Why Must Silicone Rubber Be Vulcanized?

- Dec 15, 2020-

Before vulcanization, it is what we usually call raw rubber. The rubber compound is made by refining many additives such as vulcanizing agent, release agent, etc. together with the raw rubber. It can be seen from the appearance. It breaks with one hand, no elasticity. If the mixed rubber is vulcanized and molded at a certain temperature, the product can be obtained.


If the secondary vulcanization is not carried out, the performance of the produced silica gel may be affected. The parameters of the first vulcanization and the second vulcanization may be different, which is related to the actual operation! There are many kinds of silicone vulcanization, including high temperature and room temperature. Take high-temperature silica gel as an example. Before vulcanization, it is what we usually call raw rubber. Rubber compound is made by refining many additives such as vulcanizing agent, release agent, etc. and raw rubber. It can be seen from the appearance. Hand-torn off, no elasticity. If the mixed rubber is vulcanized and molded at a certain temperature at a certain temperature, the product can be obtained.


In terms of improving vulcanization efficiency, it should be considered that the higher the vulcanization temperature, the better, but in fact, the vulcanization temperature cannot be increased indefinitely. Rubber products and silicone products are high-molecular polymers. High temperature will cause the cleavage reaction of the silicone rubber molecular chain, leading to the rupture of cross-linked bonds, that is, the phenomenon of "reversion", which reduces the physical and mechanical properties of the vulcanizate.