Star high styrene rubber and preparation method thereof

Abstract

The invention provides star high styrene rubber and a preparation method thereof, and the star high styrene rubber has a structural formula as follows: Y-[B1->S1-B2 / S2]4, wherein Y is Si or Sn; B1->S1 is polystyrene or polybutadiene tapered block copolymer; B2 / S2 is polystyrene or polybutadiene random copolymer; in the structural formula, the polystyrene or polybutadiene tapered block is 40-75wt%, and the mass fraction of the polystyrene or polybutadiene random copolymer is 25-60wt%; and in the star high styrene rubber copolymer, the styrene content is 45-75wt% and the butadiene content is 25-55wt%.The preparation method of the star high styrene rubber is as follows: adding an initiator once, adding monomers in a polymerization system at twice in a sequence, and then adding a coupler for coupling reaction after the polymerization to obtain the star high styrene rubber. The high styrene rubber in the invention has the characteristics of high hardness and good strength, can improve properties of rigidity, hardness and wearing resistance and lower contraction rate of the rubber products when being used with various synthesized rubber or natural rubber together, and can be widely usedin shoemaking industry, tyre industry, printing industry and other industries.

Description

technical field [0001] The invention relates to a star-shaped copolymer and a preparation method thereof, in particular to a star-shaped high styrene rubber with high rigidity, high hardness and high wear resistance and a preparation method thereof. Background technique [0002] A copolymer composed of butadiene and styrene, if combined with a high styrene content, will obtain a resin copolymer with low elasticity and high plasticity; otherwise, a rubber-like copolymer with high elasticity and low plasticity will be obtained. Usually, the copolymer with styrene binding amount in the molecular structure between 45% and 70% is called high styrene rubber. The notable characteristics of high styrene rubber are its high hardness, good strength, and physical properties of rubber. When used in combination with various synthetic rubbers or natural rubbers, it can improve the rigidity, hardness, wear resistance, and reduce shrinkage of rubber products. It can be widely used in the s...

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Problems solved by technology

[0004] According to the search results, although there are many literatures and patents on the production of high-styrene rubber at home and abroad, most of them adopt latex coagulation technology. This process can obtain high-styrene rubber with better performance, but the main problem of this method is that : Firstly, in terms of technology, it is necessary to synthesize SBR-1500 or SBR-1502 latex and high-styrene resin emulsion respectively, and then mix the two emulsions that have passed the analysis in a certain proportion, and then obtain high-styrene rubber through coagulation and drying. The process flow is relatively long and requires two synthesis processes such as water phase, oil phase, initiator preparation and degassing; secondly, in terms of production cost, since the conversion rate of the synthetic SBR-1500 or SBR-1502 latex monomer is only 70%, there is no Reactive monomers account for 30%, and this part of monomers is difficult to recycle in small and medium-scale production devices, resulting in higher production costs and relatively more equipment, auxiliary materials, personnel, time, and energy required for the polymerization process; In terms of production cycle, since the synthesis temperature of high-styrene resin emulsion is high-temperature polymerization, there are many structural gels in the polymerization kettle, and the polymerization kettle used usually needs to be cleaned once for 10 batches of production, so the equipment utilization rate is low

The above-mentioned polymers all have the disadvantages that the tensile strength and hardness of the product are not high enough

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