Organic pigments possess low surface polarity and crystal structures rich in aromatic rings; due to the large specific surface area of their primary particles, they tend to form dense aggregates during the milling process. Unlike inorganic pigments, which rely on electrostatic stabilization, organic pigments in water-based systems are susceptible to having simple charge repulsion screened by components such as electrolytes and polyols. Improper dispersant selection can lead to issues such as hindered viscosity reduction during milling, insufficient tinting strength, and pigment paste coarsening during storage; furthermore, once incorporated into the base medium, it may trigger paint film defects such as pigment floating, flooding, and hue shifts. The key to selecting a dispersant for organic pigments lies in the compatibility between the anchoring groups and the pigment crystal surface, enabling the polymer segments to establish a protective layer with sufficient steric hindrance.

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Selection Guidelines for Anti-Oil Additives in Water-Based Coating and Ink Systems

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What causes sedimentation in water-based inks, and how should anti-settling dispersants be selected?

A comprehensive and precise dispersant selection and implementation solution covering all water-based application scenarios

General-Purpose Dispersants

Technical specifications and application guidelines for selection of water-based defoamers

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Reference Manual for Selection of Specialized Dispersants for Digital Inkjet Inks

Technical Guide for Selection of Defoaming Agents in Water-Based Dip Coating Systems