JPS6291549A - Tetrafluoroethylene/propylene copolymer composition - Google Patents

Abstract

PURPOSE:To provide the titled compsn. which has excellent heat resistance, electrical characteristics and flame retardance, can be arbitrarily colored and is suitable for use as a coating material for lead wires for motors, wires for electronic appliances, consisting of a tetrafluoroethylene/propylene copolymer and zinc sulfide powder. CONSTITUTION:100pts.wt. tetrafluoroethylene/propylene copolymer is blended with 3-100pts.wt. zinc sulfide powder having a particle size of 100mu or below and a purity of 90% or above and optionally, 0.5-10pts.wt. crosslinking agent such as an org. peroxide (e.g., dicumyl peroxide), etc., and 0.1-10pts.wt. crosslinking aid (e.g., triallyl cyanurate).

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to expanding the uses of tetrafluoroethylene-propylene copolymers.

Conventional technology Tetrafluoroethylene/propylene copolymer.

Because it has good electrical properties and flexibility, and also has the heat resistance and flame retardancy characteristic of fluororesins.

It is suitably used as a covering material for Hiji wires for motors used in high-temperature environments (200°C), wiring for electronic devices, etc.

But the color of the polymer! iA? ! Because it is a color, it has poor color differentiation, and has the disadvantage that its range of use as a product is limited.

Problems to be Solved The object of the present invention is to improve the color discrimination of tetrafluoroethylene/propylene copolymers.

Means for Solving the Problems In order to achieve the above object, the present invention comprises a tetrafluoroethylene/propylene copolymer and 100 parts by weight of the polymer.
3 to 100 parts by weight of powdered zinc sulfide.

Effects Compositions containing zinc sulfide and tetrafluoroethylene propylene copolymer are white to milky white (zinc sulfide's color-dispersion improving effect), and therefore can be colored to any desired color by blending various pigments. It becomes possible to do so. Furthermore, zinc sulfide does not substantially possess the excellent heat resistance that tetrafluoroethylene/propylene copolymer has.

The powdered zinc sulfide used in the present invention is not particularly limited, but preferably has a particle size of 100 μm or less and a purity of 90% or more. The amount of zinc sulfide used is 3 to 100 parts by weight, preferably 5 to 50 parts by weight, per 100 parts by weight of the tetrafluoroethylene/propylene copolymer. 1 if less than 3 parts by weight
The effect of improving color discrimination is poor, and if the amount exceeds 100 parts by weight, problems will arise in the physical properties of the composition.

The compositions of the present invention include organic peroxides such as dicumyl peroxide, 2.5 dimethyl 2.5 ditertiary butyl peroxyhexane, 1.4 biester, butyl peroxyisobrobyl benzene, 1.3 bister Crosslinking can be performed using sheabutylperoxyisopropylbenzene or other suitable crosslinking agents. The amount of crosslinking agent used is 0.5 to 10 parts by weight, preferably 1 part by weight, per 100 parts by weight of the tetrafluoroethylene/propylene copolymer.
~5 parts by weight. During crosslinking, a crosslinking aid such as triallyl cyanurate, triallyl isocyanurate,
Allyl compounds such as diallyl phthalate, sulfur, maleimide, methacrylates, oximes, etc. are added in amounts of 0.1 to 100 parts by weight of the tetrafluoroethylene/propylene copolymer.
It is preferable to use 10 parts by weight.

The composition of the present invention may further contain various known additives to the extent normally used, if necessary. Calcium, silica, alumina, hydrated alumina.

Fillers such as hydrated magnesium, lubricants such as stearic acid and sodium stearate, and magnesium oxide.

These include acid acceptors such as calcium hydroxide, color pigments such as titanium oxide, phthalocyanine blue, and horse tin cooled, campling agents such as aluminum nathanate, and silane.

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples.

Examples 1 to 6, Comparative Examples 1 to 3 The compositions (parts by weight) of the Examples and Comparative Examples shown in the attached table were mixed using two rolls, and then heated to 170°C.

Press crosslinking was performed for 20 minutes to obtain a crosslinked sheet with a thickness of 2III.

The properties of each composition were evaluated in the following manner.

Color: The color of the composition mixed with the two rolls was visually observed. As a result, those exhibiting a white to cream color are indicated by a circle, and those in which the blackish brown color of the tetrafluoroethylene/propylene copolymer actually remains are indicated by an X.

Heat resistance: JISK 63 for the above crosslinked sheet
It was aged at 250° C. for 7 days according to the aging test method of 01 r Vulcanized Rubber Test Method, and the residual elongation rate after that was added by 1.

Tensile strength 2 For the above crosslinked sheet, JIS K
A tensile test was conducted according to 6301, and the value was 1.
+r/w to 0! Indicate the above with a circle.

1. Those below 0 kg/am" are marked with an x.

effect As mentioned above, the composition of the present invention is heat resistant.

It has excellent electrical properties and flame retardancy, and can be colored in any color, so it is suitable for use as a covering material for Hiji wires for motors used in high-temperature environments (200°C), wiring for T4 slave devices, etc. It is being

Claims (1)

[Claims] 1. A tetrafluoroethylene/propylene copolymer composition comprising a tetrafluoroethylene/propylene copolymer and 3 to 100 parts by weight of powdered zinc sulfide per 100 parts by weight of the polymer.