JPS61190553A - Lubricant resin composition - Google Patents

Abstract

PURPOSE:To obtain the titled composition of outstanding sliding characteristics, also with high heat resistance and mechanical strength, suitable for sliding parts for use in electronic and electrical apparatus etc., by incorporating specific polycyanoaryl ether with each specific amount of fluororesin and carbon fiber. CONSTITUTION:The objective composition can be obtained by incorporating (A) 40-94wt% of a polycyanoaryl ether containing >=50mol% of recurring unit of formula (Ar is -C6H4-, etc.), with such a molecular weight as to give >=0.44l/g in the reduced viscosity with (B) 3-40(pref. 5-30)wt% of fluororesin [e.g., tetrafluoroethylene(co)polymer] and (C)3-40(pref. 10-20)wt% of carbon fiber with an aspect ratio 20-500 and fiber length 0.1-10mm.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a lubricating resin composition, and more specifically, a lubricating resin composition having excellent sliding properties, heat resistance, and Ja mechanical strength. Regarding.

[Technical Background of the Invention and Problems Therein] Generally, sliding parts such as bearings, gears, and cams are often used as component parts in electronic/electronic equipment and machines. The materials for these sliding parts are required to have properties such as high mechanical strength and good heat resistance in addition to good sliding properties, and metals have traditionally been used, but in recent years metals have become lighter. Plastic materials have come to be widely used due to their characteristics such as high productivity.

By the way, as a plastic material, it is heat resistant.

Polycyanoaryl ether is known to have excellent mechanical strength, but when this polycyanoaryl ether is used alone as a constituent material of the above-mentioned sliding parts, it itself has sufficient self-lubricating properties. Because it is not done properly, sufficient sliding characteristics cannot be obtained.

In addition, with the aim of improving sliding properties, materials made by blending polycyanoaryl ether with a fluororesin with a low coefficient of friction show improved sliding properties, but on the other hand, mechanical strength decreases at high temperatures. This results in the problem of inviting

[Object of the Invention] The object of the present invention is to solve the above-mentioned problems and provide a lubricating resin composition having excellent sliding properties and excellent heat resistance and mechanical strength.

[Summary of the invention] The lubricating resin composition of the present invention.

40 to 94% by weight of polycyanoaryl ether containing 50 mol% or more of repeating units represented by the following formula: ), 3 to 40% by weight of fluororesin, and 3 to 40% by weight of carbon fiber. %.

First, the polycyanoaryl ether, which is the first component in the present invention, contains 50 mol% or more of repeating units represented by the above formula (I).

The content of repeating units represented by formula (I) is 50 mol%
If it is less than 9, the heat resistance 9 and mechanical strength of the resulting resin composition will decrease.

Moreover, the polycyanoaryl ether used in the present invention has, in addition to the repeating unit represented by the formula (■).

50 mol% of at least one repeating unit represented by the following formula: (wherein Ar' represents an aryl group different from the 7-aryl group in formula (1))
A copolymer containing the following may be used.

Ar' in the formula (II) is: H3 If the copolymer component of the repeating unit represented by the formula (■) exceeds 50 mol %, the mechanical strength of the resin composition decreases.

The polycyanoaryl ether in the present invention has a reduced viscosity [ηsp/cl] of 0.21/dJL at 80°C when the polycyanoaryl ether is dissolved in P-chlorophenol to a concentration of 0.21/dJL. 4
It has a molecular weight of dJL /g or more. If the degree of polymerization is such that the reduced viscosity [η sp/cl is 0.4 dJL/g turbidity, this polycyanoaryl ether molded product will not exhibit sufficient mechanical strength, which is not preferred.

The polycyanoaryl ether described above is produced as follows.

In other words, it is made divalent with dihalogenobenzonitrile, reacted at a predetermined temperature, and then treated with water or alcohol.

In addition, when making polycyanoaryl ether into a copolymer, two or more types of dihydric phenols are used.

The above-mentioned polycyanoaryl ether is blended in an amount of 40 to 34% by weight in the lubricating resin composition of the present invention. If the amount is less than 40% by weight, mechanical strength and heat resistance will decrease, and if it exceeds 34% by weight, the sliding properties will be insufficient.

Next, the second component, the fluororesin, contributes to improving the sliding properties in the composition of the present invention, and its type is not particularly limited. Copolymer of ethylene fluoride and propylene hexafluoride, copolymer of ethylene tetrafluoride and perfluoroalkyl vinyl ether, trifluorochloroethylene polymer, 7
-Vinylidene dichloride polymer, etc. can be mentioned.

Each of these fluororesins may be used alone, or two
More than one species may be used in appropriate combination.

Among these, tetrafluoroethylene polymer is preferred.

The blending amount of the fluororesin is 3 to 40fi%, preferably 5 to 40%.
It is 30% by weight. If the amount is less than 3% by weight, the sliding properties will be poor, and if it exceeds 40% by weight, the mechanical strength and heat resistance will be reduced.

The third component, carbon fiber, is a component that contributes to improving the sliding properties of the composition of the present invention and also contributes to improving the heat resistance.9 The carbon fiber used in the present invention is acrylonitrile.

Any carbon fiber may be used as long as it uses pitch, cellulose, etc. as a starting material, and the spectral ratio of the fiber at the time of blending is 20 to 500, preferably 100 to 350.
The fiber length is preferably 0.1-10 mm, preferably 3-6 mm.

The amount of carbon fiber blended is 3 to 40% by weight, preferably 10 to 2% by weight.
It is 0% by weight. If the blending amount is 3% by weight without swirling, the sliding properties will be poor, and if it exceeds 40% by weight, the molding operation will be difficult.

In addition to the three components mentioned above, ordinary lubricants such as molybdenum disulfide and graphite may also be added.

Stabilizer 9 Additives such as colorants, fillers, antioxidants, and ultraviolet absorbers may be added as necessary.

In order to obtain the resin composition of the present invention, for example, predetermined amounts of the above-mentioned polycyanoaryl ether, fluororesin, and carbon fiber are mixed in, for example, a Henschel mixer or a ribbon blender. For example, after tri-blending using a mixer such as a tumbler.

- Melt kneading and pelletizing in a screw or multi-screw extruder.

Injection molding may be used to mold, for example, bearings using the obtained pellets.

[Example 1 of the invention Examples 1 to 3 As a polycyanoaryl ether, it consists of 0M and uses p-chlorophenol as a solvent.
Reduced viscosity at 80°C of a solution with /dll concentration [ηs
p/cl is 1.45 dJ1/g, and the fluororesin is tetrafluoroethylene polymer (manufactured by Imperial Chemical Industries: Fluon@Li).
O2) was used. Further, as the carbon fiber, carbon fiber (manufactured by Toshishi ■: Trading Card) having a thread diameter of 9 mm, an average fiber length of 3 mm, and an aspect ratio of 250 was used. These raw materials are supplied to a Henschel mixer and mixed so that the composition ratio shown in the table is obtained, and then a two-wheeled extruder is used to transfer the raw materials to a cylinder temperature of 380~380°C.
After kneading and extruding at 330°C, the mixture was pelletized. Test pieces were molded from the blended pellets thus obtained, and the tensile properties, heat distortion temperature (HOT), coefficient of dynamic friction, and coefficient of wear were measured. The results are shown in the table. The dynamic friction coefficient and wear coefficient were measured using stainless steel 45C as the mating material, with a sliding load of 20 kg/ad, and a sliding liquid per hour IQs/w.
Under the condition of in.

The test was carried out using a thrust type abrasion tester (Toyo Seiki Sosakusho M).

Examples 4 to 6 As a polycyanoaryl ether, the reduced viscosity at 30°C of a solution with a concentration of 0.2 g/dll using 0 M pyrrolidone as a solvent [ηsp/cl is 1.31 d
Lubricating resin compositions were produced in the same manner as in Examples 1 to 3, except that one having a value of JL/g was used, and the physical properties were measured in the same manner.

Examples 7 to 9 As a polycyanoaryl ether, the reduced viscosity measured at 80°C of a solution with a concentration of 0.2 g/dJL using 0M phenol as a solvent [ηsp/cl is 1.15
Examples 1 to 3 except that cHL/g was used.
A lubricating resin composition was produced in the same manner as above, and measurements were conducted in the same manner.

[Effects of the Invention] As is clear from the examples of the invention, the resin composition of the invention has excellent sliding properties.

Moreover, since it has excellent heat resistance and mechanical strength, it is effective when applied as a material for sliding parts of electronic and electrical equipment and machinery, and its industrial value is great.

Claims (1)

[Claims] The following formula: ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, Ar is ▲There are mathematical formulas, chemical formulas, tables, etc.▼,
▲There are mathematical formulas, chemical formulas, tables, etc.▼, ▲Mathematical formulas, chemical formulas,
There are tables, etc. ▼ Represents one of the following. ) A lubricity characterized by comprising 40 to 94% by weight of polycyanoaryl ether containing 50% by mole or more of repeating units represented by the formula, 3 to 40% by weight of fluororesin, and 3 to 40% by weight of carbon fiber. Resin composition.