METHOD FOR PREPARING AQUEOUS CARBON BLACK AQUEOUS DISPERSION AND METHOD FOR MANUFACTURING AQUEOUS DISPERSION OF OXIDE CARBON BLACK

摘要

The present invention provides a method for easily producing an aqueous dispersion of carbon black oxide capable of highly eliminating polyvalent metal ions and exhibiting excellent dispersion stability. An aqueous alkaline metal is mixed with an aqueous slurry of an oxidized carbon black having one or more anionic functional groups on the surface thereof in the presence of at least one selected from a water-soluble chelating agent or a salt thereof, and the mixture is heated or neutralized by heating with an alkali metal hydroxide A neutralizing step of mixing at least one selected from a water-soluble chelating agent or a salt thereof, and a separating and removing step of separating and removing the polyvalent metal ion chelate complex from the mixed solution obtained in the neutralizing step using a separation membrane By weight based on the weight of the carbon black.