▎ 摘　　要

NOVELTY - Preparing flame-retardant self-repairing aqueous polyurethane composite coating agent, comprises (1) dissolving the nanoparticles, adding a coupling agent to react, washing and drying to obtain aminated nanoparticles, (2) dissolving the aminated nanoparticles, adding hexachlorocyclotriphosphazene and diamine, adding an acid binding agent, feeding nitrogen to react to obtain hyper-branched polyphosphazene modified nano particles (HBPC), (3) mixing and reacting polyester diol, hydrophilic monomer and diisocyanate to obtain isocyanate group-terminated prepolymer solution, (4) adding a dynamic reversible covalent bond monomer, a dynamic reversible non-covalent bond monomer and hyper-branched polyphosphazene modified nano particles to prepolymer solution, and performing a chain extension reaction to obtain a chain extension product solution, and (5) adding a neutralizer to the chain extension product solution for reaction, cooling, adding water, stirring and emulsifying. USE - The method is useful for preparing flame-retardant self-repairing aqueous polyurethane composite coating agent, which is useful in the flame-retardant self-healing coating of wood lacquer (claimed). Can also be used in leather coating, building material and coating. ADVANTAGE - The prepared flame-retardant self-repairing aqueous polyurethane composite coating agent has hyper-branched and double reversible bond structure; can quickly and efficiently self-repair at high temperature, and can be applied to the coating of wood lacquer. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a flame-retardant self-repairing aqueous polyurethane composite coating agent.