▎ 摘　　要

NOVELTY - Preparation of graphene-copper composite material involves (1) mixing graphene dispersion with hydrofluoric acid solution, processing, obtaining hydrofluoric acid-treated graphene, (2) soaking the hydrofluoric acid-treated graphene in the aqueous solution of sodium hydroxide and sodium citrate, treating, obtaining processed graphene, (3) dispersing the processed graphene in deionized water to form a solution, adding titanate coupling agent, hydrazine hydrate, propylene glycol and cerium trifluoromethanesulfonate, obtaining solid phase, (4) mixing an aqueous solution of copper sulfate and 2,2-bipyridine, and an aqueous solution of disodium edetate and potassium sodium tartrate, adding the aqueous formaldehyde solution, the aqueous methanol solution and the aqueous sodium nitrate solution, obtaining plating solution, pouring the solid phase into the plating solution, stirring, drying, obtaining copper-clad phase, mixing with copper powder, pressing, and sintering. USE - Preparation of graphene-copper composite material. ADVANTAGE - The method is economical, and produces graphene-copper composite material with excellent mechanical properties and thermal conductivity. DETAILED DESCRIPTION - Preparation of graphene-copper composite material involves (1) mixing graphene dispersion with hydrofluoric acid solution, ultrasonically processing for 3-5 minutes, placing the mixture in a reactor with PTFE lining, sealing the reactor, heating to 170 plus minus 10 degrees C for more than 25 hours, air-cooling to room temperature, opening the reactor, filtering the mixture in the reactor through a microporous membrane, washing the solid phase with double distilled water, freeze-drying, obtaining hydrofluoric acid-treated graphene, (2) soaking the hydrofluoric acid-treated graphene in the aqueous solution of sodium hydroxide and sodium citrate, placing in a water bath at 70-80 degrees C, stirring, warming, heat-preserving, air-cooling to room temperature, filtering through a microporous membrane, washing the solid phase with double distilled water, freeze-drying, obtaining processed graphene, (3) dispersing the processed graphene in deionized water to form a solution, adjusting the pH of the solution to 9-10, stirring the solution, adding titanate coupling agent, hydrazine hydrate and propylene glycol to the solution, stirring for 2-5 hours, placing in a water bath at 60 plus minus 5 degrees C, adding cerium trifluoromethanesulfonate, stirring for more than 20 minutes, filtering immediately, washing the solid phase with double distilled water, freeze-drying, obtaining solid phase, (4) preparing an aqueous solution of copper sulfate and 2,2-bipyridine, and an aqueous solution of disodium edetate and potassium sodium tartrate, mixing to form a mixed solution, adding the aqueous formaldehyde solution, adding aqueous methanol solution and the aqueous sodium nitrate solution, obtaining plating solution, placing in water bath at 60 plus minus 5 degrees C, adjusting the pH of the solution to 8-9 with sodium hydroxide solution, pouring the solid phase into the plating solution, stirring, ultrasonically processing, controlling the pH value of the plating solution in real time at 8-9, stirring until there are no more bubbles in the bath, air-cooling to room temperature, filtering, washing the solid phase with deionized water, drying, obtaining copper-clad phase, (5) mixing the copper-clad phase and copper powder to form a mixed powder, pressing the mixed powder into a compact, and sintering.