What Is Silicone Revulcanization?

Secondary vulcanization, also called post-vulcanization or two-stage vulcanization, refers to the process of rubber products reaching a certain degree of vulcanization and removing the heat source to continue heating vulcanization. In a broad sense, silicone products are vulcanized to a certain extent, even if not heated, it can still continue to deepen the vulcanization process under the action of waste heat, or in the storage process of the product, or continue to cross-link under the dynamic action. Of course, it also includes the processing technology of continuous heating for two-stage vulcanization;

The purpose of secondary vulcanization is to further cross-link rubber products and improve the mechanical properties and compressive deformation properties of rubber products.

The method of secondary vulcanization is hot air vulcanization in oven or hot air vulcanization in canister.

At present, many silicone seals or silicone products production units use secondary vulcanization technology to make silicone seal products, and the technology is also changing with The Times, constantly updated, and constantly optimized!

General silicone fluorine rubber is second vulcanized, due to a single vulcanization due to incomplete vulcanization or vulcanization process produces products that affect rubber crosslinking density, and need to be second vulcanized, while improving the mechanical properties and compression deformation properties of rubber products

Secondary vulcanization is also called post-vulcanization. Commonly used in silicone, fluorine rubber and fluorine silicone vulcanization. The role of secondary vulcanization: When silica gel is vulcanized by peroxide, after the decomposition of peroxide leads to the reaction of polymers, low molecular compounds (such as benzene and benzoic acid, etc.) are generated in rubber, which will affect the mechanical properties of rubber. Moreover, silica gel in the first stage of heating molding, its crosslinking density is not enough, to make it further vulcanization reaction to increase the density of silica gel. The tensile strength, resilience, hardness, swelling degree, density and thermal stability are greatly improved than that of single vulcanization. If the secondary vulcanization is not carried out, the performance of the silicone produced may be affected to a certain extent, and the products with better performance can not be obtained. The parameters of primary vulcanization and secondary vulcanization may be different, which is related to the actual operation!