▎ 摘　　要

NOVELTY - An air flow generating device (100) for preparing graphene powder comprises outer bushing (110) having chamber (112), intake opening (114), and outtake opening (116), in which intake opening is connected to chamber from below and outtake opening is connected to chamber from above, and chamber has necked portion (112a); and rotating awl (120) disposed in chamber, in which rotating awl and chamber are conformal, rotating awl and inner wall of chamber have slit spacing (108) in between, and rotating awl comprises rotating body (122) and screw threads (124). USE - An air flow generating device for preparing graphene powder used for preparing graphene dispersion (claimed). ADVANTAGE - The device prepares graphene powder with low oxygen content. The method produces graphene dispersion that can meet both of environmental protection and commercialization needs with high solid content, high production yield, variation option of solvent, controllable rheology of suspension, long stable duration of suspension, reliable quality of products, and low manufacturing cost. DETAILED DESCRIPTION - An air flow generating device (100) for preparing graphene powder comprises outer bushing (110) having chamber (112), intake opening (114), and outtake opening (116), in which intake opening is connected to chamber from below and outtake opening is connected to chamber from above, and chamber has necked portion (112a); and rotating awl (120) disposed in chamber, in which rotating awl and chamber are conformal, rotating awl and inner wall of chamber have slit spacing (108) in between, rotating awl comprises rotating body (122) and screw threads (124), and screw threads are distributed on outer surface of rotating body from bottom of rotating body toward top of rotating body in spiral manner. When rotating awl rotates in chamber, upward cyclone having horizontal component is produced via screw threads and slit spacing. INDEPENDENT CLAIMS are included for: (1) preparing graphene dispersion which involves performing homogenization process on graphene powder and processing solvent to form graphene paste; and performing layer-thinning process on graphene paste to form graphene dispersion, in which graphene powder is formed by air flow generating device; and (2) graphene dispersion formed by graphene powder and processing solvent using the preparation method of graphene dispersion, in which graphene in graphene dispersion has average diameter of 0.5-1 mu m, 3-5 layers, solid content of 5-50%, and residue oxygen content of less than or equal to 1 wt.%, and after being left to stand for 12 hours, the graphene dispersion has concentration distribution increasing from top section to bottom section in storage container, viscosity of 5000-8000 cps, and graphene concentration of 20 wt.%. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional diagram of the air flow generating device. Air flow generating device (100) Slit spacing (108) Outer bushing (110) Chamber (112) Necked portion (112a) Intake opening (114) Outtake opening (116) Rotating awl (120) Rotating body (122) Screw threads (124)