¿Cómo mejoran los dispersantes a base de disolventes la estabilidad de la dispersión de los pigmentos orgánicos?
Release time: 2026-07-28
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In solvent-based coatings, inks, and plastic coloring applications, the dispersion stability of organic pigments directly determines the color strength, gloss, and storage performance of the final product. However, due to the high surface energy and strong van der Waals forces of organic pigment particles, they are prone to flocculation and sedimentation, leading to quality problems such as floating color and mottling. Solvent-based dispersants, through special molecular structure design, can effectively solve this problem, becoming key additives for improving pigment dispersion performance.
Why do organic pigments easily flocculate in solvents?
Due to their high surface energy and strong van der Waals forces, organic pigment particles are easily attracted to each other and agglomerate, leading to decreased color strength, floating color, and mottling.
How do solvent-based dispersants adsorb onto the pigment surface?
Dispersant molecules contain “anchoring groups” (such as amino, carboxyl, and phosphate esters), which strongly adsorb onto the pigment surface through acid-base interactions, hydrogen bonds, or dipole interactions, forming a strong interfacial layer.
How do dispersants prevent particle re-agglomeration?
In polymeric dispersants, anchoring groups are fixed to the pigment surface, while solvated segments extend into the solvent phase, forming a steric barrier. When two particles approach each other, the polymer chains are compressed, the system entropy decreases, generating repulsive forces that overcome van der Waals attraction, achieving “steric stabilization.”
Why do solvent-based systems rely on steric stabilization rather than charge stabilization?
Organic solvents have low dielectric constants and poor charge stabilization effects. Therefore, solvent-based formulations mainly rely on the steric hindrance effect of nonionic dispersants, preventing flocculation through osmotic pressure and physical barriers.
How to choose a suitable solvent-based dispersant?
It is necessary to match the chemical properties of the anchoring groups with the pigment surface, while ensuring good compatibility between the polymer segments and the solvent/resin system to maximize dispersion stability and color strength.
Dispersantes a base de disolventes effectively overcome van der Waals attraction between organic pigment particles through a dual mechanism of anchoring group adsorption and steric stabilization, achieving long-term dispersion stability. Choosing the right dispersant that matches the pigment surface chemistry can significantly improve tinting strength, transparency, and gloss, while also reducing grinding energy consumption, shortening production cycles, and preventing flocculation and sedimentation during storage. In industrial applications such as coatings, inks, and plastic coloring, Polywill, with years of experience in dispersant technology development, provides customers with high-performance solvent-based dispersant solutions to help optimize formulation systems and enhance product competitiveness, becoming a trusted additive supplier for many companies.
