▎ 摘　　要

NOVELTY - The preparation method of a coated cotton fabric involves: dispersing graphene oxide dispersion liquid into ethanol, and performing ultrasonic treatment to obtain homogeneous phase dispersion liquid; dispersing ferrous chloride tetrahydrate and ferric chloride hexahydrate into ethanol to obtain a mixed solution; mixing the homogeneous dispersion liquid with the mixed solution, adding aqueous ammonia, heating and stirring to obtain reduced graphene oxide-iron oxide black precipitate; dispersing the black precipitate into ethanol, carrying out ultrasonic treatment, and then transferring to a reaction kettle for vigorous stirring; adding 2-hydroxyethyl methacrylate, butyl acrylate and 2,2'-azo (isobutyronitrile) into the mixed solution, and carrying out heating copolymerization reaction to obtain a viscous polymer solution; placing the desized, washed and bleached all-cotton fabric into a mold, pouring the viscous polymer solution into the mold, and performing infiltration treatment. USE - Preparation method of a coated cotton fabric with efficient electromagnetic wave absorption performance. ADVANTAGE - The method uses polyacrylate as the polymer matrix of the coating material, and the polymer has good water resistance and elasticity. The wave-absorbing cotton fabric is prepared by the coating method, the method is simple to operate, and the prepared cotton fabric has excellent electromagnetic wave-absorbing performance. DETAILED DESCRIPTION - The preparation method of a coated cotton fabric with efficient electromagnetic wave absorption performance involves: weighing 16-22 mL graphene oxide dispersion liquid, dispersing the graphene oxide dispersion liquid into ethanol, and performing ultrasonic treatment for 20-40 minutes to obtain homogeneous phase dispersion liquid; dispersing ferrous chloride tetrahydrate and ferric chloride hexahydrate into ethanol to obtain a mixed solution; mixing the homogeneous dispersion liquid with the mixed solution, adding 37-43 mL aqueous ammonia, heating and stirring at 55-65 ℃ for 5-7 hours to obtain reduced graphene oxide-iron oxide black precipitate; dispersing the black precipitate into ethanol, carrying out ultrasonic treatment for 1.5-3 hours, and then transferring to a reaction kettle for vigorous stirring; adding 0.8-1.2 mL 2-hydroxyethyl methacrylate, 1.1-1.5 mL butyl acrylate and 4.2-5.4 mg 2,2'-azo (isobutyronitrile) into the mixed solution, and carrying out heating copolymerization reaction at 55-65 ℃ for 10-14 hours to obtain a viscous polymer solution; placing the desized, washed and bleached all-cotton fabric into a mold, pouring the viscous polymer solution into the mold, and performing infiltration treatment; and taking out the all-cotton fabric subjected to the soaking treatment for 9-13 hours, and drying at 60-80 ℃ for 15-18 hours.