| 摘要 |
Disclosed is a polyurethane powder coating composition which comprises (I) a solid polyaddition compound containing a uretdione group, obtained by reacting A) 40-80% of a polyisocyanate component composed of 1. 40-100% of a polyisocyanate compound containing a uretdione group and having an average functionality of at least 2 and 2. 0-60% of a diisocyanate compound or an isocyanurate compound without uretdione groups, B) 60-10% of dodecane-1,12-diol and C) 50.0% of another hydroxy group-containing compound, (II) an OH-containing polymer and (III) a catalyst that is a metal acetylacetonate, metal hydroxide, metal alkoxide or a quaternary ammonium salt having a hydroxy, fluorine or carboxylate anion. The polyurethane powder coating cures at a low temperature and forms a paint film which has high gloss or matt and is light- and weather-stable.
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