基于亚胺键的环保型环氧树脂的制备与再生

Preparation and Regeneration of Environmentally Friendly Epoxy Based on Imine Bond

为改善环氧树脂电气设备粉碎、填埋等不环保的处理方式的现状,以生物基香草醛与环氧氯丙烷合成单环氧化物,并与二胺固化剂固化原位形成亚胺键结构,得到生物基环保环氧绝缘材料。该生物基环保环氧树脂在0.3 mol/50 mL盐酸混合溶剂(甲醇与水的体积比为6∶4,80℃)时降解速度最快,在40 min内能完全降解。由0.5 mm粉碎颗粒在140℃、5 MPa压力下再生的环氧树脂玻璃化转变温度为114.86℃,击穿电场强度为44.08 kV/mm,性能保持率达到95%,并且可以在在弱酸环境中完全降解。退役后的环氧树脂粉碎为细小颗粒后,在高温高压的环境下能再生且性能良好。

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℃),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.