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Influence of Filling on Water Uptake of Films Based on Water-Borne Coating Materials

Ivan Kas’yanenko, Halyna Neskorozhena, Viktor Kramarenko
National Technical University “Kharkiv Polytechnic Institute”, 2, Kyrpychova St., 61002 Kharkiv, Ukraine
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The effect of filling on water uptake has been studied for coatings based on aqueous dispersion Acronal-290D and pigment part consisting of titanium dioxide and calcium carbonate. It was found that an increase in the pigment volume concentration is accompanied by an increase in the rate of water absorption, but the maximum value of water uptake is characterized by a minimum near the critical pigment volume concentration. It was shown that at a low degree of filling of the films, water absorption is a long-term process, the kinetics of which can be described by superposition of two functions that take into account both the Fickian character of water diffusion and the relaxation process, associated with structural changes in the samples.

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