▎ 摘　　要

NOVELTY - Conductive micro-capsule, is claimed. The conductive micro-capsule uses composite material of graphene and low-melting polyurethane as core material, amino resin as wall material, and conductive metal particles are deposited on surface, the melting point of low melting point polyurethane is 50-60 degrees C. USE - The conductive micro capsule is used as self-repairing material (claimed). ADVANTAGE - The conductive micro capsule: has good conductive self-repair function; and can repairs the microcracks of graphene conductive film, solves the problem of the decline of electrical performance of graphene conductive film, and extends the service life of material. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing the conductive micro-capsule comprising (1) melting and blending graphene and low-melting polyurethane uniformly according to the mass ratio (0.05-0.2):1, the melting point of the low-melting polyurethane is 50-60 degrees C, obtaining a composite material of graphene and low melting point polyurethane, (2) adjusting the pH value of the mixed aqueous solution of melamine and formaldehyde to 8-9, stirring at speed of 400-600 revolutions/minute at 60-80 degrees C until the solution becomes transparent to obtain a prepolymer solution, the mass ratio melamine and formaldehyde and water in system is 1:(1-3):(15-25), (3) stirring the graphene and low melting point polyurethane composite material and emulsifier at 60-80 degrees C for 0.1-1 hours, adding water and stirring and emulsifying for 5-20 minutes at speed of 10,000-20,000 revolutions/minute to obtain stable oil-in-water emulsion, the mass ratio of the composite material of graphene and low-melting polyurethane, emulsifier and water is 1:(0.02-0.1):(10-30), (4) adjusting the pH value of the oil-in-water emulsion obtained in step (3) to 4-5, slowly dropping the prepolymer solution obtained in step (2) into the emulsion while reducing the stirring speed to 100-200 revolutions/minute, after finishing dripping of prepolymer solution, keeping it at 60-80 degrees C for 2-4 hours, cooling, repeatedly washing obtained product with deionized water and petroleum ether for 2-5 times, suction filtering, and drying in vacuum to obtain micro capsules, and (5) blending the micro capsules obtained in the step (4), metal salt, reducing agent and water to form suspension, using a microwave reactor to perform liquid phase reduction reaction on the suspension, the microwave power is 500-1000 W, the microwave time is 5-15 minutes, after completing reaction, cooling and repeatedly washing the resulting product with deionized water and ethanol for 2-5 times, filtering and vacuum drying to obtain conductive micro capsules, the mass ratio of the micro capsules, metal salt, reducing agent, and water is 1: (0.5-2): (0.05-0.1): (50-150), the metal salt is at least one of silver acetate, silver nitrate, copper sulfate and copper acetate; (2) graphene conductive ink comprising 30-60 wt.% aqueous resin, 2-20 wt.% graphene, 1-5 wt.% conductive micro-capsule, 2-8 wt.% dispersant, 0.1-0.5 wt.% anti-foaming agent, 0.5-2 wt.% thickening agent, and 30-55 wt.% water; (3) self-healing graphene conductive film, the self-healing graphene conductive film is prepared by coating and curing the graphene conductive ink; and (4) self-repairing of graphene conductive film comprising heating the graphene conductive film to 50-80 degrees C and maintaining it for 1-3 hours when the electrical performance of graphene conductive film decreases.