Tungsten trioxide, WO3, may be applied for thermal insulation paper as it has the characteristics of high temperature resistance, fire resistance, high thermal insulation, corrosion resistance and long service life. As different preparation methods will have a certain impact on the prepared WO3, research on the preparation method of WO3 has certain guiding significance for the preparation of paper with thermal insulation properties.
In the 1980s, some methods were used to prepare tungsten trioxide, such as electron beam evaporation deposition method, electrodeposition method, spray pyrolysis method, and sol-gel method, etc. Among them, the sol-gel method can be used to prepare WO3 with different crystals form and density. And this method has been adopted by most scholars as it is easy to control the composition and particle size of the product, and easy to produce thin film of large area and uniform surface.
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