The vulcanized rubber powder made of waste rubber products by mechanical, frozen crushing and other methods has good elasticity and reinforcing properties, which can be re-added to the production of automobile tires, reducing the cost of raw materials and improving the comprehensive performance of tires. For example, about 10 parts of tire rubber powder in tire tread rubber can significantly improve the mileage of tires. When mixing vulcanized rubber powder with automobile tires, the following issues need to be considered.
1. Varieties of vulcanized rubber powder
According to the source of waste rubber, vulcanized rubber powder can be divided into tire rubber powder, nitrile rubber powder, ethylene propylene rubber powder, butyl rubber powder, etc., and the performance characteristics of different varieties of rubber powder are different. When vulcanized rubber powder is mixed with automobile tires, it is necessary to select appropriate varieties of rubber powder according to the specific use needs of different parts of the tire, such as wear resistance and aging resistance; Rubber powders commonly used in tire processing are tire rubber powder, butyl rubber powder, etc.
2. The quality and fineness of vulcanized rubber powder
The quality of vulcanized rubber powder directly affects the performance of tires. Key indicators to measure the quality of rubber powder include heat reduction, ash content, acetone extract, rubber hydrocarbon content, carbon black content, iron content, fiber content, tensile strength E4LYY613 and elongation at break. Vulcanized rubber powder may contain impurities such as fibers, metals, ash and moisture, which can affect the physical and mechanical properties of automobile tires. The high-quality rubber powder has high fineness, high rubber hydrocarbon content, no impurities, low ash content, and no agglomeration of fibers.
The higher the fineness of vulcanized rubber powder, the better the mixing effect in tires, which can improve the tear strength and process operability of the rubber compound. For example, the tread rubber of automobile tires is mixed with fine rubber powder of 80 mesh and above, and the tread rubber has ideal flexural crack resistance and crack resistance and crack resistance; Improve the fluidity of the tread through the mouth shape during extrusion and the flexibility of the semi-finished rubber compound after extrusion, and reduce the shrinkage rate of the tread during storage.
3. The effect of vulcanized rubber powder on the performance of automobile tires
(1) Abrasion resistance and tear resistance: Mixing an appropriate amount of vulcanized rubber powder can improve the wear resistance and tear resistance of tires.
(2) Dynamic heat generation: The addition of ultra-fine rubber powder can reduce the dynamic heat generation of tires and improve mileage.
(3) Physical and mechanical properties: The addition of vulcanized rubber powder may reduce the physical and mechanical properties of vulcanized rubber, so it is necessary to strictly control the mixing ratio.
4. Vulcanized rubber powder mixing ratio
When vulcanized rubber powder is mixed with automobile tires, the amount of rubber powder needs to be adjusted according to the specific formula and production process. For example, 5-20 parts of tire powder can be mixed with tire crown rubber, and about 15 parts of vulcanized butyl rubber powder can be mixed with sidewall rubber. The appropriate use of vulcanized rubber powder in automobile tires can effectively reduce the cost of raw materials.
5. Adjust the formula appropriately
Automobile tires need to be properly adjusted after mixing rubber powder. Select the appropriate sulfur vulcanization system or peroxide vulcanization system, adjust the dosage of vulcanizing agent, accelerator, zinc oxide, stearic acid and other compounding agents to ensure the cross-linking density and physical and mechanical properties of the rubber compound; Appropriate addition of coupling agent or other modifier to improve the blending effect of rubber powder in tires, and then improve the comprehensive performance index of tire rubber compounds and improve the mileage of automobile tires.
When mixing vulcanized rubber powder in automobile tires to reduce costs, it is also necessary to select appropriate production equipment and appropriately adjust the production process parameters to ensure that the rubber powder is fully dispersed in the production process, ensure the uniformity of the rubber material, avoid affecting the mixing effect and finished product performance, and improve production efficiency.
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