Moisture-proof foam wallpaper

Abstract

To provide moisture-proof foamed wallpaper which has strong moisture-proofness and can withstand storage for a long period of time after coating of a construction paste.SOLUTION: Moisture-proof foamed wallpaper 10 includes a base material 20, a foamed resin layer 30 laminated on the base material 20, a pattern printing layer 40 laminated on the foamed resin layer 30, and a surface protective layer 50 laminated on the pattern printing layer 40, wherein the foamed resin layer 30 is formed so as to contain an aqueous emulsion resin as a main component, the base material 20 has a paper layer 70 and a moisture-proof layer 60 laminated on one surface on the side of the foamed resin layer 30 of the paper layer 70, in the moisture-proof layer 60, a resin layer 61, a vapor-deposited layer 62 and an overcoat layer 63 are laminated in this order from the side of the paper layer 70, the resin layer 61 contains a polyvinyl alcohol-based resin, and the overcoat layer 63 contains polyolefin having at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic acid anhydride group and carboxylate.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a moisture-proof intumescent wallpaper for use in the wall decoration of buildings and the like. [Background technology]

[0002] Current emulsion-type non-PVC wallpapers are characterized by the fact that they do not have the problems of residual solvent components and the addition of large amounts of plasticizers that are common in PVC wallpapers on the market. However, current wallpapers have high moisture permeability, so they have the property of quickly releasing moisture from the application glue applied to the back to the surface via the backing paper. This property causes the glue on the back to dry out in a short time after application, which can lead to a phenomenon in which the glue loses its adhesiveness when applied after long storage, or a problem called "peeling," in which the glued surfaces of the backs of the wallpapers stick together and peel off when they are stacked together.

[0003] Since adhesion to starch-based application glue is important for wallpaper application, substrates with no adhesion such as aluminum foil cannot be used, and peeling work is required during renovation or demolition. For this reason, there is a demand for pulp-based paper with high peelability. However, ordinary paper has high moisture permeability and water absorption, and easily releases moisture.

[0004] 2. Description of the Related Art Conventionally, wallpaper that has moisture-proof properties and can be installed without problems has been known in which a layer of moisture-proof nonwoven fabric or the like is formed between a backing paper and a resin layer (see Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2001-123398 Summary of the Invention [Problem to be solved by the invention]

[0006] Until now, wallpaper-related technologies have focused on giving wallpaper high moisture permeability in order to improve living environments, and no technology has been developed that deliberately reduces moisture permeability. However, due to the continuing decline in the number of construction workers in recent years, most workers are unable to devote time to on-site rapid response work such as applying glue and hanging the wallpaper immediately, so they often apply glue to most of the wallpaper at once before arriving at the site and then bring it in, or carry over any unused wallpaper and use it the next day. This has made the storage stability of highly moisture-permeable wallpaper a major issue.

[0007] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a moisture-proof foamed wallpaper which has strong moisture-proof properties and can withstand long-term storage even after application of application paste.

[0008] In order to solve the above problems, one aspect of the present invention provides a moisture-proof foamed wallpaper comprising a substrate, a foamed resin layer laminated on the substrate, a picture-printed layer laminated on the foamed resin layer, and a surface protective layer laminated on the picture-printed layer, the foamed resin layer being formed mainly from an aqueous emulsion resin, the substrate having a paper layer and a moisture-proof layer laminated on one surface of the paper layer facing the foamed resin layer, the moisture-proof layer being formed by laminating a resin layer, a vapor deposition layer, and an overcoat layer in this order from the paper layer side, the resin layer containing a polyvinyl alcohol-based resin, and the overcoat layer containing a polyolefin having at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride group, and a carboxylic acid ester. Effect of the Invention

[0009] According to one aspect of the present invention, it is possible to provide a moisture-proof foamed wallpaper which has strong moisture-proof properties and can withstand long-term storage even after application of application paste. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view showing a configuration of a foam wallpaper according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] An embodiment of the present invention (hereinafter, referred to as "the present embodiment") will be described below with reference to the drawings. In the description of the drawings referred to in the following description, the same or similar parts are given the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between thickness and planar dimensions, the thickness ratio of each layer, etc., differ from the actual ones. Therefore, the specific thickness and dimensions should be determined with reference to the following description. In addition, it goes without saying that the drawings also include parts with different dimensional relationships and ratios.

[0012] Furthermore, the present embodiment shown below is an example of a configuration for embodying the technical idea of ​​the present invention, and the technical idea of ​​the present invention does not specify the materials of the components, their shapes, structures, arrangements, etc., as described below. The technical idea of ​​the present invention can be modified in various ways within the technical scope defined by the claims. In addition, the directions of "left and right" and "up and down" in the following explanation are merely defined for the convenience of explanation and do not limit the technical idea of ​​the present invention. Therefore, for example, if the paper is rotated 90 degrees, "left and right" and "up and down" are read interchangeably, and of course, if the paper is rotated 180 degrees, "left" becomes "right" and "right" becomes "left".

[0013] <Moisture-proof foam wallpaper> The configuration of the moisture-proof foaming wallpaper according to this embodiment will be described below with reference to Fig. 1. Fig. 1 is a cross-sectional view that shows a schematic example of the configuration of the moisture-proof foaming wallpaper according to this embodiment. 1, the moisture-proof foam wallpaper 10 according to this embodiment comprises, in this order, a base material 20, a foamed resin layer 30, a picture-printed layer 40, and a surface protective layer 50. More specifically, the moisture-proof foam wallpaper 10 comprises the base material 20, the foamed resin layer 30 laminated on the base material 20, the picture-printed layer 40 laminated on the foamed resin layer 30, and the surface protective layer 50 laminated on the picture-printed layer 40.

[0014] (base material) The substrate 20 is a sheet-like layer formed to support the foamed resin layer 30 . As shown in FIG. 1, the substrate 20 has a paper layer 70 and a moisture-proof layer 60 laminated on one surface of the paper layer 70 on the foamed resin layer 30 side. In this example, the substrate 20 is formed by laminating, in this order, a paper layer 70, a resin layer 61 containing a polyvinyl alcohol-based resin, a vapor deposition layer 62, and an overcoat layer 63. The moisture-proof layer 60 is formed by a laminate in which the resin layer 61 containing a polyvinyl alcohol-based resin, the vapor deposition layer 62, and the overcoat layer 63 are laminated in this order from the paper layer 70 side. Although described in detail below, the overcoat layer 63 is a layer containing a polyolefin having at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride group, and a carboxylate.

[0015] [Paper layer] The material of the paper layer 70 is not particularly limited and may be appropriately selected depending on the application of the wallpaper to be applied. Specific examples of the paper layer 70 include tissue paper, fine paper, art paper, cast coated paper, craft paper, titanium paper, linter paper, paperboard, gypsum board paper, fine paper, coated paper, sulfuric acid paper, glassine paper, parchment paper, paraffin paper, and Japanese paper. The basis weight of the paper layer 70 is not particularly limited, but is preferably 20 g / m 2 If it is less than 200g / m 2 If it exceeds 20g / m, the stiffness will be too strong and may cause problems with winding and installation. 2 More than 200g / m 2 The following range is preferable: 40 g / m 2 More than 100g / m 2 It is more preferable that the range is within the range.

[0016] Furthermore, the paper layer 70 may be subjected to surface treatment such as corona treatment, plasma treatment, or flame treatment, if necessary.

[0017] The paper layer 70 may be provided with a coating layer (not shown) on the side in contact with at least the resin layer 61 containing a polyvinyl alcohol resin described below. The coating layer can prevent the resin layer 61 from seeping into the paper layer 70, and can also act as a sealer to fill in unevenness in the paper, allowing the resin layer 61 to be formed uniformly without defects. The coating layer may contain, for example, various copolymers such as styrene-butadiene, styrene-acrylic, and ethylene-vinyl acetate copolymers, polyvinyl alcohol resins, cellulose resins, paraffin (WAX), etc. as binder resins, and may contain clay, kaolin, calcium carbonate, talc, mica, etc. as fillers.

[0018] The thickness of the coating layer is not particularly limited, but is, for example, preferably from 1 μm to 10 μm, and more preferably from 3 μm to 8 μm.

[0019] Furthermore, the weight of the paper layer 70 is preferably 50% by mass or more, more preferably 70% by mass or more, and even more preferably 80% by mass or more, based on the weight of the entire moisture proof layer 60. If the weight of the paper layer 70 is 50% by mass or more based on the weight of the entire moisture proof layer 60, the amount of plastic material used can be sufficiently reduced compared to conventional moisture proof sheets (for example, moisture proof sheets made of synthetic resins such as polyvinyl chloride, polyethylene, polypropylene, etc., or made of paper / polyethylene / paper), and it can be said that the substrate 20 in the moisture proof foam wallpaper 0 is a paper substrate.

[0020] [Resin layer containing polyvinyl alcohol-based resin] The resin layer 61 containing a polyvinyl alcohol-based resin is provided on the surface of the paper layer 70 (the surface on the foamed resin layer 30 side) in order to improve adhesion between the paper layer 70 and the vapor deposition layer 62. Examples of the polyvinyl alcohol-based resin include fully saponified polyvinyl alcohol resin, partially saponified polyvinyl alcohol resin, modified polyvinyl alcohol resin, and ethylene-vinyl alcohol copolymer resin. The degree of polymerization of the polyvinyl alcohol-based resin is preferably 300 or more and 1500 or less. If the degree of polymerization is 300 or more, the barrier properties and flex resistance of the moisture-proof layer become good, and if the degree of polymerization is 1500 or less, the viscosity of the coating liquid of the polyvinyl alcohol-based resin described below becomes low, resulting in good coatability.

[0021] The resin layer 61 can be provided by applying a coating liquid containing the above-mentioned polyvinyl alcohol resin and a solvent onto the paper layer 70 and drying it. Examples of the solvent contained in the coating liquid include water, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, n-pentyl alcohol, dimethyl sulfoxide, dimethylformamide, and dimethylacetamide, and in particular, a mixed solvent of water and an alcohol such as methyl alcohol, ethyl alcohol, or isopropyl alcohol is preferred. The coating liquid may also contain additives such as surfactants, preservatives, storage stabilizers, silane coupling agents, and organic titanates.

[0022] Such a resin layer 61 has excellent flexibility, and can suppress cracking of the vapor-deposited layer 62 and can improve the adhesion between the paper layer 70 and the vapor-deposited layer 62 .

[0023] The thickness of the resin layer 61 may be, for example, 1 μm or more, preferably 2 μm or more, and preferably 5 μm or less. If the thickness of the resin layer 61 is 1 μm or more, the unevenness of the paper layer 70, which is the above-mentioned paper base material, can be efficiently filled, and the deposition layer 62 can be laminated uniformly. Furthermore, even if the thickness of the resin layer 61 is greater than 5 μm, there is no problem in terms of moisture resistance, but if the thickness of the resin layer 61 is 5 μm or less, the deposition layer 62 can be laminated uniformly while suppressing costs.

[0024] [Vapour-deposited layer] The deposition layer 62 is a layer formed by depositing a metal or an inorganic compound. The deposition layer 62 may be obtained by depositing aluminum, or may contain aluminum oxide (AlOx), silicon oxide (SiOx), or the like.

[0025] The thickness of the deposition layer 62 may be appropriately set depending on the application, but is preferably in the range of 10 nm to 300 nm, more preferably in the range of 30 nm to 100 nm. By setting the thickness of the deposition layer 62 to 10 nm or more, the continuity of the deposition layer 5 can be easily ensured, and by setting the thickness to 300 nm or less, the occurrence of curling or cracking can be sufficiently suppressed, and sufficient moisture resistance, gas barrier performance, and flexibility can be easily achieved.

[0026] From the viewpoint of oxygen gas barrier performance and film uniformity, it is preferable to form the deposition layer 62 by a vacuum deposition method. There are known deposition methods such as vacuum deposition, sputtering, and chemical vapor deposition (CVD), but vacuum deposition is preferred because of its fast deposition rate and high productivity. Among the vacuum deposition methods, deposition by electron beam heating is particularly effective because the deposition rate can be easily controlled by the irradiation area and electron beam current, and the temperature of the deposition material can be raised and lowered in a short time.

[0027] [Overcoat layer] The overcoat layer 63 is provided on the surface of the vapor-deposited layer 62 so as to be in contact with the vapor-deposited layer 62, and contains a polyolefin having at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride group, and a carboxylate ester.

[0028] Such an overcoat layer 63 has excellent flexibility, can suppress cracking of the vapor deposition layer 62, and has excellent adhesion to the vapor deposition layer 62. Furthermore, by including the above-mentioned polyolefin, it is possible to obtain a moisture proof layer 60 having excellent water vapor barrier properties.

[0029] The overcoat layer 63 may contain other components in addition to the above-mentioned polyolefin, such as a silane coupling agent, an organic titanate, polyacrylic, polyester, polyurethane, polycarbonate, polyurea, polyamide, a polyolefin emulsion, polyimide, melamine, and phenol.

[0030] The content of the second polyolefin in the overcoat layer 63 may be, for example, 50% by mass or more, preferably 70% by mass or more, more preferably 90% by mass or more, and even more preferably 100% by mass.

[0031] The thickness of the overcoat layer 63 containing polyolefin may be, for example, 2 μm or more, and preferably 3 μm or more. The thickness of the overcoat layer 63 may be 10 μm or less, and is preferably 8 μm or less, and more preferably 5 μm or less. Even if the thickness of the overcoat layer 63 is greater than 10 μm, there is no problem with moisture resistance, but if the thickness of the overcoat layer 64 is 10 μm or less, it is possible to sufficiently exhibit adhesion to the deposition layer 62 and barrier properties while suppressing costs.

[0032] The overcoat layer 63 can be provided by applying a coating liquid containing the above-mentioned polyolefin and a solvent to the surface of the deposition layer 62 opposite to the resin layer 61, and drying the coating liquid. Examples of the solvent contained in the coating liquid include water, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, n-pentyl alcohol, dimethyl sulfoxide, dimethylformamide, dimethylacetamide, toluene, hexane, heptane, cyclohexane, acetone, methyl ethyl ketone, diethyl ether, dioxane, tetrahydrofuran, ethyl acetate, and butyl acetate. These solvents may be used alone or in combination of two or more. Among these, from the viewpoint of characteristics, methyl alcohol, ethyl alcohol, isopropyl alcohol, toluene, ethyl acetate, methyl ethyl ketone, and water are preferred. Furthermore, from the viewpoint of the environment, methyl alcohol, ethyl alcohol, isopropyl alcohol, and water are preferred.

[0033] (Foamed resin layer 30) The foamed resin layer 30 is laminated on the substrate 20. Specifically, the foamed resin layer 30 is laminated on the upper surface of the substrate 20 (the surface of the overcoat layer 63 opposite to the deposition layer 62) in FIG. In addition, the foamed resin layer 30 contains a resin component, a filler, a foaming agent, a foaming assistant, a resin portion, an organic antibacterial agent, an additive, and an antibacterial agent, and is formed by foaming the foaming agent.

[0034] The resin component contained in the foamed resin layer 30 contains an aqueous emulsion resin as a main component. That is, the foamed resin layer 8 is formed with the aqueous emulsion resin as a main component. For example, an inorganic filler can be used as the filler contained in the foamed resin layer 8. The inorganic filler can be used alone or in combination of two or more kinds.

[0035] As the inorganic filler, for example, calcium carbonate, titanium dioxide, kaolin, etc. can be used. From the viewpoint of performance (expansion ratio, strength), it is preferable that the foaming agent (volatile expanding agent) contained in the foamed resin layer 30 is added in the form of thermally expandable microcapsules to the resin component contained in the foamed resin layer 30. In addition, the foaming agent contained in the foamed resin layer 8 may be an azo type, a hydrazide type, a nitroso type, or the like.

[0036] Furthermore, the foamed resin layer 30 may be colored by adding a pigment or the like, if necessary. The coloring resulting from the addition of pigments may be transparent, semi-transparent, or opaque.

[0037] As the pigment, for example, iron oxide, carbon black, etc. can be used. The amount of pigment added is preferably within a range of 5% by mass to 50% by mass, and more preferably within a range of 10% by mass to 30% by mass, based on the total amount of the resin layer.

[0038] The antibacterial agent contained in the foamed resin layer 30 must be soluble in water (water-soluble), and therefore, for example, a thiazole-based agent can be used. In addition, the antibacterial agent contained in the foamed resin layer 30 can be a nitrile-based, imidazole-based, alcohol-based, aldehyde-based (carboxylic acid-based, ester-based), disulfide-based, thiocarbamate-based, phenol-based, etc., as long as it is water-soluble.

[0039] Furthermore, the antibacterial agent contained in the foamed resin layer 30 can be, so long as it is water-soluble, a pyridine / quinoline type, a triazine type, an isothiazolone type, an anilide type, a carboxylic acid type, an ether type, a peroxide / epoxy type, a biguanide type, a surfactant type, or the like.

[0040] As the flame retardant, for example, metal oxide flame retardants such as magnesium hydroxide and aluminum hydroxide, phosphorus-based flame retardants such as phosphate esters, bromine-based flame retardants such as tetrabromobisphenol A, and the like can be used.

[0041] (Pattern printing layer 40) The picture-printed layer 40 is laminated on the foamed resin layer 30. Specifically, the picture-printed layer 40 is laminated on the upper surface of the foamed resin layer 30 (the surface of the foamed resin layer 30 opposite the substrate 20) in FIG.

[0042] The pattern printed layer 40 provides the moisture-proof foamed wallpaper 10 with a desired design, and the type of the design is not particularly limited. As for the pattern, it is possible to select a pattern suitable for the area where the moisture-proof foam wallpaper 10 will be used, such as wood grain patterns, stone patterns, sand patterns, tile patterns, brickwork patterns, fabric patterns, leather patterns, geometric shapes, letters, symbols, abstract patterns, etc.

[0043] There are no particular limitations on the printing ink that forms the pattern printing layer 40, so long as it meets the requirements for light resistance, color development, and safety of the ingredients used (such as not containing heavy metals or sulfur compounds as pigments or additives) that are generally required for wallpaper. In this embodiment, as an example, a case will be described in which the printing ink for forming the picture print layer 40 is a water-based ink with an acrylic polymer as the base resin.

[0044] The printing ink that forms the picture-printed layer 40 is composed of the above-mentioned aqueous emulsion, and becomes a coating of the picture-printed layer 40 by drying after printing. The ink also contains known pigments that form the picture pattern.

[0045] In addition, it is possible to enrich the expression of the pattern by combining and blending pigments into the printing ink that forms the pattern-printed layer 40. In addition, it is possible to improve weather resistance by adding an ultraviolet absorbing agent, a light stabilizer, etc. to the printing ink that forms the pattern-printed layer 40. The pattern can be printed by known printing methods such as gravure printing, offset printing, silk screen printing, and inkjet printing.

[0046] In particular, when the entire surface is to be colored uniformly, a coating method and device may be used in addition to the printing method described above.

[0047] (Surface protective layer 50) The surface protective layer 50 is laminated on the pattern-printed layer 40 and is also called a coat layer (coating layer). Specifically, the surface protective layer 50 is laminated on the upper surface of the pattern-printed layer 40 (the surface of the pattern-printed layer 40 opposite the foamed resin layer 30) in FIG.

[0048] The surface protection layer 50 contains acrylic acid (CH 2 =CHCOOH) and methacrylic acid (CH 2 =C(CH 3 )COOH), or esters thereof, or a polymer obtained by copolymerizing a polymer with one or more monomers or block copolymers of styrene, vinyl acetate, ethylene, and an α-olefin.

[0049] The surface protection layer 50 may be configured to contain a resin such as polyvinyl chloride as a resin component other than the silicone resin. The basis weight of the surface protective layer 50 is set to 1.0 g / m from the viewpoint of imparting physical properties such as protection from heat and chlorine, surface strength, and stain resistance. 2 More than 30.0g / m 2 The surface protective layer 50 preferably has a basis weight of 5.0 g / m 2 More than 25.0g / m 2 It is more preferable that the content is within the following range:

[0050] Furthermore, on the surface of the surface protective layer 50 opposite to the surface facing the picture-printed layer 40 (the upper surface of the surface protective layer 50 in FIG. 1), a concave-convex shape 51 is formed by embossing. The uneven shape 51 produced by embossing can be, for example, cloth grain, duct grooves in a wood grain board, unevenness on a stone slab surface, cloth surface texture, matte finish, sand grain, hairline, linear grooves, etc., and can be appropriately selected.

[0051] <Features and Effects of the Embodiments Based on the Present Invention> The features of the embodiment according to the present invention are as follows. (First characteristic point) A first characteristic point is that the moisture-proof foam wallpaper 10 of this embodiment comprises a substrate 20, a foamed resin layer 30 laminated on the substrate 20, a picture-printed layer 40 laminated on the foamed resin layer 30, and a surface protective layer 50 laminated on the picture-printed layer 40, the foamed resin layer 30 being formed primarily from an aqueous emulsion resin, the substrate 20 having a paper layer 70 and a moisture-proof layer 60 laminated on one surface of the paper layer 70 facing the foamed resin layer 30, the moisture-proof layer 60 being composed of a resin layer 61, a vapor deposition layer 62 and an overcoat layer 63 laminated in this order from the paper layer 70 side, the resin layer 61 comprising a polyvinyl alcohol-based resin, and the overcoat layer 63 comprising a polyolefin having at least one type selected from a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride group and a carboxylic acid ester.

[0052] (Effect of the first feature) According to the first characteristic, the substrate 20 having the moisture-proof layer 60 gives the moisture-proof foam wallpaper 10 strong moisture-proof properties, prevents moisture in the application glue on the back surface from coming out to the surface, and enables the wallpaper to withstand long-term storage after gluing (application of application glue). In other words, the moisture-proof foam wallpaper 10 having the first characteristic has a strong moisture-proof layer 60, is a non-PVC wallpaper with an emulsion specification with low moisture permeability that can withstand long-term storage after application of application glue, and is a moisture-proof foam wallpaper with an emulsion specification that has excellent workability and does not cause problems such as rapid drying of the glue or peeling during application.

[0053] (Second characteristic point) The second characteristic point is that the thickness of the resin layer 61 is not less than 1 μm and not more than 5 μm. (Effect of the second feature) According to the second characteristic point, since the thickness of the resin layer 61 is 1 μm or more and 5 μm or less, the unevenness of the paper layer 70 can be efficiently filled, and at least the vapor deposition layer 62 can be laminated uniformly while keeping costs down.

[0054] (Third characteristic point) The third characteristic point is that the thickness of the deposition layer 62 is not less than 30 nm and not more than 100 nm. (Effect of the third feature) According to the third characteristic point, by making the thickness of the vapor deposition layer 62 30 nm or more, it is easy to ensure sufficient continuity of the vapor deposition layer 62, and by making the thickness of the vapor deposition layer 62 100 nm or less, the occurrence of curling and cracking can be sufficiently suppressed, and it is easy to achieve sufficient moisture resistance performance, gas barrier performance, and flexibility.

[0055] (Fourth characteristic point) The fourth characteristic point is that the thickness of the overcoat layer 63 is not less than 2 μm and not more than 10 μm. (Effect of the fourth feature) According to the fourth characteristic, it is possible to sufficiently exhibit adhesion to the deposition layer 62 and barrier properties while keeping costs down.

[0056] (Fifth feature) A fifth characteristic point is that the weight of the paper layer 70 is 50% by mass or more based on the weight of the entire moisture-proof layer 60. (Effect of the fifth feature) According to the fifth characteristic, the amount of plastic material used can be significantly reduced compared to conventional moisture-proof sheets, and it can be said that the substrate 20 in the moisture-proof foam wallpaper 10 is a paper substrate.

[0057] (6th feature) The sixth characteristic is that the moisture-proof foam wallpaper 10 has a moisture permeability of 10.0 / m 2 The moisture permeability here refers to the moisture permeability specified in JIS Z 0208. (Effect of the 6th feature) According to the sixth characteristic, the moisture-proof foam wallpaper 10 according to the present embodiment can have a smaller moisture permeability than conventional vinyl chloride wallpaper or emulsion-type non-vinyl chloride wallpaper. 2 By setting the storage time to 24 hours or less, it was found that moisture-proof foam wallpaper 10 would not peel off even when stored for long periods of time. That is, according to the sixth feature, the moisture-proof layer 60 has been improved to suppress moisture permeability and prevent "peeling", allowing the wallpaper to withstand long-term storage at the construction site. Therefore, the moisture-proof foam wallpaper 10 can reliably withstand long-term storage after application of the construction glue. In addition, the moisture-proof foam wallpaper 10 has a moisture permeability of 0.1 g / m 2· If it is less than 24 hours, the glue may dry very slowly during application. Therefore, the moisture permeability is set to 0.1 g / m 2 -24 hours or more is preferable.

[0058] (7th feature) The seventh characteristic point is that the surface of the surface protection layer 50 opposite to the surface facing the picture-printed layer 40 has a concave-convex shape 51 formed by embossing. (Effect of the seventh feature point) According to the seventh characteristic, the unevenness 51 formed by the embossing process can improve the decorativeness of the moisture-proof foam wallpaper 10.

[0059] <Example> The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples in any way.

[0060] Example 1 The moisture-proof foam wallpaper of Example 1 had the following configuration. [Base material] The paper layer has a basis weight of 65 g / m 2A coating solution of polyvinyl alcohol resin with a saponification degree of 98% and a polymerization degree of 500 dissolved in a water / IPA=8 / 2 solution at a solid content concentration of 10% by mass was applied to the surface of the wallpaper backing paper (WK665IHT manufactured by KJ Specialty Paper Co., Ltd.) using a bar coater, and then dried in an oven to form a resin layer containing polyvinyl alcohol resin. The thickness of the resin layer was 3 μm.

[0061] Next, AL was deposited on the resin layer containing polyvinyl alcohol resin by vacuum deposition. The thickness of the AL deposition layer was 50 nm. Then, a coating liquid containing a carboxyl group salt (product name: Chemipearl S500, manufactured by Mitsui Chemicals) was applied onto the deposition layer using a bar coater and dried in an oven to form an overcoat layer containing polyolefin, thereby obtaining a moisture-proof layer. The thickness of the overcoat layer was 3 μm. This resulted in a substrate in which a moisture-proof layer was laminated on a paper layer.

[0062] [Foamed resin layer] The main component is ethylene-vinyl acetate copolymer resin (EVA resin), with 80 parts by mass of calcium carbonate and 10 parts by mass of capsule foaming agent added as fillers. The foaming ratio is set to 5 times, and the basis weight is 100 g / m 2 A foamed resin layer was formed on the substrate so as to obtain the following structure. Furthermore, the foamed resin layer contained an antibacterial agent (BC-477) at a mass ratio of 0.3% relative to the foamed resin layer.

[0063] [Picture printing layer] Acrylic resin ink is used, and the coating amount is 2g / m 2 A picture print layer was formed on the foamed resin layer so as to obtain the following structure.

[0064] [Surface protective layer] The main components are acrylic resin and silicone resin, with a basis weight of 5g / m 2 A surface protective layer was formed on the picture printed layer so as to obtain the following:

[0065] Example 2 Example 2 was obtained in the same manner as in Example 1, except that the thickness of the resin layer containing the polyvinyl alcohol resin was 1 μm.

[0066] Example 3 Example 3 was obtained in the same manner as in Example 1, except that the thickness of the overcoat layer was 2 μm.

[0067] Example 4 Example 4 was obtained in the same manner as in Example 1, except that the thickness of the overcoat layer was 10 μm.

[0068] Example 5 Example 5 was obtained in the same manner as in Example 1, except that the vapor-deposited layer was made of silica and had a thickness of 30 nm.

[0069] Example 6 Example 6 was obtained in the same manner as in Example 1, except that the vapor-deposited layer was made of alumina and had a thickness of 30 nm.

[0070] Comparative Example 1 Comparative Example 1 was obtained by the same procedure as in Example 1, except that a coating liquid containing a vinyl acetate-based polyolefin resin (product name: Chemipearl V300, manufactured by Mitsui Chemicals) was used instead of the coating liquid containing a polyvinyl alcohol resin.

[0071] Comparative Example 2 Comparative Example 2 was obtained in the same manner as in Example 1, except that no vapor deposition layer was provided on the moisture-proof layer of the substrate.

[0072] (Performance evaluation) The moisture-proof intumescent wallpapers of Examples 1 to 6 and Comparative Examples 1 and 2 were each subjected to a moisture permeability and delamination confirmation test. (1) Moisture permeability Compliant with JIS Z0208. (2) Phase peeling test A diluted paste of Yayoi Chemical's starch paste "Ruamild" (55:45: water) was applied at 120g / m2 to the side of the foam wallpaper base material. 2The adhesive was applied, folded with the adhesive sides facing each other, and sealed in a polyethylene bag. After 24 hours, the bag was opened and the presence or absence of breakage in the base layer was confirmed when the fold was unfolded.

[0073] [Table 1]

[0074] (Evaluation Results) As is clear from the results in Table 1, the moisture-proof foam wallpapers of Examples 1 to 6 had significantly lower moisture permeability than the moisture-proof foam wallpapers of Comparative Examples 1 and 2, and no peeling occurred even after long-term storage. On the other hand, the moisture-proof foamed wallpapers of Comparative Examples 1 and 2 had higher moisture permeability and broke in the phase peeling test compared to the moisture-proof foamed wallpapers of Examples 1 to 6. This is presumably because the coating liquid containing a polyvinyl alcohol resin in Comparative Example 1 was changed to a coating liquid containing a vinyl acetate polyolefin resin, and because no vapor deposition layer was provided in Comparative Example 2, which increased the moisture permeability. In this way, by improving the base layer of the moisture-proof foam wallpaper of the present invention, it is possible to suppress moisture permeability and thereby prevent peeling, giving it strong moisture resistance and enabling it to withstand long-term storage at the construction site after application of application glue. [Explanation of symbols]

[0075] 10. Moisture-proof foam wallpaper 20 Base material 30 Foamed resin layer 40 Pattern printing layer 50 Surface protective layer 51 Uneven shape 60 Moisture barrier 61 Resin layer 62 Deposited layer 63 Overcoat layer 70 paper layer

Claims

1. The present invention comprises a substrate, a foamed resin layer laminated on the substrate, a pattern printed layer laminated on the foamed resin layer, and a surface protective layer laminated on the pattern printed layer, The foamed resin layer is formed using an aqueous emulsion resin as a main component, The substrate has a paper layer and a moisture-proof layer laminated on one surface of the paper layer on the side of the foamed resin layer, the moisture-proof layer is formed by laminating a resin layer, a vapor deposition layer, and an overcoat layer in this order from the paper layer side; The resin layer contains a polyvinyl alcohol-based resin, The overcoat layer contains a polyolefin having at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride group, and a carboxylic ester. A moisture-proof foam wallpaper characterized by:

2. The thickness of the resin layer is 1 μm or more and 5 μm or less.

2. The moisture-proof foam wallpaper according to claim 1.

3. The thickness of the deposition layer is 30 nm or more and 100 nm or less.

3. The moisture-proof foam wallpaper according to claim 1 or 2.

4. The thickness of the overcoat layer is 2 μm or more and 10 μm or less.

4. The moisture-proof foam wallpaper according to claim 1, wherein the foam wallpaper is made of a material selected from the group consisting of polyester and polyester.

5. The weight of the paper layer is 50% by mass or more based on the entire moisture-proof layer.

5. The moisture-proof foam wallpaper according to claim 1,

6. Moisture permeability is 10.0 g / m ２ - Less than 24 hours 6. The moisture-proof foam wallpaper according to claim 1,

7. The surface of the surface protection layer opposite to the surface facing the pattern printed layer is formed with a concave-convex shape by embossing.

7. The moisture-proof foam wallpaper according to claim 1,

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