WO2022250017A1 - Lubricant composition for internal combustion engine - Google Patents

Lubricant composition for internal combustion engine Download PDF

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Publication number
WO2022250017A1
WO2022250017A1 PCT/JP2022/021114 JP2022021114W WO2022250017A1 WO 2022250017 A1 WO2022250017 A1 WO 2022250017A1 JP 2022021114 W JP2022021114 W JP 2022021114W WO 2022250017 A1 WO2022250017 A1 WO 2022250017A1
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WO
WIPO (PCT)
Prior art keywords
mass
less
lubricating oil
oil composition
internal combustion
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PCT/JP2022/021114
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French (fr)
Japanese (ja)
Inventor
麻里 飯野
秀雄 常岡
Original Assignee
Ｅｎｅｏｓ株式会社
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Application filed by Ｅｎｅｏｓ株式会社 filed Critical Ｅｎｅｏｓ株式会社
Priority to CN202280035615.0A priority Critical patent/CN117321180A/en
Publication of WO2022250017A1 publication Critical patent/WO2022250017A1/en

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Classifications

    • 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
    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/26—Carboxylic acids; Salts thereof
    • C10M129/48—Carboxylic acids; Salts thereof having carboxyl groups bound to a carbon atom of a six-membered aromatic ring
    • C10M129/54—Carboxylic acids; Salts thereof having carboxyl groups bound to a carbon atom of a six-membered aromatic ring containing hydroxy groups
    • 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
    • C10M159/00—Lubricating compositions characterised by the additive being of unknown or incompletely defined constitution
    • C10M159/12—Reaction products
    • C10M159/20—Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products
    • C10M159/22—Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products containing phenol radicals
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
    • C10M171/02—Specified values of viscosity or 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
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/04—Groups 2 or 12
    • 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
    • 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

Definitions

  • the present invention relates to a lubricating oil composition for internal combustion engines. More particularly, it relates to a lubricating oil composition for internal combustion engines which is excellent in fuel saving performance.
  • the present inventors have diligently studied lubricating oil compositions for internal combustion engines that have fuel-saving performance.
  • the inventors of the present invention have found that the above problems can be solved by adopting the following configuration, and have completed the invention.
  • the present invention has been made based on such findings, and is as follows. ⁇ 1> (A) lubricating base oil, (B) magnesium salicylate; A lubricating oil composition for an internal combustion engine comprising (C) calcium salicylate and (D) a viscosity index improver, wherein the HTHS viscosity at 150°C is 1.7 or more and 2.3 mPa s or less; A lubricating oil composition for an internal combustion engine, having an HTHS viscosity at 100°C of 4.8 mPa ⁇ s or less.
  • the total content of (B) magnesium salicylate and (C) calcium salicylate is 1400 ppm by mass or more and 2000 ppm by mass or less as a metal content based on the total amount of the composition, ⁇ 1> or ⁇ 2>, wherein the content of (B) / (content of (B) + content of (C)) is 0.05 or more and 0.95 or less on a mass ppm basis
  • the lubricating oil composition for internal combustion engines according to any one of ⁇ 1> to ⁇ 3>, which has an HTHS viscosity of 4.2 mPa ⁇ s or less at 100°C.
  • the lubricating oil composition for an internal combustion engine of the present invention it is possible to provide a lubricating oil composition for an internal combustion engine having good fuel economy performance.
  • Lubricating base oil In the lubricating oil composition of the present invention, it is preferable to use a mineral base oil as the lubricating base oil.
  • Mineral base oils used in the lubricating oil composition of the present invention include distillates obtained by atmospheric distillation of crude oil. Alternatively, a lubricating oil fraction obtained by further refining the distillate obtained by vacuum distillation of this distillate by various refining processes can also be used. As the refining process, hydrorefining, solvent extraction, solvent dewaxing, hydrodewaxing, sulfuric acid washing, clay treatment, and the like can be appropriately combined.
  • a lubricating base oil that can be used in the present invention can be obtained by combining these refining processes in an appropriate order. Mixtures of refined oils with different properties obtained by subjecting different crude oils or distillates to different combinations of refining processes can also be used.
  • API Group III base oils are mineral base oils having a sulfur content of 0.03 wt.% or less, a saturates content of 90 wt.% or more, and a viscosity index of 120 or more. Multiple types of Group III base oils may be used, or only one type may be used.
  • the lubricating oil composition of the present invention may contain only a mineral base oil as the lubricating base oil, or may contain other lubricating base oils.
  • the content of the mineral base oil is based on the lubricating base oil, for example, 50% by mass or more, 60% by mass or more, 70% by mass or more, 80% by mass Above, it can be 90% by mass or more, 95% by mass or more, or 99% by mass or more.
  • a synthetic base oil may be used as the lubricating base oil in the lubricating oil composition of the present invention.
  • Synthetic base oils include poly- ⁇ -olefins and their hydrides, isobutene oligomers and their hydrides, isoparaffins, alkylbenzenes, alkylnaphthalenes, diesters (ditridecylglutarate, di-2-ethylhexyladipate, diisodecyladipate, ditridecyladipate , di-2-ethylhexyl sebacate, etc.), polyol esters (trimethylolpropane caprylate, trimethylolpropane pelargonate, pentaerythritol 2-ethylhexanoate, pentaerythritol pelargonate, etc.), polyoxyalkylene glycol, dialkyldiphenyl ether, polyphenyl ethers, mixtures thereof,
  • poly- ⁇ -olefin is preferred.
  • Poly- ⁇ -olefins typically include oligomers or co-oligomers of ⁇ -olefins having 2 to 32 carbon atoms, preferably 6 to 16 carbon atoms (1-octene oligomer, decene oligomer, ethylene-propylene co-oligomer, etc.). and their hydrogenation products.
  • the kinematic viscosity at 100° C. of the lubricating base oil contained in the lubricating oil composition of the present invention is preferably less than 4.2 mm 2 /s.
  • the kinematic viscosity at 100° C. of the lubricating base oil of the present invention is preferably 2.5 mm 2 /s or higher, more preferably 3.0 mm 2 /s or higher, still more preferably 3.4 mm 2 /s or higher.
  • the upper limit is more preferably 4.1 mm 2 /s or less, still more preferably 4.0 mm 2 /s or less.
  • a specific range is preferably 2.5 mm 2 /s or more and 4.1 mm 2 /s or less, more preferably 3.0 mm 2 /s or more and 4.0 mm 2 /s or less, still more preferably 3.4 mm 2 / s. s or more and 4.0 mm 2 /s or less.
  • the kinematic viscosity at 100° C. of the lubricating base oil is less than 4.2 mm 2 /s, more sufficient fuel saving performance can be obtained.
  • kinematic viscosity at 100° C. means the kinematic viscosity in a state in which all the lubricating base oils are mixed, that is, the kinematic viscosity of the base oil as a whole. That is, it does not mean the kinematic viscosity of a specific lubricating base oil when a plurality of base oils are included.
  • kinematic viscosity at 100°C means kinematic viscosity at 100°C measured according to ASTM D-445.
  • the content of the lubricating base oil is based on the total amount of the lubricating oil composition, for example, 50% by mass or more and 95% by mass or less, preferably 60% by mass or more and 95% by mass or less, more preferably is 70% by mass or more and 95% by mass or less, more preferably 80% by mass or more and 95% by mass or less, and most preferably 85% by mass or more and 95% by mass or less.
  • [B] Magnesium Salicylate and [C] Calcium Salicylate Metallic Detergents
  • [B] magnesium salicylate and [C] calcium salicylate are used as metallic detergents.
  • other metallic detergents may be included, but preferably include only two types, magnesium salicylate and calcium salicylate.
  • magnesium salicylate examples include compounds represented by the following formula (1).
  • the magnesium salicylate may be carbonate overbased or borate overbased.
  • the content of magnesium salicylate contained in the lubricating oil composition of the present invention is 0.01% by mass or more, preferably 0.05% by mass or more, more preferably 0.1% by mass or more, based on the total amount of the lubricating oil composition. More preferably, it is 0.15% by mass or more.
  • the upper limit is 10% by mass or less, preferably 8% by mass or less, more preferably 5% by mass or less, and even more preferably 2% by mass or less.
  • a specific range is 0.01% by mass or more and 10% by mass or less, preferably 0.05% by mass or more and 8% by mass or less, more preferably 0.1% by mass or more and 5% by mass or less, and still more preferably 0.1% by mass or more and 5% by mass or less. It is 15 mass % or more and 2 mass % or less.
  • the amount of magnesium derived from magnesium salicylate contained in the lubricating oil composition of the present invention is preferably 50 ppm by mass or more, more preferably 100 ppm by mass or more, based on the total amount of the lubricating oil composition.
  • the upper limit is preferably 2000 mass ppm or less, more preferably 1000 mass ppm or less.
  • a specific range is preferably 50 mass ppm or more and 2000 mass ppm or less, more preferably 100 mass ppm or more and 1000 mass ppm or less.
  • the magnesium salicylate contained in the lubricating oil composition of the present invention preferably has a base number of 140 mgKOH/g or more, more preferably 180 mgKOH/g or more, and still more preferably 200 mgKOH/g or more.
  • the upper limit is preferably 500 mgKOH/g or less, more preferably 400 mgKOH/g or less, still more preferably 350 mgKOH/g or less.
  • a specific range is preferably 140 mgKOH/g or more and 500 mgKOH/g or less, more preferably 180 mgKOH/g or more and 400 mgKOH/g or less, and still more preferably 200 mgKOH/g or more and 350 mgKOH/g or less.
  • the base number is a value measured according to JIS K 2501 5.2.3.
  • Examples of calcium salicylate include compounds represented by the following formula (2).
  • each R 2 independently represents an alkyl or alkenyl group having 14 to 30 carbon atoms, and n represents 1 or 2.
  • the calcium salicylate may be carbonate overbased or borate overbased.
  • the content of calcium salicylate contained in the lubricating oil composition of the present invention is 0.1% by mass or more, preferably 0.2% by mass or more, more preferably 0.3% by mass or more, based on the total amount of the lubricating oil composition. More preferably, it is 0.5% by mass or more.
  • the upper limit is 10% by mass or less, preferably 8% by mass or less, more preferably 5% by mass or less, and even more preferably 4% by mass or less.
  • a specific range is 0.1% by mass or more and 10% by mass or less, preferably 0.2% by mass or more and 8% by mass or less, more preferably 0.3% by mass or more and 5% by mass or less, and still more preferably 0.3% by mass or more and 5% by mass or less. It is 5 mass % or more and 4 mass % or less.
  • the amount of calcium derived from calcium salicylate contained in the lubricating oil composition of the present invention is preferably 300 mass ppm or more, more preferably 500 mass ppm or more, based on the total amount of the lubricating oil composition.
  • the upper limit is preferably 2500 mass ppm or less, more preferably 2000 mass ppm or less.
  • a specific range is preferably 300 mass ppm or more and 2500 mass ppm or less, more preferably 500 mass ppm or more and 2000 mass ppm or less.
  • the magnesium salicylate contained in the lubricating oil composition of the present invention preferably has a base number of 140 mgKOH/g or more, more preferably 180 mgKOH/g or more, and still more preferably 200 mgKOH/g or more.
  • the upper limit is preferably 500 mgKOH/g or less, more preferably 400 mgKOH/g or less, still more preferably 300 mgKOH/g or less.
  • a specific range is preferably 140 mgKOH/g or more and 500 mgKOH/g or less, more preferably 180 mgKOH/g or more and 400 mgKOH/g or less, and still more preferably 200 mgKOH/g or more and 300 mgKOH/g or less.
  • the lubricating oil composition of the present invention may contain metal-based detergents other than calcium salicylate and magnesium salicylate, such as phenate-based detergents and sulfonate-based detergents, within the range that does not impair the effects of the present invention. It preferably contains only two salicylates and magnesium salicylates.
  • the total content of calcium salicylate and magnesium salicylate is preferably 800 mass ppm or more, more preferably 1000 mass ppm or more, further preferably 1200 mass ppm or more, as a metal content based on the total amount of the composition. It is at least 1400 ppm by mass, most preferably at least 1400 ppm by mass.
  • the upper limit is preferably 3000 mass ppm or less, more preferably 2500 mass ppm or less, even more preferably 2200 mass ppm or less, most preferably 2000 mass ppm or less.
  • a specific range is preferably 800 mass ppm or more and 3000 mass ppm or less, more preferably 1000 mass ppm or more and 2500 mass ppm or less, still more preferably 1200 mass ppm or more and 2200 mass ppm or less, most preferably 1400 mass ppm or more and 2000 mass ppm or more. Mass ppm or less.
  • the ratio of the content of (B) magnesium salicylate to the total content of (B) magnesium salicylate and (C) magnesium salicylate is preferably 0.05 or more and 0.95 or less, more preferably 0.05 or more and 0.75 or less, and still more preferably 0.05 or more and 0.95 or less, more preferably 0.05 or more and 0.75 or less. 05 or more and 0.50 or less.
  • the ratio is within the above range, the fuel saving performance is further improved.
  • the lubricating oil composition of the present invention contains a viscosity index improver.
  • a viscosity index improver those commonly used in the field of lubricating oil compositions for internal combustion engines can be used. Specifically, polymethacrylates, olefin copolymers, polybutene, polyisobutene, polyisobutylene, polystyrene, ethylene-propylene copolymers, styrene-diene copolymers and hydrogenated products thereof can be used. Polymethacrylate is preferred.
  • the weight average molecular weight of the viscosity index improver contained in the lubricating oil composition of the present invention is preferably 10,000 or more, more preferably 100,000 or more, and still more preferably 200,000 or more.
  • the upper limit is preferably 1,000,000 or less, more preferably 800,000 or less, even more preferably 600,000 or less.
  • a specific range is preferably 10,000 or more and 1,000,000 or less, more preferably 100,000 or more and 800,000 or less, and still more preferably 200,000 or more and 600,000 or less.
  • the weight average molecular weight of a high molecular weight polymer means a value (molecular weight obtained by polystyrene conversion) determined by gel permeation chromatography (GPC).
  • the content of the viscosity index improver contained in the lubricating oil composition of the present invention is such that the HTHS viscosity of the lubricating oil composition at 150°C is 1.7 or more and 2.3 mPa s or less, and the HTHS viscosity at 100°C is , 4.8 mPa ⁇ s or less.
  • the content of the viscosity index improver contained in the lubricating oil composition of the present invention is 0.1% by mass or more, preferably 0.2% by mass or more, more preferably 0.3% by mass based on the total amount of the lubricating oil composition. Above, more preferably 0.5% by mass or more.
  • the upper limit is 10% by mass or less, preferably 8% by mass or less, more preferably 5% by mass or less, and even more preferably 4% by mass or less.
  • a specific range is 0.1% by mass or more and 10% by mass or less, preferably 0.2% by mass or more and 8% by mass or less, more preferably 0.3% by mass or more and 5% by mass or less, and still more preferably 0.3% by mass or more and 5% by mass or less. It is 5 mass % or more and 4 mass % or less.
  • the lubricating oil composition of the present invention preferably further contains (E) a molybdenum-based friction modifier as a friction modifier.
  • a molybdenum-based friction modifier as a friction modifier.
  • MoDTC molybdenum dithiocarbamate
  • MoDTC for example, a compound represented by the following formula (3) can be used.
  • R 3 to R 6 may be the same or different, and are alkyl groups having 2 to 24 carbon atoms or (alkyl)aryl groups having 6 to 24 carbon atoms, preferably 4 to 4 carbon atoms. 13 alkyl groups or (alkyl)aryl groups having 10 to 15 carbon atoms.
  • the alkyl group may be a primary alkyl group, secondary alkyl group or tertiary alkyl group, and may be linear or branched.
  • “(alkyl)aryl group” means "aryl group or alkylaryl group". In the alkylaryl group, the substitution position of the alkyl group on the aromatic ring is arbitrary.
  • X 1 to X 4 are each independently a sulfur atom or an oxygen atom, and at least one of X 1 to X 4 is a sulfur atom.
  • Molybdenum-based friction modifiers other than MoDTC include, for example, molybdenum dithiophosphate, molybdenum oxide, molybdic acid, molybdates such as ammonium salts, molybdenum disulfide, molybdenum sulfide, molybdenum sulfide, organic molybdenum compounds containing sulfur, and the like. can be mentioned.
  • the lubricating oil composition of the present invention contains a molybdenum-based friction modifier
  • its content is 0.01% by mass or more, preferably 0.1% by mass or more, more preferably 0, based on the total amount of the lubricating oil composition. 0.2% by mass or more, more preferably 0.5% by mass or more.
  • the upper limit is 10% by mass or less, preferably 8% by mass or less, more preferably 5% by mass or less, and even more preferably 2% by mass or less.
  • a specific range is 0.01% by mass to 10% by mass, preferably 0.1% by mass to 8% by mass, more preferably 0.5% by mass to 5% by mass, and still more preferably 0.5% by mass to 8% by mass. It is 5 mass % or more and 2 mass % or less.
  • the amount of molybdenum derived from the molybdenum-based friction modifier contained in the lubricating oil composition of the present invention is preferably 100 ppm by mass or more, more preferably 500 ppm by mass or more, based on the total amount of the lubricating oil composition.
  • the upper limit is preferably 2000 mass ppm or less, more preferably 1000 mass ppm or less.
  • a specific range is preferably 100 mass ppm or more and 2000 mass ppm or less, more preferably 500 mass ppm or more and 1000 mass ppm or less.
  • the lubricating oil composition of the present invention may further contain antiwear agents, antioxidants or dispersants.
  • zinc dialkyldithiophosphate As an antiwear agent, it is preferable to add zinc dialkyldithiophosphate (ZnDTP).
  • ZnDTP zinc dialkyldithiophosphate
  • Examples of zinc dialkyldithiophosphates include compounds represented by the following general formula (4).
  • R 7 to R 10 in the general formula (4) each independently represent a hydrogen atom or a linear or branched alkyl group having 1 to 24 carbon atoms, and at least one of R 7 to R 10 One is a linear or branched alkyl group having 1 to 24 carbon atoms.
  • the alkyl group can be primary, secondary or tertiary.
  • one of these zinc dialkyldithiophosphates may be used alone, or two or more thereof may be used in combination.
  • the zinc dialkyldithiophosphate is preferably a zinc dithiophosphate having a primary alkyl group (primary ZnDTP) or a zinc dithiophosphate having a secondary alkyl group (secondary ZnDTP).
  • a material containing zinc dithiophosphate as a main component is preferable because it enhances wear resistance.
  • the lubricating oil composition of the present invention contains zinc dialkyldithiophosphate
  • its content is 0.01% by mass or more, preferably 0.1% by mass or more, more preferably 0.1% by mass or more, based on the total amount of the lubricating oil composition. It is 2% by mass or more, more preferably 0.5% by mass or more.
  • the upper limit is 10% by mass or less, preferably 8% by mass or less, more preferably 5% by mass or less, and even more preferably 2% by mass or less.
  • a specific range is 0.01% by mass to 10% by mass, preferably 0.1% by mass to 8% by mass, more preferably 0.5% by mass to 5% by mass, and still more preferably 0.5% by mass to 8% by mass. It is 5 mass % or more and 2 mass % or less.
  • the amount of phosphorus derived from zinc dialkyldithiophosphate contained in the lubricating oil composition of the present invention is preferably 100 ppm by mass or more, more preferably 500 ppm by mass or more, based on the total amount of the composition.
  • the upper limit is preferably 2000 mass ppm or less, more preferably 1000 mass ppm or less.
  • a specific range is preferably 100 mass ppm or more and 2000 mass ppm or less, more preferably 500 mass ppm or more and 1000 mass ppm or less.
  • antioxidants such as phenol antioxidants and amine antioxidants can be used.
  • examples include aminic antioxidants such as alkylated diphenylamine, phenyl- ⁇ -naphthylamine, alkylated- ⁇ -naphthylamine, 2,6-di-t-butyl-4-methylphenol, 4,4′-methylenebis( 2,6-di-t-butylphenol) and other phenolic antioxidants.
  • the lubricating oil composition contains an antioxidant, its content is usually 5.0% by mass or less, preferably 3.0% by mass or less, and preferably 0, based on the total amount of the lubricating oil composition. .1% by mass or more, more preferably 0.5% by mass or more.
  • Dispersants include ashless dispersants such as succinimide or benzylamine.
  • ashless dispersants such as succinimide or benzylamine.
  • its content is usually 5.0% by mass or less, preferably 0.1% by mass or more, based on the total amount of the lubricating oil composition.
  • the lubricating oil composition of the present invention can contain other additives commonly used in lubricating oils depending on the purpose in order to further improve its performance.
  • additives include additives such as wear inhibitors or extreme pressure agents, pour point depressants, corrosion inhibitors, rust inhibitors, metal deactivators, antifoaming agents, and the like.
  • the HTHS viscosity at 150°C of the lubricating oil composition of the present invention is 1.7 or more and 2.3 mPa ⁇ s or less.
  • the HTHS viscosity at 150°C is 2.3 mPa ⁇ s or less, good fuel economy performance can be obtained. If it is less than 1.7 mPa ⁇ s, lubricity may be insufficient.
  • the lubricating oil composition of the present invention is more preferably 1.7 mPa s or more and 2.2 mPa s or less, more preferably 1.7 mPa s or more and 2.1 mPa s or less, still more preferably It is 1.7 mPa ⁇ s or more and 2.0 mPa ⁇ s or less.
  • the HTHS viscosity at 150°C indicates the high temperature high shear viscosity at 150°C defined in ASTM D4683.
  • the HTHS viscosity at 100° C. of the lubricating oil composition of the present invention is 4.8 mPa ⁇ s or less. If the HTHS viscosity at 100° C. exceeds 4.8 mPa ⁇ s, there is a possibility that sufficient fuel saving performance cannot be obtained.
  • the HTHS viscosity at 100° C. of the lubricating oil composition of the present invention is preferably 3.0 mPa s or more and 4.5 mPa s or less, more preferably 3.2 mPa s or more and 4.2 mPa s or less, still more preferably 3 .4 mPa ⁇ s or more and 4.0 mPa ⁇ s or less.
  • the HTHS viscosity at 100°C indicates the high temperature high shear viscosity at 100°C specified in ASTM D4683.
  • the HTHS viscosity (100°C)/HTHS viscosity (150°C) is preferably 1.95 or more and less than 2.20, more preferably 2.00 or more and less than 2.20.
  • the viscosity index of the lubricating oil composition of the present invention is preferably 140 or more and 240 or less, more preferably 140 or more and 220 or less.
  • the viscosity index of the lubricating oil composition is 140 or more, fuel economy performance can be improved while maintaining a low HTHS viscosity at 150°C.
  • the viscosity index of the lubricating oil composition exceeds 240, the evaporability may deteriorate.
  • the viscosity index means a viscosity index measured according to JIS K 2283-1993.
  • the kinematic viscosity at 40° C. of the lubricating oil composition of the present invention is preferably 10 mm 2 /s or more, more preferably 14 mm 2 /s or more, still more preferably 16 mm 2 /s or more, most preferably 18 mmmm 2 /s or more.
  • the upper limit is preferably 30 mm 2 /s or less, more preferably 28 mm 2 /s or less, even more preferably 26 mm 2 /s or less, most preferably 25 mm 2 /s or less.
  • a specific range is preferably 10 mm 2 /s or more and 30 mm 2 /s or less, more preferably 14 mm 2 /s or more and 28 mm 2 /s or less, still more preferably 16 mm 2 /s or more and 26 mm 2 /s or less, most preferably is 18 mm 2 /s or more and 25 mm 2 /s or less.
  • the kinematic viscosity at 40° C. of the lubricating oil composition is 30 mm 2 /s or less, sufficient fuel saving performance can be obtained.
  • kinematic viscosity at 40°C means kinematic viscosity at 40°C measured according to ASTM D-445.
  • the kinematic viscosity at 100° C. of the lubricating oil composition of the present invention is preferably 3 mm 2 /s or more, more preferably 4 mm 2 /s or more.
  • the upper limit is preferably 7 mm 2 /s or less, more preferably 6 mm 2 /s or less.
  • a specific range is preferably 3 mm 2 /s or more and 7 mm 2 /s or less, more preferably 4 mm 2 /s or more and 6 mm 2 /s or less.
  • the density ( ⁇ 15) at 15°C of the lubricating oil composition of the present invention is preferably 0.860 or less, more preferably 0.850 or less.
  • the density at 15°C means the density measured at 15°C according to JIS K 2249-1995.
  • the NOACK evaporation at 250°C is preferably 30% by mass or less. If the NOACK evaporation amount of the lubricating base oil component exceeds 30% by mass, the evaporation loss of the lubricating oil is large, which causes an increase in viscosity and the like, which is not preferable.
  • the NOACK evaporation amount is the evaporation amount of lubricating oil measured according to ASTM D5800.
  • the lower limit of the NOACK evaporation amount of the lubricating oil composition at 250° C. is not particularly limited, but is usually 5% by mass or more.
  • Lubricating oil compositions for testing were prepared by blending base oils and additives at the blending ratios shown in Tables 1 and 2 for each example and each comparative example. The following evaluations were performed on the obtained lubricating oil composition for test. Evaluation results are shown in Tables 1 and 2.
  • Lubricating base oil / base oil 1 Group III base oil (mineral oil) Kinematic viscosity 3.3 mm 2 /s (100 ° C.), viscosity index 112 ⁇ Base oil 2: Group III base oil (mineral oil) kinematic viscosity 4.3 mm 2 /s (100°C), viscosity index 123 Lubricating base oils were prepared by mixing base oils at the mass ratios shown in Tables 1 and 2. In the table, the numerical value of the base oil represents the mass ratio based on the total amount of the base oil.
  • Anti-wear agent 1 zinc dialkyldithiophosphate (zinc content 9.3% by mass, phosphorus content 9.3% by mass, sulfur content 17.6% by mass, secondary ZnDTP) - Dispersant 1: Polyimide succinate (nitrogen content 1.75% by mass) ⁇ Antioxidant 1: amine antioxidant ⁇ Antioxidant 2: phenolic antioxidant
  • each test lubricating oil composition is shown in Tables 1 and 2 below.
  • the density at 15° C. of each test lubricating oil composition of Examples 1 to 8 and Comparative Example 1 is all 0.850 or less.
  • Examples 1 to 8 torque was reduced compared to Comparative Example 1 under all conditions of 1000 rpm, 2000 rpm and 3000 rpm. Therefore, Examples 1 to 8 are superior to Comparative Example 1 in fuel saving performance.
  • the lubricating oil composition for an internal combustion engine of the present invention it is possible to provide a lubricating oil composition for an internal combustion engine that exhibits good fuel economy performance.

Abstract

This lubricant composition for an internal combustion engine comprises (A) a lubricating base oil, (B) magnesium salicylate, (C) calcium salicylate, and (D) a viscosity index improver, said lubricant composition having an HTHS viscosity at 150°C of 1.7-2.3 mPa·s and an HTHS viscosity at 100°C of 4.8 mPa·s or less. Thus, it is possible to provide a lubricant composition for an internal combustion engine that has good fuel-saving performance.

Description

内燃機関用潤滑油組成物Lubricating oil composition for internal combustion engine
　本発明は、内燃機関用潤滑油組成物に関する。詳細には、省燃費性能に優れた内燃機関用潤滑油組成物に関する。 The present invention relates to a lubricating oil composition for internal combustion engines. More particularly, it relates to a lubricating oil composition for internal combustion engines which is excellent in fuel saving performance.
　内燃機関は最近のＣＯ２排出量規制などの環境対策のため、さらに省燃費性能を向上させることが求められている。
　潤滑油による燃費改善には、使用粘度の低減による粘性抵抗を下げることが行われてきた（例えば、特許文献１を参照。）。しかし内燃機関の潤滑には必要な粘度が存在し、おのずと限界がある。また内燃機関油はバルブの駆動などの油圧源としても使用されており、油圧の維持には一定の粘度が必要である。このため、低粘度化にも限界があった。これを打開するため、内燃機関のヒートマネージメントが導入されつつある。例えば、内燃機関の使用目的や使用条件により内燃機関油の最高使用温度を低くすることや、内燃機関ポンプの改良によりポンプに必要な油圧を小さくすることで、必要粘度をさらに低減することが可能となる。これにより一段の省燃費化を図ることができる。 Due to recent environmental measures such as CO2 emission regulations, internal combustion engines are required to further improve fuel efficiency.
In order to improve fuel efficiency with lubricating oil, viscous resistance has been lowered by reducing the viscosity used (see, for example, Patent Document 1). However, lubrication of an internal combustion engine has a necessary viscosity, and naturally there is a limit. Internal combustion engine oil is also used as a hydraulic source for driving valves, etc., and a certain viscosity is required to maintain the hydraulic pressure. For this reason, there is a limit to lowering the viscosity. To overcome this problem, heat management of internal combustion engines is being introduced. For example, it is possible to further reduce the necessary viscosity by lowering the maximum operating temperature of the internal combustion engine oil according to the purpose and conditions of use of the internal combustion engine, and by reducing the hydraulic pressure required for the pump by improving the internal combustion engine pump. becomes. As a result, fuel consumption can be further reduced.
特開第２０１０－３１０８２号公報Japanese Patent Application Laid-Open No. 2010-31082 国際公開第２０１４／０１０４６２号パンフレットWO 2014/010462 Pamphlet
　ヒートマネージメントを取り入れた内燃機関において、省燃費性能の改善を目的とした内燃機関用潤滑油も開発されている（特許文献２）。しかしながら、さらなる省燃費性の改善が望まれていた。 In internal combustion engines incorporating heat management, lubricating oils for internal combustion engines have also been developed for the purpose of improving fuel efficiency (Patent Document 2). However, further improvement in fuel efficiency has been desired.
　本発明者らは、省燃費性能を具備する内燃機関用潤滑油組成物について、鋭意検討した。そして、本発明者らは、以下の構成を採用することによって、前記課題を解決できることを見出し、発明を完成するに至った。 The present inventors have diligently studied lubricating oil compositions for internal combustion engines that have fuel-saving performance. The inventors of the present invention have found that the above problems can be solved by adopting the following configuration, and have completed the invention.
　本発明は、かかる知見に基づきなされたもので、次の通りのものである。
＜１＞
　（Ａ）潤滑油基油、
　（Ｂ）マグネシウムサリシレート、
　（Ｃ）カルシウムサリシレート、および
　（Ｄ）粘度指数向上剤、を含む内燃機関用潤滑油組成物であって、１５０℃のＨＴＨＳ粘度が、１．７以上２．３ｍＰａ・ｓ以下であり、
１００℃のＨＴＨＳ粘度が、４．８ｍＰａ・ｓ以下である内燃機関用潤滑油組成物。
＜２＞
　（Ａ）潤滑油基油の１００℃における動粘度が４．２ｍｍ２／ｓ未満であり、潤滑油組成物の粘度指数が１４０以上である、＜１＞に記載の内燃機関用潤滑油組成物。
＜３＞
　前記（Ｂ）マグネシウムサリシレートおよび（Ｃ）カルシウムサリシレートの含有量の合計が、組成物全量基準で、金属量として１４００質量ｐｐｍ以上２０００質量ｐｐｍ以下であり、
（Ｂ）の含有量／（（Ｂ）の含有量＋（Ｃ）の含有量）が、質量ｐｐｍ基準で、０．０５以上０．９５以下である、＜１＞または＜２＞に記載の内燃機関用潤滑油組成物。
＜４＞
　１５０℃のＨＴＨＳ粘度が、１．７以上２．０ｍＰａ・ｓ以下であり、
１００℃のＨＴＨＳ粘度が、４．２ｍＰａ・ｓ以下である、＜１＞～＜３＞のいずれかに記載の内燃機関用潤滑油組成物。 The present invention has been made based on such findings, and is as follows.
<1>
(A) lubricating base oil,
(B) magnesium salicylate;
A lubricating oil composition for an internal combustion engine comprising (C) calcium salicylate and (D) a viscosity index improver, wherein the HTHS viscosity at 150°C is 1.7 or more and 2.3 mPa s or less;
A lubricating oil composition for an internal combustion engine, having an HTHS viscosity at 100°C of 4.8 mPa·s or less.
<2>
(A) The lubricating oil composition for internal combustion engines according to <1>, wherein the kinematic viscosity of the lubricating base oil at 100°C is less than 4.2 mm 2 /s, and the viscosity index of the lubricating oil composition is 140 or more. .
<3>
The total content of (B) magnesium salicylate and (C) calcium salicylate is 1400 ppm by mass or more and 2000 ppm by mass or less as a metal content based on the total amount of the composition,
<1> or <2>, wherein the content of (B) / (content of (B) + content of (C)) is 0.05 or more and 0.95 or less on a mass ppm basis A lubricating oil composition for an internal combustion engine.
<4>
HTHS viscosity at 150 ° C. is 1.7 or more and 2.0 mPa s or less,
The lubricating oil composition for internal combustion engines according to any one of <1> to <3>, which has an HTHS viscosity of 4.2 mPa·s or less at 100°C.
　本発明の内燃機関用潤滑油組成物によれば、良好な省燃費性能を具備する内燃機関用潤滑油組成物を提供することができる。 According to the lubricating oil composition for an internal combustion engine of the present invention, it is possible to provide a lubricating oil composition for an internal combustion engine having good fuel economy performance.
〔Ａ〕潤滑油基油
　本発明の潤滑油組成物においては、潤滑油基油として鉱油系基油を用いることが好ましい。本発明の潤滑油組成物に用いられる鉱油系基油としては、原油を常圧蒸留して得られる留出油が挙げられる。または、この留出油をさらに減圧蒸留して得られる留出油を、各種の精製プロセスで精製した潤滑油留分も使用することができる。精製プロセスとしては、水素化精製、溶剤抽出、溶剤脱ろう、水素化脱ろう、硫酸洗浄、白土処理などを、適宜組み合わせることができる。これらの精製プロセスを適宜の順序で組み合わせて処理することにより、本発明で使用できる潤滑油基油を得ることができる。異なる原油あるいは留出油を異なる精製プロセスの組合せに供することにより得られた、性状の異なる複数の精製油の混合物も使用可能である。 [A] Lubricating base oil In the lubricating oil composition of the present invention, it is preferable to use a mineral base oil as the lubricating base oil. Mineral base oils used in the lubricating oil composition of the present invention include distillates obtained by atmospheric distillation of crude oil. Alternatively, a lubricating oil fraction obtained by further refining the distillate obtained by vacuum distillation of this distillate by various refining processes can also be used. As the refining process, hydrorefining, solvent extraction, solvent dewaxing, hydrodewaxing, sulfuric acid washing, clay treatment, and the like can be appropriately combined. A lubricating base oil that can be used in the present invention can be obtained by combining these refining processes in an appropriate order. Mixtures of refined oils with different properties obtained by subjecting different crude oils or distillates to different combinations of refining processes can also be used.
　本発明の潤滑油組成物に用いられる鉱油系基油としては、ＡＰＩ分類におけるグループＩＩＩ基油に属するものを用いることが好ましい。ＡＰＩグループＩＩＩ基油は、硫黄分が０．０３質量％以下、飽和分が９０質量％以上、且つ粘度指数が１２０以上の鉱油系基油である。複数の種類のグループＩＩＩ基油を用いてもよく、一種のみを用いてもよい。 As the mineral base oil used in the lubricating oil composition of the present invention, it is preferable to use one belonging to Group III base oil in the API classification. API Group III base oils are mineral base oils having a sulfur content of 0.03 wt.% or less, a saturates content of 90 wt.% or more, and a viscosity index of 120 or more. Multiple types of Group III base oils may be used, or only one type may be used.
　本発明の潤滑油組成物においては、潤滑油基油として鉱油系基油のみを含むこともでき、その他の潤滑油基油を含むこともできる。具体的には、本発明の潤滑油組成物において、鉱油系基油の含有量は、潤滑油基油基準で、例えば、５０質量％以上、６０質量％以上、７０質量％以上、８０質量％以上、９０質量％以上、９５質量％以上、または９９質量％以上であることができる。 The lubricating oil composition of the present invention may contain only a mineral base oil as the lubricating base oil, or may contain other lubricating base oils. Specifically, in the lubricating oil composition of the present invention, the content of the mineral base oil is based on the lubricating base oil, for example, 50% by mass or more, 60% by mass or more, 70% by mass or more, 80% by mass Above, it can be 90% by mass or more, 95% by mass or more, or 99% by mass or more.
　本発明の潤滑油組成物においては、潤滑油基油として合成系基油を用いてもよい。合成系基油としては、ポリα－オレフィンおよびその水素化物、イソブテンオリゴマーおよびその水素化物、イソパラフィン、アルキルベンゼン、アルキルナフタレン、ジエステル（ジトリデシルグルタレート、ジ－２－エチルヘキシルアジペート、ジイソデシルアジペート、ジトリデシルアジペート、ジ－２－エチルヘキシルセバケート等）、ポリオールエステル（トリメチロールプロパンカプリレート、トリメチロールプロパンペラルゴネート、ペンタエリスリトール２－エチルヘキサノエート、ペンタエリスリトールペラルゴネート等）、ポリオキシアルキレングリコール、ジアルキルジフェニルエーテル、ポリフェニルエーテル、並びにこれらの混合物等が挙げられる。中でも、ポリα－オレフィンが好ましい。ポリα－オレフィンとしては、典型的には、炭素数２～３２、好ましくは炭素数６～１６のα－オレフィンのオリゴマーまたはコオリゴマー（１－オクテンオリゴマー、デセンオリゴマー、エチレン－プロピレンコオリゴマー等）およびそれらの水素化生成物が挙げられる。 A synthetic base oil may be used as the lubricating base oil in the lubricating oil composition of the present invention. Synthetic base oils include poly-α-olefins and their hydrides, isobutene oligomers and their hydrides, isoparaffins, alkylbenzenes, alkylnaphthalenes, diesters (ditridecylglutarate, di-2-ethylhexyladipate, diisodecyladipate, ditridecyladipate , di-2-ethylhexyl sebacate, etc.), polyol esters (trimethylolpropane caprylate, trimethylolpropane pelargonate, pentaerythritol 2-ethylhexanoate, pentaerythritol pelargonate, etc.), polyoxyalkylene glycol, dialkyldiphenyl ether, polyphenyl ethers, mixtures thereof, and the like. Among them, poly-α-olefin is preferred. Poly-α-olefins typically include oligomers or co-oligomers of α-olefins having 2 to 32 carbon atoms, preferably 6 to 16 carbon atoms (1-octene oligomer, decene oligomer, ethylene-propylene co-oligomer, etc.). and their hydrogenation products.
　本発明の潤滑油組成物に含まれる潤滑油基油の１００℃における動粘度は、４．２ｍｍ２／ｓ未満が好ましい。本発明の潤滑油基油の１００℃における動粘度は、好ましくは２．５ｍｍ２／ｓ以上、より好ましくは３．０ｍｍ２／ｓ以上、さらに好ましくは３．４ｍｍ２／ｓ以上である。また、上限は、より好ましくは４．１ｍｍ２／ｓ以下、さらに好ましくは４．０ｍｍ２／ｓ以下である。具体的な範囲としては、好ましくは２．５ｍｍ２／ｓ以上４．１ｍｍ２／ｓ以下、より好ましくは３．０ｍｍ２／ｓ以上４．０ｍｍ２／ｓ以下、さらに好ましくは３．４ｍｍ２／ｓ以上４．０ｍｍ２／ｓ以下である。潤滑油基油の１００℃における動粘度が４．２ｍｍ２／ｓ未満であることにより、さらに十分な省燃費性能を得ることができる。また、潤滑油基油の１００℃における動粘度が２．５ｍｍ２／ｓ以上であることにより、潤滑箇所での油膜形成を確保でき、潤滑油組成物の蒸発損失も小さくすることができる。
　前記の１００℃における動粘度は、全ての潤滑油基油を混合した状態での動粘度、すなわち、基油全体としての動粘度を意味する。すなわち、複数の基油が含まれる場合の、特定の１つの潤滑油基油の動粘度を意味するものではない。
　なお、本明細書において「１００℃における動粘度」とは、ＡＳＴＭ　Ｄ－４４５に準拠して測定された１００℃での動粘度を意味する。 The kinematic viscosity at 100° C. of the lubricating base oil contained in the lubricating oil composition of the present invention is preferably less than 4.2 mm 2 /s. The kinematic viscosity at 100° C. of the lubricating base oil of the present invention is preferably 2.5 mm 2 /s or higher, more preferably 3.0 mm 2 /s or higher, still more preferably 3.4 mm 2 /s or higher. Also, the upper limit is more preferably 4.1 mm 2 /s or less, still more preferably 4.0 mm 2 /s or less. A specific range is preferably 2.5 mm 2 /s or more and 4.1 mm 2 /s or less, more preferably 3.0 mm 2 /s or more and 4.0 mm 2 /s or less, still more preferably 3.4 mm 2 / s. s or more and 4.0 mm 2 /s or less. When the kinematic viscosity at 100° C. of the lubricating base oil is less than 4.2 mm 2 /s, more sufficient fuel saving performance can be obtained. In addition, since the kinematic viscosity at 100° C. of the lubricating base oil is 2.5 mm 2 /s or more, it is possible to ensure the formation of an oil film at the lubricating points and to reduce the evaporation loss of the lubricating oil composition.
The above kinematic viscosity at 100° C. means the kinematic viscosity in a state in which all the lubricating base oils are mixed, that is, the kinematic viscosity of the base oil as a whole. That is, it does not mean the kinematic viscosity of a specific lubricating base oil when a plurality of base oils are included.
As used herein, "kinematic viscosity at 100°C" means kinematic viscosity at 100°C measured according to ASTM D-445.
　本発明の潤滑油組成物において、潤滑油基油の含有量は、潤滑油組成物全量基準で、例えば、５０質量％以上９５質量％以下、好ましくは６０質量％以上９５質量％以下、より好ましくは７０質量％以上９５質量％以下、さらに好ましくは８０質量％以上９５質量％以下、最も好ましくは８５質量％以上９５質量％以下である。 In the lubricating oil composition of the present invention, the content of the lubricating base oil is based on the total amount of the lubricating oil composition, for example, 50% by mass or more and 95% by mass or less, preferably 60% by mass or more and 95% by mass or less, more preferably is 70% by mass or more and 95% by mass or less, more preferably 80% by mass or more and 95% by mass or less, and most preferably 85% by mass or more and 95% by mass or less.
〔Ｂ〕マグネシウムサリシレートおよび〔Ｃ〕カルシウムサリシレート：金属系清浄剤
　本発明の潤滑油組成物では、金属系清浄剤として、〔Ｂ〕マグネシウムサリシレートおよび〔Ｃ〕カルシウムサリシレートを用いる。マグネシウムサリシレートおよびカルシウムサリシレートに加えて、他の金属系清浄剤を含むことができるが、マグネシウムサリシレートおよびカルシウムサリシレートの２種類のみを含むことが好ましい。 [B] Magnesium Salicylate and [C] Calcium Salicylate: Metallic Detergents In the lubricating oil composition of the present invention, [B] magnesium salicylate and [C] calcium salicylate are used as metallic detergents. In addition to magnesium salicylate and calcium salicylate, other metallic detergents may be included, but preferably include only two types, magnesium salicylate and calcium salicylate.
　マグネシウムサリシレートとしては、以下の式（１）で表される化合物を例示できる。 Examples of magnesium salicylate include compounds represented by the following formula (1).
Figure JPOXMLDOC01-appb-C000001
Figure JPOXMLDOC01-appb-C000001
　前記式（１）中、Ｒ１はそれぞれ独立に炭素数１４～３０のアルキル基またはアルケニル基を表し、ｎは１または２を表す。Ｍｇはマグネシウムを表す。ｎとしては１が好ましい。なおｎ＝２であるとき、Ｒ１は異なる基の組み合わせであってもよい。マグネシウムサリシレートは、炭酸塩で過塩基化されていてもよく、ホウ酸塩で過塩基化されていてもよい。 In formula (1), each R 1 independently represents an alkyl group or alkenyl group having 14 to 30 carbon atoms, and n represents 1 or 2; Mg represents magnesium. 1 is preferable as n. When n=2, R 1 may be a combination of different groups. The magnesium salicylate may be carbonate overbased or borate overbased.
　本発明の潤滑油組成物に含まれるマグネシウムサリシレートの含有量は、潤滑油組成物全量基準で０．０１質量％以上、好ましくは０．０５質量％以上、より好ましくは０．１質量％以上、さらに好ましくは０．１５質量％以上である。上限は、１０質量％以下、好ましくは８質量％以下、より好ましくは５質量％以下、さらに好ましくは２質量％以下である。具体的な範囲としては、０．０１質量％以上１０質量％以下、好ましくは０．０５質量％以上８質量％以下、より好ましくは０．１質量％以上５質量％以下、さらに好ましくは０．１５質量％以上２質量％以下である。 The content of magnesium salicylate contained in the lubricating oil composition of the present invention is 0.01% by mass or more, preferably 0.05% by mass or more, more preferably 0.1% by mass or more, based on the total amount of the lubricating oil composition. More preferably, it is 0.15% by mass or more. The upper limit is 10% by mass or less, preferably 8% by mass or less, more preferably 5% by mass or less, and even more preferably 2% by mass or less. A specific range is 0.01% by mass or more and 10% by mass or less, preferably 0.05% by mass or more and 8% by mass or less, more preferably 0.1% by mass or more and 5% by mass or less, and still more preferably 0.1% by mass or more and 5% by mass or less. It is 15 mass % or more and 2 mass % or less.
　本発明の潤滑油組成物に含まれるマグネシウムサリシレート由来のマグネシウムの量は、潤滑油組成物全量基準で、好ましくは５０質量ｐｐｍ以上、より好ましくは１００質量ｐｐｍ以上である。上限は、好ましくは２０００質量ｐｐｍ以下、より好ましくは１０００質量ｐｐｍ以下である。具体的な範囲としては、好ましくは５０質量ｐｐｍ以上２０００質量ｐｐｍ以下、より好ましくは１００質量ｐｐｍ以上１０００質量ｐｐｍ以下である。マグネシウムの含有量を前記範囲内にすることにより、省燃費性能を確保しながら、エンジン内部の清浄性を高く保つことができる。 The amount of magnesium derived from magnesium salicylate contained in the lubricating oil composition of the present invention is preferably 50 ppm by mass or more, more preferably 100 ppm by mass or more, based on the total amount of the lubricating oil composition. The upper limit is preferably 2000 mass ppm or less, more preferably 1000 mass ppm or less. A specific range is preferably 50 mass ppm or more and 2000 mass ppm or less, more preferably 100 mass ppm or more and 1000 mass ppm or less. By setting the content of magnesium within the above range, it is possible to maintain high cleanliness inside the engine while ensuring fuel saving performance.
（塩基価）
　本発明の潤滑油組成物に含まれるマグネシウムサリシレートの塩基価は、好ましくは１４０ｍｇＫＯＨ／ｇ以上、より好ましくは１８０ｍｇＫＯＨ／ｇ以上、さらに好ましくは２００ｍｇＫＯＨ／ｇ以上である。上限は、好ましくは５００ｍｇＫＯＨ／ｇ以下、より好ましくは４００ｍｇＫＯＨ／ｇ以下、さらに好ましくは３５０ｍｇＫＯＨ／ｇ以下である。具体的な範囲としては、好ましくは１４０ｍｇＫＯＨ／ｇ以上５００ｍｇＫＯＨ／ｇ以下、より好ましくは１８０ｍｇＫＯＨ／ｇ以上４００ｍｇＫＯＨ／ｇ以下、さらに好ましくは２００ｍｇＫＯＨ／ｇ以上３５０ｍｇＫＯＨ／ｇ以下である。
　本明細書において、塩基価は、ＪＩＳ　Ｋ　２５０１　５．２．３により測定される値である。 (base value)
The magnesium salicylate contained in the lubricating oil composition of the present invention preferably has a base number of 140 mgKOH/g or more, more preferably 180 mgKOH/g or more, and still more preferably 200 mgKOH/g or more. The upper limit is preferably 500 mgKOH/g or less, more preferably 400 mgKOH/g or less, still more preferably 350 mgKOH/g or less. A specific range is preferably 140 mgKOH/g or more and 500 mgKOH/g or less, more preferably 180 mgKOH/g or more and 400 mgKOH/g or less, and still more preferably 200 mgKOH/g or more and 350 mgKOH/g or less.
As used herein, the base number is a value measured according to JIS K 2501 5.2.3.
　カルシウムサリシレートとしては、以下の式（２）で表される化合物を例示できる。 Examples of calcium salicylate include compounds represented by the following formula (2).
Figure JPOXMLDOC01-appb-C000002
Figure JPOXMLDOC01-appb-C000002
　前記式（２）中、Ｒ２はそれぞれ独立に炭素数１４～３０のアルキル基またはアルケニル基を表し、ｎは１または２を表す。Ｃａはカルシウムを表す。ｎとしては１が好ましい。なおｎ＝２であるとき、Ｒ２は異なる基の組み合わせであってもよい。カルシウムサリシレートは、炭酸塩で過塩基化されていてもよく、ホウ酸塩で過塩基化されていてもよい。 In the above formula (2), each R 2 independently represents an alkyl or alkenyl group having 14 to 30 carbon atoms, and n represents 1 or 2. Ca represents calcium. 1 is preferable as n. When n=2, R 2 may be a combination of different groups. The calcium salicylate may be carbonate overbased or borate overbased.
　本発明の潤滑油組成物に含まれるカルシウムサリシレートの含有量は、潤滑油組成物全量基準で０．１質量％以上、好ましくは０．２質量％以上、より好ましくは０．３質量％以上、さらに好ましくは０．５質量％以上である。上限は、１０質量％以下、好ましくは８質量％以下、より好ましくは５質量％以下、さらに好ましくは４質量％以下である。具体的な範囲としては、０．１質量％以上１０質量％以下、好ましくは０．２質量％以上８質量％以下、より好ましくは０．３質量％以上５質量％以下、さらに好ましくは０．５質量％以上４質量％以下である。 The content of calcium salicylate contained in the lubricating oil composition of the present invention is 0.1% by mass or more, preferably 0.2% by mass or more, more preferably 0.3% by mass or more, based on the total amount of the lubricating oil composition. More preferably, it is 0.5% by mass or more. The upper limit is 10% by mass or less, preferably 8% by mass or less, more preferably 5% by mass or less, and even more preferably 4% by mass or less. A specific range is 0.1% by mass or more and 10% by mass or less, preferably 0.2% by mass or more and 8% by mass or less, more preferably 0.3% by mass or more and 5% by mass or less, and still more preferably 0.3% by mass or more and 5% by mass or less. It is 5 mass % or more and 4 mass % or less.
　本発明の潤滑油組成物に含まれるカルシウムサリシレート由来のカルシウムの量は、潤滑油組成物全量基準で、好ましくは３００質量ｐｐｍ以上、より好ましくは５００質量ｐｐｍ以上である。上限は、好ましくは２５００質量ｐｐｍ以下、より好ましくは２０００質量ｐｐｍ以下である。具体的な範囲としては、好ましくは３００質量ｐｐｍ以上２５００質量ｐｐｍ以下、より好ましくは５００質量ｐｐｍ以上２０００質量ｐｐｍ以下である。カルシウムの含有量を前記範囲内にすることにより、エンジン内部の清浄性を高く保つことができる。 The amount of calcium derived from calcium salicylate contained in the lubricating oil composition of the present invention is preferably 300 mass ppm or more, more preferably 500 mass ppm or more, based on the total amount of the lubricating oil composition. The upper limit is preferably 2500 mass ppm or less, more preferably 2000 mass ppm or less. A specific range is preferably 300 mass ppm or more and 2500 mass ppm or less, more preferably 500 mass ppm or more and 2000 mass ppm or less. By setting the content of calcium within the above range, it is possible to keep the inside of the engine highly clean.
（塩基価）
　本発明の潤滑油組成物に含まれるマグネシウムサリシレートの塩基価は、好ましくは１４０ｍｇＫＯＨ／ｇ以上、より好ましくは１８０ｍｇＫＯＨ／ｇ以上、さらに好ましくは２００ｍｇＫＯＨ／ｇ以上である。上限は、好ましくは５００ｍｇＫＯＨ／ｇ以下、より好ましくは４００ｍｇＫＯＨ／ｇ以下、さらに好ましくは３００ｍｇＫＯＨ／ｇ以下である。具体的な範囲としては、好ましくは１４０ｍｇＫＯＨ／ｇ以上５００ｍｇＫＯＨ／ｇ以下、より好ましくは１８０ｍｇＫＯＨ／ｇ以上４００ｍｇＫＯＨ／ｇ以下、さらに好ましくは２００ｍｇＫＯＨ／ｇ以上３００ｍｇＫＯＨ／ｇ以下である。 (base value)
The magnesium salicylate contained in the lubricating oil composition of the present invention preferably has a base number of 140 mgKOH/g or more, more preferably 180 mgKOH/g or more, and still more preferably 200 mgKOH/g or more. The upper limit is preferably 500 mgKOH/g or less, more preferably 400 mgKOH/g or less, still more preferably 300 mgKOH/g or less. A specific range is preferably 140 mgKOH/g or more and 500 mgKOH/g or less, more preferably 180 mgKOH/g or more and 400 mgKOH/g or less, and still more preferably 200 mgKOH/g or more and 300 mgKOH/g or less.
　本発明の潤滑油組成物は、本発明の効果を損なわない範囲内において、カルシウムサリシレートおよびマグネシウムサリシレート以外の金属系清浄剤、例えばフェネート系清浄剤、スルホネート系清浄剤を含むことができるが、カルシウムサリシレートおよびマグネシウムサリシレートの２種類のみを含むことが好ましい。 The lubricating oil composition of the present invention may contain metal-based detergents other than calcium salicylate and magnesium salicylate, such as phenate-based detergents and sulfonate-based detergents, within the range that does not impair the effects of the present invention. It preferably contains only two salicylates and magnesium salicylates.
　本発明の潤滑油組成物では、カルシウムサリシレートおよびマグネシウムサリシレートの含有量の合計が、組成物全量基準で、金属量として、好ましくは８００質量ｐｐｍ以上、より好ましくは１０００質量ｐｐｍ以上、さらに好ましくは１２００質量ｐｐｍ以上、最も好ましくは１４００質量ｐｐｍ以上である。上限は、好ましくは３０００質量ｐｐｍ以下、より好ましくは２５００質量ｐｐｍ以下、さらに好ましくは２２００質量ｐｐｍ以下、最も好ましくは２０００質量ｐｐｍ以下である。具体的な範囲としては、好ましくは８００質量ｐｐｍ以上３０００質量ｐｐｍ以下、より好ましくは１０００質量ｐｐｍ以上２５００質量ｐｐｍ以下、さらに好ましくは１２００質量ｐｐｍ以上２２００質量ｐｐｍ以下、最も好ましくは１４００質量ｐｐｍ以上２０００質量ｐｐｍ以下である。カルシウムサリシレートおよびマグネシウムサリシレートの含有量を前記範囲内にすることにより、省燃費性能を確保しながら、エンジン内部の清浄性を高く保つことができる。 In the lubricating oil composition of the present invention, the total content of calcium salicylate and magnesium salicylate is preferably 800 mass ppm or more, more preferably 1000 mass ppm or more, further preferably 1200 mass ppm or more, as a metal content based on the total amount of the composition. It is at least 1400 ppm by mass, most preferably at least 1400 ppm by mass. The upper limit is preferably 3000 mass ppm or less, more preferably 2500 mass ppm or less, even more preferably 2200 mass ppm or less, most preferably 2000 mass ppm or less. A specific range is preferably 800 mass ppm or more and 3000 mass ppm or less, more preferably 1000 mass ppm or more and 2500 mass ppm or less, still more preferably 1200 mass ppm or more and 2200 mass ppm or less, most preferably 1400 mass ppm or more and 2000 mass ppm or more. Mass ppm or less. By setting the contents of calcium salicylate and magnesium salicylate within the above ranges, it is possible to maintain high cleanliness inside the engine while ensuring fuel saving performance.
　本発明の潤滑油組成物では、（Ｂ）マグネシウムサリシレートの含有量の、（Ｂ）マグネシウムサリシレートおよび（Ｃ）マグネシウムサリシレートの含有量の合計に対する比率（（Ｂ）の含有量／（（Ｂ）の含有量＋（Ｃ）の含有量））が、質量ｐｐｍ基準で、好ましくは０．０５以上０．９５以下であり、より好ましくは０．０５以上０．７５以下であり、さらに好ましくは０．０５以上０．５０以下である。比率が前記の範囲内であることにより、省燃費性能がより改善される。 In the lubricating oil composition of the present invention, the ratio of the content of (B) magnesium salicylate to the total content of (B) magnesium salicylate and (C) magnesium salicylate (content of (B) / (of (B) The content + the content of (C))) is preferably 0.05 or more and 0.95 or less, more preferably 0.05 or more and 0.75 or less, and still more preferably 0.05 or more and 0.95 or less, more preferably 0.05 or more and 0.75 or less. 05 or more and 0.50 or less. When the ratio is within the above range, the fuel saving performance is further improved.
〔Ｄ〕粘度指数向上剤
　本発明の潤滑油組成物は、粘度指数向上剤を含む。粘度指数向上剤としては、内燃機関用潤滑油組成物の分野で一般に使用されているものを使用することができる。具体的には、ポリメタクリレート、オレフィンコポリマー、ポリブテン、ポリイソブテン、ポリイソブチレン、ポリスチレン、エチレン－プロピレン共重合体、およびスチレン－ジエン共重合体およびその水素化物等が使用できる。ポリメタクリレートが好ましい。 [D] Viscosity Index Improver The lubricating oil composition of the present invention contains a viscosity index improver. As the viscosity index improver, those commonly used in the field of lubricating oil compositions for internal combustion engines can be used. Specifically, polymethacrylates, olefin copolymers, polybutene, polyisobutene, polyisobutylene, polystyrene, ethylene-propylene copolymers, styrene-diene copolymers and hydrogenated products thereof can be used. Polymethacrylate is preferred.
　本発明の潤滑油組成物に含まれる粘度指数向上剤の重量平均分子量は、好ましくは１０，０００以上、より好ましくは１００，０００以上、さらに好ましくは２００，０００以上である。上限は、好ましくは１，０００，０００以下、より好ましくは８００，０００以下、さらに好ましくは６００，０００以下である。具体的な範囲としては、好ましくは１０，０００以上１，０００，０００以下、より好ましくは１００，０００以上８００，０００以下、さらに好ましくは２００，０００以上６００，０００以下である。
　高分子ポリマーの重量平均分子量は、それぞれゲルパーミエーションクロマトグラフィー（ＧＰＣ）で求められる値（ポリスチレン換算により得られた分子量）を意味する。 The weight average molecular weight of the viscosity index improver contained in the lubricating oil composition of the present invention is preferably 10,000 or more, more preferably 100,000 or more, and still more preferably 200,000 or more. The upper limit is preferably 1,000,000 or less, more preferably 800,000 or less, even more preferably 600,000 or less. A specific range is preferably 10,000 or more and 1,000,000 or less, more preferably 100,000 or more and 800,000 or less, and still more preferably 200,000 or more and 600,000 or less.
The weight average molecular weight of a high molecular weight polymer means a value (molecular weight obtained by polystyrene conversion) determined by gel permeation chromatography (GPC).
　本発明の潤滑油組成物に含まれる粘度指数向上剤の含有量は、潤滑油組成物の１５０℃におけるＨＴＨＳ粘度が、１．７以上２．３ｍＰａ・ｓ以下となり、且つ１００℃のＨＴＨＳ粘度が、４．８ｍＰａ・ｓ以下となるように適宜調整することが好ましい。本発明の潤滑油組成物に含まれる粘度指数向上剤の含有量は、潤滑油組成物全量基準で０．１質量％以上、好ましくは０．２質量％以上、より好ましくは０．３質量％以上、さらに好ましくは０．５質量％以上である。上限は、１０質量％以下、好ましくは８質量％以下、より好ましくは５質量％以下、さらに好ましくは４質量％以下である。具体的な範囲としては、０．１質量％以上１０質量％以下、好ましくは０．２質量％以上８質量％以下、より好ましくは０．３質量％以上５質量％以下、さらに好ましくは０．５質量％以上４質量％以下である。 The content of the viscosity index improver contained in the lubricating oil composition of the present invention is such that the HTHS viscosity of the lubricating oil composition at 150°C is 1.7 or more and 2.3 mPa s or less, and the HTHS viscosity at 100°C is , 4.8 mPa·s or less. The content of the viscosity index improver contained in the lubricating oil composition of the present invention is 0.1% by mass or more, preferably 0.2% by mass or more, more preferably 0.3% by mass based on the total amount of the lubricating oil composition. Above, more preferably 0.5% by mass or more. The upper limit is 10% by mass or less, preferably 8% by mass or less, more preferably 5% by mass or less, and even more preferably 4% by mass or less. A specific range is 0.1% by mass or more and 10% by mass or less, preferably 0.2% by mass or more and 8% by mass or less, more preferably 0.3% by mass or more and 5% by mass or less, and still more preferably 0.3% by mass or more and 5% by mass or less. It is 5 mass % or more and 4 mass % or less.
〔Ｅ〕モリブデン系摩擦調整剤
　本発明の潤滑油組成物は、（Ｅ）モリブデン系摩擦調整剤を摩擦調整剤としてさらに含むことが好ましい。成分（Ｅ）としては、モリブデンジチオカーバメート（以下、単にＭｏＤＴＣと称することがある。）が好ましい。 [E] Molybdenum-Based Friction Modifier The lubricating oil composition of the present invention preferably further contains (E) a molybdenum-based friction modifier as a friction modifier. As component (E), molybdenum dithiocarbamate (hereinafter sometimes simply referred to as MoDTC) is preferred.
　ＭｏＤＴＣとしては、例えば次の式（３）で表される化合物を用いることができる。 As MoDTC, for example, a compound represented by the following formula (3) can be used.
Figure JPOXMLDOC01-appb-C000003
Figure JPOXMLDOC01-appb-C000003
　前記式（３）中、Ｒ３～Ｒ６は、それぞれ同一でも異なっていてもよく、炭素数２～２４のアルキル基または炭素数６～２４の（アルキル）アリール基、好ましくは炭素数４～１３のアルキル基または炭素数１０～１５の（アルキル）アリール基である。アルキル基は第１級アルキル基、第２級アルキル基、第３級アルキル基のいずれでもよく、また直鎖でも分枝状でもよい。なお「（アルキル）アリール基」は「アリール基もしくはアルキルアリール基」を意味する。アルキルアリール基において、芳香環におけるアルキル基の置換位置は任意である。Ｘ１～Ｘ４はそれぞれ独立に硫黄原子または酸素原子であり、Ｘ１～Ｘ４のうち少なくとも１つは硫黄原子である。 In the above formula (3), R 3 to R 6 may be the same or different, and are alkyl groups having 2 to 24 carbon atoms or (alkyl)aryl groups having 6 to 24 carbon atoms, preferably 4 to 4 carbon atoms. 13 alkyl groups or (alkyl)aryl groups having 10 to 15 carbon atoms. The alkyl group may be a primary alkyl group, secondary alkyl group or tertiary alkyl group, and may be linear or branched. In addition, "(alkyl)aryl group" means "aryl group or alkylaryl group". In the alkylaryl group, the substitution position of the alkyl group on the aromatic ring is arbitrary. X 1 to X 4 are each independently a sulfur atom or an oxygen atom, and at least one of X 1 to X 4 is a sulfur atom.
　ＭｏＤＴＣ以外のモリブデン系摩擦調整剤としては、例えば、モリブデンジチオホスフェート、酸化モリブデン、モリブデン酸、アンモニウム塩等のモリブデン酸塩、二硫化モリブデン、硫化モリブデン、硫化モリブデン酸、硫黄を含有する有機モリブデン化合物等を挙げることができる。 Molybdenum-based friction modifiers other than MoDTC include, for example, molybdenum dithiophosphate, molybdenum oxide, molybdic acid, molybdates such as ammonium salts, molybdenum disulfide, molybdenum sulfide, molybdenum sulfide, organic molybdenum compounds containing sulfur, and the like. can be mentioned.
　本発明の潤滑油組成物にモリブデン系摩擦調整剤が含まれる場合、その含有量は、潤滑油組成物全量基準で０．０１質量％以上、好ましくは０．１質量％以上、より好ましくは０．２質量％以上、さらに好ましくは０．５質量％以上である。上限は、１０質量％以下、好ましくは８質量％以下、より好ましくは５質量％以下、さらに好ましくは２質量％以下である。具体的な範囲としては、０．０１質量％以上１０質量％以下、好ましくは０．１質量％以上８質量％以下、より好ましくは０．５質量％以上５質量％以下、さらに好ましくは０．５質量％以上２質量％以下である。 When the lubricating oil composition of the present invention contains a molybdenum-based friction modifier, its content is 0.01% by mass or more, preferably 0.1% by mass or more, more preferably 0, based on the total amount of the lubricating oil composition. 0.2% by mass or more, more preferably 0.5% by mass or more. The upper limit is 10% by mass or less, preferably 8% by mass or less, more preferably 5% by mass or less, and even more preferably 2% by mass or less. A specific range is 0.01% by mass to 10% by mass, preferably 0.1% by mass to 8% by mass, more preferably 0.5% by mass to 5% by mass, and still more preferably 0.5% by mass to 8% by mass. It is 5 mass % or more and 2 mass % or less.
　本発明の潤滑油組成物に含まれるモリブデン系摩擦調整剤由来のモリブデンの量は、潤滑油組成物全量基準で、好ましくは１００質量ｐｐｍ以上、より好ましくは５００質量ｐｐｍ以上である。上限は、好ましくは２０００質量ｐｐｍ以下、より好ましくは１０００質量ｐｐｍ以下である。具体的な範囲としては、好ましくは１００質量ｐｐｍ以上２０００質量ｐｐｍ以下、より好ましくは５００質量ｐｐｍ以上１０００質量ｐｐｍ以下である。モリブデン含有量が前記下限値以上であることにより、省燃費性能を高めることができる。またモリブデン含有量が前記上限値以下であることにより、潤滑油組成物の貯蔵安定性を高めることができる。 The amount of molybdenum derived from the molybdenum-based friction modifier contained in the lubricating oil composition of the present invention is preferably 100 ppm by mass or more, more preferably 500 ppm by mass or more, based on the total amount of the lubricating oil composition. The upper limit is preferably 2000 mass ppm or less, more preferably 1000 mass ppm or less. A specific range is preferably 100 mass ppm or more and 2000 mass ppm or less, more preferably 500 mass ppm or more and 1000 mass ppm or less. When the molybdenum content is equal to or higher than the lower limit value, fuel saving performance can be enhanced. Moreover, when the molybdenum content is equal to or less than the above upper limit value, the storage stability of the lubricating oil composition can be enhanced.
　（その他の添加剤）
　本発明の潤滑油組成物は、さらに、摩耗防止剤、酸化防止剤または分散剤を含むことができる。 (Other additives)
The lubricating oil composition of the present invention may further contain antiwear agents, antioxidants or dispersants.
　摩耗防止剤としては、ジアルキルジチオリン酸亜鉛（ＺｎＤＴＰ）を添加することが好ましい。例えば、ジアルキルジチオリン酸亜鉛としては、次の一般式（４）に示す化合物を挙げることができる。 As an antiwear agent, it is preferable to add zinc dialkyldithiophosphate (ZnDTP). Examples of zinc dialkyldithiophosphates include compounds represented by the following general formula (4).
Figure JPOXMLDOC01-appb-C000004
Figure JPOXMLDOC01-appb-C000004
　前記一般式（４）中のＲ７～Ｒ１０は、それぞれ独立に、水素原子または炭素数１～２４の直鎖状もしくは分枝状のアルキル基であり、Ｒ７～Ｒ１０のうち少なくとも１つは、炭素数１～２４の直鎖状または分枝状のアルキル基である。このアルキル基は、第１級でも、第２級でも、第３級であってもよい。
　本発明の潤滑油組成物においては、これらのジアルキルジチオリン酸亜鉛は一種を単独で用いてもよく、二種以上を組み合わせて用いてもよい。ジアルキルジチオリン酸亜鉛としては、第１級アルキル基を有するジチオリン酸亜鉛（プライマリーＺｎＤＴＰ）または第２級アルキル基を含有するジチオリン酸亜鉛（セカンダリーＺｎＤＴＰ）が好ましく、特には、第２級のアルキル基のジチオリン酸亜鉛を主成分とするものが、耐摩耗性を高めるため好ましい。 R 7 to R 10 in the general formula (4) each independently represent a hydrogen atom or a linear or branched alkyl group having 1 to 24 carbon atoms, and at least one of R 7 to R 10 One is a linear or branched alkyl group having 1 to 24 carbon atoms. The alkyl group can be primary, secondary or tertiary.
In the lubricating oil composition of the present invention, one of these zinc dialkyldithiophosphates may be used alone, or two or more thereof may be used in combination. The zinc dialkyldithiophosphate is preferably a zinc dithiophosphate having a primary alkyl group (primary ZnDTP) or a zinc dithiophosphate having a secondary alkyl group (secondary ZnDTP). A material containing zinc dithiophosphate as a main component is preferable because it enhances wear resistance.
　本発明の潤滑油組成物にジアルキルジチオリン酸亜鉛が含まれる場合、その含有量は、潤滑油組成物全量基準で０．０１質量％以上、好ましくは０．１質量％以上、より好ましくは０．２質量％以上、さらに好ましくは０．５質量％以上である。上限は、１０質量％以下、好ましくは８質量％以下、より好ましくは５質量％以下、さらに好ましくは２質量％以下である。具体的な範囲としては、０．０１質量％以上１０質量％以下、好ましくは０．１質量％以上８質量％以下、より好ましくは０．５質量％以上５質量％以下、さらに好ましくは０．５質量％以上２質量％以下である。 When the lubricating oil composition of the present invention contains zinc dialkyldithiophosphate, its content is 0.01% by mass or more, preferably 0.1% by mass or more, more preferably 0.1% by mass or more, based on the total amount of the lubricating oil composition. It is 2% by mass or more, more preferably 0.5% by mass or more. The upper limit is 10% by mass or less, preferably 8% by mass or less, more preferably 5% by mass or less, and even more preferably 2% by mass or less. A specific range is 0.01% by mass to 10% by mass, preferably 0.1% by mass to 8% by mass, more preferably 0.5% by mass to 5% by mass, and still more preferably 0.5% by mass to 8% by mass. It is 5 mass % or more and 2 mass % or less.
　本発明の潤滑油組成物に含まれるジアルキルジチオリン酸亜鉛由来のリンの量は、組成物全量基準で、好ましくは１００質量ｐｐｍ以上、より好ましくは５００質量ｐｐｍ以上である。上限は、好ましくは２０００質量ｐｐｍ以下、より好ましくは１０００質量ｐｐｍ以下である。具体的な範囲としては、好ましくは１００質量ｐｐｍ以上２０００質量ｐｐｍ以下、より好ましくは５００質量ｐｐｍ以上１０００質量ｐｐｍ以下である。 The amount of phosphorus derived from zinc dialkyldithiophosphate contained in the lubricating oil composition of the present invention is preferably 100 ppm by mass or more, more preferably 500 ppm by mass or more, based on the total amount of the composition. The upper limit is preferably 2000 mass ppm or less, more preferably 1000 mass ppm or less. A specific range is preferably 100 mass ppm or more and 2000 mass ppm or less, more preferably 500 mass ppm or more and 1000 mass ppm or less.
　酸化防止剤としては、フェノール系酸化防止剤やアミン系酸化防止剤等の公知の酸化防止剤を使用可能である。例としては、アルキル化ジフェニルアミン、フェニル－α－ナフチルアミン、アルキル化－α－ナフチルアミンなどのアミン系酸化防止剤、２，６－ジ－ｔ－ブチル－４－メチルフェノール、４，４’－メチレンビス（２，６－ジ－ｔ－ブチルフェノール）などのフェノール系酸化防止剤などを挙げることができる。
　潤滑油組成物が酸化防止剤を含む場合、その含有量は、潤滑油組成物全量基準で、通常５．０質量％以下であり、好ましくは３．０質量％以下であり、また好ましくは０．１質量％以上であり、より好ましくは０．５質量％以上である。 As the antioxidant, known antioxidants such as phenol antioxidants and amine antioxidants can be used. Examples include aminic antioxidants such as alkylated diphenylamine, phenyl-α-naphthylamine, alkylated-α-naphthylamine, 2,6-di-t-butyl-4-methylphenol, 4,4′-methylenebis( 2,6-di-t-butylphenol) and other phenolic antioxidants.
When the lubricating oil composition contains an antioxidant, its content is usually 5.0% by mass or less, preferably 3.0% by mass or less, and preferably 0, based on the total amount of the lubricating oil composition. .1% by mass or more, more preferably 0.5% by mass or more.
　分散剤としては、無灰分散剤、例えば、コハク酸イミドまたはベンジルアミンなどが挙げられる。
　潤滑油組成物が分散剤を含む場合、その含有量は、潤滑油組成物全量基準で、通常５．０質量％以下であり、また好ましくは０．１質量％以上である。 Dispersants include ashless dispersants such as succinimide or benzylamine.
When the lubricating oil composition contains a dispersant, its content is usually 5.0% by mass or less, preferably 0.1% by mass or more, based on the total amount of the lubricating oil composition.
　本発明の潤滑油組成物は、さらにその性能を向上するために、その目的に応じて潤滑油に一般的に使用されている他の添加剤を含むことができる。そのような添加剤としては、摩耗防止剤または極圧剤、流動点降下剤、腐食防止剤、防錆剤、金属不活性化剤、消泡剤等の添加剤等を挙げることができる。 The lubricating oil composition of the present invention can contain other additives commonly used in lubricating oils depending on the purpose in order to further improve its performance. Examples of such additives include additives such as wear inhibitors or extreme pressure agents, pour point depressants, corrosion inhibitors, rust inhibitors, metal deactivators, antifoaming agents, and the like.
（内燃機関用潤滑油組成物）
　本発明の潤滑油組成物の１５０℃におけるＨＴＨＳ粘度は、１．７以上２．３ｍＰａ・ｓ以下である。１５０℃におけるＨＴＨＳ粘度が２．３ｍＰａ・ｓ以下であることにより、良好な省燃費性能を得ることができる。１．７ｍＰａ・ｓを下回ると、潤滑性不足となる可能性がある。
　本発明の潤滑油組成物の１５０℃におけるＨＴＨＳ粘度は、より好ましくは１．７ｍＰａ・ｓ以上２．２ｍＰａ・ｓ以下、より好ましくは１．７ｍＰａ・ｓ以上２．１ｍＰａ・ｓ以下、さらに好ましくは１．７ｍＰａ・ｓ以上２．０ｍＰａ・ｓ以下である。
　本明細書において、１５０℃におけるＨＴＨＳ粘度とは、ＡＳＴＭ　Ｄ　４６８３に規定される１５０℃での高温高せん断粘度を示す。 (Lubricating oil composition for internal combustion engine)
The HTHS viscosity at 150°C of the lubricating oil composition of the present invention is 1.7 or more and 2.3 mPa·s or less. When the HTHS viscosity at 150°C is 2.3 mPa·s or less, good fuel economy performance can be obtained. If it is less than 1.7 mPa·s, lubricity may be insufficient.
The HTHS viscosity at 150° C. of the lubricating oil composition of the present invention is more preferably 1.7 mPa s or more and 2.2 mPa s or less, more preferably 1.7 mPa s or more and 2.1 mPa s or less, still more preferably It is 1.7 mPa·s or more and 2.0 mPa·s or less.
As used herein, the HTHS viscosity at 150°C indicates the high temperature high shear viscosity at 150°C defined in ASTM D4683.
　本発明の潤滑油組成物の１００℃におけるＨＴＨＳ粘度は、４．８ｍＰａ・ｓ以下である。１００℃におけるＨＴＨＳ粘度が４．８ｍＰａ・ｓを超える場合には十分な省燃費性能が得られないおそれがある。
　本発明の潤滑油組成物の１００℃におけるＨＴＨＳ粘度は、好ましくは３．０ｍＰａ・ｓ以上４．５ｍＰａ・ｓ以下、より好ましくは３．２ｍＰａ・ｓ以上４．２ｍＰａ・ｓ以下、さらに好ましくは３．４ｍＰａ・ｓ以上４．０ｍＰａ・ｓ以下である。
　本明細書において、１００℃におけるＨＴＨＳ粘度とは、ＡＳＴＭ　Ｄ４６８３に規定される１００℃での高温高せん断粘度を示す。 The HTHS viscosity at 100° C. of the lubricating oil composition of the present invention is 4.8 mPa·s or less. If the HTHS viscosity at 100° C. exceeds 4.8 mPa·s, there is a possibility that sufficient fuel saving performance cannot be obtained.
The HTHS viscosity at 100° C. of the lubricating oil composition of the present invention is preferably 3.0 mPa s or more and 4.5 mPa s or less, more preferably 3.2 mPa s or more and 4.2 mPa s or less, still more preferably 3 .4 mPa·s or more and 4.0 mPa·s or less.
As used herein, the HTHS viscosity at 100°C indicates the high temperature high shear viscosity at 100°C specified in ASTM D4683.
　ＨＴＨＳ粘度（１００℃）／ＨＴＨＳ粘度（１５０℃）は、１．９５以上２．２０未満であることが好ましく、２．００以上２．２０未満であることがより好ましい。 The HTHS viscosity (100°C)/HTHS viscosity (150°C) is preferably 1.95 or more and less than 2.20, more preferably 2.00 or more and less than 2.20.
　本発明の潤滑油組成物の粘度指数は、１４０以上２４０以下であることが好ましく、より好ましくは１４０以上２２０以下である。潤滑油組成物の粘度指数が１４０以上であることにより、１５０℃における低いＨＴＨＳ粘度を維持しながら省燃費性能を向上させることができる。また、潤滑油組成物の粘度指数が２４０を超える場合には、蒸発性が悪化するおそれがある。
　なお、本明細書において粘度指数とは、ＪＩＳ　Ｋ　２２８３－１９９３に準拠して測定された粘度指数を意味する。 The viscosity index of the lubricating oil composition of the present invention is preferably 140 or more and 240 or less, more preferably 140 or more and 220 or less. When the viscosity index of the lubricating oil composition is 140 or more, fuel economy performance can be improved while maintaining a low HTHS viscosity at 150°C. Moreover, if the viscosity index of the lubricating oil composition exceeds 240, the evaporability may deteriorate.
As used herein, the viscosity index means a viscosity index measured according to JIS K 2283-1993.
　本発明の潤滑油組成物の４０℃における動粘度は、好ましくは１０ｍｍ２／ｓ以上、より好ましくは１４ｍｍ２／ｓ以上、さらに好ましくは１６ｍｍ２／ｓ以上、最も好ましくは１８ｍｍｍｍ２／ｓ以上である。上限は、好ましくは３０ｍｍ２／ｓ以下、より好ましくは２８ｍｍ２／ｓ以下、さらに好ましくは２６ｍｍ２／ｓ以下、最も好ましくは２５ｍｍ２／ｓ以下である。具体的な範囲としては、好ましくは１０ｍｍ２／ｓ以上３０ｍｍ２／ｓ以下、より好ましくは１４ｍｍ２／ｓ以上２８ｍｍ２／ｓ以下、さらに好ましくは１６ｍｍ２／ｓ以上２６ｍｍ２／ｓ以下、最も好ましくは１８ｍｍ２／ｓ以上２５ｍｍ２／ｓ以下である。潤滑油組成物の４０℃における動粘度が３０ｍｍ２／ｓ以下であることにより、十分な省燃費性能を得ることができる。また、潤滑油組成物の４０℃における動粘度が１０ｍｍ２／ｓ以上であることにより、潤滑箇所での油膜形成を確保でき、潤滑油組成物の蒸発損失も小さくすることができる。
　なお、本明細書において「４０℃における動粘度」とは、ＡＳＴＭ　Ｄ－４４５に準拠して測定された４０℃での動粘度を意味する。 The kinematic viscosity at 40° C. of the lubricating oil composition of the present invention is preferably 10 mm 2 /s or more, more preferably 14 mm 2 /s or more, still more preferably 16 mm 2 /s or more, most preferably 18 mmmm 2 /s or more. be. The upper limit is preferably 30 mm 2 /s or less, more preferably 28 mm 2 /s or less, even more preferably 26 mm 2 /s or less, most preferably 25 mm 2 /s or less. A specific range is preferably 10 mm 2 /s or more and 30 mm 2 /s or less, more preferably 14 mm 2 /s or more and 28 mm 2 /s or less, still more preferably 16 mm 2 /s or more and 26 mm 2 /s or less, most preferably is 18 mm 2 /s or more and 25 mm 2 /s or less. When the kinematic viscosity at 40° C. of the lubricating oil composition is 30 mm 2 /s or less, sufficient fuel saving performance can be obtained. In addition, when the kinematic viscosity of the lubricating oil composition at 40° C. is 10 mm 2 /s or more, it is possible to ensure the formation of an oil film at the lubricated portion and to reduce the evaporation loss of the lubricating oil composition.
As used herein, "kinematic viscosity at 40°C" means kinematic viscosity at 40°C measured according to ASTM D-445.
　本発明の潤滑油組成物の１００℃における動粘度は、好ましくは３ｍｍ２／ｓ以上、より好ましくは４ｍｍ２／ｓ以上である。上限は、好ましくは７ｍｍ２／ｓ以下、より好ましくは６ｍｍ２／ｓ以下である。具体的な範囲としては、好ましくは３ｍｍ２／ｓ以上７ｍｍ２／ｓ以下、より好ましくは４ｍｍ２／ｓ以上６ｍｍ２／ｓ以下である。 The kinematic viscosity at 100° C. of the lubricating oil composition of the present invention is preferably 3 mm 2 /s or more, more preferably 4 mm 2 /s or more. The upper limit is preferably 7 mm 2 /s or less, more preferably 6 mm 2 /s or less. A specific range is preferably 3 mm 2 /s or more and 7 mm 2 /s or less, more preferably 4 mm 2 /s or more and 6 mm 2 /s or less.
　本発明の潤滑油組成物の１５℃における密度（ρ１５）は、好ましくは０．８６０以下、より好ましくは０．８５０以下である。なお、本明細書において１５℃における密度とは、ＪＩＳ　Ｋ　２２４９－１９９５に準拠して１５℃において測定された密度を意味する。 The density (ρ15) at 15°C of the lubricating oil composition of the present invention is preferably 0.860 or less, more preferably 0.850 or less. In this specification, the density at 15°C means the density measured at 15°C according to JIS K 2249-1995.
　本発明の潤滑油組成物の蒸発損失量は、２５０℃におけるＮＯＡＣＫ蒸発量は、３０質量％以下であることが好ましい。潤滑油基油成分のＮＯＡＣＫ蒸発量が３０質量％を超える場合、潤滑油の蒸発損失が大きく、粘度増加等の原因となるため好ましくない。なお本明細書においてＮＯＡＣＫ蒸発量とは、ＡＳＴＭ　Ｄ　５８００に準拠して測定される潤滑油の蒸発量である。潤滑油組成物の２５０℃におけるＮＯＡＣＫ蒸発量の下限は特に制限されるものではないが、通常５質量％以上である。 As for the evaporation loss of the lubricating oil composition of the present invention, the NOACK evaporation at 250°C is preferably 30% by mass or less. If the NOACK evaporation amount of the lubricating base oil component exceeds 30% by mass, the evaporation loss of the lubricating oil is large, which causes an increase in viscosity and the like, which is not preferable. In this specification, the NOACK evaporation amount is the evaporation amount of lubricating oil measured according to ASTM D5800. The lower limit of the NOACK evaporation amount of the lubricating oil composition at 250° C. is not particularly limited, but is usually 5% by mass or more.
　実施例を用いて、以下に本発明を説明する。本発明は、以下の実施形態に限定されるものではない。なお、特に説明のない限り、％は質量％を示す。 The present invention will be described below using examples. The present invention is not limited to the following embodiments. Unless otherwise specified, % indicates % by mass.
＜潤滑油の配合＞
　各実施例および各比較例について表１～２に示す配合割合で、基油および添加剤を配合することによって、試験用潤滑油組成物を調製した。得られた試験用潤滑油組成物に対して、次に示す評価を行った。評価結果を表１～２に示す。 <Combination of lubricating oil>
Lubricating oil compositions for testing were prepared by blending base oils and additives at the blending ratios shown in Tables 1 and 2 for each example and each comparative example. The following evaluations were performed on the obtained lubricating oil composition for test. Evaluation results are shown in Tables 1 and 2.
（Ａ）潤滑油基油
・基油１：グループＩＩＩ基油（鉱油）　動粘度３．３ｍｍ２／ｓ（１００℃）、粘度指数　１１２
・基油２：グループＩＩＩ基油（鉱油）　動粘度４．３ｍｍ２／ｓ（１００℃）、粘度指数　１２３
　表１～２に示した質量比で基油を混合し、潤滑油基油を調製した。表中、基油の数値は基油全量基準での質量比を表している。 (A) Lubricating base oil / base oil 1: Group III base oil (mineral oil) Kinematic viscosity 3.3 mm 2 /s (100 ° C.), viscosity index 112
・Base oil 2: Group III base oil (mineral oil) kinematic viscosity 4.3 mm 2 /s (100°C), viscosity index 123
Lubricating base oils were prepared by mixing base oils at the mass ratios shown in Tables 1 and 2. In the table, the numerical value of the base oil represents the mass ratio based on the total amount of the base oil.
（２）添加剤
　表１～２に記載の通り、添加剤を添加した。添加剤の詳細は以下の通りである。添加剤の配合量は、潤滑油組成物全量基準である。
（Ｂ）金属系清浄剤１：カルシウムサリシレート（カルシウム含有量が８．０質量％、塩基価：２２５ｍｇＫＯＨ／ｇ）
（Ｃ）金属系清浄剤２：マグネシウムサリシレート（マグネシウム含有量が７．４質量％、塩基価：３４２ｍｇＫＯＨ／ｇ）
（Ｄ）粘度指数向上剤
・粘度指数向上剤１：ポリメタクリレート（重量平均分子量５２０，０００）
（Ｅ）摩擦調整剤
・摩擦調整剤１：モリブデンジチオカーバメート（モリブデン含有量が９．１質量％、硫黄含有量が１０．８質量％） (2) Additives Additives were added as described in Tables 1 and 2. The details of the additive are as follows. The blending amount of the additive is based on the total amount of the lubricating oil composition.
(B) Metallic detergent 1: calcium salicylate (calcium content: 8.0% by mass, base number: 225 mgKOH/g)
(C) Metallic detergent 2: magnesium salicylate (magnesium content is 7.4% by mass, base number: 342 mgKOH/g)
(D) Viscosity index improver Viscosity index improver 1: Polymethacrylate (weight average molecular weight 520,000)
(E) Friction Modifier/Friction Modifier 1: Molybdenum dithiocarbamate (molybdenum content 9.1% by mass, sulfur content 10.8% by mass)
・摩耗防止剤１：ジアルキルジチオリン酸亜鉛（亜鉛含有量が９．３質量％、リン含有量が９．３質量％、硫黄含有量が１７．６質量％、セカンダリーＺｎＤＴＰ）
・分散剤１：コハク酸ポリイミド（窒素含有量１．７５質量％）
・酸化防止剤１：アミン系酸化防止剤
・酸化防止剤２：フェノール系酸化防止剤 Anti-wear agent 1: zinc dialkyldithiophosphate (zinc content 9.3% by mass, phosphorus content 9.3% by mass, sulfur content 17.6% by mass, secondary ZnDTP)
- Dispersant 1: Polyimide succinate (nitrogen content 1.75% by mass)
・Antioxidant 1: amine antioxidant ・Antioxidant 2: phenolic antioxidant
＜評価方法＞
（１）省燃費性能
　各試験用潤滑油組成物について、モータリングエンジントルク試験を行った。各試験用潤滑油組成物について、当該潤滑油組成物（油温８０℃）により潤滑されたＤＯＨＣエンジン（排気量１．２Ｌ）の出力軸を電動モータにより一定速度で回転させるのに必要なトルクを測定した。測定は１０００ｒｐｍ、２０００ｒｐｍ、および３０００ｒｐｍで行い、比較例１における測定値に対するトルクの低減率を算出した。トルクの低減率が高いほど省燃費性能に優れることを意味する。 <Evaluation method>
(1) Fuel Saving Performance A motoring engine torque test was performed on each test lubricating oil composition. For each test lubricating oil composition, the torque required to rotate the output shaft of the DOHC engine (displacement 1.2 L) lubricated with the lubricating oil composition (oil temperature 80 ° C.) at a constant speed with an electric motor was measured. Measurements were performed at 1000 rpm, 2000 rpm, and 3000 rpm, and the torque reduction rate with respect to the measured value in Comparative Example 1 was calculated. It means that the higher the torque reduction rate, the better the fuel efficiency.
　各試験用潤滑油組成物の評価結果を以下の表１～２に示す。なお、実施例１～８および比較例１の各試験用潤滑油組成物の１５℃における密度は、いずれも０．８５０以下である。 The evaluation results of each test lubricating oil composition are shown in Tables 1 and 2 below. The density at 15° C. of each test lubricating oil composition of Examples 1 to 8 and Comparative Example 1 is all 0.850 or less.
Figure JPOXMLDOC01-appb-T000005
Figure JPOXMLDOC01-appb-T000005
Figure JPOXMLDOC01-appb-T000006
Figure JPOXMLDOC01-appb-T000006
　実施例１～８は、１０００ｒｐｍ、２０００ｒｐｍ、３０００ｒｐｍのすべての条件において、比較例１と比較してトルクが低減された。したがって、実施例１～８は、比較例１に対して、省燃費性能に優れている。 In Examples 1 to 8, torque was reduced compared to Comparative Example 1 under all conditions of 1000 rpm, 2000 rpm and 3000 rpm. Therefore, Examples 1 to 8 are superior to Comparative Example 1 in fuel saving performance.
　本発明の内燃機関用潤滑油組成物によれば、良好な省燃費性能を具備する内燃機関用潤滑油組成物を提供することができる。
 
  According to the lubricating oil composition for an internal combustion engine of the present invention, it is possible to provide a lubricating oil composition for an internal combustion engine that exhibits good fuel economy performance.

Claims (4)

  1. 　（Ａ）潤滑油基油、
    　（Ｂ）マグネシウムサリシレート、
    　（Ｃ）カルシウムサリシレート、および
    　（Ｄ）粘度指数向上剤、
    を含む内燃機関用潤滑油組成物であって、
    　１５０℃のＨＴＨＳ粘度が、１．７以上２．３ｍＰａ・ｓ以下であり、
    　１００℃のＨＴＨＳ粘度が、４．８ｍＰａ・ｓ以下である
    ことを特徴とする内燃機関用潤滑油組成物。     (A) lubricating base oil,
    (B) magnesium salicylate;
    (C) a calcium salicylate, and (D) a viscosity index improver,
    A lubricating oil composition for an internal combustion engine comprising
    HTHS viscosity at 150 ° C. is 1.7 or more and 2.3 mPa s or less,
    A lubricating oil composition for an internal combustion engine, which has an HTHS viscosity at 100°C of 4.8 mPa·s or less.
  2. 　（Ａ）潤滑油基油の１００℃における動粘度が４．２ｍｍ２／ｓ未満であり、
    潤滑油組成物の粘度指数が１４０以上である、請求項１に記載の内燃機関用潤滑油組成物。     (A) the kinematic viscosity at 100° C. of the lubricating base oil is less than 4.2 mm 2 /s;
    The lubricating oil composition for an internal combustion engine according to claim 1, wherein the lubricating oil composition has a viscosity index of 140 or more.
  3. 　前記（Ｂ）マグネシウムサリシレートおよび（Ｃ）カルシウムサリシレートの含有量の合計が、潤滑油組成物全量基準で、金属量として１４００質量ｐｐｍ以上２０００質量ｐｐｍ以下であり、
    　（Ｂ）の含有量／（（Ｂ）の含有量＋（Ｃ）の含有量）が、質量ｐｐｍ基準で、０．０５以上０．９５以下である、請求項１または２に記載の内燃機関用潤滑油組成物。     The total content of (B) magnesium salicylate and (C) calcium salicylate is 1400 mass ppm or more and 2000 mass ppm or less as a metal content based on the total amount of the lubricating oil composition,
    The internal combustion engine according to claim 1 or 2, wherein the content of (B)/(content of (B) + content of (C)) is 0.05 or more and 0.95 or less on mass ppm basis. lubricating oil composition for
  4. 　１５０℃のＨＴＨＳ粘度が、１．７以上２．０ｍＰａ・ｓ以下であり、
    １００℃のＨＴＨＳ粘度が、４．２ｍＰａ・ｓ以下である、
    請求項１～３のいずれかに記載の内燃機関用潤滑油組成物。
     
     
          HTHS viscosity at 150 ° C. is 1.7 or more and 2.0 mPa s or less,
    HTHS viscosity at 100 ° C. is 4.2 mPa s or less,
    The lubricating oil composition for internal combustion engines according to any one of claims 1 to 3.
PCT/JP2022/021114 2021-05-25 2022-05-23 Lubricant composition for internal combustion engine WO2022250017A1 (en)

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WO2018212339A1 (en) * 2017-05-19 2018-11-22 Ｊｘｔｇエネルギー株式会社 Internal combustion engine lubricating oil composition
WO2019221296A1 (en) * 2018-05-18 2019-11-21 Ｊｘｔｇエネルギー株式会社 Lubricating oil composition for internal combustion engines

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CN105349225A (en) * 2015-11-11 2016-02-24 龙蟠润滑新材料（天津）有限公司 Full-effect energy-saving type lubricating oil composition
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