JP2001055591A - Traction drive fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a traction drive fluid which is excellent in power transmission capability, hydraulic-pressure control capability, and wet-clutch control capability by incorporating a specific naphthene-ring-containing compound into the same. SOLUTION: In addition to a naphthene-ring-containing compound represented by the formula, this traction drive fluid contains a mineral oil, a synthetic oil (A) having a mol.wt. of 150-800, a viscosity index improver (B) having a number average mol.wt. of 800-150,000, an ashless dispersant (C), a phosphorus- base additive (D), a friction modifier (E) having at least one 3-6C alkyl or alkenyl group, and a metal-base detergent (F) having a total base number of 20-450 mgKOH/g. The drive fluid contains 1-99 mass % ingredient A, 0.1-20 mass % ingredient B, 0.01-10 mass % ingredient C, 0.005-0.2 mass % ingredient D, 0.005-3 mass % ingredient E, and 0.01-5 mass % ingredient F. If necessary, the fluid further contains an antioxidant, an extreme pressure agent, a corrosion preventive, a rubber-swelling agent, etc. In the formula, R1 is a 1-8C alkyl; and R2 to R8 are each H or a 1-8C alkyl.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traction drive fluid, and more particularly to a traction drive type continuously variable transmission for an automobile.
The present invention relates to a traction drive fluid that can be used not only for a power transmission mechanism but also for a hydraulic control mechanism and a friction characteristic control mechanism of a wet clutch.

[0002]

2. Description of the Related Art Conventionally, in the field of industrial machinery, a traction drive fluid has been used in a traction drive type power transmission device that transmits power via an oil film.
This traction drive fluid is required to have a high traction coefficient indicating power transmission capacity. Research and development of traction drive fluids for use in continuously variable transmissions for automobiles is underway, and when used for automobiles, the friction of not only power transmission mechanisms but also hydraulic control mechanisms and wet clutches It will also be used for the characteristic control mechanism. By the way, an automatic transmission oil (hereinafter, referred to as "ATF") is a lubricating oil used for a hydraulic control mechanism and a friction characteristic control mechanism of a wet clutch as a transmission for an automobile. It is a well-known fact that ATF is required to have a certain high kinematic viscosity at high temperatures and excellent low-temperature fluidity in order to fulfill its role as a hydraulic control mechanism. . In addition, in order to fulfill the role of a friction characteristic control mechanism of a wet clutch, particularly a control mechanism with a slip control mechanism added, the ATF is compounded with an additive having excellent friction characteristics, especially excellent anti-shudder characteristics. Is also a well-known fact. Therefore,
When a traction drive fluid is used in a traction drive type continuously variable transmission for automobiles, the traction drive fluid has not only the power transmission capability that originally has excellent performance, but also the hydraulic control required for the ATF. Therefore, the capacity as a fluid for use and the capacity as a fluid for controlling friction characteristics of a wet clutch are required.

[0003]

However, a commercially available traction drive fluid is "Santo Truck", which is widely known to have excellent power transmission capability. When used in transmissions, it is necessary to satisfy fluidity at low temperatures and other performances. Therefore, at present, traction drive fluids for automobiles have not yet been commercialized. Therefore, the present invention has been made in view of such circumstances, and its purpose is not only excellent power transmission capability, but also excellent fluidity at low temperatures, that is, excellent capability as a hydraulic control fluid, It is still another object of the present invention to provide a traction drive fluid having excellent performance as a wet clutch control fluid.

[0004]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, a traction drive fluid preferably used particularly for a traction drive type continuously variable transmission for automobiles, Specifically, the present inventors have developed a traction drive fluid that is applicable not only to a traction drive fluid for a power transmission mechanism but also to a hydraulic control mechanism and a friction characteristic control mechanism of a wet clutch. That is, the traction drive fluid of the present invention comprises a naphthene ring-containing compound represented by the following formula (1).

Embedded image (Wherein, R ¹ represents an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), and R ^{2 to} R ⁸ each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms ( Which may contain a naphthene ring).)

The traction drive fluid of the present invention is selected from the group consisting of (A) mineral oil and synthetic oil having a molecular weight of 150 to 800, in addition to the compound represented by the above formula (1). It is preferred that the composition contains at least one of the above. Further, it is preferable to blend (B) a viscosity index improver into these traction drive fluids. The (B) viscosity index improver is preferably an ethylene-α-olefin copolymer having a number average molecular weight of more than 800 and not more than 150,000 or a hydride thereof. In addition, these traction drive fluids include:
It preferably contains (C) an ashless dispersant and (D) a phosphorus-based additive. In addition, these traction drive fluids include (E) a friction material having at least one alkyl group or alkenyl group having 6 to 30 carbon atoms in the molecule and having no hydrocarbon group having 31 or more carbon atoms in the molecule. It is preferable to contain a regulator. Further, these traction drive fluids have (F) a total base number of 20 to 450 m.
It preferably contains gKOH / g of a metallic detergent.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the contents of the present invention will be described in more detail. The traction drive fluid of the present invention is:
It is a naphthene ring-containing compound represented by the following formula (1).

Embedded image (1) In the formula, R ¹ represents an alkyl group having 1 to 8 carbon atoms (which may have a naphthene ring), preferably an alkyl group having 1 to 4 carbon atoms, more preferably methyl group, R ² ~
R ⁸ is each independently a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, more preferably a hydrogen atom or a methyl group. Is shown. As the alkyl group having 1 to 8 carbon atoms which may contain a naphthene ring, specifically, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group (The alkyl groups may be linear or branched), cyclopentylmethyl group, cyclopentylethyl group, cyclopentylpropyl group, methylcyclopentylmethyl group, ethylcyclopentylmethyl group, dimethylcyclopentylmethyl group, methylcyclopentylethyl Group, cyclohexylmethyl group,
(Alkyl) cyclohexylalkyl groups such as a cyclohexylethyl group, a methylcyclohexylmethyl group, and a cycloheptylmethyl group (the alkyl groups may be linear or branched, and the position of substitution with the cyclohexyl group is arbitrary). Can be illustrated. More specifically, the compound represented by the general formula (1) of the present invention is a compound having a structure represented by the following formula (2) or (3).

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Embedded image In the above formula (2) and (3), the group represented by R ¹ to R ⁸ is a group the same groups respectively represented by R ¹ to R ⁸ in the formula (1), i.e. R ¹ is And an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably an alkyl group having 1 to 4 carbon atoms, and more preferably a methyl group, and R ^{2 to} R ⁸ each independently represent a hydrogen atom Or an alkyl group having 1 to 8 carbon atoms (which may contain a naphthene ring), preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, more preferably a hydrogen atom or a methyl group. In addition, among these compounds, compounds represented by the following formulas (4) and (5) are preferable in terms of particularly excellent traction coefficient.

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Embedded image Here, in the above formula (4) and (5), the group represented by R ¹ to R ⁸ is a group the same groups respectively represented by R ¹ to R ⁸ in the formula (1), namely R ¹ is an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably an alkyl group having 1 to 4 carbon atoms, and more preferably a methyl group, and R ^{2 to} R ⁸ are each independently A hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, more preferably a hydrogen atom or a methyl group. In the compound represented by the formula (4), R ¹ is an alkyl group having 1 to 4 carbon atoms, more preferably a methyl group, R ⁴ , R ⁷ and R ⁸ are hydrogen atoms, and R ² , R ³ , R ⁵
And R ⁶ are all hydrogen atoms, or at least one of R ² , R ³ , R ⁵ and R ⁶ is an alkyl group having 1 to 4 carbon atoms,
Compounds which are more preferably a methyl group and others are hydrogen atoms are particularly preferred. On the other hand, in the compound represented by the formula (5), R ¹ is an alkyl group having 1 to 4 carbon atoms, more preferably a methyl group, and R ⁴ , R ⁶ , R ⁷ and R ⁸ are hydrogen atoms. R ² , R ³ and R ⁵ are all hydrogen atoms, or at least one of R ² , R ³ and R ⁵ is an alkyl group having 1 to 4 carbon atoms, more preferably a methyl group, and the others are Compounds that are hydrogen atoms are particularly preferred. The method for synthesizing the compound represented by the general formula (1) of the present invention is not particularly limited, and conventionally known various methods can be applied. For example, the compound is synthesized by the following condensation reaction or addition reaction. be able to. Condensation reaction or addition reaction A cyclohexanol compound represented by the formula (a-1) or a cyclohexene compound represented by the formula (a-2) and a compound represented by the formula (b) are converted into sulfuric acid, methanesulfonic acid, The reaction is performed at a temperature of 0 to 10 ° C. in the presence of an acidic catalyst such as clay or a non-aqueous ion exchange resin (Amberlite).
The obtained condensation or addition reaction product is subjected to a hydrogen pressure of 30 to 70 MPa in the presence of a metal-based hydrogenation catalyst such as nickel and platinum.
a) The compound represented by the formula (1) can be obtained by performing nuclear hydrogenation of an aromatic ring under conditions of a temperature of 120 to 170 ° C. In addition, in the alkylcyclohexene compound represented by the formula (a-2), when R ^{2 to} R ⁴ are all hydrogen atoms, the bonding position of R ¹ is not particularly limited, and the bonding position of R ¹ may be any position on the cyclohexane ring. A cyclohexanol compound to which R ¹ is bonded can be used as a raw material.

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In the traction drive fluid of the present invention, the naphthene ring-containing compound represented by the above formula (1) may be used as it is, but for the purpose of improving its low-temperature fluidity and viscosity-temperature characteristics. Further, it is preferable that at least one selected from the group consisting of (A) a mineral oil and a synthetic oil having a molecular weight of 150 to 800, preferably 150 to 500 is contained. In the present invention, as mineral oil,
Specifically, for example, a lubricating oil fraction obtained by atmospheric distillation and vacuum distillation of crude oil is subjected to solvent dewatering, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid washing. ,
A paraffinic or naphthenic oil or normal paraffin refined by appropriately combining purification treatments such as clay treatment can be used. The kinematic viscosity of the mineral oil in the case of using the mineral oil is not particularly limited and is arbitrary. However, the kinematic viscosity at 100 ° C. is usually 1 to 10 mm ² / s, preferably 2 to 8 mm ² / s.
It is desirable to use one having a mm ² / s. In the present invention, the synthetic oil needs to have a molecular weight of 150 to 800, preferably 150 to 500. If the molecular weight is less than 150, the evaporation loss increases, while if it exceeds 800, the low-temperature fluidity deteriorates, which is not preferable. The synthetic oil is not particularly limited, but may be poly-α-olefin (1-octene oligomer,
1-decene oligomers, ethylene-propylene oligomers and the like, hydrides thereof, isobutene oligomers and hydrides thereof, isoparaffins, alkylbenzenes, alkylnaphthalenes, diesters (ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridecyl adipate), Di-2-ethylhexyl sebacate, etc.), polyol esters (trimethylolpropane caprylate, trimethylolpropane pelargonate, pentaerythritol 2-ethylhexanoate, pentaerythritol pelargonate, etc.),
Polyoxyalkylene glycol, dialkyl diphenyl ether, polyphenyl ether and the like can be used. Further, among synthetic oils, isobutene oligomers or hydrides thereof, or the following general formulas (6) to (6):
The synthetic oil represented by (17) has a high traction coefficient by being blended with the aforementioned naphthene ring-containing compound,
In addition, it is a particularly preferred synthetic oil because it has excellent low-temperature fluidity, high high-temperature viscosity, and a traction drive fluid having excellent overall performance.

Embedded image In the formula (6), R ^{9 to} R ¹⁶ each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. Group, more preferably a hydrogen atom or a methyl group.

Embedded image In the formula (7), R ^{17 to} R ²⁶ each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. Group, more preferably a hydrogen atom or a methyl group.

Embedded image In the formula (8), R ^{27 to} R ³⁸ each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. Group, more preferably a hydrogen atom or a methyl group.

Embedded image In the formula (9), R ^{39 to} R ⁴⁴ each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. Group, more preferably a hydrogen atom or a methyl group.

Embedded image In the above formula (10), R ^{45 to} R ⁵⁰ each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. Group, more preferably a hydrogen atom or a methyl group.

Embedded image In the formula (11), R ^{51 to} R ⁵⁶ each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. Group, more preferably a hydrogen atom or a methyl group.

Embedded image In the above formula (12), R ⁵⁷ and R ⁵⁸ both represent a hydrogen atom or a group in which either one is a hydrogen atom and the other is a methyl group, and R ⁵⁹ and R ⁶⁰ each independently represent a hydrogen atom or a carbon atom. An alkyl group of 1 to 8 (which may contain a naphthene ring), preferably a hydrogen atom or an alkyl group of 1 to 4 carbon atoms, more preferably a hydrogen atom or methyl group.

Embedded image In the above formula (13), R ⁶¹ and R ⁶² both represent a hydrogen atom or a group in which either one is a hydrogen atom and the other is a methyl group, and R ⁶³ and R ⁶⁴ each independently represent a hydrogen atom or a carbon atom. An alkyl group of 1 to 8 (which may contain a naphthene ring), preferably a hydrogen atom or an alkyl group of 1 to 4 carbon atoms, more preferably a hydrogen atom or methyl group.

Embedded image In the formula (14), R ^{65 to} R ⁶⁷ each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. Group, more preferably a hydrogen atom or a methyl group.

Embedded image In the formula (15), R ^{68 to} R ⁷⁰ each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. Group, more preferably a hydrogen atom or a methyl group.

Embedded image In the above formula (16), R ⁷¹ is an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably 1 to 8 carbon atoms.
4 represents an alkyl group, more preferably a methyl group. R ^{72 to} R ⁷⁷ each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring);
It preferably represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, more preferably a hydrogen atom or a methyl group.

Embedded image In the formula (17), R ⁷⁸ represents an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably 1 to 8 carbon atoms.
4 represents an alkyl group, more preferably a methyl group. R ^{79 to} R ⁸⁵ each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring);
It preferably represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, more preferably a hydrogen atom or a methyl group. In synthetic oils represented by the general formula (6) ~ (17), R 9 ~
Examples of the alkyl group having 1 to 8 carbon atoms which may contain a naphthene ring in R ⁵⁶ , R ⁵⁹ , R ⁶⁰ , and R ^{63 to} R ⁸⁵ include a methyl group, an ethyl group, a propyl group, a butyl group, Alkyl groups such as pentyl group, hexyl group, heptyl group, and octyl group (the alkyl groups may be linear or branched), cyclopentylmethyl group, cyclopentylethyl group, cyclopentylpropyl group, methylcyclopentylmethyl group, ethylcyclopentyl (Alkyl) cyclohexylalkyl groups such as methyl group, dimethylcyclopentylmethyl group, methylcyclopentylethyl group, cyclohexylmethyl group, cyclohexylethyl group, methylcyclohexylmethyl group, and cycloheptylmethyl group (the alkyl groups may be linear or branched Or a cyclohexyl group The position of substitution with is also arbitrary). When the component (A) is contained in the traction drive fluid of the present invention, the content thereof is not particularly limited and is optional. However, in view of the excellent low-temperature fluidity and the effect of improving the viscosity-temperature characteristics, the total amount of the fluid is usually large. 1 to 99 by standard
% By mass, and more preferably from 5 to 95% by mass. Further, the mixing ratio of the component (A) to the naphthene ring-containing compound represented by the general formula (1) is not particularly limited, but is usually a weight ratio from the viewpoint of excellent low-temperature fluidity and the effect of improving viscosity-temperature characteristics. And 1: 99-9
The ratio is preferably 9: 1, more preferably from 5:95 to 95: 5.

Further, the traction drive fluid of the present invention preferably contains (B) a viscosity index improver.
In the present invention, examples of the (B) viscosity index improver include a non-dispersion type viscosity index improver and / or a dispersion type viscosity index improver. As the non-dispersion type viscosity index improver, specifically, one or two or more types of monomers selected from the compounds represented by the following formulas (18), (19) and (20) (B- The copolymer of 1) or a hydride thereof can be exemplified. On the other hand, as the dispersion-type viscosity index improver, specifically, a copolymer of two or more types of monomers selected from the compounds represented by the general formulas (21) and (22) or a hydride of the copolymer is used. And those having a group containing a compound of the general formula (1
8) One or more monomers (B-1) selected from the compounds represented by (20) and 1 selected from the compounds represented by the general formulas (21) and (22) Examples thereof include a copolymer with a kind or two or more kinds of monomers (B-2) or a hydride thereof.

Embedded image In the formula (18), R ⁸⁶ represents hydrogen or a methyl group;
⁸⁷ represents an alkyl group having 1 to 18 carbon atoms. Examples of the alkyl group having 1 to 18 carbon atoms for R ⁸⁷ 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, Decyl group, undecyl group, dodecyl group,
Examples thereof include a tridecyl group, a tetradecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, an octadecyl group and the like (the alkyl groups may be linear or branched).

Embedded image In the above formula (19), R ⁸⁸ represents hydrogen or a methyl group;
⁸⁹ indicates a hydrocarbon group having 1 to 12 carbon atoms. Examples of the hydrocarbon group having 1 to 12 carbon atoms which indicates the R ^89, specifically, 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 , Undecyl, dodecyl and other alkyl groups (these alkyl groups may be linear or branched);
Alkenyl groups such as butenyl group, pentenyl group, hexenyl group, heptenyl group, octenyl group, nonenyl group, decenyl group, undecenyl group and dodecenyl group (these alkenyl groups may be straight-chain or branched; Is also optional); cyclopentyl group, cyclohexyl group,
A cycloalkyl group having 5 to 7 carbon atoms such as a cycloheptyl group; methylcyclopentyl group, dimethylcyclopentyl group, methylethylcyclopentyl group, diethylcyclopentyl group, methylcyclohexyl group, dimethylcyclohexyl group, methylethylcyclohexyl group, diethylcyclohexyl group, methyl An alkylcycloalkyl group having 6 to 11 carbon atoms such as a cycloheptyl group, a dimethylcycloheptyl group, a methylethylcycloheptyl group, and a diethylcycloheptyl group (the substitution position of these alkyl groups with a cycloalkyl group is arbitrary); phenyl Groups, aryl groups such as naphthyl groups: C7 to C12 such as tolyl, xylyl, ethylphenyl, propylphenyl, butylphenyl, pentylphenyl, hexylphenyl and the like.
(The alkyl groups may be linear or branched, and the position of substitution with the aryl group is arbitrary); benzyl, phenylethyl, phenylpropyl, phenylbutyl, phenylpentyl And phenylalkyl groups having 7 to 12 carbon atoms such as a phenylhexyl group (these alkyl groups may be linear or branched); and the like.

Embedded image In the above formula (20), D ¹ and D ² are each independently a hydrogen atom, a residue of an alkyl alcohol having 1 to 18 carbon atoms (—OR ⁹⁰ : R ⁹⁰ is an alkyl group having 1 to 18 carbon atoms) or The residue of a monoalkylamine having 1 to 18 carbon atoms (-NHR
⁹¹ : R ⁹¹ represents an alkyl group having 1 to 18 carbon atoms).

Embedded image (21) In the formula, R ⁹² represents a hydrogen atom or a methyl group;
⁹³ represents an alkylene group having 1 to 18 carbon atoms, and E ¹ represents an amine residue or a heterocyclic residue containing 1 to 2 nitrogen atoms and 0 to 2 oxygen atoms. A is 0 or 1
Is an integer. Specific examples of the alkylene group having 1 to 18 carbon atoms for R ⁹³ include an ethylene group, a propylene group,
Butylene group, pentylene group, hexylene group, heptylene group, octylene group, nonylene group, decylene group, undecylene group, dodecylene group, tridecylene group, tetradecylene group, pentadecylene group, hexadecylene group, heptadecylene group, octadecylene group, etc. May be linear or branched). Also, E
^{As the} group representing ¹ , specifically, a dimethylamino group,
Diethylamino group, dipropylamino group, dibutylamino group, anilino group, toluidino group, xylidino group, acetylamino group, benzoylamino group, morpholino group, pyrrolyl group, pyrrolino group, pyridyl group, methylpyridyl group, pyrrolidinyl group, piperidinyl group Quinonyl group, pyrrolidonyl group, pyrrolidono group, imidazolino group, pyrazino group and the like.

Embedded image In the above formula (22), R ⁹⁴ represents a hydrogen atom or a methyl group, and E ² represents an amine residue or a heterocyclic residue containing 1 to 2 nitrogen atoms and 0 to 2 oxygen atoms. . Specific examples of the group representing E ² include a dimethylamino group, a diethylamino group, a dipropylamino group, a dibutylamino group, an anilino group, a toluidino group, a xylidino group, an acetylamino group, a benzoylamino group, a morpholino group, and a pyrrolyl group. Group, pyrrolino group, pyridyl group, methylpyridyl group,
Examples thereof include a pyrrolidinyl group, a piperidinyl group, a quinonyl group, a pyrrolidonyl group, a pyrrolidono group, an imidazolino group, and a pyrazino group. Specific examples of preferred monomers as the component (B-1) include alkyl acrylates having 1 to 18 carbon atoms, alkyl methacrylates having 1 to 18 carbon atoms, olefins having 2 to 20 carbon atoms, styrene, methyl styrene, Examples thereof include maleic anhydride esters, maleic anhydride amides, and mixtures thereof. (B-2)
Preferred as the monomer of the component are, specifically, dimethylaminomethyl methacrylate, diethylaminomethyl methacrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, 2
Examples thereof include -methyl-5-vinylpyridine, morpholinomethyl methacrylate, morpholinoethyl methacrylate, N-vinylpyrrolidone, and mixtures thereof. One or two selected from the above compounds (B-1)
(B-2) when copolymerizing at least one kind of monomer with one or more kinds of monomers selected from the compounds (B-2)
The molar ratio of component -1) to component (B-2) is arbitrary,
Generally, it is about 80:20 to 95: 5. The reaction method of the copolymerization is also optional, but usually, the component (B-1) and the component (B-
2) A copolymer can be easily obtained by subjecting the components to radical solution polymerization. As specific examples of the viscosity index improver,
Non-dispersed and dispersed polymethacrylates, non-dispersed and dispersed ethylene-α-olefin copolymers and hydrides thereof, polyisobutylene and hydrides thereof, styrene-diene hydrogenated copolymers, styrene-maleic anhydride Examples include ester copolymers and polyalkylstyrenes. By containing one or two or more arbitrarily selected from the viscosity index improvers of the component (B), the high temperature viscosity particularly required for traction drive fluids for automobiles is increased, and It is possible to improve the balance with low-temperature fluidity. In general, the viscosity index improver is used together with a solvent used in the synthesis thereof. ) To (22) are desirably used as solvents for synthesis. The molecular weight of the component (B) is preferably selected in consideration of shear stability. Specifically, the number average molecular weight of the component (B) is, for example, in the case of a dispersion type and a non-dispersion type polymethacrylate,
5,000 to 150,000, preferably 5,000 to
Preferably 35,000. In the case of polyisobutylene and its hydride, those having a molecular weight of 800 to 5,000, preferably 2,000 to 4,000 are desirable. Polyisobutylene and its hydride have a number average molecular weight of 800
If it is less than 3, the thickening is low and the traction coefficient decreases, and if it exceeds 5,000, the shear stability deteriorates and the low-temperature fluidity deteriorates. Among these components (B), particularly, the number average molecular weight is 800 or more, 150,0 or more.
The ethylene-α-olefin copolymer having a traction coefficient of 00 or less, preferably 3,000 to 20,000, has a high traction coefficient and is excellent in low-temperature fluidity by being blended with a traction drive fluid. It is a particularly preferred viscosity index improver in that a traction drive fluid having high overall temperature and high viscosity is obtained. The number average molecular weight of the ethylene-α-olefin copolymer or its hydride is 8
If it is less than 00, the viscosity is low and the traction coefficient is low. If it exceeds 150,000, the shear stability is deteriorated. The ethylene component content in the ethylene-α-olefin copolymer or its hydride is not particularly limited, but is preferably 30 to 80 mol%, more preferably 5 to 80 mol%.
0 to 80 mol%. Examples of the α-olefin include propylene and 1-butene, and propylene is more preferable. When the component (B) is contained in the traction drive fluid of the present invention, its content is not particularly limited, but it is usually preferably 0.1 to 20% by mass, based on the total amount of the traction drive fluid. 1 to
More preferably, it is 10% by mass. When the content exceeds 20% by mass, the traction coefficient of the fluid decreases, while
If the content is less than 0.1% by mass, the effect of addition is poor.

The traction drive fluid of the present invention preferably contains (C) an ashless dispersant and (D) a phosphorus-based additive. These (C) ashless dispersants and (D)
By blending the phosphorus-based additive, it is possible to add abrasion resistance, oxidation stability and cleanliness required for the hydraulic control mechanism to the traction drive fluid. In the present invention, the ashless dispersant (component (C)) includes, for example,
A nitrogen-containing compound having at least one alkyl group or alkenyl group of at least one in its molecule or a derivative thereof, or a modified product of alkenyl succinimide, and one or more arbitrarily selected from these. Can be blended. This alkyl group or alkenyl group may be linear or branched, but is preferably, for example, propylene, 1-butene,
Examples include a branched alkyl group or a branched alkenyl group derived from an oligomer of an olefin such as isobutylene or a co-oligomer of ethylene and propylene. The alkyl or alkenyl group has 40 to 400, preferably 60 to 350, carbon atoms. When the number of carbon atoms of the alkyl group or alkenyl group is less than 40, the solubility of the compound in the lubricating base oil is reduced. On the other hand, when the number of carbon atoms of the alkyl group or alkenyl group exceeds 400, the low temperature of the traction drive fluid is low. Since the fluidity deteriorates, each is not preferable. Although the nitrogen content of the nitrogen-containing compound mentioned as an example of the component (C) is arbitrary, the nitrogen content is usually 0.01 in terms of abrasion resistance, oxidation stability, friction characteristics and the like.
It is desirably used in an amount of from 10 to 10% by mass, preferably from 0.1 to 10% by mass. Specific examples of the component (C) include, for example, (C-1) succinimide having at least one alkyl group or alkenyl group having 40 to 400 carbon atoms in a molecule, or a derivative thereof. Benzylamine having at least one alkyl group or alkenyl group of 40 to 400 in the molecule, or a derivative thereof (C-3) polyamine having at least one alkyl group or alkenyl group of 40 to 400 carbon atoms in the molecule, or One or more compounds selected from the derivatives are listed. More specifically, examples of the above-mentioned (C-1) succinimide include compounds represented by the following formula (23) or (24).

Embedded image In the formula (23), R ⁹⁵ represents an alkyl group or an alkenyl group having 40 to 400 carbon atoms, preferably 60 to 350 carbon atoms, and b represents an integer of 1 to 5, preferably 2 to 4.

Embedded image In the above formula (24), R ⁹⁶ and R ⁹⁷ are each independently:
It represents an alkyl or alkenyl group having 40 to 400, preferably 60 to 350 carbon atoms, and c represents an integer of 0 to 4, preferably 1 to 3. In the imidization, succinimide is a monoamine type succinimide in which succinic anhydride is added to one end of a polyamine, and succinic anhydride is added to both ends of a polyamine. There is a so-called bis-type succinimide represented by the formula (24), but as the component (C-1),
Either one or a mixture thereof can be used. More specifically, examples of the above-mentioned (C-2) benzylamine include a compound represented by the following formula (25).

Embedded image In the formula (25), R ⁹⁸ represents an alkyl group or alkenyl group having 40 to 400, preferably 60 to 350, carbon atoms, and d represents an integer of 1 to 5, preferably 2 to 4. The method for producing this benzylamine is not particularly limited. And a polyamine such as triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, etc., by a Mannich reaction. More specifically, examples of the polyamine (C-3) include compounds represented by the following formula (26).

Embedded image In the above formula (26), R ⁹⁹ represents an alkyl group or an alkenyl group having 40 to 400, preferably 60 to 350 carbon atoms, and e represents an integer of 1 to 5, preferably 2 to 4. Although the production method of this polyamine is not limited at all, for example, after chlorinating a polyolefin such as propylene oligomer, polybutene, and ethylene-α-olefin copolymer, ammonia, ethylenediamine,
It can be obtained by reacting a polyamine such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine and pentaethylenehexamine.
In addition, specific examples of the derivative of the nitrogen-containing compound mentioned as an example of the component (C) include, for example, the above-described nitrogen-containing compound and a monocarboxylic acid having 2 to 30 carbon atoms (such as a fatty acid) or oxalic acid By reacting a polycarboxylic acid having 2 to 30 carbon atoms such as phthalic acid, trimellitic acid, and pyromellitic acid, a part or all of the remaining amino group and / or imino group is neutralized or amidated. A so-called boron-modified compound in which boric acid acts on the nitrogen-containing compound as described above to neutralize or amidate a part or all of the remaining amino group and / or imino group; A sulfur-modified compound obtained by allowing a sulfur compound to act on a nitrogen-containing compound as described above; and two or more types of modifications selected from acid modification, boron modification, and sulfur modification are combined with the nitrogen-containing compound described above. Sexual compounds; and the like.
When the component (C) is contained in the traction drive fluid of the present invention, the content thereof is not particularly limited, but usually, based on the total amount of the traction drive fluid,
It is preferably 0.01 to 10.0% by mass, and 0.1% by mass.
More preferably, it is -7.0% by mass. When the content of the component (C) is less than 0.01% by mass, there is no effect on cleanliness. On the other hand, if it exceeds 10.0% by mass, the low-temperature fluidity of the traction drive fluid is significantly deteriorated, which is not preferable.

In the present invention, (D) the phosphorus-based additive includes zinc alkyldithiophosphate, phosphoric acid, phosphorous acid, phosphoric acid monoesters, phosphoric diesters, phosphoric acid triesters, and phosphorous acid monoester. , Phosphite diesters, phosphite triesters, salts of (phosphite) phosphites, and mixtures thereof. Of the components (D) listed above, those excluding phosphoric acid and phosphorous acid are compounds containing a hydrocarbon group having usually 2 to 30, preferably 3 to 20 carbon atoms. This carbon number 2-30
As the hydrocarbon group, specifically, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group,
Alkyl groups such as dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group and octadecyl group (the alkyl groups may be linear or branched); butenyl group, pentenyl group, hexenyl group, heptenyl Alkenyl groups such as octenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl and the like (these alkenyl groups may be linear or branched; And the position of the double bond is also arbitrary); cycloalkyl group having 5 to 7 carbon atoms such as cyclopentyl group, cyclohexyl group, cycloheptyl group; methylcyclopentyl group, dimethylcyclopentyl group, methylethylcyclopentyl group, diethyl An alkylcyclo having 6 to 11 carbon atoms such as a clopentyl group, a methylcyclohexyl group, a dimethylcyclohexyl group, a methylethylcyclohexyl group, a diethylcyclohexyl group, a methylcycloheptyl group, a dimethylcycloheptyl group, a methylethylcycloheptyl group, and a diethylcycloheptyl group. Alkyl group (the position of substitution of the alkyl group with the cycloalkyl group is also arbitrary); aryl group such as phenyl group and naphthyl group: tolyl group, xylyl group, ethylphenyl group, propylphenyl group, butylphenyl group, pentylphenyl group , A hexylphenyl group, a heptylphenyl group, an octylphenyl group, a nonylphenyl group, a decylphenyl group, an undecylphenyl group, a dodecylphenyl group and the like. It may be branched and the position of substitution on the aryl group is arbitrary.); Aryl having 7 to 12 carbon atoms such as benzyl group, phenylethyl group, phenylpropyl group, phenylbutyl group, phenylpentyl group and phenylhexyl group. Alkyl groups (these alkyl groups may be linear or branched); and the like. Specific examples of preferred compounds as the component (D) include phosphoric acid; phosphorous acid; zinc dipropyldithiophosphate, zinc dibutyldithiophosphate, zinc dipentyldithiophosphate, zinc dihexyldithiophosphate, zinc diheptyldithiophosphate, and dioctyl. Zinc alkyldithiophosphate such as zinc dithiophosphate (the alkyl group may be linear or branched); such as monopropyl phosphate, monobutyl phosphate, monopentyl phosphate, monohexyl phosphate, monoheptyl phosphate, monooctyl phosphate, etc. Monoalkyl phosphates (the alkyl group may be linear or branched); mono (alkyl) aryl phosphates such as monophenyl phosphate and monocresyl phosphate; dipropyl phosphate, dibutyl phosphate Dipentyl phosphate,
Dialkyl phosphates such as dihexyl phosphate, dipeptyl phosphate and dioctyl phosphate (the alkyl group may be linear or branched); di (alkyl) aryl phosphates such as diphenyl phosphate and dicresyl phosphate; tripropyl Trialkyl phosphates such as phosphate, tributyl phosphate, tripentyl phosphate, trihexyl phosphate, tripeptyl phosphate, trioctyl phosphate (the alkyl group may be linear or branched); triphenyl phosphate, tricresyl Tri (alkyl) aryl phosphate esters such as phosphates;
Monopropyl phosphite, monobutyl phosphite,
Monoalkyl phosphites such as monopentyl phosphite, monohexyl phosphite, monopeptyl phosphite, and monooctyl phosphite (the alkyl group may be linear or branched); monophenyl phosphite, monocrete Phosphorous mono (alkyl) aryl esters such as zyl phosphite; diphosphite dialkyl esters (alkyl such as dipropyl phosphite, dibutyl phosphite, dipentyl phosphite, dihexyl phosphite, dipeptyl phosphite, dioctyl phosphite) The group may be linear or branched); di (alkyl) aryl phosphites such as diphenyl phosphite and dicresyl phosphite; tripropyl phosphite, tributyl phosphite, tripentyl phosphite, trihexyl phosphite Trialkyl phosphites such as aite, tripeptyl phosphite and trioctyl phosphite (the alkyl group may be linear or branched); phosphorous acid such as triphenyl phosphite and tricresyl phosphite Tri (alkyl) aryl esters; and mixtures thereof. Further, as the salts of the above-mentioned (sub) phosphoric acid esters, specifically,
Phosphoric acid monoesters, phosphoric acid diesters, phosphorous acid monoesters, phosphorous acid diesters, and the like, such as ammonia and amine compounds containing only a hydrocarbon group having 1 to 8 carbon atoms or a hydroxyl group-containing hydrocarbon group in the molecule. Salts obtained by reacting a nitrogen-containing compound to neutralize part or all of the remaining acidic hydrogen can be exemplified. Specific examples of the nitrogen-containing compound include ammonia; monomethylamine, monoethylamine, monopropylamine, monobutylamine, monopentylamine, monohexylamine, monoheptylamine, monooctylamine, dimethylamine, methylethylamine, and diethylamine. , Methylpropylamine, ethylpropylamine, dipropylamine, methylbutylamine, ethylbutylamine, propylbutylamine,
Alkylamines such as dibutylamine, dipentylamine, dihexylamine, diheptylamine and dioctylamine (the alkyl group may be linear or branched); monomethanolamine, monoethanolamine, monopropanolamine, monobutanolamine, Monopentanolamine, monohexanolamine, monoheptanolamine, monooctanolamine, monononanolamine, dimethanolamine, methanolethanolamine, diethanolamine, methanolpropanolamine, ethanolpropanolamine, dipropanolamine, methanolbutanolamine, ethanolbutanol Amine, propanol butanolamine, dibutanolamine, dipentanolamine, dihexanolamine, diheptano Amines, alkanolamines di octanol amine (alkanol group may be and straight-chain or branched); and mixtures thereof and the like can be exemplified.
One or more of these components (D) can be arbitrarily compounded. In addition, as a component (D), at least one (E-2) alkyl or alkenyl group having 6 to 30 carbon atoms described later in the molecule, and having 31 carbon atoms
When using a compound contained in the phosphorus compound or derivative thereof that does not contain the hydrocarbon group in the molecule, the traction drive fluid of the present invention, in addition to the above-described wear resistance, furthermore Optimized friction characteristics in a wet clutch can be provided at the same time. When the component (D) is contained in the traction drive fluid of the present invention, the content thereof is not particularly limited, but is usually 0.005 to 0.2% by mass as a phosphorus element based on the total amount of the traction drive fluid. Is preferred. When the content of phosphorus is less than 0.005% by mass, there is no effect on wear resistance, and when the content is more than 0.2% by mass, oxidation stability is deteriorated, which is not preferable.

The traction drive fluid of the present invention preferably contains (E) a friction modifier. This friction modifier has at least one alkyl group or alkenyl group having 6 to 30 carbon atoms in the molecule, and has 31 carbon atoms.
Since the above hydrocarbon group is not contained in the molecule, a fluid for traction drive in which friction characteristics are optimized can be obtained by blending the friction modifier (E). (E) The alkyl or alkenyl group of the friction modifier may be linear or branched, but is preferably a compound having 6 to 30, preferably 9 to 24 carbon atoms. When the number of carbon atoms of the alkyl group or the alkenyl group is less than 6 or more than 30, the friction characteristics of the wet clutch deteriorate, which is not preferable. As the alkyl group or alkenyl group, specifically, 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,
Icosyl group, henicosyl group, docosyl group, tricosyl group, tetracosyl group, pentacosyl group, hexacosyl group, heptacosyl group, octacosyl group, nonacosyl group,
Alkyl groups such as triacontyl groups (these alkyl groups may be linear or branched); hexenyl group, heptenyl group, octenyl group, nonenyl group, decenyl group, undecenyl group, dodecenyl group, tridecenyl group, tetradecenyl group, pentadecenyl group Group, hexadecenyl group, heptadecenyl group, octadecenyl group, nonadecenyl group, icosenyl group, henicosenyl group, docosenyl group, tricosenyl group, tetracosenyl group, pentacosenyl group, hexacosenyl group, heptacocenyl group, octacocenyl group, nonacocenyl group, triaconenyl group, etc. Alkenyl groups (these alkenyl groups may be linear or branched, and the position of the double bond is arbitrary); and the like. Further, it is not preferable to contain a hydrocarbon group having 31 or more carbon atoms as a friction modifier because the friction characteristics of the wet clutch deteriorate.

Specific examples of the component (E) include: (E-1) a hydrocarbon having at least one alkyl or alkenyl group having 6 to 30 carbon atoms in the molecule and having 31 or more carbon atoms. Compound having no group in the molecule or derivative thereof (E-2) A molecule having at least one alkyl group or alkenyl group having 6 to 30 carbon atoms in the molecule and having 31 or more carbon atoms in the molecule. Phosphorus compound not contained therein or derivative thereof (E-3) At least one alkyl group or alkenyl group having 6 to 30 carbon atoms in the molecule, and a hydrocarbon group having 31 or more carbon atoms in the molecule Preferred compounds include one or more compounds selected from amides or metal salts of fatty acids that are not used. Here (E-
As the amine compound 1), more specifically, an aliphatic monoamine represented by the following formula (27) or an alkylene oxide adduct thereof, an aliphatic polyamine represented by the following formula (28), a general formula Examples thereof include the imidazoline compound represented by (29).

Embedded image In the formula (27), R ¹⁰⁰ represents an alkyl group or an alkenyl group having 6 to 30 carbon atoms, preferably 9 to 24 carbon atoms;
¹⁰¹ and R ¹⁰² each independently represent an ethylene group or a propylene group; R ¹⁰³ and R ¹⁰⁴ each independently represent a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms; 0 to 10 and f + g = 0 to 1
0, preferably each independently 0-6, and f
+ G = 0 to 10 represents an integer.

Embedded image In the formula (28), R ¹⁰⁵ represents an alkyl or alkenyl group having 6 to 30 carbon atoms, preferably 9 to 24 carbon atoms;
¹⁰⁶ represents an ethylene group or a propylene group, and R ¹⁰⁷ and R
¹⁰⁸ independently represents a hydrogen atom or a carbon number of 1 to 30;
And h represents 1 to 5, preferably 1 to 4
Are shown as integers.

Embedded image In the formula (29), R ¹⁰⁹ represents an alkyl group or an alkenyl group having 6 to 30 carbon atoms, preferably 9 to 24 carbon atoms;
¹¹⁰ represents an ethylene group or a propylene group, and R ¹¹¹ is
A hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms, i.
Represents an integer of 0 to 10, preferably 0 to 6.
The alkyl group or alkenyl group represented by R ¹⁰⁰ , R ¹⁰⁵ and R ¹⁰⁹ may be linear or branched, but preferably has 6 to 30, preferably 9 to 24 carbon atoms.
When the number of carbon atoms of the alkyl group or the alkenyl group is less than 6 or more than 30, the friction characteristics of the wet clutch deteriorate, which is not preferable. R ¹⁰⁰ , R ¹⁰⁵ and R ¹⁰⁹
Specific examples of the alkyl group or alkenyl group showing include, for example, the various alkyl groups and alkenyl groups as described above, and from the viewpoint of superior frictional properties of a wet clutch, a lauryl group, a myristyl group, and palmityl. An alkyl or alkenyl group having 12 to 18 carbon atoms such as a group, stearyl group, isostearyl group, oleyl group and the like is particularly preferred. R ¹⁰³ , R ¹⁰⁴ , R ¹⁰⁷ , R ¹⁰⁸ and R
Specific examples of the group representing ¹¹¹ include a hydrogen atom; 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, an undecyl group and a dodecyl group. , Tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, icosyl,
Alkyl groups such as henicosyl group, docosyl group, tricosyl group, tetracosyl group, pentacosyl group, hexacosyl group, heptacosyl group, octacosyl group, nonacosyl group, triacontyl group and the like (these alkyl groups may be linear or branched); 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, icodecenyl group Alkenyl groups such as henicocenyl group, docosenyl group, tricosenyl group, tetracosenyl group, pentacosenyl group, hexacosenyl group, heptacosenyl group, octacosenyl group, nonacosenyl group, triacontenyl group, etc. The alkenyl group may be linear or branched, and the position of the double bond is also arbitrary.); A cycloalkyl group having 5 to 7 carbon atoms such as a cyclopentyl group, a cyclohexyl group and a cycloheptyl group; a methylcyclopentyl group; Dimethylcyclopentyl, methylethylcyclopentyl, diethylcyclopentyl, methylcyclohexyl, dimethylcyclohexyl, methylethylcyclohexyl, diethylcyclohexyl, methylcycloheptyl, dimethylcycloheptyl, methylethylcycloheptyl, diethylcycloheptyl An alkylcycloalkyl group having 6 to 11 carbon atoms (the substitution position of the alkyl group with the cycloalkyl group is also arbitrary);
Aryl groups such as phenyl group and naphthyl group: tolyl group, xylyl group, ethylphenyl group, propylphenyl group, butylphenyl group, pentylphenyl group, hexylphenyl group, heptylphenyl group, octylphenyl group, nonylphenyl group, decylphenyl An alkylaryl group having 7 to 18 carbon atoms such as a group, an undecylphenyl group or a dodecylphenyl group (the alkyl group may be linear or branched, and the position of substitution on the aryl group is arbitrary);
Benzyl group, phenylethyl group, phenylpropyl group,
Each arylalkyl group 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. In the aliphatic monoamine represented by the above formula (27) or the alkylene oxide adduct thereof, in the formula (27), R ¹⁰³ and R ¹⁰⁴ each independently represent a hydrogen atom from the viewpoint of superior frictional characteristics of a wet clutch. Or an aliphatic monoamine having an alkyl group having 1 to 6 carbon atoms and f = g = 0, or R ¹⁰³ and R ¹⁰⁴ are hydrogen atoms, and f and g are each independently 0 to 6 Further, an alkylene oxide adduct of an aliphatic monoamine, which is an integer satisfying f + g = 1 to 6, is more preferably used. Further, in the aliphatic polyamine represented by the above formula (28), in the formula (28), R ¹⁰⁷ and R ¹⁰⁸ each independently represent a hydrogen atom or a carbon Aliphatic polyamines, which are alkyl groups 6 to 6, are more preferably used. Also,
As the imidazoline compound represented by the above formula (29), R ¹¹¹ in the formula (29) is a hydrogen atom or a carbon atom having 1 to 6 carbon atoms because of its superior frictional characteristics of a wet clutch.
The imidazoline compound, which is an alkyl group, is more preferably used. On the other hand, as the derivative of the amine compound referred to in (E-1), specifically, for example, the above formulas (27) to (27)
A monocarboxylic acid having 2 to 30 carbon atoms (such as a fatty acid) or a polycarboxylic acid having 2 to 30 carbon atoms such as oxalic acid, phthalic acid, trimellitic acid, and pyromellitic acid act on an amine compound such as (29). Then, a part or all of the remaining amino group and / or imino group was neutralized or amidated,
A so-called acid-modified compound; a so-called boric acid-modified compound in which boric acid acts on an amine compound represented by formulas (27) to (29) to neutralize part or all of the remaining amino group and / or imino group. An amine compound represented by any one of formulas (27) to (29) having one to two hydrocarbon groups having 1 to 30 carbon atoms in its molecule, containing no hydrocarbon group having 31 or more carbon atoms, and A phosphoric acid ester salt obtained by reacting an acidic phosphoric acid ester or an acid phosphite having at least one hydroxyl group to neutralize a part or all of the remaining amino group and / or imino group; formula (28) Or a so-called alkylene oxide adduct of an amine compound obtained by reacting an amine compound such as (29) with an alkylene oxide such as ethylene oxide or propylene oxide; Modified products of amine compounds obtained by combining modified; and the like. As the amine compound (E-1) or a derivative thereof, specifically, laurylamine, lauryldiethylamine, lauryldiethanolamine,
Amine compounds such as dodecyldipropanolamine, palmitylamine, stearylamine, stearyltetraethylenepentamine, oleylamine, oleylpropylenediamine, oleyldiethanolamine, N-hydroxyethyloleylimidazoline; alkylene oxide adducts of these amine compounds; these amine compounds Salts of acid phosphates (eg, di-2-ethylhexyl phosphate) and acid phosphites (eg, di-2-ethylhexyl phosphite); these amine compounds, alkylene oxide adducts of amine compounds or amine compounds And the like are particularly preferably used.

As the phosphorus compound of the above (E-2), more specifically, for example, a phosphoric acid ester represented by the following formula (30) and a phosphite ester represented by the following formula (31) And the like.

Embedded image In the formula (30), R ¹¹² represents an alkyl group or an alkenyl group having 6 to 30 carbon atoms, preferably 9 to 24 carbon atoms;
¹¹³ and R ¹¹⁴ each independently represent a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms, and F ¹ , F ² , F ³ and F
⁴ is individually an oxygen atom or a sulfur atom,
Further, it represents a group in which at least one of F ¹ , F ² , F ³ and F ⁴ is an oxygen atom.

Embedded image In the formula (31), R ¹¹⁵ represents an alkyl group or an alkenyl group having 6 to 30 carbon atoms, preferably 9 to 24 carbon atoms;
¹¹⁶ and R ¹¹⁷ each independently represent a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms; F ⁵ , F ⁶ and F ⁷ each independently represent an oxygen atom or a sulfur atom;
^5, at least one of F ⁶ and F ⁷ shows the group is an oxygen atom. The alkyl group or alkenyl group represented by R ¹¹² and R ¹¹⁵ may be linear or branched, and preferably has 6 to 30, preferably 9 to 24 carbon atoms. When the number of carbon atoms of the alkyl group or the alkenyl group is less than 6 or more than 30, the friction characteristics of the wet clutch deteriorate, which is not preferable. Specific examples of the alkyl group or alkenyl group include, for example, various alkyl groups and alkenyl groups as described above.From the viewpoint of particularly excellent friction characteristics of a wet clutch, lauryl group, myristyl group, palmityl A straight-chain alkyl or alkenyl group having 12 to 18 carbon atoms such as a group, stearyl group, oleyl group and the like is particularly preferred. R ¹¹³ , R
^{As the} group representing ¹¹⁴ , R ¹¹⁶ and R ¹¹⁷ , specifically,
Each independently a hydrogen atom; methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl,
Dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, icosyl, henycosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl , A nonacosyl group, an alkyl group such as a triacontyl group (the alkyl group may be linear or branched); a butenyl group, a pentenyl group, a hexenyl group, a heptenyl group, an octenyl group, a nonenyl group, a decenyl group, an 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 Alkenyl groups such as pentacosenyl group, hexacosenyl group, heptacosenyl group, octacosenyl group, nonacosenyl group and triaconenyl group (these alkenyl groups may be linear or branched, and the position of the double bond is arbitrary) A cycloalkyl group having 5 to 7 carbon atoms such as a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group; a methylcyclopentyl group, a dimethylcyclopentyl group, a methylethylcyclopentyl group, a diethylcyclopentyl group, a methylcyclohexyl group, a dimethylcyclohexyl group, and a methylethylcyclohexyl Group, diethylcyclohexyl group, methylcycloheptyl group, dimethylcycloheptyl group, methylethylcycloheptyl group, diethylcycloheptyl group, etc.
1 alkylcycloalkyl groups (the substitution positions of these alkyl groups with cycloalkyl groups are also arbitrary); aryl groups such as phenyl group and naphthyl group: tolyl group, xylyl group, ethylphenyl group, propylphenyl group, butylphenyl Group, pentylphenyl group, hexylphenyl group,
Each alkylaryl group having 7 to 18 carbon atoms such as a heptylphenyl group, an octylphenyl group, a nonylphenyl group, a decylphenyl group, an undecylphenyl group, a dodecylphenyl group (the alkyl groups may be linear or branched. And the position of substitution on the aryl group is also arbitrary); arylalkyl groups having 7 to 12 carbon atoms such as a benzyl group, a phenylethyl group, a phenylpropyl group, a phenylbutyl group, a phenylpentyl group, and a phenylhexyl group; The alkyl group may be linear or branched); and the like. As the phosphorus compound (E-2), from the viewpoint of being more excellent in the friction characteristics of a wet clutch, in the above formula (30), an acidic phosphate ester in which at least one of R ¹¹³ and R ¹¹⁴ is a hydrogen atom, or the above formula ( 31) In R)
Acid phosphites in which at least one of ¹¹⁶ and R ¹¹⁷ is a hydrogen atom are more preferably used. Also, (E
Derivatives of phosphorus compounds referred to -2), specifically, at least one acidic phosphoric acid ester and a hydrogen atom of R ¹¹³ and R ¹¹⁴ in formula (30), in the formula (31) R ¹¹⁶ And an acidic phosphite in which at least one of R ¹¹⁷ is a hydrogen atom, is mixed with ammonia or a nitrogen-containing compound such as an amine compound containing only a hydrocarbon group having 1 to 8 carbon atoms or a hydroxyl group-containing hydrocarbon group in a molecule. Examples of such salts include salts obtained by neutralizing some or all of the remaining acidic hydrogen. Specific examples of the nitrogen-containing compound include ammonia; monomethylamine, monoethylamine, monopropylamine, monobutylamine, monopentylamine, monohexylamine, monoheptylamine, monooctylamine, dimethylamine, methylethylamine, and diethylamine. , Methylpropylamine, ethylpropylamine, dipropylamine, methylbutylamine, ethylbutylamine, propylbutylamine,
Alkylamines such as dibutylamine, dipentylamine, dihexylamine, diheptylamine and dioctylamine (the alkyl group may be linear or branched); monomethanolamine, monoethanolamine, monopropanolamine, monobutanolamine, Monopentanolamine, monohexanolamine, monoheptanolamine, monooctanolamine, monononanolamine, dimethanolamine, methanolethanolamine, diethanolamine, methanolpropanolamine, ethanolpropanolamine, dipropanolamine, methanolbutanolamine, ethanolbutanol Amine, propanol butanolamine, dibutanolamine, dipentanolamine, dihexanolamine, diheptano Amines, alkanolamines di octanol amine (alkanol group may be and straight-chain or branched); and mixtures thereof and the like can be exemplified.
Specific examples of the phosphorus compound (E-2) or its derivative include monolauryl phosphate, dilauryl phosphate,
Monostearyl phosphate, distearyl phosphate, monooleyl phosphate, dioleyl phosphate, monolauryl phosphite, dilauryl phosphite, monostearyl phosphite, distearyl phosphite, monooleyl Phosphites, dioleyl phosphites, monolauryl thiophosphate, dilauryl thiophosphate, monostearyl thiophosphate, distearyl thiophosphate, monooleyl thiophosphate, dioleyl thiophosphate, monolaurylthio Phosphites, dilaurylthiophosphites,
Monostearylthiophosphite, distearylthiophosphite, monooleylthiophosphite, dioleylthiophosphite, and these phosphates, phosphites, thiophosphates,
Amine salts of thiophosphites (such as mono-2-ethylhexylamine salt), and mixtures thereof are particularly preferably used.

The fatty acid in the fatty acid amide or metal salt of fatty acid (E-3) may be a linear fatty acid or a branched fatty acid, and may be a saturated fatty acid or an unsaturated fatty acid. Is 6 ~
30, preferably 9 to 24. When the number of carbon atoms of the alkyl group or alkenyl group of the fatty acid is less than 6 or more than 30, the friction characteristics of the wet clutch deteriorate, which is not preferable. Specific examples of the fatty acid include, 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, Saturated fatty acids such as icosanoic acid, henicicosanoic acid, docosanoic acid, tricosanoic acid, tetracosanoic acid, pentacosanoic acid, hexacosanoic acid, heptacosanoic acid, octacosanoic acid, nonacosanoic acid and triacontyl group (these saturated fatty acids may be linear or branched) ); Heptenoic acid, octenoic acid, nonenoic acid, decenoic acid, undecenoic acid, dodecenoic acid, tridecenoic acid, tetradecenoic acid, pentadecenoic acid, hexadecenoic acid, heptadecenoic acid, octadecenoic acid, nonadecenoic acid,
Icosenic acid, henicocenoic acid, docosenoic acid, trichosenoic acid, tetracosenoic acid, pentacosenoic acid, hexacosenoic acid, heptacosenoic acid, octacosenoic acid, nonacosenic acid,
Unsaturated fatty acids such as triacontenic acid (these unsaturated fatty acids may be linear or branched, and the position of the double bond is also arbitrary); From the point of view, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linear fatty acids derived from various fats and oils (coconut oil fatty acids and the like), and linear fatty acids synthesized by the oxo method, etc. A mixture of branched fatty acids is preferably used. As the fatty acid amide referred to in (E-3), specifically, for example, the above fatty acid or acid chloride thereof contains only ammonia, a hydrocarbon group having 1 to 8 carbon atoms, or a hydroxyl group-containing hydrocarbon group in a molecule. An amide obtained by reacting a nitrogen-containing compound such as an amine compound is exemplified. Specific examples of the nitrogen-containing compound include ammonia; monomethylamine, monoethylamine, monopropylamine, monobutylamine, monopentylamine, monohexylamine, monoheptylamine, monooctylamine, dimethylamine, methylethylamine, and diethylamine. , Methylpropylamine, ethylpropylamine, dipropylamine, methylbutylamine, ethylbutylamine, propylbutylamine,
Alkylamines such as dibutylamine, dipentylamine, dihexylamine, diheptylamine and dioctylamine (the alkyl group may be linear or branched); monomethanolamine, monoethanolamine, monopropanolamine, monobutanolamine, Monopentanolamine, monohexanolamine, monoheptanolamine, monooctanolamine, monononanolamine, dimethanolamine, methanolethanolamine, diethanolamine, methanolpropanolamine, ethanolpropanolamine, dipropanolamine, methanolbutanolamine, ethanolbutanol Amine, propanol butanolamine, dibutanolamine, dipentanolamine, dihexanolamine, diheptano Amines, alkanolamines di octanol amine (alkanol group may be and straight-chain or branched); and mixtures thereof and the like can be exemplified.
Specific examples of the fatty acid amide (E-3) include lauric amide, lauric diethanolamide, lauric monopropanolamide, myristic amide, myristic diethanolamide, and the like because of their superior frictional properties of wet clutches. Myristic acid monopropanolamide, palmitic acid amide, palmitic acid diethanolamide, palmitic acid monopropanolamide, stearic acid amide, stearic 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, synthetic fatty acid amide having 12 to 13 carbon atoms, synthesis of 12 to 13 carbon atoms If fatty acid diethanolamide, synthetic mixed fatty acid mono-propanol amide 12 to 13 carbon atoms, and mixtures thereof are particularly preferred.
On the other hand, specific examples of the fatty acid metal salt referred to in (E-3) include alkaline earth metal salts (magnesium salts, calcium salts, etc.) and zinc salts of the above fatty acids. (E-
As the fatty acid metal salt of 3), specifically, calcium laurate, calcium myristate, calcium palmitate, calcium stearate, calcium oleate, and the like, because of their superior frictional properties of wet clutches,
Coconut oil fatty acid calcium, synthetic mixed fatty acid having 12 to 13 carbon atoms, zinc laurate, zinc myristate, zinc palmitate, zinc stearate, zinc oleate, zinc coconut oil fatty acid, synthetic mixed fatty acid having 12 to 13 carbon atoms Zinc, a mixture thereof and the like are particularly preferably used.

One or more arbitrarily selected (E) components can be added in any amount as long as it does not affect other performances, such as oxidation stability. In order to increase the durability of the friction characteristics, it is necessary to prevent the deterioration of the friction characteristics due to the deterioration of the component (E).
It is effective to mix a large amount of the components in order to increase the durability of the friction characteristics. However, if the amount is too large, the coefficient of static friction, which needs to be high to maintain the engagement of the wet clutch, also decreases. Therefore,
There is a limit to the amount of component (E). Therefore, when the component (E) is contained in the traction drive fluid of the present invention, its content is not particularly limited, but usually,
0.005 to 0.005
It is preferably 3.0% by mass, more preferably 0.01 to 2.0% by mass.

When it is necessary to mix the component (E) in an amount exceeding this limit in order to increase the durability of the friction characteristics, an additive ((G)) for increasing the static friction coefficient is used.
Component). The component (G) mentioned here includes the following. (G-1) A compound having a polar group represented by the component (E) in the same molecule and a lipophilic group being a hydrocarbon group having 100 or less carbon atoms. In using the component (G-1), the polar group may be the same as or different from the component (E) used. (G-2) A nitrogen-containing compound (for example, succinimide or amide compound) having a hydrocarbon group having 60 or less carbon atoms, or a boron compound thereof (for example, boric acid or the like)
A compound that is modified with sulfur or a sulfur compound. In the fluid for traction drive of the present invention, (E)
When the component and the component (G) are used in combination, the content of the component (G) is not particularly limited, but is usually preferably 0.1 to 10.0% by mass based on the total amount of the traction drive fluid, and is preferably 0 to 10.0% by mass. More preferably, it is from 0.5 to 3.0% by mass. When the content of the component (G) is less than 0.1% by mass, the effect of increasing the static friction coefficient due to the combined use of the component (G) is poor.
On the other hand, if it exceeds 10.0% by mass, low-temperature fluidity and oxidation stability deteriorate, which is not preferable.

The traction drive fluid of the present invention preferably contains (F) a metal-based detergent.
By blending the (F) metal-based detergent, the friction characteristics of the wet clutch can be optimized, and a decrease in the strength against repeated compression can be suppressed. (F) As the metal-based detergent, a basic metal-based detergent having a total base number of 20 to 450 mgKOH / g, preferably 50 to 400 mgKOH / g is desirable. In addition, the total base number mentioned here is JIS
K2501 "Petroleum products and lubricants-Neutralization number test method" 7. Means the total base number measured by the perchloric acid method in accordance with Total base number of metallic detergent is 20mg KO
If it is less than H / g, the effect of suppressing the decrease in strength of the wet clutch against repeated compression is insufficient, while if the total base number exceeds 450 mgKOH / g, the composition is unstable and Each of them is not preferable because storage stability is deteriorated. Specific examples of the component (F) include, for example, (F-1) an alkaline earth metal sulfonate having a total base number of 20 to 450 mgKOH / g, and (F-2) an alkaline earth metal having a total base number of 20 to 450 mgKOH / g. Phenate (F-3) One or more metal-based detergents selected from alkaline earth metal salicylates having a total base number of 20 to 450 mgKOH / g. As the (F-1) alkaline earth metal sulfonate mentioned here, more specifically, for example, a molecular weight of 100 to 1500,
Alkaline earth metal salts of alkyl aromatic sulfonic acids, particularly magnesium salts and / or calcium salts, obtained by sulfonating alkyl aromatic compounds of 200 to 700 are preferably used, and as the alkyl aromatic sulfonic acids, Specific examples include so-called petroleum sulfonic acid and synthetic sulfonic acid. As the petroleum sulfonic acid, generally, a sulfonated alkyl aromatic compound of a lubricating oil fraction of a mineral oil, a so-called mahoganic acid which is a by-product of white oil production, and the like are used. As the synthetic sulfonic acid, for example, an alkylbenzene having a linear or branched alkyl group, which is obtained as a by-product from an alkylbenzene production plant, which is a raw material of a detergent, or obtained by alkylating a polyolefin to benzene, is used as a raw material. A sulfonated product thereof, or a sulfonated product of dinonylnaphthalene is used. The sulfonating agent for sulfonating these alkyl aromatic compounds is not particularly limited, but fuming sulfuric acid or sulfuric acid is usually used. Also,
More specifically, the (F-2) alkaline earth metal phenate mentioned above has 4 to 30 carbon atoms, preferably 6 carbon atoms.
To 18 linear or branched alkyl groups.
Alkali earth metal salts, particularly the magnesium salts and / or calcium salts of alkyl phenols obtained by reacting this alkyl phenol with elemental sulfur or the Mannich reaction products of alkyl phenols obtained by reacting this alkyl phenol with formaldehyde Is preferably used.
Further, as the (F-3) alkaline earth metal salicylate, more specifically, at least one linear or branched alkyl group having 4 to 30 carbon atoms, preferably 6 to 18 carbon atoms. Alkaline earth metal salts of alkyl salicylic acid, particularly magnesium salts and / or calcium salts, are preferably used. Further, the alkaline earth metal sulfonate, alkaline earth metal phenate and alkaline earth metal salicylate contain 20 to 450 mg of the metal salt.
Within the range of KOH / g, alkyl aromatic sulfonic acid, alkyl phenol, alkyl phenol sulfide, Mannich reaction product of alkyl phenol, alkyl salicylic acid, etc. can be directly converted to magnesium or / and calcium alkaline earth metal oxide or water. Neutral salts (normal salts) obtained by reacting with alkaline earth metal bases such as oxides, or by once replacing alkali metal salts such as sodium salts and potassium salts with alkaline earth metal salts, etc. And further obtained by heating these neutral salts (normal salts) and excess alkaline earth metal salts or alkaline earth metal bases (hydroxides or oxides of alkaline earth metals) in the presence of water. Basic salts or neutral salts (normal salts) in the presence of carbon dioxide can be reacted with alkaline earth metal bases. Overbased salt obtained by (overbased salts) are also included. These reactions are usually performed in a solvent (such as an aliphatic hydrocarbon solvent such as hexane, an aromatic hydrocarbon solvent such as xylene, or a light lubricating base oil). In addition, the metal-based detergent is usually commercially available in a diluted state with a light lubricating base oil or the like, and is available, but generally has a metal content of 1.0 to 20% by mass. , Preferably 2.0 to 16% by mass.
In the traction drive fluid of the present invention, (F)
When the component is contained, the content of the component (F) is not particularly limited, but is usually preferably 0.01 to 5.0% by mass, based on the total amount of the traction drive fluid.
More preferably, it is 0.05 to 4.0% by mass.
When the content of the component (F) is less than 0.01% by mass, the effect of suppressing the reduction in strength of the wet clutch against repeated compression is insufficient. On the other hand, when the content exceeds 5.0% by mass, the oxidation of the composition is oxidized. Each of them is not preferable because the stability is lowered.

(C), (D), (E) and (F)
By containing the components, the traction drive fluid of the present invention has abrasion resistance, oxidative stability and cleanliness required for a hydraulic control mechanism and a friction characteristic for a wet clutch required for a friction mechanism of a wet clutch, and a wet type. It is possible to increase the strength of the clutch against repeated compression, etc., but these properties are further improved, and the corrosion resistance to non-ferrous metals such as copper-based materials and the durability of resins such as nylon materials. If necessary, an antioxidant, an extreme pressure additive, a corrosion inhibitor, a rubber swelling agent, an antifoaming agent, a coloring agent, or the like may be further contained singly or in combination of several kinds. As the antioxidant, any one generally used in lubricating oils such as a phenolic compound and an amine compound can be used. Specifically, 2-6
Alkylphenols such as di-tert-butyl-4-methylphenol, bisphenols such as methylene-4,4-bisphenol (2,6-di-tert-butyl-4-methylphenol), and phenyl-α-naphthylamine; Zinc dialkyldithiophosphates such as naphthylamines, dialkyldiphenylamines, zinc di-2-ethylhexyldithiophosphate, (3,5-di-tert)
-Butyl-4-hydroxyphenyl) fatty acid (such as propionic acid) and a monohydric or polyhydric alcohol such as methanol, octadecanol, 1,6 hexadiol, neopentyl glycol, thiodiethylene glycol, triethylene glycol, and pentaerythritol. And the like. One or two or more compounds arbitrarily selected from these can be contained in an arbitrary amount. Usually, the content is 0.01 to 5.0 based on the total amount of the traction drive fluid. It is desirably 0% by mass. Examples of the extreme pressure additives include sulfur compounds such as disulfides, sulfurized olefins, and sulfurized oils. Any one selected from these
The kind or two or more kinds of compounds can be contained in an arbitrary amount. Usually, however, the content is desirably 0.01 to 5.0% by mass based on the total amount of the traction drive fluid. Examples of the corrosion inhibitor include benzotriazole-based, tolyltriazole-based, thiadiazole-based, and imidazole-based compounds. One or two or more compounds arbitrarily selected from these can be contained in an arbitrary amount.
Its content is desirably 0.01 to 3.0% by mass based on the total amount of the traction drive fluid. Examples of the antifoaming agent include silicones such as dimethyl silicone and fluorosilicone. One or two or more compounds arbitrarily selected from these can be contained in an arbitrary amount. Usually, the content is 0.001% based on the total amount of the traction drive fluid.
It is desirably about 0.05% by mass. The coloring agent can contain any amount, but usually, the content is
0.001-0.001 based on the total volume of traction drive fluid
It is desirably 1.0% by mass.

[0019]

As described above, the traction drive fluid of the present invention is not only excellent in power transmission capacity, but also is a traction drive commercially available conventionally, which is particularly required as a continuously variable transmission for automobiles. Hydraulic fluid, the ability to control the friction characteristics of wet clutches, which is not available in hydraulic fluids, and to fully demonstrate its performance as a traction drive fluid for automobiles. It has become possible.

[0020]

EXAMPLES Hereinafter, the content of the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited thereto. The fluid 1 as the traction drive fluid according to the present invention was obtained by the following method. Fluid 1 Indane 1420 g (about 12.0 mol)
The mixture was placed in a neck flask, cooled to 5 ° C. or lower in an ice bath, and 1240 g (about 12.0 mol) of 95% concentrated sulfuric acid was added. Further cooling was continued, and after the inside of the reaction vessel became 5 ° C. or less, 685 g of 2-methylcyclohexanol (about 6.
0 mol) was added dropwise over 5 hours, and after the completion of the addition, the mixture was further reacted for 2 hours. The reaction solution was transferred to a 5 L separating funnel, and after separating the sulfuric acid phase, it was washed 5 times with 1 L of pure water. Next, the mixture was made alkaline with a 1% aqueous sodium hydroxide solution, and then washed with 1 L of pure water until the aqueous phase became neutral. After separating the aqueous phase, dehydration was performed with anhydrous sodium sulfate.
The light components and excess benzene were removed under the condition of mHg, which was further distilled under reduced pressure.
About 800 g of a fraction having a boiling point of 134.4 ° C. were obtained. This was placed in a 2 L autoclave, 8 g of a nickel-based hydrogenation catalyst was added, and the reaction was carried out at 150 ° C. under the condition of a maximum pressure of 70 kg / cm ² until hydrogen absorption was stopped. Thereafter, the catalyst was separated to obtain about 820 g of a fluid 1 which was a mixture of the following compounds as the target substance.

Embedded image

The thus obtained fluid 1 and isobutene oligomer (comparative fluid 1, number average molecular weight (Mn):
350), the traction coefficient and -3, respectively.
The low-temperature viscosity (BF viscosity (Brookfield method)) at 0 ° C. was measured, and the results are shown in Table 1. The traction coefficient was measured using a 4-roller traction coefficient tester under the conditions of a peripheral speed of 5.23 m / s, an oil temperature of 60 ° C., a maximum hertz pressure of 1.10 GPa, and a slip ratio of 2%.

[0022]

[Table 1]

Next, 2-methyl-2,4, which is already used in the field of the above-mentioned fluid 1, comparative fluid 1 and industrial machinery, and is known to have a high traction coefficient.
Various mixed fluids (fluids 2, 3 and comparative fluids 3, 4) were prepared by using dicyclohexylpentane (comparative fluid 2) and mixing these components at the ratios shown in Table 2. These adjusted fluids 2 and 3, comparative fluids 3 and 4, and comparative fluid 2
, A traction coefficient and a low-temperature viscosity at −30 ° C. (Brookfield method) were measured. Table 2 shows the results.

[0024]

[Table 2]

By mixing the fluid 1 of the present invention with the existing traction drive fluid, 2-methyl-2,4-dicyclohexylpentane (comparative fluid 2), its low-temperature viscosity can be maintained without substantially changing the traction coefficient. Characteristics can be greatly improved.

The above fluid 1 was prepared by blending (B) polymethacrylate (PMA), polyisobutylene (PIB), and hydrogenated ethylene-α-olefin copolymer (OCP) as a viscosity index improver (B) ( Fluid 4 ~
6). For these adjusted fluids 4 to 6 and fluid 1,
The kinematic viscosity at 100 ° C., the low temperature viscosity (BF viscosity) at −30 ° C., and the traction coefficient were measured. Table 3 shows the results.

[0027]

[Table 3]

As is evident from the results in Table 3, by blending the viscosity index improver (B), it becomes possible to greatly increase the high-temperature viscosity without greatly changing its traction coefficient and low-temperature viscosity characteristics. .

In the above fluid 1, (B) a viscosity index improver,
A mixture of (C) an ashless dispersant and (D) a phosphorus-based additive in the ratio shown in each example of Table 4 was prepared (Fluid 7).
~ 13). The fluids 7 to 13 thus adjusted were each evaluated for wear resistance and oxidation stability. Table 4 shows the results. The abrasion resistance was measured according to ASTM D22.
80, 1800 rpm, 30 kgf,
The Shell four-ball test was performed under the conditions of 60 minutes, and the steel balls after the test were evaluated by the wear scar diameter. Oxidation stability is measured according to JIS
According to K2514 lubricating oil acid value stability test, 150
An oxidation test was performed at 96 ° C. for 96 hours to evaluate.

[0030]

[Table 4]

As is evident from the results in Table 4, by combining (C) the ashless dispersant and (D) the phosphorus-based additive, the abrasion resistance and oxidative stability required for the traction drive fluid are reduced. It becomes possible to provide cleanliness.

The above fluid 1 contains (B) a viscosity index improver,
A mixture prepared by mixing additives such as (C) an ashless dispersant, (D) a phosphorus-based additive, (E) a friction modifier, and (F) a metal-based detergent in a ratio as shown in Table 5 is prepared. (Fluid 14-1
9). A low-speed slip test was performed on each of the adjusted fluids 14 to 19, and the fluids 1 and 7 using a slip tester under the following conditions, and the slip speed dependence of the friction coefficient (μ (1 rpm) / μ ( 50 rpm): a positive gradient when this value exceeds 1, and a negative gradient when it is less than 1) was measured. Table 5 shows the results. [Low-speed sliding test] Test condition: Conforms to JASO M349-95 (Test method for preventing oil shudder in automatic transmission) Oil amount: 0.2 liter Oil temperature: 80 ° C Surface pressure: 0.98 MPa

[0033]

[Table 5]

As is evident from the results in Table 5, by blending (E) a friction modifier and / or (F) a metal-based detergent, it was optimized in wet clutches such as shift clutches and slip lock-up clutches. It is possible to impart friction characteristics.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C10M 107/02 C10M 107/02 111/02 111/02 133/04 133/04 133/46 133/46 137 / 00 137/00 143/00 143/00 159/22 159/22 159/24 159/24 169/04 169/04 // C10N 10:04 20:04 30:02 30:04 30:06 40:04 (72) Inventor Tetsuo Okawa 8 Chidoricho, Naka-ku, Yokohama-shi, Kanagawa Pref. R-Lubricant Dept., Lubricating Oil Department, Lubricating Oil Laboratory F-term (reference) LA02 LA03 PA02 PA03

Claims (7)

[Claims] 1. A traction drive fluid represented by the following general formula (1). Embedded image (Wherein, R ¹ represents an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), and R ^{2 to} R ⁸ each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms ( Which may contain a naphthene ring).) 2. The traction drive fluid according to claim 1, further comprising (A) a mineral oil and a molecular weight of 15 or more.
A fluid for traction drive, comprising at least one selected from the group consisting of 0 to 800 synthetic oils. 3. A traction drive fluid according to claim 1 or 2, further comprising (B) a viscosity index improver. 4. The ethylene-α having a number average molecular weight of more than 800 and not more than 150,000, wherein the (B) viscosity index improver is used.
4. An olefin copolymer or a hydride thereof.
A fluid for traction drive according to claim 1. 5. The traction drive fluid according to claim 1, further comprising (C) an ashless dispersant and (D) a phosphorus-based additive. fluid. 6. The traction drive fluid according to claim 1, further comprising (E) at least one alkyl group or alkenyl group having 6 to 30 carbon atoms in the molecule. A traction drive fluid comprising a friction modifier which does not contain a hydrocarbon group having 31 or more carbon atoms in a molecule. 7. The traction drive fluid according to claim 1, 2, 3, 4, 5, or 6, further comprising:
(F) A traction drive fluid comprising a metal-based detergent having a total base number of 20 to 450 mgKOH / g.