Method for photocatalytically rendering a surface of a...

B - Operations – Transporting – 05 – D

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B05D 5/10 (2006.01) C03C 17/23 (2006.01) C03C 17/25 (2006.01) C09K 3/18 (2006.01) G02B 1/10 (2006.01)

Patent

CA 2215925

The surface of a substrate is coated with an abrasion-resistant photocatalytic coating comprised of a semiconductor photocatalyst. Upon irradiation by a light having a wavelength of an energy higher than the bandgap energy of the photocatalyst, water is chemisorbed onto the surface in the form of hydroxyl groups (OH-) whereby the surface of the photocatalytic coating is rendered highly hydrophilic. In certain embodiments, the surface of a mirror, lens, or windowpane is coated with the photocatalytic coating to exhibit a high degree of antifogging function. In another embodiment, an article or product coated with the photocatalytic coating is disposed outdoors and the highly hydrophilic surface thereof is self-cleaned as it is subjected to rainfall. In a still another embodiment, an article is coated with the photocatalytic coating and, when the article is soaked in, rinsed by or wetted with water, fatty dirt and contaminants are readily released without resort to a detergent.

L'invention concerne un procédé pour rendre la surface d'un matériau de base ultrahydrophile, consistant à appliquer à la surface une couche de revêtement contenant un matériau semi-conducteur photocatalytique tel que l'oxyde de titane et à effectuer une étape de photoexcitation du matériau photocatalytique pour ajuster l'angle de contact de la surface de la couche ci-dessus avec l'eau à 10 DEG environ ou moins. Lorsque ce procédé est appliqué à la surface d'un matériau de base tel qu'un miroir, une lentille ou un panneau de fenêtre, les gouttes d'eau cessent de croître et le matériau de base devient fortement antibuée. Les contaminants ne se déposent pas sur les surfaces d'articles traitées par ce procédé et elles sont facilement nettoyées par l'eau de pluie.

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