▎ 摘　　要

NOVELTY - Preparing self-repairing graphene/polyurethane composite material e.g. comprises (i) preparing quadruple hydrogen bond basic polyurethane, (ii) preparing quadruple hydrogen bond basic oxidized graphene, and (iii) adding quadruple hydrogen bond basic polyurethane and quadruple hydrogen bond basic oxidized graphene into fourth solvent, stirring the mixture uniformly, and then pouring into mold, vacuum drying, and repairing graphene oxide/polyurethane composite material. USE - The method is useful for preparing self-repairing graphene/polyurethane composite material (claimed). ADVANTAGE - The method has simple preparation process and repair rate is up to 85%. DETAILED DESCRIPTION - Preparing self-repairing graphene/polyurethane composite material comprises (i) mixing polyester polyol or polyether polyol and chain extender and stirring, dehydrating, the temperature of less than or equal to 60 degrees C, adding polyisocyanate into the reaction system at 70-85 degrees C for 2-4 hours to obtain polyurethane prepolymer; firstly mixing 2-amino-4-carbonyl-6-methylpyrimidine with first solvent and stirring at 60-80 degrees C to completely dissolving 2-amino-4-carbonyl-6-methylpyrimidine, then adding polyurethane prepolymer and catalyst and reacting at 70-85 degrees C for 15-24 hours, then precipitating the resulting mixture with second solvent and filtering to obtain white solid, drying under vaccum to obtain quadruple hydrogen bond basic polyurethane, where the catalyst is organotin catalyst and/or tertiary amine catalyst and the chain extender is 1,4-butanediol, diethylene glycol and/or 1,4-cyclohexanediol, (ii) adding 2-amino-4-carbonyl-6-methylpyrimidine into polyisocyanate, reacting at 90-110 degrees C for 10-24 hours, cooling to room temperature and then filtering with third solvent, washing with third solvent, drying in vaccum to obtain isocyanate base element having quadruple hydrogen bond, then dispersing graphene oxide and isocyanate base element having quadruple hydrogen bond in third solvent, sonication to obtain homogeneous solution, then reacting the solution at 60-80 degrees C for 12-24 hours, centrifugal cleaning, vacuum drying to obtain quadruple hydrogen bond basic oxidized graphene, and (iii) adding quadruple hydrogen bond basic polyurethane and quadruple hydrogen bond basic oxidized graphene into fourth solvent, stirring the mixture uniformly, and then pouring into mold, vacuum drying, and repairing graphene oxide/polyurethane composite material. An INDEPENDENT CLAIM is also included for self-repairing graphene/polyurethane composite material obtained by above method, where the self-repairing rate of the composite material is 83-85 wt.% and the tensile strength of 1.2-1.3 MPa.