Rubber powder is a powder material made by crushing waste rubber products by mechanical means, which has the elasticity of rubber and can be re-added to the production of rubber products, reducing the cost of raw materials while improving the processing performance of rubber materials, and improving the wear resistance and fatigue resistance of products. In actual production, the particle size, hardness, filler content in the rubber powder, the amount of rubber powder added and the interaction among the rubber powder and the rubber matrix will affect the physical mechanical properties of vulcanized rubber.
After different varieties of rubber are mixed with rubber powder, the physical and mechanical properties of vulcanized rubber change differently.
1. Changes in the physical properties of vulcanized rubber after rubber powder is added to rubber powder with low strength
Nitrile rubber, butadiene rubber and other rubber with low strength add ordinary vulcanized rubber powder, modified rubber powder, etc., the mechanical properties of vulcanized rubber will not deteriorate, and the modified activated rubber powder can play a reinforcing role in low-strength vulcanized rubber E4LYY115. For example, if about 20 parts of modified tire rubber powder are added to nitrile rubber, the tensile strength and tear strength of nitrile rubber vulcanized rubber are significantly improved, and the elongation at break is basically unchanged; After the vulcanized rubber powder is modified, the interface among the rubber powder and the nitrile rubber matrix is improved, and the physical performance of the vulcanized rubber is significantly improved.
2. Changes in the physical properties of vulcanized rubber after adding rubber powder to rubber with high strength
The addition of rubber powder to self-reinforcing rubber with high strength such as natural rubber will lead to the decline of the mechanical properties of vulcanized rubber; Surface modification or activation of rubber powder can improve the interface among it and the rubber matrix, thereby improving the mechanical properties of vulcanized rubber. For example, the activation of tire rubber powder through the solid-phase force chemical reactor can improve the interface compatibility among the waste tire rubber powder and the NR matrix, and achieve the reinforcing effect.
In actual production, the amount of rubber powder is controlled below 50 parts, and the tensile strength, tear strength and tensile elongation of vulcanized rubber are basically the same as those of carbon black-filled natural rubber vulcanized rubber with the same content. Therefore, many manufacturers of natural rubber products will use rubber powder to replace carbon black in whole or in part to reduce costs. The activation and modification of rubber powder by physical or chemical methods can improve the interface among the waste rubber phase and the rubber matrix phase in the vulcanized rubber filled with rubber powder, and improve the physical and mechanical properties of vulcanized rubber.
3. Common application examples and functions of rubber products filling rubber powder
(1) Automobile tire tread: Mixed with about 10-20 parts of ultra-fine rubber powder, it can improve the wear resistance, tear resistance and fatigue resistance of vulcanized rubber, reduce the dynamic heat generation of tires, and improve the mileage of tires.
(2) Rubber sole: Rubber powder can be used as a low-activity filler in the rubber outsole and midsole of various shoe materials, and the dosage is controlled among 10-80 parts, so as to reduce costs, improve the process performance of rubber materials, and reduce the shrinkage rate of rubber materials.
After the rubber powder is mixed in rubber products, the elasticity, tensile strength, wear resistance and other physical properties of vulcanized rubber will change, and rubber product manufacturers need to determine the optimal mixing ratio of rubber powder according to these performance changes, so as to further reduce the cost of raw materials under the premise of ensuring the quality of finished products.
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