Study of paint and varnishes systems structuring in the presence of surfactants

Abstract

Introduction of surfactants in paintwork materials composition is one of the effective ways to improve their quality. It is obvious that introduction of surface-active additives in coating compositions changes not only the dispersity of the pigments and fillers included into the composition, but also the nature of the adsorption and intermolecular interactions in the system. With the help of low-frequency dielectrometry, a physical grid of intermolecular bonds was detected in the process of its formation. The regularities of the structurization of amines and polyphenylsiloxane in solutions of toluene were established by viscosimetric method. According to the results of viscosimetric analysis, the regularities of surface tension change for polyphenylsiloxane solutions were revealed: as the concentration increases from 0 to 2 g/dm3, the surface tension decreases from 28 to 26 mJ/m2. Rheological data showed that deviations from the ideal system exist in the region of the studied concentrations, i.e., there is an association of molecules of the amino derivatives with macromolecules of polyphenylsiloxane (heteroassociation). It is proved that formation of macromolecular structures is inherent in all three varieties of amines and is substantially enhanced in concentrated solutions.