Chlorobutyl rubber stopper is prepared by passing chlorine gas into butyl rubber solution. Chlorination occurs in the isoprene part, and most of it is the substitution reaction of chlorine. The double bond of butyl rubber is basically completely preserved, corresponding to each An isoprene double-bonded mer, essentially replacing a chlorine atom.

Heat resistance

Chlorobutyl rubber stopper has good heat resistance and relatively low degradation at high temperature and long time. The performance of long-term aging at 121 °C is obviously better than that of natural rubber. The heat resistance of chlorobutyl rubber is not only related to the polymer itself, but also to the vulcanization system and reinforcement system.

Flexibility

The flexural resistance of chlorobutyl rubber stopper is very important. Chlorobutyl rubber has excellent heat resistance, and the vulcanizate has a tight structure, so it has good flex resistance. On the other hand, chlorobutyl rubber has a large hysteresis loss, and when used under dynamic conditions, the heat generation is also large, which will reduce its flexural resistance.