Photocatalytically Active Coating of a Substrate
First Claim
1. A photocatalytically active coating of a substrate composed of at least two layers produced by solution chemistry and with at least one first underlayer applied to the substrate and composed of an inorganic polymer, and comprising the metal oxides SiO2 and ZrO2 covalently bonded to one another, and at least one second overlayer composed of TiO2 particles, characterized in that the underlayer comprises less than 0.5% by weight of TiO2 particles, is pore-free, and comprises SiO2 and ZrO2 in a ratio by weight of from 50:
- 50 to 95;
5.
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Abstract
The invention relates to a photocatalytically active coating of a substrate, which is composed of a protective layer and photocatalytically active particles that are applied thereto, the protective layer having no photocatalytic activity. The protective layer preferably contains ZrO2 and SiO2.
25 Citations
10 Claims
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1. A photocatalytically active coating of a substrate composed of at least two layers produced by solution chemistry and with at least one first underlayer applied to the substrate and composed of an inorganic polymer, and comprising the metal oxides SiO2 and ZrO2 covalently bonded to one another, and at least one second overlayer composed of TiO2 particles, characterized in that the underlayer comprises less than 0.5% by weight of TiO2 particles, is pore-free, and comprises SiO2 and ZrO2 in a ratio by weight of from 50:
- 50 to 95;
5. - View Dependent Claims (2, 3, 4, 10)
- 50 to 95;
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5. A process for production of photocatalytically active coatings on a substrate, characterized by the following steps of the process:
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a. coating of a substrate with an inorganic polymer by solution chemistry via application of a suspension of the inorganic polymer or its chemical precursors in an organic suspension medium, b. complete or partial removal of the organic suspension medium, to give an underlayer. c. application of a dispersion composed of TiO2 particles in an organic dispersion medium to the underlayer. d. complete or partial removal of the organic dispersion medium to give an overlayer. e. heat-treatment of the under- and overlayer at from 20 to 120°
C. for from 10 to 300 sec, with the proviso that the underlayer is composed of an inorganic polymer, comprises less than 0.5% of TiO2 particles, is pore-free, and comprises SiO2 and ZrO2 in a ratio by weight of from 50;
50 to 95;
5. - View Dependent Claims (6, 7, 8, 9)
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Specification