Physical foaming ethane-butadiene rubber composite capable of being injected and crosslinked, as well as preparation method, product and processing method thereof

Abstract

The invention relates to a physical foaming ethane-butadiene rubber composite capable of being injected and crosslinked, as well as a preparation method, a product and a processing method thereof. The physical foaming ethane-butadiene rubber composite capable of being injected and crosslinked mainly comprises a styrene-butadiene copolymer, a flow modifier, a softener, a vulcanizer, a vulcanizing accelerator and a physical foaming agent and is prepared by the following steps of: firstly, putting the styrene-butadiene copolymer, the flow modifier and the softener in proportion in a banburying mixer for banburying; secondly, adding the vulcanizer, the vulcanizing accelerator and the physical foaming agent and mixing; thirdly, extruding rubber material by using an extruder for pelleting; and finally, obtaining the foaming product with the density of 0.5-1.0(g / mc3). By the technical scheme, the physical foaming ethane-butadiene rubber composite capable of being injected and crosslinked, as well as the preparation method, the product and the processing method thereof are provided.

Description

technical field [0001] The invention relates to an injectable cross-linkable physically foamed styrene-butadiene rubber composition, a preparation method thereof, a product obtained and a processing method thereof. Background technique [0002] As we all know, styrene / butadiene block copolymer (SBS) is the earliest industrialized styrene monomer-based thermoplastic elastomer. SBS can be used, for example, to make shoe soles, adhesives and elastomers for household use, and to modify bitumen and plastics. The largest application field of SBS is shoe soles, and SBS for shoe soles accounts for more than 50% of the world's SBS consumption. [0003] Lightweight SBS shoe materials have always been the development direction of SBS shoe materials, and foaming is the most effective means of lightweight shoe materials. At present, the lightweight of SBS shoe materials mainly focuses on the chemical foaming of gas generated by the decomposition of chemical foaming agents (such as AC f...

AI Technical Summary

Problems solved by technology

[0006] Due to the above defects of SBS foam shoe material, the sole made of SBS has high density and poor wear resistance. Therefore, it has been gradually replaced by other foamable lightweight materials such as EVA and polyurethane (PU) in recent years.

[0007] The tensile strength, tear strength, compression set, wear resistance, and anti-slip properties of EVA foam products currently used are more plastic properties, which cannot fully meet the requirements of the shoe industry.

Although polyurethane has excellent wear resistance, there are also disadvantages in polyurethane foaming materials for shoe soles, such as high investment in thermosetting polyurethane equipment, high toxicity of polyurethane monomer, and complicated foaming process, etc.

The basic materials used in this patent are styrene-butadiene rubber, natural rubber and butadiene rubber. The molecular weight of these materials is too large, resulting in high melt viscosity of the material, which cannot be processed by injection

At the same time, the patent adopts sulfur vulcanization system, the vulcanization temperature is low, and crosslinking is easy to occur in the screw of the injection machine, and this formula system cannot be processed by injection.

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