JPS59202260A - Lubricating resin composition - Google Patents

Abstract

PURPOSE:To improve sliding characteristics such as self-lubricating properties, wear resistance, etc., by blending a fluororesin and an arom. polyamide resin with a polyarylene ether sulfone. CONSTITUTION:3-60pts.wt. fluororesin and 3-60pts.wt. arom. polyamide resin are blended with 100pts.wt. polyacrylene ether sulfone. Examples of the polyarylene ether sulfones are those having repeating units of formulas I and II. When the quantity of the fluororesin exceeds 60pts.wt., the mechanical properties and the moldability of the resulting resin compsn. are deteriorated, while when the quantity is less than 3pts.wt., an effect of improving self-lubricating properties is insufficient. When the quantity of the arom. polyamide resin exceeds 60pts.wt., the mechanical characteristics and moldability are deteriorated, while when the quantity is less than 3pts.wt., an effect of improving the wear resistance is insufficient.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin composition that is suitable for sliding members having excellent self-lubricating properties and wear resistance, and which is based on carbon.

Thermoplastic polyarylene ether sulfone is a relatively new heat-resistant resin useful as a so-called engineering plastic that has outstanding thermal properties and heat resistance, as well as excellent mechanical and electrical properties. Moreover, it has relatively excellent wear resistance, so it is expected to be applied to various sliding members.

However, thermoplastic polyarylene ether sulfone alone is not yet sufficient for use in sliding members in terms of self-lubricating properties and wear resistance.

In general, solid lubricants such as graphite and molybdenum disulfide are added as a measure to improve the sliding properties such as self-lubricity and wear resistance of resins for sliding members (for example, Japanese Patent Application Laid-Open No. 13-13). Blends of resins with a low coefficient of friction such as fluorinated ethylene resin (PTFE) (for example, JP-A-Sho!; jt-7
Blends of lubricating oils such as mineral oils, animal and vegetable oils, or waxes and metal soaps (e.g., Tokko Shogu Otsu-!;, 3.2/No. 3 Publication, Tokko Shogeta-q) Otsul
There are methods such as No. S Publication), but even if these methods are applied, sliding '4! It is hard to say that J-character will be fundamentally improved.

Products containing solid lubricants improve surface J load resistance, but
There has been little improvement in the number of self-excused cases.

Blends of resins with low coefficients of friction, such as PTFE, have a considerable effect on improving self-lubricating properties, but on the other hand, they do not reduce the mechanical strength and load bearing capacity of molded products. Also, the wear resistance is not sufficient. Furthermore, even in the case where a lubricant is dispersed and contained, the oil-impregnating property may have an adverse effect and cause intoxication when used by adhering or adhering to other objects.

The present inventors conducted extensive studies on improving the sliding properties of thermoplastic polyarylene ether sulfone, and found that by blending aromatic polyamide fibers with fluororesin, sliding properties such as self-lubricating properties and abrasion resistance were significantly improved. The present invention has been achieved based on the discovery of improvements.

The lubricating resin composition of the present invention contains (a) based on 100 parts by weight of thermoplastic polyarylene ether sulfone.

fO) 3 to Aθ parts by weight of fluororesin and (c) 3 to 60 parts by weight of aromatic polyamide fiber.

The polyarylene ether snotphone (aromatic polysulfone) used in the present invention is a linear polymer composed of a combination of three essential bond units: an arylene bond (aromatic bond), an ether bond, and a sulfone bond. For example, a typical example is one with the following structural formula.

Example: Manufactured by ICI, product name VICT 几EXI'-PESJ
Example: Manufactured by UCC. Product name: I'Ude1. Example: Manufactured by 3M.
Product Name: "A, 5trelJ"
It can be easily produced by the methods described in Japanese Patent Publication No. 7799, Japanese Patent Publication No. 7-Otsu/7, etc., and at least one kind or a mixture of two or more of these can be used.

In the present invention, it refers to a synthetic polymer containing a thermoplastic polyarylene ether sulfone atom (F), and generally has better heat resistance, chemical resistance, and electrical properties (especially high frequency properties) than other synthetic resins. Excellent and unique low friction properties,
It has non-adhesive properties. For example, typical examples include those consisting of the following specific structural formulas, and at least seven or a mixture of two or more of these may be used.

(1) +CF2CF2-)n: Polytetrafluoroethylene (PTFE) (2) (-CFzCIi"zCF(CF:+)CF
2-) n: Tetrafluoroethylene-hexafluoropropylene copolymer I+ fat (FDP) (3) + (CF20F2 CFCOR) CF2)-)
,,: Tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin (PFA) (41 (CF2CF2-CF(CF3)CF2-C
F(OR.) CF2-1-n: Tetrafluoroethylene-hexafluoropropylene-berfluoroalkyl vinyl ether resin (E J) E~) (However, R does not represent a fluorinated alkyl group Cn P 2 n +h. )+5+
(-CI-1zCHzCIi"2CFz: 3-: Tetrafluoroethylene = ethylene copolymer resin (ETF'E) (
6) (-CIT2CII2CFCICFz-)-
n: Trifluorochloroethylene resin (ECTI"E) [71゛(CFzCIIz-6 vinylidene difluoride resin (PV) F') (8) (-CPC/?CF2-) n: Polychlorotri Fluoroethylene (PCTPE) (!11 (-CIT2(j-rF+: polyvinyl fluoride (I) V F ) Tetrafluoroethylene resin (P T F E ), which is completely fluorinated among the above-mentioned fluororesins. These properties are particularly excellent and they are most preferably used in the present invention.The amount of these fluororesins added in the present invention is in the range of 3 to θ parts by weight per 7,700 parts by weight of the above-mentioned polyarylene ether sulfo.Fluororesins The amount of addition is 3
If the amount is less than 1 part by weight, the effect of improving the self-lubricity of the resulting resin composition will be undesirably reduced. Furthermore, if the amount of the fluororesin added is more than 6θ parts by weight, the resulting resin composition will have poor mechanical properties and moldability, which is not preferable. The preferred amount added is 70 to 0 parts by weight.

Furthermore, the aromatic polyamide used in combination in the present invention is a relatively newly developed heat-resistant resin, and is expected to be used in various fields by taking advantage of its many unique properties. Examples include those having the following structural formulas, and at least seven types or a mixture of two or more of these may be used.

Example) ) u Pont product name [Kev:Lar
J example) ])u Manufactured by Pont, product name: rNomex
"Manufactured by Teijin Co., Ltd. Product name [conex JOthers, aromatic polyamide resins with each Ui skeleton can be considered depending on the isomeric structure of ortho, meta, and para, but among them, the one with para-para bond (1) has a high softening point and try point. It is most preferably used in the present invention as a heat-resistant resin. The amount of aromatic polyamide IT resin added in the present invention is 3 parts by weight per 7100 parts by weight of the above-mentioned polyarylene ether sulfo.
~60 parts by weight. If the amount of aromatic polyamide 1 needle fat added is less than 3 parts by weight, the effect of improving the abrasion resistance of the resulting resin composition will be small, and if it is still larger than the amount added, the mechanical properties of the resin composition will be reduced. The properties and molding processability will be affected, making it undesirable. A preferable addition amount is 10-0 left side.

In addition, from the viewpoint of mechanical properties and moldability of the resulting resin composition, the total amount of the fluororesin and aromatic polyamide resin added is 100@, f
It is more preferable that the amount is 700 parts by weight or less based on part z.

The composition of the present invention may further include fibrous reinforcing agents (e.g., carbon fibers, glass fibers, etc.) within a range that does not impair the purpose of the present invention.
Particulate tougheners (e.g. calcium carbonate, clay, talc, silica, etc.), antioxidants and heat stabilizers, UV absorbers, lubricants and mold release agents (e.g. stearic acid and its salts, Nisdel, Hafestel, stearyl alcohol) Conventional additives such as colorants, dyes (e.g., nitrosine, etc.), as well as pigments (e.g., cadmium sulfide, talocyanin, carbon black, etc.) can be added to the seed plate. can.

In the present invention, the fluororesin and aromatic polyamide resin are uniformly mixed into the thermoplastic polyarylene ether sulfone, but there are no particular restrictions on the method of addition and mixing.
Various means can be employed. For example, they can each be supplied to the melt mixer separately, or they can be premixed using a Henschel mixer, ribbon blender, tumbler, etc. and then supplied to the melt mixer.

The lubricating resin composition of the present invention can be molded by injection molding or extrusion molding, which are highly productive molding methods, but other compression molding methods, sintering molding methods, etc. There is no harm in applying it.

Molded articles obtained by melt-molding the lubricating resin composition of the present invention have excellent sliding properties and can be used for many purposes. For example, various bearings, piston rings,
It can be usefully mixed and designed for gears, cams, hoppers, tweeters, various valve parts, various pump parts, sliders, etc. depending on the purpose.

EXAMPLES The present invention will be explained in further detail with reference to Examples below.

Examples/~g and Comparative Examples/~S I as thermoplastic polyarylene ether sulfone powder
PES λ00P1 manufactured by C1C1 fluororesin powder: 3 pieces of tetrafluoroethylene resin manufactured by Fluorochemical Company, trade name: Teflon PLP-10, aromatic polyamide fiber as aromatic polyamide resin, product evlar J manufactured by DuPont
After tri-blending with the composition listed in the table, a screw with a compression ratio of 3.0 is installed.17 Q mt
An extrusion operation was performed while melt-kneading using an n-time extruder (extrusion temperature: 370-3'IO'C) to obtain uniformly blended pellets.

Next, the above uniformly blended pellets were molded using a normal injection molding machine at a barrel temperature of 3 A O'C and a mold temperature of 30°C.
When molded test pieces were prepared under the temperature conditions of 1 and 2 and the sliding properties were measured, the results shown in Table 1 were obtained.

In addition, the friction coefficient assumes that the mating material is stainless steel, surface pressure / Oky / ”-, speed / Q on / se
It was measured at room temperature under the conditions of c using a Matsubara friction tester.

In addition, the wear coefficient is a surface pressure of 3 kg/m and a speed of 10θm/
Measurement was performed at room temperature using a cylindrical abrasion tester under the condition of min.

Examples 9 to 10 and Comparative Examples B to 7 In Example 1, instead of PBS, Polysulfone (trade name: Niederpolysulfone P-/7θ0 manufactured by Ichisan Kagaku Kogyo Co., Ltd.) was mixed in the amount shown in Table No. The results obtained by testing in the same manner as in Example are shown in Table No.

Claims (1)

[Claims] L ((+polyarylene ether sulfone 1oox
(b) 3 to 60 parts by weight of fluororesin and,
(c) A lubricating resin composition characterized by containing 3 to 60 parts by weight of an aromatic polyamide resin. 2. The composition according to claim 1, wherein the polyarylene ether sulfone has a repeating unit represented by the formula. The composition according to claim 1, wherein the polyarylene ether sulfo/ has a repeating unit represented by the formula.