Preparation method for hair dye based on graphene

The invention specifically relates to a preparation method for a hair dye based on graphene, belonging to the technical field of hair dyes. The preparation method comprises the following steps: subjecting amino-containing methyl dialkoxysilane, mercaptopropyl methyl dialkoxysilane, octamethylcyclotetrasiloxane and a sealing agent to an equilibrium reaction to obtain amino mercapto silicone oil; subjecting amino mercapto silicone oil, N,N-dialkylaminoethyl methacrylate and isopropanol to a thiol-ene click reaction in the presence of a photoinitiator and under the ultraviolet irradiation so as to obtain amino copolymerized silicone oil; subjecting amino copolymerized silicone oil and a quaternization reagent to a quaternization reaction so as to obtain amino-containing quaternized silicone oil; and dispersing graphene oxide prepared by using the Hummers process in deionized water and then adding the amino-containing quaternized silicone oil for treatment so as to obtain the hair dye based on graphene. The hair