Photocatalytic coating film and method for producing same

Patent metadata

Field	Value
Publication number	US-9517459-B2
Application number	US-201214124292-A
Country	US
Kind code	B2
Filing date	Jun 6, 2012
Priority date	Jun 7, 2011
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

Provided is a photocatalytic coating film that can develop excellent photocatalytic activity and exhibit superior adhesion to an adherend surface.
The photocatalytic coating film is obtained by applying and drying a photocatalytic coating composition containing at least rod-like or needle-like titanium oxide particles and a binder component so that the photocatalytic coating film contains the titanium oxide particles in a content of 0.5 g/m 2 or more. The photocatalytic coating film contains the titanium oxide particle in a content per unit volume (1 m 2 by 1 μm thick) of less than 3.0 g. The titanium oxide particles preferably have an aspect ratio of 1.5 or more, the aspect ratio specified as the ratio of a long side length to a short side length of particle. The compositional ratio (by weight) of the titanium oxide particles to the binder component in the photocatalytic coating film is preferably from 1:6 to 30:1.

First claim

The invention claimed is:

1. A photocatalytic coating film obtained by applying and drying a photocatalytic coating composition comprising at least rod-shaped or needle-shaped titanium oxide particles and a binder component so that the photocatalytic coating film contains the titanium oxide particles in a content of 0.5 to 3.0 g/m 2 , the photocatalytic coating film containing the titanium oxide particles in a content of less than 3.0 g per unit volume (1 m 2 by 1 μm thick) and having a porous structure, the titanium oxide particles being rutile titanium dioxide particles bearing a transition metal compound, the transition metal compound being selectively supported on, of exposed crystal faces of the titanium oxide particles, (111) face acting as an oxidation site.

2. The photocatalytic coating film according to claim 1 , wherein the titanium oxide particles have an aspect ratio of 1.5 or more, the aspect ratio specified as a ratio of a long side length to a short side length of particle.

3. The photocatalytic coating film according to one of claims 1 and 2 , wherein the photocatalytic coating film has a compositional ratio (by weight) of the titanium oxide particles to the binder component of from 1:6 to 30:1.

4. The photocatalytic coating film according to claim 1 , wherein the transition metal compound is an iron compound.

5. The photocatalytic coating film according to claim 1 , wherein the binder component comprises at least one compound selected from the group consisting of titanium peroxide, silicon compounds, and fluorocarbon resins.

6. The photocatalytic coating film according to claim 1 , wherein the binder component comprises at least titanium peroxide.

7. A method for producing the photocatalytic coating film of claim 1 , the method comprising the steps of:
preparing a photocatalytic coating composition comprising at least rod-shaped or needle-shaped titanium oxide particles and a binder component, the titanium oxide particles being rutile titanium dioxide particles bearing a transition metal compound, the transition metal compound being selectively supported on, of exposed crystal faces of the rutile titanium oxide particles, (111) face acting as an oxidation site; and
applying and drying the photocatalytic coating composition.

8. The method for producing the photocatalytic coating film, according to claim 7 , further comprising the step of supporting a transition metal compound on rod-shaped or needle-shaped rutile titanium dioxide particles under exciting light irradiation to give rod-shaped or needle-shaped rutile titanium dioxide particles bearing the transition metal compound, the transition metal compound being selectively supported on, of exposed crystal faces of the rutile titanium dioxide particles, (111) face acting as an oxidation site.

9. A photocatalyst-coated article comprising: a substrate; and the photocatalytic coating film of claim 1 .

10. The photocatalyst-coated article according to claim 9 , wherein the substrate is made from a plastic material.

11. The photocatalytic coating film according to claim 1 , having a thickness of 1.5 μm or less.

Assignees

• Nakai Toru
• Funaki Yoshinori
• Nakamura Toshikazu
• Daicel Corp

Inventors

• Nakai Toru
• Funaki Yoshinori
• Nakamura Toshikazu

Classifications

• B01J37/0215

  Coating · CPC title

• B01J35/50

  characterised by their shape or configuration · CPC title

• B01J35/391

  Physical properties of the active metal ingredient · CPC title

• B01J35/39 Primary

  Photocatalytic properties · CPC title

• B01J35/06

  Operations & Transport · mapped topic