Self-cleaning transparent sound barrier and process for producing same

A manufacturing method, a technology for sound insulation walls, applied in chemical instruments and methods, noise absorbing devices, instruments, etc., can solve the problems of reduced transparency, insufficient wetting, insufficient photodecomposition of dirt components, etc. Effect

Inactive Publication Date: 2003-09-10
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] That is, the existing transparent sound-insulating wall using the above-mentioned titanium dioxide composed of anatase-type crystals has insufficient photodecomposition of dirt components and insufficient hydrophilization of the surface of the sound-insulating wall (due to water contact angle). decision), even if it rains, washes with water or is exposed to water vapor, the entire surface of the substrate will not be fully wetted, and it will not be fully self-cleaning
As a result, dirt gradually remains, reducing transparency, which is a problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0022] The inventors of the present invention have found, after intensive research, that the titanium dioxide layer containing brookite-type crystals actively performs photocatalytic reactions even under weak light. And it was found that when it is used in a transparent soundproof wall, even if it is placed in a shady place, the dirt components can be decomposed by photocatalysis; and because the surface is made hydrophilic, the dirt components can be easily cleaned by rainfall, thereby maintaining long-term transparency. The present invention has been completed thus far.

[0023] That is, the present invention is a transparent sound-insulating wall in which titanium dioxide particles containing brookite-type crystals or titanium dioxide particles composed of the above-mentioned crystals exist on the surface; since titanium dioxide of brookite-type crystals is substantially present on the surface The transparent sound insulation wall, so the dirt components can be photodecomp...

Embodiment 1

[0057] Add 945ml of distilled water preheated to 95°C into a 1.5L glass reaction tank equipped with a reflux cooling tube and a stirring paddle. Then, while rotating the stirring blade at a rotating speed of about 200rpm, the liquid temperature in the tank was continued to be maintained at 95° C., and the titanium tetrachloride aqueous solution (Ti content was 14.3 mass %, and the specific gravity was 1.5 g / cm 3 ) 56g was slowly dropped into the reaction tank. As the dripping proceeds, the solution in the tank gradually begins to hydrolyze, and the entire liquid becomes a milky white sol.

[0058] After the dropping, heat to near the boiling point (104° C.); keep at this temperature for 1 hour to completely hydrolyze titanium tetrachloride. The concentration of the sol thus obtained was measured and found to be 2% by mass in terms of titanium dioxide. The obtained sol was cooled and concentrated, and chlorine generated by hydrolysis was removed by electrodialysis using an el...

Embodiment 2

[0064] Titanium tetrachloride was hydrolyzed in the same manner as in Example 1, except that hydrochloric acid was added to the reaction tank as HCl at a concentration of 1 mol / L before the titanium tetrachloride aqueous solution was dropped. The obtained sol was treated in the same manner as in Example 1 to obtain a water-dispersed titanium dioxide sol. In addition, the particles in the sol were observed in the same manner as in Example 1, and the particle diameter was measured to be 0.01 to 0.03 μm.

[0065] In the same manner as in Example 1, the crystal structure of the titanium dioxide particles contained in this sol was measured. The {121} plane and diffraction peak of the brookite crystal and the diffraction peak of the {110} plane of the main peak of the rutile crystal were measured. Furthermore, the diffraction peaks of the {004} plane of the anatase crystal were also measured. It can be seen that the obtained sol is a mixture of brookite crystals, anatase crystals ...

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Abstract

A transparent noise-barrier wall having a coating layer comprising titanium dioxide particles containing brookite-type crystal and a binder material, whereby the coating layer is adhered on an acrylic resin or a polycarbonate resin. So that high photocatalytic activity can be brought out even with a very weak light to decompose the fouling component where the surface is hydrophilized, and is ensured with duration of the transparency for a long period of time.

Description

technical field [0001] The present invention relates to a high-transparency sound-insulating wall for blocking or absorbing noise used along roads and railways on which vehicles travel, and more particularly to a transparent sound-insulating wall and a sound-insulating panel in which titanium dioxide particles containing brookite-type crystals exist on the surface and methods of manufacture thereof. Background technique [0002] In urban areas, in recent years, due to the consideration of sunlight rights, etc., soundproof walls and soundproof panels (hereinafter referred to as "transparent soundproof walls") made of high-transparency materials have been installed along roads and railways. In addition, due to the poor appearance of conventional opaque materials such as metal plates, they are not ideal materials, so they are also being replaced by transparent materials. Among such transparent materials, moldings of polycarbonate resin or acrylic resin among plastic materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/00B32B27/28B32B27/30B32B27/36C09D7/61E01F8/00G10K11/162
CPCB32B27/30C08K3/22B01J35/002E01F8/0017E01F8/0023G10K11/162B01J35/004B32B27/36C09D7/1216C09D5/1618B32B27/28C09D7/61G10K11/16
Inventor 大森将弘三林正幸
Owner SHOWA DENKO KK
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