Styrene-butadiene rubber is a kind of synthetic rubber prepared by the copolymerization of butadiene and styrene, which has excellent wear resistance, heat resistance and aging resistance, and is widely used in tire manufacturing, auto parts, industrial seals, conveyor belts, rubber pipes and rubber products. In order to further improve the comprehensive performance and economic benefits of styrene-butadiene rubber products, many manufacturers began to mix reclaimed rubber and reclaimed rubber powder.
1. The basic concept and performance characteristics of reclaimed rubber and reclaimed rubber powder
(1) Reclaimed rubber is a waste vulcanized rubber through physical and chemical processes such as crushing, heating, mechanical and chemical treatment, which will change from an elastic state to a rubber variety with certain plasticity and viscosity that can be processed and vulcanized, with low price and many varieties, with good plasticity, small shrinkage, good fluidity, fast vulcanization speed, stable chemical properties, aging resistance and other characteristics. The use of reclaimed rubber in the production of rubber products with styrene-butadiene rubber as the main raw material can not only reduce the cost of raw materials, but also improve the processing performance of rubber compounds.
(2) Reclaimed rubber powder is a powdery substance with different particle sizes made of waste rubber as raw material, crushed or ground by mechanical processing, with simple production process and low price, which can be used in rubber products, building materials, road paving and other fields. The reasonable addition of reclaimed rubber powder to rubber products can not only reduce the cost of raw materials, but also improve the flexural crack resistance and crack growth resistance of rubber products, and improve the shrinkage and fluidity of rubber compounds.
2. Styrene-butadiene rubber products are mixed with reclaimed rubber and reclaimed rubber powder formula adjustment skills
In actual production, styrene-butadiene rubber is mixed with an appropriate proportion of reclaimed rubber and reclaimed rubber powder, and the mixing ratio is reasonably controlled, which can not only reduce costs, but also improve the physical and mechanical properties of rubber and the processing process. For example, adding an appropriate amount of rubber powder to styrene-butadiene rubber can improve the wear resistance and tear resistance of the rubber, and generally about 30-100 parts of reclaimed rubber powder can be added to 100 parts of styrene-butadiene rubber.
When reclaimed rubber and reclaimed rubber powder are mixed in styrene-butadiene rubber, it is necessary to use appropriate compounding agents: adjust the dosage of vulcanizing agent (such as sulfur) and accelerator (such as accelerator CZ) in the formula to optimize the vulcanization performance of rubber compound; Appropriately increasing the dosage of accelerator can speed up the vulcanization speed and improve the production efficiency; Reasonably control the amount of sulfur E4LYY49 to ensure the degree of vulcanization and physical and mechanical properties of the rubber compound. Appropriately increasing the amount of reinforcing carbon black, such as high wear-resistant furnace black, can further improve the physical and mechanical properties of styrene-butadiene rubber.
Styrene-butadiene rubber can be mixed with reclaimed rubber and reclaimed rubber powder, which can improve the performance of rubber products through reasonable formula design and process adjustment, including reducing production costs, improving product market competitiveness and manufacturers' economic benefits.
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