纳米氧化镁聚丙烯复合绝缘材料的制备及其性能

发布时间：2018-08-20 18:45

【摘要】：与传统的电缆材料交联聚乙烯(XLPE)相比,聚丙烯(PP)不仅具有良好的电气性能,而且可循环利用,且其耐热性能好,因此受到研究者的广泛关注。故尝试选用聚丙烯作为基础树脂材料,同时探究添加纳米氧化镁(MgO)对聚丙烯绝缘性能的影响。选择嵌段共聚和均聚两种聚丙烯基础树脂材料,分别将质量分数为0.5%、1%、2%、3%的纳米氧化镁添加到PP中,综合不同样品的直流(DC)击穿场强等多因素,发现1%为纳米MgO的最佳添加量。再用两种不同的工序将质量分数为1%的纳米MgO和质量分数为5%的乙烯-辛烯弹性体(POE)加入到质量分数为95%的PP基体中,并与纯净的PP和PP与POE的共混物做对照。然后对样品的微观形貌、力学性能及电学性能进行表征。研究结果表明:纳米MgO加入到PP中,会起到异相成核剂的作用,减小PP内球晶的尺寸,且会诱导β晶生成;在PP中添加纳米MgO能大大降低其空间电荷密度,但对其力学性能影响不大;添加纳米MgO的PP直流击穿场强和直流叠加冲击电压与交联聚乙烯(XLPE)比较没有明显的差别。由此可知,可回收的热塑性聚丙烯高压直流电缆是未来高压直流电缆的一种新选择。
[Abstract]:Compared with the conventional cable material, (XLPE), polypropylene (PP) not only has good electrical properties, but also can be recycled, and its heat resistance is good, so it has been widely concerned by researchers. Therefore, we try to select polypropylene as the base resin material and explore the effect of nano-MgO (MgO) on the insulation properties of PP. Two kinds of polypropylene basic resin materials, block copolymerization and homopolymerization, were selected. The nano-MgO with a mass fraction of 0.5% and 2% was added to PP respectively. The best addition amount of nanometer MgO was found to be 1% by synthesizing the breakdown field strength of DC (DC) of different samples. Two different processes were used to add nano-scale MgO (1%) and ethylene-octene elastomer (POE) (5%) into PP matrix with 95% mass fraction. The results were compared with pure PP and PP / POE blends. Then the microstructure, mechanical properties and electrical properties of the samples were characterized. The results show that the addition of nanometer MgO to PP will play a role of heterogeneous nucleating agent, reduce the size of spherulites in PP, and induce 尾 -crystal formation, and the addition of nanometer MgO in PP can greatly reduce the space charge density of PP. The DC breakdown field strength and DC superposition impulse voltage of PP with nano MgO were not significantly different from those of (XLPE). Therefore, the recoverable thermoplastic polypropylene HVDC cable is a new choice of HVDC cable in the future.
【作者单位】：上海交通大学化学化工学院高分子科学与工程系;上海市电气绝缘与热老化重点实验室;上海电缆研究所;
【基金】：国家重点基础研究发展计划(973计划)(2014CB239503)~~
【分类号】：TM215.1

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