Styrene-butadiene copolymer chemical foaming composition containing polystyrene micro-blocks, preparation method and application method thereof

Abstract

The invention discloses a styrene-butadiene copolymer chemical foaming composition containing polystyrene micro-blocks, a preparation method and an application method thereof. The preparation method takes styrene-butadiene copolymer mixing random structure with block structure as base material, and adds flow modifier or softener to regulate the fluidity of rubber. Rubber compositions manufactured by the method have good fluidity and can be molded directly through injection. Chemical foaming agents added reduces product density and effectively achieves the aim of obtaining lightweight material. Post partial chemical crosslinking can be performed so as to improve the stress cracking resistance and wear resistance of the material. Meanwhile, as the partial physical crosslinking of the styrene-butadiene copolymer allows the material to overcome the defect that all-chemical crosslinked rubber cannot be regenerated, the material can be recycled and regenerated.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a styrene-butadiene copolymer composition, a preparation method and an application method. 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, in the preparation of shoe soles, adhesives, commodity elastomers, modified 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 foaming agents) and the physi...

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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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