▎ 摘　　要

NOVELTY - Preparation of composite graphene back gel involves adding concentrated sulfuric acid, graphite powder and sodium nitrate to reaction kettle, stirring, adding potassium permanganate, reacting, adding deionized water to reaction kettle, stirring, adding hydrogen peroxide and hydrochloric acid solution, shaking, stirring and reacting, performing low-speed centrifugal washing, adjusting pH of the mixed solution to be neutral to obtain neutral graphite oxide solution, diluting neutral graphite oxide solution, ultrasonically processing, removing the upper suspension, drying to obtain sheet-like graphene oxide, mixing microporous starch and water in mixer, heating to 95 degrees C, stirring until the microporous starch is gelatinized, adding dispersant, stirring for 30 minutes, adding graphene oxide, stirring for 40 minutes to obtain mixed gel of graphene and starch, taking out mixed gel of graphene and starch from discharge port through scraper, and extruding through twin-screw extruder. USE - Preparation of composite graphene back gel for rubber filler. ADVANTAGE - The preparation method is simple and economical, and produces composite graphene gel and resulting solution, which causes less pollution to the environment. DETAILED DESCRIPTION - Preparation of composite graphene back gel involves adding concentrated sulfuric acid, graphite powder and sodium nitrate to reaction kettle, stirring at less than 6 degrees C, adding potassium permanganate, stirring and reacting at less than 10 degrees C, adding deionized water, stirring at 95 degrees C, adding hydrogen peroxide and hydrochloric acid solution, shaking, stirring and reacting, centrifugally washing at low speed, adjusting pH to neutral to obtain neutral graphite oxide solution, diluting, ultrasonically processing, removing the upper suspension, drying to obtain sheet-like graphene oxide, mixing microporous starch and water, heating to 95 degrees C, stirring until the microporous starch is gelatinized, adding dispersant, stirring for 30 minutes, adding graphene oxide, stirring for 40 minutes so that graphene oxide is evenly distributed in the pores of the microporous starch to obtain mixed gel of graphene and starch, taking out the mixed gel from discharge port through scraper, and extruding through twin-screw extruder to obtain graphene gel particles. An INDEPENDENT CLAIM is included for device for the preparation of composite graphene back gel, which comprises mixing and stirring device comprising mixing stirrer, motor, fixedly installed on the top of stirrer, and Sohu motor output shaft fixedly connected with telescopic rod. The bottom of the telescopic rod is fixedly connected to stirring shaft, the surface of the stirring shaft is fixedly connected with a stirring rod, and the top left side of the mixing stirrer is fixedly connected to feed pipe, and the inner lower end of the mixing mixer is fixedly connected to heat conducting plate, the inner bottom surface of the mixing stirrer is fixedly connected to support rod, the top of the support rod is fixedly connected with heat insulation pad, and the top of the heat insulation pad is installed with heating device. The heat conducting plate is located on the top of the heating device, the lower ends of the left and right sides of the mixing stirrer are provided with heat dissipation holes, the heat dissipation holes are located at the lower end of the heat conducting plate, and the top surface of the heat conducting plate is connected with scraper. The left side of the scraper is fixedly connected with a connecting rod, the left side of the mixing stirrer is provided with a round hole at the position of the connecting rod, the connecting rod is slidably connected to the round hole, and the left side of the connecting rod is fixedly connected with a handle , a discharge port is provided on the right side of the mixing stirrer at the position of the heat conducting plate, the top of the discharge port is provided with a rectangular groove, and a sealing plate is slidably connected to the inside of the rectangular groove, a connecting block is fixedly connected to the top of the sealing plate, and a baffle plate is fixedly connected to the outside of the discharge port on the surface of the mixing stirrer.