国内外交联聚乙烯绝缘料用聚乙烯性能对比

Comparison of properties of polyethylene used for XLPE insulation materials at home and abroad

研究了国内外3种交联聚乙烯绝缘料用聚乙烯的基本物性、结构与性能之间的差异。结果表明:进口料的熔体流动速率较高,拉伸性能更好,重均分子量高,相对分子质量分布较窄,支化度和熔体强度低,端基双键含量高,但总双键含量与国产料接近。与进口料相比,国产料具有较高的熔融温度,较低的结晶温度。2种国产料交联性能有一定差别,其中一种国产料的平衡扭矩最大,交联时间短,估计与其支化度高,交联后缠结更充分有关。

The differences of three kinds of cross-linked polyethylene insulation materials at home and abroad in basic physical properties and structural properties were studied.The results show that the imported material has higher melt flow rate,better tensile properties,higher weight average molecular weight,narrower relative molecular weight distribution,lower branching degree and melt strength,and higher terminal double bond content,but its total double bond content is close to that of the domestic material.The domestic materials have higher melting temperature and lower crystallization temperature than those of imported resin.There are some differences in crosslinking properties between the two domestic materials.One domestic material has the largest equilibrium torque and short crosslinking time,which is estimated to be related to its high branching degree and more sufficient entanglement after crosslinking.