The demoldability during the rubber vulcanization process is a key indicator for directly judging whether the mixed silica gel can be applied. The mucous membrane and thermal death difference are not easy to demold. The increase in the reject rate seriously affects the product quality and yield.

Causes: The rubber has many low molecules, many small molecules, and many reactive groups. The temperature and time given by high-temperature vulcanization are not sufficient for complete reaction. It is caused by sticking with the surface of the product); the high temperature combination of the hydroxyl group on the silica surface of the silica and the metal surface causes the stickiness.

Solution: When designing the compound rubber compound, try to reduce the amount of hydroxy silicone oil modifier on the surface of white carbon black, use zinc stearate with mold release effect, etc .; increase the temperature and extend the time during kneading to let small molecules be discharged.