As we all know, when molding rubber and silica gel products, if the vulcanization temperature is increased, the vulcanization time can be shortened and the vulcanization efficiency will be effectively improved. Therefore, many vulcanization molding practitioners will start to raise the temperature in order to speed up the molding speed of silicone rubber products in the early stage. Sometimes it can shorten the curing time and improve the production efficiency. But sometimes it will be self defeating. Instead of increasing production capacity, there will be a lot of defective products. What's the matter?
In fact, the vulcanization temperature of silica gel and rubber can not be increased indefinitely, because silica gel and rubber are high molecular polymers. Too high temperature will lead to the cracking reaction of rubber molecular chain, resulting in cross-linking fracture, resulting in the phenomenon of "vulcanization return to the original", resulting in the decline of physical and mechanical properties of silica gel and rubber products, that is, embrittlement and fracture. Based on many years of production experience, Xiaobian shared that the vulcanization temperature of common silicone rubber products is generally 140 ~ 150 ℃, and the high is no more than 160 ℃;