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疏水性气相SiO2改性环氧树脂的耐电晕性能

Corona resistance performance of epoxy resin modified by hydrophobic fumed SiO2

    摘要
  • 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纳米SiO2粒子掺杂量的增加而有所升高；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材料提高了21.35%；疏水性气相SiO2/EP复合材料耐电晕寿命随纳米SiO2粒子掺杂量增加而增加。在室温、80 kV/mm电场强度下，纳米SiO2粒子掺杂量为8wt%时，疏水性气相SiO2/EP耐电晕寿命可达42.7 h，是纯EP的18.9倍。

     

    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 fractions were prepared by heating and curing. The results of XRD detection and SEM observation confirm that the hydrophobic fumed SiO2 nanoparticles are 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 reaches the maximum value of 24.66 kV/mm with 2wt% nanoparticle addition, which is 21.35% higher than the pure EP. When the doping amount of SiO2 nano particles is 8wt%, the corona life of the hydrophobic fumed SiO2/EP can reach 42.7 h, which is 18.9 times that of the pure EP.

     

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