Epoxy cured by acid anhydride has good insulating properties

high temperature resistance

chemical resistance and moisture resistance

and is widely used in the electrical field. However

the cross-linked three-dimensional permanent network of internal polymer chains leads to its inability to effectively degrade

so the recovery of epoxy-cast dry transformers

bushings

insulators

insulation tubes and other devices has become a major problem. Bisphenol A diglycidyl ether and methyl hexahydrophthalic anhydride were used as raw materials

and 1

5

7-triazidobicyclic (4.4.0) dece-5-ene (TBD) was used as catalyst to prepare anhydride cured epoxy insulating materials with different catalyst contents through curing reaction. The dielectric properties

thermal stability and breakdown characteristics of the material meet the requirements of insulating materials

and the comprehensive properties of the material are the best when the molar ratio of bisphenol A to TBD is 1:0.03. We used different qualities of diethylenetriamine to degrade the same quality of crushed materials. After 12 hours of degradation

it was concluded that when the mass ratio of material to degradation solution was 1:7

complete degradation could be achieved

and the degradation rate was the fastest. Bisphenol A diglycidyl ether was recured with the complete degradation product as the curing agent

and the obtained epoxy was characterized by Fourier infrared structure

which proved that the curing was successful; moreover

its dielectric constant

dielectric loss

thermal stability and breakdown field strength were characterized. The results show that the recovered material still has good comprehensive properties.