Ammonium Metatungstate Powder Applied for Thermal Insulating Glass

Ammonium metatungstate powder may be applied in thermal insulating glass. According to experts, ammonium metatungstate can be used as a raw material to prepare heat-insulating material with a molar ratio of Cs:W:Cl=0.33:1:0.50, and a transparent heat-insulating film may be prepared using the obtained material. Finally, the prepared thin film is applied to architectural glass. Specifically, the processes of preparing the heat-insulating powder and the transparent heat insulating film are as follows:

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Step one: 10g of ammonium metatungstate was prepared into a 30wt% aqueous solution and stirred uniformly to obtain a transparent liquid A. 1.1g ammonium chloride was taken, transparent liquid A was added, and the mixture was uniformly stirred to obtain a transparent liquid A'. 2.2 g 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.

Step two: The mixed liquid C was heated at 145°C to obtain a powdery product. The powder product was heated at 550°C for 20min under a reduced atmosphere of 10vol% of hydrogen to obtain a powder P product of heat insulating material with a molar ratio of Cs:W:Cl=0.33:1:0.50.

Step three: add the heat insulating powder product P to the toluene solvent to prepare a 1% solution, adding 40% polymer dispersant, and grinding and dispersing with 2mm yttrium zirconium beads to obtain nano dispersion D.

Step four: the dispersion D and the acrylic resin were formulated into a 30wt% coating E.

Step five: This coating E was applied onto the glass by wet coating, and dried at 80°C for half an hour to obtain a transparent heat-insulating film.

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