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Photocatalyst-coated object and photocatalyst coating liquid therefor

A photocatalyst, coating liquid technology, applied in catalyst activation/preparation, physical/chemical process catalyst, paint containing biocide, etc., can solve various problems such as reduction of effect, and achieve excellent film strength and long-term maintenance. , Excellent self-cleaning effect

Inactive Publication Date: 2012-07-11
TOTO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] If the amount of photocatalyst in the photocatalyst layer is small, although the above-mentioned possibility of decomposing or deteriorating the base material is reduced, the various functions obtained by the photocatalyst may also be reduced as a result.

Method used

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  • Photocatalyst-coated object and photocatalyst coating liquid therefor
  • Photocatalyst-coated object and photocatalyst coating liquid therefor
  • Photocatalyst-coated object and photocatalyst coating liquid therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] First, as a substrate, a 50 mm×100 mm flat colored organic-coated body was prepared. The colored organic coating body is a general-purpose siloxane-modified acrylic paint (siloxane modified acrylic paint) coated with carbon black powder on a sealed kiln-type clapboard base material (Saiding base material). The silicon atom content in the permanent acrylic resin is 1% by mass), and it is fully dried and cured.

[0094] Next, a photocatalyst coating liquid is prepared. This photocatalyst coating solution was prepared by mixing an aqueous dispersion of anatase-type titanium oxide (average particle diameter: 42 nm, alkaline) and water-dispersible colloidal silica (average particle diameter: 14 nm, alkaline) using water as a solvent. sex) with TiO 2 The solid composition of SiO 2 The mass ratio of the solid content of 3.10:96.90 was mixed, and the photocatalyst coating liquid whose solid content concentration was 5.5 mass % was prepared.

[0095] The obtained photocataly...

Embodiment 2

[0097] As the photocatalyst coating liquid, a photocatalyst coating liquid prepared by mixing an anatase-type titanium oxide aqueous dispersion (average particle diameter: 42 nm, basic) and water-dispersed colloidal silica using water as a solvent was used. (average particle size: 14nm, alkaline) as TiO 2 The solid composition of SiO 2 The mass ratio of the solid component is 4.60: 95.40 mixing, is prepared into the photocatalyst coating liquid that solid component concentration is 5.5 mass %, and makes the coating amount of photocatalyst coating liquid on the colored organic coating body be 30g / m 2 , except that, a sample was produced under the same conditions as in Example 1.

[0098] In order to measure a porosity, the coated body sample was obtained similarly to the above except having made a glass plate into a base material, and dried after coating at 90 degreeC. The porosity was 28% by volume.

Embodiment 3

[0100] As the photocatalyst coating solution, a photocatalyst coating solution prepared by mixing anatase-type titanium oxide aqueous dispersion (average particle diameter: 10 nm, acidic), water-dispersed colloidal dioxide Polycondensation product of silicon (average particle size: 14nm, acidic, alumina coating) and tetraethoxysilane (SiO 2 Conversion concentration: 40% by mass, solvent: ethanol, water) as TiO 2 The solid content of colloidal silica and the condensation polymer of tetraethoxysilane are pressed by SiO 2 Samples were produced under the same conditions as in Example 2 except that the mass ratio of the converted dry mass was 4.60:90.40:5.00 and mixed to prepare a photocatalyst coating liquid having a solid content concentration of 5.5% by mass.

[0101] In order to measure a porosity, the coated body sample was obtained similarly to the above except having made a glass plate into a base material, and dried after coating at 90 degreeC. The porosity was 21% by vol...

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Abstract

Provided is a photocatalyst-coated object which prevents corrosion down to a substrate, particularly an organic substrate, and which also has various excellent characteristics, especially toxic gas decomposition capability and long-term retention of self-cleaning performance using the hydrophilic property of the photocatalyst. The photocatalyst-coated object comprises a substrate and a photocatalyst layer disposed on the substrate. The primary components of the photocatalyst layer are photocatalyst particles in an amount greater than 3 mass% but less than 5 mass%, and inorganic oxide particles in an amount greater than 85 mass% but less than 97 mass%, assuming that the total amount of the photocatalyst layer is 100 mass%.

Description

technical field [0001] The present invention relates to a photocatalyst-coated body as an exterior material for buildings and the like, and a photocatalyst coating liquid for forming the coated body. Background technique [0002] Photocatalysts such as titanium oxide have been used in many applications such as building exterior materials in recent years. By using a photocatalyst, it is possible to decompose various harmful substances using light energy or to hydrophilize the surface of a substrate coated with a photocatalyst to easily wash away dirt adhering to the surface with water. [0003] For example, a technique for obtaining a photocatalyst body by forming a coating film containing silica sol and photocatalytic titanium dioxide as binder components on a substrate is known (for example, JP-A-11-169727 (Patent Document 1)). In this technology, relative to titanium dioxide, the amount of silica sol added is according to SiO 2 The standard is 20 to 200 parts by weight. ...

Claims

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Application Information

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IPC IPC(8): B01J35/02B01J37/02C09D1/00C09D5/16C09D7/12C09D201/00E04F13/02E04F13/08C09D7/61
CPCB01J37/0219C09D7/1216E04F13/08C09D5/08C09D5/1618B01J35/023B01J37/0221B01J35/004C09D7/1266C08K3/36C08K3/22E04F13/02B01J21/063B01J37/0045C09D7/61C09D7/67B01J35/40B01J35/39B01J37/02C09D1/00C09D5/16B01J35/00
Inventor 早川信龟岛顺次表敷浩二北崎聪池田猛菅野充诚岛井曜
Owner TOTO LTD
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