The present invention discloses a chlorosulfonated polyethylene cable sheath material and its preparation method, which is composed of chlorosulfonated polyethylene, impact resistant polystyrene, nano calcium carbonate, siliceous rock powder, modified zinc borate, ethyl carbamate, promoter CZ, silane coupling agent KH550, epoxy butyl stearate, dodecanol ester, alkylphenol polyoxyethylene ether, and diisobutyl phthalate as raw materials; The present invention uses chlorosulfonated polyethylene as the main material, which has excellent aging resistance, heat resistance, low temperature resistance, oil resistance, and electrical insulation resistance. Nano calcium carbonate is used as a reinforcing agent, and the flame retardant zinc borate is modified to greatly improve the flame retardancy of the cable sheath, resulting in a significant flame retardant effect.
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