▎ 摘　　要

NOVELTY - Preparing positive temperature coefficient graphene-based conductive ink comprises e.g. adding heteropoly acid to graphene oxide acetone dispersion, centrifuging to collect first precipitate, drying, re-suspending first precipitate in acetone, adding platinum acetylacetonate, centrifuging to collect second precipitate, drying, reducing second precipitate to obtain platinum quantum dot-doped graphene, re-suspending in ethanol to obtain platinum quantum dot-doped graphene dispersion, adding platinum quantum dot-doped graphene dispersion, platinum quantum dot-doped graphene dispersion, and conductive carbon black to first dispersant to obtain platinum quantum dot-doped graphene-carbon black slurry, mixing granular polyethylene terephthalate and powdered polylactic acid resin, melting to mix, granulating, grinding, and adding granular polyethylene terephthalate modified polylactic acid mixture to second dispersant to obtain polyethylene terephthalate modified polylactic acid mixture. USE - The method is useful for preparing positive temperature coefficient graphene-based conductive ink. ADVANTAGE - The ink has improved anti-peeling property, good glass transition temperature range and adhesion property. DETAILED DESCRIPTION - Preparing positive temperature coefficient graphene-based conductive ink comprises (i) stirring and mixing to add heteropoly acid to graphene oxide acetone dispersion, centrifuging to collect first precipitate, drying, re-suspending first precipitate in acetone, stirring and mixing to add platinum acetylacetonate, centrifuging to collect second precipitate, drying, reducing second precipitate in hydrogen environment to obtain platinum quantum dot-doped graphene, and re-suspending in ethanol to obtain platinum quantum dot-doped graphene dispersion, (ii) stirring to slowly add 15-40 pts. wt. platinum quantum dot-doped graphene dispersion, 15-40 pts. wt. platinum quantum dot-doped graphene dispersion, and 5-25 pts. wt. conductive carbon black to 50-250 pts. wt. first dispersant to obtain platinum quantum dot-doped graphene-carbon black slurry, (iii) uniformly mixing 1-5 pts. wt. granular polyethylene terephthalate and 15-35 pts. wt. powdered polylactic acid resin, melting to mix, granulating, grinding to micron or nano-sized particles polyethylene terephthalate modified polylactic acid mixture, and stirring to add granular polyethylene terephthalate modified polylactic acid mixture to 50-250 pts. wt. second dispersant to obtain polyethylene terephthalate modified polylactic acid mixture, (iv) slowly adding polyethylene terephthalate modified polylactic acid mixture and 500-2500 pts. wt. third dispersant to platinum quantum dot-doped graphene-carbon black slurry, continuously stirring and reacting mixture in reaction kettle at 75-85 degrees C for 0.5-2 hours, and naturally cooling to obtain polylactic acid-platinum quantum dot doped graphene-based mixed liquid, and (v) stirring to add 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 polylactic acid-platinum quantum dot doped graphene-based mixed solution at a speed of 500-5000 revolutions/minute for 0.5-6 hours to obtain positive temperature coefficient graphene-based conductive ink, where the heteropoly acid includes phosphomolybdic acid, silicomolybdic acid, phosphotungstic acid, and/or silicotungstic acid. An INDEPENDENT CLAIM is also included for the positive temperature coefficient graphene-based conductive ink.