Nano cesium tungstate may be applied for preparing heat insulation coating. With the gradual expansion of this new type of transparent coating material in the field of heat insulation, the preparation of cesium tungstate is becoming more and more important. While some experts have found that the nano grain size cesium tungstate prepared by the prior method has the problems of poor dispersibility, poor heat insulation property and low visible light transmittance.
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In this regard, experts have proposed a preparation method of nano cesium tungstate powder, which can solve the above problems, the specific steps are as follows:
1.0 According to n(CS)/n(W)=0.33:1, ammonium paratungstate and cesium nitrate are dissolved in citric acid solution and n-propanol, stirred uniformly, and reacted at 180-200°C for 2-3 hours to obtain the mixture of tungsten and cesium;
2.0 Add appropriate amount of urea to the mixture of tungsten and cesium, adjust the pH of the reaction solution to 3-5, stir until the urea is completely dissolved;
3.0 Wash the mixture completely dissolved in step 2.0 with argon gas, and carry out chemical reaction under ultrasonic protection (ultrasonic radiation frequency of 30.10 kHz) at 70-90°C under argon for 2-6h to obtain colloidal precipitate;
4.0 The colloidal precipitate was aged for 4-24 hours, then filtered, washed, dried, and finally calcined to obtain nano cesium tungstate powder. Among them, the drying method is air drying, vacuum drying, freeze drying or microwave drying.
