疏水性气相SiO2改性环氧树脂的耐电晕性能学术资讯

《复合材料学报》优先在线发表论文。

摘要：采用砂磨机将疏水性气相SiO2纳米粒子分散到无溶剂环氧树脂（Epoxy，EP）中，经加热固化后制备了不同掺杂量的疏水性气相SiO2/EP复合材料，通过XRD检测和SEM表征，证实疏水性气相SiO2纳米粒子以无定形态均匀分散在EP中。疏水性气相SiO2/EP复合材料的理化性能测试结果表明：其热稳定性、介电常数、介电损耗和电导率均随SiO2纳米粒子掺杂量的增大而有所升高；纳米SiO2粒子掺杂量为2wt %时，击穿场强达到最大值为24.66 kV/mm，较纯EP材料提升了21.35%；SiO2/EP复合材料耐电晕寿命随SiO2纳米粒子掺杂量增加而增加。在室温80kV/mm电场强度下，SiO2纳米粒子掺杂量为8wt%时，耐电晕寿命可达42.7h，是纯EP的18.9倍。

关键词：环氧树脂；疏水性气相SiO2；耐电晕寿命；介电性能；热稳定性

Abstract: The hydrophobic fumed SiO2 particles were dispersed in solvent-free epoxy resin (EP) by sand milling, hydrophobic fumed SiO2/EP composites with different hydrophobic fumed SiO2 mass ratios were prepared by heating and curing. The results of XRD detection and SEM observation confirmed that the hydrophobic fumed SiO2 nanoparticles were uniformly dispersed in EP in amorphous form. The results of the physical and chemical properties of the hydrophobic fumed SiO2/EP composites show that the thermal stability, dielectric constant, dielectric loss and electrical conductivity of the hydrophobic fumed SiO2/EP composites increase with the increase of the doping amount of SiO2 nanoparticles.The breakdown field strength reached the maximum value of 24.66 kV/mm with 2wt% nanoparticle addition, it`s 21.35% higher than pure EP material. The corona life of nanocomposites can reach 42.7 h, which is 18.9 times that of pure EP, with 8wt%nanoscale additions.