JP3026195B2 - Lubricating oil composition for automatic transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a lubricating oil composition for an automatic transmission. More specifically, in particular, it has excellent anti-shudder performance and maintains anti-shudder performance for a long time,
The present invention relates to a lubricating oil composition for an automatic transmission having a certain transmission torque capacity.

[0002]

2. Description of the Related Art Conventionally, automatic transmissions for automobiles have been required to have thermal oxidation stability, abrasion resistance, friction characteristics of a wet clutch, and the like. Various additives such as an antioxidant, a detergent / dispersant, an antiwear agent, a friction modifier, a seal swelling agent, a viscosity index improver, an antifoaming agent, and a coloring agent are appropriately blended.

[0003] Recent automobile transmissions are demanded to be lighter and smaller and have higher torque capacity. Automatic transmission oils are required to have a performance to increase the friction coefficient of a wet clutch. At the same time, there is a demand for excellent anti-shudder performance for slip control of the starting clutch and the lock-up clutch, and for maintaining this anti-shudder performance for a long period of time. As a measure for maintaining the anti-shudder performance for a long time, a method of adding a large amount of a friction modifier can be considered. However, this method is not a fundamental solution because the friction coefficient of the clutch decreases and the torque capacity of the transmission decreases.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lubrication system for an automatic transmission which has an excellent anti-shudder function, can maintain this anti-shudder performance for a long period of time, and has a certain transmission torque capacity. It is to provide an oil composition.

[0005]

That is, according to the present invention, there is provided:
(A) 0.01 to 5% by mass of calcium salicylate, (C) 0.01 to 5% by mass of magnesium sulfonate, and (D) 6 to 6 carbon atoms in a lubricating base oil based on the total amount of the composition. (E) boric acid-modified succinimide containing 0.01 to 3% by mass of a friction modifier having 30 alkyl groups or alkenyl groups in the molecule and having no hydrocarbon group having 31 or more carbon atoms in the molecule; 250-500p in terms of boron
The present invention provides a lubricating oil composition for an automatic transmission containing pm.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The lubricating base oil, which is the component (A) of the present invention, is usually used as a base oil of an automatic transmission oil,
Both mineral oil and synthetic oil can be used. As a mineral oil, obtained by a method usually performed in a lubricating oil production process of the petroleum refining industry, for example, a lubricating oil fraction obtained by atmospheric distillation and vacuum distillation of crude oil, solvent removal, solvent extraction, Base oils such as paraffinic and naphthenic base oils which are purified by appropriately combining refining treatments such as hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid washing, and clay treatment are exemplified. As synthetic oils, for example, poly-α-olefins such as polybutene, 1-octene oligomer, 1-decene oligomer or hydrides thereof; alkylbenzene; alkylnaphthalene; ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridecyl Diesters such as adipate and di-3-ethylhexyl sebacate; polyol esters such as trimethylolpropane caprylate, trimethylolpropaneperargonate, pentaerythritol-2-ethylhexanoate, and pentaerythritol perargonate; polyoxyalkylene glycol; dialkyldiphenyl ether And the like. These base oils may be used alone or in combination of two or more.

The kinematic viscosity of the component (A) at 100 ° C. is not particularly limited, but is usually 1 to 10 mm ² / s, preferably ² to 6 mm ² / s. The viscosity index of the component (A) is not particularly limited, but is usually 70 or more, preferably 90 or more.
That is all.

The calcium salicylate which is the component (B) of the present invention includes neutral calcium salicylate, basic calcium salicylate, carbonate overbased (ultrabasic) calcium salicylate, borate overbased (ultrabasic) ) Calcium salicylate or a mixture thereof.

The method for producing the component (B) 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 in the presence of elemental sulfur. Under or in the absence,
It can be produced by a method of reacting with a calcium base (such as a calcium oxide or hydroxide). Examples of the alkyl group of the alkyl salicylic acid include, for example, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group, henycosyl group, docosyl group, Examples include a tricosyl group, a tetracosyl group, a pentacosyl group, a hexacosyl group, a heptacosyl group, an octacosyl group, a nonacosyl group, and a triacontyl group. Among them, a tetradecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group and an octadecyl group 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 borate overbased (ultrabasic) salicylate is obtained by reacting the neutral (normal salt) calcium salicylate with a calcium base and a boric acid compound such as boric acid or boric anhydride, or the carbonic acid It can be produced by a method of reacting a salt overbased (ultrabasic) calcium salicylate with a boric acid compound such as boric acid or boric anhydride.

The basicity of the component (B) is not particularly limited, but the total base number by the hydrochloric acid method is usually 0 to 500 mg KOH.
/ G, preferably 100 to 300 mgKOH / g. The total base number by the hydrochloric acid method is defined by JIS K25
01 (1996) "Petroleum products and lubricating oils-Neutralization number test method" means a value measured in accordance with the method specified.

In the present invention, the content of the component (B) is
Based on the total amount of the composition, the lower limit is 0.01% by mass, preferably 0.1% by mass, while the upper limit is
It is 5% by mass, preferably 2% by mass. When the content of the component (B) is less than 0.01% by mass, the friction adjusting function is insufficient, and the life of the shudder becomes short. On the other hand, if it exceeds 5% by mass, the calcium salt generated when the calcium salicylate (B) is decomposed may clog the pores of the wet friction clutch and change the friction coefficient.

As the magnesium sulfonate which is the component (C) of the present invention, neutral sulfonate, basic sulfonate, carbonate overbased (ultrabasic) sulfonate, borate overbased (ultrabasic) sulfonate or These mixtures and the like can be mentioned.

The method for producing the component (C) is not particularly limited. For example, the basic magnesium sulfonate can be produced by heating a neutral (normal salt) magnesium sulfonate and an excess of a magnesium salt or base in the presence of water. The carbonate overbased (ultrabasic) magnesium sulfonate can be produced by, for example, a method of reacting neutral (normal salt) magnesium sulfonate with a magnesium base in the presence of carbon dioxide gas. The borate overbased (ultrabasic) sulfonate is obtained by reacting a neutral (normal salt) magnesium sulfonate with a magnesium base and a boric acid compound such as boric acid or boric anhydride; It can be produced by a method of reacting a basic (super basic) magnesium sulfonate with a boric acid compound such as boric acid or boric anhydride.

The neutral (normal salt) magnesium sulfonate used for the production of the component (C) has, for example, a molecular weight of 30.
It is obtained by a method of sulfonating an alkyl aromatic of 0 to 1500, preferably 400 to 700 with fuming sulfuric acid or sulfuric anhydride to obtain an alkyl aromatic sulfonic acid, and then converting it to a magnesium salt. Examples of a method for converting the alkyl aromatic sulfonic acid into neutral (normal salt) magnesium sulfonate include a method for directly converting to a metal salt, and a metathesis method for once converting to a sodium salt and then reacting with a target magnesium compound. No. Examples of the alkyl aromatic sulfonic acid include petroleum sulfonic acid and synthetic sulfonic acid. As petroleum sulfonic acid,
In general, there are sulfonated alkyl aromatics in the lubricating oil fraction of mineral oil and mahoganic acid which is a by-product of white oil production. On the other hand, as the synthetic sulfonic acid, for example, alkylbenzene having a linear or branched alkyl group, which is obtained as a by-product from an alkylbenzene production plant used as a raw material of a detergent or obtained by alkylating a polyolefin to benzene, is used. Examples thereof include those obtained by sulfonation and those obtained by sulfonating alkylnaphthalene such as dinonylnaphthalene.

The basicity of the component (C) is not particularly limited, but it is generally 0 to 500 mg KOH
/ G, preferably 50-300 mgKOH / g.

The lower limit of the content of component (C) is 0.01% by mass, preferably 0.1% by mass, based on the total amount of the composition, while the upper limit is 5% by mass, preferably Is 2% by mass. The content ratio of the component (C) is 0.0
If the amount is less than 1% by mass, the friction adjusting function is insufficient, and the life of the shudder becomes short. On the other hand, if the content exceeds 5% by mass, magnesium salts generated when magnesium sulfonate is decomposed may clog the pores of the wet friction clutch and change the friction coefficient. However, there is a risk of adverse effects.

The component (D) used in the present invention has 6 to 6 carbon atoms.
A friction modifier which has at least one alkyl or alkenyl group of 30 in the molecule and does not contain a hydrocarbon group having 31 or more carbon atoms in the molecule. The lower limit of the carbon number of the alkyl group or the alkenyl group is 6, preferably 9, while the upper limit is 30, preferably 24. When the number of carbon atoms of the alkyl group or the alkenyl group is less than 6, or 30
When the ratio exceeds, the friction characteristics of the wet clutch deteriorate. When the component (D) contains a hydrocarbon group having 31 or more carbon atoms, the friction characteristics of the wet clutch may be deteriorated.

The alkyl group or alkenyl group of the component (D) may be linear or branched, for example, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, Tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, icosyl,
Alkyl groups such as henycosyl group, docosyl group, tricosyl group, tetracosyl group, pentacosyl group, hexacosyl group, heptacosyl group, octacosyl group, nonacosyl group, triacontyl group; hexenyl group, heptenyl group, octenyl group, nonenyl group, decenyl group, undecenyl Group,
Dodecenyl group, tridecenyl group, tetradecenyl group, pentadecenyl group, hexadecenyl group, heptadecenyl group, octadecenyl group, nonadecenyl group, icosenyl group, henicocenyl group, docosenyl group, tricosenyl group, tetracosenyl group, pentacosenyl group, hexacocenyl group, heptacosenyl group And alkenyl groups such as nonacocenyl group and triacontenyl group.

As the component (D), for example, (D-1)
An amine compound or a derivative thereof having at least one alkyl group or alkenyl group having 6 to 30 carbon atoms in the molecule, and containing no hydrocarbon group having 31 or more carbon atoms in the molecule;
(D-2) a phosphorus compound or a derivative thereof having at least one alkyl group or alkenyl group having 6 to 30 carbon atoms in the molecule and containing no hydrocarbon group having 31 or more carbon atoms in the molecule; 3) an amide of a fatty acid or a metal salt of a fatty acid having at least one alkyl group or alkenyl group having 6 to 30 carbon atoms in the molecule and not having a hydrocarbon group having 31 or more carbon atoms in the molecule; Compounds selected from the group consisting of a mixture, and the like are included.

As the amine compound (D-1),
Examples thereof include a fatty acid monoamine represented by the following formula (1) or an alkylene oxide adduct thereof, an aliphatic polyamine represented by the following formula (2), and an imidazoline compound represented by the formula (3).

[0021]

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In the formulas (1) to (3), R ¹ , R ⁶ and R
¹⁰ independently represents an alkyl group or an alkenyl group having 6 to 30 carbon atoms, preferably 9 to 24 carbon atoms. When the carbon number of the alkyl group or the alkenyl group is less than 6 or more than 30, the friction characteristics of the wet clutch may be deteriorated.
R ² , R ³ , R ⁷ and R ¹¹ each independently represent an ethylene group or a propylene group; R ⁴ , R ⁵ , R ⁸ , R ⁹ and R ¹² each independently represent a hydrogen atom or a carbon atom A represents a hydrocarbon group of 30; a, b and d each independently represent a number from 0 to 10, preferably from 0 to 6, and a + b represents a number from 0 to 10, preferably from 0 to 6; c is a number of 1 to 5, preferably 1 to 4
The number of each is shown.

The alkyl group or alkenyl group of R ¹ , R ⁶ and R ¹⁰ may be linear or branched, and includes the various alkyl groups or alkenyl groups exemplified above. In particular, a linear alkyl group or alkenyl group having 12 to 18 carbon atoms such as a lauryl group, a myristyl group, a palmityl group, a stearyl group, and an oleyl group is particularly preferred from the viewpoint of excellent frictional characteristics.

R ⁴ , R ⁵ , R ⁸ , R ⁹ and R ¹² include, for example, a hydrogen atom; methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, s
ec-butyl, tert-butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl Group, nonadecyl group, icosyl group,
Linear or branched alkyl groups such as henycosyl group, docosyl group, tricosyl group, tetracosyl group, pentacosyl group, hexacosyl group, heptacosyl group, octakosyl group, nonacosyl group, triacontyl group; butenyl group, pentenyl group, hexenyl group , Heptenyl group, octenyl group, nonenyl group, decenyl group, undecenyl group, dodecenyl group, tridecenyl group, tetradecenyl group, pentadecenyl group, hexadecenyl group, heptadecenyl group, octadecenyl group, nonadecenyl group, icosenyl group, hecocenyl group, docosenyl group Linear or branched alkenyl groups such as a group, a tetracosenyl group, a pentacosenyl group, a hexacosenyl group, a heptacosenyl group, an octacosenyl group, a nonacosenyl group and a triacontenyl group; cyclopentyl , A cycloalkyl group having 5 to 7 carbon atoms such as a cyclohexyl group and a cycloheptyl group; methylcyclopentyl group, dimethylcyclopentyl group, methylethylcyclopentyl group, diethylcyclopentyl group, methylcyclohexyl group, dimethylcyclohexyl group, methylethylcyclohexyl group, diethyl An alkylcycloalkyl group having 6 to 11 carbon atoms such as a cyclohexyl group, a methylcycloheptyl group, a dimethylcycloheptyl group, a methylethylcycloheptyl group, and a diethylcycloheptyl group (these include all structural isomers);
Aryl groups such as naphthyl group; tolyl group, xylyl group, ethylphenyl group, propylphenyl group, butylphenyl group, pentylphenyl group, hexylphenyl group, heptylphenyl group, octylphenyl group, nonylphenyl group, decylphenyl group, C7-C18 alkylaryl groups such as decylphenyl group and dodecylphenyl group (these may be linear or branched and include all structural isomers); benzyl group, phenylethyl group, phenylpropyl And arylalkyl groups having 7 to 12 carbon atoms (including isomers of the alkyl groups among them) such as a group, a phenylbutyl group, a phenylpentyl group, and a phenylhexyl group.

As the aliphatic monoamine represented by the formula (1) or the alkylene oxide adduct thereof, R ⁴ in the formula (1) is superior in terms of friction characteristics of a wet clutch.
And R ⁵ are independently a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and an aliphatic monoamine wherein a = b = 0,
Alternatively, R ⁴ and R ⁵ in the formula (1) are hydrogen atoms, and a and b are independently a number of 0 to 6, and a + b =
An alkylene oxide adduct of an aliphatic monoamine having a number of 1 to 6 is more preferable. As the aliphatic polyamine represented by the formula (2), R ⁸ and R ⁹ in the formula (2) are each independently a hydrogen atom or an alkyl group having 1 to 6 carbon atoms in that the friction characteristics of the wet clutch are more excellent. Certain aliphatic polyamines are more preferred. As the imidazoline compound represented by the formula (3), an imidazoline compound in which R ¹² in the formula (3) is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms is more preferable because the friction characteristics of a wet clutch are more excellent. No.

On the other hand, as the derivative of the amine compound (D-1), for example, the amine compounds represented by the formulas (1) to (3) may be added to a monocarboxylic acid having 2 to 30 carbon atoms (such as a fatty acid); By reacting a polycarboxylic acid having 2 to 30 carbon atoms such as oxalic acid, phthalic acid, trimellitic acid and pyromellitic acid to neutralize a part or all of the remaining amino group and / or imino group, A modified acid-modified compound;
A boric acid-modified compound in which boric acid acts on the amine compound represented by any of formulas (1) to (3) to neutralize a part or all of the remaining amino group and / or imino group;
The amine compound represented by (3) has one or two hydrocarbon groups having 1 to 30 carbon atoms in its molecule, does not contain a hydrocarbon group having 31 or more carbon atoms, and has at least one hydroxyl group. A phosphoric acid ester salt obtained by neutralizing a part or all of the remaining amino group and / or imino group by the action of an acidic phosphoric acid ester or an acid phosphite ester having the same;
Or an alkylene oxide adduct of an amine compound obtained by reacting the amine compound shown in (3) with an alkylene oxide such as ethylene oxide or propylene oxide;
Modified products of an amine compound obtained by combining two or more types of modifications selected from the above are exemplified.

The derivatives of the amine compound (D-1) include, for example, laurylamine, lauryldiethylamine, lauryldiethanolamine, dodecyldipropanolamine, palmitylamine, and the like, because of their excellent friction characteristics in wet brakes and wet clutches. Amine compounds such as stearylamine, stearyltetraethylenepentamine, oleylamine, oleylpropylenediamine, oleyldiethanolamine, N-hydroxyethyloleylimidazoline; alkylene oxide adducts of these amine compounds; these amine compounds and di-2-ethylhexyl phosphate With an acidic phosphite such as diphosphoric acid ester or di-2-ethylhexyl phosphite; alkylene oxides of these amine compounds and amine compounds (Nitrite) boric acid-modified products of phosphoric acid ester salt of de adducts or amine compound; or mixtures thereof particularly preferred.

As the phosphorus compound (D-2), for example, a phosphoric ester represented by the formula (4) or a phosphoric acid ester represented by the formula (5)
And the like.

[0029]

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In the formulas (4) and (5), R ¹³ and R ¹⁶ are
And independently represents an alkyl group or an alkenyl group having 6 to 30 carbon atoms, preferably 9 to 24 carbon atoms, and R ¹⁴ , R ¹⁵ , R ¹⁷ and R
¹⁸ independently represents a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms, and X ¹ , X ² , X ³ , X ⁴ , X ⁵ , X ⁶ and X ⁷ are
And independently represents an oxygen atom or a sulfur atom; X ¹ , X ² , X ³
And at least one of X ⁴ is an oxygen atom, and at least one of X ⁵ , X ⁶ and X ⁷ is an oxygen atom. When the number of carbon atoms of the alkyl group or alkenyl group of R ¹³ and R ¹⁶ is less than 6 or more than 30, the friction characteristics of the wet clutch are undesirably deteriorated.

The alkyl group or alkenyl group of R ¹³ and R ¹⁶ may be linear or branched, and includes the above-mentioned various alkyl groups or alkenyl groups. Particularly, depending on the friction characteristics of wet brakes and wet clutches. Lauryl, myristyl, palmityl, stearyl,
A linear alkyl group or alkenyl group having 12 to 18 carbon atoms such as an oleyl group is preferred.

R ¹⁴ , R ¹⁵ , R ¹⁷ and R ¹⁸ are, for example, a hydrogen atom; a methyl group, an ethyl group, an n-propyl group,
Isopropyl group, n-butyl group, isobutyl group, sec
-Butyl group, tert-butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group,
Undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, eicosyl group, henycosyl group, docosyl group, tricosyl group, tetracosyl group, pentacosyl group, hexacosyl group, heptacosyl group Linear or branched alkyl groups such as octacosyl group, nonacosyl group and triacontyl group; butenyl group, pentenyl group, hexenyl group, heptenyl group, octenyl group, nonenyl group, decenyl group, undecenyl group, dodecenyl group, tridecenyl Group, tetradecenyl group, pentadecenyl group, hexadecenyl group, heptadecenyl group, octadecenyl group, nonadecenyl group, icosenyl group, henicocenyl group, docosenyl group, tricosenyl group, tetracosenyl group, pentacoscene A linear or branched alkenyl group such as a cyclopentyl group, a cyclohexyl group or a cycloheptyl group; a cycloalkyl group having 5 to 7 carbon atoms such as a cyclopentyl group, a cyclohexyl group or a cycloheptyl group; Alkyl group; methylcyclopentyl group, dimethylcyclopentyl group, methylethylcyclopentyl group, diethylcyclopentyl group, methylcyclohexyl group, dimethylcyclohexyl group, methylethylcyclohexyl group, diethylcyclohexyl group, methylcycloheptyl group, dimethylcycloheptyl group, methylethylcyclo An alkylcycloalkyl group having 6 to 11 carbon atoms such as a heptyl group and a diethylcycloheptyl group (these include all structural isomers); a phenyl group,
Aryl groups such as naphthyl group; tolyl group, xylyl group, ethylphenyl group, propylphenyl group, butylphenyl group, pentylphenyl group, hexylphenyl group, heptylphenyl group, octylphenyl group, nonylphenyl group, decylphenyl group, C7-C18 alkylaryl groups such as decylphenyl group and dodecylphenyl group (these may be linear or branched and include all structural isomers); benzyl group, phenylethyl group, phenylpropyl And arylalkyl groups having 7 to 12 carbon atoms (including isomers of alkyl groups) such as a phenylbutyl group, a phenylpentyl group, and a phenylhexyl group.

As the phosphorus compound (D-2), for example, an acidic phosphoric acid ester in which at least one of R ¹⁴ and R ¹⁵ in the formula (4) is a hydrogen atom; An acidic phosphite in which at least one of R ¹⁷ and R ¹⁸ in the formula (5) is a hydrogen atom is more preferable. On the other hand, (D-
As the derivative of the phosphorus compound of 2), for example, a compound represented by the formula (4)
Wherein at least one of R ¹⁴ and R ¹⁵ is a hydrogen atom, or R ¹⁷ in the formula (5)
And an acidic phosphite in which at least one of R ¹⁸ is a hydrogen atom, a nitrogen-containing compound such as an amine compound containing only ammonia or a hydrocarbon group having 1 to 8 carbon atoms or a hydroxyl group-containing hydrocarbon group in the molecule. Examples of such salts include salts in which some or all of the remaining acidic hydrogen is neutralized by acting. Examples of the nitrogen-containing compound include ammonia; monomethylamine, monoethylamine, monopropylamine, monobutylamine, monopentylamine, monohexylamine, monoheptylamine, monooctylamine, dimethylamine, methylethylamine, diethylamine, and methylpropyl. Amines, ethylpropylamine, dipropylamine, methylbutylamine, ethylbutylamine,
Alkylamines such as propylbutylamine, dibutylamine, dipentylamine, dihexylamine, diheptylamine, and dioctylamine (the alkyl group may be linear or branched); monomethanolamine, monoethanolamine, monopropanolamine, monoamine Butanolamine, monopentanolamine, monohexanolamine, monoheptanolamine, monooctanolamine, monononanolamine, dimethanolamine, methanolethanolamine, diethanolamine, methanolpropanolamine, ethanolpropanolamine, dipropanolamine, methanolbutanolamine , Ethanol butanolamine, propanol butanolamine, dibutanolamine, dipentanolamine, dihexanol Amine, di heptanol amine, alkanolamines such as di-octanol amine (alkanol group may be and straight-chain or branched) or mixtures thereof.

Specific examples of the phosphorus compound (D-2) or a derivative thereof include, for example, monolauryl phosphate, dilauryl phosphate, and monostearyl phosphate from the viewpoint of excellent friction characteristics of a wet brake or a wet clutch. , Distearyl phosphate, monooleyl phosphate, dioleyl phosphate, monolauryl phosphite, dilauryl phosphite,
Monostearyl phosphite, distearyl phosphite, monooleyl phosphite, dioleyl phosphite, monolauryl thiophosphate, dilauryl thiophosphate, monostearyl thiophosphate, distearyl thiophosphate,
Monooleyl thiophosphate, dioleyl thiophosphite, monolauryl thiophosphite, dilauryl thiophosphite, monostearyl thiophosphite, distearyl thiophosphite, monooleyl thiophosphite, Preferred examples thereof include dioleylthiophosphite, a phosphate thereof, a phosphite, a thiophosphate, and an amine salt of a thiophosphite (such as a mono-2-ethylhexylamine salt), or a mixture thereof. .

The alkyl or alkenyl group of the fatty acid has 6 to 30 carbon atoms, preferably 9 to 24 carbon atoms. If the alkyl group or alkenyl group has less than 6 or more than 30 carbon atoms, the friction characteristics of the wet clutch deteriorate, which is not preferable. The fatty acid may be a straight-chain fatty acid or a branched fatty acid, or may be a saturated fatty acid or an unsaturated fatty acid. For example, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid, heptadecanoic acid, octadecanoic acid, nonadecanoic acid, icosanoic acid, henicosanoic acid, docosanoic acid, Saturated fatty acids such as trichosanoic acid, tetracosanoic acid, pentacosanoic acid, hexacosanoic acid, heptacosanoic acid, octacosanoic acid, nonacosanoic acid, and triacontyl acid (these may be either linear or branched); heptenoic acid, octenoic acid, nonene Acid, decenoic acid, undecenoic acid, dodecenoic acid, tridecenoic acid, tetradecenoic acid, pentadecenoic acid, hexadecenoic acid, heptadecenoic acid, octadecenoic acid, nonadenoic acid, icosenoic acid, henicicosenic acid, docosenic acid, tricosenoic acid, tetracosenoic acid, pentacos Phosphate, hexacosenoic acid, heptacosenoic acid, octacosenoic acid, nonacosenoic acid, unsaturated fatty acids such as triacontene acid (these may be either linear or branched)
And the like. In particular, lauric acid, myristic acid, palmitic acid,
Derived from stearic acid, oleic acid, various fats and oils,
Preferable examples include linear fatty acids such as coconut oil fatty acids, and mixtures of linear fatty acids and branched fatty acids synthesized by the oxo method and the like.

The fatty acid amide (D-3) includes, for example, only the above-mentioned fatty acid and its acid chloride, ammonia, and a hydrocarbon group having 1 to 8 carbon atoms or a hydroxyl group-containing hydrocarbon group in the molecule. An amide obtained by reacting with a nitrogen-containing compound such as an amine compound is exemplified. Examples of the nitrogen-containing compound include ammonia; monomethylamine, monoethylamine, monopropylamine, monobutylamine, monopentylamine, monohexylamine,
Monoheptylamine, monooctylamine, dimethylamine, methylethylamine, diethylamine, methylpropylamine, ethylpropylamine, dipropylamine, methylbutylamine, ethylbutylamine, propylbutylamine, dibutylamine, dipentylamine,
Alkylamines such as dihexylamine, diheptylamine and dioctylamine (the alkyl groups may be linear or branched); monomethanolamine, monoethanolamine, monopropanolamine, monobutanolamine, monopentanolamine , Monohexanolamine, monoheptanolamine, monooctanolamine, monononanolamine, dimethanolamine, methanolethanolamine, diethanolamine, methanolpropanolamine, ethanolpropanolamine, dipropanolamine, methanolbutanolamine, ethanolbutanolamine, propanolbutanol Amine, dibutanolamine, dipentanolamine, dihexanolamine, diheptanolamine,
Examples thereof include alkanolamines such as dioctanolamine (these alkanol groups may be linear or branched) or mixtures thereof.

Specific examples of the fatty acid amide (D-3) include, for example, those having excellent friction characteristics of a wet clutch.
Lauric amide, lauric diethanolamide, lauric monopropanolamide, myristic amide, myristic diethanolamide, myristic monopropanolamide, palmitic amide, palmitic diethanolamide, palmitic monopropanolamide, stearic amide, stearin Acid diethanolamide, stearic acid monopropanolamide, oleic acid amide, oleic acid diethanolamide, oleic acid monopropanolamide, coconut oil fatty acid amide,
Coconut oil fatty acid diethanolamide, coconut oil fatty acid monopropanolamide, a synthetic mixed fatty acid amide having 12 or 13 carbon atoms, a synthetic mixed fatty acid diethanolamide having 12 or 13 carbon atoms, a synthetic mixed fatty acid monopropanolamide having 12 or 13 carbon atoms, or Preferred are mixtures thereof.

Examples of the fatty acid metal salt (D-3) include alkaline earth metal salts (eg, magnesium salt and calcium salt) and zinc salt of the above fatty acids. Specifically, for example, calcium laurate, calcium myristate, calcium palmitate, calcium stearate, calcium oleate, calcium cocoate,
C12 or C13 synthetic mixed fatty acid calcium, zinc laurate, zinc myristate, zinc palmitate, zinc stearate, zinc oleate, zinc coconut oil fatty acid,
Preferred are synthetic mixed fatty acid zinc having 12 or 13 carbon atoms, or a mixture thereof.

The lower limit of the content of the component (D) in the lubricating oil composition of the present invention is 0.01% by mass, preferably 0.1% by mass, based on the total amount of the composition, while the upper limit is Is 3% by mass, preferably 1% by mass.
When the content of the component (D) is less than 0.01% by mass, the friction adjusting function is insufficient, and the life of the shudder is shortened. When the content exceeds 3% by mass, the friction coefficient is greatly reduced and the torque capacity is reduced. May run out.

The component (E) of the present invention is a boric acid-modified succinimide. Examples of the component (E) include a compound obtained by modifying a monoimide represented by the following formula (6) and / or a bisimide represented by the formula (7) with boric acid. The lower limit of the number average molecular weight of the component (E) is preferably 5,000, more preferably 5,500, while the upper limit is preferably 7000, more preferably 6,000. The boron content of the component (E) has a lower limit of preferably 0.05% by mass, more preferably 0.1% by mass,
On the other hand, the upper limit is preferably 5% by mass, more preferably 4% by mass.
% By mass.

[0041]

Embedded image

In the formula (6) or (7), R ¹⁹ , R ²⁰ and R ²¹ separately represent a polybutenyl group having a number average molecular weight of 900 to 3500. n represents a number of 2 to 5, preferably 4 or 5. The method for producing monoimide and / or bisimide is not particularly limited. For example, a number average molecular weight of 900 to 350
It is obtained by reacting polybutenyl succinic acid obtained by reacting polybutene of 0 or chlorinated polybutene having a number average molecular weight of 900 to 3500 with maleic anhydride at 100 to 200 ° C. with polyamine. At this time, examples of the polyamine include diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and pentaethylenehexamine.

The lower limit of the content of the component (E) in the lubricating oil composition of the present invention is 250 mass ppm, preferably 300 mass ppm, in terms of boron, based on the total amount of the composition. The upper limit is 500 mass pp
m, preferably 400 ppm by mass. When the content of the component (E) is less than 250 ppm by mass, the torque capacity is low, and when it exceeds 500 ppm by mass, the pores of the wet friction clutch may be clogged and the friction coefficient may be changed.

In the composition of the present invention, known additives and the like can be used, if necessary, in order to further enhance the excellent performance. These additives include, for example, metal-based detergents such as alkaline earth metal salicylates other than calcium salicylate, alkaline earth metal sulfonates other than magnesium sulfonate, alkaline earth metal phenates, phosphonates, carboxylates, etc .; alkenyl succinimides Dispersants other than the component (E) of the present invention, such as alkylamines, alkylpolyamines, aminoamides or modified products thereof; antioxidants such as hindered phenols and aromatic amines; Anti-wear agents such as acid esters; friction modifiers other than the component (D) of the present invention, such as fatty acids, fatty acid esters, higher alcohols and acidic phosphate esters; metal deactivators;
Rust inhibitors; viscosity index improvers; pour point depressants; seal swelling agents; antifoaming agents and the like, and these can be added alone or in combination of two or more.

The content ratio when the viscosity index improver is contained is usually from 1 to 30% by mass based on the total amount of the composition, and the content ratio when the antifoaming agent is contained is based on the total amount of the composition. Usually, 0.0001 to 1% by mass, and the content ratio when the metal deactivator is contained, usually 0.005 to 1% by mass, based on the total amount of the composition, containing other additives other than these. The content ratio in such a case is usually 0.1 to 15% by mass based on the total amount of the composition.

[0046]

The lubricating oil composition for an automatic transmission according to the present invention comprises:
Calcium salicylate, magnesium sulfonate,
Since it contains a specific friction modifier and boric acid-modified succinimide in a specific ratio, it has excellent anti-shudder performance by using it for lubricating oil for automatic transmissions, and maintains this anti-shudder performance for a long time And a certain transmission torque capacity is exhibited. Further, the automatic transmission oil composition of the present invention can be suitably used not only as an automatic transmission but also as a lubricating oil for a belt-type continuously variable transmission.

[0047]

The present invention will be described below in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto. Example 1, Comparative Examples 1 to 3 A lubricating oil composition having the composition shown in Table 1 was prepared. Two friction tests were performed. Table 2 shows the results of the test for evaluating the actual life of the shudder. Table 3 shows the results of the 2 friction test.

<Evaluation Test of Actual Machine for Shader Life> A 1.5-liter four-cylinder engine was used as an engine for evaluation, and an automatic transmission with a wet clutch was used as a transmission for evaluation. The engine cooling water temperature at the time of evaluation was 8
0 ° C., the engine oil temperature was 90 ° C., the transmission oil temperature was 120 ° C., and each lubricating oil composition shown in Table 1 was used as the transmission oil.
And the shudder life was μ ₂ / μ ₅₀ ≧
The evaluation was made based on the number of cycles up to 1.0. The time required for one cycle was 30 minutes.

<SAE No. 2 friction test> test load 3.0 kg / cm ² , oil temperature 100 ° C., oil amount 700 ml,
The test was performed up to a total of 3000 cycles under the conditions of a dynamic cycle speed of 3000 rpm and a static cycle speed of 0.7 rpm.
500 cycles and at the dynamic friction coefficient at the time of 3000 cycles (μ _d), were measured static friction coefficient (mu _s) and static friction coefficient / kinetic friction coefficient (μ ₀ / μ _d).

[0050]

[Table 1]

[0051]

[Table 2]

[0052]

[Table 3]

From the results shown in Tables 2 and 3, the composition of Example 1 had a long shudder life in the test for evaluating the actual shudder life. The two-friction test showed a certain torque capacity and was excellent. On the other hand, Comparative Example 1 did not use magnesium sulfonate as a metal-based detergent , but was replaced with calcium salicylate. In the 2 friction test, μs representing the torque capacity was low and inferior. In Comparative Example 2, the metal detergent was replaced with magnesium sulfonate without using calcium salicylate. 2 μs in friction test
However, as in Comparative Example 1, the shudder life was short and inferior. Comparative Example 3 did not use a friction modifier, but compared with that of Example 1 in SAEN.
o. 2 μs and μd in the friction test are very high,
0 / μd was high, and the life was extremely short and inferior .

[Brief description of the drawings]

FIG. 1 is a chart showing the conditions of one cycle of a shudder life evaluation test performed in an example.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI C10M 159/22 C10M 159/22 159/24 159/24 // C10N 10:04 30:04 30:06 40:04 60:14 (72) Inventor Junpei Yoshida 1-4-1 Chuo, Wako-shi, Saitama Pref.Honda R & D Co., Ltd. (72) Inventor Yasuo Hirao 1-4-1 Chuo Wako-shi, Saitama Pref. ) Inventor Akira Yaguchi 8 Chidori-cho, Naka-ku, Yokohama-shi, Kanagawa Prefecture, Japan Petroleum Corporation Central Technology Research Institute (72) Inventor Osamu Kurosawa, 8-8 Chidori-cho, Naka-ku, Yokohama City, Kanagawa Prefecture Japan Petroleum Corporation Central Technology Research Institute (56 References JP-A-9-263782 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C10M 129/44 C10M 133/16 C10M 135/10 C10M 139/00 C10M 159/22 C10M 159/24 C10N 40:04

Claims (1)

(57) [Claims] (1) 0.01 to 5% by weight of (B) calcium salicylate, 0.01 to 5% by weight of (C) magnesium sulfonate, (D) ) 0.01 to 3% by mass of a friction modifier which has an alkyl group or an alkenyl group having 6 to 30 carbon atoms in the molecule and does not contain a hydrocarbon group having 31 or more carbon atoms in the molecule.
And (E) a lubricating oil composition for an automatic transmission, containing 250 to 500 ppm of boric acid-modified succinimide in terms of boron.