▎ 摘　　要

NOVELTY - A preparation method of dopamine-mediated graphene, involves (S1) adding 10-50 gram of potassium permanganate in 1-5 L of concentrated sulfuric acid, adding 10-50 gram of graphite sheet and stirring for 1-5 hours, (S2) adding graphite wet powder into 1-5 L, 0.1-2M, sodium hydroxide and water solution, cutting the mixture for 1-10 hours at the rotating speed of 5000-30000 rpm, then washing by clean water, centrifuging and separating to obtain black graphene, (S3) dyeing by 1-10 mg/mL of dopamine hydrochloride aqueous solution, needed solution volume completely covers the hair sample, selecting alkaline solution, processing for 5-30 minutes at room temperature or higher temperature, then washing by clean water, drying to obtain the hair modified by poly-dopamine, and (S4) soaking the hair modified by poly-dopamine in different concentration of graphene slurry, fully mixing and standing for 5-30 minutes, drying to obtain the hair of the graphene USE - The prepared graphene used as hair dye (claimed). ADVANTAGE - The dopamine-mediated graphene dyeing agent is an environment-friendly hair dye. The addition of nanomaterials can also enhance the toughness of the hair, improve the water resistance, anti-ultraviolet function, anti-static function and heat capacity of the dye.