Nano grain size cesium tungsten bronze may be used for the preparation of thermal insulation dispersion liquid, which has excellent heat insulating properties, dispersing properties and the like. And thus the dispersion liquid is widely used for the production of heat insulating window film, thermal insulation car film and thermal insulating agricultural film. Therefore, the preparation of its raw material, cesium tungsten bronze, is very important.
Some experts have discovered a preparation method of cesium tungsten bronze powder. The specific steps are as follows:
1.0 0.5 mol/L sodium tungstate solution was exchanged with a cationic resin to obtain tungstic acid sol.
2.0 Add citric acid solution and cesium carbonate solution to the tungstic acid sol, and then perform a mixture treatment to obtain hydrothermal reaction precursor liquid. In the hydrothermal reaction precursor liquid, the molar concentration ratio of tungstic acid, citric acid and strontium carbonate are ensured --- 1:0.1:0.1. And the concentration of citric acid in the hydrothermal reaction precursor was controlled at 0.2mol/L.
3.0 The hydrothermal reaction precursor liquid is placed in a high pressure reaction kettle for hydrothermal reaction. After the reaction is completed, ultrasonic water washing, alcohol washing, centrifugation, and spray drying are performed to finally obtain a cesium tungsten bronze. The hydrothermal reaction temperature was 160°C, the pressure was 0.8MPa, and the reaction time was 1 day.
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