Nano particle size violet tungsten oxide may be applied for the preparation of near infrared shielding material. And the shielding material is widely used in the fields of military and heat insulation. Therefore, the preparation of violet tungsten oxide is very important. And thus, the following mainly introduces a new preparation method of ultrafine violet tungsten oxide. This producing method has the characteristics of short process and low cost. And the prepared violet tungsten oxide powder has high purity, large specific surface area, good dispersibility and good performance.
A new preparation process of ultrafine violet tungsten oxide, the steps are as follows:
Step One: Preparation of raw materials - ammonium metatungstate, ammonium nitrate and adjuvant.
Step Two: Prepare the solution. The above raw materials are prepared into solutions according to a certain ratio, and uniformly mixed. The molar ratio of ammonium nitrate to ammonium metatungstate is 12~36; The molar ratio of adjuvant to ammonium metatungstate is 5~15.
Step Three: Heat the obtained solution, evaporating and concentrating to form gelatinous substance, and then undergoing decomposition reaction. In this process, there is a large amount of gas generated. Finally, nano grain size needle-shaped violet tungsten oxide powder is obtained by redox reaction.
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