Tungsten acid may be applied for thermal insulation paper to make this kind of paper has good shielding effect on light intensity and ultraviolet ray. In other words, the paper will have high heat insulation effect. Also, it will have the advantages of no pollution, corrosion resistance and wear resistance.
As we all have known, ultraviolet rays cause textile, leather and furniture fading. And the UV is also one of the important factors of skin cancer. As people's living standard has improved, the demand for thermal insulation materials such as thermal insulation paper and thermal insulation film will increase as well.
Preparation of Tungstic Acid
Ammonium paratungstate (APT) is monoclinic pentahydrate APT, which is produced by continuous evaporative crystallization with chemical formula of 5(NH4)2O•12WO3•5H2O. During the dissociation process, part of ammonia and water are removed to generate beige ammonium metatungstate (AMT). The reaction formula is as follows:
5(NH4)2O•12WO3•5H2O=3(NH4)2O•12WO3•XH2O+4NH3↑+(7-X)H2O
And decomposition product AMT is in amorphous state, which is soluble in water to make slurry. Then, liquid-liquid reaction is performed when it is decomposed by acid. Its reaction formula is as follows:
3(NH4)2O•12WO3•3H2O+6H2O+6HCL=12H2WO4+6NH4CL
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