The Effect Of Ils On Degradation Behavior Of Epoxy Resin In Nearcritical Water

With the accelerating of technological development, epoxy resins are widelyused. At the same time, this kind of wastes are rapidly increased. Treatment andrecycling of this kind of wastes properly have been laid store by researchers all overthe world.In this paper, the decomposition behavior of two bisphenol A type epoxy resinscured with MeTHPA and TETA in nearcritical water is studied. The effects of theexperimental parameters,including temperature, time, the species and amount ofionic liquids （ILs） on the percentage of decomposition were investigated. Theresults revealed that the percentage of decomposition can be enhanced by increasingeither temperature or reaction time.[Bmim]BF₄and [Bmim]Cl/χZnCl₂（χ=0.67） canimprove the decomposition rate of the two kinds of epoxy resins., and[Bmim]Cl/χZnCl₂（χ=0.67） was more efficiently.The main decomposition products from the epoxy resin were identified bymeans of GC/MS. Based on products distribution, the reaction mechanism for thedecomposition of epoxy resin was proposed. The decomposition mechanisms ofE-51/MeTHPA and E-51/TETA are envisaged as the ether and crosslink bondscracking. It was H+and water as a Hydrogen Source can participate in elementaryreaction steps as catalysts. The addition of ILs can change the path ofdecomposition reaction.[Bmim]BF₄can accelerate the scission of ether bond of E-51/MeTHPA andE-51/TETA, while [Bmim]Cl/χZnCl₂（χ=0.67） can accelerate the scission ofcrosslink bond of E-51/MeTHPA.The kinetics study of the epoxy decomposition was also carried out and thedecomposition equation was established. The order of reaction was between0～1innearcritical water. But the addition of [Bmim]BF₄made the order equal to0approximately.