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.

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  • 2021-05-25 JP JP2021087451A patent/JP2022180775A/ja active Pending
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