▎ 摘　　要

NOVELTY - Preparation of nano composite material comprises ultrasonic dispersing metal porphyrin compound in solvent to obtain first solution; ultrasonically dispersing graphene oxide in solvent; slowly adding first solution, stirring, adding clarification solution, centrifuging, washing precipitate using solvent, washing with water, and vacuum drying; and adding distilled water, stirring, ultrasonic dispersing, reducing, cooling to room temperature, centrifuging, water washing, and vacuum drying. USE - Method for preparing nano composite material used for preparing coating composition (claimed). ADVANTAGE - The composite material has infrared absorption function, multi-wave band and wide frequency band. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for coating composition comprising 20-30 pts. wt. water, 15-20 pts. wt. nano composite material, 20-30 pts. wt. attapulgite, 1-2 pts. wt. cellulose derivative, 20-30 pts. wt. inorganic phosphate, 0.5-1 pt. wt. dispersant, and 1-2 pts. wt. defoamer.