The invention specifically relates to hydroxy
polyester resin for a high-gloss
powder coating, a preparation method thereof and application of the hydroxy
polyester resin to
powder coatings, belongingto the technical field of
powder coatings. The hydroxy
polyester resin for the high-gloss
powder coating is prepared through
polymerization of the following raw materials:
terephthalic acid, 6-
aminocaproic acid, domoic acid, 3,6-dithia-1,8-octanediol, 2-propenoic acid-2,18-dihydroxy-4,7,10,13,16-pentaoxanonadecane-1,19-diyl ester,
neopentyl glycol, 3-(2,3-epoxypropoxy)propyl trimethoxy
silane and3,5-di-tert-butyl-4-hydroxybenzyl
alcohol. It has been determined that the obtained hydroxy
polyester resin has good melt fluidity at 200 DEG C, low
melt viscosity and long leveling time, and allowsa film to have high gloss. The hydroxy
polyester resin is eventually applied to the
powder coating cured by
polyurethane B1530, can improve the surface gloss of the
coating, and allows a coated boardsurface with high gloss to be obtained.