Nanometer blue tungsten oxide may be applied for manufacturing near-infrared shielding material, which may be used to prepare heat insulation films and other thermal insulation materials for building and automotive. Such blue tungsten oxide nano powder can be prepared by a self-reduction process of ammonium paratungstate (APT).
What are the advantages of using APT self-reduction process to prepare blue tungsten oxide powder? The traditional process technology inlets ammonia (NH3) or hydrogen (H2). From the production process point of view, the ammonium paratungstate itself in the micro-reduction process decomposed to generate NH3, which is cracked to generate a part of H2. While if the traditional process technology is adopted --- NH3 and H2 should be introduced in the process, it will increase the production process. As you may have known, NH3 is a relatively large environmental pollution factor. And it is also very harmful to human health. Therefore, from the perspective of environmental protection and safety, traditional process technology of inletting NH3 or H2 is more detrimental to safety and environmental protection than APT self-reduction process technology. And therefore, APT self-reduction process is used to prepare blue tungsten oxide powder.
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