Cesium tungstate powder, mainly nano cesium tungstate powder, may be applied for preparing thermal insulation masterbatch. As this kind of masterbatch is more and more widely used in the field of heat insulation, the preparation of nano particle size cesium tungstate is also more and more important. Experts say that the following preparation method can obtain the desired nano cesium tungstate.
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Preparation Method of Cesium Tungstate
Step one: Weigh 1.76g of ammonium paratungstate and 1.30g of cesium nitrate, add citric acid solution and n-propanol reagent at a concentration of 1mol/L, stir evenly, and react at 190°C for 2.5h to obtain a mixture of tungsten and cesium;
Step two: Add 2.4g of urea to the mixture of tungsten and cesium, adjust the pH of the reaction solution to 5, stir until the urea is completely dissolved to form a transparent solution;
Step three: After stirring the above solution, it was uniformly washed with argon for 30min, then inserted into an ultrasonic probe under the protection of argon gas at 90°C, and irradiated with ultrasonic wave at a frequency of 30.10 kHz for 6h to obtain gelatinous precipitate;
Step four: The gelatinous precipitate was aged for 24 hours, filtered under reduced pressure, and washed twice with distilled water, and then washed with a 10% by volume ethanol solution until the filtrate was neutral, and finally washed twice with absolute ethanol; The precursor was dried at 80°C for several hours, and then ground into powder. The powder was placed in a muffle furnace and kept at 650°C for 3 hours, and cooled with the furnace to obtain nano cesium tungstate powder.
