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  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
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  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/102—Aliphatic fractions
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  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/02—Hydroxy compounds
  • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
  • C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
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  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/26—Overbased carboxylic acid salts
  • C10M2207/262—Overbased carboxylic acid salts derived from hydroxy substituted aromatic acids, e.g. salicylates
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  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/28—Esters
  • C10M2207/281—Esters of (cyclo)aliphatic monocarboxylic acids
  • C10M2207/2815—Esters of (cyclo)aliphatic monocarboxylic acids used as base material
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  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/40—Fatty vegetable or animal oils
  • C10M2207/401—Fatty vegetable or animal oils used as base material
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  • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
  • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
  • C10M2209/084—Acrylate; Methacrylate
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  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
  • C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
  • C10M2215/064—Di- and triaryl amines
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  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/086—Imides
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  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/22—Heterocyclic nitrogen compounds
  • C10M2215/223—Five-membered rings containing nitrogen and carbon only
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  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/24—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions having hydrocarbon substituents containing thirty or more carbon atoms, e.g. nitrogen derivatives of substituted succinic acid
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  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/28—Amides; Imides
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  • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
  • C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
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  • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
  • C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
  • C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
  • C10M2219/066—Thiocarbamic type compounds
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  • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
  • C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
  • C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
  • C10M2219/066—Thiocarbamic type compounds
  • C10M2219/068—Thiocarbamate metal salts
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  • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
  • C10M2219/08—Thiols; Sulfides; Polysulfides; Mercaptals
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  • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
  • C10M2219/08—Thiols; Sulfides; Polysulfides; Mercaptals
  • C10M2219/082—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
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  • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
  • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
  • C10M2223/04—Phosphate esters
  • C10M2223/045—Metal containing thio derivatives
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  • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
  • C10M2229/02—Unspecified siloxanes; Silicones
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  • C10N2010/00—Metal present as such or in compounds
  • C10N2010/04—Groups 2 or 12
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  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
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  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/40—Low content or no content compositions
  • C10N2030/42—Phosphor free or low phosphor content compositions
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  • C10N2030/40—Low content or no content compositions
  • C10N2030/45—Ash-less or low ash content
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  • C10N2030/78—Fuel contamination
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  • C10N2040/00—Specified use or application for which the lubricating composition is intended
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  • C10N2060/00—Chemical after-treatment of the constituents of the lubricating composition
  • C10N2060/02—Reduction, e.g. hydrogenation

Definitions

• the present invention relates to a lubricating oil composition used for an internal combustion engine using a fuel derived from natural fats and oils.
• Internal combustion engine in particular diesel engines, measures to reduce the environmental pollution caused by particulate matter (PM) and exhaust gas components such as NO X, such as soot has become an important issue.
• an exhaust gas purification device such as a diesel particulate filter (DPF) or an exhaust gas purification catalyst (oxidation or reduction catalyst) on the automobile.
• soot generated in a diesel engine is removed by oxidation and combustion after adhering to the DPF.
• fuel post-injection is generally performed in order to burn the soot accumulated in the filter. This post-injection increases the dilution of fuel into the engine oil and is expected to reduce the engine oil performance.
• biofuel tends to accumulate in engine oil due to its physical properties, and a polar compound is generated when biofuel is degraded and decomposed, so that it has a significant adverse effect on the corrosion of engine parts (pistons, etc.).
• the filter is easily clogged with metal oxides, sulfates, carboxylates and the like generated by combustion.
• the metal content and sulfur content in the lubricating oil be as low as possible. Therefore, it is preferable to reduce the phosphorus content and sulfur content in the lubricating oil from the viewpoint of measures against deterioration of the exhaust gas purification catalyst.
• a main object of the present invention is to provide a lubricating oil composition that is less affected by corrosion on engine parts even when biofuel or a fuel mixed with biofuel is used in an internal combustion engine such as a diesel engine.
• the present invention provides the following lubricating oil composition to solve the above-described problems.
• a fuel containing at least one selected from natural fats and oils, hydrotreated products of natural fats and oils, transesterified products of natural fats and oils, and hydrotreated products of transesterified products of natural fats and oils A lubricating oil composition to be used, wherein a sulfur compound containing at least one —C—S—C— bond is blended with a base oil, and the sulfur contained in the —C—S—C— bond is a composition A lubricating oil composition characterized by being 0.3% by mass or less based on the total amount.
• the lubricating oil composition of the present invention in an internal combustion engine using so-called biofuel made of natural fats and oils, even if biofuel is mixed into engine oil, it shows corrosiveness to engine parts such as pistons. There is almost no.
• the ash remaining in the DPF can be reduced in the lubricating oil composition of the present invention, the performance of the DPF does not deteriorate even when used in a diesel engine with a DPF.
• the natural fats and oils in this invention are not restricted to the thing of plant origin, The thing of animal origin is also included.
• the present invention relates to an internal combustion engine using a fuel containing at least one selected from natural fats and oils, hydrotreated products of natural fats and oils, transesterified products of natural fats and oils, and hydrotreated products of transesterified products of natural fats and oils.
• the lubricating oil composition used in the above used in the above.
• natural fats and oils various animal and vegetable fats and oils widely existing in the natural world can be used, but vegetable oils mainly composed of esters of fatty acids and glycerin, such as safflower oil, soybean oil, rapeseed oil, and palm oil.
• Palm kernel oil, cottonseed oil, coconut oil, rice bran oil, sesame oil, castor oil, linseed oil, olive oil, tung oil, coconut oil, peanut oil, kapok oil, cacao oil, wood wax, sunflower oil, corn oil, etc. are preferably used .
• the hydrotreated product of natural fats and oils is a so-called hydrogenated product of the aforementioned fats and oils in the presence of a suitable hydrogenation catalyst.
• nickel catalyst platinum group (Pt, Pd, Rh, Ru) catalyst, cobalt catalyst, chromium oxide catalyst, copper catalyst, osmium catalyst, iridium catalyst, molybdenum catalyst A catalyst etc. are mentioned. Further, it is also preferable to use a combination of two or more of the above catalysts as the hydrogenation catalyst.
• the transesterified product of natural fats and oils is an ester obtained by subjecting a triglyceride constituting natural fats and oils to a transesterification reaction in the presence of a suitable ester synthesis catalyst.
• the fatty acid ester used as a biofuel is manufactured by transesterifying a lower alcohol and fats and oils in the presence of the ester synthesis catalyst.
• the lower alcohol is used as an esterifying agent, and examples thereof include alcohols having 5 or less carbon atoms such as methanol, ethanol, propanol, butanol, and pentanol. Is preferred.
• Such a lower alcohol is generally used in an amount equal to or greater than that of the oil or fat.
• the hydrotreated product of the transesterified product of natural fats and oils is a product obtained by hydrogenating the transesterified product described above in the presence of an appropriate hydrogenation catalyst.
• Natural oils and fats, hydrotreated products of natural fats and oils, transesterified products of natural fats and oils, and hydrotreated products of transesterified products of natural fats and oils can be added to fuels composed of hydrocarbons such as light oil, and mixed Can also be used suitably.
• the base oil used in the lubricating oil composition of the present invention is not particularly limited, and any one of mineral oils and synthetic oils conventionally used as base oils for internal combustion engine lubricating oils may be appropriately selected.
• mineral oil for example, a lubricating oil fraction obtained by distillation under reduced pressure of atmospheric residual oil obtained by atmospheric distillation of crude oil can be desolvated, solvent extracted, hydrocracked, solvent dewaxed, catalytic dehydrated.
• Mineral oil refined by one or more treatments such as wax, hydrorefining, or the like, or mineral oil produced by isomerizing wax, GTL (Gas-To-Liquid) WAX, and the like.
• examples of the synthetic oil include polybutene, polyolefin [ ⁇ -olefin homopolymer or copolymer (eg, ethylene- ⁇ -olefin copolymer)], various esters (eg, polyol ester, dibasic acid ester). And phosphoric acid esters), various ethers (for example, polyphenyl ether), polyglycols, alkylbenzenes, alkylnaphthalenes, and the like.
• polyolefins and polyol esters are particularly preferable.
• 1 type of the said mineral oil may be used as a base oil, and may be used in combination of 2 or more type.
• the said synthetic oil may be used 1 type and may be used in combination of 2 or more type.
• one or more mineral oils and one or more synthetic oils may be used in combination.
• the viscosity of the base oil is not particularly limited and varies depending on the use of the lubricating oil composition.
• the kinematic viscosity at 100 ° C. is preferably 2 to 30 mm 2 / s, more preferably 3 to 15 mm 2 / s, Particularly preferred is 4 to 10 mm 2 / s.
• the kinematic viscosity at 100 ° C. is 2 mm 2 / s or more, the evaporation loss is small, and when it is 30 mm 2 / s or less, the power loss due to the viscous resistance is suppressed, and the fuel efficiency improvement effect is obtained.
• the base oil those having a% CA of 3 or less by ring analysis and a sulfur content of 50 mass ppm or less are preferably used.
• % CA by ring analysis indicates the ratio (percentage) of the aromatic content calculated by the ring analysis ndM method.
• the sulfur content is a value measured in accordance with JIS (Japanese Industrial Standard, hereinafter the same) K2541.
• a base oil having a% CA of 3 or less and a sulfur content of 50 mass ppm or less exhibits a good oxidation stability, can suppress an increase in acid value and sludge, and has a low corrosiveness to metals. Things can be provided.
• a more preferable sulfur content is 30 ppm by mass or less.
• more preferable% CA is 1 or less, and further preferably 0.5 or less.
• the viscosity index of the base oil is preferably 70 or more, more preferably 100 or more, and still more preferably 120 or more.
• the base oil having a viscosity index of 70 or more has a small change in viscosity due to a change in temperature.
• a sulfur compound containing at least one —C—S—C— bond is blended with the aforementioned base oil.
• a sulfur compound preferably has a property of being dissolved or uniformly dispersed in a lubricating base oil.
• sulfur compounds that are used as so-called sulfur-based antioxidants are suitable.
• sulfurized fats and oils are obtained by reacting sulfur and sulfur-containing compounds with fats and oils (lard oil, whale oil, vegetable oil, fish oil, etc.), and the sulfur content is not particularly limited, but generally 5 to 30 mass. % Is preferred. Specific examples thereof include sulfurized lard, sulfurized rapeseed oil, sulfurized castor oil, sulfurized soybean oil, and sulfurized rice bran oil.
• the sulfurized fatty acid include sulfurized oleic acid
• examples of the sulfurized ester include sulfurized methyl oleate, sulfurized rice bran fatty acid octyl, and ditridecylthiodipropionate.
• Examples of the sulfurized olefin suitably used in the present invention include compounds represented by the following formula (1).
• R 1 represents an alkenyl group having 2 to 15 carbon atoms
• R 2 represents an alkyl group or alkenyl group having 2 to 15 carbon atoms.
• This compound is obtained by reacting an olefin having 2 to 15 carbon atoms or a dimer to tetramer thereof with a sulfurizing agent such as sulfur and sulfur chloride, and propylene, isobutene, diisobutene and the like are preferable.
• dihydrocarbyl monosulfide include compounds represented by the following formula (2).
• each of R 3 and R 4 represents an alkyl group having 1 to 20 carbon atoms or a cyclic alkyl group, an aryl group having 6 to 20 carbon atoms, an alkylaryl group having 7 to 20 carbon atoms, or an aryl having 7 to 20 carbon atoms.
• R 3 and R 4 are alkyl groups, they are also referred to as alkyl sulfides.
• R 3 and R 4 in the above formula (2) are methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, various pentyl groups, Various hexyl groups, various heptyl groups, various octyl groups, various nonyl groups, various decyl groups, various dodecyl groups, cyclohexyl groups, cyclooctyl groups, phenyl groups, naphthyl groups, tolyl groups, xylyl groups, benzyl groups, phenethyl groups, etc. Can be mentioned.
• dihydrocarbyl monosulfide examples include dibenzyl monosulfide, various dinonyl monosulfides, various didodecyl monosulfides, various dibutyl monosulfides, various dioctyl monosulfides, diphenyl monosulfide, dicyclohexyl monosulfide, and the like. It can.
• thiadiazole compound for example, 1,3,4-thiadiazole, 1,2,4-thiadiazole compound, 1,4,5-thiadiazole represented by the following formulas (3) to (5) are preferably used.
• R 5 and R 6 each independently represent a hydrocarbon group having 1 to 20 carbon atoms.
• the thiadiazole compound include 2,5-bis (n-hexyldithio) -1,3,4-thiadiazole, 2,5-bis (n-octyldithio) -1,3,4-thiadiazole, 5-bis (n-nonyldithio) -1,3,4-thiadiazole, 2,5-bis (1,1,3,3-tetramethylbutyldithio) -1,3,4-thiadiazole, 3,5-bis (N-hexyldithio) -1,2,4-thiadiazole, 3,5-bis (n-octyldithio) -1,2,4-thiadiazole, 3,5-bis (n-nonyldithio) -1,2, 4-thiadiazole, 3,5-bis (1,1,3,3-tetramethylbutyldithio) -1,2,4-
• Examples of the thiophosphate include alkyl trithiophosphate, aryl or alkylaryl thiophosphate, zinc dilauryl dithiophosphate, and lauryl trithiophosphite and triphenyl thiophosphate are particularly preferable.
• Examples of the alkylthiocarbamoyl compound include the following formulas (6) and (7).
• R 7 to R 10 each independently represents an alkyl group having 1 to 20 carbon atoms.
• R 11 represents an alkylene group having 1 to 20 carbon atoms.
• alkylthiocarbamoyl compound include bis (dimethylthiocarbamoyl) monosulfide, bis (dibutylthiocarbamoyl) monosulfide, bis (dimethylthiocarbamoyl) monosulfide, bis (dibutylthiocarbamoyl) monosulfide, and bis (diamilthio).
• Preferable examples include carbamoyl) monosulfide, bis (dioctylthiocarbamoyl) monosulfide, and methylenebis (dibutyldithiocarbamate).
• thiocarbamate compound for example, zinc dialkyldithiocarbamate
• thioterpene compound for example, a reaction product of phosphorus pentasulfide and pinene
• dialkylthiodipropionate compound for example, dilaurylthiodipropionate.
• distearyl thiodipropionate for example, zinc dialkyldithiocarbamate
• the compounding amount of the above-described sulfur compound needs to be 0.3% by mass or less in terms of the total amount of the composition in terms of sulfur contained in the —C—S—C— bond in the compound. If the sulfur conversion amount contained in the -C-S-C- bond exceeds 0.3% by mass, the corrosiveness to engine parts and the like is increased. This sulfur conversion amount is preferably 0.05 to 0.2% by mass. Furthermore, it is preferable that the sulfur compound does not contain a —C—S x —C— bond (x is an integer of 2 or more). Sulfur compounds having a so-called polysulfide structure are not preferable in terms of corrosiveness to engine parts and the like. In particular, in the presence of biofuel, the elution amount of copper and lead increases.
• the lubricating oil composition of the present invention preferably contains an alkaline earth metal detergent.
• the alkaline earth metal detergent include alkaline earth metal sulfonates, alkaline earth metal phenates, alkaline earth metal salicylates, and mixtures of two or more selected from these.
• Alkaline earth metal sulfonates include alkaline earth metal salts of alkylaromatic sulfonic acids obtained by sulfonated alkyl aromatic compounds having a molecular weight of 300 to 1,500, preferably 400 to 700, particularly magnesium salts and / or Or a calcium salt etc. are mentioned, A calcium salt is used preferably especially.
• Alkaline earth metal phenates include alkylphenols, alkylphenol sulfides, alkaline earth metal salts of Mannich reactants of alkylphenols, particularly magnesium salts and / or calcium salts, among which calcium salts are particularly preferred.
• Examples of the alkaline earth metal salicylates include alkaline earth metal salts of alkyl salicylic acid, particularly magnesium salts and / or calcium salts, among which calcium salts are preferably used.
• the alkyl group constituting the alkaline earth metal detergent is preferably an alkyl group having 4 to 30 carbon atoms, more preferably a linear or branched alkyl group having 6 to 18 carbon atoms, which are linear or branched. But you can. These may also be primary alkyl groups, secondary alkyl groups or tertiary alkyl groups.
• alkaline earth metal sulfonate, alkaline earth metal phenate and alkaline earth metal salicylate the above alkyl aromatic sulfonic acid, alkylphenol, alkylphenol sulfide, Mannich reaction product of alkylphenol, alkylsalicylic acid, etc. are directly used as magnesium and / or Or it reacts with alkaline earth metal bases such as alkaline earth metal oxides and hydroxides of calcium, or once replaced with alkaline earth metal salts such as sodium salts and potassium salts, etc.
• the blending amount of the alkaline earth metal detergent is 0.35% by mass or less, preferably 0.01 to 0.35% by mass, more preferably 0, in terms of alkaline earth metal. .1 to 0.35% by mass.
• the blending amount of the alkaline earth metal detergent is 0.01% by mass or more, the lubricating oil composition is excellent in terms of oxidation stability, base number maintenance, and high temperature cleanability.
• the blending amount of the alkaline earth metal detergent exceeds 0.35% by mass, the performance of the catalyst for purifying exhaust gas may be deteriorated.
• the amount of ash adhering to the DPF increases, which may shorten the life of the DPF.
• the lubricating oil composition of the present invention preferably contains a phenol-based antioxidant and / or an amine-based antioxidant as an antioxidant.
• phenolic antioxidants include octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 4,4′-methylenebis (2,6-di-t-butylphenol); 4,4′-bis (2,6-di-t-butylphenol); 4,4′-bis (2-methyl-6-t-butylphenol); 2,2′-methylenebis (4-ethyl-6-t) -Butylphenol); 2,2'-methylenebis (4-methyl-6-t-butylphenol); 4,4'-butylidenebis (3-methyl-6-t-butylphenol); 4,4'-isopropylidenebis (2 , 6-di-t-butylphenol); 2,2′-methylenebis (4-methyl-6-nonylphenol); 2,2′-isobutyliden
• amine antioxidant examples include monooctyl diphenylamine; monoalkyl diphenylamines such as monononyl diphenylamine; 4,4′-dibutyldiphenylamine; 4,4′-dipentyldiphenylamine; 4,4′-dihexyldiphenylamine; 4,4′-diheptyldiphenylamine; 4,4′-dioctyldiphenylamine; dialkyldiphenylamines such as 4,4′-dinonyldiphenylamine; tetrabutyldiphenylamine; tetrahexyldiphenylamine; tetraoctyldiphenylamine; polyalkyldiphenylamine such as tetranonyldiphenylamine And naphthylamine-based, specifically ⁇ -naphthylamine; phenyl- ⁇ -naphthylamine; Examples include ⁇ -n-
• group antioxidant as another antioxidant.
• a hexavalent molybdenum compound specifically, a product obtained by reacting molybdenum trioxide and / or molybdic acid with an amine compound, for example, described in JP-A-2003-252887 A compound obtained by the production method can be used.
• an amine compound made to react with a hexavalent molybdenum compound Specifically, a monoamine, diamine, a polyamine, and an alkanolamine are mentioned.
• alkyl group having 1 to 30 carbon atoms such as methylamine, ethylamine, dimethylamine, diethylamine, methylethylamine, methylpropylamine and the like (these alkyl groups may be linear or branched).
• alkanol groups may be linear or branched
• methylenediamine, ethylenediamine, propylene Amines and alkylenediamines having 1-30 carbon atoms such as butylenediamine
• polyamines such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine; undecyldiethylamine, undecyldiethanolamine, dodecyldipropanolamine , Oleyldiethanolamine, oleylpropylenediamine, stearyltetraethylenepentamine and other monoamines, diamines, polyamines having a C8-20 alkyl group or alkenyl group, and heterocyclic compounds such as imidazoline; alkylene oxides of these compounds Additives; and mixtures thereof.
• the amount of the antioxidant described above is 0.3% by mass or more, preferably 0.5% by mass or more, based on the total amount of the composition. On the other hand, if it exceeds 2% by mass, it may become insoluble in the lubricating base oil. Accordingly, the blending amount of the antioxidant is preferably in the range of 0.3 to 2% by mass based on the total amount of the composition.
• a viscosity index improver such as a pour point depressant, an antiwear agent, and an ashless friction reducer
• a rust inhibitor, a metal deactivator, a surfactant, an antifoaming agent, and the like may be blended.
• viscosity index improver examples include polymethacrylate, dispersed polymethacrylate, olefin copolymer (for example, ethylene-propylene copolymer), dispersed olefin copolymer, styrene copolymer (for example, Styrene-diene copolymer, styrene-isoprene copolymer, etc.).
• the blending amount of these viscosity index improvers is about 0.5 to 15% by mass, preferably 1 to 10% by mass, based on the total amount of the composition, from the viewpoint of blending effect.
• pour point depressant examples include polymethacrylate having a mass average molecular weight of about 5000 to 50,000.
• Antiwear agents include sulfur such as zinc dithiophosphate, zinc dithiocarbamate, zinc phosphate, disulfides, sulfurized olefins, sulfurized fats and oils, sulfurized esters, thiocarbonates, and thiocarbamates (eg, Mo-DTC).
• Phosphorous esters, phosphoric esters, phosphonic esters, and phosphorus-containing compounds such as amine salts or metal salts thereof; thiophosphites, thiophosphates (for example, Mo-DTP) ), Thiophosphonic acid esters, and sulfur and phosphorus containing antiwear agents such as amine salts or metal salts thereof.
• thiophosphites, thiophosphates (for example, Mo-DTP) ), Thiophosphonic acid esters, and sulfur and phosphorus containing antiwear agents such as amine salts or metal salts thereof.
• the ashless friction reducing agent examples include mono- or bis-type polybutenyl succinimide and / or its borate, benzylamine, polyalkenylamine, and the like, and polybutenyl having a mass average molecular weight of 700 to 3,500.
• a polybutenyl succinimide having a group is preferred.
• Other examples include fatty acids, aliphatic alcohols, aliphatic ethers, aliphatic esters, aliphatic amines and aliphatic amides having at least one alkyl group or alkenyl group having 6 to 30 carbon atoms in the molecule.
• the content of the ashless dispersant is preferably 0.5 to 10 parts by mass with respect to 100 parts by mass of the base oil.
• rust preventive examples include petroleum sulfonate, alkylbenzene sulfonate, dinonylnaphthalene sulfonate, alkenyl succinate, polyhydric alcohol ester and the like.
• the blending amount of these rust preventives is usually about 0.01 to 1% by mass, preferably 0.05 to 0.5% by mass based on the total amount of the composition from the viewpoint of the blending effect.
• metal deactivator copper corrosion inhibitor
• benzotriazole tolyltriazole, thiadiazole, imidazole, and pyrimidine compounds. Of these, benzotriazole compounds are preferred.
• metal corrosion and oxidative deterioration of engine parts can be suppressed.
• Such a metal deactivator is preferably used in combination with the predetermined sulfur compound.
• the compounding amount of these metal deactivators is preferably 0.01 to 0.1% by mass, more preferably 0.03 to 0.05% by mass, based on the total amount of the composition, from the viewpoint of the compounding effect.
• surfactant examples include polyalkylene glycol nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether and polyoxyethylene alkyl naphthyl ether.
• antifoaming agent examples include silicone oil, fluorosilicone oil, and fluoroalkyl ether. From the viewpoint of balance between the antifoaming effect and economy, about 0.005 to 0.1% by mass based on the total amount of the composition. It is preferable to mix.
• the sulfur content is preferably 0.5% by mass or less, more preferably 0.3% by mass or less, and further preferably 0.2% by mass based on the total amount of the composition. It is below mass%.
• the sulfur content is 0.5% by mass or less, it is possible to effectively suppress the performance degradation of the catalyst that purifies the exhaust gas.
• the phosphorus content is preferably 0.12% by mass or less, more preferably 0.1% by mass or less, based on the total amount of the composition. When the phosphorus content is 0.12% by mass or less, it is possible to effectively suppress the performance degradation of the catalyst that purifies the exhaust gas.
• the sulfated ash content is preferably 1.1% by mass or less, and more preferably 1% by mass or less.
• the sulfated ash content is 1.1% by mass or less, it is possible to effectively suppress the performance degradation of the catalyst that purifies the exhaust gas.
• the amount of ash deposited on the DPF filter is small, ash clogging of the filter is suppressed, and the life of the DPF is extended.
• the sulfated ash refers to the ash that has been made by adding sulfuric acid to the carbonized residue generated by burning the sample and heating it to make a constant weight. Usually, to know the approximate amount of metallic additives in the lubricating oil composition Used for.
• the NOACK evaporation amount measured in accordance with JPI (Japan Petroleum Institute, hereinafter the same) -5S-41-93 is 15% by mass or less. More preferably, it is 13 mass% or less, More preferably, it is 10 mass% or less.
• Lubricating oil compositions having the composition shown in Table 1 were prepared and subjected to the corrosive test shown below.
• the kind of each component used for preparation of a lubricating oil composition is as follows.
• Base oil hydrorefined base oil, 40 ° C. kinematic viscosity 20.4 mm 2 / s, 100 ° C.
• Viscosity index improver OCP, mass average molecular weight 800,000
• Pour point depressant polyalkyl methacrylate, mass average molecular weight 60,000
• Metal-based detergent overbased calcium salicylate, base number (perchloric acid method) 225 mgKOH / g, calcium content 7.8 mass%, sulfur content 0.3 mass%
• Polybutenyl succinic acid monoimide A polybutenyl group number average molecular weight 1000, nitrogen content 1.2% by mass, boron content 1.3% by mass
• Polybutenyl succinic acid bisimide B number average molecular weight of polybutenyl group 2,000, nitrogen content 1.2% by mass (7)
• Phenol antioxidant octadecyl 3- (3,5-tert-butyl-4-hydroxyphenyl) propionate
• the property measurement and the corrosivity test of each lubricating oil composition were performed as follows. (Calcium content) Measured according to JPI-5S-38-92. (Sulfur content) The measurement was performed according to JIS K2541. (Phosphorus content) Measured according to JPI-5S-38-92. (Sulfate ash) The measurement was performed according to JIS K2272.
• the lubricating oil composition of the present invention can be suitably used for an internal combustion engine using biofuel or a fuel containing biofuel.

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