The particle size of silica filler has a great influence on the gloss of the coating film.

TodayKain Chemical takes everyone Learn about the application of silica matting powder, I hope it will be helpful to you.

Added ultra-fine silica black Fillers such as talc and talc can significantly reduce the gloss. In particular, the particle size of the filler has a great influence on the gloss of the coating. And the larger the particle size, the lower the gloss. Therefore, it is necessary to pay attention to increasing the amount of filler, otherwise the smoothness and mechanical strength of the coating film will be reduced. In epoxy powder coatings, the effect of calcium carbonate particle size on the gloss of the coating film is shown in the table. Adding ultrafine silica and kaolin to acrylic and polyester powder coatings can produce matt coatings.

In addition, waxes such as polyethylene paraffin and hydrogenated castor oil are added Matt paint is also available.

Principles and applications of matting in coatings: extender pigments, such as diatomaceous earth, kaolin, fumed silica, etc. They are all functional fine materials specially used as matting agents and are inorganic filled matting agents. As the paint dries, the tiny particles will form a micro-rough surface on the surface of the paint, reducing light reflection and giving it a matte appearance. The matting effect of this type of matting agent is restricted by many factors. Let’s use silica as an example. When it is used as a matting agent, factors such as the pore volume of the particles, the average particle size and particle size distribution, the dry film thickness, and whether the particle surface has been treated will all affect the matting effect. Moreover, experiments have proven that silica with larger pore volume, uniform particle size distribution, and matching particle size and dry film thickness has better matting performance.