JP3445999B2 - Photocatalyst cloth - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photocatalyst cloth, and more particularly, it can be formed into an arbitrary shape and can be held, and decomposes a bad odor, a harmful chemical substance, dirt, etc. by receiving light. The present invention relates to a photocatalytic cloth that can be manufactured.

[0002]

2. Description of the Related Art In recent years, pollution of the indoor environment due to bad odors and harmful chemical substances has become a problem as sick house syndrome, and dirt that adheres little by little to the room or the light source every day becomes a problem.

It is known that when titanium oxide is irradiated with light, electrons having a strong reducing action and holes having a strong oxidizing action are generated, and molecular species in contact with titanium oxide are decomposed by the redox action. By utilizing such an action of titanium oxide, that is, a photocatalytic action, malodorous substances, harmful chemical substances and dirt in the air can be easily decomposed and removed, and can be used semipermanently.

Heretofore, as a fiber exhibiting such a photocatalytic action, a glass fiber coated with titanium oxide has been known. This is because the light from a fluorescent lamp or the like is received by the titanium oxide on the fiber surface, and the redox effect of the electrons and holes generated decomposes and removes malodorous substances and dirt in the air.

However, since this fiber is difficult to mold, it has a drawback that its application range is narrow.

[0006]

Therefore, in view of the above-mentioned drawbacks, the object of the present invention is to excellently purify the environment by decomposing a foul odor, a harmful chemical substance, a dirt, or the like by receiving light, and a shape. It is to provide a photocatalytic cloth that can be arbitrarily changed and can retain its shape.

In order to achieve the above object, the inventor of the present invention has conducted extensive studies and found that fibers composed of metal wires and glass wires were coated with a resin containing titanium oxide, for example, Teflon (tetrafluoroethylene resin). -By coating (covering),
You can change the shape arbitrarily, you can keep the shape,
It has excellent durability and heat resistance, and it has the effect of effectively decomposing malodorous substances, harmful chemical substances, dirt, etc. by purifying the environment by the redox action of electrons and holes generated in titanium oxide by receiving light. The inventors have found that they can be obtained and have completed the present invention.

[0008]

In order to achieve the above-mentioned object, the invention of claim 1 is characterized in that a fiber comprising a metal wire and a glass wire is coated with a resin containing titanium oxide. It is a photocatalytic cloth.

In the invention of claim 1, the metal wire forming the photocatalytic cloth is copper, silver, zinc, iron, aluminum,
Examples include various metals such as titanium and nickel, alloys thereof, stainless steel, nichrome, shape memory alloys, and the like. The glass wire may be made of glass fiber. That is, examples of the material of the glass wire include quartz glass, hard glass, soft glass, metal oxide glass such as silica-alumina, alumina, titania, zirconia, and mullite, fused quartz, and rock wool.
From the economical aspect, soft glass wire is preferable. The thickness of the metal wire or the glass wire forming the photocatalytic cloth is preferably thinner so that it is easier to handle, but is not limited to the thin wire. For example, the metal wire preferably has a thickness of 1 μm to 3.0 mm, and the glass wire preferably has a thickness of 1 μm to 3.0 mm.

As the cloth, a cloth obtained by weaving single fibers of metal wire and glass wire can be used. The metal wire and the glass wire may be pre-twisted wires and may be woven cloth. The weaving method is not limited. The ratio of the metal wire to the glass wire can be selected depending on the application. Further, the composition of the metal wire for forming the cloth is determined so that the cloth can retain its shape.
The metal wire may be used for either the warp yarn or the weft yarn, or may be used for both. The same applies to glass wires. The ratio of metal wire and glass wire can be selected according to the application,
Generally, when the size of the cloth is large, it is desirable that the ratio of the metal wires is small, and conversely, when the size of the cloth is small, the ratio of the metal wires is desirable.

The titanium oxide mentioned above may be used alone,
It may be a surface on which a precious metal such as platinum or a ceramic having no photocatalytic action such as silica, alumina or apatite is supported. The crystal form of titanium oxide may be rutile or brookite, but anatase is preferred from the viewpoint of activity. The compounding ratio of titanium oxide to resin is 1
The range of ˜60 wt% is preferred. If it is less than 1 wt%, it has no effect, and if it exceeds 60 wt%, it is difficult to form a sheet.

The resin used in the photocatalyst cloth of the present invention is polyester, polyethylene, polypropylene, nylon, ABS resin, urethane resin, epoxy resin, P
Examples include ET resin, vinyl chloride resin, epoxy resin, silicone resin, fluororesin, vinyl acetate resin, vinylidene chloride resin, rubber, glue, and their copolymers. From the viewpoint of heat resistance and durability, fluororesin is used. Is most preferred.

The fluororesin is tetrafluoroethylene resin (PTFE, usually also called Teflon), tetrafluoroethylene / hexafluoropropylene copolymer (FEP), tetrafluoroethylene / perfluoroalkylvinyl ether. A fluorinated resin such as a tercopolymer (PFA) or a tetrafluoroethylene / ethylene copolymer (ETFE) can be used.

The photocatalyst cloth according to the present invention is a resin in which titanium oxide powder is kneaded, which covers the entire surface of a fiber composed of a metal wire and a glass wire, or a resin which is soaked in a fiber composed of a metal wire and a glass wire. After injecting it, titanium oxide powder is pressed into the surface, titanium oxide sol is applied, PV
It is manufactured by vapor-depositing titanium oxide by the D method or the CVD method. When the resin is a fluororesin, a preparation liquid in which titanium oxide powder is dispersed in an emulsion of a fluororesin is used, and the surface of the fiber composed of the metal wire and the glass wire is dipped, brushed, or rolled. It is prepared by baking after applying it by an appropriate means such as a lucoating method. At this time, the content of titanium oxide is preferably 1 to 60 wt% with respect to the resin, and the content is preferably large on the surface of the cloth and small on the inside in terms of photocatalytic activity.

Titanium oxide (powder) contained in the resin coat layer produces electrons and holes when receiving light to cause a redox action, and decomposes malodorous components, harmful chemical substances, dirt and the like. Light for causing the redox effect of titanium oxide is not limited to fluorescent lamps, but also sunlight, incandescent lamps, black light,
Various light sources such as a UV lamp, a mercury lamp, a xenon lamp, a halogen lamp, a metal halide lamp, a light emitting diode, and a semiconductor laser can be used.
In this case, it is better to use a light source that contains a lot of short wavelength light.
It is highly effective in preventing dirt, removing harmful substances, and deodorizing.
When the metal wire is energized and heated, the photocatalytic action can be promoted.

The photocatalyst cloth according to the first aspect is made of a metal wire, a glass wire, and a resin containing titanium oxide (powder) as a material, so that it is easy to manufacture. Similarly, the photocatalyst cloth according to claim 2 has heat resistance (for example, 250 ° C.) and durability because the fluorocarbon resin containing titanium oxide is used as the coating material.

When the photocatalyst cloth is applied to a room to be cleaned, this room can be cleaned. The photocatalytic cloth can be applied to other fields such as water treatment, antibacterial and antifungal, in addition to air purification. Further, this photocatalytic cloth is convenient because its shape can be arbitrarily changed, its shape can be retained, and it can be repeatedly used.

The photocatalytic cloth can be colored.
The coloring is not limited to white, and may be a bright color such as red, blue or yellow, or a pattern such as a flower pattern or logo.

In order to achieve the above object, the invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the metal wire is made of a shape memory alloy.

In the third aspect of the invention, the metal wire of the shape memory alloy may have various preset temperatures according to its use. It is convenient for the photocatalyst cloth using the metal wire of shape memory alloy to change the shape of the cloth to a preset shape at a predetermined atmospheric temperature.

The photocatalytic cloth is useful for decomposing smoke, dust, odors, harmful chemical substances and the like in the room where the photocatalytic cloth is arranged to purify the air. The photocatalyst cloth can be used for, for example, a bulb cover of an electric lamp to purify indoor air.

A fourth aspect of the present invention for achieving the above object.
The invention of claim 1 is characterized in that, in the invention of claim 1, claim 2 or claim 3, the titanium oxide is a crystal form of anatase.

In the invention of claim 4, titanium oxide (powder) having a crystal form of anatase is preferable because it has a large photocatalytic action.

[0024]

DETAILED DESCRIPTION OF THE INVENTION

[First Embodiment] First, a cloth and a treatment liquid are prepared. As shown in FIGS. 1 and 2, the cloth 1 has a structure in which a glass wire (using quartz glass wire) 2 and a copper wire 3 are woven, and the treatment liquid (not shown) is a tetrafluoroethylene resin ( It is prepared by dispersing anatase-type titanium oxide powder in a Teflon emulsion.

The cloth 1 is dipped in the treatment liquid, dried, and 2
Baking at 00 ° C., dipping, drying, and baking are repeated, and as shown in FIG. 3, a cloth 1 provided with a fluororesin coat layer 5 containing 50% of titanium oxide 4 powder, that is, a photocatalytic cloth. Get 6. Powder of titanium oxide 4 is mixed in the coat layer 5 of the photocatalyst cloth 6. Since the photocatalytic cloth 6 is woven with the copper wire 3, the photocatalytic cloth 6 can be bent into a predetermined shape and kept as it is.

The photocatalyst cloth 6 is appropriately molded and processed,
The cover of the straight tubular fluorescent lamp 7 shown in FIG. 3, that is, the tube cover 8 was used. This bulb cover 8 is white due to the powder of titanium oxide 4.

The stain decomposing effect of the obtained bulb cover 8 was examined as follows. First, the bulb cover 8 was attached to the surface of a 20 W straight tubular fluorescent lamp, and smoke of cigarette was blown to change the color to brown. This was set in the socket and the fluorescent lamp was turned on. As a result, the color of the tube cover 8 gradually became white, and returned to the original white color after 8 hours.

Therefore, as shown in FIG. 5, this tube cover 8 can be installed as the tube cover 8 of the fluorescent lamp 7 and turned on to decompose the smoke in the room. As shown in FIG. 5, the bulb cover 8 is attached to the fluorescent lamp 7 so as to cover the fluorescent lamp 7 to prevent the fluorescent lamp 7 from becoming dirty and dark due to cigarette smoke.

[0029]

[Second Embodiment] In advance, a cloth and a treatment liquid are prepared. As shown in FIGS. 6 and 7, the cloth 11 has a structure in which a glass wire (using a hard glass wire) 2 and a shape memory alloy wire 12 are woven. A metal wire may be appropriately woven into the cloth 11. The processing liquid (not shown)
Is prepared by dispersing anatase-type titanium oxide powder in an emulsion of tetrafluoroethylene resin.

The cloth 11 is coated with the treatment liquid and dried,
Baking at 200 ° C., repeating this, as shown in FIG.
Fluororesin core containing 40% of titanium oxide 4 powder
The cloth 11 provided with the coating layer 13, that is, the photocatalytic cloth 14 is obtained.

The coat layer 13 of the photocatalyst cloth 14 is mixed with titanium oxide 4 powder. This photocatalyst cloth 14
The shape memory alloy wire 12 is mixed and woven, and the shape memory alloy wire 12 can be bent into a predetermined shape to hold the shape.

The photocatalyst cloth 14 having the structure shown in FIG. 8 was molded into a bulb cover 16 shown in FIG. 9 for a spherical incandescent lamp 15. As shown in FIG. 10, the tube cover 16 has a predetermined width L on the outer periphery of the opening 16A of the tube cover 16 which serves as a notch 17 formed by cutting the cross 14 into a sawtooth shape, and the notch. As shown in FIG. 11, each shape memory alloy wire 12 arranged between the 17 has a set temperature (for example, a set temperature of 150 ° C.) of the heat of the incandescent lamp 15 at a predetermined width L on the wrapped incandescent lamp 15 side.
It is set so as to bend (see the bending portion 12A of the shape memory alloy wire 12 in FIG. 11).

As shown in FIG. 12, when the bulb cover 16 shown in FIG. 9 covers the incandescent lamp 15 and is turned on, the predetermined width L on the side of the opening 16A is bent at the set temperature, and the opening 16 is opened.
Because the diameter of A is small, the tube cover -1
The coating state of 6 can be kept good.

The stain decomposing effect of this tube cover 16 was examined as follows. First, 1 g of salad oil was thinly applied to the bulb cover 16 and the weight was measured, and then the bulb cover 16 was attached to the surface of a 100 W incandescent lamp and set in a socket to turn on the incandescent lamp. After 8 hours, the bulb cover 16 of the electric lamp was removed and the weight was measured. As a result, the weight was reduced by 0.9 g, and the salad oil was decomposed.

Therefore, this tube cover 16 is shown in FIG.
2, the incandescent lamp 15 can be attached as a cover and turned on to decompose the dirt component of oil in the room.

[0036]

[Third Embodiment] 0.1 m thick made of PET resin
Titanium oxide sol was applied to one surface of the m sheet by a roll coating method. Two sheets of this sheet were pasted together with the coated surface of titanium oxide facing outward, and a fiber cloth made of a stainless wire and a soft glass wire with a diameter of 0.1 mm was inserted between them and pressure was applied while heating. Figures 1-3
A photocatalytic cloth similar to that shown in was prepared. This was cut into 10 cm × 10 cm to produce a cylinder similar to that shown in FIG.

This cylinder was placed in a quartz glass closed container having an internal volume of 8 liters, 50 ppm of acetic acid as a malodorous substance was injected, and a 100 W mercury lamp was irradiated from the outside. After 1 hour, the concentration of acetic acid contained in the air in the closed container was examined by gas chromatography, and as a result, it was reduced to 1/10. When the cloth containing no titanium oxide was used, the reduction was only 10%.

[0038]

According to the first aspect of the present invention, the environment can be purified by degrading offensive odors, harmful chemical substances, dirt and the like by irradiation of light. Since this action is due to the photocatalyst, it is safe and the above effect has durability.

According to the second aspect of the invention, the material is mainly made of a fluororesin and an inorganic substance, so that it is excellent in heat resistance.

According to the third aspect of the present invention, the shape of the photocatalytic cloth can be changed at a predetermined set temperature of the metal wire of the shape memory alloy in the atmosphere in which the photocatalytic cloth is applied.

According to the invention of claim 4, since the titanium oxide of the coat layer uses the anatase type crystal, the photocatalytic action can be made more effective.

[Brief description of drawings]

FIG. 1 is a schematic view showing a part of a cloth according to a first embodiment.

FIG. 2 is an enlarged schematic view showing a state of arrangement of fiber tissues in the cloth of FIG.

FIG. 3 is an enlarged structural view of a photocatalytic cloth.

FIG. 4 is a perspective view of a straight tube fluorescent lamp and its bulb cover.

FIG. 5 is a view showing a usage state of a tube cover.

FIG. 6 is a schematic view showing a part of the cloth according to the second embodiment.

FIG. 7 is an enlarged schematic view showing a state of arrangement of fiber tissues in the cloth of FIG.

FIG. 8 is an enlarged structural view of a photocatalytic cloth.

FIG. 9 is a shape view of a tube cover.

FIG. 10 is an enlarged view showing an end portion of a tube cover in which a coat layer is omitted.

FIG. 11 is an explanatory view of the action of the shape memory alloy wire.

FIG. 12 is a view showing how the tube cover is used.

[Explanation of symbols]

1,11 cross 2 glass wire 3 copper wire 4 Titanium oxide 5,13 coat layer 6,14 Photocatalytic cloth 7,16 tube cover 12 Shape memory alloy wire

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-207289 (JP, A) JP-A-11-47612 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B01J 21/00-38/74 JISST file (JOIS) WPI (DIALOG)

Claims (10)

(57) [Claims] 1. A metal wire comprising: a cloth composed of a metal wire fiber and a glass wire fiber; and a resin coating layer containing titanium oxide applied to the metal wire fiber and the glass wire fiber. The fiber is a photocatalytic cloth including a metal wire of a shape memory alloy. Wherein the titanium oxide, a noble metal including platinum
Supported or silica, alumina, and apatite
A non-photocatalytic cell selected from the group consisting of
The cloth according to claim 1 , wherein Lamix is carried . 3. The cloth according to claim 1, wherein the resin coating layer contains a fluororesin. 4. The cloth according to claim 1, wherein the content of titanium oxide in the resin coating layer is 1% by weight or more and 60% by weight or less based on the resin. 5. The cloth according to claim 1, wherein the metal wire fiber is adapted to be heated by passing electricity. 6. The cloth according to claim 1, wherein the metal wire of the shape memory alloy is shape-memory capable of imparting a predetermined shape to the cloth at an ambient temperature during use of the cloth. 7. The cloth according to claim 1, which is a tube cover. 8. The shape-memory alloy metal wire is shape-memorized so that the cloth changes into a shape corresponding to the tube at a set temperature corresponding to the operating temperature of the tube. The cross described in 7. 9. A metal wire comprising: a cloth composed of a metal wire fiber and a glass wire fiber; and a resin coating layer containing titanium oxide applied to the metal wire fiber and the glass wire fiber. A cloth is a cloth that is designed to be heated by electricity. 10. A cloth comprising a cloth composed of a metal wire fiber and a glass wire fiber, and a cloth comprising a resin coating layer containing titanium oxide applied to the metal wire fiber and the glass wire fiber. Tube cover.