By incorporating reversible dynamic covalent bonds into the glass-like polymer epoxy resin

the material can be crushed and hot-pressed for recovery and reuse; however

the properties of the hot-pressed recycled materials are significantly deteriorated compared to those of conventional raw materials. To enhance the properties of hot-pressed recycled materials

this paper proposes a method to increase the surface activity of epoxy resin pellets. Specifically

ball milling grafting was employed to modify the surface of recycled epoxy resin pellets via transesterification

thereby improving their thermal

mechanical

and electrical properties. The modified materials were characterized using a laser particle size analyzer

infrared spectrometer

thermogravimetric analyzer

and wideband dielectric apparatus. The results indicated that hydroxyl groups were successfully introduced into the modified granules

leading to enhanced thermal stability in the physically hot-pressed regenerated material. Notably

the glass transition temperature (Tg) increased significantly to 99.3 ℃

representing a 17.5% improvement. Additionally

compared with unmodified recycled epoxy resin

the breakdown field strength and tensile strength increased by 8.7% and 23%

respectively

reaching 31.89 kV/mm and 43 MPa. The research of this paper can provide a new choice direction for environmentally friendly electrical equipment materials.