W18O49 is an important material for fabricating infrared-shielding film, to sufficiently transmit visible rays and shield invisible near-infrared rays. Some experts prepared W18O49 powder by heating a mixture containing a predetermined amount of a tungsten compound at 550 °C in a reductive atmosphere for 1 h, then cooled to room temperature once in an argon atmosphere.
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The experts mixed W18O49 powder, the solvent, and the dispersant, then subjected to dispersion treatment to obtain a dispersion solution. The dispersion solution and a UV-curable hardcoat resin are mixed to obtain a solution of fine particle dispersion of infrared-shielding material. The solution of the fine particle dispersion of infrared-shielding material is applied on a PET resin film to form a film, then cured to obtain an infrared-shielding film. The prepared infrared-shielding thin film can sufficiently transmit visible rays without half-mirror shaped appearance, and can efficiently shut invisible near-infrared rays with wavelength range of 780 nm or more. This preparation method requires no large-scale apparatus when forming a film on a substrate, while eliminating a heat treatment at high temperature after film formation, and having a spectral characteristic such as transparency with no change of color tone.
