Glass thermal insulation coating is a kind of coating prepared by one or more nano powder materials. The nano materials used have special optical properties, that is, they have high blocking rate in the infrared region and ultraviolet region. , has a high transmittance in the visible region. Using the transparent and heat-insulating properties of the material, it is mixed with an environmentally friendly high-performance resin and processed through a special processing technology to prepare an energy-saving and environmentally friendly heat-insulating coating. Under the premise of not affecting the glass lighting, the effect of energy saving and cooling in summer can be achieved, and the effect of energy saving and heat preservation in winter can be achieved.

In recent years, exploring new environmentally friendly thermal insulation materials has always been the goal pursued by researchers. These materials have very broad application prospects in the fields of green building energy saving and automotive glass thermal insulation - nano-powders and functional thin-film materials that have high visible light transmittance and can effectively absorb or reflect near-infrared light. Here we mainly introduce cesium tungsten bronze nanoparticles.

According to relevant records, transparent conductive films such as indium tin oxide (ITOs) and antimony-doped tin oxide (ATOs) films have been applied to transparent thermal insulation materials, but they can only block near-infrared light with wavelengths greater than 1500 nm. The cesium tungsten bronze (CsxWO3, 0＜x＜1) has high visible light transmittance and can strongly absorb light with wavelengths greater than 1100nm. That is to say, compared with ATOs and ITOs, cesium tungsten bronze has a blue shift in its near-infrared absorption peak, so it has attracted more and more attention.

Cesium tungsten bronze nanoparticles, with high concentration of free carriers, have unique optical properties, high transmittance in the visible light region, and strong shielding effect in the near-infrared region. In other words, cesium tungsten bronze materials, such as cesium tungsten bronze transparent thermal insulation coatings, can ensure good visible light transmittance (without affecting lighting), and can block most of the heat brought by near-infrared light. The absorption coefficient α of a large number of free carriers in the cesium tungsten bronze system is proportional to the free carrier concentration and the square of the wavelength of the absorbed light, so when the cesium content in CsxWO3 increases, the concentration of free carriers in the system is proportional. Gradually increase, the absorption in the near-infrared region is more obvious. In other words, the NIR shielding performance of cesium tungsten bronze increases with its cesium content.