There are many kinds of infrared absorption heat insulation materials, cesium tungsten bronze (CsxWO3) film has good near-infrared shielding performance, is expected to replace the existing ITO conductive glass, as a window material, can be used as a good near-infrared heat insulation material, in automobiles It has a very attractive application prospect in the field of construction and construction. Cesium tungsten bronze (CsxWO3) is a non-stoichiometric functional compound with a special structure of oxygen octahedron, which has low resistivity and low-temperature superconductivity.
Modern buildings use a large number of thin and transparent external materials such as glass and plastic. While these materials improve indoor lighting, they also cause sunlight to enter the room and cause indoor temperature to rise. In order to balance the rise in indoor temperature caused by sunlight, in addition to the common use of air conditioners to cool down, the most effective way is to use nanoparticles with the ability to absorb infrared light, such as antimony-doped tin dioxide (ATO), indium tin oxide ( ITO), lanthanum hexaboride and cesium tungsten bronze (CTO) nanoparticles are added to the resin to make a transparent thermal insulation coating, which is directly coated on glass or sunshade cloth, or first coated on PET (polyester) film, Then paste the PET film on the glass (such as car film), or make it into a plastic sheet, such as PVB (polyvinyl butyral), EVA (ethylene-vinyl acetate copolymer) plastic, and then these plastic sheets and tempered glass Composite, also play a role in blocking infrared rays, so as to achieve a transparent heat insulation effect.
Among the above-mentioned nanoparticles that can absorb infrared rays to achieve transparent heat insulation, nano-cesium tungsten bronze (Cesium Tungsten Bronze) has the best near-infrared absorption characteristics, and cesium tungsten bronze (Cs0.33WO3) nano-powder is the best in the near infrared It is a new functional material with strong absorption in the infrared region (wavelength 800-1200nm) and high transmittance in the visible light region (wavelength 380-780nm). At the same time, it also has a good absorption effect in the middle and far infrared region (8-10μm). Nano-cesium tungsten bronze is currently the best-performing transparent heat-insulating material for automotive film, PVB heat-insulating laminated film, and transparent heat-insulating coating. Adding about 1.3 grams per square meter to the coating can achieve a 950nm infrared rejection rate of more than 90%. The transmittance of visible light at 550nm is over 70%, and the haze is less than 0.5%.
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