▎ 摘　　要

NOVELTY - Preparing positive temperature coefficient (PTC) graphene-based conductive ink comprises providing graphene oxide acetone dispersion liquid, adding heteropoly acid to graphene oxide acetone dispersion liquid, stirring and uniformly mixing, centrifuging and collecting the first precipitate and drying, resuspending the first precipitate in acetone and adding with palladium acetylacetonate, again stirring and uniformly mixing, centrifuging to collect the second precipitate and drying, placing the second precipitate in a hydrogen environment for reduction to prepare palladium quantum dot-doped graphene, and resuspending in ethanol to prepare a palladium quantum dot-doped graphene dispersion, and taking 50-250 pts. wt. the first dispersant and stirring, and slowly adding 15-40 pts. wt. palladium quantum dot-doped graphene dispersion and 5-25 pts. wt. conductive carbon black to the first dispersant to obtain palladium quantum dot-doped graphene-carbon black slurry. USE - The method is useful for preparing PTC graphene-based conductive ink. ADVANTAGE - The method: has suitable glass transition temperature range and adhesion ability; on the one hand realizes the glass transition of polyimide modified polylactic acid in a suitable temperature range; and helps to improve the overall anti-peeling effect of the ink, especially when the PTC graphene-based conductive ink is printed on the polyimide film. DETAILED DESCRIPTION - Preparing positive temperature coefficient (PTC) graphene-based conductive ink comprises providing graphene oxide acetone dispersion liquid, adding heteropoly acid to graphene oxide acetone dispersion liquid, stirring and uniformly mixing, centrifuging and collecting the first precipitate and drying, resuspending the first precipitate in acetone and adding with palladium acetylacetonate, again stirring and uniformly mixing, centrifuging to collect the second precipitate and drying, placing the second precipitate in a hydrogen environment for reduction to prepare palladium quantum dot-doped graphene, and resuspending in ethanol to prepare a palladium quantum dot-doped graphene dispersion, taking 50-250 pts. wt. the first dispersant and stirring, slowly adding 15-40 pts. wt. palladium quantum dot-doped graphene dispersion and 5-25 pts. wt. conductive carbon black to the first dispersant to obtain palladium quantum dot-doped graphene-carbon black slurry, providing 1-5 pts. wt. granular polyimide and 15-35 pts. wt. powdered polylactic acid resin, uniformly mixing the powdered polylactic acid resin and granular polyimide and melting, mixing, granulating, grinding into a micron or nano-scale particulate polyimide modified polylactic acid mixture, and adding the particulate polyimide modified polylactic acid mixture to 50-250 pts. wt. the second dispersant and stirring to prepare a polyimide modified polylactic acid mixture, slowly adding the polyimide modified polylactic acid mixture and 500-2500 pts. wt. the third dispersant into the stirred palladium quantum dot doped graphene-carbon black slurry, transferring the mixed solution to a reaction kettle at 85-95 degrees C after the dripping is completed, reacting for 0.5-2 hours and naturally cooling, and continuously stirring during the reaction to obtain a polylactic acid-palladium quantum dot doped graphene-based mixed solution, and stirring the polylactic acid-palladium quantum dot doped graphene-based mixture, adding 0.5-2.5 pts. wt. structure stabilizer, 0.5-2.5 pts. wt. polyacrylonitrile-maleic anhydride copolymer and 2-8 pts. wt. flatting agent to the polylactic acid-palladium quantum dot doped graphene-based mixed solution, stirring at 500-5000 revolution per minutes for 0.5-6 hours. The heteropoly acid comprises phosphomolybdic acid, silimolybdic acid, phosphotungstic acid and/or silicotungstic acid. An INDEPENDENT CLAIM is also included for PTC graphene-based conductive ink prepared by the above preparation method.