The sericite mica mineral is a flaky fine-grained muscovite. The structure is a dioctahedron, which consists of two layers of silicon oxytetrahedron and one layer of aluminoxy octahedron. The active oxygen and the additional anion of the tetrahedron are located in the center of the two layers of six-sided mesh to form an active crystalline water group. The cleavage is complete, and it can be turned into a very thin sheet with a large diameter to thickness ratio. The chemical composition of sericite crystals is K0.5-1(Al,Fe,Mg)2(SiA1)4O10(OH)2nH2O, which has silky luster, diameter to thickness ratio >80, white or light grayish white, with a share of 2.6. ~2.7, hardness is 2 to 3, elastic and bendable. High temperature resistance, strong chemical resistance, excellent shielding against UV rays. Its fine phosphorus flake crystal structure enhances the compactness of the coating and prevents moisture from penetrating.
The sericite has a chemical structure similar to that of kaolin, and it has many characteristics of mica minerals and clay minerals. It should be used in coatings, which can greatly improve the weather resistance of the coating film, resist water permeability, enhance the adhesion and strength of the coating film, and improve the appearance of the coating film. At the same time, the dye particles are easy to enter the lattice layer of the sericite powder, so that the color continues for a long time without fading. In addition, sericite powder also has the function of resisting algae and mildew, and is often used in ships and marine coatings abroad. Therefore, sericite powder is a multifunctional filler with excellent price-performance ratio for coatings.