JPS61275357A - Thermoplastic resin composition - Google Patents

Abstract

PURPOSE:To provide the title compsn. which gives moldings which have excellent mechanical strength, dimensional accuracy and sliding properties and low hardness and do not flaw metal by friction, consisting of a thermoplastic resin, a potassium titanate fiber and silicone oil. CONSTITUTION:2-50pts.wt. potassium titanate fiber (e.g. K2O.6TiO2 fiber) having an average fiber length of 10-20mu and a fiber diameter of 0.2-0.8mu (whose surface is optionally treated with a coupling agent such as aminosilane or epoxysilane) and 0.3-6 pts.wt. silicone oil (e.g. polyalkylsiloxane) having a viscosity of 100-30,000cSt are blended with 100pts.wt. thermoplastic resin such as styrene resin, modified PPO resin or ethylene/propylene resin.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is a mixture of a thermoplastic resin, potassium titanate fibers and silicone oil, which is a thermoplastic resin with excellent mechanical properties, dimensional accuracy and slidability of molded products. The present invention relates to a plastic resin composition.

(Prior art) In order to improve the mechanical strength of thermoplastic resins,
It is well known that blending glass fiber can significantly improve tensile strength, bending strength, heat resistance, etc. (Hiroshi Murayama, Basics and Applications of FRTP, (August 1, 1982),
Rubber Digest, P188).

Further, this resin composition is widely used in, for example, chassis of weak parts, coolers, etc. On the other hand, glass fiber-reinforced resin compositions cause warpage and poor appearance of molded products, so inorganic fillers such as mica and glass peas are sometimes used as fillers in the field of molded products where this is averse.

However, since these are not fibrous fillers for the resin, they have the disadvantage that they have a very low mechanical strength reinforcing effect compared to glass fiber reinforced resin compositions.

(Problems to be Solved by the Invention) However, as a fibrous inorganic photonic agent that improves these drawbacks, it improves mechanical properties such as tensile strength, bending strength, and flexural modulus, and also overcomes the drawbacks of glass fiber. Potassium titanate fiber is a typical material that minimizes the adhesiveness and poor appearance of molded products. Thermoplastic resin compositions containing potassium titanate fibers do not have improved mechanical properties compared to glass fiber-reinforced resin compositions, but they do have better mechanical properties than blended resins, and the appearance of molded products is improved. A certain surface property becomes very good. 1 Publication No. 58-216032, JP-A No. 58-198560
(Japanese Patent Application Laid-Open No. 58-76416, etc.).

On the other hand, various methods for improving the sliding properties of thermoplastic resins have been studied. Examples include adding a small amount of lubricating oil such as silicone oil to a thermoplastic resin, adding a layered crystal filler such as molybdenum disulfide or graphite, and adding a small amount of fluororesin (Akira Yamaguchi, ``Lubricity of Plastic Materials'' (1981, 5.30), Nikkan Kogyo Shimbun, p.20). Among these, it is well known to improve sliding properties by blending silicone oil with thermoplastic resin, but silicone oil alone is not effective in improving mechanical strength and dimensional accuracy.

Furthermore, if the amount of silicone oil blended is too large, the extrusion properties with the extruder will be poor, and the molded product surface will be excessively deleted, causing stickiness and reduced sliding properties.

The present invention solves these drawbacks, and by blending a thermoplastic resin, potassium titanate fiber, and silicone oil in a specific ratio, the mechanical properties as a molded product are improved.
It is an object of the present invention to provide a thermoplastic resin composition that has good dimensional accuracy and appearance, and has excellent sliding properties.

(Means for Solving the Problems) That is, the present invention consists of 100 parts by weight of thermoplastic resin, 2 to 50 parts by weight of potassium titanate fibers, and 0.0 parts by weight of silicone oil.
It is characterized by consisting of 6 to 6 parts.

The thermoplastic resin used in the present invention is a styrene resin such as styrene resin, rubber-modified styrene copolymer resin, styrene-acrylonitrile copolymer resin (As resin), and styrene-acrylonitrile-butadiene copolymer resin (ABS resin). , non-quality resins such as modified PPO resins,
Crystalline resins such as acetal resins, amide resins, ethylene resins, propylene resins and ethylene-propylene resins are preferred, and non-grade resins are preferred, and styrene resins and modified PPO resins are more preferred.

Further, the potassium titanate fiber used in the present invention is, for example, potassium 6-tethane and potassium hexa-titanate hydrate represented by [Formula 1] and [Formula 2], p1 average fiber length 10 to 20 μm1 fiber diameter 0 The thickness is preferably from .2 to 0.8 μm, and preferably the potassium titanate fiber of [Formula 1] has good compatibility with the resin. Further, it is more preferable to use a surface treatment with a coupling agent such as aminone, epoxysilane, or the like.

K2O.6r:1o2C Formula 1] K2O.6Ti02.l/2H20 [Formula 2] The blending ratio of potassium titanate fiber is 2 to 50 parts by weight, more preferably 3 to 40 parts by weight per 100 parts by weight of thermoplastic resin. Parts by weight. If the blending ratio is less than 2 parts by weight, the effect of addition will not be achieved, and if it exceeds 50 parts by weight, the impact strength will decrease, the dispersion of the potassium titanate fibers will be poor, and the surface of the molded product will become poor, which is not preferable.

Next, the silicone oil used in the present invention is, for example, polyalkylsiloxane/polyarylsiloxane,
The viscosity is preferably in the range of 100 to 30,000 cs.

The blending ratio of silicone oil is 100% thermoplastic resin! The amount is 0.6 to 6 parts by weight, preferably 0.6 to 6 parts by weight.
The amount is 6 to 3 parts by weight. If the blending ratio is less than 0.6 parts by weight, the sliding effect of adding silicone oil cannot be observed, and 6
If the amount exceeds 1 part by weight, delamination may occur in the molded product, which is undesirable.

The composition of the thermoplastic resin, potassium titanate fiber, and silicone oil of the present invention can be manufactured in conventional pantry mixer, coneater, roll and extrusion methods.

Further, the resin composition of the present invention may contain colorants, lubricants, plasticizers, antistatic agents, etc. without any problem.

The thermoplastic resin composition of the present invention can be used, for example, in the paper holder 9 part of a typewriter to provide a very good surface 9 part.
You can demonstrate your sexuality.

(Example) The present invention will be explained in detail below with reference to Examples.

Examples 1 to 6, Comparative Examples 1 to 5 ABS resin (Denki Kagaku Kogyo ■, trade name Denka ABS, GR-2000) and modified PPO resin (Engineering Plastic ■, trade name Noryl 75L) were used as resins, and titanium was used as the resin. Mixing and melt extrusion of acid potassium fiber M (Otsuka Chemical ■, trade name Sheis L, D-101) and silicone oil (Shin-Etsu Chemical ■, trade name Shin-Etsu Silicone KF-96) were carried out as shown in the table. Raw material pellets were obtained.

A test piece was prepared using this pellet, and physical properties were measured.

As a result, the present invention has excellent mechanical strength, dimensional stability, and sliding properties, and in particular, the sliding properties are sufficient even if the amount of silicone oil is reduced by half due to the synergistic effect of the combination of potassium titanate fiber and silicone oil. represents gender.

The physical properties of Examples and Comparative Examples were measured as follows.

1) Tensile strength: ASTM D-6382) Bending strength: AsTu D-7906) Flexural modulus: A
STM D-7904) Coefficient of linear expansion: Sample size 70 x 100 mm plate (n = 2)'fc-20 ~ Measurements were made while varying the temperature within a range of +60°0.

5) Dynamic friction coefficient: manufactured by Kyowa Interface Science, PFDM-RD type, sample size φ100 mm x wall thickness 2 mvt (n=
2) at room temperature at 600 times/min, φδ1@
Dynamic friction was measured using a ball under a load of 20I.

(Effects of the Invention) As explained above, the present invention is a resin composition in which potassium titanate fibers and silicone oil are mixed, and it is possible to obtain molded products with excellent mechanical strength, dimensional accuracy, and slidability. It has a lower hardness (Mohs hardness 4.0) than glass fibers and glass beads, so it has the characteristic of not causing friction scratches on metal.

Patent Applicant Denki Kagaku Kogyo Co., Ltd. Procedural Amendment July 4, 1985 Director of the Patent Office Michibe Uga 1, Indication of Case 1985 Patent Application No. 116513 2 Name of Invention Thermoplastic Resin Composition 6 , Relationship with the case of the person making the amendment Patent applicant address 1-4-1 Yurakucho, Chiyoda-ku, Tokyo, Column 5 of the detailed description of the invention in the specification, Contents of the amendment Page 6, line 8 of the specification Correct "pantry" to "panbari".゛

Claims (1)

[Claims] Thermoplastic resin 100 parts by weight, potassium titanate fiber 2~
A thermoplastic resin composition comprising 50 parts by weight and 0.3 to 6 parts by weight of silicone oil.