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Yuan Lei knowledge | What is wollastonite powder

Release time:

2024-04-10 14:43

Wollastonite powder is a chemical with the formula Ca3(Si3O9). Let's take a look at what wollastonite powder is.

㈠ intro

Appearance: wollite powder is white microstrip gray, red, flaky, radial or fibrous aggregate, triclinic crystal system, glass luster, cleavage mask pearl luster.

The chemical formula of wollastonite is CaSiO3, and the theoretical chemical composition is CaO48.25% and SiO251.75%. Pure wollite is rare in nature. During its formation, Ca is sometimes partially replaced by Fe, Mn, Ti, Sr plasma to form an isomorphic body, mixed with a small amount of Al and trace amounts of K and Na.

 

 

㈡ use

Wollastonite powder is widely used in ceramics, paints, coatings, plastics, rubber, chemical industry, paper making, welding rod and so on.

In the plastics industry, wollastonite powder not only plays a filling role, but also can partially replace asbestos and glass fiber for reinforcing materials. At present, it has been used in epoxy, phenolic, thermosetting polyester, polyolefin and other plastics. Wollastonite powder is widely used in plastics for deep processing products. As a plastic filler, it is mainly used to improve tensile strength and flexural strength and reduce costs.

In the rubber industry, natural wollastonite powder has a special needle-like structure, white, non-toxic, after ultrafine grinding, surface modification is the ideal filler for rubber, not only can reduce the production cost of rubber products, but also can improve the mechanical properties of rubber, give rubber itself does not have special functions.

In the coating industry, wollastonite powder as a filler for paints and coatings can improve the physical and chemical properties of the product, persistent weather resistance, reduce the gloss of the paint, enhance the expansion ability of the paint, reduce cracks, but also reduce the amount of oil absorption and enhance the corrosion resistance. Wollastonite has bright color and high reflectivity, which is suitable for the production of high-quality white paint and clear and transparent colored paint. Acicular wollastonite powder has good flatness, high color coverage and uniform distribution, and has the characteristics of anti-ultraviolet. It is widely used in interior wall paint, exterior wall paint, special paint and latex paint. Ultrafine particle size, the higher the whiteness and PH value, the better the color and coating property of the paint, and the alkaline paint can be used as an anti-corrosion coating for steel and other metal equipment.

In the paper industry, wollastonite powder can be used as filler and plant fiber composite into paper composite fiber to replace some plant fiber. Reduce the amount of wood pulp, reduce the cost, improve the performance of paper products, improve the smoothness and opacity of paper products, improve the evenness of paper products, eliminate the static electricity of paper products, the shrinkage rate of paper products is less, the printability is good, and can reduce the pollution emissions in the pulping process of plant fiber.

 

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