Mica Powder

Mica powder is a non-metallic mineral that contains a variety of components, including SiO ₂ , which is generally about 49%, and Al ₂ O ₃ , which is about 30%. Mica powder has good elasticity and toughness. It is an excellent additive due to its properties such as insulation, high temperature resistance, acid and alkali resistance, corrosion resistance, and strong adhesion. It is widely used in electrical appliances, welding rods, rubber, plastics, papermaking, paints, coatings, pigments, ceramics, cosmetics, new building materials and other industries, and has an extremely wide range of uses. With the continuous development of science and technology, people have opened up new application fields.

Features and Main Chemical Components

Muscovite crystals are in the shape of hexagonal plates and columns, with flat joint surfaces, and the aggregates are in the shape of sheets or scales, so they are called fragmented muscovite. Fragmented muscovite is white, transparent and translucent, with pure texture and no spots. The diameter of sheet mica in the ore is 2-10 mm, and its molecular formula is KAl ₂ (AlSi ₃ O ₁₀ ) (OHF) 2. Its chemical composition is shown in the table below: The main chemical components of muscovite:

The main specifications of muscovite powder provided by our company are: -20＋40 mesh, -40+60 mesh, -60+100 mesh, -100+200 mesh, -200+325 mesh, -500 mesh, -800 mesh, -1000 mesh , the pass rate of 1250 mesh is above 95%, and the whiteness is >= 75 degrees.

Muscovite Powder Technical Indicators

The Use of Mica Powder

Coating Field

Coating mica powder is a new type of functional green and environmentally friendly filler. Its unique two-dimensional flake barrier, ultraviolet light shielding, chemical structure stability and other functions can effectively improve the anti-permeability, weather resistance, wear resistance and durability of the coating film. It is corrosive and does not contain any radioactive elements, leading the trend of green and environmental protection in the coating field. It is widely used in building exterior wall coatings, anti-corrosion coatings, powder coatings, high temperature resistant coatings, insulating coatings, waterproof coatings, road marking coatings, radiation protection coatings and some special coatings, such as ship coatings, spacecraft thermal control coatings and food container coatings wait.

Cosmetics Field

Cosmetic-grade mica has a unique flake structure, silky luster and smooth texture, making cosmetic powder as light and delicate as silk. The natural texture gives skin excellent affinity and crystal-clear effect, giving cosmetics features such as soft touch, soft luster, good affinity, and strong skin adhesion. It is the preferred high-end powdery raw material in the cosmetics industry.

In addition, the crystal transparency of mica powder allows makeup colors to maintain consistent intensity and is also suitable for various shades of colors. The unique nature of sericite can also add silky soft luster to cosmetic manufacturing. Products are widely used in powder, powder, eye shadow, liquid foundation, blush, powder and many other fields.

Plastics Field

Plastic mica powder has the characteristics of high diameter-to-thickness ratio, high temperature resistance, acid and alkali resistance, and wear resistance. It is a natural functional powder filling material. The company selects high-quality mica ore and uses a unique wet grinding and flaking and purification process. The mica flakes are completely cleaved and the unique high diameter-thickness ratio structure of mica is preserved (the diameter-thickness ratio is as high as 100 or more), making it an excellent choice for plastic products. It has outstanding reinforcing effect and gives plastic products excellent dimensional stability; the high temperature resistance of the product itself also greatly improves the Vicat softening point of plastics, which is suitable for parts and products under high temperature conditions; mica and glass fiber Compared with other products, it has the characteristics of smooth surface and no warping and deformation. Products are widely used in fields such as PP, PA, PBT, PET and other plastic modification, functional masterbatch and plastic engineering applications.

The coating is easy to age, is not heat-resistant, and has poor impact resistance, which limits the application fields of plastics. Mica powder, with its unique and excellent properties, is filled into plastic to reduce the shrinkage, warpage and curvature of the product; improve the mechanical properties, heat resistance, insulation and chemical stability of the product; increase the surface gloss of the product; While preventing the aging of plastics, it also expands the application fields of plastics and increases the added value of mica mineral powder. Utilizing the basic characteristics of flaky mica, it is subjected to supersonic airflow pulverization and surface chemical modification to change the properties of mica scales and prepare a polyethylene reinforcing agent.

Research results show that active flake mica improves the mechanical properties of polyethylene and has a reinforcing effect. The study found. There is an obvious synergistic enhancement effect between modified mica and PP, which can effectively improve the tensile strength, impact strength, flexural strength, modulus, hardness and heat deformation temperature of PP. Research has found that mica powder is used as a new reinforcing filler in polyvinyl chloride, which is beneficial to plastic processing companies in reducing production costs and improving product quality.

Research has found that modified mica in the modification of nylon 6 can not only enhance the rigidity and heat resistance of nylon 6, reduce molding shrinkage, but also significantly reduce the production cost of reinforced nylon 6, which is conducive to enhancing market competitiveness. , which is conducive to the expansion of market application fields. Modified nylon 610 materials were prepared using cross-linking agent, mica powder and nylon 610 multi-component composite blending modification technology. The results show that moderate cross-linking and adding mica powder can improve the mechanical properties and electrical strength of nylon 610 resin. Cross-linking agent The appropriate content of nylon and mica powder in modified nylon 610 is 5% and 10% respectively. The surface of muscovite mica is modified with a silane coupling agent, and then combined with acrylonitrile-butadiene-styrene copolymer (ABS) to prepare a composite material. The results show that muscovite is distributed in ABS in a lamellar structure, which can effectively improve the stiffness of ABS and greatly reduce costs while maintaining good comprehensive mechanical properties.

Lingshou County mica was used to treat Lingshou County mica-filled modified polyaryl ether ketone using phthalyl. The study found that the modified mica could significantly improve the tensile strength, tensile elastic modulus and elongation at break of polyaryl ether ketone. Studies have found that when mica is used to fill polymer materials such as polyolefin, polyester, polyamide, and polyurethane, the tensile strength, tear strength, and Shore hardness of the prepared composite materials are improved to varying degrees. Composite materials made by mixing mica with thermoplastic resin or thermosetting resin are engineering plastics with a wide range of uses.

Electronic Field

Mica powder is a new type of special functional filler that meets the technical requirements of the copper-clad laminate industry. It can replace electronic-grade silica powder and give the board ideal insulation, rigidity, low expansion rate, drilling processability, heat resistance and process stability. performance. The material is completely chemically inert and will not crack, deteriorate or induce reactions even at high temperatures and in complex systems. In particular, it has the characteristics of greatly improving drilling efficiency, drilling quality and reducing drill bit wear. It is gradually becoming a popular material in the copper clad laminate industry.

Rubber Field

Mica powder is an excellent rubber filling reinforcing material. The unique structure with high diameter-to-thickness ratio excellently improves the reinforcing effect. The excellent flaky crystal shape greatly improves the air tightness. The polarizing effect of its own mineral crystals and the interference of interlayer water molecules Effect, effectively shielding ultraviolet, microwave, and infrared rays, greatly improving the aging resistance of products.

The application results of Beijing Rubber Research Institute, Henan Tire Factory, Sichuan Rubber Factory and other manufacturers in tires, tapes, rubber sheets, hoses, automotive rubber accessories and other products have proven that sericite powder has good processing properties and can replace 30-50% Semi-reinforced or other coarse-grained carbon black, or adding a certain proportion of sericite powder to the original formula can maintain the performance of the rubber compound while reducing the cost of the product.

Refractory Field

In the field of refractory materials, mica powder has the advantages of stable main mineral content, moderate refractoriness, stable physical and chemical properties of insulation, good mud bonding, no expansion, fast drying speed, good plasticity, and strong resistance to iron flow erosion.

Electrode Field

In the field of welding materials, mica powder is a new type of electrode coating material. Its unique combination of chemical elements can improve arc stability, reduce spatter, improve the process performance of the electrode, and solve the problem of cracking of the electrode coating that often occurs during the production process of the electrode. Question, when used in acidic welding rods such as E4303 and E4313, the recommended ratio is 3%-5%. At the same time, it has a certain degree of elasticity and plasticity, which can increase the slipperiness of the welding rod coating and the fluidity in the powder tank, and improve its Pressure coating performance, replacing titanium dioxide, reducing the cost of welding rods.

Ceramic Industry

Mica ceramic is a special engineering material suitable for the production of heat-resistant materials, insulation materials, high-temperature mechanical components, etc., and is widely used in the electrical and electronic industries. Mica ceramics are generally made by crystallized glass method or sintering method. However, the flexural strength of mica ceramics produced by these two processes is not ideal enough. For example, the flexural strength of mica ceramics produced by the glass crystallization method is generally only in the range of 100-140MPa, and the flexural strength of mica ceramics produced by the sintering method is in the range of 120-130MPa. In order to significantly improve the strength properties of mica ceramics, a foreign company developed an ingredient for the production of high-strength mica ceramics through intensive research and development.

According to reports, the ingredient is made of phlogopite and alumina as the main raw materials, and is mixed with barium fluoride and calcium fluoride admixtures. Using this ingredient can effectively improve the strength properties, making the flexural strength of mica ceramics exceed 160MPa. In order to evaluate the performance of high-strength mica ceramics, the company conducted the following tests. Ingredients according to the proportion given in Table 1, add appropriate amount of water, mix and grind in a ball mill for 24 hours, prepare the mixture, press it under a pressure of 75MPa to form a round test body, then fill in fluor phlogopite powder, and grind at 1280℃ and 1340℃ respectively. Sinter at 1300°C for 1 hour, cool, and measure the flexural strength, machinability, thermal expansion coefficient, and electrical properties of the sintered specimen. The measurement results show that the mica ceramic not only maintains its inherent characteristics, but also has good processability. More importantly, the flexural strength is significantly improved. Therefore, it performs better in use.

Paint Feed

Pearlescent paint uses mica as an additive, which can enhance the transparency and gloss of the paint and reduce costs.

Building Materials

Mica powder is more widely used in building materials, such as roofing materials, where it plays the role of waterproofing, fireproofing, heat preservation, heat insulation and decoration. Used in linoleum, pipes, mortars and cements to improve performance, etc.

Mica Powder Processing

According to the processing technology, mica powder can be divided into two types: dry processing and wet processing.

At present, the existing dry and wet sericite powder production equipment in my country are replaced by other mineral production machinery. In fact, the simple production process is complicated, so the production cost is very high.

1. Raymond Grinding Process

Ore dressing - Rough Crushing - Processing - Grinding - Grading - Packaging - Finished Products.

The mica powder content of this product can reach more than 70%, and it is suitable for use in medium and low-end paints, exterior wall paints, anti-corrosion and pyrotechnic paints, ship paints, rubber, welding rods, cables and other industries, with very good results.

2. Adopt New Technology—Air Flow Purification and Classification Processing

Ore Dressing - Rough Crushing - Processing of Semi-finished Products - Purification - Grinding - Grading - Packaging - Finished Products.

This process separates mica and quartz, making the mica powder highly purified, and the mica content can reach more than 95%. The technical indicators of this product can reach the wet process mica powder standard. This advanced equipment, under automated control, produces mica powder in a standardized manner, preserving the original unique scaly structure of mica ore, with a high diameter-to-thickness ratio and excellent quality. Mica powder is suitable for use in medium and high-end exterior wall coatings, powder coatings, anti-corrosion and fire-fighting coatings, ship coatings, multi-functional paints and coatings, with good results.

How to distinguish true and false mica powder with simple method?

1. Mica powder whiteness is not high, about 75; If doped with other fillers such as calcium carbonate, talc powder, etc., the whiteness will be greatly improved. This can prove the mica powder is real.
2. Mica powder is flake structure, take a beaker, add 100ml pure water, stir with a glass rod, it can be seen that mica powder suspension is very good; If the filling material has transparent powder, talc powder, calcium carbonate and other products, the suspension is not excellent than mica powder, it can prove that mica powder is false.
3. Take a small amount of mica powder and apply it to your hands, there is a little pearlescent effect; If the purchased mica powder has poor pearlescent effect or no pearlescent effect, it should be noted at this time. This can also distinguish the mica powder real and fake.