Ammonium metatungstate powder can be used to prepare violet tungsten oxide. And the obtained violet tungsten oxide can be used to prepare a new thermal insulation masterbatch, and thus be applied for the production of transparent building thermal insulation film, which has high light transmission, high heat insulation, high explosion-proof and high anti-UV performance.
According to experts, as tungsten oxide is a kind of nano inorganic heat insulating material, the obtained heat insulating film is not easy to fade. And it does not affect wireless communication. Also, its anti-UV rate is up to 99%. Therefore, the architectural glass to which the heat insulating film is applied can prevent the furniture from fading and protect human skin from tanning and even cancerating.
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The following is a preparation method of nano violet tungsten oxide proposed by experts: Weigh 0.01mol of ammonium metatungstate, 0.36mol of ammonium nitrate, 0.05mol of thiourea according to the reaction ratio. Dissolve the raw material powders in an appropriate amount of deionized water and stirred until they are completely dissolved. After that, it is heated at a constant temperature of 200°C. And after the solution is evaporated to dryness, a severe redox reaction occurs in a few tens of seconds to release a large amount of gas to form violet tungsten oxide. The obtained violet tungsten oxide powder was in the form of a nanoneedle with a particle size of 70-150nm and a length of 0.5-3μm.
