▎ 摘　　要

NOVELTY - A multifunctional modified aqueous polyurethane coating material contains diisocyanate, polyether polyol, hydrophilic chain extender, phosphorus-nitrogen synergistic flame retardant, neutralizing agent and graphene oxide in a mass ratio of 11-19:12-26:2-3:2.5-12.5:1.8-2:0.2-1. USE - Multifunctional modified aqueous polyurethane coating material (claimed). ADVANTAGE - The multifunctional modified aqueous polyurethane coating material has excellent storage stability, mechanical properties, heat resistance, corrosion resistance and low viscosity, and can be prepared in simple and economical manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of multifunctional modified aqueous polyurethane coating material, which involves weighing raw materials and then uniformly mixing, and reacting.