Improved XLPE water-tree ageing resistance and electrical properties by crosslinking auxiliary TAIC

Tiesong Liu, Junqi Chen, Hong Zhao

Key Laboratory of Engineering Dielectric and Its Application, Ministry of Education

Harbin University of Science and Technology, Harbin, Heilongjiang, China

hongzhao@hrbust.edu.cn



Purpose/Aim

Water-tree aging is one of the main reasons which result in cross-linked polyethylene (XLPE) cable electrical properties degradation. Triallyl isocyanurate (TAIC) as a crosslinking auxiliary is commonly used to improve polymers crosslinking degree. However, TAIC application in peroxide XLPE water-tree aging characteristics and electrical properties has not been reported at present.

XLPE是通过应用不同含量的TAIC与过氧化物交联来制备的。通过水刀电极加速老化实验研究了材料的抗水树性能。亲水角用于分析改性交联聚乙烯对水分子的吸附。通过电阻率、介电常数和交流击穿强度测试改性交联聚乙烯对电性能的变化。

加速水树老化实验验证了XLPE-0.2wt%TAIC对水树生长的抑制能力最强。而过多的 TAIC 会导致样品的抗水树能力下降。在低频下，XLPE-TAIC 的介电损耗角正切低于 XLPE。亲水分析表明TAIC可以吸收水分子。材料吸收过多的微小水滴导致样品的抗水树性降低。使用 TAIC 后，XLPE 的电阻率和交流击穿强度明显增加。

采用TAIC可明显抑制水树生长。TAIC对水分子的吸附机理是使XLPE抗水树性能显着提高的主导因素。此外，XLPE-TAIC 显示出对电性能的改进。