Ammonium metatungstate powder can be used to prepare cesium tungsten bronze nano powder, and thus be used to prepare transparent thermal insulation dispersion. Finally, a new near-infrared shielding material such as a transparent architectural glass heat insulation film will be obtained. Specifically, the producing processes are as follows:

Ammonium metatungstate powder can be used for preparing cesium tungsten bronze nanoparticles, and the obtained nano powder can be used for producing a transparent thermal insulation paper, that is, a heat insulating film, for architectural glass, due to its excellent optical properties. Experts said that to obtain a heat-insulating film, it is necessary to prepare a transparent heat-insulating raw material - cesium tungsten bronze powder. So, they proposed a preparation process of cesium tungsten bronze powder with a particle size of less than 100nm.

Ammonium metatungstate powder can be used as a raw material for preparing an alkali metal cation-co-doped tungsten oxide material, namely cesium tungsten bronze nanoparticles. And the obtained functional particles can be used for producing a transparent heat insulating material - building glass thermal insulation film.

Some experts use ammonium metatungstate powder and cesium carbonate as the main raw materials to produce heat insulation materials with a molar ratio of Cs:W:Cl=0.33:1:0.30, and use this material to prepare thermal insulation dispersion liquid. Finally, they adopt the dispersion liquid to manufacture transparent heat insulation film, the specific steps are as follows: