▎ 摘　　要

NOVELTY - Composite dispersant comprises distilled water, non-ionic surfactant and wetting agent, where the non-ionic surfactant is Tween(RTM: Polysorbate) compound, and the wetting agent is hydrocarbyl sulfate compounds and hydrocarbyl sulfonate compounds. USE - The composite dispersant is useful in mixed electroplating solution (claimed). ADVANTAGE - The method can effectively block or slow down the agglomeration of graphene in the dispersion, has simple operation, and can effectively block or slow down the agglomeration of graphene in the dispersion. The composite dispersant provides a mixed electroplating solution in which graphene is uniformly dispersed and stably, provides adsorption of lipophilic groups on the surface of the graphene particles to form a surrounding layer, which can effectively block or slow down the agglomeration of graphene in the dispersion, and has synergistic components. The mixed electroplating solution improves: graphene-silver mixed coating of electroplating products, and uniformity of alkene dispersion. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing composite dispersant, comprising adding a hydrocarbyl sulfate compound and Tween(RTM: Polysorbate) compound into distilled water at 40-60° C, and stirring at 5-10 minutes, (2) adding the hydrocarbyl sulfonate compound to the mixture obtained in the step (1), supplementing distilled water, and stirring for 5-15 minutes to prepare a compound dispersant; (2) mixed electroplating solution comprising the composite dispersant, a silver basic aqueous solution and graphene, where the silver basic aqueous solution includes potassium cyanide and silver ions; and (3) producing preparing mixed electroplating solution, comprising (i) preparing a silver basic aqueous solution comprising 90-200 g/l potassium cyanide, and 15-50 g/l silver ions, (ii) adding the composite dispersant and graphene into the silver basic aqueous solution and stirring, (iii) supplementing the silver basic aqueous solution and stirring to prepare a mixed electroplating solution, where the mixed electroplating solution comprises 15-50 ml/l composite dispersant and 1-20 g/l graphene.