▎ 摘　　要

NOVELTY - A modified graphene is prepared by adding natural flaky graphite to a high-speed crusher, crushing, sieving, obtaining graphite powder, placing the graphite powder in a microwave oven, performing microwave treatment, obtaining expanded graphite powder, adding the expanded graphite powder to a concentrated sulfuric acid solution added with potassium permanganate, stirring at room temperature for 1-2 hours, obtaining expanded graphite oxide powder, adding the expanded graphite oxide powder to a sodium hydroxide solution at 145-150 degrees C for 1.5-2 hours in a water bath, adjusting pH to neutral, mixing obtained solution with sodium dodecylbenzene sulfonate, then adding obtained mixture to a stripper, ultrasonically stripping, obtaining a crude graphene solution, adding hydroxypropyl methyl cellulose and sodium stearate to the crude graphene solution, uniformly stirring, and spray-drying in a spray dryer. The stripper includes a casing, an electric motor and an ultrasonic generator. USE - Modified graphene is used for vinyl chloride polymerization. ADVANTAGE - The modified graphene is prepared using the ultrasonic stripper. The solution after ultrasonic stripping forms a vortex. The difference between the internal and external rotational speeds of the vortex is used to separate the graphite and graphene, such that the ultrasonic wave accelerates the stripping speed of graphene. DETAILED DESCRIPTION - A modified graphene is prepared by adding natural flaky graphite to a high-speed crusher, crushing at 360-420 rpm, sieving, obtaining graphite powder, placing the graphite powder in a microwave oven, performing microwave treatment for 15-25 seconds, obtaining expanded graphite powder, adding the expanded graphite powder to a concentrated sulfuric acid solution added with potassium permanganate, stirring at room temperature for 1-2 hours, obtaining expanded graphite oxide powder, adding the expanded graphite oxide powder to a sodium hydroxide solution at 145-150 degrees C for 1.5-2 hours in a water bath, adjusting pH to neutral, mixing obtained solution with sodium dodecylbenzene sulfonate, then adding obtained mixture to a stripper, ultrasonically stripping, obtaining a crude graphene solution, adding hydroxypropyl methyl cellulose and sodium stearate to the crude graphene solution in a ratio of 3:1, uniformly stirring, and spray-drying in a spray dryer. The stripper includes a casing, an electric motor and an ultrasonic generator. The housing has a cylindrical cavity structure. A feed pipe is fixedly connected to the upper portion of the casing. The electric motor is fixedly connected to the bottom of the casing. The output shaft of the electric motor extends through the casing. The output shaft of the electric motor is provided inside the casing, and one end is fixedly connected with a circulating rod. A spiral circulation groove is opened inside the circulation rod. The circulation groove is opened at the upper and lower ends of the circulation pipe. A vibrating valve is sleeved on one end of the circulating rod away from the motor. An auxiliary block is fixedly connected to the inner cavity of the casing facing a vibration valve. The opposite side of auxiliary block and vibration valve is inclined. A cavity (C1) is opened inside the auxiliary block. The cavity (C1) has an annular design, and is provided close to the opening on one side of the vibration valve. A vibration plate is fixedly connected to the opening of the cavity (C1). The vibrating plate is provided with uniformly distributed stripping chambers on the side close to the vibrating valve. The stripping chambers have arc-shaped structure. The ultrasonic generator is installed in the cavity (C1). The vibration valve is provided with a conduction groove. The conduction groove is used to conduct conduction between two adjacent stripping chambers in the vertical direction. A vortex disc is fixedly connected to the bottom of the casing. The vortex disc has a stepped conical design. The top of the vortex disc is provided with uniformly distributed liquid outlets. A turbine is sleeved on the circulating rod corresponding to the vortex disc. The casing is provided below the vortex disc with a static cavity. A liquid outlet pipe is fixedly connected to the bottom end of the stationary cavity.