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.

The nano tungsten oxide aqueous solution can be prepared by using nano ammonium metatungstate as a raw material. And the obtained aqueous solution can be used for producing transparent heat insulating material such as heat insulation film, and thus be applied to architectural glass to obtain thermal insulating glass.

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.

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.