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Chlorosulfonated polyethylene (alias: Hypalon) is a type of special rubber prepared by chlorination and chlorosulfonation of polyethylene. After the chlorination and sulfonation of polyethylene, the regularity of its structure is destroyed, and it becomes a soft and elastic chlorosulfonated polyethylene rubber at room temperature.

Chlorosulfonated polyethylene is obtained by dissolving polyethylene in carbon tetrachloride, tetrachloroethylene or hexachloroacetylene, using azodiisobutyronitrile as a catalyst or under ultraviolet light, and entering a mixture of chlorine and sulfur dioxide or treating it with sulfinyl chloride SO2CI. The brief structure is as follows:

The properties of chlorosulfonated polyethylene rubber depend on the molecular weight of the raw polyethylene and the relative content of chlorine and sulfur. Among them, the molecular weight of polyethylene has a great influence on the properties of chlorosulfonated polyethylene: the molecular weight is too low, the finished product has high viscosity and low tensile strength; Its physical and mechanical properties improve with the increase of polyethylene molecular weight, but after increasing to a certain limit, the effect on its properties is not obvious. Generally, the molecular weight of polyethylene is 2w~10w. Among them, chlorosulfonated polyethylene 20 and 30 use high-pressure polyethylene with low molecular weight 2w~4w; Chlorosulfonated polyethylene 40 and 45 commonly used low-pressure polyethylene with molecular weight 8W~10W.

The introduction of chlorine atoms into the molecular chain of polyethylene can eliminate the crystallinity of the molecule while maintaining the excellent properties of polyethylene, and the resulting elastomer is soft and easy to process. The hardness and strength of polymers with chlorine content of 25%~38% are the smallest, and the hardness and strength of polymers will be increased by continuing to increase the chlorine content. Tests have shown that the optimal chlorine content is about 27%. When the chlorine content is high, the solvent resistance and oil resistance of the obtained polymer are better, and the strength at higher temperatures is also larger, but the compression set and brittleness at low temperatures increase. When the chlorine content is 27%~30%, the polymer has sufficient plasticity and has good processing properties.