The application belongs to the technical field of circuit boards, and discloses a preparation method of a
graphene conductive liquid for a circuit board hole metallization process, which takes an environment-friendly
graphene as a core material, does not add
toxic chemical reagents in a preparation process, realizes hole wall conductive layer construction through
electrostatic adsorption in application, does not involve harmful chemical reactions, and eliminates environmental
pollution from the source; meanwhile, the process does not need a
palladium catalyst, and
graphene raw materials can be prepared at low cost based on natural flaky
graphite, are matched with the characteristics of solution stability and easy maintenance (not stratified for months in natural storage), greatly reduce
reagent replacement and equipment maintenance frequency, reduce comprehensive production cost, meet global
environmental protection policy requirements, and create economic value for enterprises; through hierarchical
airflow-wet method collaborative crushing, the number of graphene
layers is accurately controlled, and in combination with a 'gradient
magnetic field-ultrasonic auxiliary
impurity removal' to improve purity, so that the conductive basic performance is guaranteed.