▎ 摘　　要

NOVELTY - Graphene slurry is prepared by using raw materials comprising 1.5 g graphene, 20-100 mL divalent acid ester, and 50-250 mL ethanol. The graphene is prepared by (1) using electrolyte containing sulfuric acid and sulfate, (2) using graphite as positive electrode placed in the electrolyte, applying a working voltage to peel the graphite, obtaining a suspension, (3) removing the liquid portion in the suspension, washing and ultrasonically processing to obtained solid portion, cooling to -100 degrees C to -60 degrees C for 2-8 hours, and treating at -56 degrees C to -44 degrees C for 35-55 hours. USE - Graphene slurry used in preparation of conductive ink (claimed) for printed circuit. ADVANTAGE - The graphene slurry provides conductive ink with high stability, printability and conductivity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of graphene slurry, which involves mixing graphene, divalent acid ester and ethanol, homogenizing, and removing ethanol; (2) use of graphene slurry for preparing conductive ink; (3) conductive ink, which comprises the graphene slurry and an organic co-solvent which is added in an amount of 0.05-200 times based on the mass of the graphene slurry; and (4) preparation of conductive ink, which involves mixing raw materials.