JPH0570785A - Lubricating oil composition - Google Patents

Abstract

PURPOSE:To provide the title composition which can remarkably improve the abrasion resistance in machinery and equipment having a wearing part made of aluminum material and is excellent for reducing the weight of an automobile, for a refrigerator, etc. CONSTITUTION:A lubricating oil composition for machinery and equipment having aluminum material for the wearing part, which is obtained by incorporating 0.01-5.0wt.% sulfur compound additive into a mineral oil and/or synthetic oil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil composition having excellent antiwear properties, and more particularly to a lubricating oil composition suitable for use in equipment / devices having an aluminum material at the wear site.

[0002]

2. Description of the Related Art In the automobile industry, there is a tendency toward fuel saving and weight reduction, and aluminum materials have begun to be used in engines and the like, and also in refrigerating machines and the like, aluminum materials have been used in wear parts thereof.

For example, in refrigerating machines, R11 (CCl ₃ F), R12 (CCl ₂ F ₂ ), R123 (CF ₃ CHC) are conventionally used as refrigerants.
Chlorine-containing refrigerants such as l ₂ ), R22 (CHClF ₂ ) are used, but the development of alternative CFCs has become urgent, and non-chlorine fluorine-containing refrigerants such as 1.1.1.2-tetrafluoroethane (R134a) have attracted attention. Is beginning to be done.

Since the chlorine-containing refrigerant itself may have abrasion resistance, it is not necessary to give special consideration to abrasion resistance. However, when a chlorine-free fluorine-containing refrigerant is used, there is no anti-wear property, and particularly when an aluminum material is used at the site of wear, it is required to provide a lubricating oil composition having excellent anti-wear properties.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a lubricating oil composition having excellent wear preventive properties in an equipment / apparatus having an aluminum material at a wear site.

[0006]

The lubricating oil composition of the present invention is a lubricating oil composition for equipment and devices having an aluminum material in a worn portion, and a sulfur-based additive is added to mineral oil and / or synthetic oil. It is characterized in that 0.01 wt% to 5.0 wt% is added.

Further, the lubricating oil composition of the present invention is a lubricating oil composition for equipment / devices having an aluminum material in a worn portion, wherein a sulfur-based additive is added to mineral oil and / or synthetic oil in an amount of 0.01
% To 5.0% by weight and the epoxy group-containing compound is 0.
It is characterized in that 1% by weight to 10% by weight is added.

The base oil in the lubricating oil composition of the present invention will be described below.

Mineral oils include 60 neutral oil, 100 neutral oil, and 15 neutral oil obtained by solvent refining or hydrogenating refining.
There are 0 neutral oil, 300 neutral oil, 500 neutral oil, etc. and low pour point base oil etc. that have improved low temperature fluidity by removing wax from these base oils.
These may be used alone or as a mixture in an appropriate ratio.

Examples of synthetic oils include polyol esters, polyolefins, dialkylbenzenes, polyalkylene glycols and alkyldiphenyl ethers.

First, examples of the polyol ester include organic carboxylic acid esters of the following types.

(1) First, there are polyesters of an aliphatic polyhydric alcohol and a linear or branched fatty acid.

Examples of the aliphatic polyhydric alcohol forming the polyesters include trimethylolpropane, ditrimethylolpropane, trimethylolethane, ditrimethylolethane, pentaerythritol, dipentaerythritol and tripentaerythritol, and the fatty acid. Can have 3 to 12 carbon atoms, preferred fatty acids are propionic acid, butyric acid, valeric acid,
Hexanoic acid, octanoic acid, nonanoic acid, decanoic acid, dodecanoic acid, isovaleric acid, neopentanoic acid, 2-methylbutyric acid,
2-ethylbutyric acid, 2-methylhexanoic acid, 2-ethylhexanoic acid, isooctanoic acid, isononanoic acid, isodecanoic acid, 2,2′-dimethyloctanoic acid, 2-butyloctanoic acid and the like.

Further, partial esters of an aliphatic polyhydric alcohol and a linear or branched fatty acid can also be used.

As the aliphatic polyhydric alcohol, trimethylolpropane, ditrimethylolpropane, trimethylolethane, ditrimethylolethane, pentaerythritol, dipentaerythritol, tripentaerythritol and the like can be used. Fatty acids having 3 to 9 carbon atoms, such as propionic acid, butyric acid, valeric acid,
Hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, 2-
Examples thereof include methylhexanoic acid, 2-ethylhexanoic acid, isooctanoic acid, isononanoic acid, isodecanoic acid, 2,2′-dimethyloctanoic acid and 2-butyloctanoic acid.

As the esters of these aliphatic polyhydric alcohols and linear or branched fatty acids, particularly preferred are pentaerythritol, dipentaerythritol, tripentaerythritol and C5-12, more preferably carbon. Fatty acids of several 5 to 7, for example, valeric acid, hexanoic acid, heptanoic acid, 2-methylhexanoic acid, 2-ethylhexanoic acid, isooctanoic acid, isononanoic acid, isodecanoic acid, 2,2'-dimethyloctanoic acid, 2-butyl Esters from octanoic acid, or mixtures thereof.

These partial esters can be obtained by reacting the aliphatic polyhydric alcohol and the fatty acid by appropriately adjusting the reaction mole number.

(2) Neopentyl glycol as an aliphatic polyhydric alcohol and a linear or branched fatty acid having 6 to 9 carbon atoms such as hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, 2-ethylbutyric acid, It is also possible to use diesters with 2-methylhexanoic acid, 2-ethylhexanoic acid, isooctanoic acid, isononanoic acid and the like.

(3) Aliphatic polyhydric alcohol and carbon number 3 to
Partial esters with a linear or branched fatty acid of 9,
It is also possible to use complex esters with linear or branched aliphatic dibasic acids or aromatic dibasic acids.

Examples of such aliphatic polyhydric alcohols include trimethylolpropane, trimethylolethane,
Pentaerythritol, dipentaerythritol and the like can be used.

The fatty acids having 3 to 12 carbon atoms include propionic acid, butyric acid, isobutyric acid, valeric acid, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, dodecanoic acid,
2-Methylhexanoic acid, 2-ethylhexanoic acid, isooctanoic acid, isononanoic acid, isodecanoic acid, 2,2'-dimethyloctanoic acid, 2-butyloctanoic acid and the like can be used.

In this complex ester, preferably a fatty acid having 5 to 7 carbon atoms, more preferably 5 to 6 carbon atoms is used.

As such a fatty acid, valeric acid, hexanoic acid, isovaleric acid, 2-methylbutyric acid, 2-ethylbutyric acid or a mixture thereof are used, and those having 5 carbon atoms and 6 carbon atoms are used.
Fatty acids obtained by mixing these in a weight ratio of 10:90 to 90:10 can be preferably used.

As the aliphatic dibasic acid used for esterification with polyhydric alcohol together with this fatty acid, succinic acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid and dodecane are used. Diacid,
It is recommended to use tridecanedioic acid, carboxyoctadecanoic acid, carboxymethyloctadecanoic acid, docosanedioic acid, etc. Also, as the aromatic dibasic acid, phthalic acid, isophthalic acid, and aromatic tribasic acid, trimellitic acid, aromatic Examples of the tetrabasic acid include pyromellitic acid.

The ratio of the fatty acid to the aliphatic dibasic acid or the aromatic dibasic acid, the aromatic tribasic acid or the aromatic tetrabasic acid may be 6: 1 (molar ratio). In this case, the ratio of the total amount of the fatty acid, the aliphatic dibasic acid or the aromatic dibasic acid, and the amount of the aliphatic polyhydric alcohol used may be 7: 1 (molar ratio).

In the esterification reaction, first, a polyhydric alcohol is reacted with an aliphatic dibasic acid or an aromatic dibasic acid at a predetermined ratio to partially esterify it, and then the partially esterified product is reacted with a fatty acid. Alternatively, the reaction order of the acids may be reversed, or the acids may be mixed and subjected to esterification.

(4) Further, linear or branched dialkyl esters of aliphatic dibasic acids (having 16 to 22 carbon atoms) may be used.

Examples of the aliphatic dibasic acid include succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, carboxyoctadecane acid, and carboxymethyloctadecane. Acids, docosandioic acid, and those having properties equivalent to these are mentioned. Preferred aliphatic dibasic acids are succinic acid, adipic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, carboxyoctadecanoic acid, carboxymethyloctadecanoic acid and the like.

The alcohol component is an alcohol having 5 to 8 carbon atoms, specifically amyl alcohol, hexyl alcohol, heptyl alcohol and octyl alcohol, and isomers thereof, preferably isoamyl alcohol and isohexyl alcohol. And octyl alcohol.

Specifically, dioctyl adipate, di-
Examples include isoheptyl adipate, dihexyl sebacate, diheptyl succinate and the like.

(5) Dialkyl esters of aromatic dibasic acids (having 18 to 26 carbon atoms) can also be used.

Examples of the aromatic dibasic acid include phthalic acid, isophthalic acid and the like, and the alcohol component in the dialkyl ester has 5 carbon atoms.
~ 8 alcohols, including amyl alcohol, hexyl alcohol, heptyl alcohol, octyl alcohol, and isomers thereof. Preferred alcohols include isoamyl alcohol, isoheptyl alcohol and octyl alcohol. Aromatic diesters include dioctyl phthalate, diisoheptyl phthalate, diisoamino phthalate and the like.

(6) As alcohol components, monohydric alcohols selected from methanol, ethanol, propanol, butanol, etc., and isomers thereof, trihydric alcohols such as glycerin, trimethylolpropane, and ethylene oxide, propylene oxide, etc. 1 mol to 1 of alkylene oxide selected from butylene oxide, amylene oxide, etc., and isomers thereof.
0 mol, preferably 1 to 6 mol of adduct is used.

As the organic carboxylic acid ester, an alkylene oxide adduct of a monohydric alcohol is adipic acid,
Pimelic acid, suberic acid, azelaic acid, sebacic acid,
There are diesters obtained by esterification with an aliphatic dibasic acid such as undecanedioic acid, dodecanedioic acid, carboxyoctadecanoic acid, carboxymethyloctadecanoic acid, docosandioic acid, or an aromatic dibasic acid such as phthalic acid.

Further, 1 to 10 of alkylene oxides of polyhydric alcohols such as glycerin and trimethylolpropane are used.
The molar adduct is a linear or branched fatty acid having 3 to 12 carbon atoms, for example, propionic acid, butyric acid, valeric acid, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, dodecanoic acid, 2-methyl. Hexanoic acid, 2-ethylhexanoic acid, isooctanoic acid, isononanoic acid, isodecanoic acid,
Esters obtained by esterification with 2,2′-dimethyloctanoic acid, 2-butyloctanoic acid or the like can be used.

As the fatty acid constituting the above organic carboxylic acid ester, a linear or branched fatty acid can be used, but the branched fatty acid is more excellent in hydrolysis stability.

The above-mentioned organic carboxylic acid ester may be used alone, but in order to adjust the viscosity range according to the above-mentioned various uses, it is preferable to use the above organic carboxylic acid ester in appropriate combination.

For example, in the case of the complex type organic carboxylic acid ester of (3) above, where the viscosity is high, an ester oil of an aliphatic polyhydric alcohol and a fatty acid having 3 to 9 carbon atoms at 100 ° C. It is possible to adjust the viscosity range according to the application by adding a substance having a viscosity of 6 mm ² / s or less. When the viscosity is low, the polymers may be added to the organic carboxylic acid ester oil to adjust the viscosity. The polymer preferably has a viscosity at 100 ° C. of 10 mm ² / s or more.

Examples of such a polymer include polyalkylmethacrylate (for example, an alkyl group having 4 to 8 carbon atoms).
), Polyalkylene glycol (for example, polypropylene glycol, a copolymer composed of a polyethylene glycol component and a polypropylene glycol component, a copolymer composed of a polypropylene glycol component and a polytetramethylene glycol component, etc.), neopentyl glycol and a fat. Group II dibasic acid polyesters represented by the following formula

[0040]

[Chemical 1]

And the like.

The amount of the polymer added is not particularly limited as long as an ester oil having a desired viscosity can be obtained,
Usually, it can be in the range of 1% by weight to 99% by weight.

Next, the polyolefins have a branch having 2 to 14 carbon atoms, preferably 4 to 12 carbon atoms.
Alternatively, it is obtained by any one kind of homopolymer selected from olefinic hydrocarbons having no or a copolymer of two or more kinds, and is selected from products having an average molecular weight of 100 to about 2000, preferably 200 to about 1000. However, it is particularly preferable that the unsaturated bond is removed by hydrogenation.

Preferred polyolefins include, for example, polybutene, α-olefin oligomer, ethylene / α
-Olefin oligomers and the like. As the polybutene, for example, one obtained mainly by isobutene and obtained by copolymerizing a monomer mixture of butene-1 and butene-2 is preferable. Further, as the α-olefin oligomer, an α-olefin mixture having 6 to 12 carbon atoms obtained by thermal decomposition of hydrocarbon or trimerization to hexamerization of lower olefin,
For example, 25% to 50% by weight of hexene-1, 30% to 40% by weight of octene-1 and 25% of decene-1.
A copolymer of a mixture of 40% by weight to 40% by weight can be used. An oligomer obtained from a single monomer such as decene is also suitable. Further ethylene / α-
As olefin oligomer, 40% by weight of ethylene
~ 90 wt%, 1 alpha-olefin, for example propylene
It is possible to use the one obtained by mixing and polymerizing the monomers in the proportion of 0% by weight to 60% by weight.

These polyolefins can be produced by using Friedel-Crafts type catalysts such as aluminum chloride and boron fluoride, Ziegler catalysts and oxide catalysts such as chromium oxide. The hydrogenation of the polyolefin can be carried out by removing the catalyst from the reaction product and then contacting it with a hydrogenation catalyst such as nickel-molybdenum / alumina under heating and pressurization.

Alkylbenzene is mainly of the alkylbenzene type, and is mainly dialkylated, which is a by-product when an aromatic hydrocarbon such as benzene or toluene is alkylated by a Friedel-Crafts reaction or the like to produce a detergent raw material. It is an oil containing aromatic hydrocarbons. As the alkyl group, either linear or branched ones belong to this group.

The polyalkylene glycol has an alkylene group having 2 to 5 carbon atoms, preferably 2 to 3 carbon atoms.
Is a ring-opening polymer or ring-opening copolymer of the linear or branched alkylene oxide. The alkylene oxide is ethylene oxide, propylene oxide, butylene oxide, or a mixture thereof, preferably propylene oxide, preferably polyethylene glycol or polypropylene glycol, and having a molecular weight range of 100 to 2000, preferably 2
It is the thing of 00-1000.

Examples of the alkyl diphenyl ether include monoalkyl diphenyl ether, dialkyl diphenyl ether, and trialkyl diphenyl ether synthesized by alkylating diphenyl ether using the Friedel-Crafts reaction or the like, and the alkyl group is linear and / or Any of the branches may be used.

These mineral oils and synthetic oils may be used alone or as a mixture. Preferably synthetic oils are used. The viscosity range is 10 to 50 at 40 ° C.
0 mm ² / s, preferably 20~460mm ² / s.

The lubricating oil composition of the present invention is used in equipment / apparatus having an aluminum material at the wear site. When a sulfur-based additive is added to the above mineral oil and / or synthetic oil as a base oil, other wear It has been found that the anti-wear property is particularly superior to the anti-wear agent.

Examples of sulfur additives include sulfides such as diphenyl sulfide, diphenyl disulfide, di-n-butyl sulfide, di-n-butyl disulfide, di-tert-dodecyl disulfide, di-tert-dodecyl trisulfide, and thiazoles. , Thiadiazoles, sulfurized olefins, sulfurized esters, sulfurized spalm oil, sulfurized dipentene, and other sulfurized fats and oils,
Thiocarbonates such as xanthic disulfide,
Examples include zinc thiophosphates such as zinc primary alkylthiophosphates, zinc secondary alkylthiophosphates, zinc alkyl-allylthiophosphates and zinc allylthiophosphates, and sulfonates such as sodium sulfonates.

Further, the following general formulas (1) to (6) have the following structures, and an additive containing at least one of them is given.

[0053]

[Chemical 2]

(In the formula, R _{1 to} R ₄ are hydrogen or a carbon number of 1
To 20 monovalent hydrocarbon groups, preferably linear or branched alkyl groups, aryl groups, aralkyl groups, araryl groups, and halogenated hydrocarbon groups as the hydrocarbon groups, and R _{5 to} R ₇ are carbon atoms. A divalent hydrocarbon group of the formulas 1 to 6, preferably a linear or branched alkyl group, aryl group, aralkyl group, araryl group or halogenated hydrocarbon group, wherein X _{1 to} X ₄ and Y are oxygen atoms Or a sulfur atom, at least one of which is a sulfur atom, and R ₁ to
R ₄ may be directly bonded to a phosphorus atom without passing through Y, and n represents an integer of 0 to 2, but when n is 0, X is
₂ and X ₃ both represent a sulfur atom. ) And bisthiophosphoric acid ester-based or bisdithiophosphoric acid ester-based additives.

The bisthiophosphoric acid ester system includes X ₁ , X ₂ , X
_In the case where 1 to 3 of 4 of ₃ and X ₄ are oxygen atoms and the rest are sulfur atoms, the bisdithiophosphate ester system is X ₁ , X 4.
_This is the case where ₂ , X ₃ and X ₄ are all sulfur atoms.

Further, as the bisthiophosphoric acid ester-based or bisdithiophosphoric acid ester-based additives, those represented by the following general formulas (2), (3) and (4) are also effective.

[0057]

[Chemical 3]

(Wherein R _{1 to} R ₇ , X _{1 to} X ₄ , Y and n
Shows the same contents as in the general formula (1). )

[0059]

[Chemical 4]

(In the formula, R _{1 to} R ₄ are hydrogen or a carbon number of 1
To 20 monovalent hydrocarbon groups, preferably linear or branched alkyl groups, aryl groups, aralkyl groups, araryl groups, and halogenated hydrocarbon groups as the hydrocarbon groups, and R ₅ and R ₆ are carbon atoms. A divalent hydrocarbon group of the formulas 1 to 6, preferably a linear or branched alkyl group, aryl group, aralkyl group, araryl group or halogenated hydrocarbon group, wherein X _{1 to} X ₄ and Y are oxygen atoms Or a sulfur atom, at least one of which is a sulfur atom, and R ₁ to
R ₄ may be directly bonded to a phosphorus atom without interposing Y, and n represents an integer of 0 to 2. )

[0061]

[Chemical 5]

(In the formula, R ₁ and R ₂ are hydrogen and have ₁ to ₂ carbon atoms.
A monovalent hydrocarbon group of 0, R ₈ is a hydrocarbon group having 1 to 20 carbon atoms and having at least one ester bond, X ₁ , X
₂ and Y are oxygen atoms or sulfur atoms, at least one of which is a sulfur atom. ) Further, in the general formula (5) (RY) ₃ -P = X _a (wherein X and Y are sulfur atoms or oxygen atoms, at least one of which is a sulfur atom, a is 0 or 1, and R is hydrogen,
Or a hydrocarbon group having 1 to 20 carbon atoms, preferably a linear or branched alkyl group, aryl group, aralkyl group, araryl group, or halogenated hydrocarbon group, which may be the same or different. .. The compounds shown in () are also effective.

Specific examples of the compound represented by the general formula (5) include:

[0064]

[Chemical 6]

Specific compounds are shown below.

Examples of the compound represented by the above structural formula (1) include triarylphosphorothionate and the like, for example, triphenylphosphorothionate and alkyldiarylphosphorothionate.

As the compound represented by the structural formula (4),
Examples include trilauryl thiophosphite.

In the general formula (6), R ₃ —Y _b —P═X _a (wherein, X and Y are sulfur atoms or oxygen atoms, at least one of which is a sulfur atom, and a is 0 or 1, b). Is 0-2
, R is hydrogen, or a hydrocarbon group having 1 to 20 carbon atoms,
The hydrocarbon group is preferably a linear or branched alkyl group, an aryl group, an aralkyl group, an araryl group or a halogenated hydrocarbon group, which may be the same or different. The compounds shown in () are also effective.

Specific examples of the compound represented by the general formula (6) include:

[0070]

[Chemical 7]

The following are mentioned.

In addition,

[0073]

[Chemical 8]

[0074]

The sulfur-based additive may be used in an amount of 0.01% by weight to 5% by weight, preferably 0.1% by weight to 3% by weight, based on the mineral oil and / or the synthetic oil. The above-mentioned sulfur-based additives may be used alone, or may be used in a combination of two or more kinds represented by the above general formulas, or two or more kinds represented by the general formulas.

Of these sulfur-based additives, sulfides, thiazole-based compounds, thiadiazole-based compounds, sulfurized olefins, sulfurized esters, sulfurized fats and oils, zinc thiophosphates, and additives represented by the general formulas 1 to 4 are preferable. Is.

An antioxidant may be further added to the lubricating oil composition of the present invention. Examples of this kind of antioxidant include di (alkylphenyl) amine (alkyl has 4 to 16 carbon atoms), phenyl-α-naphthylamine,
Alkyldiphenylamine (alkyl has 4 to 1 carbon atoms)
6), N-nitrosodiphenylamine, phenothiazine, N, N'-dinaphthyl-p-phenylenediamine,
Acridine, N-methylphenothiazine, N-ethylphenothiazine, dipyridylamine, diphenylamine,
Amine-based antioxidants such as phenolamine, 2,6-di-t-butyl-α-dimethylaminoparacresol,
2.6-di-t-butylparacresol, 4.4'-methylenebis (2.6-di-t-butylphenol),
2,6-di-t-butyl-4-N, N-dimethylaminomethylphenol, phenolic antioxidants such as 2.6-di-t-butylphenol, iron octoate, ferrocene, Organometallic compound-based antioxidants such as organic iron salts such as iron naphthoate, organic cerium salts such as cerium naphthoate and cerium toluate, organic zirconium salts such as zirconium octoate are preferably used. Further, the above antioxidants may be used alone, or may be used in combination of two or more so as to exert a synergistic effect.

The above-mentioned antioxidant is used in an amount of 0.001 to 5% by weight, preferably 0.01 to 2% by weight, based on the mineral oil and / or synthetic oil.

Further, the lubricating oil composition of the present invention contains various kinds of water / acid scavengers, detergent dispersants, corrosion inhibitors, defoamers, metal deactivators, rust preventives, etc., depending on the application. Additives should be added.

For example, when it is used as a refrigerating machine oil, a water / acid scavenger, a corrosion inhibitor, a defoaming agent, a metal deactivator, and a rust preventive may be added, and it is also used as a gear oil. In this case, an antiwear agent, a viscosity index improver, a metal deactivator, and a corrosion inhibitor may be added.

Hereinafter, such additives will be described.

For example, acetals, glycidyl ethers, epoxidized fatty acid esters, glycidyl fatty acid esters, and glycidyl can be used as lubricating oil compositions for use in equipment such as refrigerating machine oil that needs to trap water and acids. A polyoxyalkylene oxide derivative of ether or the like is added.

First, examples of acetals include dialkyl acetals, diphenyl acetals, dialkenyl acetals and diallyl acetals.

As the glycidyl ether, phenyl or alkylphenyl glycidyl ether, n-
Examples thereof include butyl glycidyl ether, and a condensate of epichlorohydrin and bisphenol. As the alkyl phenyl glycidyl ether, one having 1 to 3 C _{4 to} C ₁₈ alkyl groups, and particularly one having 1 C _{5 to} C ₁₀ alkyl group is preferable. The condensate of epichlorohydrin and bisphenol is preferably, for example, one obtained by condensing bisphenol A and epichlorohydrin in an alkaline solution.

Further, examples of the epoxidized fatty acid esters include esters of epoxidized C _{12 to} C ₂₀ fatty acids with C _{1 to} C ₈ alcohols, phenols, or alkylphenols, and particularly butyl and hexyl epoxystearate. , Benzyl, cyclohexyl, methoxyethyl, octyl, phenyl, and t-butylphenyl ester.

These additives are added to the total amount of the composition.
It is advisable to add 0.1 to 10% by weight, preferably 0.5 to 3% by weight.

Examples of the detergent dispersant include succinimide, alkylbenzene sulfonate and the like.

As the corrosion inhibitor, isostearate, n-octadecyl ammonium stearate, duomin T.deolate, lead naphthenate, sorbitan oleate, pentaerythritol oleate, oleylsarcosine, alkylsuccinic acid, alkenylsuccinic acid. , And their derivatives, etc., and their use ratio is 0.001 to 1.0% by weight, preferably 0.01 to 0.
It is recommended to use 5% by weight.

As the defoaming agent, it is preferable to use silicone, and the ratio of its use is 0.0001 to 0.
003% by weight, preferably 0.0001 to 0.001% by weight may be used.

As the metal deactivator, for example, benzotriazole, benzotriazole derivative, thiadiazole, thiadiazole derivative, triazole, triazole derivative, dithiocarbamate, etc. may be used, and the use ratio thereof is 0 relative to the base oil. 0.01% by weight to 1
It is advisable to use 0% by weight, preferably 0.01% to 1.0% by weight.

Further, as a rust preventive, for example, succinic acid, succinic acid ester, oleic acid tallow amide, barium sulfonate, calcium sulfonate, etc. may be used.
The use ratio thereof is 0.01% by weight to 10% by weight, preferably 0.01% by weight to 1.0% by weight.

Next, the viscosity range of the lubricating oil composition of the present invention will be described.

The viscosity range of the lubricating oil composition of the present invention is 40
10 to 500 mm ² / s at ℃, preferably 20 to 48
It is 0 mm ² / s. For example, refrigerator oil, especially for refrigerators, usually has a viscosity of 2 mm ² / s to 9 mm at 100 ° C.
² / s, and preferably of ^{3mm 2 / s ~7mm 2 / s} ,
In addition, if as is for the car air conditioner to use one of 7mm ² / s ~30mm ² / s well, 7mm ² / s ~15mm in the reciprocating type of compressors even in the car air conditioner ² /
s, preferably ^{8mm 2 / s ~11mm 2 / s} , a rotary type compressor 15mm ² / s ~30mm ² / s
, Preferably an ester oil having a viscosity range of 20mm ² / s ~27mm ² / s is preferably used. If the viscosity range is less than 2 mm ² / s, the compatibility with the refrigerant at high temperature is high, but the viscosity is too low, the lubricity and sealing properties are poor, and the thermal stability is low. Further, if it exceeds 30 mm ² / s, the compatibility with the refrigerant decreases, which is not preferable. Even within this range, the viscosity range used differs depending on the model used, as described above, and for refrigerators it is 9 mm ² /
If it exceeds s, there is a problem that the friction loss in the sliding portion becomes large. Further, in the reciprocating type car air conditioner, if it is less than 7 mm ² / s, there is a problem of lubricity, and if it exceeds 15 mm ² / s, there is a problem that the friction loss in the sliding portion is large, and in the rotary type air conditioner. Is 15
mm ² / s is less than that there is a problem of the sealing properties, 30 mm ² /
If it exceeds s, there is a problem of compatibility with the refrigerant.

When the lubricating oil composition of the present invention is used as a gear oil, it may be prepared to have a viscosity of ²⁰ to 480 mm ² / s at 40 ° C.

[0095]

The lubricating oil composition of the present invention comprises a mineral oil and / or a synthetic oil containing 0.01% by weight of a sulfur-based additive.
It is prepared by adding 5.0% by weight. Compared with the case where cast iron is used as the wear site, for example, when the wear site is made of an aluminum material, the detailed reason is unknown, but the wear resistance is remarkably increased. A lubricating oil composition for an apparatus / device having an aluminum material in a worn portion, for example, a refrigerator oil, a gear oil, an engine oil, a hydraulic oil, a compression in a refrigerator, a car air conditioner, etc. It can be used as an excellent composition for machine oil, sliding surface oil, metalworking oil, etc.

The present invention will be described below with reference to examples.

[0097]

Example 1 An ester of dipentaerythritol and a C _{5 to} C ₆ fatty acid (C ₅ component 30% by weight, C ₆ component 70% by weight), which comprises dipentaerythritol and C _{5 to} C ₆
0.20% by weight of di (octylphenyl) amine as an antioxidant, 2,6-, with respect to the one obtained by reacting a fatty acid in a molar ratio of 1: 6 [viscosity 72 mm ² / s, 40 ° C.].
Sample oil 1 to sample oil 4 were prepared by adding 0.10% by weight of di-t-butyl-4-N, N-dimethylaminomethylphenol and further adding the sulfur-based additives shown in the following table in respective proportions. Was prepared.

For each of the sample oils, as an evaluation of lubricity, an SRV vibration friction wear test was carried out under the following conditions.

SRV Vibration Friction and Wear Test Conditions Specimen: 10 mmφ steel ball (SUJ2) / aluminum plate (A390) Oil temperature: 120 ° C Stroke: 2.5 m / m Load: 25 N Frequency: 15 Hz Time: 30 minutes test The results for the wear width (m / m) of the subsequent aluminum plate are also shown in the table below. In addition, the same test results are shown at the same time as Comparative Oil 1 in which the antiwear agent was not added to the above sample oil, and Comparative Oil 2 in which the phosphorus-based tricresyl phosphate was added as the antiwear agent. ..

[0100]

[Table 1]

As can be seen from the table, the antiwear agent of the present invention exhibits superior antiwear property to the aluminum material as compared with the phosphorus antiwear agent.

[0102]

Comparative Example 1 For each sample oil and comparative oil of Example 1, S
10 mmφ as a test piece in the RV vibration friction wear test
The results of the same tests as in Example 1 using steel balls (SUJ2) / cast iron plate (FC-25) are shown in the table below.

[0103]

[Table 2]

As can be seen from this table, the lubricating oil composition of the present invention has almost no wear preventing effect when the iron material system is present in the wear site, and has an effect only when aluminum is used as the wear site. I understand.

[0105]

Example 2 In the sample oil described in Example 1, sample oils 5 to 8 were prepared by substituting the anti-wear agent as shown in the table below, and the lubricity against an aluminum plate was similarly tested. The results are shown in the table below. Shown at the same time.

[0106]

[Table 3]

As can be seen from the table, the sample oils 5 to 8 are also excellent in the abrasion resistance against the aluminum plate as the sample oils 1 to 4.

[0108]

Example 3 In the sample oil of Example 1, a base oil,
The same antioxidant was used, and the additives shown in the table below were further added to prepare sample oils 9 and 10, and the lubricity of the aluminum plate was tested as in Example 1. The results are also shown in the table below.

[0109]

[Table 4]

[0110]

Example 4 In the sample oil of Example 1, the base oil was changed as follows, an antioxidant was added in the same manner as in Example 1, and 2- (mercapto) -benzothiazole was added as an antiwear agent. Each sample oil was prepared by adding 0.10% by weight, and the results of testing the lubricity for an aluminum plate in the same manner as in Example 1 are shown in the table below at the same time.

[0111]

[Table 5]

As can be seen from the table, the present invention is effective even when other synthetic oil is used as the base oil.

[0113]

COMPARATIVE EXAMPLE 2 In the sample oils 14 to 18 of Example 4, no additives other than the antioxidant were added, and the comparative oil 3 was used.
7 to 7 were prepared and tested for lubricity on an aluminum plate in the same manner as in Example 1, and the results are shown in the table below.

[0114]

[Table 6]

As can be seen from the table, the comparative oils 3 to 7 are lower in abrasion resistance than the sample oils 14 to 18.

[0116]

Comparative Example 3 A comparative oil was prepared by using the same base oil and antioxidant as in Example 1 and the additives shown in the table below were added to prepare comparative oils. Tested. The results are also shown in the table below.

[0117]

[Table 7]

As can be seen from the table, even if the anti-wear agent or the additive other than the sulfur type is added, the anti-wear property against the aluminum material is low.

[0119]

Example 5 Sample oil 19 and sample oil 20 were prepared by using the same base oil and antioxidant as in Example 1 and adding the additives shown in the table below, respectively. The aluminum plate was tested for lubricity. The results are also shown in the table below.

[0120]

[Table 8]

As can be seen from the table, the bisdithiophosphoric acid ester-based additive also exhibits excellent antiwear properties against aluminum materials.

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Claims (2)

[Claims] 1. A lubricating oil composition for equipment and devices, comprising an aluminum material in a worn portion, wherein 0.01% by weight to 5.0% by weight of a sulfur-based additive is added to mineral oil and / or synthetic oil. A lubricating oil composition comprising: 2. A lubricating oil composition for equipment and devices, comprising an aluminum material in a worn portion, wherein 0.01% by weight to 5.0% by weight of a sulfur-based additive is added to mineral oil and / or synthetic oil and an epoxy group. A lubricating oil composition, wherein the content of the compound is 0.1% to 10% by weight.