▎ 摘　　要

NOVELTY - Preparation of electroconductive silver paste-containing multi-level-structure nanofiller involves (1) treating spherical copper particles and flaky copper particles by adopting a sulfuric acid solution and a sodium hydroxide solution in sequence to obtain pretreated spherical copper particles and pretreated flaky copper particles, (2) mixing ammonium carbonate, ascorbic acid, polyethylene glycol 4000, 5-sulfosalicylic acid dihydrate and deionized water, ultrasonically treating at room temperature to obtain a solution (A), adding a silver nitrate solution into the solution (A), (3) mixing and dissolving zinc acetate dihydrate and ethanol, heating, (4) dispersing the prepared zinc oxide in deionized water, adding a polyethyleneimine solution, and (5) dissolving epoxy resin and toughened resin in a diluent to prepare premixed resin. USE - Preparation of electroconductive silver paste-containing multi-level-structure nanofiller (claimed) used in manufacture of mobile phone and solar battery thin grid. ADVANTAGE - The conductive silver paste has good conductive performance, excellent combination property with the substrate, good wear resistance and low cost preparation. DETAILED DESCRIPTION - Preparation of electroconductive silver paste-containing multi-level-structure nanofiller involves (1) treating spherical copper particles and flaky copper particles by adopting a sulfuric acid solution and a sodium hydroxide solution in sequence to obtain pretreated spherical copper particles and pretreated flaky copper particles, (2) mixing ammonium carbonate, ascorbic acid, polyethylene glycol 4000, 5-sulfosalicylic acid dihydrate and deionized water, ultrasonically treating at room temperature to obtain a solution (A), adding a silver nitrate solution into the solution (A), and then adding ammonium hydroxide to adjust the pH value to 9 to obtain a mixed solution, respectively mixing the mixed solution with the pretreated spherical copper particles and the pretreated flaky copper particles, stirring and reacting under the condition of water bath at 50-60℃, filtering after the reaction is completed, washing and drying the precipitate to obtain silver-coated spherical copper particles and silver-coated flaky copper particles, (3) mixing and dissolving zinc acetate dihydrate and ethanol, heating, slowly dripping an ethanol solution of sodium hydroxide, continuously stirring after dripping, cooling to room temperature, filtering, washing the prepared precipitate, and drying to obtain zinc oxide, (4) dispersing the prepared zinc oxide in deionized water, adding a polyethyleneimine solution, and stirring to prepare a modified zinc oxide dispersion, dispersing graphene nanosheets in deionized water, then adding the prepared modified zinc oxide dispersion liquid, ultrasonically treating, then filtering, washing and precipitating by sequentially adopting deionized water and absolute ethyl alcohol, and drying to obtain a zinc oxide/graphene hybrid material, (5) dissolving epoxy resin and toughened resin in a diluent to prepare premixed resin, adding a coupling agent, a curing agent, nanosilver powder, silver-coated spherical copper particles, silver-coated flaky copper particles and a zinc oxide/graphene hybrid material into the premixed resin, and uniformly stirring and mixing to obtain slurry, and grinding the slurry by adopting a three-roller machine.