Ammonium Metatungstate Applied for Near Infrared Shielding Material

Ammonium metatungstate is one of the main raw materials for producing near infrared shielding material such as transparent heat-insulation films. Recently, some experts have proposed a new method for preparing cesium tungsten bronze heat-insulating film using ammonium metatungstate as raw material by a new method.

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A New Method for Preparing Thermal Insulation Film

Step one: Weigh 10g of ammonium metatungstate and prepared into a 30wt% aqueous solution, stirred uniformly to obtain a transparent liquid A.

Step two: Weigh 2.2g of cesium carbonate to prepare a 50wt% aqueous solution, stirring 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 three: The mixed liquid C was heated at 145°C to obtain a powder product. The powder was heated at 550°C for 20min in a 10vol% hydrogen reduction atmosphere to obtain a thermal insulation material powder product P with a molar ratio of Cs: W = 0.33:1.

Step four: Add the powder product P to the toluene solvent to prepare a 10wt% solution, and adding 40 wt% of the polymer type dispersant to the powder, grinding and dispersing with 2mm yttrium zirconium beads to obtain nano dispersion D.

Step five: The dispersion liquid D and the acrylic resin are formulated into 30wt% coating E, and the coating E is applied to the glass by wet coating, and dried at 80°C for half an hour to obtain a transparent thermal insulation film. The obtained heat insulating film is a cesium tungsten bronze heat insulating film.

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