Summary:Talc can be widely used in PP, PE, PS, PA, ABS, PC, PVC and other products. According to different industrial uses, fine talc powder can be divided into 7 varieties.
Talc Grinding Powder
Talc is a hydrothermal alteration mineral. Magnesium-rich minerals often become talc through hydrothermal alteration, so talc is often called olivine, refractory pyroxene, horn amphibolite, tremolite and other mineral illusions. Talc is a common silicate mineral that is very soft and has a creamy feel. It is generally lumpy, leafy, fibrous or radial, white, off-white in color, and may be colored by other impurities. Hardness 1, specific gravity 2.7 ~ 2.8 talc has excellent physical and chemical properties such as lubricity, anti-sticky, flow aid, fire resistance, acid resistance, insulation, high melting point, chemical inactivity, good hiding power, softness, good gloss, strong adsorption and so on.
Talc Distribution In China
China's current annual output of talc is about 2.45 million tons. By region, Liaoning 80~90, Shandong 50~60, Guangxi 50~60, Jiangxi about 10, Sichuan about 10, other 30. The market demand is about 2.1 million tons, so overall, China's talc is still in a situation of oversupply. However, the production capacity of high-grade white talc raw materials in China is about 500,000 tons, which has reached its limit, and the possibility of further increasing production is unlikely. The demand for high-grade white talc in the domestic and foreign markets is at least 900,000 tons, so the supply of this part of talc will be short-term. Low-grade talc, especially black (gray) talc, is in oversupply, so its production is still likely to be further increased.
The future growth point of China's talc industry is in two aspects:
- (1) To improve the added value of high-grade raw materials;
- (2) Expand the export or deep processing of low-end products.
China is a source of white talc, but 80% of the products are exported abroad in the form of raw materials. The development of purification and deep processing and the development of high value-added products will be the key topics that need to be solved in the future of China's talc industry, and only in this way can China's talc production capacity be further expanded, and a large number of low-grade talc can find a new market.
Application Fields of Talc
Talc is divided into two types: ground talc and micro talc according to the size of its crushing particle size. According to different industrial uses, fine talc powder can be divided into 7 varieties:
Plastic Grade Talc: for polypropylene, nylon, polyvinyl chloride, polyethylene, Filler rubber grade talc powder for plastics such as polystyrene and polyurethane used in rubber fillers and rubber products anti-adhesive.
Talc can be widely used in PP, PE, PS, PA, ABS, PC, PVC and other products. Talcum powder filled plastic can improve the rigidity, dimensional stability, and lubricity of the product, prevent high-temperature creep, reduce the wear on the molding machine, and enable the polymer to increase the hardness and creep resistance through the filling, and the impact strength Basically unchanged.
Paint Grade Talc: for white body pigments and various types of water-based, oil-based, resin industrial coatings, primers, protective paints and other.
Talc has good suspension and dispersibility, and low abrasiveness. As a filler for coatings, talc with flaky particle structure can make the coating film have high water resistance and impermeability of enamel paint. It is mainly used in primers. Lacquer and intermediate coating; talcum powder with fibrous particle structure, because of its high oil absorption and good rheology, the storage stability of the coating is improved. And the rheology and leveling of the coating can be well improved. At the same time, the weather resistance of the coating can be improved.
Papermaking Grade Talc Powder: for all kinds of paper and cardboard fillers, wood asphalt control agent.
Talc has unique properties such as layered structure, softness, and hydrophobicity, and has significant advantages when applied to the paper industry:
- Helps increase filler retention and improve paper opacity, smoothness and printability, giving paper higher ink absorption;
- The surface is hydrophobic, and organic matter is easily adsorbed on the talc layered surface, which reduces the consumption of dyes and effectively saves costs. In addition, its lipophilicity makes it useful as a resin, adhesive inhibitor and waste paper deinking agent;
- It can be combined with sizing agent well to improve sizing agent retention, and can reduce the absorption of the paper, and prevent the printing ink from penetrating the paper;
- Talc powder has a low friction factor, which can make the surface of the coating smooth and soft, which can reduce the breakage of the coating and reduce the printing pressure;
- Talc has special lubricity. The coated paper made from it can obtain high finishing degree on the calender, and can reduce the amount of lubricant in the coating.
Cable Grade Talc: used for cable rubber reinforcers, cable isolators.
Ceramic Grade Talc: manufacturing electric porcelain, radio porcelain, various industrial ceramics, architectural ceramics, daily ceramics and porcelain glaze, etc .
Waterproof Material Grade Talc: used in waterproof membranes, waterproof coatings, waterproof ointment.
Other Fine Talc: high-grade paint coatings, plastics, cable rubber, cosmetics, copper plate paper coatings, textile lubricants, etc.Only by selecting appropriate processing equipment and strictly controlling the production process of each link can produce high-quality talcum powder with good whiteness and fineness.
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