The role of mica powder in coatings
Contribution of mica powder to properties of coatings1., mica powder two-dimensional lamellar crystal structure: blocking the penetration of water vapor, improve the film's water vapor, salt spray resistance, improve the anti-corrosion properties of coatings.2., mica powder dense network structure: parallel arrangement, overlap each other, improve the film strength, anti cracking, improve the mechanical properties of coating.3., mica powder fine chemical inertness: acid, alkali, high temperature, electrical insulation strong, improve coating corrosion stability and electrical insulation.4. sericite powder clay ore characteristics: suspension in organic solvents, anti sinking, easy to disperse, enhance the storage stability of coatings.5. mica powder ultraviolet function: absorb ultraviolet ray, protect the polymer chain in coating, enhance the weather resistance of coating.
Function and mechanism of mica powder in minerals1. mica powder with high structure crystal flake diameter thickness ratio, no matter to what extent are ultrafine lamellar structure, inorganic mineral in coatings on coating strength, the effect of physical shape and mineral covering capacity, according to the general decline along the column.2. mica mineral surface active gene, easy and molecular chain combination, even wrapped in the film, arranged in parallel, upper and lower layer overlapping mesh structure to form a compact film inside, thus greatly improve the mechanical properties of coating film and anti permeability.3. mica has unique ultraviolet function, can resist more than 8 ultraviolet rays, improve the weatherability of the paint film.
Mica powder is a kind of natural fine grained muscovite, which is flaky, silky, with a diameter thickness ratio of less than 80, a specific gravity of 2.6-2.7, and a hardness of 2-3. Silk mica crystal chemical formula: K0.5-1 (Al, Fe, Mg) 2 (SiAl) 4O10 (OH) 2 - nH2O, {001}, which can be split into thin sheets, elastic, flexible, heat up to 600 degrees Celsius, acid and alkali resistance, electrical insulation and strong abrasion resistance and good wear resistance. The chemical composition, structure and structure of sericite powder are similar to kaolin, so sericite has the characteristics of clay minerals, and has good suspension in water medium and organic solvent.
