▎ 摘　　要

NOVELTY - Preparing graphene/styrene-butyl acrylate dielectric composite material based on miniemulsion polymerization comprises e.g. pouring graphite powder, concentrated sulfuric acid and phosphoric acid slowly into the reaction vessel, mechanical stirring, adding potassium permanganate, reacting, cooling, adding hydrogen peroxide, stirring, cooling, allowing to stand, washing, freeze-drying and grinding to obtain graphene oxide powder, dispersing the graphene oxide powder into deionized water to obtain graphene oxide dispersion, placing the purified styrene and butyl acrylate in reactor, adding aqueous solution containing a pH buffer and an emulsifier and heating to obtain styrene-butyl acrylate pre-emulsion, adding aqueous initiator solution dropwise into the styrene-butyl acrylate pre-emulsion, and reacting to obtain styrene-butyl acrylate emulsion, adding polystyrene-butyl acrylate emulsion into graphene oxide dispersion, and adding hydrazine hydrate and heating. USE - The graphene/styrene-butyl acrylate dielectric composite material is useful as dielectric material (claimed). ADVANTAGE - The material has frequency of 1000 Hz, dielectric constant is increased by 8 times, and high dielectric constant. DETAILED DESCRIPTION - Preparing graphene/styrene-butyl acrylate dielectric composite material based on miniemulsion polymerization comprises (i) pouring graphite powder, concentrated sulfuric acid and phosphoric acid slowly into the reaction vessel, mechanical stirring the reaction under ice water bath conditions for 1-4 hours, adding potassium permanganate and reacting for 2-5 hours, then gradually increasing the temperature of the reaction solution to 30-50 degrees C, stirring the reaction for 10-15 hours, cooling to room temperature, pouring the reaction solution into deionized water after ice bath, stirring and mixing, then adding hydrogen peroxide, stirring the reaction for 1-4 hours, cooling to room temperature, allowing to stand for 24-36 hours, discard the supernatant, washing and centrifuging until the pH of the solution reaches neutral, freeze-drying centrifugal precipitate and grinding to obtain graphene oxide powder, dispersing the graphene oxide powder into deionized water to obtain graphene oxide dispersion by ultrasonic dispersion, (ii) purifying styrene and butyl acrylate using sodium hydroxide solution, placing the purified styrene and butyl acrylate in the reactor under mechanical stirring, adding aqueous solution containing a pH buffer and an emulsifier and slowly heating at 70-80 degrees C to obtain styrene-butyl acrylate pre-emulsion, adding aqueous initiator solution dropwise into the styrene-butyl acrylate pre-emulsion, and reacting for 4-5 hours under nitrogen gas atmosphere to obtain styrene-butyl acrylate emulsion, and (iii) adding polystyrene-butyl acrylate emulsion prepared in step (ii) into the obtained graphene oxide dispersion prepared in the step (i), adding hydrazine hydrate and heating at 90-95 degrees C in a water bath under nitrogen gas atmosphere and mechanical stirring, reacting for 4-5 hours, then demulsifying the emulsion and drying to obtain graphene/styrene-butyl acrylate particles, and hot pressing to obtain final product. An INDEPENDENT CLAIM is also included for graphene/styrene-butyl acrylate dielectric composite material prepared by above method.