Secondary vulcanization of silicone rubber materials, also known as vulcanization or secondary vulcanization, that is, silicone products to a certain degree of vulcanization, remove the heat source, continue to heat and vulcanization.

In fact, silicone products vulcanized to a certain extent, even if there is no heating, it can still play the role of residual heat, or in the product storage process, to continue to deepen the vulcanization process, or in the dynamic role of continuous crosslinking. Also includes the process of continued heating in the second stage of the vulcanization process; secondary vulcanization is to make rubber products to further crosslinking, improve the mechanical properties of silicone products and compression deformation properties, etc..

Secondary vulcanization can be used oven hot air vulcanization or vulcanization tank hot air secondary vulcanization. Now there are many rubber seals or rubber products production units using secondary vulcanization process for the production of rubber seals, the process is also changing with the times, constantly updated and optimized.

So, do you know the role of secondary vulcanization of silicone materials?

Silicone materials with peroxide (i.e. silicone vulcanizing agent) vulcanization, peroxide decomposition triggered by polymer reaction produces low molecular compounds, will affect the mechanical properties of rubber. And the crosslink density of silicone rubber after the first stage of heating and molding is not enough, only through further vulcanization reaction to improve the density of silicone rubber, tensile strength, resilience, hardness, solubility, density and thermal stability than the first vulcanization has been greatly improved.

In the absence of secondary vulcanization, may produce silicone performance will be affected to a certain extent, the better performance of the product is more than worth it, the parameters of the primary vulcanization may be different from the parameters of the secondary vulcanization, which is related to the actual operation of the silicone vulcanization of a variety of types of silicone rubber, high temperature, room temperature can be used.

If the rubber after mixing at a certain temperature vulcanization molding, at a certain temperature can be made products, such as we usually know of silicone bottle covers, silicone bracelets, silicone bottle covers, silicone seals, silicone pads, silicone cell phone covers, etc., as long as the regular manufacturers, the use of qualified silicone raw materials, the production of silica gel products, is generally non-toxic.