Nano particle size violet tungsten oxide for thermal insulation dispersion liquid may be prepared by using ammonium metatungstate (AMT), ammonium nitrate and an auxiliary agent as raw materials. These raw materials are mixed into solutions by a certain ratio. And then the obtained solution is heated, evaporated, and performed redox reaction to obtain violet tungsten oxide. The obtained powder is nano needle-shaped violet tungsten oxide powder with large specific surface area, large surface activity and other excellent performance.
The preparation of nano needle-shaped violet tungsten oxide by this method has the following advantages:
1.0 With low cost, simple and fast process, it is suitable for large-scale production.
2.0 The reaction process of the precursor preparation can be controlled by controlling the type and ratio of the raw materials, and the morphology and crystal form of the powder can be controlled as well.
3.0 A large amount of gas is generated during the reaction, which hinders the sufficient contact of the reactants with oxygen. Therefore, it is favorable for the preparation of violet tungsten oxide.
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