Nano Cesium Tungstate Applied for Thermal Insulation Masterbatch

Nano cesium tungstate may be applied for preparing thermal insulation masterbatch, and therefore be used in the field of architectural and automotive glass. At present, this new type of masterbatch is applied more and more widely. However, the cesium tungstate nanopowder prepared by the current preparation method has problems such as poor dispersibility. It needs to be improved. 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:

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1.0 According to n(CS)/n(W)=0.33:1, ammonium metatungstate and cesium hydroxide are dissolved in citric acid solution and isopropanol, stirred uniformly, and reacted at 180-200°C for 3 hours to obtain a 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 dissolved in step 2.0 with argon gas, and subjected to ultrasonic irradiation (ultrasonic radiation frequency of 40.34 kHz) at 70-90°C under argon atmosphere for 2-6 hours to obtain gelatinous precipitate;

4.0 The gelatinous precipitate is aged for 4-24 hours, filtered, washed, vacuum dried, and finally calcined. The calcination temperature is 600-700°C, calcination time is 3-5 hours, and finally nanometer cesium tungstate powder is obtained.

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