Infrared light has an obvious thermal effect, which can easily lead to an increase in ambient temperature. Ordinary architectural glass has no thermal insulation effect, and can only be achieved by means of filming. Therefore, architectural glass, car film, outdoor facilities and other surfaces need to use thermal insulation materials to achieve the effect of thermal insulation and energy saving. In recent years, tungsten oxide has attracted widespread attention due to its excellent optoelectronic properties, and tungsten oxide powder doped with cesium element has strong absorption characteristics in the infrared region, and at the same time, the transmittance of visible light is high. An inorganic nano-powder with the best absorption ability for near-infrared, as a transparent thermal insulation material and green energy-saving and environmental protection material, it has a wide application prospect in automobiles and buildings such as infrared blocking and glass thermal insulation.

Nano cesium tungsten bronze not only has strong absorption characteristics in the near-infrared region (wavelength of 800-1100nm), but also has strong transmission characteristics in the visible light region (wavelength of 380-780nm), and in the ultraviolet region (wavelength of 200- 380nm) also has strong shielding properties.

Preparation of CsxWO3 Coated Glass
      After fully grinding and ultrasonically dispersing the CsxWO3 powder, it was added to a 0.1g/ml polyvinyl alcohol PVA solution, stirred in water at 80°C for 40 minutes, aged for 2 days, and then coated on ordinary glass (7cm*12cm) by roller coating method. *0.3cm) to be coated into a thin film to obtain CsxWO3 coated glass.

Thermal insulation performance test of CsxWO3 coated glass
      The thermal insulation box is made of foam board. The internal space of the thermal insulation box is 10cm*5cm*10.5cm, the top of the box is opened with a 10cm*5cm rectangular window, the bottom of the box is covered with a black iron plate, and the thermometer is close to the black iron surface of the board. Place the film-coated glass plate coated with CsxWO3 on the window of the heat-insulated air-tight space, let the film-coated part completely cover the window of the space, and irradiate it with a 250W infrared light at a vertical distance of 25cm from the window, and record the temperature in the box as the temperature changes. Variation of irradiation time. Test blank glass slides in the same way. According to the transmission spectrum of CsxWO3 coated glass, it can be seen that CsxWO3 coated glass with different cesium content has a near-infrared shielding trend of high visible light transmittance and low near-infrared light (800-1100nm) transmittance, and the CsxWO3 coated glass The near-infrared shielding trend increases with the increase of cesium content, and the near-infrared shielding trend of Cs0.33WO3 coated glass is the best. The transmittance of the region decreased by about 12%.

Thermal Insulation Effect of CsxWO3 Coated Glass
      According to the experimental results, there are obvious differences in the heating rate of the CsxWO3 coated glass with different cesium content and the blank uncoated glass. CsxWO3 films with different cesium contents have good thermal insulation effect, and the thermal insulation effect of CsxWO3 films increases with the increase of cesium content, among which Cs0.33WO3 films have the best thermal insulation effect, and the thermal insulation temperature difference can reach 13.5℃ . The thermal insulation effect of CsxWO3 film comes from the near-infrared (800-2500nm) shielding performance of CsxWO3. Generally, the better the near-infrared shielding performance, the better its thermal insulation performance.