THE STUDY OF THE PROCESS OF DISPERSING THE ORGANIC PIGMENT IN ALKYD–URETHANE FILM– FORMING

This paper presents the results of experimental studies of the patterns of development of the processes of disaggregation of the pigment “organic red” in an alkyd–urethane film–forming film in the presence of a surfactant — aminoalkylphenolethoxylate fatty acid derivative. With the help of the author's application to the computer–micro–optical method for analyzing the suspensions under study, the differential distribution curves for the fraction of solid–phase particles in a dispersion medium were obtained in the automatic mode. The dispersing role of diphilic molecules of alkyl alkyl phenol ethoxylate fatty acid derivative with respect to solid– state organic pigment in a solution of uralkide has been proven. A comparative analysis of the disaggregating activity of the modifier in the solvent and in the dispersing medium of the film–forming agent is given. A narrow concentration range of the modifying additive was identified, providing the maximum degree of disaggregation of solid– phase organic pigment particles (maximum number of particles; minimum average statistical diameter; change in fractional composition). According to the results of the study, the composition of paint and varnish compositions was optimized (CSAS = 2– 4%), which will improve the protective, structural– mechanical and decorative characteristics of the coatings formed on their basis.

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