The demoldability during the vulcanization of the rubber is a key indicator for directly judging whether the compounded silica gel can be used. It is not easy to demold the adhesive film and thermal tear. 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 mixing the rubber ingredients, 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 allow small molecules to be discharged.