Study of the decorative properties of coatings obtained by dry blending of powder paints based on polyester resins

Coatings obtained by the dry blending method of powder paints based on carboxy-functional polyester resins and hardeners (triglycidyl isocyanurate and hydroxyalkylamide) were studied. The chemical composition of the film-forming agents was confirmed by IR spectroscopy. The glass transition temperature, acid number, and gel time were determined by differential scanning calorimetry, titration, and gel testing, respectively. It was shown that coatings based on individual resins with hardeners are characterized by high gloss and low roughness. When dry blending powder paints based on different resins and hardeners, coatings with reduced gloss (from matte to semigloss) and increased roughness were obtained, which is due to the incompatibility of the components and different curing kinetics. The dry blending method demonstrated the possibility of creating coatings with varying degrees of gloss and surface structure as an alternative to the use of special additives.

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