Facile recycling of anhydride-cured epoxy thermoset under mild conditions with multifunctional hydrazine hydrate  

作　　者：Beitao Liu Qi Cao Jiahui Li Xigao Jian Zhihuan Weng 

机构地区：[1]State Key Laboratory of Fine Chemicals,Frontiers Science Center for Smart Materials,Liaoning Technology Innovation Center of High Performance Resin Materials,Departmentof Polymer Science&Engineering,Dalian University of Technology,Dalian 116024,China

出　　处：《Chinese Chemical Letters》2023年第12期231-235,共5页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52073038 and 51873027);the Fundamental Research Funds for the Central Universities(Nos.DUT20TD114 and DUT22LAB605).

摘　　要：Environmental economics is accelerating the urgency to develop recycling technologies for the ever-growing quantity of discarded thermoset polymers.Herein,we developed a mild and energy-saving pro-cess for high-eficiency degradation and reuse of anhydride-cured epoxy thermoset with the aid of hy-drazine hydrate.The degradation degree of the epoxy resin reached 99.6%at 120℃ within a short time of 60min.During the reaction,the ester bonds in the cross-linked network were selectively cleaved by the amination of hydrazine hydrate,and the epoxy resin was fully converted to new monomers that con-tained hydrazide and hydroxyl groups,respectively.Moreover,the degradation mechanism of the epoxy resin in hydrazine hydrate was studied and a nucleation model was utilized to predict the actual degra-dation behavior of the system.Finally,the degradation products can be directly mixed with epoxy precur-sor to prepare a new waterborne epoxy coating with good comprehensive properties.This work not only demonstrates a new way to realize the efficient degradation of epoxy resins,but also provides a facile and efficient recycling protocol for thermosets.

关 键 词：Anhydride-cured epoxy resin Degradation RECYCLING Erosion mechanism Waterborne epoxy coating 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]