Abstract
This research presents the effect of the chemical structure of new crosslinking agent on the properties of powder coatings. A method of synthesis of blocked polyisocyanates and the formation of powder coatings with low curing temperature are presented. In the synthesis of blocked polyisocyanates (bPIC) TDI, glycerine, xylitol, polyethylene glycol, polysiloxane KF-6000 and butanone oxime were used. By using FT-IR, the chemical structure of the obtained blocked polyisocyanates was confirmed. The thermal behavior and the deblocking process were investigated by means of TGA, DSC and DMA. Performance tests were performed on the obtained coatings to assess their hardness, adhesion to steel, roughness, gloss, scratch resistance, and water contact angle. An accelerated weathering test was also conducted to examine the coatings' resistance to weather conditions (UV radiation, water).
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