中长碳链氯化石蜡在聚氯乙烯制品中的应用及性能研究

在以邻苯二甲酸二（2⁃乙基己）酯（DEHP）为增塑剂的聚氯乙烯（PVC）制片中复配中长碳链氯化石蜡（氯化石蜡⁃52，CP⁃52），研究复配氯化石蜡前后PVC制片的性能变化。利用热失重分析仪研究复配前后PVC制片的热稳定性变化；利用伺服控制拉力试验机研究复配前后PVC制片力学性能的变化；最后分析复配前后PVC制片中增塑体系的耐迁移情况。结果表明，在DEHP中复配CP⁃52后，可以提高PVC试片的热稳定性，起始分解温度T_i从251.6 ℃（0⁃CP⁃52/DEHP）最高提高到259.0 ℃（40⁃CP⁃52/DEHP），提高了7.4 ℃。氯化石蜡的添加也有助于提高PVC的耐老化性。另外，断裂伸长率和拉伸强度都有很大提升，复配比例为30 %时，PVC试片的断裂伸长率和拉伸强度分别提高至原来的4.7倍和4倍。耐抽出和耐挥发性能以及在食品模拟液中的耐迁移性都有所提高。复配CP⁃52后可降低PVC制品的成本，为PVC制品提供低成本高性能的配方。

Applications and performance of medium carbon chain chlorofaffin in PVC products

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.