Ammonium metatungstate nanoparticles, also known as AMT nano particles, can be used to prepare a transparent architectural glass thermal insulation film. Specifically, the expert proposed a method of preparing a heat insulating material with a molar ratio of Rb:W=0.33:1 using ammonium metatungstate and cesium carbonate as raw materials.
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10g of ammonium metatungstate was prepared into a 30wt% aqueous solution and stirred uniformly to obtain a transparent liquid A. 1.5g of cesium carbonate was prepared into 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 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 heat insulating powder product D with a molar ratio Rb: W = 0.33:1 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 was combined with an acrylic resin to form 30wt% coating F. The coating F was applied to the glass by a general wet coating method, and dried at 80°C for half an hour to obtain a transparent heat-insulating film.
