Abstract:

Medium⁃long carbon chain chlorine paraffin （chlorine paraffin⁃52， CP⁃52） was added in the poly（vinyl chloride） （PVC） products plasticized with bis（2⁃ethylhexyl） phthalate （DEHP）. The performance of PVC products before and after the addition of chlorine paraffin was investigated. The thermal weight analyzer was used to evaluate the thermal stability of PVC films before and after the addition of chlorine paraffin. The mechanical properties of PVC films were measured by using a servo⁃control tension test machine， and the migration resistance of plastic system in PVC films was analyzed. The results indicated that the thermal stability of PVC specimens was improved with the addition of CP⁃52 and DEHP， and its onset decomposition temperature increased by 7.4 ºC from 251.6 ºC （0⁃CP⁃52/DEHP） to 259.0 ºC （40⁃CP⁃52/DEHP）. The addition of chlorine paraffin enhanced the aging resistance of PVC. In addition， the fracture elongation and tensile strength of PVC products were improved greatly. When the addition amount of chlorine paraffin was 30 wt%， the fracture elongation and tensile strength of the PVC films were increased by 4.7 times and 4 times， respectively. Their extraction resistance， volatile resistance， and migration resistance in food simulation liquid were improved. The addition of CP⁃52 can reduce the cost of PVC products， thus providing low⁃cost and high⁃performance formulations for PVC products.

Key words: medium?long carbon chain chloroparaffin, bis（2?ethylhexyl） phthalate, poly（vinyl chloride）, resistant migr?ation, mechanical property