Like ordinary printing inks, water-based inks usually have colorants, binders, auxiliary agents and other components. Colorants are the colorants of water-based inks, giving them a specific color. In flexo printing, in order to make the printing color bright, the colorant is generally selected from the pigments with good chemical stability and high coloring power; The binder consists of water, resin, amine compounds and other organic solvents.
Resin is the most important component of water-based ink. Generally, water-soluble acrylic resin is used. The component of binder directly affects the adhesion function, drying speed, anti stick performance, etc. of the ink, and also affects the gloss and ink transmission of the ink. Amine compounds mainly maintain the alkaline PH value of water-based ink, so that the acrylic resin can provide better printing effect. Water or other organic solvents are mainly dissolved resins, Adjust the viscosity and drying speed of the ink; Auxiliary agents mainly include defoamer, blocking agent, stabilizer, diluent, etc.