The transparency of cesium tungsten bronze thermal insulation film is one of its important characteristics.
Cesium tungsten bronze transparent heat insulation film is a film coated on a glass substrate by adding cesium tungsten bronze nano slurry to acrylic emulsion. In addition to effectively blocking part of the infrared rays caused by the thermal effect of sunlight, it can also ensure the efficient passage of visible light. In summer, the interior also has good lighting when avoiding sudden temperature rises. Studies have shown that the transmittance of cesium tungsten bronze transparent heat insulation film at 950nm is 9.2%, that is, the near-infrared barrier rate of this band is 90.8%, and the transmittance of visible light at 550nm is 71%. For transparent thermal insulation films, the general opinion of the industry on high-quality films is that under the premise that the visible light transmittance at 550nm is 70%, the barrier rate at 950nm must be above 90%, so cesium tungsten bronze films have better transparent barrier properties. Thermal properties, and the haze is 0.5%, which also meets the requirements of optical grade films.
The weather resistance of cesium tungsten bronze insulation film is another important characteristic. The weather resistance of cesium tungsten bronze heat insulation film is divided into heat weather resistance and humidity weather resistance.
In addition to the heat insulation and transparency properties of the film, which are the data indicators that people are most concerned about, the weather resistance is also a very important indicator. Experiments have shown that the cesium tungsten bronze transparent heat-insulating film has good weather resistance, because the appearance of the film does not change significantly after it is continuously irradiated by a xenon lamp for 72 hours.
The cesium tungsten bronze film also has good humidity and weather resistance, and the actual service life is about 20a, which can greatly reduce the use cost of the film. The researchers soaked the heat-insulating film in hot water at 60°C for 168 hours, and measured that the infrared rejection rate of the film only decreased by 1.8%, which indicated that the oxygen vacancies in the cesium tungsten bronze nanopowder did not interact with the water vapor in the air significantly. The role of oxygen vacancies is still high, the absorption of infrared rays is still strong, and the ambient temperature and humidity in daily use are much lower than the above situation, so the service life of the film is longer.
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