It is well known that butyl rubber synthesized from isobutylene and a small amount of isoprene has poor compatibility with other rubbers, and can only be used in combination with ethylene propylene rubber and polyethylene; and butyl rubber solution is introduced into chlorine gas. Chlorinated butyl rubber not only retains the inherent performance characteristics of butyl rubber, but also can be used in combination with a variety of rubbers to produce a wide variety of rubber products; then in actual production, chlorinated butyl rubber can be used with which rubber, What is the purpose?
Compared with butyl rubber, chlorobutyl rubber has high reactivity and fast vulcanization speed, and can be co-vulcanized with other types of rubber.
1. Chlorinated butyl rubber is used together with natural rubber and styrene-butadiene rubber.
Butyl rubber has poor mutual adhesion and low adhesion. It must be adhered to rubber or other materials by means of tackifiers and adhesion-promoting layers. Although chlorinated butyl rubber is improved in adhesion, it is still better than other rubbers. Certainly different. Natural rubber has good elasticity and high strength, and is easy to bond with other materials; styrene-butadiene rubber has good processability and adhesion, especially latex polystyrene-butadiene rubber; therefore, the combination of chlorobutyl rubber with natural rubber and styrene-butadiene rubber can significantly improve the rubber. Adhesive.
2. Chlorinated butyl rubber combined with nitrile rubber and neoprene
Both nitrile rubber and neoprene rubber are oil-resistant rubbers, which have excellent oil resistance. Although chlorobutyl rubber is not oil-resistant rubber, it can obtain certain oil resistance under the cooperation of appropriate compounding system; The use of a part of nitrile rubber or neoprene in the formulation of the product can significantly improve the oil resistance of the rubber product. The neoprene rubber obtained by α-polymerization using chloroprene as a main raw material also has a certain flame retardancy, and the neoprene can also improve the flame resistance of the chlorobutyl rubber.
3. Chlorinated butyl rubber combined with chlorosulfonated polyethylene rubber
Chlorosulfonated polyethylene rubber not only has excellent weather resistance, ozone resistance and chemical resistance, but also has good processing properties, higher breaking strength and elongation; therefore, manufacturers of chlorobutyl rubber products often The appropriate amount of chlorosulfonated polyethylene rubber is used in the formulation of the product to reduce the compression set and the hardness while reducing the compression set, further improve the aging resistance of the chlorobutyl rubber product, and prolong the chlorobutyl rubber product. Service life.
4. Chlorinated butyl rubber combined with reclaimed rubber
Chlorinated butyl rubber has very low gas permeability, excellent heat resistance, ozone resistance and chemical resistance. It can be used in the production of various butyl rubber products. However, the price of chlorobutyl rubber is less in the market. It is also high, so it is often used together with recycled rubber to produce rubber products. The chlorinated butyl rubber and the butyl chloride reclaimed rubber produced from the waste butyl caps are used to ensure the chlorination. The quality of the base rubber products can also improve the processing performance of the rubber compound and reduce the production cost. Chlorinated butyl rubber can also be used together with other special reclaimed rubber such as EPDM reclaimed rubber, which will not be elaborated here.
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