▎ 摘　　要

NOVELTY - Preparing PTC graphene-based conductive ink comprises preparing palladium quantum dot doped graphene dispersion by providing oxidized graphite alkene acetone dispersion, adding heteropoly acid to the oxidized graphite alkene acetone dispersion, stirring and mixing uniformly, centrifuging and collecting the first precipitate and drying, the first precipitate is resuspended by acetone and adding palladium acetylacetonate, again stirring and mixing uniformly, centrifuging and collecting the second precipitate and drying, adding the second precipitate in the hydrogen environment to reduce to obtain the palladium quantum dot doped graphene, re-suspending the ethanol to obtain the palladium quantum dot doped graphene dispersion, preparing palladium quantum dot doped graphenecarbon black slurry: taking 50-250 pts. wt. first dispersant and stirring. USE - The method is useful for preparing PTC graphene-based conductive ink. DETAILED DESCRIPTION - Preparing PTC graphene-based conductive ink comprises preparing palladium quantum dot doped graphene dispersion by providing oxidized graphite alkene acetone dispersion, adding heteropoly acid to the oxidized graphite alkene acetone dispersion, stirring and mixing uniformly, centrifuging and collecting the first precipitate and drying, the first precipitate is resuspended by acetone and adding palladium acetylacetonate, again stirring and mixing uniformly, centrifuging and collecting the second precipitate and drying, adding the second precipitate in the hydrogen environment to reduce to obtain the palladium quantum dot doped graphene, re-suspending the ethanol to obtain the palladium quantum dot doped graphene dispersion, preparing palladium quantum dot doped graphenecarbon black slurry: taking 50-250 pts. wt. first dispersant and stirring, slowly adding 15-40 pts. wt. palladium quantum dot doped graphene dispersion liquid and 5-25 pts. wt. conductive carbon black into the first dispersant to obtain the palladium quantum dot doped graphene-carbon black slurry, preparing PTC mixed solution by providing 1-8 pts. wt. powdery methoxy polyethylene glycol acrylate and 15-35 pts. wt. powdery polylactic acid-polyethylene glycol block copolymer, mixing the powdery polylactic acidpolyethylene glycol block copolymer and powdery methoxy polyethylene glycol acrylate uniformly, melting and mixing, granulating, grinding into micron-sized granular modified PTC mixture, adding the granular modified PTC mixture to 50-250 pts. wt. second dispersant and stirring to obtain the PTC mixed solution, preparing palladium quantum dot doped graphene-based mixed solution, slowly dropping the PTC mixed solution and 500-2500 pts. wt. third dispersant into the stirred palladium quantum dot doped graphene-carbon black slurry, transferring the mixed solution to 55-65 degrees C of the reaction kettle, reacting for 1-4 hours, naturally cooling, continuously stirring in the reaction process, preparing the palladium quantum dot doped graphene-based mixed solution, preparing of PTC graphenebased conductive ink: stirring palladium quantum dot doped with graphene-based mixed solution, at the same time, adding 0.5-2.5 pts. wt. structure stabilizer into the palladium quantum dot doped graphene-based mixed solution, 0.5-2.5 pts. wt. polyacrylonitrile-maleic anhydride copolymer and 2-8 pts. wt. leveling agent, stirring at 500-5000 rotations/minutes for 0.5-6 hours to obtain the PTC graphene-based conductive ink, the heteropoly acid comprises phosphomolybdic acid, silicomolybdic acid, phosphotungstic acid and silicotungstic acid.