▎ 摘　　要

NOVELTY - Method for preparing polyvinylidene fluoride vinyl composite dielectric sheet based on graphene-disordered carbon sandwich structure involves (a) weighing multilayer graphene nanosheets, dispersing in deionized water, (b) adding surfactant Triton X100, (c) pouring the mixed solution into a stainless steel reactor with polytetrafluoroethylene, (d) centrifuging and cleaning the reaction product, washing with deionized water and ethanol for 3 times, (e) in a nitrogen atmosphere, using a tube furnace at the programmed heating time to 5 degrees C/minute, (f) treating the graphene-disordered carbon obtained above with a mixed acid of nitric acid and sulfuric acid, (g) weighing a quantitative graphene-disordered carbon powder, mixing with 20 ml of absolute ethanol, and (h) thoroughly grinding the dried product in an agate mortar for about 15 minutes to obtain a fine powder, and heating the insulating sheet to obtain a graphene-disordered carbon/polyvinylidene fluoride composite dielectric sheet. USE - The method is used for preparing polyvinylidene fluoride vinyl composite dielectric sheet based on graphene-disordered carbon sandwich structure. ADVANTAGE - The method has a wide range of raw materials, is environmentally-friendly, is simple, has excellent dielectric energy storage performance, and excellent application value and prospects. DETAILED DESCRIPTION - Method for preparing polyvinylidene fluoride vinyl composite dielectric sheet based on graphene-disordered carbon sandwich structure involves (a) weighing a certain amount of multilayer graphene nanosheets, dispersing in deionized water, (b) adding a small amount of surfactant Triton X100, and ultrasonically dispersing for 3 hours to obtain a uniform graphene dispersion, adding a certain amount of glucose powder to the dispersion, and ultrasonically dispersing continuously for 0.5 hours, so that further mixing the multilayer graphene nanosheets and glucose uniformly, (c) pouring the mixed solution obtained in step (b) into a stainless steel reactor with polytetrafluoroethylene as the substrate, and after confirming that it is completely sealed, fully reacting in a homogeneous reactor at a high temperature of 180 degrees C at 5 rpm, after the reaction, cooling to room temperature naturally, (d) centrifuging and cleaning the reaction product at a speed of 8000 rpm, each centrifugation time is 10 minutes, washing with deionized water and ethanol for 3 times, and drying the centrifuged product in a drying box at 60 degrees C for 12 hours, (e) in a nitrogen atmosphere, using a tube furnace to thermally cure the dried product at the programmed heating time to 5 degrees C/minute, and maintaining the temperature at 300 degrees C for 2 hours, and obtaining finally the graphene-disordered carbon sandwich structure, (f) treating the graphene-disordered carbon obtained above with a mixed acid of nitric acid: sulfuric acid of 3:1 at 70 degrees C for 2 hours to obtain a graphene-carboxylated disordered carbon sandwich structure, (g) weighing a quantitative graphene-disordered carbon powder, mixing with 20 ml of absolute ethanol, and weighing 500 mg polyvinylidene fluoride powder into the above-mentioned mixed solution, and ultrasonically reacting for 2 hours for uniform mixing, pouring the resulting solution into a watch glass and drying at 60 degrees C for 4 hours, (h) thoroughly grinding the dried product in an agate mortar for about 15 minutes to obtain a fine powder, taking an appropriate amount and pouring into a tablet press mold, maintaining it in a powder tablet press at a pressure of 20 MPa for 10 minutes, and pressing it into a sheet with a thickness of 1-1.5 mm, heating the insulating sheet at 200 degrees C for 3 hours in an air atmosphere to obtain a graphene-disordered carbon/polyvinylidene fluoride composite dielectric sheet, where the graphene-disordered carbon/polyvinylidene fluoride composite dielectric material prepared by the above process has an ultra-high dielectric constant value, and after surface modification, reducing the filling amount of filler, and has wide sources of raw materials, simple preparation process, and good development value.