JPH0999219A - Removing method of pollutant and traveling object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove a pollutant in the air by giving rear infrared ray to a photocatalyst fitted on the outside surface of a traveling object. SOLUTION: The powdery particles of the photocatalyst is fitted on the surface (outside surface) of the traveling object, for example, on the outside surface of the body 1 constituting an automobile 100 or the like, to remove the low concn. pollutant (nitrogen oxides or the like) in the environmental air. As one example of means to fit the photocatalyst, the photocatalyst incorporated in a coating material for the top coating of the outside plate surface of the body of the automobile 100 or the like is applied. The photocatalyst receiving near ultraviolet ray is activated to oxidize and decompose nitrogen oxides or the like. As a result, the pollutant in the air, e.g. the low concn. nitrogen oxides or the like is oxidized to be captured on the photocatalyst. And organic materials sticking to the outside plates 1-6 of the traveling object 100 or the like is removed without using a special device or manual aid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of using a photocatalyst, and more specifically, a method for removing low-concentration pollutants (nitrogen oxides) in the ambient air (International Patent Classification B01D5).
3/36) and a moving body provided with a photocatalyst on the outer plate surface (outer surface) of a body or the like.

[0002]

2. Description of the Related Art As a means for removing nitrogen oxides in the atmosphere, a sheet-like or panel-like member having a photocatalyst on its surface is arranged as a soundproof wall of a road.
It is proposed in Japanese Patent No. 315614.

Similarly, a toxic gas removing device in which a photocatalyst is supported on a thin blade-shaped reaction plate and the reaction plate is arranged in a blind manner in an air passage is disclosed in Japanese Patent Laid-Open No. 6-10813.
No. 8 proposes this.

By the way, when a moving body such as a hood, a door, a ceiling, a trunk, a trunk lid plate, etc., which constitutes an outer panel of a vehicle body is dirty, it is manually or automatically washed with water and a detergent.

[0005]

However, Japanese Patent Laid-Open No. 6-3
In the case proposed in Japanese Patent No. 15614, the soundproof walls arranged on both sides of the road are installed only in a limited range (region), and the operation area is limited. In addition, the soundproof wall is fixed and not mobile. Therefore, the area of action is also limited. Japanese Patent Laid-Open No. 6-108138 has the same problem.

It should be noted that dirt such as organic substances attached to the outer plate of a moving body such as an automobile is removed by washing and not automatically removed by a photocatalyst.

[0007]

In order to solve the above-mentioned problems, the method and moving body for removing low-concentration pollutants (nitrogen oxides, etc.) in the ambient atmosphere according to the present invention move the photocatalyst powder particles. The structure is provided on the surface (outer surface) of the body, for example, on the outer surface of a body (vehicle body) that constitutes an automobile or the like.

As an example of a specific means for providing the photocatalyst on the outer surface, the photocatalyst is contained in the top coat paint on the outer surface of the body of an automobile or the like.

As the top coating material, a thermosetting acrylic resin member (for example, acrylic melamine resin), alkyd melamine resin member, vinyl acetate resin, fluororesin resin, silicon resin resin, epoxy resin resin, or UV resin resin ( It is one of the organic binders such as UV curable resin).

As the photocatalyst contained in the paint, for example, any photocatalyst such as titanium dioxide or a mixture of titanium dioxide and activated carbon may be used.

The surface of the photocatalyst fixed on the surface of the moving body is
Initially, it is covered with the organic binder (acrylic resin paint or the like). However, the photocatalyst is 300nm-40
By receiving near-ultraviolet rays of 0 nm, the organic binder on the side receiving near-ultraviolet rays (the surface side in contact with the atmosphere) is decomposed and removed, and the photocatalyst is exposed. And it functions as a photocatalyst.

By disposing a thin film of a photocatalyst consisting of titanium dioxide or a mixture of titanium dioxide and activated carbon on the surface of the moving body, it is possible to prevent the surface of the moving body from being soiled, to kill bacteria on the surface, and to smell odors. take. It also removes low concentrations of pollutants (such as nitrogen oxides) in the ambient air.

That is, the sun or a fluorescent lamp is 300 nm to 40 nm.
The photocatalyst that receives near-ultraviolet rays of 0 nm is activated and oxidizes and decomposes organic substances (acetaldehyde, ammonia, etc.), nitrogen oxides, chlorine compounds, and the like.

The coating thickness of the topcoat paint containing the photocatalyst is set to a minimum of about 0.1 μm to 30 μm.

The blending ratio of the photocatalyst blended in the paint is 0.5 W
% To 20 W%, and the weight average particle diameter of the photocatalyst is set in the range of 0.01 μm to 5 μm.

The structure of the photocatalyst is, for example, JP-A-4-4.
Japanese Patent No. 5853 is proposed. Here, a highly active photocatalyst is formed by bringing a catalyst carrying a reducing catalytically active component and a photocatalyst carrying an oxidizing catalytically active component into contact with each other, and further contacting a water-repellent substance with one of them. doing.

As a specific example, a component having catalytic activity for reducing carbon dioxide gas such as copper or mercury is supported on a conductive carrier such as carbon black. Further, a component such as silver or platinum having a catalytic activity for the oxidative oxidation reaction of water is supported on a semiconductor such as titanium dioxide. Then, the two are brought into contact with each other, but recombination of charges is prevented because the active sites are separated. Further, since the water-repellent substance is brought into contact with any of them, the catalyst floats and is present on the surface layer of the aqueous solution to obtain a highly active photocatalyst.

The titanium alkoxide compound is dissolved in an equimolar amount of ethanol or the like, and hydrolyzed by adding hydrochloric acid or the like. The obtained titanium oxide can be formed into any shape without a binder.

The titanium dioxide is preferably anatase type, but it may be rutile type titanium dioxide metallized with copper, silver, platinum or other metal.

Further, W0 ↓ 2, CdS, SrTiO ↓
2, a semiconductor such as MoS ↓ 2 may be used to form the photocatalyst.

With the above-described structure, the present invention makes it possible to remove pollutants in the atmosphere, organic substances attached to the outer plate of the moving body, etc. without using a special device or manpower.

More specifically, by exposing the photocatalyst to near-ultraviolet rays such as sunlight outdoors or indoors, it is possible to oxidize low-concentration nitrogen oxides in the atmosphere into nitric acid or the like and capture them on the photocatalyst. As a result, a healthy and comfortable life is enabled. In addition, the environment can be improved.

The photocatalyst is covered with products such as nitric acid mainly on the active surface of the photocatalyst over time, and the ability to remove pollutants gradually decreases. However, the activity is recovered by washing away the products by precipitation or washing. To do.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The method for removing pollutants according to claim 1 of the present invention is characterized in that a photocatalyst is provided on the outer surface of a moving body, and pollutants in the atmosphere are removed by receiving near-ultraviolet rays. It has the function of oxidizing and decomposing pollutants in the air or organic substances (acetaldehyde, ammonia, etc.), nitrogen oxides, chlorine compounds, etc. adhering to the outer plate surface of the moving body. Furthermore, the traveling of the moving body increases the chances of contact with the pollutants, and the decomposition efficiency of the photocatalyst is improved.

Next, the method for removing contaminants according to claim 2 is the same as the method for removing contaminants according to claim 1.
It is characterized in that the type of moving body is any one of an automobile, a vehicle, a flying object, a ship, and a bicycle, and pollutants in the atmosphere or organic substances (acetaldehyde, Ammonia, etc.), nitrogen oxides, chlorine compounds, etc. are oxidized and decomposed.

Next, the method for removing contaminants according to claim 3 is the method for removing contaminants according to claim 1, wherein the photocatalyst is either titanium dioxide or a mixture of titanium dioxide and activated carbon. It is characterized by being used as a main component, and acts to oxidize and decompose pollutants in the air or organic substances (acetaldehyde, ammonia, etc.), nitrogen oxides, chlorine compounds, etc. adhering to the outer surface of the moving body. Have.

Next, the moving body according to claim 4 is characterized in that it is provided with a photocatalyst on its outer surface and removes pollutants in the atmosphere by receiving near-ultraviolet rays. Alternatively, it has a function of oxidizing and decomposing organic substances (acetaldehyde, ammonia, etc.), nitrogen oxides, chlorine compounds, etc. attached to the outer plate surface of the moving body.

Next, the moving body according to claim 5 is characterized in that a coating material containing a photocatalyst is applied to the outer surface, and by receiving near-ultraviolet rays, contaminants in the atmosphere and dirt on the surface are removed. And has an action of oxidizing and decomposing pollutants in the air or organic substances (acetaldehyde, ammonia, etc.), nitrogen oxides, chlorine compounds, etc. attached to the outer plate surface of the moving body.

Next, the moving body according to claim 6 is the moving body according to claim 5, wherein the photocatalyst is mainly composed of either titanium dioxide or a mixture of titanium dioxide and activated carbon. It has a function of oxidizing and decomposing pollutants in the atmosphere or organic substances (acetaldehyde, ammonia, etc.), nitrogen oxides, chlorine compounds, etc. adhering to the outer plate surface of the moving body.

Next, the moving body according to claim 7 is the moving body according to claim 5, wherein the coating material is an acrylic type, vinyl acetate type, fluororesin type, silicone resin type, epoxy resin type or urethane resin type. Or one of polyester resin type, phenol resin type or polyvinyl chloride type, which is a contaminant in the air or an organic matter (such as acetaldehyde or ammonia) attached to the outer plate surface of the moving body. ),
It has the function of oxidizing and decomposing nitrogen oxides and chlorine compounds.

Next, the moving body according to claim 8 is the moving body according to claim 5, wherein the outer surface is at least one of the body, the ceiling of the body, the hood, the trunk cover plate, and the door. It has a function of oxidizing and decomposing pollutants in the atmosphere or organic substances (acetaldehyde, ammonia, etc.), nitrogen oxides, chlorine compounds, etc. adhering to the outer plate surface of the moving body.

Next, the moving body according to claim 9 is characterized in that a sheet or panel having a photocatalyst on the surface is attached to the outer surface, and pollutants in the atmosphere or the outer plate of the moving body. It has the function of oxidizing and decomposing organic substances (acetaldehyde, ammonia, etc.), nitrogen oxides, chlorine compounds, etc. attached to the surface.

An embodiment of the present invention will be described below with reference to FIG. (Embodiment) FIG. 1 is an external perspective view of a moving body according to an embodiment of the present invention. A mobile body will be described as an example of the automobile 100. Reference numeral 1 denotes an automobile body, 2 a door, 3 a hood, 4 a rear trunk, and 5 a cover plate for the rear trunk.

The outer plate surface (outer surface) of each part of the automobile 100 is coated with a transparent color or a predetermined color tone.

As described above, as the top coating material, a thermosetting acrylic resin member (for example, acrylic melamine resin), alkyd melamine resin member, vinyl acetate resin, fluororesin resin, silicon resin resin, or epoxy resin resin is used. , Or urethane resin-based or polyester resin-based, phenolic resin-based, or polyvinyl chloride-based synthetic resin member (or organic binder)
One of the above.

As the photocatalyst contained in the paint, for example, any photocatalyst such as titanium dioxide or a mixture of titanium dioxide and activated carbon may be used.

The minimum coating thickness of the photocatalyst layer is about 0.3 μm to 10 μm.

The blending ratio of the photocatalyst to be blended in the top coat is 0.5 W% to 20 W%, and the weight average particle diameter of the photocatalyst is in the range of 0.01 μm to 5 μm.

In addition to the above paint, a method of using an epoxy paint may be used as a method for supporting the titanium dioxide particles. In this case, the titanium dioxide particles are impregnated with water, dispersed in a paint containing an epoxy resin, and then applied to the outer skin of each part of the automobile. Then, primary drying is performed at 30 to 50 degrees Celsius,
After evaporating the thinner, secondary drying is performed at 160 to 200 degrees Celsius to form a photocatalyst layer.

It goes without saying that any means such as dip coating, spray coating, electrostatic coating or powder coating may be used as the coating method.

Further, the UV resin may contain powder particles of photocatalyst and be applied to the outer surface of the moving body.

Further, titanium dioxide particles may be dispersed and applied to a portion corresponding to a pigment dispersion medium, that is, a portion corresponding to a transparent coating (vehicle).

Further, as a moving body, an automobile (single vehicle,
It may be any vehicle such as a tricycle, a four-wheel vehicle, a bus, etc.), a railway vehicle, a flying object such as an aircraft, a ship, or a bicycle.

Further, in addition to using a paint as a means for supporting the photocatalyst on the outer surface of the moving body, it may be fixed by using an organic adhesive or a water-soluble adhesive. Of course, a sheet or panel having a photocatalyst on the surface may be arranged on the outer surface of the moving body as in the conventional case.

[0045]

INDUSTRIAL APPLICABILITY As described above, the pollutant removing method and the moving body according to the present invention can oxidize pollutants in the air, such as low-concentration nitrogen oxides, into nitric acid or the like and capture them on the photocatalyst. Further, it becomes possible to remove the organic substances and the like attached to the outer plate of the moving body without using a special device or manpower.

Further, the traveling of the moving body increases the chances of contact with pollutants, and the decomposition efficiency of the photocatalyst is improved.

Further, it is not necessary to separately manufacture and install a sheet or panel provided with a photocatalyst, a blind type toxic gas removing device, and the like. A photocatalyst can be provided in the process of applying a coating to a moving body such as a car body. Of course, the space for installing sheets, panels, blind-type toxic gas removing devices, etc. is also unnecessary.

[Brief description of drawings]

FIG. 1 is an external perspective view of a moving body according to an embodiment of the present invention.

[Explanation of symbols]

 1 body 2 door 3 bonnet 4 trunk 5 lid plate 6 ceiling 100 automobile

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B64C 1/00 ZAB B64C 1/00 ZABB

Claims (9)

[Claims] 1. A method for removing pollutants, comprising a photocatalyst on the outer surface of a moving body, and removing pollutants in the atmosphere by receiving near-ultraviolet rays. 2. The method for removing contaminants according to claim 1, wherein the moving body is one of an automobile, a vehicle, a flying object, a ship, and a bicycle. 3. The method for removing pollutants according to claim 1, wherein the photocatalyst is mainly composed of either titanium dioxide or a mixture of titanium dioxide and activated carbon. 4. A moving body comprising a photocatalyst on an outer surface thereof, and removing pollutants in the atmosphere by receiving near-ultraviolet rays. 5. A moving body, characterized in that a coating material containing a photocatalyst is applied to the outer surface, and by receiving near-ultraviolet rays, contaminants in the air and dirt on the surface are removed. 6. The moving body according to claim 5, wherein the photocatalyst is mainly composed of either titanium dioxide or a mixture of titanium dioxide and activated carbon. 7. The coating material is any one of acrylic type, vinyl acetate type, fluororesin type, silicone resin type, epoxy resin type, urethane resin type, polyester resin type, phenol resin type, and polyvinyl chloride type. The moving body according to claim 5, wherein: 8. The moving body according to claim 5, wherein the outer surface is at least one of a body, a ceiling, a hood, a trunk cover plate, and a door. 9. A moving body, characterized in that either one of a sheet or a panel having a photocatalyst on the surface is attached to the outer surface.