Position:Home > Wollastonite belongs to a chain metasilicate, and is also a fibrous and needle-like silicate. Because wollastonite is non-toxic, has low oil absorption, low water absorption, thermal and chemical stability, high whiteness, and has unique powder fibers and other properties, it is widely used in architectural ceramics, coatings, plastics, rubber, metallurgy, etc. and refractory industries. At present, the annual consumption of wollastonite in the world is about 600,000 tons, ceramics account for about 40% to 50%, plastics 20% to 25%, asbestos substitutes 20% to 25%, metallurgy accounts for 10%, and pigments and others account for 5%. %.
High aspect ratio wollastonite (15:1 ~ 20:1) is mainly used as a reinforcing functional filler in coatings, plastics and rubber to improve hardness, bending strength and impact resistance, and can also improve the electrical properties of plastics. Thermal stability, enhanced corrosion resistance and improved wear resistance; can also replace asbestos in the manufacture of friction materials, insulating materials and flame retardants. Ground-grade wollastonite (low aspect ratio wollastonite 3:1 to 5:1) is mainly used as raw materials for CaO and SiO2 in ceramic and glass manufacturing processes and as low-temperature flux in metallurgical industry.
1. Wollastonite is a very promising energy-saving ceramic raw material. Wollastonite as a ceramic raw material can increase the strength of the ceramic body and ceramic products, reduce the cracking of ceramics and glaze spots, increase the gloss of the glaze surface, and reduce fuel consumption. The demand for wollastonite in the ceramic industry will increase year by year at a rate of about 5%. Acicular wollastonite powder is used in special ceramics.
2. Because wollastonite is non-toxic and harmless, and has thermal stability and various enhancement properties, it naturally becomes the best substitute for asbestos. Every year, 35,000 to 40,000 tons of wollastonite with high aspect ratio are consumed in industries such as building materials and insulators. It is mainly used in firewall boards, cement materials and friction materials. Acicular wollastonite with high friction levels is mainly used in brake pads, valve plugs, and automotive clutches.
3. High-purity wollastonite powder, as an inorganic white extender pigment, is widely used in coatings and replaces expensive titanium dioxide. Replacing 30% of titanium dioxide with 320 mesh wollastonite powder can reduce the cost of latex paint in the range of 130-200 yuan/ton. Wollastonite has high hardness, Mohs hardness of 4.5 to 5, and low thermal expansion coefficient. It is an inert filler. It not only has good weather resistance, but its needle-like structure also has crack resistance, high whiteness and good tinting strength. As an important filler, it is becoming more and more important. Mostly used in exterior wall coatings.
4. Adding wollastonite powder to plastics can not only improve the tensile strength and flexural strength of plastic products, reduce the amount of resin, but also improve the thermal stability and shape stability of plastics at high temperature. The surface treatment of acicular wollastonite powder can improve the adsorption strength of wollastonite and organic polymers, and improve the properties of molded products. It is widely used in automotive plastics, PP, PV, PVC and other plastic products. At present, the most promising field of wollastonite consumption in the world is the engineering plastics industry. wollastonite is mainly used in nylon 6, nylon 66, polytetrafluoroethylene, polypropylene (PP), polyethylene, polystyrene and polyolefin Masterbatch, etc. Like nylon 6 and nylon 66, most are filled up to 40%.
5. Wollastonite has a special needle-like structure, white and non-toxic. It is an ideal filler for rubber after ultra-fine grinding and surface modification. It can not only reduce the production cost of rubber products, but also improve the mechanical properties of rubber. Special features that rubber itself does not have.
Wollastonite is used in light-colored rubber, and can replace titanium dioxide, clay and lithopone in a large amount, play a certain reinforcing role, and can improve the covering ability of white colorants, and play a whitening role.
To sum up, when wollastonite is used as a functional filler in the ceramic industry, plastics, rubber, paints, coatings, etc., it can effectively enhance the toughness, stability, strength, etc. of products, and can also reduce energy consumption. Isn't the filling and modification effect of wollastonite amazing?
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