▎ 摘　　要

NOVELTY - Preparing positive temperature coefficient (PTC) graphene-based conductive ink involves providing graphene oxide acetone dispersion, adding heteropoly acid to graphene oxide acetone dispersion, stirring and mixing, collecting first precipitate by centrifugation and drying, and using first precipitate resuspend in acetone and adding palladium acetylacetonate, collecting second precipitate by centrifugation and drying, placing 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. The 50-250 pts. wt. the first dispersant is taken and stirred, slowly added 15-40 pts. wt. palladium quantum dot-doped graphene dispersion and 5-25 pts. wt. to the first dispersant conductive carbon black to obtain palladium quantum dot doped graphene-carbon black paste. USE - Method for preparing positive temperature coefficient (PTC) graphene-based conductive ink. ADVANTAGE - The method enables to prepare positive temperature coefficient (PTC) graphene-based conductive ink, which has a suitable glass transition temperature range and adhesion ability, realizes the glass transition of PET modified polylactic acid in a suitable temperature range, and improves the peeling resistance of ink finishing. DETAILED DESCRIPTION - Preparing positive temperature coefficient (PTC) graphene-based conductive ink, involves providing graphene oxide acetone dispersion, adding heteropoly acid to graphene oxide acetone dispersion, stirring and mixing, collecting first precipitate by centrifugation and drying, and using first precipitate resuspend in acetone and adding palladium acetylacetonate, collecting second precipitate by centrifugation and drying, placing 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. The 50-250 pts. wt. the first dispersant is taken and stirred, slowly added 15-40 pts. wt. palladium quantum dot-doped graphene dispersion and 5-25 pts. wt. to the first dispersant conductive carbon black to obtain palladium quantum dot doped graphene-carbon black paste. The 1-5 pts. wt. granular polyethylene terephthalate (PET) and 15-35 pts. wt. powdered polylactic acid resin are provided, and the powdered polylactic acid resin and granular PET are uniformly mixed and then melt blended and granulated, ground into a micron or nano-sized granular PET modified polylactic acid mixture, the granular PET modified polylactic acid mixture is added to 50-250 pts. wt. second dispersant and stirred to prepare a PET modified polylactic acid mixture. The PET modified polylactic acid mixed liquid and 500-2500 pts. wt. the third dispersant are added slowly to the stirred palladium quantum dot-doped graphene-carbon black slurry, transferred the mixed solution to a reaction kettle at 75-85 degrees C for 0.5-2 hours and cooled naturally, continue to stir during the reaction to prepare a polylactic acid-palladium quantum dot doped graphene-based mixed solution. The 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 are added to the polylactic acid-palladium quantum dot doped graphene-based mixed solution, stirredat 500-5000 revolution/minute 0.5-6 hours and PTC graphene-based conductive ink is obtained. The heteropoly acid includes one or a combination of phosphomolybdic acid, silimolybdic acid, phosphotungstic acid and silicotungstic acid.