Yuan Lei tells you about the application of sericite powder in coatings.

Release time:

2024-01-29 09:35


Yuan Lei tells you about the application of sericite powder in coatings.


Sericite is a kind of mica, which belongs to silicate minerals with layered structure. Sericite has a very wide range of uses, used in rubber, plastics, paint, ceramics, insulation, cosmetics, pigments, papermaking, metallurgy and other industries. The crystal of sericite is scaly, and the crystal aggregate is massive, gray, purple rose, white, etc., with silky luster. In addition, the chemical composition, structure and structure of sericite are similar to kaolin, and it has some characteristics of clay minerals, that is, it has good dispersion and suspension in water medium and organic solvent, fine white particles and viscosity. Therefore, sericite powder has a variety of characteristics of mica minerals and clay minerals, its application in coatings, can greatly improve the weather resistance of the film, water permeability, enhance the film and matrix adhesion and film strength, improve the film appearance. At the same time, the dye particles are easy to enter the lattice layer of sericite powder, so as to maintain the color for a long time without fading.



Comparison of sericite and other inorganic filler applications:

Packing light calcium powder Talcum powder Kaolin Wollastonite sericite
main properties of mineral Shape Granular granular flake granular flake acicular flake
Specific gravity g/cm³


2.65 2.60 2.62 2.61 2.62
Whiteness% 90-95 90-97 80-90 81-90 75-85
Acid and alkali resistance Poor Medium Medium Poor Good.
Function in paint covering power General Medium Medium Poor Good.
coating film strength General Medium General Good. Good.
Suspension General Good. Good. Poor Good.
Water permeability resistance Poor Good. Medium Medium Good.
anti-aging Poor better Medium Medium Good.
Price Low Good. Medium Medium medium high
As can be seen from the above table, compared with other inorganic fillers, sericite shows great advantages in both performance media and application functions in coatings. Therefore, sericite is particularly suitable for paint additives, some unique paint filler. It can greatly improve the aging resistance of the coating, enhance the weather resistance of the coating, and also has the characteristics of preventing cracking, discoloration, delayed chalking, resistance to atmospheric aging, and strong resistance. Therefore, it is widely used in waterproof coatings, anti-rust coatings, insulating coatings, fireproof coatings, road sign coatings, anti-pollution coatings, anti-high temperature coatings and other special coatings. It is an indispensable raw material additive in the production process of coating enterprises.
In addition, the application advantages of sericite are very significant, mainly reflected in the following three points:
1. The diameter and thickness of sericite are relatively large, which can be as high as 80 or more. Therefore, after being added to the coating, it will be arranged in sheet-like layers in the formed coating film. This not only does not improve the anti-penetration of the coating, but also improves the scratch resistance of the coating.
2. Before and after the addition of sericite, the test results of the coating film show that the hardness of the coating film with sericite coating is more than twice that of the ordinary coating film without sericite coating. In addition, the boiling water resistance of sericite coatings is significantly higher than that of ordinary coatings.
3. Sericite coatings have higher weather resistance than ordinary coatings in practical applications, and can greatly extend the service life of coatings.

It can be seen that sericite plays a very important role in coating applications, bringing higher performance and architectural applications to coating products. For this reason, Yuanlei powder has successively introduced five series of rubber-plastic grade sericite powder and wet-process grade sericite powder for sericite powder, which meets many requirements of different production specifications of coating manufacturers.




Tell, paint, mica, application, mica powder, mineral, general, flake, medium, granular

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