Cesium tungsten oxide for automobile sunroof
In addition to tungsten oxide superfine powder, traditional automobile sunroof can also be modified with caesium-tungsten oxide nanoparticles. Here, it is worth noting that tungsten oxide and cesium-tungsten bronze particles can effectively improve the visible light transmittance, near infrared absorption performance and ultraviolet blocking ability of glass products, so as to make it more in line with the future development requirements of the country.Let's understand the difference between tungsten oxide and cesium oxide tungsten.
Tungsten oxide is an oxide of the transition metal tungsten.According to the different oxygen content, it can be divided into yellow tungsten oxide, blue tungsten oxide, purple tungsten oxide and tungsten oxide.Note: Common additives for glass are the preceding three tungsten oxides.The study shows that the infrared and ultraviolet transmittance of the glass containing tungsten oxide nanomaterials are 91% and 91% respectively, and the transmittance of visible light is also high.
Production method of tungsten oxide: ammonium tungstate tungsten concentrate by sodium hydroxide alkali hydrolysis, with hydrochloric acid neutralization, and then with ammonium chloride action, to generate ammonium tungstate, and then add hydrochloric acid acid hydrolysis reaction, to generate tungstate acid, and then after roasting decomposition, crushing, you can get the product.
Cesium oxide tungsten is also a compound of tungsten, the chemical formula is Cs0.33WO3, the near infrared region of its blocking rate up to 95%, visible light transmittance (380-780nm) is 70%, and the middle and far infrared region (8-10μm) has a good absorption effect, in the ultraviolet region (200-380nm) also has strong shielding properties.
Production methods of cesium-tungsten bronze are as follows :(1) Preparing solution with analytical pure sodium tungstate Na2WO4·2H2O as raw material;(2) The tungstate sol is obtained through the exchange of cationic resin, and citric acid (solution and cesium carbonate Cs2CO3 solution are added and stirred evenly to obtain the precursor solution of hydrothermal reaction;(3) Put the precursor solution into the autoclave, react at 190 ℃ for 3 days, and then go through ultrasonic washing, alcohol washing, centrifugation and drying to get the product.
