Tungsten trioxide nanopowder with alkali metal element doping is widely used in the preparation of nano heat insulating film due to its excellent visible light transmittance and near-infrared light absorption properties. Wherein, the obtained transparent heat-shielding film has a transmittance of ultraviolet light of less than 1%, a transmittance of near-infrared light of less than 15%, and a transmittance of visible light of more than 70%.
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According to the experts, the doped tungsten trioxide nano particles can be directly blended and cast with EVA to form a transparent nano heat insulating film that integrates the characteristics of safety, energy conservation and environmental protection. In addition, such a thermal insulation film can also be applied to energy-saving laminated glass. And the comprehensive performance of the obtained glass is better than that of sunlight-control coated glass on the market. In this process, the experts also studied the forming process of the transparent dingal film of the nano tungsten oxide particles. They evenly dispersed the tungsten trioxide nanopowder in the polymer to form a film, and solved the problem of compatibility between the nano particles and the high phonon barrier material.
