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Why does the dispersant work? How does the dispersant work?

Author: Date of issue: 2021-06-19

Why does the dispersant work? How does the dispersant work?

The dispersant molecule contains an anchor group part and a stabilizing part. The role of the anchoring group is to provide a strong enough binding force with the pigment and filler particles, and the dispersant molecules do not fall off the surface of the particles, which is the prerequisite for the dispersant to function. The function of the stabilizing part is to stabilize the pigment aggregate particles dispersed by mechanical force through electrostatic repulsion and steric hindrance in the liquid phase, and prevent particle agglomeration.

In organic solvents, the stable part of the dispersant stabilizes the dispersed pigment particles through steric hindrance. When the distance between the particles adsorbed by the dispersant is less than the size of the solvation chain, the solvation chains squeeze each other and the entropy decreases. In water, the stabilizing ionic groups will be ionized, forming an electric double layer around the particles, and the electrostatic repulsion prevents the particles from agglomerating; if the stabilizing effect is non-ionized polyether, the polyether will stabilize the dispersion through steric hindrance. Pigment particles.

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