KR20220057131A - Functional Sheet - Google Patents

Abstract

The present invention relates to a functional sheet configured to comprise: a lower substrate; a photocatalyst layer; and an upper substrate layer, wherein the photocatalyst layer and the upper substrate layer are sequentially stacked on a first surface of the lower substrate. The functional sheet further comprises: a pressure-sensitive adhesive layer disposed on a second surface of the lower substrate layer; and a release paper layer attached to the lower surface of the pressure-sensitive adhesive layer. According to the present invention, it is possible to provide a functional sheet with a deodorizing function which is attached to the surface of an article, and which decomposes harmful substances in indoor air such as volatile organic compounds.

Description

Functional Sheet

The present invention relates to a functional sheet.

In general, sheet paper used for interiors, such as residential or commercial, is a surface finishing material and is expressed in various colors and textures to emphasize design elements. However, in modern society, air pollution has become more serious, and as a highly contagious virus has recently appeared, the time spent in an indoor space has increased. Accordingly, there is a demand for interior sheet paper capable of improving the quality of indoor air.

On the other hand, in making indoor air comfortable, deodorization performance is very important. Conventionally, the deodorization performance used a method of adsorbing harmful gases to a material having adsorption properties such as activated carbon. At this time, when it is an air purifier or a filter for an air conditioner that has deodorizing performance, this problem can be easily solved by replacing the filter. However, when it is a sheet paper used for interior decoration to have deodorizing performance, it is somewhat difficult to replace the sheet paper itself, considering the aesthetics of the exterior and ease of construction. Therefore, there is a need for a deodorizing sheet that can be regenerated.

Accordingly, an object of the present invention is to provide a functional sheet that is attached to an adherend to decompose harmful substances such as volatile organic compounds in indoor air and has a deodorizing function. The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

It will be appreciated that when an element, such as a layer, region, or substrate, is referred to as being “on” another component, it may be directly on the other element or intervening elements in between. .

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. In describing the present invention, in order to facilitate the overall understanding, the same reference numerals are used for the same components in the drawings, and duplicate descriptions of the same components are omitted.

In order to achieve the above technical problem, an embodiment of the present invention provides a functional sheet. 1 illustrates a functional sheet according to an embodiment of the present invention.

In one embodiment, the functional sheet according to the present invention sequentially includes a photocatalyst layer 20 and an upper substrate layer 30 on one surface of the lower substrate layer 10, and the photocatalyst layer 20 includes activated carbon and visible light. It may contain an active photocatalyst.

The lower base layer 10 and the upper base layer 30

The lower substrate layer 10 and the upper substrate layer 30 may each include a porous substrate, but is not limited thereto, but the lower substrate layer 10 is made of a nonwoven fabric, a woven fabric, paper, a foam, and a combination thereof. It may include a layer made of a material including at least one selected from the group.

The porosity of the porous substrate may be 50% to 80%. The porous substrate having the porosity may support an appropriate amount of activated carbon and maintain structural strength.

In one example, the lower substrate layer 10 and the upper substrate layer 30 may each include a nonwoven fabric layer. The non-woven fabric layer may be a layer composed of a non-woven fabric, and the fiber-forming resin used to form the non-woven fabric is not limited to those listed below, but may be a fiber formed from an organic fiber or an inorganic fiber, for example, polypropylene-based Resin, aromatic vinyl resin, rubber-modified aromatic vinyl resin, polyphenylene ether resin, polycarbonate resin, polyester resin, methacrylate resin, polyarylene sulfide resin, polyamide resin, poly It may be a fiber formed from a vinyl chloride-based resin, or a polyolefin-based resin. As the nonwoven fabric layer, a wet (short fiber) nonwoven fabric may be used, but it is preferable to use a dry (long fiber) nonwoven fabric to prevent peeling during re-application.

More specifically, the lower substrate layer 10 may include a nonwoven fabric layer having a basis weight of 10 g/m ² to 500 g/m ² , that is, a weight per unit area. In addition, in one example, the basis weight of the lower substrate layer 10 may satisfy a range exceeding one time of the basis weight of the upper substrate layer 30 , and more specifically, 1.1 times or more, 1.2 times or more, 1.3 times or more. or more, 1.4 times or more, 1.5 times or more, 1.6 times or more, 1.65 times or more, 1.7 times or more, or 1.75 times or more may be satisfied. That is, the lower substrate layer 10 has a higher basis weight than the upper substrate layer 30 and is composed of a denser non-woven fabric layer than the upper substrate layer 30 , thereby securing excellent adhesion and maintaining the sheet shape to ensure excellent durability. can promote In addition, as will be described later, a pressure-sensitive adhesive layer 40 is formed on the back surface of the lower substrate layer 10 . At this time, the composition forming the pressure-sensitive adhesive layer 40 penetrates into the lower substrate layer 10 to form the lower substrate layer. By blocking the pores of the activated carbon coated on one side of (10), it is possible to suppress the deterioration of the deodorization performance.

Meanwhile, the upper substrate layer 30 may include a nonwoven fabric layer having a basis weight of 10 g/m ² to 500 g/m ² , that is, a weight per unit area. The functional sheet according to the present invention exhibits antibacterial properties by causing a photoactive reaction of the photocatalyst layer by a light source from the outside, and the light source must be able to penetrate the upper substrate layer 30 to reach the photocatalyst layer. Therefore, as mentioned above, by using a nonwoven fabric layer having a lower basis weight compared to the lower substrate layer 10, light transmittance and air permeability can be secured, thereby exhibiting superior antibacterial performance.

In one example, the thickness of the lower substrate layer 10 may be 50 μm to 500 μm, and the thickness of the upper substrate layer 30 may be 50 μm to 500 μm. By having a thickness in the above range, the thickness of the functional sheet may not be excessively thick. In addition, in one example, the thickness of the lower substrate layer 10 may satisfy a range of one or more times or more than the thickness of the upper substrate layer 30 . That is, by forming the lower substrate layer 10 to be thicker than the upper substrate layer 30 , it is possible to secure adhesion and shape retention with the pressure-sensitive adhesive layer 40 to be described later, thereby having excellent durability.

photocatalyst layer (20)

The photocatalyst layer 20 includes activated carbon and a visible light active photocatalyst, and may serve to remove harmful substances in indoor air. That is, since the photocatalyst layer 20 according to the present invention includes both activated carbon and a visible light active photocatalyst, the functional sheet of the present invention not only adsorbs harmful substances but also removes harmful substances by fundamentally decomposing harmful substances through the photocatalytic composition Furthermore, by using an indoor fluorescent lamp as a light source, the application range of the composition capable of being deodorized with a photocatalyst can be extended, and it can have a long lifespan according to the regeneration of the deodorizing ability.

In one example, the thickness of the photocatalyst layer 20 may be 100 to 800 μm, for example, 200 to 700 μm, or 300 to 500 μm. As the photocatalyst layer 20 has a thickness within the above range, air cleaning, deodorization, or antibacterial properties can be sufficiently implemented.

In one example, the photocatalyst layer 20 is formed by being coated on the lower substrate layer 10 , and activated carbon or visible light active photocatalyst may be coated on the surface or inside of the lower substrate layer 10 . That is, activated carbon or visible light active photocatalyst may be attached to the surface of the lower substrate layer 10 or impregnated inside the lower substrate layer 10 . The coating may be formed according to a known method. For example, a composition containing a visible light active photocatalyst is sprayed onto the lower substrate layer 10 by a spray method, or the lower substrate layer 10 is immersed in the composition. After drying, a method can be used. However, the present invention is not limited thereto.

In one example, the photocatalyst layer 20 may include activated carbon coated with a visible light active photocatalyst. Specifically, the visible light active catalyst material particles may be coated on the surface of the activated carbon particles in the form of an island.

In one example, the photocatalyst layer 20 may include 1 to 20 parts by weight of the visible light active photocatalyst relative to 100 parts by weight of activated carbon. Specifically, the photocatalyst layer 20 may include 1.5 parts by weight or more, 2 parts by weight or more, or 3 parts by weight or more of the visible light active photocatalyst with respect to 100 parts by weight of activated carbon, 19 parts by weight or less, 17 parts by weight or less, 15 parts by weight or less, 13 parts by weight or less, 11 parts by weight or less, 10 parts by weight or less, 9 parts by weight or less, 8 parts by weight or less, 7 parts by weight or less, 6 parts by weight or less, or 5 parts by weight or less. . By including the visible light active catalyst in the content range, the visible light active photocatalyst is coated on the activated carbon to suppress the desorption of the visible light active photocatalyst of the photocatalyst layer, and in addition, the pores of the activated carbon covered by the visible light active photocatalyst are almost covered Therefore, it is possible to maintain an excellent adsorption amount. In addition, it is possible to sufficiently ensure the regeneration of the activated carbon, it is possible to have a long lifespan of the functional sheet according to the present invention.

In one example, the photocatalyst layer 20 may include 50 g/m ² to 500 g/m ² of activated carbon coated with a visible light active photocatalyst.

The activated carbon is a porous carbon material including micropores and has very high adsorption, and as an adsorbent, it may serve to remove harmful gases through adsorbable pores. The structure of the activated carbon is not limited, but as an example, the activated carbon may be of a pellet type or a corrugated type. The activated carbon may be in the form of particles, and the average particle diameter of the activated carbon particles may be 250 μm to 600 μm. The average particle diameter of the particles can be obtained by measuring with a particle size analyzer.

The visible light active photocatalyst may have activity with respect to visible light of a wavelength range of 380 nm to 780 nm, for example, it may exhibit an absorbance of about 20% with respect to visible light of a wavelength of about 400 nm, and a wavelength of about 500 nm It can exhibit an absorbance of about 10% with respect to visible light. In other words, the visible light active photocatalyst material decomposes volatile organic compounds (VOCs) by generating peroxide anions or hydroxy radicals by electrons and holes generated from energy obtained by absorbing visible light to purify air and deodorize. It may be a substance.

Conventionally, UV-activated photocatalysts such as titanium oxide have been mainly used as photocatalysts, and in the case of these UV-activated photocatalysts, the efficiency of the photocatalyst is very low by an indoor light source, so a light source supply device for irradiating separate UV rays is required. However, since the photocatalyst layer according to the present invention includes a visible light active photocatalyst, it is possible to realize visible light activation performance in which the photocatalyst can be activated not only by ultraviolet light but also by visible light. Therefore, the visible light active photocatalyst according to the present invention can exhibit a high level of photocatalytic efficiency indoors without a separate light source supply device.

Specifically, the visible light-activated photocatalyst includes porous metal oxide particles carrying visible light-activated metal, and has an absorption rate for visible light, and can exhibit excellent efficiency even in an indoor light source. The visible light activation metal may be supported on the porous metal oxide by a photo-deposition method, but is not limited thereto, and may be supported by a known method.

The visible light activity imparting metal may be used without limitation as long as it is a metal imparting activity to visible light, and may include at least one selected from the group consisting of transition metals, noble metals, oxides thereof, and combinations thereof. As an example, the visible light activating metal is tungsten, chromium, vanadium, molybdenum, copper, iron, cobalt, manganese, nickel, platinum, gold, cerium, cadnium, zinc, magnesium, calcium, stronitium, barium and radium. It may include at least one selected from the group consisting of, and more specifically, by including at least one selected from the group consisting of platinum, copper, silver, zinc, palladium, and combinations thereof, excellent visible light activity performance can be implemented there is.

The porous metal oxide may be formed into spherical, plate-shaped or needle-shaped particles as a support, for example, by a sol-gel method or a hydrothermal synthesis method, and at least selected from titanium oxide, tungsten oxide, zinc oxide, niobium oxide, and combinations thereof. may contain one.

In one example, the visible light activation-imparting metal and the porous metal oxide may each be spherical particles, and accordingly, the visible light activation photocatalyst may also be formed in the form of particles. Here, the spherical particle does not mean a particle having a mathematically perfect spherical shape, but may mean a particle whose projected image has the same or similar shape as a circle or an ellipse. In addition, the visible light active photocatalyst may have a shape in which a spherical element of a visible light activity-imparting metal is deposited on the outer surface of the spherical porous metal oxide particle or the inner surface of the inner pore.

In one example, an average particle diameter of the visible light activation-imparting metal particles is several nanometers (nm), and may be, for example, about 3 nm to about 5 nm. The particle diameter of the visible light activation imparting metal particles is very small compared to the particle diameter of the porous metal oxide, and the visible light activation imparting metal particles have a particle diameter in the above range, so that an appropriate content is photo-deposited on the surface of the porous metal oxide particles. It can exhibit excellent photocatalytic activity.

In one example, the average particle diameter of the porous metal oxide may be about 30 nm to 1000 nm.

In one example, the average particle diameter of the visible light active photocatalyst particles is about 1 μm or less, specifically, it may be about 0.4 μm to 1 μm, for example, it may be about 0.6 μm to about 0.7 μm. . When the particle size of the visible light-activated photocatalyst particles satisfies the above range, high adhesion to the surface of the lower substrate layer 10 and uniform dispersibility may be secured. In addition, since the visible light-activated photocatalyst particles have a particle diameter within the above range, an exposed area to visible light may be secured to implement sufficient air cleaning and antibacterial functions.

In one example, the content of the visible light activity imparting metal may be included in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the visible light active photocatalyst. By including the visible light activity imparting metal and the porous metal oxide in the above content, the porous metal oxide sufficiently generates electrons and holes by visible light, while the visible light activity imparting metal sufficiently prevents recombination of the generated electrons and holes to increase the photocatalytic activation efficiency can be effectively improved.

In one example, the porous metal oxide may have a porosity of about 5% by volume to 50% by volume, and a specific surface area of about 50 m ² /g to 500 m ² /g. When the porous metal oxide has a porosity and a specific surface area within the above ranges, the photocatalyst can be effectively exposed to the light source, and the porosity can be formed at an appropriate level to sufficiently support the visible light activity imparting metal particles.

For example, the visible light active photocatalyst may be a photocatalyst including tungsten oxide and platinum particles formed on the surface of the tungsten oxide, specifically, tungsten oxide in an amount of 90 wt% to 99.9 wt%, and platinum particles in an amount of 0.1 wt% to It may be included in an amount of 10% by weight.

On the other hand, it is common to use a binder material to coat the catalyst material on activated carbon, but the binder material blocks the pores of the substrate or is attached to the surface of the photocatalyst, thereby reducing the surface activity of the photocatalyst against light. . Therefore, the photocatalyst layer 20 of the present invention may not include a separate binder material. That is, in order to solve the above problem, the present invention coats the visible light active photocatalyst in the photocatalyst layer 20 on the surface of the activated carbon without a separate binder, and accordingly, the surface area of the photocatalyst for light is not reduced. life can be extended.

At the same time, since the visible light active photocatalyst is formed from a composition using an aqueous solvent, it is possible to effectively prevent a decrease in the surface activity of the photocatalyst to extend the life of the product, and to prevent a reaction between the photocatalyst and the solvent, so that it is uniform for a long period of time It has the advantage of realizing good performance and excellent storage stability.

The photocatalyst layer 20 may be attached between the lower substrate layer 10 and the upper substrate layer 30 through separate adhesive layers (not shown). Accordingly, the functional sheet according to the present invention may include the lower substrate layer 10/adhesive layer/photocatalyst layer/adhesive layer/upper substrate layer 30 sequentially. In this way, the photocatalyst layer 20 is laminated between the lower substrate layer 10 and the upper substrate layer 30 via the adhesive layers, so that an integral functional sheet can be formed. At this time, the type of adhesive for forming the adhesive layer is not limited, and a known adhesive may be used, and as an example, a hot melt adhesive may be used.

In another embodiment, the functional sheet according to the present invention may include a pressure-sensitive adhesive layer 40 disposed on the back surface of the lower substrate layer 10 and a release paper layer 50 attached to the lower surface of the pressure-sensitive adhesive layer 40 . there is.

adhesive layer (40)

The pressure-sensitive adhesive layer 40 may be attached to the lower substrate layer 10 after being cured and dried for a predetermined temperature and time in a state of being applied to the release paper layer 50 . The pressure-sensitive adhesive layer 40 is attached to the back surface of the lower substrate layer 10, that is, the lower surface, so that the release paper layer 50 is removed during construction, and then the functional sheet can be simply and simply attached to the adherend. there is.

That is, the functional sheet is distributed in a form prepared including the pressure-sensitive adhesive layer 40 and the release paper layer 50, and then the release paper layer 50 is removed so that the pressure-sensitive adhesive layer 40 is attached to the adherend. Since it can be easily constructed by doing so, excellent flowability and workability can be ensured.

As an example, the pressure-sensitive adhesive layer 40 may use a water-based pressure-sensitive adhesive in terms of environmental friendliness, and may use an oil-based pressure-sensitive adhesive to secure adhesive strength and cold resistance.

release strata (50)

The release paper layer 50 serves to protect the pressure-sensitive adhesive layer 40 from losing the adhesive function to increase the adhesion with the adherend later. By removing the release paper layer 50 from the functional sheet, the pressure-sensitive adhesive layer 40 It can be made to adhere to one side of this adherend.

In one example, the material of the release paper layer 50 is not limited thereto, but the release paper layer 50 may include polyester fibers, polyamide fibers, acrylic fibers, polyolefin fibers, cellulose fibers, and pulp.

As an example, the release paper layer 50 may have a basis weight of 10 to 160 g/m ² , and a thickness thereof may be approximately 0.05 mm to 1 mm.

In addition, the functional sheet may further include a printing layer for imparting a design effect, a surface protection layer for preventing external scratches or damage, and the like, if necessary.

In one example, the functional sheet refers to a sheet or film used as interior materials for interiors such as ceiling materials, wall materials, and flooring materials, and may be used as decorative sheets, wallpaper, flooring materials, and the like.

In addition, the functional sheet can obtain a flame retardant performance. Specifically, the functional sheet according to the present invention can satisfy the after-flame time of 3 seconds or less, the after-life time within 5 seconds, the carbonization area within 30 cm ² , and the carbonization length within 20 cm according to the 45 degree combustion test method. . Here, "afterflame time" means the time from when the flame of the burner is removed until the state of burning with a flame is stopped, and "afterglow time" means from the time when the flame of the burner is removed until the state of burning without raising the flame is stopped time (excluding the time during afterflame), "charging area" means the area carbonized by the flame, and "charring length" means the length carbonized by the flame. In addition, the 45 degree combustion test method is in accordance with Article 6 of the Fire Department Notification No. 2019-2, and can be measured at the Korea Flame Retardant Testing Institute. According to the notification of the Fire and Emergency Management Agency, thin fabrics used for paper, synthetic resin, wallpaper, etc. installed in buildings with 11 or more floors or multi-use establishments, etc., must satisfy the flame-retardant performance. Within 5 seconds, the carbonization area must be within 30 cm ² , and the carbonization length must be within 20 cm. The functional sheet according to the present invention corresponds to a thin fabric having a weight of 1 m ² of 450 g or less, and may satisfy all of the above flame-retardant performance.

A method for manufacturing a functional sheet according to the present invention will be described.

The method for manufacturing a functional sheet according to the present invention may include providing a lower substrate layer, forming a photocatalyst layer on one surface of the lower substrate layer, and laminating an upper substrate layer on the photocatalyst layer. In one example, forming the photocatalyst layer may include scattering activated carbon particles coated with visible light active photocatalyst particles on the upper surface of the lower substrate layer, and the lower substrate layer and the photocatalyst The method may further include forming an adhesive layer between the layers and/or between the photocatalyst layer and the upper substrate layer.

In one example, the method further comprises the step of providing an adhesive layer on the release paper layer, and by plying on the back side of the pre-laminated lower substrate layer, that is, the lower surface, after removing the release paper layer during construction, the functional sheet is conveniently applied to the adherend and make it easy to attach.

As described above, the functional sheet according to embodiments of the present invention may be attached to an adherend to decompose harmful substances such as volatile organic compounds in the indoor air and implement a deodorizing function. However, the effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 shows a functional sheet according to an embodiment of the present invention.
FIG. 2 is a graph showing the amount of VOC detected according to Experimental Example 1. FIG.

Hereinafter, a preferred experimental example (example) is presented to help the understanding of the present invention. However, the following experimental examples are only for helping understanding of the present invention, and the present invention is not limited by the following experimental examples.

[Experimental examples; Examples]

Preparation Example 1

A visible light active photocatalyst composition in which 2.5 wt% of tungsten oxide (WO ₃ ) particles were dispersed in 97.5 wt% of water was prepared. At this time, the tungsten oxide (WO ₃ ) particles had a particle diameter of about 600 nm. A supporting raw material, which is an aqueous solution of chloroplatinic acid (H ₂ PtCl ₆ ), was mixed with the tungsten oxide particle dispersion solution. Then, the first photoreaction was performed by irradiating visible light energy for a certain period of time using a visible light irradiation device, and then, after blocking the visible light irradiation for about 2 minutes and adding methanol, the same irradiation device as the first photoreaction was performed. Pt-WO ₃ visible light active photocatalyst particles were prepared by supporting platinum particles on tungsten oxide particles by performing a secondary photoreaction by irradiating visible light energy for a certain period of time using the tungsten oxide particles.

A slurry was prepared by mixing 10 wt% of the visible light active catalyst material Pt-WO ₃ in 90 wt% of water. At this time, crushed activated carbon having a size of 250 μm to 600 μm was prepared and put in a rotating chamber, and Pt-WO ₃ was 3 parts by weight relative to 100 parts by weight of the activated carbon using a spray nozzle in the center of the chamber. Coating and drying are carried out simultaneously in the chamber, and after the coating and drying are finished, activated carbon particles coated with visible light active catalyst and visible light active photocatalyst Pt-WO ₃ particles in an island shape were prepared.

Preparation 2

It was prepared in the same manner as in Preparation Example 1, except that it was spray-coated so that the amount of Pt-WO ₃ was 9 parts by weight based on 100 parts by weight of the activated carbon.

Example 1

A polypropylene (PP)-based lower nonwoven fabric having a basis weight of 70 g/m ² and a thickness of 200 μm was prepared. A hot melt was applied to the upper surface of the lower nonwoven fabric, and the activated carbon particles coated with the visible light active photocatalyst according to Preparation Example 1 were scattered so that 60 g/m ² was formed thereon, thereby forming a photocatalyst layer having a thickness of about 400 μm. . Next, a hot melt was applied on the photocatalyst layer, that is, the activated carbon coated with a visible light active photocatalyst, and a polypropylene (PP)-based upper nonwoven fabric having a basis weight of 40 g/m ² and a thickness of 200 μm was laminated by thermocompression bonding. .

Next, the adhesive was applied to a PE-coated release paper with a thickness of 20 μm, dried and cured at 120 °C for 3 minutes, and then laminated on the lower surface of the lower nonwoven fabric to prepare a functional sheet.

Example 2

It was prepared in the same manner as in Example 1, except that the activated carbon particles coated with the visible light-activated photocatalyst according to Preparation Example 1 were scattering so as to be 100 g/m ² on the nonwoven fabric.

Example 3

It was prepared in the same manner as in Example 1, except that the activated carbon particles coated with the visible light-activated photocatalyst according to Preparation Example 1 were scattering so as to be 150 g/m ² on the nonwoven fabric.

Example 4

It was prepared in the same manner as in Example 1, except that the visible light active photocatalyst according to Preparation Example 2 was used.

Comparative Example 1

A sheet was prepared in the same manner as in Example 1, except that a separate photocatalyst layer was not included.

Comparative Example 2

A sheet was prepared in the same manner as in Example 1, except that the activated carbon not coated with the visible light active photocatalyst was used instead of the activated carbon particles coated with the visible light active photocatalyst of Preparation Example 1.

Experimental Example 1

After attaching 1 m ² of the sheet according to Example 1 and Comparative Example 1 to a closed space of about 36 m ³ , the mackerel was cooked and the amount of VOC detected immediately after cooking and after 30 minutes was measured. The VOC concentration was analyzed using a gas chromatograph (GC) in the air collected from the TENAX-TA sample collection tube. At this time, the light irradiated to the sheet was 1,000 to 1,500 lux of 400 to 700 nm of LED white light.

2 is a graph showing the amount of VOC detected according to Experimental Example 1.

Experimental Example 2

The hydrogen sulfide removal performance was evaluated using the sheets according to Examples 1 to 3. For evaluation, put 5.5 cm * 5.5 cm of sheets according to Examples and Comparative Examples in a 3L gas-bag, seal and inject 3L of 2.5 ppm hydrogen sulfide, and then inspect the gas before injection and the detection tube for each time after injection. This was done by measuring the hydrogen sulfide concentration in the gas bag using the At this time, the light irradiated to the sheet was 500 lux of 400 to 700 nm LED white light.

Table 1 below summarizes the time taken to remove 100% of hydrogen sulfide according to Experimental Example 2.

Example 1 Example 2 Example 3 100% hydrogen sulfide removal time (min) 35 20 10

Experimental Example 3

The acetaldehyde removal performance was evaluated using the sheets of Examples 1 and 4 and Comparative Example 2. For evaluation, put 3.5 cm * 3.5 cm of the sheet according to Examples and Comparative Example 2 into a 3L gas-bag, seal, and inject 3L of 10 ppm hydrogen sulfide, and then the gas before injection and the detection tube for each time lapse after injection This was done by measuring the hydrogen sulfide concentration in the gas bag using At this time, the light irradiated to the sheet was continued for 30 minutes at a time of 400 to 700 nm LED white light at 500 lux, and this experiment was repeated several times.

Table 2 below summarizes the number of experiments performed until the acetaldehyde gas removal rate of the sheets according to Examples to Comparative Example 2 according to Experimental Example 3 fell to 50% or less.

Example 1 Example 4 Comparative Example 2 Number of replicates (times) 17 38 6

According to Experimental Example 3 and Table 2, it can be confirmed that, unlike Comparative Example 2, the functional sheet according to the embodiment can implement a long lifespan by ensuring the regeneration of activated carbon.

Although it has been described with reference to the above embodiments, it will be understood by those skilled in the art that various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. will be able

Claims (15)

A photocatalyst layer and an upper substrate layer are sequentially included on one surface of the lower substrate layer,
The photocatalyst layer is a functional sheet comprising activated carbon and a visible light active photocatalyst. A functional sheet comprising a pressure-sensitive adhesive layer disposed on the back surface of the lower substrate layer and a release paper layer attached to the lower surface of the pressure-sensitive adhesive layer. The method of claim 1,
The lower base layer and the upper base layer each include a nonwoven fabric layer having a basis weight of 10 g/m ² to 500 g/m ² A functional sheet. 4. The method of claim 3,
The basis weight of the lower substrate layer is a functional sheet that satisfies a range exceeding one time the basis weight of the upper substrate layer. The method of claim 1,
The thickness of the lower substrate layer and the upper substrate layer is 50 μm to 500 μm, respectively. The method of claim 1,
The visible light-activated photocatalyst and the activated carbon are particles, and the visible light-activated photocatalyst particles are coated on the surface of the activated carbon particles. The method of claim 1,
A functional sheet comprising 1 to 20 parts by weight of the visible light active catalyst material relative to 100 parts by weight of the activated carbon. 7. The method of claim 6,
The photocatalyst layer is a functional sheet comprising 50 g/m ² to 500 g/m ² of activated carbon coated with a visible light active photocatalyst. The method of claim 1,
The visible light active photocatalyst material is a functional sheet comprising a porous metal oxide particle carrying a visible light activity imparting metal. 10. The method of claim 9,
The visible light activity imparting metal is a group consisting of tungsten, chromium, vanadium, molybdenum, copper, iron, cobalt, manganese, nickel, platinum, gold, cerium, cadnium, zinc, magnesium, calcium, stronitium, barium and radium. A functional sheet comprising at least one selected from. 10. The method of claim 9,
The porous metal oxide is a functional sheet comprising at least one selected from titanium oxide, tungsten oxide, zinc oxide, niobium oxide, and combinations thereof. 10. The method of claim 9,
A functional sheet comprising 0.001 to 5 parts by weight of the visible light activity imparting metal relative to 100 parts by weight of the porous metal oxide particles. The method of claim 1,
The photocatalyst layer is a functional sheet that is attached through a separate adhesive layer between the lower substrate layer and the upper substrate layer, respectively. The method of claim 1,
The functional sheet has an after-flame time of less than 3 seconds, a residual-dust time of less than 5 seconds, a carbonization area of less than 30 cm ² , and a carbonization length of less than 20 cm according to the 45 degree combustion test method. An interior material comprising the functional sheet according to claim 1 .

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