Nano ammonium metatungstate can be used to prepare nano tungsten oxide aqueous solution, which is a raw material that can be used to produce thermal insulation coating for applying in building glass. The obtained coating is a new type of transparent, environmentally friendly thermal insulation coating that does not interfere with the passage of visible light. Also, it can block a large amount of ultraviolet light and near-infrared rays that cause "heat". Some experts have proposed a preparation method of nano tungsten oxide aqueous solution with simple process and good stability to overcome the shortcomings in the prior production methods.
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A preparation method of nano tungsten oxide aqueous solution specifically includes the following steps:
Step one: Weigh ammonium metatungstate and sodium borohydride, according to the ratio of ammonium metatungstate and sodium borohydride mass ratio of 1-10:1, respectively;
Step two: Add the ammonium metatungstate powder to deionized water to obtain an ammonium metatungstate aqueous solution with a concentration of 5-50%;
Step three: Add the sodium borohydride solid to the ammonium metatungstate aqueous solution, mixing and shaking, and letting the reaction stand for 10-60min at room temperature to 95°C, and the solution is centrifuged. The supernatant was removed by filtration, and the obtained precipitate was washed, and deionized water was poured to obtain tungsten oxide nano aqueous solution with a particle size of 0.1-100nm.
