Yuan Lei's Little Knowledge | Sericite Powder of Mica Powder

Release time:

2024-01-29 09:34

Sericite powder, a kind of mica powder, it belongs to the silicate mineral with layered structure.



◆ Physical and chemical properties ◆

Sericite belongs to monoclinic crystal, the crystal is scaly, with silk luster (muscovite is glass luster), pure block is gray, purple rose, white, etc., diameter-thickness ratio> 80, specific gravity 2.6-2.7, hardness 1-3, rich elasticity, bendable, good abrasion resistance and wear resistance; Heat-resistant insulation, insoluble in acid and alkali solution, stable chemical properties.

Test data: elastic modulus 1502-2134MPa, heat resistance 500-600 ℃, thermal conductivity 0.419-0.670W.(m.K) -1, electrical insulation 2000kv/mm, radiation resistance 5*10 14 thermal neutron/cm2 to illuminance.

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 has a variety of characteristics of mica minerals and clay minerals.


◆ Product Application ◆

▼ Rubber field

The inorganic fillers commonly used in the rubber industry include calcium carbonate, talcum powder, clay, etc. They improve some functions of rubber products while also weakening some properties, and sericite products are used as multifunctional fillers for rubber products. Various properties. The unique structure of high diameter to thickness ratio improves the reinforcement effect, the excellent flaky crystal shape greatly improves the air tightness, the polarizing effect of its own mineral crystal and the interference effect of interlayer water molecules, effectively shielding ultraviolet, microwave and infrared rays, and greatly improving the aging resistance of the product.




▼ Plastic field

Plastic mica powder has the characteristics of high diameter-thickness ratio, high temperature resistance, acid and alkali resistance, wear resistance, etc., and is a natural functional powder filling material. Sericite is evenly dispersed in the plastic, the object has good fluidity, easy extrusion granulation and injection molding, which is conducive to industrial production. Sericite has good compatibility and can be well compatible with other filling materials such as talc, glass fiber, glass powder, microbeads, wollastonite fiber and silica powder in plastics. At present, sericite is mainly used in PP, thermoplastic polyester, PC, PE, poly methyl pentene, PA, unsaturated polyester, phenolic plastics, PU, etc.



▼ Coating field

Coating mica powder is a new type of functional green environmental protection filler, unique two-dimensional sheet barrier, UV shielding, chemical structure stability and other functions to effectively improve the film permeability, weather resistance, wear resistance and corrosion resistance, in addition, does not contain any radioactive elements, in line with the trend of green environmental protection in the field of coatings. It is widely used in exterior wall coatings, anti-corrosion coatings, powder coatings, high temperature resistant coatings, insulation coatings, waterproof coatings, road sign coatings, radiation protection coatings and some special coatings, such as ship coatings, spacecraft thermal control coatings and food utensils coatings.



▼ Electronic field

Sericite powder can be used as a special functional filling material for copper clad laminate, and can also be used for electronic potting glue, epoxy resin castable, plastic sealing material, LED packaging material, electronic components, etc.; it can significantly improve the performance of the material, reduce the material cost, and has a significant cost-effective advantage.


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