JPS58179262A - Lubricating resin composition - Google Patents

Abstract

PURPOSE:To provide the titled composition suitable as a sliding parts having excellent self-lubricity and abrasion resistance, by compounding a thermoplastic polyether aromatic ketone with a fluorine-contained resin and carbon fibers. CONSTITUTION:The objective composition is prepared by compounding (A) 40- 90wt% of a thermoplastic polyether aromatic ketone with (B) 3-40wt% of a fluorine-contained resin (e.g. tetrafluoroethylene resin, vinylidene fluoride resin, etc.) and (C) 3-40wt% of carbon fibers preferably having a diameter of 8-15mu and an aspect ratio of 100-350. The sum of the components (A) and (B) is preferably >=70wt% to achieve the uniform melt mixing and improve the moldability of the composition.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a thermoplastic polyether aromatic ketone which, in addition to outstanding thermal properties and flame resistance, has excellent mechanical and electrical properties. It is a comparatively flexible heat-resistant resin that is useful as a so-called engineering plastic, and is expected to be applied to various sliding parts because it has excellent Lury and abrasion resistance.

However, thermoilic polyether aromatic ketone alone is not sufficient for use in sliding members in terms of self-lubricating properties and wear resistance.

Generally, as a measure to improve the sliding characteristics such as self-lubricity and wear resistance of resin for sliding members, a method of blending solid lubricants such as graphite and molybdenum disulfide (for example, JP-A-56-6
1458), tetrafluoroethylene resin (PTF)
A method of blending a resin having a low coefficient of friction such as (abbreviated as E) (for example, Japanese Patent Application Laid-Open No. 135163/1983)
, a method of dispersing lubricating oil such as mineral oil, animal or vegetable oil, wax or metal soap (e.g.
There are methods such as those disclosed in Japanese Patent Publication No. 5321 and Japanese Patent Publication No. 47-42615), but even if these methods are applied, it cannot be said that the sliding characteristics are fundamentally improved.

Although products containing Toki's solid lubricants can be expected to improve load carrying capacity, they can hardly be expected to improve self-digesting properties, and products containing resins with a low coefficient of friction such as PTFB cannot be expected to improve. Although a considerable effect can be expected in improving self-lubricating properties, the mechanical strength and load carrying capacity of the molded product are inevitably reduced, and the wear resistance is also insufficient. In addition, even when using lubricants with dispersed sound, their oil-impregnating properties can be a negative factor when used by adhering or adhering them to a musical object. .

The present inventors conducted intensive studies on improving the sliding properties of thermoplastic polyether aromatic ketone, and found that by blending carbon fiber with fluororesin, the sliding properties such as self-lubricity and abrasion resistance were significantly improved. The present invention has been developed based on this understanding.

That is, the present invention uses (a) thermoplastic polyether aromatic ketone of 40 to 90% by weight, (b) fluorine, and (b) fluorine. , and in some cases −('
It is a polymer obtained by polycondensation reaction of an activated aromatic cybaride in which a part of O- is replaced with 15O2-, for example, in the presence of an aromatic sulfone as a solvent. Typical examples include those having the following structural formula. However, “−φ−
" indicates a paraphenylene group.

(φ-0-φ-Co-φ-0-) (1) For example, ICI, trade name, pEEi< In addition to the repeating unit (1), the following repeating units can also be included.

壬φ−0−φ−8O2−φ−0−).

(In the formula, A is a direct bond, oxygen, sulfur, -5O2゜-
Represents CO- or a divalent hydrocarbon group, located in the to or b position of the plane, and Q and Ql are the same or different -C
o- or -5O2-, Ar is a divalent aromatic group, and m is 0.1.2 or 3. ) These thermoplastic polyether aromatic ketones are disclosed in, for example, JP-A-50-27897 and JP-A-51-1197.
No. 97, JP-A-52-38000, JP-A-Sho 5
It can be produced by the knob method described in Japanese Patent Publication No. 1401296, Japanese Patent Publication No. 55-23574, Japanese Patent Publication No. 56-2091, etc., and at least one type of these or a mixture of two of them is used.

The fluororesin used in combination with the thermoplastic polyether aromatic ketone in the present invention is a synthetic polymer containing fluorine atoms in its molecules, and generally has higher heat resistance than other synthetic resins. It has excellent chemical resistance, electrical properties, especially high frequency properties, and unique low friction and non-adhesive properties. For example, a typical row 5 has the following rough structural formula, and at least one type or a mixture of two of these 1- is used.

(1) 4CF□ ("l='2-): (1) TFE
)+1 (2) [,,(chotsuCL”r CF (CF3)CF
2 ``I n ''Polymer resin for tetrafluoroethylene-propylene (FEP) (3) ((("l", ('F2 gas CF[OR"l
cr"2B, :F-action resin (PFA) for tetrafluoroethylene-perfluoroalkyl vinyl ether (I (represents a fluoroalkyl group, CnF2n4-8) (4) ('-('ILcH2CF2CF2-)- n:
Tetrafluoroethylene-ethylene copolymer resin (ETFE) (5) ((T11., Cll2CFCdCF2+n:
Trifluorochloroethylene resin (ECTFE) (6) + C'F"2 CH2+, : Vinylidene fluoride resin (PVI) These properties are particularly excellent and they are most preferably used in the present invention.

Furthermore, the carbon fiber used in the present invention is a fibrous material obtained by carbonizing or graphitizing an organic substance such as rayon, polyacrylonitrile, or pitch as a starting material by heating in a special atmosphere. It can be used in a wide range of applications, from no-blade products with high strength and high elastic modulus to low-grade products with low strength and low elastic modulus.

Therefore, the carbon fiber used in the present invention has an appropriate diameter t and asparagus) it (r% diameter/'diameter U) ratio) in consideration of uniform mixing properties and the effect of improving sliding properties. It is preferable to select one that achieves /1. The diameter of the carbon fiber is usually 5 to 20tt1, especially 8 to 15μPμ. Also, the aspect ratio is 1 to 600.
A value of 100 to 350 is recommended, especially considering the uniform mixing properties and the physical and mechanical properties of the molded product.

If the aspect ratio is too small, it will be similar to the use of powdered or particulate carbon materials, and if the aspect ratio is too large, it will not be possible to mix uniformly or
There are problems with injection moldability as a ψ product, and it becomes difficult to obtain injection tip products with a smooth surface.

[Lubricating resin composition of the present invention] The components are (a) thermoplastic polyether': 40 to 90% hR group ketone, (b) fluororesin: ~40% needle weight (c) carbon fiber 3~ 40%
It is evenly combined within the range of .

In the set ++7 of the present invention, the various characteristics of (a) are utilized, the self-lubricating property is improved by using the composition of (b), and the wear resistance is improved by (c). However, if all of (a), (b), and (c) are less than the above range, the lubricant resin composite future of the present invention may be made to exhibit the respective characteristics. I can't do that,
In addition, if there is a large amount, the characteristics derived from the other two materials are insufficient and the present invention is not suitable. Preferably, the total amount of the thermoplastic polyether aromatic ketone and fluororesin is 70% by weight or more.
The mixing ratio of H is adopted. The amount of carbon fiber added is 3
When the amount is less than 0% by weight, it becomes difficult to uniformly melt and mix the composition, and the melt flowability is also significantly reduced, often resulting in impaired molding processability in injection molding and the like.

In addition, pigments, powder fillers, extenders, etc. may be used for the purpose of improving thermal stability, mechanical strength, self-lubricating property, surface strength, etc., and for coloring, as long as they do not impede the various effects of the present invention.
It is common practice to use a combination of various additives such as stabilizers, lubricants and lubricants.

In the present invention, the fluororesin and carbon fiber are uniformly mixed into the thermoplastic polyether aromatic ketone, but there is no particular restriction on the method of addition and mixing, and the divine means is one method.
1il・+! = −r−1,ru. For example, they can each be supplied to the melt mixer separately, or they can be premixed using a twist mixer, ribbon blender, tumbler, etc. and then supplied to the melt mixer. It is also possible to adopt a wet mixing method in which the material is dispersed in an aqueous medium or an organic medium.

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, Even if you apply the forming form method, you can't use it.

The lubricious resin phase of the present invention [obtained by melt-molding the mold] has excellent sliding properties and can be used in many applications. . For example, each f4 +
Il+ Receiving material, piston ring, gear, hopper, /
Niter, 4 pump parts each, slider, various valves>
It is possible to design a useful formulation depending on the specific product.

The present invention will be described in further detail below with reference to a practical example.

Examples 1 to 5 and Comparative Examples 1 to 2 Thermoplastic polyether aromatic ketone powder (manufactured by ICI,
Product name: PEEK), fluororesin powder (PTl'E),
Carbon fibers (manufactured by Toshi Co., Ltd., trade name: Torayca) having an average diameter of 12μ, a thickness of 3 mm, and an aspect ratio of 250 and molybdenum disulfide, a solid lubricant, were triblended with the composition shown in Table 1, and then compressed. 40 mm extruder equipped with a screw ratio of 3.07'1 (extrusion temperature 330-39
An extrusion operation was performed while melt-kneading at 0° C.) to obtain a uniformly blended pellet.

Next, using a normal injection molding machine, molded test pieces were made from the uniformly mixed pellets at a barrel temperature of 370°C and a mold temperature of 120°C, and the sliding properties were measured. The results shown in Table 1 were obtained. Obtained.

The physical property measurement results show that the composition of this example is extremely excellent as a sliding member having a significantly small coefficient of friction and wear.

Claims (1)

[Claims] City ht ratio, (a) thermoplastic polyether aromatic ketone 40-909%, (b) fluororesin 3-40% and (
...) A lubricating resin composition consisting of 3 to 40% carbon fiber.