Attagel® inorganic thixotropic thickeners can replace some synthetic polymer thickeners
– When synthetic polymer thickeners are used, coatings suffer from liquid delamination, pigment settling, lack of coverage and color strength, etc.
– Attagel® thickeners can improve the liquid stratification of coatings, help the pigments to suspend, improve coverage and color strength, and reduce costs.
The intensity sequence of the interaction between inorganic pigments and various functional groups is roughly as follows: when the surface of the pigment is acidic (SiO, etc.), amine carboxylic acid>alcohol>phenol: when the surface of the pigment is neutral (AlzO;, Fe gO, Etc.), carboxylic acid≥amine≥phenol alcohol; when the surface of the pigment is alkaline (MgO, etc.), carboxylic acid>phenolamine>alcohol.
It is not difficult to see from the above examples that the properties of the resin, low molecular weight polyamide wax especially acid and alkalinity, will have a great influence on the adsorption of pigments, especially inorganic pigments. In order to improve the wetting and dispersing efficiency and storage stability of the pigments, wetting and dispersing are usually used. Agent. In order to better improve the application effect of the dispersant, we must pay attention to the influence of various factors on the pigment absorption and dispersant.
The interaction between the inorganic pigment and the wetting and dispersing agent with functional groups will be affected by the polymer with active functional groups. The influence of resin. If the resin and the dispersant have the same adsorption center on the surface of the pigment, then the resin and the dispersant will have competitive adsorption. Who can adsorb on the surface of the pigment first depends on who has a strong affinity for the active groups on the surface of the pigment.
The strong one is preferred. Once it occupies the surface, chemical adsorption occurs, and desorption is difficult. For example, the surface of the pigment is acidic, the resin contains amino groups, which is basic, and the dispersant is cationic and contains amino groups. If the basicity of the resin is stronger than that of the dispersant, it will be difficult for the dispersant to adsorb on the surface of the pigment. The effect cannot be better played out.
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