JP2013078955A - Decorative panel using moisture-proof decorative sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moisture-proof decorative sheet excellent in print reproducibility and designability, free from warping, and peeling and floating regardless of its use in a place having a large difference between temperature and humidity environments on its both sides, regardless of its long-term use and regardless of unavoidable exertion of external force thereto, and readily laminated on a wood-based base material, and to provide a decorative panel using the same.SOLUTION: In the moisture-proof decorative sheet, a print layer and a surface protective layer are laminated in order on another surface of a synthetic resin base material layer of a print base material with a vapor deposition layer laminated on one surface side of the synthetic resin base material layer, and a paper layer is laminated on a surface on the vapor deposition layer side via an adhesive layer.

Description

  The present invention relates to a moisture-proof decorative sheet laminated on a wooden substrate and a decorative board using the same, and more specifically, prevents warping caused by moisture absorption and moisture release of a wooden substrate due to changes in environmental temperature and humidity, and printing. The present invention relates to a moisture-proof decorative sheet having good reproducibility and excellent design, and a decorative board using the moisture-proof decorative 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.

  Therefore, a base material composed of a paper layer / synthetic resin layer / paper layer has come to be used as a decorative sheet for preventing warping of the decorative board. As the paper layer, a resin mixed paper obtained by mixing a resin with paper or a resin with paper. So-called inter-paper reinforced paper with improved inter-paper strength, such as resin-impregnated paper impregnated with styrene, is used as a synthetic resin layer, for example, a polyolefin-based polyolefin having moisture resistance as typified by polyethylene and polypropylene Resin is used, and further, for example, a printing layer on which a pattern such as a wood grain pattern is printed is provided on the surface of one of the paper layers, and a surface protective layer is provided on the entire surface on which the printing layer is formed. Things have come to be used.

  However, the decorative sheet composed of the above-mentioned surface protective layer / printing layer / paper layer / synthetic resin layer / paper layer has a smoothness of the surface of the paper layer on which the printing layer is provided of about 200 to 350 seconds, and has poor print reproducibility. This solution is not satisfactory in terms of design, and there is a strong demand for this solution.

As one technique for solving the above problem, by specifying a method for producing a paper layer / synthetic resin layer / paper layer, the surface smoothness of the paper layer is improved, and the paper having improved surface smoothness A decorative sheet having a good print reproducibility and an excellent design property by printing on the layer surface is disclosed (for example, see Patent Document 1).
Although the technique disclosed in Patent Document 1 can surely improve the print reproducibility and be excellent in design, the substrate to be printed is a resin mixed paper or inter-paper reinforced paper. The decorative sheet made of a paper layer / synthetic resin layer / paper layer is inferior to the decorative sheet in which the printing substrate is made of a synthetic resin sheet and the printed layer is formed on the synthetic resin sheet. In terms of moisture-proof performance, decorative sheets made of paper / synthetic resin / paper layers have a large difference in environmental temperature and humidity on both sides, such as doors, sliding doors, partitions, etc. When used for a period of time, or when an external force is applied forcefully, there is a problem of warping and a problem of peeling from the paper layer.

  However, when a decorative sheet made of a paper layer / synthetic resin layer / paper layer is laminated on a wooden base material to make a decorative sheet, the decorative sheet is made of a synthetic resin sheet. In addition, there is an advantage that it can be easily laminated with an adhesive for woodwork, which is usually widely used in the industry.

JP 2001-171063 A

  Therefore, the present invention has good print reproducibility and excellent design, even when used in a place where there is a large difference in the temperature and humidity environment on both sides, when used for a long time, or when external force is applied forcefully. Another object of the present invention is to provide a moisture-proof decorative sheet and a decorative board using the moisture-proof decorative sheet that can prevent warping, do not peel off or float, and can be easily laminated on a wooden base material.

  In order to achieve the above-mentioned object, the inventor of the present invention provides the moisture-proof decorative sheet according to the first aspect of the present invention, in which the printed substrate having the vapor-deposited layer laminated on one surface side of the synthetic resin substrate layer is synthesized. A printed layer and a surface protective layer are sequentially laminated on the other surface of the resin base material layer, and a paper layer is laminated on the surface on the vapor deposition layer side through an adhesive layer. is there.

  In the decorative board of the present invention according to claim 2, the moisture-proof decorative sheet according to claim 1 is such that the surface protective layer is exposed on one surface of the wooden base material via an adhesive layer for the wooden base material. It is characterized by being laminated.

  The moisture-proof decorative sheet of the present invention and the decorative board using the same are composed of a printing substrate in which a vapor deposition layer is laminated on one surface side of a synthetic resin substrate layer, and the printing substrate is a paper layer / synthetic resin layer / Compared to decorative sheets made of paper layers, it has much better moisture-proof performance, and it can be used in places where there is a large difference in temperature and humidity environments on both sides. When added, the printed layer is a paper layer in order to prevent warping and to prevent peeling or floating, and to form a printed layer on the other surface of the synthetic resin base material layer. As compared with the case of forming the film, the effect of being able to be improved in print reproducibility and excellent in design properties, and further, the moisture-proof decorative sheet of the present invention has an adhesive layer on the surface on the vapor deposition layer side. Since the paper layer is composed of Lamination is easy, in which an effect that excellent workability at the time of the veneer.

It is a layer block diagram which shows one Example of the moisture-proof decorative sheet concerning this invention schematically. It is a layer block diagram which shows one Example of the decorative board concerning this invention schematically.

The above-described present invention will be described in detail below with reference to the drawings.
FIG. 1 is a layer configuration diagram schematically illustrating one embodiment of a moisture-proof decorative sheet according to the present invention, and FIG. 2 is a layer configuration diagram schematically illustrating one embodiment of a decorative plate according to the present invention. DESCRIPTION OF SYMBOLS 1 is a moisture-proof decorative sheet, 2 is a decorative board, 8 is a surface protective layer, 9 is a printing layer, 10 is a synthetic resin base material layer, 11 is a vapor deposition layer, 12 is an adhesive layer, 13 is a paper layer, 14 is woody An adhesive layer for a base material, 15 is a woody base material, and S is a printing base material.

  FIG. 1 is a layer configuration diagram schematically showing an embodiment of a moisture-proof decorative sheet according to the present invention. The moisture-proof decorative sheet 1 has a vapor-deposited layer 11 laminated on one surface of a base layer 10 made of synthetic resin. A printing layer 9 and a surface protective layer 8 are sequentially laminated on the other surface of the synthetic resin substrate layer 10 of the printing substrate S, and a paper layer 13 is disposed on the surface on the vapor deposition layer 11 side through an adhesive layer. Laminated.

  FIG. 2 is a diagram showing the layer structure schematically showing one embodiment of the decorative board according to the present invention. The decorative board 2 is formed so that the moisture-proof decorative sheet 1 shown in FIG. The laminate is laminated on the woody base material 15 via the woody base material adhesive layer 14.

  The moisture-proof decorative sheet and decorative board of the present invention shown in FIGS. 1 and 2 are excellent in moisture-proof performance and print reproducibility, and also when a moisture-proof decorative sheet is laminated on a wooden base material to make a decorative board, It can be handled by a woodworking manufacturing apparatus, and has the effect of being excellent in workability.

  Next, various materials constituting the moisture-proof decorative sheet 1 and the decorative board 2 of the present invention 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. Therefore, a sheet stretched in the biaxial direction is preferable for reasons such as high mechanical strength and excellent dimensional stability. The thickness of the synthetic resin substrate layer 10 is generally 9 to 25 μm. 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, aluminum oxide on the vapor deposition layer 11 (surface on the side where the adhesive layer 12 abuts). A polyvinyl alcohol layer or the composition layer may be formed by coating a composition containing an inorganic oxide represented by the above by a known coating method such as a roll coating method or a gravure coating method.

Further, as the paper layer 13, printing paper for building materials (thin paper for building materials), pure white paper, or resin mixed paper in which interlayer strength is increased by mixing synthetic resin or resin impregnation in which interlayer strength is increased by impregnation with resin. An inter-paper reinforcing paper such as paper can be mentioned, and the basis weight is generally about 23 to 100 g / m ² . In addition, the above-described various papers may be subjected to appropriate easy adhesion treatment such as corona discharge treatment, plasma treatment, ozone treatment, etc. on necessary surfaces as necessary.

Moreover, what is necessary is just to form as the adhesive bond layer 12 which laminates | stacks the said vapor deposition layer 11 and the said paper layer 13 with a well-known application | coating means using the 2 liquid curing type polyurethane adhesive which consists of a polyol component and an isocyanate component. Examples of the polyol component include polyester polyol, polyester polyurethane polyol, polyether polyol, polyether polyurethane polyol, and the like. Examples of the isocyanate component include diisocyanates such as TDI, MDI, HDI, PIDI, and XDI, and starting materials thereof. And may be formed using an appropriate coating means such as a roll coating method or a gravure coating method. The coating amount is from 1 to 20 g / m ^2, preferably from 1 to 5 g / m ^2.

  Next, the printing layer 9 and the surface protective layer 8 formed on the other surface of the synthetic resin base material layer 10 will be described. The printing layer 9 can be formed using ink by a known printing method such as a gravure printing method, an offset printing method, or a silk screen printing method. For example, a wood grain pattern, a stone pattern, a cloth pattern, a skin pattern It consists of a pattern print layer such as a pattern, a geometric pattern, characters, symbols, line drawings, various abstract patterns, and / or a solid pattern print layer having concealment. Examples of the ink for forming the printing layer 9 include chlorinated polyolefins such as chlorinated polyethylene and chlorinated polypropylene as a vehicle, polyester, polyurethane composed of isocyanate and polyol, polyacryl, polyvinyl acetate, polyvinyl chloride, and vinyl chloride. It can be used by mixing one or more kinds of vinyl acetate copolymer, cellulose resin, polyamide resin, etc., and adding it to pigments, solvents, various auxiliary agents, etc. to make it into an ink. In view of the above, a non-chlorine vehicle in which one or two or more of polyester, polyurethane, polyacrylic, polyvinyl acetate, cellulose resin, polyamide resin, and the like, which are composed of isocyanate and polyol are mixed, is more preferable. Polyester, isocyanate and polyol Ranaru polyurethane, polyacrylic, is a mixture one or two or more kinds of such polyamide-based resin.

The surface protective layer 8 is provided for imparting surface physical properties such as scratch resistance, abrasion resistance, contamination resistance, water resistance, and weather resistance required for the moisture-proof decorative sheet 1 and the decorative board 2. The resin for forming the surface protective layer 5 is suitably formed using a curable resin such as a thermosetting resin or an ionizing radiation curable resin. In general, 1 to 20 g / m ² is appropriate per minute.

  As thermosetting resins, unsaturated polyester resins, polyurethane resins (including two-component curable polyurethane), epoxy resins, amino alkyd resins, phenol resins, urea resins, diallyl phthalate resins, melamine resins, guanamine resins, melamine-ureas Examples thereof include a cocondensation resin, a silicon resin, and a polysiloxane resin. If necessary, a curing agent such as a crosslinking agent or a polymerization initiator, or a polymerization accelerator is added to the resin. For example, as a curing agent, isocyanate or organic sulfonate is added to unsaturated polyester resin or polyurethane resin, organic amine is added to epoxy resin, peroxide such as methyl ethyl ketone peroxide, azoisobutyl nitrile, etc. The radical initiator is added to the unsaturated polyester resin. As a method of forming the surface protective layer with the thermosetting resin, for example, the above thermosetting resin is made into a solution, applied by a known coating method such as a roll coating method or a gravure coating method, dried and cured. Can be formed.

  The ionizing radiation curable resin is a resin that undergoes a cross-linking polymerization reaction upon irradiation with ionizing radiation and changes to a three-dimensional polymer structure. Ionizing radiation means an electromagnetic wave or charged particle beam having an energy quantum capable of polymerizing and crosslinking molecules, such as visible light, ultraviolet light (near ultraviolet light, vacuum ultraviolet light, etc.), X-ray, electron beam, ion beam, etc. is there. Usually, ultraviolet rays or electron beams are used. As the ultraviolet light source, a light source such as an ultra-high pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc lamp, a black light fluorescent lamp, or a metal halide lamp can be used. As the wavelength of the ultraviolet light, a wavelength range of 190 to 380 nm can be used. As the electron beam source, various electron beam accelerators such as a cockcroft-wald type, a bandegraft type, a resonant transformer type, an insulated core transformer type, a linear type, a dynamitron type, and a high frequency type can be used. The electron beam used is 100 to 1000 keV, preferably 100 to 300 keV. The irradiation amount of the electron beam is usually about 2 to 15 Mrad.

  As the ionizing radiation curable resin, a monomer having a radically polymerizable unsaturated group such as (meth) acryloyl group or (meth) acryloyloxy group or a cationically polymerizable functional group such as epoxy group in the molecule, It consists of a polymer or polymer. These monomers, prepolymers or polymers are used alone or in combination. In this specification, (meth) acrylate is used in the meaning of acrylate or methacrylate. The ionizing radiation means an electromagnetic wave or charged particle beam having an energy quantum capable of polymerizing or cross-linking molecules, and is usually an ultraviolet ray or an electron beam.

  Examples of the prepolymer having a radical polymerizable unsaturated group include polyester (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, melamine (meth) acrylate, triazine (meth) acrylate, and polyvinylpyrrolidone. This prepolymer usually has a molecular weight of about 10,000 or less. When the molecular weight exceeds 10,000, the cured resin layer has insufficient surface properties such as scratch resistance, abrasion resistance, chemical resistance, and heat resistance. The acrylate and methacrylate can be used in common, but the acrylate is more advantageous for the purpose of curing efficiently at a high speed and in a short time because the acrylate is faster in terms of the crosslinking curing rate with ionizing radiation. .

  Examples of the prepolymer having a cationically polymerizable functional group include epoxy resins such as bisphenol type epoxy resins, novolac type epoxy resins, and alicyclic epoxy resins, aliphatic vinyl ethers, aromatic vinyl ethers, urethane vinyl ethers, and ester vinyl ethers. And prepolymers such as vinyl ether resins, cyclic ether compounds, and spiro compounds.

  Examples of monomers having a radically polymerizable unsaturated group include (meth) acrylate compound monofunctional monomers such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, methoxyethyl ( (Meth) acrylate, methoxybutyl (meth) acrylate, butoxyethyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, N, N-dimethylaminomethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, N , N-diethylaminoethyl (meth) acrylate, N, N-diethylaminopropyl (meth) acrylate, N, N-dibenzylaminoethyl (meth) acrylate, lauryl (meth) acrylate, isobornyl (meth) acrylate, ethyl carbitol ( Me ) Acrylate, phenoxyethyl (meth) acrylate, phenoxypolyethylene glycol (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, methoxypropylene glycol (meth) acrylate, 2- (meth) acryloyloxyethyl-2-hydroxypropyl phthalate, 2 -(Meth) acryloyloxypropyl hydrogen terephthalate and the like.

  In addition, as a polyfunctional monomer having a radical polymerizable unsaturated group, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, di Propylene glycol (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, tri Propylene glycol di (meth) acrylate, bisphenol-A-di (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane ethylene oxide tri (meth) acrylate , Pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, glycerin polyethylene oxide tri (meth) acrylate, tris (meth) acryloyloxy Examples thereof include ethyl phosphate.

  As the monomer having a cationic polymerizable functional group, a prepolymer monomer having the cationic polymerizable functional group can be used.

  When the above-mentioned ionizing radiation curable resin is cured by irradiating with ultraviolet rays, a photopolymerization initiator is added as a sensitizer. In the case of a resin system having a radically polymerizable unsaturated group, photoinitiators include acetophenones, benzophenones, thioxanthones, benzoin, benzoin, benzoin methyl ether, Michler benzoylbenzoate, Michler ketone, diphenyl sulfide, dibenzyl disulfide , Diethyl oxide, triphenylbiimidazole, isopropyl-N, N-dimethylaminobenzoate and the like can be used alone or in combination. In the case of a resin system having a cationically polymerizable functional group, an aromatic diazonium salt, an aromatic sulfonium salt, a metallocene compound, a benzoin sulfonate ester, a freeloxyxonium diallyl iodosyl salt, etc., should be used alone or as a mixture. Can do. In addition, generally the addition amount of these photoinitiators is about 0.1-10 weight part with respect to 100 weight part of ionizing radiation curable resins.

  Next, the wood base adhesive layer 14 for laminating the moisture-proof decorative sheet 1 and the wood base 15 to be described later will be described. The wood-based base material adhesive layer 14 is a layer used for laminating the moisture-proof decorative sheet 1 and the wood-based base material 15, and as the adhesive that forms the wood-based base material adhesive layer 14, For example, any type of adhesive such as a thermoplastic resin system, a thermosetting resin system, and a rubber (elastomer) system 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. Rubber-based adhesives include natural rubber, recycled rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, butyl rubber, polysulfide rubber, silicone rubber, polyurethane rubber, stereo rubber (synthetic natural rubber), and ethylene propylene rubber. And block copolymer rubbers (SBS, SIS, SEBS, etc.). Further, for the purpose of concealing the surface color of the wooden substrate 15 and improving the design, the wooden substrate adhesive layer 14 may be colored with a pigment or the like.

  Further, examples of the woody base material 15 include woody base materials such as wood plywood, particle board, medium density fiber board (MDF), and high density fiber board (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.

[Example 1]
A 12 μm-thick biaxially stretched polyethylene terephthalate film (hereinafter referred to as a 12 μm-thick vapor-deposited PET film) in which an alumina vapor-deposited layer is formed on one surface and polyvinyl alcohol is coated and formed on the vapor-deposited layer surface On the side surface, a two-component curable adhesive comprising polyester polyol as a main component and isocyanate added as a curing agent was applied in a wet state at 3 to 4 g / scale ² and dried, and 30 g / m ² on the adhesive surface was dried. A laminate was produced by laminating paper-reinforced paper [Oji Specialty Paper Co., Ltd .: Uflex 30 (trade name)]. After performing corona discharge treatment on the PET surface of the laminate, a printing ink having a two-part curable resin mainly composed of nitrified cotton-based resin and isocyanate added as a curing agent on the corona discharge treatment surface is used. After printing and forming a solid pattern printing layer consisting of a solid pattern, and printing and printing a pattern printing layer consisting of a wood grain pattern using a printing ink with a nitrified cotton-based resin as a vehicle, the entire surface of the printing layer Then, a two-component curable resin in which an isocyanate was added as a curing agent to an acrylic polyol-based resin as a main agent was applied by a gravure printing method to produce a moisture-proof decorative sheet in which a transparent surface protective layer was formed. Next, 7-8 g / scale ^{2 of} vinyl acetate adhesive is applied in a wet state to a 3 mm-thick medium density fiberboard (MDF), and after drying, the moisture-proof decorative sheet is applied to the coated surface with a surface protective layer. The laminate of the present invention was produced by laminating with a roll laminator as shown.
[Comparative Example 1]
23 g / m ² inter-paper reinforced paper (Oji Special Paper Co., Ltd .: Fix23 (trade name)) and 30 g / m ² inter-paper reinforced paper [Oji Special Paper ( U-Flex 30 (trade name)] is sandwich-laminated with a 40 μm-thick polyethylene resin so that the corona discharge-treated surfaces face each other, and inter-paper reinforced paper (23 g / m ² ) / polyethylene (40 μm ) / Paper reinforced paper (30 g / m ² ) printed substrate. Next, using a printing ink having a vehicle made of a two-part curable resin mainly composed of nitrified cotton-based resin and added with isocyanate as a curing agent on the inter-paper reinforced paper (30 g / m ² ) surface of the printing substrate, After printing and forming a solid pattern printing layer consisting of a solid pattern, and printing and printing a pattern printing layer consisting of a wood grain pattern using a printing ink with a nitrified cotton-based resin as a vehicle, the entire surface of the printing layer Then, a moisture-proof decorative sheet was prepared as a comparative example in which a two-part curable resin in which isocyanate was added as a curing agent to an acrylic polyol resin as a main agent was applied by a gravure printing method to form a transparent surface protective layer. Next, 7-8 g / scale ^{2 of} vinyl acetate adhesive is applied in a wet state to a 3 mm-thick medium density fiberboard (MDF), and after drying, the moisture-proof decorative sheet is applied to the coated surface with a surface protective layer. A decorative board as a comparative example was produced by laminating with a roll laminator as shown.

  About the moisture-proof decorative sheet and decorative plate of Example 1 and Comparative Example 1 prepared above, the moisture permeability, plane tensile strength, and surface design (tone reproducibility) were evaluated by the following evaluation methods, and the results are shown. It is summarized in 1.

〔評価方法〕
・透湿度：
ＪＩＳ Ｚ ０２０８「防湿包装材料の透湿度試験方法（カップ法）」に準拠し
て実施例１、および、比較例１の防湿化粧シートを測定して透湿度を算出した。

〔Evaluation method〕
・ Water permeability:
The moisture permeability was calculated by measuring the moisture-proof decorative 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)”.

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 decorative board used for the evaluation was obtained by cold pressing the decorative board prepared above for 24 hours, cutting the decorative board into 5 cm square, and attaching a metal jig with a 2 cm square base to the moisture-proof sheet surface. After pasting with an agent and curing at room temperature (about 23 ° C) for 24 hours,
Using a cutter knife, make a notch that reaches the MDF along the metal jig, pull it in the direction perpendicular to the test piece with the measuring test equipment, and visually observe and evaluate the peeled interface at that time, and evaluate the tensile strength. It was measured.

The unit of measurement is N / cm ² .
・ Surface design (tone reproducibility)
In the visual evaluation, those with good tone reproducibility were indicated as “good” by ○, and those with poor ink depositability and inferior tone reproducibility were indicated as “poor” by evaluation.

  As is apparent from Table 1, the moisture-proof decorative sheet and decorative plate of the present invention are provided with an alumina vapor-deposited layer, so that the moisture permeability performance is improved and the decorative plate warp caused by changes in environmental temperature and humidity is observed. Not only can the effect that it can be prevented be expected, but also the adhesive strength between the moisture-proof decorative sheet and the MDF can be improved, and even when used in a place where there is a large difference in the temperature and humidity environment on both sides, Even when used for a long period of time or when an external force is applied forcefully, an excellent effect of preventing warpage and preventing the moisture-proof decorative sheet from peeling or floating can be expected. Furthermore, by replacing the printing base material with the base layer made of synthetic resin from the paper layer, ink inking property is improved, printing reproducibility (tone reproducibility) is good, and design is to be excellent. it can.

DESCRIPTION OF SYMBOLS 1 Moisture-proof decorative sheet 2 Decorative plate 8 Surface protective layer 9 Printing layer 10 Synthetic resin base material layer 11 Vapor deposition layer 12 Adhesive layer 13 Paper layer 14 Woody base material adhesive layer 15 Woody base material S Printing base material

The present invention relates to a decorative board using the moisture-proof decorative sheet laminated to wood-based substrate, more particularly, as well as prevent warping caused by moisture absorption and desorption of wood base materials due to changes in environmental temperature and humidity, reproduction in printing sex good, the present invention relates to decorative plate used the excellent moisture-proof cosmetic sheet design property.

  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.

  Therefore, a base material composed of a paper layer / synthetic resin layer / paper layer has come to be used as a decorative sheet for preventing warping of the decorative board. As the paper layer, a resin mixed paper obtained by mixing a resin with paper or a resin with paper. So-called inter-paper reinforced paper with improved inter-paper strength, such as resin-impregnated paper impregnated with styrene, is used as a synthetic resin layer, for example, a polyolefin-based polyolefin having moisture resistance as typified by polyethylene and polypropylene Resin is used, and further, for example, a printing layer on which a pattern such as a wood grain pattern is printed is provided on the surface of one of the paper layers, and a surface protective layer is provided on the entire surface on which the printing layer is formed. Things have come to be used.

  However, the decorative sheet composed of the above-mentioned surface protective layer / printing layer / paper layer / synthetic resin layer / paper layer has a smoothness of the surface of the paper layer on which the printing layer is provided of about 200 to 350 seconds, and has poor print reproducibility. This solution is not satisfactory in terms of design, and there is a strong demand for this solution.

  As one technique for solving the above problem, by specifying a method for producing a paper layer / synthetic resin layer / paper layer, the surface smoothness of the paper layer is improved, and the paper having improved surface smoothness A decorative sheet having a good print reproducibility and an excellent design property by printing on the layer surface has been disclosed (for example, see Patent Document 1).

  Although the technique disclosed in Patent Document 1 can surely improve the print reproducibility and be excellent in design, the substrate to be printed is a resin mixed paper or inter-paper reinforced paper. The decorative sheet made of a paper layer / synthetic resin layer / paper layer is inferior to the decorative sheet in which the printing substrate is made of a synthetic resin sheet and the printed layer is formed on the synthetic resin sheet. In terms of moisture-proof performance, decorative sheets made of paper / synthetic resin / paper layers have a large difference in environmental temperature and humidity on both sides, such as doors, sliding doors, partitions, etc. When used for a period of time, or when an external force is applied forcefully, there is a problem of warping and a problem of peeling from the paper layer.

  However, when a decorative sheet made of a paper layer / synthetic resin layer / paper layer is laminated on a wooden base material to make a decorative sheet, the decorative sheet is made of a synthetic resin sheet. In addition, there is an advantage that it can be easily laminated with an adhesive for woodwork, which is usually widely used in the industry.

JP 2001-171063 A

Therefore, the present invention has good print reproducibility and excellent design, even when used in a place where there is a large difference in the temperature and humidity environment on both sides, when used for a long time, or when external force is applied forcefully. also, it is possible to prevent warping, without peeling or lifting may occur, also, to provide a decorative plate using the moisture-proof decorative sheet which can be easily laminated to the wood-based substrate.

In order to achieve the above-mentioned object, the present inventor is a decorative board using the moisture-proof decorative sheet according to the first aspect of the present invention, in which a vapor deposition layer is laminated on one surface side of a synthetic resin base material layer. A moisture-proof makeup in which a printed layer and a surface protective layer are sequentially laminated on the other surface of the synthetic resin substrate layer of the substrate, and a paper layer is laminated on the surface on the vapor deposition layer side through an adhesive layer The sheet is laminated such that the surface protective layer is exposed on one surface of the wooden base material via the adhesive layer for the wooden base material .

Decorative plate using the moisture-proof decorative sheet of the present invention will become deposited layer on one surface of the synthetic resin substrate layer is a laminated print substrate, printing substrate paper layer / plastic layer / paper Even if it is used in a place where there is a large difference in temperature and humidity environment on both sides, and when it is used for a long time, or external force is applied forcefully In this case, the printed layer is formed on the paper layer in order to prevent warping and to prevent peeling or floating, and to form the printed layer on the other surface of the synthetic resin base material layer. Compared to the case of forming, it has the effect that the printing reproducibility is good and can be excellent in design, and the moisture-proof decorative sheet used for the decorative board of the present invention is bonded to the surface on the vapor deposition layer side. Since the paper layer is laminated via the agent layer, Laminated with is easy, in which an effect that excellent workability at the time of the veneer.

It is a layer block diagram which shows typically one Example of the moisture-proof decorative sheet used for the decorative board concerning this invention. It is a layer block diagram which shows one Example of the decorative board concerning this invention schematically.

The above-described present invention will be described in detail below with reference to the drawings.
FIG. 1 is a layer configuration diagram schematically illustrating one embodiment of a moisture-proof decorative sheet used for a decorative board according to the present invention, and FIG. 2 is a layer configuration diagram schematically illustrating one embodiment of a decorative board according to the present invention. In the figure, 1 is a moisture-proof decorative sheet, 2 is a decorative board, 8 is a surface protective layer, 9 is a printed layer, 10 is a synthetic resin base material layer, 11 is a vapor deposition layer, 12 is an adhesive layer, and 13 is a paper layer. , 14 is an adhesive layer for a wooden substrate, 15 is a wooden substrate, and S is a printing substrate.

FIG. 1 is a layer configuration diagram schematically showing one embodiment of a moisture-proof decorative sheet used for a decorative board according to the present invention. The moisture-proof decorative sheet 1 is a vapor deposition layer 11 on one surface of a synthetic resin base material layer 10. A printing layer 9 and a surface protective layer 8 are laminated in this order on the other surface of the synthetic resin substrate layer 10 of the printing substrate S on which is laminated, and an adhesive layer is interposed on the surface on the vapor deposition layer 11 side. A paper layer 13 is laminated.

  FIG. 2 is a diagram showing the layer structure schematically showing one embodiment of the decorative board according to the present invention. The decorative board 2 is formed so that the moisture-proof decorative sheet 1 shown in FIG. The laminate is laminated on the woody base material 15 via the woody base material adhesive layer 14.

The moisture-proof decorative sheet and decorative plate used for the decorative board of the present invention shown in FIGS. 1 and 2 are excellent in moisture-proof performance and print reproducibility, and also when the moisture-proof decorative sheet is laminated on a wooden base material to make a decorative board. It can be handled by a system adhesive or a woodworking manufacturing apparatus, and has an effect of being excellent in workability.

  Next, various materials constituting the moisture-proof decorative sheet 1 and the decorative board 2 of the present invention 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. Therefore, a sheet stretched in the biaxial direction is preferable for reasons such as high mechanical strength and excellent dimensional stability. The thickness of the synthetic resin substrate layer 10 is generally 9 to 25 μm. 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, aluminum oxide on the vapor deposition layer 11 (surface on the side where the adhesive layer 12 abuts). A polyvinyl alcohol layer or the composition layer may be formed by coating a composition containing an inorganic oxide represented by the above by a known coating method such as a roll coating method or a gravure coating method.

Further, as the paper layer 13, printing paper for building materials (thin paper for building materials), pure white paper, or resin mixed paper in which interlayer strength is increased by mixing synthetic resin or resin impregnation in which interlayer strength is increased by impregnation with resin. An inter-paper reinforcing paper such as paper can be mentioned, and the basis weight is generally about 23 to 100 g / m ² . In addition, the above-described various papers may be subjected to appropriate easy adhesion treatment such as corona discharge treatment, plasma treatment, ozone treatment, etc. on necessary surfaces as necessary.

Moreover, what is necessary is just to form as the adhesive bond layer 12 which laminates | stacks the said vapor deposition layer 11 and the said paper layer 13 with a well-known application | coating means using the 2 liquid curing type polyurethane adhesive which consists of a polyol component and an isocyanate component. Examples of the polyol component include polyester polyol, polyester polyurethane polyol, polyether polyol, polyether polyurethane polyol, and the like. Examples of the isocyanate component include diisocyanates such as TDI, MDI, HDI, PIDI, and XDI, and starting materials thereof. And may be formed using an appropriate coating means such as a roll coating method or a gravure coating method. The coating amount is from 1 to 20 g / m ^2, preferably from 1 to 5 g / m ^2.

  Next, the printing layer 9 and the surface protective layer 8 formed on the other surface of the synthetic resin base material layer 10 will be described. The printing layer 9 can be formed using ink by a known printing method such as a gravure printing method, an offset printing method, or a silk screen printing method. For example, a wood grain pattern, a stone pattern, a cloth pattern, a skin pattern It consists of a pattern print layer such as a pattern, a geometric pattern, characters, symbols, line drawings, various abstract patterns, and / or a solid pattern print layer having concealment. Examples of the ink for forming the printing layer 9 include chlorinated polyolefins such as chlorinated polyethylene and chlorinated polypropylene as a vehicle, polyester, polyurethane composed of isocyanate and polyol, polyacryl, polyvinyl acetate, polyvinyl chloride, and vinyl chloride. It can be used by mixing one or more kinds of vinyl acetate copolymer, cellulose resin, polyamide resin, etc., and adding it to pigments, solvents, various auxiliary agents, etc. to make it into an ink. In view of the above, a non-chlorine vehicle in which one or two or more of polyester, polyurethane, polyacrylic, polyvinyl acetate, cellulose resin, polyamide resin, and the like, which are composed of isocyanate and polyol are mixed, is more preferable. Polyester, isocyanate and polyol Ranaru polyurethane, polyacrylic, is a mixture one or two or more kinds of such polyamide-based resin.

The surface protective layer 8 is provided for imparting surface physical properties such as scratch resistance, abrasion resistance, contamination resistance, water resistance, and weather resistance required for the moisture-proof decorative sheet 1 and the decorative board 2. The resin for forming the surface protective layer 5 is suitably formed using a curable resin such as a thermosetting resin or an ionizing radiation curable resin. In general, 1 to 20 g / m ² is appropriate per minute.

  As thermosetting resins, unsaturated polyester resins, polyurethane resins (including two-component curable polyurethane), epoxy resins, amino alkyd resins, phenol resins, urea resins, diallyl phthalate resins, melamine resins, guanamine resins, melamine-ureas Examples thereof include a cocondensation resin, a silicon resin, and a polysiloxane resin. If necessary, a curing agent such as a crosslinking agent or a polymerization initiator, or a polymerization accelerator is added to the resin. For example, as a curing agent, isocyanate or organic sulfonate is added to unsaturated polyester resin or polyurethane resin, organic amine is added to epoxy resin, peroxide such as methyl ethyl ketone peroxide, azoisobutyl nitrile, etc. The radical initiator is added to the unsaturated polyester resin. As a method of forming the surface protective layer with the thermosetting resin, for example, the above thermosetting resin is made into a solution, applied by a known coating method such as a roll coating method or a gravure coating method, dried and cured. Can be formed.

  The ionizing radiation curable resin is a resin that undergoes a cross-linking polymerization reaction upon irradiation with ionizing radiation and changes to a three-dimensional polymer structure. Ionizing radiation means an electromagnetic wave or charged particle beam having an energy quantum capable of polymerizing and crosslinking molecules, such as visible light, ultraviolet light (near ultraviolet light, vacuum ultraviolet light, etc.), X-ray, electron beam, ion beam, etc. is there. Usually, ultraviolet rays or electron beams are used. As the ultraviolet light source, a light source such as an ultra-high pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc lamp, a black light fluorescent lamp, or a metal halide lamp can be used. As the wavelength of the ultraviolet light, a wavelength range of 190 to 380 nm can be used. As the electron beam source, various electron beam accelerators such as a cockcroft-wald type, a bandegraft type, a resonant transformer type, an insulated core transformer type, a linear type, a dynamitron type, and a high frequency type can be used. The electron beam used is 100 to 1000 keV, preferably 100 to 300 keV. The irradiation amount of the electron beam is usually about 2 to 15 Mrad.

  As the ionizing radiation curable resin, a monomer having a radically polymerizable unsaturated group such as (meth) acryloyl group or (meth) acryloyloxy group or a cationically polymerizable functional group such as epoxy group in the molecule, It consists of a polymer or polymer. These monomers, prepolymers or polymers are used alone or in combination. In this specification, (meth) acrylate is used in the meaning of acrylate or methacrylate. The ionizing radiation means an electromagnetic wave or charged particle beam having an energy quantum capable of polymerizing or cross-linking molecules, and is usually an ultraviolet ray or an electron beam.

  Examples of the prepolymer having a radical polymerizable unsaturated group include polyester (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, melamine (meth) acrylate, triazine (meth) acrylate, and polyvinylpyrrolidone. This prepolymer usually has a molecular weight of about 10,000 or less. When the molecular weight exceeds 10,000, the cured resin layer has insufficient surface properties such as scratch resistance, abrasion resistance, chemical resistance, and heat resistance. The acrylate and methacrylate can be used in common, but the acrylate is more advantageous for the purpose of curing efficiently at a high speed and in a short time because the acrylate is faster in terms of the crosslinking curing rate with ionizing radiation. .

  Examples of the prepolymer having a cationically polymerizable functional group include epoxy resins such as bisphenol type epoxy resins, novolac type epoxy resins, and alicyclic epoxy resins, aliphatic vinyl ethers, aromatic vinyl ethers, urethane vinyl ethers, and ester vinyl ethers. And prepolymers such as vinyl ether resins, cyclic ether compounds, and spiro compounds.

  Examples of monomers having a radically polymerizable unsaturated group include (meth) acrylate compound monofunctional monomers such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, methoxyethyl ( (Meth) acrylate, methoxybutyl (meth) acrylate, butoxyethyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, N, N-dimethylaminomethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, N , N-diethylaminoethyl (meth) acrylate, N, N-diethylaminopropyl (meth) acrylate, N, N-dibenzylaminoethyl (meth) acrylate, lauryl (meth) acrylate, isobornyl (meth) acrylate, ethyl carbitol ( Me ) Acrylate, phenoxyethyl (meth) acrylate, phenoxypolyethylene glycol (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, methoxypropylene glycol (meth) acrylate, 2- (meth) acryloyloxyethyl-2-hydroxypropyl phthalate, 2 -(Meth) acryloyloxypropyl hydrogen terephthalate and the like.

  In addition, as a polyfunctional monomer having a radical polymerizable unsaturated group, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, di Propylene glycol (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, tri Propylene glycol di (meth) acrylate, bisphenol-A-di (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane ethylene oxide tri (meth) acrylate , Pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, glycerin polyethylene oxide tri (meth) acrylate, tris (meth) acryloyloxy Examples thereof include ethyl phosphate.

  As the monomer having a cationic polymerizable functional group, a prepolymer monomer having the cationic polymerizable functional group can be used.

  When the above-mentioned ionizing radiation curable resin is cured by irradiating with ultraviolet rays, a photopolymerization initiator is added as a sensitizer. In the case of a resin system having a radically polymerizable unsaturated group, photoinitiators include acetophenones, benzophenones, thioxanthones, benzoin, benzoin, benzoin methyl ether, Michler benzoylbenzoate, Michler ketone, diphenyl sulfide, dibenzyl disulfide , Diethyl oxide, triphenylbiimidazole, isopropyl-N, N-dimethylaminobenzoate and the like can be used alone or in combination. In the case of a resin system having a cationically polymerizable functional group, an aromatic diazonium salt, an aromatic sulfonium salt, a metallocene compound, a benzoin sulfonate ester, a freeloxyxonium diallyl iodosyl salt, etc., should be used alone or as a mixture. Can do. In addition, generally the addition amount of these photoinitiators is about 0.1-10 weight part with respect to 100 weight part of ionizing radiation curable resins.

  Next, the wood base adhesive layer 14 for laminating the moisture-proof decorative sheet 1 and the wood base 15 to be described later will be described. The wood-based base material adhesive layer 14 is a layer used for laminating the moisture-proof decorative sheet 1 and the wood-based base material 15, and as the adhesive that forms the wood-based base material adhesive layer 14, For example, any type of adhesive such as a thermoplastic resin system, a thermosetting resin system, and a rubber (elastomer) system 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. Rubber-based adhesives include natural rubber, recycled rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, butyl rubber, polysulfide rubber, silicone rubber, polyurethane rubber, stereo rubber (synthetic natural rubber), and ethylene propylene rubber. And block copolymer rubbers (SBS, SIS, SEBS, etc.). Further, for the purpose of concealing the surface color of the wooden substrate 15 and improving the design, the wooden substrate adhesive layer 14 may be colored with a pigment or the like.

  Further, examples of the woody base material 15 include woody base materials such as wood plywood, particle board, medium density fiber board (MDF), and high density fiber board (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.

[Example 1]
A 12 μm-thick biaxially stretched polyethylene terephthalate film (hereinafter referred to as a 12 μm-thick vapor-deposited PET film) in which an alumina vapor-deposited layer is formed on one surface and polyvinyl alcohol is coated and formed on the vapor-deposited layer surface On the side surface, a two-component curable adhesive comprising polyester polyol as a main component and isocyanate added as a curing agent was applied in a wet state at 3 to 4 g / scale ² and dried, and 30 g / m ² on the adhesive surface was dried. A laminate was produced by laminating paper-reinforced paper [Oji Specialty Paper Co., Ltd .: Uflex 30 (trade name)]. After performing corona discharge treatment on the PET surface of the laminate, a printing ink having a two-part curable resin mainly composed of nitrified cotton-based resin and isocyanate added as a curing agent on the corona discharge treatment surface is used. After printing and forming a solid pattern printing layer consisting of a solid pattern, and printing and printing a pattern printing layer consisting of a wood grain pattern using a printing ink with a nitrified cotton-based resin as a vehicle, the entire surface of the printing layer Then, a two-component curable resin in which an isocyanate was added as a curing agent to an acrylic polyol-based resin as a main agent was applied by a gravure printing method to produce a moisture-proof decorative sheet in which a transparent surface protective layer was formed. Next, 7-8 g / scale ^{2 of} vinyl acetate adhesive is applied in a wet state to a 3 mm-thick medium density fiberboard (MDF), and after drying, the moisture-proof decorative sheet is applied to the coated surface with a surface protective layer. The laminate of the present invention was produced by laminating with a roll laminator as shown.

[Comparative Example 1]
23 g / m ² inter-paper reinforced paper (Oji Special Paper Co., Ltd .: Fix23 (trade name)) and 30 g / m ² inter-paper reinforced paper [Oji Special Paper ( U-Flex 30 (trade name)] is sandwich-laminated with a 40 μm-thick polyethylene resin so that the corona discharge-treated surfaces face each other, and inter-paper reinforced paper (23 g / m ² ) / polyethylene (40 μm ) / Paper reinforced paper (30 g / m ² ) printed substrate. Next, using a printing ink having a vehicle made of a two-part curable resin mainly composed of nitrified cotton-based resin and added with isocyanate as a curing agent on the inter-paper reinforced paper (30 g / m ² ) surface of the printing substrate, After printing and forming a solid pattern printing layer consisting of a solid pattern, and printing and printing a pattern printing layer consisting of a wood grain pattern using a printing ink with a nitrified cotton-based resin as a vehicle, the entire surface of the printing layer Then, a moisture-proof decorative sheet was prepared as a comparative example in which a two-part curable resin in which isocyanate was added as a curing agent to an acrylic polyol resin as a main agent was applied by a gravure printing method to form a transparent surface protective layer. Next, 7-8 g / scale ^{2 of} vinyl acetate adhesive is applied in a wet state to a 3 mm-thick medium density fiberboard (MDF), and after drying, the moisture-proof decorative sheet is applied to the coated surface with a surface protective layer. A decorative board as a comparative example was produced by laminating with a roll laminator as shown.

  About the moisture-proof decorative sheet and decorative plate of Example 1 and Comparative Example 1 prepared above, the moisture permeability, plane tensile strength, and surface design (tone reproducibility) were evaluated by the following evaluation methods, and the results are shown. It is summarized in 1.

〔Evaluation method〕
Moisture permeability:
The moisture permeability was calculated by measuring the moisture-proof decorative 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)”.
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 decorative board used for the evaluation was obtained by cold pressing the decorative board prepared above for 24 hours, cutting the decorative board into 5 cm square, and attaching a metal jig with a 2 cm square base to the moisture-proof sheet surface. After pasting with an agent and curing at room temperature (about 23 ° C) for 24 hours,
Using a cutter knife, make a notch that reaches the MDF along the metal jig, pull it in the direction perpendicular to the test piece with the measuring test equipment, and visually observe and evaluate the peeled interface at that time, and evaluate the tensile strength. It was measured.
The unit of measurement is N / cm ² .
Surface design (tone reproducibility)
In the visual evaluation, those with good tone reproducibility were indicated as “good” by ○, and those with poor ink depositability and inferior tone reproducibility were indicated as “poor” by evaluation.

As is clear from Table 1, the moisture-proof decorative sheet and decorative plate used in the decorative plate of the present invention are provided with an alumina vapor-deposited layer, so that the moisture permeability performance is improved and the makeup generated by changes in environmental temperature and humidity. Not only can the effect of preventing warping of the plate be expected, but also the adhesive strength between the moisture-proof decorative sheet and the MDF can be improved, and used in a place where there is a large difference in the temperature and humidity environment on both sides In addition, when used for a long period of time or when an external force is applied forcefully, an excellent effect of preventing warping and preventing the moisture-proof decorative sheet from peeling or floating can be expected. Furthermore, by replacing the printing base material with the base layer made of synthetic resin from the paper layer, ink inking property is improved, printing reproducibility (tone reproducibility) is good, and design is to be excellent. it can.

DESCRIPTION OF SYMBOLS 1 Moisture-proof decorative sheet 2 Decorative plate 8 Surface protective layer 9 Printing layer 10 Synthetic resin base material layer 11 Vapor deposition layer 12 Adhesive layer 13 Paper layer 14 Woody base material adhesive layer 15 Woody base material S Printing base material

Claims (2)

A printing layer and a surface protective layer are sequentially laminated on the other surface of the synthetic resin substrate layer of the printing substrate in which the vapor deposition layer is laminated on one surface side of the synthetic resin substrate layer, and the vapor deposition layer A moisture-proof decorative sheet, wherein a paper layer is laminated on the side surface through an adhesive layer. The decorative board according to claim 1, wherein the moisture-proof decorative sheet according to claim 1 is laminated on one surface of the wooden base material so that the surface protective layer is exposed through an adhesive layer for the wooden base material. .

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