Chlorinated butyl rubber is prepared by introducing butyl rubber solution into chlorine gas. It has good air tightness, heat resistance, flexion resistance, aging resistance, weather resistance and shock absorption. It is an ideal raw material for producing heat-resistant rubber products. The chlorinated butyl reclaimed rubber is mostly processed with medicinal butyl bottle stopper as raw material, and retains the basic performance characteristics of chlorinated butyl rubber. It can be used alone or together with chlorinated butyl rubber to produce heat-resistant rubber products. When using chlorinated butyl reclaimed rubber to produce heat-resistant rubber products, a reasonable design of the blending system can further improve the heat resistance of the rubber compound.
1. How to improve the heat resistance of chlorinated butyl reclaimed rubber by curing system
The chlorinated butyl reclaimed rubber has good heat resistance and can maintain good service performance for a long time under high temperature. When using chlorinated butyl reclaimed rubber as the main raw material to produce heat-resistant rubber products, the curing system has a great influence on the heat resistance of chlorinated butyl reclaimed rubber vulcanizate. The chlorinated butyl reclaimed rubber vulcanized with sulfur curing system has the worst heat resistance. The heat resistance of the vulcanized with thiuram-thiazole system is better than that with sulfur, and the chlorinated butyl reclaimed rubber vulcanized with zinc oxide and resin curing system has better heat resistance.
The compound cured with pure zinc oxide has good heat resistance, but the curing speed is slow. It is suggested that it can be combined with thiuram accelerator, thiazole accelerator or magnesium oxide 2SLYY33. The common combination is zinc oxide/magnesium oxide/accelerator DM/accelerator TMTD. Phenolic resin can also be used with zinc oxide as the curing system of chlorinated butyl reclaimed rubber, with good curing and heat resistance.
2. How to improve the heat resistance of chlorinated butyl reclaimed rubber by reinforcement system
When using chlorinated butyl reclaimed rubber as the main raw material to produce heat-resistant rubber products, the reinforcing system has certain influence on the heat resistance of the rubber compound; In terms of heat resistance, general carbon black is better than inorganic filler, and the stronger the reinforcing performance, the better the carbon black. The reinforcing effect of inorganic filler on chlorinated butyl rubber is poor, and the heat resistance is not as good as carbon black; However, the heat resistance of chlorinated butyl reclaimed rubber reinforced by flaky clay is better than that of fillers such as silica.
Chlorinated butyl reclaimed rubber can be used alone or in combination with chlorinated butyl rubber and butyl reclaimed rubber to produce heat resistant rubber tubes, heat resistant rubber plates, heat resistant conveyor belts, heat resistant gaskets, etc; To improve the heat resistance of chlorinated butyl reclaimed rubber, the rubber product manufacturer also needs to properly adjust the softening and plasticizing system and production process conditions. The editor will continue to discuss relevant issues with you later.
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