Some issues regarding chlorinated polyethylene：

Chlorinated polyethylene (CPE) is a saturated polymer material with a white powder appearance, non-toxic and odorless. It has excellent weather resistance, ozone resistance, chemical resistance, and aging resistance, as well as good oil resistance, flame retardancy, and coloring properties. Good toughness (still flexible at -30 ℃), good compatibility with other polymer materials, high decomposition temperature, decomposition produces HCL, which can catalyze the dechlorination reaction of CPE

The aqueous method of chlorinated polyethylene is commonly used, which has low production costs and poor pollution. Another method is the suspension method, which is relatively mature. Domestic ones can undergo secondary development and application with rapid development, and the drying speed is fast. It is commonly used in storage tanks and steel structures to improve construction safety.

Domestic chlorinated polyethylene (CPE) models are generally identified by numbers such as 135A, 140B, etc. The first digits 1 and 2 represent the residual crystallinity (TAC value), 1 represents the TAC value between 0 and 10%, 2 represents the TAC value>10%, the second and third digits represent the chlorine content, for example, 35 represents the chlorine content of 35%, and the last digit is the letter ABC, which is used to indicate the molecular weight of the raw material PE. A is the largest and C is the smallest.

The influence of molecular weight: Chlorinated polyethylene (CPE) has the highest molecular weight and high melting viscosity in its A-type material. Its viscosity matches PVC best and it has the best dispersion effect in PVC, forming an ideal network like dispersion form. Therefore, CPE’s A-type material is generally chosen as a modifier for PVC.

Mainly used for: wire and cable (coal mine cables, wires specified in UL and VDE standards), hydraulic hose, vehicle hose, tape, rubber plate, PVC profile pipe modification, magnetic materials, ABS modification, and so on. Especially the development of the wire and cable industry and the automotive parts manufacturing industry has driven the demand for rubber based CPE consumption. Rubber based CPE is a special synthetic rubber with excellent comprehensive performance, heat resistance to oxygen and ozone aging, and excellent flame retardancy.

Factors affecting the thermal decomposition temperature of CPE

The properties of CPE itself are related to its chlorine content. If the chlorine content is high, it is easier to decompose;

It is related to purity. Inadequate removal of initiators, catalysts, acids, bases, etc. added during the polymerization process, or absorption of water during storage and transportation, can reduce the stability of the polymer. These substances can cause molecular ion degradation reactions, and CPE contains more low molecular weight substances such as Cl2 and HCl, which can accelerate the thermal decomposition of the resin;