Ammonium metatungstate nanoparticles can be used together with ammonium chloride to prepare a thermal insulation powder with a molar ratio of Rb:W:Cl=0.33:1:0.05, and the powder is prepared into transparent building glass thermal insulation paper, i.e., a transparent insulation film. Specifically, the experts propose the following experimental steps:
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10g of ammonium metatungstate was formulated into a 30wt% aqueous solution and stirred uniformly to obtain a transparent liquid A. 0.11g of ammonium chloride was added into the transparent liquid A, and the mixture was uniformly stirred to obtain a transparent liquid A'. 1.5g of cesium carbonate was added to formulate a 50wt% aqueous solution, and the mixture was uniformly stirred 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 liquid C was heated at 145°C to obtain a powdery product. The powder product was heated at 550°C for 20 minutes under a 10vol% hydrogen reduction environment. A powder product D with a molar ratio Rb:W:Cl=0.33:1:0.05 was obtained. The powder product D was added to a toluene solvent to prepare a 10wt% solution, and a 40wt% polymer dispersant was added, and the nano dispersion E was obtained by grinding and dispersing with 2mm yttrium zirconium beads. This dispersion E and acrylic resin were formulated into a 30wt% coating F. This coating F was applied onto the glass by wet coating, and dried at 80°C for half an hour to obtain a transparent heat-insulating film.
