Styrene-butadiene rubber is an elastomer formed by the catalytic copolymerization of butadiene and styrene monomer in emulsion or solution. It is the largest general synthetic rubber variety. It can be used alone or in combination with natural rubber, and it is more common to use it in combination with natural rubber. So in actual production, why many rubber product manufacturers choose to blend natural rubber into styrene butadiene rubber products, and what should be paid attention to during the blending process? Apart from natural rubber, is there any other rubber that can achieve the same effect?
1. Natural rubber improves the viscosity and elasticity of styrene butadiene rubber
Styrene-butadiene rubber has many internal trans-structures, irregular structures, and benzene ring structures on the side groups, so the rubber has low elasticity, slightly poorer cold resistance, and inferior adhesive properties to natural rubber. Adding an appropriate amount of natural rubber 2LLYY86 to the formula of styrene-butadiene rubber products can just improve the self-adhesiveness and elasticity of the rubber compound, and further improve the comprehensive performance of styrene-butadiene rubber products.
2. Natural rubber improves the strength of styrene butadiene rubber products
The pure styrene-butadiene rubber has low mechanical strength, and it can only meet the needs of rubber products by adding reinforcing fillers during use; however, in actual production, the compounding agent has poor dispersibility in styrene-butadiene rubber. Natural rubber is a self-reinforcing rubber with high green strength, and some rubber products can even be produced without a reinforcing agent. Natural rubber has good compatibility with styrene-butadiene rubber. When mixed with styrene-butadiene rubber, it can significantly increase the tensile strength and tear strength of styrene-butadiene rubber products, and improve the physical properties of rubber products.
3. Natural rubber improves the extrusion performance of SBR
The extrusion section of styrene-butadiene rubber has a large expansion rate and large deformation. It is easy to cause a rapid temperature rise during the extrusion process. The plasticity of the rubber compound is low, and the surface of the semi-finished product is relatively rough. The extrusion process is difficult. Natural rubber is easy to be extruded, with fast extruding speed and small deformation. The extruded semi-finished product has a smooth surface, dense interior and high dimensional stability. Mixing natural rubber in the formula of rubber products with styrene-butadiene rubber as the main raw material can improve the extrusion performance of styrene-butadiene rubber, reduce heat generation, reduce deformation, and improve the smoothness of the product surface.
Blending a certain proportion of natural rubber into styrene-butadiene rubber products can significantly improve the defects of styrene-butadiene rubber itself, and improve the production process and physical properties of styrene-butadiene rubber products. However, in actual production, the high price and price fluctuations of natural rubber are obvious to all. Therefore, when necessary, rubber product manufacturers can also use appropriate amounts of reclaimed rubber in styrene butadiene rubber products, such as latex reclaimed rubber (closer to natural rubber performance), tires Reclaimed rubber (good compatibility and low price) can improve the overall performance of styrene butadiene rubber products while reducing costs.
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