▎ 摘　　要

NOVELTY - Preparation of graphene/aqueous polyurethane nanocomposite comprises vacuum dehydrating polyether polyol (N210), adding toluene diisocyanate, mixing, reacting at 75-85 degrees C for 2-3 hours to obtain prepolymer, adding dihydroxy acid, reacting for 3-5 hours, cooling to 50 degrees C, diluting with acetone, adding triethylamine, stirring for 20-30 minutes, adding graphene oxide solution, high-speed stirring, adding deionized water and ethylenediamine, emulsifying for 1-2 hours, distilling off acetone, cooling to 50-90 degrees C, adding vitamin C solution and drying at 80-100 degrees C. USE - Method for preparing graphene/aqueous polyurethane nanocomposite (claimed). ADVANTAGE - The method is simple, environment-friendly and suitable for mass production. The nanocomposite can be applied to electrostatic protection, anti-corrosion coating and architectural coating. DETAILED DESCRIPTION - Preparation of graphene/aqueous polyurethane nanocomposite comprises vacuum dehydrating polyether polyol (N210) with average molecular weight of 1000, adding toluene diisocyanate, mixing, reacting at 75-85 degrees C for 2-3 hours to obtain prepolymer, adding dihydroxy acid, reacting for 3-5 hours, cooling to 50 degrees C, diluting with acetone, adding triethylamine, stirring for 20-30 minutes, adding graphene oxide solution, high-speed stirring, adding deionized water and ethylenediamine, emulsifying for 1-2 hours, distilling off acetone under reduced pressure, cooling to 50-90 degrees C, adding vitamin C solution for in situ reduction to obtain nanocomposite emulsion and drying at 80-100 degrees C to obtain nanocomposite solid with 0.1-1 wt.% graphene. The mole ratio of toluene diisocyanate, polyether polyol (N210), dihydroxy acid, triethylamine and ethylenediamine is 2:1:0.6:0.6:0.32.