Different performance requirements, how to choose a matting agent?

Regarding the choice of matting agent, we have to choose it according to the actual situation, such as dry film properties, which require transparency, paint film smoothness, scratch resistance and weather resistance; and application characteristics, such as viscosity, anti-settling, degree of re-dispersion and gloss consistency etc.

Matting agent selection - different performance requirements

1. Ideal extinction efficiency

(1) Choose a product with a larger average particle size. The larger the average particle size of the matting agent, the higher the matting efficiency. However, if the particles are too large, the surface of the paint film will be too rough, affecting the feel and appearance.

(2) Select products with higher porosity (pore volume). The higher the porosity, the higher the powder content per unit weight and the better the matting performance.

2. Ideal transparency

(1) Choose a product with a smaller average particle size. In the case of the same amount added in the formula, the smaller the average particle size of the matting agent, the better the transparency of the paint film, but the corresponding matting efficiency will also decrease. It should be pointed out that the content of fine powder is too high, which will negatively affect the transparency. influences.

(2) Surface treatment. Due to the different types of surface treatment of the matting powder, it will affect the wetting and dispersibility of the matting powder and the base material, which will affect the transparency of the paint film. Therefore, it is necessary to adjust the matching between the matting powder and the base material, which can be improved by adding wetting and dispersing additives if necessary. At the same time, it is also necessary to pay attention to whether there are other factors that lead to the deterioration of the transparency of the paint film, such as additives with poor compatibility or poor pigments.

3, ideal smooth effect

(1) Usually, the matting agent whose surface is organically treated will feel better than the one without treatment.

(2) Particle size and particle size distribution. Generally speaking, the finer the particles of the matting agent, the finer the hand feel in the paint film. The narrower the particle size distribution, the fewer large particles, and the better the hand feel to a certain extent.

4. Ideal suspension

Generally speaking, with the prolongation of coating storage time, the matting agent will appear delamination and precipitation to a certain extent, and the anti-settling performance of the product whose surface has been organically treated will be better. Therefore, when designing the formula, we should consider how to avoid the precipitation problem of matting powder and add appropriate anti-settling additives.

5. Ideal surface scratch resistance and wear resistance

If the surface of the matting agent is organically treated, the scratch resistance and abrasion resistance of the paint film will be improved to a certain extent.

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