Sericite, or fine-grained muscovite, is a flaky-structured, hydrated silicate mineral. It has a low potassium content and a high water content, as compared to muscovite. It can be applied in various fields.

1. Sericite in the field of coatings

Superfine sericite powder is a new type of functional filler that is widely used in the field of paints and coatings. Sericite powder is fine-flaked, smooth-faced, has a large aspect ratio, high whiteness, stable chemical properties, light weight, smooth texture, insulation, and radiation resistance. Therefore, it is a good color filler for various high-end paints, anti-rust, fireproof, and anti-corrosion coatings. Because of the layered structure of sericite, the dye particles can enter the interlayer of the crystal lattice of sericite, which can keep the paint film from fading for a long time.

Sericite has a similar chemical nature to traditional coating fillers such as talc powder, kaolin, and silica stone. Both are silicate minerals, but its unique structure and special properties affect the relevant properties of the coating in use, such as flat reinforcement in the coating. In the formulation of coatings, replacing traditional inorganic fillers with superfine sericite powder can significantly enhance the strength of the coating film and the adhesion of the coating film to the substrate, improve the integrity, weather resistance, and acid-base resistance of the coating film, and improve the smoothness of the paint film.

Application to exterior wall coatings can improve its heat resistance, stain resistance, and radiation resistance.

In high-end paints, wet-ground sericite powder can be added to replace zinc powder, aluminum powder, and titanium powder. Sericite powder is widely used in standard linseed oil household paints, styrene emulsions, propylene, acrylate emulsions, and acrylic emulsions. Indoor wall paints and automotive, motorcycle, and marine paints.

After adding superfine sericite powder to steel structure fireproof coatings, the relevant properties are significantly improved. Sericite powder modified with titanate coupling agent can increase the heat resistance limit of fireproof coatings by 25 °C, the water resistance limit from 28 hours to 47 hours, and the adhesion strength from 0.45 MPa to 1.44 MPa. Adding an appropriate amount of superfine sericite powder to rust conversion coatings can enhance the coating film's heat resistance, weather resistance, water resistance, corrosion resistance, and overall mechanical properties.

After adding superfine sericite powder to anti-corrosion coatings, the surface hardness, toughness, adhesion, and impact resistance of the coating film are all improved. At the same time, it can replace or partially replace titanium dioxide in the coating formulation to reduce costs without affecting the performance of the coating.

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