The vulcanized rubber powder can replace part of the raw rubber or be filled as a filler in the production of rubber products, which can reduce the production cost of rubber products and improve the performance of rubber compounds. However, in actual production, improper use of vulcanized rubber powder can cause indicators such as mechanical strength of rubber products to decrease significantly. Why? How can rubber product manufacturers improve the mixing effect of vulcanized rubber powder in rubber products to achieve the purpose of further improving the quality of rubber products while reducing costs?
1. Mechanism of vulcanized rubber powder in rubber
When vulcanized rubber powder is added to rubber products, sulfur will be transferred from the rubber phase to the rubber powder during the vulcanization of the rubber material, resulting in a significant reduction in the sulfur concentration at the interface between the rubber powder and the rubber, a reduction in the number of vulcanization crosslinks, and an average rubber phase The decrease in cross-linking density leads to insufficient formation of cross-links at the interface, and mechanical strength such as tensile strength of the rubber compound decreases.
2.How to improve the mixing effect of vulcanized rubber powder in rubber
Adding vulcanized rubber powder to rubber products in theory will cause the mechanical strength of the products to decrease, so rubber product manufacturers need to make appropriate adjustments.
① Adjust the vulcanization system: when sulfur vulcanization is used, the sulfur content in the rubber product formula can be appropriately increased, and the accelerator with a fast vulcanization speed can be used to increase the sulfur concentration at the interface between the vulcanized rubber powder and the rubber, so as to improve the mechanical strength of the rubber product; When vulcanized rubber powder is added to rubber products, rubber product manufacturers can also choose sulfur-free vulcanization systems such as peroxides to avoid the problem of reducing the mechanical strength of rubber products caused by sulfur migration.
② Use of modified substances: When vulcanized rubber powder is used in the formulation of rubber products, rubber products factories can add appropriate amounts of modified phenolic resin, resorcinol or hexamethylenetetramine 1JLYY1230 during the plasticizing process. Improve the compatibility of rubber powder and rubber, so as to alleviate the problem of tensile strength reduction of rubber products caused by the addition of vulcanized rubber powder, and to a certain extent, improve the tear resistance of rubber products containing vulcanized rubber powder.
The vulcanized rubber powder produced by crushing waste rubber products has low prices and a wide range of raw materials. In the production of rubber products, it can not only reduce the cost of raw materials, improve the performance of rubber processing technology, but also solve the problem of waste rubber pollution. Win-win situation for the environment. In actual production, rubber product manufacturers need to select the appropriate vulcanized rubber powder, such as tire rubber powder, ethylene-propylene rubber powder, butyronitrile rubber powder, etc., according to the performance requirements of rubber products and rubber varieties, and reasonably adjust the rubber containing vulcanized rubber powder. Product formulations to optimize product quality and reduce costs.