Preparation and Characterization of Polysiloxane Modified Epoxy Resin Aqueous Dispersions of Their Films

Polysiloxane modified epoxy resin aqueous dispersions were prepared by in-situ dispersing waterborne graft epoxy resin with amino-polysiloxane microemulsion.Properties of the modified aqueous dispersions and their films were studied.The modification resulted in dispersions of smaller particles,broader ranges of particle size,and higher viscosity.Observations by TEM(transmission electon(microscopy)) showed that polysiloxane was wrapped by the epoxy resin to form a "core-shell" structure.The water and oil repelleycy as well as the heat resistance of the modified film were significantly improved;the surface energy of the films was lowered.TEM photographs of the modified films suggested that the polysiloxane particles reoriented and migrated to the film surface during the film formation.Results of(ATR)(attenuated total refraction) and FT-IR(Fourier transform infrared) spectrum measurements confirmed the enrichment of polysiloxane on the modified surface film.