Vulcanized rubber powder is mainly waste tire waste rubber products crushed or ground by mechanical processing, microstructure is a fragment of cross-linked network-like structure, containing unsaturated double bonds, with re-cross-linking function, can be added back to the production of rubber products, tire rubber is one of them. The rational use of vulcanized rubber powder in tire rubber can not only reduce the cost of raw materials, but also improve the comprehensive index of rubber processing technology and finished products. Xiaobian will discuss with you today the advantages and skills of adding vulcanized rubber powder to tire compound.
1. The advantages of adding vulcanized rubber powder to tire compounds
(1) Reduce raw material costs: Compared with rubber raw materials and rubber additives, the price of vulcanized rubber powder is low, and the appropriate amount of vulcanized rubber powder in tire rubber can effectively reduce production costs.
(2) Improve the processing process: add an appropriate amount of vulcanized rubber powder to the tire compound, shorten the scorching time in the final rubber refining stage, and it is not easy to scorch when mixing and pressing; The rubber material has good roller wrapping performance during hot smelting E5LYY815, and the glue supply is continuous and non-stick to the roller; The expansion is small when extrusion, the size of the semi-finished product is stable, and the stiffness is good. During molding, the rubber powder can form a small channel with the contact surface of the mold, which is conducive to air discharge, improve the fluidity of the rubber material, and reduce the occurrence of problems such as lack of glue and foaming.
(3) Improve mechanical properties: Reasonable use of vulcanized rubber powder has better tear resistance, wear resistance, dynamic performance and flexural crack resistance; The fatigue resistance and crack propagation resistance of vulcanized rubber is higher than that without rubber powder, and the finer the rubber powder, the greater the improvement.
2. Tips for adding vulcanized rubber powder to tire compounds
(1) Choose the right rubber powder variety: Not all vulcanized rubber powders are suitable for tires, and the principle of "homologous matching" must be followed. For example, butyl rubber powder should not be used on tread that pays attention to wear resistance, but can be used for airtight layers of the same material; It is recommended to use tire rubber powder for tire outer tire compound; Activated rubber powder can be used when necessary, and the mixing effect in tire compound is better.
(2) The effect of rubber powder fineness on tire compound: the rubber powder with small particle size has a larger specific surface area and is more closely bonded with the matrix glue; The higher the fineness of the rubber powder used in tire rubber powder, the closer the constant tensile stress, tensile strength, wear resistance and dynamic fatigue performance of the rubber material is to the original formula. Generally, 80 mesh rubber powder is recommended for steel wire radial tires, and 60-80 mesh is optional for diagonal load tires.
(3) Control the amount of rubber powder: Excessive use of vulcanized rubber powder will lead to a decrease in the physical and mechanical properties of tire rubber. When using natural rubber/styrene-butadiene rubber, natural rubber/butadiene rubber, natural rubber/styrene-butadiene rubber, natural rubber/styrene-butadiene rubber, and butadiene rubber can extend the tire mileage and improve the tear strength and wear resistance of the compound.
(4) Control the content of impurities in the rubber powder: Impurities such as fibers, metals, dust and moisture in the vulcanized rubber powder will affect the physical and mechanical properties of the tire rubber powder.
(5) Appropriate adjustment of the formula: the addition of vulcanized rubber powder to the tire rubber needs to be properly adjusted to the formula, such as adding 10 parts to the tire rubber powder, it is necessary to appropriately increase the operating oil and adjust the accelerator.
When adding vulcanized rubber powder to tire compound, it is not only necessary to choose the appropriate rubber powder variety, reasonably control the fineness, dosage and impurity content of the rubber powder, but also need to appropriately adjust the rubber formula and production process parameters, and discuss related issues with you later.
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