Basin insulators are an important part of gas insulated switchgear (GIS). The development of compact GIS requires higher heat resistance of basin insulators.  The heat resistance of a basin insulator depends on the thermal properties of its internal epoxy insulating material.  In view of the lack of research on improving the thermal properties of epoxy resin, bisphenol AF was used to carry out chain extension modification of epoxy resin, and the thermal properties of the modified epoxy resin were studied.   Different contents of bisphenol AF were used to modify the epoxy resin by chain extension, and the epoxy value and infrared test were carried out.  On this basis, the chain extension epoxy resin was prepared, and the thermal properties of the chain extension epoxy resin were studied.   The results show that bisphenol AF achieves the purpose of chain extension modification of epoxy resin, improves the glass transition temperature of epoxy resin and the thermal decomposition temperature of epoxy resin to a certain extent. This is consistent with the existing results and theories. Bisphenol AF introduced -CF3 with large group volume into the cured epoxy resin system, which made it difficult to rotate the polymer bond and break the chemical bond, thus improving the thermal properties of epoxy resin.  
 

epoxy resin insulating material,chain extension modification, thermal properties,glass transition temperature,thermal decomposition temperature