Silicone-acrylic hybrid aqueous dispersions of core–shell particle structure and corresponding silicone-acrylic nanopowders designed for modification of powder coatings and plastics. Part III: Effect of modification with selected silicone-acrylic nanopowders on properties of polyurethane powder coatings

0439613 - ÚMCH 2016 RIV NL eng J - Journal Article
Pilch-Pitera, B. - Kozakiewicz, J. - Ofat, I. - Trzaskowska, J. - Špírková, Milena
Silicone-acrylic hybrid aqueous dispersions of core–shell particle structure and corresponding silicone-acrylic nanopowders designed for modification of powder coatings and plastics. Part III: Effect of modification with selected silicone-acrylic nanopowders on properties of polyurethane powder coatings.
Progress in Organic Coatings. Roč. 78, January (2015), s. 429-436. ISSN 0300-9440. E-ISSN 1873-331X
Institutional support: RVO:61389013
Keywords : polyurethanes * powder coatings * blocked polyisocyanates
Subject RIV: CD - Macromolecular Chemistry
Impact factor: 2.632, year: 2015

Polyurethane powder coating systems consisting of polyester resin, blocked polyisocyanate and two types of “nanopowders” containing core–shell nanoparticles where the core was silicone resin of very low glass transition temperature and the shell was poly(methyl methacrylate) were examined. The blocked polyisocyanate was synthesized using biuretpolyisocyanate obtained from ureapolyisocyanate as starting material capable for blocking and ɛ-caprolactam as blocking agent. The surface properties of cured powder coatings were investigated using scanning electron microscopy (SEM) combined with energy dispersive spectrometry (EDS), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The surface structure was correlated with the chemical structure of the coatings and macroscopic surface behavior: contact angle, surface free energy, gloss, abrasion resistance, hardness and adhesion to the steel surface.
Permanent Link: http://hdl.handle.net/11104/0244670