Cesium tungsten oxide is an important raw material for preparing sunshade glass. Wherein, cesium tungsten oxide powder used is often Cs0.33WO3 powder with good dispersion. And the powder is prepared into dispersion at first. And then the Cs0.33WO3 dispersion is used to produce heat insulation film for applying to the sunshade glass with high transparency and excellent near-infrared shielding performance. In this process, the experts studied the Cs0.33WO3 powders and its dispersion and found that:
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Ball-milling is conducive to the dispersion of Cs0.33WO3 powders. Uniform particle size and stable colloidal Cs0.33WO3 dispersion could be obtained by ball-milling for 3 h with 1 mm size of ZrO2 bead, and the optimum quantity of beads was determined to be 5 or 6 times the weight of the Cs0.33WO3 suspension liquid. Polyvinyl alcohol and titanate coupling agent have better dispersion effect on Cs0.33WO3 colloidal solution than poly-carboxylic salt dispersant. In addition, adding appropriate dispersant after ball-milling could further improve the Cs0.33WO3 colloidal dispersion stability, which is favorable for Cs0.33WO3 particles continuous distribution in the coatings and improving its near-infrared shielding properties.
