Methods for the synthesis of urethane acrylates used as new crosslinking agents for hydrophobic UV-curable powder clear coatings were developed. In the synthesis of urethane acrylates, isophorone diisocyanate, glycerin, xylitol, polyethylene glycol and polysiloxane KF-6000, as well as 2-hydroxyethyl acrylate or 2-hydroxyethyl methacrylate, were used. In order to increase the functionality of urethane acrylates, glycerin and xylitol derived from renewable sources were introduced. The chemical structure of the urethane acrylates was verified by IR spectroscopy. UV-curable powder clear coatings were obtained through a combination of urethane acrylates with unsaturated polyester resins. The thermal behavior and crosslinking density were examined using DMA. The obtained coatings were evaluated by performing the following tests: roughness, gloss, scratch resistance, hardness, adhesion to steel and water contact angle. As part of this research, high hydrophobicity and scratch resistance of UV-curable powder clear coatings were developed, which are a VOC-free and economically attractive alternative method for low thermal resistance surface protection, such as for composites, wood and wood-based materials.

In this study, low temperature powder coatings based on acrylic resin were developed. Acrylic resins were synthesized using 2-hydroxyethyl methacrylate (HEMA), methyl methacrylate (MMA) and n-butyl acrylate (BA). Butanone oxime (MEKO) blocked polyisocyanates was chosen as crosslinking agents. The coatings were cured at 160 degrees C. The influence of the acrylic resin structure on the physical-mechanical properties such as roughness, gloss, adhesion to steel surface, hardness, scratch resistance, contact angle and liquid resistance was investigated. These results were compared with the polyurethane powder coatings based on polyester resin Sirales PE 6110 was investigated. The protective properties of polyurethane powder coatings based on acrylic resin were tested by the immersion in a 3.5% NaCl solution and by the electrochemical impedance spectroscopy (EIS) method. The coatings manufactured based on the acrylic resin had better resistance to water, mechanical damage and corrosive media than those produced using commercial polyester resin.

W ramach badań opracowano nowe środki sieciujące o strukturze rozgałęzionych blokowanych poliizocyjanianów, zawierające glicerynę, ksylitol, glikol polietylenowy lub polisiloksan KF 6000 do niskotemperaturowych poliuretanowych lakierów proszkowych. Jako środek blokujący zastosowano oksym acetonu. Wytworzone z ich udziałem lakiery utwardzają się w temperaturze 150oC. Zbadano wpływ struktury chemicznej blokowanych poliizocyjanianów na właściwości fizyko-mechaniczne (połysk, chropowatość, odporność na zarysowanie, twardość, pomiar kąta zwilżania) i ochronne poliuretanowych powłok proszkowych. Wykonano pomiary EIS oraz badania odporności na korozję w 3,5 % roztworze NaCl.