Abstract
Water transport properties have been studied in coating systems based on aliphatic and acrylic polyurethane resins, containing two different concentrations of the red and micaceous types of iron oxide. These tests were carried out on samples of the material prepared by casting, new and aged by UV radiation. The effects of aging were evident in all the systems. The results of altering the pigment concentration and the type of iron oxide used are also presented, showing the ideal concentrations for each type of pigment. Dispersion and distribution of pigments were analyzed by scanning electron microscopy (SEM) in all the systems, and the results compared with the water transport data.
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