Preparation and Regeneration of Environmentally Friendly Epoxy Based on Imine Bond
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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