Mica Powder for Paint Industry

Mica

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Mica is a general term for hydrated aluminum silicate minerals with a layered structure and containing metallic elements such as lithium, sodium, potassium, magnesium, aluminum, zinc, iron, and vanadium. Muscovite, biotite, phlogopite, and lepidolite are the most common types of mica. Sheet and ground muscovite and phlogopite are the most common forms of mica used as industrial raw materials, and sericite is also used. Muscovite is used in the greatest quantities, followed by phlogopite. Mica is a good electrical insulator, is transparent, separates into flakes easily, has excellent chemical stability, has good elasticity, and can maintain its superior physical and chemical properties even at high temperature.

Mica is an extremely important insulating material, and is widely used in electronics, electrical machinery, telecommunications, electrical devices, aerospace, transportation, instruments, metallurgy, building materials, light industry, defense, and other high-tech areas. Due to growing demand for capacitors and electrical device insulation and support materials and dielectric materials starting in the 1970’s, sheet mica was overtaken by the replacement mica paper made from crushed mica. The emergence of integrated circuits induced a fundamental change in consumption; although demand for sheet mica fell sharply, demand for crushed mica rose steadily. Thanks to ongoing progress in technology, mica is now used in a growing range of applications, including building materials, geological prospecting, lubricants, paints, foods, and cosmetics. Crushed mica and sericite have very bright futures.

Chemical composition: Muscovite has the chemical formula KAl2(AlSi3O10)(OH)2; magnesium-rich muscovite has the formula (Fe2+, g)(Fe3+,Al3+)(AlSi7O20)(OH)4; sericite has the formula KAl2(Si,Al)4O10(OH,F) 2; and phlogopite has the formula KMg3(AlSi3O10)(F,OH)2.

Mica is an aluminum silicate mineral with a continuous tetrahedral silicate structure. Thin flexible sheets are easily peeled from pieces of mica; these sheets are soft, transparent, and colorless. Large pieces of mica are translucent and sometimes grayish, brownish, pale green, or pale red in color. Mica has a vitreous to silky or pearly luster; hardness is 2.5-3 and specific gravity 2.75~3.0. It is resistant to acids.

Mica Powder

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Mica’s superior dielectric performance includes relatively high insulating strength and electrical resistance, relatively low dielectric losses, and good anti-arcing and anti-corona characteristics. It is resistant to high temperatures and sudden temperature changes; it is heat resistant, a thermal insulator, resistant to acids and alkalis, compression resistant, and peels readily into sheets. Furthermore, mica has a hard texture, good mechanical strength, a good luster, stable physical and chemical characteristics, and possesses excellent flexibility, toughness, heat resistance, sound insulating characteristics, and a small thermal expansion coefficient. Sheets of mica are smooth and glossy, and have a regular form, a high diameter to thickness ratio, and strong bonding ability. Mica powder has even better sliding and properties. Due to their many excellent properties, mica and mica powder are widely used in the electronics, aerospace, and electrical machinery industries. They are also commonly used in paints, coatings, plastics, linoleum, paper, oil drilling, and cosmetics. The addition of mica to paint can prevent UV radiation, light, or heat from damaging the paint film, increase acid and alkali resistance, enhance insulating performance, boost resistance to freezing, increase corrosion resistance, toughness, and tightness, reduce air permeability, and prevent spotting and crazing. Mica powder can also be added to external building materials to enhance rain resistance and warming/cooling insulation. Mica powder mixed with mineral wool and a resin coating can be applied to concrete, stone, or brick outer walls for a decorative effect. Mica powder is also used in linoleum, mortar, and adhesives. Mica can be added to rubber products as a lubricant and mold release agent. It is used as a filler boosting electrical insulation, heat resistance, and acid/alkali resistance. Mica is also used to make mica paper, mica panel, mica ceramics, pearl mica pigments, and cast mica products.

Uses

Mica powder is widely used as a raw material in mica ceramics, a filler in plastic, rubber, building materials, and paints, as a protective layer on welding rods, as an additive in drilling mud, and also in coatings, paints, fire safety products, linoleum, paper, oil drilling products, and cosmetics.

1. Acts as a sealant when used as a drilling mud additive.
2. In building surface materials, it protects against rain, insulates against the heat or cold, and provides decorative effects.
3. A coating of mica powder mixed with mineral wool and resin can provide a decorative layer on concrete, stone, and masonry outer walls.
4. Used in the protective layers on welding rods, wires, and cables.
5. Used as a filler in linoleum, pipe mortar, and adhesive. It can be used to make decorative coatings and sound-a sorting plaster. Used as a filler in ceiling panels and concrete and cement mortar; increases the strength of cement mortar.
6. When used as a filler in rubber products, mica acts as a lubricant and provides electrical insulation, heat resistance, and acid/alkali resistance. It serves as a covering agent in tire reconditioning, and can provide lubrication between tire and inner tube. Increases mechanical strength, toughness, adhesion, and anti-aging and anti-corrosion properties when used in rubber and plastic.
7. When used in paint, mica can increase reflectivity and heat resistance, reduce damage from UV radiation, light, and heat, boost resistance to acids and alkalis, increase electrical insulation, and provide a bright and attractive paint layer. It can also enhance their ability, corrosion resistance, toughness, and tightness, reduce air permeability, and prevent spotting and crazing. It increases resistance to oil and water, and prevents pigments from settling. It is an important filler in anti-corrosion coatings. It is used in the coating applied to the model when casting metal, and is also used in coatings for electroplating tanks. It helps remove oil when used as a filler in cosmetics. It is an additive in anti-freezing and anti-sun paints, and is mixed with sealing paint-on plaster. It is used in the powder in dry fire extinguishers.
8. Mica can dramatically enhance the durability of paint and coatings. It increases water resistance, enhances adhesion between the paint and the substrate, boosts paint strength, and improves appearance.

Read more about Mica’s characteristics.

Learn more about Mica’s chemical analysis and physical properties and how it compares with other conducting materials.