▎ 摘　　要

NOVELTY - Preparation of cationized ferrite aqueous dispersion involves preparing graphene derivative dispersion containing an active functional group at the edge, adding graphene derivative dispersion to a reactor, mechanically stirring, adding diisocyanate, reacting under nitrogen protection atmosphere, such that diisocyanate is reacted with the active functional group of the graphene dispersion, adding a salt-forming monomer containing a tertiary amine and an active hydroxyl group, reacting, adding organic acid, reacting, and dispersing obtained cationized graphene in an aqueous solution. USE - Preparation of cationized ferrite aqueous dispersion used in cathodic electrodeposition coating (claimed) and cationic aqueous coating. ADVANTAGE - The method enables preparation of cationized ferrite aqueous dispersion with excellent stability, by simple process. The cationized ferrite aqueous dispersion is stored at room temperature for 15 days without sedimentation. DETAILED DESCRIPTION - Preparation of cationized ferrite aqueous dispersion involves adding graphite to 1-5 %mass strong alkaline solution, mechanical stirring, ultrasonically processing at 100-500 W for 30-90 minutes, filtering, washed filtrate with deionized water until the filtrate is neutral, vacuum-drying, obtaining pre-treated graphite, adding pre-treated graphite to a hydrothermal reactor, adding Lewis acid catalyst and benzoic acid derivative, reacting at 80-220 degrees C for 24-48 hours under nitrogen protection atmosphere, cooling reaction mixture to room temperature, washing filtrate several times with deionized water until filtrate is neutral, adding obtained product to a Soxhlet extractor, adding organic alcohol having less than 8 carbon atoms, extracting at 60-90 degrees C for 8-24 hours, adding a polar solvent, ultrasonically processing at 100-550 W for 30-180 minutes, obtaining graphene derivative dispersion containing an active functional group at the edge, adding graphene derivative dispersion to a reactor, mechanically stirring for 30-60 minutes, adding diisocyanate in an amount of 1-10 wt.% with respect to graphene derivative, reacting at 50-120 degrees C for 6-36 hours under nitrogen protection atmosphere, such that diisocyanate is reacted with the active functional group of the graphene derivative dispersion, adjusting reaction temperature to 55-85 degrees C, adding a salt-forming monomer containing a tertiary amine and an active hydroxyl group, reacting in nitrogen atmosphere for 6-12 hours, adding organic acid in an amount of 60-100% with respect to the salt-forming monomer, reacting at 40-80 degrees C for 1-8 hours, and dispersing obtained cationized graphene in an aqueous solution. An INDEPENDENT CLAIM is included for usage of cationized ferrite aqueous dispersion in cathodic electrodeposition coating.