▎ 摘　　要

NOVELTY - Preparing sintered graphene/nano silver conductive adhesive comprises (a) dissolving graphite oxide in deionized water, sonicating to obtain a graphene oxide suspension, adding silver nitrate and sodium citrate to deionized water, stirring evenly to obtain a first mixed solution, adding the first mixed solution to the graphene oxide suspension, stirring uniformly to obtain a second mixed solution, mixing glucose and the dispersant to dissolve in deionized water to obtain a glucose solution, slowly adding the glucose solution to the second mixed solution to obtain a pre-reduced third mixed solution, (b) slowly adding the ascorbic acid aqueous solution, reacting to obtain a fourth mixed solution, centrifuging, collecting the precipitate and freeze-drying to obtain a graphene/nano silver material and (c) mixing and stirring the graphene/nano-silver material, micron silver, epoxy resin, acid anhydride curing agent and curing accelerator evenly and curing. USE - The method is useful for preparing sintered graphene/nano silver conductive adhesive. ADVANTAGE - The adhesive: has low volume resistivity, high thermal conductivity and a simple preparation process and is suitable for mass production. DETAILED DESCRIPTION - Preparing sintered graphene/nano silver conductive adhesive comprises (a) dissolving graphite oxide in deionized water, sonicating it for 1-2 hours to obtain a graphene oxide suspension, adding silver nitrate and sodium citrate to deionized water, stirring evenly to obtain a first mixed solution, adding the first mixed solution to the graphene oxide suspension, stirring uniformly to obtain a second mixed solution, mixing glucose and the dispersant to dissolve in deionized water to obtain a glucose solution, slowly adding the glucose solution to the second mixed solution, stirring at 65-70 degrees C for 30-40 minutes under an inert gas environment to obtain a pre-reduced third mixed solution, where the dispersant is at least one of sodium citrate, sodium lauryl sulfate and polyvinylpyrrolidone, (b) adding the ascorbic acid aqueous solution slowly to the third mixed solution, reacting at 65-70 degrees C for 40-50 minutes to obtain a fourth mixed solution, centrifuging the fourth mixed solution at 4000 revolutions/minute, washing 10 times with deionized water, collecting the precipitate and freeze-drying for 20 hours to obtain a graphene/nano silver material and (c) mixing and stirring the graphene/nano-silver material, micron silver, epoxy resin, acid anhydride curing agent and curing accelerator evenly, and curing at 140-160 degrees C for 2 hours to obtain conductive adhesive, where the acid anhydride curing agent is 4-methylhexahydrophthalic anhydride, the curing accelerator is 2-ethyl-4-methylimidazole and the mass fraction ratio of the epoxy resin: acid anhydride curing agent: curing accelerator: micron silver: graphene/nano silver material is 100:80-85:1-2:500-550:1.2-2.