Do you know all uses of wollastonite?-2 BY:Danny

Wollastonite products can be divided into two categories: high aspect ratio wollastonite and finely ground wollastonite. The former mainly utilizes its needle like physical and mechanical properties and is widely used in fields such as plastics, rubber, asbestos substitutes, paint coatings, etc. It can increase the hardness, bending strength, impact resistance of products, improve the electrical properties of materials, enhance thermal stability and dimensional stability, and is the most promising application field. The latter is mainly used in the ceramic and metallurgical industries, such as Si0 in wollastonite The Ca0 component provides low expansion rate and good thermal shock resistance.

Introduction to various applications of wollastonite:

3. Replacing fiberglass as a reinforcing filler for plastics

Wollastonite is the most promising, value-added, and rapidly growing application field for fillers. At present, this field accounts for about 25% of the world's total consumption of wollastonite. Wollastonite can replace or partially replace fiberglass as a reinforcing material for polymer composites, improving material properties, reducing costs, and playing a dual role of increment and reinforcement. At present, the focus of research on the application of wollastonite is on the use of wollastonite filled composite materials in electronic components, packaging materials, high-performance rubber products, automotive shells, molds, and optical disc materials. The filling amount of silica fume reinforced nylon modified with silane coupling agent can reach 50%, the impact strength is increased by more than 20 times, and it has extremely low moisture absorption rate; Ultra fine modified high aspect ratio wollastonite and carbon fiber filled polytetrafluoroethylene resin can be used to make durable and leak proof automatic sealing rings, which are applied in pressure reducing valves, butterfly valves, and compressor shafts.

4. As a substitute for asbestos

Wollastonite has needle like characteristics, low thermal expansion, and excellent thermal shock resistance, making it an ideal substitute material for short fiber asbestos. Wollastonite used as a substitute for asbestos accounts for 20% to 25% of the world's total consumption of wollastonite. The friction materials prepared by replacing asbestos with high friction coefficient wollastonite are mainly used in fields such as brake pads, valve plugs, and automotive clutches. Some studies have shown that the comprehensive performance of brake pads partially replaced by asbestos with needle shaped powder of wollastonite is good. Its friction coefficient is relatively stable below 300 ℃, with no obvious thermal degradation, good recovery, low friction loss rate, and the impact strength of the product is slightly reduced but higher than the national standard.

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