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
  • C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
  • C10M137/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
• • 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
  • C10M137/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
  • C10M137/04—Phosphate esters
  • C10M137/10—Thio derivatives
  • C10M137/105—Thio derivatives not containing metal
• • 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
  • C10M133/38—Heterocyclic nitrogen compounds
  • C10M133/44—Five-membered ring containing nitrogen and carbon only
• • 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
  • C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
  • C10M135/32—Heterocyclic sulfur, selenium or tellurium compounds
  • C10M135/36—Heterocyclic sulfur, selenium or tellurium compounds the ring containing sulfur and carbon with nitrogen or oxygen
• • 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
  • C10M157/00—Lubricating compositions characterised by the additive being a mixture of two or more macromolecular compounds covered by more than one of the main groups C10M143/00 - C10M155/00, each of these compounds being essential
  • C10M157/08—Lubricating compositions characterised by the additive being a mixture of two or more macromolecular compounds covered by more than one of the main groups C10M143/00 - C10M155/00, each of these compounds being essential at least one of them being a phosphorus-containing compound
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H57/00—General details of gearing
  • F16H57/04—Features relating to lubrication or cooling or heating
  • F16H57/0467—Elements of gearings to be lubricated, cooled or heated
  • F16H57/0476—Electric machines and gearing, i.e. joint lubrication or cooling or heating thereof
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
  • H02K11/30—Structural association with control circuits or drive circuits
  • H02K11/33—Drive circuits, e.g. power electronics
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
  • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
  • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K9/00—Arrangements for cooling or ventilating
  • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
• • 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
  • C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen 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
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
  • C10M2215/22—Heterocyclic nitrogen compounds
  • C10M2215/223—Five-membered rings containing nitrogen and carbon only
• • 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
• • 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
  • C10M2223/04—Phosphate esters
  • C10M2223/047—Thioderivatives not containing metallic elements
• • 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
  • 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
  • C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
• • 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
• • 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
  • C10N2040/29—Hybrid or electric engines
  • C10N2040/292—Electric engines

Definitions

• the present invention relates to lubricating oil compositions, electric drive units, uses of lubricating oil compositions, and methods for producing lubricating oil compositions.
• Patent Document 1 discloses, for the purpose of providing a lubricating oil composition for a transmission, which is capable of increasing high temperature stability and shear stability and suppressing a decrease in low temperature fluidity due to long-term use.
• a lubricating oil composition for a transmission is disclosed that contains a predetermined base oil and a predetermined amount of poly(meth)acrylate, and is characterized in that it satisfies predetermined parameters.
• Patent Document 2 discloses that a lubricating oil composition that has high extreme pressure properties, exhibits durability and wear resistance at a high level, and exhibits high volume ratio low efficiency
• a lubricating oil composition suitable for electric drive units is disclosed containing a phosphoric acid ester and a thiadiazole derivative.
• the lubricating oil composition used in the above electric drive unit is required to have properties such as scuffing resistance and copper corrosion resistance.
• properties such as scuffing resistance and copper corrosion resistance.
• the present inventors have determined that by adjusting the kinematic viscosity of the lubricating oil composition within a predetermined range and containing a predetermined phosphite, the lubricating oil composition can be used for a long time without reducing scuffing resistance without using a thiadiazole compound. It has been found that it is possible to provide a lubricating oil composition that exhibits excellent copper corrosion resistance even in a copper corrosion resistance test (for example, 168 hours in the Examples described below). The present invention has been completed based on the above findings. That is, the present invention provides the following aspects [1] to [9].
• a lubricating oil composition, wherein the lubricating oil composition has a kinematic viscosity at 100°C of 4.2 mm 2 /s or more.
• the phosphite compound (B) is at least one selected from a compound (B1) represented by the following general formula (b-1) and a compound (B2) represented by the following general formula (b-2).
• R B11 , R B21 and R B22 each independently represent an alkyl group having 1 to 19 carbon atoms, and bB11, bB21 and bB22 each independently represent an integer of 1 to 10.
• Base oil (A) is made from mineral oil, poly ⁇ -olefin, isoparaffin, polyalkylene glycol, ester synthetic oil, ether synthetic oil, alkylbenzene synthetic oil, alkylnaphthalene synthetic oil, GTL, CTL, and BTL.
• the base oil (A) contains at least one group having 2 to 19 carbon atoms, in which one -CH 2 - group with both ends bonded to a carbon atom is substituted with an -S- group in an alkyl group having 3 to 20 carbon atoms.
• a phosphite compound (B) with The content of the thiadiazole compound is less than 0.05% by mass based on the total amount of the lubricating oil composition, and the lubricating oil composition is prepared so that the kinematic viscosity at 100° C. is 4.2 mm 2 /s or more.
• a lubricating oil composition according to a preferred embodiment of the present invention is a lubricating oil composition having characteristics suitable for lubrication of various mechanisms incorporated in an apparatus, and a more specific embodiment of the lubricating oil composition is: Scuffing resistance and copper corrosion resistance can be improved in a well-balanced manner. Therefore, these lubricating oil compositions can be suitably used, for example, to lubricate an electric drive unit including at least a gear box and an electric motor.
• the upper and lower limits can be arbitrarily combined.
• a 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”
• the range and the range "40 to 100" are also included in the numerical ranges described herein.
• the description "60 to 100” means a range of "60 or more and 100 or less.”
• the numerical range from the lower limit value to the upper limit value can be defined by appropriately selecting from each option and combining them arbitrarily.
• a plurality of the various requirements described as preferred embodiments described herein can be combined.
• kinematic viscosity and viscosity index mean values measured or calculated based on JIS K2283:2000.
• the content of phosphorus atoms (P) means a value measured in accordance with JPI-5S-38-92.
• the content of sulfur atoms (S) means a value measured in accordance with JIS K2541-6:2013.
• the lubricating oil composition of one embodiment of the present invention includes a base oil (A) (hereinafter also referred to as “component (A)”) and a phosphite ester (B) (hereinafter also referred to as “component (B)”).
• component (A) base oil
• component (B) phosphite ester
• the content of the thiadiazole compound is less than 0.05% by mass based on the total amount of the lubricating oil composition, and the kinematic viscosity at 100°C of the lubricating oil composition is 4.2 mm 2 /s or more. .
• a lubricating oil composition according to another embodiment of the present invention contains a component (A) and a component (B), and the content of a thiadiazole compound and a benzotriazole compound is based on the total amount of the lubricating oil composition, respectively. It is less than 0.05% by mass, and the kinematic viscosity of the lubricating oil composition at 100° C. is 4.2 mm 2 /s or more.
• the lubricating oil composition of one embodiment of the present invention contains a phosphite (B) having a predetermined structure together with the base oil (A), so that the thiadiazole compound (C) Even when the content of the benzotriazole compound (D) is limited or substantially absent, a lubricating oil composition with improved scuffing resistance and copper corrosion resistance in a well-balanced manner can be obtained. Since the lubricating oil composition of one embodiment of the present invention has such characteristics, it can be suitably used, for example, to lubricate an electric drive unit that includes at least a gear box and an electric motor.
• the total content of components (A) and (B) is preferably 50% by mass or more, more preferably is 60% by mass or more, more preferably 70% by mass or more, still more preferably 75% by mass or more, even more preferably 80% by mass or more, even more preferably 85% by mass or more, particularly preferably 90% by mass or more, and , 100% by mass or less, 99.5% by mass or less, 99.0% by mass or less, or 98.0% by mass or less.
• the details of each component contained in the lubricating oil composition of one embodiment of the present invention will be described below.
• the base oil used as component (A) in one embodiment of the present invention includes one or more selected from mineral oils and synthetic oils.
• Mineral oils include, for example, atmospheric residual oils obtained by atmospheric distillation of crude oils such as paraffinic crude oils, intermediate base crude oils, and naphthenic crude oils; and distillate oils obtained by vacuum distillation of these atmospheric residual oils.
• Refined oil obtained by subjecting the distillate to one or more refining treatments such as solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, and hydrorefining (hydrocracking);
• Mineral oil (GTL) obtained by isomerizing wax (GTL wax) produced from natural gas by the Fischer-Tropsch process, etc.
• Wax (CTL) produced from coal by the Fischer-Tropsch process, etc.
• Mineral oil (CTL) obtained by isomerizing wax (Coal To Liquids WAX); Obtained by isomerizing wax (BTL wax (Biomass To Liquids WAX)) produced from biomass by the Fischer-Tropsch method etc. Examples include mineral oil (BTL).
• Synthetic oils include, for example, polyolefins such as ⁇ -olefin homopolymers or ⁇ -olefin copolymers (for example, ⁇ -olefin copolymers having 8 to 14 carbon atoms such as ethylene- ⁇ -olefin copolymers).
• ⁇ -olefins polyolefins
• isoparaffins polyalkylene glycols
• ester-based synthetic oils such as polyol esters, dibasic acid esters, and phosphoric acid esters
• ether-based synthetic oils such as polyphenyl ethers
• alkylbenzene-based synthetic oils alkylnaphthalene-based synthetic oils, etc.
• the lubricating oil composition of one embodiment of the present invention may contain, or substantially not contain, a cycloalkane-based synthetic oil as a base oil. More specifically, in the lubricating oil composition of one aspect of the present invention, the content of the cycloalkane-based synthetic oil is, for example, 0.05% based on the total amount of component (A) contained in the lubricating oil composition. It may be less than 0.03% by weight, less than 0.01% by weight, or less than 0.001% by weight.
• cycloalkane-based synthetic oil examples include naphthenic synthetic oils containing a cyclohexane ring, a cycloheptane ring, a bicycloheptane ring, a bicyclooctane ring, or the like.
• Component (A) used in one embodiment of the present invention preferably contains one or more selected from mineral oils classified into Group II and Group III of the API (American Petroleum Institute) base oil category, and synthetic oils.
• the kinematic viscosity at 100°C of component (A) used in one aspect of the present invention is preferably 2.5 mm 2 /s or more, more preferably 2.7 mm 2 /s or more, more preferably 2.9 mm 2 /s or more, particularly preferably 3.1 mm 2 /s or more, and from the viewpoint of providing a lubricating oil composition with excellent cooling properties, preferably 8.0 mm 2 /s or less, more preferably 7.5 mm 2 /s or less, even more preferably 7.0 mm 2 /s or less, even more preferably 6.5 mm 2 /s or less, particularly preferably 6.0 mm 2 / s s or less.
• the viscosity index of component (A) used in one aspect of the present invention is preferably 70 or more, more preferably 80 or more, even more preferably 90 or more, and particularly preferably 100 or more.
• a mixed oil in which two or more types of base oils are used as component (A) it is preferable that the kinematic viscosity and viscosity index of the mixed oil are within the above ranges. Therefore, a low viscosity base oil and a high viscosity base oil may be used in combination to prepare the mixed oil so as to have a kinematic viscosity and a viscosity index within the above ranges.
• the mixed oil may be a mixture of two or more base oils whose kinematic viscosity and viscosity index at 100°C fall within the ranges described above; It may be a mixed oil that is a combination of a base oil that belongs to the above range and a base oil that does not belong to the above range.
• a mixed oil may be prepared by combining a low viscosity base oil and a high viscosity base oil whose kinematic viscosity and viscosity index at 100° C. do not fall within the above range, and which are adjusted to fall within the above range.
• kinematic viscosity and viscosity index at 100°C of component (A) do not fall within the above-mentioned range, it is sufficient as long as the kinematic viscosity and viscosity index at 100°C of the lubricating oil composition belong to the ranges described below. .
• the content of component (A) is preferably 30% by mass or more, more preferably 40% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition. , more preferably 50% by mass or more, still more preferably 60% by mass or more, even more preferably 70% by mass or more, even more preferably 80% by mass or more, particularly preferably 90% by mass or more, and 99.9% by mass % or less, 99.5% by mass or less, 99.0% by mass or less, 98.5% by mass or less, or 98.0% by mass or less.
• the lubricating oil composition of one embodiment of the present invention includes, as component (B), at least one -(S)x- group (x is an integer of 1 or more) between two adjacent carbon atoms in the structure of the alkyl group. , preferably an integer of 1 to 10, more preferably an integer of 1 to 5, even more preferably an integer of 1 to 3, even more preferably 1 or 2, particularly preferably 1). Contains a phosphite having at least one sulfur atom-containing group having 2 to 20 carbon atoms. By containing component (B) in a lubricating oil composition having a predetermined 100° C.
• the lubricating oil composition can have improved scuffing resistance and copper corrosion resistance.
• component (B) may be used alone or in combination of two or more. Further, component (B) may have one or two sulfur atom-containing groups in the same molecule. Phosphite esters having one sulfur atom-containing group in the same molecule (phosphite monoester) and phosphite esters having two sulfur atom-containing groups (phosphite diester) can be used individually. Although they may be used or both may be used together, it is preferable to use a phosphorous acid monoester and a phosphorous diester together from the viewpoint of producing a lubricating oil composition with further improved scuffing resistance.
• the sulfur atom-containing group included in the phosphorous acid ester of component (B) is preferably a group represented by the following general formula (bi).
• R b is a linear or branched alkyl group
• a b is a linear or branched alkylene group
• the total number of carbon atoms of R b and A b is It is between 2 and 20.
• x is an integer of 1 or more. * indicates the bonding position with the phosphorus atom.
• the total carbon number of R b and A b is 2 to 20, but from the viewpoint of providing a lubricating oil composition with further improved scuffing resistance, it is preferably 3 to 18, more preferably 4 to 16, even more preferably is from 5 to 14, more preferably from 6 to 12.
• x is an integer of 1 or more, but from the viewpoint of providing a lubricating oil composition with improved copper corrosion resistance, x is preferably an integer of 1 to 10, more preferably an integer of 1 to 5, and even more preferably 1. An integer of 3 to 3, more preferably 1 or 2, particularly preferably 1.
• the number of carbon atoms in the alkyl group that can be selected as R b is preferably 1 to 18, more preferably 1 to 16, even more preferably 3 to 14, even more preferably 4 to 12, particularly preferably 6 to 10. .
• Examples of the alkyl group that can be selected as R b 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), pentyl group, hexyl group, 2-ethylhexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl, tetradecyl group, hexadecyl group, octadecyl group, etc.
• the number of carbon atoms in the alkylene group that can be selected as A b is preferably 1 to 18, more preferably 1 to 16, more preferably 1 to 12, still more preferably 1 to 10, even more preferably 1 to 8, and even more preferably The number is preferably 1 to 6, particularly preferably 2 to 4.
• Examples of the alkylene group that can be selected as A b include methylene group, 1,1-ethylene group, 1,2-ethylene group, 1,3-propylene, 1,2-propylene, 2,2-propylene, etc.
• the alkylene group that can be selected as A b is -(CH 2 ) n - (n is an integer of 1 to 19, preferably an integer of 1 to 16, more preferably an integer of 1 to 12, and (preferably an integer of 1 to 10, more preferably an integer of 1 to 8, even more preferably an integer of 1 to 6, particularly preferably an integer of 2 to 4).
• Examples of the phosphorous ester used as component (B) in one embodiment of the present invention include phosphorous esters represented by the following general formula (b-1) or (b-2).
• R B11 , R B21 , and R B22 are each independently a linear or branched alkyl group, and each independently has preferably 1 to 18 carbon atoms, more preferably 1 to 18 carbon atoms. 16, more preferably 3 to 14, even more preferably 4 to 12, particularly preferably 6 to 10.
• bB11, bB21 and bB22 are each independently an integer of 1 to 10, preferably 1 to 19, more preferably 1 to 16, more preferably 1 to 12, still more preferably 1 to 10, even more preferably is from 1 to 8, more preferably from 1 to 6, particularly preferably from 2 to 4.
• the alkyl group that can be selected as R B11 , R B21 , and R B22 is the same as the alkyl group that can be selected as R B1 in the general formula (bi), and the preferred number of carbon atoms and specific The same is true for other groups.
• the phosphite used as component (B) in one embodiment of the present invention may be in the form of an amine salt.
• the amine that forms the amine salt is preferably a compound represented by the following general formula (b-3).
• the amines may be used alone or in combination of two or more.
• R x is each independently an alkyl group having 6 to 18 carbon atoms, an alkenyl group having 6 to 18 carbon atoms, an aryl group having 6 to 18 carbon atoms, or a hydroxyalkyl group having 6 to 18 carbon atoms.
• the plurality of R x may be the same or different from each other.
• the total content of component (B) is based on the total amount (100% by mass) of the lubricating oil composition, and the lubricating oil composition has improved scuffing resistance. From the viewpoint of From the viewpoint of obtaining a lubricating oil composition with improved properties, preferably less than 1.00% by mass, more preferably 0.95% by mass or less, more preferably 0.90% by mass or less, even more preferably 0.85% by mass.
• mass% or less even more preferably 0.80 mass% or less, even more preferably 0.75 mass% or less, even more preferably 0.70 mass% or less, even more preferably 0.65 mass% or less, even more Preferably 0.60% by mass or less, even more preferably 0.55% by mass or less, even more preferably 0.50% by mass or less, even more preferably 0.45% by mass or less, particularly preferably 0.40% by mass. It is as follows.
• component (B) is represented by the general formula (b-1). It is preferable to contain both the compound (B1) represented by the formula (B1) and the compound (B2) represented by the general formula (b-2).
• the content ratio [(B1)/(B2)] of compound (B1) and compound (B2) is preferably 1/20 to 20/1, more preferably 1/20 to 20/1 in terms of mass ratio. 1/18 to 18/1, more preferably 1/16 to 16/1, even more preferably 1/14 to 14/1, even more preferably 1/12 to 12/1, particularly preferably 1/10 to 10 /1.
• the content of component (B) in terms of phosphorus atoms is preferably 20 mass ppm based on the total amount (100% by mass) of the lubricating oil composition.
• more preferably 50 mass ppm or more more preferably 100 mass ppm or more, still more preferably 120 mass ppm or more, still more preferably 150 mass ppm or more, even more preferably 170 mass ppm or more, particularly preferably 200 mass ppm or more.
• the content of component (B) in terms of sulfur atoms is preferably 10 ppm by mass based on the total amount (100% by mass) of the lubricating oil composition.
• more preferably 50 mass ppm or more more preferably 100 mass ppm or more, still more preferably 150 mass ppm or more, still more preferably 170 mass ppm or more, even more preferably 200 mass ppm or more, particularly preferably 230 mass ppm or more.
• the content of the thiadiazole compound is limited to less than 0.05% by mass based on the total amount of the lubricating oil composition. If the content of the thiadiazole compound is 0.05% by mass or more, copper will turn black in a long-term copper corrosion test.
• the lubricating oil composition of one embodiment of the present invention contains the above component (B) while limiting the content of thiadiazole as described above, and adjusts the kinematic viscosity of the lubricating oil composition at 100°C to a predetermined range. This makes it possible to obtain a lubricating oil composition with improved scuffing resistance and copper corrosion resistance in a well-balanced manner.
• the content of the thiadiazole compound is less than 0.05% by mass, more preferably less than 0.03% by mass, and even more preferably 0.05% by mass, based on the total amount of the lubricating oil composition. It is less than 0.01% by weight, particularly preferably less than 0.001% by weight.
• the lubricating oil composition of one embodiment of the present invention preferably does not substantially contain a thiadiazole compound.
• "not substantially containing a thiadiazole compound” means excluding lubricating oil compositions that intentionally contain a thiadiazole compound, and does not include lubricating oil compositions in which a thiadiazole compound is unavoidably blended.
• the content of such thiadiazole compounds is as small as possible.
• the content of the thiadiazole compound that is unavoidably mixed is less than 0.05% by mass, more preferably less than 0.03% by mass, and even more preferably 0. It is less than 0.01% by weight, particularly preferably less than 0.001% by weight.
• the thiadiazole compound includes a compound having a thiadiazole ring, and may be, for example, a compound represented by any of the following general formulas (c-1) to (c-4).
• R c1 and R c2 are each independently a hydrocarbon group.
• m and n may each independently be an integer of 1 to 10, an integer of 1 to 6, an integer of 1 to 4, or an integer of 2 to 3.
• hydrocarbon groups that can be selected as R c1 and R c2 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), pentyl group, hexyl group, heptyl group, octyl group, 2-ethylhexyl group, nonyl group, 1,1-dimethylheptyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group linear or branched alkyl groups such as pentadecyl, hexadecyl, heptadecyl, octadecyl; ethenyl, propenyl, butenyl, pentenyl, hexenyl, hep
• the number of carbon atoms in the hydrocarbon group that can be selected as R c1 and R c2 may be 1 or more, 2 or more, 3 or more, or 5 or more, and may also be 30 or less, 20 or less, 16 or less, or 12 It may be the following.
• the content of the benzotriazole compound is limited to less than 0.05% by mass based on the total amount of the lubricating oil composition.
• the lubricating oil composition of one embodiment of the present invention contains the above component (B) while limiting the content of the benzotriazole compound as described above, and the lubricating oil composition has a kinematic viscosity at 100°C within a predetermined range. Through adjustment, it is possible to obtain a lubricating oil composition with improved scuffing resistance and copper corrosion resistance in a well-balanced manner.
• the content of the benzotriazole compound is less than 0.05% by mass, more preferably less than 0.03% by mass, even more preferably less than 0.03% by mass, based on the total amount of the lubricating oil composition. It is less than 0.01% by weight, particularly preferably less than 0.001% by weight.
• the lubricating oil composition of one embodiment of the present invention preferably does not substantially contain a benzotriazole compound.
• "not substantially containing a benzotriazole compound” means excluding lubricating oil compositions that intentionally contain a benzotriazole compound, and does not contain a benzotriazole compound unavoidably.
• the content of such a benzotriazole compound is as small as possible, although this does not exclude embodiments in which the benzotriazole compound is removed.
• the content of the benzotriazole compound that is unavoidably mixed is less than 0.05% by mass, more preferably less than 0.03% by mass, even more preferably less than 0.03% by mass, based on the total amount of the lubricating oil composition. It is less than 0.01% by weight, particularly preferably less than 0.001% by weight.
• the benzotriazole compound includes a compound having a benzotriazole structure, and includes, for example, a compound represented by the following general formula (d-0).
• R D1 is a hydrocarbon group or a hydrogen atom that may contain at least one atom selected from the group consisting of an oxygen atom, a sulfur atom, and a nitrogen atom.
• R D2 is a hydrocarbon group that may each independently contain at least one atom selected from the group consisting of an oxygen atom, a sulfur atom, and a nitrogen atom.
• z1 may be an integer from 0 to 4, an integer from 0 to 2, or an integer from 0 to 1.
• hydrocarbon group examples include an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, and a group formed by combining two or more of these groups.
• the number of carbon atoms in the hydrocarbon group that can be selected as R D1 is, for example, 1 to 30, but may also be 3 to 26, or 6 to 20.
• the number of carbon atoms in the hydrocarbon group that can be selected as R D2 is, for example, 1 to 20, but may also be 1 to 12, 1 to 6, or 1 to 2.
• alkyl group examples include methyl group, ethyl group, propyl group (n-propyl group, i-propyl group), butyl group (n-butyl group, i-butyl group, s-butyl group, t-butyl group).
• the alkyl group may be a straight-chain alkyl group or a branched-chain alkyl group.
• alkenyl group examples include ethenyl group (vinyl group), propenyl group, butenyl group, pentenyl group, hexenyl group, heptenyl group, octenyl group, nonenyl group, decenyl group, dodecenyl group, tridecenyl group, tetradecenyl group, Examples include pentadecenyl group, hexadecenyl group, octadecenyl group (oleyl group), and the like.
• the alkenyl group may be a straight chain alkenyl group or a branched chain alkenyl group.
• cycloalkyl group examples include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, and an adamantyl group.
• aryl group examples include a phenyl group, a naphthyl group, an anthryl group, a phenanthryl group, a biphenyl group, a terphenyl group, a phenylnaphthyl group, and the like.
• the lubricating oil composition of one embodiment of the present invention may contain various additives as necessary within a range that does not impair the effects of the present invention.
• additives include pour point depressants, viscosity index improvers, antioxidants, metallic detergents, ashless dispersants, rust preventives, antifoaming agents, and the like. These lubricating oil additives may be used alone or in combination of two or more.
• each of these various additives can be adjusted as appropriate within a range that does not impair the effects of the present invention, but the content of each additive may be adjusted based on the total amount (100% by mass) of the lubricating oil composition. Independently, it is usually 0.001 to 15% by weight, preferably 0.005 to 10% by weight, more preferably 0.01 to 8% by weight.
• the lubricating oil composition of one aspect of the present invention may further contain a pour point depressant.
• the pour point depressants may be used alone or in combination of two or more.
• Examples of pour point depressants used in one embodiment of the present invention include ethylene-vinyl acetate copolymers, condensates of chlorinated paraffins and naphthalene, condensates of chlorinated paraffins and phenols, polymethacrylates, and polyalkylstyrenes. etc.
• the mass average molecular weight (Mw) of the pour point depressant used in one aspect of the present invention is 5,000 or more, 7,000 or more, 10,000 or more, 15,000 or more, 20,000 or more, 25,000 or more, 30,000 or more, 35,000 or more, 40,000 or more, 45,000 or more, 50,000 or more, 55,000 or more, or 60,000 or more, and 150,000 or less, 120,000 or less , 100,000 or less, 90,000 or less, or 80,000 or less.
• the lubricating oil composition of one embodiment of the present invention may further contain a viscosity index improver.
• the viscosity index improvers may be used alone or in combination of two or more.
• Examples of the viscosity index improver used in one embodiment of the present invention include non-dispersed polymethacrylate, dispersed polymethacrylate, olefin copolymer (e.g., ethylene-propylene copolymer, etc.), and dispersed olefin copolymer.
• 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; , 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.
• the lubricating oil composition of one embodiment of the present invention may further contain an antioxidant.
• the antioxidants may be used alone or in combination of two or more.
• examples of the antioxidant used in one embodiment of the present invention include amine antioxidants such as alkylated diphenylamine, phenylnaphthylamine, and alkylated phenylnaphthylamine; 2,6-di-t-butylphenol, and 4,4'-methylenebis (2,6-di-t-butylphenol), isooctyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, n-octadecyl-3-(3,5-di-t-butyl-4 Examples include phenolic antioxidants such as -hydroxyphenyl)propionate; sulfur-based antioxidants such as phenothiazine, dioctadecyl sulfide, dilauryl-3,3'-thio
• Metal cleaning agent The lubricating oil composition of one embodiment of the present invention may further contain a metal-based detergent.
• Metal-based detergents may be used alone or in combination of two or more.
• Metal-based detergents used in one embodiment of the present invention include metal salts such as metal sulfonates, metal salicylates, and metal phenates.
• the metal atoms constituting the metal salt are preferably metal atoms selected from alkali metals and alkaline earth metals, more preferably sodium, calcium, magnesium, or barium, and still more preferably calcium.
• the metal detergent preferably contains one or more selected from calcium sulfonate, calcium salicylate, and calcium phenate, and more preferably contains calcium sulfonate.
• the content of calcium sulfonate is preferably 50 to 100% by mass, more preferably 60 to 100% by mass, even more preferably 70% by mass, based on the total amount (100% by mass) of the metal detergent contained in the lubricating oil composition. ⁇ 100% by weight, more preferably 80 ⁇ 100% by weight.
• the base number of the metal detergent is preferably 0 to 600 mgKOH/g.
• the metal-based detergent is preferably an overbased metal-based detergent having a base value of 100 mgKOH/g or more.
• the base number of the overbased metal 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 number test method”. means the base number measured according to the perchloric acid method.
• the lubricating oil composition of one embodiment of the present invention may further contain an ashless dispersant from the viewpoint of improving the dispersibility of component (B).
• the ashless dispersants may be used alone or in combination of two or more.
• the ashless dispersant used in one aspect of the present invention is preferably an alkenylsuccinimide, such as an alkenylsuccinimide represented by the following general formula (e-1), or an alkenylsuccinimide represented by the following general formula (e-2). Examples include the alkenylsuccinic acid monoimides shown below.
• R E1 , R E2 and R E3 are each independently an alkenyl group having a mass average molecular weight (Mw) of 500 to 3000 (preferably 900 to 2500). It is.
• Examples of the alkenyl group that can be selected as R E1 , R E2 and R E3 include a polybutenyl group, a polyisobutenyl group, an ethylene-propylene copolymer, and among these, a polybutenyl group or a polyisobutenyl group is preferred.
• a E1 , A E2 and A E3 are each independently an alkylene group having 2 to 5 carbon atoms.
• e1 is an integer of 0 to 10, preferably an integer of 1 to 4, more preferably 2 or 3.
• e2 is an integer of 1 to 10, preferably an integer of 2 to 5, more preferably 3 or 4.
• the compound represented by the general formula (e-1) or (e-2) is one or more selected from boron compounds, alcohols, aldehydes, ketones, alkylphenols, cyclic carbonates, epoxy compounds, organic acids, etc. It may also be a modified alkenylsuccinimide reacted with.
• the lubricating oil composition of one embodiment of the present invention may further contain a rust inhibitor.
• the rust inhibitors may be used alone or in combination of two or more.
• Examples of the rust preventive agent used in one embodiment of the present invention include fatty acids, alkenyl succinic acid half esters, fatty acid soaps, alkyl sulfonates, polyhydric alcohol fatty acid esters, fatty acid amines, oxidized paraffins, alkyl polyoxyethylene ethers, and the like. Can be mentioned.
• the lubricating oil composition of one embodiment of the present invention may further contain an antifoaming agent.
• Antifoaming agents may be used alone or in combination of two or more. Examples of the antifoaming agent used in one embodiment of the present invention include alkyl silicone antifoaming agents, fluorosilicone antifoaming agents, fluoroalkyl ether antifoaming agents, and the like.
• a method for producing a lubricating oil composition according to one aspect of the present invention includes a step of blending component (B) with component (A), and a kinematic viscosity of the lubricating oil composition at 100° C. of 4.2 mm 2 /s or more.
• the process includes the step of preparing Furthermore, the method for producing a lubricating oil composition according to one embodiment of the present invention does not include the step of blending a thiadiazole compound.
• a method for producing a lubricating oil composition according to another embodiment of the present invention does not include the step of blending a benzotriazole compound.
• a lubricating oil composition according to yet another embodiment of the present invention does not include the step of blending a thiadiazole compound and a benzotriazole compound.
• the method for producing a lubricating oil composition according to one embodiment of the present invention preferably includes a step of blending other additives as necessary. Suitable compounds and blending amounts of component (A), component (B), and various additives are as described above. Furthermore, additives such as viscosity index improvers, pour point depressants, and antifoaming agents are preferably blended in a dissolved state in the diluent oil.
• the kinematic viscosity at 100° C. of the lubricating oil composition of one embodiment of the present invention is preferably 4.2 mm 2 /s or more, more preferably 4.2 mm 2 /s or more, from the viewpoint of providing a lubricating oil composition with further improved scuffing resistance.
• the viscosity index of the lubricating oil composition of one embodiment of the present invention is preferably 90 or more, more preferably 100 or more, even more preferably 110 or more, even more preferably 120 or more, and particularly preferably 130 or more.
• a lubricating oil composition according to a preferred embodiment of the present invention can improve scuffing resistance and copper corrosion resistance in a well-balanced manner.
• the lubricating oil composition of one embodiment of the present invention is suitable for use in torque converters, wet clutches, etc., which are incorporated into various devices such as engines, transmissions, speed reducers, compressors, and hydraulic devices. , gear bearing mechanisms, oil pumps, hydraulic control mechanisms, and other mechanisms.
• the lubricating oil composition of one embodiment of the present invention is preferably used for lubricating various mechanisms of an electric drive unit including at least a gear box and an electric motor.
• Electric drive units are installed in fuel cell vehicles, electric vehicles, and hybrid vehicles.
• the lubricating oil composition of one embodiment of the present invention plays the role of cooling the electric motor and lubricating the gearbox.
• the lubricating oil composition of one embodiment of the present invention has excellent scuffing resistance and copper corrosion resistance, so it provides good lubricity for gearboxes. It also has the property of preventing corrosion of the copper-based members that make up the electric motor when used to cool the motor.
• the present invention can also provide the following [1] and [2].
• Examples 1 to 3 Comparative Examples 1 to 5 Components (A) and (B) shown in Table 2 and other additives were added in the amounts shown in Table 1 and thoroughly mixed to prepare lubricating oil compositions. Details of each component used in the preparation of the lubricating oil composition are as follows. Note that none of the lubricating oil compositions of Examples 1 to 3 contained a benzotriazole compound.
• ⁇ Extreme pressure agent tritolyl phosphate.
• Viscosity index improver Polymethacrylate-based viscosity index improver (content in terms of resin content: 0.13% by mass).
• Additional mixture An additive mixture in which an antioxidant, a metal detergent, an ashless dispersant, a pour point depressant, and an antifoaming agent are mixed and diluted with 70N hydrocracked mineral oil.
• the lubricating oil compositions prepared in Examples 1 to 3 had excellent scuffing resistance and excellent copper corrosion resistance.
• Comparative Examples 1, 2, and 5 although the copper corrosion resistance was good, the scuffing resistance was poor. Further, in Comparative Examples 3 and 4, although the scuffing resistance was good, the copper corrosion resistance was poor.

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