Tungsten acid can be applied for the preparation of heat insulation coating. Then, this type of coating has good ding of shielding infrared rays, and therefore can be applied as thermal insulation film for buildings, automobiles, and the like.
Shielding Principle of Infrared Rays
Infrared rays (IR) have longer wavelengths than those of visible rays. IR wavelengths extend from the nominal red edge of the visible spectrum at 700nm, to 1mm.
Heat insulation coating materials are mostly added with near-infrared absorber to achieve shielding effect. Near-infrared absorbers can be divided into organic absorbers and inorganic absorbers. Organic absorbers are mainly synthetic dyes. Inorganic absorbents are mainly metal complexes. The organic absorbents utilize the high refractive index of crystalline metal complexes to cause scattering when near-infrared light is irradiated onto the surface of the material.
At present, metal complexes are widely used in the field of heat insulation materials. It means that tungstic acid will be found in the field of heat insulation coating.
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