▎ 摘　　要

NOVELTY - Producing powder coating composition comprises (a) performing dispersing treatment by adding 85-89 pts. wt. carboxy group-containing polyester resin and 6 pts. wt. β -hydroxyalkylamide in a grinder having weight average molecular weight of 9500-9700; (b) preparing rice straw-derived graphene; (c) adding 1.2-1.3 pts. wt. rice straw-derived graphene, 3 pts. wt. butyltriphenylphosphonium chloride and 3 pts. wt. additives into the dispersion treated product prepared in step (a); (d) adding the secondary dispersion-treated product prepared step (c) into melt extruder and melt-processing at 90° C; and (e) preparing powder coating composition by cooling and pulverizing the molten processed material prepared in step (d). The step (b) comprises e.g. (b1) hydrolyzing the rice straw using sulfuric acid at 85° C for 8-10 minutes, and (b2) adding mixed treatment agent containing calcium hydroxide and magnesium sulfite at 110° C to the hydrolysis product prepared through step (b1). USE - The coating composition is useful in electrostatic powder coating (claimed) for electric power equipment and electronic products. ADVANTAGE - The coating composition minimizes risk of ignition during the use of powder coatings and prevent fire or explosion accidents; and has excellent physical properties i.e. impact resistance, boiling water resistance, cathode peelability, and weather resistance. DETAILED DESCRIPTION - Producing powder coating composition comprises (a) performing dispersing treatment by adding 85-89 pts. wt. carboxy group-containing polyester resin and 6 pts. wt. β -hydroxyalkylamide in a grinder having weight average molecular weight of 9500-9700; (b) preparing rice straw-derived graphene; (c) adding 1.2-1.3 pts. wt. rice straw-derived graphene, 3 pts. wt. butyltriphenylphosphonium chloride and 3 pts. wt. additives into the dispersion treated product prepared in step (a); (d) adding the secondary dispersion-treated product prepared step (c) into melt extruder and melt-processing at 90° C; and (e) preparing powder coating composition by cooling and pulverizing the molten processed material prepared in step (d). The step (b) comprises (b1) hydrolyzing the rice straw using sulfuric acid at 85° C for 8-10 minutes, (b2) adding mixed treatment agent containing calcium hydroxide and magnesium sulfite at 110° C to the hydrolysis product prepared through step (b1), bleaching at 80° C for 3 hours using hydrogen peroxide, (b3) obtaining an intermediate product derived from rice straw by catalyzing and drying the bleached product prepared through step (b2) by using nickel chloride, (b4) performing primary heat treatment of the intermediate product derived from rice straw prepared in step (b3) at 400-450° C for 6 hours in an oxygen-free environment, performing secondary heat treatment at 600-650° C for 3 hours, and then cooling to ≤ 40° C, and (b5) preparing rice straw-derived graphene by washing and drying the intermediate product derived from rice straw in step (b4). DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart illustrating the method for producing powder coating composition (Drawing includes non-English language text).