Lubricating base oil

Abstract

To provide a lubricating base oil capable of preparing a lubricating oil composition having little influence on the environment and excellent in various lubricating characteristics.SOLUTION: A lubricant base oil having a nature-derived index (ISO16128) of 100% and containing a monoester compound having one or more branched chain structures and 18 or more carbon atoms.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a lubricating base oil and a lubricating oil composition comprising the lubricating base oil. [Background technology]

[0002] In recent years, the lubricating oil compositions used in automobiles have been developed with consideration given to their impact on the environment. For example, Patent Document 1 discloses a technology for reducing fuel consumption in order to reduce carbon dioxide emissions. The target is the structure and content of polymer components, NOACK evaporation amount and boiling point in the range of 350 to 400°C. The present invention discloses a lubricating oil composition having an adjusted content of a fraction in the range of 100 to 2000 ppm. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-25025 Summary of the Invention [Problem to be solved by the invention]

[0004] From the viewpoint of life cycle assessment, lubricating oil compositions have various functions not only during use but also during the life cycle. In addition, there is a growing demand to consider the impact on the environment when disposing of such materials. A lubricant that can prepare a lubricating oil composition that is excellent in various lubricating properties while reducing the environmental impact when disposed of is provided. There is a demand for lubricating base oils. [Means for solving the problem]

[0005] The present invention relates to a method for producing a lactic acid bacteria having a natural origin index (ISO 16128) of 100% and one or more branches. A lubricating base oil containing a monoester compound having a chain structure and having 18 or more carbon atoms, and A lubricating oil composition is provided that includes an oil base oil. Specifically, the present invention provides a lubricating base oil and a lubricating oil composition according to the following aspects [1] to [8]. do. [1] The natural origin index (ISO 16128) is 100%. A lubricating oil base containing a monoester compound having one or more branched chain structures and 18 or more carbon atoms. oil. [2] The monoester compound is a compound represented by the following general formula (1), ] The lubricating base oil described in [ka] (In the above formula, R 1 and R 2 are each independently a hydrocarbon group, and R 1 and R 2 of At least one of them is a branched chain hydrocarbon group. 1 and R 2 The total number of carbon atoms is 17 or more. Above.) [3] R in the general formula (1) 1 is an alkyl or alkenyl group having 8 or more carbon atoms, R 2 is an alkyl or alkenyl group having 5 or more carbon atoms, and R 1 and R 2 At least The lubricating base oil according to [2] above, wherein one of the groups is a branched alkyl group or a branched alkenyl group. . [4] R in the general formula (1) 1 and R 2 are each independently a branched alkyl group or The lubricating base oil according to the above [2] or [3], wherein the alkenyl group is a branched chain alkenyl group. [5] Any one of the above [1] to [4], wherein the pour point of the lubricating base oil is 0°C or lower. The lubricating base oil according to claim 1. [6] Immerse the test acrylic rubber in the lubricating base oil and measure it according to JIS K6258. The volume change rate of the test acrylic rubber measured under conditions of 150°C for 72 hours is 20%. The lubricating base oil according to any one of the above [1] to [5], wherein the viscosity is less than 1000 MPa. [7] A lubricating oil composition comprising the lubricating base oil according to any one of [1] to [6] above. [8] In addition, pour point depressants, viscosity index improvers, antioxidants, extreme pressure agents, metallic detergents, One or more selected from ash-based dispersants, metal deactivators, friction modifiers, rust inhibitors, and antifoaming agents The lubricating oil composition according to [7] above, which contains a lubricating oil additive. [Effects of the Invention]

[0006] A preferred embodiment of the lubricating base oil of the present invention is a lubricating base oil that reduces the environmental impact when disposed of. Even so, it is possible to prepare a lubricating oil composition that is excellent in various lubricating properties. DETAILED DESCRIPTION OF THE INVENTION

[0007] Regarding the numerical ranges described in this specification, the upper and lower limits can be combined in any combination. For example, the numerical range is preferably 30 to 100, more preferably 40 to 100. If "80" is listed, the range "30-80" or "40-100" is also The numerical ranges described in this specification are included in the numerical ranges. It is preferably 30 or more, more preferably 40 or more, and is preferably 100 or less, more preferably If it says "is 80 or less," it should be in the range of "30 to 80" or "40 to 100." and ranges are also included in the numerical ranges described herein. In addition, as a numerical range described in this specification, for example, "60 to 100" This means that the range is "60 or more and 100 or less."

[0008] In this specification, kinematic viscosity and viscosity index are based on JIS K2283:2000. It means a measured or calculated value.

[0009] [Configuration of lubricating base oil] The lubricating base oil of one embodiment of the present invention has a natural origin index (ISO 16128) of 100%. Therefore, it includes monoester compounds having one or more branched chain structures and having 18 or more carbon atoms. In this specification, the natural origin index is a value calculated in accordance with ISO 16128. The raw materials used to manufacture lubricating base oils include plants, animals, algae, bacteria and fungi. Indicates the percentage of natural materials derived from microorganisms and minerals. That is, the lubricating base oil of one embodiment of the present invention has an auto-calculated viscosity calculated in accordance with ISO 16128. With a natural origin index of 100%, all ingredients are derived from natural sources.

[0010] For example, in the automotive industry, lubricating oil compositions are subject to life cycle assessment. On the other hand, there is a demand for reducing the impact on the environment when they are disposed of. The lubricating base oil of one embodiment of the present invention is a natural lubricating base oil that is used in order to reduce the environmental impact upon disposal. It is made up of raw materials with an origin index (ISO 16128) of 100%. Furthermore, when the lubricating base oil of one embodiment of the present invention is composed of plant-derived raw materials, Even though carbon dioxide is generated by burning the material when it is disposed of, the plants that make up the material do not generate carbon dioxide during their growth process. Because they absorb carbon dioxide, the amount of carbon dioxide in the atmosphere does not increase over their entire life cycle. The balance of carbon dioxide emissions will be essentially zero, making it "carbon neutral."

[0011] The lubricating base oil of one embodiment of the present invention is composed of a monoester compound. Monoester compounds are formed by an ester reaction between a monocarboxylic acid component and an alcohol component. It can be generated. It is also described in Patent Document 1, etc., and is a 2-hydroxybenzoate of palmitic acid, which is generally known as a lubricating base oil. Ethylhexyl is produced by the esterification reaction of palmitic acid with 2-ethylhexanol. However, 2-ethylhexanol is a petroleum-derived raw material and is not specified in ISO 16128. Therefore, the natural origin index of 2-ethylhexyl palmitate is is not 100%. On the other hand, the lubricating base oil of one embodiment of the present invention has a natural origin index (ISO 16128) of 10 Since the monocarboxylic acid component and alcohol that are the raw materials for the monoester compound are Both of the components must be derived from natural raw materials. The base oil may be a lubricating base oil that reduces the environmental impact upon disposal. In addition, from the viewpoint of providing a lubricating base oil that is treated as carbon neutral, one aspect of the present invention is The lubricating base oil is a monoester made from plant-derived monocarboxylic acid components and alcohol components. It is preferable that the material is made of a ester compound.

[0012] In addition, the lubricating base oil of one embodiment of the present invention has one or more branched chain structures and has 18 or more carbon atoms. The monoester compound having such a structure is included. , various properties required for lubricating base oil (e.g., viscosity characteristics, pour point, flash point, rubber swelling resistance) Therefore, by using this lubricating base oil, A lubricating oil composition having excellent lubricating properties can be obtained.

[0013] In one embodiment of the lubricating base oil of the present invention, the monoester compound is However, from the viewpoint of obtaining a lubricating base oil with a lower pour point, it is preferable to have two or more It is preferable that the monoester compound has the above branched chain structure, and the monoester compound has 2 to 5 branched chain structures. It is more preferable that the monoester compound has the following structure: More preferably, it is an ester compound.

[0014] In one embodiment of the lubricating base oil of the present invention, the monoester compound has 18 or more carbon atoms. However, it is desirable to have a high viscosity and high flash point, as well as a lubricating oil with improved resistance to rubber swelling. From the viewpoint of using it as a base oil, it is preferably 19 or more, more preferably 20 or more, and more preferably 21 or more, more preferably 22 or more, even more preferably 23 or more, still more preferably 24 or more, particularly preferably 25 or more, and 70 or less, 65 or less, 60 or less, 55 or less , 50 or less, 48 ​​or less, 46 or less, 45 or less, 44 or less, 42 or less, 40 or less, 38 or less , 37 or less, 36 or less, 35 or less, 34 or less, 33 or less, 32 or less, 31 or less, 30 or less , 29 or less, or 28 or less.

[0015] The lubricating base oil of one embodiment of the present invention has a natural origin index of 100% and is The composition may contain compounds other than the monoester compounds as long as they do not impair all of the various properties. stomach. However, lubricants with excellent properties (e.g., viscosity characteristics, pour point, flash point, resistance to rubber swelling, etc.) From the viewpoint of using it as a lubricating base oil, the monoester compound contained in the lubricating base oil of one aspect of the present invention is The content ratio of the substance is preferably 50 to 10% by mass based on the total amount (100% by mass) of the lubricating base oil. 0 mass%, more preferably 60 to 100 mass%, more preferably 70 to 100 mass%, and further Preferably, the content is 80 to 100% by mass, more preferably 85 to 100% by mass, and even more preferably Preferably 90 to 100% by mass, more preferably 95 to 100% by mass, and particularly preferably 98 to 100% by mass. ~100% by mass.

[0016] In the lubricating base oil of one embodiment of the present invention, various properties (e.g., viscosity characteristics, pour point, flash point From the viewpoint of providing a lubricating base oil excellent in properties such as rubber swelling resistance, the monoester compound is The compound is preferably represented by the following general formula (1). [ka]

[0017] In the above general formula (1), R 1 and R 2 are each independently a hydrocarbon group, and R 1 and R 2 At least one of the groups is a branched chain hydrocarbon group. The branched hydrocarbon group may be a group having one or more branching points. A group having two branching points is preferred, and a group having one branching point is more preferred. preferable.

[0018] Also, R 1 and R 2 The total number of carbon atoms is 17 or more, but when it comes to high viscosity and high flash point, In order to obtain a lubricating base oil with improved resistance to rubber swelling, both of them are preferably 18 or more. More preferably, it is 19 or more, more preferably, it is 20 or more, even more preferably, it is 21 or more, and even more preferably, it is or 22 or more, even more preferably 23 or more, particularly preferably 24 or more, 70 or less, 65 or less, 60 or less, 55 or less, 50 or less, 48 ​​or less, 46 or less, 45 or less, 44 or less, 42 or less, 40 or less, 38 or less, 37 or less, 36 or less, 35 or less, 34 or less, 33 or less, 32 or less, 31 or less, 30 or less, 29 or less, 28 or less, or 27 or less good.

[0019] R in the above general formula (1) 1 The carbon number of the olefin increases viscosity and flash point, and also increases resistance to rubber swelling. From the viewpoint of obtaining a lubricating base oil with improved properties, the molecular weight of the lubricating base oil is preferably 8 or more, more preferably 9 or more. or more, more preferably 10 or more, more preferably 11 or more, even more preferably 12 or more, Preferably 13 or more, even more preferably 14 or more, even more preferably 15 or more, particularly Preferably, it is 16 or more, and 40 or less, 35 or less, 30 or less, 28 or less, or 26 or less. , 25 or less, 24 or less, 23 or less, 22 or less, 21 or less, or 20 or less.

[0020] R in the above general formula (1) 2 The carbon number of the olefin increases viscosity and flash point, and also increases resistance to rubber swelling. From the viewpoint of obtaining a lubricating base oil with improved properties, the molecular weight of the lubricating base oil is preferably 5 or more, more preferably 6 or more. More preferably, it is 7 or more, and even more preferably, it is 8 or more. Below, 22 or less, 20 or less, 18 or less, 16 or less, 15 or less, 14 or less, 13 or less, or 1 It may be set to 2 or less.

[0021] R 1 and R 2 Examples of the hydrocarbon group that can be selected include alkyl groups, alkoxy groups, and the like. aryl group, cycloalkyl group, aryl group, alkylaryl group, arylalkyl group, etc. Examples include:

[0022] Examples of the alkyl group include a methyl group, an ethyl group, a propyl group (n-propyl group), and , isopropyl group), butyl group (n-butyl group, s-butyl group, t-butyl group, isobutyl group ethyl group), pentyl group, hexyl group, heptyl group, octyl group, 2-ethylhexyl group, 1 -methylheptyl group, nonyl group, 1-methyloctyl group, 1,1-dimethylheptyl group, Decyl group, 1-methylheptyl group, undecyl group, 1-methyldecyl group, dodecyl group, 1 -methylundecyl group, tridecyl group, 1-methyldodecyl group, tetradecyl group, 1-methyl ethyltridecyl group, pentadecyl group, 1-methyltetradecyl group, hexadecyl group, 1- Methylpentadecyl group, heptadecyl group, 1-methylhexadecyl group, octadecyl group, Straight-chain alkyl groups such as 1-methylheptadecyl, nonadecyl, and 1-methyloctadecyl groups or branched alkyl groups.

[0023] Examples of the alkenyl group include an ethenyl group, a propenyl group, a butenyl group, and a pentyl group. nyl group, hexenyl group, heptenyl group, octenyl group, methylheptenyl group, nonyl group, Methyloctenyl group, decenyl group, methylnonyl group, undecenyl group, methyldecenyl group , dodecenyl group, methylundecenyl group, tridecenyl group, methyldodecenyl group, tetra Decenyl group, methyltridecenyl group, pentadecenyl group, methyltetradecenyl group, hexadecenyl group a pentadecenyl group, a heptadecenyl group, a methylhexadecenyl group, Octadecenyl group, methylheptadecenyl group, nonadecenyl group, methyloctadecenyl group and the like.

[0024] Examples of the cycloalkyl group include a cyclohexyl group and a dimethylcyclohexyl group. group, ethylcyclohexyl group, propylcyclohexyl group, butylcyclohexyl group, Examples include cycloalkyl groups which may have an alkyl group, such as a butylcyclohexyl group. Examples of the aryl group include a phenyl group, a naphthyl group, an anthracenyl group, a biphenyl group, and a phenyl group. Examples of the alkyl group include a phenyl group and a terphenyl group. Examples of the alkylaryl group include a tolyl group, a dimethylphenyl group, a butylphenyl group, and a phenylphenyl group. Examples of the alkyl group include a phenyl group, a nonylphenyl group, a methylbenzyl group, and a dimethylnaphthyl group. Examples of the arylalkyl group include a phenylmethyl group, a phenylethyl group, a diphenylmethyl group, and a phenylmethyl group. Examples thereof include a phenylmethyl group.

[0025] Among these, various properties (e.g., viscosity characteristics, pour point, flash point, rubber swelling resistance, etc.) From the viewpoint of obtaining a better lubricating base oil, R 1 and R 2 are respectively independently an alkyl or alkenyl group, R 1 and R 2 At least one of the following is branched Preferably, R is a branched alkyl group or a branched alkenyl group. 1 and R 2 are respectively Independently, an alkyl group, R 1 and R 2 At least one of the groups is a branched chain alkyl group. It is more preferable to do so.

[0026] In addition, in the lubricating base oil of one embodiment of the present invention, various properties (particularly viscosity characteristics, flash point, resistance From the viewpoint of obtaining a lubricating base oil having excellent rubber swelling properties, R 1 is carbon R is an alkyl or alkenyl group having a number of 8 or more; 2 is an alkyl group having 5 or more carbon atoms or R is an alkenyl group 1 and R 2 At least one of the above is a branched alkyl group or a branched alkoxy group. Preferably, R is an aryl group. 1 is an alkyl group having 8 or more carbon atoms, and R 2 is the number of carbon atoms 5 or more alkyl groups, 1 and R 2 At least one of the groups is a branched alkyl group. It is more preferable that In this embodiment, R 1 The carbon number is 8 or more, but it has a high flash point and is rubber-resistant. From the viewpoint of obtaining a lubricating base oil with improved swelling properties, the molecular weight is preferably 9 or more, and more preferably 10 or more. 10 or more, more preferably 11 or more, more preferably 12 or more, and even more preferably 13 or more , more preferably 14 or more, even more preferably 15 or more, and particularly preferably 16 or more. Also, 40 or less, 35 or less, 30 or less, 28 or less, 26 or less, 25 or less, 24 or less, It may be 23 or less, 22 or less, 21 or less, or 20 or less. In this embodiment, R 2 The carbon number of ethylenediamine is 5 or more, but it has high viscosity and high flash point. In addition, from the viewpoint of obtaining a lubricating base oil with improved resistance to rubber swelling, it is preferably 6 or more. , more preferably 7 or more, and even more preferably 8 or more, and is 30 or less, 25 or less, 2 2 or less, 20 or less, 18 or less, 16 or less, 15 or less, 14 or less, 13 or less, or 12 or less It may also be possible to use the following.

[0027] In one embodiment of the lubricating base oil of the present invention, in particular, the lubricating base oil has a lower pour point. From the above, R in the general formula (1) 1 and R 2are each independently a branched alkyl group or A branched chain alkenyl group is preferred, and a branched chain alkyl group is more preferred. .

[0028] [Properties of lubricating base oil] The kinematic viscosity at 40°C of the lubricating base oil of one embodiment of the present invention is 4.0 mm 2 / s or more, 4.2mm 2 / s or more, 4.5mm 2 / s or more, 4.7mm 2 / s or more, 5.0mm 2 / s or more, 5. 2mm 2 / s or more, 5.5mm 2 / s or more, 5.7mm 2 / s or more, 6.0mm 2 / s or later Top, 6.2mm 2 / s or more, 6.5mm 2 / s or more, 6.7mm 2 / s or more, 7.0mm 2 / s or more, 7.5mm 2 / s or more, 8.0mm 2 / s or more, 8.5mm 2 / s or more, 9 .0mm 2 / s or more, or 9.5 mm 2 / s or more, and 100 mm 2 / s Below, 90mm 2 / s or less, 80mm 2 / s or less, 70mm 2 / s or less, 60mm 2 / s Below, 50mm 2 / s or less, 40mm 2 / s or less, 35mm 2 / s or less, 30mm 2 / s Below, 25mm 2 / s or less, or 20 mm 2 / s or less may be used.

[0029] The kinematic viscosity at 100°C of the lubricating base oil of one embodiment of the present invention is 1.0 mm 2 / s or more, 1.2mm 2 / s or more, 1.5mm 2 / s or more, 1.7mm 2 / s or more, 2.0mm 2 / s or more, 2 .2mm 2 / s or more, 2.5mm 2 / s or more, 2.7mm 2 / s or more, or 3.0 mm 2 / s or more, and 10 mm 2 / s or less, 9.0mm 2 / s or less, 8.0mm 2 / s or less, 7.0mm 2 / s or less, 6.0mm 2 / s or less, 5.0mm 2 / s or less, 4 .5mm 2 / s or less, 4.2mm 2 / s or less, 4.0mm 2 / s or less, 3.8mm 2 / s Less than or equal to 3.5 mm 2 / s or less may be used.

[0030] The viscosity index of the lubricating base oil of one embodiment of the present invention is 70 or more, 80 or more, 85 or more, or 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 above, or 130 or above.

[0031] The pour point of the lubricating base oil of one embodiment of the present invention is adjusted to provide a lubricating oil composition that can be used over a wide temperature range. From the viewpoint of making the lubricating base oil easy to prepare, the temperature is preferably 0°C or lower, more preferably -5°C or lower. More preferably, it is -10°C or lower, even more preferably, it is -20°C or lower, and even more preferably, it is -25°C or lower. more preferably -30°C or less, even more preferably -35°C or less, particularly preferably is below -40°C. In this specification, the pour point means a value measured in accordance with JIS K2269. do.

[0032] The flash point of the lubricating base oil according to one embodiment of the present invention is preferably 170°C or higher, more preferably 1 74°C or higher, more preferably 180°C or higher, more preferably 184°C or higher, and even more preferably is 190°C or higher, more preferably 194°C or higher, even more preferably 200°C or higher, Preferably 204°C or higher, even more preferably 210°C or higher, even more preferably 214°C or higher ° C. or higher, particularly preferably 220 ° C. or higher, and also preferably 400 ° C. or lower, 380 ° C. or lower, 350 ° C. or lower The heating temperature may be 330°C or less, 320°C or less, 310°C or less, or 300°C or less. In this specification, the flash point is determined in accordance with JIS K2265-4 (Determination of flash point - Part 4) Measured by the Cleveland Open Method (COC method) in accordance with the Cleveland Open Method (Part: Cleveland Open Method) This means the value obtained.

[0033] A test acrylic rubber was immersed in the lubricating base oil according to one embodiment of the present invention, and the test The volume change rate of the test acrylic rubber measured under the conditions of 150 ° C for 72 hours in accordance with From the viewpoint of obtaining a lubricating base oil with good resistance to rubber swelling, it is preferably less than 20%. is 18% or less, more preferably 15% or less, even more preferably 13% or less, and even more preferably It is preferably 10% or less, even more preferably 8% or less, and particularly preferably 7% or less. In this specification, the volume change rate of the test acrylic rubber is determined by the method described in the examples. The values ​​are measured and calculated by the following method.

[0034] [Constitution of lubricating oil composition] A lubricating oil composition according to one embodiment of the present invention contains the lubricating base oil according to one embodiment of the present invention described above. The lubricating oil composition of one embodiment of the present invention may further contain lubricating oil additives, specifically In addition, pour point depressants, viscosity index improvers, antioxidants, extreme pressure agents, metallic detergents, ashless One or more lubricants selected from the group consisting of system dispersants, metal deactivators, friction modifiers, rust inhibitors, and antifoaming agents Lubricating oil additives may also be included. These lubricating oil additives may be used alone or in combination of two or more. stomach.

[0035] The content of each of these lubricating oil additives is within a range that does not impair the effects of the present invention. Although it can be appropriately adjusted, each of the components is based on the total amount (100 mass%) of the lubricating oil composition. The amount of each additive is usually 0.001 to 15 mass %, preferably 0.005 to 10 mass %. %, and more preferably 0.01 to 5 mass %.

[0036] In the lubricating oil composition of one embodiment of the present invention, the content of the lubricating base oil of one embodiment of the present invention is preferably 50% by mass or more, more preferably 50% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition. Preferably 60% by mass or more, more preferably 70% by mass or more, and even more preferably 80% by mass or more. % by mass or more, and particularly preferably 90% by mass or more.

[0037] [Pour point depressants] Examples of pour point depressants that can be used in one embodiment of the present invention include ethylene-vinyl acetate copolymers. Condensation products of chlorinated paraffins and naphthalene, Condensation products of chlorinated paraffins and phenol Examples of the polymerizable compound include polymethacrylates, polyalkylstyrenes, and the like. These pour point depressants may be used alone or in combination of two or more.

[0038] [Viscosity index improver] Examples of viscosity index improvers used in one embodiment of the present invention include non-dispersant polymethacrylates. acrylate, dispersed polymethacrylate, olefin copolymer (e.g., ethylene-propylene copolymer) copolymers), dispersion-type olefin copolymers, styrene copolymers (e.g., styrene- Examples of polymers include diene copolymers, styrene-isoprene copolymers, etc. These viscosity index improvers may be used alone or in combination of two or more. The viscosity index improver used in one embodiment of the present invention has a weight average molecular weight (Mw) of 5.00 0 or more, 7,000 or more, 10,000 or more, 15,000 or more, or 20,000 or more It may also be 1,000,000 or less, 700,000 or less, 500,000 or less Under, 300,000 or less, 200,000 or less, 100,000 or less, or 50,000 The following may also be used.

[0039] [Antioxidants] Examples of antioxidants used in one embodiment of the present invention include alkylated diphenylamines, Amine antioxidants such as phenylnaphthylamine and alkylated phenylnaphthylamine; 2,6-di-t-butylphenol, 4,4'-methylenebis(2,6-di-t-butyl) Phenol), Isooctyl-3-(3,5-di-t-butyl-4-hydroxyphenyl ) propionate, n-octadecyl-3-(3,5-di-t-butyl-4-hydroxy phenolic antioxidants such as phenyl)propionate; These antioxidants may be used alone or in combination of two or more. In the lubricating oil composition of one embodiment of the present invention, the antioxidant is an amine-based antioxidant and a phenol-based antioxidant. It is preferable to use a phenol-based antioxidant in combination.

[0040] [Extreme pressure agent (anti-wear agent)] Examples of extreme pressure agents (antiwear agents) used in one embodiment of the present invention include zinc dithiophosphate. Sulfur-containing compounds; phosphites, phosphates, phosphonates, and Phosphorus-containing compounds such as amine salts or metal salts thereof; thiophosphites, thiophosphates sulfur and thiophosphonates such as esters, thiophosphonates, and their amine salts or metal salts; Phosphorus-containing compounds These extreme pressure agents may be used alone or in combination of two or more.

[0041] [Metallic detergents] The metal-based detergent used in one embodiment of the present invention includes metal sulfonates, metal salicylates, and the like. and metal salts such as metal phenates. As the metal atom, a metal atom selected from alkali metals and alkaline earth metals is preferred, and sodium More preferred are zinc, calcium, magnesium, or barium, with calcium being even more preferred. stomach. These metallic detergents may be used alone or in combination of two or more.

[0042] In the lubricating oil composition of one embodiment of the present invention, the metal-based detergent is calcium sulfonate, It may contain one or more selected from calcium salicylate and calcium phenate. It is preferable to include calcium sulfonate. The calcium sulfonate content is determined based on the metal detergent content in the lubricating oil composition. Based on the total amount (100% by mass), the amount is preferably 50 to 100% by mass, more preferably 60 to 1 00 mass%, more preferably 70 to 100 mass%, and even more preferably 80 to 100 mass% %.

[0043] The base number of the metallic detergent is preferably 0 to 600 mgKOH / g. However, in the lubricating oil composition of one embodiment of the present invention, the metallic detergent has a base number of 100m Preferably, the detergent is an overbased metallic detergent with an acidity of gKOH / g or more. The base number of the overbased metallic detergent is preferably 100 mgKOH / g or more. Preferably, it is 150 to 500 mg KOH / g, more preferably 200 to 450 mg KOH / g. do. In this specification, the "base number" refers to the base number of petroleum products as defined in JIS K2501:2003 and the base number measured by the perchloric acid method in accordance with 7. of "Lubricating Oils - Neutralization Number Test Method" means.

[0044] [Ashless dispersant] The ashless dispersant used in one embodiment of the present invention is, for example, a boron-free alkenyl dispersant. boron-free succinimides such as succinimides, boron-containing alkenyl succinimides, etc. boron-containing succinimides, benzylamines, boron-containing benzylamines, succinimides esters of succinic acid, fatty acids or mono- or dicarboxylic acid amides represented by succinic acid etc. These ashless dispersants may be used alone or in combination of two or more.

[0045] [Metal deactivator] The metal deactivator used in one embodiment of the present invention is, for example, a benzotriazole-based compound. compounds, tolyltriazole compounds, imidazole compounds, pyrimidine compounds, etc. can be done. These metal deactivators may be used alone or in combination of two or more.

[0046] [Friction modifier] Examples of the friction modifier used in one embodiment of the present invention include molybdenum dithiocarbamate. (MoDTC), molybdenum dithiophosphate (MoDTP), amine salts of molybdic acid, etc. Molybdenum friction modifiers: Contains a small number of alkyl or alkenyl groups with 6 to 30 carbon atoms in the molecule. At least one fatty amine, fatty acid ester, fatty acid amide, fatty acid, fatty alcohol Ashless friction modifiers such as coal and aliphatic ethers; oils and fats, amines, amides, sulfurized esters, etc. Examples include: These friction modifiers may be used alone or in combination of two or more.

[0047] [Rust inhibitor] Examples of the rust inhibitor used in one embodiment of the present invention include fatty acids, half alkenyl succinates, Esters, fatty acid soaps, alkyl sulfonates, polyhydric alcohol fatty acid esters, fats Examples include fatty acid amines, oxidized paraffins, and alkyl polyoxyethylene ethers. These rust inhibitors may be used alone or in combination of two or more.

[0048] [Antifoaming agent] Examples of the antifoaming agent used in one embodiment of the present invention include silicone oil and fluorosilicone. oil and fluoroalkyl ether. These antifoaming agents may be used alone or in combination of two or more.

[0049] [Properties and characteristics of lubricating oil composition] The lubricating oil composition of one embodiment of the present invention contains a lubricating base oil having a natural origin index of 100%. Therefore, the lubricating oil composition can have a reduced impact on the environment when disposed of. The lubricating oil composition of one embodiment of the present invention contains a lubricating oil additive, and thus is free from naturally occurring The index may be less than 100%. However, from the viewpoint of providing a lubricating oil composition that reduces the environmental impact when disposed of, The natural origin index of the lubricating oil composition of one embodiment of the present invention is preferably 80% or more, more preferably 85% or more, more preferably 90% or more, even more preferably 95% or more, particularly preferably is over 97%.

[0050] The kinematic viscosity at 40°C of the lubricating oil composition of one embodiment of the present invention is adjusted appropriately depending on the application, and is 4.0 mm 2 / s or more, 4.2mm 2 / s or more, 4.5mm 2 / s or more, 5.0mm 2 / s or more , 5.2mm 2 / s or more, 5.5mm 2 / s or more, 6.0mm 2 / s or more, 6.2mm 2 / s or more, 6.5mm 2 / s or more, 7.0mm 2 / s or more, 7.5mm 2 / s or more, 8. 0mm 2 / s or more, 8.5mm 2 / s or more, 9.0mm 2 / s or more, 9.5mm 2 / s or later Top, or 10.0 mm 2 / s or more, and 100 mm 2 / s or less, 90mm 2 / s or less, 80mm 2 / s or less, 70mm 2 / s or less, 60mm 2 / s or less, 50mm 2 / s or less, 40mm 2 / s or less, 35mm 2 / s or less, 30mm 2 / s or less, 25mm 2 / s or less, or 20 mm 2 / s or less may be used.

[0051] The kinematic viscosity at 100°C of the lubricating oil composition of one embodiment of the present invention is adjusted appropriately depending on the application, and is 1. 0mm 2 / s or more, 1.5mm 2 / s or more, 2.0mm 2 / s or more, 2.2mm 2 / s or later Top, 2.5mm 2 / s or more, 2.7mm 2 / s or more, or 3.0 mm 2 / s or more Well, also 10mm 2 / s or less, 9.0mm 2 / s or less, 8.0mm 2 / s or less, 7. 0mm 2 / s or less, 6.0mm 2 / s or less, 5.0mm 2 / s or less, 4.5mm 2 / s or later Bottom, 4.2mm 2 / s or less, 4.0mm 2 / s or less, 3.8mm 2 / s or less, or 3.5 mm 2 / s or less may be used.

[0052] The viscosity index of the lubricating oil composition of one embodiment of the present invention is 70 or more, 80 or more, 85 or more, 90 or more. Above, 95 or above, 100 or above, 105 or above, 110 or above, 115 or above, 120 or above, 125 It may be 130 or more.

[0053] The pour point of the lubricating oil composition according to one embodiment of the present invention is preferably 0°C or lower, more preferably -5°C or lower. ° C. or less, more preferably -10° C. or less, even more preferably -20° C. or less, even more preferably - 25°C or less, even more preferably -30°C or less, even more preferably -35°C or less, particularly Preferably, the temperature is -40°C or lower.

[0054] The flash point of the lubricating oil composition according to one embodiment of the present invention is preferably 170°C or higher, more preferably 174°C or higher, more preferably 180°C or higher, more preferably 184°C or higher, and even more preferably Preferably, the temperature is 190°C or higher, more preferably 194°C or higher, even more preferably 200°C or higher, and even more preferably 194°C or higher. Preferably, the temperature is 204°C or higher, more preferably 210°C or higher, and even more preferably 21 4°C or higher, particularly preferably 220°C or higher, and also 400°C or lower, 380°C or lower, 350°C or lower The temperature may be 330°C or less, 320°C or less, 310°C or less, or 300°C or less.

[0055] A test acrylic rubber was immersed in the lubricating oil composition according to one embodiment of the present invention, and the test was carried out according to JIS K6258 The volume change rate of the test acrylic rubber measured under the conditions of 150°C for 72 hours in accordance with , preferably less than 20%, more preferably 18% or less, more preferably 15% or less, Preferably, it is 13% or less, more preferably 10% or less, even more preferably 8% or less, particularly Preferably, it is 7% or less.

[0056] The lubricating oil composition of one embodiment of the present invention was tested at room temperature (24°C) according to JIS K2518. When foaming tests were conducted under the conditions of the specified sequences I, II, and III, The foam volume immediately after application and after 10 minutes is preferably 5 mL or less, more preferably 5 mL or less. Preferably 3 mL or less, more preferably 1 mL or less, and even more preferably 0 mL (if bubbles are observed) (Not available). The foam volume value means the value measured by carrying out a foaming test described in the Examples below. Taste.

[0057] The lubricating oil composition of one embodiment of the present invention was subjected to a test at 100°C for 3 hours in accordance with JIS K2513. JIS K2513 indicates the degree of discoloration of the copper plate after a 2-hour copper plate corrosion test. The discoloration number based on the description in "Table 1: Classification of corrosion according to the copper plate corrosion standard" is preferably 2c or more. More preferably, 2b or less, even more preferably, 2a or less, and even more preferably, 1b or less. be. The discoloration number is determined by carrying out a copper plate corrosion test as described in the examples below, according to JIS K251 This refers to the value specified based on "Table 1: Classification of corrosion according to the copper plate corrosion standard" in 3.

[0058] The lubricating oil composition of one embodiment of the present invention was subjected to dielectric breakdown voltage testing in accordance with JIS C2101. A voltage test is carried out, and the voltage at which breakdown occurs and insulation is lost is preferably 50 kV or more. More preferably, 60 kV or more, even more preferably, 70 kV or more, and even more preferably, 80 kV or more V or more, and particularly preferably 85 kV or more. The voltage value is the value measured by carrying out the breakdown voltage test described in the examples below. means.

[0059] Using the lubricating oil composition of one embodiment of the present invention, a test temperature of 8°C was carried out in accordance with ASTM D4172. Shell wear under test conditions of 0°C, load 392N, rotation speed 1800 rpm, test time 30 minutes The wear scar diameter when tested is preferably 1.00 mm or less, more preferably 0.90 mm or less. m or less, more preferably 0.80 mm or less, even more preferably 0.70 mm or less, It is preferably 0.60 mm or less, and particularly preferably 0.50 mm or less. The wear scar diameter is a value measured by carrying out a shell wear test described in the Examples below. means.

[0060] [Uses of lubricating oil composition] The lubricating oil composition of a preferred embodiment of the present invention has reduced environmental impact upon disposal. Although it is a lubricating oil composition, it has excellent lubricating properties. Taking these characteristics into consideration, the lubricating oil composition of one embodiment of the present invention is suitable for use in, for example, electric drive units. These are incorporated into various devices such as engines, transmissions, reducers, compressors, and hydraulic systems. For mechanisms such as oil converters, wet clutches, gear bearing mechanisms, oil pumps, and hydraulic control mechanisms It can be used suitably for lubrication in the following cases. It also has excellent cooling and insulating properties. It can also be suitably used for cooling and insulating motors and batteries. [Example]

[0061] Next, the present invention will be described in more detail with reference to examples. The methods for measuring or calculating various properties are as follows, but are not limited to these.

[0062] (1)Natural origin index Calculated in accordance with ISO 16128. (2)Kinematic viscosity, viscosity index Measurements and calculations were made in accordance with JIS K2283:2000. (3) Pour point Measurement was carried out in accordance with JIS K2269. (4) Flash point Compliant with JIS K2265-4 (How to determine flash point - Part 4: Cleveland open method) The measurements were carried out using the Cleveland open cell count (COC) method. (5) Volume change rate of acrylic rubber A rubber immersion test was conducted in accordance with JIS K6258. Test acrylic rubber (manufactured by NOK Corporation, product name "T303") was immersed in lubricating base oil at The test was carried out under the conditions of 150°C and 72 hours of immersion. The volume of the piece was measured, and the volume change rate was calculated using the following formula. ·[Volume change rate (%)] = ([Volume of test piece after test] - [Volume of test piece before test]) / [Volume of test piece before test] x 100

[0063] (Lubricant base oil) Examples 1 to 4, Comparative Examples 1 to 3 The ester compounds synthesized from the carboxylic acid components and alcohol components shown in Table 1 were used as lubricants. The base oils (1) to (7) are used to calculate the natural origin index, and the lubricating base oil is obtained. Various properties were measured according to the above methods, and the results are shown in Table 1.

[0064] Reference examples 1~2 In Reference Example 1, 60N mineral oil was used as the lubricating base oil (8), and in Reference Example 2, 100N mineral oil was used as the lubricating base oil (9). As a base oil (9), the natural origin index is calculated and various physical properties are measured in accordance with the above methods. The results are shown in Table 1.

[0065] [Table 1]

[0066] As shown in Table 1, the lubricating base oils (1) to (4) of Examples 1 to 4 have a natural origin index of This means that the lubricant base oil has a reduced environmental impact upon disposal. In addition, the lubricating base oils (1) to (4) were similar to the lubricating base oils (8) to (9) in Reference Examples 1 and 2. It was confirmed that the properties of On the other hand, the lubricating base oils (5) to (7) of Comparative Examples 1 to 3 have low environmental impact when disposed of. Furthermore, the lubricating base oils (6) to (7) are of concern. However, the volume change rate of the acrylic rubber is 20% or more, and there is a problem with the resistance to rubber swelling.

[0067] (Lubricating oil composition) Example 5, Reference Example 3 In Example 5, the lubricating base oil (1) of Example 1 and the various additives were used in the amounts shown in Table 2. The lubricating oil compositions were prepared by adding the ingredients as follows: In Reference Example 3, the lubricating base oil (8) of Reference Example 1 was 60N mineral oil, and the lubricating base oil (9) of Reference Example 2 was 60N mineral oil. The contents of 100N mineral oil (9), pour point depressant, and various additives were adjusted to the amounts shown in Table 2. to prepare a lubricating oil composition. The components used in preparing these lubricating oil compositions are as follows: Lubricating base oil (1): Isostearyl acrylate, which is the lubricating base oil (1) of Example 1 shown in Table 1 Methylheptyl phosphate. Lubricating base oil (8): 60N mineral oil, which is the lubricating base oil (8) of Reference Example 1 shown in Table 1. Lubricating base oil (9): 100N mineral oil, which is the lubricating base oil (8) of Reference Example 1 shown in Table 1 . · Pour point depressant: Polymethacrylate (PMA) based pour point depressant. Various additives: phosphite ester, thiadiazole, calcium sulfonate (base number: 300mgKOH / g), polybutenyl succinimide, benzotriazole, and silicon An additive mixture consisting of a corn-based antifoam agent.

[0068] The prepared lubricating oil compositions were measured for various properties by the methods described above, and the following (1 The results of the tests ) to (4) are shown in Table 2.

[0069] (1) Foaming test The lubricating oil composition to be measured was measured at room temperature (24°C) according to JIS K2518. The foaming test was carried out under the conditions of sequences I, II, and III, and the results were obtained immediately after the start of the test and The volume of foam after 10 minutes was measured. The smaller the foam volume, the better the lubricating oil composition's antifoaming properties. It can be said that there is.

[0070] (2) Copper plate corrosion test In accordance with JIS K2513, a copper plate corrosion test was conducted at 100°C for 3 hours. The degree of discoloration is measured according to the description in "Table 1: Classification of corrosion according to the copper plate corrosion standard" of JIS K2513. The smaller the discoloration number, the better the corrosion resistance of the lubricating oil composition. It can be said to be a thing.

[0071] (3) Breakdown voltage test In accordance with JIS C2101, a breakdown voltage test is carried out to determine whether breakdown occurs and the insulation is intact. The voltage (unit: kV) at the time of failure was measured. The higher the voltage value, the better the insulation. It can be said to be a lubricating oil composition.

[0072] (4) Shell abrasion test Test temperature: 80°C, load: 392N, rotation speed: 1800r, in accordance with ASTM D4172 The wear scar diameter (unit: mm) was measured under the test conditions of pm and test time 30 minutes. The smaller the wear scar diameter, the more excellent the metal-to-metal wear resistance of the lubricating oil composition.

[0073] [Table 2]

[0074] As shown in Table 2, the lubricating oil composition prepared in Example 5 had a natural origin index of 98%. Therefore, it can be said that this lubricating oil composition has a reduced impact on the environment when it is disposed of. The lubricating oil composition of Example 5, like the lubricating oil composition of Reference Example 1, is a general lubricating oil composition. It was confirmed that the product has various excellent lubricating properties required for the

Claims

1. The natural origin index (ISO 16128) is 100%, A lubricating oil base comprising a monoester compound having one or more branched chain structures and having 18 or more carbon atoms. oil.

2. The monoester compound according to claim 1, wherein the monoester compound is a compound represented by the following general formula (1): Lubricating base oil. 【Chemistry 1】 (In the above formula, R １ and R ２ are each independently a hydrocarbon group, and R １ and R ２ of At least one of them is a branched chain hydrocarbon group. １ and R ２ The total number of carbon atoms is 17 or more. Above.)

3. R in the general formula (1) １ is an alkyl or alkenyl group having 8 or more carbon atoms, and R ２ is an alkyl or alkenyl group having 5 or more carbon atoms, and R １ and R ２ At least one of 3. The lubricating base oil of claim 2, wherein is a branched chain alkyl group or a branched chain alkenyl group.

4. R in the general formula (1) １ and R ２ are each independently a branched alkyl group or a branched 4. The lubricating base oil of claim 2, wherein the alkyl group is a straight chain alkenyl group.

5. The lubricant according to any one of claims 1 to 4, wherein the pour point of the lubricant base oil is 0°C or lower. Lubricant base oil.

6. The test acrylic rubber was immersed in the lubricating base oil for 15 minutes in accordance with JIS K6258. The volume change rate of the test acrylic rubber measured under the condition of 0°C for 72 hours is less than 20% The lubricating base oil according to any one of claims 1 to 5.

7. A lubricating oil composition comprising the lubricating base oil of any one of claims 1 to 6.

8. In addition, pour point depressants, viscosity index improvers, antioxidants, extreme pressure agents, metal detergents, ashless One or more lubricants selected from dispersants, metal deactivators, friction modifiers, rust inhibitors, and antifoaming agents The lubricating oil composition of claim 7, containing an oil additive.

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