WO2023054056A1 - 潤滑油基油 - Google Patents

潤滑油基油 Download PDF

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Publication number
WO2023054056A1
WO2023054056A1 PCT/JP2022/034964 JP2022034964W WO2023054056A1 WO 2023054056 A1 WO2023054056 A1 WO 2023054056A1 JP 2022034964 W JP2022034964 W JP 2022034964W WO 2023054056 A1 WO2023054056 A1 WO 2023054056A1
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Prior art keywords
lubricating
base oil
group
less
component
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/034964
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English (en)
French (fr)
Japanese (ja)
Inventor
和茂 松原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Idemitsu Kosan Co Ltd
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Idemitsu Kosan Co Ltd
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Priority to US18/690,793 priority Critical patent/US20250002802A1/en
Priority to CN202280036793.5A priority patent/CN117355595A/zh
Publication of WO2023054056A1 publication Critical patent/WO2023054056A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • 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
    • C10M111/00—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential
    • C10M111/04—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential at least one of them being a macromolecular organic compound
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
    • C10M101/02—Petroleum fractions
    • 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
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32—Esters
    • C10M105/36—Esters of polycarboxylic acids
    • 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
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/02—Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation
    • 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
    • C10M111/00—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential
    • C10M111/02—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential at least one of them being a non-macromolecular organic compound
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • 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
    • C10M133/16—Amides; Imides
    • 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
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/102—Aliphatic fractions
    • C10M2203/1025—Aliphatic fractions used as base material
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/0206—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers used as base material
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
    • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/282—Esters of (cyclo)aliphatic oolycarboxylic acids
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/282—Esters of (cyclo)aliphatic oolycarboxylic acids
    • C10M2207/2825—Esters of (cyclo)aliphatic oolycarboxylic acids used as base material
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/283—Esters of polyhydroxy compounds
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/34—Esters having a hydrocarbon substituent of thirty or more carbon atoms, e.g. substituted succinic acid derivatives
    • C10M2207/345—Esters having a hydrocarbon substituent of thirty or more carbon atoms, e.g. substituted succinic acid derivatives used as base material
    • 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
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
    • C10M2209/084—Acrylate; Methacrylate
    • 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
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
    • C10M2215/08—Amides [having hydrocarbon substituents containing less than thirty carbon atoms]
    • 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
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
    • C10M2215/24—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions having hydrocarbon substituents containing thirty or more carbon atoms, e.g. nitrogen derivatives of substituted succinic acid
    • C10M2215/28—Amides; Imides
    • 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
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/046—Overbased sulfonic acid salts
    • 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
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/10—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring
    • C10M2219/104—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring containing sulfur and carbon with nitrogen or oxygen in the ring
    • C10M2219/106—Thiadiazoles
    • 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
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/049—Phosphite
    • 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
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/02—Unspecified siloxanes; Silicones
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/02—Viscosity; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/02—Pour-point; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/36—Seal compatibility, e.g. with rubber
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/14—Electric or magnetic purposes
    • C10N2040/16—Dielectric; Insulating oil or insulators

Definitions

  • the present invention relates to a lubricating base oil and a lubricating oil composition containing the lubricating base oil.
  • Lubricating oil compositions are used in these mechanisms, and lubricating oil compositions that can meet various demands have been developed.
  • Patent Literature 1 describes an automotive transmission oil composition suitably used in an electric motor-equipped vehicle comprising a base oil, a hydrocarbon group-containing zinc dithiophosphate, a triaryl phosphate, a triaryl thiophosphate, and a mixture thereof. and a phosphorus compound selected from the group consisting of a predetermined amount and adjusted to have a volume resistivity of 1 ⁇ 10 7 ⁇ m or more at 80° C. is disclosed.
  • lubricating oil compositions used in various devices are sometimes required to have properties such as friction reduction effect and rubber swelling resistance, depending on the mode of the device, in addition to insulating properties.
  • properties such as friction reduction effect and rubber swelling resistance, depending on the mode of the device, in addition to insulating properties.
  • a new lubricating oil composition having properties suitable for lubricating various mechanisms incorporated in devices (for example, insulating properties, friction reducing effects, rubber swelling resistance, etc.).
  • the present invention is a lubricating oil containing at least one ester compound selected from diesters and triesters having a predetermined number of carbon atoms and at least one base oil (B) selected from mineral oils and synthetic oils other than ester-based synthetic oils.
  • a base oil and a lubricating oil composition comprising the lubricating base oil are provided.
  • the present invention provides the following [1] to [12]. [1] at least one ester compound (A) selected from diesters (A1) having 24 or more carbon atoms and triesters (A2) having 24 or more carbon atoms;
  • a lubricating base oil comprising at least one base oil (B) selected from a mineral oil (B1) and a synthetic oil (B2) other than an ester synthetic oil.
  • R 1 and R 2 are each independently a monovalent chain hydrocarbon group, and A 1 is a divalent hydrocarbon group having 5 or more carbon atoms.
  • component (A2) contains a compound (A21) represented by the following general formula (a2-1).
  • R 3 , R 4 and R 5 are each independently a monovalent chain hydrocarbon group, and A 2 is a trivalent hydrocarbon group having 5 or more carbon atoms.
  • component (A) contains at least component (A1).
  • a lubricating oil composition comprising the lubricating base oil according to any one of [1] to [8] above.
  • pour point depressants pour point depressants, viscosity index improvers, antioxidants, extreme pressure agents, metallic detergents, ashless dispersants, metal deactivators, corrosion inhibitors, rust inhibitors, and antiseptics
  • the lubricating base oil of one preferred aspect of the present invention can be used to prepare a lubricating oil composition having properties suitable for various mechanisms incorporated in equipment. It is possible to prepare a lubricating oil composition having well-balanced improved properties, friction reducing effect, and rubber swelling resistance.
  • the upper and lower limits can be combined arbitrarily.
  • the numerical range is described as “preferably 30 to 100, more preferably 40 to 80”
  • the range of "30 to 80” and the range of "40 to 100” are also described in this specification. included in the specified numerical range.
  • the numerical range is described as “preferably 30 or more, more preferably 40 or more, and preferably 100 or less, more preferably 80 or less”
  • “30 to 80” Ranges and ranges from “40 to 100” are also included in the numerical ranges described herein.
  • “60 to 100” means a range of "60 or more and 100 or less”.
  • kinematic viscosity and viscosity index mean values measured or calculated in accordance with JIS K2283:2000.
  • the lubricating base oil of one embodiment of the present invention comprises at least one ester compound (A) selected from diesters (A1) having 24 or more carbon atoms and triesters (A2) having 24 or more carbon atoms, and mineral oil (B1) and at least one base oil (B) selected from synthetic oils (B2) other than ester-based synthetic oils.
  • ester compound (A) selected from diesters (A1) having 24 or more carbon atoms and triesters (A2) having 24 or more carbon atoms
  • mineral oil (B1) and at least one base oil (B) selected from synthetic oils (B2) other than ester-based synthetic oils.
  • a lubricating oil composition used in a device in which a transmission and an electric motor are integrated is required to have properties such as insulating properties as an electric motor oil, a friction reduction effect as a transmission, and rubber swelling resistance. .
  • general transmission oil has a problem of poor insulation.
  • a lubricating oil composition containing an ester synthetic oil as a base oil may have good insulating properties, but generally has a problem of poor rubber swelling resistance. Moreover, in many cases, the friction reduction effect is insufficient.
  • the lubricating base oil of one embodiment of the present invention contains the ester compound (A) and the base oil (B) to provide insulation, friction reduction effect, and rubber swelling resistance. It is possible to prepare a lubricating oil base oil that can prepare a lubricating oil composition in which the properties of are improved in a well-balanced manner.
  • the lubricating base oil of one embodiment of the present invention may contain base oils other than components (A) and (B) within a range that does not impair the effects of the present invention.
  • Such other base oils include, for example, ester-based synthetic oils that do not correspond to component (A). Specifically, monoesters, diesters having 23 or less carbon atoms, and triesters having 23 or less carbon atoms. , a polyester having 4 or more ester bonds, and the like.
  • the total content of (A) and (B) is based on the total amount (100% by mass) of the lubricating base oil, preferably 92 to 100% by mass, more preferably 95 to 100% by mass, more preferably 97 to 100% by mass, more preferably 99 to 100% by mass, particularly preferably 100% by mass.
  • Components (A) and (B) contained in the lubricating base oil of one embodiment of the present invention are described in detail below.
  • the lubricating base oil of one embodiment of the present invention contains at least one ester compound (A) selected from diesters (A1) having 24 or more carbon atoms and triesters (A2) having 24 or more carbon atoms.
  • ester compound (A) selected from diesters (A1) having 24 or more carbon atoms and triesters (A2) having 24 or more carbon atoms.
  • the content of the component (A) is based on the total amount (100% by mass) of the lubricating base oil, and the lubricating oil composition with improved insulation and friction reduction effect.
  • lubricating base oil that can be prepared, preferably 1% by mass or more, more preferably 3% by mass or more, more preferably 5% by mass or more, more preferably 7% by mass or more, still more preferably 10% by mass above, more preferably 12% by mass or more, still more preferably 15% by mass or more, even more preferably 17% by mass or more, particularly preferably 20% by mass or more, and ensuring the content of component (B)
  • it is preferably 90% by mass or less, more preferably 80% by mass or less, more preferably 70% by mass or less, and more It is preferably 60% by mass or less, more preferably 55% by mass
  • the component (A) used in one aspect of the present invention may be configured to contain at least one component (A1), or may be configured to contain at least one component (A2). It may be a configuration containing a combination of one component (A1) and at least one component (A2).
  • the content ratio of the component (A1) and the component (A2) [(A1)/(A2) ] is a mass ratio of 1/99 or more, 5/95 or more, 10/90 or more, 15/85 or more, 20/80 or more, 25/75 or more, 30/70 or more, 35/65 or more, 40/60 99/1 or less, 95/5 or less, 90/10 or less, 85/15 or less, 80/20 or less, 75/25 or less, 70/30 or less, 65/ It may be 35 or less, or 60/40 or less.
  • the number of carbon atoms in component (A1) is 24 or more from the viewpoint of making it a lubricating base oil capable of preparing a lubricating oil composition that improves insulating properties and friction-reducing effects and suppresses deterioration in rubber swelling resistance. , preferably 26 or more, more preferably 27 or more, further preferably 28 or more, and 80 or less, 75 or less, 70 or less, 65 or less, 60 or less, 55 or less, 50 or less, 45 or less, 40 or less, 37 or less, or 35 or less.
  • the number of carbon atoms in the component (A2) is 24 or more from the viewpoint of making it a lubricating base oil capable of preparing a lubricating oil composition that improves the insulating properties and the friction reducing effect and suppresses the deterioration of rubber swelling resistance.
  • a lubricating base oil capable of preparing a lubricating oil composition that improves the insulating properties and the friction reducing effect and suppresses the deterioration of rubber swelling resistance.
  • It is preferably 60 or more, and may be 100 or less, 95 or less, 90 or less, 85 or less, 80 or less, 75 or less, or 70 or less.
  • the component (A1) used in one aspect of the present invention preferably contains a compound (A11) represented by the following general formula (a1-1).
  • R 1 and R 2 are each independently a monovalent chain hydrocarbon group, and A 1 is a divalent hydrocarbon group having 5 or more carbon atoms. be.
  • the monovalent chain hydrocarbon group that can be selected as R 1 and R 2 is preferably an alkyl group or an alkenyl group.
  • alkyl group include methyl group, ethyl group, propyl group (n-propyl group, isopropyl group), butyl group (n-butyl group, s-butyl group, t-butyl group, isobutyl group), and pentyl group.
  • alkenyl group examples include ethenyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, methylheptenyl, nonyl, methyloctenyl, decenyl, methylnonyl, and undecenyl groups.
  • Each carbon number of the monovalent chain hydrocarbon group that can be selected as R 1 and R 2 improves insulation and friction reduction effect, and prepares a lubricating oil composition that suppresses deterioration of rubber swelling resistance.
  • a lubricating base oil that can be It is more preferably 25 or less, still more preferably 20 or less, even more preferably 16 or less, and particularly preferably 12 or less.
  • Examples of the divalent hydrocarbon group that can be selected as A 1 include an alkylene group, an alkenylene group, a cycloalkylene group, a cycloalkenylene group, an arylene group, and a divalent group obtained by combining these groups. mentioned.
  • the divalent group may be a combination of the above groups having 1 or more carbon atoms and the total number of carbon atoms should be 5 or more.
  • the alkylene group may be a linear alkylene group or a branched alkylene group. Specific examples include groups (i) to (iii) below. (i): a group represented by -(CH 2 ) n - (where n is an integer of 1 or more).
  • the alkenylene group may be a straight-chain alkenylene group or a branched-chain alkenylene group.
  • Examples of the cycloalkylene group include a cyclopentylene group, a cyclohexylene group, a cyclopentylene group, a cyclooctylene group and the like.
  • Examples of the cycloalkenylene group include a cyclopentenylene group, a cyclohexenylene group, a cyclopentenylene group, a cyclooctenylene group, and the like.
  • Examples of the arylene group include phenylene group, naphthylene group and anthracenylene group.
  • the divalent divalent that can be selected as A 1 from the viewpoint of making it a lubricating base oil that can prepare a lubricating oil composition that improves insulation and friction reduction effects and suppresses deterioration of rubber swelling resistance.
  • the hydrocarbon group of is preferably an alkylene group or an alkenylene group, more preferably an alkylene group, and in particular, a lubricating oil base oil that can prepare a lubricating oil composition that further suppresses the deterioration of rubber swelling resistance.
  • n is 5 or more (preferably 6 or more, more preferably 7 or more, still more preferably 8 or more, still more preferably 9 or more, especially is preferably an integer of 10 or more) is more preferable.
  • the number of carbon atoms in the divalent hydrocarbon group that can be selected as A 1 is a lubricating base oil that can prepare a lubricating oil composition that improves insulation and friction reducing effects and suppresses deterioration of rubber swelling resistance. From the viewpoint of, it is 5 or more, preferably 6 or more, more preferably 7 or more, more preferably 8 or more, still more preferably 9 or more, particularly preferably 10 or more, and preferably 30 or less, It is more preferably 24 or less, still more preferably 20 or less, still more preferably 16 or more, and particularly preferably 14 or less.
  • the content of the compound (A11) in the component (A1) is preferably based on the total amount (100% by mass) of the component (A1) contained in the lubricating base oil. is 70 to 100% by mass, more preferably 80 to 100% by mass, still more preferably 90 to 100% by mass, even more preferably 95 to 100% by mass, and particularly preferably 98 to 100% by mass.
  • the component (A2) used in one aspect of the present invention preferably contains a compound (A21) represented by general formula (a2-1) below.
  • A21 represented by general formula (a2-1) below.
  • R 3 , R 4 and R 5 are each independently a monovalent chain hydrocarbon group, and A 2 is a trivalent hydrocarbon group having 5 or more carbon atoms. It is a hydrogen group.
  • the monovalent chain hydrocarbon group that can be selected as R 3 , R 4 and R 5 is preferably an alkyl group or an alkenyl group, and is selected as R 1 and R 2 in the general formula (a1-1). The same as the alkyl group or alkenyl group to be obtained can be mentioned.
  • Each carbon number of the monovalent chain hydrocarbon group which can be selected as R 3 , R 4 and R 5 , improves insulation and friction reduction effect, and suppresses deterioration of rubber swelling resistance lubricating oil composition from the viewpoint of lubricating base oil that can be used to prepare a product, preferably 3 or more, more preferably 5 or more, more preferably 7 or more, still more preferably 9 or more, even more preferably 11 or more, particularly preferably 13 or more It is preferably 40 or less, more preferably 35 or less, even more preferably 30 or less, even more preferably 25 or less, and particularly preferably 22 or less.
  • the trivalent hydrocarbon group that can be selected as A 2 for example, the divalent hydrocarbon group that can be selected as A 1 in the above general formula (a1-1) further includes one hydrogen atom
  • a trivalent group formed by removal and the like can be mentioned.
  • a group represented by the following general formula (a2-1-1) is preferable.
  • x1, x2, and x3 are each independently an integer of 0 or more, preferably an integer of 0 to 15, more preferably an integer of 0 to 10, more preferably an integer of 0 to 8, still more preferably 1 It is an integer from 1 to 6, more preferably an integer from 1 to 4, still more preferably an integer from 1 to 3, and particularly preferably an integer from 1 to 2.
  • R 7 is an alkyl group, and includes the same alkyl groups that can be selected as R 1 and R 2 in general formula (a1-1). The number of carbon atoms in the alkyl group that can be selected as R 7 is preferably 1 to 15, more preferably 1 to 10, more preferably 1 to 8, still more preferably 1 to 6, even more preferably 1 to 4, 2 to 3 are particularly preferred.
  • the content of the compound (A21) in the component (A2) is preferably based on the total amount (100% by mass) of the component (A2) contained in the lubricating base oil. is 70 to 100% by mass, more preferably 80 to 100% by mass, still more preferably 90 to 100% by mass, even more preferably 95 to 100% by mass, and particularly preferably 98 to 100% by mass.
  • the lubricating base oil of one aspect of the present invention contains at least one base oil (B) selected from mineral oils (B1) and synthetic oils (B2) other than ester-based synthetic oils.
  • B base oil
  • the component (B) together with the component (A) that causes a decrease in rubber swelling resistance, the friction reducing effect of the component (A) is maintained, and the components (A) and (B) are combined to provide insulation.
  • It can be used as a lubricating oil base oil that can prepare a lubricating oil composition that has improved properties and suppresses the deterioration of rubber swelling resistance caused by the component (A).
  • the content of the component (B) is based on the total amount (100% by mass) of the lubricating base oil.
  • Lubricating oil composition excellent in insulation and rubber swelling resistance From the viewpoint of lubricating base oil that can be prepared, preferably 10% by mass or more, more preferably 20% by mass or more, more preferably 30% by mass or more, more preferably 40% by mass or more, still more preferably 45% by mass above, more preferably 50% by mass or more, still more preferably 55% by mass or more, even more preferably 60% by mass or more, particularly preferably 65% by mass or more, and ensuring the content of component (A), From the viewpoint of making a lubricating base oil that can prepare a lubricating oil composition with improved friction-reducing effect, it is preferably 99% by mass or less, more preferably 97% by mass or less, more preferably 95% by mass or less, more preferably 93% by mass. % by mass or less, more preferably 90% by mass or less, more
  • the mineral oil (B1) used in one aspect of the present invention includes, for example, atmospheric residual oil obtained by atmospheric distillation of crude oil such as paraffinic crude oil, intermediate crude oil, and naphthenic crude oil; Distillate obtained by distillation under reduced pressure; the distillate is subjected to refining treatments such as solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, and hydrorefining (hydrocracking) Refined oil obtained by applying one or more;
  • crude oil such as paraffinic crude oil, intermediate crude oil, and naphthenic crude oil
  • Distillate obtained by distillation under reduced pressure the distillate is subjected to refining treatments such as solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, and hydrorefining (hydrocracking) Refined oil obtained by applying one or more;
  • synthetic oil (B2) other than the ester-based synthetic oil used in one aspect of the present invention for example, an ⁇ -olefin homopolymer or an ⁇ -olefin copolymer (for example, an ethylene- ⁇ -olefin copolymer, etc.)
  • Poly ⁇ -olefins such as ⁇ -olefin copolymers having 8 to 14 carbon atoms); isoparaffins; polyalkylene glycols; ether-based oils such as polyphenyl ethers; alkylbenzenes; alkylnaphthalenes; Synthetic oil (GTL) obtained by isomerizing a wax (GTL wax (Gas To Liquids WAX)) obtained by isomerizing.
  • the component (B) used in one aspect of the present invention preferably contains at least one selected from mineral oils classified into Groups 2 and 3 of the API (American Petroleum Institute) base oil category, and synthetic oils.
  • the 100° C. kinematic viscosity of the lubricating base oil of one embodiment of the present invention is 1.0 mm 2 /s or more, 1.2 mm 2 /s or more, 1.5 mm 2 /s or more, 1.7 mm 2 /s or more, 2 0 mm 2 /s or more, 2.2 mm 2 /s or more, or 2.5 mm 2 /s or more, or 10 mm 2 /s or less, 9.0 mm 2 /s or less, 8.0 mm 2 /s or less , 7.0 mm 2 /s or less, 6.0 mm 2 /s or less, 5.0 mm 2 /s or less, 4.5 mm 2 /s or less, 4.2 mm 2 /s or less, 4.0 mm 2 /s or less, 3 0.8 mm 2 /s or less, or 3.5 mm 2 /s or less.
  • the viscosity index of the lubricating base oil of one embodiment of the present invention may be 70 or more, 80 or more, 85 or more, 90 or more, 95 or more, 100 or more, 105 or more, 110 or more, or 115 or more.
  • the 15° C. density of the lubricating base oil of one aspect of the present invention is preferably less than 0.850 g/cm 3 , more preferably 0.848 g/cm 3 or less, even more preferably 0.847 g/cm 3 or less, and even more It is preferably 0.846 g/cm 3 or less, and further 0.845 g/cm 3 or less, 0.844 g/cm 3 or less, 0.843 g/cm 3 or less, 0.842 g/cm 3 or less, or 0.841 g /cm 3 or less, 0.600 g/cm 3 or more, 0.650 g/cm 3 or more, 0.700 g/cm 3 or more, 0.750 g/cm 3 or more, 0.800 g/cm 3 or more, It may be 0.810 g/cm 3 or more, 0.820 g/cm 3 or more, or 0.825 g/cm 3 or more.
  • a lubricating oil composition of one aspect of the present invention contains the lubricating base oil of one aspect of the present invention described above.
  • the lubricating oil composition of one aspect of the present invention may further contain lubricating oil additives, specifically, pour point depressants, viscosity index improvers, antioxidants, extreme pressure agents, metallic It may contain one or more lubricating oil additives selected from detergents, ashless dispersants, metal deactivators, corrosion inhibitors, rust inhibitors, and defoamers. Each of these lubricating oil additives may be used alone, or two or more of them may be used in combination.
  • each of these lubricating oil additives can be adjusted as appropriate within a range that does not impair the effects of the present invention. It is usually 0.001 to 15% by mass, preferably 0.005 to 10% by mass, more preferably 0.01 to 5% by mass, independently for each agent.
  • the content of the lubricating base oil of one aspect of the present invention is preferably 50% by mass or more based on the total amount (100% by mass) of the lubricating oil composition. , more preferably 60% by mass or more, still more preferably 70% by mass or more, still more preferably 80% by mass or more, and particularly preferably 90% by mass or more.
  • Pour point depressants used in one embodiment of the present invention include, for example, ethylene-vinyl acetate copolymers, condensates of chlorinated paraffin and naphthalene, condensates of chlorinated paraffin and phenol, polymethacrylates, and polyalkylstyrenes. etc. These pour point depressants may be used alone or in combination of two or more.
  • Viscosity index improvers used in one embodiment of the present invention include, for example, non-dispersing polymethacrylates, dispersing polymethacrylates, olefinic copolymers (e.g., ethylene-propylene copolymers), dispersing olefinic copolymers, Polymers such as coalescence, styrenic copolymers (eg, styrene-diene copolymers, styrene-isoprene copolymers, etc.) can be mentioned. These viscosity index improvers may be used alone or in combination of two or more.
  • the weight average molecular weight (Mw) of the viscosity index improver used in one aspect of the present invention may be 5,000 or more, 7,000 or more, 10,000 or more, 15,000 or more, or 20,000 or more. , or 1,000,000 or less, 700,000 or less, 500,000 or less, 300,000 or less, 200,000 or less, 100,000 or less, or 50,000 or less.
  • Antioxidants used in one aspect of the present invention include, for example, alkylated diphenylamine, phenylnaphthylamine, alkylated phenylnaphthylamine, and other amine-based antioxidants; (2,6-di-t-butylphenol), isooctyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, n-octadecyl-3-(3,5-di-t-butyl-4 - phenolic antioxidants such as hydroxyphenyl)propionate; These antioxidants may be used alone or in combination of two or more. In the lubricating oil composition of one aspect of the present invention, it is preferable that the antioxidant is a combination of an amine-based antioxidant and a phenol-based antioxidant.
  • Examples of extreme pressure agents (antiwear agents) used in one embodiment of the present invention include sulfur-containing compounds such as zinc dithiophosphate; phosphites, phosphates, phosphonates, and amine salts thereof. or phosphorus-containing compounds such as metal salts; sulfur- and phosphorus-containing compounds such as thiophosphites, thiophosphates, thiophosphonates, and their amine salts or metal salts. , may be used alone, or two or more thereof may be used in combination.
  • Metallic detergents for use in one aspect of the present invention include metal salts such as metal sulfonates, metal salicylates, and metal phenates.
  • the metal atom constituting the metal salt is preferably a metal atom selected from alkali metals and alkaline earth metals, more preferably sodium, calcium, magnesium, or barium, and still more preferably calcium. These metallic detergents may be used alone or in combination of two or more.
  • the metallic detergent preferably contains one or more selected from calcium sulfonate, calcium salicylate, and calcium phenate, more preferably calcium sulfonate.
  • the content of calcium sulfonate is preferably 50 to 100% by mass, more preferably 60 to 100% by mass, and still more preferably 70% by mass, based on the total amount (100% by mass) of the metallic detergent contained in the lubricating oil composition. ⁇ 100% by mass, more preferably 80 to 100% by mass.
  • the base number of the metallic detergent is preferably 0 to 600 mgKOH/g.
  • the metallic detergent is preferably an overbased metallic detergent having a base value of 100 mgKOH/g or more.
  • the base number of the overbased metallic detergent is 100 mgKOH/g or more, preferably 150 to 500 mgKOH/g, more preferably 200 to 450 mgKOH/g.
  • base number refers to 7. of JIS K2501:2003 “Petroleum products and lubricating oils—neutralization value test method”. Means the base number by the perchloric acid method measured in accordance with.
  • Examples of the ashless dispersant used in one aspect of the present invention include boron-free succinimides such as boron-free alkenyl succinimide, boron-containing succinimides such as boron-containing alkenyl succinimide, benzyl Examples include amines, boron-containing benzylamines, succinic acid esters, fatty acids, and monovalent or divalent carboxylic acid amides represented by succinic acid. These ashless dispersants may be used alone or in combination of two or more.
  • Metal deactivators used in one embodiment of the present invention include benzotriazole-based compounds, tolyltriazole-based compounds, imidazole-based compounds, thiadiazole-based compounds, and pyrimidine-based compounds. These metal deactivators may be used alone or in combination of two or more.
  • ⁇ Corrosion inhibitor> examples of the corrosion inhibitor used in one aspect of the present invention include amine-based compounds, alkanolamine-based compounds, amide-based compounds, and carboxylic acid-based compounds. These corrosion inhibitors may be used alone or in combination of two or more.
  • Antifoaming agents used in one aspect of the present invention include, for example, silicone oils, fluorosilicone oils, fluoroalkyl ethers, and the like. These antifoaming agents may be used alone or in combination of two or more.
  • the lubricating oil composition of one aspect of the present invention uses the lubricating base oil containing the components (A) and (B), it has an excellent friction-reducing effect and does not need to contain an aliphatic amide. .
  • the aliphatic amide is a factor that lowers the insulating properties of the lubricating oil composition, its content is preferably as low as possible, and it is more preferably substantially absent.
  • the content of the aliphatic amide is preferably less than 1.0% by mass, more preferably 0.5% by mass, based on the total amount (100% by mass) of the lubricating oil composition. It is less than mass %, more preferably less than 0.1 mass %.
  • the phrase "substantially free of aliphatic amides” is a rule that excludes embodiments in which aliphatic amides are contained based on a specific purpose, and aliphatic amides are unavoidable as impurities in other components. It does not exclude even the aspect in which it is contained unintentionally.
  • the content of aliphatic amide is based on the total amount (100% by mass) of the lubricating oil composition, more preferably less than 0.01% by mass , more preferably less than 0.001% by mass, even more preferably less than 0.0001% by mass, particularly preferably less than 0.00001% by mass.
  • Aliphatic amides include, for example, reaction products of aliphatic carboxylic acids and aliphatic amines.
  • aliphatic carboxylic acids include palmitic acid, isopalmitic acid, stearic acid, isostearic acid, behenic acid, lignoceric acid, cetironic acid, heptacosanoic acid, montanic acid, melissic acid, laxelic acid, cetenoic acid, erucic acid, and the like. mentioned.
  • Examples of aliphatic amines include ammonia, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and pentaethylenehexamine.
  • the 100° C. kinematic viscosity of the lubricating oil composition of one embodiment of the present invention is appropriately adjusted depending on the application, and is 1.0 mm 2 /s or more, 1.5 mm 2 /s or more, 2.0 mm 2 /s or more, 2 2 mm 2 /s or more, 2.5 mm 2 /s or more, 2.7 mm 2 /s or more, or 3.0 mm 2 /s or more, or 10 mm 2 / s or less, 9.0 mm 2 /s or less , 8.0 mm 2 /s or less, 7.0 mm 2 /s or less, 6.0 mm 2 /s or less, 5.0 mm 2 /s or less, 4.5 mm 2 /s or less, 4.2 mm 2 /s or less, 4 0 mm 2 /s or less, 3.8 mm 2 /s or less, or 3.5 mm 2 /s or less.
  • the viscosity index of the lubricating oil composition of one aspect of the present invention is 70 or more, 80 or more, 85 or more, 90 or more, 95 or more, 100 or more, 105 or more, 110 or more, 115 or more, 120 or more, 125 or more, or 130 It is good as above.
  • the volume resistivity measured in accordance with JIS C2101 under conditions of a measurement temperature of 80° C., an applied voltage of 250 V, and a measurement time of 1 minute is preferably 1.4 ⁇ 10. more than 7 ⁇ m, more preferably 1.5 ⁇ 10 7 ⁇ m or more, still more preferably 1.6 ⁇ 10 7 ⁇ m or more, still more preferably 1.7 ⁇ 10 7 ⁇ m or more .
  • the value of volume resistivity means the value measured by the method described in Examples below.
  • the lubricating oil composition of one aspect of the present invention has a metal-to-metal friction coefficient measured in accordance with the method of Examples described later, preferably less than 0.160, more preferably 0.158 or less, still more preferably 0 0.157 or less, more preferably 0.155 or less, and particularly preferably 0.153 or less.
  • a test nitrile rubber was immersed in the lubricating oil composition of one embodiment of the present invention by a rubber immersion test method in accordance with JIS K6258, and measured at 100 ° C. for 144 hours.
  • the volume change rate is preferably 10% or less, more preferably 8% or less, even more preferably 7% or less, even more preferably 5% or less, and particularly preferably 4% or less.
  • the volume change rate of the test nitrile rubber means the value measured by the method described in Examples below.
  • a lubricating oil composition of a preferred embodiment of the present invention has properties suitable for various mechanisms incorporated in devices, and is excellent in insulating properties, friction reducing effect, and rubber swelling resistance.
  • the lubricating oil composition of one embodiment of the present invention is incorporated in various devices such as electric drive units, engines, transmissions, reduction gears, compressors, hydraulic devices, etc. It can be suitably used for lubrication in mechanisms such as converters, wet clutches, gear bearing mechanisms, oil pumps, and hydraulic control mechanisms.
  • it since it has excellent cooling properties and insulating properties, it can be suitably used for cooling and insulating motors and batteries.
  • the lubricating oil composition of one preferred embodiment of the present invention is excellent in rubber swelling resistance, it can also be suitably used for a portion in contact with an O-ring or a gasket.
  • Lubricating base oils were prepared by blending base oils of the types and blending amounts shown in Table 1. The 100° C. kinematic viscosity, viscosity index, and 15° C. density of the prepared base oil were measured or calculated, and the values shown in Table 1 were obtained.
  • Lubricating oil compositions were prepared by adding lubricating oil additives of the types and blending amounts shown in Table 1. The base oil components and lubricating oil additives used in the preparation of the lubricating base oil and the lubricating oil composition are as follows.
  • C28 diester bis(2-ethylhexyl) dodecanedioate, a diester having 28 carbon atoms represented by the following general formula (a1-i).
  • C26 diester bis(2-ethylhexyl) sebacate, a diester having 26 carbon atoms represented by the following general formula (a1-ii).
  • C22 diester bis(2-ethylhexyl) adipate, a diester having 22 carbon atoms represented by the following general formula (a1-iii).
  • C60 triester trimethylolpropane (oleic acid) triester, triester having 60 carbon atoms represented by the general formula (a2-i).
  • C30/C36 triester Trimethylolpropane (caprylic acid/capric acid) triester, triester having 30 carbon atoms represented by general formula (a2-iia) and general formula (a2-iib) A mixture with the represented C36 triester.
  • a lubricating oil composition having a coefficient of friction of less than 0.160 is a lubricating composition with a good friction-reducing effect.
  • Rubber Swelling Resistance Test A rubber immersion test was conducted according to JIS K6258. Specifically, test nitrile rubber (manufactured by NOK Co., Ltd., product name "A727”) is immersed in the lubricant base oil to be measured under the conditions of an immersion temperature of 100 ° C. and an immersion time of 144 hours. bottom. Then, the volume of the test piece was measured before and after the test, and the volume change rate was calculated from the following formula.
  • the lubricating oil compositions of Examples 1 to 7 had well-balanced properties in terms of insulation, friction reduction effect, and rubber swelling resistance.
  • the lubricating oil compositions of Comparative Examples 1 to 4 were inferior in at least one of insulating property, friction reducing effect, and rubber swelling resistance.

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