Synthesis method of fluorescent water-based polyurethane

The invention relates to the field of chemical engineering, and discloses a synthesis method of fluorescent water-based polyurethane. The synthesis method comprises the steps: dispersing a self-made hydroxyl-terminated fluorescent composite material in aliphatic diisocyanate, performing mechanical stirring for a reaction at 40 DEG C for 1 hour, adding oligomeric diol and a hydrophilic chain extender, performing a stepwise polymerization reaction at 85 DEG C for 0.5-2 hours so as to synthesize a fluorescent water-based polyurethane prepolymer with carboxyl-containing side chains, performing cooling to room temperature, adding a small-molecule polyamine neutralizer to neutralize carboxyl groups so as to form quaternary ammonium salts, and after self-emulsification dispersion in metered water, then adding a small-molecule diamine chain extender for chain extension so as to obtain the fluorescent water-based polyurethane emulsion. Fluorescent functional groups are embedded into a water-based polyurethane skeleton