JPS6119698A - Traction oil composition - Google Patents

Abstract

PURPOSE:To provide the titled compsn. having a high coefficient of traction, a high viscosity index and excellent oxidation stability, corrosionproofness, shear stability and flow characteristics, by blending a hydrogenated product of a thermoplastic resin contg. a specified arom. ring with a base oil. CONSTITUTION:A thermoplastic resin having a skeleton contg. an arom. monocyclic ring such as phenyl group and a condensed ring such as indenyl group such as a styrene/acrylonitrile copolymer, is dissolved in a small quantity of base oil and hydrogenated in the presence of 0.1-20wt% hydrogenation catalyst such as Pt at 100-450 deg.C under H2 pressure of 10-200kg/cm<2>G for 0.5-20hr to obtain a hydrogenated thermoplastic resin (A) contg. arom. ring having a hydrogenation rate of 30-100%. 1-80wt% component A is dissolved in a naphthenic base oil having a kinematic viscosity of 1-150cSt (40 deg.C), a pour point of 15 deg.C or below and a flash point of 100 deg.C or above (e.g. bicyclohexyl) to obtain the titled compsn.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to traction oil compositions. Specifically, the present invention relates to a traction oil composition having a high traction coefficient.

Conventional technology Gear devices and hydraulic devices have traditionally been used to transmit power or change speeds, but there is also a point contact or line contact drive system for rotating rigid bodies called 1-Laxcon drive (rolling friction drive device). It is well-known that it does not interrupt the meshing of gears, causes less vibration during operation, and has high power transmission efficiency, so it is beginning to be put into practical use in some industrial machinery.

In this case, the lubricating oil that is most suitable for the oil present in the contact parts of the device must be selected from a functional standpoint.

In other words, in a traction drive device, power is transmitted using the rolling friction generated by hardening of the oil film of the fluid on the rolling contact surface, so the oil present in the contact area is reversibly coated with glass under high pressure. As the viscosity increases due to the transition, the power transmission effect on the rotating contact surface is large, and rolling friction is large.

), has the property of returning to a fluid state immediately after leaving the contact surface, and has the property of straight I! between metal objects! It must prevent contact, seize, wear and fatigue damage, and also have the same important functions as general lubricants, such as rust prevention and cooling.

Friction or traction drive devices for power transmission have been described in many prior technical documents, such as U.S. Pat. No. 3,394,603;
, No. 369 Mei 1I, Journal of Chemical
& Engineering Data Vol. 5 No. 4 No. 49
9 to 507, and the proceedings of a symposium on rolling contact phenomena by Huco et al., pp. 157 to 185 [Nilsepia Publishing (Amsterdam), 1962].

In addition, as traction oil, mineral oil
24.635), mixed oil of dialkyl aromatic hydrocarbon and diallyl alkane (Special Publication No. 47-40.525),
Polymethyl methacrylate (Special Publication No. 4B-31,828
No.): Pivalic acid monoester (Special Publication No. 4911.30
No. 9), halogenated alkylnaphthalene (Special Publication No. 1973-
16゜900), Adamantane @ (Special public 11B4B-
42゜067 and 48-42,068), polyolefins (JP-A-46-4,766 and JP-A-47
-2,229), alkylnaphthalene (U.S. Patent No.
,549. ．． No. 377) and many others have been proposed.

Furthermore, there are many proposals regarding naphthenic oils having hydrogenated rings. Such naphthenic oils include dicyclohexylethane (Japanese Patent Publication No. 48-29.715) and dicyclohexylpropane (Japanese Patent Publication No. 36.105-1981).
, hydrogenated fused ring compounds (U.S. Pat. No. 3,411,369
), naphthenes with one or more saturated carbon-containing cyclic rings (U.S. Pat. No. 3,440,894), naphthenes with two or more saturated carbon-containing cyclic rings (U.S. Pat. No. 3,925,217) (U.S. Pat. No. 3,595,796 and U.S. Pat. No. 3)
, No. 595, 797). Also, JP-A-55-4
No. 3,108 summarizes and introduces these prior art techniques, and then describes the products obtained by hydrogenating alkylation reaction products of styrene with xylene and/or 1-toluene (mainly hydrogenated 1,1- It is said that diallylethane-based compounds) are superior among naphthenic oils.

Furthermore, as naphthenic oils having hydrogenated rings, JP-A-55-40,726 and JP-A-55-60.5
No. 96, as well as JP 58-2.7゜838 and JP 57-172,992? j and JP-A-58-122,
No. 994 etc. have been reported.

As a result of our research, we have developed the present invention in order to take advantage of the excellent properties of 1- to 1-rank fluorocarbon oils, especially naphthenic oils, as traction oils while further increasing the rolling 1m coefficient, or traction coefficient. be.

1IIIf1 Points to be Solved by the Invention The present invention aims to provide a novel TC composition useful as a traction oil. A further object of the present invention is to provide a traction oil composition that can provide large rolling friction while maintaining fluid lubrication.

Means for Solving the Problems The above-mentioned problems are achieved by a traction oil composition comprising a base oil mixed with a hydrogenated thermoplastic resin having an aromatic ring.

The present invention also provides a 1-lacticone oil composition in which the hydrogenation rate of the hydride of a thermoplastic resin having an aromatic ring is 30 to 100%. The present invention also provides a 1-lacticone oil composition in which 1 to 80% by weight of a hydrogenated thermoplastic resin having an aromatic ring is blended into the traction oil composition. Furthermore, the present invention
The base oil is a naphthenic base oil] - indicates laxicone oil, aIA product.

The present invention is based on the discovery that blending a hydride of a thermoplastic phase/fat having an aromatic ring in a base oil has the extremely excellent effect of improving the viscosity index of 111 oil and increasing the traction coefficient. It is something. Hydrogenation of thermoplastic resins having aromatic rings is of great importance here. That is, a thermoplastic resin having a similar aromatic ring that is not hydrogenated not only does not have the effect of increasing the traction coefficient, but also does not dissolve in the base oil or gels. The thermoplastic resin having an aromatic ring of the hydride of such a thermoplastic resin having an aromatic ring to be blended refers to a thermoplastic resin having a phenyl group, a phenylene group, a benzyl group, a benzylene group, a styryl group, A thermoplastic resin containing an aromatic monocyclic group such as a styrene group, and a fused ring group such as an indenyl group, an indenylene group, a naphthyl group, a naphthylene group, a coumaronyl group, or a coumaronylene group, including but not limited to , styrene homopolymer, styrene-acrylonitrile copolymer, styrene-butadiene copolymer, styrene-butadiene-styrene block copolymer, styrene-isoprene copolymer, styrene-isobutyne copolymer, styrene-
Butadiene-acrylonitrile copolymer, styrene-butadiene-medyl methacrylate copolymer, styrene-
There are various thermoplastic resins such as indene copolymers, coumaron homopolymers, and coumaron-indene copolymers.

However, in the hydride of the thermoplastic resin having an aromatic ring, which is blended into the traction oil composition of the present invention, the thermoplastic resin having an aromatic ring has a phenylene group in the main chain, such as polyphenylene oxide. Resin is slightly less effective.

The hydrogenated product of a thermoplastic resin containing an aromatic ring as described on page 507 in the traction oil composition of the present invention can be obtained by hydrogenating the thermoplastic resin containing an aromatic ring as described above. This hydrogenation reaction is carried out, for example, by introducing hydrogen into a thermoplastic resin having an aromatic ring as described above dissolved in a small amount of base oil in the presence of a hydrogenation catalyst.
Preferred hydrogenation catalysts are platinum, palladium, rhodium, ruthenium, and nickel catalysts, and in the case of nickel catalysts, the amount used is in the range of 0.1 to 20% by weight. Hydrogen pressure is 10-200 kO/cm2 G
is appropriate. Hydrogenation reaction temperature is 100° to 450°C,
Preferably it is 150-350°C. The reaction is stopped when the desired hydrogenation rate is obtained, but the reaction time is usually about 0.5
~20 hours.

It is desirable that the hydride of the thermoplastic resin having an aromatic ring obtained in this manner has a hydrogenation rate of 30 to 100%, preferably 50 to 100%. That is, if the hydrogenation rate is less than 30%, the effect of increasing the traction coefficient of the traction oil composition is insufficient, and the composition exhibits undesirable properties such as not dissolving in the base oil or gelling.

The hydrogenated thermoplastic resin having an aromatic ring is usually blended in an amount of 1 to 80% by weight, preferably 5 to 50 mm-%, in the 1- to lachoconyl composition of the present invention. In other words, if it is less than 1% by weight, it may be insufficient to increase the traction coefficient of the traction oil;
This is because if it exceeds a certain percentage, the viscosity of the traction oil composition may increase to a level unsuitable for use as a traction oil, and the oxidation stability may decrease.

The base oil used in the lubricant oil composition of the present invention refers to a known lubricating oil used as a traction drive lubricating oil, and may be any of them. The minimum conditions for these A1 crushed oils for traction are a kinematic viscosity of 1 to 150 cst at 40°C.
The base oil used in the traction oil composition of the present invention may be any base oil that satisfies these conditions, and naphthenic base oils are particularly preferred.

The naphthenic base oil used in the 1-vaccine oil composition of the present invention broadly means an alicyclic compound,
Any compound known as a lubricating oil may be used, including, but not limited to, docyclohexyls, dicyclohexylalkanes, tercyclohexyls, (cyclohexylalkyl)vinclohexyls, etc. , dos(cyclohexylalkyl)cyclohexyl, etc., hydrogenated biphenyls or derivatives thereof having a structure similar to these, hydrogenated diphenylalkanes or derivatives thereof, hydrogenated terphenyls or derivatives thereof, Hydrogenated (phenylalkyl)biphenyls (+NL) and their M conductors, hydrogenated bis(phenylalkyl)benzenes and their H conductors, etc., as well as naphthenic mineral oils, alkylcyclohexanes such as dodecylcyclohexane, etc. In addition, in the above compound,
When the six-membered ring has an alkyl group, the alkyl group has 1 to 5 carbon atoms, and the number of alkyl groups is preferably an integer of 1 to 3. Further, when an alkylene group is present between the six-membered carbon rings, the alkylene group is preferably a straight chain or branched alkylene group having 1 to 3 carbon atoms.

The horn oil composition of the present invention is made by blending a hydride of a thermoplastic resin having an aromatic ring with a naphthene base oil. other than,
The properties required for general lubricating oils include oxidation stability, corrosion resistance, abrasion resistance, rust prevention properties, rubber swelling properties, and antifoaming properties, and appropriate additives must be added according to each application. Is required. These additives may now be added to the composition according to the invention, such as alkylphenols such as 2,6-ditertiary-butylvalacresol as antioxidants,
It is possible to add sulfur and phosphorus compounds such as zinc dialkyldithiophosphate, amines, esters, and metal salts as rust preventive agents, polymethacrylates as viscosity index improvers, and silicone polymers as antifoaming agents. It is possible.

Next, the traction oil composition of the present invention will be explained in more detail with reference to Examples.

Examples 1 to 12 The resin shown in Table 1 was dissolved in bicyclohexyl or naphthenic mineral oil, and 5-10% by weight of Ni-diatomaceous earth catalyst (N-113 manufactured by Nikki Chemical Co., Ltd.) was added as a catalyst.
H2 pressure to 100! +/cm2・G.

The reaction was carried out at a reaction temperature of 200 to 250°C for 3 to 12 hours to obtain a hydride. The hydrogenation rate of the hydride was investigated using NMR, and it was as shown in Table 1.The obtained hydride was dissolved in a base oil of bicyclohexyl or naphthenic mineral oil at the solution concentration shown in Table 1, and the composition of the traction oil was determined. I prepared something. The physical properties of the obtained traction oil are shown in Table 1. In addition, the traction coefficient μmax of the obtained horn oil compositions 1 to 2 was measured using a cylindrical friction tester at room temperature, load 100 kg, constant speed side cylinder circumferential speed 45C1ll/S, variable speed side cylinder circumferential speed 44 to 63C.
Measurement was performed 5 to 6 times under conditions of +n/s, and the average value was determined. The results obtained are shown in Table 1.

Comparative Examples 1 to 2 Table 1 shows the traction coefficient μmax of the bicyclohexyl and naphthenic mineral oils used in Examples 1 to 12, determined in the same manner as in Example 1.

(The following is a blank space) Effects of the Invention As described above, the present invention is a traction oil composition comprising a base oil containing a hydrogenated thermoplastic resin having an aromatic ring. It has a very high traction coefficient, maintains fluidity suitable for a traction oil, and exhibits a high viscosity index, so it exhibits excellent performance as a traction oil used in traction drive devices. It is possible. Furthermore, the hydrogenation rate of the hydride of the thermoplastic resin having an aromatic ring is 30 to 100.
%, the performance as a traction oil of 1 m of 1 to 1 m of lactation oil becomes more excellent, and especially the hydrogen When the compound is blended in an amount of 1 to 70% by weight, the traction composition becomes excellent in various performances such as oxidation stability, corrosion resistance, abrasion resistance, and shear stability, and has a high 1-luxion coefficient and a high viscosity index. .

Claims (4)

[Claims] (1) A traction oil composition with an increased traction coefficient, which is obtained by blending a hydrogenated thermoplastic resin having an aromatic ring into a base oil. (2) The traction oil composition according to claim 1, wherein the hydrogenation rate of the hydride of the thermoplastic resin having an aromatic ring is 30 to 100%. (3) The traction oil composition according to claim 1 or 2, wherein 1 to 80% by weight of a hydride of a thermoplastic resin having an aromatic ring is blended in the traction oil composition. (4) The traction oil composition according to any one of claims 1 to 3, wherein the base oil is a naphthenic base oil.