JPS6181492A - Lubricant oil for transmission - Google Patents

Abstract

PURPOSE:The titled novel-type lubricant oil that is obtained by using a naphthenic hydrocarbons bearing carbon 6-membered rings such as hydrogenated (benzylphenyl)phenylethane, thus showing excellent traction properties, high stability to oxidation and corrosion-proofing properties. CONSTITUTION:The objective lubricant oil is produced by using a naphthenic hydrocarbon bearing at least one carbon 6-membered rings of 21-22 carbon atoms, namely hydrogenated (benzylphenyl)phenylethane (bearing methyl group bonding to carbon 6-membered rings) such as hydrogenated 1,1-(benzylphenyl) phenylehane, hydrogenated 1,1-(benzylphenyl)(methylphenyl)ethane or hydrogenated phenethylbenzylbenzene. USE:A lubricant for traction drive.

Description

[Detailed description of the invention] The present invention relates to a lubricating oil for a power transmission device.

To be more specific, this relates particularly to lubricating oil used in Traxicon drives.

Conventionally, gear devices and hydraulic devices have been used to transmit or change the speed of moving horns, but a drive system called Traxicon Drive (rolling II friction drive device) that uses point contact or line contact between rotating rigid bodies is also known. Because it does not involve the meshing of gears, there are few images taken during operation, and it has high power transmission efficiency, it is beginning to be put into practical use in some production machines.

In this case, the lubricating oil that is most suitable from a functional standpoint must be selected as the oil present in the contact parts of the device. In other words, the oil present in the contact area has the property of reversibly undergoing a glass transition under high pressure and increasing its viscosity, which has a large power transmission effect at the rotating contact surface, and immediately returns to a fluid state when it leaves the contact surface. The lubricant must have the same properties as general lubricants, prevent direct contact between metal objects, prevent seizure, wear and fatigue loss, and have important effects such as rust prevention and cooling similar to general lubricants. No.

IIIE for power transmission? Alternatively, traction drive devices are described in many prior technical documents, such as U.S. Pat.
11.369 Tanmei t (I Zhan, V-Nal of Chemical and Engineering Data Vol. 5, No. 4, pp. 499-507, Proceedings of Symposium on Rolling Contact Phenomenon of Huco et al. No. 157-185 For details, see page [Nilsepia Publishing House (Amsterdam), 1962].

In addition, as lubricating oil for traction drives, mineral oil (Japanese Patent Publication No. 39-24.635), mixed oil of dialkyl aromatic hydrocarbon and diallyl alkane (Japanese Patent Publication No. 47-40.5)
No. 25), polymethyl methacrylate (Special Publication No. 1973-3)
1.828), pivalic acid monoester (Special Publication No. 1.828)
-11.309), halogenated alkylnaphthalene (
Special Publication No. 49-16.900) Adamantane (Special Publication No. 48-42.067 and No. 48-42,068)
, polyolefins (Fr. No. 46-4,766 and No. 47-2.229), alkyl phthalenes (U.S. Pat. No. 2,549,377), 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. 48-29.7154), dicyclohexylpropane (Section II (753-36, 10
No. 5), 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), 2
Naphthene (
U.S. Pat. No. 3,925,211), mixed oil of naphthene and paraffin (U.S. Pat. No. 3,595,796 and U.S. Pat. No. 3,595,797), and the like. Also, JP-A-5
No. 5-43,108 summarizes and introduces these prior art techniques, and then hydrogenates the alkylation reaction product of xylene and/or toluene with styrene to produce 1q.
It is said that the substances (mainly hydrogenated 1,1-diallylethane compounds) are present even in naphthenic oils.

However, although the above-mentioned U.S. Pat.
Most of them are compounds having 1 to 2 hydrogenated rings, and examples of compounds having 3 or more hydrogenated rings include 1,2.3-tricyclohexylpropane, tricyclohexylmethane, etc. I'm just doing it.

From these prior art documents, naphthenic oils containing hydrogenated rings are used as lubricating oils, especially r9 for traction drives.
It can be seen that it generally has excellent properties as a lubricating oil. However, what about FF7? The fact that many similar patents have been filed and each patent has been granted indicates that even though naphthenic oils are generally effective, their performance as traction drive lubricants varies depending on the type. This means that many compounds have been discovered that exhibit unexpected performance.

Therefore, an object of the present invention is to provide a novel lubricating oil for power transmission devices. Other objects of the invention are traxin properties as well as oxidative stability.

The object of the present invention is to provide a lubricating oil for power transmission 41 that not only has excellent properties such as corrosion resistance but also can be easily synthesized using industrially inexpensive raw materials.

These various names are hydrogenated (benzylphenyl)phenylethane or hydrogenated (benzylphenyl)phenylethane having a methyl group bonded to a six-membered carbon ring,
This is achieved by a lubricating oil for a power transmission device that uses a naphthenic hydrocarbon compound having at least one hydrogenated carbon six-membered ring having 21 to 22 carbon atoms.

From its molecular structure, naphthenic hydrocarbon oil has a skeleton in which three six-membered hydrogenated carbon rings are linked linearly through one methylene group and one ethylene group. , which have been found to be specifically effective for the purposes of the present invention.

Examples of compounds used in the n-lubricant oil for power transmission devices of the present invention include hydrogenated 1. L (Benzylphenyl)phenylethane, hydrogenated 1.1-((methylbenzyl)phenyl)phenylethane, hydrogenated 1.1- (benzylphenyl)(medylphenyl)ethane, hydrogenated 1.1-
Examples include (benzylmethylphenyl)phenylethane, hydrogenated phenethylbenzylbenzene, and hydrogenated phenethylbenzyltoluene.

These compounds, for example, can be hydrogenated (benzylphenyl) by reacting diphenylethane with a benzyl halide in the presence of a Friedelkraff catalyst to hydrogenate (benzylphenyl) phenylethane. 1q of phenylethane type compound is obtained. in this case,
As diphenylethane, if 1 portion of 1.1-diphenylethane is used, a hydrogenated 1.1-(benzylphenyl)phenylethane type compound is obtained;
．． If 1-diphenylethane or methyl-substituted benzyl halide is used, alkyl iP5! Hydrogenation 1,
A compound of the 1-(benzylphenyl)phenylethane type is obtained. If 1,2-diphenylethane is used as diphenylethane, a hydrogenated 1,2-(benzylphenyl)phenylethane type compound can be obtained.

The lubricating oil for power transmission devices according to the present invention uses at least one type of naphthenic hydrocarbon compound having three hydrogenated six-membered carbon rings, and has a viscosity of 14 knots. There is no problem in adding mineral oil, other naphthenic oil, etc. to the agent, modifier, diluent, etc. In particular, the general formula [(wherein R1 is an alkylene group having 1 to 3 carbon atoms, R3, R4, and R5 are alkyl groups having 1 to 4 carbon atoms, and fi, Ill, and n are integers of O to 3) Because of its excellent properties, the compound represented by .

General ceremony! Compounds represented by include hydrogen (hibenzylbiphenyl, hydrogenated benzylethyl biphenylated (ethyl biphenylyl) phenylethane, etc.).
Among these, hydrogenated benzylbiphenyl or one or two methyl or ethyl substituted products thereof are preferred.

A compound represented by the general formula (2), for example, a Gf alkyl-substituted or unsubstituted hydrogenated benzylbiphenylalkyl-substituted or unsubstituted benzyl halide and an alkyl-substituted or unsubstituted biphenyl are reacted in the presence of a Friedel-Craf catalyst. By hydrogenating the resulting alkyl-substituted or unsubstituted benzyl biphenyl in the presence of a hydrogenation catalyst, such as a nickel catalyst. Purchased or non-purchased cyclohexylbenzene or phenyl and alkyl exchanged or JI
tFJ is carried out by reacting E-substituted styrene in the presence of a free sol fluorine catalyst such as concentrated sulfuric acid and hydrogenating the resulting reaction product.

It goes without saying that it also contains 1q of additives such as antioxidants, corrosion inhibitors, rust preventives, and antifoaming agents. Furthermore, there is no problem in the presence of a small amount of by-products generated during the process of producing tFJ of the naphthenic hydrocarbon compound having three hydrogenated carbon six rings. However, since it is undesirable for aromatic hydrocarbons or compounds having double bonds to exist in large numbers, the corresponding aromatic hydrocarbons are hydrogenated to produce the naphthenic hydrocarbon compound and the general formula 1.
When producing a compound represented by , the hydrogenation rate is at least 80%, preferably 90% or more, and more preferably 95% or more. Not only is it difficult to almost completely eliminate aromatic hydrocarbons or compounds having double bonds to less than 1%, but even a small amount will not impede the purpose of the present invention, so such necessity is not required. There isn't.

The traction coefficient is generally measured using a traction drive device, but in the present invention, the Soda type cylindrical friction test 1! Aircraft A was used. Traction (rolling friction) occurs at three contact points between the central cylinder and three cylinders placed outside, and the same vertical load acts on the contact points. The surface pressure at this time is 0.575 to 1.1 57G in terms of average Hertzian pressure.
It is Pa. Other conditions are as shown in Table 1.

Table 1 Traction experiment conditions Rotational speedfff 1.05-4.19m/S Sliding speed 0-0. 22m/s test piece cylinder
Material Bearing steel 5UJ-2 hardness HV
760-800 dimension outer cylinder 401I
IIIllX9IIIIII inner tube 40+mX5
mm (diameter x width) Lubrication method Dripping method Flow hanging Approximately 10111Q/min
Supply oil lagoon As a means of operation for the 28℃ experiment, first, the rotational speed of both the inner and outer cylinders was kept constant, and after applying a load, the slip rate was increased by increasing only the rotation speed of the outer cylinder, and the friction torque or , the change in traction coefficient was continuously determined. Friction torque was measured by directly measuring the torsional moment of the central free support shaft using a resistance wire strain gauge.

The traction coefficient measured under these conditions shows a tendency to first rise linearly as the slip rate increases, then reach a maximum and then decline. In this case, the region that is particularly important from a practical standpoint is the initial linear region where the heat generated by shearing the oil film is not large, and the traction coefficient in this region is particularly targeted.

As an example, the traction coefficient measured at an average Hertz pressure of 1.157 GPa and a rotational speed of 4.19 m/s is as follows: Naphthenic mineral oil 00OS polyisobutylene hydride 0.06 dicyclohexane 0.065 dicyclohexylethane 0,075 α-methylstyrene linear The compound according to the present invention reaches a value of 0.09 or more, which is extremely superior to these hydrocarbons, and is superior to α-methylstyrene, which is currently commercially available as a synthetic traction fluid. It has become clear that the dimeric hydride is no better.

In addition to the above-mentioned traction properties, the performance required for lubricating oils for traction drives includes oxidation stability, viscosity index improvement, corrosion resistance, S abrasion resistance, and 1 navigation stop that are required for general lubricating oils. properties, rubber swelling properties, anti-foaming properties, etc., and it is necessary to mix appropriate additives according to each use. Here, the compounds according to the invention may be supplemented with these additives, such as alkylphenols such as 2,6-ditertiary-butylvalacresol as antioxidants, sulfur compounds such as zinc dialkyldithiophosphate, phosphorus compounds,
It is possible to add amines, esters, metal salts as rust preventive agents, polymethacrylates as viscosity index improvers, and silicone polymers as antifoaming agents.

Next, the present invention will be explained in more detail by giving Examples. In addition, "part" in the following examples is based on lff1 unless otherwise specified.

Example 1 0.001 to 0.005 mol of 4g aluminum was added to 4 mol of 1.1-diphenylethane, heated to 60°C, and then 1 mol of benzyl chloride was added and reacted for 20 minutes. Then, after washing the reaction product with water to remove the catalyst,
Unreacted substances were separated by distillation. 1q was reduced 1,1-(
Benzyl phenyl) phenylethane (isomer mixture) was fed into an autoclave and heated using a nickel catalyst at an initial hydrogen pressure of 100 kg/C112G and a temperature of 140 to 170°C.
Hydrogenated 1.1-(benzylphenyl)phenylethane (isomer mixture) was obtained by carrying out a hydrogenation reaction for hours. The film properties of this product were as shown in Table 2.

A traction drive lubricating oil was prepared by adding 0.5% by weight each of 2,6-ditertiary-butylvalacresol and zinc dialkyldithiophosphate as antioxidants to the hydrogenated 1.1-(benzylphenyl)phenylethane. did. The traction coefficient of this lubricant was measured under the conditions described above and J [5K2514-1
Table 3 shows the results of an oxidation test performed according to the procedure described in Section 3.2 (Lubricating oil oxidation stability test method for internal combustion IMRgJ) of 980 (Lubricating oil oxidation stability test method). For comparison, similar tests were conducted on commercially available lubricating oils for traction drives based on α-methylstyrene linear dimeric hydrogen compounds and lubricating oils prepared from naphthenic mineral oils.

Note that the oxidation test conditions are as follows.

Test hanging 300I112 temperature
Temperature: 165.5℃ Time: 72 hours Oxidation Catalyst: Copper and iron Example 2: 1 ton of methyldiphenylmethane and 20 liters of concentrated acid in the reactor
011ffi was supplied and maintained at 150°C. Then, 800 Il of a mixture of 1 part methyldiphenylmethane was added dropwise over a period of 2 to 3 hours, during which time the temperature of the reaction solution was maintained at 15 to 20°C. After finishing dropping, ll++! f[1200I11, was added and the reaction was continued for 30 minutes. The reaction product was then washed repeatedly with water to remove the acid, and then distilled to obtain monomethyl-substituted 1.1-(benzylphenyl)phenylethane. The mixture was then hydrogenated in the same manner as in Example 1 to obtain hydrogenated monomethyl-substituted 1.1-(benzylphenyl)phenylethane. The film properties of this product were as shown in Table 2. In addition, the traction coefficient of RA oil for traction drives prepared by adding the same additives as in Example 1 was measured and JIS K251
Table 3 shows the results of an oxidation test according to Section 3.2 of 4-1980.

(Margin below)

Claims (2)

[Claims] (1) Hydrogenated (benzylphenyl)phenylethane or hydrogenated (benzylphenyl)phenylethane having a methyl group bonded to a six-membered carbon ring, and having a carbon number of 21
A lubricating oil for a power transmission device, which comprises using a naphthenic hydrocarbon compound having at least one hydrogenated six-membered carbon ring having a molecular weight of 1 to 22. (2) The lubricating oil according to claim 1, wherein the lubricating oil is a traction drive lubricating oil.