the lubricating oil composition of one more preferred embodiment is fuel efficient. It has excellent properties, shear stability, and the effect of suppressing mist formation. Therefore, these lubricating oil compositions according to one aspect of the present invention can be suitably applied to lubrication of internal combustion engines.
  • the kinematic viscosity and the viscosity index mean values measured or calculated in accordance with JIS K2283: 2000.
  • the weight average molecular weight (Mw) and the number average molecular weight (Mn) are values in terms of standard polystyrene measured by a gel permeation chromatography (GPC) method, and are specifically described in Examples. Means the value measured by the method.
  • the lubricating oil composition of the present invention contains a base oil (A), a comb polymer (B), and an olefin copolymer (C), has a viscosity index of 200 or more, and has a kinematic viscosity at 100 ° C. It is adjusted to 9.3 to 11.0 mm 2 / s.
  • the viscosity index and kinematic viscosity of the lubricating oil composition of the present invention are mainly adjusted by using the polymer components, component (B) and component (C), in combination.
  • the viscosity index of the lubricating oil composition of the present invention is adjusted to 200 or more, the viscosity change due to a temperature change is small, and the lubricating oil composition can be excellent in fuel saving.
  • the viscosity index of the lubricating oil composition according to one aspect of the present invention is preferably 205 or more, more preferably 208 or more, from the viewpoint of obtaining a lubricating oil composition having a small change in viscosity due to a temperature change and excellent fuel saving. It is more preferably 210 or more, and even more preferably 214 or more.
  • the lubricating oil composition of the present invention has a kinematic viscosity at 100 ° C. of 9.3 to 11.0 mm 2 / s. Therefore, the SAE viscosity grade of the lubricating oil composition of the present invention corresponds to 0W-30 or 5W-30.
  • a lubricating oil composition having a low viscosity has good fuel efficiency, but tends to become a mist. For example, if the mist floats inside the internal combustion engine, it causes adverse effects such as an increase in deposit accumulation on the piston surface and an increase in consumption of the lubricating oil composition.
  • the effect of suppressing mist formation is improved by containing a predetermined amount of the comb-shaped polymer (B) as a polymer component.
  • the addition of the component (B) may cause a problem that the shear stability is lowered.
  • the lubricating oil composition of the present invention contains the olefin copolymer (C) having a predetermined weight average molecular weight together with the component (B) as a polymer component.
  • the lubricating oil composition has improved shear stability while improving the effect of suppressing mist formation.
  • the content ratio of the component (C) to the component (B) [(C) / (B)] is a mass ratio, and the effect of suppressing mist formation is further improved.
  • it is preferably 0.90 or less, more preferably 0.85 or less, still more preferably 0.80 or less, still more preferably 0.70 or less, and further 0.65 or less.
  • the lubricating oil composition may be 0.60 or less, 0.55 or less, 0.50 or less, 0.45 or less, 0.40 or less, or 0.35 or less, and the shear stability is further improved.
  • the content ratio [(C) / (B)] of the component (C) to the component (B) is preferably 0.05 to 0.90, more preferably 0. It is 10 to 0.85, more preferably 0.15 to 0.80, and even more preferably 0.20 to 0.70.
  • the total content of the component (B) and the component (C) is the lubricating oil from the viewpoint of adjusting the viscosity index and the kinematic viscosity of the lubricating oil composition within the above ranges.
  • the total amount (100% by mass) of the composition preferably 0.90 to 8.00% by mass, more preferably 1.10 to 6.00% by mass, still more preferably 1.30 to 5.00% by mass. Even more preferably, it is 1.50 to 4.00% by mass, and particularly preferably 1.70 to 3.00% by mass.
  • the components (B) and (C) are often marketed in the form of a solution dissolved in a diluted oil in consideration of handleability and solubility with the component (A).
  • the respective contents of the components (B) and (C) are the resins constituting the components (B) and (C) excluding the mass of the diluted oil in the solution diluted with the diluted oil. It is the content converted into minutes.
  • the lubricating oil composition according to one aspect of the present invention contains at least one selected from an ash-free dispersant (D), a metal-based cleaning agent (E), an antioxidant (F), and an abrasion resistant agent (G). It is preferable to further contain it. Further, the lubricating oil composition according to one aspect of the present invention further contains additives for lubricating oil other than the components (B) to (G), if necessary, as long as the effects of the present invention are not impaired. You may.
  • the total content of the components (A), (B) and (C) is preferably 50 based on the total amount (100% by mass) of the lubricating oil composition. Mass% or more, more preferably 55% by mass or more, still more preferably 60% by mass or more, still more preferably 65% by mass or more, particularly preferably 70% by mass or more, and further 72% by mass or more, or 75% by mass. The above may be applied.
  • the total content of the components (A), (B), (C), (D), (E), (F) and (G) is the lubrication.
  • the total amount (100% by mass) of the oil composition it is preferably 60% by mass or more, more preferably 65% by mass or more, further preferably 70% by mass or more, still more preferably 75% by mass or more, and particularly preferably 80% by mass. % Or more, and further, it may be 82% by mass or more, 85% by mass or more, 87% by mass or more, or 90% by mass or more.
  • Base oil examples include one or more selected from mineral oils and synthetic oils.
  • Mineral oils include, for example, atmospheric residual oil obtained by atmospheric distillation of crude oils such as paraffin crude oil, intermediate base crude oil, and naphthenic crude oil; and distillate oil obtained by vacuum distillation of these atmospheric residual oils. Examples thereof include refined oils obtained by subjecting the distillate oil to one or more refining treatments such as solvent removal, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, and hydrorefining.
  • Examples of the synthetic oil include poly such as an ⁇ -olefin homopolymer or an ⁇ -olefin copolymer (for example, an ⁇ -olefin copolymer having 8 to 14 carbon atoms such as an ethylene- ⁇ -olefin copolymer).
  • Examples thereof include synthetic oil (GTL) obtained by isomerizing the produced wax (GTL wax (Gas To Liquids WAX)).
  • the component (A) used in one aspect of the present invention includes mineral oils classified into Group 2 and Group 3 of the API (American Petroleum Institute) base oil category, and one or more selected from synthetic oils. Is preferable.
  • the kinematic viscosity of the component (A) used in one aspect of the present invention at 100 ° C. is preferably 2.0 to 20.0 mm 2 / s, more preferably 2.0 to 15.0 mm 2 / s, and even more preferably 2.0 to 15.0 mm 2 / s. It is 3.0 to 12.0 mm 2 / s, more preferably 3.2 to 9.0 mm 2 / s, and particularly preferably 3.5 to 7.0 mm 2 / s.
  • the viscosity index of the component (A) used in one aspect of the present invention is appropriately set according to the use of the lubricating oil composition, but is preferably 70 or more, more preferably 80 or more, still more preferably 90 or more. , More preferably 100 or more, and particularly preferably 110 or more.
  • the kinematic viscosity and viscosity index of the mixed oil are preferably in the above ranges.
  • the content of the component (A) is preferably 30 to 99.0% by mass, more preferably 40, based on the total amount (100% by mass) of the lubricating oil composition. It is ⁇ 98.5% by mass, more preferably 50-98.0% by mass, still more preferably 60-97.0% by mass, and particularly preferably 65-95.0% by mass.
  • the content of the component (A) may be 67% by mass or more, 70% by mass or more, or 72% by mass or more based on the total amount (100% by mass) of the lubricating oil composition, and 93% by mass or more. It may be 0.0% by mass or less, 90.0% by mass or less, 87.0% by mass or less, 85.0% by mass or less, 83.0% by mass or less, or 80.0% by mass or less.
  • Component (B) comb-shaped polymer>
  • the comb-shaped polymer which is the component (B) used in one aspect of the present invention may be a polymer having a structure having a large number of three-pronged branch points in the main chain having high molecular weight side chains.
  • the viscosity index of the lubricating oil composition is adjusted to improve fuel saving performance, and the effect of suppressing mist formation is also improved.
  • the content of the component (B) is the content of the lubricating oil composition from the viewpoint of obtaining a lubricating oil composition excellent in fuel saving while further improving the effect of suppressing mist formation.
  • the total amount (100% by mass) it is more than 0.80% by mass, but preferably 0.85% by mass or more, more preferably 0.88% by mass or more, still more preferably 1.00% by mass or more, still more. It is preferably 1.20% by mass or more, particularly preferably 1.35% by mass or more, and further 1.40% by mass or more, 1.45% by mass or more, 1.47% by mass or more, or 1.50% by mass.
  • the content of the component (B) is preferably more than 0.80% by mass and 6.00% by mass or less based on the total amount (100% by mass) of the lubricating oil composition. More preferably 0.85 to 5.00% by mass, more preferably 0.88 to 4.00% by mass, still more preferably 1.00 to 3.50% by mass, still more preferably 1.20 to 3.00. It is mass%, particularly preferably 1.35 to 2.50 mass%.
  • the weight average molecular weight (Mw) of the component (B) used in one aspect of the present invention is preferably 20 from the viewpoint of making a lubricating oil composition excellent in fuel efficiency while further improving the effect of suppressing mist formation.
  • the weight average molecular weight (Mw) of the component (B) is preferably 200,000 to 1,000,000, more preferably 250,000 to 900,000, still more preferably 300,000 to 800,000, and even more preferably 350,000 to 750,000. , Particularly preferably 450,000 to 700,000.
  • the molecular weight distribution (Mw / Mn) of the component (B) used in one embodiment of the present invention is a lubrication in which the effect of suppressing mist formation is further improved.
  • Mn indicates the number average molecular weight of the component (B)
  • Mn indicates the number average molecular weight of the component (B)
  • Mn indicates the number average molecular weight of the component (B)
  • Mn indicates the number average molecular weight of the component (B)
  • Mn indicates the number average molecular weight of the component (B)
  • Mn indicates the number average molecular weight of the component (B)
  • Mn indicates the number average molecular weight of the component (B)
  • Mn indicates the number average molecular weight of the component (B)
  • Mn indicates the number average molecular weight of the component (B)
  • Mn indicates the number average molecular weight of the component (B)
  • Mn indicates the number average molecular weight of the component (B)
  • Mn indicates the number
  • the molecular weight distribution (Mw / Mn) of the component (B) is preferably 1.01 to 8.00, more preferably 1.02 to 7.00, still more preferably 1.05 to 6.00, and further. It is preferably 1.07 to 4.00, particularly preferably 1.10 to 3.00.
  • the SSI (shear stability index) of the component (B) used in one aspect of the present invention is preferably 100 or less, more preferably 80, from the viewpoint of obtaining a lubricating oil composition having a further improved effect of suppressing mist formation. Below, it is more preferably 70 or less, still more preferably 60 or less, and particularly preferably 50 or less.
  • the SSI of the component (B) is usually 0.1 or more, although there is no particular limitation on the lower limit value.
  • the SSI shear stability index
  • SSI (%) (Kv 0 -Kv 1 ) / (Kv 0- Kv oil ) x 100
  • Kv 0 is the value of the kinematic viscosity of the sample oil obtained by diluting the polymer component with mineral oil at 100 ° C.
  • Kv 1 is the value of the sample oil obtained by diluting the polymer component with mineral oil. It is a value of kinematic viscosity at 100 ° C. after irradiation with ultrasonic waves for 30 minutes according to the output method according to the procedure of 5S-29-06.
  • Kv oil is a value of the kinematic viscosity of the mineral oil used when diluting the polymer component at 100 ° C.
  • the SSI value of the component (B) changes depending on the structure of the comb-shaped polymer. Specifically, there is a tendency shown below, and the value of SSI of the component (B) can be easily adjusted by considering these matters.
  • the following items are merely examples and can be adjusted by considering items other than these items.
  • -The side chain of the comb-shaped polymer is composed of macromonomer (x1), and the content of the structural unit (X1) derived from the macromonomer (x1) is 0.5 based on the total amount (100 mol%) of the structural unit.
  • Comb-shaped polymers having a molar% or more tend to have a low SSI value.
  • the larger the molecular weight of the macromonomer (x1) constituting the side chain of the comb-shaped polymer the lower the SSI value tends to be.
  • a polymer having at least a structural unit (X1) derived from the macromonomer (x1) is preferable.
  • This structural unit (X1) corresponds to the above-mentioned "high molecular weight side chain".
  • the above-mentioned "macromonomer (x1)” means a high molecular weight monomer having a polymerizable functional group, and is preferably a high molecular weight monomer having a polymerizable functional group at the terminal.
  • the content of the constituent unit (X1) is preferably 0.5 to 20 mol% based on the total amount (100 mol%) of the constituent units of the component (B). It is more preferably 0.7 to 10 mol%, still more preferably 0.9 to 5 mol%.
  • the content of each structural unit in the component (B) and the component (C) means a value calculated by analyzing the 13 C-NMR quantitative spectrum.
  • the number average molecular weight (Mn) of the macromonomer (x1) is preferably 300 or more, more preferably 400 or more, further preferably 500 or more, and preferably 100,000 or less, more preferably 50,000 or less. , More preferably 20,000 or less. That is, the number average molecular weight (Mn) of the macromonomer (x1) is preferably 300 to 100,000, more preferably 400 to 50,000, and even more preferably 500 to 20,000.
  • the macromonomer (x1) may have, for example, one or more repeating units represented by the following general formulas (i) to (iii) in addition to the above-mentioned polymerizable functional group.
  • R b1 is a linear or branched alkylene group having 1 to 10 carbon atoms.
  • R b2 is a linear or branched alkylene group having 2 to 4 carbon atoms.
  • R b3 is a hydrogen atom or a methyl group.
  • R b4 is a linear or branched alkyl group having 1 to 10 carbon atoms.
  • the macromonomer (x1) is preferably a polymer having a repeating unit represented by the general formula (i), and R b1 in the general formula (i) is 1,2. More preferably, it is a polymer having a repeating unit (X1-1) which is at least one of a-butylene group and a 1,4-butylene group.
  • the content of the repeating unit (X1-1) is preferably 1 to 100 mol%, more preferably 20 to 95 mol%, still more preferably, based on the total amount (100 mol%) of the constituent units of the macromonomer (x1). Is 40 to 90 mol%, more preferably 50 to 80 mol%.
  • the macromonomer (x1) is a copolymer having two or more repeating units selected from the general formulas (i) to (iii)
  • the form of copolymerization is a block copolymer. It may be a random copolymer or a random copolymer.
  • the component (B) used in one embodiment of the present invention may be a copolymer composed of only a structural unit (X1) derived from one type of macromonomer (x1), or is derived from two or more types of macromonomers (x1). It may be a copolymer having a structural unit (X1). Further, the component (B) used in one embodiment of the present invention has a structural unit (X1) derived from the macromonomer (x1) and a structural unit (X2) derived from a monomer other than the macromonomer (x1). It may be a copolymer.
  • a side chain containing a structural unit (X1) derived from a macromonomer (x1) is used as opposed to a main chain containing a structural unit (X2) derived from a monomer (x2).
  • a copolymer having the above is preferable.
  • Examples of the monomer (x2) include alkyl (meth) acrylate, nitrogen atom-containing vinyl monomer, hydroxyl group-containing vinyl monomer, phosphorus atom-containing monomer, aliphatic hydrocarbon-based vinyl monomer, and alicyclic type.
  • Hydrocarbon-based vinyl monomers, vinyl esters, vinyl ethers, vinyl ketones, epoxy group-containing vinyl monomers, halogen element-containing vinyl monomers, unsaturated polycarboxylic acid esters, (di) alkyl fumarate, ( D) Alkyl maleate, aromatic hydrocarbon-based vinyl monomer and the like can be mentioned.
  • the monomer (x2) a monomer other than the phosphorus atom-containing monomer and the aromatic hydrocarbon-based vinyl monomer is preferable, and the monomer represented by the following general formula (a1), alkyl (meth). ) It is more preferable to contain at least one selected from acrylate and a hydroxyl group-containing vinyl monomer, and further preferably to contain at least a hydroxyl group-containing vinyl monomer (x2-d).
  • R b11 is a hydrogen atom or a methyl group.
  • R b12 is a single bond, linear or branched alkylene group having 1 to 10 carbon atoms, -O-, or -NH-.
  • R b13 is a linear or branched alkylene group having 2 to 4 carbon atoms.
  • n represents an integer of 1 or more (preferably an integer of 1 to 20, more preferably an integer of 1 to 5).
  • the plurality of R b13s may be the same or different, and the (R b13 O) n portion may be a random bond or a block bond.
  • R b14 is a linear or branched alkyl group having 1 to 60 carbon atoms (preferably 10 to 50, more preferably 20 to 40).
  • the lubricating oil composition of the present invention contains an olefin copolymer having a weight average molecular weight (Mw) of 500,000 or more as a component (C).
  • Mw weight average molecular weight
  • the viscosity index of the lubricating oil composition is adjusted to improve fuel saving performance, and the effect of suppressing mist formation is good. At the same time, the shear stability is improved.
  • the weight average molecular weight (Mw) of the component (C) used in one embodiment of the present invention from the viewpoint of obtaining a lubricating oil composition having improved shear stability while being excellent in fuel efficiency and having a good effect of suppressing mist formation.
  • Mw weight average molecular weight
  • the weight average molecular weight (Mw) of the component (C) is preferably 500,000 to 1,000,000, more preferably 520,000 to 900,000, still more preferably 550,000 to 800,000, and even more preferably 570,000 to 750,000. Is.
  • the molecular weight distribution (Mw / Mn) of the component (C) used in one aspect of the present invention is excellent in fuel efficiency and suppresses mist formation.
  • Mn indicates the number average molecular weight of the component (C)
  • Mn indicates the number average molecular weight of the component (C)
  • the molecular weight distribution (Mw / Mn) of the component (C) is preferably 1.001 to 8.00, more preferably 1.005 to 7.00, still more preferably 1.01 to 6.00, and further. It is preferably 1.02 to 3.00, and particularly preferably 1.03 to 2.00.
  • the SSI (shear stability index) of the component (C) used in one aspect of the present invention is preferably 60 or less, more preferably 40 or less, from the viewpoint of obtaining a lubricating oil composition with further improved shear stability. It is more preferably 30 or less, still more preferably 20 or less, and particularly preferably 15 or less.
  • the SSI of the component (C) is usually 0.1 or more, although there is no particular limitation on the lower limit value.
  • the content of the component (C) is the content of the lubricating oil composition from the viewpoint of obtaining a lubricating oil composition having a better effect of suppressing mist formation and shear stability.
  • the total amount (100% by mass) preferably 0.10 to 2.00% by mass, more preferably 0.12 to 1.80% by mass, more preferably 0.15 to 1.70% by mass, still more preferably. 0.17 to 1.50% by mass, still more preferably 0.20 to 1.20% by mass, still more preferably 0.23 to 1.00% by mass, still more preferably 0.25 to 0.80% by mass.
  • the component (C) used in one embodiment of the present invention is a copolymer having a structural unit derived from a monomer having an alkenyl group, and has, for example, 2 to 20 carbon atoms (preferably 2 to 16 carbon atoms, more preferably 2 to 16 carbon atoms).
  • Examples thereof include ⁇ -olefin copolymers of 2 to 14), and more specific examples thereof include ethylene- ⁇ -olefin copolymers, styrene-diene copolymers, and styrene-isoprene copolymers.
  • the component (C) contains a star-shaped polymer (C1) from the viewpoint of obtaining a lubricating oil composition having a better effect of suppressing mist formation and shear stability. Is preferable.
  • the content ratio of the component (C1) in the component (C) is based on the total amount (100% by mass) of the component (C) contained in the lubricating oil composition. It is preferably 50 to 100% by mass, more preferably 70 to 100% by mass, still more preferably 80 to 100% by mass, still more preferably 90 to 100% by mass, and particularly preferably 95 to 100% by mass.
  • the star-shaped polymer which is the component (C1) used in one aspect of the present invention may be a polymer having a structure in which three or more chain polymers are bonded at one point.
  • the chain polymer constituting the component (C1) include a copolymer of a vinyl aromatic monomer and a conjugated diene monomer, a hydride thereof, and the like.
  • the vinyl aromatic monomer include styrene, alkyl-substituted styrene having 8 to 16 carbon atoms, alkoxy-substituted styrene having 8 to 16 carbon atoms, vinyl naphthalene, and alkyl-substituted vinyl naphthalene having 8 to 16 carbon atoms.
  • conjugated diene monomer examples include conjugated diene having 4 to 12 carbon atoms, and specifically, 1,3-butadiene, isoprene, piperylene, 4-methylpenta-1,3-diene, and 3,4-dimethyl-1. , 3-Hexadiene, 4,5-diethyl-1,3-octadiene and the like.
  • the lubricating oil composition of one aspect of the present invention may contain a viscosity index improver other than the components (B) and (C) as long as the effects of the present invention are not impaired.
  • the content of the viscosity index improver other than the components (B) and (C) is preferably 100 parts by mass based on the total amount of the components (B) and (C) contained in the lubricating oil composition. Is 0 to 50 parts by mass, more preferably 0 to 30 parts by mass, still more preferably 0 to 10 parts by mass, and even more preferably 0 to 1 part by mass.
  • the lubricating oil composition of one aspect of the present invention does not substantially contain a polymethacrylate-based viscosity index improver. Is preferable.
  • substantially free of the polymethacrylate-based viscosity index improver means that the polymethacrylate-based viscosity index improver is blended with a predetermined intention and contained in the lubricating oil composition. It is a regulation excluding various aspects.
  • the components (B) and (C) are sheared. It is not excluded even when a part of these separated components corresponds to a polymer corresponding to a polymethacrylate-based viscosity index improver and is contained in a lubricating oil composition.
  • the specific content of the polymethacrylate-based viscosity index improver is preferably less than 10 parts by mass, more preferably less than 100 parts by mass, based on 100 parts by mass of the total amount of the components (B) and (C) contained in the lubricating oil composition. Is less than 5 parts by mass, more preferably less than 1 part by mass, even more preferably less than 0.1 parts by mass, and particularly preferably less than 0.01 parts by mass.
  • the polymethacrylate-based viscosity index improver means a polymer having at least a structural unit derived from alkyl methacrylate, which does not correspond to the components (B) and (C).
  • the lubricating oil composition of one aspect of the present invention preferably further contains an ashless dispersant (D).
  • the ashless dispersant which is the component (D)
  • the component (D) may be used alone or in combination of two or more.
  • Examples of the component (D) used in one embodiment of the present invention include monoimide succinate, bisimide succinate, benzylamine, succinate ester, and boron-modified products thereof.
  • the component (D) used in one embodiment of the present invention preferably contains at least one selected boron-modified product of succinimide and succinimide, and succinimide and boron of succinimide. It is more preferable to include a modified product together.
  • alkenyl succinate monoimide represented by the following general formula (d-1) and alkenyl succinate bisimide represented by the following general formula (d-2) are preferable.
  • RA , RA1 and RA2 are independently alkenyls having a mass average molecular weight (Mw) of 500 to 3000 (preferably 1000 to 3000). Is the basis.
  • alkenyl group include a polybutenyl group, a polyisobutenyl group, an ethylene-propylene copolymer and the like, and a polybutenyl group or a polyisobutenyl group is preferable.
  • R B, R B1 and R B2 are each independently an alkylene group having 2 to 5 carbon atoms.
  • RC and RC1 are independent hydrogen atoms, alkyl groups having 1 to 10 carbon atoms, or groups represented by-(AO) n- H (however, A is an independent group having 1 to 10 carbon atoms). It is an alkylene group of 2 to 4 and n is an integer of 1 to 10).
  • x1 is an integer of 1 to 10, preferably an integer of 2 to 5, and more preferably 3 or 4.
  • x2 is an integer of 0 to 10, preferably an integer of 1 to 5, and more preferably an integer of 2 to 4.
  • the component (D) used in the present invention preferably contains a non-boron-modified alkenyl succinimide.
  • boron-modified product of succinate imide used as the component (D) in one aspect of the present invention for example, a boron-modified product of alkenyl succinate monoimide represented by the general formula (d-1) and a boron-modified product of alkenyl succinate monoimide are used. At least one selected from the boron-modified product of bisimide alkenyl succinate represented by the following general formula (b-2) is preferable, and the boron-modified product of monoimide alkenyl succinate represented by the following general formula (b-1) is preferable. More preferred.
  • the ratio [B / N] of the boron atom to the nitrogen atom constituting the boron-modified product of imide succinate is preferably 0.01 or more, more preferably 0.05 or more, still more preferably 0.05 or more. It is 0.1 or more, more preferably 0.2 or more, and particularly preferably 0.3 or more.
  • a boron atom derived from a boron-modified product of succinate imide and succinate imide (including both a non-boron-modified succinate imide and a boron-modified product of succinate imide).
  • the content ratio [B / N] to the nitrogen atom is preferably 0.01 to 0.60, more preferably 0.05 to 0.50, still more preferably 0.10 to 0.45, in terms of mass ratio. Even more preferably, it is 0.15 to 0.40, and particularly preferably 0.20 to 0.35.
  • the content of a boron atom means a value measured according to JPI-5S-38-2003.
  • the content of imide succinate in terms of nitrogen atom is preferably 0.005 to 0.30 based on the total amount (100% by mass) of the lubricating oil composition. It is by mass, more preferably 0.01 to 0.25% by mass, still more preferably 0.02 to 0.20% by mass, and even more preferably 0.04 to 0.15% by mass.
  • the content of a nitrogen atom means a value measured according to JIS K2609.
  • the content of the boron atom derived from the boron-modified product of imide succinate is preferably 0.001 based on the total amount (100% by mass) of the lubricating oil composition. It is ⁇ 0.20% by mass, more preferably 0.005 to 0.15% by mass, still more preferably 0.01 to 0.10% by mass, still more preferably 0.015 to 0.05% by mass.
  • the lubricating oil composition of one aspect of the present invention preferably further contains a metal-based cleaning agent (E).
  • the component (E) may be used alone or in combination of two or more.
  • the component (E) used in one embodiment of the present invention is at least one selected from metal salicylate, metal phenate, and metal sulfonate, which contains a metal atom selected from an alkali metal atom and an alkaline earth metal atom. Is preferable. As the metal atom, sodium, calcium, magnesium, or barium is preferable, and calcium is more preferable. That is, the component (E) is preferably a calcium-based cleaning agent.
  • the metal sulfonate is preferably a compound represented by the following general formula (e-1), and the metal salicylate is preferably a compound represented by the following general formula (e-2) as the metal phenate. Is preferably a compound represented by the following general formula (e-3).
  • M is a metal atom selected from alkali metals and alkaline earth metals, and sodium, calcium, magnesium, or barium is preferable, and calcium is more preferable.
  • M' is an alkaline earth metal, preferably calcium, magnesium, or barium, and more preferably calcium.
  • y is an integer of 0 or more, preferably an integer of 0 to 3.
  • p is a valence of M and is 1 or 2.
  • R is a hydrogen atom or a hydrocarbon group having 1 to 18 carbon atoms.
  • Examples of the hydrocarbon group that can be selected as R include an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 18 ring-forming carbon atoms, and 6 to 18 ring-forming carbon atoms. Examples thereof include an aryl group of 7 to 18, an alkylaryl group having 7 to 18 carbon atoms, and an arylalkyl group having 7 to 18 carbon atoms.
  • the base value of the component (E) is preferably 0 to 600 mgKOH / g.
  • the component (E) contains a superbasic metal-based cleaning agent having a base value of 100 mgKOH / g or more.
  • the base value of the superbasic metal-based cleaning agent is 100 mgKOH / g or more, preferably 150 to 500 mgKOH / g, and more preferably 200 to 400 mgKOH / g.
  • the "base value" of the component (E) is defined as 7. of JIS K2501 "Petroleum products and lubricating oil-neutralization value test method". It means the base value by the "perchloric acid method" measured according to.
  • the content of the component (E) in terms of metal atom is preferably 100 to 6000 mass ppm based on the total amount (100% by mass) of the lubricating oil composition. It is preferably 300 to 5000 mass ppm, more preferably 600 to 4500 mass ppm, still more preferably 1000 to 4000 mass ppm, and particularly preferably 1500 to 3500 mass ppm.
  • the content of a metal atom means a value measured according to JPI-5S-38-2003.
  • the lubricating oil composition used in one aspect of the present invention preferably further contains an antioxidant (F).
  • the component (F) may be used alone or in combination of two or more.
  • the component (F) used in one embodiment of the present invention examples include amine-based antioxidants, phenol-based antioxidants, molybdenum-based antioxidants, sulfur-based antioxidants, phosphorus-based antioxidants, and the like.
  • the component (F) preferably contains one or more selected from amine-based antioxidants and phenol-based antioxidants, and more preferably contains both amine-based antioxidants and phenol-based antioxidants. preferable.
  • amine-based antioxidant examples include diphenylamine and diphenylamine-based antioxidants such as alkylated diphenylamine having an alkyl group having 3 to 20 carbon atoms; ⁇ -naphthylamine, phenyl- ⁇ -naphthylamine, and alkyl having 3 to 20 carbon atoms.
  • examples include naphthylamine-based antioxidants having a group such as substituted phenyl- ⁇ -naphthylamine; and the like.
  • phenolic antioxidant examples include 2,6-di-t-butylphenol, 2,6-di-t-butyl-4-methylphenol, 2,6-di-t-butyl-4-ethylphenol, and the like.
  • the content of the component (F) is preferably 0.01 to 6.0% by mass based on the total amount (100% by mass) of the lubricating oil composition. It is preferably 0.05 to 4.0% by mass, more preferably 0.10 to 3.0% by mass, and even more preferably 0.50 to 2.0% by mass.
  • the lubricating oil composition of one aspect of the present invention preferably further contains an abrasion resistant agent (G).
  • the component (G) may be used alone or in combination of two or more.
  • Examples of the component (G) used in one embodiment of the present invention include zinc dialkyldithiophosphate (ZnDTP), zinc phosphate, zinc dithiocarbamate, molybdenum dithiocarbamate, molybdenum dithiophosphate, disulfides, olefin sulfides, and fats and oils sulfides. , Sulfurized esters, thiocarbonates, thiocarbamates, polysulfides and other sulfur-containing compounds; phosphite esters, phosphoric acid esters, phosphonic acid esters and phosphorus-containing compounds such as amine salts or metal salts thereof. Examples include sulfur and phosphorus-containing abrasion resistant agents such as thioaroic acid esters, thiophosphate esters, thiophosphonic acid esters, and amine salts or metal salts thereof.
  • the component (G) contains zinc dialkyldithiophosphate (ZnDTP).
  • ZnDTP zinc dialkyldithiophosphate
  • Examples of zinc dithiophosphate include compounds represented by the following general formula (g-1).
  • R 1 to R 4 independently represent hydrocarbon groups and may be the same or different from each other.
  • the number of carbon atoms of the hydrocarbon group that can be selected as R 1 to R 4 is preferably 1 to 20, more preferably 1 to 16, still more preferably 3 to 12, and even more preferably 3 to 10.
  • Alkyl groups such as group, phenyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group; octenyl group, nonenyl group, decenyl group, undecenyl group, dodecenyl group, tridecenyl group, tetradecenyl group.
  • cyclohexyl group dimethylcyclohexyl group, ethylcyclohexyl group, methylcyclohexylmethyl group, cyclohexylethyl group, propylcyclohexyl group, butylcyclohexyl group, heptylcyclohexyl group and other cycloalkyl groups; phenyl group, naphthyl group , Aryl groups such as anthracenyl group, biphenyl group, terphenyl group; alkylaryl groups such as tolyl group, dimethylphenyl group, butylphenyl group, nonylphenyl group, methylbenzyl group, dimethylnaphthyl group; phenylmethyl group, phenylethyl group , Arylalkyl groups such as diphenylmethyl group and the like.
  • hydrocarbon group such as the hydrocarbon group
  • the content of the component (G) is preferably 0.01 to 15.0% by mass, more preferably, based on the total amount (100% by mass) of the lubricating oil composition. Is 0.05 to 12.0% by mass, more preferably 0.10 to 10.0% by mass, and even more preferably 0.20 to 8.0% by mass.
  • the content of ZnDTP in terms of zinc atom is the total amount (100 mass) of the lubricating oil composition. %) On a basis, preferably 0.01 to 1.0% by mass, more preferably 0.03 to 0.80% by mass, still more preferably 0.05 to 0.60% by mass, still more preferably 0.08. It is about 0.50% by mass, particularly preferably 0.10 to 0.40% by mass.
  • the phosphorus atom equivalent content of ZnDTP is preferably 0.01 to 1.0% by mass, more preferably 0.02 to 0.70, based on the total amount (100% by mass) of the lubricating oil composition.
  • the content of zinc atom and phosphorus atom means the value measured according to JPI-5S-38-2003.
  • the lubricating oil composition of one aspect of the present invention may further contain additives for lubricating oil other than the components (B) to (G), if necessary, as long as the effects of the present invention are not impaired.
  • additives for lubricating oil include pour point lowering agents, anti-emulsifiers, friction modifiers, corrosion inhibitors, metal deactivators, rust inhibitors, antistatic agents, defoamers and the like. ..
  • Each of these additives for lubricating oil may be used alone or in combination of two or more.
  • each of these additives for lubricating oil can be appropriately adjusted within a range that does not impair the effects of the present invention, but each addition is based on the total amount (100% by mass) of the lubricating oil composition. Independently for each agent, it is usually 0.001 to 15% by mass, preferably 0.005 to 10% by mass, and more preferably 0.01 to 5% by mass.
  • the method for producing the lubricating oil composition according to one aspect of the present invention is not particularly limited, but from the viewpoint of productivity, the components (A), the components (B) and (C), and, if necessary, the components It is preferable that the method comprises a step of blending (D) to (G) and other additives for lubricating oil. From the viewpoint of compatibility with the component (A), it is preferable that the components (B) and (C) are in the form of a solution dissolved in a diluted oil, and the solution is blended with the component (A).
  • the SAE viscosity grade of the lubricating oil composition of one aspect of the present invention is preferably 0W-30 or 5W-30. In these SAE viscosity grades, various performances such as mist formation suppressing effect, shear stability, and fuel saving can be sufficiently exhibited.
  • the lubricating oil composition of one aspect of the present invention satisfies the following requirements (I) and (II).
  • -Requirement (I) The 100 ° C. kinematic viscosity of the lubricating oil composition after ultrasonic irradiation for 30 minutes in accordance with the low output method of JPI-5S-29 is 9.3 mm 2 / s or more.
  • [Mistification rate] (%) [Mistification mass] / [Degraded oil mass] x 100
  • Requirement (I) defines the shear stability of the lubricating oil composition.
  • the 100 ° C. kinematic viscosity specified in the requirement (I) is a value calculated by preparing a lubricating oil composition by the method described in Examples described later and under the measurement conditions described in Examples.
  • Requirement (II) stipulates the effect of suppressing the formation of mist in the lubricating oil composition.
  • the mist formation rate specified in Requirement (II) is less than 2.00%, but is preferably 1.98% or less, more preferably 1.95% or less, still more preferably 1.80% or less, and further. It is preferably 1.50% or less, and particularly preferably 1.30% or less.
  • the mistification rate specified in Requirement (II) is a value calculated under the measurement conditions described in Examples after preparing the lubricating oil composition by the method described in Examples described later.
  • the lubricating oil composition of one aspect of the present invention is excellent in various performances such as an effect of suppressing mist formation, shear stability, and fuel efficiency. Therefore, the lubricating oil composition of one aspect of the present invention is preferably used for lubricating an internal combustion engine such as a diesel engine or a gas engine, and more preferably used for lubricating a diesel engine.
  • the present invention may also provide the following [1] and [2].
  • Examples 1 to 4 Comparative Examples 1 to 6 Various additives were blended with the base oil according to the types and blending amounts shown in Tables 1 and 2, and lubricating oil compositions were prepared respectively.
  • the amounts of the comb-shaped polymer, the star-shaped polymer, and the PMA blended as the polymers shown in Tables 1 and 2 are the masses of the diluted oil when blended in a state of being dissolved in the diluted oil. It is the compounding amount in terms of active ingredient (converted to solid content (resin content)) excluding.
  • the details of the base oil and various additives used for preparing the lubricating oil composition are as follows.
  • the prepared lubricating oil composition was measured or calculated for 40 ° C. kinematic viscosity, 100 ° C. kinematic viscosity, and viscosity index according to the above method, and the following characteristics were measured. These results are shown in Tables 1 and 2.
  • mist conversion rate [Mistification mass] / [Degraded oil mass] x 100
  • the test equipment and test conditions used to mist the deteriorated oil are as follows. -Test equipment: TACO mist measuring equipment (model number: C3-0807, manufactured by Azbil TACO Co., Ltd.) ⁇ Air pressure: 0.2MPa -Sample oil amount (deteriorated oil mass): 40 g
  • the lubricating oil compositions prepared in Examples 1 to 4 had excellent results in suppressing mist formation and shear stability while having a low viscosity. Therefore, the lubricating oil compositions prepared in Examples 1 to 4 can be suitably applied to lubrication of internal combustion engines (particularly diesel engines).
  • the lubricating oil composition prepared in Comparative Example 1 had a good effect of suppressing mist formation, but was inferior in shear stability.
  • the lubricating oil compositions prepared in Comparative Examples 2 to 5 have insufficient effects of suppressing mist formation, and the lubricating oil compositions of Comparative Examples 2 to 4 are also inferior in shear stability. rice field.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
PCT/JP2021/010103 2020-03-16 2021-03-12 潤滑油組成物、内燃機関、及び潤滑油組成物の使用方法 Ceased WO2021187372A1 (ja)

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WO2016043333A1 (ja) * 2014-09-19 2016-03-24 出光興産株式会社 潤滑油組成物、及び当該潤滑油組成物の製造方法
JP2017508053A (ja) * 2014-03-19 2017-03-23 ザ ルブリゾル コーポレイションＴｈｅ Ｌｕｂｒｉｚｏｌ Ｃｏｒｐｏｒａｔｉｏｎ ポリマーのブレンドを含有する潤滑剤
JP2019094473A (ja) * 2017-11-28 2019-06-20 出光興産株式会社 潤滑油組成物
JP2019178296A (ja) * 2018-03-30 2019-10-17 出光興産株式会社 潤滑油組成物、及び潤滑油組成物の使用方法

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CA2693461C (en) * 2007-07-09 2015-11-17 Evonik Operations Gmbh Use of comb polymers for reducing fuel consumption
EP2554647A4 (en) 2010-04-02 2013-10-09 Idemitsu Kosan Co LUBRICANT COMPOSITION FOR A COMBUSTION ENGINE
JP6711512B2 (ja) 2016-02-24 2020-06-17 出光興産株式会社 潤滑油組成物、及び当該潤滑油組成物の製造方法

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JP2017508053A (ja) * 2014-03-19 2017-03-23 ザ ルブリゾル コーポレイションＴｈｅ Ｌｕｂｒｉｚｏｌ Ｃｏｒｐｏｒａｔｉｏｎ ポリマーのブレンドを含有する潤滑剤
WO2016043333A1 (ja) * 2014-09-19 2016-03-24 出光興産株式会社 潤滑油組成物、及び当該潤滑油組成物の製造方法
JP2019094473A (ja) * 2017-11-28 2019-06-20 出光興産株式会社 潤滑油組成物
JP2019178296A (ja) * 2018-03-30 2019-10-17 出光興産株式会社 潤滑油組成物、及び潤滑油組成物の使用方法

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