α-Al2O3/XLPE接地线绝缘材料的制备及性能分析

郭兴源, 陈晓彬, 林旭毅, 姚迪吉, 林弘, 黄毓琦

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塑料科技 ›› 2025, Vol. 53 ›› Issue (02) : 26-31. DOI: 10.15925/j.cnki.issn1005-3360.2025.02.005
理论与研究

α-Al2O3/XLPE接地线绝缘材料的制备及性能分析

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Preparation and Performance Analysis of α-Al2O3/XLPE Grounding Wire Insulation Materials

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摘要

采用熔盐法制备α-Al2O3,采用硅烷偶联剂γ-氨丙基三乙氧基硅烷(KH550)对α-Al2O3进行表面改性,得到KH-α-Al2O3。以低密度聚乙烯(LDPE)为基体、不同的α-Al2O3为添加剂,制备α-Al2O3/XLPE和KH-α-Al2O3/XLPE接地线绝缘材料。对α-Al2O3和KH-α-Al2O3的晶体结构、微观结构以及基团进行分析,考察不同α-Al2O3含量对α-Al2O3/XLPE接地线绝缘材料电学性能和热学性能的影响。结果表明:熔盐法制备的α-Al2O3是具有六方结构、结晶度高、直径5~10 μm的不规则圆片,KH550的改性不会造成α-Al2O3结晶度的变化。KH-α-Al2O3在KH-α-Al2O3/XLPE接地线绝缘材料中沿材料厚度方向排列,且分散更为均匀,有利于抑制电荷在基体中的传输。KH-α-Al2O3有利于提高XLPE的直流击穿场强和直流电导率。当KH-α-Al2O3的添加质量分数为1.5%时,KH-α-Al2O3/XLPE的直流击穿场强达到320 kV/mm,电导率为1.043×10-13 S/m。KH-α-Al2O3的引入使XLPE基体和KH-α-Al2O3之间的界面产生一定数量的陷阱,有效实现了对注入电荷的抑制。KH-α-Al2O3可以明显降低XLPE的热失重速率,提高KH-α-Al2O3/XLPE接地线绝缘材料热稳定性。当KH-α-Al2O3的质量分数达到1.5%时,分解温度升高至475.44 ℃,90 ℃条件下的导热系数从0.390 W/(m·K)增加到0.545 W/(m·K)。

Abstract

α-Al2O3 was prepared using the molten salt method, and its surface was modified with the silane coupling agent γ-aminopropyltriethoxysilane (KH550), resulting in KH-α-Al2O3. Using low-density polyethylene (LDPE) as the matrix and different α-Al2O3 as additives, grounding wire insulation materials of α-Al2O3/XLPE and KH-α-Al2O3/XLPE were prepared. The crystal structure, microstructure, and functional groups of α-Al2O3 and KH-α-Al2O3 were analyzed, and the effects of different α-Al2O3 contents on the electrical and thermal properties of α-Al2O3/XLPE grounding wire insulation materials were investigated. The results show that the α-Al2O3 prepared by the molten salt method has a hexagonal structure, high crystallinity, and is an irregular disc with a diameter of 5~10 μm. The modification with KH550 does not alter the crystallinity of α-Al2O3. In the KH-α-Al2O3/XLPE grounding wire insulation material, KH-α-Al2O3 is aligned along the thickness direction of the material and is more uniformly dispersed, which is beneficial for suppressing charge transport within the matrix. KH-α-Al2O3 enhances the DC breakdown strength and DC conductivity of XLPE. When the mass fraction of KH-α-Al2O3 is 1.5%, the DC breakdown strength of KH-α-Al2O3/XLPE reaches 320 kV/mm, and the conductivity is 1.043×10⁻¹³ S/m. The introduction of KH-α-Al2O3 creates a certain number of traps at the interface between the XLPE matrix and KH-α-Al2O3, and effectively suppresses the injection of charges. KH-α-Al2O3 significantly reduces the thermal degradation rate of XLPE and improves the thermal stability of the KH-α-Al2O3/XLPE grounding wire insulation material. When the mass fraction of KH-α-Al2O3 reaches 1.5%, the decomposition temperature increases to 475.44 ℃, and the thermal conductivity under 90 ℃ conditions increases from 0.390 W/(m·K) to 0.545 W/(m·K).

关键词

α-Al2O3/XLPE / 接地线 / 绝缘材料 / 击穿场强 / 空间电荷

Key words

α-Al2O3/XLPE / Grounding wire / Insulation materials / Breakdown field strength / Space charge

中图分类号

TM21

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郭兴源 , 陈晓彬 , 林旭毅 , . α-Al2O3/XLPE接地线绝缘材料的制备及性能分析. 塑料科技. 2025, 53(02): 26-31 https://doi.org/10.15925/j.cnki.issn1005-3360.2025.02.005
GUO Xingyuan, CHEN Xiaobin, LIN Xuyi, et al. Preparation and Performance Analysis of α-Al2O3/XLPE Grounding Wire Insulation Materials[J]. Plastics Science and Technology. 2025, 53(02): 26-31 https://doi.org/10.15925/j.cnki.issn1005-3360.2025.02.005

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基金

南方电网公司科技项目资助(035200KC23070004)

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