Nano Ammonium Metatungstate Applied for Window Heat Insulation Film

Nano ammonium metatungstate is a raw material in a new method for preparing nano tungsten oxide aqueous solution. And the obtained aqueous solution can be used for producing window heat insulation film for architectural glass, thereby achieving the purpose of energy conservation and consumption reduction. The following are the specific steps, advantages and disadvantages of the traditional and new methods for the preparation of nano tungsten oxide aqueous solutions.

Traditional preparation method of nano tungsten oxide aqueous solution: Take 40ml of deionized water as solvent, 5ml of acetic acid as initiator, 0.4g of SB12 as dispersant, 4g of sodium tungstate and 15ml of 5mol/L of nitric acid reacted at 80°C, and kept for 3h, to obtain a colorless nanoparticles solution with a lemon yellow precipitate on the bottom. The disadvantage of this method is that it requires the use of a suitable dispersant. And there are more impurities. Also, the complicated preparation process leading to a longer production cycle.

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http://www.ammonium-metatungstate.com/

New method for preparing nano tungsten oxide aqueous solution: Take 10ml of deionized water in a beaker, weigh 1g of ammonium metatungstate into deionized water, add 5g of sodium borohydride, mix and shake, heat to 95°C, and let stand to react for 10 minute, a tungsten oxide nano aqueous solution with a particle size of 10-50nm was obtained. The method has the advantages: no dispersing agent is needed, no impurities are involved, the preparation process is simple, and the preparation time is short, so it is suitable for large-scale production.

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