Select the dispersant

Time：

2021-11-09

Dispersants, as the name suggests, are substances that rationally disperse various powders in solvents. Through certain electrostatic repulsion principles or high-molecular steric hindrance effects, they enable various solids to be stably suspended in the solvents (or dispersions).

In the process of paint production, pigment dispersion is a very important production link, which directly affects the storage, application, appearance and performance of the paint film of the paint. Therefore, the reasonable selection of dispersants is a very important production link. However, the quality of the dispersion of coating slurry is not only related to the dispersant, but also to the formulation of the coating formula and the selection of raw materials.

Low-molecular wax types

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Low-molecular wax types

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Addition curve method

Gradually drop a relatively concentrated pigment fraction solution into a thick water slurry made of a certain amount of pigment/pigment mixture under stirring, and measure the viscosity each time it is added. The lowest point of the quantity/viscosity curve used as a pigment dispersant represents the optimal dosage of the dispersant.

2025

06-05

Daniel Flow point determination method

Gradually add the water solvent of the dispersant to a certain amount of pigment/pigment mixture with a dropper, and carefully grind it evenly with a small scraper until the ground pigment paste can flow down from the scraper. Calculate the ratio of the pigment fraction to the pigment.

2025

06-05

The principle of double electric layers

The dispersants used in water-based coatings must be water-soluble and they are selectively adsorbed onto the interface between the powder and water. The commonly used type is anionic. They ionize in water to form anions and have certain surface activity, which are adsorbed by the surface of the powder. After the powder particles adsorb the dispersant on their surface, a double electric layer is formed. The anions are closely adsorbed by the particle surface and are called surface ions. Ions with opposite charges in a medium are called counterions. They are electrostatically adsorbed by surface ions. Some of the counterions are relatively tightly bound to the particles and surface ions, and they are called bound counterions. They become a moving whole in the medium, carrying a negative charge, while another part of the counterions surround them. They are called free counterions and form a diffusion layer. In this way, a double electric layer is formed between the surface ions and the counterions.

2025

06-05

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