Name | Muscovite, Research Grade |
Synonyms | C-3000 Muscovite, Research Grade |
Physical and Chemical Properties | Physical and chemical properties of mica powder can be used by water washing, impurity removal, purification, through a special process of crushing, drying, grading to obtain high-quality powder with good whiteness, large diameter-to-thickness ratio, smooth surface, uniform particle size, widely used in rubber, plastics, coatings, paints, cosmetics and so on. |
Use | It is used as a filler for paper making, plastics and rubber, and is also a raw material for impact resistant plastics, cosmetics and drilling mud. |
history of use
Mica powder is one of the colors of murals. Dunhuang murals use mineral colors as pigments, such as azure, azure, earth red, cinnabar, kaolin, etc., which are all natural and are no different from traditional painting materials. Only Cave 112, created during the reign of Tubo, used a shiny white to paint people's skin, making the murals produce a special effect of shining. In the late 1970s, X-ray fluorescence analysis determined that this color was mica powder. It turned out that the mica mine in the Mogao Grottoes valley was used as the material and ground into fine powder for the color of the mural. Mica powder is a painting pigment, which is not recorded in history. Mica powder has not been used in large quantities in murals, but this special color was indeed used in Dunhuang murals.
mica
Mica is a general term for mica minerals, which refers to layered aluminosilicates containing potassium, aluminum, magnesium, iron, lithium, etc. Mica is a rock-forming mineral widely distributed on the earth. It is common in igneous rocks, sedimentary rocks and metamorphic rocks. It is one of the familiar minerals in daily life. The appearance is mostly flaky or scaly, often aggregated together to form a collection. It has various colors and complex components. Mica has a very complete cleavage, which can be lifted piece by piece with nails, and the sheet is elastic. Usually under sunlight, its luster resembles glass or pearls. According to the different composition and color, mica can be divided into four types: muscovite KAl2[AlSi3O10](OH)2, biotite K(Mg,Fe)3 [AlSi3O10](OH,F)2, phlomica KMg3[AlSi3O10] (F,OH)2 and lepidolite KLi1.5Al1.5[AlSi3O10] (F,OH)2. Muscovite is colorless, biotite is black or brown-black, phrivite is yellowish brown or golden yellow, lepidolite is often rose-colored or light-colored scaly pieces. Muscovite and biotite are the most common in nature. Pure muscovite and phemite have excellent insulation to electricity and heat. They are the main insulating materials in the electrical and electronic industries, such as the manufacture of electronic tubes, mica paper, capacitors, rectifiers, motors, etc. Lepidolite is one of the main raw materials for extracting lithium. Lithium is an important fuel for hydrogen bombs, rockets, nuclear submarines and new jet aircraft. Lithium is also used in the military industry as a red luminous agent for flares and flares. In recent years, scientists have used a "mineral acid" to treat finely ground muscovite and phlomica to make "silicon plastic" with pores like plastic. It not only has good insulation, but also can sound and heat insulation. It is not hot when it is red. If silicon plastic containing carbon 15% is added to the rubber, the rubber will change from insulator to conductor, and the automobile belt made of it has antistatic properties. If polyethylene is filled with 40% mica, its impact strength can be improved by 40-70%. Mica powder is mixed into the paint to make flash paint, which is superior advertising paint and decorative paint.
surface modification of mica powder
The surface modification of mica powder can be divided into two processes: organic surface modification and inorganic surface coating modification.
Organic surface modification is mainly aimed at mica powder used as reinforced fillers for polymer materials such as polyolefins, polyamides and polyesters. The aim is to improve the compatibility between mica powder and polymer base and improve its application performance. Commonly used surface modifiers are silane coupling agents, butadiene, zirconium aluminate, silicone (oil), etc. After surface treatment, mica powder can improve the mechanical strength of the material and reduce the molding shrinkage. Organic surface modification processes are dry and wet.
The mica used for surface modification is preferably wet milled mica powder, and the most effective surface modifier is aminosilane. However, the mixed use of two surface modifiers is often more effective, especially to improve the mechanical properties and heat aging characteristics of polypropylene composites.
inorganic surface modifiers mainly refer to mica pigments used as coatings, inks, artificial leather, cosmetics, plastics, rubber, toys, printing and decoration, papermaking, etc. The purpose is to endow mica powder with good optical and visual effects, making the products more colorful and elegant, thus improving the application value of mica powder. Commonly used surface modifiers are titanium oxide, chromium oxide, zirconia, etc. The trade names of this surface-modified mica powder are "pearlescent mica" and "colored mica". The raw material is flaky wet milled mica powder.
Use of mica powder
The fineness of mica powder varies according to different uses, and is generally divided into four levels: coarse, medium, fine and ultra-fine. Mica powder of 8~12 mesh is mostly used in roofing materials such as linoleum, and is also used for cable wrapping and similar purposes. 40~60 mesh mica powder is used for the coating of electrode. 60~120 mesh mica powder is the basic raw material for the production of mica ceramics. Mica powder of 100 mesh or finer is used as an admixture for paint, filler for rubber, covering agent and lubricant, and filler for plastic. Ultrafine mica powder of 200 mesh and below 325 mesh is used as the matrix of mica titanium pearlescent pigment.
mica powder is also used as a material for closing boreholes when drilling oil wells, as a model coating when casting metal, as a polishing agent for aluminum products, as a coating for electroplating bath, as a filler in degreasing powder in cosmetics, as an additive in antifreeze and anti-yang paint paste, as a mixture of sealing paint ash, and as a powder suspending agent in dry powder fire extinguishers in fire fighting equipment.
performance
Mica powder has high insulation performance, heat resistance, acid and alkali corrosion resistance, and small thermal expansion coefficient. No matter how broken, it is flaky, with good elasticity and toughness. Mica powder has good sliding property, strong coverage and high adhesion.