JP2005124777A - Infection prevention mask - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-performance infection prevention mask having not only a particle filtering property like a mask in compliance with N95 standards but also a function of decomposing and annihilating pathogen caught by and stuck to a mask surface part and preventing redispersion thereof. <P>SOLUTION: This mask composed of a plurality of nonwoven fabric laminated body is so formed that a nonwoven fabric of a surface layer is a polyolefin or polyester nonwoven fabric having a basis weight of 8-200 g/m<SP>2</SP>and its surface is loaded with titanium dioxide apatite photocatalyst of 0.5-10 g/m<SP>2</SP>, and along with the surface nonwoven fabric, a single or a plurality of electrified and meltblown polypropylene nonwoven fabrics are disposed on its inside. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an infection prevention mask, and more particularly to an infection prevention mask effective for preventing and protecting against infections such as influenza virus, coronavirus causing new pneumonia, or tuberculosis bacteria.

Conventional anti-infection mask standards include OSHA (Occupational Safety and Health Administration: based on “Guidelines for Prevention of Tuberculosis Infection in Medical Facilities” by the CDE (Centers for Disease Control and Prevention). There is an N95 standard established by the Bureau of Occupational Safety and Health) that is effective for preventing M. tuberculosis infection. N95 mask approval is provided by the US National Institute of Occupational Safety and Health (National Institute for Occupational Safety and Health).
Wearing this N95 standard compliant mask is recommended and popularized by patients, doctors and caregivers during tuberculosis treatment. Masks that meet this standard have the ability to capture more than 95% of 0.075 micron sodium chloride (NaCl) particles. For coronavirus infections that cause the recently prevalent SARS (Severe Respiratory Syndrome), it has been demonstrated that wearing an N95 compliant mask reduces the risk of infection. For this reason, the World Health Organization (WHO) recommends wearing N95 certified masks when consulting SARS patients.

However, this N95 standard compliant mask only physically collects pathogenic bacteria and viruses as a filter, and does not have a function of killing bacteria and viruses attached to filtration.
However, normal viruses can only survive in the body of parasitic animals, but coronaviruses that cause SARS can survive outside the body, and experiments in Germany have reported that they survived on dry plastic surfaces for two days. (See, for example, Non-Patent Document 1).
Therefore, such a virus becomes very light and small particles (spray nuclei) by evaporating the water in the droplets, and then resprays into the air and becomes infected. Other examples of viral airborne infections include measles and chicken pox.

  Based on the above knowledge, it cannot be said that even if the N95 standard conforming mask is worn, it is not possible to completely prevent re-scattering of pathogens adhering to the mask surface or penetrating infection into the mask. In addition, in order to prevent such osmotic infection, it may be possible to apply a mask with specifications for high-performance filtration, but pressure loss increases, breathing difficulty increases, and the filter size increases, making it comfortable to wear. The problem is that the sex and the convenience of carrying are significantly impaired.

On the other hand, masks impregnated with and carrying a photocatalytic substance such as titanium dioxide (for example, see Patent Documents 1 to 3) are disclosed as masks used for dust prevention, deodorization, and sterilization measures. No high-performance mask has yet been developed that has the function of killing pathogen viruses and preventing re-scattering. Moreover, the titanium dioxide catalyst itself is a free-flowing solid of fine powder (2 to 30 microns), and does not adhere to the nonwoven fabric as it is. For this reason, even if the nonwoven fabric is sprayed or impregnated, there is a drawback that it is easily detached.
Nikkei Newspaper May 11, 2003, 12th edition JP 2000-202052 A JP 2003-19219 A JP 2003-250920 A

  In view of the above problems, the object of the present invention is not only to guarantee the performance of a particle filter such as an N95 standard compliant mask, but also to adsorb pathogens on the mask surface layer, decompose and kill them, and prevent re-scattering and re-poisoning. It is to provide a high-performance infection prevention mask.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have obtained a polypropylene nonwoven fabric, a polypropylene / polyethylene core-sheath composite nonwoven fabric or a polyester nonwoven fabric having a specific basis weight with a specific amount of photocatalyst attached to the mask surface layer portion. Used to adsorb and kill pathogens. In addition, by disposing a melt-blown polypropylene nonwoven fabric that has undergone electrification treatment inside the mask, it is possible to capture invading pathogens with high efficiency and to prevent the infection of each of the surface layer and the nonwoven fabric placed inside. It was found that the risk of infection with pathogens can be significantly reduced by using a mask, and the present invention has been completed.

That is, according to 1st invention of this invention, it is a mask which consists of a laminated body of a some nonwoven fabric, Comprising: The nonwoven fabric of a surface layer is a nonwoven fabric which uses a polyolefin or polyester with a fabric weight of 8-200 g / m < ² > as a raw material. In addition, an infection prevention mask is provided, which is obtained by attaching 0.5 to 10 g / m ^{2 of} titanium dioxide apatite photocatalyst to the surface.

According to a second aspect of the present invention, there is provided an infection prevention mask according to the first aspect, wherein the nonwoven fabric of the surface layer is an SMS or SMMS polypropylene nonwoven fabric having a basis weight of 8 to 30 g / m ^2. Is done.

According to a third aspect of the present invention, there is provided an infection prevention mask according to the first aspect, wherein the nonwoven fabric of the surface layer is a spunbond polypropylene nonwoven fabric having a basis weight of 9 to 100 g / m ^2. The

According to the fourth invention of the present invention, in the first invention, the nonwoven fabric of the surface layer is a thermal bond nonwoven fabric having a weight per unit area of 20 to 200 g / m ² , and the constituent fiber is polyester or constituent fiber. There is provided an infection prevention mask characterized in that the sheath is a composite fiber made of polyethylene and the core is made of polypropylene.

According to a fifth aspect of the present invention, there is provided an infection prevention mask according to the first aspect, wherein the nonwoven fabric of the surface layer is a melt blown polypropylene nonwoven fabric having a basis weight of 5 to 30 g / m ^2. .

According to a sixth invention of the present invention, in any one of the first to fifth inventions, a spunbond polypropylene nonwoven fabric having a basis weight of 10 to 30 g / m ² is provided on the surface layer as a protective layer. An infection prevention mask is provided.

According to the seventh invention of the present invention, in any one of the first to sixth inventions, the inner layer nonwoven fabric may be a single or a plurality of melt blown polypropylene nonwoven fabrics having a weight per unit weight of 10 to 60 g / m ² subjected to charging treatment. An infection prevention mask characterized in that it is used is provided.

According to the eighth invention of the present invention, in any one of the first to seventh inventions, as the reinforcing support layer, a thermal bond polyester nonwoven fabric having a weight per unit weight of 50 to 200 g / m ^{2 on} the inner layer portion of the mask, or There is provided an infection prevention mask characterized in that a composite fiber thermal bond nonwoven fabric in which the sheath of the constituent fiber is made of polyethylene and the core is made of polypropylene is provided.

  According to the ninth invention of the present invention, in any one of the first to eighth inventions, the titanium dioxide apatite photocatalyst is attached to the surface nonwoven fabric by using an emulsion type acrylic resin, SBR resin or silane compound as a binder. An infection prevention mask is provided.

  According to a tenth aspect of the present invention, there is provided the infection prevention mask according to any one of the first to ninth aspects, wherein the shape is a folding type, cup type or flat type.

  The infection prevention mask of the present invention is capable of capturing particulates such as viruses and bacteria that are air-borne or splash-infected with high efficiency, and can kill pathogens that have been filtered and adhered to the surface. Can be greatly reduced.

Hereinafter, the surface layer, the inner layer, the nonwoven fabric of the mouth layer, the photocatalyst, the photocatalyst attachment and the like constituting the mask of the present invention will be described in detail.
1. Layer constituting mask (1) Surface layer The surface layer of the mask of the present invention is a layer that captures fine particles and pathogens, and is a layer that attaches a photocatalyst to kill pathogens, and has a weight per unit area of 9 to 200 g / m. ² polyolefin nonwoven fabric or polyester nonwoven fabric is used.
In addition, the photocatalyst undergoes a photocatalytic reaction when exposed to ultraviolet rays, and a strong oxidizing power appears, thereby killing and degrading the pathogen. Therefore, in order to maximize the photocatalytic effect, the surface layer on the outside air side of the mask is used. It is necessary to attach. When attached to the non-woven fabric on the inner layer side, ultraviolet rays may not reach sufficiently, and the effect of the photocatalyst cannot be maximized.
In addition, pathogens such as SARS, measles, chicken pox, and tuberculosis are sprayed and dried by the patient, such as coughs, sneezes, and sputum, and resprayed into the air as very small particles (spray nuclei). . Therefore, it is important to capture and adsorb droplets (splashes) containing pathogens and droplet nuclei on the mask surface.
The titanium dioxide apatite photocatalyst used in the present invention utilizes bioaffinity in which hydroxyapatite as a constituent component specifically adsorbs a protein or the like, adsorbs a pathogen, and titanium dioxide as one constituent component is Oxidative degradation of organic pathogens.

The resin material used for the nonwoven fabric of the mask of the present invention is a polyolefin such as polyethylene or polypropylene, or a polyester such as polyethylene terephthalate or polybutylene terephthalate.
Moreover, you may use the composite fiber of the said resin. For example, a composite fiber in which the sheath portion of the outer layer is made of polyethylene and the core portion of the inner layer is made of polypropylene can be mentioned. In this composite fiber, for example, as the polyethylene of the sheath portion, any of ultra high molecular weight polyethylene, high density polyethylene, medium density polyethylene, low density polyethylene, ethylene-vinyl acetate copolymer, etc. can be used. Low melting point polyethylene such as polyethylene and ethylene-vinyl acetate copolymer is preferable for reducing the molding temperature of the mask. As the resin constituting the core portion, polypropylene having a melting point 20 ° C. higher than the melting point of polyethylene is preferable. From the same point of view, it is preferable to use a low melting point type polyester fiber because it contributes to lowering the molding temperature of the mask. Such a composite fiber is preferably used for a thermal bond nonwoven fabric described later.

Examples of the nonwoven fabric used for the surface layer of the mask include spunbond / meltblown composite nonwoven fabric (SMS nonwoven fabric), spunbond nonwoven fabric, thermal bond nonwoven fabric, and meltblown nonwoven fabric. The preferred weight of the non-woven fabric varies depending on the non-woven fabric used.
For spunbond / meltblown composite nonwoven fabric, preferably 8~30g / ^{m 2,} more preferably from 15 to 20 g / ^{m 2.} For spunbonded nonwoven fabric, preferably 9~100g / ^{m 2,} more preferably from 20 to 70 g / ^{m 2.} In the case of a thermal bond nonwoven fabric, 20-200 g / m < ² > is preferable, More preferably, it is 50-150 g / m < ² >. In the case of a melt blown nonwoven fabric, 5-30 g / m < ² > is preferable, More preferably, it is 10-20 g / m < ² >.
In each non-woven fabric, if the weight per unit area is less than the lower limit, stable production is difficult in terms of unevenness of fiber dispersion and winding strength, and if it exceeds the upper limit, ventilation resistance increases, and preferable performance as a mask. Out of range.

In the present invention, a polypropylene spunbond / meltblown composite nonwoven fabric, a polypropylene spunbond nonwoven fabric, a polyester thermal bond nonwoven fabric, a thermal bond nonwoven fabric made of a composite fiber of which the sheath is polyethylene and the core is polypropylene, and a polypropylene meltblown nonwoven fabric Particularly preferred is a spunbond / meltblown composite nonwoven fabric.
The spunbond / meltblown composite nonwoven fabric that can be preferably used in the present invention is a laminated multilayer nonwoven fabric obtained by laminating a spunbond nonwoven fabric (S) and a meltblown nonwoven fabric (M), and both the nonwoven fabrics are multilayered. Any combination may be used as long as they are laminated. For example, it can be expressed as a non-woven fabric laminate having an SM structure in which an S layer made of a spunbonded non-woven fabric and an M layer made of a melt blown non-woven fabric are combined, and the SM structure may be repeated. Specifically, it can be expressed as a laminated and integrated composite nonwoven fabric having an aspect such as an SM structure, an SMS structure, an SMMS structure, and an SMSM structure.

  In the present invention, the non-woven fabric having the SMS or SMMS structure is particularly preferable as the non-woven fabric used for the surface layer. In comparison of the same weight per unit area, the fiber dispersion is more uniform and the water pressure resistance is higher than that of the spunbond nonwoven fabric or the thermal bond nonwoven fabric. This is because the barrier property of the splash is high. That is, as described above, the polypropylene SMS or SMMS nonwoven fabric is formed by alternately laminating the spunbond nonwoven fabric and the melt blown nonwoven fabric and performing point fusion with hot embossing, and the spunbond layer has a fiber diameter of 10 to 30 μm. The strength is high and the meltblown layer is composed of fibers having a low fiber strength but a thin fiber diameter of 2 to 9 μm, and therefore has the ability to improve the uniformity and water pressure resistance of the fibers. Accordingly, since the photocatalyst to be attached is uniformly attached according to the uniform dispersion of the meltblown fibers, a high-rate photocatalytic function can be obtained. Moreover, since a spunbond nonwoven fabric is present on the outer side of the dispersion, it is preferable because it is resistant to rubbing and wear during use.

  The method for producing the spunbond / meltblown composite nonwoven fabric is not particularly limited as long as the spunbond nonwoven fabric and the meltblown nonwoven fabric can be laminated and integrated to form a laminate. For example, after forming a meltblown nonwoven fabric directly on a spunbonded nonwoven fabric, a method of fusing the spunbonded nonwoven fabric and the meltblown nonwoven fabric, overlaying the spunbond nonwoven fabric and the meltblown nonwoven fabric, and fusing both nonwoven fabrics by heat and pressure For example, a method of adhering a spunbonded nonwoven fabric and a meltblown nonwoven fabric with an adhesive such as a hot melt adhesive or a solvent-based adhesive can be used. The method of fusing the spunbonded nonwoven fabric and the meltblown nonwoven fabric after forming the film is most suitable.

  As a method of forming a melt blown nonwoven fabric directly on a spunbond nonwoven fabric, it can be performed by a method in which fibers formed by meltblowing are directly deposited on a spunbond nonwoven fabric to form a meltblown nonwoven fabric. On the other hand, by applying negative pressure to the side opposite to the side on which the fibrous material is sprayed and depositing fibers formed by melt blowing, a spunbond nonwoven fabric and melt blown nonwoven fabric are integrated to obtain a SM structure nonwoven fabric. . On the working belt, first, a spunbond nonwoven fabric layer is formed, then a meltblown nonwoven fabric layer is formed, and finally another spunbond nonwoven fabric layer is continuously deposited to obtain a nonwoven fabric having an SMS structure. Similarly, composite nonwoven fabrics such as an SMMS structure and an SMSM structure can be formed by repeating the combination of spunbond and meltblowing. These are all preferably subjected to a process of integration after forming the web with a heat-pressed embossing roll or the like.

As described above, the spunbond / meltblown composite nonwoven fabric obtained by direct continuous integration has properties that cannot be obtained with a composite nonwoven fabric that is formed by laminating and integrating each nonwoven fabric separately. That is, melt blown nonwoven fabrics having a low weight per unit area of about 1 to 4 g / m ² are generally very weak in strength, and cannot be wound up or processed such as being superposed. It can be formed by laminating on top. The spunbond / meltblown composite nonwoven fabric obtained by direct continuous integration has an ultrathin meltblown nonwoven fabric laminated on the spunbond nonwoven fabric in a state where the ultrafine fibers obtained by meltblowing are entangled with the spunbond nonwoven fabric. The nonwoven fabric has a density that changes in the thickness direction, and the dispersion covering property of the fibers of the entire surface layer nonwoven fabric is improved by being combined with the melt blown nonwoven fabric, and the water pressure resistance is dramatically improved.

In the spunbond nonwoven fabric part in the composite nonwoven fabric used by this invention, the average fiber diameter becomes like this. Preferably it is 10-30 micrometers. The total weight per unit area of the spunbond layers is preferably 8 to 30 g / m ² . Those having an average fiber diameter of less than 10 μm are difficult to produce due to the characteristics of the production method, and are not realistic. On the other hand, if the thickness exceeds 30 μm, the number of constituent fibers is reduced, resulting in uneven dispersion of the fibers. When the total weight per unit area is less than 8 g / m ² , the strength is lowered, and the tensile strength withstanding the processing is insufficient in pasting with the supporting base nonwoven fabric in the subsequent step. On the other hand, even if it exceeds 30 g / m ² , the collection efficiency does not improve so much, the pressure loss increases unnecessarily, and becomes impractical.

Moreover, in the melt blown nonwoven fabric part in the composite nonwoven fabric used by this invention, the average fiber diameter becomes like this. Preferably it is 2-8 micrometers. The total basis weight of the melt blow layer is preferably 2 to 6 g / m ² . When the average fiber diameter is less than 2 μm, the air permeability decreases (pressure loss increases) and the fine particles are clogged quickly. Further, when the total weight per unit area is less than 2 g / m ² , the water pressure resistance decreases, and when it exceeds 6 g / m ² , the pressure loss increases and the air permeability decreases.

Moreover, a protective layer can be provided on the surface layer of the mask of the present invention, if necessary. The protective layer is a layer provided to fulfill the function of preventing the photocatalyst attached to the surface of the surface layer from dropping off. In particular, when a melt-blown nonwoven fabric is used as the surface layer, the fiber strength is low, so that the fiber is likely to be detached or rubbed due to rubbing or abrasion during use. Therefore, it is preferable to use a protective layer.
The protective layer is preferably a spunbond polypropylene nonwoven fabric that is resistant to rubbing and the like. As for the fabric weight of the nonwoven fabric used for a protective layer, 10-30 g / m < ² > is preferable. If it is less than 10 g / m ² , the density of the fibers is small and the coverability as a protective layer is insufficient. When it exceeds 30 g / m ² , the light blocking property increases, the light is not sufficiently applied to the internal photocatalyst, and the ventilation resistance increases.

(2) Inner layer The non-woven fabric constituting the inner layer of the mask of the present invention can be selected to meet various mask standards in terms of the balance of pressure loss and NaCl particle collection efficiency as a whole mask, especially low pressure loss and high collection. A melt-blown polypropylene nonwoven fabric having an efficient mask performance and subjected to charging treatment is suitable. One or more of these nonwoven fabrics are stacked and installed.

As the melt blown polypropylene nonwoven fabric used for the inner layer, the average fiber diameter of the constituent fibers is ² to 8 μm, the basis weight of the nonwoven fabric is 10 to 60 g / m ² , and the bulk density obtained by dividing the basis weight by the thickness is 0.05 to 0.15 g. A non-woven fabric of / m ³ is selected. One or more of these nonwoven fabrics are laminated to form a mask structure. The non-woven fabric to be laminated may be a laminate in which two or more types of non-woven fabrics having different basis weights are combined, or a laminate in which non-woven fabrics having the same basis weight are combined, and those having different bulk densities are combined. May be. For example, the total basis weight weight Taking the case of a 60 g / ^{m 2} as an example, a combination two of 30 g / ^m 1 sheet ² of nonwoven fabric and 15 g / ^{m 2} nonwoven fabric was a two nonwoven 30 g / ^{m 2} Or a combination of three nonwoven fabrics of 20 g / m ² can be used in any combination such that the whole is 60 g / m ² .

  Moreover, in order to improve the function which collects microparticles | fine-particles, the melt blown nonwoven fabric used for an inner layer uses what was electret-ized. The electretized non-woven fabric is used because fine dust can be efficiently collected by electrostatic force, and this electretization is obtained by a corona discharge treatment method.

Furthermore, a reinforcing support layer can be provided on the inner layer as needed in order to improve the rigidity of the mask, maintain the shape of the mask during use, and prevent deformation such as sag. The reinforcing support layer is preferably a thermal bond non-woven fabric based on short fibers having a weight per unit area of 50 to 200 g / m ² and a fiber diameter of 2 to 10 dtex, in particular, a thermal bond polyester non-woven fabric or a sheath portion of constituent fibers is polyethylene, A thermal bond nonwoven fabric of composite fibers whose core part is made of polypropylene is preferable.
The position where the reinforcing support layer is provided may be any position between the surface layer and the inner layer, between the inner layer and the inner layer, or between the inner layer and the mouth layer.

(3) Mouth layer The non-woven fabric constituting the mouth layer of the mask of the present invention is a non-woven fabric for directly touching the skin and preventing the inner layer from touching the skin directly, and used in a normal mask. Any non-woven fabric may be used, but a spunbond polypropylene non-woven fabric that is less prone to fluff or a thermal bond non-woven fabric made of polyester or polyethylene / polypropylene core-sheath fiber is preferred. Moreover, a rayon nonwoven fabric and a cellulose nonwoven fabric may be sufficient. The weight per unit area is not particularly limited as long as the air permeability is not impaired.

2. Photocatalyst The photocatalyst added to the surface layer in the present invention is titanium dioxide apatite obtained by synthesizing or coating titanium dioxide and hydroxyapatite. The apatite component uses bioaffinity that specifically adsorbs proteins and the like. Adsorbs pathogens, and one component, titanium dioxide, oxidizes and decomposes organic pathogens. It is a highly photocatalyst.
In the photocatalyst used in the present invention, the titanium dioxide component generates radicals when exposed to ultraviolet rays, and of course decomposes and detoxifies pathogens by this oxidizing power. However, when the ultraviolet rays are not sufficiently irradiated (nighttime) However, since it has a function of adsorbing pathogens by adsorbing apatite components, the risk of infection of pathogens can be significantly reduced by both functions. In the present invention, it is particularly preferable to use a photocatalyst having such an adsorption function.
Here, so-called muskmelon type photocatalysts in which titanium dioxide is coated with porous silica, like many chemical or natural antibacterial agents, do not have an adsorbing effect, and thus can be said to have insufficient infection prevention functions.

  The method for attaching the photocatalyst to the non-woven fabric is not particularly limited as long as it is a method that does not easily drop off, but an attaching method using a binder is preferable. As the binder, an aqueous dispersion obtained by emulsifying acrylic resin or styrene-butadiene rubber (SBR resin) is used for the photocatalyst addition. Alternatively, a silane compound may be used for the binder. After the photocatalyst is dispersed in water containing the binder, the photocatalyst is firmly fixed on the nonwoven fabric by impregnating the nonwoven fabric and drying at high temperature.

In the mask of the present invention, the adhesion amount of the surface layer nonwoven of the photocatalyst is preferably 0.5 to 10 g / ^{m 2,} more preferably from 2 to 6 g / ^{m 2.} If the amount of photocatalyst attached is less than 0.5 g / m ² , the ability of the photocatalyst is poor and the pathogen cannot be killed, and if it exceeds 10 g / m ² , the effect of increasing the amount does not appear so much. The pressure loss is increased, which is not preferable for the mask performance.

3. Mask Shape The mask of the present invention is a half mask covering a part of the face, and its effective area is about 100 to 250 m ² , and the shape may be any of a folding type, a cup type, and a flat type.
Further, in each shape of the mask, in the filter test measured under an air flow rate containing 85 liters / min of NaCl particles by appropriately selecting the specifications and number of the melt blown nonwoven fabric described in the inner layer, the pressure 95% or more of NaCl particles with a loss of 25 mmAq or less and a CMD (Count Medium Diameter) of 0.075 microns are collected. N95 standard established by NIOSH (National Institute of Occupational Safety and Health) Satisfied.
Furthermore, even as a mask that satisfies the Japanese standards DS1 and DS2 and the European standards PP1 and PP2, the structure of the meltblown nonwoven fabric used for the inner layer can be coped with by appropriately selecting the specifications and number of the meltblown nonwoven fabric described in the inner layer. .

  EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to only the examples. In addition, the test method used by the Example and the comparative example and the nonwoven fabric material used are as follows.

1. Test method (1) Weight per unit area of non-woven fabric: A test piece of 100 × 100 mm was taken from the sample length direction, the weight in a moisture equilibrium state was measured, and calculated per 1 m ² .
(2) Average fiber diameter of non-woven fabric: Take five photographs with an electron microscope at any five locations on the test piece, measure the diameter of 20 fibers per photograph, and perform these five photographs. A total of 100 fiber diameters were averaged.
(3) Air permeability of nonwoven fabric: 100 × 100 mm test specimens were collected from the sample length direction, and measured using a Frazier type tester in accordance with JIS L 1096.
(4) Nonwoven fabric thickness: 100 × 100 mm test pieces were taken from the sample length direction and measured with a dial thickness gauge.
(5) Photocatalytic ability: A part of the mask was cut out and sampled, and the effect was determined by the following liquid phase film adhesion method established by the Photocatalyst Product Technical Council.
Test liquid: 10ppm methylene blue 0.1ml
Covering film: 50 μm, 30 mm square LDPE film Ultraviolet intensity: 1 mW / cm ² (using two 20 W black lights)
Operation: 0.1 ml of the test solution is dropped on the surface of the sample, and the test solution is spread evenly by covering with a coating film. Irradiate ultraviolet rays, and visually confirm the decolored state of the test solution after the elapsed time.
Effect determination: If decolorization is observed within 2 hours of ultraviolet irradiation, it is determined that the photocatalytic ability is present.
(6) Pressure loss, collection efficiency: A mask is attached to a TSI 8130 type filter tester, and air containing NaCl particles of CMD = 0.075 μm is flowed under the condition of 85 liters / minute to increase the collection efficiency of NaCl particles. Measured. At the same time, pressure loss was measured.

2. Material (1) Photocatalyst The photocatalyst used was a dispersion of titanium dioxide and calcium hydroxyapatite dispersed in water. A part of calcium element constituting apatite is substituted with titanium oxide, and the content thereof is as follows.
Hydroxyapatite 3Ca ₃ (PO ₄ ) ₂ · Ca (OH) ₂ 15 to 25% by weight
Titanium dioxide TiO ₂ 0.2-2% by weight
Nonionic surfactants 2 wt% or less of water H ₂ O 75-85 wt%
The nonwoven fabric was mixed with the above acrylic polymer compound as a binder to ensure attachment to the nonwoven fabric.
(2) SMS nonwoven fabric Material: Polypropylene Weight per unit area: 18 g / m ²
Composition breakdown: spunbond layer (fiber diameter: 15 μm, basis weight: 7.5 g / m ² ) / melt blow layer (fiber diameter: 3 μm, basis weight: 3 g / m ² ) / spunbond layer (fiber diameter: 15 μm, basis weight: 7 .5 g / m ² )
Water resistance: 100 mAq (conforms to JISL-1092A method)
Surface friction: Good (conforms to JISL-1096H method)
Tensile strength: Vertical 18N / inch, Horizontal 9N / inch
(3) Melt blown nonwoven fabric Material: Polypropylene Weight per unit area: 30 g / m ²
Charging treatment: implemented Air permeability: 30 cc / cm ² / sec
Average fiber diameter: 3 μm
Thickness: 0.39mm
NaCl particle collection efficiency: 84% (measured with a flat sample at an air flow rate of 15 cm / sec.)
Pressure loss: 75 Pa (measurement conditions same as above)
(4) Spunbond nonwoven fabric Material: Polypropylene Weight per unit area: 70 g / m ²
Air permeability: 110 cc / cm ² / sec
Average fiber diameter: 15 μm
Thickness: 0.43mm
(5) Spunbond nonwoven fabric Material: Polypropylene Weight per unit area: 20 g / m ²
Air permeability: 360cc / cm ² / sec
Thickness: 0.21mm
Average fiber diameter: about 15μm
(6) Thermal bond nonwoven fabric Material: Polyester Weight per unit area: 130 g / m ²
Air permeability: 140cc / cm ² / sec
Average fiber diameter: 2 dtex (7) Thermal bond nonwoven fabric Material: Polypropylene (core) / polyethylene (sheath) composite fiber Weight per unit area: 20 g / m ²
Average fiber diameter: 2 dtex (8) Thermal bond nonwoven fabric Material: Polypropylene (core) / polyethylene (sheath) composite fiber Weight per unit area: 75 g / m ²
Average fiber diameter: 2 dtex

(Example 1)
Using an SMS nonwoven fabric (2) with a photocatalyst 4 g / m ² attached as a surface layer, using two melt blown nonwoven fabrics (3) as an inner layer, a thermal bond nonwoven fabric (6) as a mouth layer of the innermost layer, and a folding mask Molded and evaluated. The evaluation results are shown in Table 1.

(Example 2)
Using a spunbond nonwoven fabric (4) with 4 g / m ^{2 of} photocatalyst as a surface layer, ^two meltblown nonwoven fabrics (3) as an inner layer, a spunbond nonwoven fabric (5) as a mouth layer of the innermost layer, and a folding mask Was molded and evaluated. The evaluation results are shown in Table 1.

(Example 3)
Folding mask using thermal bond nonwoven fabric (6) with 4 g / m ^{2 of} photocatalyst as the surface layer, ^two meltblown nonwoven fabrics (3) as the inner layer, and spunbond nonwoven fabric (5) as the mouth layer of the innermost layer Was molded and evaluated. The evaluation results are shown in Table 1.

Example 4
Spun using a bonded nonwoven fabric (5) as a protective layer on the outside of the surface layer, the photocatalyst with 4g / m ² impregnated is brought meltblown nonwoven fabric (3) as a surface layer, using one meltblown nonwoven fabric (3) as an inner layer, the innermost layer of the Using a thermal bond nonwoven fabric (6) as a mouth layer, a foldable mask was formed and evaluated. The evaluation results are shown in Table 1.

(Example 5)
An SMS nonwoven fabric (2) with a photocatalyst of 4 g / m ² attached as a surface layer, a single melt blown nonwoven fabric (3) as an inner layer, a thermal bond nonwoven fabric (7) as an innermost layer, and a flat mask Molded and evaluated. The evaluation results are shown in Table 1.

(Example 6)
A spunbond nonwoven fabric (5) with a photocatalyst 4 g / m ² attached as a surface layer, a thermal bond nonwoven fabric (8) as a reinforcing support layer between the surface layer and the inner layer, and two melt blown nonwoven fabrics (3) as the inner layer Using a thermal bond nonwoven fabric (6) as the innermost lip layer, a cup-shaped mask was molded and evaluated. The evaluation results are shown in Table 1.

(Comparative Example 1)
A foldable mask was formed and evaluated in the same manner as in Example 1 except that the SMS nonwoven fabric (2) in which the photocatalyst was not attached to the nonwoven fabric of the surface layer was used. The evaluation results are shown in Table 1.

(Comparative Example 2)
Using an SMS nonwoven fabric (2) as the surface layer, two meltblown nonwoven fabrics (3) with 4 g / m ^{2 of} photocatalyst attached to the inner layer (inner layer (2) in the table), and a thermal bond nonwoven fabric ( Using 6), a foldable mask was formed and evaluated. The evaluation results are shown in Table 1.

  As is clear from Table 1, the mask with the photocatalyst attached to the surface layer exhibited photocatalytic ability and was excellent in pressure loss and collection efficiency (Examples 1 to 6). On the other hand, a mask in which a photocatalyst is not attached to the surface layer and a meltblown nonwoven fabric is not disposed in the inner layer does not have a photocatalytic ability. (Comparative Example 1). Further, the mask in which the photocatalyst was attached to the melt blown nonwoven fabric of the inner layer was excellent in the collection efficiency, but the photocatalytic ability was not exhibited (Comparative Example 2).

  The infection prevention mask of the present invention is capable of capturing particles with high accuracy, and has a function of adsorbing a pathogen on the surface and decomposing and killing it. It can be used as a mask for the general public for prevention that significantly reduces the risk of infection in public facilities.

Claims (10)

A mask comprising a laminate of a plurality of non-woven fabrics, wherein the non-woven fabric of the surface layer is a non-woven fabric made of polyolefin or polyester having a basis weight of 8 to 200 g / m ² , and titanium dioxide apatite photocatalyst is 0.5 to An infection prevention mask characterized by being attached with 10 g / m ² . Infection mask according to claim 1, the surface layer of the nonwoven fabric, characterized in that it is a SMS or SMMS polypropylene nonwoven having a basis weight 8~30g / ^{m 2.} Infection mask according to claim 1, wherein the surface layer of the nonwoven fabric is a spunbond polypropylene nonwoven having a basis weight 9~100g / m ^2. The surface layer nonwoven fabric is a thermal bond nonwoven fabric having a basis weight of 20 to 200 g / m ² , wherein the constituent fiber is polyester, or the sheath portion of the constituent fiber is a composite fiber made of polyethylene and the core portion is made of polypropylene. The infection prevention mask according to claim 1. Infection mask according to claim 1, wherein the surface layer of the nonwoven fabric, a meltblown polypropylene nonwoven having a basis weight 5 to 30 g / m ^2. The infection prevention mask according to any one of claims 1 to 5, wherein a spunbond polypropylene nonwoven fabric having a basis weight of 10 to 30 g / m ² is provided on the surface layer as a protective layer. The infection prevention mask according to any one of claims 1 to 6, wherein the inner layer non-woven fabric uses one or more melt blown polypropylene non-woven fabrics having a basis weight of 10 to 60 g / m ² subjected to electrification treatment. As a reinforcing support layer, a thermal bond polyester non-woven fabric having a weight per unit weight of 50 to 200 g / m ² or a composite fiber thermal bond non-woven fabric having a sheath of polyethylene and a core made of polypropylene is provided on the inner layer portion of the mask. The infection prevention mask according to any one of claims 1 to 7.   The infection prevention mask according to any one of claims 1 to 8, wherein a titanium dioxide apatite photocatalyst is attached to a surface nonwoven fabric using an emulsion type acrylic resin, an SBR resin or a silane compound as a binder.   The infection prevention mask according to any one of claims 1 to 9, wherein the shape is a folding type, a cup type, or a flat type.