JPS5883036A - Thermoplastic composition - Google Patents

Abstract

PURPOSE:To provide the titled compsn. excellent in appearance and tensile and tearing strength, by kneading an asphalt matrix comprising asphalt and a thermoplastic resin, with vulcanized rubber powder, mineral powder, and short fiber. CONSTITUTION:Vulcanized rubber powder of a particle size about 10 mesh (e.g., used tire), mineral powder (e.g., CaCO3), and short fiber (e.g., nylon fiber) are blended with an asphalt matirx comprising asphalt and a thermoplastic resin (e.g., ethylene/vinyl acetate copolymer) and kneaded together. USE:Sound insulator, interior decoration, cushioning material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermoplastic composition suitable for use in bell-ringing materials, interior materials, acid roofing materials, and the like.

Conventionally, this type of thermoplastic composition has been made from vulcanized rubber fabric [for example, by crushing vulcanized rubber fabric from old tires, etc., and converting it into asphalt made of asphalt and thermoplastic resin. The following methods are known in which mineral powder is kneaded into a matrix.

In this way, by kneading the vulcanized rubber powder (+- mineral powder) with the asphalt matrix, the required mass can be secured by the chain material powder, a sound effect can be obtained, and the presence of the vulcanized rubber powder can be reduced. Appropriate tensile strength and tear strength are provided below, and the above-mentioned trace material is used.

It is said that it can be used as an interior material with a certain degree of maturity, and that it is effective when used as a sedimentary material for the collection of waste materials.

However, in the case of kneading such waxed rubber powder, the vulcanized rubber powder itself becomes granular foreign matter in the material, so that when the amount of the vulcanized rubber initial ice is increased, the composition The tensile strength and strength characteristics of the object deteriorate,
Furthermore, since the powder particles of the vulcanized rubber are noticeable on the surface of the composition, there is a problem in that the appearance becomes unsightly.

Here, as a means to increase the amount of vulcanized rubber powder without changing the strength characteristics of the composition, it is possible to reduce the amount of mineral powder added, but this would reduce the mass of the composition and improve the sound insulation properties. It will damage. In other words, this mineral powder exists as a foreign substance together with the vulcanized rubber powder in the composition, but a certain amount is indispensable in order to obtain sound insulation properties. While reducing the amount of rubber fabric can increase the amount of rubber cloth material to be processed, it ends up impairing the quality of the composition as a sound material or interior material.

The present invention has been developed in response to the conventional situation.

The object of the present invention is to obtain a thermoplastic composition that has excellent tear strength and WL properties and has an elegant appearance.

Therefore, in the present invention, by kneading an asphalt matrix made of asphalt and a thermoplastic resin, vulcanized rubber powder, mineral powder, and short fibers, the short fibers become entangled within the composition, resulting in tensile strength. , the tensile IiM laxity is increased, and # short fibers are formed on the surface of the composition to improve the appearance quality.

As short fibers, not only natural fibers such as cotton and hemp, but also chemical fibers such as nylon and acrylic fibers can be used.

Vulcanized rubber powder, mineral 3j@
By adding the staple fibers to the asphalt matrix and kneading them, the short fibers are incorporated into the composition in various ways, thereby increasing the tensile strength and tear strength of the composition.

The short fibers not only improve the strength properties of the composition, but also improve the appearance quality because the short fibers are exposed on the surface of the composition and can decorate the surface of the composition with a natural fiber pattern. be.

Furthermore, by incorporating these short fibers, the stickiness of the asphalt matrix can be reduced, which has the advantage of improving kneading workability.

Experimental example: 100 parts by weight of asphalt matrix (asphalt/lvm=6°/40), 100 parts by weight of mirrored rubber powder mainly composed of 1i10m7" grains, sop as short fibers
% based on the weight of polyamide fibers mainly composed of
Charcoal Calcicum (OaOO,) 1k1 as mineral powder
80 parts by weight, 1 part of 26011j, and Asphalt Matrix Co., Ltd. heavy lid part (asphalt/l V-20/40), 100 parts by weight of vulcanized rubber powder mainly consisting of particle size 1o mesh, m fiber. as (fund)
Calcium carbonate (OaOOl) 12 parts as mineral powder to 201 parts of polyamide short fibers mainly composed of fibers.
20 parts by weight and 140 dishes were kneaded using heated rollers and cooled using temperature-controlled cooling rollers to obtain a sheet-like thermoplastic composition, and its 'F6-conductive properties were determined. fIjjl was determined according to JI8 K53Ql.

In addition, as a comparative IIR example, the short fibers were removed from each of the above-mentioned formulation examples, and the composition was made in the same manner as before, and its normal state characteristics were measured in the same manner, and the fCC future first indication was 9. The numbers in parentheses at the bottom of the formula do not change depending on the tilt.

As is clear from Table 1, the tensile strength and tear strength are higher even when short fibers are added. If Shikine is added, the amount of vulcanized rubber powder added can be increased, and the rubber cloth material can be treated effectively. Moreover, in terms of appearance, the composition containing short fibers does not have a fiber surface.
As a wedge, I can understand how the appearance product award can be improved. Furthermore, products with added short fibers do not stick to the rollers during kneading, making it easy to work! 11. Because it can improve

Claims (1)

[Claims] (1) A thermoplastic composition obtained by kneading an asphalt matrix consisting of asphalt, a thermoplastic resin, and a vulcanized rubber powder, a noble powder, and short fibers.