CPE is chlorinated polyethylene, which is prepared by chlorination of special high-density polyethylene (HDPE), that is, chlorine atoms partially replace the hydrogen atoms on the molecular chain of HDPE. After drying, it is white powder, non-toxic.

CPE molecular formula: CH2-CHCl-CH2-CH2]n

English abbreviation: CPE or CM chlorinated polyethylene (CPE) is a saturated polymer material.

Characteristics

Because CPE molecule does not contain double chain, has good weather resistance, and has fire resistance, thermal stability is better than PVC, low cost, excellent performance. Soluble in aromatic hydrocarbons and halogenated hydrocarbons, insoluble in aliphatic hydrocarbons, decomposition above 170¡æ, the release of hydrogen chloride gas, it has a stable chemical structure, excellent aging resistance, fire resistance, cold resistance, weather resistance, free coloring, chemical resistance, ozone resistance and electrical insulation and good compatibility and processing, Can be mixed with PVC, PE, PS and rubber to improve its physical properties.

the three major factors influencing the performances of CPE

the first: PE used in kinds of & ndash; — CPE obtained from high molecular weight polyethylene has higher viscosity and tensile strength, but the adhesion between CPE and PVC resin is low, the viscosity and tensile strength of CPE obtained from low molecular weight polyethylene is low, and the CPE obtained from high density polyethylene has good heat resistance.

Second: the size of the raw material particles — — When the particle size is too small, it is easy to form gelled or clumpy CPE. When the particle size is too large, the distribution of chlorine is uneven, and it is difficult to dissolve in organic solvents. The particle size range is 0.1-200 &mu. m is best.

Third: the degree of chlorination of CPE — — When the chlorine content is below 25%, the compatibility with PVC is poor and can not be used as a modifier; Chlorine content is greater than 40% and PVC compatibility is good, can be used as a solid plasticizer, not suitable for impact modifier; CPE with a chlorine content of 36-38% has good elasticity and compatibility with PVC, so it is widely used as a PVC impact modifier.

Now the most used is CPE containing 35% chlorine, CPE with a chlorine content of about 35% of its crystallization and glass transition temperature are low, has good rubber elasticity, and has suitable compatibility with PVC, is widely used as PVC hard products impact modifier.