Colloidal Properties of Polychlorotrifluoroethylene-Based Multicomponent Dispersions

A polychlorotrifluoroethylene-based multicomponent dispersion in dimethylformamide (DMF) was used to prepare protective polymer coatings by the electrodeposition method. The properties of the fluoroplastic coatings were modified by the addition of a cationic polyelectrolyte and pigments of different natures to the dispersion, the pigments being codeposited on a cathode together with the fluoroplastic particles. The optimal composition of the dispersion was determined. It was found that all dispersion components were wetted by DMF; the surface properties of the coatings depended on the concentration of the polyelectrolyte added to the dispersion. The polyelectrolyte adsorption on F-3 and pigment particles was estimated by the UV spectroscopy; the electrokinetic potential of the particles was measured. The charge on a particle surface increased the dispersion stability, thus facilitating the formation of a more uniform electrodeposited layer, i.e., the coating.