Wallpaper having formaldehyde adsorption performance and antibacterial performance and method for manufacturing the same

Abstract

The present invention relates to a wallpaper comprising a substrate layer, a PVC foam layer located on top of the substrate layer, a formaldehyde adsorption functional layer located on top of the PVC foam layer, and a buffer layer located on top of the formaldehyde adsorption functional layer.

Description

Technology Field

[0001] The present invention relates to a wallpaper having a formaldehyde adsorption function and an antibacterial function, and in particular, to a wallpaper having the effect of maintaining the formaldehyde adsorption function for a long period of time and a method for manufacturing the same. Background Technology

[0002] Sick building syndrome is a general term for the appearance of unusual physical symptoms that were not present before when moving into a newly built house, referring to reactions caused by chemical substances among the reactions resulting from indoor air pollution.

[0003] Sick building syndrome is caused by volatile chemical substances, the most representative of which is formaldehyde. Formaldehyde is a colorless gas with an irritating odor that is highly soluble in water; it causes problems as it is primarily used as a preservative, a raw material for adhesives (in the construction and furniture industries), and in spray paints for interior decoration.

[0004] Therefore, reducing the generation and residual levels of formaldehyde in indoor living spaces is essential to suppress sick building syndrome.

[0005] Meanwhile, in human living spaces, various activities such as sleeping, leisure, and resting, as well as cooking and eating, are performed; depending on the environment, conditions with excessive moisture, such as moisture accumulating on walls, may also be formed.

[0006] Since the presence of bacteria cannot be completely eliminated except in the case of a completely sterile space, if an environment favorable for bacterial proliferation is formed in the aforementioned environment with excessive moisture, various bacteria such as mold will proliferate.

[0007] Since byproducts produced by bacteria can have adverse effects on the human respiratory system and skin, it is necessary to prevent bacterial proliferation in advance to create a pleasant living environment.

[0008] Therefore, there is an increasing demand for interior finishing materials that possess antibacterial properties and prevent sick building syndrome, in order to maintain a pleasant living environment. The problem to be solved

[0009] The present invention aims to provide wallpaper that makes human living spaces more comfortable by having an adsorption function for formaldehyde, a harmful substance that can cause sick building syndrome, skin diseases, respiratory diseases, etc.

[0010] The present invention also aims to provide wallpaper that maintains formaldehyde adsorption performance for a long period and prevents the adsorbed formaldehyde from being re-released into the air, thereby maintaining a comfortable indoor space for a long period.

[0011] The present invention also aims to provide a wallpaper having the effect of inhibiting the proliferation of bacteria in an environment where bacteria can proliferate due to moisture in the air or moisture induced from a wall surface. means of solving the problem

[0012] A wallpaper according to the present invention for solving the above-mentioned problem comprises a substrate layer, a PVC foam layer located on top of the substrate layer, a formaldehyde adsorption functional layer located on top of the PVC foam layer, and a buffer layer located on top of the formaldehyde adsorption functional layer.

[0013] In the present invention, the formaldehyde adsorption functional layer may include adipic dihydrazide (ADH).

[0014] In the present invention, the buffer layer may comprise zinc pyrithione and / or zinc oxide (ZnO).

[0015] In the present invention, the thickness of the formaldehyde adsorption functional layer may be 1 to 50 μm (micrometers).

[0016] In the present invention, the thickness of the buffer layer may be 0.1 to 5 μm (micrometers).

[0017] In the present invention, the buffer layer may be formed by gravure printing a composition containing an acrylic resin.

[0018] In the present invention, the wallpaper may have a formaldehyde adsorption rate of 65% or more and an accumulated adsorption amount of 6500 g / m² or more.

[0019] In the present invention, the wallpaper may have antibacterial (antifungal) functionality against Escherichia coli, Staphylococcus aureus, Aspergillus, and blue mold.

[0020] In the present invention, the wallpaper may have a glossiness of 3.0 to 6.0. Effects of the invention

[0021] The wallpaper according to the present invention has formaldehyde adsorption performance and antibacterial performance in the air.

[0022] The wallpaper according to the present invention has the effect of maintaining formaldehyde adsorption performance in the air for a long period of time.

[0023] The present invention also has the effect of inhibiting bacterial growth or mold growth caused by inhalation or bacteria on the wall surface to which the wallpaper is attached. Brief explanation of the drawing

[0024] FIG. 1 is a vertical cross-sectional view of a wallpaper according to one embodiment of the present invention. Specific details for implementing the invention

[0025] Hereinafter, each component of the present invention is described in more detail so that a person skilled in the art to which the present invention pertains can easily implement it; however, this is merely an example, and the scope of the rights of the present invention is not limited by the following.

[0026] Sick building syndrome is a general term for the appearance of unusual physical symptoms that were not present before when moving into a newly built house, referring to reactions caused by chemical substances among the reactions resulting from indoor air pollution.

[0027] Sick building syndrome is caused by volatile chemical substances, the most representative of which is formaldehyde. Formaldehyde is a colorless gas with an irritating odor that is highly soluble in water; it causes problems as it is primarily used as a preservative, a raw material for adhesives (in the construction and furniture industries), and in spray paints for interior decoration.

[0028] The present invention relates to wallpaper capable of creating a pleasant and safe indoor space by having the function of adsorbing and decomposing formaldehyde, which is a cause of sick building syndrome.

[0029] In addition, the present invention is a wallpaper capable of preventing the proliferation and growth of bacteria and preventing the occurrence of mold in environments where bacteria can breed in indoor spaces or under conditions where bacteria can breed due to moisture originating from a wall surface to which the wallpaper is attached.

[0030] Accordingly, the wallpaper according to the present invention, having formaldehyde adsorption and decomposition functions and antibacterial functions, comprises a substrate layer, a PVC foam layer located on top of the substrate layer, a formaldehyde adsorption functional layer located on top of the PVC foam layer, and a buffer layer located on top of the formaldehyde adsorption functional layer.

[0031] The buffer layer located at the uppermost part of the wallpaper provides an antibacterial function on the surface of the wallpaper, while having micropores formed therein, allowing the formaldehyde adsorption functional layer to adsorb formaldehyde from the indoor air through the micropores.

[0032] In addition, as a functional layer for adsorbing formaldehyde is located below the buffer layer, the formaldehyde adsorption function is maintained for a long period, while the adsorbed formaldehyde is decomposed and released into the air.

[0033] The configuration of the present invention will be described in more detail below.

[0034] material layer

[0035] The substrate layer may use general substrate layers used in the wallpaper field without restriction, such as paper or nonwoven fabric (polyester / pulp composite nonwoven fabric), but is not limited thereto.

[0036] The above-mentioned substrate layer may have a basis weight of 80-200 g / ㎡. If the basis weight of the above-mentioned substrate layer is less than the above range, there is a risk of damage such as tearing of the wallpaper during construction or use, and if it exceeds the above range, the wallpaper weight is too heavy, which may cause workability problems such as gaps and curling.

[0037] The thickness of the above substrate layer may be 0.1-0.3 mm, but is not necessarily limited to this.

[0038] PVC foam layer

[0039] A PVC foam layer is located on top of the above substrate layer. The above PVC foam layer is a foam layer containing PVC (Polyvinyl chloride) resin.

[0040] The PVC foam layer forms a soft and cushiony texture on the wallpaper, providing flexible properties to prevent damage to the wallpaper when it is rolled up and stored, and also prevents damage to the wallpaper, such as tearing or wrinkling, during installation.

[0041] In addition, it maintains a soft texture and tough characteristics even after application, so that it does not get easily damaged even when contacted by sharp objects.

[0042] In the present invention, the PVC foam layer may further include an antibacterial agent to form a PVC foam layer having an antibacterial function.

[0043] The antimicrobial agent included in the above PVC foam layer may be used without particular limitation as long as it has an antimicrobial function, but preferably, it may include zinc pyrithione (ZnPT).

[0044] When the PVC foam layer of the wallpaper according to the present invention includes an antibacterial agent, it may be added in an amount of 0.1 to 1.0 parts by weight based on 100 parts by weight of the PVC resin of the PVC foam layer. More preferably, it may be added in an amount of 0.2 to 0.6 parts by weight, and most preferably, in an amount of 0.2 to 0.4 parts by weight.

[0045] If added in a small amount less than the above content, there is a problem that it does not perform antibacterial function even if conditions for bacterial growth are formed on the wall surface where the wallpaper is installed, and if added in an excessive amount more than the above content, discoloration of the wallpaper may occur and weather resistance may be reduced.

[0046] Meanwhile, the above-mentioned PVC foam layer is formed by applying a composition containing PVC resin, a foaming agent, an antibacterial agent, a plasticizer, a filler, or a pigment onto the upper surface of a base layer and then foaming it.

[0047] The above foaming agents, plasticizers, pigments, etc., may be used without special restrictions as long as they are commonly used in the wallpaper industry.

[0048] For example, the blowing agent may be a chemical blowing agent such as azodicarbonamide, azobisporamide, or azobisisobutyronitrile, and the plasticizer may further include dioctyl terephthalate, dioctyl phthalate, calcium carbonate as the filler, or titanium dioxide as the pigment.

[0049] However, this is merely an exemplary description, and various modifications are possible within the scope that does not impede the purpose of the present invention.

[0050] The above PVC foam layer is not particularly limited as long as it consists of a foamed layer, but it may be foamed with a foaming ratio of at least 200%, and preferably, the foaming ratio may be 200 to 300%.

[0051] If the foaming ratio is lower than the above, there is a problem that the wallpaper may curl, and if the foaming ratio is higher than the above, the surface of the foam layer becomes rough, and if a printing layer is formed on top of the PVC foam layer, there may be a problem with reduced printability.

[0052] The above PVC foam layer may have a thickness of 0.1 to 1.0 mm, more preferably 0.2 to 0.5 mm, and most preferably 0.25 to 0.4 mm.

[0053] If the thickness is greater than the above, problems may arise where the seams between the wallpapers separate after installation, and unevenness may occur at the interface between the wallpapers.

[0054] If the thickness is thinner than the above, there is a problem in that it is difficult to form an embossment on the foam layer.

[0055] formaldehyde adsorption functional layer

[0056] The wallpaper according to the present invention includes a formaldehyde adsorption functional layer on top of the PVC foam layer.

[0057] The above-mentioned formaldehyde adsorption functional layer adsorbs formaldehyde in indoor air and then decomposes and releases it, thereby preventing the re-release of formaldehyde into the air and having the function of reducing the formaldehyde content in the air.

[0058] The above-mentioned formaldehyde adsorption functional layer contains adipic dihydrazide (ADH). This component adsorbs formaldehyde and serves to reduce the formaldehyde content and concentration in the air.

[0059] The adipic acid dihydrazide may be included in an amount of 5 to 50 weight% based on the total weight of the formaldehyde adsorption functional layer. Preferably, it may be included in an amount of 10 to 30 weight%.

[0060] When added in a small amount less than the above amount, the formaldehyde adsorption effect is negligible, and there is a problem that the change in the formaldehyde content in the indoor air is negligible, and when added in an excessive amount more than the above amount, the wallpaper has a matte effect, and there is a problem that the aesthetics of the wallpaper after installation are degraded.

[0061] In particular, regarding the potential deterioration of aesthetics after installation when wallpaper has a matte finish, and considering that adhesives such as paste are used to bond wallpaper to walls, and that these adhesives induce gloss when hardened or coated, it is necessary to ensure that the matte effect is absent or maintained at a minimal level, taking into account both workability and aesthetics. This is because the matte finish is diminished when paste accidentally gets on the surface of the wallpaper, at the joints, or during installation, and such paste becomes prominent and messy.

[0062] The above formaldehyde adsorption functional layer may have a thickness of 1 to 50 μm (micrometers). Preferably, it may be 2 to 30 μm (micrometers), and most preferably, it may be 3 to 20 μm (micrometers).

[0063] If the thickness is thinner than the above, the content of adipic acid dihydrazide, which has a formaldehyde adsorption function, decreases, and there is a problem that the amount of formaldehyde adsorbed decreases.

[0064] If the thickness is greater than the above, it reduces the flexibility of the wallpaper, and there are problems with the wallpaper being damaged when it is bent or warped, making installation difficult.

[0065] buffer layer

[0066] The wallpaper according to the present invention further includes a buffer layer on top of the formaldehyde adsorption functional layer.

[0067] Specifically, the buffer layer is positioned above the formaldehyde adsorption functional layer and acts as the surface in contact with indoor air. It is configured to include micropores within the layer so that the lower formaldehyde adsorption functional layer can come into contact with and adsorb formaldehyde in the air.

[0068] The above buffer layer is formed with a thin thickness by gravure printing a composition containing an acrylic resin onto the upper surface of the formaldehyde adsorption functional layer, and together with this, small micropores are formed on the surface.

[0069] The above acrylic resin can be used without particular limitation as long as it is used to form a coating layer or a surface treatment layer in the wallpaper field. For example, it can be selected and mixed from methyl methacrylate (MMA), polymethylmethacrylate (PMMA), methacrylate, and butyl acrylate (BA), and in the present invention, a mixture of methyl methacrylate (MMA) and butyl acrylate (BA) may also be used.

[0070] Meanwhile, the above buffer layer may further include an antimicrobial agent. The antimicrobial agent may be used without particular limitation as long as it has an antimicrobial function, but preferably, it may include zinc pyrithione (ZnPT) or zinc oxide (ZnO).

[0071] When the wallpaper according to the present invention includes an antibacterial agent, it may be added in an amount of 1 to 30 parts by weight based on 100 parts by weight of the acrylic resin of the buffer layer. More preferably, it may be added in an amount of 2 to 10 parts by weight, and if it is added in an excess amount compared to the above content, there is a problem that the buffer layer becomes opaque and weather resistance is reduced.

[0072] In particular, since the buffer layer constitutes the outermost surface layer of the wallpaper located above the printed layer, it must fundamentally satisfy transparency; therefore, even if the antibacterial agent is added, it is necessary to add it at a level below the maximum content so that transparency can be maintained.

[0073] In particular, the present invention is configured such that the buffer layer is positioned above the formaldehyde adsorption functional layer. Since the buffer layer having micropores is positioned above the formaldehyde adsorption functional layer, the formaldehyde adsorption and decomposition functions are maintained for a long period of time, which is an advantage.

[0074] Specifically, if the above buffer layer is not included or is included at the bottom of the formaldehyde adsorption functional layer, the formaldehyde adsorption and decomposition performance of the wallpaper is less than 60% when measuring the adsorption rate (decomposition rate) over 7 days; however, in the case of the wallpaper according to the present invention, it has a higher adsorption rate of 65 to 90% when measuring the adsorption rate (decomposition rate) over 7 days. Ultimately, the wallpaper according to the present invention has the advantage of having significantly superior formaldehyde adsorption and decomposition performance.

[0075] The above buffer layer can be formed by printing a composition containing an acrylic resin. The method of forming the layer can be carried out in various ways, such as spraying the composition, applying a sufficient amount of the composition and then drying it, applying it with a knife, or applying it with a roller. In the case of the present invention, the buffer layer is formed by a printing method to form a thin thickness.

[0076] Specifically, the composition containing the acrylic resin and the antibacterial agent is manufactured by printing it onto the surface of the formaldehyde adsorption functional layer and then drying it.

[0077] More preferably, through a gravure printing method, a buffer layer having a thinner thickness can be formed, while micropores can be formed on the surface.

[0078] In a gravure printing method, ink is applied to a gravure printing plate with an intaglio formed thereon, and after processing so that the ink remains only in the intaglio portion, the workpiece is placed between the gravure printing plate and the impression roller and printed by pressing and rolling.

[0079] The buffer layer of the wallpaper according to the present invention is formed as a layer with micropores by manufacturing using a gravure printing plate formed so that micropores can be formed.

[0080] More specifically, the buffer layer may be manufactured using a gravure printing roller having a polygonal intaglio formed with a diameter of 300 μm (micrometer) or less. More preferably, a polygonal intaglio formed with a diameter of 200 μm (micrometer) may be formed, and most preferably, a polygonal intaglio formed with a diameter of 160 μm (micrometer) or less may be formed.

[0081] If the value is smaller than the above diameter range, there may be a problem in that micropores are not formed due to the phenomenon of the printed composition spreading during the drying process of the layer after gravure printing, and if the value is larger than the above diameter range, the size of the micropores in the buffer layer becomes too large, so there may be a problem in that the formaldehyde adsorption and decomposition effect in the lower layer cannot be maintained for a long period of time.

[0082] The diameter of the micropores of the buffer layer formed by the above method may be 1 to 70 μm (micrometers). Although it may vary depending on the viscosity and thickness of the composition forming the buffer layer, if a gravure printing roller satisfying the above conditions is used, the diameter of the micropores may be formed to have the above range.

[0083] However, although the present invention proposes a gravure printing method as a preferred printing method, if a buffer layer containing micropores can be formed in the same way as the present invention using digital printing, screen printing, etc., the same effect as the present invention can be obtained as long as the diameter range of the micropores is satisfied.

[0084] At this time, the above intaglio is composed of two or more multiple intaglios, and the distance between the multiple intaglios may be 100 μm (micrometer) or less, preferably 80 μm (micrometer) or less, most preferably 60 μm (micrometer) or less.

[0085] The above polygon refers to a figure having n vertices (n is a natural number greater than or equal to 3), such as a triangle, a square, or a pentagon. As n becomes infinitely large, it becomes similar to a circle, so a circle is also considered to be included in the above polygon.

[0086] If the diameter is larger than the above, the micropores are formed too large, which causes a problem in that the duration of the formaldehyde adsorption effect is not significantly different from the existing one, and if the diameter is smaller than the above, the surface area of ​​the formaldehyde adsorption functional layer in contact with formaldehyde in the air is narrowed, and as the surface area where adsorption and decomposition reactions occur decreases, there may be a problem in that the adsorption and decomposition functions cannot be exerted.

[0087] The above buffer layer may have a thickness of 0.1 to 5 μm (micrometers), preferably 0.1 to 3 μm (micrometers), and most preferably 0.3 to 2.5 μm (micrometers).

[0088] If the thickness is thinner than the above, there may be a problem in that the effect of improving the adsorption and decomposition functions of the formaldehyde adsorption functional layer is negligible, and if the thickness is thicker than the above, the coating liquid may spread sideways and fill the pores, which may result in a problem in that micropores are not formed in the buffer layer.

[0089] wallpaper

[0090] The wallpaper according to the present invention, satisfying the above-described composition and combination relationship, has antibacterial functionality and formaldehyde adsorption functionality. In particular, compared to the case where the formaldehyde adsorption functional layer is located on the outermost surface of the wallpaper, the wallpaper provides excellent formaldehyde adsorption functionality and maintains the effect for a long period of time.

[0091] The wallpaper according to the present invention may have an adsorption rate (decomposition rate) of formaldehyde over 7 days of 65% or more, preferably 70% or more, and most preferably 75 to 90%.

[0092] If the value is lower than the above figure, there is a problem in that the difference in effect is negligible compared to the case where the formaldehyde adsorption functional layer is located on the outermost surface of the wallpaper, and if the value is higher than the above figure, there may be a problem in that manufacturing costs increase excessively.

[0093] E. coli ( Escherichia coli ATCC 8739) and Staphylococcus aureus ( Staphylococcus aureus It has antibacterial functionality against bacteria such as ATCC 6538P) and Aspergillus niger ( Aspergillus brasiliensis(niger) ATCC 9642) and blue mold ( PenicilliumIt is characterized by having antifungal performance against molds such as ATCC 11797.

[0094] Meanwhile, as described above, the wallpaper according to the present invention is configured so as not to have a matte effect, so the gloss may be 3.0 to 6.0, and preferably 3.5 to 5.5. This is to prevent problems such as reduced workability and aesthetic appeal after wallpaper installation, as described above.

[0095] The present invention will be described in more detail below with reference to the drawings.

[0096] FIG. 1 is a vertical cross-sectional view of a wallpaper according to one embodiment of the present invention.

[0097] Referring to FIG. 1, the wallpaper according to the present invention has a structure in which a base layer (10), a PVC foam layer (20), a formaldehyde adsorption functional layer (30), and a buffer layer (40) are sequentially laminated from the bottom surface.

[0098] If necessary, a printed layer or a three-dimensional effect layer may be additionally included on the upper part of the PVC foam layer (20) to provide an appearance effect such as a design.

[0099] In particular, the buffer layer (40) is located on top of the formaldehyde adsorption functional layer (30) and includes micropores that are breathable so that indoor air can come into contact with the formaldehyde adsorption functional layer (30). Formaldehyde introduced through the micropores reacts with the adipic acid dihydrazide of the formaldehyde adsorption functional layer (30) and is fixed to the layer. The fixed formaldehyde is not easily released back into the air because contact with indoor air is restricted by the buffer layer (40) on the surface.

[0100] Ultimately, through this process, formaldehyde gradually accumulates on the formaldehyde adsorption functional layer (30), and the formaldehyde content in the indoor air is reduced.

[0101] Meanwhile, the above buffer layer (40) is composed of the outermost surface of the wallpaper so as to prevent bacteria in the indoor air from multiplying.

[0102] The present invention will be described in more detail below according to embodiments.

[0103] [Preparation Example]

[0104] Paper substrate (basis weight 100g / m²) 2 A PVC sol containing PVC resin, zinc pyrithione, and a foaming agent was applied to a thickness of 0.2 mm on the surface, and then foamed in a 200°C oven to form a PVC foam layer with a thickness of 0.5 mm. A composition containing water, acrylic resin (binder), a dispersant, an additive, dihydrazide adipic acid, and other adsorbents was applied onto the PVC foam layer and then dried. A buffer layer was formed on the surface by gravure printing a composition containing acrylate and zinc pyrithione.

[0105] During the above gravure printing, it was manufactured using a gravure printing roller in which intaglio with a diameter of 160 μm (micrometer) is formed at intervals of 60 μm (micrometer).

[0106] Wallpaper was manufactured by referring to the above manufacturing example and Table 1 below.

[0107] PVC foam layer formaldehyde adsorption functional layer Buffer layer thickness (㎛) Zinc pyrithione (based on 100 parts by weight of PVC, parts by weight) Thickness (㎛) Contains zinc pyrithione ZnO included Antibacterial agent X Example 1 0.4 9 1.5 - - Example 2 0.4 15 - 1.5 - Example 3 0.4 9 - - 1.5 Comparative Example 1 0.4 9 - - - Comparative Example 2 0 9 - 1.5 - Comparative Example 3 0.4 1 - 1.5 - Comparative Example 4 0.4 30 - 1.5 - Comparative Example 5 0.4 9 5 - - Comparative Example 6 0.4 9 - 10 -

[0108] [Experimental Method]

[0109] 1. Evaluation of antibacterial (antifungal) functionality

[0110] Prepare a mixed spore suspension. Immerse the sample in the cultured suspension and culture for 4 weeks. Measure the area of ​​the cultured strain on the sample to determine the grade.

[0111] The above grades indicate that the lower the number, the better the antibacterial (antifungal) function.

[0112] 2. Evaluation of Formaldehyde Adsorption Functionality

[0113] It is evaluated using the KS I 3546 method. Standard gas is supplied to the adsorption test chamber under constant conditions, and the outlet and inlet air of the chamber are collected after 7 days to evaluate the adsorption rate and the total adsorption amount.

[0114] 3. Glossiness measurement

[0115] Gloss is measured using a gloss meter based on the KS M ISO 2813 standard and expressed quantitatively. The gloss was measured at a measurement angle of 60°.

[0116] 4. Weathering resistance measurement

[0117] Weather resistance is evaluated by irradiating the specimen with Q-UV for 24 hours and measuring the difference from the initial color.

[0118] The experimental results for the manufactured wallpaper are shown in Table 2.

[0119] Formaldehyde adsorption performance Antimicrobial properties (ASTM G21) (Grade) Gloss (GU) Weather resistance (△E) Adsorption rate (%) Total adsorption amount (µg / m²) Example 1 72 6679 0 4.3 1.5 Example 2 83 7464 0 3.8 1.0 Example 3 72 6679 0 4.6 0.8 Comparative Example 1 64 6387 0 2.8 0.8 Comparative Example 2 72 6679 4 4.5 0.6 Comparative Example 3 35 3800 0 4.6 1.1 Comparative Example 4 92 8900 1 3.7 2.0 Comparative Example 5 72 6679 0 4.5 9.1 Comparative Example 6 72 6679 0 3.9 1.4

[0120] Referring to Tables 1 and 2 above, it can be confirmed that the wallpaper of the example has excellent formaldehyde adsorption performance and excellent antibacterial properties.

[0121] In contrast, in the case of Comparative Example 1, only a formaldehyde adsorption functional layer is included without a buffer layer, and since the layer is located on the outermost surface of the wallpaper, it can be confirmed that the formaldehyde absorption rate is significantly lower than that of the wallpapers of the examples.

[0122] In addition, as in Comparative Example 3, when the thickness of the formaldehyde adsorption functional layer is reduced, it can be confirmed that the formaldehyde adsorption performance itself is absolutely degraded as the formaldehyde adsorption component itself is included in a significantly lower amount.

[0123] Compared to Comparative Example 3, when the thickness of the formaldehyde adsorption functional layer is increased, the formaldehyde adsorption performance becomes excellent, but the wallpaper bends easily, so there was a problem that it could not be used as wallpaper.

[0124] On the other hand, it can be confirmed that when the PVC foam layer does not contain zinc pyrithione, the antibacterial properties of the wallpaper are significantly reduced. It can be seen that the antibacterial properties of the wallpaper are greatly influenced by the zinc pyrithione contained in the PVC foam layer.

[0125] In addition, the zinc pyrithione can also be added to the buffer layer to provide antibacterial properties, but if the zinc pyrithione content is excessively added to the buffer layer, it can be confirmed that there is a problem with reduced weather resistance of the wallpaper, as shown in Comparative Example 3.

[0126] In the case of Comparative Example 4, as the thickness of the formaldehyde adsorption functional layer was formed thickly, the absolute amount of formaldehyde adsorbed increased significantly, but there were problems such as increased matte effect and reduced weather resistance, so it can be confirmed that it has characteristics unsuitable for use in wallpaper.

[0127] Comparative Example 5 can be seen to have significantly reduced weather resistance as the thickness of the buffer layer containing zinc pyrithione is formed thickly, and thus it is found to have characteristics unsuitable for use as wallpaper that remains installed on a wall for a long period of time.

[0128] Likewise, in the case of Comparative Example 6, in which the thickness of the buffer layer containing zinc oxide was formed thickly, as the viscosity of the composition for forming the buffer layer increased, there was a problem in that it was difficult to form the buffer layer by printing method, and it was difficult to form micropores in the buffer layer, and it was confirmed that the antibacterial properties were actually reduced. Explanation of the symbols

[0129] 10: Base layer 20: PVC foam layer 30: Formaldehyde adsorption functional layer 40: Buffer layer

Claims

Claim 1 A wallpaper comprising: a substrate layer; a PVC foam layer located on top of the substrate layer; a formaldehyde adsorption functional layer located on top of the PVC foam layer; and a buffer layer located on top of the formaldehyde adsorption functional layer; wherein the thickness of the formaldehyde adsorption functional layer is 15 to 20 μm and the thickness of the buffer layer is 0.1 to 3 μm, the PVC foam layer comprises zinc pyrithione, and the zinc pyrithione is added in an amount of 0.2 to 0.4 parts by weight based on 100 parts by weight of the PVC resin of the PVC foam layer, the buffer layer comprises micropores, and the buffer layer is manufactured using a gravure printing roller having a plurality of polygonal indentations formed thereon, wherein the diameter of the plurality of indentations is 160 μm or more and 300 μm or less, and the distance between the plurality of indentations is 60 μm or more and 100 μm or less. Claim 2 In claim 1, the formaldehyde adsorption functional layer is a wallpaper comprising adipic dihydrazide (ADH). Claim 3 In claim 1, the buffer layer is a wallpaper comprising zinc pyrithione and / or zinc oxide (ZnO). Claim 4 delete Claim 5 delete Claim 6 In claim 1, the buffer layer is a wallpaper formed by gravure printing a composition containing an acrylic resin. Claim 7 In claim 1, the buffer layer is a wallpaper comprising micropores with a diameter of 1 to 70 μm (micrometers). Claim 8 In claim 1, the wallpaper has a formaldehyde adsorption rate of 65% or more and an accumulated adsorption amount of 6500 g / ㎡ or more. Claim 9 In claim 1, the wallpaper has antibacterial (antifungal) functionality against one or more selected from the group consisting of Escherichia coli, Staphylococcus aureus, Aspergillus, and blue mold. Claim 10 In claim 1, the wallpaper is a wallpaper having a glossiness of 3.0 to 6.0.

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