Stability and Structural and Rheological Properties of Epoxy Emulsions. Stabilization of Emulsions by Polymer Microparticles

It has been shown that emulsifiers of Emulsogen LCN-287 and OS-20 grades are the most effective for preparing ED-20 resin-based emulsions and the emulsifier Emulsogen LCN-287, for preparing resins NPEL 127, NPEL 128, CHS-EPOXY 520, CHS-EPOXY 530. The optimum concentration of resins in emulsions is 60 wt % and the optimum concentration of emulsifiers Emulsogen LCN-287 and OS-20 is 1x10(-2) and 5x10(-3) M, respectively. The prepared emulsions are polydisperse (0.1-250 mu m, the predominant fraction is 0.1-5 mu m) and are characterized by relatively low stability (no more than 7-12 days), the time of their complete settling is 10-20 days. It was found that ED-20 resin and H2O-ED-20 system emulsions are structured non-Newtonian liquid-like systems, the studied imported resins are Newtonian fluids, and emulsions based on them are non-Newtonian fluid. The presence of polymer microparticles improves the stability of emulsions during storage. The most stable are emulsions stabilized with an aqueous acrylic-methacrylic polymer dispersion.