To improve the environmentally unfriendly disposal methods such as crushing and landfilling of epoxy resin electrical equipment,this study focuses on synthesizing monocyclic epoxy compounds from bio-based vanillin and epichlorohydrin.These compounds are then cured in situ with a diamine curing agent to form Schiff base structures,resulting in bio-based environmentally friendly epoxy insulation materials.The degradation rate of this bio-based epoxy resin is fastest in a 0.3 mol/50 mL hydrochloric acid mixed solvent(methanol/water is 6/4,v/v,80 C),with complete degradation achievable within 40 minutes.The glass transition temperature of the regenerated epoxy resin particles,crushed to 0.5 mm,is 114.86 ℃ at 140 ℃ and 5 MPa pressure,with a retention rate of 95％.The breakdown field strength is 44.08 kV/mm with a retention rate of 98％,and it can completely degrade in a weak acid environment.After the epoxy resin is ground into fine particles after retirement,it can be regenerated and performs well under high temperature and high pressure environments.
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