中国塑料 ›› 2024, Vol. 38 ›› Issue (2): 20-25.DOI: 10.19491/j.issn.1001-9278.2024.02.004

• 材料与性能 • 上一篇    下一篇

改性纳米氧化镁交联聚乙烯复合材料的制备及其电气性能研究

陈清江(), 董志聪, 李红发, 吴毅江, 高松, 聂文翔, 罗应文   

  1. 广东电网有限责任公司中山供电局,广东 中山 528400
  • 收稿日期:2023-08-09 出版日期:2024-02-26 发布日期:2024-02-03
  • 作者简介:陈清江(1976—),男,高级工程师,从事输电线路运维技术管理,Ceigngdcgi3@163.com
  • 基金资助:
    中国南方电网有限责任公司科技项目资助[032000KK52220027(GDKJXM20220684)

Study on preparation and electrical properties of modified nano magnesia⁃crosslinked polyethylene composites

CHEN Qingjiang(), DONG Zhicong, LI Hongfa, WU Yijiang, GAO Song, NIE Wenxiang, LUO Yingwen   

  1. Zhongshan Power Supply Bureau,Guangdong Power Grid Co,Ltd,Zhongshan 528400,China
  • Received:2023-08-09 Online:2024-02-26 Published:2024-02-03

摘要:

为提高交联聚乙烯(PE⁃XL)绝缘性能,以聚乙烯(PE)为基体,以改性后的MgO(MgO⁃NH2)为填料进行复配交联制备了PE⁃XL/MgO⁃NH2纳米复合材料,对其热老化前后的电绝缘性能进行了研究,并与未改性的MgO交联聚乙烯复合材料(PE⁃XL/MgO)进行了对比研究。通过直流击穿强度、空间电荷和直流电导率来研究复合材料的绝缘性能。与未老化PE⁃XL/MgO相比,未老化PE⁃XL/MgO⁃NH2纳米复合材料的直流击穿强度提高了20 %,异质空间电荷积累可以忽略不计。热老化后,PE⁃XL/MgO和PE⁃XL/MgO⁃NH2纳米复合材料的直流击穿强度分别较热老化前降低了38 %和20 %。此外,将MgO表面改性后制备的PE⁃XL/MgO⁃NH2纳米复合材料比PE⁃XL/MgO具有更低的直流电导率。PE⁃XL/MgO⁃NH2纳米复合材料在未老化条件下表现出较好的性能,且对热老化可能引起的劣化表现出更强的抑制作用。

关键词: 改性纳米氧化镁, 聚乙烯, 复合材料, 电气性能

Abstract:

To improve the insulation performance of crosslinked polyethylene (PE⁃XL), MgO⁃NH2/PE⁃XL nanocomposites were prepared by using polyethylene (PE) as a matrix and modified MgO (MgO⁃NH2) as a filler. The electrical insulation performance of the nanocomposites before and after thermal aging was investigated. The obtained results were compared with the unmodified MgO⁃crosslinked polyethylene composites (PE⁃XL/MgO). The insulation properties of the nanocomposites were studied by DC breakdown strength, space charge, and DC conductivity. Compared to the non⁃aged PE⁃XL/MgO, the non⁃aged PE⁃XL/MgO⁃NH2 nanocomposites showed an increase in DC breakdown strength by 20 %, and the heterogeneous space charge accumulation could be negligible. After thermal aging, the breakdown strength of MgO /PE⁃XL and PE⁃XL/MgO⁃NH2 nanocomposites decreased by 38 % and 20 %, respectively, compared to those before thermal aging. In addition, the PE⁃XL/MgO⁃NH2 nanocomposites obtained from the surface modification of MgO have a lower DC conductivity than PE⁃XL/MgO. The PE⁃XL/MgO⁃NH2 nanocomposites exhibited better performance under non⁃aging conditions, and they also showed stronger inhibition to the deterioration caused by thermal aging.

Key words: modified nano magnesium oxide, polyethylene, composite material, electrical performance

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