▎ 摘　　要

NOVELTY - Preparation of graphene-based conductive ink involves: (1) preparing titanium quantum dot-doped graphene dispersion by adding heteropoly acid to a graphene oxide acetone dispersion, stirring and mixing, collecting a precipitate (A) by centrifugation, drying, resuspending the precipitate (A) with acetone, and adding titanium acetylacetonate, again stirring and mixing, centrifuging to collect a precipitate (B) and drying, placing the precipitate (B) in a hydrogen environment for reduction to prepare titanium quantum dot-doped graphene, and resuspending with ethanol; (2) preparing a titanium quantum dot doped graphene-carbon black paste by taking dispersant (A), stirring and adding titanium quantum dot-doped graphene dispersion and conductive carbon black to the dispersant (A); (3) preparing a mixture; and (4) preparing polylactic acid-titanium quantum dot doped graphene-based mixed solution. USE - The method is useful for preparing graphene-based conductive ink (claimed). DETAILED DESCRIPTION - Preparation of graphene-based conductive ink involves: (1) preparing a titanium quantum dot-doped graphene dispersion by adding heteropoly acid to a graphene oxide-acetone dispersion, stirring and mixing, collecting a precipitate (A) by centrifugation, drying, resuspending the precipitate (A) with acetone, and adding titanium acetylacetonate, again stirring and mixing, centrifuging to collect a precipitate (B) and drying, placing the precipitate (B) in a hydrogen environment for reduction to prepare titanium quantum dot-doped graphene, and resuspending with ethanol; (2) preparing a titanium quantum dot-doped graphene-carbon black paste by taking 50-250 pts. wt. dispersant (A), stirring, and slowly adding 15-40 pts. wt. titanium quantum dot-doped graphene dispersion and 5-25 pts. wt. conductive carbon black to the dispersant (A); (3) preparing a mixture by taking 1-8 pts. wt. powdered methoxy polyethylene glycol acrylate and 15-35 pts. wt. powdered polylactic acid-polyethylene glycol block copolymer, uniformly mixing, then melt blending, granulating and grinding into micron-sized granular modified mixture, adding the modified mixture to 50-250 pts. wt. dispersant (B), and stirring; (4) preparing polylactic acid-titanium quantum dot-doped graphene-based mixed solution by separately adding PET modified polylactic acid mixture and 500-2500 dispersant (C), slowly dripping into the titanium quantum dot-doped graphene-carbon black paste, after the dripping is completed, transferring the mixed solution to a reactor, reacting at 75-85 degrees C for 0.5-2 hours, naturally cooling, and continuously stirring during the reaction; and (5) preparing the graphene-based conductive ink by adding 0.5-2.5 pts. wt. structure stabilizer, 0.5-2.5 pts. wt. polyacrylonitrile-maleic anhydride copolymer and 2-8 pts. wt. leveling agent to the polylactic acid-titanium quantum dot-doped graphene-based mixed solution, and stirring at 500-5000 rpm for 0.5-6 hours. The heteropoly acid includes phosphomolybdic acid, silicomolybdic acid, phosphotungstic acid and/or silicotungstic acid.