Nano ammonium metatungstate has strong short-wave near-infrared absorption properties so that it can be used to prepare cesium tungsten bronze nanoparticles, and the obtained nano dingal particles can be used to prepare a transparent thermal insulation paper for building glass. Experts said the obtained thin "paper" is actually a layer of thermal insulation film that inherits the characteristics of ammonium metatungstate. In other words, such film has an infrared shielding property that changes with changes in light intensity.
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Therefore, application of a lower concentration of cesium tungsten bronze to the PET film does not affect the transparency of the PET film. And the glass containing the cesium tungsten bronze dingal particles can maintain good transparency and can effectively block ultraviolet rays and near infrared rays. Some experts pointed out that a high-efficiency UV-blocking and near-infrared PET film and its preparation method include the following components: PET ultraviolet and near-infrared blocking masterbatch 20-40 parts by weight, PET resin 57-80 parts by weight, light stabilizer 0.1-3 parts by weight. Among them, the PET blocking masterbatch contains cesium tungsten bronze nanoparticles, tin oxide antimony nanoparticles and an ultraviolet absorber.
