Rubber accelerators are rubber vulcanization accelerators. Rubber vulcanization is mainly carried out using sulfur, but the reaction between sulfur and rubber is very slow, so vulcanization accelerators came into being. Vulcanization accelerators are added to the rubber material to activate the vulcanizing agent, thereby accelerating the cross-linking reaction between the vulcanizing agent and the rubber molecules to shorten the vulcanization time and reduce the vulcanization temperature. The main use of vulcanization accelerator according to the chemical structure of the main sub-sulfonamide class, thiazole class, thiuram class, and part of the guanidine, thiourea and dithiocarbamate class. Among them, sulfonamides have the best overall performance and are most widely used.
Rubber accelerator is the after-effect accelerant of natural rubber, parylene rubber, isoamyl rubber, styrene-butadiene rubber and reclaimed rubber, usually used in the manufacture of cables, rubber cloth, rubber shoes, inner tubes, colorful products, etc. It is especially suitable for carbon black rubber with strong alkaline content. It is safe at operating temperature, with strong anti-scorch resistance, fast vulcanization speed, high fixed elongation strength, and can improve the use ratio of synthetic rubber. Low toxicity and high efficiency, it is an ideal substitute for NOBS, with excellent comprehensive performance, known as the standard accelerator. Widely used in the production of radial tires. It can be used with aldehyde amine, guanidine and thiuram accelerators, and when used with anti-coking agent PVI, it constitutes a good vulcanization system. Mainly used in the manufacture of tires, rubber shoes, hoses, tapes, cables.
The vulcanization mechanism of rubber is still not the same. This is because in the production of rubber products, the existence of insoluble natural rubber samples and a large number of simultaneous reactions, making it difficult for people to vulcanize rubber molecules into a complex polymer network of research, early proposed rubber vulcanization mechanism can be broadly divided into two kinds of free-radical mechanism and ionic mechanism.