WO2003078555A1

WO2003078555A1 - Lubricating oil composition and process for producing the same

Info

Publication number: WO2003078555A1
Application number: PCT/JP2003/002740
Authority: WO
Inventors: Takahiro Kudo
Original assignee: Cosmo Oil Lubricants Co., Ltd.
Priority date: 2002-03-18
Filing date: 2003-03-07
Publication date: 2003-09-25
Also published as: AU2003221333A1; JP2004161976A

Abstract

A lubricating oil composition characterized by comprising a base oil and, dispersed or dissolved therein, an inorganic acid which is solid at ordinary temperature.

Description

Description Lubricating oil composition and method for producing the same

Technical field

The present invention relates to a lubricating oil composition and a method for producing the same, and more particularly, to a lubricating oil composition having excellent wear resistance and maintaining a low coefficient of friction for a long time, and a method for producing the same. The present invention relates to a lubricating oil composition capable of maintaining excellent wear resistance, heat resistance and a low coefficient of friction as a bearing oil, and a method for producing the same. Background art

Conventionally, to improve the lubrication characteristics of the parts where friction and wear occur, for example, Zn DTP

(Zinc dithiophosphate) and anti-pressure additives such as polysulfidyl phosphates, as well as Mo DTP (molybdenum diphosphate) and Mo DTC (molybdenum dicarbophosphate). Friction modifiers such as mate) are often used. Also, in particular, carbon steel, nickel chrome steel, -money chrome molybdenum II, manganese copper, manganese copper, anore minimum copper molybdenum steel, high carbon chromium steel, stainless steel, etc., or copper, brass, Bearing materials made of bronze, copper bronze, high-strength brass, aluminum bronze, lead bronze, phosphorous copper, magnesium copper, beryllium copper, etc., and various sintered materials such as pure iron, iron-copper, iron Monocarbon, iron-carbon-copper, iron-carbon-copper-nickel, iron-carbon (copper infiltration), iron-nickel, iron-carbon-nickel, austenitic stainless steel, martensite The above antiwear agents, extreme pressure additives, and friction modifiers are also used in lubricating oils such as sintered bearing materials made of stainless steel, bronze, and the like. Disclosure of the invention

However, in recent years, various devices requiring lubricating oil have been downsized and have high output. Operating conditions have become severer due to higher efficiency, and at the same time, the environment for lubricating oils has become more severe. Among them, the lubricating oil for motors used in AV equipment such as CD-R and DVD-R is especially lubricating due to increased friction and wear caused by reduced rotational accuracy due to high-speed rotation and increased environmental temperature. It is used under severe environmental conditions for oil. Therefore, lubricating oils must also have low friction coefficient, excellent wear resistance, and heat resistance such as suppressing the generation of sludge due to heat. Can be

The present invention has been made in view of the state of the prior art described above, and has excellent wear resistance, maintains a low coefficient of friction for a long period of time, and has heat resistance. An object of the present invention is to provide a bearing oil composition.

The present inventor has conducted intensive studies to solve the above-mentioned problems, and found that mineral oil or synthetic oil is used as a base oil, and a solid inorganic acid is dispersed or dissolved at room temperature in the base oil, thereby obtaining abrasion resistance. They have found that they have excellent heat resistance and realize a low coefficient of friction for a long period of time, and have completed the present invention based on this finding.

That is, the present invention provides a lubricating oil composition characterized in that an inorganic acid that is solid at room temperature is dispersed or dissolved in a base oil.

The present invention also provides a lubricating oil composition wherein the inorganic acid in the lubricating oil composition is a phosphorus-based inorganic acid or a boron-based inorganic acid.

Further, the present invention provides the lubricating oil composition, wherein the phosphorus-based inorganic acid comprises phosphorous acid, hypophosphorous acid, pyrophosphoric acid, pyrophosphoric acid, polyphosphoric acid, metaphosphoric acid, phosphoric acid, and salts thereof. And at least one lubricating oil composition selected from the group consisting of: Further, the boron-based inorganic acid provides a lubricating oil composition which is at least one selected from boric acid, boric acid and salts thereof.

The present invention also provides a lubricating oil composition wherein the content of each inorganic acid component in the lubricating oil composition is 0.001 to 5% by mass.

Further, the present invention provides the lubricating oil composition according to the present invention, wherein the compound having both a non-polar group and a polar group, and a non-polar group dissolved in the base oil and having a weak bond-forming ability with an inorganic acid. A lubricating oil composition comprising at least one compound selected from the group consisting of:

Further, the present invention provides the lubricating oil composition, wherein the compound having a nonpolar group dissolved in the base oil and having the ability to form a weak bond with an inorganic acid comprises a monohydric saturated alcohol, a monohydric unsaturated alcohol and (4) To provide a lubricating oil composition of at least one kind selected from polyhydric alcohols.

Further, the present invention provides the lubricating oil composition, wherein the monohydric saturated alcohol is 0.05 to 20% by mass, the monounsaturated alcohol is 0.05 to 40% by mass, and the polyhydric alcohol is 0.05 to 20% by mass. An object of the present invention is to provide a lubricating oil composition containing the lubricating oil composition in a content of from 0.5 to 40% by mass. Further, the present invention provides at least one compound selected from a compound having both a non-polar group and a polar group, and a compound having a non-polar group dissolved in a base oil and having an ability to form a weak bond with an inorganic acid. It is intended to provide a lubricating oil composition characterized by containing a reaction intermediate between a seed and an inorganic acid.

Further, the present invention provides a lubricating oil composition comprising a reaction intermediate of at least one selected from monohydric saturated alcohols, monounsaturated alcohols and polyhydric alcohols with an inorganic acid. Is what you do.

The present invention also provides a lubricating oil composition containing the above-mentioned lubricating oil composition, which contains an antiwear agent or a friction modifier.

Further, the present invention provides the lubricating oil composition, wherein the antiwear agent or the friction modifier comprises a phosphate ester, a phosphite ester, an acid phosphate ester, an acid phosphate ester amine salt, thiophosphite, or thiophosphite. A lubricating oil composition that is at least one selected from the group consisting of sulfide, polysulfide, polysulfide, Zn dithiophosphate, Mo dithiophosphate, Mo dithiocarbamate, and (poly) glyceryl ether. is there.

Further, the present invention provides a lubricating oil composition according to the above lubricating oil composition, wherein the content of the antiwear agent or the friction modifier is 0.01 to 5% by mass for each antiwear agent or friction modifier. It provides things. The present invention also provides a lubricating oil composition containing the above-mentioned lubricating oil composition, which contains an antioxidant.

Further, the present invention provides the lubricating oil composition, wherein the antioxidant is at least one selected from alkylated diphenylamine, alkylated phenyl-naphthylamine and hindered phenol. To provide.

Further, in the above lubricating oil composition, the alkylated Jifueniruamin 0s. 0 5-2 mass ^_0/0, alkylated phenylene Lou one Nafuchiruamin 0.0 5 to 2 wt%, Hindadofu Roh Ichiru acids The present invention provides a lubricating oil composition containing 0.05 to 2% by mass.

Further, the present invention provides a lubricating oil composition comprising the above lubricating oil composition, which comprises a metal deactivator and a deterrent.

Further, the present invention provides the above lubricating oil and composition, wherein the metal deactivator and the deterrent are at least one selected from benzotriazole and its derivatives and alkylsuccinic acid derivatives. To provide.

Further, the present invention provides the above lubricating oil composition, wherein the benzotriazole and its derivative are 0.01 to 0.05% by mass, and the alkyl succinic acid derivative is 0.01 to 0.3 mass. / ₀ is provided.

Further, the present invention provides a lubricating oil composition comprising: heating a base inorganic oil to a temperature at which a solid inorganic acid can be dispersed or dissolved at room temperature; and dispersing or dissolving the inorganic acid in the base oil. It is intended to provide a method of manufacturing a product.

In addition, the present invention relates to a method in which an inorganic acid which is solid at room temperature in a base oil, a compound having both a non-polar group and a polar group, and a non-polar group which has a non-polar group dissolved in a base oil and has a weak acidity. A lubricating oil composition characterized in that at least one compound selected from compounds having bond forming ability is heated to a temperature at which the reaction intermediate can be formed, and the reaction intermediate is dissolved in a base oil. It is intended to provide a manufacturing method.

The present invention also provides the method for producing a lubricating oil composition, wherein the compound having an apolar group dissolved in a base oil and having a weak bond-forming ability with an inorganic acid is a monohydric saturated alcohol, An object of the present invention is to provide a method for producing a lubricating oil composition which is at least one selected from a monounsaturated alcohol and a polyhydric alcohol.

Further, the present invention provides a method of mixing an inorganic acid which is solid at ordinary temperature and at least one kind of compound having a nonpolar group dissolved in a base oil and having a weak bond-forming ability with an inorganic acid, A method for producing a lubricating oil composition, characterized in that a reaction intermediate is generated by heating to a temperature at which a reaction intermediate can be generated, and then the reaction intermediate is mixed and dissolved in a base oil. Is what you do.

Further, the present invention provides the method for producing a lubricating oil, wherein the compound having a nonpolar group dissolved in the base oil and having the ability to form a weak bond with an inorganic acid is a polyalkylene glycol, a polyphenyl ether or a polyphenyl ether. At least one selected from partial esters of polyhydric alcohols

An object of the present invention is to provide a method for producing one type of lubricating oil composition.

BEST MODE FOR CARRYING OUT THE INVENTION

Mineral oil and synthetic oil are used as the base oil used in the lubricating oil composition of the present invention. The type of mineral oil or synthetic oil is not particularly limited, but the kinematic viscosity at 40 ° C according to the JISK2283 kinematic viscosity test method is 3 to 500 mm ² ZS, preferably 4 to 25 O. mm ² ZS, more preferably 5 to 15 O mm VS, particularly preferably 6 to 100 mm ² / S.

When the kinematic viscosity at 40 ° C is 3 mm ² / S or more, an appropriate oil film is obtained, which is preferable.When the kinematic viscosity is 50 O mm ² / S or less, the resistance torque when the shaft rotates becomes appropriate. Preferred.

Examples of the mineral oil include paraffinic mineral oil, naphthenic mineral oil, and intermediate mineral oil obtained by refining such as solvent refining and hydrorefining.

Examples of the types of synthetic oils include ester oils such as hydrocarbon synthetic oils, monoesters, diesters, polyol esters, polyglycol esters, glycerin esters, and aromatic esters, and ether oils such as alkylated polyphenyl ethers. And various silicone oils and various fluorine oils. Examples of the hydrocarbon-based synthetic oil include poly-α-olefin, polybutene, and ethylene- _α -olefin oligomer.

Examples of monoesters include capric prillic acid, capric acid, lauric acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, oleic acid, ricinoleic acid, linoleic acid, linolenic acid, arachidonic acid, icosapentaenoic acid, and erucic acid. Acid, docosahexaenoic acid, lignoceric acid, etc. and at least one of carboxylic acids such as methanol, ethanol, prano, "nonole, butano-nore, pentanole, hexanonole, heptano-nore, o-octanol, nonanol, decanol, Monoesters obtained from one or more monohydric alcohols such as pendecanol, dodecanol, tridecanol, tetradecanol, and pentadecanol are exemplified.

Diestenoles include malonic acid, methinolemalonic acid, succinic acid, methylsuccinic acid, dimethylmalonic acid, ethylmalonic acid, glutanic acid, adipic acid, dimethylsuccinic acid, pimelic acid, tetramethylsuccinic acid, suberic acid, azeleic acid, sebacic acid, One or more carboxylic acids, such as brasilic acid, and methanol, ethanol, propanol, butanol, pentanole, hexanolnole, heptanonole, cinnachonole, nonanol, decanol, pendecanol, dodecanol, tridecanol, tetradecanol Diesel obtained from one or more monohydric alcohols such as knol and pentadecanol.

Examples of the polyol ester include one or more polyols such as trimethylonoleethane, trimethylolpropane, and pentaerythritol, as well as hydracrylic acid, hydrauric acid, lauric acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, Examples thereof include polyol esters obtained from one or more carboxylic acids such as oleic acid, ricinoleic acid, linoleic acid, linolenic acid, arachidonic acid, icosapentaenoic acid, eric acid, docosahexanoic acid, and lignoceric acid.

Examples of polydalichol esters include one or more of polydalichol, and prillic acid, prillic acid, lauric acid, myristic acid, palmitic acid, normithreic acid, stearic acid, oleic acid, ricinoleic acid, linoleic acid, and linolenic acid , Arachidonic acid, Examples include polyglycol esters obtained from one or more carboxylic acids such as osapentaenoic acid, erucic acid, docosahexanoic acid, and lignoceric acid.

Examples of glycerin esters include glycerin monofatty acid ester, glycerin difatty acid ester, and glycerin trifatty acid ester. One or more of stearic acid, oleic acid, ricinoleic acid, linolenic acid, linolenic acid, arachidonic acid, icosapentaenoic acid, eric acid, docosahexaenoic acid, and lignoceric acid.

Examples of the polyphenylene ether include polyphenyl ethers such as diphenylene ethere, triphenylenoleatene, and tetraphenylene etheretone, alkylene triphenyl ether, alkylated triphenyl ether, alkylated tetraphenyl ether, and the like. Polyphenyl ether and the like.

The phenyl group may be substituted with one or more linear or branched alkyl groups. Specific examples of the alkyl group include, for example, methyl, ethyl, n-propyl, isopropynole, n-butynole, isoptinole, tert-butyl, n-pentyl, isopentinole, neopentynole, tert-pentynole, 2-methylbutyl, n-hexyl , Isohexinole, 3-Methylpentinole, Etinolebutinole, n-Heptinole, 2-Methylhexinole, n-octinole, 2-Ethylhexyl, 3-Methinoleheptinole, n-Noel, Methinole Cutinole, Etchinolepeptinole , N-decinole, n-decinole, n-dodecinole, n-tetradecyl and the like.

The above base oils may be used alone or in a combination of two or more, and may be used in combination with a mineral oil and a synthetic oil.

The lubricating oil composition of the present invention has a solid inorganic acid dispersed or dissolved at room temperature.

One or more inorganic acids which are solid at room temperature can be used in combination.

The inorganic acid that is solid at room temperature may be in the form of a salt. Examples of the metal constituting the salt include various metals, for example, an alkali metal, an alkaline earth metal, and a transition metal. As the inorganic acid which is solid at room temperature, a phosphorus-based inorganic acid, a boron-based inorganic acid and the like are preferably exemplified.

As the phosphorus-based inorganic acid, phosphorous acid, hypophosphorous acid, pyrophosphoric acid, pyrophosphorous acid, polyphosphoric acid, metaphosphoric acid, phosphoric acid, and salts thereof are preferable.

Phosphorous acid has HP = 0 (OH) ₂ but may be in the form of a salt. Hypophosphorous acid is H ₂ P = O (OH), but may be in the form of a salt. Pyrophosphate may be in the form of a salt wherein (HO) ₂ P = 0−0−P = 0 (OH) ₂ . Pyrophosphorous acid has the formula (HO) HP = 0-O-PH = 0 (OH), but may be in the form of a salt. Polyphosphoric acid has the formula (HO) ₂ P = 0— (0-P = 0 (OH)) _n -P = 0 (OH) ₂ , where n is preferably 1 to 100, and in the form of a salt. There may be. Metaphosphoric acid is (HPO ₃ ) _n , where n is preferably 1 to 100, and may be in the form of a salt. Phosphoric acid has (HO) ₃ P = 〇, but may be in the form of a salt.

Examples of the boron-based inorganic acid include boric acid and boric acid.

Boric acid is B_ (OH) ₃ , but may be in the form of a salt, an aggregate, or a salt of the aggregate. The borax is HB— (OH) ₂ , but may be in the form of a salt, an aggregate, or a salt of the aggregate. The content ratio of the inorganic acid component is such that each inorganic acid component is preferably 0.001 to 5% by mass, more preferably 0.01 to 3% by mass, still more preferably 0.05 to 2% by mass, and particularly preferably 0.1 to 5% by mass. : I. 5% by mass.

A content of 0.001% by mass or more is preferable because sufficient extreme pressure performance and a low friction coefficient can be easily achieved. Also, when the content is 5% by mass or less, the effect is not saturated, and an effect commensurate with the added amount is obtained, so that it is preferable.

As a method for dispersing or dissolving a solid inorganic acid at room temperature in a base oil, for example, mixing a solid inorganic acid at room temperature with a base oil, and adjusting the mixture to a temperature at which the inorganic acid can be dispersed or dissolved. A method of dispersing or dissolving by heating and stirring as necessary, heating the base oil to a temperature at which the inorganic acid can be dispersed or dissolved in advance, and then mixing the solid inorganic acid at room temperature and stirring if necessary By dispersing or dissolving And so on.

Inorganic acids that are solid at room temperature are mixed with the base oil in various forms such as powders and lumps. When the inorganic acid which is solid at room temperature is mixed with the base oil in the form of powder or bulk, the temperature at which the inorganic acid can be dispersed or dissolved is a temperature higher than the temperature 60 ° C lower than the melting point of the inorganic acid. It is more preferable that the temperature is higher than the temperature of 50 ° C lower than the melting point of the inorganic acid, and it is even more preferable that the temperature is higher than the temperature of 40 ° C lower than the melting point of the inorganic acid. It is particularly preferable that the temperature is higher than the temperature lower by 30 ° C. than the melting point of The upper limit of the temperature around the melting point of the inorganic acid is not particularly limited, but from the viewpoint of heating energy efficiency, the temperature is preferably 30 ° C higher than the melting point of the inorganic acid, and 20 ° C higher than the melting point of the inorganic acid. The temperature is more preferably not higher than the temperature, particularly preferably not higher than 10 ° C higher than the melting point of the inorganic acid.

When the inorganic acid that is solid at room temperature has deliquescent properties, the inorganic acid that is solid at room temperature can be mixed with the base oil in the form of an aqueous solution. The concentration of the aqueous solution of the inorganic acid is not particularly limited, but is preferably 95% by mass / ₀ or less, particularly preferably 80% by mass or less.

The heating temperature when the inorganic acid is mixed with the base oil in the form of an aqueous solution is preferably at least 80 ° C, more preferably at least 90 ° C, particularly preferably at least 95 ° C. The upper limit of the heating temperature is preferably 120 ° C. or lower from the viewpoint of energy efficiency.

However, when the inorganic acid that is solid at room temperature is boric acid, boric acid or a salt thereof, the heating temperature when the inorganic acid is mixed with the base oil in the form of an aqueous solution should be at least 160 ° C. Preferably, it is 170 ° C. or higher, more preferably, 180 ° C. or higher. The upper limit of the heating temperature is preferably 200 ° C. or less from the viewpoint of energy efficiency.

It is preferable that the mixture of the base oil and the inorganic acid that is solid at room temperature is stirred during heating.

The lubricating oil composition of the present invention is selected from a compound having both a non-polar group and a polar group, and a compound having a non-polar group dissolved in a base oil and having a weak bond-forming ability with an inorganic acid. It is desirable to contain at least one kind, preferably at least one kind selected from a monohydric saturated alcohol, a monounsaturated alcohol, a polyhydric alcohol, and a polyether. Here, the ability to form a weak bond with an inorganic acid refers to a strong bond such as a covalent bond. The ability to form a weak bond, such as a hydrogen bond, an intermolecular attraction, or an electrical attraction, to an inorganic acid, rather than a strong bond.

The content ratio of at least one selected from a compound having both a nonpolar group and a polar group and a compound having a nonpolar group dissolved in a base oil and having a weak bond-forming ability with an inorganic acid is 0. It is 0.5 to 40% by mass, preferably 0.1 to 30% by mass, more preferably 0.5 to 20% by mass, and particularly preferably 1 to 15% by mass.

When the content is 0.05% by mass or more, it is easy to realize a sufficiently low friction coefficient, which is preferable. Further, when the content is 40% by mass or less, the effect is not saturated, and an effect commensurate with the added amount is obtained, so that it is preferable.

The monohydric saturated alcohol preferably has a saturated hydrocarbon group having 4 to 30 carbon atoms. The saturated hydrocarbon group may be a straight-chain type or a branched type. When the number of carbon atoms is 4 or more, it is preferable to easily realize a sufficiently low friction coefficient. Is not saturated.

The content ratio of the monohydric saturated alcohol is from 0.05 to 20% by mass, preferably from 0.1 to 15% by mass, more preferably from 0.5 to 10% by mass, and particularly preferably from 1 to 10% by mass. 5% by mass.

When the content is 0.05% by mass or more, it is easy to realize a sufficiently low friction coefficient, which is preferable. Further, when the content is 20% by mass or less, the effect is not saturated and an effect commensurate with the added amount is obtained, so that it is preferable.

The monohydric unsaturated alcohol preferably has an unsaturated hydrocarbon group having 4 to 30 carbon atoms. The unsaturated hydrocarbon group may be a straight-chain type or a branched type. When the number of carbon atoms is 4 or more, a sufficiently low coefficient of friction can be easily achieved, and it is preferable. When the number of carbon atoms is 30 or less, the effect is not saturated, so that it is preferable.

The content of the monounsaturated alcohol is from 0.05 to 40% by mass, preferably from 0.1 to 30% by mass, more preferably from 0.5 to 20% by mass, and particularly preferably from 1 to 30% by mass. It is 15% by mass.

When the content is 0.05% by mass or more, it is easy to realize a sufficiently low friction coefficient, which is preferable. New Further, when the content is 40% by mass or less, the effect is not saturated and an effect commensurate with the added amount is obtained, so that it is preferable.

The polyhydric alcohol may be a dihydric or higher alcohol, but is preferably a dihydric to pentahydric alcohol, particularly preferably a dihydric to tetrahydric alcohol.

The hydrocarbon group in the polyhydric alcohol may be linear or branched, and may be saturated or unsaturated. Further, the hydrocarbon group may contain an ether bond. Specific examples of the polyhydric alcohol having a hydrocarbon group containing an ether bond include polyalkylene dalicol. Further, the carbon number of the hydrocarbon group is preferably from 4 to 2000, more preferably from 4 to 100, particularly preferably from 4 to 200, and most preferably from 4 to 100.

When the total number of carbon atoms in the hydrocarbon group is 4 or more, it is easy to realize a sufficiently low friction coefficient, which is preferable. Further, when the total number of carbon atoms is 2000 or less, the viscosity rise does not become too large, and an appropriate viscosity is easily obtained.

Polyanolylene glycol is represented by the formula H— (OR) _n —OH, where OR is an oxyalkylene group. The molecular weight of the polyalkylene glycol is preferably from 500 to 400. Examples of the oxyalkylene group include an oxyethylene group, an oxypropylene group, an oxybutylene group, an oxypentylene group, and the like. The oxyalkylene group and the oxypropylene group are preferable, and the combination of the oxyethylene group and the oxypropylene group is particularly preferable. When both an oxyethylene group and an oxypropylene group are contained, they may have a random structure or a block structure. The content ratio of the oxyethylene group and the oxypropylene group is preferably from 20:80 to 60:40 by mass ratio.

Furthermore, in this polyhydric alcohol, the hydroxyl group may be partially esterified. Examples of the hydrocarbon group forming an ester include various hydrocarbon groups such as an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, and an aromatic group, and a linear or branched aliphatic hydrocarbon group is preferable. Les ,. The partial ester of the polyhydric alcohol may have at least one unesterified hydroxyl group. The number of hydrocarbon groups forming the ester is It is preferable that the total amount with the hydrocarbon group falls within a preferable range of the hydrocarbon group of the polyhydric alcohol.

If the polyhydric alcohol is partially esterified and only one hydroxyl group remains, it is included in monohydric alcohol.If the polyhydric alcohol is partially esterified and two or more hydroxyl groups remain, it is included in polyhydric alcohol. .

The content ratio of the polyhydric alcohol is 0.05 to 40% by mass, preferably 0.1 to 30% by mass, more preferably 0.5 to 20% by mass, and particularly preferably 1 to 15% by mass. It is mass%.

Examples of polyphenyl ethers include polyphenyl ethers such as diphenyl ether, triphenylene ether, tetraphenyl ether, pentaphenylene ether and the like, alkylated polyphenyl ethers, and alkylated polyphenyl ethers. I like it. Specific examples of the alkylated polyphenyl ethers include alkyl diphenyl ether, dianolequinolediphenyl ether, alkynoletriphenyl ether, dialkyl triphenyl ether, anoalkyl tetraphenyl ether, and dialkyl tetraphenyl ether. Acetole, alkynolepentapheninoleatenole, dianolequinolepentafine linoleate, etc. are preferred, and dialkyldiphenyl ether is particularly preferred. The alkyl group of the alkylated polyether preferably has 4 to 30 carbon atoms. The number of alkyl groups is preferably from 1 to 3, more preferably from 1 to 2, and particularly preferably 2. The plurality of alkyl groups may be the same or different.

Porifue -... The content of ethers is 0 0 5-4 0 weight ^_0/0, preferably 0 to 3 0% by weight, more preferably 0 5 to 2 0% by weight, particularly preferably 1 to It is 15% by mass.

When the content is 0.05% by mass or more, it is easy to realize a sufficiently low friction coefficient, which is preferable. When the content is less than 40% by mass, the effect is not saturated, and the effect corresponding to the added amount is not obtained. Is preferred.

In the method for producing a lubricating oil composition, at least one selected from alcohols such as monohydric saturated alcohols, monohydric unsaturated alcohols, and polyhydric alcohols and polyphenyl ethers may be mixed before heating the base oil. The base oil may be mixed with the base oil when the base oil is heated, or may be mixed with the base oil after the base oil is heated. However, it is preferable that the base oil be present in the base oil during the heating.

When mixing at least one selected from a compound having both a non-polar group and a polar group, and a compound having a non-polar group dissolved in a base oil and having a weak bond-forming ability with an inorganic acid, It is preferable to use a solid inorganic acid as a reaction intermediate with this compound. In particular, when an alcohol or polyphenyl ether is mixed, it is preferable to use a solid inorganic acid at room temperature as a reaction intermediate with the alcohol or polyphenyl ether. A reaction intermediate between an inorganic acid and an alcohol that is solid at room temperature is not an ester that is the final product of the reaction, that is, the inorganic acid and the alcohol are not strongly bonded by an ester bond, but are at room temperature. Is a substance in which a solid inorganic acid and an alcohol are linked by a weak bond such as hydrogen bond, intermolecular attraction or electric attraction. In addition, the reaction intermediate between a solid inorganic acid at room temperature and polyphenyl ether is linked to a solid inorganic acid at room temperature and polyphenyl ether by a weak bond such as hydrogen bond, intermolecular attraction or electrical attraction. Indicates a substance that is

It should be noted that simply mixing the inorganic acid and the alcohol or polyether at room temperature, which are solid at room temperature, does not form any bond between the two and no reaction intermediate is produced. The reaction intermediate between an inorganic acid that is solid at room temperature and an alcohol or polyether is preferably a reaction intermediate between a phosphorus-based inorganic acid or boron-based inorganic acid that is solid at room temperature and an alcohol or polyether.

At least one selected from a solid inorganic acid at room temperature, a compound having both non-polar and polar groups, and a compound having a non-polar group dissolved in a base oil and having a weak bond-forming ability with an inorganic acid. The proportion of each component used to produce a reaction intermediate with one (hereinafter also referred to as a reaction intermediate) is not particularly limited as long as the reaction intermediate can be produced. It can be chosen in various proportions.

The content ratio of the reaction intermediate, particularly the reaction intermediate between an inorganic acid and an alcohol or polyether which is solid at room temperature, is 0.05 to 20% by mass, preferably 0.1 to 17.5% by mass. %, More preferably 0.5 to 15% by mass, particularly preferably 1 to 12.5% by mass.

If the content is 0.05% by mass or more, a sufficiently low coefficient of friction can be easily achieved, and if it is 20% by mass or less, the effect is not saturated and an effect commensurate with the added amount can be obtained. preferable.

The reaction intermediate has a weak relationship with an inorganic acid that is solid at room temperature in a base oil, a compound having both a non-polar group and a polar group, and a non-polar group that is dissolved in a base oil and has an inorganic acid. The compound can be formed by bringing at least one compound selected from compounds capable of forming a bond into contact with heating. In particular, the reaction intermediate between the inorganic acid which is solid at room temperature and the alcohol or polyphenyl ether is preferably brought into contact with the inorganic acid which is solid at room temperature and the alcohol or polyphenyl ether under heating in a base oil. Heating may be performed at the same temperature as above. The reaction intermediate can be dissolved in the base oil.

When it is difficult to form a reaction intermediate, a non-polar compound that is dissolved in a base oil at room temperature and is nonpolar and has the ability to form a weak bond with an inorganic acid is mixed beforehand at around the melting point of the inorganic acid. To prepare a reaction intermediate, and then added to the base oil. In this case, as the compound having a nonpolar group dissolved in the base oil and having the ability to form a weak bond with an inorganic acid, one of polyalkylene glycol, a partial ester of a polyhydric alcohol, and polyphenylene ether is used. The above is preferably used.

When an aqueous solution of an inorganic acid that is solid at room temperature is mixed with the base oil, it is preferable that the aqueous solution and the base oil are hardly separated when mixed under heating. As a preferable method, a base oil is heated, and then an inorganic acid which is solid at normal temperature, a compound having both a non-polar group and a polar group, and a non-polar group having a non-polar group dissolved in the base oil and an inorganic acid And at least one compound selected from compounds having a weak bond-forming ability to form a reaction intermediate and dissolve it in a base oil. In particular, the base oil is heated, and then the solid inorganic acid and the alcohol or polyolefin at room temperature. A preferred method is to add a thiol ether to form a reaction intermediate between a solid inorganic acid and an alcohol or polyphenyl ether at room temperature and dissolve the reaction intermediate in a base oil.

The heating temperature is preferably at least 80 ° C, more preferably at least 90 ° C, particularly preferably at least 95 ° C. The upper limit of the heating temperature is preferably 120 ° C. or less from the viewpoint of energy efficiency.

However, when the inorganic acid which is solid at room temperature is boric acid, boric acid or a salt thereof, the heating temperature is preferably 160 ° C or higher, more preferably 170 ° C or higher, and 18 ° C or higher. 0 ° C or higher is particularly preferred. The upper limit of the heating temperature is preferably 200 ° C. or lower from the viewpoint of energy efficiency.

The lubricating oil composition of the present invention may contain an inorganic acid that is solid at ordinary temperature or an ester of an alcohol that is solid at ordinary temperature, together with a reaction intermediate between the inorganic acid that is solid at ordinary temperature and alcohol. Preferably, the ester is not contained. Even when an ester is contained, the content of the inorganic acid, the alcohol and the ester in a balanced state when these esters are present is preferably 90% by mass or less.

The lubricating oil composition of the present invention preferably contains an antiwear agent or an antiwear agent. Preferable specific examples of the antiwear agent or the wear modifier include phosphate ester, phosphite ester, acid phosphate ester, acid phosphate ester amine salt, thiophosphate, thiophosphite, olefin sulfide, polysulfide, Z n dithiophosphate, Mo dithiophosphate, Mo dithiobamate and (poly) glyceryl ether. The wear inhibitor or the wear modifier may be used alone, or may be used in combination of two or more of the wear inhibitor and the wear modifier. By including an anti-wear agent or an anti-wear agent, a lubricating oil composition having more excellent wear resistance can be obtained.

The phosphate ester used as a wear inhibitor or a wear regulator in the present invention preferably has a structure represented by the following formula (1).

In the formula, Ri R ³ represents a hydrogen atom or an alkyl group, an alkenyl group, an alkylaryl group or an arylalkyl group having 1 to 22 carbon atoms, and R ¹ to R ³ are different even if they are the same. Is also good. Preferably, it is an alkyl group having 3 to 9 carbon atoms.

When the number of carbon atoms is 2.2 or less, the solubility in oil is not reduced, so that it is preferable.

Specific examples of the phosphoric acid ester include triaryl phosphate, trialkyl phosphate and the like.For example, benzyl diphen-nore phosphate, aryl diphenyl phosphate, triphenyl rephosphate, tricresino phosphate, ethino resin fenole phosphate, triethyl phosphate Butinorephosphate, Etinoresibutinorephosphate, Cresinoresifeninophosphate, Dicresinolefe.Ninorephosphate, Etinolephenyldipheninophosphate, Jethylfuyulphenylphosphate, Propylpheninoresphenephosphate, Dipropylenophosphate , Trietinolefeninolephosphate, Tripropinolefeninolephosphate, Petinolefe II / Resifueni Rehosufue Ichito, can be mentioned dibutyl Honoré phenylene Honoré phenylene Norehosufue one preparative 及 Pi tripling chill phenylalanine phosphite Hue compounds such as one bets.

The above phosphoric acid esters may be used alone or in combination of two or more.

The phosphite used as the wear inhibitor or the wear modifier in the present invention preferably has a structure represented by the following formulas (2) and (3).

(R ⁴ O) ₃ P (2)

(R ⁴ O) ₂ PHO (3) In the above formulas (2) and (3), R ⁴ is a linear or branched alkyl group having 1 to 20 carbon atoms. More preferably, it is a linear or branched alkyl group having 8 to 18 carbon atoms. Specific examples of R ⁴ include methyl, Echiru, n-propyl, isopropyl, n- Bed chill, isobutyl, secondary butyl, tert- heptyl, n one pentyl, Isopenchiru, secondary Penchinore, neopentyl, tert- pentyl, n —Hexyl, isohexynole, secondary hexinole, 3-methylpentyl, ethylethyl, .n-heptyl, 2-methinolehexynole, secondary heptyl, n-octyl, isooctyl, secondary octyl, tert-octyl, 2-ethylhexyl, 3-methylheptinole, n-nonyl, isonoel, secondary noninole, 1-methyloctynole, ethinoleheptyl, n-decyl, isodecyl, secondary decyl, 1-methylnonyl, n-indecyl, isondecyl , Secondary decyl, 1, 1-dimethylnonyl, n-dodecyl, isododecyl, 2-ptyloctyl, secondary Decyl, n-tridecyl, isotridecyl, secondary tridecyl, n-tetradecyl, isotetradecyl, 2-butyldecyl, 2-hexyloctyl, secondary tetradecyl, n-pentadecyl, isopentadecyl, secondary pentadecyl, n- to Xadecyl, isohexadecyl, 2-hexyldecyl, secondary hexadecyl, n-heptadecyl, isoheptadecyl, secondary hexadecyl, n-octadecyl, isooctadecyl, 2-octyldecyl, 2-hexyldodecyl, sec-octadecyl, Examples include n-nonadecyl, isononadecyl, secondary nonadecyl, 2-octyldodecyl, and icosyl.

Specific examples of phosphites include tris (2-ethylhexyl-13-mercaptopropionate) phosphite, triphenyl phosphite, trioctadecyl phosphite, tristearyl phosphite, and triisooctynolephosphite. Trialkyl phosphites such as tris (nonylphenyl) phosphite, tricresinolephosphite, diphenylisodecyl phosphite, dialkyl phosphite, monoalkyl phosphite, etc. Can be The phosphites may be used alone or in combination of two or more.

The acidic phosphoric acid ester used as a wear inhibitor or a wear modifier in the present invention preferably has a structure represented by the following formula (4). (R ⁵ ) _a H ₃ _ _a 0 ₃ P (4)

(In the formula, R ⁵ represents a hydrocarbon group having 4 or more carbon atoms, and a is 1 or 2.)

Specific examples of R ⁵ are fat aliphatic saturated or unsaturated hydrocarbon group, straight or branched chain having 4 to 20 carbon atoms, i.e. the alkyl group and alkenyl group, an aromatic hydrocarbon having 4 to 20 carbon atoms And cycloalkyl groups. Even if the carbon number is 4 or less or 20 or more, the intended performance may not be achieved. The number of carbon atoms is preferably 6 to 18 carbon atoms, more preferably 8 to 12 carbon atoms.

Specific examples of acidic phosphate esters include, for example, 2-ethylhexyl acid phosphate, isodesyl acid phosphate, laurinorea acid phosphate, tridecyl acid phosphate, stearyl acid phosphate, isostearinoleate acid phosphate, and (Silyl) phosphate and the like.

The acid phosphates may be used alone or in combination of two or more.

The acid phosphate esteramine salt used as a wear inhibitor or a wear modifier in the present invention can be produced by neutralizing the acid phosphate and amine. The amine used for neutralizing the acidic phosphate ester may be, for example, an alkylamine capable of forming a salt, and includes an alkylamine having a structure represented by the following formula (5).

R ⁷ — N (5)

(In the formula, R ⁶ , R ⁷ and R ⁸ are monovalent hydrocarbon groups or hydrogen atoms, at least one of which is a hydrocarbon group.)

Specific examples of alkylamines include dibutylamine, octylamine, dioctylamine, laurylamine, dilaurylamine, cysteine reinoleamine, coconut amine, cow Fatamine and the like.

The acidic phosphoric acid ester amine salts may be used alone or in combination of two or more.

The thiophosphate used as a wear inhibitor or a wear modifier in the present invention preferably has a structure represented by the following formula (6).

R ⁹ 0 \

R ¹⁰ O— P = S (6) In the formula, the rule ⁹ to! ^ ¹¹ represents a hydrogen atom or an alkyl group, alkenyl group, alkylaryl group or aryl ^ alkyl group having 1 to 22 carbon atoms. , R s R ¹ ^^ may be the same or different. Preferably, at least one of R ^{9 to} R is an alkyl group having 3 to 18 carbon atoms, and particularly preferably, all of R ^{9 to} R n are an alkyl group having 3 to 18 carbon atoms.

If the number of carbon atoms is 22 or less, the solubility in oil is not reduced, so that it is preferable.

Specific examples of the above thiophosphates include triarylthiophosphate, trial quinolethiophosphate, etc., for example, penzinoresifeninolethiophosphate, Rinolinesife-norrechophosphate, trifeninorethiophosphate, tricresinorethiophosphate. Phosphate, etinoresifeninolechophosphate, triptinolenothochophosphate, etinoresibbutinorechophosphate, cresinolesfeininorechophosphate, diclezinolefeninorechophosphate, etinolefueni Noresiphenyl phenol phosphate, ethynolephenylphenyl thiophosphate, propylphenyl diphenyl phenol phosphate, dipropynolephenyl phenyl phenol phosphate, triethyl phenol thiol phosphate Chromatography, tri-propyl-phenylene thiophosphate can include Buchinorefue two Honoré Jifuwe two Ruchiohosufue Ichito, Jibuchirufuwe two Rufuwe two Ruchiohosufue Ichito及Pito Ribuchirufue two Ruchiohosufue compounds such as one bets.

Thiophosphate may be used alone or in combination of two or more. May be used.

The thiophosphite used as a wear inhibitor or a wear modifier in the present invention preferably has a structure represented by the following formula (7).

R ¹² S \

'R ¹³ S— P (7)

During R ¹⁴ SZ formula, R ^{1 2} ~ scale ^{1 4} represents a hydrogen atom or an alkyl group with carbon number 1-2 2, an alkenyl group, an alkyl § aryl group or § reel alkyl group, R ^{1 2} to R ^{1 4} May be the same or different. Preferably, at least one of R ^{1 2} to R ^{1 4} is an alkyl group having 3-1 8 carbon atoms, particularly preferably, 1 ^{1 2-1} ¹ All ⁴ Al kill group having 3 to 8 carbon atoms It is.

Specific examples of the thiophosphite include triarylthiophosphite, trialkylthiophosphite, and the like.For example, benzyldiphenylthiophosphite, arylinosylthiophosphite, triphenylenophosphite, triphenylenophosphite, and the like. Triklezinole thiophosphite, echinolesifeninolethiophosphite, triptych phosphite, echinolesipetinole phosphite, krez_ Ninorethiophosphite, Jetinorefue, Ninorefe-Norethiophosphite, Propinolefeninolediene feniolethiophosphite, Dipropinolefe-Norefeline thiophosphite, Trietinolefe Ninorethiophosphite Wells, may be mentioned tripropinoin les phenylene Honoré Chio phosphate phi DOO, the Puchinorefue two Honoré Ziff two thioether phosphine eye DOO, dibutyl Honoré phenyl off eh Honoré Chio phosphine eye To及Pito Ripuchirufuwe compounds such two Lucio phosphite.

The thiophosphites may be used alone or in combination of two or more.

Olefin sulfide, polysulfur used as a wear inhibitor or a wear modifier in the present invention The eye is at least one selected from hydrocarbon sulfides and sulfurized fats and oils, and the hydrocarbon sulfide preferably has a structure represented by the following formula (8).

R ¹⁵ -S _x — (R ¹⁶ -S _x ) _n -R ¹⁷ (8)

R ¹⁵ and R ¹⁷ are the same or different monovalent hydrocarbon groups, and R ¹⁶ is a divalent hydrocarbon group. X is an integer of 1 or more, preferably an integer of 1 to 8, and in the repeating unit, each X may be the same or different. n is 0 or an integer of 1 or more. As R ¹⁵ and R ¹⁷ , a linear or branched saturated or unsaturated aliphatic hydrocarbon group having 2 to 20 carbon atoms, preferably 4 to 18 carbon atoms (eg, an alkyl group, an alkenyl group, etc.), an aromatic group And a hydrocarbon group.

Specific examples include an ethyl group, a propyl group, a butyl group, a nonyl group, a dodecyl group, a probel group, a butyl group, a benzyl group, a phenyl group, a trinole group, and a hexylphenyl group. The R ^16, 2 to 26 carbon atoms, preferably a divalent aliphatic hydrocarbon group having 4 to 18, and an aromatic hydrocarbon group. Specific examples include an ethylene group, a propylene group, a butylene group, and a phenylene group.

Further, the hydrocarbon sulfide preferably has a structure represented by the following formula (9).

R ¹⁸ _S _X — R ¹⁹ (9) In the formula, R ¹⁸ and R ¹⁹ are the same as R ¹⁵ and R ¹⁷ in the formula (8), and may be the same or different. Is also good. X is an integer of 1 or more, preferably an integer of 1 to 8.

Examples of the sulfurized oils and fats include sulfurized oils and fats which are sulfides of animal and vegetable oils, such as lard sulfide, sulfurized rapeseed oil, sulfurized castor oil, and sulfurized soybean oil.

Sulfated olefins can be obtained by sulfurizing olefins such as polyisobutylene and terpenes with sulfur and other sulfurizing agents. The olefin sulfide and the polysulfide may be used alone or in combination of two or more.

The Zn dithiophosphate used as a wear inhibitor or a wear modifier in the present invention is preferably represented by the following formula (10).

( Ten )

Where R ² . , R ²¹ , R ²² and R ²³ are the same or different and are primary alkyl groups having 4 or more carbon atoms. R ² °, R ²¹ , R ²² and R ²³ preferably have 4 to 20 carbon atoms. A carbon number of 4 or more is preferable because sufficient lubricity is obtained, and a carbon number of 20 or less is preferable because sufficient lubricity is obtained similarly. Preferred carbon numbers are 5-18, more preferably 6-12.

Specific examples include a primary otatyl group, a decyl group, a dodecyl group, a tetradecyl group, and a hexadecyl group.

Zn dithiophosphate may be used alone or in combination of two or more.

The Mo dithiophosphate and the Mo dithiophosphate used as the wear inhibitor or the wear modifier in the present invention are preferably those represented by the following formulas (11) and (12), respectively.

(11)

Wherein ^{(1 1), R 24 ~R} 27 is a hydrocarbon group having 4 to 18 carbon atoms, each of the four R ² ⁴ to R ²⁷ may be the same or different, X ^1, X ^2, YY ² is an oxygen atom or a sulfur atom, which may be the same or different. A carbon number of 4 or more is preferable because sufficient lubricity is obtained, and a carbon number of 18 or less is also preferable because sufficient lubricity is obtained. Preferred carbon number is 6-12.

In the formula (12), R ^{28 to} R ³¹ are a hydrocarbon group having 4 to 18 carbon atoms, and the four R ^{28 to} R ³¹ may be the same or different, and X ³ and X ⁴ , Y ^3, Upsilon ⁴ is an acid atom or a sulfur atom, may each be the same or different. A carbon number of 4 or more is preferable because sufficient lubricity is obtained, and a carbon number of 18 or less is also preferable because sufficient lubricity is obtained. Preferred carbon number is 6-12.

In the formulas (11) and (12), examples of the hydrocarbon group include an alkyl group, an alkenyl group, and an aryl group.

In the present invention, two or more molybdenum dithiophosphates having different alkyl groups may be used as a mixture, or two or more molybdenum dithiophosphates having different alkyl groups may be used as a mixture. In addition, one or more molybdenum dithiophosphates having the same or different alkyl groups and one or more molybdenum dithiophosphates having the same or different alkyl groups may be used in appropriate combination.

The (poly) glyceryl ether used as a wear inhibitor or a wear modifier in the present invention preferably has a structure represented by the following formula (13).

H ₍₁₃ )

Wherein (13), R ³² represents an alkyl group, an alkenyl group or an Ariru group having 1 to 30 carbon atoms. It is preferably an alkyl group, an alkenyl group or an aryl group having 6 to 22 carbon atoms.

When the number of carbon atoms is 30 or less, the solubility in oil is not reduced, so that it is preferable. Equation (1 In 3), n is a coefficient indicating the degree of polymerization of glycerin, and is a number of 1 or more, preferably a number of 15. Here, n is an average value.

Specific examples of the alkyl group having 120 carbon atoms include, for example, those similar to the alkyl groups having 120 carbon atoms described as specific examples of R ^{4 in} the formulas (2) and (3). Specific examples of the alkyl group having 2130 carbon atoms include docosyl, tetracosyl, triacontyl, 2-decyltetradecyl, 2-dodecylhexadecyl, 2-xadecylococtadecyl, 2-tetradecyloctadecyl, Monomethyl branched isostearyl and the like can be mentioned.

Specific examples of the alkenyl group having 230 carbon atoms include, for example, butyl, aryl, p-butanol, buteninole, isovbuteninole, pentenenore, isopenteninole, hexeninole, hepteninole, octennole, de nénénole , Pendeseninole, dodeceninole, tetradecenyl, oleyl and the like.

The alkyl group includes a cycloalkyl group, and the alkenyl group also includes a cycloalkyl group.

Examples of the cycloalkyl group and cycloalkenyl group include, for example, cyclopentyl, cyclin hexinole, cyclin heptinole, methinoresin pentinole, methinoresin hexinole, methinolesin hexinnole, syrup penteninole, sicen hexenol, And the like.

Examples of the aryl group having 630 carbon atoms include, for example, phenyl, tolyl, xylyl, cumeninole, mesityl, benzyl, phenethyl, stylinole, cinnaminole, benzhydryl, trityl, ethynolepheninole, propinolephenylinole, butylphenyl, butylphenyl Feninole, hexinole feninole, heptinole feninole, octinolephen-nore, feninolefen-le, decinolephenine, pendecylphenyl, dodecylphenyl, fuenure-nore, benzinolephenyl, styrenated feninole , P-tamylphenyl, -naphthinole, β-naphthyl group and the like.

(Poly) glyceryl ethers may be used alone or in combination of two or more. They may be used together.

Of these wear inhibitors or friction modifiers, a combination of an acidic phosphoric acid ester amine salt and (poly) glyceryl ether is preferred.

In the lubricating oil composition of the present invention, the content ratio of the above-mentioned antiwear agent or friction modifier is preferably 0.01 to 5% by mass, more preferably 0% by mass for each of various wear inhibitors or various friction modifiers. . 1-3 mass ^_0/0, more preferably 0.3 to 2% by weight, particularly preferably 0.5 to 1.5 mass ^_0/0.

A content of 0.01% by mass or more is preferable because sufficient effects can be obtained, and a content of 5% by mass or less is preferable because effects are not saturated and effects commensurate with the added amount can be obtained.

The lubricating oil composition of the present invention preferably contains an antioxidant. As the antioxidant, at least one selected from an alkylated diphenylamine, an alkylated phenyl-naphthylamine and a hindered phenol is preferable.

The alkylated difuramine has a structure represented by the formula (14).

In the above formula, R ³³ and R ³⁴ are a hydrogen atom or a linear or branched alkyl group having 1 to 16 carbon atoms. More preferred are straight-chain or branched-chain alkyl groups having 3 to 9 carbon atoms, and particularly preferred are hydrogen atoms or straight-chain or branched-chain alkyl groups having 4 and 8 carbon atoms.

It is preferable that the alkyl group has 16 or less carbon atoms because the solubility in oil is not reduced. R ³³ and R ³⁴ may be the same or different.

Specific examples of the linear or branched alkyl group include, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, isoptyl, tert-butyl, n-pentinole, isopentinole, neopentinole, tert-pentinole, 2—Methylbutyl, n— Hexyl, isohexyl, 3-methynolepentyl, ethylheptyl, n-heptinole, 2-methylhexenole, n-octynole, isooctynole, tert-octyl, 2-ethylhexyl, 3-methylheptinole, n- Nonyl, isonoel, 1-methyloctyl, ethylbutyl, n-decyl, 1-methylnonyl, n-decinole, 1,1-dimethylynol, n-dodecyl, n-tetradecyl and the like.

Preferred specific examples of the alkylated diphenylamine include, for example, diphenylamine, butinoresiphenylamine, otatinoresiferamine, dibutyldiphenylamine, octylbutyldiphenylamine, octyldiphenylamine and the like. Is mentioned. The alkylated diphenylamines may be used alone or in a combination of two or more.

The content ratio of the alkylated diphenylamine is from 0.05 to 2% by mass, preferably from 0.1 to 1.5% by mass, more preferably from 0.1 to 1% by mass.

In content is 0.05 mass ^_0/0 or more, preferably a sufficient acid I arsenide preventing capability is obtained, and in 2 wt% or less, the effect is not saturated, the effect commensurate with the addition amount is obtained preferable.

The alkylated phenyl c-naphthylamine has a structure represented by the formula (15).

In the above formula, R ³⁵ is a linear or branched alkyl group having 1 to 16 carbon atoms. More preferably, it is a linear or branched alkyl group having 4 to 8 carbon atoms.

Specific examples for R ³⁵ include those similar to the specific examples of the alkyl group of straight or branched chains of R ³³ and R ³⁴ in the general formula (14).

Specific examples of the alkylated phenyl_α-naphthylamine include η-pentynole Α-naphthylamine, 2-methylbutylated phenyl α-naphthylamine, 2-ethylhexylated phenol-α-naphthylamine, η-octylhyphen, 2-naphthylamine, η-phenylphenyl phenol Mono-naphthylamine, 1-methylcyclooctylated phenyl α-naphthylamine, η-undecylated phenyl-1-α-naphthylamine, η-dodecylated phenyl α-naphthylamine. The alkylated phenyl-α-naphthylamines may be used alone or in combination of two or more.

The content ratio of the alkylated phenyl-naphthylamine is from 0.05 to 2% by mass, preferably from 0.1 to 1.5% by mass, more preferably from 0.1 to 1% by mass.

A content of 0.05% by mass or more is preferable because sufficient antioxidant ability is obtained, and a content of 2% by mass or less is preferable because the effect is not saturated and an effect commensurate with the added amount is obtained.

As the hindered phenols, those having a structure represented by the formulas (16), (17) and (18) are preferable.

(17)

³⁶ , R ³⁷ , R ³⁸ and R ³⁹ in the above formula (16) each represent a hydrogen atom or It represents a linear or branched alkyl group having 1 to 12 carbon atoms. Preferably, it is a hydrogen atom or a linear or branched alkyl group having 4 to 8 carbon atoms. R ³⁶ , R ³⁷ , R ³⁸ and R ³⁹ may be the same or different.

In addition, R ^4. Is a methylene group having 1 to 5 carbon atoms, preferably 1 to 4. R ⁴¹ and R ⁴² in the above formula (17) each represent a hydrogen atom or a linear or branched alkyl group having 1 to 12 carbon atoms. Preferably, it is a hydrogen atom or a linear or branched alkyl group having 4 to 8 carbon atoms. R ⁴¹ and R ⁴² may be the same or different.

Further, n is an integer of 1 to 4, and preferably 1 to 3.

R ⁴³ , R ⁴⁴ and R ⁴⁵ in the above formula (18) each represent a hydrogen atom or a linear or branched alkyl group having 1 to 12 carbon atoms. Preferably, R ⁴³ and R ⁴⁴ are a hydrogen atom or a linear or branched alkyl group having 4 to 8 carbon atoms. R ^43, R ⁴⁴ and R ⁴ ⁵ may be the same or may be different.

The above hindered phenols may be used alone or in combination of two or more.

Content of hindered Hainaut Honoré acids is 0. a 05-2 mass ^_0/0, preferably 0.: a ~ 1.5 wt%, more preferably from 0.1 to 1 wt%!.

In content is 0.05 mass ^_0/0 or more, preferably a sufficient antioxidant capacity is obtained, and in 2 wt% or less, the effect is not saturated is preferable because the effect corresponding to the addition amount is obtained.

Preferably, the lubricating oil composition of the present invention contains a metal deactivator and a deterrent. As the metal deactivator and the deterrent, at least one selected from benzotriazole and its derivatives and alkylsuccinic acid derivatives is preferable.

Benzotriazole and its derivatives include derivatives obtained by reacting benzotriazole with water-soluble amines and fatty acid esters. These benzotriazoles and derivatives thereof may be used alone or in combination of two or more. Content of base Nzotoriazoru and its derivatives used in the present invention, 0.1 is 001 to 0.05 mass ^_0/0, preferably from 0.003 to 0.02 mass ^_0/0.

A content of 0.1% by mass or more is preferable because sufficient metal corrosion inhibitory properties can be obtained, and is 0.05% by mass. /. The following is preferable because the effect is not saturated and an effect commensurate with the added amount is obtained.

Alkyl succinic acid derivatives include alkyl succinic acid amides, alkyl succinic acid esters, and the like. Suitable alkyl succinic acid derivatives include those represented by the formulas (19) and (20). It has.

R ^o -CH -COOH

I ₄₇ (19)

CH ₂ — COOR

0 H H

II

R ⁴⁸ — CH = CHCH ₂ CHCH ₂ CN- (CH J.-N

O (20)

C 1 CH ₂ -CH-CH ₂ CH = CH R ⁴⁹

COOH In the above formulas (19) and (20), R ⁴⁶ , R ⁴⁸ and R ⁴⁹ are an alkyl group or an alkyl group having 6 to 18 carbon atoms, and R ⁴⁷ is a hydrogen atom or a carbon atom having 1 to 5 carbon atoms. Represents an alkyl group. R ⁴⁶ is preferably a C14-C14 alkenyl group, particularly preferably dodecyl or dodecadienyl. R ⁴⁸ and R ⁴⁹ are preferably an alkyl group or an alkenyl group having 8 to 16 carbon atoms.

Specific examples of R ⁴⁶ , R ⁴⁸ and R ⁴⁹ include hexyl, octyl, noel, decyl, pendecyl, dodecyl, tetradecyl, heptadecyl, octadecyl, hexenyl, octenyl, nonenyl, decenyl, ndecenyl, dodecenyl, Tetradecenyl, heptadecenyl, octadecenyl, hexedeninole, octageninole, nonageni nore, decadienole, pendecadienole, dodecadienole, tetradecadienole, tetradecadienole Peptadeforce genil, octadecadenyl and the like.

Specific examples of R ^{4 7} is, n- propyl, Isopuropiru, n- heptyl, Isopuchiru, tert- heptyl, n- Penchinore, Isopenchinore, neopentyl, tert- pen chill, 2-methylbutyl and the like. These alkyl succinic acid derivatives may be used singly or in a combination of two or more, but are preferably a combination of two or more, and particularly preferably a partial ester of alkenyl succinic acid. It is a combination of alkyl succinamides.

Content of the derivatives of alkyl succinic acids, 0. 0 1-0. A 3 wt%, is preferred properly 0. 0 3-0. 1 mass ^_0/0, and particularly preferably 0. 0 3-0 0.07% by mass.

If the content ratio is 0.01% by mass or more, sufficient metal corrosion prevention is obtained, so that it is preferable. If the content ratio is 0.3% by mass or less, the effect is not saturated and an effect commensurate with the added amount is obtained. Therefore, it is preferable.

The lubricating oil composition of the present invention may optionally contain various additives other than those described above. Examples of the additive include a pour point depressant such as styrene-butadiene copolymer, ethylene-propylene copolymer, polyisobutylene, and polymethacrylate; and a viscosity index improver such as an olefin copolymer.

The lubricating oil composition of the present invention can be used as a lubricating oil for various devices. In particular, when used as a lubricating oil composition for sintered metal bearings, excellent effects can be exhibited. Example

Next, the present invention will be described more specifically with reference to examples. Note that the present invention is not limited by these examples.

In Examples and Comparative Examples, a lubricating oil composition was prepared by blending a base oil and additives of each component, and the wear resistance and friction coefficient of each were evaluated. The base oils and additive components used in the preparation of the compositions in each of the examples and comparative examples are as follows.

, (1) Base oil The base oils are: (1) a highly refined paraffinic mineral oil, solvent-extracted vacuum distillation distillate with furfural, solvent dewaxing with methyl ethyl ketone, and further hydrorefined mineral oil, or (2) industrially Poly-α-olefin, a synthetic oil synthesized, was used. The kinematic viscosity at 40 ° C according to the JISK 228 3 kinematic viscosity test method was 10 to 30 mm ² / s. Or (3) Diester, which is a synthetic oil synthesized industrially, was used. The kinematic viscosity at 40 ° C. was 8 to 20 mm ² / s.

(2) phosphorous acid

Phosphorous acid used was solid.

(3) hypophosphorous acid, pyrophosphoric acid, pyrophosphorous acid

Hypophosphorous acid, pyrophosphoric acid and pyrophosphorous acid were used as aqueous solutions. The concentration of the phosphorus-based inorganic acid in each aqueous solution was 50% by mass, 5% by mass, and 20% by mass, respectively.

(4) Polyphosphoric acid

(HO) were used _{2 P = 0- (0-P} = 0 (OH)) n -P = 0 (OH) polyphosphoric acid n = 4 represented by _2. Polyphosphoric acid was used as an aqueous solution. The polyphosphoric acid concentration of the aqueous solution was 75% by mass.

(5) boric acid

Boric acid was used in a solid form.

(6) Borous acid

Borous acid was used in solid form.

(7) alkylated diphenylamine

In the formula (14), R ³³ and R ³⁴ are a mixture of any combination of a hydrogen atom, a linear or branched C ₄ H ₉ group, and a linear or branched C ₈ H ₇ group. Certain alkylated diphenylamines were used.

(8) Alkylated phenyl α-naphthylamine

In the formula (15), an alkylated phenyl-1-naphthylamine in which R ³⁵ is a linear or branched C ₈ H ₁₇ group was used.

(9) Hindered phenol In the formula (1 8), ⁴³及Pi 1 ⁴⁴ Gase ert- butyl group, R ⁴⁵ is using 2, 6-di-tert- Puchiru 4 one methyl phenol methyl group.

(10) Alkyl succinate

In the formula (19), an alkyl succinate in which R ⁴⁶ is an alkenyl group having 12 carbon atoms and R ⁴⁷ is an alkyl group having 5 carbon atoms was used.

(1 1) Phosphate ester

In the formula (1), a phosphate ester in which Ri R ³ is the same alkyl group having 7 carbon atoms was used.

(1 2) phosphite

In the formula (2), a phosphite in which R ⁴ is a linear or branched C ₁₂ H ₂₅ group was used.

(1 3) acid phosphate

In the formula (4), an acidic phosphate ester in which a = 1 and R ⁵ is a linear or branched C ₈ H ₁₇ group was used.

(14) Acid phosphate esteramine

The oleylamine salt of the above acidic phosphate was used.

(1 5) Choosphere

In the formula (6), a thiophosphoate in which all of R ^{9 to} Rn are linear C ₁₂ H ₂₅ groups was used.

(1 6) Chophophosphite

In the formula (7), all of R ¹² to R ¹⁴ is used Chiohosufa I bets is C ₁₂ H ₂₅ group linear.

(1 7) Olefin sulfide

In the formula (8), n = l, x = l, the alkyl group of R ¹⁵ and R ¹⁷ is 8 carbon atoms, R ¹⁶ is using sulfide Orefin an alkylene group having 8 carbon atoms.

(1 8) Polysulfide

In the formula (9), _x = l, and R ¹⁸ and R ¹⁹ are polyalkyl groups having 12 carbon atoms. Sulfide was used.

(1 9) Zn dithiophosphate

In the formula (10), Zn dithiophosphate in which R ² ° to: R ²³ is an alkyl group having 8 carbon atoms was used.

(20) Mo dithiocarbamate

In the formula (11), Mo dithiocarbamate in which X ¹ , X ² and Y \ Y ² are all sulfur atoms and R ^{24 to} R ²⁷ are alkyl groups having 8 carbon atoms was used.

(21) Mo dithiophosphate

In the formula ^{(1 2), X 3,} X 4, Y 3, Υ 4 is all sulfur atom, R ²⁸ to R ³¹ is used Mo di Chio phosphate is an alkyl group of 8 carbon atoms.

(21) (Poly) glyceryl ether

In the formula (1 3), was used an alkyl group for R ³² is 18 carbon atoms, an n = 2 (poly) grayed Li glyceryl ether.

(Evaluation method) '

(1) Shell four-ball test method for evaluating wear resistance>

One of the methods for evaluating the wear resistance of lubricating oil was performed in accordance with AS TMD 2783, and the wear resistance was evaluated by the wear diameter. The test conditions are shown below.

Test conditions Rotation speed: 1200 rpm

Load: 40 kgf

Test time: 60 min

Test temperature: 75 ° C

(2) Evaluation method of friction coefficient S R V>

As one of the methods to evaluate the friction coefficient of lubricating oil, the friction coefficient after 60 minutes was measured under the following test conditions using an OPTimol SRV friction and wear tester, and the friction coefficient was evaluated. Test conditions Frequency: 5 OH z

Amplitude: 1.0 mm

Load: 100 N

Test time: 60 min

Test temperature: room temperature. Specimen: Upper cylinder diameter 15 X 22 mm (SU J-2) (Line contact) Lower disk diameter 24 X 7.85 mm (SU J-2)

(3) Thermal stability evaluation method Sludge test method>

One of the methods for evaluating the thermal stability of lubricating oil, based on a test based on the thermal stability test specified in JI SK2540.

Test conditions Temperature: 170 ° C

Time: 12 h r

評価 Evaluation method of corrosion prevention to metal

One of the methods for evaluating the corrosion inhibitory property of lubricating oil, which was carried out in accordance with JI SK 2513, and the corrosion inhibitory property to metal was evaluated based on the degree of discoloration of the copper plate.

Evaluation method of fire protection

One of the methods for evaluating the lubricity of a lubricating oil was performed according to the method established in JISK2510.

(Examples 1 to 9)

The phosphorus-based inorganic acid in the form of particles is blended with the base oil at room temperature in the proportions (% by mass) listed in the upper row of Tables 1 and 2, and the mixture is stirred and heated to a temperature 10 ° C lower than the melting point of the phosphorus-based inorganic acid. Heating was performed to prepare a lubricating oil composition in which the phosphorus-based inorganic acid was dispersed or dissolved.

When the phosphorus-based inorganic acid is hypophosphorous acid, pyrophosphoric acid, pyrophosphorous acid, or polyphosphoric acid, the base oil is an aqueous solution of these phosphorus-based inorganic acids and is listed in the upper row of Tables 1-2. The mixture was heated at 10 ° C with stirring and mixed at room temperature, and then cooled to room temperature. Then, other additives were added, and the phosphorus-based inorganic acid was added. A dispersed or dissolved lubricating oil yarn composition was prepared.

Various performances of these ^ 1 products were evaluated, and the results are shown in Tables 1 and 2 below. (Examples 10 to 33)

The phosphorus-based inorganic acid in the form of particles is blended with the base oil at room temperature in the proportions (% by mass) shown in the upper part of Tables 3 to 7, and this mixture is heated to a temperature 10 ° C lower than the melting point of the phosphorus-based inorganic acid. Next, alcohol was added, mixed, and then cooled to room temperature, and further other additives were added to prepare a lubricating oil composition.

In Examples 18 and 31, the base oil used was a mixture of base oil (1) and base oil (3) at a mass ratio of 9: 1.

When the phosphorus-based inorganic acid is hypophosphorous acid, pyrophosphoric acid, pyrophosphorous acid, or polyphosphoric acid, the base oil is an aqueous solution of these phosphorus-based inorganic acids, and the ratios listed in the upper row of Tables 3 to 7 are used. (Mass%) at room temperature, heating and mixing this mixture at 100 ° C. with stirring, then adding alcohol, mixing, and then cooling to room temperature, and further adding other additives. A lubricating oil composition in which phosphorus-based inorganic acid was dispersed or dissolved was prepared. The lubricating oil compositions obtained in Examples 10 to 33 show that a reaction intermediate between the phosphorus-based inorganic acid and the alcohol was formed. The absence of the ester was confirmed by a shift in the signal depending on the binding state when P-NMR measurement was performed. In addition, at the time when the phosphorus-based inorganic acid and the alcohol were mixed at room temperature, it was confirmed by the same method that no reaction intermediate between the phosphorus-based inorganic acid and the alcohol was generated.

Various performances of these yarn compositions were evaluated, and the results are shown in Tables 3 to 7 below.

(Example 34)

In the base oil, boric acid in the form of particles was blended at room temperature at the ratio (% by mass) listed in the upper row of Table 8. The mixture was heated to 160 ° C., which is 10 ° C. lower than the melting point of boric acid (170 ° C.), while stirring, to prepare a lubricating oil composition in which boric acid was dispersed or dissolved. .

Various performances of the composition were evaluated, and the results are shown in the lower part of Table 8.

(Examples 35 to 40)

The boron-based inorganic acid in the form of particles is blended with the base oil at room temperature in the proportion (mass%) shown in the upper row of Table 9, and this mixture is heated to a temperature lower by 10 ° C than the melting point of the boron-based inorganic acid. Was added, mixed, and then cooled to room temperature, and other additives were added to prepare a lubricating oil composition.

In Example 40, the base oil used was a mixture of base oil (1) and base oil (3) at a mass ratio of 9: 1.

The lubricating oil compositions obtained in Examples 35 to 40 show that a reaction intermediate between the boron-based inorganic acid and the alcohol was formed. It was confirmed by NMR measurement that the signal was shifted depending on the state of bonding when no ester was formed. In addition, it was confirmed by the same method that when the boron-based inorganic acid and alcohol were mixed at room temperature, no reaction intermediate between the boron-based inorganic acid and the alcohol was formed.

Various performances of the composition were evaluated, and the results are shown in the lower part of Table 9.

(Examples 41 to 43)

Phosphorous acid and dialkyl diphenyl ether (alkyl group is a mixture of C 6 -C 8 linear or branched alkyl groups), polyalkylene glycol (the ratio of oxyethylene groups to oxypropylene groups is 3: 7 and a molecular weight of about 2000) or a partial ester of a polyhydric alcohol (trimethylolpropane with a monohydric C8 (mixture of linear or branched alkyl groups) with an alcohol) And the number of remaining hydroxyl groups is a mixture of one and two) at room temperature in the proportions (% by mass) listed in the upper row of Table 10. The mixture is mixed with the melting point of phosphorous acid (70%). (° C) and mixed. Thereafter, the mixture was cooled to room temperature, added pressure to the base oil in the proportions listed in Table 1 0 upper (wt. / _0), further adding other additives, to prepare a lubricating oil composition.

The lubricating oil compositions obtained in Examples 41 to 43 showed that a reaction intermediate between phosphorous acid and dialkyldiphenyl ether had been formed. This was confirmed by the shift of the signal depending on the state of binding. Further, it was confirmed by the same method that no reaction intermediate between phosphorous acid and dialkyldiphenyl ether was formed at the time when phosphorous acid and dialkyldiphenyl ether were mixed at room temperature.

Various performances of the composition were evaluated, and the results are shown in the lower part of Table 10. (Comparative Examples 1-2)

Each component was blended with the base oil in the proportions (% by mass) shown in the upper row of Table 11 to prepare a lubricating oil composition. Various performances of these compositions were evaluated, and the results are shown in the lower row of Table 11.

table 1

Table 2

Example Example Example Example Example Example

5 6 7 8 9 Base oil ①

② O 〇〇 O 動 Kinematic viscosity (40 ° C) mm ² / s 18.2 18.2 18.2 18.2 18.2 Additive (% by mass)

Phosphorous acid 0.1 0.1 Hypophosphorous acid

Pyrophosphoric acid 0.1 Pyrophosphorous acid 0.1

Polyphosphoric acid 0.2 0.1 Metaline 0.2

Phosphoric acid 0.2

Shell 4 ball test

0.36 0.36 0.36 0.36 0.34 Wear diameter (mm)

SRV test

0.110 0.110 0.110 0.105 0.100 Friction coefficient Table 3

Kansai 5¾1 data ¹ J Rikiya 1 Tari臾Ka也1 Tari IUII

^, The field \

② 〇〇動 Movement ¾5 degrees (40 C mm / s I /.7/ 1 /.u 1 /.u Additive (% by mass)

Linoleous acid Ό.2. 0.2 n Decanol 11-year-old Leanoreco—No 5 4 4 Alkylated diphenylamine 0.2 Alkylated aa-

0.3 naphthylamine

Shell 4 ball test

(0.35 0.35 0.35 wear diameter, mm)

SRV test

0.095 0.095 0.095 Coefficient of friction

Sludge test

None

Table 4

iral

¾m: ^ Touya 1 Tari 她她 1 T ¹ J 夹 Sword 11 T ¹ J

1 Q

1 I o I Ό 1

Base oil

u

③ 〇 Kinematic viscosity (40 C) mm / s 17.0 1 7.0 1 7.0 1 7.0 1 7.0 16.2 Additive (quality%)

Phosphorous acid 0.2 0.2 0.2 0.2 0.2 0.2 n—decano-mere 1 1 1 1 1

Oleyl alcohol 4 4 4 4 4 4 Alkylated phenyl / 0.2 0.2 0.2 0.2 0.2 Alkylated phenyl

0.3

Naphthylamine

Hindered phenol 0.5

Benzotriazole 0.004 0.004 0.004 0.004 0.004 Alkyl succinate 0.04 0.04 0.04 Shell 4-ball test

0.35 0.35 0.35 0.35 0.35 0.33 (1 圣, mm)

SRV test

0.095 0.095 0.095 0.095 0.095 0.085 Coefficient of friction

Deposit Deposit Deposit Deposit Deposit Deposit Deposit Sludge test

None None None None None None Copper plate corrosion

1 1 1 1 1 (100 ° C x 3 hours)

鲭 None 鲭 None 鲭 None (artificial seawater)

Table 5

Table 6

Table 7

Pug ¹ J

31 32 33 / field

Re

J

¾0¾JS k4U mm / s 1 D. 1 .U 1 /.u

添 ^^ swordι! Π] Ail tan o /

Sadasato% ヽ J

Perinoic acid

Acidic phosphate ester

1 1 1 No

(Poly) glyceryl ether 1 1 1 year old Leyle / Zole 4 1 4 Alkylated diphenylamine 0.2 0.2 0.2 Hensotriazole 0.004 0.004 0.004 Resilosuccinic acid ester 0.04 0.04 0.04 Shell 4-ball test

(0.32 0.32 0.32 mm B1 圣, mm)

SRN / test

0.080 0.080 0.080 Coefficient of friction

Precipitate Precipitate Precipitate Sludge test

1 1 1

| i 10,000 SST King

鲭 None 鲭 None 鲭 None

, Input / Table 8

Example Base oil ①

② o

Kinematic viscosity (40 ° C) mm ² / s 18.2

Additive (% by mass)

Boric acid 0.2

Shell 4 ball test

0.36

Wear diameter, mrru

SRV test

0.1 10

Coefficient of friction Table 9

Example Example Example Example “荬” Example 荬 ^ i // JUi Example 1 Example

35 36 37 38 39 40 Base oil (D 〇

(2) o 〇〇〇 TO No mm / s 17 Π 1 17 /, n リ 17 Π 17 Π 17 n 1 β f W "hn s H l li l, Tetsugai Ri.

| \ ノ ^ n n 9 η U n ク n

Π U 9

, | ^ S "s" 7 1 k 11 1 1 of acid phosphate

1 1 1 Olefin sulfide 1

-4- \ ノ II. "Τ7 I I _ _ J A A

A レ ^! Λ Λ レ f A f A Λ A Alkylated diphenylamine 0.2 0.2 0.2 0.2 0.2 0.2,-, 1 1 1 11 _Λ

Henono Γ * Sonono Nore U.UU't U.UU 'U.UU U.UU U.UU4 U.UU4

0.04 0.04 0.04 0.04 0.04 0.04

0.36 0.34 0.34 0.34 0.34 0.34 Mataka ΐ 圣, mm)

0.1 10 0.100 0.100 0.100 0.100 0.100 Coefficient of friction

Deposit Deposit Deposit Deposit Deposit Deposit Deposit Sludge test

None None None None None None Copper plate corrosion

1 1 1 1 1 1

(100. C x 3 hours)

Mackerel resistance

鲭 None 鲭 None 鲭 None 鲭 None 鲭 None 鲭 None (Artificial seawater)

Table 10

Or ■ y ^ z偷S. I I别Ku 'J heaven ΛΕ 1 click ¹ J or separately

41 4.9

^ J ^ piS. Mm / s o.U I o.U i 1 Oo.nU

; / Young¾¾ iinSi リ l f 暂暑里 (½ / o 、ノ

Phosphorous acid 0.2 0.2 0.2 、, 1: 七 "r r r r r r r r r

Polyalkylene glycol 1

1 song nore "^ noreguchi | S swordsmith 1 no alkylated diphenylamine 0.2 0.2 0.2>,, i, il

Henosotori / Sorenore 0.004 0.004 0.004 Noreki Reconic acid acid salt 0.04 0.04 0.04

, one eight

Nell 4 balls s-type test

0.34 0.34 0.34 Wear diameter (mm)

SRV language test

0.100 0.100 0.100 Coefficient of friction

Precipitate Precipitate Precipitate Sludge test

None None None Copper plate corrosion

1 1 1

(100 ° C x 3 hours)

Protection

Without ho 鲭 Without mackerel (artificial seawater)

Table 11

As described above, the lubricating oil composition of the present invention has excellent abrasion resistance, a low coefficient of friction for a long period of time, and heat resistance because the inorganic acid that is solid at room temperature is dispersed or dissolved in the base oil. It can be seen that there is. Industrial applicability

The lubricating oil composition of the present invention is excellent in abrasion resistance, can maintain a low friction coefficient for a long time, and can have strong heat resistance.

Claims

The scope of the claims

1. A lubricating oil composition comprising a base oil and a solid inorganic acid dispersed or dissolved at room temperature.

2. The lubricating oil composition according to claim 1, wherein the inorganic acid is a phosphorus-based inorganic acid.

3. The phosphorus-based inorganic acid is at least one selected from phosphorous acid, hypophosphorous acid, pyrophosphoric acid, pyrophosphorous acid, polyphosphoric acid, metaphosphoric acid, phosphoric acid, and salts thereof. 3. The lubricating oil composition according to range 2.

4. The lubricating oil composition according to claim 1, wherein the inorganic acid is a boron-based inorganic acid.

5. The lubricating oil composition according to claim 4, wherein the boron-based inorganic acid is at least one selected from boric acid, boric acid and salts thereof.

6. The lubricating oil composition according to any one of claims 1 to 5, wherein the content ratio of each inorganic acid component is 0.001 to 5% by mass, respectively.

7. The composition according to claim 1, which comprises at least one compound selected from a compound having both a nonpolar group and a polar group, and a compound having a nonpolar group dissolved in a base oil and having a weak bond-forming ability with an inorganic acid. 7. The lubricating oil composition according to any one of ranges 1 to 6.

8. At least one compound selected from monohydric saturated alcohols, monounsaturated alcohols and polyhydric alcohols, which has a nonpolar group dissolved in the base oil and has the ability to form a weak bond with an inorganic acid. The lubricating oil composition according to claim 7, which is:

9. 0.05 to 20% by mass of monohydric saturated alcohol and 0.05 to 40% by mass of monounsaturated alcohol. /. 9. The lubricating oil composition according to claim 8, wherein the polyhydric alcohol is contained at a content of 0.05 to 40% by mass.

10. An inorganic acid and at least one compound selected from a compound having both a nonpolar group and a polar group, and a compound having a nonpolar group dissolved in a base oil and having a weak bond-forming ability with an inorganic acid. A lubricating oil composition comprising a reaction intermediate of

11. A lubricating oil composition characterized by containing a reaction intermediate of at least one selected from monohydric saturated alcohols, monounsaturated alcohols and polyhydric alcohols with an inorganic acid.

12. The lubricating oil composition according to any one of claims 1 to 11, comprising a wear inhibitor or a friction modifier.

13The anti-wear or friction modifier is phosphate ester, phosphite ester, acid phosphate ester, acid phosphate amine salt, thiophosphate, thiophosphate, olefin sulfide, polysulfide, Zn dithiophosphate, 13. The lubricating oil composition according to claim 12, wherein the lubricating oil composition is at least one selected from Mo dithiophosphate, Mo dithiocarbamate, and (poly) glyceryl ether.

14. The lubricating oil composition according to claim 12, wherein the content of the antiwear agent or the friction modifier is 0.01 to 5% by mass for each of the various antiwear agents or various friction modifiers. object.

15. The lubricating oil composition according to any one of claims 1 to 14, comprising an antioxidant.

16. The lubricating oil composition according to claim 15, wherein the antioxidant is at least one selected from alkylated diphenylamine, alkylated phenyl-a-naphthylamine and hindered phenols.

17. alkylated diphenylamine is 0.05 to 2 mass ⁰ /. The lubricating oil composition according to claim 16, wherein the alkylated phenyl mono-α-naphthylamine is contained in a content of 0.05 to 2% by mass, and the hindered phenols are contained in a content of 0.05 to 2% by mass.

18. The lubricating oil composition according to any one of claims 1 to 17, comprising a metal deactivator and a deterrent.

19. The lubricating oil composition according to claim 18, wherein the metal deactivator and the inhibitor are at least one selected from benzotriazole and its derivatives and alkylsuccinic acid derivatives.

20. Benzotriazole and its derivatives are contained in a content of 0.01 to 0.05% by mass, and the alkylsuccinic acid derivative is contained in a content of 0.01 to 0.3% by mass. The lubricating oil composition according to the above.

21. Production of a lubricating oil composition characterized by heating in a base oil to a temperature at which a solid inorganic acid can be dispersed or dissolved at room temperature to disperse or dissolve the inorganic acid in the base oil. Method.

22. Ability to form a weak bond between an inorganic acid that is solid at room temperature in a base oil, a compound having both a non-polar group and a polar group, and a non-polar group dissolved in a base oil and an inorganic acid A lubricating oil composition characterized by heating at least one compound selected from the group consisting of: Construction method.

23. The compound having a nonpolar group dissolved in the base oil and having the ability to form a weak bond with an inorganic acid is at least one selected from a monohydric saturated alcohol, a monounsaturated alcohol and a polyhydric alcohol. The method for producing a lubricating oil composition according to claim 22, which is a seed.

24. At least one kind of inorganic acid that is solid at room temperature and at least one compound that has a non-polar group soluble in base oil and has the ability to form a weak bond with the inorganic acid is mixed in advance and the reaction between them A method for producing a lubricating oil composition, comprising: producing a reaction intermediate by heating to a temperature at which a body can be produced; and mixing and dissolving the reaction intermediate in a base oil.

25. The compound having a nonpolar group dissolved in the base oil and having the ability to form a weak bond with an inorganic acid is selected from polyalkylene glycolone, polyphenol ether and partial ester of polyhydric alcohol. 25. The method for producing a lubricating oil composition according to claim 24, which is at least one kind.