JP2991096B2 - Bottomed container with photocatalyst and molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for utilizing a photocatalyst, and more particularly to a method for decomposing organic substances (acetaldehyde, ammonia, scale, etc.) attached to a surface of a vessel such as a bathtub or a cooler box for fishing. Action,
The present invention relates to a bottomed container having a sterilizing action and a deodorizing action.

[0002]

2. Description of the Related Art As means for circulating and purifying hot water in a bathtub by means of a pump, for example, there has been proposed an apparatus for sterilizing with hot water in the middle of a hot water circulation path. Further, a water purification device in which a light source that emits ultraviolet light and a photocatalyst are disposed in the middle of a circulation path of hot water has been proposed in Japanese Patent Application Laid-Open No. 6-218393.

Further, when organic substances (acetaldehyde, ammonia, dirt, etc.) adhere to the surface of a bathtub or a cooler box and become dirty or smell odorous, they are manually washed with water and a detergent.

[0004]

However, in the above-mentioned method, dirt and odors such as organic substances adhered to the surface of the bottomed container are removed by washing, and are not automatically removed by the photocatalyst. Further, in the case proposed in JP-A-6-218393, dirt adhering to the surface of the bathtub is not decomposed or removed.

[0005] The present invention is intended to decompose and sterilize organic substances (acetaldehyde, ammonia, dirt, etc.) attached to the surface.
An object is to provide a bottomed container having a deodorizing action.

[0006]

Means for Solving the Problems To solve the above problems, the bottomed container of the present invention has a structure in which powder particles of a photocatalyst are provided on the surface of the bottomed container. It is characterized by removing pollutants and odors.

As an example of specific means for providing a photocatalyst on the surface, an adhesive containing a photocatalyst is applied to the surface of a bottomed container.

As another means, in a process of molding a bottomed container such as a bathtub or a cooler box, for example, in an injection molding process, powder particles of a photocatalyst are arranged on the surface of an injection material such as a resin member. .

As an adhesive containing a photocatalyst, a thermosetting acrylic resin member (for example, acrylic melamine resin)
Or an alkyd melamine resin member, or an organic binder such as vinyl acetate, a fluorine resin, a silicon resin, an epoxy resin, or a UV resin (ultraviolet curable resin).

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

[0011] The surface of the photocatalyst fixed to the surface of the bottomed container is initially covered with the organic binder (acrylic resin adhesive or the like). However, the photocatalyst is 300n
By receiving near-ultraviolet light of m to 400 nm, the organic binder on the side receiving the near-ultraviolet light (the surface side in contact with the atmosphere) is decomposed and removed, exposing the photocatalyst. And it functions as a photocatalyst.

By disposing a photocatalyst made of titanium dioxide or a mixture of titanium dioxide and activated carbon on the surface of the bottomed container, the surface can be prevented from being stained, bacteria on the surface can be killed, and the smell smeared can be removed.

That is, the photocatalyst which has received near-ultraviolet light of 300 nm to 400 nm from the sun, a fluorescent lamp or an ultraviolet lamp is activated to oxidize and decompose organic substances (acetaldehyde, ammonia, etc.), nitrogen oxides, chlorine compounds and the like.

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

The mixing ratio of the photocatalyst to be mixed with the adhesive is 0.5
W% to 20 W%, and the weight average particle size of the photocatalyst is 0.01%.
The range is from micron meter to 10 micrometer.

The structure of the photocatalyst is described in, for example,
No. 5853 has been 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 the reduction reaction of carbon dioxide such as copper and mercury is supported on a conductive carrier such as carbon black. A component such as silver or platinum having a catalytic activity for oxidizing and oxidizing 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 an anatase type, but may be a rutile type titanium dioxide metallized with copper, silver, platinum or other metals.

W0 ↓ 2, CdS, SrTiO ↓
2, a photocatalyst may be formed of a semiconductor such as MoS ↓ 2.

According to the present invention, with the above-described structure, it is possible to remove organic substances, odors and the like adhering to the surface of the bottomed container without using a special device or manual operation.

That is, when the photocatalyst is exposed to near-ultraviolet rays such as sunlight or fluorescent light, organic substances and nitrogen oxides can be oxidized and captured on the photocatalyst. as a result,
Enable a healthy and comfortable life. In addition, the environment can be improved.

As time passes, the photocatalyst mainly covers the active portion of the surface with the product, and the ability to remove contaminants gradually decreases. However, the activity is restored by washing the product with water or hot water itself. .

[0024]

[0025]

Next, a first aspect of the present invention is a bottomed container provided with a photocatalyst, wherein an adhesive containing the photocatalyst is applied to the surface of the container. It has an effect of oxidizing and decomposing contaminants such as (acetaldehyde and ammonia), nitrogen oxides and chlorine compounds.

Next, a second aspect of the present invention is that the adhesive is made of acrylic, vinyl acetate, fluorine resin, silicone resin, epoxy resin, urethane resin, polyester resin, phenol resin, or polyvinyl chloride. 4. A container with a bottom provided with the photocatalyst according to claim 3, wherein the container has an organic substance (acetaldehyde, ammonia, etc.), nitrogen oxide, chlorine, etc. attached to the surface of the container. It has the effect of oxidizing and decomposing contaminants such as compounds.

Next, a third aspect of the present invention is a bottomed container provided with a photocatalyst, wherein a photocatalyst is embedded in the surface of the container, and an organic substance (such as acetaldehyde or ammonia) adhered to the surface of the container. ), Has the effect of oxidizing and decomposing contaminants such as nitrogen oxides and chlorine compounds.

Next, according to a fourth aspect of the present invention, a pair of molds including a movable mold and a fixed mold is prepared, a molding material is supplied to a cavity of the mold, and then the movable mold is retracted. A method for molding a bottomed container equipped with a photocatalyst characterized by providing a void portion and providing a photocatalyst on the surface of the bottomed container by supplying a gas containing a photocatalyst to the void portion, The coating layer of the photocatalyst can be formed in the process of injection molding, and the work for forming the coating layer is not required. Therefore, the process is simplified and the cost can be reduced.

Next, a fifth invention is a method for forming a bottomed container provided with a photocatalyst according to the fourth invention , characterized in that the gas contains an adhesive. Has the effect that it can be secured on the surface of the bottomed container.

Next, according to a sixth aspect of the present invention, a pair of molds including a movable mold and a fixed mold is prepared, a molding material is supplied to a cavity of the mold, and then the movable mold is retracted. Forming a void portion, supplying a photocatalyst to the void portion, and further pressing the photocatalyst by advancing the movable mold to bury the photocatalyst in the vicinity of the surface of the bottomed container. It is a method of forming a bottomed container with
The coating layer of the photocatalyst can be formed in the process of injection molding, and the work for forming the coating layer is not required. Therefore, the process is simplified and the cost can be reduced.

Hereinafter, the bottomed container according to the embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

(Embodiment 1) FIG. 1 is a plan view of a bathtub 1 (bottomed container) according to Embodiment 1 of the present invention. FIG.
1 shows a longitudinal sectional view of FIG. 1 cut along cutting lines S1 to S1.

As shown in FIGS. 1 and 2, the bathtub 1 of the present invention has a substantially U-shaped bottomed container shape, and has a flange portion 2 provided around the upper end side. Further, the water supply ports 3, 4 and the drain port 5 are provided on the side wall and the bottom surface as needed. In the case of a bathtub for infants, the water supply ports 3 and 4 and the drainage port 5 are often not provided.

The bathtub 1 may be made of any material such as a stone, a stainless steel, or a resin such as acrylic, polycarbonate, vinyl chloride, or epoxy. The shape may be arbitrarily set.

The bathtub 1 is provided with photocatalyst powder particles on the surface, that is, at least one of the outer surface and the inner surface of the bathtub. In the embodiment of FIG. 1, the bath is provided with a photocatalyst only on the inner surface and the flange.

The first means for providing a photocatalyst on the inner surface of the bathtub 1 is to apply an adhesive containing the photocatalyst to the surface of the bathtub.

As described above, the adhesive containing the photocatalyst is a thermosetting acrylic resin member (for example, acrylic melamine resin), an alkyd melamine resin member, a vinyl acetate resin, a fluorine resin resin, a silicon resin resin, or It is made of any one of a synthetic resin member (or an organic binder) such as a urethane resin type, a polyester resin type, a phenol resin type, and a polyvinyl chloride type.

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

The coating thickness of the photocatalyst layer is at least about 0.3 μm to 30 μm.

The mixing ratio of the photocatalyst to be mixed with the adhesive is 0.5
W% to 20 W%, and the weight average particle size of the photocatalyst is 0.01%.
The range is from micron meter to 10 micrometer.

In addition to the above-mentioned adhesive, a method using an epoxy resin-based adhesive may be used as a method for supporting titanium dioxide particles. In this case, the titanium dioxide particles are impregnated with water, dispersed in an adhesive containing an epoxy resin, and then applied to the surface of a bathtub constituting an envelope. And 30 degrees Celsius ~
After primary drying at 50 degrees and evaporating the thinner, 8 degrees Celsius
The secondary drying is performed at 0 to 200 degrees to form a photocatalyst layer.

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

The same applies to the case where the titanium dioxide particles may be dispersed and applied to a portion corresponding to a pigment dispersion medium, that is, a portion (vehicle) corresponding to a transparent adhesive.

Further, in addition to using the above-mentioned adhesive as a means for supporting the photocatalyst on the surface of the bathtub, the bath may be fixed using an organic adhesive or a water-soluble adhesive. The UV resin may contain powder particles of the photocatalyst and be applied to the surface of the bathtub.

In the case of a baby bathtub (bathtub), it is desirable to provide a photocatalyst on the entire surface of the bathtub.

Further, as a second means for providing a photocatalyst on the inner surface of the bathtub 1, as shown in FIG. 5, a method of applying or embedding powder particles of the photocatalyst on the surface of a molded article in the process of injection molding is used. Good.

FIG. 5 is a sectional view of a main part showing the concept of the injection molding apparatus. In FIG. 5, after a resin for forming a bathtub is injected into a cavity of a pair of molds including a fixed mold 122 and a movable mold 123, The movable mold 123 is retracted by a small amount (δ = several tens μm to several hundreds of μm) to a position indicated by a two-dot chain line to provide a gap on the side constituting the inner surface of the bathtub. The gas containing the photocatalyst powder particles is injected from the photocatalyst injection device 41D into the gap to form a photocatalyst coating layer on the outer surface of the bathtub (not shown).

The particle diameter of the powder of the photocatalyst contained in the gas is 0.3.
The range is from 01 micrometer to 100 micrometer.

The timing of injecting the gas containing the photocatalyst into the inner surface of the gap is arbitrarily set. For example, when a gas containing powder particles of a photocatalyst is injected, the injection is performed before the resin in the mold cavity is cooled and solidified.

As a matter of course, a gas containing a photocatalyst may be injected after the resin is cooled and solidified. In this case, a binder, an adhesive resin, a diluting solvent, or the like may be included in the gas so that the photocatalyst does not peel off from the adhesion surface.

When the high-pressure gas containing the photocatalyst does not contain the binder, the adhesive resin, or the diluting solvent, after the injection, the retreated mold is advanced again to press the photocatalyst-coated surface, and the photocatalyst layer is pressed. It may be embedded in the surface of the molded article or in the vicinity of the surface.

Further, the nozzle for injecting the photocatalyst is not limited to one location, but may be arbitrarily provided at a plurality of locations. As the solvent, any solvent such as alcohol, toluene, thinner, and acetone, and as the adhesive, epoxy resin, acrylic resin, vinyl chloride resin, ABS resin, PS resin, polyamide resin, polycarbonate resin, styrene resin, etc. A predetermined amount of any resin member may be included.

Further, as an injection-moldable member constituting a molded product (bath), other than the above-described members, the present invention may be arbitrarily implemented.
For example, a resin member such as ABS, PS, PP, PE, PET, epoxy, or styrene foam may be used. Of course, it may be a biodegradable plastic. For example, a denatured protein member such as gluten, a member obtained by kneading paper and denatured protein, a member obtained by kneading cellulose and denatured protein constituting paper, an agar member, a member obtained by kneading potato starch with water, a natural polymer Novamont (Trade name: Matterby / Nippon Synthetic Chemical Industry), microbial polyester I
CI (trade name: Biopol / ICI Japan), chemically synthesized aliphatic polyester (trade name: Bionole / Showa Kobunshi), etc. may be used arbitrarily.

According to the present invention, the characteristics of the resin member used for injection molding are not changed by the above configuration. For example,
An arbitrary structure or a curved surface shape can be configured according to the variety of designs and the purpose of use without changing the molding characteristics of the resin member. Further, the quality of the molded product does not deteriorate.

Further, a coating layer of the photocatalyst can be formed in the process of injection molding, and the work for forming the coating layer is not required. Therefore, the process can be simplified and the cost can be reduced.

The photocatalyst provided on the surface of the bathtub is activated by receiving near-ultraviolet light of 300 nm to 400 nm such as the sun, a fluorescent lamp or an ultraviolet lamp, and is activated by organic substances (acetaldehyde, ammonia, dirt, etc.), nitrogen oxides and chlorine compounds. Oxidize and decompose.

The structure of the photocatalyst is described in, for example,
No. 5853 has been proposed. Here, a highly active photocatalyst is formed by bringing a catalyst carrying a reducing catalytically active carbon component and a photocatalyst carrying an oxidizing catalytically active carbon 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 the reduction reaction of carbon dioxide such as copper and mercury is supported on a conductive carrier such as carbon black. In addition, a component such as silver or platinum having a catalytic activity for oxidizing 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 far from each other. 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.

As the pressure fluid, other than compressed air, any gas such as nitrogen gas or inert gas (eg, argon gas) may be used.

As described above, the bathtub (bottomed container) according to the first embodiment of the present invention can remove organic substances, odors, and the like adhering to the surface without using a special device or manual operation.

(Embodiment 2) FIG. 4 is a longitudinal sectional view of a cooler box 31 according to Embodiment 2 of the present invention.

FIG. 3 is an external perspective view of the cooler box 31. In FIG. 4, reference numeral 32 which constitutes a main part indicates a heat insulating container (bottomed container), and 33 indicates a lid.

The heat insulating container 32 (bottomed container) has a structure in which photocatalyst powder particles are provided on at least one of the surface, that is, the outer surface and the inner surface. In the embodiment of FIG. 4, a photocatalyst is provided on both the inner surface and the outer surface.

The first means for providing a photocatalyst on the surface of the heat insulating container 32 is to apply an adhesive containing the photocatalyst.

Embodiment 1 as an adhesive containing a photocatalyst
As described in, a thermosetting acrylic resin member (for example, acrylic melamine resin) or an alkyd melamine resin member, or vinyl acetate, or a fluorine resin, or a silicone resin, or a urethane resin or a polyester resin, or It is made of any one of a synthetic resin member (or an organic binder) of a phenol resin type, a polyvinyl chloride type, or an epoxy resin type.

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

The minimum thickness of the photocatalyst layer is about 0.3 μm to 30 μm.

The mixing ratio of the photocatalyst to be mixed with the adhesive is 0.5
W% to 20 W%, and the weight average particle size of the photocatalyst is 0.01%.
The range is from micron meter to 100 micron meter.

These structures are the same as in the first embodiment, and the same applies to the action of the photocatalyst.

That is, the photocatalyst provided on the surface of the heat insulating container 32 is activated by receiving near-ultraviolet light of 300 nm to 400 nm such as the sun or a fluorescent lamp, and the odor or pollutant such as an organic substance (acetaldehyde) attached to the surface of the heat insulating container 32 And ammonia), nitrogen oxides, chlorine compounds, etc., by oxidizing, decomposing and removing.

Further, as a second means for providing a photocatalyst on the inner surface of the heat insulating container 32, as shown in FIG. 5, powder particles of the photocatalyst are applied or buried on the inner surface of a molded article (cooler box) in the process of injection molding. Is used. Since the molding method has been described in the first embodiment, repeated description will be avoided.

It is needless to say that a photocatalyst is also provided on the surface (inner surface and outer surface) of the lid 33 constituting the cooler box.

A cooler box provided with a photocatalyst is activated by receiving near ultraviolet rays of 300 nm to 400 nm such as the sun and a fluorescent lamp, and emits offensive odors or pollutants such as organic substances (acetaldehyde, ammonia, etc.) attached to the surface of the heat insulating container or the lid. Oxidizes, decomposes and removes nitrogen oxides and chlorine compounds.

It is needless to say that the bottomed container may have any shape and any container other than the above-mentioned bathtub or heat insulating container (cooler box for fishing etc.). For example, tableware and various cooking utensils may be used. Moreover, it is good also as a bottomed container used as an ashtray etc. for the purpose of removing a bad smell by itself.

[0077]

As described above, the bottomed container of the present invention oxidizes odors or pollutants such as organic substances and nitrogen oxides attached to the surface and captures them on the photocatalyst without using any special equipment or manual operation. It can be removed.

[Brief description of the drawings]

FIG. 1 is a plan view of a bathtub according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view of FIG. 1 taken along cutting lines S1 to S1.

FIG. 3 is an external perspective view of a cooler box according to Embodiment 2 of the present invention.

FIG. 4 is a longitudinal sectional view of FIG. 3;

FIG. 5 is a sectional view of a main part of a molding apparatus used for molding the first and second embodiments of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bathtub 2 Flange part 3, 4 Water supply port 5 Drainage port 10 Photocatalyst 31 Cooler box 32 Insulated container 33 Lid 41D Photocatalyst injection device 121 Molded product 122 Fixed type 123 Movable type 124 Cylinder 150 Mold

Claims (3)

(57) [Claims] 1. A pair of molds comprising a movable mold and a fixed mold are prepared, a molding material is supplied to a cavity of the mold, and thereafter, the movable mold is retracted to provide a gap. A method for forming a bottomed container provided with a photocatalyst, wherein the photocatalyst is disposed on the surface of the bottomed container by supplying a gas containing the photocatalyst to the portion. 2. The method for forming a bottomed container provided with a photocatalyst according to claim 1, wherein the gas contains an adhesive. 3. A pair of molds comprising a movable mold and a fixed mold is prepared, a molding material is supplied to a cavity of the mold, and thereafter, the movable mold is retracted to form a void. A photocatalyst is supplied to the void portion, and furthermore, a bottomed container equipped with a photocatalyst characterized in that the photocatalyst is pressed and buried near the surface of the bottomed container by advancing the movable mold. Molding method.