直流GIL绝缘子环氧树脂/碳纳米管复合涂层关键物理性能的分子动力学模拟

doi:10.19595/j.cnki.1000-6753.tces.180811

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摘要

盆式绝缘子表面电荷积聚是导致直流气体绝缘金属封闭输电线路（GIL）无法长期稳定运行的主要原因,对绝缘子表面覆以涂层以改善电场分布是一种有效的措施。由于复合涂层材料制备工作存在重复性和试探性,本文基于分子动力学模拟方法,进行有针对性的纳米颗粒设计与掺杂,建立了纯交联环氧树脂和掺杂了四种碳纳米管（未封端、半封端、全封端和氨基胺功能化）的环氧树脂复合材料模型。基于上述模型,在LAMMPS下计算了介电常数、热扩散系数（热导率、比热容）、力学性能以及玻璃转化温度。结果表明：掺杂了上述四种碳纳米管的环氧树脂复合材料性能均有所提升,但提升程度有所不同。其中,掺杂了氨基胺功能化碳纳米管的复合材料在力学性能、介电常数以及热扩散系数上提升最明显,包括抑制温升对力学性能的破坏,减小介电常数24.8%,提高热扩散系数96.98%;掺杂了全封端碳纳米管的复合材料仅可最大程度提升玻璃转化温度为25.7K,其余关键物理性能提升不明显。综合模拟计算结果,认为选用氨基胺功能化碳纳米管作为环氧树脂的掺杂颗粒更加符合对表面电荷积聚抑制的需求。

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	韩智云
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关键词 ：环氧树脂, 碳纳米管, 分子动力学模拟, 介电常数, 热扩散系数

Abstract：

The surface charge accumulation on the basin insulators is the main reason for the long-term operation of DC gas insulated metal-enclosed transmission line (DC-GIL). It is an effective measure to improve the electric field distribution by coating the insulator surface. There are many repetitive tests for designing composite coating materials. In this paper, based on the molecular dynamics simulation method, nanoparticles were designed and doped in a targeted way. Epoxy resin and four kinds of carbon nanotubes (uncapped, semi-capped, all-capped, and amido-amine functionalized) composite models were established. According to the models, the vital physical properties including mechanical properties, dielectric constant, thermal diffusivity (thermal conductivity, specific heat capacity), and glass transition temperature were calculated under LAMMPS. The results show that the physical properties of the epoxy composites can be enhanced by doping the carbon nanotubes. The composites doped with amido-amine functionalized carbon nanotubes show the most obvious improvement in mechanical properties, dielectric constant and thermal diffusivity, including inhibition of the damage of temperature rise to mechanical properties, reduction of the dielectric constant reduced by 24.8% and the increase of thermal diffusivity by 96.98%. The composites doped with all-capped carbon nanotubes only maximize the glass transition temperature of 25.7K, while the other properties are not significantly improved. In terms of the computed results, it is concluded that the selection of amido-amine functionalized carbon nanotubes as the doped particles of epoxy resin is more suitable for the suppression of surface charge accumulation in practical engineering.

Key words： Epoxy resin carbon nanotubes molecular dynamics simulation dielectric constant thermal diffusivity

收稿日期: 2018-05-11 出版日期: 2018-10-30

PACS:

TM215.9

基金资助:

国家自然科学基金（51737005）,北京市自然科学基金（3172035）,山东省重点研发计划（2018GGX104009）和山东大学基本科研业务费专项资金（2017JC017）资助项目

作者简介: 韩智云男,1995年生,硕士研究生,研究方向为分子模拟与绝缘材料设计、高压电磁装备磁化建模。E-mail: hanzhiyun1995@163.com; 邹亮男,1983年生,博士,副教授,研究方向为高电压与绝缘技术、应用电磁学等。E-mail: zouliang@sdu.edu.cn（通信作者）

引用本文:

韩智云, 邹亮, 辛喆, 赵彤, 张黎. 直流GIL绝缘子环氧树脂/碳纳米管复合涂层关键物理性能的分子动力学模拟[J]. 电工技术学报, 2018, 33(20): 4692-4703. Han Zhiyun, Zou Liang, Xin Zhe, Zhao Tong, Zhang Li. Molecular Dynamics Simulation of Vital Physical Properties of Epoxy/Carbon Nanotube Composite Coatings on DC GIL Insulators. Transactions of China Electrotechnical Society, 2018, 33(20): 4692-4703.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.180811 https://dgjsxb.ces-transaction.com/CN/Y2018/V33/I20/4692

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