Self-cleaning uv reflective coating

Details Self-cleaning uv reflective coating Self-cleaning uv reflective coating

A - Human Necessities

61

L

A61L 9/20 (2006.01) B01J 21/06 (2006.01) C09D 5/33 (2006.01) C09K 15/02 (2006.01) C23F 15/00 (2006.01)

Patent

CA 2458725

A photo-catalytic overcoat on a UV reflective paint layer is employed to maintain high reflectance for long periods of time by continuously removing organic films when exposed to UV light. Advantageously, nano-particles comprising the photo-catalytic overcoat are composed of a semiconductor material that lead to the production of oxygen and hydroxyl free radicals when illuminated with UV light in the presence of water vapor. Some of these free radicals oxidize organic surface films, converting the surface films into gaseous H2O and CO2. This reduces the amount of organic deposits on the surface of the reflective paint layer.

La présente invention concerne une couche de finition photocatalytique se trouvant sur une couche de peinture réfléchissant les rayons ultraviolets, qui est utilisée pour maintenir un facteur de réflexion élevé sur de longues périodes de temps, en retirant de manière continue des films organiques qui ont été exposés aux rayons ultraviolets. Il est avantageux que les nanoparticules qui constituent la couche de finition photocatalytique soient composées d'un matériau semi-conducteur induisant la production de radicaux libres d'oxygène et d'hydroxyle lorsqu'il est exposé à de la lumière ultraviolette en présence de vapeur d'eau. Certains de ces radicaux libres oxydent des films superficiels organiques, transformant alors ces films superficiels en H¿2?O et CO¿2? gazeux, ce qui permet de réduire la quantité de dépôts organiques à la surface de la couche de peinture réfléchissante.

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