What is the significance of secondary vulcanization of silica gel products?
Release time:
2021-07-27 10:34
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When producing silica gel products, some products require secondary vulcanization, which is also called post vulcanization. Why do you do this? What's the point?
Firstly, generally, the pull-up strength, resilience, hardness, swelling degree, density and thermal stability of secondary vulcanized silica gel products are greatly improved than those of primary vulcanization. Secondly, when silicone rubber is vulcanized with peroxide, low molecular compounds (such as benzene and benzoic acid) will be generated after peroxide decomposition and polymer reaction, which will affect the mechanical properties of rubber. In short, after the silicone rubber is heated and formed in the first stage, its crosslinking density is not enough. It is necessary to make its further vulcanization reaction to increase the density of silicone rubber. If the secondary vulcanization is not carried out, the performance of silicone hose products may be affected to a certain extent and products with better performance will not be obtained.
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