The semi-conductive (SC) screen materials used in polypropylene (PP)-based cables are usually multi-component composites. Polypropylene shows poor compatibility with carbon black (CB), and CB particles tend to disperse in the elastomer phase, which results in CB non-uniform dispersion in screen materials. The non-uniform distribution of CB will cause abnormal electric fields at the screen/insulation interface and affect insulation performance. This paper prepared modified PP grafted by molecule maleic anhydride, and four PP-based SC shielding materials were blended in combination with PP, PP-g-MAH, and thermoplastic elastomer (POE) as matrix resin. The CB distribution, electrical conductivity, and basic physical properties of the shielding material were characterised. Different screen materials were served as electrodes to test their effects on the space charge and conductivity characteristics of insulation. The relationship between the macroscopic properties and the distribution characteristics of CB was discussed. Results show that the selective dispersion of CB in screen material was improved by PP-g-MAH and the surface electric potential distribution was homogenised. Charge emission at the screen/insulation interface and conductivity can be reduced by homogenising the CB distribution. CB/PP-g-MAH/POE prepared in this paper exhibits relatively uniform CB distribution, which can reduce the charge emission from the screen/insulation interface.

中文翻译：

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聚丙烯基半导体屏幕材料炭黑分布的优化方法及其对屏幕/绝缘界面电荷发射行为的影响

聚丙烯 (PP) 基电缆中使用的半导体 (SC) 屏蔽材料通常是多组分复合材料。聚丙烯与炭黑（CB）相容性差，炭黑颗粒容易分散在弹性体相中，导致炭黑在丝网材料中分散不均匀。CB分布不均匀会造成屏/绝缘界面电场异常，影响绝缘性能。本文制备了分子马来酸酐接枝改性PP，并将四种PP基SC屏蔽材料与PP、PP-g-MAH和热塑性弹性体（POE）作为基体树脂共混。表征了屏蔽材料的炭黑分布、电导率和基本物理性能。以不同的屏蔽材料作为电极，测试了它们对绝缘空间电荷和电导率特性的影响。讨论了炭黑的宏观性质与分布特征之间的关系。结果表明，PP-g-MAH改善了炭黑在丝网材料中的选择性分散，使表面电势分布均匀化。可以通过均匀化 CB 分布来减少屏幕/绝缘界面处的电荷发射和电导率。本文制备的 CB/PP-g-MAH/POE 表现出相对均匀的 CB 分布，可以减少屏幕/绝缘界面的电荷发射。讨论了炭黑的宏观性质与分布特征之间的关系。结果表明，PP-g-MAH改善了炭黑在丝网材料中的选择性分散，使表面电势分布均匀化。可以通过均匀化 CB 分布来减少屏幕/绝缘界面处的电荷发射和电导率。本文制备的 CB/PP-g-MAH/POE 表现出相对均匀的 CB 分布，可以减少屏幕/绝缘界面的电荷发射。讨论了炭黑的宏观性质与分布特征之间的关系。结果表明，PP-g-MAH改善了炭黑在丝网材料中的选择性分散，使表面电势分布均匀化。可以通过均匀化 CB 分布来减少屏幕/绝缘界面处的电荷发射和电导率。本文制备的 CB/PP-g-MAH/POE 表现出相对均匀的 CB 分布，可以减少屏幕/绝缘界面的电荷发射。