Nano ammonium metatungstate can be used as a raw material for preparing a heat insulating material with a molar ratio of Cs:W:Cl=0.33:1:0.05, and a new environmentally-friendly thermal insulation film is prepared by using the thermal insulating material as raw material. Specifically, the preparation processes are as follows :
Step one: Preparation of heat insulation material powder. 10g of ammonium metatungstate was prepared into a 30wt% aqueous solution and stirred uniformly to obtain a transparent liquid A. 0.1g of ammonium chloride was added into the transparent liquid A. And the mixture was uniformly stirred to obtain a transparent liquid A'. 2.2g of cesium carbonate was prepared into a 50wt% aqueous solution and stirred uniformly to obtain a transparent liquid B. Further, the liquid B was gradually dropped into the liquid A' while maintaining the stirring of the liquid A' to obtain a transparent mixed liquid C. The mixed liquid C was heated at 145°C to obtain a powder product. And the powder product was heated at 550°C for 20 minutes under a reduced atmosphere of 10vol% of hydrogen to obtain a powder product P of heat insulating material with a molar ratio of Cs:W:Cl=0.33:1:0.05.
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Step two: Preparation of a transparent heat insulating film by using the heat insulating powder obtained in step one as raw material. The heat insulating powder product P was added to a toluene solvent to prepare a 10% solution, and a 40wt% polymer type dispersant was added, and the nanodispersed liquid D was obtained by grinding and dispersing with 2mm yttrium zirconium beads. This dispersion liquid D was made into a 30% coating E with an acrylic resin. This coating E was applied onto the glass by a wet coating method, and dried at 80°C for half an hour to obtain a transparent heat-insulating film.
