Influence of main indexes of chlorinated polyethylene (CPE) on modification of rigid PVC(4)

Effect of CPE with different chlorine content on PVC modification:

The compatibility of CPE with PVC depends on the chlorine content of CPE and the distribution of chlorine atoms on the PE molecular chain. The amount of chlorine in CPE has a great influence on the modification effect of PVC. After chlorination of the same polyethylene raw material, different chlorine content has different modification effect on PVC. CPE with chlorine content below 25% is not compatible with PVC, so it is not suitable for PVC modification. CPE with a chlorine content of more than 40% has excellent compatibility with PVC, and can be used as a plasticizer for PVC, not suitable for use as an impact modifier; CPE with a chlorine content of 35 ~ 36% has low crystallinity and glass conversion temperature, good elasticity and compatibility with PVC, and is widely used as an impact modifier for hard PVC products.

Chlorine content is determined by the production process and ingredients, as long as the production ingredients are determined, the chlorine content is determined after the end of the reaction, although the chlorine content is a key factor affecting the performance of CPE, but it does not mean that it is technically difficult to control, so the chlorine content of the CPE products of various companies is usually no problem, are relatively stable.