Nano Tungsten Trioxide Applied for Dining Room Thermal Insulating Film

Nano tungsten trioxide is often used to prepare dining room thermal insulating film due to its advantages of electrochromism and photochromism. And the prepared thin film is highly transparent to visible light. Also, the transparent heat insulation film has high shielding performance to near-infrared radiation and UV. So, now, more and more researchers have begun to pay attention to this new thermal insulation material containing the preparation of tungsten trioxide. A method for preparing tungsten trioxide nano powder is mainly introduced below.

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A Preparation Method of Nano Tungsten Trioxide for Dining Room Thermal Insulating Film

Step One: Heat the saturated ammonium tungstate solution to 69 °C, then add ammonium chloride (addition amount is 8-13 g/L), and stir for 0.5-1 h;

Step Two: Add tartaric acid (addition amount is 11-14 g/L), ethylenediamine tetrapropionic acid (addition amount is 23-32 g/L) and diethanolamine (addition amount is 6-9 g/L) in order. Stir to completely dissolve and continue stirring for 1-2 h;

Step Three: Continuously stirring, add 320-380 ml/L of nitric acid to form a tungstic acid gel;

Step Four: Put the gel in a heating oven to dry at 140-150 °C, the heating rate is set to 1-2 °C/min, hold for 1-2 h, and then increase the temperature to 340-380 °C at 2-3 °C/min, holding for 2-3 h, calcining, and finally the nano tungsten trioxide can be obtained by ball milling.

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