Doping Tungsten in Vanadium Dioxide to Produce Thermochromism Coating (3)

After hydrolysis VOSO4 and NaSO4 and calcination obtain tungsten-doped vanadium dioxide powder, and then can use vanadium dioxide and tungsten-doped vanadium dioxide powder to producing thermochromism coating. Producing process as follows:
1. First putting VO2 powder, xylene, oil dispersants and ceramic milling beads in a planetary ball mill, 650r/min grinding 20 ~ 30min to obtained VO2 suspension.
2. The suspension was mixed with resin to produce coating with solid content 40% which help VO2 can maintain long-term stable storage.
3. Using a wire bar to make rein form a film and then dried at room temperature. The film thickness is 60 to 70 um.
During the producing process the longer grinding time, grinding grain trend has grown, easy aggregates and VO2 phase transition performance will continue to decline. Comprehensive experimental data found grinding time is about 20 ~ 30min can get the smallest average particle size of 275nm. Prepared coatings below TC without significant spectrum absorption or transmission peaks， at TC above, the coating in near-infrared band (1000 ~ 2500nm) exhibit low permeability, 400 ~ 1000nm band transmission slight increase, this is because when the VO2 powder metal-semiconductor phase transition the band gap change cause transmittance change.

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