▎ 摘　　要

NOVELTY - Composite dispersant comprises distilled water, non-ionic surfactant, anionic surfactant, and wetting agent. The anionic surfactant is Tween(RTM: Polysorbate) compound and alkyl sulfate salt compound, respectively. The dispersant is prepared by stirring distilled water at 40-60° C for 5-15 minutes. The composite dispersant comprises 1-10 wt.% non-ionic and anionic type surfactant, 1-10 wt.% wetting agents, and distilled water (balance). A mixed plating solution comprises silver alkali aqueous solution and graphene. The silver base aqueous solution includes potassium carbon nitride and silver ions. USE - The composite dispersant is useful in a mixed electroplating solution, which is useful as a composite electric contact material with wear resistance, thermal conductivity, and mechanical properties. ADVANTAGE - The composite dispersant is capable of blocking or slowing the agglomeration of graphene in the dispersion. The method is simple in operation, and disperses the mixed electroplate liquid and the graphene uniformly and stably. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparing Composite dispersant; a mixed electroplating solution; and preparing mixed electroplating solution.