Chlorinated polyethylene

Chlorinated polyethylene (CPE) is a kind of powder product which uses HDPE to suspend and chlorinate in water phase. With the increase of chlorination degree, the original crystalline HDPE gradually becomes an amorphous elastomer. The content of CL in CPE used as toughening agent is generally 25-45%. CPE has a wide source and low price. Besides toughening effect, it also has cold resistance, weather resistance, fire resistance and chemical resistance. At present, CPE is the leading impact modifier in China, especially in PVC pipe and profile production, most factories use CPE. The addition amount is generally 5-15. CPE can be used in combination with other toughening agents, such as rubber, EVA, etc., with better effect, but rubber additives are not resistant to aging.

CPE is chlorinated polyethylene, which is made of HDPE by partial chlorination. Due to the existence of chlorine atom, CPE has softness and some rubber properties, and makes CPB a polar polymer with the same polar group as PVC, increasing the compatibility with PVC, so the polymer chain can maintain enough van der Waals force, thus improving the impact resistance and toughening effect of PVC. Moreover, CPE has the function of accelerating PVC melting and plasticizing. With the increase of CPE content, the plasticizing time is shortened, the plasticizing torque and equilibrium torque are increased, and the viscosity of plasticized melt is increased.