Hydrophilic mirror coated tio2 membrane on chrome plate and manufacturing process thereof

Abstract

The present invention relates to a hydrophilic photocatalyst and a process of preparation thereof to obtain a titanium dioxide (TiO2) layer of an anatase structure having an excellent photocatalystic effect on a chromium substrate, and in particular to a hydrophilic photocatalyst and a process for preparation thereof including: coating a titanium dioxide (TiO2) layer of an amorphous form on the substrate while maintaining the temperature of the substrate below 200 DEG C , coating the TiO2 layer of a pure anatase structure on the TiO2 layer of the amorphous form, and coating a silicon dioxide layer on the TiO2 layer of the pure anatase structure, wherein a super-hydrophilic property having a contact angle below 10 degrees showing a photocatalystic effect by ultraviolet irradiation appears within 1 hour after UV irradiation and a hydrophilic property having a contact angle below 20 degrees between the substrate and water drops is maintained for 18 hours.

Description

technical field [0001] The present invention relates to titanium dioxide containing anatase (TiO 2 ) layer of a hydrophilic mirror, which is formed on a chromium substrate and has an improved photocatalyst function, and the process of the mirror preparation method, especially a photocatalyst mirror that reduces reflectivity and improves hydrophilicity. Background technique [0002] In general, titanium dioxide (TiO 2 ) have different catalytic properties in different crystal forms including anatase, rutile or brookite. [0003] Among them, anatase (3.2eV) and rutile (3.OeV) TiO 2 Has a photo-excited hydrophilic effect, and the anatase structure is superior to the rutile structure in photosensitivity, because the anatase TiO 2 The band gap is larger than that of rutile TiO 2 . [0004] To exhibit hydrophilicity, anatase TiO 2 It must be irradiated with short-wave ultraviolet light, and in order to maintain hydrophilicity at night, it is better to delay the recombination...

AI Technical Summary

Problems solved by technology

[0011] However, when SiO 2 When the thickness of the layer is too thick, it is difficult to make TiO 2 The electrons and holes generated by the layer are exposed to the surface, resulting in weak hydrophilic properties. Therefore, the existing technology unfavorably places the uppermost SiO 2 The thickness of the layers is limited to less than 15 nm and the coatings are formed on top of the glass substrate and the chrome layer, leading to complex fabrication processes and anatase structure TiO 2 suboptimal crystal structure

[0012] Further, if an oxide layer is formed on the chrome plating layer in order to control the reflectivity, the oxide layer will reduce the adhesion strength with the metal

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