JPS6210194A - Fluid composition for traction drive - Google Patents

Abstract

PURPOSE:To obtain the title compsn. having a high traction coefficient as well as excellent oxidation stability, abrasion resistance, rust prevention and shear stability, by incorporating zinc dialkyldithiophosphate, alkenylsuccinimide and a partial ester of a carboxylic acid with a polyhydric alcohol in a particular hydrocarbon compd. CONSTITUTION:A base oil comprising a hydrocarbon compd. of the formula [wherein R1-R3 are each independently a 1-4 alkyl; R4-R5 are each independently (1-4 alkylene-substd.) mehtylene, ethylene or trimethylene; a-c are each independently an integer of 0-2; and x is an integer of 0 or 1] (e.g.: 2,4- dicyclohexyl-2-melthylpentane) is blended with 0.1-5wt.% (by weight based on the total weight of the compsn.; the same applies hereinafter) zinc dialkyldithiophosphate, 0.1-5% alkenylsuccinimide or its boron compd. derivative, and 0.01-5% a partial ester of a carboxylic acid with a 3-6C polyhydric alcohol (e.g.: monoester of glyceride decanoate) and, if necessary, 0.1-20% polyolefin having an average molecular weight of 200-10000 and obtd. by (co)polymerizing a 2-8C olefin.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a fluid composition for traction drives, and more particularly to a fluid composition for use in traction drive devices, which has a particularly high traction coefficient, oxidation stability, and wear resistance. The present invention relates to a fluid composition for traction drives that has excellent durability, anti-corrosion properties, and rolling fatigue life.

Conventional technology traction drive devices, such as ball and cone type, cone and ring type, wheel and disc type, chain and sheave type,
In the power transmission section of traction drive devices such as toroidal type and planetary roller type, power is transmitted using the rolling friction generated by the hardening of the lubricating oil film on the rolling contact surface, so the lubrication used there Oil, ie, the traction drive fluid, is required to have excellent power transmission ability, ie, traction coefficient.

At the same time, traction drive fluids are exposed to high temperatures and high loads, so even when used for long periods of time under such harsh conditions, sludge does not form, resulting in excellent oxidation stability and shear stability, and a reduced traction coefficient. It is necessary not to do so.

Furthermore, depending on the environment in which the traction drive device is used, moisture may enter the device and cause rust, which gets caught in the friction surface and causes pitting and flaking on the contact surface of the friction wheel, which can significantly shorten the life of the friction wheel. It may reduce the Therefore, the traction drive fluid must have excellent rust prevention properties.

Traction drive fluid also lubricates not only the friction wheels of the traction drive system, but also other parts such as bearings, gears, and actuators, so it must have excellent wear resistance and flaking resistance. It is.

Problems to be Solved by the Invention However, although various known traction drive fluids meet some of the above-mentioned required properties,
None of them met all requirements and was not suitable for use in traction drive devices.

In addition, various additives are generally known to satisfy each of the above required properties, but if a traction drive fluid containing a combination of these additives is used, the fatigue life of friction wheels, bearings, gears, etc. will be significantly shortened. Moreover, the C pull coefficient often also decreased.

Therefore, the inventors of the present invention conducted repeated research to develop a traction drive fluid that satisfies all of the above performance requirements. It has been discovered that when compounds are blended in a specific combination as essential components, an excellent fluid composition for traction drives can be obtained that satisfies all of the above required performances and does not reduce rolling fatigue life or traction coefficient. , we have completed the present invention.

The present invention has a high traction coefficient, oxidation stability and shear stability that can withstand long-term use at high temperatures and high loads, and the traction coefficient does not decrease. The purpose of the present invention is to provide an excellent traction drive fluid composition.

Means for Solving the Problems The present invention includes two inventions, and the specific invention is based on the general formula Atom has 1 to 4 carbon atoms
a methylene group, ethylene group or trimethylene group which may be substituted with an alkyl group, and a, b, c are O
-2, and X represents an integer of O or 1, respectively. ) is used as a base oil, and based on the total amount of the composition, (A) 0.1 to 5% zinc dialkyldithiophosphate (B) alkenylsuccinimide or its boron compound derivative 0 .1 to 5% carboxylic acid partial ester of polyhydric alcohol having 3 to 6 carbon atoms (C) 0.01 to 5% carboxylic acid partial ester of polyhydric alcohol having 3 to 6 carbon atoms as essential components A fluid composition is provided. On the other hand, the second invention is based on the general formula (where R+, R2 and R3 are alkyl groups having 1 to 4 carbon atoms, and R4 and Rs are hydrogen atoms having 1 to 4 carbon atoms.
4 represents a methylene group, ethylene group or trimethylene group which may be substituted with an alkyl group, a, b and c represent an integer of 0 to 2, and X represents an integer of O or 1, respectively. ) is used as a base oil, and based on the total amount of the composition, (A) 0.1 to 5% by weight of zinc dialkyldithiophosphate, (B) 0.1 to 5% by weight of alkenylsuccinimide or its boron compound derivative. 1 to 5% by weight, (C) 0.01 to 5% by weight of carboxylic acid partial ester of polyhydric alcohol having 3 to 6 carbon atoms, (D) homopolymerization or copolymerization of olefin having 2 to 8 carbon atoms. The present invention provides a fluid composition for a traction drive, characterized in that it contains 0.1 to 20% by weight of the obtained polyolefin having an average molecular weight of 200 to 10.000 as an essential component.

Hereinafter, the content of the present invention will be explained in more detail.

The base oil of the traction drive fluid composition of the present invention is:
It is a hydrocarbon compound represented by the following formula (1).

λ In formula (1), R+, R2 and Ryo have 1 carbon number.
-4 alkyl group, R4 and R3 represent a methylene group, ethylene group or trimethylene group whose hydrogen atoms may be substituted with an alkyl group having 1 to 4 carbon atoms, preferably a methyl group, and a, b and C represents an integer of O to 2, and X represents an integer of O or 1.

Specific examples of R+, R2 and Ri in formula (1) include methyl, ethyl, propyl and butyl groups, with methyl and ethyl groups being preferred. Further, R4 and R2 are specifically, for example, methylene group, methylethylene group (ethylidene group), dimethylmethylene group, ethylene group, methylethylene group, 1
, 1-dimethylethylene group, 1.2-dimethylethylene group, i, 1.2-trimethylethylene group, tetramethylethylene group, trimethylene group, 1-methyl 1-rimethylene group, 2-methyltrimethylene group, 1. 1-dimethyltrimethylene group, 1,2-dimethyltrimethylene group, 1,
3-dimethyltrimethylene group, 2.2-dimethyltrimethylene group, 1,1.2-trimethyltrimethylene group, 1
．． 1.3-trimethyltrimethylene group, 1.2.2-trimethyltrimethylene group, 1,2.3-trimethyltrimethylene group, 1.1,2.2-tetramethyltrimethylene group, 1.1.2 .3-tetramethyltrimethylene group,
1.1.3.3-tetramethyltrimethylene group, 1.2
．． Preferred examples include 2,3-tetramethyltrimethylene group.

In the present invention, preferred compounds represented by general formula (1) used as the base oil of the traction drive fluid composition include, for example, dicyclohexylmethane, 1.1-dicyclohexylethane, 1.2
-dicyclohexylethane, 1,2-dicyclohexylpropane, 1°3-dicyclohexylpropane, 2.2
-dicyclohexylpropane, 1,2-dicyclohexyl-2-methylpropane, 1,3-dicyclohexylbutane, 1,3-dicyclohexyl-3-methylbutane,
1,3-dicyclohexyl-2,3-dimethylbutane,
2.3-dicyclohexyl-2゜3-dimethylbutane,
2.4-dicyclohexylpentane, 2.4-dicyclohexyl-2-methylpentane, bis-(cyclohexylmethyl)cyclohexane, bis-(1-cyclohexylethyl)cyclohexane, bis-(1-methyl-2-
Examples include cyclohexane (cyclohexylethyl), compounds in which the hydrogen atoms of the cyclohexyl ring of these compounds are substituted with 1 to 2 methyl groups or ethyl groups, and mixtures thereof.

Particularly preferred compounds as base oils in the present invention are 1-
Cyclohexyl-1-methylcyclohexylethane, 1
-cyclohexyl-1-ethylcyclohexylethane,
1-cyclohexyl-1-dimethylcyclohexylethane, bis-(1-cyclohexylethyl)methylcyclohexane, bis-(1-cyclohexylethyl)ethylcyclohexane, bis-(1-cyclohexylethyl)
dimethylcyclohexane, 2,4-dicyclohexyl-
2-methylpentane and mixtures thereof.

On the other hand, component (A) as referred to in the present invention is zinc dialkyldithiophosphate, and specifically is a compound represented by the general formula. In the formula, R6, R? .

R8 and R9 may be the same or different and each represents an alkyl group or alkylaryl group having 3 to 22, preferably 3 to 15 carbon atoms.

Ra, R? , Rs and R5 are particularly preferable alkyl groups and alkylaryl groups, specifically, for example, isopropyl group, 5ec-butyl group, isobutyl group, n-amyl group, isoamyl group, 4-methylpentyl group, 2-ethylhexyl group. group, decyl group, isodecyl group, nonylphenyl group, dodecylphenyl group, etc.

The blending amount of component (A) is 0.00% based on the total amount of the composition.
The amount is 1 to 5% by weight, preferably 0.5 to 3% by weight.

If the blending amount of component (A) does not reach the above range, the wear resistance and oxidation stability of the composition will be poor, while if the blend exceeds the above range, the rolling fatigue life and traction coefficient of the composition will deteriorate. Each of these is undesirable because it has an adverse effect and leads to an increase in costs.

In addition, component (B) as used in the present invention refers to alkenyl succinimide or its boron compound derivative.Alkenyl succinimide is produced by reacting polyolefin with a molecular weight of 300 to 5,000 with maleic anhydride. It is imidized using amines, and the polyolefin includes olefins having 2 to 30 carbon atoms, such as ethylene, propylene, butene, pentene, hexene, heptene, octene, nonene, decene, dodecene, etc. Homopolymers and copolymers of olefins, and copolymers of these olefins and aromatic olefins such as styrene are used.Among the amines used for imidization, specifically, for example, methylamine, Monoamines such as ethylamine, propylamine, butylamine, pentylamine, hexylamine, heptylamine, octylamine, ethylenediamine, propylenediamine, N,N-dimethylbutylenediamine, trimethylenediamine, N,N-dihexyltrimethylenediamine, Decamethylenediamine, di<trimethylene)triamine, di(heptamethylene)triamine, triethylenetetramine, tripropylenetetramine, tetraethylenepentamine, pentaethylenehexazine, imidacilline, methylimidacillin, bis(aminoethyl)imidacilline, pyrimidine , polyamines such as aminopropylpiperazine, bis(amineethyl)piperazine, N-
Mono(hydroxyethyl)ethylenediamine, N,N”
-bis(hydroxyethyl)ethylenediamine, N-mono(hydroxypropyl)diethylenetriamine, N,
Examples include hydroxy-substituted amines such as N'-bis(hydroxypropyl)tetraethylenepentamine.

Further, the boron compound derivative of alkenyl succinimide is a reaction product of the above-mentioned alkenyl succinic acid, amines, and boron compound, and specific boron compounds include, for example, boron oxide, boron oxide hydrate, Examples include boron trifluoride, boron trichloride, boron tribromide, alkyl or aryl boronic acids, boric acid, metaboric acid, tetraboronic acid, and esters and ammonium salts of these boric acid-containing acids with alcohols and phenols. Various methods are known as methods for synthesizing boron compound derivatives of alkenylsuccinimide. Specifically, for example, U.S. Pat.
2.955, 3゜284.410, 3.2
No. 84.409, No. 3.344.069, No. 3,
No. 533.945, Special Publication No. 42-8013, No. 42-
No. 8014, No. 47-45161, No. 47-4516
No. 2, JP-A-51-52381, JP-A No. 51-13040
No. 8, No. 54-87705, etc.

The mixing ratio of component (B) is 0.00% based on the total amount of the composition.
It is 1 to 5% by weight, preferably 0.5 to 3% by weight.

If the blending amount of component (B) does not reach the above range, the oxidation stability (sludge formation prevention property) of the composition will be poor, while if the blending ratio exceeds the above range, the rolling fatigue life and traction of the composition will deteriorate. Each of these is undesirable because it adversely affects the modulus and wear resistance and leads to an increase in cost.

Further, component (C) as used in the present invention refers to a carboxylic acid partial ester of a polyhydric alcohol having 3 to 6 carbon atoms. Specific examples of polyhydric alcohols having 3 to 6 carbon atoms include glycerin [CiHs(OH)g], pentaerythritol [C4)-1°(OH)a],'))Ltbit[C6Ha( OH)6] and sorbitan (Cs
HaO(OH)a], etc. on the other hand,
The carboxylic acid mentioned here usually has 8 to 22 carbon atoms,
Preferably 12 to 18 carboxylic acids, specifically such as decanoic acid (capric acid), undecanoic acid, dodecanoic acid (
Lauric acid>1. Tridecanoic acid, tetradecanoic acid (myristic acid), pentadecanoic acid, hexadecanoic acid (palmitic acid), heptadecanoic acid (margaric acid), octadecane M (stearin M), nonadecanoic acid, eicosanoic acid (araxic acid), heneicosanoic acid, tocosanoic acid (behenic acid), dodecenoic acid, tetradecenoic acid, hexadecenoic acid, octadecenoic acid (oleic acid), dodecadienoic acid, tetradecadienoic acid, hexadecadienoic acid, octadecadienoic acid (linoleic acid), and the like.

Preferred esters as component (C) of the present invention include:
Specifically, for example, glycerine dodecanoic acid monoester (
lauric acid monoglyceride), glycerin hexadecanoic acid monoester (palmitic acid monoglyceride),
Glycerin octadecanoic acid monoester (stearic acid monoglyceride), glycerin octadecenoic acid monoester (oleic acid monoglyceride), pentaerythritol dodecanoic acid monoester (pentaerythritol monolaurate), pentaerythritol hexadecanoic acid monoester (pentaerythritol) monopalmitate),
Pentaerythritol octadecanoic acid monoester (pentaerythritol monostearate), pentaerythritol octadecenoic acid monoester (pentaerythritol monooleate), nrubitododecanoic acid monoester (
nrupit monolaurate), nlupit hexadecanoic acid monoester (sorbit monopalmitate (nrubit monostearate), sorbit octadecenoic acid monoester (sorbit monooleate), sorbitan dodecanoic acid monoester (sorbitan monolaurate)
, sorbitan hexadecanoic acid monoester (sorbitan monopalmitate), sorbitan octadecenoic acid triester (sorbitan monostearate), sorbitan octadecenoic acid monoester (sorbitan monooleate), sorbitan octadecanoic acid triester (sorbitan tristearate) , sorbitan octadecenoic acid triester (sorbitan trioleate), and mixtures thereof.

The blending amount of this component (C) is 0.00% based on the total amount of the composition.
01-5% by weight, preferably 0.1-3% by weight.

If the blending amount of component (C) does not reach the above range, the rust prevention properties of the composition will be poor, while if the blending amount exceeds the above range, it will adversely affect the rolling fatigue life and traction coefficient of the composition. Moreover, each of these is undesirable because it leads to an increase in cost.

According to the present invention, the above-mentioned hydrocarbon compound is used as a base oil,
If the above-mentioned components (A), (B) and (C) are blended as essential components a predetermined number of times, a traction drive fluid composition with excellent various performances can be obtained. According to the second invention, if a specific polyolefin is further blended in a predetermined manner, a traction drive fluid composition with even higher viscosity and excellent shear stability can be obtained.

That is, component (D) in the second invention of the present invention is a compound having an average molecular weight of 200 to 10,00 obtained by homopolymerizing or copolymerizing an olefin having 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms.
0, preferably from 1,000 to 4,000. This polyolefin is made from olefins such as ethylene, propylene, 1-butene, and isobutylene as raw materials, and so-called Friedel-Crach type catalysts such as aluminum chloride, magnesium chloride, boron fluoride, and titanium tetrachloride, or complex compounds thereof. As a catalyst,
Using a promoter such as an organic halide or hydrochloric acid as necessary,
It can be obtained by homopolymerization or copolymerization. Among these polyolefins, polybutene, polyisobutylene, ethylene-propylene copolymer, ethylene-1-butene copolymer, ethylene-propylene-1-butene copolymer, and the like are particularly preferred.

The blending amount of component (D) is 0.1 based on the total amount of the composition.
-20% by weight, preferably 1-10% by weight.

(D> If the blended amount of the component does not reach the above range, (D
) The effect of ingredient blending is poor, the viscosity of the composition does not increase,
On the other hand, when the blending amount exceeds the above range, the traction coefficient of the composition decreases, which is not preferable.

In addition, in the traction drive fluid composition of the present invention, various additives may be added as necessary, such as metal detergents such as alkali metal or alkaline earth metal sulfonates, corrosion inhibitors, extreme pressure agents, viscosity index improvers, It is also possible to add a rust inhibitor or the like.

EXAMPLES Hereinafter, the content of the present invention will be explained in more detail with reference to Examples and Comparative Examples.

Examples 1 to 6 and Comparative Examples 1 to 2 Traction drive fluid compositions according to the present invention were manufactured using the compositions shown in Table 1 (Examples 1 to 6). Performance evaluation tests for these compositions were conducted using the method shown below, and the results are also shown in Table 1.

[Kinematic viscosity]

It was measured according to JIS K 2283.3 kinematic viscosity test method.

[Towing coefficient]

Using a convex cylindrical rolling friction tester, the rolling speed was 310.
Measurements were made under the conditions of cm/sec, load of 90 ka/n+m2, and slip rate of 2%.

[Oxidation stability]

A test was conducted at 165.5°C for 72 hours in accordance with JIS K 2514.3.1 lubricating oil oxidation stability test method for internal combustion engines, and the viscosity ratio at 40°C was measured.

[Shear stability]

A test was conducted at 10KH2 at 40°C for 30 minutes in accordance with ASTM D 2603 Sonic Shear Test Method for Polymer Mixed Oils, and the viscosity reduction rate at 40°C was measured.

(Abrasion Resistance) A test was conducted at 1500 rpm and 40 kgrx for 2 hours in accordance with ASTM D 2266 four-ball test method, and the wear radius was measured.

[Fatigue life]

Lll = 90% life time was measured according to the IP305 UniSteel rolling fatigue test method.

[Rust resistance]

It was measured according to JIS K 2510.2.5.1 lubricating oil rust prevention performance test method.

For comparison, similar performance evaluation tests were also conducted for base oil only (Comparative Example 1) and commercially available traction drive fluid A (Comparative Example 2), and the results are also listed in Table 1.

The components (B) and (D) shown in Table 1 are as follows.

(B) Component - Alkenylsuccinimide polyisobutylene (molecule 1a1.000) ffi Reaction product of succinic anhydride and N-octadecyltrimethylenediamine - Boronated alkenylsuccinimide polyisobutylene (molecule ff1l, 000) Reaction product of substituted succinic anhydride, N-octadecyltrimethylene diamine and boric acid Component (D) - Polybutene A: average molecule ff12.700 - Polybutene B: average molecule ff1l, 350 - ethylene-
Propylene copolymer: average molecular weight 3,700 Effects of the Invention As can be seen from the performance evaluation test results in Table 1, horn drive fluid compositions 1 to 1 according to the present invention (Example 1)
-6) have many excellent performances compared to the base oil only (Comparative Example 1) and commercially available traction drive fluids (Comparative Examples 2 and 3), and the traction drive fluid composition of the present invention The excellence of the product is obvious.

Claims (1)

[Claims] [1] General formula ▲ Numerical formulas, chemical formulas, tables, etc. ▼ (1) (In the formula, R_1, R_2 and R_3 are alkyl groups having 1 to 4 carbon atoms, and R_4 and R_5 are their hydrogen atoms. A methylene group, ethylene group or trimethylene group which may be substituted with an alkyl group having 1 to 4 carbon atoms, and a, b
, c, represent an integer of 0 to 2, and x represents an integer of 0 or 1, respectively. ) is used as a base oil, and based on the total amount of the composition, (A) 0.1 to 5% by weight of zinc dialkyldithiophosphate, (B) 0.1 to 5% by weight of an alkenylsuccinimide or its boron compound derivative. 1 to 5% by weight, and (C) 0.01 to 5% by weight of a carboxylic acid partial ester of a polyhydric alcohol having 3 to 6 carbon atoms as essential components. . [2] General formula ▲ Numerical formulas, chemical formulas, tables, etc. ▼ (1) (In the formula, R_1, R_2 and R_3 are alkyl groups with 1 to 4 carbon atoms, and R_4 and R_5 are hydrogen atoms whose hydrogen atoms have 1 to 4 carbon atoms. methylene group, ethylene group or trimethylene group which may be substituted with alkyl group of 4, and a, b
, c, represent an integer of 0 to 2, and x represents an integer of 0 or 1, respectively. ) is used as a base oil, and based on the total amount of the composition, (A) 0.1 to 5% by weight of zinc dialkyldithiophosphate, (B) 0.1 to 5% by weight of an alkenylsuccinimide or its boron compound derivative. 1 to 5% by weight, (C) 0.01 to 5% by weight of carboxylic acid partial ester of polyhydric alcohol having 3 to 6 carbon atoms, (D) homopolymerization or copolymerization of olefin having 2 to 8 carbon atoms. A fluid composition for a traction drive, comprising 0.1 to 20% by weight of the obtained polyolefin having an average molecular weight of 200 to 10,000 as an essential component.