Heat-curable powder coating composition and preparation method thereof

Abstract

The invention relates to the field of powder coatings, and specifically discloses a heat-curable powder coating composition and a preparation method thereof. The powder coating composition comprises: i) component A comprising at least one amorphous solid polyester resin compound having a Michael donor reactive group; ii) component B comprising at least one amorphous ethylenically unsaturated solid polyester resin with a Michael acceptor reactive group; iii) component C comprising at least one (semi) crystalline solid reactive diluent; iv) component D comprising at least one epoxy group-containing solid substance; v) component E comprising at least one basic catalyst. The present invention also discloses a preparation method of the above heat-curable powder coating composition. By adopting the invention, ultra-low temperature curing can be realized. The curing temperature is as low as 90-110° C., and the curing time is short.

Dependencies are inferred from the claim text.