JP2009255499A - Moisture-proof sheet, warp-prevented wooden plate and decorative plate using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a moisture-proof sheet capable of preventing a warp of long fittings represented by a door such as a full height door and causing no separation or float of the moisture-proof sheet even when the sheet is used in a place where there is a big difference between temperature and humidity environments of both sides, even when the sheet is used for a long period of time, or even when external force is inevitably given to the sheet, and to provide a warp-prevented wooden plate and a decorative plate using the moisture-proof sheet. <P>SOLUTION: The moisture-proof sheet comprises a synthetic resin-made base material layer 10 and a vapor deposition layer 11, a primer layer 15 for adhesion being mounted on the vapor deposition surface, wherein a coupling agent is added to the primer layer for adhesion. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a moisture-proof sheet laminated on a wooden base material, and a warp-preventing wooden board and a decorative board using the same, and more specifically, prevents warping caused by moisture absorption and desorption of a wooden base material due to changes in environmental temperature and humidity. In addition to having a function to perform, the present invention relates to a moisture-proof sheet that can prevent the moisture-proof sheet from peeling off and floating from a wood-based substrate, and a warp-preventing wooden board and a decorative board using the moisture-proof sheet.

Conventionally, a decorative board in which a decorative sheet is laminated on the surface of a woody base material such as wood plywood, medium density fiber board (MDF), hard board, particle board, etc. has been used as a surface material for doors, sliding doors, partitions, etc. . If the moisture content of the wooden base material is lower than the equilibrium moisture content of the wooden base material under the open air condition, moisture absorption and water absorption will take place from the surface of the decorative board where the decorative sheet is not laminated, and this surface will be expanded. On the other hand, when the moisture content of the wooden base material is larger than the equilibrium moisture content of the wooden base material under the open air condition, the surface is laminated with the decorative sheet, while it is dehumidified and discharged. Since there is almost no moisture absorption and desorption, the surface of the decorative board laminated with the decorative sheet has a different expansion rate or contraction rate from the surface of the wooden base material, and the decorative board warps. As a result, the product value is reduced.

As a method for preventing such warping of the woody base material, for example, a method of sufficiently reinforcing the decorative plate so as not to be warped with metal or the like, or on the back side of the decorative plate in which a decorative sheet is laminated on the surface In order to prevent the moisture content of the wooden base material from changing due to moisture absorption and desorption from the back side of the decorative board, a method of applying paint, or vinyl chloride on the back side of the decorative board laminated with a decorative sheet on the surface,
A method of laminating sheets made of synthetic resin such as polyethylene and polypropylene, or a method of laminating moisture-proof sheets made of paper / polyethylene / paper (for example, see Patent Document 1) is known.

The above-described method of reinforcing the decorative plate can prevent warping by reinforcing, but it cannot prevent warping in the case of a structure such as a flash door that cannot be sufficiently reinforced. In addition, the method of painting a paint has a problem that it is difficult to form a uniform moisture-proof and waterproof layer due to strong suction of the paint on the surface of the wooden base material and poor surface smoothness. Yes, it can be applied to flash doors, and even if it is not perfect, it can prevent warping to some extent, so a method of laminating synthetic resin sheets or moisture-proof sheets is adopted and widely used. Has been.

However, even if it is a decorative board that adopts a method of laminating synthetic resin sheets or moisture-proof sheets, if it is used for a long time in doors, sliding doors, partitions, etc. that have a large difference in temperature and humidity environment on both sides, There is a difference in the moisture distribution of the base material between the one surface side and the other surface side. As a result, the degree of expansion or contraction is different on both surfaces, and warping may occur. As another problem, when a moisture-proof sheet is used, both sides are paper layers, and an excellent effect is obtained in terms of workability such that it can be easily laminated on a wooden base material with an emulsion type adhesive. On the other hand, since the interlayer strength of the paper layer is weak, there is a risk of peeling from the interlayer of the paper layer when used for a long period of time or when an external force is applied forcefully.

Therefore, the present applicant is required to use a moisture-proof sheet that has excellent moisture-proof performance and prevents warping and reducing the product value even when used in places where there is a large difference in environmental temperature and humidity on both sides of doors, sliding doors, partitions, etc. Proposed (Japanese Patent Application No. 2007-134971).

Since this moisture-proof sheet has a moisture permeability (JIS Z 0280) of 2.0 g / m 2 · 24 hr or less, it is compared with a synthetic resin sheet such as vinyl chloride, polyethylene and polypropylene, or a moisture-proof sheet made of paper / polyethylene / paper. The decorative board using the above moisture-proof sheet will warp even when used in places where there is a large difference in environmental temperature and humidity on both sides, such as doors, sliding doors, and partitions. In addition, there is almost no possibility of peeling when used for a long time or when an external force is applied forcefully.

However, in a door using a wooden base material (for example, MDF, particle board, etc.) that is likely to be warped or distorted, the four side surfaces are not fixed and exist in a substantially free state. For example, doors that reach the ceiling, which is easily affected by humidity, such as a full-height door, have a higher rate of warping and distortion. As a result, the moisture-proof sheet peels off and floats from the wooden substrate. There has been a fear of the occurrence, and there has been a demand for a moisture-proof sheet that can eliminate this, a warp-preventing wood board and a decorative board using the moisture-proof sheet.
JP 09-029919 A

Therefore, the present invention is a long joinery represented by a door called a full height door, even if it is used in a place where there is a large difference in temperature and humidity environment on both sides, and when used for a long time, It is to provide a moisture-proof sheet that prevents warping and prevents the moisture-proof sheet from peeling or floating even when an external force is applied forcefully, and a warp-preventing wooden board and a decorative board using the moisture-proof sheet.

In order to achieve the above object, the inventor of the present invention is characterized in that a vapor deposition layer is laminated on one surface side of a synthetic resin base material layer, and the other side of the synthetic resin base material layer. A moisture-proof sheet in which an adhesion primer layer is provided on at least one of the surface and the vapor deposition layer surface, wherein the adhesion primer layer is a layer to which a coupling agent is added. .

Further, in the present invention according to claim 2, the vapor deposition layer is laminated on one surface side of the synthetic resin base material layer,
A moisture-proof sheet in which a decorative sheet is laminated on the other surface of the synthetic resin base material layer via an adhesive layer, and an adhesion primer layer is provided on the vapor deposition layer surface, wherein the adhesion primer layer is a cup It is a layer formed by adding a ring agent.

Moreover, this invention of Claim 3 is a moisture-proof sheet | seat in any one of Claim 1, 2, The said coupling agent is a silane coupling agent, It is characterized by the above-mentioned.

  Moreover, the present invention according to claim 4 is characterized in that in the moisture-proof sheet according to any one of claims 1 to 3, a primer layer is provided between the synthetic resin base material layer and the vapor deposition layer. It is.

According to a fifth aspect of the present invention, there is provided a warp-preventing wood board according to the present invention, wherein the moisture-proof sheet according to the first aspect is attached to one surface of a wood-based base material with the adhesive primer layer interposed between the adhesive base layer and the wood-based base material. It is characterized by being laminated so as to be located on the side.

The decorative board of the present invention according to claim 6 is obtained by laminating the moisture-proof sheet according to claim 2 via an adhesive layer on the other surface of the wooden base material of the warp-preventing wooden board according to claim 5. It is characterized by.

The moisture-proof sheet of the present invention is a sheet composed of a synthetic resin base material layer and a vapor-deposited layer, has excellent moisture resistance, and is made of a synthetic resin such as vinyl chloride, polyethylene, or polypropylene, or a moisture-proof sheet composed of paper / polyethylene / paper. Compared to, in long fittings represented by doors such as full-height doors, which have outstanding moisture-proof performance, even when used in places where there is a large difference in temperature and humidity environment on both sides, Even when it is used for a long time or when external force is applied forcefully, it prevents warping and the moisture-proof sheet does not peel off or float due to the effect of the coupling agent added to the adhesive primer layer. This is an excellent effect.

The present invention will be described in detail below with reference to the drawings.
FIG. 1 is a layer configuration diagram schematically showing a first embodiment of a moisture-proof sheet according to the present invention, FIG. 2 is a layer configuration diagram schematically showing a second embodiment of the moisture-proof sheet according to the present invention, and FIG. FIG. 4 is a layer configuration diagram schematically showing an embodiment of a decorative board using the moisture-proof sheet of the present invention. FIG. 4 is a layer configuration diagram schematically showing an embodiment of the warp-preventing wood board using the moisture-proof sheet of the invention. 1 (a), 1 (b) in the figure is a moisture-proof sheet, 2 (a) is a warp-preventing wood board, 2 (b) is a decorative board, 10 is a synthetic resin base material layer,
11 is a vapor deposition layer, 12 and 19 are adhesive layers, 15 and 16 are adhesion primer layers, 20 is a wood-based substrate, and 30 is a decorative sheet.

FIG. 1 is a layer configuration diagram schematically showing a first embodiment of a moisture-proof sheet according to the present invention. The moisture-proof sheet 1 (a) is a primer layer (not shown) on one surface of a synthetic resin base material layer 10. ), The vapor deposition layer 11 and the adhesion primer layer 15 are formed, and the adhesion primer layer 16 is formed on the other surface of the synthetic resin base material layer 10. The adhesive primer layer 15 is laminated on a wooden base material to be a warp-preventing wooden board 2 (a) and a decorative board 2 (b), which will be described later, via an adhesive layer, and firmly adhered. The primer layer 16 for adhesion is finally provided, for example, when it is used as a door, and is firmly bonded to the door core through an adhesive layer. Is.

FIG. 2 is a layer configuration diagram schematically showing a second embodiment of the moisture-proof sheet according to the present invention. The moisture-proof sheet 1 (b) has a vapor deposition layer on one surface of the base layer 10 made of synthetic resin. 11 and the primer layer 15 for adhesion | attachment, and the decorative sheet 30 is laminated | stacked through the adhesive bond layer 12 on the other surface of the base material layer 10 made from a synthetic resin. The decorative sheet 30 includes the decorative sheet 3.
A known material having a specification in which the base sheet of 0 is made of paper or a specification made of a thermoplastic resin can be used, for example, Japanese Patent Publication No. 63-052580, Japanese Patent Laid-Open No. 06-0168.
No. 32, JP-A No. 11-207879, JP-A No. 2001-009972, JP-A No. 2003-276133, and the like can be used.

FIG. 3 is a layer configuration diagram schematically showing an embodiment of a warp-preventing wood board using the moisture-proof sheet of the present invention, and the warp-prevention wood board 2 (a) is one of the wood-based substrates 20. The moisture-proof sheet 1 (a) shown in FIG. 1 is laminated on the surface through an adhesive layer 19 so that the adhesion primer layer 16 is exposed. The warp-preventing wood board 2 (a) configured in this manner is provided with the moisture-proof sheet 1 (a) on one surface of the wood-based substrate 20, so that it absorbs the wood-based substrate 20 from one surface side. Moisture release can be prevented.

FIG. 4 is a layer configuration diagram schematically showing one embodiment of a decorative board using the moisture-proof sheet of the present invention. The decorative board 2 (b) is a warp-preventing wooden board 2 (a) shown in FIG. 2), the moisture-proof sheet 1 (b) shown in FIG. 2 is laminated via an adhesive layer 19 so that the decorative sheet 30 is exposed. The decorative board 2 (b) configured as described above can prevent moisture absorption and release from the woody base material from either side by the moisture-proof sheets 1 (a) and 1 (b).

Next, the moisture-proof sheets 1 (a) and 1 (b), the warp-preventing wood board 2 (a) and the decorative board 2 (
Various materials constituting b) will be described. First, as the base layer 10 made of synthetic resin, olefinic thermoplastic resin such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl alcohol copolymer, or a mixture thereof, polyethylene terephthalate, polybutylene. Ester thermoplastics such as terephthalate, polyethylene naphthalate, polyethylene naphthalate-isophthalate copolymer, polycarbonate, polyarylate, acrylic thermoplastics such as methyl polymethacrylate, ethyl polymethacrylate, butyl polyacrylate Examples thereof include non-halogen thermoplastic resins such as resin, polyimide, polyurethane, polystyrene, and acrylonitrile-butadiene-styrene resin. The synthetic resin base material layer 10 may be a uniaxial or biaxially oriented sheet, or may be unstretched, and a base material on which a vapor deposition layer 11 described later is formed on at least one surface; Therefore, a sheet stretched in the biaxial direction is preferable for reasons such as high mechanical strength and excellent dimensional stability. As the thickness of the synthetic resin base material layer 10,
A size of about 9 to 25 μm is appropriate. The necessary surface of the synthetic resin base material layer 10 is subjected to easy adhesion treatment such as corona discharge treatment, ozone treatment, and plasma treatment as necessary.

The vapor deposition layer 11 is an inorganic vapor deposition layer made of a metal thin film typified by aluminum, or an inorganic oxide vapor deposition layer made of an inorganic oxide thin film typified by silicon oxide, magnesium oxide, or aluminum oxide. The vapor deposition layer 11 is formed into a thin film on at least one surface of the synthetic resin substrate layer 10 by a known vapor deposition method such as a vacuum vapor deposition method or a plasma activated chemical reaction vapor deposition method. In addition, as the said vapor deposition layer 11, since the vapor deposition layer which consists of a metal thin film represented by aluminum has a metallic luster, the problem that a metallic luster must be concealed depending on a design, and also in the case of flash door processing In some cases, adhesion is performed using a high frequency, and an inorganic oxide vapor deposition layer in which the vapor deposition layer is transparent is more preferable. Further, for the purpose of further improving the gas barrier property of the vapor deposition layer 11, polyvinyl alcohol or polyvinyl alcohol with silicon oxide, magnesium oxide, oxidation on the vapor deposition layer 11 (surface on the side where the adhesion primer layer 15 abuts). A composition obtained by adding an inorganic oxide typified by aluminum may be formed by coating the polyvinyl alcohol layer or the composition layer by a known coating method such as a roll coating method or a gravure coating method.

In the present invention, a primer layer may be further provided between the synthetic resin base material layer 10 and the vapor deposition layer 11 in order to improve the adhesion between the synthetic resin base material layer 10 and the vapor deposition layer 11.
Examples of the resin used for the primer layer include ester resins, urethane resins, acrylic resins, polycarbonate resins, vinyl chloride-vinyl acetate copolymers, polyvinyl butyral resins, and nitrocellulose resins. These resins can be used alone or in combination. The primer layer can be formed using an appropriate application means such as a roll coating method or a gravure printing method.
Among these, the primer layer is preferably formed from a copolymer of an acrylic resin and a urethane resin and an isocyanate.

  In addition, as an application quantity after drying of the said primer layer, it is 1-20 g / m2, Preferably it is 1-5 g / m2. The primer layer may be a layer to which an additive such as a filler such as silica powder, a light stabilizer or a colorant is added as necessary.

Next, the adhesion primer layers 15 and 16 and the adhesive layer 12 will be described. Examples of the adhesive primer layers 15 and 16 and the adhesive layer 12 include ester resins, urethane resins, acrylic resins, polycarbonate resins, vinyl chloride-vinyl acetate copolymers, polyvinyl butyral resins, and nitrocellulose resins. These resins can be used alone or in combination as a main composition, and a resin obtained by adding an isocyanate as a curing agent to the appropriate composition such as a roll coating method or a gravure coating method. It can be formed using a coating means. And in this invention, especially the said primer layer 1 for adhesion | attachment
5 shows a large difference in the temperature and humidity environment on both sides in a long joinery represented by a door such as a full height door, which increases the adhesive strength between the vapor deposition layer 11 and the wood base material 20. Even if it is used in a certain place, or when it is used for a long time or when external force is applied forcefully, it prevents warping and peels or floats the moisture-proof sheets 1 (a) and 1 (b). In order to prevent this, a layer to which a coupling agent is added is used.

As a coupling agent to be added to the adhesion primer layer 15, an organic titanium coupling agent such as tetraalkoxy titanium, titanium acylate, titanium chelate, or the like,
Examples include organoaluminum coupling agents such as trialoxyaluminum, aluminum xylate, and aluminum acylate, and silane coupling agents that are organic-reactive group-containing organoalkoxysilanes. A coupling agent is preferable, and an organoalkoxysilane having an epoxy group is particularly suitable. For example, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, or β- (3 , 4-epoxycyclohexyl) ethyltrimethoxysilane and the like. Such silane coupling agents are
One type or two or more types may be used as a mixture, and the blending amount thereof is 0.1 to 10 weights as a resin content with respect to 100 parts by weight of the resin forming the adhesion primer layer 15. Within the range of the part is appropriate. The coating amount after drying of the adhesive primer layers 15 and 16 and the adhesive layer 12 is 1 to 20 g / m <2>, preferably 1 to 5 g / m <2>. Further, the adhesion primer layers 15 and 16 and the adhesive layer 12 may be layers to which an additive such as a filler such as silica powder, a light stabilizer or a colorant is added as necessary. In the description so far, the warp-preventing wood board 2 (a) and the decorative board 2 (b) in which the adhesion primer layer 15 is positioned on the wood-based substrate 20 side in the moisture-proof sheet 1 (a). However, it may be a warp-preventing wooden board or a decorative board so that the adhesion primer layer 16 is located on the wooden base material 20 side. In that case, at least the wooden base material 20 side is provided. A silane coupling agent may be added to the adhesive primer layer 16 positioned. Further, the addition of the coupling agent is performed by using the primer layer 15 for adhesion,
It may be added to any of the sixteen layers, and any of the layers may have an increased adhesive strength.

Next, the adhesive layer 19 will be described. The adhesive layer 19 is a layer used for laminating the moisture-proof sheets 1 (a) and 1 (b) and the wood base material 20, and as an adhesive forming the adhesive layer 19, for example, Any type of adhesive such as a thermoplastic resin, a thermosetting resin, or a rubber (elastomer) may be used. These are known ones or commercially available products can be appropriately selected and used. Examples of the thermoplastic resin adhesive include polyvinyl acetate resin, polyvinyl alcohol, polyvinyl acetal (polyvinyl formal, polyvinyl butyral, etc.), cyanoacrylate, polyvinyl alkyl ether, polyvinyl chloride, polyamide, polymethyl methacrylate, nitrocellulose. , Cellulose acetate, thermoplastic epoxy, polystyrene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, and the like. Thermosetting resin adhesives include urea resin, melamine resin, phenol resin, resorcinol resin, furan resin, epoxy resin, unsaturated polyester resin, polyurethane resin, polyimide resin, polyamideimide, polybenzimidazole, polybenzo Examples include thiazole. Also, as rubber-based adhesives, natural rubber, recycled rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, butyl rubber, polysulfide rubber,
Examples thereof include silicone rubber, polyurethane rubber, stereo rubber (synthetic natural rubber), ethylene propylene rubber, block copolymer rubber (SBS, SIS, SEBS, etc.). In particular, the adhesive layer 19 for laminating the moisture-proof sheet 1 (b) on which the decorative sheet is provided and the wooden base material 20 is a pigment for concealing the surface color of the wooden base material 20 and improving the design. It may be colored by, for example.

Moreover, as the wood base material 20, wood plywood, particle board, medium density fiberboard (MD
F), a woody base material such as a high-density fiberboard (HDF), and a base material having a flash structure.

  Next, the present invention will be described in more detail with reference to the following examples.

A 12 μm-thick biaxially stretched polyethylene terephthalate film (hereinafter referred to as “12 μm”) having an alumina vapor deposition layer formed on one surface and a polyvinyl alcohol coating formed on the vapor deposition layer surface.
After a corona discharge treatment is applied to the PET surface of a vapor-deposited PET film having a thickness of μm), a two-part curable resin in which an isocyanate as a curing agent is added to a urethane resin / nitrified cotton-based resin as a main agent is gravure printed The first adhesion primer layer having a thickness of 2 μm is formed by applying and drying by the method, and then 0% with respect to 100 parts by weight of the urethane resin / nitrified cotton-based resin as the main agent on the deposition surface side.
. 4 parts by weight of a silane coupling agent was added, and a two-component curable resin to which isocyanate as a curing agent was added was applied and dried by a gravure printing method to form a 2 μm-thick primer layer for second adhesion. A moisture-proof sheet was produced. After applying 7 to 8 g / scale 2 of vinyl acetate adhesive in a wet state on a 3 mm thick medium density fiberboard (MDF) and drying, the moisture-proof sheet is placed on the coated surface so that the vapor deposition layer side is located The warp-preventing wood board of the present invention was produced by laminating with a roll laminator.

[Comparative Example 1]
A warp-preventing wood board as a comparative example was prepared in the same manner as in Example 1 except that the second adhesion primer layer was formed without adding a silane coupling agent.

About the warp prevention wood board of Example 1 produced above and Comparative Example 1, water vapor permeability, plane tensile strength, and base material peeling strength were evaluated by the following evaluation methods, and the results are summarized in Table 1. .

〔Evaluation methods〕
・ Water permeability:
The moisture permeability was calculated by measuring the moisture-proof sheets of Example 1 and Comparative Example 1 in accordance with JIS Z 0208 “Moisture permeability test method for moisture-proof packaging material (cup method)”. In addition,
The unit of moisture permeability is g / m 2 · 24 hr.
・ Plane tensile strength:
JAS Plywood The plane tensile strength was calculated by measurement according to the plane tensile test. In addition,
The warp-preventing wood board used for the evaluation was obtained by cold-pressing the warp-prevention wood board prepared above for 24 hours, cutting the warp-prevention wood board into 5 cm square, and attaching a metal jig with a base of 2 cm square to a moisture-proof sheet. Attached to the surface with cyanoacrylate adhesive, cured for 24 hours at room temperature (about 23 ° C), cut with a cutter knife up to the MDF along the metal jig, and measured the test piece against the test piece. Then, the film was pulled in the direction of the vertical plane, and the peeling interface at that time was visually observed and evaluated, and the tensile strength was measured.
The unit of measurement is N / cm2.
・ Base material peeling strength:
The test piece is cut into a 1 inch width with a cutter knife and reaches the MDF from the moisture-proof sheet side, and a notch is made in the moisture-proof sheet by any method, and moisture-proof at a speed of 200 mm / min in the 180 ° direction by the measurement test equipment. The sheet was pulled, and the peeling interface at that time was visually observed and evaluated, and the tensile strength was measured. The test piece was measured at room temperature (23 ° C.) using the warp-prevented wood board produced above and cold-pressed for 24 hours, and the test piece was 1 inch wide with a cutter knife. Results of measurement in an atmosphere of -20 ° C after storing for 24 hours in a thermostatic layer (-20 ° C) with a notch reaching the MDF from the moisture-proof sheet side and making a notch in the moisture-proof sheet by any method Both (2) were shown.
The unit of measurement is N / inch.

As is apparent from Table 1, the moisture-proof sheet of the present invention is provided with an alumina vapor deposition layer, so that the moisture permeability performance is improved, and the decorative board warpage caused by changes in environmental temperature and humidity can be prevented. Not only can the effect of being able to be expected, but by adding a silane coupling agent to the adhesion primer layer on the vapor deposition layer side of the moisture-proof sheet, the adhesion strength between the moisture-proof sheet and MDF can be improved, Even if it is used in a place where there is a large difference in the temperature and humidity environment on both sides in a long fitting represented by a door such as a full height door, or when it is used for a long period of time or external force is forcefully generated Even when added, it is possible to expect an excellent effect of preventing warpage and preventing the moisture-proof sheet from peeling off or floating.

1 is a layer configuration diagram schematically illustrating a first embodiment of a moisture-proof sheet according to the present invention. It is a layer block diagram which shows 2nd Embodiment of the moisture-proof sheet | seat concerning this invention schematically. FIG. 2 is a layer configuration diagram schematically showing one embodiment of a warp-preventing wood board using the moisture-proof sheet of the present invention. FIG. 2 is a layer configuration diagram schematically showing one embodiment of a decorative board using the moisture-proof sheet of the present invention.

Explanation of symbols

1 (a), 1 (b) Moisture-proof sheet 2 (a) Warp-preventing wood board 2 (b) Decorative board 10 Synthetic resin base material layer 11 Vapor deposition layer 12, 19 Adhesive layer 15, 16 Adhesive primer layer 20 Wood Base material 30 decorative sheet

Claims (6)

A moisture-proof sheet in which a vapor deposition layer is laminated on one surface side of a synthetic resin base material layer, and an adhesion primer layer is provided on at least one of the other surface or the vapor deposition layer surface of the synthetic resin base material layer. A moisture-proof sheet, wherein the adhesion primer layer is a layer to which a coupling agent is added. A vapor deposition layer is laminated on one surface side of the synthetic resin base material layer, a decorative sheet is laminated on the other surface of the synthetic resin base material layer via an adhesive layer, and an adhesion primer is provided on the vapor deposition layer surface. A moisture-proof sheet provided with a layer, wherein the adhesion primer layer is a layer to which a coupling agent is added. The moisture-proof sheet according to claim 1, wherein the coupling agent is a silane coupling agent. The moisture-proof sheet according to any one of claims 1 to 3, further comprising a primer layer between the synthetic resin substrate layer and the vapor deposition layer. The warp characterized in that the moisture-proof sheet according to claim 1 is laminated on one side of a woody base material via an adhesive layer so that the adhesion primer layer is located on the woody base material side. Prevent wood board. A decorative board comprising the moisture-proof sheet according to claim 2 laminated on the other surface of the wood-based substrate of the warp-preventing wooden board according to claim 5 via an adhesive layer.

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