Study on Preparation and Performance of Waterborne Epoxy Resin and Its Curing Agent

Abstract: In this paper, a kind of self-emulsifiable epoxy resin was synthesized and a stable waterborne epoxy emulsion was prepared firstly. The influences on the centrifugal stability of the emulsion of molecular weight, proportion of epoxy resin, reaction temperature, and feeding processes were investigated. The reactive products were characterized by FTIR, and results show that the structures of the modified epoxy resin are just the designed form. By the phase inversion technique, the average particle sizeis of our emulsion can reach about 569.7 nm and has good centrifugal stability, 3000r/min,without settings within 30min.Secondly, a new self-emulsified waterborne epoxy curing agent was synthesized from diethylene triamine (DETA), epoxy resin, and et al. The parameters of process, including reaction temperature, reaction time, ratio of reaction materials were determined. These synthesized waterborne epoxy curing agent also can emulsify epoxy resin, and the particle size of emulsion is about 2476.9 nm.Thirdly, the clear films were prepared by the stable waterborne epoxy emulsion and the self-emulsified waterborne epoxy curing, its mechanical and hydrophilic properties were investigated, and the influences factors were also studied. Moreover, the mechanical property of clear film was investigated compared with pure epoxy resin, foreign similar product. The other properties of the clear films also have been observed by SEM, TG and DSC test.Lastly, the waterborne epoxy coating were studied by the influences of pigment volume concentration (PVC) on the routine properties, mechanical property and hydrophilic property. The anti-corrosion property of paint film have been carried out by Electrochemical Impedance Spectroscopy (EIS) and Dynamic Thermomechanic Analysis (DMA) methods…
Key words: epoxy emulsion; waterborne curing agent; chemical modification; self-emulsifiable

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