▎ 摘　　要

NOVELTY - Method comprises (i) introducing graphene, conductive nanoparticles,polyester glycol, hexamethylene diisocyanate, butyl tin dilaurate,dimethylolpropionic acid, N-methylpyrrolidone, deionized water,microcrystalline wax, stabilizers, pigments, modified defoamer, and dispersant, (ii) introducing graphene into piperidine and magnetically, stirring, placing ultrasonic dispersion to obtain a mixed solution a, (iii) introducing conductive nanoparticles to piperidine and magnetically stirring, (iv) introducing polyester diol and hexamethylene diisocyanate into a three-necked flask, heating, introducing butyl tin dilaurate and reacting and introducing dimethylolpropionic acid and N-methylpyrrolidone, and reacting to obtain a mixed solution c; (v) dissolving 1,6-hexanediol in acetone and mixing, stirring and shear at high speed for 1-2 hours, introducing triethylamine solution to emulsify for 30-40 minutes, performing vacuum distillation, and ball milling. USE - The method is useful for preparing environmentally friendly nano ink. ADVANTAGE - The method does not contain toxic derivatives e.g. benzene, it has less environmental pollution with environmental protection and other advantages, graphene, conductive nanoparticles as conductive fillers instead of silver particles greatly reduce costs and have certain economic benefits. The addition of modified defoamer effectively overcomes the foaming defect of water-based polyurethane resin, making the preparation process of nano ink more convenient and efficient. DETAILED DESCRIPTION - Environmentally friendly preparation method of nano ink comprises (i) introducing 10-15 pts. wt. graphene, 8-10 pts. wt. conductive nanoparticles, 15-20 pts. wt. polyester glycol, 15-20 pts. wt. hexamethylene diisocyanate, 0.5-0.9 pts. wt. butyl tin dilaurate, 4-6 pts. wt. dimethylolpropionic acid, 3-5 pts. wt. N-methylpyrrolidone, 20-25 pts. wt. deionized water, 5-8 pts. wt. microcrystalline wax, 2-4 pts. wt. stabilizers, 5-6 pts. wt. pigments, 3-5 pts. wt. modified defoamer, 2-4 pts. wt. dispersant, (ii) introducing graphene into piperidine and magnetically, stirring at a rate of 200-220 revolutions/minutes for 2-3 hours, placing ultrasonic dispersion at a frequency of 30-50 kHz for 20 minutes to obtain a mixed solution a, (iii) introducing conductive nanoparticles to piperidine and magnetically stirring at 220-250 revolutions/minutes for 3-4 hours, introducing the mixed solution, magnetic stirring at 250-260 revolutions/minutes for 8-10 hours to obtain mixed liquid b, (iv) introducing polyester diol and hexamethylene diisocyanate into a three-necked flask, heating the water bath to 85degreesC and stirring for 2-3 hours, introducing butyl tin dilaurate and reacting for 30-40 minutes, cooling to 60degreesC and introducing dimethylolpropionic acid and N-methylpyrrolidone, and controlling the temperature of the water bath at 60-70degreesC to react for 10 minutes, heating to 85degreesC and reacting for 2-2.5 hours to obtain a mixed solution c; (v) dissolving 1,6-hexanediol in acetone and mixing it with the mixture b prepared in step (iii) uniformly, introducing dropwise the mixture c prepared in step (iv), stirring and shear at high speed for 1-2 hours, introducing triethylamine solution to emulsify for 30-40 minutes, performing vacuum distillation, and distilling the acetone to obtain a mixed solution d, (vi) mixed solution d prepared in step (v), deionized water, microcrystalline wax, stabilizers, pigments, modified defoamers, and dispersants are stirred and mixing at a rate of 300-350 revolutions/minutes for 2-3 hours, ball milling for 5-6 hours, and the speed of the ball mill is 400-500 revolutions/minutes to obtain nano Ink.