JPH0586387A - Lubricating oil composition - Google Patents

Abstract

PURPOSE:To obtain a lubricating oil composition which is excellent in abrasion preventive properties in a machine and an apparatus having aluminum parts which suffer from abrasion by compounding specific zinc thiophosphate and diphenyl carbonate with a base oil. CONSTITUTION:The objective composition comprises a mineral oil and/or a synthetic oil and, compounded therewith, zinc thiophosphate of formula I and diphenyl carbonate of formula II which are used in a proportion of 1:0.4-1:0.6 (by weight), and in total, at a proportion of 0.1-5% by weight relative to the weight of the mineral oil and/or the synthetic oil. In formula I, R1 to R4 are each independently 4-16C alkyl, aryl, alkenyl, aralkyl or alkylaryl. In formula II, R1 and R2 are each independently hydrogen, 1-20C alkyl, aryl, alkenyl, aralkyl or alkylaryl.

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.

However, the chlorine-containing refrigerant itself may have abrasion resistance, and it is not necessary to give special consideration to abrasion resistance. However, when a chlorine-free fluorine-containing refrigerant is used, There is a need to provide a lubricating oil composition that has no anti-wear property, and particularly has excellent anti-wear property when an aluminum material is used in a worn part.

[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. Mineral oil and / or synthetic oil has the following general formula (1) ) And zinc dithiocarbonate represented by the following general formula (2): 1: 0.4 to 1:
It is characterized in that it is contained in a proportion of 0.6 (weight ratio) and in a total amount of 0.1 to 5% by weight based on the mineral oil and / or the synthetic oil.

[0007]

[Chemical 3]

(Wherein R _{1 to} R ₄ are alkyl groups having 4 to 16 carbon atoms, aryl groups, alkenyl groups, aralkyl groups,
It is an aryl group and may be the same or different. )

[0009]

[Chemical 4]

(In the formula, R ₁ and R ₂ are hydrogen and have ₁ to ₂ carbon atoms.
And an alkyl group, an aryl group, an alkenyl group, an aralkyl group and an araryl group of 0, which may be the same or different. ) The zinc thiophosphate in the lubricating oil composition of the present invention is represented by the above general formula (1), wherein R _{1 to} R
₄ is preferably a butyl group, an n-octyl group, a 2-ethylhexyl group, a lauryl group or the like.

The diphenyl carbonate is represented by the above general formula (2), wherein R ₁ and R ₂ are preferably hydrogen, methyl group, ethyl group, hexyl group, 2-ethylhexyl group, lauryl group and the like. Can be mentioned.

Zinc thiophosphate and diphenyl carbonate are added in an amount of 40 to 6 diphenyl carbonate based on 100 parts by weight of zinc thiophosphate.
0 parts by weight, preferably 45 to 55 parts by weight, is added to the mineral oil and / or synthetic lubricating oil described below, and the amount of diphenyl carbonate is less than 40 parts by weight or more than 60% by weight with respect to zinc thiophosphate. When the amount is large, the wear resistance is poor. The total amount of zinc thiophosphate and diphenyl carbonate added to the mineral oil and / or synthetic lubricating oil may be 0.1 to 5% by weight, preferably 0.3 to 4.5% by weight,
If it is less than 0.1% by weight, the effect is not obtained, and if it exceeds 5% by weight, the abrasion resistance is deteriorated.

The base oil in the lubricating oil composition will be described.

Mineral oils include 60 neutral oils, 100 neutral oils, and 15 neutral oils 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. 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, 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 aliphatic polyhydric alcohol and 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.

The esters of these aliphatic polyhydric alcohols with linear or branched fatty acids are particularly preferably pentaerythritol, dipentaerythritol, tripentaerythritol and carbon atoms of 5 to 12, more preferably carbon atoms. 5 to 7 fatty acids such as valeric acid, hexanoic acid, heptanoic acid, 2-methylhexanoic acid, 2-ethylhexanoic acid, isooctanoic acid, isononanoic acid, isodecanoic acid, 2,2'-dimethyloctanoic acid, 2-butyloctane An ester composed of an acid or a mixture thereof can be used.

These partial esters can be obtained by appropriately adjusting the number of moles of the reaction between the aliphatic polyhydric alcohol and the fatty acid for the reaction.

(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 alcohol 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, it is preferable to use a fatty acid having 5 to 7 carbon atoms, more preferably 5 to 6 carbon atoms.

As such a fatty acid, valeric acid, hexanoic acid, isovaleric acid, 2-methylbutyric acid, 2-ethylbutyric acid, or a mixture thereof is used, which has 5 carbon atoms and 6 carbon atoms.
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 aromatic dibasic acid, aromatic tribasic acid or aromatic tetrabasic acid may be 6: 1 (molar ratio), and the esterification reaction 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).

The esterification reaction is carried out by first reacting a polyhydric alcohol with an aliphatic dibasic acid or an aromatic dibasic acid at a predetermined ratio to partially esterify it, and then reacting the partially esterified product 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 the alcohol component, monohydric alcohols selected from methanol, ethanol, propanol, butanol, etc., and their isomers, 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, the above organic carboxylic acid ester may be appropriately used in combination.

For example, in the case of the complex type organic carboxylic acid ester of the above (3) having a high viscosity, 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.

As such a polymer, a polyalkylmethacrylate (for example, an alkyl group having 4 to 8 carbon atoms) is used.
), 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

[0044]

[Chemical 5]

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 the 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 / or synthetic oils may be used alone or as a mixture. Preferably synthetic oils are used.

[0054] The viscosity range of these mineral oils and / or synthetic oils, 10 to 500 mm ² / s at 40 ° C., preferably from 20~460mm ² / s.

An antioxidant may be added to the lubricating oil composition of the present invention. Examples of this type of antioxidant include di (alkylphenyl) amine (alkyl group having 4 to 16 carbon atoms), phenyl-α-naphthylamine, alkyldiphenylamine (alkyl group having 4 to 16 carbon atoms), N
-Nitrosodiphenylamine, phenothiazine, N,
Amines such as N'-dinaphthyl-p-phenylenediamine, acridine, N-methylphenothiazine, N-ethylphenothiazine, dipyridylamine, diphenylamine, phenolamine, and 2,6-di-t-butyl-α-dimethylaminoparacresol Antioxidant, 2.6-di-t-butylparacresol, 4.4'-methylenebis (2.6-di-t-butylphenol), 2,6-di-
A phenol such as t-butyl-4-N, N-dimethylaminomethylphenol or 2,6-di-t-butylphenol.
-Based antioxidants, organic iron salts such as iron octoate, ferrocene and iron naphthoate, organic cerium salts such as cerium naphthoate and cerium toluate, organic zirconium salts such as zirconium octoate It is preferable to use an organometallic compound-based antioxidant such as 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 proportion of the above-mentioned antioxidant used is 0.001 to 5% by weight, preferably 0.01 to 2% by weight based on the synthetic oil.
It is advisable to use% by weight.

Further, the lubricating oil composition of the present invention contains an antiwear agent, a water / acid scavenger, a detergent / dispersant, a corrosion inhibitor, an antifoaming agent, a metal deactivator, an anticorrosive agent, depending on its use. It is advisable to add various additives such as agents.

For example, when it is used as a refrigerating machine oil, an antiwear agent, a water / acid scavenger, a corrosion inhibitor, a defoaming agent, a metal deactivator, an anticorrosive agent, etc. may be added. When used as oil, anti-wear agent, metal deactivator,
It is preferable to add a viscosity index improver and the like.

Hereinafter, such additives will be described.

Acetals can be used in the case of using an ester oil as a synthetic lubricating oil, or in a lubricating oil composition used in equipment such as refrigerating machine oil which needs to prevent the generation of water and acid. , Glycidyl ether, epoxidized fatty acid esters, glycidyl fatty acid esters, polyoxyalkylene oxide derivatives of glycidyl ether, etc. are 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 especially 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.

Further, as a corrosion inhibitor, isostearate, n-octadecyl ammonium stearate, duomin T.deolate, lead naphthenate, sorbitan oleate, pentaerythritol oleate, oleyl sarcosine, 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.

Silicone may be used as the defoaming agent, and the proportion of the defoaming agent used 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 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 ° C.
At 10 to 500 mm ² / s, preferably 20 to 48
It is 0 mm ² / s.

For example, refrigerating machine oil, especially for refrigerators, usually has a viscosity at 100 ° C. of 2 mm ² / s to 9 mm.
² / s, and preferably of ^{3mm 2 / s ~7mm 2 / s} ,
Also, 7mm as lubricating oil for refrigerator in car air conditioner
² / s ^{~30mm 2} / s may be used to those, in the reciprocating type of compressors even in the car air conditioner ^{7mm 2 / s ~15mm 2 / s} , preferably 8mm ² / s ~11mm
² / s, 1 for rotary type compressors
^{5mm 2 / s ~30mm 2 / s} , preferably 20mm ² / s ~27mm
Ester oils with a viscosity range of ² / s are 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. In addition, even within this range, the viscosity range used differs depending on the model used, and for refrigerators, there is a problem that the friction loss in the sliding part becomes large when it exceeds 9 mm ² / s. .. 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. If it is less than 15 mm ² / s, there is a problem of sealing characteristics, and if it exceeds 30 mm ² / s, there is a problem of compatibility with the refrigerant.

When the lubricating oil composition of the present invention is used in gear oil, it is preferable to adjust it to 20 to 480 mm ² / s.

[0074]

The lubricating oil composition of the present invention has a mixing ratio (weight ratio) of zinc thiophosphate and diphenyl carbonate of 1: 0.4 to 1: 0.6 with respect to mineral oil and / or synthetic oil. It is prepared by adding 0.1 to 5% by weight of the above additive. When the aluminum material is used as the wear site, the detailed reason for this is unknown, but the wear resistance is significantly improved. It has been found that it is excellent in equipment having an aluminum material in a worn portion, such as refrigerator oil, gear oil, engine oil, hydraulic oil, compressor oil, sliding surface oil, metalworking oil in refrigerators, car air conditioners, etc. It can be used as a lubricating oil composition.

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

[0076]

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 oils 1 to 1 were added by adding 0.10% by weight of di-t-butyl-4-N, N-dimethylaminomethylphenol and zinc thiophosphate and diphenyl carbonate in the proportions shown in the following table. 3 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 Test piece: 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 the above sample oils, the case where no additive was added was compared, and when the ratio of the additive was out of the range of the present invention, comparative oils 2 to 9 were similarly tested, and the results are shown at the same time. The unit of the added amount is% by weight.

[0079]

[Table 1]

As can be seen from the table, the antiwear agent of the present invention exhibits excellent antiwear properties against aluminum materials.

[0081]

Comparative Example 1 Sample oil 3 and comparative oil 1 of Example 1
10 mm as a test piece in SRV vibration friction wear test
Using φ steel ball (SUJ2) / cast iron plate (FC-25),
The results of the same tests as in Example 1 are shown in the table below.

[0082]

[Table 2]

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

[0084]

Example 2 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, 0.30% by weight of zinc thiophosphate and 0 of diphenyl carbonate were added. 0.1% by weight to prepare each sample oil,
The results of testing the lubricity of the aluminum plate as in Example 1 are also shown in the table below.

[0085]

[Table 3]

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

[0087]

Comparative Example 2 In the sample oils 4 to 7 in Example 2,
Comparative oils 9 to 1 without any additives other than antioxidants
2 was prepared and tested for lubricity on an aluminum plate as in Example 1, and the results are shown in the table below.

[0088]

[Table 4]

As can be seen from the table, the comparative oils 9-12 are
It can be seen that the wear resistance is lower than the sample oils 4 to 8.

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display area C10N 30:06 40:06 40:30

Claims (1)

[Claims] 1. A lubricating oil composition for equipment and devices, comprising an aluminum material in a worn portion, wherein mineral oil and / or synthetic oil is combined with zinc thiophosphate represented by the following general formula (1) and the following general formula (1): Diphenyl carbonate shown in 2) is added to 1: 0.4
A lubricating oil composition, characterized in that it is contained in a proportion of ˜1: 0.6 (weight ratio) and as a total amount thereof is 0.1 to 5% by weight based on the mineral oil and / or the synthetic oil. [Chemical 1] (In the formula, R _{1 to} R ₄ are an alkyl group having 4 to 16 carbon atoms, an aryl group, an alkenyl group, an aralkyl group and an araryl group, which may be the same or different.) (In the formula, R ₁ and R ₂ are hydrogen, an alkyl group having 1 to 20 carbon atoms, an aryl group, an alkenyl group, an aralkyl group, and an araryl group, which may be the same or different.)