Cesium doped tungsten oxide nanopowder may be used to produce thermal insulation masterbatch. And the obtained masterbatch not only has excellent thermal insulation effect, but can be applied in the production of thermal insulation film and other heat-insulating materials. Moreover, the thermal insulation material prepared by cesium doped tungsten oxide nano particles is transparent, which will not affect the lighting needs. Therefore, the application of this material in the field of heat insulation is gradually broadened. And thus, experts have further studied the preparation method of nano Cs doped tungsten oxide powder, and they proposed a method, the specific steps are as follows:
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1.0 The raw material ammonium tungstate and cesium nitrate are respectively dissolved in absolute ethanol, and the tungsten salt solution is configured into tungstic acid solution through the exchange resin;
2.0 The tungstic acid solution, cesium salt solution and triethylene glycol are mixed and continuously stirred under a water bath condition of 55-80°C for 1-3h to obtain hydrothermal reaction precursor liquid; the mass of the reaction solvent is 1.5-3.0 times the mass of ammonium tungstate and cesium nitrate.
3.0 The precursor liquid is placed in a closed hydrothermal reaction kettle with a stirring device, and the reaction is performed at 180-300°C for 5-20h;
4.0 The hydrothermal reaction precipitate is repeatedly washed with deionized water, dried at 80-120°C for 8-12h, and pulverized by a jet mill. The air pressure in the crushing chamber is controlled at 0.5-1.0MPa, and the pulverization speed is controlled by setting it to 2000-5000r/min, and then calcining in a hydrogen atmosphere to obtain Cs doped tungsten oxide nano powder.
