▎ 摘　　要

NOVELTY - Process for preparing an antimicrobial coating composition, comprises (a) providing an aqueous dispersion comprising graphite, at least one oxidizing agent and optionally at least one antimicrobial agent, (b) subjecting the aqueous dispersion from step (a) to high shear homogenization by mixing the dispersion at a mixing speed of ≥ 1000 rpm to obtain an antimicrobial aqueous dispersion comprising graphene oxide, and (c) mixing the aqueous antimicrobial dispersion comprising graphene oxide with at least one film-forming agent to obtain the antimicrobial coating composition, where the film-forming agent is apt to promote the formation and adhesion of coating film of the composition on the surface of a substrate. USE - The process is used for preparing an antimicrobial coating composition, which is used for imparting antimicrobial properties to the surface of substrate (claimed). ADVANTAGE - The antimicrobial coating composition has a more effective and prolonged antimicrobial action over time than the existing compositions, has antimicrobial efficacy against a wide range of microorganisms, and can be prepared easily, quickly and economically. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for imparting antimicrobial properties to the surface of a substrate comprising depositing the antimicrobial coating composition on at least one surface of a substrate and evaporating the liquid phase of the coating composition to obtain an antimicrobial coating film adhering to the surface of the substrate.