▎ 摘　　要

NOVELTY - Graphene composite conductive ink comprises e.g. 1-30 pts. wt. graphene, 0.1-15 pts. wt. multi-walled carbon nano-tubes, 0-7.5 pts. wt. conductive carbon black, 290-320 pts. wt. mixed solvent, 0.2-10 pts. wt. surfactant and 0.2-15 pts. wt. binder, where the molar ratio between ethanol and water in mixed solvent is 1-10:1-10, the surfactant is polyvinyl pyrrolidone, hexadecyl trimethyl ammonium bromide, sodium dodecyl benzene sulfonate and/or trisodium citrate, and the adhesive is polyvinyl alcohol, aqueous acrylic resin, hydroxypropyl methyl cellulose and/or ethyl cellulose. USE - The graphene composite conductive ink is useful for ink-jet printing (claimed). ADVANTAGE - The method: is simple, and easy; eliminating the covalent modification of tedious, dipolar addition reaction, diazo coupling, solvent exchange and a series of difficult operation; does not utilizes toxic reagent. DETAILED DESCRIPTION - Graphene composite conductive ink comprises 1-30 pts. wt. graphene, 0.1-15 pts. wt. multi-walled carbon nano-tubes, 0-7.5 pts. wt. conductive carbon black, 290-320 pts. wt. mixed solvent, 0.2-10 pts. wt. surfactant and 0.2-15 pts. wt. binder, where the number of layers of the graphene is 1-10 layers, the sheet diameter of the graphene is 0.1-5 mu m, the initial conductivity of the graphene is 10000-20000 second/m, the length of the multi-walled carbon nano tube is 10-30 mu m, the inner diameter of the multi-walled carbon nano tube is 10-20 nm, and the initial conductivity of multi-walled carbon nano tube is 300-600 second/m, the molar ratio between ethanol and water in mixed solvent is 1-10:1-10, the surfactant is polyvinyl pyrrolidone, hexadecyl trimethyl ammonium bromide, sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and/or trisodium citrate, and the adhesive is polyvinyl alcohol, aqueous acrylic resin, hydroxypropyl methyl cellulose and/or ethyl cellulose. An INDEPENDENT CLAIM is also included for preparing graphene composite conductive ink, comprising (i) simultaneously adding graphene, multi-walled carbon nano-tubes, conductive carbon black and surfactant into mixed solvent, and carrying out ultrasonic pre-dispersion to obtain pre-dispersion liquid, (ii) adding obtained pre-dispersion liquid into sand mill or basket grinding machine, and carrying out grinding for 2-25 hours under mixing condition at a rotating speed of 1800-2500 revolutions/minute to obtain graphene composite conductive paste, (iii) removing large size particles and undispersed materials of the obtained graphene composite conductive paste for preventing clogging of the nozzle by carrying out centrifuging or filtering to obtain first sample of graphene ink, and (v) adding binder to the obtained first sample of the graphene ink, and adjusting viscosity and printability of the ink to obtain final product.