Nano ammonium metatungstate can be used to produce nano tungsten oxide aqueous solution, and thus be used to produce heat insulation coating for transparent building glass. According to experts, the obtained coating has high heat insulation and high visible light transmittance with high UV shielding performance.
The following is a method for preparing nano tungsten oxide aqueous solution by using ammonium metatungstate as a raw material. The method is simple in operation. It does not require a dispersing agent and does not need to adjust the pH value with a short preparation time. Also, the obtained product is substantially free of impurities. Besides, it is very suitable for mass production.
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A method for preparing nano tungsten oxide aqueous solution: take 10 ml of deionized water in a beaker, weigh 20g of ammonium metatungstate into the deionized water, adding 5g of sodium borohydride, mixing and shaking, heating to 60°C, and reacting for 20 minutes until no more gas is produced, and a tungsten oxide nano aqueous solution with a particle size of 5-50nm was obtained.
