▎ 摘　　要

NOVELTY - Method for preparing self-healing waterborne polyurethane/reduced graphene oxide-polydopamine composite material, involves (a) reacting diisocyanate, macromolecular polyol and hydrophilic chain extender, adding small glycol molecules with Diels-Alder dynamic bond and continuously reacting, adding tri-isocyanurate crosslinker and reacting, cooling, adding triethylamine to neutralize, stirring emulsifier and dispersing in an aqueous solvent to obtain a self-repairing aqueous polyurethane, (b) ultrasonically dispersing reduced graphene oxide in tris-hydrochloride buffer, adding ethanol and stirring, adding dopamine hydrochloride and stirring, centrifuging, washing and freeze-drying to obtain final polydopamine attached to graphene oxide to obtain a modified graphene oxide graphene oxide modified with 3-aminopropyltriethoxysilane, and (c) adding polydopamine attached graphene oxide into the aqueous polyurethane and ultrasonically dispersing for 2 hours. USE - The method is useful for preparing self-healing waterborne polyurethane/reduced graphene oxide-polydopamine composite material as a metal anticorrosive coating (all claimed). ADVANTAGE - The coating is damaged and repaired, extends service life, has excellent anti-corrosion performance, heals wound by irradiating the wound with near-infrared light when is damaged, and realizes remote and fixed-point repair of material damage. DETAILED DESCRIPTION - Method for preparing self-healing waterborne polyurethane/reduced graphene oxide-polydopamine composite material, involves (a) reacting diisocyanate, macromolecular polyol and hydrophilic chain extender at 80 degrees C for 2 hours, adding small glycol molecules with Diels-Alder dynamic bond and continuously reacting for 2 hours, adding tri-isocyanurate crosslinker and reacting for 2 hours, cooling to 40 degrees C, adding triethylamine to neutralize, stirring emulsifier and dispersing in an aqueous solvent at high speed to obtain a self-repairing aqueous polyurethane, (b) ultrasonically dispersing reduced graphene oxide in tris-hydrochloride buffer with pH of 8.5, adding ethanol and stirring at room temperature for 30 minutes, adding dopamine hydrochloride and stirring for 24 hours at room temperature, centrifuging, washing with water and freeze-drying to obtain final polydopamine attached to graphene oxide to obtain a modified graphene oxide graphene oxide modified with 3-aminopropyltriethoxysilane, and (c) adding polydopamine attached graphene oxide into the aqueous polyurethane and ultrasonically dispersing for 2 hours.