Ammonium Metatungstate Powder Applied for Near Infrared Shielding Material

Ammonium metatungstate powder is an indirect raw material for the production of near infrared shielding material. Specifically, ammonium metatungstate can be used first to prepare cesium tungsten bronze, and the obtained cesium tungsten bronze nanoparticles is used to produce heat shielding materials, that is, heat insulation materials for building glass.

As you may have known, cesium tungsten bronze has great influence on the performance of the subsequent heat insulation material. Therefore, it is necessary to carry out related research. The following is a preparation method of cesium tungsten bronze nano powder proposed by experts. The specific steps are as follows:

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Step one: Dissolve the reaction amount of ammonium metatungstate and cesium nitrate in a solvent. The solvent is deionized water. Dry the above solution to obtain a powder, and further pulverizing the powder to obtain a mixed powder of tungsten and cesium.

Step two: Place the mixed powder of tungsten and cesium in a closed reaction vessel with stirring, adding a reaction solvent thereto, and carried out stirring reaction at 180-350°C for 2-8 hours. The reaction solvent is sorbitol. And the quality of the reaction solvent is 1-3 times the mass of tungsten and cesium mixed powder.

Step three: Separate the reaction product in step two, washing with deionized water or ethanol, drying, and then pulverizing with a jet mill to obtain cesium tungsten bronze nanoparticles. Wherein, the air pressure of the air bag of air pulverizer is 0.6MPa-1.1MPa, and the speed of air pulverizer classifier is set to 1000rpm/5000rpm.

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