Photocatalyst-containing silicone resin composition, and coated article having cured coating film therefrom

A resin composition, photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc.

Inactive Publication Date: 2005-09-21
MATSUSHITA ELECTRIC WORKS LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Thus, from the viewpoint of expanding the applicability of photocatalysis by lowering the heat treatment temperature, conventional photocatalyst-containing compositions still have a lot of room for improvement.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 356 parts of methanol were added to 208 parts of tetraethoxysilane, and then 18 parts of water and 18 parts of 0.01 mol / L hydrochloric acid were mixed thereto. Using a dispersing mixer, mix the resulting mixture well. Thereafter, the resulting mixture was kept at 60° C. for 2 hours in a constant temperature room to obtain a silicone resin having a weight average molecular weight of 950. To this silicone resin, add as TiO 2 Titanium oxide aqueous sol (solid content 21%, average particle size: 60nm), Zr(OC) as a zirconium-containing compound 4 h 9 ) 3 (C 5 h 7 o 2 ) and as SiO 2 Particle silica methanol sol (average particle diameter: 50 nm).

[0052] As for the weight ratio in terms of oxides of these components at this time, (TiO 2 weight): (weight of zirconium-containing compound): (weight of silicone resin): (SiO 2 The weight of particles) is 1:0.05:1:0.5. Since the mixture was diluted with methanol, the total solids content was 5%. Thus, the photocatalyst...

Embodiment 2

[0054] According to substantially the same method as in Example 1, prepare the photocatalyst-containing silicone resin composition of Example 2, except that Zr(OC 4 h 9 )(C 5 h 7 o 2 )(C 6 h 9 o 3 ) 2 as a zirconium-containing compound. According to the same method as in Example 1, a coating film of the composition was formed on a glass substrate.

Embodiment 3

[0056] According to substantially the same method as in Example 1, prepare the photocatalyst-containing silicone resin composition of Example 3, except that (TiO 2 weight): (weight of zirconium-containing compound): (weight of silicone resin): (SiO 2 The weight of particles) is 1:0.01:1:0.5. According to the same method as in Example 1, a coating film of the composition was formed on a glass substrate.

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Abstract

The composition allows the formation of a coating film exhibiting high photocatalytic activity, good durability and high transparency by the firing at a relatively low temperature (for example, ca. 100 DEG C).A photocatalyst-containing silicon resin composition which contains TiO2, a compound containing a Zr element, a hydrolyzable silicone resin and a Si element containing compound containing SiO2 particles, wherein the content of the compound containing a Zr element in terms of an oxide is 0.005 to 0.1 parts by weight relative to 1 part by weight of TiO2, the content of the Si element containing compound in terms of an oxide is 0.5 to 6.0 parts by weight relative to 1 part by weight of TiO2, and the content of SiO2 particles is 0.1 to 3 parts by weight relative to 1 part by weight in terms of an oxide of the hydrolyzable silicone resin.

Description

technical field [0001] The present invention relates to a photocatalyst-containing silicone resin composition having the ability to provide a film having high photocatalysis and durability at a relatively low temperature, and a coated article having a cured film of the composition. Background technique [0002] By irradiating light (UV light) having an excitation wavelength (for example, 400 nm) to a photocatalyst represented by titanium dioxide, positively charged holes are generated. Positively charged holes capture electrons from surrounding OH (hydroxide ions) etc. to generate very unstable OH radicals (active oxygen species). OH radicals have the ability to decompose organic matter through oxidation. Therefore, by coating the photocatalyst on the base material, the following effects are expected: a self-cleaning effect of decomposing pollutants (for example, carbon distillate or tar found in automobile exhaust) adhering to the base material; Deodorizing effect of deco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/02B01J35/00C09D183/04
CPCC09D183/04B01J35/004C08K3/22C08K3/36C08K2003/2241
Inventor 辻本光田丸博高滨孝一田中启介田中博一尾花茂树
Owner MATSUSHITA ELECTRIC WORKS LTD
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