JPH08229336A - Photoreactive harmful substance removing material and its production - Google Patents

Abstract

PURPOSE: To obtain a photoreactive harmful substance removing material for separating and removing harmful substances such as malodor or bacteria with light by using a composite body composed of a photoreactive semiconductor, a carrier and a flame resistant thermoplastic resin jointly with a flame-resistant air permeable sheet, provided with practical various conditions such as flame resistance property and easy to handle. CONSTITUTION: The composite body is formed by mixing a carrier body having the photoreactive semiconductor adsorbed on a carrier with the flame resistant thermoplastic resin and kneading in a condition equal to above the m.p. of the thermoplastic resin. And the composite body is interposed between the flame resistant air permeable sheets of >=2 layers and treated in the condition of equal to above the m.p. of the thermoplastic resin to be integrated. As the photoreactive semiconductor, titanium oxide is particularly preferable in the view point of excellent deodorizing property. As the carrier, activated carbon or zeolite as one excellent in adsorption power and iron sesquioxide as one having catalytic activity are exemplified. As the thermoplastic resin, an ethylene-vinyl acetate copolymer or the modified polymer is exemplified. As the form of the flame resistant air permeable sheet, an unwoven fabric-like one is particularly preferable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photoreactive harmful substance removing material capable of decomposing harmful substances such as malodor and bacteria by utilizing photoreaction, and more specifically, a photoreactive substance having flame retardancy. And a method for producing the same.

[0002]

2. Description of the Related Art With increasing interest in environmental issues,
There is an increasing demand for removing harmful substances such as bad odors in daily life, and air purifiers incorporating a bad odor removing device are being actively developed.

Generally, a filter containing activated carbon is used in an air purifier or the like, and a method of adsorbing a harmful substance to the activated carbon has been taken. However, activated carbon only showed an adsorptive effect, and after absorbing a certain amount of harmful substances, the entire filter had to be replaced. Further, since high temperature is required even when regenerating, there is a problem in heat resistance of other parts constituting the filter, and there is no inexpensive and reusable filter.

In recent years, in order to deal with such a problem, a material combining activated carbon and a catalyst for decomposing harmful substances has been developed. For example, Japanese Patent Application Laid-Open No. 1-234729 discloses an air conditioner in which a photoreactive semiconductor layer composite in which titanium oxide is supported on honeycomb-like activated carbon is incorporated. In this case, a part of the malodorous component to be adsorbed is decomposed by the OH radical generated in the photoreactive semiconductor, so that the adsorption capacity of activated carbon can be maintained for a relatively long period of time.

However, in this method, a special honeycomb-like activated carbon is required to carry a photoreactive semiconductor and to enhance the photoreaction efficiency, and in order to retain titanium oxide on the surface and inside the honeycomb. A special process was required, and it was necessary to use a sponge-like cushioning material to prevent it from falling off.

Further, JP-A-2-253848 describes an ozone decomposition catalyst in which anatase type titanium oxide is supported on an inorganic fibrous carrier. In this case, the ozone decomposing ability at a low temperature was improved as compared with the case where the activated carbon was not used, but the ozone decomposition rate was merely measured using the Pyrex with an inner diameter of 20 mm, and nothing was shown about the processing as a specific sheet. Didn't.

In Japanese Laid-Open Patent Publication No. 3-233100, a mixture of titanium dioxide and activated carbon and a wavelength of 300 n are added to the mixture.
It is described with respect to a ventilation facility including a light source that emits light of m or more. In this case, an adhesive is applied to the outer peripheral surface of the glass tube, and a mixed powder of titanium dioxide, activated carbon powder and iron oxide powder pulverized to the submicron order is sprinkled and adhered on the adhesive. Although the photoreactive semiconductor thus constructed is suitable for use in a fixed place such as in a tunnel, since it is fixed on the surface of the glass tube with an adhesive, the photoreactive semiconductor is However, its effective surface area was reduced, and its handling was limited because it was not a flexible sheet.

Further, Japanese Patent Application Laid-Open No. 4-256755 discloses that by supporting titanium dioxide on granular pulp, it can be used as a deodorizing and deodorizing material for household use. Was not indicated.

Kuninaga et al. Use titanium dioxide retained on ceramics paper to perform photolysis of organic halogen compounds (Electrochemical Society, Vol. 60, page 107, 1992). However, heat treatment at 500 to 800 ° C. was required to hold titanium dioxide and handle it as a sheet material.

Further, in the conventional methods, the emphasis is placed on how to effectively perform deodorization, and no consideration is given to the location of the deodorization. For example, the deterioration or discoloration of the base material due to light may occur. However, the current situation is that the range of use has naturally been limited.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to make a sheet-like photoreactive substance capable of decomposing and removing harmful substances such as odors and bacteria by light, and having practical conditions. To provide a material for removing harmful substances.

[0012]

Means for Solving the Problems As a result of earnest research, the present inventors have enclosed a photoreactive semiconductor, a carrier, and a flame-retardant thermoplastic resin between two or more flame-retardant breathable sheets. Therefore, it was found that the above-mentioned problems can be achieved. Also,
The photoreactive semiconductor harmful substance removing material may be manufactured by forming a composite of a photoreactive semiconductor, a carrier, and a flame-retardant thermoplastic resin by a special method, and enclosing it between flame-retardant breathable sheets. I found that I could do it. The present invention has been achieved based on the above findings.

That is, in the photoreactive harmful substance removing material of the present invention, a composite comprising a photoreactive semiconductor, a carrier, and a flame-retardant thermoplastic resin is enclosed between two or more layers of flame-retardant breathable sheets. It is characterized by being

In the method for producing a photoreactive harmful substance removing material of the present invention, a carrier in which a photoreactive semiconductor is adsorbed on a carrier is mixed with a flame-retardant thermoplastic resin, and the temperature is not less than the melting point of the thermoplastic resin. Characterized by kneading under conditions to form a composite, interposing the composite between two or more layers of flame-retardant air-permeable sheets, and further treating under the condition of the melting point of the thermoplastic resin or higher to integrate. It is what

Further, in the method for producing a photoreactive harmful substance removing material of the present invention, a carrier having a photoreactive semiconductor adsorbed on a carrier is mixed with a flame-retardant thermoplastic resin, and the melting point of the thermoplastic resin is mixed. Kneading under the above conditions to form a composite,
Layers or more flame-retardant breathable sheets are stacked and treated under the conditions of the melting point of the thermoplastic resin or more to fix the composite, or the treated sheet and the flame-retardant breathable sheet At least one layer is laminated and integrated.

The present invention will be described in detail below. The photoreactive semiconductor in the present invention is a semiconductor that causes a photocatalytic reaction having a band gap of 0.5 to 5.0 eV, preferably 1 to 3 eV, and a harmful substance is decomposed by OH radicals generated in the photoreactive semiconductor. To be done. The form of the photoreactive semiconductor is preferably in the form of particles, and those particles having a specific surface area of 10 to 500 m ² / g are appropriately selected and used.

Examples of such a photoreactive semiconductor include those disclosed in JP-A-2-273514, and metal oxides such as zinc oxide, tungsten trioxide, titanium oxide and cerium oxide can be mentioned. Of these, titanium oxide is particularly preferable because it has excellent deodorizing properties.

Examples of titanium oxide include titanium dioxide, hydrous titanium oxide, hydrated titanium oxide, metatitanic acid,
Includes orthotitanic acid and titanium hydroxide. The crystal form is not particularly limited. When using titanium oxide,
The specific surface area is preferably 50 to 400 m ² / g. Further, the surface of titanium oxide may be coated with a metal such as platinum, gold, silver, copper, palladium, rhodium or ruthenium, or a metal oxide such as ruthenium oxide or nickel oxide.

The carrier used in the present invention is for supporting a photoreactive semiconductor. By the photocatalyst generated from the photoreactive semiconductor of the present invention, harmful substances such as bad odors that come into contact can be excluded, but on the other hand, organic components such as thermoplastic resins are deteriorated and discolored. However, by supporting a photoreactive semiconductor on a carrier, direct contact with a thermoplastic resin or a flame-retardant breathable sheet can be reduced, and discoloration as a photoreactive harmful substance removing material can be reduced to some extent. be able to.

Further, it is possible to use a carrier which itself has a capability of adsorbing a malodorous substance, and in this case, the malodorous substance adsorbed by the carrier can be decomposed sequentially by the photoreactive semiconductor. Considered to be a very efficient method. Moreover, one having a catalytic action is also one of the preferable materials.

Concretely, as those having excellent adsorption ability,
Activated carbon, zeolite, iron-based metal compounds such as ferric sesquioxide having a catalytic action, zinc oxide, magnesium oxide, aluminum oxide, silica, silica-alumina-zinc oxide composite, composite phyllosilicate, silica-zinc oxide composite Or a mixture of these.

The carrier may be in the form of particles,
Pellets and tablets are mentioned, but particles are most preferable from the viewpoint of supporting a large amount of photoreactive semiconductor.

These particulate carriers have a specific surface area of 50.
A carrier of up to 2000 m ² / g can be appropriately selected and used. In the case of activated carbon, those having a specific surface area of 500 to 1500 m ² / g are preferable.

The photoreactive semiconductor may be used in the form of particles, pellets, tablets or the like together with the carrier, or may be used by being compounded by a method such as simple mixing. As the latter method, there is a method of covering the surface of the carrier with the photoreactive semiconductor, in addition to the simple mixing of the photoreactive semiconductor and the carrier.

Specifically, a method of combining and mixing activated carbon and titanium oxide is exemplified. The advantage of this method is
Since titanium oxide is covered around the activated carbon, the titanium oxide is exposed on the surface of the carrier, and the titanium oxide is in a form in which the light is easily irradiated.

In the prior art, the larger the amount of the photoreactive semiconductor and the carrier to be enclosed between the flame-retardant and air-permeable sheets, the more effective the removal of harmful substances such as malodor is. There is a problem that the photoreactive semiconductor or the simple substance cannot be sufficiently held between the sheets only by adhering the flame-retardant breathable sheets.

As a method for solving this problem, the present applicant has invented and applied for a method of using a thermoplastic resin in combination with a photoreactive semiconductor and a carrier as a method for solving this problem.

In the present invention, the inventors of the present invention have studied the invention of the same application, in which the thermoplastic resin melts only at a heated portion to assist fusion between the flame-retardant breathable sheets,
The thermoplastic resin is used for the purpose of surely enclosing a larger amount of the photoreactive semiconductor and the carrier between the flame-retardant breathable sheets. Therefore, the thermoplastic resin does not reduce the effective surface area of the photoreactive semiconductor.

Specific examples of the thermoplastic resin used in the present invention include ethylene vinyl acetate copolymer resins or modified polymers thereof, ethylene acrylate copolymer resins, ionomer resins, polyamides, nylon resins, polyesters, polypropylene and vinyl acetate copolymers. Examples thereof include polymer-based, cellulose derivative-based, polymethylmethacrylate-based, polyvinyl ether-based, polyurethane-based, and polycarbonate-based resins.

The preferred resin form is a fine particle form because it forms a carrier from the photoreactive semiconductor and the carrier and does not impair the specific surface area of these. In this case, the particle size is 10 to 500 μm in apparent average particle size.
The degree is preferably about this, and there is no problem with this particle size even if the particles are in the state of secondary aggregation.

The amount of the thermoplastic resin used is, in terms of the mixing ratio of the photoreactive semiconductor and the carrier, 1 to 30 parts by weight of the thermoplastic resin based on 100 parts by weight of the total weight of the photoreactive semiconductor and the carrier. It is more preferably 2 to 20 parts by weight. When used in this range, it is possible to prevent the composite of the photoreactive semiconductor, the carrier, and the thermoplastic resin enclosed in the photoreactive harmful substance removing material from falling off.

Further, in order to enclose and retain as many photoreactive semiconductors and carriers as possible, the content of the thermoplastic resin in the photoreactive harmful substance removing material can be increased accordingly.
Since the thermoplastic resin itself is flammable, when the content of the thermoplastic resin is large, the combustion of the resin itself cannot be stopped by the flame-retardant breathable sheet, which is one of the objects of the present invention. It becomes difficult to maintain flame retardancy. Therefore, in the present invention, it is preferable that the thermoplastic resin also has flame retardancy. In other words, it is preferable that the four components which are the constituent materials of the present invention, that is, the photoreactive semiconductor, the carrier, the thermoplastic resin, and the flame retardant breathable sheet have flame retardancy.

Examples of the method for imparting flame retardancy to the thermoplastic resin include a method of imparting a flame retardant to the surface of the thermoplastic resin and a method of kneading the flame retardant into the thermoplastic resin.

Examples of the flame retardant include phosphorus-based flame retardants,
Examples thereof include halogen-based flame retardants, inorganic flame retardants, nitrogen flame retardants, and mixed systems thereof.

Phosphorus-based flame retardants include phosphoric acid ester-based, halogen-containing acid ester-based, polyphosphate-based, nitrogen-containing phosphorus compound-based, red phosphorus-based, etc .; and halogen-based flame retardants such as chlorine-based and bromine-based flame retardants. Examples of the inorganic flame retardant include tin oxide, antimony trioxide, zirconium hydroxide, and aluminum hydroxide; examples of the nitrogen flame retardant include guanidine.

The blending amount of the flame retardant with respect to the thermoplastic resin is
Depending on the thermoplastic resin to be kneaded, it is possible to mix an amount such that flame retardancy is exhibited.

In the present invention, by using a flame-retardant thermoplastic resin, it is possible to impart flame retardancy to the photoreactive harmful substance removing material and prevent the spread of flame, as well as to prevent the spread of flame from the portion exposed to the flame. There is also an advantage that the photo-reactive semiconductor and the carrier can be prevented from falling off and scattering.

In the present invention, the flame-retardant air-permeable sheet is characterized by having air-permeability for passing harmful substances, light-transmitting property for activating the photoreactive semiconductor, and flame-retardant property. is there. Examples of the shape of such a flame-retardant breathable sheet include a cloth-like, non-woven fabric-like or porous film-like one, but it is easy to control the basis weight and air permeability and is excellent in processability. Particularly preferred is a non-woven fabric.

Such a non-woven fabric is processed into a non-woven fabric and then a flame-retardant agent is added to the non-woven fabric, or a flame-retardant fiber is interposed in the non-woven fabric to the extent that flame retardancy can be maintained. To be The former method is more preferable because the addition of the flame retardant lowers the air permeability and light transmittance of the nonwoven fabric and complicates the manufacturing process.

The fibers that can be used for the non-woven fabric include inorganic fibers such as metal fibers, glass fibers, alumina fibers, and tyranno fibers, aramid fibers, polyphenylene sulfide fibers, polyetherimide fibers, polyparaphenylene benzoxazole fibers, and other polymers. In addition to organic engineering plastic fibers, which themselves have high flame retardancy, polyester fibers made by mixing a general-purpose organic polymer with a flame retardant,
Polyolefin fiber, acrylic fiber, vinylon fiber and the like are suitable.

There is no particular limitation on the method for producing a non-woven fabric using these fibers, and a web obtained by a dry method, a wet papermaking method, a melt blown method, a spun bond method or the like can be used for a water jet method, a needle method, etc. A physical method such as a punch method and a stitch bond method, a heat-bonding method such as a thermal bond method, and a method of expressing strength by an adhesive method such as a resin bond method can be appropriately combined and manufactured.

The photoreactive harmful substance removing material according to the present invention can be used because the photoreactive semiconductor and the carrier are bonded and fixed to the flame-retardant breathable sheet by a thermoplastic resin. The range of is also wide. Therefore, the basis weight of the nonwoven fabric used is not particularly limited, and the breathability,
It can be selected within a range that does not impair the light transmittance, and generally, 20 to 200 g / m ² is a preferred range.

Next, a method of encapsulating a composite composed of a photoreactive semiconductor, a carrier and a flame retardant thermoplastic resin between the flame retardant breathable sheets will be described.

A composite of a photoreactive semiconductor, a carrier, and a flame-retardant thermoplastic resin is prepared by the method described above. Subsequently, the composite is enclosed between the flame-retardant air-permeable sheets, and a nonwoven fabric will be described as an example here.

After the composite is interposed between at least one flame-retardant breathable sheet having two or more layers, the entire surface is adhered with a heating roll, the method is partially adhered with an embossing roll, and a high temperature is used. There is a method of treating in the atmosphere, and these can be used alone or in combination. In both cases, it is necessary to treat the flame-retardant thermoplastic resin under the conditions of melting point or higher.

Alternatively, after the composite is stacked on the flame-retardant breathable sheet and the composite is fixed by adhering the composite to the flame-retardant breathable sheet by the above-mentioned method, the treated sheets are joined together. Alternatively, there may be mentioned a method of laminating at least one layer of the treated sheet and a flame-retardant air-permeable sheet, or a method of laminating by any method and then integrating them by the above-mentioned treatment method. It is also a preferable method to integrate the laminated materials by a needle punching method, a water jet method, a stitch bond method, a resin bond method (using a flame-retardant resin).

[0047]

The photoreactive harmful substance removing material of the present invention is capable of decomposing harmful substances such as malodor and bacteria with light such as sunlight by means of a photoreactive semiconductor. Further, the photoreactive harmful substance removing material of the present invention is not only flame-retardant itself, but also each component constituting it is flame-retardant, so that it is exposed to a flame. Since the photoreactive semiconductor and the carrier do not fall off, it can be widely used practically.

The photoreactive harmful substance removing material of the present invention is a curtain or bed sheet for partitioning beds in hospitals, bed sheets for bedridden elderly people, sheets or curtains for pets, or roll curtains for indoors, cars, trains, etc. It is particularly suitable for fields such as room partitions.

[0049]

EXAMPLES The present invention will be described in more detail with reference to examples below, but the invention is not limited thereto. In addition, all percentages described in the text are percentages by weight.

Example 1 [Production of a flame-retardant breathable sheet] 40% polyester fiber (Visylon, manufactured by Asahi Kasei) having a fineness of 0.15 denier (d) and a fiber length of 7.5 mm, a fineness of 1.5 d, a fiber length 15
mm polyester flame-retardant fiber (manufactured by Teijin Limited, Trevira C
S) The mixture was put into water together with 3% of a nonionic surfactant at a ratio of 60%, and was vigorously stirred with a pulper until the bundle of fibers disappeared. Then, after adding water to dilute, add 0.1% solution of high-molecular polyacrylamide (viscous agent) while gently stirring with an agitator to increase the viscosity and continue stirring to suspend the uniformly dispersed fibers. A suspension was obtained. Using this slurry, papermaking was carried out with a cylinder paper machine to produce a web.

Next, the produced web was loaded on a stainless wire mesh support corresponding to 100 mesh, and a water stream was jetted from above the web to entangle the fibers. Five nozzle heads equipped with nozzles were used for the entanglement, and the entanglement was performed once for each of the front and back. Table 1 and Table 2 below show the nozzle (water flow) diameter, nozzle (water flow) interval and pressure of each head.
The front surface was entangled with the nozzle arrangement shown in Table 1, and the back surface was formed with the nozzle arrangement shown in Table 2. However, the head of No. 5 on both sides used a low-pressure water stream for surface adjustment. After the confounding,
Drying was performed using an air through dryer. Thus, a flame-retardant breathable sheet made of a flame-retardant polyester nonwoven fabric having a basis weight of 60 g / m ² was obtained.

[0052]

[Table 1]

[0053]

[Table 2]

[Production Example of Complex] As a carrier, 20 to 42
To 40 parts of activated carbon powder (manufactured by Takeda Pharmaceutical Co., Ltd.) having a mesh (average particle size 5 μm), 1 part of titanium dioxide powder (manufactured by Nippon Aerosil Co., Ltd., P25S6) was used as a photoreactive semiconductor.
It was used at a ratio of 0 part and mixed for 2 hours in a cylindrical mixer.
Further, as a thermoplastic resin, a vinyl acetate resin powder 1 in which a phosphoric acid ester flame retardant and antimony trioxide are kneaded.
5 parts were added, and the mixture was further mixed for 2 hours and treated at 70 ° C. for 2 minutes to obtain a composite composed of titanium dioxide, a carrier and a flame-retardant thermoplastic resin.

[Production of Photoreactive Hazardous Substance Removing Material] The above-mentioned composite was loaded on the above flame-retardant polyester non-woven fabric so as to have a weight of 50 g / m ^2, and another layer of the above flame-retardant polyester non-woven fabric was added. The layers were overlapped and pressed between an embossing roll heated to 110 ° C. and a flat roll to manufacture the photoreactive harmful substance removing material of Example 1.

Comparative Example 1 In Example 1, instead of the polyester flame-retardant fiber,
Photoreactive poison of Comparative Example 1 was carried out in the same manner as in Example 1 except that a polyester fiber having a fineness of 1.5 d and a fiber length of 15 mm (Tepyrus made by Teijin Ltd.) was used and a flammable polyester nonwoven fabric was used as the breathable sheet. A material removal material was produced.

Comparative Example 2 The photoreactive harmful substance removing material of Comparative Example 2 was produced in the same manner as in Example 1 except that the vinyl acetate resin powder in which the flame retardant was not kneaded was used.

Example 2 Titanium dioxide powder was used as a photoreactive semiconductor in an amount of 10 parts with respect to 80 parts of a composite phyllosilicate (Mizukanite AP manufactured by Mizusawa Chemical Co., Ltd.) having a size of 20 to 40 mesh as a carrier. The photoreactive harmful substance removing material of Example 2 was manufactured in the same manner as in Example 1.

Example 3 On the flame-retardant polyester non-woven fabric of Example 1, the composite obtained in Example 1 was loaded so as to be 25 g / m ^2, and heated at 110 ° C. to fix the composite. Two layers of this sheet, the surfaces on which the composite was fixed, were put together, and pressed between an embossing roll and a flat roll heated to 110 ° C. to manufacture the photoreactive harmful substance removing material of Example 3.

Example 4 A meta-aromatic polyamide fiber having a fineness of 1.5 d and a fiber length of 38 mm (manufactured by Teijin Ltd., Conex) was opened with a card to form a web, which was laminated with a cross wrapper and then needle punched. Fibers were entangled by the method to obtain a flame-retardant breathable sheet having a basis weight of 60 g / m ² . Except for this, the photoreactive harmful substance removing material of Example 4 was manufactured in the same manner as in Example 3.

[Evaluation of Performance of Photoreactive Hazardous Substance Removing Material] The photoreactive harmful substance removing materials produced in the above Examples 1 to 4 and Comparative Examples 1 and 2 were evaluated according to the following performance test, and the results are summarized. The results are shown in Tables 3 and 4 below.

1. Deodorizing property A) Deodorizing property by ultraviolet light irradiation The photoreactive harmful substance removing material was trimmed to a size of 10 cm × 20 cm, and equipped with a 6 W black lamp 5.6.
Placed in the bottom of a liter closed container. Into this container, 4 ml of saturated acetaldehyde, which is the main component of cigarette odor, was injected (concentration: about 500 ppm), and the photoreactive toxic substance was removed with a black lamp from about 20 cm above the photoreactive toxic substance removal material to 6 W. The material was irradiated with ultraviolet light. The acetaldehyde concentration after 30 minutes was quantified by gas chromatography. In addition, saturated-acetaldehyde 4 in the container
The operation of injecting ml and irradiating with ultraviolet light and quantifying the acetaldehyde concentration after 30 minutes was successively repeated 3 times. (Unit: ppm)

B) Deodorizing property when not irradiated with ultraviolet light The acetaldehyde concentration was quantified in the same manner as in the above method A except that the method was performed in the dark without irradiation with ultraviolet light. (Unit: ppm)

2. The antibacterial photoreactive harmful substance removing material is trimmed to a size of 10 cm × 10 cm, immersed in an aqueous solution of Pseudomonas aeruginosa with a concentration of 70,000 cells / ml, and approximately 20 cm above the photoreactive harmful substance removing material.
From a 6W black lamp for 4 hours.
Four hours after irradiation, the viable cell count of the Pseudomonas aeruginosa solution was measured by the pour plate culture method (culture at 35 ° C. for 48 hours) using a standard agar medium, and the concentration was converted. The concentration of Pseudomonas aeruginosa after 4 hours of irradiation with ultraviolet light with respect to the initial concentration of Pseudomonas aeruginosa is expressed as a reduction ratio of the concentration of Pseudomonas aeruginosa due to irradiation with ultraviolet light.

3. Flammability For flame retardance, use a photoreactive harmful substance remover
Tested according to IS L1091 method A-1.

4. Peeling strength The photoreactive harmful substance removing material is trimmed to a size of 2 cm × 15 cm, and cut into one end to form two breathable sheets, and the ends are peeled off by 7 cm from each other. After fixing with a chuck, the peel strength was measured with a Tensilon universal tester (manufactured by Orientec Co., Ltd.) at a distance (span) of 10 cm between both chucks, and the average of 10 maximum peel strengths was taken as the interlayer peel strength (unit: g). ) As.

[0067]

[Table 3]

[0068]

[Table 4]

From the above Tables 3 and 4, the photoreactive harmful substance removing material of the present invention shows deodorizing property, antibacterial property, delamination strength,
It had excellent flame retardancy. on the other hand,
The photoreactive harmful substance removing material of Comparative Example 2 was slightly inferior in combustion performance to the Examples. In addition, it was found that many white and black fine powders fell from the sample after burning. It is considered that the thermoplastic resin burned, and the photoreactive semiconductor having lost the adhesive force and the carrier dropped. The photoreactive harmful substance removing material of Comparative Example 2 easily peeled off between the layers after the combustion test.

[0070]

As described above, in the photoreactive harmful substance removing material of the present invention, a composite comprising a photoreactive semiconductor, a carrier, and a flame retardant thermoplastic resin and a flame retardant breathable sheet are used together. Therefore, it is possible to decompose and remove harmful substances such as bad odors and bacteria with light, and easy-to-handle sheet-like photoreactive harmful substance removal material with practical conditions such as flame retardancy and strength. Can be provided.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B01J 35/06 B01D 53/36 J B32B 5/22 ZABH

Claims (3)

[Claims] 1. A photoreactive harmful substance removing material in which a composite comprising a photoreactive semiconductor, a carrier and a flame retardant thermoplastic resin is enclosed between two or more layers of a flame retardant breathable sheet. 2. A carrier in which a photoreactive semiconductor is adsorbed on a carrier is mixed with a flame-retardant thermoplastic resin, and the mixture is kneaded at a temperature equal to or higher than the melting point of the thermoplastic resin to form a composite. A method for producing a photoreactive harmful substance removing material, characterized in that the body is interposed between two or more layers of flame-retardant breathable sheets, and further treated under the condition of the melting point of the thermoplastic resin or higher to be integrated. 3. A carrier in which a photoreactive semiconductor is adsorbed on a carrier is mixed with a flame-retardant thermoplastic resin, and the mixture is kneaded at a temperature not lower than the melting point of the thermoplastic resin to form a composite. The sheets are stacked on one or more layers of flame-retardant breathable sheet and treated under the condition of the melting point of the thermoplastic resin or more to immobilize the composite, or the treated sheet and the flame-retardant breathable sheet. A method for producing a photoreactive harmful substance removing material, characterized in that at least one layer of a photosensitive sheet is laminated and integrated.