What are the influencing factors of PVC thermal degradation?

Factors affecting the thermal degradation of polyvinyl chloride are as follows:

1, PVC shrink film change the weak links of the polymer chain; minimize the relative content of these genes in the resin production will be conducive to the improvement of product stability.

2, Shrink film degree of polymerization; the lower the degree of polymerization of the resin the faster the degradation.

3, temperature; the higher the temperature, the longer the heating time, the faster the degradation rate, PVC shrink film so the resin production process requires the vapor extraction and drying, PVC heat shrink film as well as the processing of kneading and plasticizing operations, should be as low as possible to reduce the temperature and processing time in order to reduce degradation.

4, PVC shrink film the impact of impurities; resin production and product processing may bring iron salts, zinc salts and copper salts, including residual polymerization initiator, can promote polymer degradation.