Study on improving external insulation performance by inhibiting hydroxyl content of epoxy composites
Wireless power transmission insulators are long challenged by harsh environmental conditions such as rain,fog,and dirt,placing stringent demands on the external insulation capabilities of epoxy composites.Impro-ving the hydrophobic performance of epoxy composites through molecular structure modification can effectively en-hance their external insulation performance.However,this method has risks of reducing the thermal and mechani-cal performance of the epoxy composites.This study utilizes a special bisphenol A-modified epoxy resin as a modifi-er,suppressing the hydroxyl content in the epoxy composites,thereby improving their hydrophobicity and hydropho-bic migration performance.The surface water contact angle and hydrophobic migration of the epoxy composites in-creased by 24.61%,and 51.21%.The increase of the surface roughness of the modified epoxy composite hindered the propagation of stress and enhanced its tensile strength.The development of conductive water films on the surface of epoxy composites is inhibited,thus enhancing the external insulation performance of the epoxy composites under conditions of water droplets and dirt.After a 6h test at 4.5 kV for resistance to electrical tracking,the maximum depth of surface erosion on the epoxy composites decreased by 86.18%,and the pollution flashover voltage in-creased by 13.78%.The thermal and mechanical performance of the epoxy composites were tested,and the addi-tion of the special modifier had little impact on their thermal stability and tensile strength.This study effectively im-proved the external insulation performance of the epoxy composites without compromising their thermal and mechan-ical performance.The results of this study can provide a reference for the design of insulation materials for external insulation equipment such as composite insulators.
wireless power transmission insulatorsmolecular structure designwater repellencymigration of hy-drophobicityexternal insulation performance
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