Journal
PROGRESS IN ORGANIC COATINGS
Volume 95, Issue -, Pages 120-126Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2016.03.009
Keywords
Polyisocyanates; Polyurethanes; Hydrotalcites; Delamination; Powder coatings
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In this study, polyurethane powder clear coating systems consisting of polyester resin, blocked polyisocyanate and hydrotalcites (HT) intercalated with carbonate, aminododecanate, and ethylenedi-aminetetraacetate were examined. The blocked polyisocyanate crosslinkers for powder coatings were synthesized using trimethyhexamethylene diisocyanate (TMDI), formic acid, epsilon-caprolactam, dibutyltin dilaurate and triethylamine as catalysts. The powder coatings were investigated by atomic force microscopy (AFM) and X-ray diffraction analysis (XRD). The surface structure was correlated with the chemical structure of the coatings and macroscopic surface behavior: contact angle, surface free energy, gloss, elasticity, cupping, impact and scratch resistance, hardness as well as adhesion to steel surface. (C) 2016 Elsevier B.V. All rights reserved.
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