Matting Principle And Application Of Powder Coating

Matting principle and application of powder coating. Depending on the application, powder coating needs semi-gloss or matte products. In order to reduce the gloss of the coating, commonly used matting agents include matting wax powder, talcum powder, ultrafine silica, low molecular thermoplastic resin, etc.

Factors affecting gloss:

(1) Roughness of coating surface The gloss of an object surface is closely related to the roughness of the object surface. When light hits the surface of an object, part of it will be absorbed by the object, part of it will be reflected and scattered, and part of it will be refracted. The smaller the roughness of the object surface, the more light will be reflected and the higher the gloss. On the contrary, if the surface of the object is uneven, the more light will be scattered, resulting in a decrease in gloss.

(2) Film formation process of coating After the paint is applied to the surface of the object, it solidifies into a film through the volatilization of the solvent. The coating film formation process is crucial to the surface roughness and gloss of the coating.

(3) Particle size and distribution of pigments and fine particles. The particle size and particle size distribution of pigments (fillers) in coatings are one of the important factors affecting the gloss of coatings. People have found in research that only when the diameter of pigment particles is less than 0.3μm can a high-gloss coating be obtained.

Wax micropowder is a more common matting agent, which belongs to the organic suspension type matting agent. After the coating is applied, as the solvent evaporates, the wax in the coating is precipitated and suspended on the surface of the coating as fine crystals, forming a rough surface that scatters light and plays a matting role. The characteristics of powder coating matting wax powder are easy to use, and it can give the coating a good feel and water resistance, moisture resistance, and anti-fouling properties.