Cesium Tungsten Bronze Preparation by Heat Insulation Film
Cesium tungsten bronze (CsxWO3) is a kind of tungstate powder synthesized by solid phase method or liquid phase method with cesium carbonate and sodium tungstate as raw materials.
Cesium tungsten bronze is also called cesium tungstate. As everyone knows, the sun's heat is mainly concentrated in the two part of the visible light and near infrared light, cesium tungsten bronze CsxWO3 particles can ensure good visible light transmittance, and can cover most of the near infrared caused by heat, and cesium tungsten bronze is an ideal material for manufacturing automotive insulation film.
However, in the manufacture of cesium tungsten bronze CsxWO3 heat insulation film, it is found that CsxWO3 particles are difficult to disperse in solution, and attached to the heat insulation film. In order to realize the near infrared shielding function of cesium tungsten bronze CsxWO3 particles, the dispersion and stability of particles in slurry must be improved, particle dispersion is enhanced by ball milling, ultrasonic addition, dispersant and surface modification.
Some scholars use polyvinyl alcohol (PVA), polyvinyl butyral (PVB) and polyvinyl pyrrolidone (PVP) of the three kinds of membrane material to test cesium tungsten bronze heat insulation film preparation. After the Cs0.33WO3 slurry was obtained by hydrothermal method, the slurry was added into the 15L film solution after 3 hours ball milling and 20 minute ultrasonic wave addition, at 80 °C, the water was mixed with 10min. Then, the foam 1% was added and the mixture was heated and stirred 20min, finally, three different materials of PVA, PVB, PVP cesium tungsten bronze coating film were prepared.
The results show that the average particle size of Cs0.33WO3 particles decreases after milling 3H with water as solvent. At the same time, the dispersion stability has been greatly improved. After adding polyethylene glycol - 400, the stability of cesium tungsten bronze particle dispersion is further improved, showing excellent near infrared shielding performance, through the transverse contrast of three kinds of film materials, scholars believe that PVA and PVP are Cs0.33WO3 coatings for film-forming substances has good transmittance of visible light and near infrared shielding property, at the same time, the cesium tungsten bronze coating with PVP as film forming material has the best adhesion strength.
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