Tungsten Trioxide Applied for Kitchen Thermal Insulating Film

Tungsten trioxide is a semiconductor material with special optical properties, so it is often used to prepare new heat insulation materials such as kitchen thermal insulating film. With the applications of tungsten oxide nano materials in the field of thermal insulation, more and more experts and scholars have noticed it. They started to focus on tungsten oxide, for example, how to prepare tungsten oxide? The following is a method for preparing tungsten trioxide by treating seed sodium tungstate solution.

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A Preparation Method of Tungsten Trioxide

Step One: Prepare the 45% sodium tungstate aqueous solution, adjust the pH of the solution to 4.9 with hydrochloric acid, hydrothermally reacted in a high pressure reaction kettle for 12 hours, filtering, concentrating and crystallizing the obtained precipitate to obtain seed crystal.

Step Two: Add the seed crystal to the 45% sodium tungstate solution to obtain a mixture of the sodium tungstate solution and the seed crystal, and the mass ratio of the seed crystal to the sodium tungstate in the solution is 1: 4.5.

Step Three: The above mixture is placed in a stainless steel high-pressure reaction kettle, and is hydrothermal reacted under intense stirring conditions at 200 °C for 12 hours. After that, stop stirring. And the reaction product slurry is obtained after cooling to room temperature.

Step Four: The reaction product slurry is filtered and washed to obtain a filter cake and a mother liquor, and the filter cake is baked at 350 °C to obtain tungsten trioxide.

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