WO2018003812A1 - 内燃機関用潤滑油組成物 - Google Patents
内燃機関用潤滑油組成物 Download PDFInfo
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- WO2018003812A1 WO2018003812A1 PCT/JP2017/023617 JP2017023617W WO2018003812A1 WO 2018003812 A1 WO2018003812 A1 WO 2018003812A1 JP 2017023617 W JP2017023617 W JP 2017023617W WO 2018003812 A1 WO2018003812 A1 WO 2018003812A1
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- lubricating oil
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 36
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- 239000002199 base oil Substances 0.000 claims abstract description 48
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 30
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- 125000003118 aryl group Chemical group 0.000 claims abstract description 23
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- 239000011593 sulfur Substances 0.000 claims abstract description 20
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- 239000003921 oil Substances 0.000 claims abstract description 14
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- 125000001183 hydrocarbyl group Chemical group 0.000 claims abstract 7
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- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 5
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- 125000001421 myristyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 5
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- 229940014800 succinic anhydride Drugs 0.000 description 5
- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 5
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Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
- C10M141/10—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic phosphorus-containing compound
-
- 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
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- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/02—Viscosity; Viscosity index
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- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
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- C10N2060/00—Chemical after-treatment of the constituents of the lubricating composition
- C10N2060/14—Chemical after-treatment of the constituents of the lubricating composition by boron or a compound containing boron
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a lubricating oil composition for an internal combustion engine containing an organic molybdenum compound.
- Engine oil is in demand.
- Engine oils formulated with organomolybdenum compounds exhibit excellent lubricity in the early stages of use.
- the lubricity is lowered with the deterioration of the engine oil, and that when used for a long time, only the lubricity equivalent to the engine oil not containing the organic molybdenum compound is exhibited.
- base oils with many aromatic components have a low viscosity index, and when used as engine oil, there is a drawback that sludge is likely to occur at high temperatures.
- sludge is likely to occur at high temperatures.
- there is a limit to the improvement of the antioxidant performance by a phenolic antioxidant or an amine antioxidant and if it is added in a large amount, the effect of improving the lubricity of the organic molybdenum compound may be hindered.
- the zinc dithiophosphate compound when a large amount of the zinc dithiophosphate compound is blended, the phosphorus content in the engine oil increases, and the exhaust gas purification catalyst may be poisoned.
- the object of the present invention is to use a base oil with less aromatic components, and even if it does not contain a large amount of antioxidants and zinc dithiophosphate compounds, the organomolybdenum compound is difficult to decompose for long-term use, and lubrication. It is providing the engine oil composition which can maintain property.
- the present inventors have found that, by adding a borate ester compound, the organomolybdenum compound becomes difficult to decompose even under high temperature and high oxidation conditions, and the lubricity can be maintained for a long time.
- the present invention was completed.
- the present invention provides a base oil which is a hydrocarbon oil having an aromatic component of less than 1% by mass and a sulfur content of less than 20 ppm by mass, and a compound represented by the following general formula (1) as the component (A) And at least one organic molybdenum compound selected from the group consisting of compounds represented by the following general formula (2): 300-1500 mass ppm as a molybdenum atom, and borate ester compound as a component (B), boron A lubricating oil composition for an internal combustion engine containing 100 to 1000 ppm by mass as atoms.
- R 1 to R 4 represent a hydrocarbon group having 1 to 18 carbon atoms, and X 1 to X 4 represent an oxygen atom or a sulfur atom.
- R 5 to R 8 represent a hydrocarbon group having 1 to 18 carbon atoms, and X 5 to X 8 represent an oxygen atom or a sulfur atom.
- the lubricating oil composition for internal combustion engines of the present invention can be used for a long time as a lubricating oil because the organic molybdenum compound contained in the lubricating oil composition is stable for a long time even under high temperature and high oxidation conditions. .
- the base oil of the lubricating oil composition for an internal combustion engine of the present invention is a hydrocarbon oil having an aromatic component of less than 1% by mass and a sulfur content of less than 20 ppm by mass.
- the aromatic component in the base oil is a value obtained by measurement according to the IP346 method stipulated by the British Petroleum Institute, and the sulfur content is obtained by measurement according to JISK2541-7. Value.
- aromatic component derived from the base oil used in the present invention is 1% by mass or more, the organic molybdenum compound is easily decomposed. Further, the content of the aromatic component derived from the base oil used in the present invention is preferably less than 0.8% by mass, more preferably less than 0.5% by mass, and less than 0.2% by mass. Most preferably it is.
- minerals contain sulfur compounds such as thiophene compounds and sulfide compounds. And when sulfur content in the base oil used for this invention is 20 mass ppm or more, it becomes easy to poison an exhaust gas purification catalyst.
- the sulfur content in the base oil used in the present invention is preferably less than 15 ppm by weight, more preferably less than 10 ppm by weight, and most preferably less than 5 ppm by weight.
- the kinematic viscosity at 100 ° C. of the base oil used in the present invention is preferably 2 to 5 mm 2 / s. If the kinematic viscosity at 100 ° C. of the base oil is lower than 2 mm 2 / s, there is a risk that oil film formation at the lubrication point will be insufficient and wear will increase. If it is higher than 5 mm 2 / s, the fuel saving effect will be small. Become.
- Kinematic viscosity at 100 ° C. of the base oil is preferably 2 ⁇ 5mm 2 / s, more preferably 2 ⁇ 4.5mm 2 / s, and most preferably 2.5 ⁇ 4mm 2 / s.
- the viscosity index of the base oil used in the present invention is not particularly limited, but is generally preferably 90 or more, 110 or more, more preferably 120 or more, and most preferably 125 or more.
- the viscosity index of the base oil is lower than 90, the viscosity at low temperature becomes high and the startability may be deteriorated.
- the kinematic viscosity and the viscosity index are values obtained by measurement according to JIS K2283.
- GTL Gas to liquids
- Lubricating oil fraction obtained by atmospheric distillation and / or vacuum distillation is purified by solvent removal, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid washing, clay treatment, etc.
- paraffinic mineral oil normal paraffinic base oil or isoparaffinic base oil refined by combining one or more of the treatments alone or in combination, the content of aromatic components and sulfur content are the above conditions
- the base oil of the present invention may contain an ester base oil, but since the lubricity improvement effect of the component (A) may not be sufficiently obtained, it is preferable not to contain an ester base oil, Even when it contains an ester base oil, it is preferably 3 parts by mass or less, more preferably 1 part by mass or less, and more preferably 0.5 parts by mass with respect to 100 parts by mass of the hydrocarbon base oil.
- ester base oils include dibasic acid esters such as adipic acid ester, azelaic acid ester, sebacic acid ester, dodecanedioic acid ester, and dimer acid ester; polyols such as trimethylolethane ester, trimethylolpropane ester, and pentaerythritol ester Examples include esters.
- the component (A) of the present invention is at least one organic molybdenum compound selected from the group consisting of a compound represented by the general formula (1) and a compound represented by the general formula (2).
- a compound represented by the general formula (1) is preferable because the molecule does not contain a phosphorus atom that causes poisoning of the exhaust gas purification catalyst and is excellent in heat resistance.
- R 1 to R 4 represent a hydrocarbon group having 1 to 18 carbon atoms.
- the hydrocarbon group having 1 to 18 carbon atoms include methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, secondary butyl group, t-butyl group, pentyl group, isopentyl group, and secondary pentyl group.
- T-pentyl group branched pentyl group, hexyl group, secondary hexyl group, branched hexyl group, heptyl group, secondary heptyl group, branched heptyl group, octyl group, secondary octyl group, branched octyl group, nonyl group, 2 Secondary nonyl group, branched nonyl group, decyl group, secondary decyl group, branched decyl group, undecyl group, secondary undecyl group, branched undecyl group, dodecyl group, secondary dodecyl group, branched dodecyl group, tridecyl group, isotridecyl group, Secondary tridecyl group, branched tridecyl group, tetradecyl group, secondary tetradecyl group, branched tetradecyl group, hexadec
- alkyl groups vinyl group, allyl group, propenyl group, butenyl group, isobutenyl group, pentenyl group, isopentenyl group, hexenyl group, heptenyl group, octenyl group, nonenyl group, decenyl group, undecenyl group, dodecenyl group, tetradecenyl group
- An alkenyl group having 2 to 18 carbon atoms such as an oleyl group;
- Phenyl group methylphenyl group, dimethylphenyl group, isopropylphenyl group, trimethylphenyl group, ethylphenyl group, propylphenyl group, butylphenyl group, pentylphenyl group, hexylphenyl group, heptylphenyl group, octylphenyl group, nonylphenyl group , Decylphenyl group, undecylphenyl group, dodecylphenyl group, phenylphenyl group, benzylphenyl group, styrenated phenyl group, p-cumylphenyl group, dinonylphenyl group, ⁇ -naphthyl group, ⁇ -naphthyl group, etc.
- R 1 to R 4 are preferably an alkyl group having 5 to 15 carbon atoms, more preferably an alkyl group having 6 to 14 carbon atoms, and more preferably 7 to 14 carbon atoms because of excellent solubility in base oil and lubricity.
- the alkyl group is most preferred.
- R 1 to R 4 are alkyl groups, branched alkyl groups are preferred to linear alkyl groups because of their excellent solubility in base oils.
- R 1 to R 4 may all be the same group or a combination of two or more groups, but are preferably a combination of two or more groups because of excellent solubility in the base oil.
- a compound in which R 1 and R 2 are 2-ethylhexyl and R 3 and R 4 are branched tridecyl groups is preferable.
- X 1 to X 4 each represents an oxygen atom or a sulfur atom.
- 2 to 3 of X 1 to X 4 are sulfur atoms and the rest are oxygen atoms, more preferably 2 each of sulfur atoms and oxygen atoms, and X 1 to X 4 Most preferably, 2 is a sulfur atom and X 3 to X 4 are oxygen atoms.
- Examples of preferred organomolybdenum compounds represented by the general formula (1) include: R 1 and R 2 are 2-ethylhexyl, R 3 and R 4 are branched tridecyl groups, X 1 to X 2 are sulfur atoms, and X 3 to X An organic molybdenum compound in which 4 is an oxygen atom is mentioned.
- R 5 to R 8 represent a hydrocarbon group having 1 to 18 carbon atoms.
- R 5 to R 8 are preferably an alkyl group having 4 to 16 carbon atoms, more preferably an alkyl group having 6 to 14 carbon atoms, and more preferably 8 to 12 carbon atoms because of excellent solubility in base oil and lubricity.
- the alkyl group is most preferred. Specifically, 2-ethylhexyl group is preferable as R 5 to R 8 .
- X 5 to X 8 each represents an oxygen atom or a sulfur atom.
- 2 to 3 of X 5 to X 8 are sulfur atoms and the rest are oxygen atoms, more preferably 2 each of sulfur atoms and oxygen atoms, and X 5 to X 8
- 6 is a sulfur atom and X 7 to X 8 are oxygen atoms.
- Examples of preferred organic molybdenum compounds represented by the general formula (2) include those in which R 5 to R 8 are 2-ethylhexyl, X 5 to X 6 are sulfur atoms, and X 7 to X 8 are oxygen atoms.
- a compound represented by the general formula (1) is preferable because it does not contain a phosphorus atom in the molecule and hardly causes poisoning of the exhaust gas purification catalyst.
- the content of the component (A) in the lubricating oil composition for internal combustion engines of the present invention is 300 to 1500 mass ppm as molybdenum atoms with respect to the total amount of the lubricating oil composition for internal combustion engines.
- the content of the component (A) is preferably 300 to 1200 ppm by mass, more preferably 500 to 1000 ppm by mass, as molybdenum atoms.
- the component (B) of the present invention is a boric acid ester compound.
- boric acid ester compounds include monoalcohol boric acid esters, borated aliphatic epoxides, borated glycerin fatty acid esters, borated alkoxylated fatty acid amides, etc.
- a borated aliphatic epoxide and a borated glycerin fatty acid ester are preferable, and a borated glycerin fatty acid ester is more preferable.
- the borate ester of monoalcohol is a compound obtained by a dehydration condensation reaction of monoalcohol and boric acid and is excellent in solubility in a base oil, and therefore an aliphatic monool having 4 to 18 carbon atoms is preferable. Specifically, tributyl borate and trioctyl borate are preferable, and tributyl borate is more preferable.
- a borated aliphatic epoxide is a compound obtained by a reaction between an aliphatic epoxide and boric acid, or a dehydration condensation reaction between an aliphatic vicinal diol and boric acid, and has excellent solubility in a base oil.
- the aliphatic epoxide is preferably an aliphatic 1,2-epoxide having 6 to 18 carbon atoms
- the aliphatic vicinal diol is preferably an aliphatic 1,2-diol having 6 to 18 carbon atoms.
- Borated glycerin fatty acid ester is a compound obtained by a reaction of glycerin trifatty acid ester, glycerin and boric acid, or a dehydration condensation reaction between glycerin partial fatty acid ester and boric acid, and is excellent in solubility in base oil.
- the fatty acid is preferably a fatty acid having 8 to 18 carbon atoms.
- a borated alkoxylated fatty acid amide is a compound obtained by a dehydration condensation reaction between a fatty acid monoethanolamide or fatty acid diethanolamide and boric acid.
- fatty acids having 8 to 18 carbon atoms are preferred as fatty acids constituting fatty acid monoethanolamide or fatty acid diethanolamide because of their excellent solubility in base oils.
- the content of the component (B) in the lubricating oil composition for internal combustion engines of the present invention is 100 to 1000 ppm by mass as boron atoms with respect to the total amount of the lubricating oil composition for internal combustion engines of the present invention.
- the content of the component (B) is preferably 110 to 800 ppm by mass, more preferably 130 to 600 ppm by mass, and most preferably 150 to 500 ppm by mass as boron atoms.
- the mass ratio of the boron atom derived from the component (B) to the molybdenum atom derived from the component (A) is preferably 0.20 to 2.2, and more preferably 0.22 to 1.8. 0.29 to 1.5 is most preferable.
- (C) component metallic detergent
- Alkaline earth metal sulfonates, alkaline earth metal phenates, alkaline earth metal salicylates, alkaline earth metal phosphonates, etc. are used as metallic detergents for lubricating oils for internal combustion engines. , Magnesium, calcium, barium and the like.
- the lubricating oil composition for an internal combustion engine of the present invention suppresses decomposition of the component (A), so that the component (C) is at least one selected from the group consisting of calcium-based detergents and magnesium-based detergents.
- the metal detergent is preferably contained in a total amount of calcium atoms and magnesium atoms in an amount of 0.05 to 0.4 mass% with respect to the total amount of the lubricating oil composition for an internal combustion engine of the present invention.
- the component (C) include calcium phenate, calcium salicylate, calcium phosphonate, magnesium phenate, magnesium salicylate, and magnesium phosphonate. Among these, calcium salicylate, calcium phosphonate, and magnesium salicylate are preferable, and calcium salicylate is more preferable.
- Metal-based detergents usually increase TBN by blending an alkaline earth metal carbonate, but the component (C) of the present invention may be partially substituted with borate. .
- the content of the component (C) in the lubricating oil composition for internal combustion engines of the present invention is preferably 0.05 to 0.25% by mass in total of calcium atoms and magnesium atoms, and 0.1 to 0.20. More preferably, it is mass%.
- TBN Total Base Number according to ASTM D2896
- the TBN of the component (C) is preferably 50 to 500 mgKOH / g, more preferably 100 to 400 mgKOH / g, and most preferably 100 to 200 mgKOH / g.
- Component (D): Succinimide type dispersant In general, lubricating oils for internal combustion engines are blended with ashless dispersants to prevent sludge accumulation by dispersing and solubilizing sludge and solubilizing sludge deposits (a stable precursor of sludge). .
- a succinimide type dispersant obtained by a condensation reaction of an alkenyl succinic anhydride and a polyamine compound a succinic ester type dispersant obtained by a condensation reaction of an alkenyl succinic anhydride and a polyol compound
- succinic ester amide type dispersants obtained by condensation reaction of alkenyl succinic anhydride and alkanolamine examples thereof include succinic ester amide type dispersants obtained by condensation reaction of alkenyl succinic anhydride and alkanolamine, Mannich base dispersants obtained by condensing alkylphenol and polyamine with formaldehyde, and boric acid modified products thereof.
- a succinimide type dispersant is added to the total amount of the lubricating oil composition for the internal combustion engine of the present invention. It is preferable to contain 0.5 to 10% by mass.
- the succinimide type dispersant is a compound represented by the following general formula (4) or (5).
- R 13 represents an alkenyl group and m represents a number of 2 to 10.
- R 13 represents an alkenyl group.
- the alkenyl group is preferably a polybutenyl group, and the number average molecular weight of the alkenyl group is preferably from 300 to 10,000, and more preferably from 300 to 4000.
- m is a number from 2 to 10, and preferably a number from 2 to 4.
- the boron-modified products of the succinimide dispersants represented by the general formulas (4) and (5) are partly or entirely dehydrated with boric acid, respectively, in the amino groups indicated by the arrows in the general formulas (4) and (5).
- a condensed product having a boron atom content of 0.1 to 5% by mass is preferred.
- the alkenyl succinimide dispersant is produced by reacting an alkenyl succinic anhydride obtained by reacting a polyolefin and maleic anhydride with a polyalkylene polyamine.
- the commercial product is usually a mixture of the compound represented by the general formula (4) and the compound represented by the general formula (5), and the ratio thereof is the same as that of the alkenyl succinic anhydride used for producing the succinimide dispersant. It is determined by the charge ratio of polyalkylene polyamine. For this reason, in a commercial item, a thing with many compounds represented by General formula (4) is more mono alkenyl succinimide, and a thing with many compounds represented by General formula (5) is dialkenyl succinimide. There is a case. When the content of the component (D) is less than 0.5% by mass, the effect of inhibiting the decomposition of the component (A) may not be sufficiently obtained. When the content is more than 10% by mass, Physical properties may deteriorate.
- (E) component zinc dithiophosphate compound
- a lubricating oil for an internal combustion engine is blended with a zinc dithiophosphate compound for the purpose of preventing corrosion, improving load resistance, preventing wear, and the like. Since the decomposition of the component A) is suppressed, the zinc dithiophosphate compound represented by the following general formula (3) is used as the component (E) with respect to the total amount of the lubricating oil composition for an internal combustion engine of the present invention. It is preferable to contain 200 to 800 ppm by mass as atoms.
- R 9 to R 12 represent a hydrocarbon group having 6 to 18 carbon atoms
- R 9 to R 12 each represent a hydrocarbon group having 6 to 18 carbon atoms.
- the hydrocarbon group having 6 to 18 carbon atoms include hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, hexadecyl group and octadecyl group.
- Phenyl group methylphenyl group, dimethylphenyl group, isopropylphenyl group, trimethylphenyl group, ethylphenyl group, propylphenyl group, butylphenyl group, pentylphenyl group, hexylphenyl group, heptylphenyl group, octylphenyl group, nonylphenyl group , Decylphenyl group, undecylphenyl group, dodecylphenyl group, phenylphenyl group, benzylphenyl group, styrenated phenyl group, p-cumylphenyl group, dinonylphenyl group, ⁇ -naphthyl group, ⁇ -naphthyl group, etc.
- a cycloalkyl group having 6 to 18 carbon atoms such as a cyclohexyl group, a methylcycloheptyl group, a cyclopentenyl, a cyclohexenyl group, a cycloheptenyl group, a methylcyclopentenyl group, a methylcyclohexenyl group, a methylcycloheptenyl group, or the like.
- R 9 to R 12 are preferably an alkyl group having 6 to 14 carbon atoms, more preferably an alkyl group having 6 to 10 carbon atoms, since the effect of reducing friction and the effect of suppressing the decomposition of the component (A) are high. Most preferred are 6-8 alkyl groups, and among the alkyl groups, branched alkyl groups are preferred. R 9 to R 12 may be the same group or a combination of different groups. Specifically, R 9 to R 12 are preferably a 4-methyl-2-pentyl group, an octyl group or a 2-ethylhexyl group, and more preferably a 4-methyl-2-pentyl group.
- the content of the component (E) is less than 200 ppm by mass as phosphorus atoms, the effect of inhibiting the decomposition of the component (A) is not sufficiently obtained, and when it is more than 800 ppm by mass, the effect of increasing the amount corresponding to the blending amount cannot be obtained. Or, the exhaust gas purification catalyst may be poisoned or the decomposition of the component (A) may be accelerated.
- the content of the component (E) is more preferably 350 to 800 ppm by mass, and most preferably 500 to 800 ppm by mass.
- a zinc dialkyldithiophosphate having an alkyl group having 1 to 5 carbon atoms is usually used.
- the alkyl group has 1 carbon atom.
- the zinc dialkyldithiophosphate of 5 to 5 is preferably not contained because it reduces the effect of inhibiting the decomposition of the component (A) by the component (E), but even if it is contained, the phosphorus atom 100 of the component (C)
- the ratio of the phosphorus atom of the zinc dialkyldithiophosphate having 1 to 5 carbon atoms of the alkyl group with respect to part by mass is preferably 50 parts by mass or less, and more preferably 20 parts by mass or less.
- the total content of the component (E) and the zinc dialkyldithiophosphate having 1 to 5 carbon atoms in the alkyl group is 800 ppm by mass or less as phosphorus atoms. Preferably there is.
- antioxidants for lubricating oils for internal combustion engines amine-based antioxidants, phenol-based antioxidants, phenothiazine-based antioxidants, thioether-based antioxidants, phosphite-based antioxidants, etc. are used.
- the lubricating oil composition for an internal combustion engine of the present invention is composed of a group consisting of a phenolic antioxidant and an amine antioxidant as the component (F) because the decomposition of the component (A) is suppressed. It is preferable to contain at least one antioxidant in an amount of 0.1 to 1% by mass based on the total amount of the lubricating oil composition for an internal combustion engine of the present invention.
- phenolic antioxidants examples include 2,6-di-t-butylphenol, 2,6-di-t-butyl-p-cresol, 2,6-di-t-butyl-4-methylphenol, 2,6 -Di-t-butyl-4-ethylphenol, 2,4-dimethyl-6-t-butylphenol, 4,4'-methylenebis (2,6-di-t-butylphenol), 4,4'-bis (2 , 6-di-tert-butylphenol), 4,4′-bis (2-methyl-6-tert-butylphenol), 2,2′-methylenebis (4-methyl-6-tert-butylphenol), 2,2 ′ -Methylenebis (4-ethyl-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-cycl
- octyl 3- (4-hydroxy-3,5-di-t-butylphenyl) propionate, 3- (4-hydroxy-3,5-di-t-butylphenyl) propionate has excellent solubility in base oils and has a great effect of inhibiting the decomposition of component (A).
- 2-Ethylhexyl (4-hydroxy-3,5-di-t-butylphenyl) propionate is preferred.
- amine antioxidants include 1-naphthylamine, phenyl-1-naphthylamine, p-octylphenyl-1-naphthylamine, p-nonylphenyl-1-naphthylamine, p-dodecylphenyl-1-naphthylamine, and phenyl-2.
- Naphthylamine antioxidants such as naphthylamine; N, N′-diisopropyl-p-phenylenediamine, N, N′-diisobutyl-p-phenylenediamine, N, N′-diphenyl-p-phenylenediamine, N, N ′ -Di- ⁇ -naphthyl-p-phenylenediamine, N-phenyl-N'-isopropyl-p-phenylenediamine, N-cyclohexyl-N'-phenyl-p-phenylenediamine, N-1,3-dimethylbutyl-N '-Phenyl-p-phenylenediamine, dioctyl- -Phenylenediamine antioxidants such as phenylenediamine, phenylhexyl-p-phenylenediamine, phenyloctyl-p-phenylenediamine; dipy
- diphenylamine-based antioxidants are preferred because of their excellent antioxidant performance at high temperatures, and p, p'-dioctyldiphenylamine and p, p'-dinonyldiphenylamine are more preferred, and p, p'-dioctyldiphenylamine is preferred. Is even more preferred.
- the content of the component (F) is more preferably 0.15 to 0.95% by mass, and most preferably 0.2 to 0.9% by mass.
- the component (F) it is preferable to use a phenolic antioxidant, and it is more preferable to use a phenolic antioxidant and an amine antioxidant in combination.
- the antioxidant effect is increased, so that the amine antioxidant is 5 to 100 parts by mass with respect to 100 parts by mass of the phenolic antioxidant. It is preferably 10 to 70 parts by mass.
- the lubricating oil composition for an internal combustion engine of the present invention can further contain a lubricating additive usually used for a lubricating oil for an internal combustion engine.
- a lubricating additive usually used for a lubricating oil for an internal combustion engine.
- lubricant additives include (G1) phosphorus-based antiwear agents or phosphorus-based antioxidants, (G2) sulfur-based extreme pressure agents, (G3) sulfur-based antioxidants, and (G4) thiophosphate-based extreme pressures.
- Agents (G5) oiliness improvers, (G6) rust inhibitors, (G7) viscosity index improvers, (G8) metal deactivators, (G9) antifoaming agents, (G10) solid lubricants and the like. .
- Examples of phosphorus antiwear agents or phosphorus antioxidants include organic phosphines, organic phosphine oxides, organic phosphinites, organic phosphonites, organic phosphinates, organic phosphites, organic phosphonates, organic phosphates, and organic phosphoramidates. Etc.
- sulfur-based extreme pressure agents include sulfurized fats and oils, sulfurized mineral oils, organic mono- or polysulfides, polyolefin sulfides, 1,3,4-thiadiazole derivatives, thiuram disulfides, dithiocarbamic acid esters, and the like.
- Examples of (G3) sulfur-based antioxidants include thiodipropionic acid esters, thiobis (phenol) compounds, polyhydric alcohol esters of alkylthiopropionic acid, 2-mercaptobenzimidazole, dilauryl sulfide, amylthioglycolate, and the like. Can be mentioned.
- Examples of the (G4) thiophosphoric acid extreme pressure agent include organic trithiophosphites and organic thiophosphates.
- a preferable blending amount of the components (G1) to (G4) is about 0.1 to 20% by mass with respect to the total lubricating oil composition.
- the exhaust gas purification catalyst may be poisoned, it is preferable that the phosphorus content of the entire composition does not exceed 1000 mass ppm and the sulfur content does not exceed 5000 mass ppm.
- oilsiness improvers include fatty acids such as hexanoic acid, octanoic acid, pelargonic acid, decanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, behenic acid, linoleic acid, and linolenic acid; Linseed oil, Eno oil, Ochi deer oil, olive oil, cacao oil (oil is better), kapok oil, white mustard oil, sesame oil, rice bran oil, safflower oil, shea nut oil, cinnakiri oil, soybean oil, tea seed Oil, camellia oil, corn oil, rapeseed oil, palm oil, palm kernel oil, castor oil, sunflower oil, cottonseed oil, coconut oil, tree wax, peanut oil, horse fat, beef tallow, cow leg fat, cow tallow, pork tallow, goat Fats, sheep fats, milk fats, fish oils, whale oils and the like, or
- a preferred blending amount of the component (G5) is about 0.05 to 15% by mass with respect to the entire lubricating oil composition.
- the blending amount of the (EG) component is less than 0.05% by mass, a sufficient addition effect may not be obtained, and when it exceeds 15% by mass, an effect commensurate with the blending amount cannot be obtained, and the viscosity index and the like Viscosity characteristics may be reduced.
- Examples of the rust inhibitor of the component (G6) include oxidized paraffin wax calcium salt, oxidized paraffin wax magnesium salt, beef tallow fatty acid alkali metal salt, alkaline earth metal salt or amine salt, alkenyl succinic acid or alkenyl succinic acid half ester ( The molecular weight of the alkenyl group is about 100 to 300), sorbitan monoester, pentaerythritol monoester, glycerin monoester, nonylphenol ethoxylate, lanolin fatty acid ester, lanolin fatty acid calcium salt and the like.
- a preferable blending amount of the component (G6) is about 0.1 to 15% by mass with respect to the entire lubricating oil composition as a range in which the antirust effect is sufficiently exhibited.
- Examples of the viscosity index improver for the component (G7) include poly (C1-18) alkyl methacrylate, (C1-18) alkyl acrylate / (C1-18) alkyl methacrylate copolymer, diethylaminoethyl methacrylate / (C1-18).
- Alkyl methacrylate copolymer ethylene / (C1-18) alkyl methacrylate copolymer, polyisobutylene, polyalkylstyrene, ethylene / propylene copolymer, styrene / maleic ester copolymer, styrene / maleic amide copolymer Examples thereof include styrene / butadiene hydrogenated copolymer, styrene / isoprene hydrogenated copolymer, and the like.
- the average molecular weight is about 10,000 to 1,500,000.
- a preferred blending amount of the component (G7) is about 0.1 to 20% by mass with respect to the entire lubricating oil composition.
- Examples of the metal deactivator for the component (G8) include N, N′-salicylidene-1,2-propanediamine, alizarin, tetraalkylthiuram disulfide, benzotriazole, benzimidazole, 2-alkyldithiobenzimidazole, 2 -Alkyldithiobenzothiazole, 2- (N, N-dialkylthiocarbamoyl) benzothiazole, 2,5-bis (alkyldithio) -1,3,4-thiadiazole, 2,5-bis (N, N-dialkylthio) And carbamoyl) -1,3,4-thiadiazole.
- a preferable blending amount of the component (G8) is about 0.01 to 5% by mass with respect to the entire lubricating oil composition.
- antifoaming agent for component (G9) examples include polydimethyl silicone, trifluoropropylmethyl silicone, colloidal silica, polyalkyl acrylate, polyalkyl methacrylate, alcohol ethoxy / propoxylate, fatty acid ethoxy / propoxylate, and sorbitan partial fatty acid ester.
- Etc. A preferable blending amount of the component (G9) is about 1 to 1000 ppm by mass with respect to the entire lubricating oil composition.
- Examples of the solid lubricant of component (G10) include graphite, molybdenum disulfide, polytetrafluoroethylene, fatty acid alkaline earth metal salt, mica, cadmium dichloride, cadmium diiodide, calcium fluoride, lead iodide, Examples include lead oxide, titanium carbide, titanium nitride, aluminum silicate, antimony oxide, cerium fluoride, polyethylene, diamond powder, silicon nitride, boron nitride fluorocarbon, and melamine isocyanurate.
- a preferred blending amount of the component (E9) is about 0.005 to 2% by mass with respect to the entire lubricating oil composition. If the amount is less than 0.005% by mass, the effect of addition cannot be obtained. If the amount exceeds 2% by mass, the fluidity of the engine oil may be adversely affected.
- Each of the above components (G1) to (G10) can be appropriately combined with one or more components.
- the lubricating oil composition for an internal combustion engine of the present invention can be used as a lubricating oil for an internal combustion engine of any kind of internal combustion engine, and is particularly preferably used as an engine oil for a gasoline engine or a diesel engine.
- Lubricating oil compositions of Examples 1 to 25 and Comparative Examples 1 to 15 were prepared with the compositions shown in Tables 1 to 3 using the following.
- the numbers in the compositions of Tables 1 to 3 are parts by mass when the total amount is 100 parts by mass.
- the kinematic viscosity at 100 ° C. of each lubricating oil composition is 7.7 to 7.8 mm 2 / s, which corresponds to 0E-20 of SAE viscosity classification.
- Base oil 1 Total aromatic content 0.2%, sulfur content 1 ppm, 100 ° C. kinematic viscosity 4.2 mm 2 / s, viscosity index 124 paraffin-based refined mineral oil base oil 2: total aromatic content 17%, Refined mineral oil having a sulfur content of 1000 ppm, a kinematic viscosity at 100 ° C. of 4.4 mm 2 / s, and a viscosity index of 102
- the base oil used in Example 25 has an aromatic content of 0.39% and a sulfur content of 12.4 ppm.
- the aromatic content in the base oil used in Comparative Example 13 was 17%, the sulfur content was 1000 ppm, the aromatic content in the base oil used in Comparative Example 14 was 5.9%, the sulfur content was 342 ppm, and Comparative Example 15
- the base oil used has an aromatic content of 2.1% and a sulfur content of 115 ppm.
- A1 A compound in which R 1 to R 2 are 2-ethylhexyl groups, R 3 to R 4 are branched tridecyl groups, X 1 to X 2 are sulfur atoms, and X 3 to X 4 are oxygen atoms in the general formula (1) (Mo content 10%)
- A2 A compound in which R 1 to R 4 are butyl groups, X 1 to X 2 are sulfur atoms, and X 3 to X 4 are oxygen atoms in the general formula (1) (Mo content 27.4%)
- A3 a compound in which R 5 to R 8 are 2-ethylhexyl groups, X 5 to X 6 are sulfur atoms, and X 7 to X 8 are oxygen atoms in the general formula (2) (Mo content: 9.1%)
- B1 Tributyl borate (B content 4.7%)
- B2 Trioctyl borate (B content 2.7%)
- B3 Borated glycerin fatty acid ester of Example 1 (B
- C1 Calcium salicylate (Ca content 10%, TBN 280 mgKOH / g)
- C2 Calcium salicylate (Ca content 6.4%, TBN 165 mgKOH / g)
- C3 Boron-modified calcium salicylate (Ca content 10%, boron content 0.5%, TBN 275 mgKOH / g)
- C4 Calcium sulfonate (Ca content 11.4%, TBN 300 mgKOH / g)
- C5 Magnesium salicylate (Mg content 6.0%, TBN 280 mgKOH / g) C′1; barium sulfonate (Ba content: 6.8%, TBN: 10 mgKOH / g)
- D1 monoalkenyl succinimide
- D2 bisalkenyl succinimide
- D3 boron-modified alkenyl succinimide (boron content 0.34%)
- D'1 Mannich base dispersant
- E1 Compound in which R 9 to R 12 are 4-methyl-2-pentyl group in general formula (3) (phosphorus content 8.5%)
- E2 Compound in which R 9 to R 12 are octyl groups in the general formula (3) (phosphorus content 8.0%)
- E3 General formula (3) Compound R 9 ⁇ R 12 is a 2-ethylhexyl group in (phosphorus content 8.0%)
- E′1 Compound in which R 9 to R 12 are butyl groups in the general formula (3) (phosphorus content 12.7%)
- E′2 a compound in which R 9 to R 12 are 2-butyl groups in the general formula (3) (phosphorus content 12.9%)
- F1 3- (4-hydroxy-3,5-di-t-butylphenyl) propionic acid-2-ethylhexyl
- F′1 p, p′-dioctyldiphenylamine
- G6 polymethacrylate viscosity index improver
- Friction coefficient measurement conditions Tester used: SRV measurement tester (manufactured by Optimol, model: type3) Friction coefficient is measured under evaluation conditions, cylinder-on-plate line contact conditions. Load: 200N ⁇ Temperature: 80 °C ⁇ Measurement time: 15 minutes ⁇ Amplitude: 1 mm ⁇ Upper cylinder: ⁇ 15 ⁇ 22mm (Material SUJ-2) ⁇ Lower plate: ⁇ 24 ⁇ 6.85mm (Material SUJ-2) Evaluation method: Evaluated by an average value of a friction coefficient of 10 to 15 minutes. It shows that lubricity is so favorable that the numerical value of a friction coefficient is low. [Residual amount of organomolybdenum compound] The content of the organomolybdenum compound is quantified by liquid chromatography, and the ratio of the content after the test to the content before the test is calculated in 100 minutes.
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Abstract
Description
有機モリブデン化合物を配合したエンジン油は、使用初期においては優れた潤滑性を示す。しかし、エンジン油の劣化とともに潤滑性が低下し、長期間使用すると有機モリブデン化合物を配合していないエンジン油と同等の潤滑性しか示さなくなるという問題がある。このため、有機モリブデン化合物の分解を遅らせ、潤滑性を長期間維持できる組成物の開発が望まれている。有機モリブデン化合物の分解を遅らせるにはエンジン油の酸化防止性を向上させることが有効であり、芳香族成分の多い基油(例えば、特許文献4、5を参照)はパラフィン成分の多い基油よりも酸化防止性が高く、フェノール系酸化防止剤やアミン系酸化防止剤、亜鉛ジチオフォスフェート化合物等の酸化防止性を有する化合物を配合する方法(例えば、特許文献6~8を参照)が知られている。
本発明の内燃機関用潤滑油組成物の基油は芳香族成分が1質量%未満、且つ硫黄含有量が20質量ppm未満の炭化水素油である。本発明において、基油中の芳香族成分は、イギリス石油協会の規定によるIP346法に準拠して測定して得られる値であり、硫黄含有量はJISK2541-7に準拠して測定して得られる値である。
本発明の(A)成分は、一般式(1)で表される化合物及び一般式(2)で表される化合物からなる群から選択される少なくとも1つの有機モリブデン化合物である。(A)成分としては、分子中に排ガス浄化触媒の被毒の原因となるリン原子を含まず、耐熱性にも優れることから一般式(1)で表される化合物が好ましい。
一般式(1)で表される好ましい有機モリブデン化合物の例として、R1及びR2が2-エチルヘキシル、R3及びR4が分岐トリデシル基、X1~X2が硫黄原子でX3~X4が酸素原子である有機モリブデン化合物が挙げられる。
一般式(2)で表される好ましい有機モリブデン化合物の例として、R5~R8が2-エチルヘキシル、X5~X6が硫黄原子でX7~X8が酸素原子であるが挙げられる。
本発明の(B)成分は、ホウ酸エステル化合物である。ホウ酸エステル化合物としては、モノアルコールのホウ酸エステル、ホウ酸化脂肪族エポキシド、ホウ酸化グリセリン脂肪酸エステル、ホウ酸化アルコキシル化脂肪酸アミド等が挙げられ、(A)成分の分解抑制効果が大きいことから、ホウ酸化脂肪族エポキシド、ホウ酸化グリセリン脂肪酸エステルが好ましく、ホウ酸化グリセリン脂肪酸エステルが更に好ましい。
内燃機関用潤滑油用の金属系清浄剤としては、アルカリ土類金属スルホネート、アルカリ土類金属フェネート、アルカリ土類金属サリシレート、アルカリ土類金属ホスホネート等が使用されており、アルカリ土類金属としては、マグネシウム、カルシウム、バリウム等が挙げられる。本発明の内燃機関用潤滑油組成物は、(A)成分の分解が抑制されることから、(C)成分として、カルシウム系清浄剤及びマグネシウム系清浄剤からなる群から選択される少なくとも1つの金属系清浄剤を、カルシウム原子とマグネシウム原子の合計で、本発明の内燃機関用潤滑油組成物全量に対し、0.05~0.4質量%で含有することが好ましい。(C)成分としては、カルシウムフェネート、カルシウムサリシレート、カルシウムホスホネート、マグネシウムフェネート、マグネシウムサリシレート、マグネシウムホスホネート等が挙げられ、カルシウムサリシレート、カルシウムホスホネート、マグネシウムサリシレートが好ましく、カルシウムサリシレートが更に好ましい。金属系清浄剤は、通常、アルカリ土類金属の炭酸塩を配合することによりTBNを上げるが、本発明の(C)成分は、炭酸塩の一部がホウ酸塩で置換されていてもよい。
内燃機関用潤滑油は、一般に、スラッジの分散及び可溶化、スラッジ・デポジット(スラッジの分安定な前駆体)の可溶化等により、スラッジの堆積を防ぐために無灰型分散剤が配合されている。無灰型分散剤としては、アルケニル無水コハク酸とポリアミン化合物との縮合反応によって得られるコハク酸イミド型分散剤、アルケニル無水コハク酸とポリオール化合物との縮合反応によって得られるコハク酸エステル型分散剤、アルケニル無水コハク酸とアルカノールアミンとの縮合反応によって得られるコハク酸エステルアミド型分散剤、アルキルフェノールとポリアミンをホルムアルデヒドで縮合させて得られるマンニッヒ塩基系分散剤及びこれらのホウ酸変性物が挙げられる。本発明の内燃機関用潤滑油組成物は、(A)成分の分解が抑制できることから、(D)成分として、本発明の内燃機関用潤滑油組成物全量に対し、コハク酸イミド型分散剤を0.5~10質量%含有することが好ましい。コハク酸イミド型分散剤は、下記の一般式(4)又は(5)で表される化合物である。
内燃機関用潤滑油は、一般に、腐食防止、耐荷重性の向上、摩耗防止能等を目的として亜鉛ジチオフォスフェート化合物が配合されているが、本発明の内燃機関用潤滑油組成物は、(A)成分の分解が抑制されることから、(E)成分として、下記一般式(3)で表される亜鉛ジチオフォスフェート化合物を、本発明の内燃機関用潤滑油組成物全量に対し、リン原子として200~800質量ppm含有することが好ましい。
内燃機関用潤滑油用の酸化防止剤としては、アミン系酸化防止剤、フェノール系酸化防止剤、フェノチアジン系酸化防止剤、チオエーテル系酸化防止剤、亜リン酸エステル系酸化防止剤等が使用されているが、本発明の内燃機関用潤滑油組成物は、(A)成分の分解が抑制されることから、(F)成分として、フェノール系酸化防止剤及びアミン系酸化防止剤からなる群からなる少なくとも1つの酸化防止剤を本発明の内燃機関用潤滑油組成物全量に対し、0.1~1質量%で含有することが好ましい。
(G1)~(G4)成分の好ましい配合量は、その合計量が潤滑油組成物全体に対して0.1~20質量%程度である。但し、排ガス浄化触媒を被毒する場合があることから、組成物全体のリン含量が1000質量ppm、硫黄含有量が5000質量ppmをそれぞれ超えないことが好ましい。
ガラス製の反応器に、グリセリンモノオレイン酸エステル100g、ホウ酸11.7gを仕込み、攪拌しながら150℃まで昇温し、生成する水を除去しながら3時間、常圧でこれらを反応させた後、100hPaまで減圧して更に150℃で3時間反応を続けてホウ酸化グリセリン脂肪酸エステルを合成した。(ホウ素含量2.0%)
基油2:全芳香族含有量17%、硫黄分1000ppm、100℃動粘度4.4mm2/s、粘度指数102の精製鉱物油
比較例13で用いた基油における芳香族含量は17%、硫黄含有量が1000ppm、比較例14で用いた基油における芳香族含量が5.9%、硫黄含有量が342ppm、比較例15で用いた基油における芳香族含量が2.1%、硫黄含有量が115ppmである。
A2:一般式(1)において、R1~R4がブチル基、X1~X2が硫黄原子、X3~X4が酸素原子である化合物(Mo含量27.4%)
A3:一般式(2)において、R5~R8が2-エチルヘキシル基、X5~X6が硫黄原子、X7~X8が酸素原子である化合物(Mo含量9.1%、)
B1:ホウ酸トリブチル(B含量4.7%)
B2:ホウ酸トリオクチル(B含量2.7%)
B3:実施例1のホウ酸化グリセリン脂肪酸エステル(B含量2.0%)
C2:カルシウムサリシレート(Ca含量6.4%、TBN165mgKOH/g)
C3:ホウ素変性カルシウムサリシレート(Ca含量10%、ホウ素含量0.5%、TBN275mgKOH/g)
C4:カルシウムスルホネート(Ca含量11.4%、TBN300mgKOH/g)
C5:マグネシウムサリシレート(Mg含量6.0%、TBN280mgKOH/g)
C’1;バリウムスルホネート(Ba含量6.8%、TBN10mgKOH/g)
D1:モノアルケニルコハク酸イミド
D2:ビスアルケニルコハク酸イミド
D3:ホウ素変性アルケニルコハク酸イミド(ホウ素含量0.34%)
D’1:マンニッヒ塩基系分散剤
E2:一般式(3)においてR9~R12がオクチル基である化合物(リン含量8.0%)
E3:一般式(3)においてR9~R12が2-エチルヘキシル基である化合物(リン含量8.0%)
E’1:一般式(3)においてR9~R12がブチル基である化合物(リン含量12.7%)
E’2:一般式(3)においてR9~R12が2-ブチル基である化合物(リン含量12.9%)
F1:3-(4-ヒドロキシ-3,5-ジ-t-ブチルフェニル)プロピオン酸-2-エチルヘキシル
F’1:p,p’-ジオクチルジフェニルアミン
G6:ポリメタクリレート系粘度指数向上剤
試験方法:試料200mLを300mLガラス製メスシリンダーに入れ、150℃の恒温槽に入れ、試料中に流量10L/時の空気を吹き込んだ。試験前、並びに試験開始から5~8日後にサンプリングした試料について、下記の方法で摩擦係数及び(A)成分の残存率を測定した。結果を表1~3に示す。なお、表1~3において、残存率が「ND」は、残存率が5%未満であること、摩擦係数及び残存率が「-」は未測定であることを示す。
使用試験機:SRV測定試験機(Optimol社製、型式:type3)
評価条件
・シリンダ-オンプレートの線接触条件で摩擦係数を測定する
・荷重:200N
・温度:80℃
・測定時間:15分
・振幅:1mm
・上部シリンダー:φ15×22mm(材質SUJ-2)
・下部プレート:φ24×6.85mm(材質SUJ-2)
評価方法:10~15分の摩擦係数の平均値により評価する。摩擦係数の数値が低いほど潤滑性が良好であることを示す。
〔有機モリブデン化合物の残存量〕
液体クロマトグラフィーにより、有機モリブデン化合物の含有量を定量し、試験前の含有量に対する試験後の含有量の割合を100分率で算出する。
Claims (7)
- 芳香族成分が1質量%未満、且つ硫黄含有量が20質量ppm未満の炭化水素油である基油、(A)成分として下記の一般式(1)で表される化合物及び下記の一般式(2)で表される化合物からなる群から選択される少なくとも1つの有機モリブデン化合物を、モリブデン原子として300~1500質量ppm、及び(B)成分としてホウ酸エステル化合物を、ホウ素原子として100~1000質量ppmで含有する、内燃機関用潤滑油組成物。
- (A)成分由来のモリブデン原子に対する(B)成分由来のホウ素原子の質量比が0.2~2.2である、請求項1に記載の内燃機関用潤滑油組成物。
- 更に、(C)成分として、カルシウム系清浄剤及びマグネシウム系清浄剤からなる群から選択される少なくとも1つの金属系清浄剤を含有し、カルシウム原子とマグネシウム原子の含量の合計が0.05~0.4質量%である、請求項1又は2に記載の内燃機関用潤滑油組成物。
- 更に、(D)成分として、コハク酸イミド型分散剤を0.5~10質量%含有する、請求項1~3のいずれか1項に記載の内燃機関用潤滑油組成物。
- 更に、(F)成分として、フェノール系酸化防止剤及びアミン系酸化防止剤からなる群からなる少なくとも1つの酸化防止剤を0.1~1質量%含有する、請求項1~5のいずれか1項に記載の内燃機関用潤滑油組成物。
- 芳香族成分が1質量%未満、且つ硫黄含有量が20質量ppm未満の炭化水素油である基油及び下記の一般式(1)で表される化合物及び、下記の一般式(2)で表される化合物からなる群から選択される少なくとも1つの有機モリブデン化合物をモリブデン原子として300~1500質量ppmで含む内燃機関用潤滑油組成物に、ホウ酸エステル化合物を、ホウ素原子として100~1000質量ppmで添加することを含む、該有機モリブデン化合物の該潤滑油組成物中での安定性を向上させる方法。
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JP2018188549A (ja) * | 2017-05-02 | 2018-11-29 | Emgルブリカンツ合同会社 | 潤滑油組成物 |
JP2019147864A (ja) * | 2018-02-26 | 2019-09-05 | 出光興産株式会社 | 潤滑油組成物 |
WO2021200782A1 (ja) * | 2020-03-31 | 2021-10-07 | 出光興産株式会社 | 潤滑油組成物 |
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CA3029147A1 (en) | 2018-01-04 |
US10913917B2 (en) | 2021-02-09 |
EP3480284A4 (en) | 2020-03-04 |
JPWO2018003812A1 (ja) | 2019-04-18 |
EP3480284A1 (en) | 2019-05-08 |
CN109415647A (zh) | 2019-03-01 |
US20190203146A1 (en) | 2019-07-04 |
JP6979948B2 (ja) | 2021-12-15 |
KR20190022750A (ko) | 2019-03-06 |
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