Study on Catalytic Degradation and Recycling of Thermosetting Epoxy/Amine Cured Esters
The three-dimensional cross-linking structure of thermosetting epoxy resins makes them insoluble and infusible,which makes recycling difficult.Ester epoxy was selected as the epoxy matrix and amine as the curing agent,and ethylene glycol was used to degrade the cured material under atmospheric pressure.The catalytic degradation effect of various catalysts,such as metal zinc salts and organic bases on the epoxy/amine cured material and the recycling effect of the epoxy degradation products were investigated.The results show that ethylene glycol can completely degrade the epoxy/amine cured esters.The complete degradation time is 365 min using 5％zinc acetate as a catalyst,which is 135 min less than that of the system without a catalyst.The degradation products are added to the original epoxy/amine system in the proportion of 10％by mass,the thermal stability is maintained well,the elongation at break is increased by 39％,and the tensile strength is slightly decreased but still maintains a high level.The tensile strength has slightly decreased but still maintains a high strength.The catalyst can increase the degradation rate of thermosetting epoxy resins,and the degradation products can be added to the original epoxy/amine system in a certain proportion to achieve recycling.
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