| With the stricter requirement of enviromental protection,the epoxy resin system which is non-VOC or low VOC and low HAP has been paid more attention to, and the study on waterborne epoxy resin system has been a popular topic.The waterborne epoxy resin system which is emulsified by curing agent is studied in our research. A kind of polyamine curing agent modified by epoxy resin is synthesized ,which can be dissolved in water and can well emulsified epoxy resin. In our research, the curing agent is synthesized with E-51 epoxy resin and a -methylacrylic acid in water phase, the product doesn't need segregate. Through this method ,the original process can be simplified, in which great amount polyamine is required and the extra must be removed by means of vacuum equipment and the product must be treated by terminated agent. By doing so energy and raw materials can be saved.On the basis of the preparation of curing agent, by the means of infrared spectral analysis and differential scanning calorimeter (DSC), the structure of curing agent, the reactivity of the waterborne epoxy resin and the characteristics of the cured product were investigated. It is shown that the structural formula is polyamine terminated epoxy resin and the curing mechanism is step-growth addition polymerization. The proportion of the curing agent and E-51 epoxy resin is equivalent. In the pratical application ,the range of ratio is more widely, and the optimum ratio is 10:7.2.The admixture of the curing agent and E-51 epoxy resin can be cured in moderate temperature, the sheer stress of the bonded sample (the adherend is steel flake) is 19.8 MPa, which is correspond with homogeneous system which is dispersed in organic solvent. On the basis of study on adhesive characteristic,the feasibilities of the waterborne epoxy resin system used as composite materials and coating were studied . |
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