WO2003031544A1

WO2003031544A1 - Lubricating oil composition

Info

Publication number: WO2003031544A1
Application number: PCT/JP2002/010279
Authority: WO
Inventors: Eitaro Morita
Original assignee: Nippon Oil Corporation
Priority date: 2001-10-02
Filing date: 2002-10-02
Publication date: 2003-04-17
Also published as: JP2003113391A; US20040192562A1; JP4199945B2

Abstract

A lubricating oil composition which comprises (A) a base oil for a lubricating oil, (B) calcium salicylate having a total base number of 50 to 300 mg KOH/g in an amount of 0.005 to 0.07 mass % in terms of calcium element, (C) a SP type extreme-pressure additive in an amount of 0.005 to 0.07 mass % in terms of phosphorus element, (D) a specific succinimide derivative in an amount of 0.1 to 6 mass % and (E) a boron-containing ashless dispersant in an amount of 0.001 to 0.05 mass % in terms of boron element, the percentages being relative to the total amount of the composition. The lubricating oil composition allows the prevention of pitching of a transmission, resulting in the increase of the fatigue life thereof, and exhibits satisfactory performance capability to prevent shuddering and also the capability to maintain the performance capability to prevent shuddering for a long period of time, and thus can be suitably used particularly for an automatic transmission and/or a non-stage transmission.

Description

Description Lubricating oil composition

[Technical field]

The present invention relates to a lubricating oil composition, and more particularly, to a lubricating oil composition having excellent anti-shudder performance, maintaining the anti-shudder performance for a long period of time, and having a long fatigue life, particularly an automatic transmission and And / or a lubricating oil composition suitable for a continuously variable transmission.

[Background technology]

Conventionally, automatic transmissions have been required to have thermal oxidation stability, abrasion resistance, friction characteristics of wet clutches and the like, and in order to improve such performance, an antioxidant, Lubricating oils containing various additives such as detergents / dispersants, antiwear agents, friction modifiers, seal swelling agents, viscosity index improvers, defoamers, and colorants are used.

In recent years, automatic transmissions have been demanded to be lighter and smaller, and the power transmission capacity has been pursued with the higher output of the combined engine. Therefore, the lubricating oils used in these products have the ability to prevent pitting (defects on the lubricated surface due to damage, etc.) on the surfaces of bearings, gears, etc. while maintaining high lubrication performance, and to prolong the fatigue life. Is required.

In recent years, in many automatic transmissions, a control (slip lock-up control) has been performed in which a slip-up clutch incorporated in a torque converter is slid at a low speed. As a result, the engine torque can be efficiently transmitted to the transmission mechanism while improving the ride comfort by absorbing the engine torque fluctuation. Some continuously variable transmissions have a so-called slip control in which a wet start clutch is first slid and then engaged to smoothly start from a stopped state. Excellent anti-shudder performance for slip control of these mouth-up clutches and starting clutches and performance that maintains this anti-shudder performance for a long period of time are required.

Out of these required performances, in order to extend the fatigue life, It has been conventionally known that it is effective to add a sulfur-based additive that provides prevention. However, sulfur-based additives have excellent extreme pressure properties, but have high activity on metal surfaces, so that wear due to corrosive wear cannot be avoided, and there is a problem when used alone. .

In addition, in order to maintain the anti-shudder performance and the anti-shudder performance for a long period of time, it is necessary to add an appropriate amount of a friction modifier that maintains the friction characteristics of the mouth-up clutch well. However, the friction modifier has a small effect of extending the fatigue life as described above, and when such a friction modifier is used in combination with the sulfur-based additive, the oxidation stability of the lubricating oil is deteriorated. As a result, the effect of maintaining the anti-shudder performance of the friction modifier decreases early. That is, in the prior art, it was extremely difficult to achieve both pitching prevention performance and shudder prevention and maintenance performance.

SUMMARY OF THE INVENTION In view of the circumstances described above, an object of the present invention is to provide a lubrication system that has a long fatigue life due to prevention of pitching of a transmission, a sufficient anti-shudder performance, and a performance to maintain the anti-shudder performance for a long period of time. An object of the present invention is to provide an oil composition, particularly a lubricating oil composition suitable for an automatic transmission and / or a continuously variable transmission.

[Disclosure of the Invention]

The present invention relates to (A) a lubricating base oil, (B) calcium salicylate having a total base number of 50 to 30 OmgKOHZg as a calcium element amount of 0.005 to 0.07 mass%, ) 0. the SP-based extreme pressure agent as the phosphorus element amount based on the total amount of the composition from 005 to 0.07 mass ^_0/0, (D) co Haq acid imide represented by the following general formula (3) and (4) One to two or more compounds selected from the group consisting of the compounds are 0.1 to 6 mass in terms of the total amount of the composition. /. (E) A lubricating oil composition comprising a boron-containing ashless dispersant in an amount of 0.001 to 0.05% by mass as a boron element based on the total amount of the composition.

(In the general formula (3), R ¹¹ represents a linear or branched hydrocarbon group having 8 to 30 carbon atoms, and R ¹² represents a hydrogen atom or a carbon atom having 1 to 30 carbon atoms. Represents a hydrocarbon group, R ¹³ represents a hydrocarbon group having 1 to 4 carbon atoms, and m represents an integer of 1 to 7.)

(In the general formula (4), R ¹⁴ and R ¹⁵ each independently represent a linear or branched hydrocarbon group having 8 to 30 carbon atoms, and R ¹⁶ and R ¹⁷ each represent an individual Represents a hydrocarbon group having 1 to 4 carbon atoms, and n represents an integer of 1 to 7.) Hereinafter, the present invention will be described in detail.

As the lubricating base oil (A) in the lubricating oil composition of the present invention, any mineral oil and Z or synthetic oil used as the base oil of ordinary lubricating oils can be used.

Examples of mineral oils include, for example, lubricating oil fractions obtained by distilling crude oil under normal pressure and reduced pressure, and then solvent dewaxing, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, and hydrogenation. Examples include paraffinic and naphthenic oils and normal paraffins that are purified by appropriately combining one or more purification treatments such as purification, sulfuric acid washing, and clay treatment.

Synthetic oils include, for example, poly-α-olefin (1

1-decene oligomer, ethylene-propylene oligomer, etc.) or its hydride, isopten oligomer or its hydride, isoparaffin, alkylbenzene, anolequinolenaphthalene, diestonole (ditridecyl glutarate, di-ethylethyl xyradiate) , Disodecyl adipate, ditridecyl adipate, di 2-ethylhexyl sebacate, etc.), polyol ester (trimethylolpropane caprylate, trimethylolpropaneperargonate, pentaerythritol)

2-ethylhexanoate, pentaerythritol perargonate, etc.), polyoxyalkylene glycol, dialkyl diphenyl ether, and polyphenyl Ether and the like can be mentioned.

In the present invention, in order to further improve the fatigue life, (A-1) a mineral oil, a synthetic oil, or a mixture thereof having a kinematic viscosity at 100 ° C. of 2 to 6 mm ² Zs; 2) 1 00 ° C kinematic viscosity of 1 0~ 50 mm ² / s, preferably used in combination of two or base oils having different kinematic viscosities of heavy mineral oil of 1 5~45mm ² / s Is preferred. And伹, in the present invention, 1 00 ° kinematic viscosity of the C of the base oil to a base oil obtained by mixing is preferably. 1 to 1 Omm ² Bruno 3, more preferably. 2 to 8 mm ² / s.

The mixing ratio of the kinematic viscosity base oil of (A-1) and the kinematic viscosity base oil of (A_2) is 60 to 99.5 by mass ratio of (A-1): (A-2): It is preferably from 40 to 0.5, more preferably from 65 to 95:35 to 5. If the addition amount of the base oil having the kinematic viscosity of (A-2) is less than 0.5% by mass, the effect of further improving the fatigue life by mixing the heavy base oil cannot be obtained, and the addition amount is 40% by mass. Exceeding the above range may deteriorate the low-temperature fluidity of the lubricating oil and adversely affect the low-temperature startability of the transmission. Examples of the calcium salicylate which is the component (B) of the present invention include neutral calcium salicylate, basic calcium salicylate, carbonate overbased (super-base) calcium salicylate, borate overbased ( (Ultrabasic) calcium salicylate and mixtures thereof.

The method for producing calcium salicylate is not particularly limited. For example, the neutral (normal salt) calcium salicylate is an alkylsalicylic acid having one or two alkyl groups having 10 to 30, preferably 12 to 20, and more preferably 14 to 18 carbon atoms. It can be produced by, for example, a method of reacting with a calcium base (calcium oxide or hydroxide) in the presence or absence of sulfur element. Examples of the alkyl group of the alkylsalicylic acid include a decyl group, a pendecyl group, a dodecyl group, a tridecyl group, a tetradecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, an octadecyl group, a nonadecyl group, an icosyl group, a henycosyl group, Examples include a docosyl group, a tricosinole group, a tetracosinole group, a pentacosyl group, a hexacosyl group, a heptacosyl group, an octacosyl group, a nonacosyl group, and a triacontyl group. Above all, tetrade Syl, pentadecyl, hexadecyl, heptadecyl and octadecyl are preferred. The basic calcium salicylate can be produced by, for example, heating the neutral (normal salt) calcium salicylate and excess calcium salt or base in the presence of water. The carbonate overbased (ultrabasic) calcium salicylate can be produced by, for example, a method of reacting the neutral (normal salt) calcium salicylate with a calcium base in the presence of carbon dioxide gas. The method of reacting the neutral (normal salt) calcium salicylate with a calcium base and a boric acid compound such as boric acid or anhydrous boric acid comprises: Can be produced by a method of reacting the above-mentioned carbonate overbased (ultrabasic) calcium salicylate with a boric acid compound such as boric acid or anhydrous boric acid.

The basicity of the component (B) is desirably a basic calcium salicylate having a total base number of 50 to 30 Omg KOHZg, preferably 70 to 25 Omg KO HZg. The term “total base number” as used herein means the total base number by the perchloric acid method, which is measured in accordance with JISK2501, “Petroleum products and lubricating oils-Neutralization value test method”. When the total salt base value is less than 5 Omg KOHZg, the effect of suppressing the reduction in strength against repeated compression of the wet clutch is insufficient, while when the total base number exceeds 30 Omg KOHZg, the storage stability of the composition Are not preferred, respectively. In the present invention, the lower limit of the content of the component (B) is 0.005% by mass, preferably 0.01% by mass, based on the total amount of the composition, while the upper limit is 0.07% by mass. , preferably, 0.06 mass ^_0/0. When the content of the component (B) is less than 0.005% by mass, the friction adjusting function is insufficient, shudder prevention and maintenance life are shortened. On the other hand, if the content exceeds 0.07% by mass, the calcium salt produced when the component (B) calcium salicylate is decomposed is wet friction cracking.

> Clogging of pores may change the coefficient of friction. The component (C) in the lubricating oil composition of the present invention is an SP type extreme pressure agent, and specifically, a phosphorus compound represented by the following general formula (1) and a phosphorus compound represented by the following general formula (2) Compounds and their salts can be mentioned. 1 1 2 2

R-X-P-X-R h)

3 3

XR In the general formula (1), at ^{least one} of X ¹ , X ² and X ³ represents a sulfur atom and the others represent an oxygen atom. RR ² and R ³ each independently represent a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms.

S

4 4

R-X-P-X-R

° 6

XR In the general formula (2), X ⁴ , X ⁵ and X ⁶ each independently represent an oxygen atom or a sulfur atom. R ⁴ , R ⁵ and R ⁶ each independently represent a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms. .

Specific examples of the hydrocarbon group having 1 to 30 carbon atoms represented by R ¹ to R ⁶ include an alkyl group, a cycloalkyl group, an alkyl group, an alkyl-substituted cycloalkyl group, an aryl group, Examples thereof include an alkyl-substituted aryl group and an arylalkyl group.

Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, a pendecyl group, a dodecyl group, a tridecyl group, and a tetradecyl group. And alkyl groups such as a pentadecyl group, a hexadecyl group, a heptadecyl group, and an octadecyl group (the alkyl groups may be linear or branched).

Examples of the cycloalkyl group include cycloalkyl groups having 5 to 7 carbon atoms, such as a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group. Examples of the alkylcycloalkyl group include a methylcyclopentyl group, a dimethylenocyclopentyl group, a methylethylcyclopentyl group, a getylcyclopentyl group, a methylcyclohexyl group, a dimethyl / recyclohexyl group, and a methylethylopenhexyl group. , A methylhexyl hexyl group, a methylcyclohexyl group, Examples of the alkyl group having 6 to 11 carbon atoms such as dimethinolecycloheptinol group, methinoleethynolecycloheptinol group, and ethynolecycloheptyl group (the substitution position of the anorecyl group with the cycloalkyl group is also arbitrary) be able to.

Examples of the alkenyl group include a butenyl group, a pentenyl group, a hexenyl group, a hepturyl group, an otaturyl group, a nonenyl group, a decenyl group, a pendenyl group, a dodecel group, a tridecenyl group, a tetradecenyl group, a pentadecenyl group, and a hexadecenyl group. And alkenyl groups such as a heptadecenyl group and an octadecenyl group (the alkenyl groups may be linear or branched, and the position of the double bond is also arbitrary).

Examples of the aryl group include aryl groups such as a phenyl group and a naphthyl group. Examples of the alkylaryl group include, for example, a trinole group, a xylyl group, an ethynolephenine group, a propinolephene-nole group, a ptinolephenine group, a pentinolephele group, a hexylphenyl group, a heptylphenyl group, and an octylphenyl group. C 7-18 alkylaryl groups such as phenolic groups, phenolic groups, decylfuel groups, decylphenyl groups, dodecylphenyl groups, etc. (The alkyl group may be linear or branched, and substitution with aryl groups The position is also arbitrary).

Examples of the above arylalkyl group include an arylalkyl group having 7 to 12 carbon atoms, such as a benzyl group, a phenylethyl group, a phenylpropynole group, a phenylbutynole group, a phenylphenolyl group, and a phenylhexynole group. The group may be linear or branched).

The hydrocarbon group having 1 to 30 carbon atoms represented by R ¹ ! ^ ⁶ is preferably an alkyl group having 1 to 30 carbon atoms or an aryl group having 6 to 24 carbon atoms, and more preferably. Preferred are alkyl groups having 4 to 20 carbon atoms, and more preferred are alkynole groups having 6 to 18 carbon atoms.

Examples of the SP extreme pressure agent represented by the general formula (1) include the following phosphorus compounds.

Thiophosphorous acid; '

Monopropynolethiophosphite, Monobutylthiophosphite, Monopentyl Monoalkyl thiophosphites such as thiophosphite, monohexyl thiophosphite, monobutyl thiophosphite, monooctyl thiophosphite, monolauryl thiophosphite, etc. But may be branched); mono ((alkyl) aryl) esters of thiophosphoric acid such as monophenylthiophosphite and monocresylthiophosphite;

Dipropyl thiophosphite, dibutyl thiophosphite, dipentyl thiophosphite, dihexyl thiophosphite, dibutyl thiophosphite, octyl thiophosphite, dilauryl thiophosphite, etc. Dialkyl thiophosphites (the alkyl group may be linear or branched);

Di ((alkyl) arinole) esters of thiophosphorus such as diphenylthiophosphite and dicresylthiophosphite;

Such as tripropyl thiophosphite, triptyl thiophosphite, tripentyl thiophosphite, trihexyl thiophosphite, triptyl thiophosphite, triotatyl thiophosphite, trilauryl thiophosphite, etc. Trialkyl phosphite (alkyl groups may be linear or branched); tri (phosphoryl) aryl esters such as triphenylthiophosphite, tricresylthiophosphite, etc. ;

Dithiophosphorous acid;

Monopropyldithiophosphite, monobutyldithiophosphite, monopentyldithiophosphite, monohexinoresitiophosphite, monobeptinoresitiophosphite, monooctyldithiophosphite, mono Monoalkyl dithiophosphites such as lauryl dithiophosphite (the alkyl group may be linear or branched); dithiophosphites such as monophenylinolethiophosphite and monocresyldithiophosphite Phosphorous acid mono ((alkyl) aryl) ester;

Dipropyldithiophosphite, dibutyldithiophosphite, dipentyldithiophosphite, dihexyldithiophosphite, dialkyldithiophosphophosphite dialkyl phosphite May be branched); dithiophosphorus, such as difurdithiophosphite and dicresyldithiophosphite Acid di ((alkynole) aryl) ester;

Tripropyldithiophosphite, tributyldithiophosphite, tripentyldithiophosphite, trihexyldithiophosphite, triptyldithiophosphite, trioctyldithiophosphite, trilauryldithio Trialkyl phosphite trialkyl esters such as phosphites (the alkyl group may be linear or branched); trithiophosphites such as triphenyldithiophosphite and tricresyldithiophosphite. ((Alkyl) aryl) ester;

Trithiophosphorous acid;

Monopropyl trithiophosphite, monobutyl trithiophosphite, mono pentyl trithiophosphite, monohexynoletrithiophosphite, monoethyl trithiophosphite, monooctyl trithiophosphite Monoalkyl esters of trithiophosphoric acid such as monolauryl trithiophosphite (the alkyl group may be linear or branched); monoethyl trithiophosphite, monocresyl trithiophosphite, etc. Trithiophosphorous acid mono ((alkyl) aryl)

Dipropyl trithio phosphite, dibutinole tri thio phosphite, dipentyl tri thio phosphite, dihexyl tri thio phosphite, di butyl tri thio phosphite, dioctyl tri thio phosphite, di lauryl tri Dialkyl trithiophosphites such as thiophosphite (the alkyl group may be linear or branched); dithiophosphites such as diphenylinoletrithiophosphite and dicresyltrithiophosphite. (Alkyl) aryl) ester;

Tripropyl trithiophosphite, triptyl trithiophosphite, tripentyl trithiophosphite, trihexyl trithiophosphite, triptyl trithiophosphite, trioctyl trithiophosphite, trilauryl tri Trithiophosphite trialkyl esters such as thiophosphite (the alkyl group may be straight-chained or branched); trithiophosphites such as triphenyl thiophosphite and tritaredyl trithiophosphite; ((Alkyl) aryl) Estenolle;

And mixtures thereof. In the present invention, two or more of X i X ^{3 in} the above general formula (1) are preferably sulfur atoms, and more preferably all three are sulfur atoms.

Examples of the SP type extreme pressure agent represented by the general formula (2) include the following phosphorus compounds.

Thiophosphoric acid;

Monothiophosphoric acid monophosphates such as monopropinorethiophosphate, monopetit / rethiophosphate, monopentinorethiophosphate, monohexinorethiophosphate, monopeptinolethiophosphate, monooctylthiophosphate, monolaurinorethiophosphate, etc. Alkyl esters (the alkyl group may be linear or branched); mono ((alkyl) aryl) esters of thiophosphoric acid such as monophenylthiophosphate and monocresylthiophosphate;

Dipropynolethiophosphate, dibutylthiophosphate, dipentylthiophosphate, dihexynolethiophosphate, diptinolethiophosphate, dioctylthiophosphate, dilaurylthiophosphate, etc. (Alkyl group may be linear or branched); di ((alkyl) aryl) thiophosphate such as diphenylthiophosphate and dicresylthiophosphate;

Thiophosphoric acid such as tripropyl thiophosphate, triptyl thiophosphate, tripentyl thiophosphate, trihexyl thiophosphate, tribeptinolethiophosphate, trioctyl thiophosphate, trilauryl thiophosphate, etc. Trialkyl esters (the alkyl group may be linear or branched); trithiophosphoric acid such as triphenylthiophosphate, tricresylthiophosphate, etc.

((Alkyl) aryl) ester;

Dithiophosphoric acid;

Monopropinoresitiophosphate, monobutinoresitiophosphate, monopentinoresitiophosphate, monohexinoresitiophosphate, monopeptinoresitiophosphate, monooctyldithiophosphate, mono Dithiophosphoric acid monoalkyl esters such as laurinoresitiophosphate (the alkyl group may be linear or branched); monopheninoresitiophosphate, monocresie / resitiophosphoate Dithiophosphoric acid mono ((alkyl) aryl) esters such as

Dithiophosphoric acids such as dipropy / regiophosphate, dibuti / regiophosphate, dipentinoresithiophosphate, dihexyldithiophosphate, dibutyldithiophosphate, dioctyldithiophosphate, dilauryldithiophosphate, etc. Dialkyl esters (alkyl groups may be linear or branched); dithiophosphoric acid dithiophosphoric acid, dicresyldithiophosphoric acid, etc.

((Alkyl) aryl) esters;

Tripropinoresitiophosphate, tributyldithiophosphate, tripentinophosphate resin, trihexyldithiophosphate, triptyldithiophosphate, trioctyldithiophosphate, trilauryldithiophosphate, etc. (Alkyl groups may be linear or branched); dithiophosphoric tri ((alkyl) aryl) esters such as triphenyldithiophosphate and tricresyldithiophosphate;

Trithiophosphoric acid;

Monopropinoletrithiophosphate, monobutyltrithiophosphate, monopentinoretrithiophosphate, monohexinoletrithiophosphate, monopentinoretrithiophosphate, monooctyltrithiophosphate, monolauryl trithiophosphate Monoalkyl esters of trithiophosphoric acid (the alkyl group may be linear or branched); mono ((alkyl) aryl) dithiophosphates such as monophenyltrithiophosphate and monocretyltrithiophosphate;

Dithiophosphoric acid such as dipropylate / retrithiophosphate, dibutyltrithiophosphate, dipentyltrithiophosphate, dihexynoletrithiophosphate, dibutyltrithiophosphate, dioctyltrithiophosphate, dilauryltrithiophosphate, etc. Dialkyl esters (the alkyl group may be linear or branched); dithio (trialkyl) aryl esters such as diphenyltrithiophosphate and dicresyltrithiophosphate;

Tripropyl trithiophosphate, Tributyl trithiophosphate, Tripentyl trithiophosphate, Trihexyl trithiophosphate, Tripe Trialkyl trithiophosphates such as tiltrithiophosphate, trioctyltrithiophosphate, and trilauryl trithiophosphate (the alkyl group may be linear or branched); trithiophosphoric acids such as trifuel trithiophosphate and tricresyl trithiophosphate Tri ((alkyl) aryl) acid;

Tetrathiophosphoric acid;

Monopropyltetrathiophosphate, monobutyltetrathiophosphate, monopentinoletetrathiophosphate, monohexyltetrathiophosphate, monopeptinoletetrathiophosphate, mono Monoalkyl esters of tetrathiophosphates such as octyltetrathiophosphate and monolauryltetrathiophosphate (the alkyl group may be linear or branched); monophenyltetrathiophosphate, monocrete Dithiophosphoric acid mono ((alk / re) aryl) ester such as diltratiothiophosphate;

Dipropynoletetrathiophosphate, dibutyltetrathiophosphate, dipentyltetrathiophosphate, dihexyltetrathiophosphate, dibutyltetrathiophosphate, dioctyltetrathiophosphate, dilauryltetrathiophosphate, etc. Dialkyl dithiophosphates (the alkyl group may be linear or branched); di ((alkyl) aryl) tetrathiophosphates such as diphenyltetrathiophosphate and dicresyltetrathiophosphate; tripropyltetrathiophosphate , Triptyl tetrathiophosphoate, tripentinole tetrathiophosphoate, trihexyl tetrathiophosphoate, triptyl tetrathiophosphoate, trioctyl tetrathiophosphoate, trila Trialkylesters such as peryltetrathiophosphate (the alkyl group may be linear or branched); tetraalkyls such as triphenyltetrathiophosphate and tricresyltetrathiophosphate Trithiophosphoric acid

And mixtures thereof.

In the present invention, it is preferable that 1 to 3 of X ^{4 to} X ^{6 in} the general formula (2) are sulfur mosquitoes, and it is more preferable that 1 or 2 is a sulfur atom. . In addition, as the salt of the phosphorus compound represented by the general formula (1) or (2), only ammonia or a hydrocarbon group having 1 to 8 carbon atoms or a hydrocarbon group containing a hydroxy group in a phosphorus compound is contained in the molecule. A salt obtained by reacting a nitrogen compound such as an amine compound having the above with the compound to neutralize a part or all of the remaining oxyhydrogen can be mentioned.

Specific examples of the nitrogen compound include ammonia; monomethylamine, monoethynoleamine, monopropylamine, monobutynoleamine, monopentynoleamine, monohexylamine, monohepti / reamine, and monooctylamine. , Dimethylamine, methynoleethynoleamine, ethynoleamine, methynolepropynoleamine, ethylpropynoleamine, dipropylamine, methylbutylamine, ethylethylamine, propinoleptine / reamine, dibutynoleamine, dipentynoleamine, dihexene / Reamin, Hye Petit Honoré amine, Arukiruamin such Jiokuchiruamin (alkyl group may be branched even linear); mono methanol § min, monoethanolamine § min, Monopu b Nono ⁰ Nonoreamin, mono descriptor nono Rare Mi , Monopentanoyl / reamine, monohexanolamine, monoheptanolamine, monooctanolamine, monononanolenoamine, dimethanolenoamine, methanolenoethanolamine, diethanolamine, methanolpropanolamine, ethanolpropanolamine, diamine Propanolamine, methanol butanolamine, ethanolbutanolamine, phenol-butanolamine, dibutanol / reamine, dipentanolamine, dihexanolamine, diheptanolamine, dioctanolamine, etc. Alkanolamines (the alkanol group may be linear or branched); and mixtures thereof.

One or more of these components (C) can be arbitrarily compounded.

When the component (C) is used as a lubricating oil composition for a transmission, it is possible to impart not only abrasion resistance but also optimized friction characteristics in a wet clutch at the same time.

In the lubricating oil composition of the present invention, the content of the component (C) is at least 0.05% by mass, preferably 0.08% by mass, as a phosphorus element concentration based on the total amount of the composition. On the other hand, the content thereof is 0. and 0 7 wt% or less, preferably 0. 0 6 mass ^_0/0 It is as follows. The content of component (C), if less than 0.00 ⁵ mass% elemental phosphorus, no effect on the abrasion resistance, if it exceeds 0.07% by mass,

Respectively, which is not preferred. The component (D) in the lubricating oil composition of the present invention is a succinimide compound represented by the following general formula (3) or (4).

—In the general formula (3), R ¹¹ represents a linear or branched hydrocarbon group having 8 to 30 carbon atoms. R ¹² represents a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms. R ¹³ represents a hydrocarbon group having 1 to 4 carbon atoms. m is an integer of 1 to 7.

In the general formula (4), R ¹⁴ and R ¹⁵ each independently represent a linear or branched hydrocarbon group having 8 to 30 carbon atoms. R ¹⁶ and R ¹⁷ each independently represent a hydrocarbon group having 1 to 4 carbon atoms. n is an integer of 1 to 7.

In R ¹⁴及Pi R ¹⁵ of R ¹¹ and the formula of the general formula (3) (4), these are individually 8 carbon atoms 30, preferably linear or branched C 1 2 to 25 carbon atoms Represents a branched hydrocarbon group. Examples of such a hydrocarbon group include an alkyl group and an alkenyl group, and an alkyl group is preferable. Examples of the alkyl group include an octyl group, an otatur group, a noel group, a nonyl group, a decyl group, a decenyl group, a dodecyl group, a dodecenyl group, an octadecyl group, an otatadecenyl group, and a linear group having up to 30 carbon atoms. Or a branched alkyl group. When the number of carbon atoms of the hydrocarbon group is less than 8 or more than 30, it is difficult to obtain a sufficient shudder mono-vibration prevention effect. In the present invention, the carbon number of 8-30 A branched alkyl group is more preferred, and a branched alkyl group having 10 to 25 carbon atoms is particularly preferred. When a branched alkyl group having 8 to 30 carbon atoms is used, a lubricating oil composition exhibiting a higher torque capacity can be obtained as compared with a case where a linear alkyl group is used.

R ^{13 in} the general formula (3) and R ¹⁶ and R ^{17 in} the general formula (4) each independently represent a hydrocarbon group having 1 to 4 carbon atoms. Specific examples of the hydrocarbon group having 1 to 4 include an alkylene group having 1 to 4 and preferably an alkylene group having 2 or 3 carbon atoms (an ethylene group or a propylene group).

R ^{12 in the} general formula (3) represents a hydrogen atom or a linear or branched hydrocarbon group having 1 to 30 carbon atoms. Examples of the linear or branched hydrocarbon group with carbon number 1 to 30 represented by R ^12, for example, include a linear or branched alkyl group or Arukeeru group of from 1 to 30 carbon Can be. Preferably, it is a branched alkyl or alkenyl group having 1 to 30 carbon atoms, more preferably 8 to 30 carbon atoms, and more preferably 10 to 25 carbon atoms. Particularly preferred is a branched alkyl group.

In the general formula (3) or (4), n and m each represent an integer of 1 to 7, and in order to obtain a lubricating oil composition having a higher torque capacity, n and m are preferably Each is 1, 2 or 3, and particularly preferably 1.

The succinic acid imid compound represented by the general formula (3) or (4) can be produced by a known method. For example, it can be obtained by reacting an alkyl or alkenyl succinic anhydride with a polyamine. Specifically, in the monosuccinic acid imide represented by the general formula (3) in which R ¹² is a hydrogen atom, for example, one mole of a polyamine such as diethylenetriamine, triethylenetetramine, and tetraethylenepentamine is used. On the other hand, 1 mol of succinic anhydride having a linear or branched alkyl group or a carboxylic acid group of 8 to 30 carbon atoms under a nitrogen atmosphere at 130 to 180 ° C. Preferably, it can be obtained by gradually dropping at a temperature of preferably 140 to 175 ° C., reacting for 1 to 10 hours, preferably 2 to 6 hours, and distilling off unreacted polyamine. Further, in the monosuccinimide represented by the general formula (3) wherein R ¹² is a hydrocarbon group having 1 to 30 carbon atoms, for example, N-octadecyl-1,3-propanediamine and the above succinic anhydride may be used. React in the same way as Can be obtained by Furthermore, in the bissuccinic acid imid represented by the general formula (4), 0.5 mol of the above polyamine is added dropwise to 1 mol of the above succinic anhydride under the same conditions as above. By removing the generated water.

In the present invention, a lubricating oil composition having a higher torque transmission capacity can be obtained as the component (D) as compared with the monotype succinic acid imide represented by the general formula (3). 4) It is particularly preferable to use a bis-type succinic acid imid represented by the formula:

In the lubricating oil composition of the present invention, the content of the component (D) is at least 0.1% by mass, and preferably at least 0.2% by mass, based on the total amount of the lubricating oil composition. On the other hand, the content of the component (D) is at most 6% by mass, preferably at most 4% by mass, based on the total amount of the lubricating oil composition. (D) The content of the component is 0.1 mass. /. When the content is less than 10%, the effect of maintaining shudder prevention performance and maintaining good shifting characteristics is inferior. On the other hand, when the content of component (D) exceeds 6% by mass, the effect corresponding to the addition amount cannot be obtained. . The component (E) in the lubricating oil composition of the present invention is a boron-containing ashless dispersant. It is important that the component (E) of the present invention contains boron. When an ashless dispersant containing no boron is used as the component (E), fatigue such as pitting and flaking is prevented even when used in combination with the components (B), (C) and (D). However, the performance of preventing shudder cannot be sufficiently exhibited, and the object of the present invention cannot be achieved because the lubricating oil composition is inferior in wear resistance and oxidation stability.

Specific examples of the component (E) include a boron compound such as a nitrogen compound having at least one alkyl group or alkyl group having 40 to 400 carbon atoms in the molecule or a derivative thereof, such as a nitrogen compound. One or two or more arbitrarily selected from these can be blended.

The alkyl group or the alkenyl group may be linear or branched, but is preferably, specifically, an oligomer of an olefin such as propylene, 1-butene, isobutylene, or the like, or a mixture of ethylene and propylene. Examples include a branched alkyl group and a branched alkenyl group derived from a co-oligomer. The alkyl or alkenyl group may have any number of carbon atoms, but preferably has 40 to 400, more preferably 60 to 350. If the alkyl or alkenyl group has less than 40 carbon atoms, the solubility of the compound in the lubricating base oil may decrease.On the other hand, if the alkyl or alkenyl group has more than 400 carbon atoms, the lubricating oil Since the low-temperature fluidity of the composition may deteriorate, each is not preferable. Specific examples of the nitrogen compound or its derivative include, for example, one or more compounds selected from the following.

(E-1) Imido succinate having at least one anoalkyl group or alkenyl group having 40 to 400 carbon atoms in the molecule, or a derivative thereof

(E-2) Benzylamine having at least one anoalkyl group or alkenyl group having 40 to 400 carbon atoms in the molecule, or a derivative thereof

(E-3) a polyamine having at least one alkyl or alkenyl group having 40 to 400 carbon atoms in the molecule, or a derivative thereof

(E-1) More specifically, examples of the succinic acid imide include compounds represented by the following general formulas (5) and (6).

In the general formula (5), R ²¹ represents an alkyl group or an alkenyl group having 40 to 400 carbon atoms, preferably 60 to 350 carbon atoms, and a represents an integer of 1 to 5, preferably 2 to 4.

In the general formula (6), R ²² and R ²³ each independently represent an alkyl group or an alkenyl group having 40 to 4 ° C., preferably 60 to 350, and b represents 0 to 4 It preferably represents an integer of 1 to 3.

The mono-type succinic acid imide represented by the general formula (5) or the bis-type succinic acid imide represented by the general formula (6) can be used alone or in combination. .

(E-2) The benzylamine includes, more specifically, a compound represented by the general formula (7).

In the general formula (7), R ²⁴ represents an alkyl group or alkenyl group having 40 to 400 carbon atoms, preferably 60 to 350 carbon atoms, and c represents an integer of 1 to 5, preferably 2 to 4.

The method for producing the benzylamine represented by the general formula (7) is not limited at all. For example, a reaction of a polyolefin such as a propylene oligomer, a polybutene, or an ethylene-α-olefin copolymer with a phenol is performed. It is obtained by reacting formaldehyde with a polyamine such as diethylenetriamine, triethylenetetramamine, tetraethylenepentamine, pentaethylenehexamine or the like by Mannich reaction.

(II-3) More specifically, the polyamine includes, for example, a compound represented by the general formula (8).

R2 ₅ _N _H — (CH ₂ CH ₂ NH) _D — H (8)

—In the general formula (8), R ²⁵ represents an alkyl group or an alkyl group having 40 to 400, preferably 60 to 350 carbon atoms, and d represents 1 to 5, preferably 2 to 4 Indicates the integer of.

The production method of the polyamine represented by the general formula (8) is not limited at all. For example, after chlorinating a polyolefin such as propylene oligomer, polybutene, and ethylene- _α -olefin copolymer, This is obtained by reacting with ammonia, polyamines such as ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine and pentaethylenehexamine. be able to.

Specific examples of the derivatives of the nitrogen compounds represented by the above (E-1) to (E-3) include, for example, monocarboxylic acids having 2 to 30 carbon atoms (such as fatty acids) ) A polycarboxylic acid having 2 to 30 carbon atoms such as oxalic acid, phthalic acid, trimellitic acid, and pyromellitic acid is allowed to act to neutralize a part or all of the remaining amino and / or imino groups. And amidated, so-called carboxylic acid-modified compounds, sulfur-modified compounds obtained by reacting a sulfur compound with a nitrogen compound as described above, and mixtures thereof.

The component (E) of the present invention is obtained by modifying the above-mentioned nitrogen compound or a derivative thereof with a boron compound.

The method for modifying a nitrogen compound or a derivative thereof with a boron compound is not limited at all, and any method is possible.For example, the above-mentioned nitrogen compound or a derivative thereof may be added to boric acid, borate or Examples thereof include a method in which a boron compound such as a borate ester is allowed to act to neutralize or amidate a part or all of the amino group and the Z or imino group remaining in the nitrogen compound or a derivative thereof.

Specific examples of the boron compound include orthoboric acid, metaboric acid, and tetraboric acid. Specific examples of the borate include alkali metal salts, alkaline earth metal salts, and ammonium salts of boric acid. More specifically, lithium metaborate and lithium tetraborate Lithium borates such as sodium pentaborate, lithium perborate; sodium borate such as sodium metaborate, sodium diborate, sodium tetraborate, sodium pentaborate, sodium hexaborate, sodium octaborate Potassium borate such as potassium metaborate, potassium tetraborate, potassium pentaborate, potassium hexaborate, potassium octaborate; calcium metaborate, calcium diborate, tricalcium tetraborate, tetraborate (5) Calcium borate such as cane resium and calcium hexaborate; magnesium metaborate and magnesia diborate Magnesium borate such as sodium, trimagnesium tetraborate, pentamagnesium tetraborate and magnesium hexaborate; and ammonium metaborate, ammonium tetraborate, ammonium pentaborate, and ammonium octaborate And ammonium borate and the like. In addition, borate esters include Esters of an acid and preferably an alkyl alcohol having 1 to 6 carbon atoms are mentioned. More specifically, monomethyl borate, dimethyl borate, trimethyl borate, monoethyl borate, getyl borate, triethyl borate, Monopropyl borate, dipropyl borate, tripropyl borate, monobutyl borate, dibutyl borate, tributyl borate and the like.

The boron content in the component (E) is optional, but is 0.2 mass in order to obtain a long fatigue life and good wear resistance. / ₀ or more, more preferably _0.4 % by mass or more, while the content is preferably 4% by mass or less, more preferably 2.5% by mass. is there.

As the component (E) of the present invention, the above-mentioned (E-1) an alkyl group or an alkenyl group having 40 to 400 carbon atoms in the molecule is particularly preferred because of its excellent effect of improving fatigue life and improving wear resistance. A succinic acid imid having at least one or a derivative thereof is used as a nitrogen-containing compound, which is modified with a boron compound, or a mixture thereof.

In the lubricating oil composition of the present invention, the content of the component (E) is 0.001% by mass or more, preferably 0.002% by mass, as a boron element amount based on the total amount of the lubricating oil composition. / ₀ or more. On the other hand, the content is 0.05% by mass or less, preferably 0.03% by mass or less, as the boron element amount based on the total amount of the lubricating oil composition. (E) The content of the component is 0.001 mass. /. If the content is less than 30, the effect of preventing the pitching and flaking by the component (E) is poor, while the content of the component (E) is 0.0.

If the content exceeds 5% by mass, the oxidation stability of the lubricating oil composition is deteriorated, and therefore, each is not preferred. Known lubricating oil additives can be added to the lubricating oil composition of the present invention for the purpose of further enhancing the performance as a lubricating oil. Examples of additives that can be added include, for example,

(F) Phosphorus extreme pressure agent, (G) Boron-free ashless dispersant, (H) Metallic detergent other than component (B), (I) Friction modifier, (J) Antioxidant, ( K) viscosity index improver,

(L) antifoaming agents, (M) antistatic agents, (N) corrosion inhibitors, (O) pour point depressants, and (P) rubber swelling agents. These can be used alone or in combination Can be.

It is desirable to add (F) a phosphorus-based extreme pressure agent to the lubricating oil composition of the present invention from the viewpoint of maintaining the wear resistance of the gear and the friction characteristics of the wet clutch.

Examples of the phosphorus-based extreme pressure agent include zinc alkyldithiophosphate, phosphoric acid, phosphorous acid, phosphoric acid monoesters, phosphoric diesters, phosphoric acid triesters, phosphorous acid monoesters, and phosphorous acid monoesters. Phosphoric diesters, phosphite triesters, salts of (sub) phosphoric esters, and mixtures thereof.

Among the above phosphorus extreme pressure agents, those excluding phosphoric acid and phosphorous acid are compounds containing a hydrocarbon group having usually 2 to 30 carbon atoms, preferably 3 to 20 carbon atoms.

Specific examples of the hydrocarbon group having 2 to 30 carbon atoms include an ethyl group, a propyl group, a butyl group, a pentyl group, a hexynole group, a heptyl group, an octynole group, a nor group, a decyl group, and a decyl group. Groups, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group and other alkyl groups (these alkyl groups may be linear or branched); butelyl groups, pentenyl Group, hexenyl group, heptyl group, octenyl group, nonenyl group, decyl group, pentadecyl group, dodecyl group, tridecenyl group, tetradecenyl group, pentadecenyl group, hexadecenyl group, heptadecenyl group, octadecenyl group Alkenyl groups such as alkenyl groups (the alkenyl groups may be linear or branched, and the position of the double bond is arbitrary. Any); a cyclopentyl group, a cyclohexyl group, the carbon number of such Puchinore group cyclohexylene 5

7 cycloalkyl groups; methylcyclopentyl group, dimethinolecyclopentyl group, pentinole group in methinoleethynolec mouth, pentinole group in getylsick mouth, meth / lecyclohexyl group, dimethylcyclohexyl group, methinolethynolecyclohexynole Alkyl groups having 6 to 11 carbon atoms (e.g., alkyl groups) such as a group, a ethynolecyclohexyl group, a methylcycloheptyl group, a dimethylcycloheptyl group, a methylenoethynolecycloheptyl group, and a ethynolecycloheptinol group. Aryl groups such as phenyl, naphthyl, etc .: tolyl, xylyl, ethylphenyl, propylphenyl, butylphenyl, pentylphenyl, pentylphenyl, etc. Hexinolefeninole group, Heptinolefeninole , O Chi Roh reflex Well Honoré group, Noninorefue - group, Deshirufuweniru group, © down de Sylph We group, carbon atoms such as Dodeshirufuweniru group An alkylaryl group of the formulas 7 to 18 (the alkyl group may be linear or branched, and the substitution position on the aryl group is arbitrary); benzyl group, phenylethyl group, phenylpropyl group, Aralkyl groups having 7 to 12 carbon atoms, such as a phenylbutyl group, a phenylpentyl group, and a phenylhexyl group (the alkyl groups may be linear or branched); and the like.

(F) Examples of preferred compounds as the phosphorus-based extreme pressure agent include phosphoric acid; phosphorous acid; zinc dipropyldithiophosphate, zinc dibutyldithiophosphate, zinc dipentyldithiophosphate, zinc dihexyldithiophosphate, Zinc alkyldithiophosphates such as zinc heptyldithiophosphate and zinc octyldithiophosphate (the alkyl group may be linear or branched); monopropyl phosphate, monobutyl phosphate, mono-pentinole Monoalkyl phosphates such as phosphate, monohexynolephosphate, monopeptinolephosphate and monooctyl phosphate (the alkyl group may be linear or branched); phosphorus such as monophenyl phosphate and monocresyl phosphate Acid mono (alkyl) aryl esters; dipropylphosphine Dialkyl phosphates such as dibutyl phosphate, dipentyl phosphate, dipentyl / rephosphate, dihexyl phosphate, dibutyl phosphate, dioctyl phosphate (the alkyl group may be linear or branched); diphen -Di (anoreky) aryl esters such as diphosphate and dicycloresinolephosphate; tripropyl phosphate, triptinolephosphate, tripentinophosphate, trihexinolephosphate, tripeptinolephosphate, trioctinolephosphate. Trialkyl phosphates such as phosphates (the alkyl group may be linear or branched); Tri (alkyl) aryl phosphates such as triphenyl phosphate and tricresyl phosphate; monopropynole phosphates , Thing Monoalkyl phosphites such as tinolephosphite, monopentinophosphite, monohexynolephosphite, monobutylphosphite, and monooctylphosphite (the alkyl group may be linear or branched) ); Mono (alkyl) aryl esters of phosphite such as monophenyl phosphite and monomethyl resyl phosphite; dipropyl phosphite, dibutinole phosphite, dipentinole phosphite, dihexinole phosphite Dialkyl phosphites such as aitite, dipentinolephosphite and octylphosphite (An alkyl group may be linear or branched); di (alkyl) aryl esters such as diphenyl phosphite and dimethyl phosphite; propyl phosphite, triptinole phosphite, and triphenyl phosphite; Trialkyl phosphites such as pentyl phosphite, trihexyl phosphite, triptyl phosphite and trioctyl phosphite (the alkyl group may be linear or branched); triphenyl phosphite Phosphite tri (alkyl) aryl esters such as tricresyl phosphite; and mixtures thereof.

Examples of the salts of the above-mentioned (sub) phosphoric acid esters include, for example, monoester phosphate, diester phosphate, monoester phosphite, diester phosphite, etc. Salts in which a part or all of the remaining acidic hydrogen is neutralized by the action of a nitrogen compound such as an amine compound containing only a hydrocarbon group or a hydroxyl group-containing hydrocarbon group of 8 in the molecule can be exemplified.

Specific examples of the nitrogen compound include: ammonia; monomethylamine, monoethynoleamine, monopropynoleamine, monobutylamine, monopentylamine, monohexylamine, monoheptylamine, monooctylamine, dimethylamine, methinolethinoamine. Alkylamines such as Reamine, Detinoleamine, Methylpropynoleamine, Ethylpropynoleamine, Dipropylamine, Methylbutyl / reamine, Ethylptylamine, Poutine pinolebutylamine, Diptylamine, Dipentylamine, Dihexylamine, Diheptylamine, Dioctylamine (The alkyl group may be linear or branched); monomethanolamine, monoethanolamine, monopropanolenoamine, monobutanolenoamine, monopen Nonoleamine, monohexanolamine, monoheptananolamine, monooctanolamine, monononanolamine, dimethanolamine, methanolethanolamine, diethanolamine, methanolpropanolamine, ethanolpropanolamine, dipropanol Nonoleamine, methanolbutanol / reamine, ethanolanolbutanoyl / reamine, propanolptanolamine, dibutanolamine, dipentanolamine, dihexanolamine, diheptanolamine, dioctanolamine And alkanolamines such as min (the alkanol group may be linear or branched); and mixtures thereof. One or more of these (F) phosphorus extreme pressure agents can be arbitrarily blended.

When the (F) phosphorus-based extreme pressure agent is contained in the lubricating oil composition of the present invention, its content is not particularly limited, but it is 0.005 to 0.2 as phosphorus element based on the total amount of the lubricating oil composition. mass is preferably ^_0/0. If the phosphorus element content is less than 0.05 mass% / ₀ , there is no effect on wear resistance, and if it exceeds 0.2 mass%, oxidation stability deteriorates, which is not preferable.

In the lubricating oil composition of the present invention, (G) a boron-free ashless dispersant may be used in combination to provide wet friction characteristics, friction characteristics of a wet clutch, antioxidative deterioration during use of lubricating oil, and insoluble matter dispersibility. Is desirable from the viewpoint of improving

Specific examples of the ashless dispersant containing no boron that can be used in combination include the ashless dispersant before modifying this compound with the boron compound in the boron-containing ashless dispersant of the component (E). In the present invention, one kind or two or more kinds of compounds arbitrarily selected from them can be used together in an arbitrary amount. In the present invention, when an ashless dispersant containing no boron is used in combination, the content is usually 0.1 to 10% by mass based on the total amount of the lubricating oil composition.

As the metal-based detergent other than the component (H) and (B) which can be used in combination with the lubricating oil composition of the present invention, any compound usually used as a metal-based detergent for lubricating oils can be used. For example, alkali metal or alkaline earth metal sulfonates, phenates, naphthenates and the like can be mentioned. These can be used alone or in combination of two or more. Examples of the alkali metal include sodium and potassium, and examples of the alkaline earth metal include calcium and magnesium. As a specific metal detergent, sulfonate or phenate of calcium or magnesium is preferably used. The total base number and the amount of these metal-based detergents can be arbitrarily selected according to the required lubricating oil performance.

As the (I) friction modifier which can be used in combination with the lubricating oil composition of the present invention, any compound usually used as a friction modifier for lubricating oils can be used. Compounds having at least one linear alkyl group or linear alkyl group having 6 to 30 carbon atoms in the molecule, particularly an alkyl or alkenyl group of Acid esters, fatty acid amides, fatty acid metal salts and the like.

Examples of the amine compound include linear or branched, preferably linear aliphatic monoamines having 6 to 30 carbon atoms, linear or branched, preferably linear aliphatic polyamines, or these. Examples thereof include an alkylene oxide adduct of an aliphatic amine. Examples of the fatty acid ester include esters of a linear or branched, preferably linear, fatty acid having 7 to 31 carbon atoms and an aliphatic monohydric alcohol or an aliphatic polyhydric alcohol. Examples of the fatty acid amide include an amide of a linear or branched, preferably linear, fatty acid having 7 to 31 carbon atoms and an aliphatic monoamine or an aliphatic polyamine. Examples of the fatty acid metal salt include an alkaline earth metal salt (such as a magnesium salt and a calcium salt) and a zinc salt of a linear or branched, preferably linear, fatty acid having 7 to 31 carbon atoms. Can be

In the present invention, one or two or more compounds arbitrarily selected from these friction modifiers can be contained in an arbitrary amount. It is 0.01 to 5.0% by mass, preferably 0.03 to 3.0% by mass on the basis.

As the (J) antioxidant that can be used in combination with the lubricating oil composition of the present invention, any one commonly used in lubricating oils such as a phenolic compound and a diamine compound can be used.

Specifically, anole quinolephenolenes such as 2-6-di ter't-butyl-1-4-methinolephenol, methylene-1,4,4-bisphenone ((2,6-di-tert-butyl-1-4) Bisphenols such as —methinolephenone), naphthylamines such as phenylenol α-naphthylamine, dialkyldiphenylamines, zinc dialkyldithiophosphates such as zinc di-2-ethylhexyldithiophosphate, (3,5-g tert-butyl-4-hydroxyphenyl) fatty acid (propionic acid, etc.) and a monohydric or polyhydric alcohol such as methanol, octadecanol, 1,6-hexadiol, neopentinoleglyconele, thiojetyleneglyconele, triethylene glycol And esters with pentaerythritol and the like.

One or two or more compounds selected arbitrarily from among these antioxidants can be contained in an arbitrary amount, but the content is usually the total amount of the lubricating oil composition. It is 0.01 to 5.0% by mass based on the amount.

Specific examples of the (K) viscosity index improver that can be used in combination with the lubricating oil composition of the present invention include homopolymers or copolymers of one or more monomers selected from various methacrylates. Examples thereof include a so-called non-dispersion type viscosity index improver such as a hydrogenated product thereof, and a so-called dispersion type viscosity index improver for copolymerizing various methacrylic esters further containing a nitrogen compound. Specific examples of other viscosity index improvers include non-dispersed or dispersed ethylene-polyolefin copolymers (one olefin includes propylene, 1-butene, 1-pentene, etc.) or hydrides thereof. Examples thereof include polyisobutylene or a hydrogenated product thereof, a copolymer of styrene and hydrogenated styrene, a copolymer of styrene and maleic anhydride, and a polyalkylstyrene.

It is necessary to select the molecular weight of these viscosity index improvers in consideration of shear stability. Specifically, the viscosity index improver may have a number average molecular weight of, for example, 5,000 to 150,000, preferably 5,000 to 35,000 in the case of dispersible and non-dispersible polymethacrylates. Is from 800 to 5,000 when polyisobutylene or a hydride thereof is used, preferably 800 to 5,000 when polyisobutylene or a hydride thereof is used. 1150,000, preferably 3,000-12,000.

When an ethylene-α-olefin copolymer or a hydride thereof is used among these viscosity index improvers, a lubricating oil composition having particularly excellent shear stability can be obtained.

In the present invention, one or two or more compounds arbitrarily selected from these viscosity index improvers can be contained in an arbitrary amount. It is 0.1 to 40% by mass based on the composition.

As the (L) defoaming agent that can be used in combination with the lubricating oil composition of the present invention, any compound that is usually used as an antifoaming agent for lubricating oils can be used. Examples thereof include dimethyl silicone and fluorosilicone. And the like. One or two or more compounds selected arbitrarily from these can be contained in any amount, but usually the content is 0.001 to 0.001 based on the total amount of the lubricating oil composition. 0 5 quality %.

(M) Examples of the detergency agent include alcohol succinic acid, alcohol succinic acid ester, polyhydric alcohol ester, petroleum snorrephonate, and dinoninolephthalene sulfonate.

(N) Examples of the corrosion inhibitor include benzotriazole, tolyltriazole, and imidazole compounds.

(O) Pour point depressants include, for example, polymethacrylate-based polymers that are compatible with the lubricating base oil used.

(P) Examples of the rubber swelling agent include aromatic compounds.

The content of the additives of these components (M), (N), (O) and (P) is optional, but the content of the corrosion inhibitor based on the total amount of the composition is usually 0.005 to 0.2 mass%, the content of other additives is 0.005 to 10 mass, respectively. /. Degree.

[Best Mode for Carrying Out the Invention]

Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

(Examples 1 to 8, Comparative Examples 1 to 8)

As shown in Tables 11 and 12, lubricating oil compositions for transmissions of the present invention (Examples 1 to 8) and lubricating oil compositions for comparison as shown in Tables 2-1 and 2_2 (Comparative Examples 1 to 8) were prepared. These lubricating oil compositions were evaluated by performing the following (1) life test of anti-shudder performance and (2) fatigue life test. The results of these evaluations are also shown in Table 11-1, Table 1-2, Table 2-1 and Table 2-2.

(1) Shada one life test

A low-speed sliding test was conducted by changing only the oil temperature during the durability test from 120 ° C to 140 ° C based on the “Test method for preventing oil shudder in automatic transmissions” specified in JASO M349-98. Life of reference oil specified in test method and examples or comparative examples The retention of the anti-shudder performance was evaluated based on the ratio to the life of the composition.

The performance was measured at 0, 6, 12, 24, and every 24 hours thereafter.

If the life was longer than the reference oil (72 hours or more), the lubricating oil composition was judged to have an excellent anti-shudder performance life. The test was aborted if it exceeded four times the reference oil (288 h), and was marked as four or more.

(2) Fatigue life test

Using a two-cylinder fatigue tester as a tester, the fatigue life was measured in the following manner. (Cylindrical)

Material S CM4 3 6

Shape Φ 6 8 mm X 10 mm

Hardness S B 3 00 0 to 3 40

(Test condition)

Circumferential speed: Drive side: 112 2 / s, driven side: 10 mZ s

Oil ¾m. 6 0 ° C

Surface pressure 1 2MPa

(Evaluation criteria)

The time required for surface damage such as pitting to occur on the cylindrical surface was defined as the fatigue life. If the fatigue life was 5 Oh or more, the composition was judged to have a long fatigue life.

table 1.

1) Poly ^{1.8mm 2 / s (100 ° C} ) - a - Orefuin and 4 mm ² / s of (100 ° C) poly - a - Orefuin mixed with prepared

2) Base oil total standard

3) Based on total composition

4) diethylene triamine bis (iso-octadecyl) succinimide

5) tetraethylenepentaminebis (iso-octadecenyl) succinimide

6) Polybutyrsuccinimide (bis type, weight average molecular weight of polybutyl group 1000)

7) Boric acid-modified polybutenyl succinimide (bis type, boron content 0.5% by mass, weight average molecular weight of polyptenyl group 1300)

8) Antioxidants (amines, phenols), seal swelling agents (alomas), friction modifiers (amines + esters), viscosity index improvers and pour point depressants (polymethacrylates)

Table 1-2 Example 5 Example 6 Example 7 Example 8 Example 0/2)

(A) Base oil Refined mineral oil (base oil viscosity (100 ^D C) 4.0mm7s) Yukari / 0 100 100

Refined mineral oil (base oil viscosity (100 ° C) 2.6mm ² / s) mass% ²⁾ --75-Re-olefin (base oil viscosity (100 ° C) 2.6mm ² / s) ^l) mass% ²⁾ _L 1-1 1 75 Refined mineral oil (base oil viscosity (100 ° C) 31mm ² / s) Mass% ² ) 25 25

twenty one

Base oil adjustment viscosity mm / s 4 4 4 4

(B) Calcium salicylate (TBN = 170mgKOH / g) mass% (Ca concentration) ³ ) 0.03 0.03 0.03 0.03

(C) SP type extreme pressure agent trilauryl trithiophosphite mass% concentration) ³ ) 0.02 0.02 0.02 trilauryl dithiophosphite mass% concentration) ³⁾

Di (2-ethylhexyl) dithiophosphate mass% (P concentration) ³⁾ 0.02-Monophosphorus additive Di (2-ethylhexyl) phosphite mass% ³ ) 0.01 0.01 0.01 0.01

(D) Succinimide succinimide A ⁴ ) Tetsuo 0/3)

Yuanli /. 2 2 2

CO

3 Haq acid imide, B ⁵⁾ mass ^_0/0 ³⁾ - 2 - -

(E) Ashless dispersant Borne-containing ashless dispersant ⁶ ) 2 2 2 2 Boron-containing ashless dispersant ⁷⁾ % by mass) ³⁾ 0.005 0.005 0.005 0.005 Other additives Mass ° / 8 8 8 8

(1) Pitching life 102 108 120

(2) Shudder performance with standard oil (72 hours) P-stop performance life ratio 4 <4 <4 <4

1) Prepare by mixing poly-CL-olefin of 1.8 s (100 ° C) and poly-a-olefin of 4 mm s (100 ° C).

2) Base oil total standard

3) Based on total composition

4) diethylene triamine bis (iso-octadecenyl) succinimide

5) tetraethylenepentaminebis (iso-octadecenyl) succinimide

6) Polybutenyl succinimide (bis type, weight average molecular weight of polybutenyl group 1000)

7) Boric acid-modified polybutenyl cono, citimide (bis type, boron content 0.5 mass ⁰ weight average molecular weight of polybutenyl group 1300)

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example

(A) Base oil Refined mineral oil (base oil viscosity (100 ° C) 4.0mmVs) l) 100 100 100 100

(B) Calcium salicylate (TBN = 170mgK〇H / g) mass% (concentration) ²⁾ 0.09 0.03 0.03

(C) SP type extreme pressure agent trilauryl trithiophosphite mass ° /. (P concentration) ²⁾ 0.02 0.02 0.1

Phosphorus additive Di (2-ethylhexyl) phosphite mass% (P concentration) ² ) 0.01 0.01 0.01 0.03

2)

Io-based additives Polyisobutylene sulfide (Io content 45% by mass)

Sulfurized fats and oils (sulphide lard, io content 30 mass%) mass% ²⁾

Factory-2)

(D) succinimide succinimide A ³ ) 2 2 2 2

(E) Ashless dispersant Borne-containing ashless dispersant ⁴ ) Mass% ²⁾ 2 2 2 2 Boron-containing ashless dispersant ⁵⁾ Mass% (B concentration) ² ) 0.005 0.005 0.005 0.005 Other additivesϋ ⁾ 8 8 8 8

(1) Pitching life 52 18 26 32

(2) Ratio of shudder prevention performance life with reference oil (72 hours) 0.33 0.67 0.33 4 <

1) Base oil total amount standard

2) Based on total composition

3) diethylene triamine bis (iso-octadecenyl) succinimide

4) Polybutenyl cono, cinimide (bis type, weight average molecular weight of polybutenyl group 1000)

5) Boric acid-modified polybutenyl succinimide (bis type, boron content 0.5 mass%, weight average molecular weight of polybutenyl group 1300)

6) Antioxidants (amines, phenols), seal swelling agents (aromas), friction modifiers (amines + esters), viscosity index improvers

And pour point depressant (polymethacrylate)

Table 2—2

1) Base oil total amount standard

2) Based on total composition

3) diethylene triamine bis (iso-octadecenyl) succinimide

4) Polybutenyl succinimide (bis type, weight average molecular weight of polyptenyl group 1000)

6) Antioxidants (amines, phenols), seal swelling agents (aromas), friction modifiers (amines + esters), viscosity index improvers and pour point depressants (polymethacrylate)

As is clear from the results shown in Tables 1-1 and 1-2, all of the lubricating oil compositions of Examples 1 to 8 of the present invention have a long anti-shudder prevention performance and a long pitting life. Is shown. In particular, as can be seen from Examples 7 and 8, it can be seen that when a heavy base oil having a high kinematic viscosity is mixed with the base oil, the pitting life is further increased.

On the other hand, as is clear from the results shown in Table 2-1 and Table 2-2, when the content of (B) calcium salicylate is too large (Comparative Example 1), the shudder prevention life is inferior and (B) ) When calcium salicylate is not contained (Comparative Example 2), the pitching life is poor. In addition, when the content of the (C) SP type extreme pressure agent was too large (Comparative Example 3), no satisfactory value was obtained in any of the performances, and when the (C) SP type extreme pressure agent was not contained (Comparative Example 3). In Examples 4 to 6), the pitting life and the shudder prevention life are not compatible. (D) When succinic acid imide was not contained (Comparative Example 7), the anti-shudder life was poor, and (E) when no boron-containing ashless dispersant was contained (Comparative Example 8), the pitting life was poor.

[The invention's effect]

The lubricating oil composition of the present invention has excellent properties such as excellent shudder prevention life and long fatigue life. Accordingly, the lubricating oil composition of the present invention is suitably used as a transmission oil, particularly as a lubricating oil composition for an automatic transmission and a Z or continuously variable transmission, or a transmission having a wet clutch and / or a wet brake. It can be used as a lubricating oil that is required to improve fatigue life by preventing pitting, such as gear oil, lubricating oil for internal combustion engines, hydraulic oil for shock absorbers, compressor oil, etc. .

Claims

The scope of the claims

1. (A) Lubricating base oil, (B) Calcium salicylate having a total base number of 50 to 30 Omg K.OHZ g as elemental calcium based on the total amount of the composition: 0.05 to 0.07 mass% (C) 0.005 to 0.07 mass% of the elemental phosphorus based on the total amount of the SP-based extreme pressure agent based on the total amount of the composition; One or more compounds selected from the group consisting of acid imide compounds are 0.1 to 6% by mass based on the total amount of the composition, and (E) the boron-containing ashless dispersant is the elemental boron based on the total amount of the composition. A lubricating oil composition comprising 0.001 to 0.05 mass% / ₀ .

In (formula (3), R ¹¹ represents a linear or branched carbon hydrocarbon group 8-30 carbon atoms, R ^{1 2} is a hydrogen atom or a carbon number from 1 to 3 0 hydrocarbon Represents a group, R ¹³ represents a hydrocarbon group having 1 to 4 carbon atoms, and m represents an integer of 1 to 7.)

(In the general formula (4), R ¹⁴ and R ¹⁵ each independently represent a straight-chain or branched hydrocarbon group having 8 to 30 carbon atoms, and R ¹⁶ and R ¹⁷ each independently represent a carbon number of 1 to 30. Represents a hydrocarbon group of 4, and η represents an integer of 1 to 7.)

2. (C) The SP type extreme pressure agent is at least one kind selected from the group consisting of a phosphorus compound represented by the general formula (1), a phosphorus compound represented by the general formula (2), and a salt thereof. 2. The lubricating oil composition according to claim 1, which is a compound. 1 1 2 2

R-X-P-X-R

(1)

XR ³

(In the general formula (1), at least one of X ¹ , X ² and X ³ represents a sulfur atom and the other represents an oxygen atom, and RR ² and R ³ each independently represent a hydrogen atom Or a hydrocarbon group having 1 to 30 carbon atoms.)

S

4 4 II 5 5

R-X-P-X-R

6 (2)

6

X-R

(In the general formula (2), X ^4, ⁵ and ^6, respectively independently an oxygen atom or a sulfur atom, R ^4, ⁵ and 1¾ ⁶ are each independently hydrogen atom or a hydrocarbon of a carbon number of 1 to 30 Represents a group.)

3. (A) Lubricating base oil is (A_l) Mineral oil and / or synthetic oil having a kinematic viscosity at 100 ° C of 2 to 6 mm ² Zs is 60 to 99.5 mass% based on the total amount of the base oil, (A-2) A heavy mineral oil having a kinematic viscosity at 100 ° C of 10 to 50 mm ² / s comprising 0.5 to 40% by mass based on the total amount of the base oil. The lubricating oil composition according to the above.

4. The lubricating oil composition according to claim 1, which is used for an automatic transmission or a continuously variable transmission.

5. The lubricating oil composition according to claim 1, which is used for a transmission having a wet clutch or a wet brake.