塑料科技2025，Vol.53Issue(2)：26-31,6.DOI:10.15925/j.cnki.issn1005-3360.2025.02.005
α-AI2O3/XLPE接地线绝缘材料的制备及性能分析
Preparation and Performance Analysis of α-Al2O3/XLPE Grounding Wire Insulation Materials
摘要
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分类
信息技术与安全科学引用本文复制引用
郭兴源,陈晓彬,林旭毅,姚迪吉,林弘,黄毓琦..α-AI2O3/XLPE接地线绝缘材料的制备及性能分析[J].塑料科技,2025,53(2):26-31,6.基金项目
南方电网公司科技项目资助(035200KC23070004) （035200KC23070004）
