JP2000042126A - Face mask - Google Patents

Abstract

(57) [Abstract] [Problem] Sterilization by adsorbing surface, virus, odor source, etc.
Obtaining a mask for a facepiece that can be decomposed and removed. SOLUTION: The layer has at least one layer made of a woven or non-woven fabric containing a polytetrafluoroethylene fiber containing a photolysis catalyst, and has a pressure loss of 5 cm / sec at a wind speed of 5 cm / sec.
A mask for a planar body having a size of not more than mmH ₂ O.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a face mask made of PTFE fiber containing a photolysis catalyst.

[0002]

2. Description of the Related Art A photodecomposition catalyst is a substance which is activated by light energy, particularly high wavelength light energy such as ultraviolet light, and exhibits a catalytic ability to decompose a compound, and comprises anatase type titanium oxide (TiO ₂ ) zinc (ZnO), etc. tungsten trioxide (W ₂ O ₃₎ is known. These photodecomposition catalysts are known to decompose odorous compounds and have a bactericidal action, and are used for deodorizing and antibacterial use. In order for such a photolysis catalyst to work effectively, it must be in direct contact with harmful substances. However, when the material supporting the photodecomposition catalyst is an organic substance, the photodecomposition catalyst may also decompose the material itself.

[0003] Polytetrafluoroethylene (PTFE)
Is a material that is insulated from this decomposition action, and thus a film-like material such as a sheet or a film containing a photodecomposition catalyst using PTFE or the like as a matrix has been proposed ("Industrial Materials" July, 1996). Monthly (Vol.4
4, no. 8)).

Further, the present inventors have disclosed a PTFE fibrous material containing the photolysis catalyst in Japanese Patent Application No. 8-333828 in order to more effectively use the photolysis catalyst.

[0005] For example, a person suffering from a cold or the like is required to prevent inhalation of bacteria and viruses by spraying by coughing, sneezing, etc. In order to prevent unbearable odorous gas, a mask is worn, and bacteria, viruses, harmful gas or odorous gas are attached to or adsorbed on the mask. However, use with bacteria, viruses, harmful gas or odorous gas attached or adsorbed on the mask,
Since the sterilizing action and the gas decomposition action are poor, there is a problem that frequent replacement is disposable.

Therefore, the present inventors have proposed a PT containing a photocatalyst.
Paying attention to the fact that the use of FE fibers can achieve a sterilizing action and a gas decomposition action, they have completed a reusable face mask.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a face mask made of PTFE fibers containing a photolysis catalyst.

[0008]

The present invention comprises at least one layer of a woven or non-woven fabric containing a PTFE fiber containing a photolysis catalyst and having a pressure loss of 5 mmH ₂ O or less at a wind speed of 5 cm / sec. The present invention relates to a face mask.

In this case, the PTFE fiber containing a photolysis catalyst preferably contains 1 to 50% by weight of the photolysis catalyst.

Preferably, the photolysis catalyst is an anatase type titanium oxide.

Preferably, the PTFE is a semi-sintered body.

It is preferred that the PTFE further contains an adsorbent having deodorizing activity.

The face mask according to claim 5, further comprising an adsorbent having a deodorizing activity.

The PTFE fiber containing the photolysis catalyst is preferably in the form of a monofilament or its twisted yarn.

[0015] The PTFE fiber containing the photolysis catalyst is preferably in the form of a staple fiber.

In these cases, it is preferable that the PTFE fiber containing the photolysis catalyst has a branch.

The PTFE fiber containing the photolysis catalyst is preferably in the form of a continuous yarn in which the PTFE fiber is split into a mesh.

It is preferable that at least one other fibrous material is blended or twisted with the PTFE fiber containing the photolysis catalyst.

In this case, it is preferable that at least one of the other fibrous materials is fibrous activated carbon.

Further, at least one of the other fibrous materials may be used.
Preferably, the species contains or is coated with an adsorbent with deodorant activity.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION
TFEs include homopolymers of tetrafluoroethylene (TFE) and copolymers of TFE with up to 0.2% of other comonomers. Examples of the comonomer include chlorotrifluoroethylene, hexafluoropropylene,
Examples thereof include perfluoroalkyl vinyl ethers, but are not limited thereto. The polymerization method may be either an emulsion polymerization method or a suspension polymerization method.

The photolysis catalyst used in the present invention includes anatase type titanium oxide, zinc oxide, tungsten trioxide and the like. The form is usually a powder. Of these photodecomposition catalysts, anatase-type titanium oxide can decompose a wide variety of odorous substances, such as ammonia, acetaldehyde, acetic acid, trimethylamine, methyl mercaptan, hydrogen sulfide, styrene, methyl sulfide, dimethyl disulfide, isovaleric acid, and the like. It is particularly preferable because it can be performed and the effect is exhibited even with weak light (ultraviolet light).

The content is 5% in view of the speed of the deodorant and antibacterial action.
%, And it is preferably 50% or less, and particularly preferably 10 to 40%, in terms of ease of molding.

The "fiber" in the present invention is a concept including a form such as a monofilament, a staple fiber, a split yarn, and a processed yarn as described above.

As a method for producing such a PTFE fiber containing a photolysis catalyst, for example, the following production method can be mentioned.

(1) Production of monofilament (A) Production by emulsion spinning method (US Pat.
772,444) Fine dispersion of PTFE, photodecomposition catalyst powder, surfactant and aqueous dispersion of coagulant (coagulant such as sodium alginate which coagulates under acidic activity) is finely dispersed in an acid bath. Extruded from a simple nozzle, dried the solidified fibrous extrudate,
A monofilament is obtained by sintering and stretching.

(B) Production by film defibration (WO9
(A) Production of PTFE raw material powder containing titanium oxide A PTFE emulsion polymerization aqueous dispersion and an aqueous dispersion of a photolysis catalyst powder are mixed and then stirred, or a coagulant (hydrochloric acid, nitric acid, etc. is added dropwise). Is added and stirred, and simultaneously with the aggregation of the PTFE primary particles, the photolysis catalyst powder is dispersed in the same body to form aggregated secondary particles (average particle diameter of 200 to 1000 μm), and then the water is dried to obtain a powder ( a-1).

As another method, there is a method (a-2) of uniformly mixing a PTFE molding powder obtained by a suspension polymerization method and a photolysis catalyst powder.

(B) Production of unfired film An extrusion aid (for example, Isopar M, a petroleum solvent manufactured by Exxon) is added to the mixed powder obtained in the above (a), and the mixture is formed into a film by paste extrusion and calender molding. Then, the auxiliary is dried to obtain an unfired film.

(C) Heat-treated film (fired film A,
Production of semi-baked film B) For the baked film A, the unbaked film obtained in the above (b) was used as P
It can be obtained by heating at about the melting point of the TFE powder or higher in an atmosphere of usually 350 to 380 ° C. for about 2 minutes or more.

Further, the mixed powder obtained in the above (a-2) is compression-molded to obtain a cylindrical preformed part, which is heated at a temperature of 360 ° C. for 15 hours, cooled, and then cut into a film. it can.

The semi-baked film B is obtained by heat-treating the unbaked film (b) at a temperature between the melting point of the PTFE powder (about 345-348 ° C.) and the melting point of the sintered product (325-328 ° C.). Can be

As another method for producing the film, there is a method in which a mixed dispersion of fluororesin particles and titanium oxide particles is coated on a fluororesin film and sintered. Further, the dispersion may be coated on a plate of aluminum or the like or a polyimide film and then sintered to obtain a film as a casting film.

The fluororesin particles and film at this time may be PTFE alone or a mixture and composite of other PFA and FEP.

(D) Production of Stretched Films (C and D) The stretched film is passed between rolls under heating in the longitudinal direction.
By changing the relative speed between the rolls, the fired film A can be stretched to about 5 times (stretched film C) and the semi-baked film B can be stretched to about 5 to 20 times (stretched film D).

(E) Monofilament As one method, the monofilament is used as the fired film A
Alternatively, it can be obtained by cutting the semi-baked film B finely and then stretching it in the longitudinal direction.

Alternatively, a branched structure can be obtained by rubbing the stretched films C and D with a rotating needle blade roll. Further, after rubbing, it can be obtained by dividing.

The maximum thickness of the monofilament is determined by the film raw material, and the minimum is determined by the minimum width of the slit, which is about 25 Tex.

(2) Production of staple fiber (WO9
The staple fiber can be manufactured by cutting the above-mentioned monofilament into an arbitrary length (a preferable length is about 25 mm to 150 mm). In order to increase the surface area with finer fibers by increasing the entanglement of the fibers, it is preferable to use branched staple fibers. The branched staple fiber is drawn film C or D
Is rubbed with a needle blade roll rotating at high speed.

The staple fiber has a branch and a crimp, and can be used alone or in the form of a processed yarn described later.

Preferred properties of the staple fiber obtained by this method are illustrated below, but are not limited thereto.

Fiber length: 5 to 200 mm, preferably 10 to 150 mm Number of branches: 0 to 20/5 cm, preferably 0 to 10/5 mm Number of crimps: 0 to 25/20 mm, preferably 1 to 15 pieces / 20 mm Fineness: 1 to 150 denier, preferably 2 to 75 denier Cross section: irregular shape

(3) Production of split yarn (WO95)
/ 008007) Using the uniaxially stretched film C or D produced in the above (1)-(B) (d), the film is firstly 5 to 20 m wide.
It can be manufactured by slitting using a needle blade roll, preferably a pair of needle blade rolls, after slitting into a ribbon shape of about m.

The resulting split yarn has a network structure. The mesh structure refers to a structure in which the uniaxially stretched PTFE film split by the needle blade of the needle blade roll does not become a disjointed fiber, but becomes a net shape when expanded in the width direction (a direction orthogonal to the film feeding direction). .

The split yarns can be provided for weaving or knitting alone, or in a bundle of two or more, or in the form of a processed yarn described later.

(4) Manufacture of Processed Yarn Manufacture by combining the PTFE fiber (monofilament, staple fiber or split yarn) containing the photolysis catalyst manufactured in the above (1), (2) or (3) with other fibrous materials Is done.

The blending and twisting can be carried out in a conventional manner.

Examples of other fibrous materials include fibrous activated carbon; natural fiber materials such as cotton and wool; semi-synthetic fiber materials such as rayon; synthetic fiber materials such as polyester, nylon and polypropylene. As a deodorant antibacterial cloth when the odor becomes strong (the gas concentration becomes high or it is felt strongly due to individual differences), fibrous activated carbon or the like is preferable. Examples of the fibrous activated carbon include those produced from acrylic fibers. Since the effect of gas and odor intensity of the photodecomposition catalyst-containing PTFE fiber greatly varies depending on the individual difference, it is preferable that the PTFE fiber occupies 10% or more, particularly 20% or more of the processed yarn.

In the PTFE fiber containing a photolysis catalyst of the present invention, an adsorbent having a deodorizing activity is present in various forms.
It is preferable to increase the deodorizing efficiency. Adsorbents with deodorant activity include fibrous or particulate activated carbon, zeolites,
Astench C-150 (manufactured by Daiwa Chemical Industry Co., Ltd.) and the like.

When activated carbon and zeolite particles are contained in the PTFE itself in the form of a filler,
It is 25% or less of TFE, preferably 1 to 20%.

Further, in the case of Astensch C-150, other fibrous materials used for forming the processed yarn or cloth (described later) can be coated or impregnated. The method of coating or impregnating Ascench C-150 is
It is preferably obtained by applying an approximately 10% aqueous solution by an ordinary method such as dipping or spraying, dehydrating and drying.

As described above, fibrous activated carbon having deodorizing activity can be used as one of the other fibrous materials of the processed yarn. In this case, 80% or less of the processed yarn, particularly 5 to 5%, is used.
It is preferably 75%.

The PTF containing the photolysis catalyst according to the present invention
The E-fiber is a form in which the deodorant and antibacterial activity by the photodegradation catalytic action is effectively functioned, and is provided to the mask for facepiece of the present invention in the form of a woven fabric, a knitted fabric, a nonwoven fabric or the like.

When a woven fabric is used, PTFE containing a photolysis catalyst is used.
The fibers may be warp and / or weft yarns. As the weaving method, a conventional method such as plain weaving or twill weaving can be adopted.

Next, the non-woven fabric is made of P
It can be manufactured from TFE fiber by a conventional method. For example, staple fibers of PTFE fibers containing a photolysis catalyst may be entangled with each other, or may be entangled with a nonwoven fabric such as felt, spun bond or thermal bond, a mesh, or a base fabric such as woven fabric. Also, the entangled staple fiber of the photolysis catalyst-containing PTFE fiber,
For example, fibers that have a gas adsorption function such as activated carbon fibers, fibers that have a fragrance function, antibacterial fibers in which polyester fibers are coated with copper, etc., and other staple fibers such as polypropylene-electretized fibers are mixed and compounded. May be used.

In particular, when a cup-style mask for a facepiece described below is obtained, antibacterial fibers such as polyethylene, polypropylene, and polyester fibers coated with copper or the like, polypropylene, and the like are electretized from the viewpoint that molding processing is easy. It is preferable to use a hot-melt type resin fiber made of a fiber or the like.

In the present invention, the face mask of the present invention can be produced from the woven or nonwoven fabric thus produced by a conventional method.

When the face mask of the present invention is obtained from these woven or non-woven fabrics, the mask may be in a multi-layered form in combination with a base fabric made of another fibrous material. When a base fabric is used, the base fabric may be in any form of a woven fabric, a nonwoven fabric, or a knitted fabric, and the material may be fibrous activated carbon, meta-aramid fiber, para-aramid fiber, PTFE fiber, polyimide fiber, glass fiber. , Polyphenylene sulfide fiber,
Polyester fibers and the like are preferred. In particular, it is preferable that the base fabric contains fibrous activated carbon in order to enhance the deodorizing effect. The content of fibrous activated carbon in the base fabric is 5 to 100%,
Preferably it is about 10 to 100%.

Next, the structure of the mask for a planar object of the present invention will be described.

FIG. 1 is a partially cutaway perspective view showing an embodiment of the mask for a facepiece of the present invention. In FIG. 1, 1 is an antimicrobial layer, 2 is a surface layer, and 3 is a face layer. According to FIG. 1, the face mask of the present invention has at least one antibacterial layer 1 made of a woven or non-woven fabric containing PTFE fibers containing a photolysis catalyst. Such an antibacterial layer is preferably provided so as to be exposed to light as much as possible in order to exert the function of the photocatalyst, and another layer may be provided outside the layer as far as light reaches to protect the antibacterial layer. For example, it is preferable to have a surface layer 2 made of a woven or nonwoven fabric having a basis weight of about 200 g / m ² or a surface layer 2 made of a mesh of about 10 to 100 mesh from the viewpoint of reducing breath resistance. The surface layer may be a woven or non-woven fabric or a mesh of fibers made of an olefin, for example, polyethylene, polypropylene, rayon, nylon, polyester, etc., from the viewpoint of transmitting light.

The face mask is preferably designed so that the photodecomposition catalyst-containing PTFE fiber does not come into direct contact with the human body, because it prevents discomfort due to wearing. As a method of obtaining such a structure, the face layer 3 not containing the photodecomposition catalyst-containing PTFE fiber on the side that comes into contact with the face body, for example, has a good touch and has a hygroscopic property against moisture during exhalation. A face layer made of rayon, cotton, or the like may be provided.

At this time, it is preferable that the antibacterial layer 1, the surface layer 2 and / or the face layer 3 can be replaced.

FIG. 2 is a partially cutaway perspective view showing another embodiment of the mask for face mask of the present invention. The mask for a planar object shown in FIG. 2 has a cup-shaped form. In FIG. 2, 4 is a cup, and 5 is a filter. In the present invention, a woven or nonwoven fabric made of the PTFE fiber containing the photolysis catalyst may be processed into the cup 4, but from the viewpoint of durability and the like,
The cup 4 is made of, for example, metal or resin, and the cup 4
A woven or non-woven fabric made of the photodecomposition catalyst-containing PTFE fiber can also be used as the replaceable filter 5 to be attached to the device. When the cup is made of resin, a vent hole may be provided.

Further, the face mask of the present invention has a pressure loss of 5 c from the point that the human can breathe easily.
It is particularly preferably 5 mmH ₂ O or less at m / sec, more preferably ₂ mmH ₂ O or less. The lower limit is usually 0.2 mm
H ₂ O is enough.

The photodecomposition catalyst-containing PTFE fiber is blended in order to keep the pressure loss of the face mask within the above range and to enlarge the contact area in order to efficiently capture viruses, bacteria, odor sources and the like. Vertical woven or non-woven fabric
Pleated sideways, the ventilation area can be selected as appropriate. Pleating is preferred in that the contact area between the photolysis catalyst and viruses, bacteria, odor sources, etc. increases.

The face mask of the present invention obtained as described above adsorbs bacteria, viruses, odor sources, etc. exhaled by the human body to prevent its scattering and disinfects, decomposes and removes them by the action of a photocatalyst. be able to. Conversely, bacteria, viruses, chemical substances, odor sources, etc. sucked by the human body can be adsorbed and sterilized, decomposed, and removed.

The facepiece mask of the present invention can be suitably used, for example, as a mask for hospital use (prevention of infection), a mask for cooking and feeding, a mask for allergy to chemical substances, a dustproof mask, a mask for working in an odor atmosphere, and the like. it can.

[0068]

EXAMPLES Next, the mask for a planar object of the present invention will be specifically described based on examples, but the present invention is not limited to only these examples.

Example 1 (1) Production of PTFE Raw Material Powder Containing Titanium Oxide A 10% aqueous dispersion containing 8 kg of emulsion-polymerized PTFE particles (number average molecular weight: 5,000,000, average particle size: about 0.3 μm), and anatase type A 20% aqueous dispersion containing 2 kg of titanium oxide (Titanium Dioxide P25, manufactured by Nippon Aerosil Co., Ltd .; average particle size: about 21 μm) is coagulated in a coagulation tank (volume: 150 liters) each having a stirring blade and a temperature control jacket. (Temperature in tank: 30 ° C.) and stirred to obtain secondary particles in which PTFE particles and titanium oxide particles were uniformly aggregated, and separated from the aqueous phase. The agglomerated particles are dried in an oven (130 ° C.) and PTFE powder containing 20% titanium oxide (average particle size:
500 μm, apparent density: about 450 g / liter).

(2) Production of unfired film The titanium oxide-containing PTFE powder obtained in the above (1) was mixed with 25 parts of a molding aid (Ixon petroleum solvent Isopar M) per 100 parts of the powder. Into a paste. This paste was extruded by a paste extrusion method, rolled by a rolling roll, and the molding aid was removed by drying to obtain a width of 200 m.
m, unfired P containing titanium oxide having a thickness of 100 μm continuously
A TFE film was manufactured.

(3) Production of heat-treated film The titanium oxide-containing unfired PTFE film produced in the above (2) is heat-treated to obtain a titanium oxide-containing fired PTFE film A-1 and a titanium oxide-containing semi-fired PTFE film B-
1 was produced.

The baked PTFE film A-1 is made of unbaked P
Obtained by heating the TFE film in a 360 ° C. oven for about 3 minutes.

The semi-baked PTFE film B-1 was obtained by heating the unfired PTFE film in an oven at 340 ° C. for about 30 seconds. The sintering degree (crystal conversion ratio) of this product is 0.4.

(4) Production of Uniaxially Stretched Film The fired PTFE film A-1 is stretched 5 times in the longitudinal direction between two pairs of heating rolls (diameter: 330 mm, temperature: 300 ° C.) to obtain a uniaxially stretched film C-1. I got

Further, the semi-baked PTFE film B-1 was stretched 10 times in the longitudinal direction using the above-mentioned heating roll to obtain a uniaxially stretched film D-1.

The uniaxially stretched film has titanium oxide particles exposed on the surface as compared with the unstretched film, and can be used as such. Further, when a film described later is formed into a fibrous shape, more preferable characteristics and utilization form can be provided.

(5) Production of Monofilament The fired PTFE film A-1 or semi-fired film B-1 of (3) is slit to a width of 2 mm, and then uniaxially stretched in the same manner as in (4) to obtain a film. 200Tex from A-1 and 10 from film B-1
A monofilament having a rectangular cross section of 0 Tex was obtained.

In addition to the method (6) described later, a staple fiber can be obtained by cutting these monofilaments into short pieces.

(6) Production of staple fiber The uniaxially stretched film C-1 or D-1 obtained in the above (4)
According to the method (4) of Example 5 of WO94 / 23098, using a pair of upper and lower needle blade rolls, the peripheral speed of the needle blade roll (V3) is 1.6 m / min. V4) The staple fiber was obtained by rubbing and fibrillation at 48 m / min. Note that each of the obtained staple fibers was a branched filament.

The fired staple fiber obtained from the uniaxially stretched fired PTFE film C-1 is referred to as E-1, and the semi-fired staple fiber obtained from the uniaxially stretched semi-fired PTFE film D-1 is referred to as F-1.

With respect to the obtained PTFE staple fiber containing titanium oxide, the fiber length, the number of branches, the cross-sectional shape, the fineness and the number of crimps were examined by the following methods. Table 1 shows the results.

(Fiber Length and Number of Branches) The length and the number of branches (including loops) were measured from 100 randomly sampled fibers.

(Cross Section Shape) A randomly sampled fiber bundle was measured by a scanning electron microscope.

(Fineness) One hundred fibers randomly sampled were measured using an electronic fineness measuring device (manufactured by Search) that measures using fiber resonance.

The fibers to be measured are selected from those having a length of 3 cm or more that can be measured by the present measuring device, without being divided into trunks and branches. However, a large branch having a section of 3 cm or a large number of branches was excluded because it would affect the measurement result. The fineness that can be measured with the measuring instrument is 2
Since the fiber density is in the range of 70 denier, the fineness of the fiber exceeding 70 denier was determined by measuring the weight. In addition, those having less than 2 denier were excluded due to measurement difficulty.

(Number of crimps) According to the method of JIS L 1015, 100 fibers randomly sampled were measured using an automatic crimping performance measuring machine manufactured by Koa Shokai Co., Ltd. Crimp is not measured).

[0087]

[Table 1]

(7) Production of split yarn (WO96)
After cutting the uniaxially stretched and fired PTFE film C-1 in the longitudinal direction with a width of 5 mm, the film is rotated at two pairs of high speeds (peripheral speed of the blade: 30 m / min) in which needles are implanted. A needle blade roll is passed at a film feed speed of 5 m / min, and has a network structure of 500
A split yarn of Tex (1 km at 500 g) was produced.

(8) Manufacture of Processed Yarn The fired staple fiber E-1 and the original wool yarn are used in the same weight, and are defibrated, blended, carded and twisted by a conventional method.
A processed yarn of 00Tex (1 km at 200 g) was produced.

Example 2 (Production of Nonwoven Fabric) Fired staple fiber E-of PTFE containing titanium oxide
1. A web was prepared from No. 1 and the web was weighed with a base fabric of meta-aramid fiber (product number CO1700 of Teijin Limited) 200
g / m ² (sample A) and a basis weight of 40 g / m ² (sample B), and needle-punched with a needle having a density of 100 needles / cm ² to obtain a nonwoven fabric.

Further, a web was prepared from the semi-fired staple fiber F-1 of PTFE containing titanium oxide, and this web was treated with a meta-aramid fiber felt (having a basis weight of 350 g / m ²⁾ .
200 g / m ² (sample C) and 40 g per unit area on product number GX-0302 manufactured by Nippon Felt Industry Co., Ltd.
/ M ² (sample D) to obtain a multilayer nonwoven fabric by a hydroentanglement method.

The following deodorizing tests were performed on the obtained nonwoven fabrics (samples A to D). The results (decomposition rate constant k) are shown in Table 2.

(Deodorizing Test) A sample piece (9) was placed in a 5-liter flask (having a gas inlet and a gas vent).
cm × 9 cm), and a light source (black light 6 W × 1) is placed at a position 2 cm away from the sample in parallel, and the change over time in the concentration of the injected acetaldehyde is measured to determine the decomposition rate of acetaldehyde. Acetaldehyde is injected with a syringe so that the initial concentration is about 20 ppm. The change over time in the concentration is measured about every 1 minute with a gas monitor (1302 type multi-gas monitor manufactured by B & K). The concentration C after t minutes is represented by the following equation. C = C ₀ e-kt (C ₀ is initial concentration, e is natural logarithm, k is decomposition rate constant)
The higher the value of k (ppm / sec), the higher the resolution of acetaldehyde.

For comparison, the following films A to D were prepared and subjected to the same deodorizing test. Table 2 shows the results.

Film A: PTF containing 20% titanium oxide
E uniaxially stretched (5 times) fired film (basis weight: 200 g /
m ² ) Film B: uniaxially stretched (5 times) fired film of PTFE containing 20% titanium oxide (basis weight: 40 g / m ² ) Film C: uniaxially stretched (10 times) semi-fired film of PTFE containing 20% titanium oxide ( Basis weight: 200 g / m ² ) Film D: uniaxially stretched (10 times) semi-baked film of PTFE containing 20% titanium oxide (basis weight: 40 g / m ² )

[0096]

[Table 2]

As is clear from Table 2, it can be seen that the decomposition rate of acetaldehyde is remarkably increased by using a nonwoven fabric using PTFE fibers containing titanium oxide. This confirms that the deodorizing effect is excellent.

Example 3 (Production of non-woven fabric) Burned staple fiber E-of PTFE containing titanium oxide
A web was prepared from No. 1 and the web was placed on a fibrous activated carbon felt (a crative manufactured by Kuraray Chemical Co., Ltd .; basis weight: 150 g / m ² ) so as to have a basis weight of 100 g / cm ^2, and 100 webs / cm ² Needle punching was performed with a needle having a density of 2 to obtain a multi-layered nonwoven fabric.

When a deodorizing test was performed on this nonwoven fabric in the same manner as in Example 2, the concentration of acetaldehyde was reduced by half two minutes after the start of light irradiation. Due to this significant drop in concentration, the decomposition rate constant k could not be calculated.

Example 4 (Production of Woven Fabric) The fired split yarn of PTFE containing titanium oxide produced in the above (7) was used as a weft yarn, and 20
A plain woven fabric (400 g / m ² ) was manufactured using a Tex (1 km at 20 g) processed yarn as a warp yarn.

When a deodorizing test was performed on this woven fabric in the same manner as in Example 2, the decomposition rate constant k was 171 × 1.
It was 0 ^-5 .

Example 5 (Production of Woven Fabric) Twilled woven fabric (500 g / m ² ) with ^two weft yarns, using the fired PTFE yarn containing titanium oxide obtained in (8) above.
Was manufactured.

When a deodorizing test was performed on this woven fabric in the same manner as in Example 2, the decomposition rate constant k was 135 × 1
It was 0 ^-5 .

[0104]

According to the present invention, bacteria, viruses, odor sources, etc. exhaled by the human body can be absorbed and prevented from scattering, and can be decomposed and removed by the action of a photocatalyst.
Conversely, it is possible to obtain a facepiece mask that can adsorb bacteria, viruses, chemical substances, odor sources, and the like sucked by the human body, and can also decompose and remove.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a mask for a facepiece of the present invention.

FIG. 2 is a partially cutaway perspective view showing another embodiment of the mask for a facepiece of the present invention.

[Explanation of symbols]

 1 Antibacterial layer 2 Surface layer 3 Face layer 4 Cup 5 Filter

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yu Hirai 1-1-1, Nishiichitsuya, Settsu-shi, Osaka Daikin Industries, Ltd. Yodogawa Works (72) Inventor Mitsaku Sakaguchi 2-4-2 Nakazaki Nishi, Kita-ku, Osaka-shi No. F term in Umeda Center Building Daikin Industries, Ltd. (reference) 2E185 AA07 BA17 CB14 CB16 4L047 AA03 AA18 AB02 AB03 BA03 BA04 CA19 CB10 CC03 4L048 AA14 AA20 AA56 AB01 AB05 AB10 AB16 AB28 AC00 AC01 BA02 CA11 DA22

Claims (13)

[Claims] 1. A woven or nonwoven fabric layer containing a polytetrafluoroethylene fiber containing a photolysis catalyst, and at least one layer made of a woven or nonwoven fabric, and having a pressure loss of 5 cm / sec.
A mask for a planar body having a size of not more than mmH ₂ O. 2. The face mask according to claim 1, wherein the polytetrafluoroethylene fiber containing the photolysis catalyst contains 1 to 50% by weight of the photolysis catalyst. 3. The mask according to claim 1, wherein the photodecomposition catalyst is anatase type titanium oxide. 4. The face mask according to claim 1, wherein the polytetrafluoroethylene is a semi-fired body. 5. The facepiece mask according to claim 1, wherein the polytetrafluoroethylene further contains an adsorbent having deodorizing activity. 6. The face mask according to claim 5, wherein an adsorbent having deodorizing activity is coated. 7. The mask for a facepiece according to claim 1, wherein the polytetrafluoroethylene fiber containing the photolysis catalyst is in the form of a monofilament or a twisted yarn thereof. 8. The photodecomposition catalyst-containing polytetrafluoroethylene fiber is in the form of a staple fiber.
8. The mask for a face body according to any one of 7 above. 9. The mask for a facepiece according to claim 7, wherein the polytetrafluoroethylene fiber containing the photolysis catalyst has a branch. 10. The face mask according to any one of claims 1 to 6, wherein the photodecomposition catalyst-containing polytetrafluoroethylene fiber is in the form of a continuous yarn in which the fibers are split into a mesh. 11. The facepiece mask according to claim 1, wherein at least one other fibrous material is blended or twisted with the photolysis catalyst-containing polytetrafluoroethylene fiber. 12. The mask according to claim 11, wherein at least one of the other fibrous materials is fibrous activated carbon. 13. The facepiece mask according to claim 11, wherein at least one of the other fibrous materials contains an adsorbent having deodorizing activity or is coated with the adsorbent.