JPS6096690A - Fluid for traction drive - Google Patents

Abstract

PURPOSE:To provide the titled fluid which causes little loss of stirring in a speed regulator and exhibits high power transmission, by using a specified naphthenic hydrocarbon together with a specified diluent. CONSTITUTION:The titled fluid consists of at least one compd. (A) selected from among 18C or higher naphthenic hydrocarbons contg. structural nucleus of formula I , II, III, IV, V, VI or VII (wherein R, R' are a bivalent 1-6C hydrocarbon group) [e.g. 1,1'-bisdecalin, 1,1-didecalylethane, or bis-(1-cyclohexylethyl)dimethylcyclohexane] and a branched 6-12C alkylbenzene (B) (e.g. isohexylbenzene or isododecylbenzene) as a diluent. By using the compd. B as a diluent, the viscosity of the fluid can be lowered while retaining a high coefficient of traction inherent to the compd. A. Hence, stirring loss is small and power transmission is high. Accordingly, the fluid can be effectively used in speed regulators for automobile and industrial machines.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a traction drive fluid, and more particularly to a traction drive fluid that causes less stirring loss in a transmission and has a high power transmission rate.

Traction drive fluid is a fluid used in friction drive devices (friction drive devices that make contact with the traction drive), such as continuously variable transmissions for automobiles, hydraulic operating devices, speed change transmission devices, etc., and requires a high traction coefficient. In order to obtain high power transmission efficiency, low viscosity is important.

Various compounds have been proposed as traction drive fluids. For example, Japanese Patent Publication Nos. 46-558, 46-359, 47-35765, 4B-42067, 48-42068, 55-56105, 1983- 451
Examples include those described in Publication No. 08, Publication No. 55-40726, and the like.

However, although these have a high traction coefficient, many of them have a high viscosity, which causes agitation loss in continuously variable transmissions. Therefore, diluents are used to reduce the viscosity, but traction drive fluids using commonly used viscosity diluents such as naphthenic mineral oils have a significantly reduced traction coefficient and heat resistance. There is also the problem that it has an adverse effect on the properties and volatility.

Therefore, the inventors of the present invention have conducted intensive research to solve the above problems, and have found that by using a diluent together with a specific naphthenic hydrocarbon, a high traction coefficient can be maintained, and a traction drive fluid with a low viscosity can be created. They found that it can be obtained and completed the present invention.

That is, the present invention provides (A) having 18 or more carbon atoms, and having the general formula (wherein and P' represent a divalent hydrocarbon group having 1 to 6 carbon atoms).

One or more compounds selected from naphthenic hydrocarbons having a structural nucleus represented by (hereinafter referred to as component (A)) and (B) an alkylbenzene having a branched alkyl group having 6 to 12 carbon atoms. (hereinafter referred to as component (B)).

Component (A) of the present invention is one or more naphthenic hydrocarbons having a carbon number of 18 or more and having a structural nucleus represented by the above general formula. (A) Ingredient is usually 40
It has a high viscosity with a kinematic viscosity of over 2 cat at °C and a high traction coefficient. (A)
Although the component alone can be used as a traction drive fluid, its high viscosity does not provide sufficient power transmission.

Component (A) has 18 or more carbon atoms, preferably 18 to 24 carbon atoms.
It is a heptene-based hydrocarbon having one of the structural nuclei shown below in its molecule.

In the above general formula, l]' represents a divalent hydrocarbon group having 1 to 6 carbon atoms. Here, there are various types of hydrocarbon groups, such as methylene groups, ethylene groups, trimethylene groups, and those substituted with methyl groups, ethyl groups, etc. Component (A) of the present invention may have an alkyl substituent such as a methyl group or an ethyl group introduced into the nucleus or hydrocarbon group, as long as it has the above-mentioned structural nucleus.

Specifically, the component (A) is 1,1'-bisdecalin,
1.2'-bisdecalin, 1,1-didecalylethane,
1,1-didecalylbutane, 1,1-didecalylbutane, 1,1-di(bicyclohexyl)ethane, 1.1-
Di(bicyclohexyl)propane, 2,4.6-)dicyclohexyl-2-methylhexane, 1-cyclohexyl-1-(dicyclohexyl/I/)-ethane, 1-cyclohexyl-1-(2-cyclohexylethyl) Cyclohexane, 1-cyclohexy/I/-1-(2,4-dicyclohexylbutyl)cyclohexane, 1-(2-decalyl)-1-cyclohexylethane, 1-(1-decaryl)-1-cyclohexylethane, 1 -(2-decalyl) -j -(4-(tert-butyl)cyclohexyl)ethane, 1-(1-decalyl)-1-(4-(t
+ert-butyl)cyclohexyl)ethane, 1-dimethyldecaryl-1-cyclohexylethane, 2,4-dicyclohexyl-2-methylpentene, 1-cyclohexyl-1-dicyclohexylmethane, 1-cyclohexylmethylsulfate hexyl-1-cyclohexylethane,
Dicyclohexyl-cyclohexane, 1-methyldecaryl-cyclohexylethane, bis-(1-cyclohexylethyl)dimethylcyclohexane.

Bis-(1-cyclohexylmethyl)-methylcyclohexane and mixtures of two or more thereof can be mentioned.

Component (A) of the present invention is an alkylbenzene having a branched alkyl group having 6 to 120 carbon atoms, and serves to dilute component (A) to lower its viscosity. Component (B) usually has a boiling point range of 200 to 250°C and a kinematic viscosity of 2 to 5 cs.
Those having properties of t (40° C.) are preferable. Specifically, isohexylbenzene.

Isohbutylbenzene, isooctylbenzene.

Examples include isononylbenzene, isodecylbenzene, isoundecylbenzene, and indodecylbenzene.

The present invention is a traction drive fluid comprising the above components (A) and (B). The amount of component (B), which is a diluent, varies depending on the purpose of use and the type of component (A), and cannot be determined unambiguously, but it usually has a kinematic viscosity of 20 cst or less at 40°C after dilution, The amount is preferably 10 to 20 oat. Generally (A
) component/(B) component (weight ratio) is preferably 0.5 or more, preferably 3 or more. For example, component (A) is 1-cyclohexyl-1-(dicyclohexyl)ethane and (B)
When the component is isononylbenzene 1 (A) component/(B)
Ingredients = 85/15 (weight ratio) 500at (4o''C)
Tona υ, 76/24 (weight ratio) 20cat (40℃)
becomes.

In the traction drive fluid of the present invention, since the diluent as the component (B) is specified as described above, the viscosity can be reduced while maintaining the inherently high traction coefficient of the component (A). As a result, stirring loss is small and power transmission rate is high. Therefore, the traction drive fluid of the present invention can be used very effectively in transmissions of automobiles and industrial machines.

Next, the present invention will be explained using examples.

Example 1 Propylene was reacted in the presence of a phosphoric acid-silica catalyst at a temperature of 1
Underpolymerization was carried out at 80° C. and 30 H/cal a pressure to obtain a fraction with a boiling point range of 145 to 175° C. whose main component was propylene trimer. Next, 1,500 f of benzene + 60 ff of anhydrous aluminum chloride were put into a 5-ton Mitsuro flask and the temperature was raised to 50°C, and then the distillate containing the propylene trimer as the main component was distilled to 400 F! -3
The mixture was added dropwise over a period of time, and stirring was continued for an additional hour to complete the reaction.

After washing the reaction product and distilling off unreacted benzene,
500 fractions with a temperature range of 220-250℃ by vacuum distillation
I got 1. This fraction was mainly composed of isononylbenzene, and had a specific gravity of 0.86 (15/4°C) and a kinematic viscosity of 2.2 ost (40°C).

Meanwhile, in a 3L glass flask, 800p of phenylcyclohexane, 2001p of n-hexane, and 300p of concentrated sulfuric acid were added.
? was added and cooled to 0°C. Styrene (260 ff) was added dropwise over 6 hours while stirring while maintaining the reaction temperature at 0°C, and the reaction was completed by further stirring for 1 hour. After the stirring was stopped, the mixture was allowed to stand, the sulfuric acid layer and the oil layer were separated, and the oil layer was mixed with 1 t of 5% sodium hydroxide aqueous solution and 1 t of saturated saline, respectively.
After washing twice, it was dried with anhydrous sodium sulfate. solution n-
The hexane and unreacted phenylcyclo are removed by distillation and then distilled to a boiling point of 130-143°C. Is sea bream H? Fraction 5201 was obtained.

Analysis of this fraction revealed that it was 1-phenyl-1-(cyclohexylphenyl)ethane.

Next, this fraction 5001 was placed in a 1 ton autoclave and nickel catalyst (manufactured by JGC Chemical Co., Ltd.: M-11s) 50μ
% and hydrogen pressure 50 kg/cri G.

Hydrogenation was carried out at a temperature of 200°C for 6 hours.

As a result of removing light components from the reaction product and analyzing it, it was confirmed that the hydrogenation rate was 99.9% or more, and the main component was 1-cyclohexyl-1-(dicyclohexyl)ethane. Ta.

The thus obtained isononylbenzene 241 and 1-cyclohexyl-1-(dicyclohexyl)ethane (kinematic viscosity 6 B, D QBt (40°C), traction coefficient 0.091 (50°C)) 76P were The mixture was blended to have a kinematic viscosity of 20 cat at 40°C. The traxxilon coefficient of the resulting mixture at 30°C is 0.0
It was 87.

The traction coefficient was measured using a two-cylinder friction tester. In other words, one side of cylinders of the same size (diameter 60cm, thickness 6wI+) that are in contact with one line is moved at a constant speed (2
o o o r, p wind), and rotate the other cylinder at a slower constant speed (170 o r, p, m,),
A load of 140 kg was applied to the contact portion of the 100 cylinders using a spring, and the torque was measured using a strain gauge and a torque meter to determine the traction coefficient. The cylinder is made of carbon@5ON-3, and the surface is puffed with alumina (0.05μ), and the surface roughness is Rmax x O,2.
.mu., and the Hertzian contact pressure was 75 kg/.mu.2.

Comparative Example 1 In the same manner as in Example 1, propylene was underpolymerized to obtain a fraction with a boiling point range of 170 to 220°C, which mainly consists of day and pentate forms of propylene. This fraction was reacted with benzene in the same manner as in Example 1, and the boiling point range was 28.
0-525℃ fraction 5001 was obtained. This fraction mainly consists of isododecylbenzene and isopentadecylbenzene, and has a specific gravity of 0.87 (1574℃) and a kinematic viscosity of 6.
．． 1 cat (40”c).

Distillate 43? was added to 1-cyclohexyl-1-(dicyclohemicyl)ethane 571 to give a kinematic viscosity of 20 cat at 40'CK. The traction coefficient of the resulting mixture at 50"C is 0.08
It was 2.

Comparative Example 2 Naphthenic mineral oil (specific gravity 0.91 (15/4°C), kinematic viscosity 9.2 cst (40°C)) 549- was mixed with 1-cyclohexyl-1-(dicyclohexyl)ethane 46? The kinematic viscosity at 40"CK was set to 20 cat.

The resulting mixture has a traction coefficient of 0 at 50°C.
．． It was 074.

Patent applicant: Idemitsu Kosan Co., Ltd.

Claims (1)

[Scope of Claims] (z) (A) has 18 or more carbon atoms and is represented by the general formula (wherein P and B' represent a divalent hydrocarbon group having 1 to 6 carbon atoms); 1. A traction drive fluid comprising one or more compounds selected from naphthenic hydrocarbons having a structural nucleus, and (B) an alkylbenzene having a branched alkyl group having 6 to 12 carbon atoms.