辐射交联聚氯乙烯绝缘材料的研究Ⅱ.添加一缩三乙二醇二丙烯酸酯的影?

STUDY ON RADIATION CROSSLINKING OF PVC INSULATION MATERIALS PART Ⅱ DGDA EFFECT

本文研究了聚氯乙烯(PVC)在添加一缩二乙二醇二丙烯酸酯双官能团单体(DGDA)条件下的辐射交联效应。辐射初期PVC的交联反应速度较快,当剂量达到40kGy以后,凝胶含量达到最大值。在相同剂量条件下,PVC的凝胶含量、交联G值随DGDA添加量的增加而提高。交联PVC比未交联PVC的体积电阻系数有明显的提高,说明PVC辐射交联后的电绝缘性能得到很大改善。交联后,它的机械性能也有一定的提高。辐射交联PVC的热老化失重比未交联的PVC有较大的减少,而拉伸强度残留率K_1和断裂伸长率残留率K_2比未交联的PVC有较大提高,也就是说PVC交联后的耐温性提高了。

This paper reports the effect of difunctional monomer, diethylene gly-col diacrylate (DGDA) on radiation crosslinking of PVC. Crosslinking of PVC proceeds very rapidly during the initial period of irradiation.When the dose reaches 40 kGy. it slows down and the gel content tends to level off.Under the same dose condition, PVC gel content and G value increase with increaseof the amount of DGDA. Radiation Crosslinked PVC has a good insulating property and mechanicalproperty. By comparing crosslinked PVC with uncrosslinked PVC, the loss weight afterthermal aging of crosslinked PVC has a great decrease. But the tensile strength afteraging (K_1) and the elongation after aging (K_2) of crosslinked PVC have a great inc-rease respectively. It was also found that the heat-resisting property of PVC had beenimproved after being crosslinked.