WO2023189764A1 - Lubricating oil composition, flash point improver, and flash point improving method - Google Patents
Lubricating oil composition, flash point improver, and flash point improving method Download PDFInfo
- Publication number
- WO2023189764A1 WO2023189764A1 PCT/JP2023/010722 JP2023010722W WO2023189764A1 WO 2023189764 A1 WO2023189764 A1 WO 2023189764A1 JP 2023010722 W JP2023010722 W JP 2023010722W WO 2023189764 A1 WO2023189764 A1 WO 2023189764A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- antioxidant
- requirement
- lubricating oil
- base oil
- phosphorus
- Prior art date
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- 239000010687 lubricating oil Substances 0.000 title claims abstract description 97
- 239000000203 mixture Substances 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 52
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 116
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 116
- 239000002199 base oil Substances 0.000 claims abstract description 112
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 claims abstract description 94
- RUFPHBVGCFYCNW-UHFFFAOYSA-N 1-naphthylamine Chemical compound C1=CC=C2C(N)=CC=CC2=C1 RUFPHBVGCFYCNW-UHFFFAOYSA-N 0.000 claims abstract description 61
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 47
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 47
- 239000011574 phosphorus Substances 0.000 claims abstract description 47
- 239000013256 coordination polymer Substances 0.000 claims abstract description 19
- 239000002530 phenolic antioxidant Substances 0.000 claims description 67
- 230000001050 lubricating effect Effects 0.000 claims description 50
- 239000000314 lubricant Substances 0.000 claims description 41
- 125000000217 alkyl group Chemical group 0.000 claims description 30
- 125000004432 carbon atom Chemical group C* 0.000 claims description 30
- 150000001875 compounds Chemical class 0.000 claims description 25
- 239000003921 oil Substances 0.000 claims description 17
- 125000002947 alkylene group Chemical group 0.000 claims description 15
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 35
- 238000002156 mixing Methods 0.000 description 12
- 239000010725 compressor oil Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000010723 turbine oil Substances 0.000 description 6
- 239000000654 additive Substances 0.000 description 5
- 239000004615 ingredient Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000010696 ester oil Substances 0.000 description 4
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 description 4
- -1 n-propylene group Chemical group 0.000 description 4
- 125000002347 octyl 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])[H] 0.000 description 4
- 239000012188 paraffin wax Substances 0.000 description 4
- 239000010779 crude oil Substances 0.000 description 3
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 3
- 239000001993 wax Substances 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical group CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- GJDRKHHGPHLVNI-UHFFFAOYSA-N 2,6-ditert-butyl-4-(diethoxyphosphorylmethyl)phenol Chemical compound CCOP(=O)(OCC)CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 GJDRKHHGPHLVNI-UHFFFAOYSA-N 0.000 description 2
- UUNBFTCKFYBASS-UHFFFAOYSA-N C(CCCCCCC)C=1C(=C(C=CC1)NC1=CC=CC=C1)CCCCCCCC Chemical compound C(CCCCCCC)C=1C(=C(C=CC1)NC1=CC=CC=C1)CCCCCCCC UUNBFTCKFYBASS-UHFFFAOYSA-N 0.000 description 2
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 2
- 125000001204 arachidyl 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])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 125000002511 behenyl 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])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 2
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 125000002704 decyl group Chemical group [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])* 0.000 description 2
- 125000003438 dodecyl group Chemical group [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])* 0.000 description 2
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000012208 gear oil Substances 0.000 description 2
- 125000000755 henicosyl 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])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 2
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 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 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 125000002463 lignoceryl 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])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 2
- 125000002960 margaryl 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])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 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 2
- 125000001196 nonadecyl 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])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 125000001400 nonyl 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])[H] 0.000 description 2
- 125000000913 palmityl 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])C([H])([H])C([H])([H])[H] 0.000 description 2
- 125000002460 pentacosyl 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])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 2
- 125000002958 pentadecyl 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])C([H])([H])[H] 0.000 description 2
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000003209 petroleum derivative Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 125000004079 stearyl 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])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 2
- 125000002469 tricosyl 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])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 2
- 125000002889 tridecyl 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])[H] 0.000 description 2
- 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 2
- 230000000996 additive effect Effects 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004517 catalytic hydrocracking Methods 0.000 description 1
- 125000003901 ceryl 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])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 1
- 239000003599 detergent Substances 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000013022 formulation composition Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000006078 metal deactivator Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 125000002819 montanyl 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])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])C([H])([H])[H] 0.000 description 1
- 125000001802 myricyl 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])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])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000002465 nonacosyl 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])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])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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
- 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
- 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
- C10M129/68—Esters
- C10M129/76—Esters containing free hydroxy or carboxyl 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
- C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
- C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
- C10M133/04—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M133/12—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to a carbon atom of a six-membered aromatic ring
-
- 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
- C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
- C10M137/12—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having a phosphorus-to-carbon bond
Definitions
- the present invention relates to a lubricating oil composition, a flash point improver, and a method for improving the flash point. More specifically, the present invention relates to a lubricating oil composition, a lubricating oil base oil flash point improver, and a lubricating oil base oil flash point improving method.
- Patent Document 1 proposes a method of improving the flash point of an ester oil by mixing an ester oil with a flash point of 220° C. or higher and an antioxidant with a molecular weight of 300 or higher.
- the viscosity index is 120 or more
- the % CP by ring analysis (ndM method) is 85 or more
- the density at 15°C is 0.835 g/cm 3 or less
- the method proposed in Patent Document 1 is a method for improving the flash point of ester oil, and methods for improving the flash point of the above-mentioned paraffin-rich lubricating base oils have not been sufficiently studied. The current situation is that this has not been done.
- the present invention has a viscosity index of 120 or more, a % CP of 85 or more by ring analysis (ndM method), a density at 15°C of 0.835 g/cm 3 or less, and Provides a high flash point lubricating oil composition using a paraffin-rich lubricating base oil having a specific kinematic viscosity, a flash point improver for the lubricating base oil, and a method for improving the flash point of the lubricating base oil.
- the task is to do so.
- [1] Contains a lubricating base oil (X), a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C),
- the lubricating base oil (X) satisfies the following requirements (1) to (4), - Requirement (1): Viscosity index is 120 or more.
- - Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
- the content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio
- [2] Contains a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C),
- the content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio
- a lubricant base oil (X) that satisfies the following requirements (1) to (4) is blended with the flash point improver described in [2] above to reduce the ignition of the lubricant base oil (X).
- a method to improve the flash point of lubricant base oil - Requirement (1): Viscosity index is 120 or more.
- - Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- the viscosity index is 120 or more
- the % CP by ring analysis (ndM method) is 85 or more
- the density at 15°C is 0.835 g/cm 3 or less
- a high flash point lubricating oil composition using a paraffin-rich lubricating base oil having a specific kinematic viscosity, a flash point improver for the lubricating base oil, and a method for improving the flash point of the lubricating base oil. It becomes possible to do so.
- the lubricating oil composition of this embodiment includes a lubricating base oil (X), a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C). Contains.
- the lubricating base oil (X) satisfies the following requirements (1) to (4).
- - Requirement (1) Viscosity index is 120 or more.
- Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
- the content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio.
- the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0.15 or less in mass ratio.
- the present inventor conducted extensive studies in order to solve the above problems. As a result, it has been found that the following (I) to (III) are important in improving the flash point of the lubricant base oil (X).
- (I) Using a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C) in combination.
- the content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio.
- the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0.15 or less in mass ratio.
- the mechanism by which the flash point of the lubricant base oil (X) is improved is not clear, but for example, by satisfying (I) to (III) above, diphenylamine antioxidant (A) and naphthylamine This is due to some kind of interaction between the antioxidant (B) and the phosphorus-containing phenolic antioxidant (C), which has some effect on the flash point of the lubricant base oil (X). It is inferred.
- lubricating base oil (X)," “diphenylamine antioxidant (A),” “naphthylamine antioxidant (B),” and “phosphorus-containing phenolic antioxidant (C)” will be used.
- X lubricating base oil
- component (A) lubricating base oil
- B naphthylamine antioxidant
- C phosphorus-containing phenolic antioxidant
- the lubricating oil composition of this embodiment may be composed only of "component (X),""component(A),”"component(B),” and “component (C),” but the present invention Even if it contains other ingredients than "ingredient (X),""ingredient(A),”"ingredient(B),” and “ingredient (C)” as long as it does not deviate from the spirit of good.
- the total content of "component (X)", “component (A)”, “component (B)”, and “component (C)” is the total amount of the lubricating oil composition. Based on the standard, it is preferably 80% by mass or more, more preferably 85% by mass or more, and still more preferably 90% by mass or more.
- the kinematic viscosity at 40°C specified in requirement (4) (hereinafter also referred to as "40°C kinematic viscosity") and the viscosity index specified in requirement (1) are based on JIS K2283:2000. means the value measured and calculated.
- %C P defined in requirement (2) means a value calculated by ring analysis (ndM method) in accordance with ASTM D3238:1995.
- the density at 15°C specified in requirement (3) is determined in accordance with JIS K 2249-1:2011 (Crude oil and petroleum products - How to determine density - Part 1: Vibration method). means the value to be measured.
- the lubricating oil base oil (X) is obtained by, for example, distilling a paraffinic crude oil under atmospheric pressure to obtain an atmospheric residual oil, and further distilling the distillate under reduced pressure, and then hydrocracking the distillate to obtain a bottom oil.
- Examples include base oils obtained by subjecting the bottom oil to at least one of hydroisomerization dewaxing and hydrorefining.
- base oils etc. are obtained by subjecting at least one of hydroisomerization dewaxing and hydrorefining to one or more feedstock oils selected from high-wax distillate oils, slack waxes, and GTL waxes. can also be mentioned.
- These base oils may be used alone or in combination of two or more.
- it is sufficient that the mixed base oil satisfies requirements (1) to (4).
- the density at 15°C specified in requirement (3) is preferably 0.835 g/cm 3 or less, more preferably 0.832 g/cm 3 or less. , more preferably 0.830 g/cm 3 or less, even more preferably 0.828 g/cm 3 or less. Moreover, preferably it is 0.815 g/cm 3 or more.
- the kinematic viscosity at 40°C specified in requirement (4) (also referred to as "40°C kinematic viscosity”) is preferably 30.0 mm 2 /s or more, more preferably 35.0 mm 2 /s or more, still more preferably 41.4 mm 2 /s or more.
- the speed is preferably 50.6 mm 2 /s or less, more preferably 48.0 mm 2 /s or less, and still more preferably 46.0 mm 2 /s or less.
- the upper limit of the viscosity index specified in requirement (1) is not particularly limited, but is, for example, 180 or less.
- % CP defined in requirement (2) is 85 or more, preferably 87 or more, more preferably 90 or more, and the upper limit thereof is not particularly limited, but is, for example, 100 or less.
- the flash point of the lubricating base oil (X) is usually 230°C or higher, preferably 235°C or higher, more preferably 240°C or higher, even more preferably 245°C or higher.
- the flash point refers to a value measured by the Open Cleveland (COC) method in accordance with JIS K2265-4:2007.
- the content of the lubricating oil base oil (X) is preferably 90.0% by mass or more, more preferably 93.0% by mass or more, based on the total amount of the lubricating oil composition. More preferably, it is 95.0% by mass or more. Moreover, it is preferably 99.7% by mass or less.
- the lubricant composition of this embodiment may further contain a lubricant base oil (X') that does not correspond to the lubricant base oil (X).
- the lubricating oil base oil (X') is made from mineral oils that do not meet at least one of requirements (1) to (4) and synthetic oils that do not meet at least one of requirements (1) to (4).
- the content of the lubricating base oil (X') is preferably less than 50 parts by mass, more preferably less than 30% by mass, even more preferably 10 parts by mass, based on 100 parts by mass of the lubricating base oil (X). Less than 1 part by weight, even more preferably less than 1 part by weight, even more preferably less than 0.1 part by weight.
- the lubricating oil composition of this embodiment contains a diphenylamine antioxidant (A). If the diphenylamine antioxidant (A) is not contained, the effects of the present invention will not be exhibited.
- diphenylamine antioxidant (A) a diphenylamine antioxidant commonly used as an antioxidant for lubricating oil compositions can be used.
- the diphenylamine antioxidant (A) may be used alone or in combination of two or more.
- the diphenylamine antioxidant (A) is a compound (A1) represented by the following general formula (a1) from the viewpoint of easily improving the effects of the present invention. It is preferable to include.
- the content of the compound (A1) in the diphenylamine antioxidant (A) is preferably 50% by mass to 100% by mass, more preferably 50% by mass based on the total amount of the diphenylamine antioxidant (A).
- R a1 and R a2 are each independently an alkyl group having 1 to 30 carbon atoms.
- the number of carbon atoms in the alkyl group that can be selected as R a1 and R a2 is preferably 1 to 20, more preferably 4 to 16, still more preferably 4, from the viewpoint of improving the effects of the present invention. ⁇ 14.
- alkyl groups that can be selected as R a1 and R a2 include methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, Dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group, henicosyl group, docosyl group, tricosyl group, tetracosyl group, pentacosyl group, hexacosyl group, heptacyl group, octacosyl group , nonacosyl group, triacontyl group, etc. These may be linear or branched.
- na1 and na2 are each independently an integer of 1 to 5.
- na1 and na2 are each independently preferably from 1 to 3, more preferably from 1 to 2, still more preferably from 1, from the viewpoint of making it easier to improve the effects of the present invention.
- One type of compound (A1) may be used alone, or two or more types may be used in combination.
- the lubricating oil composition of this embodiment contains a naphthylamine antioxidant (B). If the naphthylamine antioxidant (B) is not contained, the effects of the present invention will not be exhibited.
- the naphthylamine antioxidant (B) a naphthylamine antioxidant commonly used as an antioxidant for lubricating oil compositions can be used.
- the naphthylamine antioxidant (B) may be used alone or in combination of two or more.
- the naphthylamine antioxidant (B) is a compound (B1) represented by the following general formula (b1) from the viewpoint of easily improving the effects of the present invention. It is preferable to include. From the same point of view, the content of compound (B1) in the naphthylamine antioxidant (B) is preferably 50% by mass to 100% by mass, more preferably 60% by mass to 100% by mass, more preferably 70% to 100% by mass, even more preferably 80% to 100% by mass, even more preferably 90% to 100% by mass, even more preferably 95% by mass to It is 100% by mass.
- R b1 is an alkyl group having 1 to 30 carbon atoms.
- the number of carbon atoms in the alkyl group that can be selected as R b1 is preferably 1 to 20, more preferably 4 to 16, still more preferably 4 to 14, from the viewpoint of improving the effects of the present invention. be.
- Specific examples of the alkyl group that can be selected as R b1 include those exemplified as the alkyl groups that can be selected as R a1 and R a2 .
- the alkyl group may be linear or branched.
- nb1 is an integer of 1 to 5.
- nb1 is preferably 1 to 3, more preferably 1 to 2, and still more preferably 1 from the viewpoint of making it easier to improve the effects of the present invention.
- One type of compound (B1) may be used alone, or two or more types may be used in combination.
- the lubricating oil composition of this embodiment contains a phosphorus-containing phenolic antioxidant (C). If the phosphorus-containing phenolic antioxidant (C) is not contained, the effects of the present invention will not be exhibited.
- phosphorus-containing phenolic antioxidant a phosphorus-containing phenolic antioxidant that is commonly used as an antioxidant for lubricating oil compositions can be used.
- the phosphorus-containing phenolic antioxidant (C) may be used alone or in combination of two or more.
- the phosphorus-containing phenolic antioxidant (C) is a compound represented by the following general formula (c1) (C1 ) is preferably included.
- the content of the compound (C1) in the phosphorus-containing phenolic antioxidant (C) is preferably 50% by mass to 100% by mass based on the total amount of the phosphorus-containing phenolic antioxidant (C). , more preferably 60% to 100% by weight, even more preferably 70% to 100% by weight, even more preferably 80% to 100% by weight, even more preferably 90% to 100% by weight, even more preferably It is 95% by mass to 100% by mass.
- R c1 , R c2 , R c3 and R c4 are each independently a hydrogen atom or an alkyl group having 1 to 30 carbon atoms.
- the alkyl group has 1 to 30 carbon atoms, the effects of the present invention are more likely to be improved.
- Examples of the alkyl groups that can be selected as R c1 , R c2 , R c3 , and R c4 include the same alkyl groups that can be selected as R a1 and R a2 described above.
- the number of carbon atoms in the alkyl groups that can be selected as R c1 , R c2 , R c3 , and R c4 is preferably 1 to 20, preferably 1 to 20, and preferably 1 to 20, from the viewpoint of improving the effects of the present invention.
- the number is preferably 1 to 10, more preferably 1 to 6.
- the compound (C1) preferably has a hindered phenol skeleton from the viewpoint of further improving the effects of the present invention. Therefore, the alkyl group that can be selected as R c1 and R c2 is preferably a branched alkyl group, more preferably a branched alkyl group having 1 to 6 carbon atoms, and preferably a tert-butyl group. More preferred.
- R c5 is an alkylene group having 1 to 5 carbon atoms.
- the number of carbon atoms in the alkylene group that can be selected as R c5 is preferably 1 to 4, more preferably 1 to 3, still more preferably 1 to 2, and even more preferably It is 1.
- Specific examples of alkylene groups that can be selected as R c5 include linear alkylene groups such as methylene group, ethylene group, n-propylene group, n-butylene group, and n-pentylene group; isopropylene group, isobutylene group, Examples include branched alkylene groups such as sec-butylene, tert-butylene, isopentylene, and neopentylene. Among these, methylene group is preferred.
- One type of compound (C1) may be used alone, or two or more types may be used in combination.
- the lubricating oil composition of this embodiment further contains a phosphorus-free phenolic antioxidant (D) from the viewpoint of making it easier to improve the effects of the present invention.
- phosphorus-free phenolic antioxidant (D) a phosphorus-free phenolic antioxidant commonly used as an antioxidant for lubricating oil compositions can be used.
- the phosphorus-free phenolic antioxidant (D) may be used alone or in combination of two or more.
- the phosphorus-free phenolic antioxidant (D) is a compound represented by the following general formula (d1) from the viewpoint of further improving the effects of the present invention. It is preferable that (D1) is included. From the same point of view, the content of the compound (D1) in the phosphorus-free phenolic antioxidant (D) is preferably 50% by mass to 100% by mass based on the total amount of the phosphorus-containing phenolic antioxidant (D). %, more preferably 60% to 100% by weight, even more preferably 70% to 100% by weight, even more preferably 80% to 100% by weight, even more preferably 90% to 100% by weight, even more preferably is 95% to 100% by mass.
- R d1 is an alkylene group having 1 to 5 carbon atoms.
- the number of carbon atoms in the alkylene group that can be selected as R d1 is preferably 1 to 4, more preferably 1 to 3, and even more preferably 1 to 2, from the viewpoint of improving the effects of the present invention.
- R d2 is an alkyl group having 1 to 25 carbon atoms.
- the number of carbon atoms in the alkyl group that can be selected as R d2 is preferably 2 or more, more preferably 4 or more, still more preferably 6 or more, from the viewpoint of improving the effects of the present invention. Further, it is preferably 20 or less, more preferably 15 or less, even more preferably 10 or less. The upper and lower limits of these numerical ranges can be arbitrarily combined. Specifically, it is preferably 2 to 20, more preferably 4 to 15, and still more preferably 6 to 10.
- alkyl groups that can be selected as R d2 include methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, Examples include tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group, henicosyl group, docosyl group, tricosyl group, tetracosyl group, pentacosyl group, and the like. These may be linear or branched.
- One type of compound (D1) may be used alone, or two or more types may be used in combination.
- the content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio. It is required that If [(B)/(A)] is less than 2.0, the effects of the present invention will not be exhibited.
- [(B)/(A)] is preferably 2.1 or more, more preferably 2.2 or more, and still more preferably 2. .3 or more.
- it is preferably 3.5 or less, more preferably 3.2 or less, and even more preferably 3.0 or less.
- the upper and lower limits of these numerical ranges can be arbitrarily combined. Specifically, it is preferably 2.1 to 3.5, more preferably 2.2 to 3.2, and even more preferably 2.3 to 3.0.
- the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0. Must be 15 or less.
- [(C)/(B)] is more than 0.15, the effects of the present invention are no longer exhibited.
- [(C)/(B)] is preferably 0.14 or less, more preferably 0.12 or less, and even more preferably 0. .10 or less.
- it is preferably 0.03 or more, more preferably 0.04 or more, and still more preferably 0.05 or more.
- the upper and lower limits of these numerical ranges can be arbitrarily combined. Specifically, it is preferably 0.03 to 0.14, more preferably 0.04 to 0.12, and still more preferably 0.05 to 0.10.
- the total content of the diphenylamine antioxidant (A), the naphthylamine antioxidant (B), and the phosphorus-containing phenolic antioxidant (C) is the same as that of the lubricating oil composition. Based on the total amount, it is preferably 0.30% by mass or more. When the total content is within this range, the effects of the present invention can be easily improved.
- the total content is preferably 0.60% by mass or more, more preferably 0.80% by mass or more, and even more preferably 1.0% by mass or more. It is.
- component (A), component (B), and component (C) preferably 5.0% by mass or less, more preferably 4.0% by mass or less. It is 0% by mass or less, more preferably 3.0% by mass or less.
- the upper and lower limits of these numerical ranges can be arbitrarily combined. Specifically, it is preferably 0.60% by mass to 5.0% by mass, more preferably 0.80% by mass to 4.0% by mass, and even more preferably 1.0% by mass to 3.0% by mass. .
- the content of the diphenylamine antioxidant (A) is preferably 0.08% based on the total amount of the lubricating oil composition, from the viewpoint of making it easier to improve the effects of the present invention.
- the content is from 1.5% by weight, more preferably from 0.10% to 1.0% by weight, even more preferably from 0.20% to 0.80% by weight.
- the content of the naphthylamine antioxidant (B) is preferably 0.22% based on the total amount of the lubricating oil composition, from the viewpoint of making it easier to improve the effects of the present invention.
- the amount is from 3.1% by weight, more preferably from 0.40% to 2.5% by weight, and even more preferably from 0.60% to 2.0% by weight.
- the content of the phosphorus-containing phenolic antioxidant (C) is preferably 0 on the basis of the total amount of the lubricating oil composition, from the viewpoint of making it easier to improve the effects of the present invention. 0.005% to 0.40% by weight, more preferably 0.010% to 0.30% by weight, even more preferably 0.015% to 0.20% by weight.
- the content of the phosphorus-free phenolic antioxidant (D) can more easily improve the effects of the present invention. From the viewpoint of % to 3.0% by mass.
- the lubricating oil composition of the present embodiment contains a phosphorus-free phenolic antioxidant (D), a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant
- the content of the phosphorus-free phenolic antioxidant (D) relative to the total content with (C) [(D)/ ⁇ (A)+(B)+(C) ⁇ ] is expressed as a mass ratio, preferably It is 0.50 to 10.0, more preferably 0.70 to 8.0, and even more preferably 0.80 to 6.0.
- the lubricating oil composition of the present embodiment may contain lubricating oil additives other than components (A) to (D) to the extent that the effects of the present invention are not impaired.
- lubricating oil additives include extreme pressure agents, detergent dispersants, pour point depressants, viscosity index improvers, rust inhibitors, metal deactivators, antifoaming agents, and friction modifiers. It will be done. These lubricating oil additives may be used alone or in combination of two or more.
- the lubricating oil composition of the present embodiment has a flash point of preferably 250°C or higher, more preferably 260°C or higher, even more preferably 270°C or higher, even more preferably 280°C or higher.
- the flash point refers to a value measured by the Open Cleveland (COC) method in accordance with JIS K2265-4:2007.
- the method for producing the lubricating oil composition of this embodiment is not particularly limited.
- the method for producing a lubricating oil composition of the present embodiment includes a lubricating oil base oil (X), a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant. including the step of mixing with the agent (C),
- the lubricating base oil (X) satisfies the following requirements (1) to (4), - Requirement (1): Viscosity index is 120 or more.
- - Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- - Requirement (3) Density at 15°C is 0.835 g/cm 3 or less.
- the content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is adjusted to be 2.0 or more in mass ratio;
- a step of adjusting the content ratio [(C)/(B)] of the contained phenolic antioxidant (C) and the naphthylamine antioxidant (B) to be 0.15 or less in terms of mass ratio. include.
- the production method may further include a step of blending a phosphorus-free phenolic antioxidant (D), if necessary.
- the manufacturing method may further include a step of blending the above-mentioned lubricating oil additive, if necessary.
- the method of mixing each component is not particularly limited, but for example, a method of blending each component into the lubricating base oil (X) can be mentioned. Further, each component may be mixed in the form of a solution (dispersion) by adding diluting oil or the like. After blending each component, it is preferable to stir and disperse uniformly by a known method.
- lubricating base oil (X), component (A), component (B), component (C), and component (D) are as described above.
- the blending amounts and blending ratios of the lubricant base oil (X), component (A), component (B), component (C), and component (D) are as described above for the lubricant base oil (X), component ( It is preferable to set the blending amount and blending ratio corresponding to the preferred content and content ratio of A), component (B), component (C), and component (D).
- the lubricating oil composition of this embodiment is preferably used as an industrial equipment oil.
- the industrial equipment oil preferably includes hydraulic oil; turbine oil; compressor oil such as rotary air compressor oil and reciprocating air compressor oil; machine tool oil; gear oil, etc., and more preferably turbine oil.
- Oil examples include compressor oils such as rotary air compressor oil and reciprocating air compressor oil, and more preferably turbine oil. Therefore, this embodiment provides a method of using the lubricating oil composition as a hydraulic oil, turbine oil, compressor oil, machine tool oil, or gear oil. Moreover, in this embodiment, a method of using the above-mentioned lubricating oil composition as turbine oil or compressor oil is provided. Furthermore, the present embodiment provides a method of using the lubricating oil composition as a turbine oil.
- flash point improver the following flash point improver for lubricant base oil is also provided.
- a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C) The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio,
- the content ratio [(C)/(B)] of phosphorus-containing phenolic antioxidant (C) and naphthylamine antioxidant (B) is 0.15 or less in mass ratio flash point improver.
- the above flash point improver for lubricating base oil preferably further contains a phosphorus-free phenolic antioxidant (D) from the viewpoint of making it easier to improve the flash point of the lubricating base oil.
- D phosphorus-free phenolic antioxidant
- the flash point improver for lubricating base oils described above is particularly suitable for improving the flash point of lubricating base oils (X) that satisfy the following requirements (1) to (4).
- - Requirement (1) Viscosity index is 120 or more.
- - Requirement (2) % CP by ring analysis (ndM method) is 85 or more.
- - Requirement (3) Density at 15°C is 0.835 g/cm 3 or less.
- lubricant base oil (X), component (A), component (B), component (C), and component (D) are , as described above.
- preferred content ratios of lubricant base oil (X), component (A), component (B), component (C), and component (D) is as described above.
- the flash point of the lubricant base oil (X) whose flash point is in the range of 235°C or higher (preferably 240°C or higher) can be improved.
- the flash point improver described above is blended into the lubricating base oil (X) that satisfies the following requirements (1) to (4) to improve the flash point of the lubricating base oil (X).
- a method for improving the flash point of a lubricating base oil is provided.
- - Requirement (1) Viscosity index is 120 or more.
- - Requirement (2) % CP by ring analysis (ndM method) is 85 or more.
- preferred embodiments of the lubricating base oil (X), component (A), component (B), component (C), and component (D) are as follows: As mentioned above.
- the preferred content ratios of lubricant base oil (X), component (A), component (B), component (C), and component (D) are , as described above.
- the flash point of lubricant base oil (X) having a flash point in the range of 235°C or higher is preferably It can be improved by 10°C or more, more preferably by 15°C or more.
- composition Further, in this embodiment, the following composition is also provided. Contains a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C), The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio, A composition in which the content ratio [(C)/(B)] of a phosphorus-containing phenolic antioxidant (C) and a naphthylamine antioxidant (B) is 0.15 or less in mass ratio.
- lubricating base oil (X), component (A), component (B), component (C), and component (D) are as described above.
- the preferable content ratios of the lubricating base oil (X), component (A), component (B), component (C), and component (D) are as described above.
- this embodiment also provides a method for improving the flash point of lubricating base oil (X) using the above composition.
- this embodiment also provides the use of the above composition for improving the flash point of a lubricating base oil (X).
- the flash point of the lubricating base oil (X) whose flash point is in the range of 235°C or higher (preferably 240°C or higher), preferably 10°C or higher, more preferably can be improved by 15°C or more.
- [1] Contains a lubricating base oil (X), a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C),
- the lubricating base oil (X) satisfies the following requirements (1) to (4), - Requirement (1): Viscosity index is 120 or more.
- - Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
- the content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio
- a lubricating oil composition in which the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0.15 or less in mass ratio.
- R a1 and R a2 are each independently an alkyl group having 1 to 30 carbon atoms. na1 and na2 are each independently an integer of 1 to 5.
- B naphthylamine antioxidant
- R b1 is an alkyl group having 1 to 30 carbon atoms.
- nb1 is an integer from 1 to 5.
- [8] Contains a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C),
- the content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio
- Flash point improver for oil [9]
- the lubricant base oil is a lubricant base oil (X) that satisfies the following requirements (1) to (4), and for use in the lubricant base oil (X), the above-mentioned [8] or The flash point improver according to [9].
- - Requirement (1) Viscosity index is 120 or more.
- - Requirement (2) % CP by ring analysis (ndM method) is 85 or more.
- the lubricating oil base oil (X) that satisfies the following requirements (1) to (4) is blended with the flash point improver according to any one of the above [8] to [10], and the lubricating oil A method for improving the flash point of a lubricant base oil, which improves the flash point of a base oil (X).
- - Requirement (1) Viscosity index is 120 or more.
- - Requirement (2) % CP by ring analysis (ndM method) is 85 or more.
- Examples 1-7, Comparative Examples 1-2, Reference Examples 1-3 The following components were mixed to prepare lubricating oil compositions having the compositions shown in Tables 2 to 4. In addition, the numerical unit of the formulation composition in Tables 2 to 4 is "mass %".
- lubricant base oil (X1) and lubricant base oil (X2) which are base oils belonging to Group III of API (American Petroleum Institute) and have the properties shown in Table 1, were used.
- Table 1 also shows the properties of the mixed base oil of the lubricating base oil (X1) and the lubricating base oil (X2) used in Reference Example 2.
- Table 1 also shows the properties of the lubricating base oil (X') used in Reference Example 3.
- the lubricant base oil (X') is a base oil belonging to API (American Petroleum Institute) Group II.
- Dioctyldiphenylamine was used.
- Diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate was used. Diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate has the general formula (c1), in which R c1 and R c2 are tert-butyl groups, R c3 and R c4 are ethyl groups, R c5 is a methylene group and corresponds to compound (C1).
- Benzenepropanoic acid-3,5-bis(1,1-dimethylethyl)-4-hydroxyalkyl ester was used.
- Benzenepropanoic acid-3,5-bis(1,1-dimethylethyl)-4-hydroxyalkyl ester has the general formula (d1), where R d1 is an alkylene group having 2 carbon atoms, and R d2 is an alkyl group having 8 carbon atoms. group, and corresponds to compound (D1).
- the flash points of the lubricant base oils of Reference Examples 1 to 3 were measured.
- the flash point was measured by the Open Cleveland (COC) method in accordance with JIS K2265-4:2007.
- the flash points of the lubricating oil compositions of Examples 1 to 7 and Comparative Examples 1 and 2 were measured in the same manner.
- the increase in flash point relative to the flash point of the lubricating base oil (X) of Reference Example 1 was calculated.
- the increase in flash point relative to the flash point of the lubricating base oil (X) of Reference Example 2 was calculated.
- Table 2 shows that the lubricating oil compositions of Examples 1 to 3 have flash points improved by 10° C. or more from the lubricating oil base oil of Reference Example 1, which is the standard.
- the content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) was as follows: 2.0, and the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is more than 0.15 in mass ratio. Therefore, it can be seen that the flash point has not been sufficiently improved from the lubricating base oil of Reference Example 1, which is the standard.
- the lubricating oil compositions of Examples 4 to 7 have flash points improved by 10° C. or more from the lubricating oil base oil of Reference Example 2, which is the standard.
- the lubricating oil composition of Comparative Example 2 has the same antioxidant composition as the lubricating oil composition of Example 7, the lubricating oil base oil of Reference Example 3, which is the standard, It can be seen that the flash point has not been sufficiently improved.
Abstract
This lubricating oil composition contains a lubricating oil base oil (X), a diphenylamine-based antioxidant (A), a naphthylamine-based antioxidant (B), and a phosphorus-containing phenol-based antioxidant (C). The lubricating oil base oil (X) satisfies requirements (1)-(4).
· Requirement (1): Having a viscosity index of 120 or more.
· Requirement (2): Having a %CP of 85 or more as determined through ring analysis (n-d-M method). · Requirement (3): Having a density, at 15°C, of 0.835 g/cm3 or less. · Requirement (4): Having a kinematic viscosity, at 40°C, of 28.8 mm2/s or more. The content ratio [(B)/(A)] of the naphthylamine-based antioxidant (B) to the diphenylamine-based antioxidant (A) is 2.0 or more in mass ratio. The content ratio [(C)/(B)] of the phosphorus-containing phenol-based antioxidant (C) to the naphthylamine-based antioxidant (B) is 0.15 or less in mass ratio.
Description
本発明は、潤滑油組成物並びに引火点向上剤及び引火点向上方法に関する。より詳細には、本発明は、潤滑油組成物並びに潤滑油基油の引火点向上剤及び潤滑油基油の引火点向上方法に関する。
The present invention relates to a lubricating oil composition, a flash point improver, and a method for improving the flash point. More specifically, the present invention relates to a lubricating oil composition, a lubricating oil base oil flash point improver, and a lubricating oil base oil flash point improving method.
安全性向上の観点から、油類の引火点を向上させる方法が従来各種提案されている。
例えば、特許文献１では、引火点が２２０℃以上のエステル油と、分子量が３００以上の酸化防止剤とを混合することで、当該エステル油の引火点を向上させる方法が提案されている。 From the viewpoint of improving safety, various methods have been proposed to improve the flash point of oils.
For example, Patent Document 1 proposes a method of improving the flash point of an ester oil by mixing an ester oil with a flash point of 220° C. or higher and an antioxidant with a molecular weight of 300 or higher.
例えば、特許文献１では、引火点が２２０℃以上のエステル油と、分子量が３００以上の酸化防止剤とを混合することで、当該エステル油の引火点を向上させる方法が提案されている。 From the viewpoint of improving safety, various methods have been proposed to improve the flash point of oils.
For example, Patent Document 1 proposes a method of improving the flash point of an ester oil by mixing an ester oil with a flash point of 220° C. or higher and an antioxidant with a molecular weight of 300 or higher.
ところで、引火点の向上は、エステル油のみならず、他の油類についても求められ得る。
本発明者は、粘度指数が１２０以上であり、環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上であり、１５℃における密度が０．８３５ｇ／ｃｍ３以下であり、かつ特定の動粘度を有する、パラフィンリッチな潤滑油基油について、引火点を向上させるべく、鋭意検討を行った。
しかしながら、特許文献１において提案されている方法は、エステル油を対象にした引火点の向上方法であり、上記のようなパラフィンリッチな潤滑油基油について、引火点を向上させる方法が十分に検討されていないのが現状である。 Incidentally, improvement in flash point can be sought not only for ester oils but also for other oils.
The present inventor has determined that the viscosity index is 120 or more, the % CP by ring analysis (ndM method) is 85 or more, the density at 15°C is 0.835 g/cm 3 or less, and In order to improve the flash point of a paraffin-rich lubricating base oil with a kinematic viscosity of .
However, the method proposed in Patent Document 1 is a method for improving the flash point of ester oil, and methods for improving the flash point of the above-mentioned paraffin-rich lubricating base oils have not been sufficiently studied. The current situation is that this has not been done.
本発明者は、粘度指数が１２０以上であり、環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上であり、１５℃における密度が０．８３５ｇ／ｃｍ３以下であり、かつ特定の動粘度を有する、パラフィンリッチな潤滑油基油について、引火点を向上させるべく、鋭意検討を行った。
しかしながら、特許文献１において提案されている方法は、エステル油を対象にした引火点の向上方法であり、上記のようなパラフィンリッチな潤滑油基油について、引火点を向上させる方法が十分に検討されていないのが現状である。 Incidentally, improvement in flash point can be sought not only for ester oils but also for other oils.
The present inventor has determined that the viscosity index is 120 or more, the % CP by ring analysis (ndM method) is 85 or more, the density at 15°C is 0.835 g/cm 3 or less, and In order to improve the flash point of a paraffin-rich lubricating base oil with a kinematic viscosity of .
However, the method proposed in Patent Document 1 is a method for improving the flash point of ester oil, and methods for improving the flash point of the above-mentioned paraffin-rich lubricating base oils have not been sufficiently studied. The current situation is that this has not been done.
そこで、本発明は、粘度指数が１２０以上であり、環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上であり、１５℃における密度が０．８３５ｇ／ｃｍ３以下であり、かつ特定の動粘度を有する、パラフィンリッチな潤滑油基油を用いた高引火点の潤滑油組成物、当該潤滑油基油用の引火点向上剤及び当該潤滑油基油の引火点向上方法を提供することを課題とする。
Therefore, the present invention has a viscosity index of 120 or more, a % CP of 85 or more by ring analysis (ndM method), a density at 15°C of 0.835 g/cm 3 or less, and Provides a high flash point lubricating oil composition using a paraffin-rich lubricating base oil having a specific kinematic viscosity, a flash point improver for the lubricating base oil, and a method for improving the flash point of the lubricating base oil. The task is to do so.
本発明によれば、下記［１］～［３］が提供される。
［１］ 潤滑油基油（Ｘ）と、ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを含有し、
前記潤滑油基油（Ｘ）が、下記要件（１）～（４）を満たし、
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。
前記ナフチルアミン系酸化防止剤（Ｂ）と前記ジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上であり、
前記リン含有フェノール系酸化防止剤（Ｃ）と前記ナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下である、潤滑油組成物。
［２］ ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを含有し、
前記ナフチルアミン系酸化防止剤（Ｂ）と前記ジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上であり、
前記リン含有フェノール系酸化防止剤（Ｃ）と前記ナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下である、潤滑油基油用の引火点向上剤。
［３］ 下記要件（１）～（４）を満たす潤滑油基油（Ｘ）に対し、上記［２］に記載の引火点向上剤を配合して、前記潤滑油基油（Ｘ）の引火点を向上させる、潤滑油基油の引火点向上方法。
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。 According to the present invention, the following [1] to [3] are provided.
[1] Contains a lubricating base oil (X), a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C),
The lubricating base oil (X) satisfies the following requirements (1) to (4),
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio,
A lubricating oil composition in which the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0.15 or less in mass ratio. thing.
[2] Contains a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C),
The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio,
A lubricating oil base in which the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0.15 or less in mass ratio. Flash point improver for oil.
[3] A lubricant base oil (X) that satisfies the following requirements (1) to (4) is blended with the flash point improver described in [2] above to reduce the ignition of the lubricant base oil (X). A method to improve the flash point of lubricant base oil.
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
［１］ 潤滑油基油（Ｘ）と、ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを含有し、
前記潤滑油基油（Ｘ）が、下記要件（１）～（４）を満たし、
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。
前記ナフチルアミン系酸化防止剤（Ｂ）と前記ジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上であり、
前記リン含有フェノール系酸化防止剤（Ｃ）と前記ナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下である、潤滑油組成物。
［２］ ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを含有し、
前記ナフチルアミン系酸化防止剤（Ｂ）と前記ジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上であり、
前記リン含有フェノール系酸化防止剤（Ｃ）と前記ナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下である、潤滑油基油用の引火点向上剤。
［３］ 下記要件（１）～（４）を満たす潤滑油基油（Ｘ）に対し、上記［２］に記載の引火点向上剤を配合して、前記潤滑油基油（Ｘ）の引火点を向上させる、潤滑油基油の引火点向上方法。
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。 According to the present invention, the following [1] to [3] are provided.
[1] Contains a lubricating base oil (X), a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C),
The lubricating base oil (X) satisfies the following requirements (1) to (4),
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio,
A lubricating oil composition in which the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0.15 or less in mass ratio. thing.
[2] Contains a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C),
The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio,
A lubricating oil base in which the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0.15 or less in mass ratio. Flash point improver for oil.
[3] A lubricant base oil (X) that satisfies the following requirements (1) to (4) is blended with the flash point improver described in [2] above to reduce the ignition of the lubricant base oil (X). A method to improve the flash point of lubricant base oil.
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
本発明によれば、粘度指数が１２０以上であり、環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上であり、１５℃における密度が０．８３５ｇ／ｃｍ３以下であり、かつ特定の動粘度を有する、パラフィンリッチな潤滑油基油を用いた高引火点の潤滑油組成物、当該潤滑油基油用の引火点向上剤及び当該潤滑油基油の引火点向上方法を提供することが可能となる。
According to the present invention, the viscosity index is 120 or more, the % CP by ring analysis (ndM method) is 85 or more, the density at 15°C is 0.835 g/cm 3 or less, and Provides a high flash point lubricating oil composition using a paraffin-rich lubricating base oil having a specific kinematic viscosity, a flash point improver for the lubricating base oil, and a method for improving the flash point of the lubricating base oil. It becomes possible to do so.
本明細書に記載された数値範囲の上限値および下限値は任意に組み合わせることができる。例えば、数値範囲として「Ａ～Ｂ」及び「Ｃ～Ｄ」が記載されている場合、「Ａ～Ｄ」及び「Ｃ～Ｂ」の数値範囲も、本発明の範囲に含まれる。
また、本明細書に記載された数値範囲「下限値～上限値」は、特に断りのない限り、下限値以上、上限値以下であることを意味する。
また、本明細書において、実施例の数値は、上限値又は下限値として用いられ得る数値である。 The upper and lower limits of the numerical ranges described herein can be arbitrarily combined. For example, when "A to B" and "C to D" are described as numerical ranges, the numerical ranges of "A to D" and "C to B" are also included in the scope of the present invention.
Furthermore, the numerical range "lower limit to upper limit" described in this specification means that it is greater than or equal to the lower limit and less than or equal to the upper limit, unless otherwise specified.
Further, in this specification, numerical values in Examples are numerical values that can be used as upper limit values or lower limit values.
また、本明細書に記載された数値範囲「下限値～上限値」は、特に断りのない限り、下限値以上、上限値以下であることを意味する。
また、本明細書において、実施例の数値は、上限値又は下限値として用いられ得る数値である。 The upper and lower limits of the numerical ranges described herein can be arbitrarily combined. For example, when "A to B" and "C to D" are described as numerical ranges, the numerical ranges of "A to D" and "C to B" are also included in the scope of the present invention.
Furthermore, the numerical range "lower limit to upper limit" described in this specification means that it is greater than or equal to the lower limit and less than or equal to the upper limit, unless otherwise specified.
Further, in this specification, numerical values in Examples are numerical values that can be used as upper limit values or lower limit values.
［潤滑油組成物の態様］
本実施形態の潤滑油組成物は、潤滑油基油（Ｘ）と、ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを含有する。
潤滑油基油（Ｘ）は、下記要件（１）～（４）を満たす。
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。
ナフチルアミン系酸化防止剤（Ｂ）とジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］は、質量比で、２．０以上である。
そして、リン含有フェノール系酸化防止剤（Ｃ）とナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］は、質量比で、０．１５以下である。 [Aspects of lubricating oil composition]
The lubricating oil composition of this embodiment includes a lubricating base oil (X), a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C). Contains.
The lubricating base oil (X) satisfies the following requirements (1) to (4).
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio.
The content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0.15 or less in mass ratio.
本実施形態の潤滑油組成物は、潤滑油基油（Ｘ）と、ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを含有する。
潤滑油基油（Ｘ）は、下記要件（１）～（４）を満たす。
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。
ナフチルアミン系酸化防止剤（Ｂ）とジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］は、質量比で、２．０以上である。
そして、リン含有フェノール系酸化防止剤（Ｃ）とナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］は、質量比で、０．１５以下である。 [Aspects of lubricating oil composition]
The lubricating oil composition of this embodiment includes a lubricating base oil (X), a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C). Contains.
The lubricating base oil (X) satisfies the following requirements (1) to (4).
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio.
The content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0.15 or less in mass ratio.
本発明者は、上記課題を解決すべく、鋭意検討を行った。その結果、潤滑油基油（Ｘ）の引火点を向上させる上で、下記（Ｉ）～（ＩＩＩ）が重要であることを知見するに至った。
（Ｉ）ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを組み合わせて用いること。
（ＩＩ）ナフチルアミン系酸化防止剤（Ｂ）とジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上であること。
（ＩＩＩ）リン含有フェノール系酸化防止剤（Ｃ）とナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下であること。 The present inventor conducted extensive studies in order to solve the above problems. As a result, it has been found that the following (I) to (III) are important in improving the flash point of the lubricant base oil (X).
(I) Using a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C) in combination.
(II) The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio.
(III) The content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0.15 or less in mass ratio.
（Ｉ）ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを組み合わせて用いること。
（ＩＩ）ナフチルアミン系酸化防止剤（Ｂ）とジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上であること。
（ＩＩＩ）リン含有フェノール系酸化防止剤（Ｃ）とナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下であること。 The present inventor conducted extensive studies in order to solve the above problems. As a result, it has been found that the following (I) to (III) are important in improving the flash point of the lubricant base oil (X).
(I) Using a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C) in combination.
(II) The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio.
(III) The content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0.15 or less in mass ratio.
潤滑油基油（Ｘ）の引火点が向上するメカニズムは、明確にはなっていないが、例えば、上記（Ｉ）～（ＩＩＩ）を満たすことで、ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）との間に何らかの相互作用が生じ、潤滑油基油（Ｘ）の引火点に何らかの影響を及ぼしていることによるものと推察される。
The mechanism by which the flash point of the lubricant base oil (X) is improved is not clear, but for example, by satisfying (I) to (III) above, diphenylamine antioxidant (A) and naphthylamine This is due to some kind of interaction between the antioxidant (B) and the phosphorus-containing phenolic antioxidant (C), which has some effect on the flash point of the lubricant base oil (X). It is inferred.
なお、以降の説明では、「潤滑油基油（Ｘ）」、「ジフェニルアミン系酸化防止剤（Ａ）」、「ナフチルアミン系酸化防止剤（Ｂ）」、「リン含有フェノール系酸化防止剤（Ｃ）」を、それぞれ「成分（Ｘ）」、「成分（Ａ）」、「成分（Ｂ）」、及び「成分（Ｃ）」ともいう。
In the following explanation, "lubricating base oil (X)," "diphenylamine antioxidant (A)," "naphthylamine antioxidant (B)," and "phosphorus-containing phenolic antioxidant (C)" will be used. ” are also referred to as “component (X),” “component (A),” “component (B),” and “component (C),” respectively.
本実施形態の潤滑油組成物は、「成分（Ｘ）」、「成分（Ａ）」、「成分（Ｂ）」、及び「成分（Ｃ）」のみから構成されていてもよいが、本発明の趣旨を逸脱することのない範囲で、「成分（Ｘ）」、「成分（Ａ）」、「成分（Ｂ）」、及び「成分（Ｃ）」以外の他の成分を含有していてもよい。
本実施形態の潤滑油組成物において、「成分（Ｘ）」、「成分（Ａ）」、「成分（Ｂ）」、及び「成分（Ｃ）」の合計含有量は、潤滑油組成物の全量基準で、好ましくは８０質量％以上、より好ましくは８５質量％以上、更に好ましくは９０質量％以上である。 The lubricating oil composition of this embodiment may be composed only of "component (X),""component(A),""component(B)," and "component (C)," but the present invention Even if it contains other ingredients than "ingredient (X),""ingredient(A),""ingredient(B)," and "ingredient (C)" as long as it does not deviate from the spirit of good.
In the lubricating oil composition of this embodiment, the total content of "component (X)", "component (A)", "component (B)", and "component (C)" is the total amount of the lubricating oil composition. Based on the standard, it is preferably 80% by mass or more, more preferably 85% by mass or more, and still more preferably 90% by mass or more.
本実施形態の潤滑油組成物において、「成分（Ｘ）」、「成分（Ａ）」、「成分（Ｂ）」、及び「成分（Ｃ）」の合計含有量は、潤滑油組成物の全量基準で、好ましくは８０質量％以上、より好ましくは８５質量％以上、更に好ましくは９０質量％以上である。 The lubricating oil composition of this embodiment may be composed only of "component (X),""component(A),""component(B)," and "component (C)," but the present invention Even if it contains other ingredients than "ingredient (X),""ingredient(A),""ingredient(B)," and "ingredient (C)" as long as it does not deviate from the spirit of good.
In the lubricating oil composition of this embodiment, the total content of "component (X)", "component (A)", "component (B)", and "component (C)" is the total amount of the lubricating oil composition. Based on the standard, it is preferably 80% by mass or more, more preferably 85% by mass or more, and still more preferably 90% by mass or more.
以下、本実施形態の潤滑油組成物を構成する各成分について、詳細に説明する。
Hereinafter, each component constituting the lubricating oil composition of this embodiment will be explained in detail.
＜潤滑油基油（Ｘ）＞
潤滑油基油（Ｘ）は、下記要件（１）～（４）を満たす。
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。 <Lubricant base oil (X)>
The lubricating base oil (X) satisfies the following requirements (1) to (4).
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
潤滑油基油（Ｘ）は、下記要件（１）～（４）を満たす。
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。 <Lubricant base oil (X)>
The lubricating base oil (X) satisfies the following requirements (1) to (4).
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
本明細書において、要件（４）に規定される４０℃における動粘度（以下、「４０℃動粘度」ともいう）及び要件（１）に規定される粘度指数は、ＪＩＳ Ｋ２２８３：２０００に準拠して測定及び算出される値を意味する。
また、本明細書において、要件（２）に規定される％ＣＰは、ＡＳＴＭ Ｄ３２３８：１９９５に準拠し、環分析（ｎ－ｄ－Ｍ法）により算出される値を意味する。
また、本明細書において、要件（３）に規定される１５℃における密度は、ＪＩＳ Ｋ ２２４９－１：２０１１（原油及び石油製品－密度の求め方－ 第１部：振動法）に準拠して測定される値を意味する。 In this specification, the kinematic viscosity at 40°C specified in requirement (4) (hereinafter also referred to as "40°C kinematic viscosity") and the viscosity index specified in requirement (1) are based on JIS K2283:2000. means the value measured and calculated.
Further, in this specification, %C P defined in requirement (2) means a value calculated by ring analysis (ndM method) in accordance with ASTM D3238:1995.
In addition, in this specification, the density at 15°C specified in requirement (3) is determined in accordance with JIS K 2249-1:2011 (Crude oil and petroleum products - How to determine density - Part 1: Vibration method). means the value to be measured.
また、本明細書において、要件（２）に規定される％ＣＰは、ＡＳＴＭ Ｄ３２３８：１９９５に準拠し、環分析（ｎ－ｄ－Ｍ法）により算出される値を意味する。
また、本明細書において、要件（３）に規定される１５℃における密度は、ＪＩＳ Ｋ ２２４９－１：２０１１（原油及び石油製品－密度の求め方－ 第１部：振動法）に準拠して測定される値を意味する。 In this specification, the kinematic viscosity at 40°C specified in requirement (4) (hereinafter also referred to as "40°C kinematic viscosity") and the viscosity index specified in requirement (1) are based on JIS K2283:2000. means the value measured and calculated.
Further, in this specification, %C P defined in requirement (2) means a value calculated by ring analysis (ndM method) in accordance with ASTM D3238:1995.
In addition, in this specification, the density at 15°C specified in requirement (3) is determined in accordance with JIS K 2249-1:2011 (Crude oil and petroleum products - How to determine density - Part 1: Vibration method). means the value to be measured.
潤滑油基油（Ｘ）は、例えば、パラフィン系原油を常圧蒸留して得られる常圧残油を、さらに減圧蒸留して得られる留出油に対し、水素化分解を行ってボトム油を得て、当該ボトム油に、水素化異性化脱蝋及び水素化精製の少なくとも一つ以上の処理を施した基油等が挙げられる。また、高ワックス留出油、スラックワックス、及びＧＴＬワックスから選択される１種以上の原料油に対し、水素化異性化脱蝋及び水素化精製の少なくとも一つ以上の処理を施した基油等も挙げられる。
これらの基油は、１種を単独でもよく、２種以上を組み合わせた混合基油でもよい。なお、混合基油を用いる場合、当該混合基油が要件（１）～（４）を満たしていればよい。 The lubricating oil base oil (X) is obtained by, for example, distilling a paraffinic crude oil under atmospheric pressure to obtain an atmospheric residual oil, and further distilling the distillate under reduced pressure, and then hydrocracking the distillate to obtain a bottom oil. Examples include base oils obtained by subjecting the bottom oil to at least one of hydroisomerization dewaxing and hydrorefining. Furthermore, base oils etc. are obtained by subjecting at least one of hydroisomerization dewaxing and hydrorefining to one or more feedstock oils selected from high-wax distillate oils, slack waxes, and GTL waxes. can also be mentioned.
These base oils may be used alone or in combination of two or more. In addition, when using a mixed base oil, it is sufficient that the mixed base oil satisfies requirements (1) to (4).
これらの基油は、１種を単独でもよく、２種以上を組み合わせた混合基油でもよい。なお、混合基油を用いる場合、当該混合基油が要件（１）～（４）を満たしていればよい。 The lubricating oil base oil (X) is obtained by, for example, distilling a paraffinic crude oil under atmospheric pressure to obtain an atmospheric residual oil, and further distilling the distillate under reduced pressure, and then hydrocracking the distillate to obtain a bottom oil. Examples include base oils obtained by subjecting the bottom oil to at least one of hydroisomerization dewaxing and hydrorefining. Furthermore, base oils etc. are obtained by subjecting at least one of hydroisomerization dewaxing and hydrorefining to one or more feedstock oils selected from high-wax distillate oils, slack waxes, and GTL waxes. can also be mentioned.
These base oils may be used alone or in combination of two or more. In addition, when using a mixed base oil, it is sufficient that the mixed base oil satisfies requirements (1) to (4).
ここで、本発明の効果をより向上させやすくする観点から、要件（３）に規定される１５℃における密度は、好ましくは０．８３５ｇ／ｃｍ３以下、より好ましくは０．８３２ｇ／ｃｍ３以下、更に好ましくは０．８３０ｇ／ｃｍ３以下、より更に好ましくは０．８２８ｇ／ｃｍ３以下である。また、好ましくは０．８１５ｇ／ｃｍ３以上である。
Here, from the viewpoint of making it easier to improve the effects of the present invention, the density at 15°C specified in requirement (3) is preferably 0.835 g/cm 3 or less, more preferably 0.832 g/cm 3 or less. , more preferably 0.830 g/cm 3 or less, even more preferably 0.828 g/cm 3 or less. Moreover, preferably it is 0.815 g/cm 3 or more.
また、本発明の効果をより向上させやすくする観点、及び潤滑油基油（Ｘ）自体の引火点を向上させやすくする観点から、要件（４）に規定される４０℃における動粘度（以下、「４０℃動粘度」ともいう）は、好ましくは３０．０ｍｍ２／ｓ以上、より好ましくは３５．０ｍｍ２／ｓ以上、更に好ましくは４１．４ｍｍ２／ｓ以上である。また、本発明の効果をより向上させやすくする観点から、好ましくは５０．６ｍｍ２／ｓ以下、より好ましくは４８．０ｍｍ２／ｓ以下、更に好ましくは４６．０ｍｍ２／ｓ以下である。
In addition, from the viewpoint of making it easier to improve the effects of the present invention and the flash point of the lubricating base oil (X) itself, the kinematic viscosity at 40°C specified in requirement (4) (hereinafter referred to as (also referred to as "40°C kinematic viscosity") is preferably 30.0 mm 2 /s or more, more preferably 35.0 mm 2 /s or more, still more preferably 41.4 mm 2 /s or more. Further, from the viewpoint of easily improving the effects of the present invention, the speed is preferably 50.6 mm 2 /s or less, more preferably 48.0 mm 2 /s or less, and still more preferably 46.0 mm 2 /s or less.
なお、要件（１）に規定される粘度指数の上限値は、特に限定されないが、例えば１８０以下である。
また、要件（２）に規定される％ＣＰは、８５以上、好ましくは８７以上、より好ましくは９０以上であり、その上限値は、特に限定されないが、例えば１００以下である。 Note that the upper limit of the viscosity index specified in requirement (1) is not particularly limited, but is, for example, 180 or less.
Further, % CP defined in requirement (2) is 85 or more, preferably 87 or more, more preferably 90 or more, and the upper limit thereof is not particularly limited, but is, for example, 100 or less.
また、要件（２）に規定される％ＣＰは、８５以上、好ましくは８７以上、より好ましくは９０以上であり、その上限値は、特に限定されないが、例えば１００以下である。 Note that the upper limit of the viscosity index specified in requirement (1) is not particularly limited, but is, for example, 180 or less.
Further, % CP defined in requirement (2) is 85 or more, preferably 87 or more, more preferably 90 or more, and the upper limit thereof is not particularly limited, but is, for example, 100 or less.
潤滑油基油（Ｘ）の引火点は、通常２３０℃以上であるが、好ましくは２３５℃以上、より好ましくは２４０℃以上、更に好ましくは２４５℃以上である。
本明細書において、引火点は、ＪＩＳ Ｋ２２６５－４：２００７に準拠し、クリーブランド開放（ＣＯＣ）法により測定した値を意味する。 The flash point of the lubricating base oil (X) is usually 230°C or higher, preferably 235°C or higher, more preferably 240°C or higher, even more preferably 245°C or higher.
As used herein, the flash point refers to a value measured by the Open Cleveland (COC) method in accordance with JIS K2265-4:2007.
本明細書において、引火点は、ＪＩＳ Ｋ２２６５－４：２００７に準拠し、クリーブランド開放（ＣＯＣ）法により測定した値を意味する。 The flash point of the lubricating base oil (X) is usually 230°C or higher, preferably 235°C or higher, more preferably 240°C or higher, even more preferably 245°C or higher.
As used herein, the flash point refers to a value measured by the Open Cleveland (COC) method in accordance with JIS K2265-4:2007.
本実施形態の潤滑油組成物において、潤滑油基油（Ｘ）の含有量は、潤滑油組成物の全量基準で、好ましくは９０．０質量％以上、より好ましくは９３．０質量％以上、更に好ましくは９５．０質量％以上である。また、好ましくは９９．７質量％以下である。
In the lubricating oil composition of the present embodiment, the content of the lubricating oil base oil (X) is preferably 90.0% by mass or more, more preferably 93.0% by mass or more, based on the total amount of the lubricating oil composition. More preferably, it is 95.0% by mass or more. Moreover, it is preferably 99.7% by mass or less.
＜潤滑油基油（Ｘ’）＞
本実施形態の潤滑油組成物は、潤滑油基油（Ｘ）には該当しない、潤滑油基油（Ｘ’）をさらに含有していてもよい。
潤滑油基油（Ｘ’）としては、要件（１）～（４）のうちの少なくとも１つを満たさない鉱油及び要件（１）～（４）のうちの少なくとも１つを満たさない合成油からなる群から選択される１種以上が挙げられる。
但し、本発明の効果をより向上させやすくする観点から、潤滑油基油（Ｘ’）の含有量は少ないことが好ましい。
具体的には、潤滑油基油（Ｘ’）の含有量は、潤滑油基油（Ｘ）１００質量部に対し、好ましくは５０質量部未満、より好ましくは３０質量％未満、更に好ましくは１０質量部未満、より更に好ましくは１質量部未満、更になお好ましくは０．１質量部未満である。 <Lubricant base oil (X')>
The lubricant composition of this embodiment may further contain a lubricant base oil (X') that does not correspond to the lubricant base oil (X).
The lubricating oil base oil (X') is made from mineral oils that do not meet at least one of requirements (1) to (4) and synthetic oils that do not meet at least one of requirements (1) to (4). One or more types selected from the group consisting of:
However, from the viewpoint of making it easier to improve the effects of the present invention, it is preferable that the content of the lubricating base oil (X') is small.
Specifically, the content of the lubricating base oil (X') is preferably less than 50 parts by mass, more preferably less than 30% by mass, even more preferably 10 parts by mass, based on 100 parts by mass of the lubricating base oil (X). Less than 1 part by weight, even more preferably less than 1 part by weight, even more preferably less than 0.1 part by weight.
本実施形態の潤滑油組成物は、潤滑油基油（Ｘ）には該当しない、潤滑油基油（Ｘ’）をさらに含有していてもよい。
潤滑油基油（Ｘ’）としては、要件（１）～（４）のうちの少なくとも１つを満たさない鉱油及び要件（１）～（４）のうちの少なくとも１つを満たさない合成油からなる群から選択される１種以上が挙げられる。
但し、本発明の効果をより向上させやすくする観点から、潤滑油基油（Ｘ’）の含有量は少ないことが好ましい。
具体的には、潤滑油基油（Ｘ’）の含有量は、潤滑油基油（Ｘ）１００質量部に対し、好ましくは５０質量部未満、より好ましくは３０質量％未満、更に好ましくは１０質量部未満、より更に好ましくは１質量部未満、更になお好ましくは０．１質量部未満である。 <Lubricant base oil (X')>
The lubricant composition of this embodiment may further contain a lubricant base oil (X') that does not correspond to the lubricant base oil (X).
The lubricating oil base oil (X') is made from mineral oils that do not meet at least one of requirements (1) to (4) and synthetic oils that do not meet at least one of requirements (1) to (4). One or more types selected from the group consisting of:
However, from the viewpoint of making it easier to improve the effects of the present invention, it is preferable that the content of the lubricating base oil (X') is small.
Specifically, the content of the lubricating base oil (X') is preferably less than 50 parts by mass, more preferably less than 30% by mass, even more preferably 10 parts by mass, based on 100 parts by mass of the lubricating base oil (X). Less than 1 part by weight, even more preferably less than 1 part by weight, even more preferably less than 0.1 part by weight.
＜ジフェニルアミン系酸化防止剤（Ａ）＞
本実施形態の潤滑油組成物は、ジフェニルアミン系酸化防止剤（Ａ）を含有する。
ジフェニルアミン系酸化防止剤（Ａ）を含有しない場合、本発明の効果が発揮されなくなる。 <Diphenylamine antioxidant (A)>
The lubricating oil composition of this embodiment contains a diphenylamine antioxidant (A).
If the diphenylamine antioxidant (A) is not contained, the effects of the present invention will not be exhibited.
本実施形態の潤滑油組成物は、ジフェニルアミン系酸化防止剤（Ａ）を含有する。
ジフェニルアミン系酸化防止剤（Ａ）を含有しない場合、本発明の効果が発揮されなくなる。 <Diphenylamine antioxidant (A)>
The lubricating oil composition of this embodiment contains a diphenylamine antioxidant (A).
If the diphenylamine antioxidant (A) is not contained, the effects of the present invention will not be exhibited.
ジフェニルアミン系酸化防止剤（Ａ）としては、潤滑油組成物用の酸化防止剤として一般的に用いられるジフェニルアミン系酸化防止剤を用いることができる。
ジフェニルアミン系酸化防止剤（Ａ）は、１種を単独で用いてもよく、２種以上を組み合わせて用いてもよい。 As the diphenylamine antioxidant (A), a diphenylamine antioxidant commonly used as an antioxidant for lubricating oil compositions can be used.
The diphenylamine antioxidant (A) may be used alone or in combination of two or more.
ジフェニルアミン系酸化防止剤（Ａ）は、１種を単独で用いてもよく、２種以上を組み合わせて用いてもよい。 As the diphenylamine antioxidant (A), a diphenylamine antioxidant commonly used as an antioxidant for lubricating oil compositions can be used.
The diphenylamine antioxidant (A) may be used alone or in combination of two or more.
ここで、本実施形態の潤滑油組成物において、ジフェニルアミン系酸化防止剤（Ａ）は、本発明の効果をより向上させやすくする観点から、下記一般式（ａ１）で表される化合物（Ａ１）を含むことが好ましい。
ジフェニルアミン系酸化防止剤（Ａ）中の化合物（Ａ１）の含有量は、同様の観点から、ジフェニルアミン系酸化防止剤（Ａ）の全量基準で、好ましくは５０質量％～１００質量％、より好ましくは６０質量％～１００質量％、更に好ましくは７０質量％～１００質量％、より更に好ましくは８０質量％～１００質量％、更になお好ましくは９０質量％～１００質量％、一層好ましくは９５質量％～１００質量％である。 Here, in the lubricating oil composition of the present embodiment, the diphenylamine antioxidant (A) is a compound (A1) represented by the following general formula (a1) from the viewpoint of easily improving the effects of the present invention. It is preferable to include.
From the same viewpoint, the content of the compound (A1) in the diphenylamine antioxidant (A) is preferably 50% by mass to 100% by mass, more preferably 50% by mass based on the total amount of the diphenylamine antioxidant (A). 60% by mass to 100% by mass, more preferably 70% to 100% by mass, even more preferably 80% to 100% by mass, even more preferably 90% to 100% by mass, even more preferably 95% by mass to It is 100% by mass.
ジフェニルアミン系酸化防止剤（Ａ）中の化合物（Ａ１）の含有量は、同様の観点から、ジフェニルアミン系酸化防止剤（Ａ）の全量基準で、好ましくは５０質量％～１００質量％、より好ましくは６０質量％～１００質量％、更に好ましくは７０質量％～１００質量％、より更に好ましくは８０質量％～１００質量％、更になお好ましくは９０質量％～１００質量％、一層好ましくは９５質量％～１００質量％である。 Here, in the lubricating oil composition of the present embodiment, the diphenylamine antioxidant (A) is a compound (A1) represented by the following general formula (a1) from the viewpoint of easily improving the effects of the present invention. It is preferable to include.
From the same viewpoint, the content of the compound (A1) in the diphenylamine antioxidant (A) is preferably 50% by mass to 100% by mass, more preferably 50% by mass based on the total amount of the diphenylamine antioxidant (A). 60% by mass to 100% by mass, more preferably 70% to 100% by mass, even more preferably 80% to 100% by mass, even more preferably 90% to 100% by mass, even more preferably 95% by mass to It is 100% by mass.
上記一般式（ａ１）中、Ｒａ１及びＲａ２は、各々独立に、炭素数１～３０のアルキル基である。
当該アルキル基の炭素数が１～３０であると、本発明の効果が向上しやすくなる。
Ｒａ１及びＲａ２として選択し得るアルキル基の炭素数は、本発明の効果をより向上させやすくする観点から、各々独立に、好ましくは１～２０、より好ましくは４～１６、更に好ましくは４～１４である。
Ｒａ１及びＲａ２として選択し得るアルキル基の具体例としては、メチル基、エチル基、プロピル基、ブチル基、ペンチル基、ヘキシル基、ヘプチル基、オクチル基、ノニル基、デシル基、ウンデシル基、ドデシル基、トリデシル基、テトラデシル基、ペンタデシル基、ヘキサデシル基、ヘプタデシル基、オクタデシル基、ノナデシル基、イコシル基、ヘンイコシル基、ドコシル基、トリコシル基、テトラコシル基、ペンタコシル基、ヘキサコシル基、ヘプタコシル基、オクタコシル基、ノナコシル基、トリアコンチル基等が挙げられる。これらは、直鎖状であっても分岐鎖状であってもよい。 In the above general formula (a1), R a1 and R a2 are each independently an alkyl group having 1 to 30 carbon atoms.
When the alkyl group has 1 to 30 carbon atoms, the effects of the present invention are likely to be improved.
The number of carbon atoms in the alkyl group that can be selected as R a1 and R a2 is preferably 1 to 20, more preferably 4 to 16, still more preferably 4, from the viewpoint of improving the effects of the present invention. ~14.
Specific examples of alkyl groups that can be selected as R a1 and R a2 include methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, Dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group, henicosyl group, docosyl group, tricosyl group, tetracosyl group, pentacosyl group, hexacosyl group, heptacyl group, octacosyl group , nonacosyl group, triacontyl group, etc. These may be linear or branched.
当該アルキル基の炭素数が１～３０であると、本発明の効果が向上しやすくなる。
Ｒａ１及びＲａ２として選択し得るアルキル基の炭素数は、本発明の効果をより向上させやすくする観点から、各々独立に、好ましくは１～２０、より好ましくは４～１６、更に好ましくは４～１４である。
Ｒａ１及びＲａ２として選択し得るアルキル基の具体例としては、メチル基、エチル基、プロピル基、ブチル基、ペンチル基、ヘキシル基、ヘプチル基、オクチル基、ノニル基、デシル基、ウンデシル基、ドデシル基、トリデシル基、テトラデシル基、ペンタデシル基、ヘキサデシル基、ヘプタデシル基、オクタデシル基、ノナデシル基、イコシル基、ヘンイコシル基、ドコシル基、トリコシル基、テトラコシル基、ペンタコシル基、ヘキサコシル基、ヘプタコシル基、オクタコシル基、ノナコシル基、トリアコンチル基等が挙げられる。これらは、直鎖状であっても分岐鎖状であってもよい。 In the above general formula (a1), R a1 and R a2 are each independently an alkyl group having 1 to 30 carbon atoms.
When the alkyl group has 1 to 30 carbon atoms, the effects of the present invention are likely to be improved.
The number of carbon atoms in the alkyl group that can be selected as R a1 and R a2 is preferably 1 to 20, more preferably 4 to 16, still more preferably 4, from the viewpoint of improving the effects of the present invention. ~14.
Specific examples of alkyl groups that can be selected as R a1 and R a2 include methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, Dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group, henicosyl group, docosyl group, tricosyl group, tetracosyl group, pentacosyl group, hexacosyl group, heptacyl group, octacosyl group , nonacosyl group, triacontyl group, etc. These may be linear or branched.
上記一般式（ａ１）中、ｎａ１及びｎａ２は、各々独立に、１～５の整数である。
ｎａ１及びｎａ２は、本発明の効果をより向上させやすくする観点から、各々独立に、好ましくは１～３、より好ましくは１～２、更に好ましくは１である。 In the above general formula (a1), na1 and na2 are each independently an integer of 1 to 5.
na1 and na2 are each independently preferably from 1 to 3, more preferably from 1 to 2, still more preferably from 1, from the viewpoint of making it easier to improve the effects of the present invention.
ｎａ１及びｎａ２は、本発明の効果をより向上させやすくする観点から、各々独立に、好ましくは１～３、より好ましくは１～２、更に好ましくは１である。 In the above general formula (a1), na1 and na2 are each independently an integer of 1 to 5.
na1 and na2 are each independently preferably from 1 to 3, more preferably from 1 to 2, still more preferably from 1, from the viewpoint of making it easier to improve the effects of the present invention.
化合物（Ａ１）は、１種を単独で用いてもよく、２種以上を組み合わせて用いてもよい。
One type of compound (A1) may be used alone, or two or more types may be used in combination.
＜ナフチルアミン系酸化防止剤（Ｂ）＞
本実施形態の潤滑油組成物は、ナフチルアミン系酸化防止剤（Ｂ）を含有する。
ナフチルアミン系酸化防止剤（Ｂ）を含有しない場合、本発明の効果が発揮されなくなる。 <Naphthylamine antioxidant (B)>
The lubricating oil composition of this embodiment contains a naphthylamine antioxidant (B).
If the naphthylamine antioxidant (B) is not contained, the effects of the present invention will not be exhibited.
本実施形態の潤滑油組成物は、ナフチルアミン系酸化防止剤（Ｂ）を含有する。
ナフチルアミン系酸化防止剤（Ｂ）を含有しない場合、本発明の効果が発揮されなくなる。 <Naphthylamine antioxidant (B)>
The lubricating oil composition of this embodiment contains a naphthylamine antioxidant (B).
If the naphthylamine antioxidant (B) is not contained, the effects of the present invention will not be exhibited.
ナフチルアミン系酸化防止剤（Ｂ）としては、潤滑油組成物用の酸化防止剤として一般的に用いられるナフチルアミン系酸化防止剤を用いることができる。
ナフチルアミン系酸化防止剤（Ｂ）は、１種を単独で用いてもよく、２種以上を組み合わせて用いてもよい。 As the naphthylamine antioxidant (B), a naphthylamine antioxidant commonly used as an antioxidant for lubricating oil compositions can be used.
The naphthylamine antioxidant (B) may be used alone or in combination of two or more.
ナフチルアミン系酸化防止剤（Ｂ）は、１種を単独で用いてもよく、２種以上を組み合わせて用いてもよい。 As the naphthylamine antioxidant (B), a naphthylamine antioxidant commonly used as an antioxidant for lubricating oil compositions can be used.
The naphthylamine antioxidant (B) may be used alone or in combination of two or more.
ここで、本実施形態の潤滑油組成物において、ナフチルアミン系酸化防止剤（Ｂ）は、本発明の効果をより向上させやすくする観点から、下記一般式（ｂ１）で表される化合物（Ｂ１）を含むことが好ましい。
ナフチルアミン系酸化防止剤（Ｂ）中の化合物（Ｂ１）の含有量は、同様の観点から、ナフチルアミン系酸化防止剤（Ｂ）の全量基準で、好ましくは５０質量％～１００質量％、より好ましくは６０質量％～１００質量％、更に好ましくは７０質量％～１００質量％、より更に好ましくは８０質量％～１００質量％、更になお好ましくは９０質量％～１００質量％、一層好ましくは９５質量％～１００質量％である。 Here, in the lubricating oil composition of the present embodiment, the naphthylamine antioxidant (B) is a compound (B1) represented by the following general formula (b1) from the viewpoint of easily improving the effects of the present invention. It is preferable to include.
From the same point of view, the content of compound (B1) in the naphthylamine antioxidant (B) is preferably 50% by mass to 100% by mass, more preferably 60% by mass to 100% by mass, more preferably 70% to 100% by mass, even more preferably 80% to 100% by mass, even more preferably 90% to 100% by mass, even more preferably 95% by mass to It is 100% by mass.
ナフチルアミン系酸化防止剤（Ｂ）中の化合物（Ｂ１）の含有量は、同様の観点から、ナフチルアミン系酸化防止剤（Ｂ）の全量基準で、好ましくは５０質量％～１００質量％、より好ましくは６０質量％～１００質量％、更に好ましくは７０質量％～１００質量％、より更に好ましくは８０質量％～１００質量％、更になお好ましくは９０質量％～１００質量％、一層好ましくは９５質量％～１００質量％である。 Here, in the lubricating oil composition of the present embodiment, the naphthylamine antioxidant (B) is a compound (B1) represented by the following general formula (b1) from the viewpoint of easily improving the effects of the present invention. It is preferable to include.
From the same point of view, the content of compound (B1) in the naphthylamine antioxidant (B) is preferably 50% by mass to 100% by mass, more preferably 60% by mass to 100% by mass, more preferably 70% to 100% by mass, even more preferably 80% to 100% by mass, even more preferably 90% to 100% by mass, even more preferably 95% by mass to It is 100% by mass.
上記一般式（ｂ１）中、Ｒｂ１は、炭素数１～３０のアルキル基である。
当該アルキル基の炭素数が１～３０であると、本発明の効果が向上しやすくなる。
Ｒｂ１として選択し得るアルキル基の炭素数は、本発明の効果をより向上させやすくする観点から、各々独立に、好ましくは１～２０、より好ましくは４～１６、更に好ましくは４～１４である。
Ｒｂ１として選択し得るアルキル基の具体例としては、Ｒａ１及びＲａ２として選択し得るアルキル基として例示したものが挙げられる。当該アルキル基は、直鎖状であってもよく、分岐鎖状であってもよい。 In the above general formula (b1), R b1 is an alkyl group having 1 to 30 carbon atoms.
When the alkyl group has 1 to 30 carbon atoms, the effects of the present invention are likely to be improved.
The number of carbon atoms in the alkyl group that can be selected as R b1 is preferably 1 to 20, more preferably 4 to 16, still more preferably 4 to 14, from the viewpoint of improving the effects of the present invention. be.
Specific examples of the alkyl group that can be selected as R b1 include those exemplified as the alkyl groups that can be selected as R a1 and R a2 . The alkyl group may be linear or branched.
当該アルキル基の炭素数が１～３０であると、本発明の効果が向上しやすくなる。
Ｒｂ１として選択し得るアルキル基の炭素数は、本発明の効果をより向上させやすくする観点から、各々独立に、好ましくは１～２０、より好ましくは４～１６、更に好ましくは４～１４である。
Ｒｂ１として選択し得るアルキル基の具体例としては、Ｒａ１及びＲａ２として選択し得るアルキル基として例示したものが挙げられる。当該アルキル基は、直鎖状であってもよく、分岐鎖状であってもよい。 In the above general formula (b1), R b1 is an alkyl group having 1 to 30 carbon atoms.
When the alkyl group has 1 to 30 carbon atoms, the effects of the present invention are likely to be improved.
The number of carbon atoms in the alkyl group that can be selected as R b1 is preferably 1 to 20, more preferably 4 to 16, still more preferably 4 to 14, from the viewpoint of improving the effects of the present invention. be.
Specific examples of the alkyl group that can be selected as R b1 include those exemplified as the alkyl groups that can be selected as R a1 and R a2 . The alkyl group may be linear or branched.
上記一般式（ｂ１）中、ｎｂ１は、１～５の整数である。
ｎｂ１は、本発明の効果をより向上させやすくする観点から、好ましくは１～３、より好ましくは１～２、更に好ましくは１である。 In the above general formula (b1), nb1 is an integer of 1 to 5.
nb1 is preferably 1 to 3, more preferably 1 to 2, and still more preferably 1 from the viewpoint of making it easier to improve the effects of the present invention.
ｎｂ１は、本発明の効果をより向上させやすくする観点から、好ましくは１～３、より好ましくは１～２、更に好ましくは１である。 In the above general formula (b1), nb1 is an integer of 1 to 5.
nb1 is preferably 1 to 3, more preferably 1 to 2, and still more preferably 1 from the viewpoint of making it easier to improve the effects of the present invention.
化合物（Ｂ１）は、１種を単独で用いてもよく、２種以上を組み合わせて用いてもよい。
One type of compound (B1) may be used alone, or two or more types may be used in combination.
＜リン含有フェノール系酸化防止剤（Ｃ）＞
本実施形態の潤滑油組成物は、リン含有フェノール系酸化防止剤（Ｃ）を含有する。
リン含有フェノール系酸化防止剤（Ｃ）を含有しない場合、本発明の効果が発揮されなくなる。 <Phosphorus-containing phenolic antioxidant (C)>
The lubricating oil composition of this embodiment contains a phosphorus-containing phenolic antioxidant (C).
If the phosphorus-containing phenolic antioxidant (C) is not contained, the effects of the present invention will not be exhibited.
本実施形態の潤滑油組成物は、リン含有フェノール系酸化防止剤（Ｃ）を含有する。
リン含有フェノール系酸化防止剤（Ｃ）を含有しない場合、本発明の効果が発揮されなくなる。 <Phosphorus-containing phenolic antioxidant (C)>
The lubricating oil composition of this embodiment contains a phosphorus-containing phenolic antioxidant (C).
If the phosphorus-containing phenolic antioxidant (C) is not contained, the effects of the present invention will not be exhibited.
リン含有フェノール系酸化防止剤（Ｃ）としては、潤滑油組成物用の酸化防止剤として一般的に用いられるリン含有フェノール系酸化防止剤を用いることができる。
リン含有フェノール系酸化防止剤（Ｃ）は、１種を単独で用いてもよく、２種以上を組み合わせて用いてもよい。 As the phosphorus-containing phenolic antioxidant (C), a phosphorus-containing phenolic antioxidant that is commonly used as an antioxidant for lubricating oil compositions can be used.
The phosphorus-containing phenolic antioxidant (C) may be used alone or in combination of two or more.
リン含有フェノール系酸化防止剤（Ｃ）は、１種を単独で用いてもよく、２種以上を組み合わせて用いてもよい。 As the phosphorus-containing phenolic antioxidant (C), a phosphorus-containing phenolic antioxidant that is commonly used as an antioxidant for lubricating oil compositions can be used.
The phosphorus-containing phenolic antioxidant (C) may be used alone or in combination of two or more.
ここで、本実施形態の潤滑油組成物においてリン含有フェノール系酸化防止剤（Ｃ）は、本発明の効果をより向上させやすくする観点から、下記一般式（ｃ１）で表される化合物（Ｃ１）を含むことが好ましい。
リン含有フェノール系酸化防止剤（Ｃ）中の化合物（Ｃ１）の含有量は、同様の観点から、リン含有フェノール系酸化防止剤（Ｃ）の全量基準で、好ましくは５０質量％～１００質量％、より好ましくは６０質量％～１００質量％、更に好ましくは７０質量％～１００質量％、より更に好ましくは８０質量％～１００質量％、更になお好ましくは９０質量％～１００質量％、一層好ましくは９５質量％～１００質量％である。 Here, in the lubricating oil composition of the present embodiment, the phosphorus-containing phenolic antioxidant (C) is a compound represented by the following general formula (c1) (C1 ) is preferably included.
From the same point of view, the content of the compound (C1) in the phosphorus-containing phenolic antioxidant (C) is preferably 50% by mass to 100% by mass based on the total amount of the phosphorus-containing phenolic antioxidant (C). , more preferably 60% to 100% by weight, even more preferably 70% to 100% by weight, even more preferably 80% to 100% by weight, even more preferably 90% to 100% by weight, even more preferably It is 95% by mass to 100% by mass.
リン含有フェノール系酸化防止剤（Ｃ）中の化合物（Ｃ１）の含有量は、同様の観点から、リン含有フェノール系酸化防止剤（Ｃ）の全量基準で、好ましくは５０質量％～１００質量％、より好ましくは６０質量％～１００質量％、更に好ましくは７０質量％～１００質量％、より更に好ましくは８０質量％～１００質量％、更になお好ましくは９０質量％～１００質量％、一層好ましくは９５質量％～１００質量％である。 Here, in the lubricating oil composition of the present embodiment, the phosphorus-containing phenolic antioxidant (C) is a compound represented by the following general formula (c1) (C1 ) is preferably included.
From the same point of view, the content of the compound (C1) in the phosphorus-containing phenolic antioxidant (C) is preferably 50% by mass to 100% by mass based on the total amount of the phosphorus-containing phenolic antioxidant (C). , more preferably 60% to 100% by weight, even more preferably 70% to 100% by weight, even more preferably 80% to 100% by weight, even more preferably 90% to 100% by weight, even more preferably It is 95% by mass to 100% by mass.
上記一般式（ｃ１）中、Ｒｃ１、Ｒｃ２、Ｒｃ３、及びＲｃ４は、各々独立に、水素原子又は炭素数１～３０のアルキル基である。
当該アルキル基の炭素数が１～３０であると、本発明の効果がより向上しやすくなる。
Ｒｃ１、Ｒｃ２、Ｒｃ３、及びＲｃ４として選択し得るアルキル基としては、上述のＲａ１及びＲａ２として選択し得るアルキル基と同じものが挙げられる。
但し、Ｒｃ１、Ｒｃ２、Ｒｃ３、及びＲｃ４として選択し得るアルキル基の炭素数としては、本発明の効果をより向上させやすくする観点から、各々独立に、好ましくは１～２０、より好ましくは１～１０、更に好ましくは１～６である。
ここで、化合物（Ｃ１）は、本発明の効果をさらに向上させやすくする観点から、ヒンダードフェノール骨格を有することが好ましい。したがって、Ｒｃ１及びＲｃ２として選択し得るアルキル基は、分岐鎖アルキル基であることが好ましく、炭素数１～６の分岐鎖アルキル基であることがより好ましく、ｔｅｒｔ－ブチル基であることが更に好ましい。 In the above general formula (c1), R c1 , R c2 , R c3 and R c4 are each independently a hydrogen atom or an alkyl group having 1 to 30 carbon atoms.
When the alkyl group has 1 to 30 carbon atoms, the effects of the present invention are more likely to be improved.
Examples of the alkyl groups that can be selected as R c1 , R c2 , R c3 , and R c4 include the same alkyl groups that can be selected as R a1 and R a2 described above.
However, the number of carbon atoms in the alkyl groups that can be selected as R c1 , R c2 , R c3 , and R c4 is preferably 1 to 20, preferably 1 to 20, and preferably 1 to 20, from the viewpoint of improving the effects of the present invention. The number is preferably 1 to 10, more preferably 1 to 6.
Here, the compound (C1) preferably has a hindered phenol skeleton from the viewpoint of further improving the effects of the present invention. Therefore, the alkyl group that can be selected as R c1 and R c2 is preferably a branched alkyl group, more preferably a branched alkyl group having 1 to 6 carbon atoms, and preferably a tert-butyl group. More preferred.
当該アルキル基の炭素数が１～３０であると、本発明の効果がより向上しやすくなる。
Ｒｃ１、Ｒｃ２、Ｒｃ３、及びＲｃ４として選択し得るアルキル基としては、上述のＲａ１及びＲａ２として選択し得るアルキル基と同じものが挙げられる。
但し、Ｒｃ１、Ｒｃ２、Ｒｃ３、及びＲｃ４として選択し得るアルキル基の炭素数としては、本発明の効果をより向上させやすくする観点から、各々独立に、好ましくは１～２０、より好ましくは１～１０、更に好ましくは１～６である。
ここで、化合物（Ｃ１）は、本発明の効果をさらに向上させやすくする観点から、ヒンダードフェノール骨格を有することが好ましい。したがって、Ｒｃ１及びＲｃ２として選択し得るアルキル基は、分岐鎖アルキル基であることが好ましく、炭素数１～６の分岐鎖アルキル基であることがより好ましく、ｔｅｒｔ－ブチル基であることが更に好ましい。 In the above general formula (c1), R c1 , R c2 , R c3 and R c4 are each independently a hydrogen atom or an alkyl group having 1 to 30 carbon atoms.
When the alkyl group has 1 to 30 carbon atoms, the effects of the present invention are more likely to be improved.
Examples of the alkyl groups that can be selected as R c1 , R c2 , R c3 , and R c4 include the same alkyl groups that can be selected as R a1 and R a2 described above.
However, the number of carbon atoms in the alkyl groups that can be selected as R c1 , R c2 , R c3 , and R c4 is preferably 1 to 20, preferably 1 to 20, and preferably 1 to 20, from the viewpoint of improving the effects of the present invention. The number is preferably 1 to 10, more preferably 1 to 6.
Here, the compound (C1) preferably has a hindered phenol skeleton from the viewpoint of further improving the effects of the present invention. Therefore, the alkyl group that can be selected as R c1 and R c2 is preferably a branched alkyl group, more preferably a branched alkyl group having 1 to 6 carbon atoms, and preferably a tert-butyl group. More preferred.
上記一般式（ｃ１）中、Ｒｃ５は、炭素数１～５のアルキレン基である。
Ｒｃ５として選択し得るアルキレン基の炭素数は、本発明の効果をより向上させやすくする観点から、好ましくは１～４、より好ましくは１～３、更に好ましくは１～２、より更に好ましくは１である。
Ｒｃ５として選択し得るアルキレン基の具体例としては、メチレン基、エチレン基、ｎ－プロピレン基、ｎ－ブチレン基、ｎ－ペンチレン基等の直鎖状のアルキレン基；イソプロピレン基、イソブチレン基、ｓｅｃ－ブチレン、ｔｅｒｔ－ブチレン基、イソペンチレン基、ネオペンチレン基などの分枝鎖状アルキレン基等が挙げられる。これらの中でも、メチレン基が好ましい。 In the above general formula (c1), R c5 is an alkylene group having 1 to 5 carbon atoms.
The number of carbon atoms in the alkylene group that can be selected as R c5 is preferably 1 to 4, more preferably 1 to 3, still more preferably 1 to 2, and even more preferably It is 1.
Specific examples of alkylene groups that can be selected as R c5 include linear alkylene groups such as methylene group, ethylene group, n-propylene group, n-butylene group, and n-pentylene group; isopropylene group, isobutylene group, Examples include branched alkylene groups such as sec-butylene, tert-butylene, isopentylene, and neopentylene. Among these, methylene group is preferred.
Ｒｃ５として選択し得るアルキレン基の炭素数は、本発明の効果をより向上させやすくする観点から、好ましくは１～４、より好ましくは１～３、更に好ましくは１～２、より更に好ましくは１である。
Ｒｃ５として選択し得るアルキレン基の具体例としては、メチレン基、エチレン基、ｎ－プロピレン基、ｎ－ブチレン基、ｎ－ペンチレン基等の直鎖状のアルキレン基；イソプロピレン基、イソブチレン基、ｓｅｃ－ブチレン、ｔｅｒｔ－ブチレン基、イソペンチレン基、ネオペンチレン基などの分枝鎖状アルキレン基等が挙げられる。これらの中でも、メチレン基が好ましい。 In the above general formula (c1), R c5 is an alkylene group having 1 to 5 carbon atoms.
The number of carbon atoms in the alkylene group that can be selected as R c5 is preferably 1 to 4, more preferably 1 to 3, still more preferably 1 to 2, and even more preferably It is 1.
Specific examples of alkylene groups that can be selected as R c5 include linear alkylene groups such as methylene group, ethylene group, n-propylene group, n-butylene group, and n-pentylene group; isopropylene group, isobutylene group, Examples include branched alkylene groups such as sec-butylene, tert-butylene, isopentylene, and neopentylene. Among these, methylene group is preferred.
化合物（Ｃ１）は、１種を単独で用いてもよく、２種以上を組み合わせて用いてもよい。
One type of compound (C1) may be used alone, or two or more types may be used in combination.
＜リン非含有フェノール系酸化防止剤（Ｄ）＞
本実施形態の潤滑油組成物は、本発明の効果をより向上させやすくする観点から、さらに、リン非含有フェノール系酸化防止剤（Ｄ）を含有することが好ましい。 <Phosphorus-free phenolic antioxidant (D)>
It is preferable that the lubricating oil composition of this embodiment further contains a phosphorus-free phenolic antioxidant (D) from the viewpoint of making it easier to improve the effects of the present invention.
本実施形態の潤滑油組成物は、本発明の効果をより向上させやすくする観点から、さらに、リン非含有フェノール系酸化防止剤（Ｄ）を含有することが好ましい。 <Phosphorus-free phenolic antioxidant (D)>
It is preferable that the lubricating oil composition of this embodiment further contains a phosphorus-free phenolic antioxidant (D) from the viewpoint of making it easier to improve the effects of the present invention.
リン非含有フェノール系酸化防止剤（Ｄ）としては、潤滑油組成物用の酸化防止剤として一般的に用いられるリン非含有フェノール系酸化防止剤を用いることができる。
リン非含有フェノール系酸化防止剤（Ｄ）は、１種を単独で用いてもよく、２種以上を組み合わせて用いてもよい。 As the phosphorus-free phenolic antioxidant (D), a phosphorus-free phenolic antioxidant commonly used as an antioxidant for lubricating oil compositions can be used.
The phosphorus-free phenolic antioxidant (D) may be used alone or in combination of two or more.
リン非含有フェノール系酸化防止剤（Ｄ）は、１種を単独で用いてもよく、２種以上を組み合わせて用いてもよい。 As the phosphorus-free phenolic antioxidant (D), a phosphorus-free phenolic antioxidant commonly used as an antioxidant for lubricating oil compositions can be used.
The phosphorus-free phenolic antioxidant (D) may be used alone or in combination of two or more.
ここで、本実施形態の潤滑油組成物において、リン非含有フェノール系酸化防止剤（Ｄ）は、本発明の効果をさらに向上させやすくする観点から、下記一般式（ｄ１）で表される化合物（Ｄ１）を含むことが好ましい。
リン非含有フェノール系酸化防止剤（Ｄ）中の化合物（Ｄ１）の含有量は、同様の観点から、リン含有フェノール系酸化防止剤（Ｄ）の全量基準で、好ましくは５０質量％～１００質量％、より好ましくは６０質量％～１００質量％、更に好ましくは７０質量％～１００質量％、より更に好ましくは８０質量％～１００質量％、更になお好ましくは９０質量％～１００質量％、一層好ましくは９５質量％～１００質量％である。 Here, in the lubricating oil composition of the present embodiment, the phosphorus-free phenolic antioxidant (D) is a compound represented by the following general formula (d1) from the viewpoint of further improving the effects of the present invention. It is preferable that (D1) is included.
From the same point of view, the content of the compound (D1) in the phosphorus-free phenolic antioxidant (D) is preferably 50% by mass to 100% by mass based on the total amount of the phosphorus-containing phenolic antioxidant (D). %, more preferably 60% to 100% by weight, even more preferably 70% to 100% by weight, even more preferably 80% to 100% by weight, even more preferably 90% to 100% by weight, even more preferably is 95% to 100% by mass.
リン非含有フェノール系酸化防止剤（Ｄ）中の化合物（Ｄ１）の含有量は、同様の観点から、リン含有フェノール系酸化防止剤（Ｄ）の全量基準で、好ましくは５０質量％～１００質量％、より好ましくは６０質量％～１００質量％、更に好ましくは７０質量％～１００質量％、より更に好ましくは８０質量％～１００質量％、更になお好ましくは９０質量％～１００質量％、一層好ましくは９５質量％～１００質量％である。 Here, in the lubricating oil composition of the present embodiment, the phosphorus-free phenolic antioxidant (D) is a compound represented by the following general formula (d1) from the viewpoint of further improving the effects of the present invention. It is preferable that (D1) is included.
From the same point of view, the content of the compound (D1) in the phosphorus-free phenolic antioxidant (D) is preferably 50% by mass to 100% by mass based on the total amount of the phosphorus-containing phenolic antioxidant (D). %, more preferably 60% to 100% by weight, even more preferably 70% to 100% by weight, even more preferably 80% to 100% by weight, even more preferably 90% to 100% by weight, even more preferably is 95% to 100% by mass.
上記式（ｄ１）中、Ｒｄ１は、炭素数１～５のアルキレン基である。
Ｒｄ１として選択し得るアルキレン基の炭素数は、本発明の効果をより向上させやすくする観点から、好ましくは１～４、より好ましくは１～３、更に好ましくは１～２である。
Ｒｄ１として選択し得るアルキレン基の具体例としては、メチレン基、エチレン基、ｎ－プロピレン基、ｎ－ブチレン基、ｎ－ペンチレン基等の直鎖状のアルキレン基；イソプロピレン基、イソブチレン基、ｓｅｃ－ブチレン、ｔｅｒｔ－ブチレン基、イソペンチレン基、ネオペンチレン基などの分枝鎖状アルキレン基等が挙げられる。 In the above formula (d1), R d1 is an alkylene group having 1 to 5 carbon atoms.
The number of carbon atoms in the alkylene group that can be selected as R d1 is preferably 1 to 4, more preferably 1 to 3, and even more preferably 1 to 2, from the viewpoint of improving the effects of the present invention.
Specific examples of alkylene groups that can be selected as R d1 include linear alkylene groups such as methylene group, ethylene group, n-propylene group, n-butylene group, and n-pentylene group; isopropylene group, isobutylene group, Examples include branched alkylene groups such as sec-butylene, tert-butylene, isopentylene, and neopentylene.
Ｒｄ１として選択し得るアルキレン基の炭素数は、本発明の効果をより向上させやすくする観点から、好ましくは１～４、より好ましくは１～３、更に好ましくは１～２である。
Ｒｄ１として選択し得るアルキレン基の具体例としては、メチレン基、エチレン基、ｎ－プロピレン基、ｎ－ブチレン基、ｎ－ペンチレン基等の直鎖状のアルキレン基；イソプロピレン基、イソブチレン基、ｓｅｃ－ブチレン、ｔｅｒｔ－ブチレン基、イソペンチレン基、ネオペンチレン基などの分枝鎖状アルキレン基等が挙げられる。 In the above formula (d1), R d1 is an alkylene group having 1 to 5 carbon atoms.
The number of carbon atoms in the alkylene group that can be selected as R d1 is preferably 1 to 4, more preferably 1 to 3, and even more preferably 1 to 2, from the viewpoint of improving the effects of the present invention.
Specific examples of alkylene groups that can be selected as R d1 include linear alkylene groups such as methylene group, ethylene group, n-propylene group, n-butylene group, and n-pentylene group; isopropylene group, isobutylene group, Examples include branched alkylene groups such as sec-butylene, tert-butylene, isopentylene, and neopentylene.
上記式（ｄ１）中、Ｒｄ２は、炭素数１～２５のアルキル基である。
Ｒｄ２として選択し得るアルキル基の炭素数は、本発明の効果をより向上させやすくする観点から、好ましくは２以上、より好ましくは４以上、更に好ましくは６以上である。また、好ましくは２０以下、より好ましくは１５以下、更に好ましくは１０以下である。これらの数値範囲の上限値及び下限値は任意に組み合わせることができる。具体的には、好ましくは２～２０、より好ましくは４～１５、更に好ましくは６～１０である。
Ｒｄ２として選択し得るアルキル基の具体例としては、メチル基、エチル基、プロピル基、ブチル基、ペンチル基、ヘキシル基、ヘプチル基、オクチル基、ノニル基、デシル基、ウンデシル基、ドデシル基、トリデシル基、テトラデシル基、ペンタデシル基、ヘキサデシル基、ヘプタデシル基、オクタデシル基、ノナデシル基、イコシル基、ヘンイコシル基、ドコシル基、トリコシル基、テトラコシル基、ペンタコシル基等が挙げられる。これらは、直鎖状であっても分岐鎖状であってもよい。 In the above formula (d1), R d2 is an alkyl group having 1 to 25 carbon atoms.
The number of carbon atoms in the alkyl group that can be selected as R d2 is preferably 2 or more, more preferably 4 or more, still more preferably 6 or more, from the viewpoint of improving the effects of the present invention. Further, it is preferably 20 or less, more preferably 15 or less, even more preferably 10 or less. The upper and lower limits of these numerical ranges can be arbitrarily combined. Specifically, it is preferably 2 to 20, more preferably 4 to 15, and still more preferably 6 to 10.
Specific examples of alkyl groups that can be selected as R d2 include methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, Examples include tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group, henicosyl group, docosyl group, tricosyl group, tetracosyl group, pentacosyl group, and the like. These may be linear or branched.
Ｒｄ２として選択し得るアルキル基の炭素数は、本発明の効果をより向上させやすくする観点から、好ましくは２以上、より好ましくは４以上、更に好ましくは６以上である。また、好ましくは２０以下、より好ましくは１５以下、更に好ましくは１０以下である。これらの数値範囲の上限値及び下限値は任意に組み合わせることができる。具体的には、好ましくは２～２０、より好ましくは４～１５、更に好ましくは６～１０である。
Ｒｄ２として選択し得るアルキル基の具体例としては、メチル基、エチル基、プロピル基、ブチル基、ペンチル基、ヘキシル基、ヘプチル基、オクチル基、ノニル基、デシル基、ウンデシル基、ドデシル基、トリデシル基、テトラデシル基、ペンタデシル基、ヘキサデシル基、ヘプタデシル基、オクタデシル基、ノナデシル基、イコシル基、ヘンイコシル基、ドコシル基、トリコシル基、テトラコシル基、ペンタコシル基等が挙げられる。これらは、直鎖状であっても分岐鎖状であってもよい。 In the above formula (d1), R d2 is an alkyl group having 1 to 25 carbon atoms.
The number of carbon atoms in the alkyl group that can be selected as R d2 is preferably 2 or more, more preferably 4 or more, still more preferably 6 or more, from the viewpoint of improving the effects of the present invention. Further, it is preferably 20 or less, more preferably 15 or less, even more preferably 10 or less. The upper and lower limits of these numerical ranges can be arbitrarily combined. Specifically, it is preferably 2 to 20, more preferably 4 to 15, and still more preferably 6 to 10.
Specific examples of alkyl groups that can be selected as R d2 include methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, Examples include tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group, henicosyl group, docosyl group, tricosyl group, tetracosyl group, pentacosyl group, and the like. These may be linear or branched.
化合物（Ｄ１）は、１種を単独で用いてもよく、２種以上を組み合わせて用いてもよい。
One type of compound (D1) may be used alone, or two or more types may be used in combination.
＜成分（Ｂ）と成分（Ａ）との含有比率［（Ｂ）／（Ａ）］＞
本実施形態の潤滑油組成物は、ナフチルアミン系酸化防止剤（Ｂ）とジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上であることを要する。
［（Ｂ）／（Ａ）］が２．０未満である場合、本発明の効果が発揮されなくなる。
ここで、本発明の効果をより向上させやすくする観点から、［（Ｂ）／（Ａ）］は、質量比で、好ましくは２．１以上、より好ましくは２．２以上、更に好ましくは２．３以上である。また、好ましくは３．５以下、より好ましくは３．２以下、更に好ましくは３．０以下である。
これらの数値範囲の上限値及び下限値は任意に組み合わせることができる。具体的には、好ましくは２．１～３．５、より好ましくは２．２～３．２、更に好ましくは２．３～３．０である。 <Content ratio of component (B) and component (A) [(B)/(A)]>
In the lubricating oil composition of the present embodiment, the content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio. It is required that
If [(B)/(A)] is less than 2.0, the effects of the present invention will not be exhibited.
Here, from the viewpoint of making it easier to improve the effects of the present invention, [(B)/(A)] is preferably 2.1 or more, more preferably 2.2 or more, and still more preferably 2. .3 or more. Further, it is preferably 3.5 or less, more preferably 3.2 or less, and even more preferably 3.0 or less.
The upper and lower limits of these numerical ranges can be arbitrarily combined. Specifically, it is preferably 2.1 to 3.5, more preferably 2.2 to 3.2, and even more preferably 2.3 to 3.0.
本実施形態の潤滑油組成物は、ナフチルアミン系酸化防止剤（Ｂ）とジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上であることを要する。
［（Ｂ）／（Ａ）］が２．０未満である場合、本発明の効果が発揮されなくなる。
ここで、本発明の効果をより向上させやすくする観点から、［（Ｂ）／（Ａ）］は、質量比で、好ましくは２．１以上、より好ましくは２．２以上、更に好ましくは２．３以上である。また、好ましくは３．５以下、より好ましくは３．２以下、更に好ましくは３．０以下である。
これらの数値範囲の上限値及び下限値は任意に組み合わせることができる。具体的には、好ましくは２．１～３．５、より好ましくは２．２～３．２、更に好ましくは２．３～３．０である。 <Content ratio of component (B) and component (A) [(B)/(A)]>
In the lubricating oil composition of the present embodiment, the content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio. It is required that
If [(B)/(A)] is less than 2.0, the effects of the present invention will not be exhibited.
Here, from the viewpoint of making it easier to improve the effects of the present invention, [(B)/(A)] is preferably 2.1 or more, more preferably 2.2 or more, and still more preferably 2. .3 or more. Further, it is preferably 3.5 or less, more preferably 3.2 or less, and even more preferably 3.0 or less.
The upper and lower limits of these numerical ranges can be arbitrarily combined. Specifically, it is preferably 2.1 to 3.5, more preferably 2.2 to 3.2, and even more preferably 2.3 to 3.0.
＜成分（Ｃ）と成分（Ｂ）との含有比率［（Ｃ）／（Ｂ）］＞
本実施形態の潤滑油組成物は、リン含有フェノール系酸化防止剤（Ｃ）とナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下であることを要する。
［（Ｃ）／（Ｂ）］が０．１５超である場合、本発明の効果が発揮されなくなる。
ここで、本発明の効果をより向上させやすくする観点から、［（Ｃ）／（Ｂ）］は、質量比で、好ましくは０．１４以下、より好ましくは０．１２以下、更に好ましくは０．１０以下である。また、好ましくは０．０３以上、より好ましくは０．０４以上、更に好ましくは０．０５以上である。
これらの数値範囲の上限値及び下限値は任意に組み合わせることができる。具体的には、好ましくは０．０３～０．１４、より好ましくは０．０４～０．１２、更に好ましくは０．０５～０．１０である。 <Content ratio of component (C) and component (B) [(C)/(B)]>
In the lubricating oil composition of the present embodiment, the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0. Must be 15 or less.
When [(C)/(B)] is more than 0.15, the effects of the present invention are no longer exhibited.
Here, from the viewpoint of making it easier to improve the effects of the present invention, [(C)/(B)] is preferably 0.14 or less, more preferably 0.12 or less, and even more preferably 0. .10 or less. Moreover, it is preferably 0.03 or more, more preferably 0.04 or more, and still more preferably 0.05 or more.
The upper and lower limits of these numerical ranges can be arbitrarily combined. Specifically, it is preferably 0.03 to 0.14, more preferably 0.04 to 0.12, and still more preferably 0.05 to 0.10.
本実施形態の潤滑油組成物は、リン含有フェノール系酸化防止剤（Ｃ）とナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下であることを要する。
［（Ｃ）／（Ｂ）］が０．１５超である場合、本発明の効果が発揮されなくなる。
ここで、本発明の効果をより向上させやすくする観点から、［（Ｃ）／（Ｂ）］は、質量比で、好ましくは０．１４以下、より好ましくは０．１２以下、更に好ましくは０．１０以下である。また、好ましくは０．０３以上、より好ましくは０．０４以上、更に好ましくは０．０５以上である。
これらの数値範囲の上限値及び下限値は任意に組み合わせることができる。具体的には、好ましくは０．０３～０．１４、より好ましくは０．０４～０．１２、更に好ましくは０．０５～０．１０である。 <Content ratio of component (C) and component (B) [(C)/(B)]>
In the lubricating oil composition of the present embodiment, the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0. Must be 15 or less.
When [(C)/(B)] is more than 0.15, the effects of the present invention are no longer exhibited.
Here, from the viewpoint of making it easier to improve the effects of the present invention, [(C)/(B)] is preferably 0.14 or less, more preferably 0.12 or less, and even more preferably 0. .10 or less. Moreover, it is preferably 0.03 or more, more preferably 0.04 or more, and still more preferably 0.05 or more.
The upper and lower limits of these numerical ranges can be arbitrarily combined. Specifically, it is preferably 0.03 to 0.14, more preferably 0.04 to 0.12, and still more preferably 0.05 to 0.10.
＜成分（Ａ）と成分（Ｂ）と成分（Ｃ）との合計含有量＞
本実施形態の潤滑油組成物は、ジフェニルアミン系酸化防止剤（Ａ）とナフチルアミン系酸化防止剤（Ｂ）とリン含有フェノール系酸化防止剤（Ｃ）との合計含有量が、潤滑油組成物の全量基準で、好ましくは０．３０質量％以上である。
当該合計含有量がこの範囲にあることで、本発明の効果を向上させやすい。
ここで、本発明の効果をより向上させやすくする観点から、当該合計含有量は、好ましくは０．６０質量％以上、より好ましくは０．８０質量％以上、更に好ましくは１．０質量％以上である。また、成分（Ａ）と成分（Ｂ）と成分（Ｃ）との過剰な添加を抑えつつ、添加量に見合った効果を得る観点から、好ましくは５．０質量％以下、より好ましくは４．０質量％以下、更に好ましくは３．０質量％以下である。
これらの数値範囲の上限値及び下限値は任意に組み合わせることができる。具体的には、好ましくは０．６０質量％～５．０質量％、より好ましくは０．８０質量％～４．０質量％、更に好ましくは１．０質量％～３．０質量％である。 <Total content of component (A), component (B), and component (C)>
In the lubricating oil composition of the present embodiment, the total content of the diphenylamine antioxidant (A), the naphthylamine antioxidant (B), and the phosphorus-containing phenolic antioxidant (C) is the same as that of the lubricating oil composition. Based on the total amount, it is preferably 0.30% by mass or more.
When the total content is within this range, the effects of the present invention can be easily improved.
Here, from the viewpoint of making it easier to improve the effects of the present invention, the total content is preferably 0.60% by mass or more, more preferably 0.80% by mass or more, and even more preferably 1.0% by mass or more. It is. In addition, from the viewpoint of suppressing excessive addition of component (A), component (B), and component (C) and obtaining an effect commensurate with the amount added, preferably 5.0% by mass or less, more preferably 4.0% by mass or less. It is 0% by mass or less, more preferably 3.0% by mass or less.
The upper and lower limits of these numerical ranges can be arbitrarily combined. Specifically, it is preferably 0.60% by mass to 5.0% by mass, more preferably 0.80% by mass to 4.0% by mass, and even more preferably 1.0% by mass to 3.0% by mass. .
本実施形態の潤滑油組成物は、ジフェニルアミン系酸化防止剤（Ａ）とナフチルアミン系酸化防止剤（Ｂ）とリン含有フェノール系酸化防止剤（Ｃ）との合計含有量が、潤滑油組成物の全量基準で、好ましくは０．３０質量％以上である。
当該合計含有量がこの範囲にあることで、本発明の効果を向上させやすい。
ここで、本発明の効果をより向上させやすくする観点から、当該合計含有量は、好ましくは０．６０質量％以上、より好ましくは０．８０質量％以上、更に好ましくは１．０質量％以上である。また、成分（Ａ）と成分（Ｂ）と成分（Ｃ）との過剰な添加を抑えつつ、添加量に見合った効果を得る観点から、好ましくは５．０質量％以下、より好ましくは４．０質量％以下、更に好ましくは３．０質量％以下である。
これらの数値範囲の上限値及び下限値は任意に組み合わせることができる。具体的には、好ましくは０．６０質量％～５．０質量％、より好ましくは０．８０質量％～４．０質量％、更に好ましくは１．０質量％～３．０質量％である。 <Total content of component (A), component (B), and component (C)>
In the lubricating oil composition of the present embodiment, the total content of the diphenylamine antioxidant (A), the naphthylamine antioxidant (B), and the phosphorus-containing phenolic antioxidant (C) is the same as that of the lubricating oil composition. Based on the total amount, it is preferably 0.30% by mass or more.
When the total content is within this range, the effects of the present invention can be easily improved.
Here, from the viewpoint of making it easier to improve the effects of the present invention, the total content is preferably 0.60% by mass or more, more preferably 0.80% by mass or more, and even more preferably 1.0% by mass or more. It is. In addition, from the viewpoint of suppressing excessive addition of component (A), component (B), and component (C) and obtaining an effect commensurate with the amount added, preferably 5.0% by mass or less, more preferably 4.0% by mass or less. It is 0% by mass or less, more preferably 3.0% by mass or less.
The upper and lower limits of these numerical ranges can be arbitrarily combined. Specifically, it is preferably 0.60% by mass to 5.0% by mass, more preferably 0.80% by mass to 4.0% by mass, and even more preferably 1.0% by mass to 3.0% by mass. .
＜成分（Ａ）の含有量＞
本実施形態の潤滑油組成物において、ジフェニルアミン系酸化防止剤（Ａ）の含有量は、本発明の効果をより向上させやすくする観点から、潤滑油組成物の全量基準で、好ましくは０．０８質量％～１．５質量％、より好ましくは０．１０質量％～１．０質量％、更に好ましくは、０．２０質量％～０．８０質量％である。 <Content of component (A)>
In the lubricating oil composition of the present embodiment, the content of the diphenylamine antioxidant (A) is preferably 0.08% based on the total amount of the lubricating oil composition, from the viewpoint of making it easier to improve the effects of the present invention. The content is from 1.5% by weight, more preferably from 0.10% to 1.0% by weight, even more preferably from 0.20% to 0.80% by weight.
本実施形態の潤滑油組成物において、ジフェニルアミン系酸化防止剤（Ａ）の含有量は、本発明の効果をより向上させやすくする観点から、潤滑油組成物の全量基準で、好ましくは０．０８質量％～１．５質量％、より好ましくは０．１０質量％～１．０質量％、更に好ましくは、０．２０質量％～０．８０質量％である。 <Content of component (A)>
In the lubricating oil composition of the present embodiment, the content of the diphenylamine antioxidant (A) is preferably 0.08% based on the total amount of the lubricating oil composition, from the viewpoint of making it easier to improve the effects of the present invention. The content is from 1.5% by weight, more preferably from 0.10% to 1.0% by weight, even more preferably from 0.20% to 0.80% by weight.
＜成分（Ｂ）の含有量＞
本実施形態の潤滑油組成物において、ナフチルアミン系酸化防止剤（Ｂ）の含有量は、本発明の効果をより向上させやすくする観点から、潤滑油組成物の全量基準で、好ましくは０．２２質量％～３．１質量％、より好ましくは０．４０質量％～２．５質量％、更に好ましくは、０．６０質量％～２．０質量％である。 <Content of component (B)>
In the lubricating oil composition of the present embodiment, the content of the naphthylamine antioxidant (B) is preferably 0.22% based on the total amount of the lubricating oil composition, from the viewpoint of making it easier to improve the effects of the present invention. The amount is from 3.1% by weight, more preferably from 0.40% to 2.5% by weight, and even more preferably from 0.60% to 2.0% by weight.
本実施形態の潤滑油組成物において、ナフチルアミン系酸化防止剤（Ｂ）の含有量は、本発明の効果をより向上させやすくする観点から、潤滑油組成物の全量基準で、好ましくは０．２２質量％～３．１質量％、より好ましくは０．４０質量％～２．５質量％、更に好ましくは、０．６０質量％～２．０質量％である。 <Content of component (B)>
In the lubricating oil composition of the present embodiment, the content of the naphthylamine antioxidant (B) is preferably 0.22% based on the total amount of the lubricating oil composition, from the viewpoint of making it easier to improve the effects of the present invention. The amount is from 3.1% by weight, more preferably from 0.40% to 2.5% by weight, and even more preferably from 0.60% to 2.0% by weight.
＜成分（Ｃ）の含有量＞
本実施形態の潤滑油組成物において、リン含有フェノール系酸化防止剤（Ｃ）の含有量は、本発明の効果をより向上させやすくする観点から、潤滑油組成物の全量基準で、好ましくは０．００５質量％～０．４０質量％、より好ましくは０．０１０質量％～０．３０質量％、更に好ましくは、０．０１５質量％～０．２０質量％である。 <Content of component (C)>
In the lubricating oil composition of the present embodiment, the content of the phosphorus-containing phenolic antioxidant (C) is preferably 0 on the basis of the total amount of the lubricating oil composition, from the viewpoint of making it easier to improve the effects of the present invention. 0.005% to 0.40% by weight, more preferably 0.010% to 0.30% by weight, even more preferably 0.015% to 0.20% by weight.
本実施形態の潤滑油組成物において、リン含有フェノール系酸化防止剤（Ｃ）の含有量は、本発明の効果をより向上させやすくする観点から、潤滑油組成物の全量基準で、好ましくは０．００５質量％～０．４０質量％、より好ましくは０．０１０質量％～０．３０質量％、更に好ましくは、０．０１５質量％～０．２０質量％である。 <Content of component (C)>
In the lubricating oil composition of the present embodiment, the content of the phosphorus-containing phenolic antioxidant (C) is preferably 0 on the basis of the total amount of the lubricating oil composition, from the viewpoint of making it easier to improve the effects of the present invention. 0.005% to 0.40% by weight, more preferably 0.010% to 0.30% by weight, even more preferably 0.015% to 0.20% by weight.
＜成分（Ｄ）の含有量＞
本実施形態の潤滑油組成物がリン非含有フェノール系酸化防止剤（Ｄ）を含有する場合、リン非含有フェノール系酸化防止剤（Ｄ）の含有量は、本発明の効果をより向上させやすくする観点から、潤滑油組成物の全量基準で、好ましくは０．４０質量％～５．０質量％、より好ましくは０．９０質量％～４．０質量％、更に好ましくは、１．５質量％～３．０質量％である。 <Content of component (D)>
When the lubricating oil composition of the present embodiment contains a phosphorus-free phenolic antioxidant (D), the content of the phosphorus-free phenolic antioxidant (D) can more easily improve the effects of the present invention. From the viewpoint of % to 3.0% by mass.
本実施形態の潤滑油組成物がリン非含有フェノール系酸化防止剤（Ｄ）を含有する場合、リン非含有フェノール系酸化防止剤（Ｄ）の含有量は、本発明の効果をより向上させやすくする観点から、潤滑油組成物の全量基準で、好ましくは０．４０質量％～５．０質量％、より好ましくは０．９０質量％～４．０質量％、更に好ましくは、１．５質量％～３．０質量％である。 <Content of component (D)>
When the lubricating oil composition of the present embodiment contains a phosphorus-free phenolic antioxidant (D), the content of the phosphorus-free phenolic antioxidant (D) can more easily improve the effects of the present invention. From the viewpoint of % to 3.0% by mass.
＜成分（Ａ）と成分（Ｂ）と成分（Ｃ）の合計含有量に対する成分（Ｄ）の含有量＞
本実施形態の潤滑油組成物がリン非含有フェノール系酸化防止剤（Ｄ）を含有する場合、ジフェニルアミン系酸化防止剤（Ａ）とナフチルアミン系酸化防止剤（Ｂ）とリン含有フェノール系酸化防止剤（Ｃ）との合計含有量に対するリン非含有フェノール系酸化防止剤（Ｄ）の含有量［（Ｄ）／｛（Ａ）＋（Ｂ）＋（Ｃ）｝］は、質量比で、好ましくは０．５０～１０．０、より好ましくは０．７０～８．０、更に好ましくは０．８０～６．０である。 <Content of component (D) relative to the total content of component (A), component (B), and component (C)>
When the lubricating oil composition of the present embodiment contains a phosphorus-free phenolic antioxidant (D), a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant The content of the phosphorus-free phenolic antioxidant (D) relative to the total content with (C) [(D)/{(A)+(B)+(C)}] is expressed as a mass ratio, preferably It is 0.50 to 10.0, more preferably 0.70 to 8.0, and even more preferably 0.80 to 6.0.
本実施形態の潤滑油組成物がリン非含有フェノール系酸化防止剤（Ｄ）を含有する場合、ジフェニルアミン系酸化防止剤（Ａ）とナフチルアミン系酸化防止剤（Ｂ）とリン含有フェノール系酸化防止剤（Ｃ）との合計含有量に対するリン非含有フェノール系酸化防止剤（Ｄ）の含有量［（Ｄ）／｛（Ａ）＋（Ｂ）＋（Ｃ）｝］は、質量比で、好ましくは０．５０～１０．０、より好ましくは０．７０～８．０、更に好ましくは０．８０～６．０である。 <Content of component (D) relative to the total content of component (A), component (B), and component (C)>
When the lubricating oil composition of the present embodiment contains a phosphorus-free phenolic antioxidant (D), a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant The content of the phosphorus-free phenolic antioxidant (D) relative to the total content with (C) [(D)/{(A)+(B)+(C)}] is expressed as a mass ratio, preferably It is 0.50 to 10.0, more preferably 0.70 to 8.0, and even more preferably 0.80 to 6.0.
＜潤滑油用添加剤＞
本実施形態の潤滑油組成物は、本発明の効果を損なわない範囲で、成分（Ａ）～（Ｄ）以外の潤滑油用添加剤を含有してもよい。
当該潤滑油用添加剤としては、例えば、極圧剤、清浄分散剤、流動点降下剤、粘度指数向上剤、防錆剤、金属不活性化剤、消泡剤、及び摩擦調整剤等が挙げられる。
これらの潤滑油用添加剤は、１種を単独で用いてもよく、２種以上を組み合わせて用いてもよい。 <Additives for lubricating oil>
The lubricating oil composition of the present embodiment may contain lubricating oil additives other than components (A) to (D) to the extent that the effects of the present invention are not impaired.
Examples of such lubricating oil additives include extreme pressure agents, detergent dispersants, pour point depressants, viscosity index improvers, rust inhibitors, metal deactivators, antifoaming agents, and friction modifiers. It will be done.
These lubricating oil additives may be used alone or in combination of two or more.
本実施形態の潤滑油組成物は、本発明の効果を損なわない範囲で、成分（Ａ）～（Ｄ）以外の潤滑油用添加剤を含有してもよい。
当該潤滑油用添加剤としては、例えば、極圧剤、清浄分散剤、流動点降下剤、粘度指数向上剤、防錆剤、金属不活性化剤、消泡剤、及び摩擦調整剤等が挙げられる。
これらの潤滑油用添加剤は、１種を単独で用いてもよく、２種以上を組み合わせて用いてもよい。 <Additives for lubricating oil>
The lubricating oil composition of the present embodiment may contain lubricating oil additives other than components (A) to (D) to the extent that the effects of the present invention are not impaired.
Examples of such lubricating oil additives include extreme pressure agents, detergent dispersants, pour point depressants, viscosity index improvers, rust inhibitors, metal deactivators, antifoaming agents, and friction modifiers. It will be done.
These lubricating oil additives may be used alone or in combination of two or more.
［潤滑油組成物の物性］
本実施形態の潤滑油組成物は、引火点が、好ましくは２５０℃以上、より好ましくは２６０℃以上、更に好ましくは２７０℃以上、より更に好ましくは２８０℃以上である。
本明細書において、引火点は、ＪＩＳ Ｋ２２６５－４：２００７に準拠し、クリーブランド開放（ＣＯＣ）法により測定した値を意味する。 [Physical properties of lubricating oil composition]
The lubricating oil composition of the present embodiment has a flash point of preferably 250°C or higher, more preferably 260°C or higher, even more preferably 270°C or higher, even more preferably 280°C or higher.
As used herein, the flash point refers to a value measured by the Open Cleveland (COC) method in accordance with JIS K2265-4:2007.
本実施形態の潤滑油組成物は、引火点が、好ましくは２５０℃以上、より好ましくは２６０℃以上、更に好ましくは２７０℃以上、より更に好ましくは２８０℃以上である。
本明細書において、引火点は、ＪＩＳ Ｋ２２６５－４：２００７に準拠し、クリーブランド開放（ＣＯＣ）法により測定した値を意味する。 [Physical properties of lubricating oil composition]
The lubricating oil composition of the present embodiment has a flash point of preferably 250°C or higher, more preferably 260°C or higher, even more preferably 270°C or higher, even more preferably 280°C or higher.
As used herein, the flash point refers to a value measured by the Open Cleveland (COC) method in accordance with JIS K2265-4:2007.
［潤滑油組成物の製造方法］
本実施形態の潤滑油組成物の製造方法は、特に制限されない。
例えば、本実施形態の潤滑油組成物の製造方法は、潤滑油基油（Ｘ）と、ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを混合する工程を含み、
前記潤滑油基油（Ｘ）が、下記要件（１）～（４）を満たし、
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。
前記ナフチルアミン系酸化防止剤（Ｂ）と前記ジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上となるように調整し
前記リン含有フェノール系酸化防止剤（Ｃ）と前記ナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下となるように調整する工程を含む。 [Method for producing lubricating oil composition]
The method for producing the lubricating oil composition of this embodiment is not particularly limited.
For example, the method for producing a lubricating oil composition of the present embodiment includes a lubricating oil base oil (X), a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant. including the step of mixing with the agent (C),
The lubricating base oil (X) satisfies the following requirements (1) to (4),
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is adjusted to be 2.0 or more in mass ratio; A step of adjusting the content ratio [(C)/(B)] of the contained phenolic antioxidant (C) and the naphthylamine antioxidant (B) to be 0.15 or less in terms of mass ratio. include.
本実施形態の潤滑油組成物の製造方法は、特に制限されない。
例えば、本実施形態の潤滑油組成物の製造方法は、潤滑油基油（Ｘ）と、ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを混合する工程を含み、
前記潤滑油基油（Ｘ）が、下記要件（１）～（４）を満たし、
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。
前記ナフチルアミン系酸化防止剤（Ｂ）と前記ジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上となるように調整し
前記リン含有フェノール系酸化防止剤（Ｃ）と前記ナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下となるように調整する工程を含む。 [Method for producing lubricating oil composition]
The method for producing the lubricating oil composition of this embodiment is not particularly limited.
For example, the method for producing a lubricating oil composition of the present embodiment includes a lubricating oil base oil (X), a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant. including the step of mixing with the agent (C),
The lubricating base oil (X) satisfies the following requirements (1) to (4),
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is adjusted to be 2.0 or more in mass ratio; A step of adjusting the content ratio [(C)/(B)] of the contained phenolic antioxidant (C) and the naphthylamine antioxidant (B) to be 0.15 or less in terms of mass ratio. include.
当該製造方法は、必要に応じ、リン非含有フェノール系酸化防止剤（Ｄ）を配合する工程を更に含んでいてもよい。
また、当該製造方法は、必要に応じ、上述の潤滑油用添加剤を配合する工程を更に含んでいてもよい。
各成分を混合する方法としては、特に制限はないが、例えば、潤滑油基油（Ｘ）に、各成分を配合する方法が挙げられる。また、各成分は、希釈油等を加えて溶液（分散体）の形態とした上で配合してもよい。各成分を配合した後、公知の方法により、撹拌して均一に分散させることが好ましい。
なお、潤滑油基油（Ｘ）、成分（Ａ）、成分（Ｂ）、成分（Ｃ）、及び成分（Ｄ）の好ましい態様は、上述のとおりである。
また、潤滑油基油（Ｘ）、成分（Ａ）、成分（Ｂ）、成分（Ｃ）、及び成分（Ｄ）の配合量及び配合比率は、上述した潤滑油基油（Ｘ）、成分（Ａ）、成分（Ｂ）、成分（Ｃ）、及び成分（Ｄ）の好ましい含有量及び含有比率に対応する配合量及び配合比率とすることが好ましい。 The production method may further include a step of blending a phosphorus-free phenolic antioxidant (D), if necessary.
Moreover, the manufacturing method may further include a step of blending the above-mentioned lubricating oil additive, if necessary.
The method of mixing each component is not particularly limited, but for example, a method of blending each component into the lubricating base oil (X) can be mentioned. Further, each component may be mixed in the form of a solution (dispersion) by adding diluting oil or the like. After blending each component, it is preferable to stir and disperse uniformly by a known method.
In addition, preferred embodiments of the lubricating base oil (X), component (A), component (B), component (C), and component (D) are as described above.
In addition, the blending amounts and blending ratios of the lubricant base oil (X), component (A), component (B), component (C), and component (D) are as described above for the lubricant base oil (X), component ( It is preferable to set the blending amount and blending ratio corresponding to the preferred content and content ratio of A), component (B), component (C), and component (D).
また、当該製造方法は、必要に応じ、上述の潤滑油用添加剤を配合する工程を更に含んでいてもよい。
各成分を混合する方法としては、特に制限はないが、例えば、潤滑油基油（Ｘ）に、各成分を配合する方法が挙げられる。また、各成分は、希釈油等を加えて溶液（分散体）の形態とした上で配合してもよい。各成分を配合した後、公知の方法により、撹拌して均一に分散させることが好ましい。
なお、潤滑油基油（Ｘ）、成分（Ａ）、成分（Ｂ）、成分（Ｃ）、及び成分（Ｄ）の好ましい態様は、上述のとおりである。
また、潤滑油基油（Ｘ）、成分（Ａ）、成分（Ｂ）、成分（Ｃ）、及び成分（Ｄ）の配合量及び配合比率は、上述した潤滑油基油（Ｘ）、成分（Ａ）、成分（Ｂ）、成分（Ｃ）、及び成分（Ｄ）の好ましい含有量及び含有比率に対応する配合量及び配合比率とすることが好ましい。 The production method may further include a step of blending a phosphorus-free phenolic antioxidant (D), if necessary.
Moreover, the manufacturing method may further include a step of blending the above-mentioned lubricating oil additive, if necessary.
The method of mixing each component is not particularly limited, but for example, a method of blending each component into the lubricating base oil (X) can be mentioned. Further, each component may be mixed in the form of a solution (dispersion) by adding diluting oil or the like. After blending each component, it is preferable to stir and disperse uniformly by a known method.
In addition, preferred embodiments of the lubricating base oil (X), component (A), component (B), component (C), and component (D) are as described above.
In addition, the blending amounts and blending ratios of the lubricant base oil (X), component (A), component (B), component (C), and component (D) are as described above for the lubricant base oil (X), component ( It is preferable to set the blending amount and blending ratio corresponding to the preferred content and content ratio of A), component (B), component (C), and component (D).
［潤滑油組成物の用途］
本実施形態の潤滑油組成物は、好ましくは工業用設備油として用いられる。当該工業用設備油としては、好ましくは、油圧作動油；タービン油；回転式空気圧縮機油及び往復動式空気圧縮機油等の圧縮機油；工作機械油；歯車油等が挙げられ、より好ましくはタービン油；回転式空気圧縮機油及び往復動式空気圧縮機油等の圧縮機油が挙げられ、更に好ましくはタービン油が挙げられる。
したがって、本実施形態では、上記潤滑油組成物を、油圧作動油、タービン油、圧縮機油、工作機械油、又は歯車油として使用する、使用方法が提供される。また、本実施形態では、上記潤滑油組成物を、タービン油又は圧縮機油として使用する、使用方法が提供される。さらに、本実施形態では、上記潤滑油組成物を、タービン油として使用する、使用方法が提供される。 [Applications of lubricating oil composition]
The lubricating oil composition of this embodiment is preferably used as an industrial equipment oil. The industrial equipment oil preferably includes hydraulic oil; turbine oil; compressor oil such as rotary air compressor oil and reciprocating air compressor oil; machine tool oil; gear oil, etc., and more preferably turbine oil. Oil: Examples include compressor oils such as rotary air compressor oil and reciprocating air compressor oil, and more preferably turbine oil.
Therefore, this embodiment provides a method of using the lubricating oil composition as a hydraulic oil, turbine oil, compressor oil, machine tool oil, or gear oil. Moreover, in this embodiment, a method of using the above-mentioned lubricating oil composition as turbine oil or compressor oil is provided. Furthermore, the present embodiment provides a method of using the lubricating oil composition as a turbine oil.
本実施形態の潤滑油組成物は、好ましくは工業用設備油として用いられる。当該工業用設備油としては、好ましくは、油圧作動油；タービン油；回転式空気圧縮機油及び往復動式空気圧縮機油等の圧縮機油；工作機械油；歯車油等が挙げられ、より好ましくはタービン油；回転式空気圧縮機油及び往復動式空気圧縮機油等の圧縮機油が挙げられ、更に好ましくはタービン油が挙げられる。
したがって、本実施形態では、上記潤滑油組成物を、油圧作動油、タービン油、圧縮機油、工作機械油、又は歯車油として使用する、使用方法が提供される。また、本実施形態では、上記潤滑油組成物を、タービン油又は圧縮機油として使用する、使用方法が提供される。さらに、本実施形態では、上記潤滑油組成物を、タービン油として使用する、使用方法が提供される。 [Applications of lubricating oil composition]
The lubricating oil composition of this embodiment is preferably used as an industrial equipment oil. The industrial equipment oil preferably includes hydraulic oil; turbine oil; compressor oil such as rotary air compressor oil and reciprocating air compressor oil; machine tool oil; gear oil, etc., and more preferably turbine oil. Oil: Examples include compressor oils such as rotary air compressor oil and reciprocating air compressor oil, and more preferably turbine oil.
Therefore, this embodiment provides a method of using the lubricating oil composition as a hydraulic oil, turbine oil, compressor oil, machine tool oil, or gear oil. Moreover, in this embodiment, a method of using the above-mentioned lubricating oil composition as turbine oil or compressor oil is provided. Furthermore, the present embodiment provides a method of using the lubricating oil composition as a turbine oil.
［引火点向上剤］
本実施形態では、下記の潤滑油基油用の引火点向上剤も提供される。
ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを含有し、
ナフチルアミン系酸化防止剤（Ｂ）とジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上であり、
リン含有フェノール系酸化防止剤（Ｃ）とナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下である、潤滑油基油用の引火点向上剤。 [Flash point improver]
In this embodiment, the following flash point improver for lubricant base oil is also provided.
Contains a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C),
The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio,
For lubricating base oil, where the content ratio [(C)/(B)] of phosphorus-containing phenolic antioxidant (C) and naphthylamine antioxidant (B) is 0.15 or less in mass ratio flash point improver.
本実施形態では、下記の潤滑油基油用の引火点向上剤も提供される。
ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを含有し、
ナフチルアミン系酸化防止剤（Ｂ）とジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上であり、
リン含有フェノール系酸化防止剤（Ｃ）とナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下である、潤滑油基油用の引火点向上剤。 [Flash point improver]
In this embodiment, the following flash point improver for lubricant base oil is also provided.
Contains a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C),
The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio,
For lubricating base oil, where the content ratio [(C)/(B)] of phosphorus-containing phenolic antioxidant (C) and naphthylamine antioxidant (B) is 0.15 or less in mass ratio flash point improver.
上記の潤滑油基油用の引火点向上剤は、潤滑油基油の引火点をより向上させやすくする観点から、さらに、リン非含有フェノール系酸化防止剤（Ｄ）を含有することが好ましい。
The above flash point improver for lubricating base oil preferably further contains a phosphorus-free phenolic antioxidant (D) from the viewpoint of making it easier to improve the flash point of the lubricating base oil.
上記の潤滑油基油用の引火点向上剤は、特に、下記要件（１）～（４）を満たす潤滑油基油（Ｘ）の引火点を向上するために適している。
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。 The flash point improver for lubricating base oils described above is particularly suitable for improving the flash point of lubricating base oils (X) that satisfy the following requirements (1) to (4).
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。 The flash point improver for lubricating base oils described above is particularly suitable for improving the flash point of lubricating base oils (X) that satisfy the following requirements (1) to (4).
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
なお、本実施形態の潤滑油基油用の引火点向上剤において、潤滑油基油（Ｘ）、成分（Ａ）、成分（Ｂ）、成分（Ｃ）、及び成分（Ｄ）の好ましい態様は、上述のとおりである。
また、本実施形態の潤滑油基油用の引火点向上剤において、潤滑油基油（Ｘ）、成分（Ａ）、成分（Ｂ）、成分（Ｃ）、及び成分（Ｄ）の好ましい含有比率は、上述のとおりである。 In addition, in the flash point improver for lubricant base oil of this embodiment, preferred aspects of lubricant base oil (X), component (A), component (B), component (C), and component (D) are , as described above.
Further, in the flash point improver for lubricant base oil of the present embodiment, preferred content ratios of lubricant base oil (X), component (A), component (B), component (C), and component (D) is as described above.
また、本実施形態の潤滑油基油用の引火点向上剤において、潤滑油基油（Ｘ）、成分（Ａ）、成分（Ｂ）、成分（Ｃ）、及び成分（Ｄ）の好ましい含有比率は、上述のとおりである。 In addition, in the flash point improver for lubricant base oil of this embodiment, preferred aspects of lubricant base oil (X), component (A), component (B), component (C), and component (D) are , as described above.
Further, in the flash point improver for lubricant base oil of the present embodiment, preferred content ratios of lubricant base oil (X), component (A), component (B), component (C), and component (D) is as described above.
本実施形態の潤滑油基油用の引火点向上剤によれば、例えば、引火点が２３５℃以上（好ましくは２４０℃以上）の範囲にある潤滑油基油（Ｘ）の引火点を、好ましくは１０℃以上、より好ましくは１５℃以上向上させ得る。
According to the flash point improver for lubricant base oil of the present embodiment, for example, the flash point of the lubricant base oil (X) whose flash point is in the range of 235°C or higher (preferably 240°C or higher) can be improved. can be improved by 10°C or more, more preferably by 15°C or more.
［引火点向上方法］
本実施形態では、下記要件（１）～（４）を満たす潤滑油基油（Ｘ）に対し、上記の引火点向上剤を配合して、潤滑油基油（Ｘ）の引火点を向上させる、潤滑油基油の引火点向上方法が提供される。
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。 [Method for improving flash point]
In this embodiment, the flash point improver described above is blended into the lubricating base oil (X) that satisfies the following requirements (1) to (4) to improve the flash point of the lubricating base oil (X). , a method for improving the flash point of a lubricating base oil is provided.
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
本実施形態では、下記要件（１）～（４）を満たす潤滑油基油（Ｘ）に対し、上記の引火点向上剤を配合して、潤滑油基油（Ｘ）の引火点を向上させる、潤滑油基油の引火点向上方法が提供される。
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。 [Method for improving flash point]
In this embodiment, the flash point improver described above is blended into the lubricating base oil (X) that satisfies the following requirements (1) to (4) to improve the flash point of the lubricating base oil (X). , a method for improving the flash point of a lubricating base oil is provided.
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
なお、本実施形態の潤滑油基油の引火点向上方法において、潤滑油基油（Ｘ）、成分（Ａ）、成分（Ｂ）、成分（Ｃ）、及び成分（Ｄ）の好ましい態様は、上述のとおりである。
また、本実施形態の潤滑油基油の引火点向上方法において、潤滑油基油（Ｘ）、成分（Ａ）、成分（Ｂ）、成分（Ｃ）、及び成分（Ｄ）の好ましい含有比率は、上述のとおりである。 In addition, in the method for improving the flash point of a lubricating base oil of the present embodiment, preferred embodiments of the lubricating base oil (X), component (A), component (B), component (C), and component (D) are as follows: As mentioned above.
In addition, in the method for improving the flash point of lubricant base oil of the present embodiment, the preferred content ratios of lubricant base oil (X), component (A), component (B), component (C), and component (D) are , as described above.
また、本実施形態の潤滑油基油の引火点向上方法において、潤滑油基油（Ｘ）、成分（Ａ）、成分（Ｂ）、成分（Ｃ）、及び成分（Ｄ）の好ましい含有比率は、上述のとおりである。 In addition, in the method for improving the flash point of a lubricating base oil of the present embodiment, preferred embodiments of the lubricating base oil (X), component (A), component (B), component (C), and component (D) are as follows: As mentioned above.
In addition, in the method for improving the flash point of lubricant base oil of the present embodiment, the preferred content ratios of lubricant base oil (X), component (A), component (B), component (C), and component (D) are , as described above.
本実施形態の潤滑油基油の引火点向上方法によれば、例えば、引火点が２３５℃以上（好ましくは２４０℃以上）の範囲にある潤滑油基油（Ｘ）の引火点を、好ましくは１０℃以上、より好ましくは１５℃以上向上させ得る。
According to the method for improving the flash point of lubricant base oil of the present embodiment, for example, the flash point of lubricant base oil (X) having a flash point in the range of 235°C or higher (preferably 240°C or higher) is preferably It can be improved by 10°C or more, more preferably by 15°C or more.
［組成物］
また、本実施形態では、下記組成物も提供される。
ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを含有し、
ナフチルアミン系酸化防止剤（Ｂ）とジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上であり、
リン含有フェノール系酸化防止剤（Ｃ）とナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下である、組成物。
なお、本実施形態の組成物において、潤滑油基油（Ｘ）、成分（Ａ）、成分（Ｂ）、成分（Ｃ）、及び成分（Ｄ）の好ましい態様は、上述のとおりである。
また、本実施形態の組成物において、潤滑油基油（Ｘ）、成分（Ａ）、成分（Ｂ）、成分（Ｃ）、及び成分（Ｄ）の好ましい含有比率は、上述のとおりである。
なお、本実施形態では、上記組成物を使用して、潤滑油基油（Ｘ）の引火点を向上する方法も提供される。
さらに、本実施形態では、上記組成物の、潤滑油基油（Ｘ）の引火点を向上するための使用も提供される。
本実施形態の方法及び使用によれば、例えば、引火点が２３５℃以上（好ましくは２４０℃以上）の範囲にある潤滑油基油（Ｘ）の引火点を、好ましくは１０℃以上、より好ましくは１５℃以上向上させ得る。 [Composition]
Further, in this embodiment, the following composition is also provided.
Contains a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C),
The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio,
A composition in which the content ratio [(C)/(B)] of a phosphorus-containing phenolic antioxidant (C) and a naphthylamine antioxidant (B) is 0.15 or less in mass ratio.
In addition, in the composition of this embodiment, preferable aspects of the lubricating base oil (X), component (A), component (B), component (C), and component (D) are as described above.
Moreover, in the composition of this embodiment, the preferable content ratios of the lubricating base oil (X), component (A), component (B), component (C), and component (D) are as described above.
Note that this embodiment also provides a method for improving the flash point of lubricating base oil (X) using the above composition.
Furthermore, this embodiment also provides the use of the above composition for improving the flash point of a lubricating base oil (X).
According to the method and use of the present embodiment, for example, the flash point of the lubricating base oil (X) whose flash point is in the range of 235°C or higher (preferably 240°C or higher), preferably 10°C or higher, more preferably can be improved by 15°C or more.
また、本実施形態では、下記組成物も提供される。
ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを含有し、
ナフチルアミン系酸化防止剤（Ｂ）とジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上であり、
リン含有フェノール系酸化防止剤（Ｃ）とナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下である、組成物。
なお、本実施形態の組成物において、潤滑油基油（Ｘ）、成分（Ａ）、成分（Ｂ）、成分（Ｃ）、及び成分（Ｄ）の好ましい態様は、上述のとおりである。
また、本実施形態の組成物において、潤滑油基油（Ｘ）、成分（Ａ）、成分（Ｂ）、成分（Ｃ）、及び成分（Ｄ）の好ましい含有比率は、上述のとおりである。
なお、本実施形態では、上記組成物を使用して、潤滑油基油（Ｘ）の引火点を向上する方法も提供される。
さらに、本実施形態では、上記組成物の、潤滑油基油（Ｘ）の引火点を向上するための使用も提供される。
本実施形態の方法及び使用によれば、例えば、引火点が２３５℃以上（好ましくは２４０℃以上）の範囲にある潤滑油基油（Ｘ）の引火点を、好ましくは１０℃以上、より好ましくは１５℃以上向上させ得る。 [Composition]
Further, in this embodiment, the following composition is also provided.
Contains a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C),
The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio,
A composition in which the content ratio [(C)/(B)] of a phosphorus-containing phenolic antioxidant (C) and a naphthylamine antioxidant (B) is 0.15 or less in mass ratio.
In addition, in the composition of this embodiment, preferable aspects of the lubricating base oil (X), component (A), component (B), component (C), and component (D) are as described above.
Moreover, in the composition of this embodiment, the preferable content ratios of the lubricating base oil (X), component (A), component (B), component (C), and component (D) are as described above.
Note that this embodiment also provides a method for improving the flash point of lubricating base oil (X) using the above composition.
Furthermore, this embodiment also provides the use of the above composition for improving the flash point of a lubricating base oil (X).
According to the method and use of the present embodiment, for example, the flash point of the lubricating base oil (X) whose flash point is in the range of 235°C or higher (preferably 240°C or higher), preferably 10°C or higher, more preferably can be improved by 15°C or more.
［提供される本発明の一態様］
本発明の一態様では、下記［１］～［１１］が提供される。
［１］ 潤滑油基油（Ｘ）と、ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを含有し、
前記潤滑油基油（Ｘ）が、下記要件（１）～（４）を満たし、
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。
前記ナフチルアミン系酸化防止剤（Ｂ）と前記ジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上であり、
前記リン含有フェノール系酸化防止剤（Ｃ）と前記ナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下である、潤滑油組成物。
［２］ 前記ジフェニルアミン系酸化防止剤（Ａ）が、下記一般式（ａ１）で表される化合物（Ａ１）を含む、上記［１］に記載の潤滑油組成物。
［上記一般式（ａ１）中、Ｒａ１及びＲａ２は、各々独立に、炭素数１～３０のアルキル基である。ｎａ１及びｎａ２は、各々独立に、１～５の整数である。］
［３］ 前記ナフチルアミン系酸化防止剤（Ｂ）が、下記一般式（ｂ１）で表される化合物（Ｂ１）を含む、上記［１］又は［２］に記載の潤滑油組成物。
［上記一般式（ｂ１）中、Ｒｂ１は、炭素数１～３０のアルキル基である。ｎｂ１は、１～５の整数である。］
［４］ 前記リン含有フェノール系酸化防止剤（Ｃ）が、下記一般式（ｃ１）で表される化合物（Ｃ１）を含む、上記［１］～［３］のいずれかに記載の潤滑油組成物。
［上記一般式（ｃ１）中、Ｒｃ１、Ｒｃ２、Ｒｃ３、及びＲｃ４は、各々独立に、水素原子又は炭素数１～３０のアルキル基である。Ｒｃ５は、炭素数１～５のアルキレン基である。］
［５］ さらに、リン非含有フェノール系酸化防止剤（Ｄ）を含有する、上記［１］～［４］のいずれかに記載の潤滑油組成物。
［６］ 前記リン非含有フェノール系酸化防止剤（Ｄ）が、下記一般式（ｄ１）で表される化合物（Ｄ１）を含有する、上記［５］に記載の潤滑油組成物。
［上記式（ｄ１）中、Ｒｄ１は、炭素数１～５のアルキレン基である。Ｒｄ２は、炭素数１～２５のアルキル基である。］
［７］ 前記ジフェニルアミン系酸化防止剤（Ａ）、前記ナフチルアミン系酸化防止剤（Ｂ）、及び前記リン含有フェノール系酸化防止剤（Ｃ）の合計含有量が、前記潤滑油組成物の全量基準で、０．３０質量％以上である、上記［１］～［６］のいずれかに記載の潤滑油組成物。
［８］ ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを含有し、
前記ナフチルアミン系酸化防止剤（Ｂ）と前記ジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上であり、
前記リン含有フェノール系酸化防止剤（Ｃ）と前記ナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下である、潤滑油基油用の引火点向上剤。
［９］ さらに、リン非含有フェノール系酸化防止剤（Ｄ）を含有する、上記［８］に記載の潤滑油基油用の引火点向上剤。
［１０］ 前記潤滑油基油が、下記要件（１）～（４）を満たす潤滑油基油（Ｘ）であり、前記潤滑油基油（Ｘ）に使用するための、上記［８］又は［９］に記載の引火点向上剤。
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。
［１１］ 下記要件（１）～（４）を満たす潤滑油基油（Ｘ）に対し、上記［８］～［１０］のいずれかに記載の引火点向上剤を配合して、前記潤滑油基油（Ｘ）の引火点を向上させる、潤滑油基油の引火点向上方法。
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。 [One aspect of the provided invention]
In one aspect of the present invention, the following [1] to [11] are provided.
[1] Contains a lubricating base oil (X), a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C),
The lubricating base oil (X) satisfies the following requirements (1) to (4),
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio,
A lubricating oil composition in which the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0.15 or less in mass ratio. thing.
[2] The lubricating oil composition according to [1] above, wherein the diphenylamine antioxidant (A) contains a compound (A1) represented by the following general formula (a1).
[In the above general formula (a1), R a1 and R a2 are each independently an alkyl group having 1 to 30 carbon atoms. na1 and na2 are each independently an integer of 1 to 5. ]
[3] The lubricating oil composition according to [1] or [2] above, wherein the naphthylamine antioxidant (B) contains a compound (B1) represented by the following general formula (b1).
[In the above general formula (b1), R b1 is an alkyl group having 1 to 30 carbon atoms. nb1 is an integer from 1 to 5. ]
[4] The lubricating oil composition according to any one of [1] to [3] above, wherein the phosphorus-containing phenolic antioxidant (C) contains a compound (C1) represented by the following general formula (c1). thing.
[In the above general formula (c1), R c1 , R c2 , R c3 , and R c4 are each independently a hydrogen atom or an alkyl group having 1 to 30 carbon atoms. R c5 is an alkylene group having 1 to 5 carbon atoms. ]
[5] The lubricating oil composition according to any one of [1] to [4] above, further comprising a phosphorus-free phenolic antioxidant (D).
[6] The lubricating oil composition according to [5] above, wherein the phosphorus-free phenolic antioxidant (D) contains a compound (D1) represented by the following general formula (d1).
[In the above formula (d1), R d1 is an alkylene group having 1 to 5 carbon atoms. R d2 is an alkyl group having 1 to 25 carbon atoms. ]
[7] The total content of the diphenylamine antioxidant (A), the naphthylamine antioxidant (B), and the phosphorus-containing phenolic antioxidant (C) is based on the total amount of the lubricating oil composition. , 0.30% by mass or more, the lubricating oil composition according to any one of [1] to [6] above.
[8] Contains a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C),
The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio,
A lubricating oil base in which the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0.15 or less in mass ratio. Flash point improver for oil.
[9] The flash point improver for lubricating base oil according to [8] above, further comprising a phosphorus-free phenolic antioxidant (D).
[10] The lubricant base oil is a lubricant base oil (X) that satisfies the following requirements (1) to (4), and for use in the lubricant base oil (X), the above-mentioned [8] or The flash point improver according to [9].
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
[11] The lubricating oil base oil (X) that satisfies the following requirements (1) to (4) is blended with the flash point improver according to any one of the above [8] to [10], and the lubricating oil A method for improving the flash point of a lubricant base oil, which improves the flash point of a base oil (X).
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
本発明の一態様では、下記［１］～［１１］が提供される。
［１］ 潤滑油基油（Ｘ）と、ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを含有し、
前記潤滑油基油（Ｘ）が、下記要件（１）～（４）を満たし、
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。
前記ナフチルアミン系酸化防止剤（Ｂ）と前記ジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上であり、
前記リン含有フェノール系酸化防止剤（Ｃ）と前記ナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下である、潤滑油組成物。
［２］ 前記ジフェニルアミン系酸化防止剤（Ａ）が、下記一般式（ａ１）で表される化合物（Ａ１）を含む、上記［１］に記載の潤滑油組成物。
［上記一般式（ａ１）中、Ｒａ１及びＲａ２は、各々独立に、炭素数１～３０のアルキル基である。ｎａ１及びｎａ２は、各々独立に、１～５の整数である。］
［３］ 前記ナフチルアミン系酸化防止剤（Ｂ）が、下記一般式（ｂ１）で表される化合物（Ｂ１）を含む、上記［１］又は［２］に記載の潤滑油組成物。
［上記一般式（ｂ１）中、Ｒｂ１は、炭素数１～３０のアルキル基である。ｎｂ１は、１～５の整数である。］
［４］ 前記リン含有フェノール系酸化防止剤（Ｃ）が、下記一般式（ｃ１）で表される化合物（Ｃ１）を含む、上記［１］～［３］のいずれかに記載の潤滑油組成物。
［上記一般式（ｃ１）中、Ｒｃ１、Ｒｃ２、Ｒｃ３、及びＲｃ４は、各々独立に、水素原子又は炭素数１～３０のアルキル基である。Ｒｃ５は、炭素数１～５のアルキレン基である。］
［５］ さらに、リン非含有フェノール系酸化防止剤（Ｄ）を含有する、上記［１］～［４］のいずれかに記載の潤滑油組成物。
［６］ 前記リン非含有フェノール系酸化防止剤（Ｄ）が、下記一般式（ｄ１）で表される化合物（Ｄ１）を含有する、上記［５］に記載の潤滑油組成物。
［上記式（ｄ１）中、Ｒｄ１は、炭素数１～５のアルキレン基である。Ｒｄ２は、炭素数１～２５のアルキル基である。］
［７］ 前記ジフェニルアミン系酸化防止剤（Ａ）、前記ナフチルアミン系酸化防止剤（Ｂ）、及び前記リン含有フェノール系酸化防止剤（Ｃ）の合計含有量が、前記潤滑油組成物の全量基準で、０．３０質量％以上である、上記［１］～［６］のいずれかに記載の潤滑油組成物。
［８］ ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを含有し、
前記ナフチルアミン系酸化防止剤（Ｂ）と前記ジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上であり、
前記リン含有フェノール系酸化防止剤（Ｃ）と前記ナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下である、潤滑油基油用の引火点向上剤。
［９］ さらに、リン非含有フェノール系酸化防止剤（Ｄ）を含有する、上記［８］に記載の潤滑油基油用の引火点向上剤。
［１０］ 前記潤滑油基油が、下記要件（１）～（４）を満たす潤滑油基油（Ｘ）であり、前記潤滑油基油（Ｘ）に使用するための、上記［８］又は［９］に記載の引火点向上剤。
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。
［１１］ 下記要件（１）～（４）を満たす潤滑油基油（Ｘ）に対し、上記［８］～［１０］のいずれかに記載の引火点向上剤を配合して、前記潤滑油基油（Ｘ）の引火点を向上させる、潤滑油基油の引火点向上方法。
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。 [One aspect of the provided invention]
In one aspect of the present invention, the following [1] to [11] are provided.
[1] Contains a lubricating base oil (X), a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C),
The lubricating base oil (X) satisfies the following requirements (1) to (4),
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio,
A lubricating oil composition in which the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0.15 or less in mass ratio. thing.
[2] The lubricating oil composition according to [1] above, wherein the diphenylamine antioxidant (A) contains a compound (A1) represented by the following general formula (a1).
[In the above general formula (a1), R a1 and R a2 are each independently an alkyl group having 1 to 30 carbon atoms. na1 and na2 are each independently an integer of 1 to 5. ]
[3] The lubricating oil composition according to [1] or [2] above, wherein the naphthylamine antioxidant (B) contains a compound (B1) represented by the following general formula (b1).
[In the above general formula (b1), R b1 is an alkyl group having 1 to 30 carbon atoms. nb1 is an integer from 1 to 5. ]
[4] The lubricating oil composition according to any one of [1] to [3] above, wherein the phosphorus-containing phenolic antioxidant (C) contains a compound (C1) represented by the following general formula (c1). thing.
[In the above general formula (c1), R c1 , R c2 , R c3 , and R c4 are each independently a hydrogen atom or an alkyl group having 1 to 30 carbon atoms. R c5 is an alkylene group having 1 to 5 carbon atoms. ]
[5] The lubricating oil composition according to any one of [1] to [4] above, further comprising a phosphorus-free phenolic antioxidant (D).
[6] The lubricating oil composition according to [5] above, wherein the phosphorus-free phenolic antioxidant (D) contains a compound (D1) represented by the following general formula (d1).
[In the above formula (d1), R d1 is an alkylene group having 1 to 5 carbon atoms. R d2 is an alkyl group having 1 to 25 carbon atoms. ]
[7] The total content of the diphenylamine antioxidant (A), the naphthylamine antioxidant (B), and the phosphorus-containing phenolic antioxidant (C) is based on the total amount of the lubricating oil composition. , 0.30% by mass or more, the lubricating oil composition according to any one of [1] to [6] above.
[8] Contains a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C),
The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio,
A lubricating oil base in which the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0.15 or less in mass ratio. Flash point improver for oil.
[9] The flash point improver for lubricating base oil according to [8] above, further comprising a phosphorus-free phenolic antioxidant (D).
[10] The lubricant base oil is a lubricant base oil (X) that satisfies the following requirements (1) to (4), and for use in the lubricant base oil (X), the above-mentioned [8] or The flash point improver according to [9].
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
[11] The lubricating oil base oil (X) that satisfies the following requirements (1) to (4) is blended with the flash point improver according to any one of the above [8] to [10], and the lubricating oil A method for improving the flash point of a lubricant base oil, which improves the flash point of a base oil (X).
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
本発明について、以下の実施例により具体的に説明する。但し、本発明は、以下の実施例に限定されるものではない。
The present invention will be specifically explained using the following examples. However, the present invention is not limited to the following examples.
［各種物性値の測定方法］
各実施例及び各比較例で用いた基油の各性状の測定は、以下に示す要領に従って行ったものである。
（１）４０℃動粘度及び粘度指数
ＪＩＳ Ｋ２２８３：２０００に準拠して測定及び算出した。
（２）％ＣＰ
ＡＳＴＭ Ｄ３２３８：１９９５に準拠し、環分析（ｎ－ｄ－Ｍ法）により算出した。
（３）１５℃における密度
ＪＩＳ Ｋ ２２４９－１：２０１１（原油及び石油製品－密度の求め方－ 第１部：振動法）に準拠して測定した。 [Methods for measuring various physical property values]
Measurement of each property of the base oil used in each Example and each Comparative Example was performed according to the procedure shown below.
(1) 40°C kinematic viscosity and viscosity index Measured and calculated in accordance with JIS K2283:2000.
(2)% CP
Calculated by ring analysis (ndM method) in accordance with ASTM D3238:1995.
(3) Density at 15°C Measured in accordance with JIS K 2249-1:2011 (Crude oil and petroleum products - How to determine density - Part 1: Vibration method).
各実施例及び各比較例で用いた基油の各性状の測定は、以下に示す要領に従って行ったものである。
（１）４０℃動粘度及び粘度指数
ＪＩＳ Ｋ２２８３：２０００に準拠して測定及び算出した。
（２）％ＣＰ
ＡＳＴＭ Ｄ３２３８：１９９５に準拠し、環分析（ｎ－ｄ－Ｍ法）により算出した。
（３）１５℃における密度
ＪＩＳ Ｋ ２２４９－１：２０１１（原油及び石油製品－密度の求め方－ 第１部：振動法）に準拠して測定した。 [Methods for measuring various physical property values]
Measurement of each property of the base oil used in each Example and each Comparative Example was performed according to the procedure shown below.
(1) 40°C kinematic viscosity and viscosity index Measured and calculated in accordance with JIS K2283:2000.
(2)% CP
Calculated by ring analysis (ndM method) in accordance with ASTM D3238:1995.
(3) Density at 15°C Measured in accordance with JIS K 2249-1:2011 (Crude oil and petroleum products - How to determine density - Part 1: Vibration method).
［実施例１～７、比較例１～２、参考例１～３］
下記各成分を混合して表２～表４に示す組成の潤滑油組成物を調製した。
なお、表２～表４中の配合組成の数値単位は、「質量％」である。 [Examples 1-7, Comparative Examples 1-2, Reference Examples 1-3]
The following components were mixed to prepare lubricating oil compositions having the compositions shown in Tables 2 to 4.
In addition, the numerical unit of the formulation composition in Tables 2 to 4 is "mass %".
下記各成分を混合して表２～表４に示す組成の潤滑油組成物を調製した。
なお、表２～表４中の配合組成の数値単位は、「質量％」である。 [Examples 1-7, Comparative Examples 1-2, Reference Examples 1-3]
The following components were mixed to prepare lubricating oil compositions having the compositions shown in Tables 2 to 4.
In addition, the numerical unit of the formulation composition in Tables 2 to 4 is "mass %".
＜潤滑油基油（Ｘ）＞
本実施例では、ＡＰＩ（アメリカ石油協会）のグループＩＩＩに属する基油であって、表１に示す性状を有する潤滑油基油（Ｘ１）と潤滑油基油（Ｘ２）を用いた。
また、表１には、参考例２で用いた潤滑油基油（Ｘ１）と潤滑油基油（Ｘ２）との混合基油の性状も示す。
さらに、表１には、参考例３で用いた潤滑油基油（Ｘ’）の性状も示す。潤滑油基油（Ｘ’）はＡＰＩ（アメリカ石油協会）のグループＩＩに属する基油である。 <Lubricant base oil (X)>
In this example, lubricant base oil (X1) and lubricant base oil (X2), which are base oils belonging to Group III of API (American Petroleum Institute) and have the properties shown in Table 1, were used.
Table 1 also shows the properties of the mixed base oil of the lubricating base oil (X1) and the lubricating base oil (X2) used in Reference Example 2.
Furthermore, Table 1 also shows the properties of the lubricating base oil (X') used in Reference Example 3. The lubricant base oil (X') is a base oil belonging to API (American Petroleum Institute) Group II.
本実施例では、ＡＰＩ（アメリカ石油協会）のグループＩＩＩに属する基油であって、表１に示す性状を有する潤滑油基油（Ｘ１）と潤滑油基油（Ｘ２）を用いた。
また、表１には、参考例２で用いた潤滑油基油（Ｘ１）と潤滑油基油（Ｘ２）との混合基油の性状も示す。
さらに、表１には、参考例３で用いた潤滑油基油（Ｘ’）の性状も示す。潤滑油基油（Ｘ’）はＡＰＩ（アメリカ石油協会）のグループＩＩに属する基油である。 <Lubricant base oil (X)>
In this example, lubricant base oil (X1) and lubricant base oil (X2), which are base oils belonging to Group III of API (American Petroleum Institute) and have the properties shown in Table 1, were used.
Table 1 also shows the properties of the mixed base oil of the lubricating base oil (X1) and the lubricating base oil (X2) used in Reference Example 2.
Furthermore, Table 1 also shows the properties of the lubricating base oil (X') used in Reference Example 3. The lubricant base oil (X') is a base oil belonging to API (American Petroleum Institute) Group II.
＜ジフェニルアミン系酸化防止剤（Ａ）＞
ジオクチルジフェニルアミンを用いた。
ジオクチルジフェニルアミンは、一般式（ａ１）中、Ｒａ１及びＲａ２がオクチル基であり、ｎａ１＝ｎａ２＝１であり、化合物（Ａ１）に該当する。 <Diphenylamine antioxidant (A)>
Dioctyldiphenylamine was used.
In the general formula (a1), R a1 and R a2 are octyl groups, na1=na2=1, and dioctyl diphenylamine corresponds to compound (A1).
ジオクチルジフェニルアミンを用いた。
ジオクチルジフェニルアミンは、一般式（ａ１）中、Ｒａ１及びＲａ２がオクチル基であり、ｎａ１＝ｎａ２＝１であり、化合物（Ａ１）に該当する。 <Diphenylamine antioxidant (A)>
Dioctyldiphenylamine was used.
In the general formula (a1), R a1 and R a2 are octyl groups, na1=na2=1, and dioctyl diphenylamine corresponds to compound (A1).
＜ナフチルアミン系酸化防止剤（Ｂ）＞
オクチルフェニル－１－ナフチルアミンを用いた。
オクチルフェニル－１－ナフチルアミンは、一般式（ｂ１）中、Ｒｂ１がオクチル基であり、ｎｂ１＝１であり、化合物（Ｂ１）に該当する。 <Naphthylamine antioxidant (B)>
Octylphenyl-1-naphthylamine was used.
In the general formula (b1), R b1 is an octyl group and nb1=1, and octylphenyl-1-naphthylamine corresponds to compound (B1).
オクチルフェニル－１－ナフチルアミンを用いた。
オクチルフェニル－１－ナフチルアミンは、一般式（ｂ１）中、Ｒｂ１がオクチル基であり、ｎｂ１＝１であり、化合物（Ｂ１）に該当する。 <Naphthylamine antioxidant (B)>
Octylphenyl-1-naphthylamine was used.
In the general formula (b1), R b1 is an octyl group and nb1=1, and octylphenyl-1-naphthylamine corresponds to compound (B1).
＜リン含有フェノール系酸化防止剤（Ｃ）＞
３，５－ジ－ｔｅｒｔ－ブチル－４－ヒドロキシベンジルホスホン酸ジエチルを用いた。
３，５－ジ－ｔｅｒｔ－ブチル－４－ヒドロキシベンジルホスホン酸ジエチルは、一般式（ｃ１）中、Ｒｃ１及びＲｃ２がｔｅｒｔ－ブチル基であり、Ｒｃ３及びＲｃ４がエチル基であり、Ｒｃ５がメチレン基であり、化合物（Ｃ１）に該当する。 <Phosphorus-containing phenolic antioxidant (C)>
Diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate was used.
Diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate has the general formula (c1), in which R c1 and R c2 are tert-butyl groups, R c3 and R c4 are ethyl groups, R c5 is a methylene group and corresponds to compound (C1).
３，５－ジ－ｔｅｒｔ－ブチル－４－ヒドロキシベンジルホスホン酸ジエチルを用いた。
３，５－ジ－ｔｅｒｔ－ブチル－４－ヒドロキシベンジルホスホン酸ジエチルは、一般式（ｃ１）中、Ｒｃ１及びＲｃ２がｔｅｒｔ－ブチル基であり、Ｒｃ３及びＲｃ４がエチル基であり、Ｒｃ５がメチレン基であり、化合物（Ｃ１）に該当する。 <Phosphorus-containing phenolic antioxidant (C)>
Diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate was used.
Diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate has the general formula (c1), in which R c1 and R c2 are tert-butyl groups, R c3 and R c4 are ethyl groups, R c5 is a methylene group and corresponds to compound (C1).
＜リン非含有フェノール系酸化防止剤（Ｄ）＞
ベンゼンプロパン酸－３，５－ビス（１，１－ジメチルエチル）－４－ヒドロキシアルキルエステルを用いた。
ベンゼンプロパン酸－３，５－ビス（１，１－ジメチルエチル）－４－ヒドロキシアルキルエステルは、一般式（ｄ１）中、Ｒｄ１が炭素数２のアルキレン基、Ｒｄ２が炭素数８のアルキル基であり、化合物（Ｄ１）に該当する。 <Phosphorus-free phenolic antioxidant (D)>
Benzenepropanoic acid-3,5-bis(1,1-dimethylethyl)-4-hydroxyalkyl ester was used.
Benzenepropanoic acid-3,5-bis(1,1-dimethylethyl)-4-hydroxyalkyl ester has the general formula (d1), where R d1 is an alkylene group having 2 carbon atoms, and R d2 is an alkyl group having 8 carbon atoms. group, and corresponds to compound (D1).
ベンゼンプロパン酸－３，５－ビス（１，１－ジメチルエチル）－４－ヒドロキシアルキルエステルを用いた。
ベンゼンプロパン酸－３，５－ビス（１，１－ジメチルエチル）－４－ヒドロキシアルキルエステルは、一般式（ｄ１）中、Ｒｄ１が炭素数２のアルキレン基、Ｒｄ２が炭素数８のアルキル基であり、化合物（Ｄ１）に該当する。 <Phosphorus-free phenolic antioxidant (D)>
Benzenepropanoic acid-3,5-bis(1,1-dimethylethyl)-4-hydroxyalkyl ester was used.
Benzenepropanoic acid-3,5-bis(1,1-dimethylethyl)-4-hydroxyalkyl ester has the general formula (d1), where R d1 is an alkylene group having 2 carbon atoms, and R d2 is an alkyl group having 8 carbon atoms. group, and corresponds to compound (D1).
＜評価＞
試験に先立ち、参考例１～３の潤滑油基油の引火点を測定した。
本実施例において、引火点は、ＪＩＳ Ｋ２２６５－４：２００７に準拠し、クリーブランド開放（ＣＯＣ）法により測定した。
次に、実施例１～７、比較例１及び２の潤滑油組成物の引火点を、同様の方法で測定した。
そして、実施例１～３及び比較例１の潤滑油組成物については、参考例１の潤滑油基油（Ｘ）の引火点に対する引火点の上昇幅を算出した。また、実施例４～７の潤滑油組成物については、参考例２の潤滑油基油（Ｘ）の引火点に対する引火点の上昇幅を算出した。比較例２の潤滑油組成物については、参考例３の潤滑油基油（Ｘ’）の引火点に対する引火点の上昇幅を算出した。
そして、引火点の上昇幅が１０℃以上であったものを合格とした。
評価結果を表２～表４に示す。 <Evaluation>
Prior to the test, the flash points of the lubricant base oils of Reference Examples 1 to 3 were measured.
In this example, the flash point was measured by the Open Cleveland (COC) method in accordance with JIS K2265-4:2007.
Next, the flash points of the lubricating oil compositions of Examples 1 to 7 and Comparative Examples 1 and 2 were measured in the same manner.
For the lubricating oil compositions of Examples 1 to 3 and Comparative Example 1, the increase in flash point relative to the flash point of the lubricating base oil (X) of Reference Example 1 was calculated. Furthermore, for the lubricating oil compositions of Examples 4 to 7, the increase in flash point relative to the flash point of the lubricating base oil (X) of Reference Example 2 was calculated. Regarding the lubricating oil composition of Comparative Example 2, the increase in flash point relative to the flash point of the lubricating base oil (X') of Reference Example 3 was calculated.
Then, those whose flash point increased by 10° C. or more were judged to have passed.
The evaluation results are shown in Tables 2 to 4.
試験に先立ち、参考例１～３の潤滑油基油の引火点を測定した。
本実施例において、引火点は、ＪＩＳ Ｋ２２６５－４：２００７に準拠し、クリーブランド開放（ＣＯＣ）法により測定した。
次に、実施例１～７、比較例１及び２の潤滑油組成物の引火点を、同様の方法で測定した。
そして、実施例１～３及び比較例１の潤滑油組成物については、参考例１の潤滑油基油（Ｘ）の引火点に対する引火点の上昇幅を算出した。また、実施例４～７の潤滑油組成物については、参考例２の潤滑油基油（Ｘ）の引火点に対する引火点の上昇幅を算出した。比較例２の潤滑油組成物については、参考例３の潤滑油基油（Ｘ’）の引火点に対する引火点の上昇幅を算出した。
そして、引火点の上昇幅が１０℃以上であったものを合格とした。
評価結果を表２～表４に示す。 <Evaluation>
Prior to the test, the flash points of the lubricant base oils of Reference Examples 1 to 3 were measured.
In this example, the flash point was measured by the Open Cleveland (COC) method in accordance with JIS K2265-4:2007.
Next, the flash points of the lubricating oil compositions of Examples 1 to 7 and Comparative Examples 1 and 2 were measured in the same manner.
For the lubricating oil compositions of Examples 1 to 3 and Comparative Example 1, the increase in flash point relative to the flash point of the lubricating base oil (X) of Reference Example 1 was calculated. Furthermore, for the lubricating oil compositions of Examples 4 to 7, the increase in flash point relative to the flash point of the lubricating base oil (X) of Reference Example 2 was calculated. Regarding the lubricating oil composition of Comparative Example 2, the increase in flash point relative to the flash point of the lubricating base oil (X') of Reference Example 3 was calculated.
Then, those whose flash point increased by 10° C. or more were judged to have passed.
The evaluation results are shown in Tables 2 to 4.
表２から、実施例１～３の潤滑油組成物は、基準となる参考例１の潤滑油基油から引火点が１０℃以上向上していることがわかる。
これに対し、比較例１の潤滑油組成物は、ナフチルアミン系酸化防止剤（Ｂ）とジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０未満であり、リン含有フェノール系酸化防止剤（Ｃ）とナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５超であるため、基準となる参考例１の潤滑油基油から引火点が十分に向上していないことがわかる。
また、表３から、実施例４～７の潤滑油組成物は、基準となる参考例２の潤滑油基油から引火点が１０℃以上向上していることがわかる。
なお、表４から、比較例２の潤滑油組成物は、実施例７の潤滑油組成物と同様の酸化防止剤の構成としているにもかかわらず、基準となる参考例３の潤滑油基油から引火点が十分に向上していないことがわかる。このことから、要件（１）～（４）を満たさない潤滑油基油（Ｘ’）に対しては、ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）と、リン非含有フェノール系酸化防止剤（Ｄ）とを配合し、ナフチルアミン系酸化防止剤（Ｂ）とジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］を、質量比で、２．０以上に調整し、リン含有フェノール系酸化防止剤（Ｃ）とナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］を、質量比で、０．１５以下に調整しても、引火点が十分に向上しないことがわかる。 Table 2 shows that the lubricating oil compositions of Examples 1 to 3 have flash points improved by 10° C. or more from the lubricating oil base oil of Reference Example 1, which is the standard.
On the other hand, in the lubricating oil composition of Comparative Example 1, the content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) was as follows: 2.0, and the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is more than 0.15 in mass ratio. Therefore, it can be seen that the flash point has not been sufficiently improved from the lubricating base oil of Reference Example 1, which is the standard.
Furthermore, from Table 3, it can be seen that the lubricating oil compositions of Examples 4 to 7 have flash points improved by 10° C. or more from the lubricating oil base oil of Reference Example 2, which is the standard.
In addition, from Table 4, although the lubricating oil composition of Comparative Example 2 has the same antioxidant composition as the lubricating oil composition of Example 7, the lubricating oil base oil of Reference Example 3, which is the standard, It can be seen that the flash point has not been sufficiently improved. From this, for lubricant base oil (X') that does not satisfy requirements (1) to (4), diphenylamine-based antioxidant (A), naphthylamine-based antioxidant (B), and phosphorus-containing By blending the phenolic antioxidant (C) and the phosphorus-free phenolic antioxidant (D), the content ratio of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) [(B )/(A)] to a mass ratio of 2.0 or more, and the content ratio [(C)/(B) of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B). )] is adjusted to a mass ratio of 0.15 or less, it can be seen that the flash point does not improve sufficiently.
これに対し、比較例１の潤滑油組成物は、ナフチルアミン系酸化防止剤（Ｂ）とジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０未満であり、リン含有フェノール系酸化防止剤（Ｃ）とナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５超であるため、基準となる参考例１の潤滑油基油から引火点が十分に向上していないことがわかる。
また、表３から、実施例４～７の潤滑油組成物は、基準となる参考例２の潤滑油基油から引火点が１０℃以上向上していることがわかる。
なお、表４から、比較例２の潤滑油組成物は、実施例７の潤滑油組成物と同様の酸化防止剤の構成としているにもかかわらず、基準となる参考例３の潤滑油基油から引火点が十分に向上していないことがわかる。このことから、要件（１）～（４）を満たさない潤滑油基油（Ｘ’）に対しては、ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）と、リン非含有フェノール系酸化防止剤（Ｄ）とを配合し、ナフチルアミン系酸化防止剤（Ｂ）とジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］を、質量比で、２．０以上に調整し、リン含有フェノール系酸化防止剤（Ｃ）とナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］を、質量比で、０．１５以下に調整しても、引火点が十分に向上しないことがわかる。 Table 2 shows that the lubricating oil compositions of Examples 1 to 3 have flash points improved by 10° C. or more from the lubricating oil base oil of Reference Example 1, which is the standard.
On the other hand, in the lubricating oil composition of Comparative Example 1, the content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) was as follows: 2.0, and the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is more than 0.15 in mass ratio. Therefore, it can be seen that the flash point has not been sufficiently improved from the lubricating base oil of Reference Example 1, which is the standard.
Furthermore, from Table 3, it can be seen that the lubricating oil compositions of Examples 4 to 7 have flash points improved by 10° C. or more from the lubricating oil base oil of Reference Example 2, which is the standard.
In addition, from Table 4, although the lubricating oil composition of Comparative Example 2 has the same antioxidant composition as the lubricating oil composition of Example 7, the lubricating oil base oil of Reference Example 3, which is the standard, It can be seen that the flash point has not been sufficiently improved. From this, for lubricant base oil (X') that does not satisfy requirements (1) to (4), diphenylamine-based antioxidant (A), naphthylamine-based antioxidant (B), and phosphorus-containing By blending the phenolic antioxidant (C) and the phosphorus-free phenolic antioxidant (D), the content ratio of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) [(B )/(A)] to a mass ratio of 2.0 or more, and the content ratio [(C)/(B) of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B). )] is adjusted to a mass ratio of 0.15 or less, it can be seen that the flash point does not improve sufficiently.
Claims (11)
- 潤滑油基油（Ｘ）と、ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを含有し、
前記潤滑油基油（Ｘ）が、下記要件（１）～（４）を満たし、
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。
前記ナフチルアミン系酸化防止剤（Ｂ）と前記ジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上であり、
前記リン含有フェノール系酸化防止剤（Ｃ）と前記ナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下である、潤滑油組成物。 Contains a lubricating base oil (X), a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C),
The lubricating base oil (X) satisfies the following requirements (1) to (4),
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio,
A lubricating oil composition in which the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0.15 or less in mass ratio. thing. - 前記ジフェニルアミン系酸化防止剤（Ａ）が、下記一般式（ａ１）で表される化合物（Ａ１）を含む、請求項１に記載の潤滑油組成物。
［上記一般式（ａ１）中、Ｒａ１及びＲａ２は、各々独立に、炭素数１～３０のアルキル基である。ｎａ１及びｎａ２は、各々独立に、１～５の整数である。］ The lubricating oil composition according to claim 1, wherein the diphenylamine antioxidant (A) contains a compound (A1) represented by the following general formula (a1).
[In the above general formula (a1), R a1 and R a2 are each independently an alkyl group having 1 to 30 carbon atoms. na1 and na2 are each independently an integer of 1 to 5. ] - 前記ナフチルアミン系酸化防止剤（Ｂ）が、下記一般式（ｂ１）で表される化合物（Ｂ１）を含む、請求項１又は２に記載の潤滑油組成物。
［上記一般式（ｂ１）中、Ｒｂ１は、炭素数１～３０のアルキル基である。ｎｂ１は、１～５の整数である。］ The lubricating oil composition according to claim 1 or 2, wherein the naphthylamine antioxidant (B) contains a compound (B1) represented by the following general formula (b1).
[In the above general formula (b1), R b1 is an alkyl group having 1 to 30 carbon atoms. nb1 is an integer from 1 to 5. ] - 前記リン含有フェノール系酸化防止剤（Ｃ）が、下記一般式（ｃ１）で表される化合物（Ｃ１）を含む、請求項１～３のいずれか１項に記載の潤滑油組成物。
［上記一般式（ｃ１）中、Ｒｃ１、Ｒｃ２、Ｒｃ３、及びＲｃ４は、各々独立に、水素原子又は炭素数１～３０のアルキル基である。Ｒｃ５は、炭素数１～５のアルキレン基である。］ The lubricating oil composition according to any one of claims 1 to 3, wherein the phosphorus-containing phenolic antioxidant (C) contains a compound (C1) represented by the following general formula (c1).
[In the above general formula (c1), R c1 , R c2 , R c3 , and R c4 are each independently a hydrogen atom or an alkyl group having 1 to 30 carbon atoms. R c5 is an alkylene group having 1 to 5 carbon atoms. ] - さらに、リン非含有フェノール系酸化防止剤（Ｄ）を含有する、請求項１～４のいずれか１項に記載の潤滑油組成物。 The lubricating oil composition according to any one of claims 1 to 4, further comprising a phosphorus-free phenolic antioxidant (D).
- 前記リン非含有フェノール系酸化防止剤（Ｄ）が、下記一般式（ｄ１）で表される化合物（Ｄ１）を含有する、請求項５に記載の潤滑油組成物。
［上記式（ｄ１）中、Ｒｄ１は、炭素数１～５のアルキレン基である。Ｒｄ２は、炭素数１～２５のアルキル基である。］ The lubricating oil composition according to claim 5, wherein the phosphorus-free phenolic antioxidant (D) contains a compound (D1) represented by the following general formula (d1).
[In the above formula (d1), R d1 is an alkylene group having 1 to 5 carbon atoms. R d2 is an alkyl group having 1 to 25 carbon atoms. ] - 前記ジフェニルアミン系酸化防止剤（Ａ）、前記ナフチルアミン系酸化防止剤（Ｂ）、及び前記リン含有フェノール系酸化防止剤（Ｃ）の合計含有量が、前記潤滑油組成物の全量基準で、０．３０質量％以上である、請求項１～６のいずれか１項に記載の潤滑油組成物。 The total content of the diphenylamine antioxidant (A), the naphthylamine antioxidant (B), and the phosphorus-containing phenolic antioxidant (C) is 0.0% based on the total amount of the lubricating oil composition. The lubricating oil composition according to any one of claims 1 to 6, which contains 30% by mass or more.
- ジフェニルアミン系酸化防止剤（Ａ）と、ナフチルアミン系酸化防止剤（Ｂ）と、リン含有フェノール系酸化防止剤（Ｃ）とを含有し、
前記ナフチルアミン系酸化防止剤（Ｂ）と前記ジフェニルアミン系酸化防止剤（Ａ）との含有比率［（Ｂ）／（Ａ）］が、質量比で、２．０以上であり、
前記リン含有フェノール系酸化防止剤（Ｃ）と前記ナフチルアミン系酸化防止剤（Ｂ）との含有比率［（Ｃ）／（Ｂ）］が、質量比で、０．１５以下である、潤滑油基油用の引火点向上剤。 Contains a diphenylamine antioxidant (A), a naphthylamine antioxidant (B), and a phosphorus-containing phenolic antioxidant (C),
The content ratio [(B)/(A)] of the naphthylamine antioxidant (B) and the diphenylamine antioxidant (A) is 2.0 or more in mass ratio,
A lubricating oil base in which the content ratio [(C)/(B)] of the phosphorus-containing phenolic antioxidant (C) and the naphthylamine antioxidant (B) is 0.15 or less in mass ratio. Flash point improver for oil. - さらに、リン非含有フェノール系酸化防止剤（Ｄ）を含有する、請求項８に記載の潤滑油基油用の引火点向上剤。 The flash point improver for lubricating base oil according to claim 8, further comprising a phosphorus-free phenolic antioxidant (D).
- 前記潤滑油基油が、下記要件（１）～（４）を満たす潤滑油基油（Ｘ）であり、前記潤滑油基油（Ｘ）に使用するための、請求項８又は９に記載の引火点向上剤。
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。 The lubricant base oil according to claim 8 or 9, wherein the lubricant base oil is a lubricant base oil (X) satisfying the following requirements (1) to (4), and for use in the lubricant base oil (X). Flash point improver.
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more. - 下記要件（１）～（４）を満たす潤滑油基油（Ｘ）に対し、請求項８～１０のいずれか１項に記載の引火点向上剤を配合して、前記潤滑油基油（Ｘ）の引火点を向上させる、潤滑油基油の引火点向上方法。
・要件（１）：粘度指数が１２０以上である。
・要件（２）：環分析（ｎ－ｄ－Ｍ法）による％ＣＰが８５以上である。
・要件（３）：１５℃における密度が０．８３５ｇ／ｃｍ３以下である。
・要件（４）：４０℃における動粘度が、２８．８ｍｍ２／ｓ以上である。 The flash point improver according to any one of claims 8 to 10 is blended with the lubricant base oil (X) that satisfies the following requirements (1) to (4) to obtain the lubricant base oil (X). ) A method for improving the flash point of lubricant base oil.
- Requirement (1): Viscosity index is 120 or more.
- Requirement (2): % CP by ring analysis (ndM method) is 85 or more.
- Requirement (3): Density at 15°C is 0.835 g/cm 3 or less.
- Requirement (4): Kinematic viscosity at 40°C is 28.8 mm 2 /s or more.
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