The rubber materials used in the parts of ordinary conveyor belts include cover rubber, buffer rubber, cloth layer rubbing rubber and cloth layer glue, among which the conveyor belt cover rubber is required to have good tensile strength, wear resistance, aging resistance, and tear resistance. , Viscous properties to better cope with material impact, abrasion and microbial erosion. In actual production, the common rubber conveyor belt covering rubber is mostly processed from natural rubber and styrene-butadiene rubber. The rational use of vulcanized rubber powder can reduce the cost and improve the comprehensive performance of the conveyor belt covering rubber.
1. Influence of vulcanized rubber powder on the physical properties of conveyor belt covering rubber
(1) Tensile strength: After the conveyor belt cover rubber is mixed with vulcanized rubber powder, the tensile strength of the cover rubber will decrease to a certain extent; slow. Theoretically, using vulcanized rubber powder with a fineness of 80 mesh or above, and refining the rubber powder, the tensile strength of the conveyor belt covering rubber is higher; if the rubber powder is not refined, it is recommended to add a certain proportion of sulfur, and the tensile strength will decrease. Slow down; direct mixing of rubber powder in conveyor belt cover rubber is not recommended.
(2) Wear performance: After the conveyor belt cover rubber is mixed with vulcanized rubber powder, the wear amount of the cover rubber is reduced; the use of vulcanized rubber powder in some conveyor belt cover rubber with low rubber content can improve the wear performance and wear resistance. Significantly improved.
(3) Tear performance: When the conveyor belt covering rubber is directly mixed with tire rubber powder, the tear performance of the covering rubber will increase with the increase in the proportion of rubber powder; The proportion of rubber powder 2ELYY628 increased and decreased. Appropriately increase the amount of sulfur in the formula, the number of polysulfide crosslinks increases, and the tearing performance of the covering rubber is significantly improved.
2. The ideal addition amount of vulcanized rubber powder in conveyor belt covering rubber
The reasonable mixing of vulcanized rubber powder in the conveyor belt covering rubber will basically not affect the mixing performance of the rubber compound, and it has a certain effect of accelerating vulcanization. Under the condition of the same amount of rubber powder in the conveyor belt covering rubber, the comprehensive performance of the rubber compound refined by the rubber powder is the best. In actual production, it is recommended to use refined 80-mesh vulcanized rubber powder for ordinary conveyor belt covering rubber, and the mixing amount can reach 20 parts. The vulcanized rubber powder is directly mixed with the conveyor belt covering rubber, and the amount should not exceed 10 parts; the amount of sulfur should be appropriately increased, and the mixing amount can be increased to about 20 parts.
When using vulcanized rubber powder to reduce the manufacturing cost of ordinary conveyor belt covering rubber, the conveyor belt manufacturer must select the appropriate vulcanized rubber powder according to the actual needs, and choose to increase the amount of sulfur or refine the rubber powder according to the actual situation; appropriately increase the amount of rubber powder , improve the combination among rubber powder and matrix glue, and reduce more costs on the premise of ensuring the performance of the conveyor belt.
Exclusive original article [commercial authorization] reprint, excerpt and excerpt in any form are prohibited without written authorization. Focus on Hongyun rubber: learn the process formula and raw material technology of producing rubber products from recycled rubber to help you reduce costs and increase profits