Doping Tungsten in Vanadium Dioxide to Produce Thermochromism Coating (2)

Due to vanadium dioxide has unique properties, so it is suitable for produce thermochromism coating and be wildly used. To make thermochromism coating is by hydrolysis VOSO4 and NaSO4 with calcination to obtain tungsten-doped vanadium dioxide powder, then mixed acrylic resin with vanadium dioxide powder to obtain it. Before making thermochromism coating should to produce vanadium dioxide and tungsten-doped vanadium dioxide powder. And the producing process as follow:  
(1) Putting 0.1molVOSO4 • xH2O into 0.2molNH4HCO3 solution by constant current mercury for 1.5h. Filtered the precipitate, and then washed with deionized water and ethanol, after vacuum drying to give a vanadium hydroxide powder.
(2) The powder was placed in a ceramic boat charged with an inner diameter of 35mm quartz tube, in the front the pipe keep 40cm for preheating. Besides for protecting the reaction should pass into the nitrogen flow rate 200 ~ 1500ml / min.  And then calcinate in 573 ~ 1073K for 3 ~ 40h and the heating rate is determined by the tube furnace itself power, about 20 ℃ / min. Finally to obtain VO2 powder this is undoped.
(3) The tungsten-doped vanadium dioxide powder producing steps is similar to vanadium dioxide producing. But at the first should mixed 0.5mol / L Na2WO4 solution in proportion into VOSO4 solution.

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