KR102274900B1 - Renewable mask - Google Patents

Abstract

outer surface layer; an external photocatalytic filter layer; a first internal photocatalytic filter layer; a second internal photocatalytic filter layer; and an inner surface layer; wherein the external photocatalytic filter layer includes a first porous substrate layer and an external photocatalyst layer, the first internal photocatalytic filter layer includes a second porous substrate layer and a first internal photocatalyst layer, the second internal photocatalytic filter layer comprises a third porous substrate layer and a second internal photocatalyst layer, the external photocatalyst layer, the first internal photocatalyst layer and the second internal photocatalyst layer include a photocatalyst, and the second porous substrate layer further comprises activated carbon It provides a reproducible mask in which the average diameter of the pores of the third porous substrate layer is smaller than the average diameter of the pores of the second porous substrate layer.

Description

RENEWABLE MASK

It relates to a recyclable mask.

It is true that medical masks cannot be reused, and the risk of infection due to masks is high for medical staff who must continuously wear masks during work hours. If you have to use a mask all day, it is very cumbersome to use a disposable mask and replace it every day, and if used without replacement, it can have a harmful effect on the human body. to be. In addition, since medical masks are disposable, the reality is that hospital operators are paying a hefty cost to purchase masks.

One embodiment of the present invention provides a reproducible reusable mask that can effectively block harmful substances and fine dust while having deodorizing, antibacterial, and antiviral functions, and can be regenerated and reused.

In one embodiment of the present invention, the outer surface layer; an external photocatalytic filter layer; a first internal photocatalytic filter layer; a second internal photocatalytic filter layer; and an inner surface layer; wherein the external photocatalytic filter layer includes a first porous substrate layer and an external photocatalyst layer, the first internal photocatalytic filter layer includes a second porous substrate layer and a first internal photocatalyst layer, the second internal photocatalytic filter layer comprises a third porous substrate layer and a second internal photocatalyst layer, the external photocatalyst layer, the first internal photocatalyst layer and the second internal photocatalyst layer include a photocatalyst, and the second porous substrate layer further comprises activated carbon It provides a reproducible mask in which the average diameter of the pores of the third porous substrate layer is smaller than the average diameter of the pores of the second porous substrate layer.

The reproducible mask can effectively block harmful substances and fine dust while having deodorizing, antibacterial, and antiviral functions, and in particular, it can be reused without having to be replaced every day because it can be regenerated by decomposing harmful substances using visible light . The recyclable mask can be used more safely than a conventional mask because it is necessary to purchase a large amount of the existing mask to reduce the cost compared to the disposable mask, and the adsorbed harmful substances are decomposed in real time. Therefore, the recyclable mask is very useful for medical personnel who need to wear a mask continuously during work.

1 is a schematic cross-sectional view of a renewable mask according to an embodiment of the present invention;
2 is a schematic cross-sectional view of the recyclable mask manufactured in Example 1. FIG.
3 is a graph showing the results of evaluating the acetaldehyde removal performance according to the number of uses for the reproducible mask prepared in Example 1.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly explain the present invention, parts irrelevant to the description are omitted, and the same reference numerals are given to the same or similar elements throughout the specification.

In order to clearly express various layers and regions in the drawings, the thicknesses are enlarged. And in the drawings, for convenience of description, the thickness of some layers and regions are exaggerated.

Hereinafter, the formation of an arbitrary configuration on the “top (or bottom)” or “top (or bottom)” of the substrate means that any configuration is formed in contact with the top (or bottom) surface of the substrate. However, it is not intended to limit the inclusion of other features between the substrate and any features formed on (or under) the substrate.

In one embodiment of the present invention, the outer surface layer; an external photocatalytic filter layer; a first internal photocatalytic filter layer; a second internal photocatalytic filter layer; and an inner surface layer; provides a reproducible mask comprising.

The external photocatalytic filter layer includes a first porous substrate layer and an external photocatalyst layer, the first internal photocatalytic filter layer includes a second porous substrate layer and a first internal photocatalyst layer, and the second internal photocatalytic filter layer includes a third porous layer. It includes a base layer and a second internal photocatalyst layer.

The outer photocatalyst layer, the first inner photocatalyst layer, and the second inner photocatalyst layer include a photocatalyst.

The second porous substrate layer further includes activated carbon, and the average diameter of the pores of the third porous substrate layer is smaller than the average diameter of the pores of the second porous substrate layer.

The reproducible mask can effectively block harmful substances and fine dust while having deodorizing, antibacterial, and antiviral functions, and in particular, it can be reused without having to be replaced every day because it can be regenerated by decomposing harmful substances using visible light . The recyclable mask can be used more safely than a conventional mask because it is necessary to purchase a large amount of the existing mask to reduce the cost compared to the disposable mask, and the adsorbed harmful substances are decomposed in real time. Therefore, the recyclable mask is very useful for medical personnel who need to wear a mask continuously during work.

1 is a cross-sectional view of a reproducible mask 100 in one embodiment of the present invention. The reproducible mask 100 comprises a sequentially stacked, outer surface layer 10; an external photocatalytic filter layer (20); a first internal photocatalytic filter layer 30; a second internal photocatalytic filter layer 40; and an inner surface layer 50;

2 is a schematic cross-sectional view of a renewable mask 200 according to another embodiment of the present invention.

The reproducible masks 100 and 200 can effectively adsorb harmful substances and effectively block fine dust.

Since the reproducible masks 100 and 200 contain a photocatalyst, various harmful substances collected in the mask are decomposed by light and can be regenerated.

The reproducible mask 100 , 200 is suitable for application as a medical mask. For example, it can be usefully used as a mask necessary for medical staff who must continuously wear a mask to prevent dust, fungal or viral infection occurring during dental procedures.

The photocatalyst may include visible light activated photocatalyst particles.

The visible light active photocatalyst particles generate peroxide anions or hydroxy radicals by electrons and holes generated from energy obtained by absorbing light in the visible region, and they decompose and remove harmful substances to clean the air, deodorize or antibacterial. can be performed.

Specifically, the visible light active photocatalyst particles may include a metal oxide and metal particles, and the metal particles may be photo-deposited on the surface of the metal oxide.

For example, the metal oxide may include one selected from the group consisting of titanium oxide, tungsten oxide, zinc oxide, niobium oxide, and combinations thereof. For example, the metal oxide may include tungsten oxide, and the tungsten oxide reacts in visible light to exhibit excellent photocatalytic properties, and has advantages of low price.

In addition, the metal particle is a metal having photoactivity with respect to visible light, and may include, for example, a transition metal or a noble metal.

Specifically, the metal particles of the visible light active photocatalyst particles are tungsten, chromium, vanadium, molybdenum, copper, iron, cobalt, manganese, nickel, platinum, gold, silver, cerium, cadnium, zinc, magnesium, calcium, strontium, It may include one selected from the group consisting of barium and combinations thereof. For example, the metal particles may include platinum, and in this case, the advantage of exhibiting the highest photocatalytic performance may be obtained.

The metal oxide and the metal particles are spherical particles, respectively, and the 'spherical particle' does not mean a particle having a mathematically perfect spherical shape, but a particle whose projected image is the same as or similar to a circle or an ellipse. .

Each of the metal oxide and the metal particle may be a spherical particle, and the visible light active photocatalyst particle may have a shape in which spherical metal particles are deposited on a surface of the spherical metal oxide particle.

The metal particles may have a particle diameter of several nanometers (nm), for example, about 3 nm to about 5 nm. The particle diameter of the metal particles is very small compared to the particle diameter of the metal oxide, and when the metal particles have a particle diameter in the above range, they are photo-deposited in an appropriate amount on the surface of the metal oxide to exhibit excellent photocatalytic activity.

The visible light active photocatalyst particles may have an average particle diameter of about 1 μm or less, specifically, about 0.4 μm to about 1 μm, for example, about 0.6 μm to about 0.7 μm. The average particle diameter of the visible light-activated photocatalyst particles may be obtained by measuring the 4wt% aqueous dispersion of the photocatalyst with a particle size analyzer.

When the particle size of the visible light-activated photocatalyst particles satisfies the above range, high adhesion to the surface of the porous substrate layer, for example, the porous substrate layer formed of fibers can be secured, and a degree of dispersion suitable for the surface of the porous substrate layer It can be dispersed while having an excellent photocatalytic activity. In addition, since the visible light-activated photocatalyst particles have a particle size in the above range, for example, when the porous substrate layer is a nonwoven fabric in which fibers are entangled, it may be evenly distributed between the fibers in the nonwoven fabric.

Considering that the particle size of the metal particles is much smaller than that of the metal oxide, the size of the visible light active photocatalyst particles, that is, the particle size of the visible light active photocatalyst particles, is to be understood to be mainly determined by the particle size of the metal oxide. can That is, when the visible light active photocatalyst particles have a particle size in the above range, the metal oxide of the visible light active photocatalyst particles has a particle size within the error range of several nanometers (nm) in the above range, for example, about 3 nm to about 5 nm. can have In this case, the amount of metal particles photo-deposited on the surface of the metal oxide may be sufficient, and excellent catalytic activity efficiency may be exhibited.

The visible light active photocatalyst particles may include from about 0.1 to about 5 parts by weight of the metal particles based on 100 parts by weight of the metal oxide, for example, from about 0.1 to about 2 parts by weight, for example , about 0.1 to about 0.5 parts by weight may be included. By including the metal particles in the content of the visible light active photocatalyst particles in the above range, it is possible to contain metal particles stably photo-deposited on the surface of the metal oxide, and when the porous substrate layer is a nonwoven fabric, the fibers and the rigidity within the nonwoven fabric can be combined In addition, it is possible to implement excellent performance for the price.

The outer photocatalyst layer 20b, the first inner photocatalyst layer 30b, and the second inner photocatalyst layer 40b each include visible light active photocatalyst particles, so that about 400 nm to about 800 nm of the visible light region Catalytic activity may be exhibited by the light source. That is, the reproducible masks 100 and 200 may exhibit excellent catalytic activity without a separate light source indoors.

The outer surface layer 10, the inner surface layer 50, the first porous substrate layer (20a), the second porous substrate layer (30a) and the third porous substrate layer (40a) are each independently, the fiber It may be a nonwoven fabric comprising a, and the fibers may include organic fibers or inorganic fibers.

The organic fibers may include, for example, one selected from the group consisting of polypropylene (PP) fibers, polyethylene terephthalate (PET) fibers, polyester fibers, polyethylene (PE) fibers, and combinations thereof.

The inorganic fibers may include, for example, one selected from the group consisting of glass fibers, ceramic fibers, carbon fibers, and combinations thereof.

The organic fiber and the inorganic fiber may have a cross-sectional diameter of about 0.5 μm to about 15 μm, for example, about 0.5 μm to about 5 μm, for example, about 0.5 μm to about 2.5 μm. can be

In one embodiment, the fiber may have a cross-sectional diameter of about 0.5 μm to about 2 μm. Further, in another embodiment, the fiber has a cross-section diameter of about 1 μm to about 5 μm, for example, about 2 μm to about 4 μm, and a first fiber having a cross-section diameter of about 10 μm to about 15 μm. , for example, may be in the form of a mixture of the second fibers of about 12㎛ to about 13㎛.

Since the nonwoven fabric includes organic fibers and/or inorganic fibers having a cross-sectional diameter in the above range, dispersibility and adhesion of visible light active photocatalyst particles having a particle size in the above range can be improved, and the photocatalytic functional nonwoven fabric is applied The final product can realize excellent durability. In addition, since the thickness of the fiber satisfies the above range, the outer photocatalyst layer 20b, the first inner photocatalyst layer 30b, and the second inner photocatalyst layer 40b can be uniformly formed on the nonwoven fabric. have.

As shown in FIG. 1 , the outer surface layer 10 is positioned outside based on the air intake direction (arrow direction in FIG. 1 ). Since air is sucked from the outside to the inside, the arrow direction in FIG. 1 is indicated from the outside to the inside.

The outer surface layer 10 may be a non-woven fabric as described above, for example, may be a hydrophobic non-woven fabric, and in this case, it is more effective in preventing contamination.

The thickness of the outer surface layer 10 may be about 50 μm to about 80 μm, and when the thickness is in the above range, light may pass well into the outer surface layer 10 .

The outer photocatalytic filter layer 20 is located next to the surface nonwoven fabric.

In one embodiment, the external photocatalyst filter layer 20 includes, for example, a nonwoven fabric containing a PET component as the first porous substrate layer 20a, and an external photocatalyst containing the above-described photocatalyst on one surface of the nonwoven fabric. It can be prepared by spray coating the photocatalyst composition for forming the layer 20b to form the external photocatalyst layer 20b.

For example, the photocatalyst composition for forming the external photocatalyst layer 20b may be prepared by mixing a photocatalyst and a binder. The binder may be water, alcohol, TiO ₂ sol, SiO ₂ sol, or the like, but is not limited thereto.

The photocatalyst composition for forming the external photocatalyst layer 20b may include about 1 to about 10 wt% of a photocatalyst. In the case of the above content range, it is suitable for forming the external photocatalyst layer 20b by spray coating by implementing an appropriate viscosity.

For example, the coating amount of the photocatalyst composition for forming the external photocatalyst layer 20b may be 0.5 g/m ² to 2 g/m ² when one layer is coated.

The first internal photocatalyst filter layer 30 may be positioned next to the surface nonwoven fabric and the external photocatalytic filter layer 20, and includes the second porous substrate layer 30a and the first internal photocatalyst layer 30b. . The first internal photocatalyst layer 30b may be formed by coating the photocatalyst composition for forming the first internal photocatalyst layer 30b on one or both surfaces of the second porous substrate layer 30a.

The second porous substrate layer 30a may include activated carbon as described above, and an air cleaning, deodorizing or antibacterial effect may be obtained by the activated carbon.

The reproducible masks 100 and 200 exhibit both the strong adsorption ability of the activated carbon and the decomposition ability of the visible light catalyst at the same time, so that both the filter ability and the regeneration performance for the harmful substances are excellently implemented.

The activated carbon is a porous carbon material including micropores and has very high adsorption properties.

The photocatalyst composition for forming the first internal photocatalyst layer 30b may be sprayed onto the second porous substrate containing the activated carbon by a spraying method, but is not limited thereto.

The photocatalyst composition for forming the first internal photocatalyst layer 30b is applied to the porous substrate containing the activated carbon to achieve excellent adhesion without including a binder material, and at the same time to rapidly absorb and It has the advantage that it can be dried.

The second porous substrate layer 30a may include about 20 to about 80% by weight of the activated carbon. By including the content within the above range, the photocatalyst composition for forming the first internal photocatalyst layer 30b is adhered to an excellent level while sufficiently adsorbing harmful substances in the air, and the cost may not be excessively increased.

For example, the photocatalyst composition for forming the first internal photocatalyst layer 30b may be prepared by mixing photocatalyst powder and water. The photocatalyst composition for forming the first internal photocatalyst layer 30b may include about 1 to about 10 wt% of a photocatalyst. The activated carbon contained in the second porous substrate layer 30a absorbs water in the photocatalyst composition for forming the first internal photocatalyst layer 30b, so that the first internal photocatalyst layer 30b is the second porous substrate layer without a binder. It can be formed by being well attached to (30a).

For example, the coating amount of the photocatalyst composition for forming the first internal photocatalyst layer 30b may be about 0.5 g/m ² to about 2 g/m ² when one layer is coated.

The method of attaching or impregnating the activated carbon to the second porous substrate layer 30a may be performed according to a method known in the art, for example, drying the porous substrate after immersing the activated carbon-containing composition. or by spraying the activated carbon-containing composition onto the porous substrate by a spray method, but is not limited thereto.

The second porous substrate layer 30a containing the activated carbon may further contain an adsorbent including at least one selected from the group consisting of diatomaceous earth, zeolite, silica gel, starch, bentonite, alumina, and combinations thereof.

The thickness of the second porous substrate layer 30a containing the activated carbon may be about 0.5 mm to about 3.0 mm. The second porous substrate layer 30a containing the activated carbon has a thickness within the above range, thereby exhibiting an air cleaning, deodorizing or antibacterial effect at an excellent level without excessively increasing the thickness of the reproducible masks 100 and 200. can

By making the average diameter of the pores of the third porous substrate layer 40a smaller than the average diameter of the pores of the second porous substrate layer 30a, the second internal photocatalytic filter layer 40 is given a function of blocking fine dust can do. It is mainly suitable for use in dental masks that require dust blocking.

The third porous substrate layer 40a may include pores having an average diameter of about 30 μm to about 150 μm. For the average diameter of the pores, a capillary flow porometer equipment (eg, CFP-1200AEL, Porous Materials Inc.) may be used.

In one embodiment, the third porous substrate layer 40a may be a high efficiency particulate air filter (HEPA) paper (filter medium or media). The HEPA filter paper refers to a filter having the ability to filter out about 99.97% of about 0.3 μm fine particles. Since this HEPA filter is very dense and filters out even very fine particles of fine dust, it is located on the inner surface layer 50 side of the reproducible masks 100 and 200 and is unnecessarily light by the third porous substrate layer 40a. Make sure this is not blocked.

In one embodiment, the second internal photocatalyst layer 40b may be formed by coating the photocatalyst composition for forming the second internal photocatalyst layer 40b on one surface of the third porous substrate layer 40a in the outward direction. . The second internal photocatalyst layer 40b is located on one surface of the third porous substrate layer 40a in the external direction so that light passing through the filter layer in the front reaches and decomposes harmful substances, so that regeneration is possible. In addition, as the photocatalyst is a visible light catalyst, it is possible to catalyze a reaction at room temperature to a certain extent without light, so materials that come into direct contact with the surface of the visible light catalyst can be effectively decomposed even under low light conditions.

The photocatalyst composition for forming the second internal photocatalyst layer 40b may include about 1 to about 10% by weight of a photocatalyst.

The detailed description of the photocatalyst composition for forming the second internal photocatalyst layer 40b is the same as the description of the photocatalyst composition for forming the external photocatalyst layer 20b.

The external photocatalyst layer 20b, the first internal photocatalyst layer 30b, and the second internal photocatalyst layer 40b are each independently about 1 g/m ² to about 3 g/m ² of the photocatalyst. can The photocatalyst in the above content range may be included to extract excellent deodorizing, antibacterial and antiviral functions.

Since the inner surface layer 50 is a part in direct contact with a person's mouth, a nonwoven fabric having a thickness more than twice that of the nonwoven fabric used for the outer surface layer 10 may be used to block contaminants from coming into contact with the human body.

Hereinafter, Examples and Comparative Examples of the present invention will be described. The following examples are only examples of the present invention, and the present invention is not limited to the following examples.

( Example )

Example One

The external photocatalyst filter layer 20 was prepared by coating an aqueous solution in which 4wt% of a visible photocatalyst was dispersed on a PET nonwoven fabric (the first porous substrate layer, 20a) by a spray method. The coating was coated only on the outer surface so that light coming from the outside could meet the visible photocatalyst to form the external photocatalyst layer 20b. The first internal photocatalyst filter layer 30 was spray coated with a 4wt% aqueous visible photocatalyst solution on the nonwoven fabric (the second porous substrate layer, 30a) to which the activated carbon is attached, this time on both sides to maximize the activated carbon regeneration effect by the photocatalyst. to form a first internal photocatalyst layer 30b. The second internal photocatalyst filter layer 40 was spray-coated on the HEPA filter paper (third porous substrate layer, 40a) with 4wt% aqueous solution of the visible photocatalyst only on the outer surface to form a second internal photocatalyst layer 40b.

Each layer of the multilayer structure prepared in this way is prepared in a size of 20cm x 20cm, stacked in order, and folded several times by wrinkling the middle part, and then the edge part is sealed with a sealing machine for pressure and temperature (instant temperature is about 270℃) was added and attached. If you attach rubber bands to both sides, it becomes a renewable mask.

2 is a cross-sectional view of the fabricated multi-layered reproducible mask 200 .

comparative example One

A mask was manufactured except for the visible photocatalytic coating process in Example 1. That is, in FIG. 2 , the outer photocatalyst layer 20b, the first inner photocatalyst layer 30b, and the second inner photocatalyst layer 40b were excluded.

evaluation

Experimental example One

The experimental method was performed by repeated evaluation of the gas bag. The experiment was conducted with a 3L gas bag, the test gas was 50 ppm of acetaldehyde, and the intensity of the light source was 10000 lux. A mask sample cut into 5 cm x 5 cm and attached to the edge of the jig with a fan was placed so that the wind passed by the fan, the jig was placed inside the gas bag, and after sealing again, the internal gas was removed. Here, 3 L of 50 ppm gas of acetaldehyde having an initial concentration was injected, and the concentration was measured again after 1 hour, and the removal rate value was calculated therefrom. In this way, Example 1 in which the visible light catalyst was applied and Comparative Example 1 in which the visible light catalyst was not applied were repeatedly evaluated.

3 shows the results.

It can be seen that the reproducible mask of Example 1 maintains similar acetaldehyde removal performance for a long time during repeated evaluation of 10 times due to the regeneration effect of the visible light catalyst and activated carbon. On the other hand, it can be seen that the mask of Comparative Example 1 to which the visible photocatalyst was not applied was reduced in performance to less than half of the initial removal performance after only 3 times. From this, it can be confirmed that the activated carbon no longer adsorbs harmful gases and loses its performance.

Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims are also presented. It belongs to the scope of the invention.

10: outer surface layer
20: external photocatalyst filter layer
20a: first porous substrate layer
20b: outer photocatalyst layer
30: first internal photocatalytic filter layer
30a: second porous substrate layer
30b: first inner photocatalyst layer
40: second internal photocatalytic filter layer
40a: third porous substrate layer
40b: second inner photocatalyst layer
50: inner surface layer
100, 200: Renewable Mask

Claims (9)

outer surface layer;
an external photocatalytic filter layer;
a first internal photocatalytic filter layer;
a second internal photocatalytic filter layer; and
inner surface layer; including,
The external photocatalyst filter layer includes a first porous substrate layer and an external photocatalyst layer,
The first internal photocatalyst filter layer includes a second porous substrate layer and a first internal photocatalyst layer,
The second internal photocatalytic filter layer includes a third porous substrate layer and a second internal photocatalyst layer,
The outer surface layer, the outer photocatalyst layer, the first porous substrate layer, the first inner photocatalyst layer, the second porous substrate layer, the first inner photocatalyst layer, the second inner photocatalyst layer, the third porous substrate layer and the inner surface layer sequentially comprising ,
The outer photocatalyst layer, the first inner photocatalyst layer, and the second inner photocatalyst layer include a photocatalyst,
The photocatalyst includes visible light active photocatalyst particles including metal oxide particles and metal particles, the metal oxide is tungsten oxide, and the metal is platinum,
The second porous substrate layer further comprises activated carbon,
The average diameter of the pores of the third porous substrate layer is smaller than the average diameter of the pores of the second porous substrate layer,
The second porous substrate layer further comprises an adsorbent comprising at least one selected from the group consisting of diatomaceous earth, zeolite, silica gel, starch, bentonite, alumina, and combinations thereof,
The third porous substrate layer is a HEPA filter (high efficiency particulate air filter) paper,
The thickness of the outer surface layer is 50㎛ to 80㎛,
The thickness of the second porous substrate layer is 0.5 mm to 3.0 mm
Renewable mask.
delete delete delete According to claim 1,
The third porous substrate layer includes pores having an average diameter of 30 μm to 150 μm.
Renewable Mask.
According to claim 1,
The external photocatalyst layer, the first internal photocatalyst layer, and the second internal photocatalyst layer each independently contain 1 to 10 wt% of a photocatalyst,
Renewable Mask.
According to claim 1,
The second porous substrate layer comprises 20 to 80% by weight of the activated carbon
Renewable Mask.
According to claim 1,
The first internal photocatalyst layer does not include a binder
Renewable Mask.
According to claim 1,
The outer surface layer, the inner surface layer, the first porous substrate layer, the second porous substrate layer, and the third porous substrate layer are each independently a nonwoven fabric including organic fibers or inorganic fibers.
Renewable Mask.

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