Foamable rubber particles

Abstract

The invention discloses foamable rubber particles which comprise a rubber composition and rubber ingredients, wherein the rubber composition consists of polychloroprene, standard natural rubber, EVA (ethylene vinyl acetate copolymer), POE (polyolefin elastomer), ethylene propylene ternary gel or nitrile rubber; the rubber ingredients consist of filler, a fortifier, a disperser, a modifying flowable agent, a foaming agent and a vulcanizer. After the rubber composition and the rubber ingredients, which are prepared according to proportion, are prepared into the foamable rubber particles through fusion granulation, the rubber particles are heated and pressured by any one of stand type injection molding machine to form turbulent state rubber, the turbulent state rubber is injected into a mould cavity, the turbulent state rubber in the mould cavity is vulcanized, and the rubber particles are vulcanized and foamed, so that the weight of the foamed rubber product can be reduced and the elasticity of the foamed rubber product can be improved under the condition that the other physical properties are invariable.

Description

technical field [0001] The invention relates to a foamable rubber particle, in particular to a foamable and vulcanizable rubber composition which can be stored at room temperature for a long time and made into rubber particles, belonging to the technical field of high molecular polymers. Background technique [0002] Rubber has a wide range of applications, from being indispensable to aerospace, precision instruments, and general machinery, to people's daily necessities of life. It is well known that rubber is inseparable from its presence. With the wide application range of rubber products and the increasing demand, the original natural rubber is far from being able to meet the continuous expansion of its demand in the development of industrial society. Due to the development of the ethylene industry, scientists have continuously created products such as nitrile rubber, styrene-butadiene rubber, neoprene rubber, butadiene rubber, isoprene rubber, and EPDM according to the ...

AI Technical Summary

Problems solved by technology

The traditional method of making rubber products, due to the poor fluidity and high molecular weight of various rubber materials, can only be molded and vulcanized by heating the mold.

This kind of molding process first needs to combine rubber materials and various additives through a rubber mixer to make what is commonly known as "raw rubber" and fill the mold cavity after cutting. Compared with injection molding, there must be a lot of leftovers and defective products. It not only increases the cost of the product, but also seriously pollutes the environment. The first defect is that the "raw rubber" filled in the mold cavity must be heated and vulcanized to become the commonly known "cooked rubber", and the heating of the mold requires an expensive heat source to generate and conduct Equipment, equipment investment is large, energy consumption is high, and its defect two; Due to the high molecular weight of rubber, the molecular entanglement is serious, resulting in a large amount of heat generated by the rubber raw material during the kneading or banburying process, and the heat is not easy to spread, so that the rubber material It is easy to partially vulcanize, which can easily lead to product defects after vulcanization molding. The third defect is that the traditional process of sulfur vulcanization is used, and the fused rubber is prone to self-vulcanization when the ambient temperature is slightly high, so the fused rubber cannot be kept at room temperature for a long time. Preservation, its defect four

However, this rubber composition adopts a relatively simple styrene-based thermoplastic elastomer, and this type of elastomer only maintains mechanical properties through physical crosslinking points, which cannot meet the high performance requirements of some products. Rubber, PE recycled materials, EVA recycled materials, PP recycled materials, etc. are used as performance supplements, but due to the complex composition of recycled materials, the physical properties of the products are uncontrollable, which still cannot meet the physical index requirements of high-end products. The rubber raw materials, vulcanization process and the rubber composition invented before cannot be foamed and vulcanized into molding, resulting in high specific gravity of the product and high production cost. The elasticity of the product is limited and cannot meet the requirements of light weight, soft texture and high elasticity. defect two