JP2017080907A - Moistureproof decorative laminate and fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moistureproof decorative laminate and a fitting, with improved adhesiveness between a woody base material and a moistureproof sheet.SOLUTION: A moistureproof decorative laminate includes: a woody base material 2; a decorative sheet 4 arranged at one side 2a of the woody base material 2; and a moistureproof sheet 6 arranged at the other side 2b of the woody base material 2. One side (a side on the woody base material) 6a of the moistureproof sheet 6 has a second adhesive primer layer 15. A second adhesion layer 5 adhering the woody base material 2 and the moistureproof sheet 6 includes ethylene vinyl acetate copolymer resin.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a moisture-proof decorative board and a fitting, for example, a moisture-proof decorative board used for a fitting such as an indoor door, a kitchen door, a storage door, or a bag, and a fitting including the moisture-proof decorative board.

  For decorative panels such as indoor door panels, to prevent warping of the base material due to moisture absorption and release due to changes in temperature and humidity in the indoor atmosphere, the surface of the wooden base material that constitutes the decorative board is used. A moisture-proof sheet may be attached. In other words, the decorative board is intended to improve the solid printing layer and design for providing concealability to the surface of plywood, medium density fiber board (MDF), veneer board, board material, and other multi-layer woody base materials. It is composed by pasting together a decorative sheet printed with a pattern-like layer. And in these decorative boards, in order to prevent the deformation | transformation (warpage and dimensional change) by temperature and humidity, the method of applying a coating material on the back surface of a wooden base material, or bonding a moisture-proof sheet is known. . In addition, there exists what was disclosed by patent document 1 as a moisture-proof sheet.

Japanese Patent No. 4946350

In some cases, sufficient adhesiveness cannot be expected by simply applying an adhesive between the wooden substrate and the moisture-proof sheet. In particular, when the decorative board is placed for a long time in an environment where the temperature and humidity change are large, it is difficult to sufficiently maintain the adhesiveness between the wooden substrate and the moisture-proof sheet.
Then, this invention is made | formed in view of such a situation, and it aims at providing the moisture-proof decorative board and fitting which improved the adhesiveness of a wooden base material and a moisture-proof sheet | seat.

In order to solve the above-described problems, a moisture-proof decorative board according to one aspect of the present invention includes a wooden base material, a decorative sheet provided on one surface side of the wooden base material, and the other surface of the wooden base material. A moisture-proof sheet provided on the side, an adhesive primer layer is provided on the surface of the moisture-proof sheet on the side of the wooden substrate, and an adhesive layer that bonds the wooden substrate and the moisture-proof sheet is And ethylene-vinyl acetate copolymer resin.
A fitting according to another aspect of the present invention includes the moisture-proof decorative board and a core material, and the moisture-proof decorative board is attached to at least one surface side of the core material. To do.

  According to one embodiment of the present invention, it is possible to provide a moisture-proof decorative board and joinery that have improved adhesion between the wooden substrate and the moisture-proof sheet.

It is sectional drawing which shows the structural example of the moisture-proof decorative board 1 which concerns on embodiment of this invention. It is sectional drawing which shows the structural example of the moistureproof sheet 6 which concerns on embodiment of this invention. It is sectional drawing which shows the structural example of the fitting 10 which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings described below, parts corresponding to each other are denoted by the same reference numerals, and repeated description of the same reference numerals will be omitted as appropriate. Further, the embodiment of the present invention exemplifies a configuration for embodying the technical idea of the present invention, and specifies the material, shape, structure, arrangement, dimensions, etc. of each part as follows. Not. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

<Dampproof decorative board>
FIG. 1 is a cross-sectional view showing a configuration example of a moisture-proof decorative board 1 according to an embodiment of the present invention. As shown in FIG. 1, the moisture-proof decorative board 1 is provided on a wooden base material 2, a decorative sheet 4 provided on one surface 2 a side of the wooden base material 2, and the other surface 2 b side of the wooden base material 2. A moisture-proof sheet 6. When one surface 2a of the wooden substrate 2 is the front surface, the other surface 2b of the wooden substrate 2 is the back surface.
An adhesive primer layer (second adhesive primer layer) 15 is provided on the surface of the moisture-proof sheet 6 on the wooden substrate 2 side. Further, an adhesive layer (second adhesive layer) 5 is provided between the wooden substrate 2 and the moisture-proof sheet 6. The wood substrate 2 and the moisture-proof sheet 6 are bonded to each other by the second adhesive layer 5. The second adhesive layer 5 includes an ethylene / vinyl acetate copolymer resin (EVA).

(1) Wood base material The wood base material 2 is a plywood, a particle board, a medium density fiber board (MDF), or a hard board, for example. The thickness of the wooden substrate 2 is, for example, 1 mm or more and 50 mm or less.

(2) Decorative sheet The decorative sheet 4 is a resin-based decorative sheet including a resin layer. Examples of the resin layer included in the decorative sheet 4 include polypropylene, polyethylene, polyester, and polyvinyl chloride. Examples of the resin layer included in the decorative sheet 4 include a resin base material or a resin-based surface protective layer, as shown in a specific example described later.
From the viewpoint of design properties, the thickness of the decorative sheet 4 is preferably 0.05 mm or more and 0.30 mm or less. Further, from the viewpoint of reducing heat generation, the decorative sheet 4 is preferably polyester, polyvinyl chloride, or the like, or a composite decorative sheet of these and other resins.

(2.1) Specific Example To give a specific example, the decorative sheet 4 includes a resin base material, a pattern layer (that is, a printing layer) formed on the resin base material, and a pattern formed on the resin base material. And a surface protective layer (ie, an overlay film layer) covering the layer. The thickness of the resin base material is preferably about 20 μm to 300 μm, more preferably about 50 μm to 200 μm, although it depends on the use of the decorative sheet 4 and the type of resin. Examples of the base material molding method include an extrusion molding method, an inflation molding method, a calendar molding method, and a cast molding method.

In this embodiment, a paper base material may be used instead of the resin base material. As the paper substrate, 20-50 g / m ² thin paper, inter-paper reinforced paper, single gloss craft, and pure white roll can be used.
As the resin binder of the ink for forming the pattern layer, cellulose derivatives such as nitrocellulose (including those with a part of the 0H group of cellulose), polyvinyl alcohol, polyvinyl butyral, and those obtained by mixing isocyanate compounds with them Acrylic acid amide-acrylic acid ester copolymer and vinyl chloride-vinyl acetate copolymer can be used.

There is no restriction | limiting in particular in the formation method of a pattern layer, For example, various printing methods, such as a gravure printing method, an offset printing method, a screen printing method, a flexographic printing method, an electrostatic printing method, an ink jet printing method, can be used. In addition, for example, in the case of a solid surface, in addition to the above-described various printing methods, for example, roll coating method, knife coating method, air knife coating method, die coating method, lip coating method, comma coating method, kiss coating method, flow coating method Various coating methods such as a dip coating method can also be used. In addition, for example, the hand-drawn method, the ink-washing method, the photographic method, the laser beam or electron beam drawing method, the partial vapor deposition method of metal or the like, the etching method, or a combination of these methods may be used.
There is no particular limitation on the type of pattern shown by the pattern layer, and it may be, for example, a wood grain pattern, a stone pattern, a cloth pattern, an abstract pattern, a geometric pattern, or a single color for the purpose of simple coloring or color adjustment. It may be plain. Any desired picture can be adopted according to the use of the decorative sheet 4.

As a surface protective layer, a polyester prepolymer having a hydroxyl group (—OH), an acrylic type, a polyether type, a partially saponified product of an ethylene-vinyl acetate copolymer, and an isocyanate compound are mixed and crosslinked and cured. Can be used. The thickness of the surface protective layer is preferably about 10 μm to 200 μm, and more preferably in the range of about 10 μm to 100 μm. Examples of the method for forming the surface protective layer include an extrusion molding method, an inflation molding method, a calendar molding method, and a cast molding method.
In addition, the surface protective layer needs to have transparency to such an extent that the picture layer below it can be seen through. For this reason, the surface protective layer is particularly preferably colorless and transparent, but may be colored and transparent or translucent. Transparent refers to the degree of transparency that allows the back to be seen from the front. As long as it has transparency, the surface protective layer may contain a colorant and a filler.

(2.2) Weather-resistant prescription In this embodiment, as a weather-resistant prescription, a weather-resistant prescription additive (benzotriazole-based UV absorber, benzophenone-based UV absorber, triazine-based UV absorber, hindered amine) System light stabilizers, hindered phenol antioxidants, etc.) may be added as appropriate. These various additives may be used singly or in combination.
Examples of triazines include 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy] -phenol, 2- [4-[(2-hydroxy-3 -Dodecyloxypropyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, 2- [4-[(2-hydroxy-3-tri Decyloxypropyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4dimethylphenyl) -1,3,5-triazine, 2,4-bis (2,4-dimethylphenyl) -6 (2-Hydroxy-4-iso-octyloxyphenyl) -s-triazine and the like, mixtures, modified products, polymers and derivatives thereof can be used. Furthermore, as the benzophenone series, octabenzone, modified products thereof, polymers and derivatives can be used.

  By adding a hindered amine light stabilizer, deterioration of the resin itself by light, heat, water, etc. can be prevented. The added part of the hindered amine light stabilizer may be added according to the desired weather resistance, but is 0.1% to 10%, preferably 1% to 5% with respect to the resin solid content. As a hindered amine light stabilizer, bis (1,2,2,6,6-pentamethyl-4-piperidyl) [[3,5-bis (1,1-dimethylethyl) -4-hydroxyphenyl] methyl] Butyl malonate, bis (1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, methyl (1,2,2,6,6-pentamethyl-4-popperidinyl) sebacate, bis (2) decanedioate , 2,6,6-tetramethyl-1 (octyloxy) -4-piperidinyl) ester, mixtures thereof, modified products, polymers, derivatives, and the like.

(2.3) Heat-shielding prescription In this embodiment, as a heat-shielding prescription, the resin base material may contain a pigment for increasing the reflectance of infrared light in the resin base material. As the pigment to be contained in the resin substrate, at least one of isoindolinone, disazo, polyazo, diketopyrrolopyrrole, quinacridone, phthalocyanine, and titanium oxide is used.
For example, heat shielding properties can be improved by containing 23 parts by mass or more of titanium oxide in the resin base material. Or you may apply | coat titanium oxide to the surface in which a pattern layer is formed among resin base materials, and may provide a titanium oxide layer. When providing the titanium oxide layer, the total of the titanium oxide content in the titanium oxide layer and the titanium oxide content in the resin base material is 23 parts by mass or more with respect to the entire titanium oxide layer and the resin base material. If it is.
In addition, when the titanium oxide added to the resin base material increases, the titanium oxide affects the film quality of the resin base material. For this reason, suitable content of the titanium oxide in a resin base material is 23 to 50 mass parts.

(2.4) Designable Prescription In the present embodiment, as a designable prescription, a pattern made of unevenness may be provided on the surface of the decorative sheet 4 (for example, the surface of the surface protective layer). A pattern formed by embossing (that is, an embossed pattern) is an example of the pattern made of unevenness. There is no particular limitation on the type of embossed pattern, and it may be various patterns such as wood grain (particularly conduit pattern), stone pattern, cloth pattern, Japanese paper pattern, geometric pattern, etc. It may be matte, grainy, hairlined, suede or the like.

In addition, it is possible to further improve the design by synchronizing these embossed patterns with the pattern layer, but if it is not necessary, it may be non-synchronized and not synchronized with the pattern synchronized with the pattern layer. Embossing including both the pattern and the pattern can be provided.
Although there is no restriction | limiting in particular also in the formation method of an embossing pattern, The mechanical embossing method using a metal embossing plate is common. There is no particular limitation on the formation time of the embossed pattern, and any time may be selected from before the surface protective layer is laminated on the substrate, simultaneously with the lamination or after the lamination. Moreover, you may form the same or different embossed pattern in multiple times chosen from each time in multiple times.

(3) Moisture-Proof Sheet FIG. 2 is a cross-sectional view showing a configuration example of the moisture-proof sheet 6. As shown in FIG. 2, the moisture-proof sheet 6 is provided on a resin base layer 11, a vapor deposition layer 12 made of an inorganic oxide provided on one surface side of the base material layer 11, and the vapor deposition layer 12. A first adhesive primer layer 14 provided on the resin layer 13, and a second adhesive primer layer 15 provided on the other surface side of the base material layer 11. . The other surface of the base material layer 11 is a surface (one surface) 6 a on the wooden base material side of the moisture-proof sheet 6.

The moisture-proof sheet 6 has transparency that allows the other surface 6b side to be seen through from the one surface 6a side. The moisture-proof sheet 6 may be colorless and transparent, or may be colored and transparent. Transparent refers to the degree of transparency that allows the back to be seen from the front. The water vapor permeability of the entire moisture-proof sheet 6 is 1.0 g / m ² · day or less. Moreover, it is preferable that the oxygen permeability of the whole moisture-proof sheet 6 is 1.0 g / m ² · day or less.
The moisture-proof sheet 6 may be thermoplastic. That is, the moisture-proof sheet 6 may be a thermoplastic resin-based moisture-proof sheet. Next, each layer shown in FIG. 2 will be described more specifically.

(3.1) Base material layer The base material layer 11 is made of a synthetic resin. Examples of the material of the base material layer 11 include olefinic thermoplastic resins such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl alcohol copolymer, or a mixture thereof, polyethylene terephthalate (PET), poly Ester-based thermoplastic resins such as butylene terephthalate, polyethylene naphthalate, polyethylene naphthalate-isophthalate copolymer, polycarbonate, polyarylate, acrylic heat such as polymethyl methacrylate, polymethyl methacrylate ethyl, polybutyl acrylate Non-halogen thermoplastic resins such as a plastic resin, polyimide, polyurethane, polystyrene, acrylonitrile-butadiene-styrene resin, and the like can be given.

The base material layer 11 is a base material on which a vapor deposition layer 12 described later is provided on one surface, and is a biaxially stretched resin sheet for reasons such as high mechanical strength and excellent dimensional stability. It is preferable (however, in this embodiment, the base material layer 11 is not limited to biaxial stretching, and may be unstretched). For example, the base material layer 11 is made of biaxially stretched PET or unstretched PET. The thickness of the base material layer 11 is, for example, in the range of 9 to 100 μm. The base material layer 11 is colorless and transparent or colored and transparent.
In addition, the other surface (for example, back surface) of the base material layer 11 may be provided with a surface wettability modified portion (not shown) whose surface wettability is modified. The surface wettability modified portion is formed by, for example, a physical surface modification process such as a reactive etching process (that is, reactive ion etching (RIE) process) or a corona discharge process. The surface becomes rough at the nano level by physical treatment such as reactive etching treatment or corona discharge treatment, and the surface wettability is modified.

(3.2) Vapor deposition layer The vapor deposition layer 12 consists of thin films of inorganic oxides, such as silicon oxide, magnesium oxide, or aluminum oxide. Here, a metal thin film typified by aluminum has a metallic luster, but an inorganic oxide thin film becomes a transparent deposited film.
The optimum condition for the thickness of the vapor-deposited layer 12 varies depending on the type and configuration of the inorganic oxide used, but generally it is preferably in the range of 5 to 300 nm, and the value is appropriately selected. However, if the film thickness of the inorganic oxide is less than 5 nm, a uniform film may not be obtained or the film thickness may not be sufficient, and the function as a moisture-proof sheet may not be sufficiently achieved. Further, when the film thickness of the inorganic oxide exceeds 300 nm, the flexibility cannot be maintained due to the residual stress of the thin film, and the thin film may be cracked due to external factors after the film formation. For this reason, the thickness of the vapor deposition layer 12 is more preferably in the range of 10 to 150 nm.

  As a method of laminating the vapor deposition layer 12 on the base material layer 11, a vacuum vapor deposition method, a sputtering method, an ion plating method, a plasma vapor deposition method (CVD), or the like can be used. However, in consideration of productivity, the vacuum deposition method is the best. As the heating means of the vacuum evaporation method, it is preferable to use any one of an electron beam heating method, a resistance heating method, and an induction heating method. It is more preferable to use the method. Further, in order to improve the adhesion between the vapor deposition layer 12 and the base material layer 11 and the denseness of the vapor deposition layer 12, the vapor deposition layer 12 can be vapor-deposited by using a plasma assist method or an ion beam assist method. . Moreover, in order to improve the transparency of the vapor deposition layer 12, you may use the reactive vapor deposition which blows in various gases, such as oxygen, in the case of vapor deposition.

(3.3) Resin layer The resin layer 13 contains polyvinyl alcohol as a main component. The main component is a component that occupies a high ratio in the whole substance. For example, when the whole is 100 parts by mass, the main component is 70 parts by mass or more. The resin layer 13 may be a composition containing an inorganic oxide in polyvinyl alcohol. The resin layer 13 is provided to protect the vapor deposition layer 12 and improve the gas barrier property of the vapor deposition layer 12.
The resin layer 13 is applied on the vapor deposition layer 12 by, for example, polyvinyl alcohol or a composition obtained by adding an inorganic oxide such as silicon oxide, magnesium oxide, or aluminum oxide to polyvinyl alcohol by a roll coating method or a gravure coating method. Is formed. The resin layer 13 is colorless and transparent or colored and transparent.

(3.4) First and Second Adhesive Primer Layer The adhesion primer layer 14 is provided to improve adhesion with a core material to be described later. The second adhesion primer layer 15 is provided to improve the adhesion with the wood substrate 2. Specifically, the first and second adhesion primer layers 14 and 15 are ester resin, urethane resin, acrylic resin, urethane acrylic resin (urethane acrylate), polycarbonate resin, vinyl chloride-vinyl acetate copolymer, polyvinyl. A butyral resin, a nitrocellulose resin, etc. can be mentioned, Among these, a urethane type acrylic resin (urethane acrylate) can be mentioned as a particularly preferable example. The first and second adhesion primer layers 14 and 15 can be formed by using an appropriate coating means such as a roll coating method or a gravure printing method by using these resins alone or mixed to form an adhesive composition. .

  The primers constituting the first and second adhesion primer layers 14 and 15 are particularly preferably formed of a resin comprising a copolymer of acrylic resin and urethane resin and isocyanate. That is, a copolymer of an acrylic resin and a urethane resin includes an acrylic polymer component having a hydroxyl group at the terminal (component A), a polyester polyol component having a hydroxyl group at both ends (component B), and a diisocyanate component (component C). To obtain a prepolymer, and a chain extender (component D) such as diamine is further added to the prepolymer to extend the chain. By this reaction, polyester urethane is formed and an acrylic polymer component is introduced into the molecule to form an acrylic-polyester urethane copolymer having a hydroxyl group at the terminal. Primers constituting the first and second adhesion primer layers 14 and 15 are formed by reacting and curing the hydroxyl groups at the ends of the acrylic-polyester urethane copolymer with isocyanate.

  As the component A, a linear acrylate polymer having a hydroxyl group at the terminal is used. Specifically, linear polymethyl methacrylate (PMMA) having a hydroxyl group at the terminal is preferable because it is excellent in weather resistance (particularly the property against photodegradation) and can be easily copolymerized with urethane. . Component A is an acrylic resin component in the copolymer, and those having a molecular weight of 5000 to 7000 (weight average molecular weight) are preferably used because of particularly good weather resistance and adhesiveness. In addition, component A may be used only having hydroxyl groups at both ends, or a component having a conjugated double bond remaining at one end may be mixed with one having hydroxyl groups at both ends. Good.

  Component B reacts with diisocyanate to form polyester urethane and constitutes a urethane resin component in the copolymer. Component B is a polyester diol having hydroxyl groups at both ends. Examples of the polyester diol include an addition reaction product of a diol compound having an aromatic or spiro ring skeleton and a lactone compound or a derivative thereof, or an epoxy compound, a condensation product of a dibasic acid and a diol, and a cyclic ester compound. Examples thereof include a derived polyester compound. Examples of the diol include short-chain diols such as ethylene glycol, propylene glycol, diethylene glycol, butanediol, hexanediol, and methylpentenediol, and alicyclic short-chain diols such as 1,4-cyclohexanedimethanol. . Examples of the basic acid include adipic acid, phthalic acid, isophthalic acid, terephthalic acid and the like. The polyester polyol is preferably adipic acid or a mixture of adipic acid and terephthalic acid as an acid component, particularly preferably adipic acid, and an adipate system using 3-methylpentenediol and 1,4-cyclohexanedimethanol as diol components. Polyester.

  The urethane resin component formed by the reaction of the component B and the component C gives flexibility to the first and second adhesion primer layers 14 and 15 and contributes to improvement in adhesion. The acrylic resin component made of an acrylic polymer contributes to the weather resistance and blocking resistance of the first and second adhesion primer layers 14 and 15. In the urethane resin, the molecular weight of the component B may be within a range in which a urethane resin capable of sufficiently exhibiting flexibility in the first and second adhesion primer layers 14 and 15 is obtained, and adipic acid or adipic acid In the case of a polyester diol composed of a mixture of terephthalic acid and 3-methylpentanediol and 1,4-cyclohexanedimethanol, 500 to 5000 (weight average molecular weight) is preferable.

  Component C is an aliphatic or alicyclic diisocyanate compound having two isocyanate groups in one molecule. Examples of the diisocyanate include tetramethylene diisocyanate, 2,2,4 (2,4,4) -1,6-hexamethylene diisocyanate, isophorone diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, and 1,4′-cyclohexyl. A diisocyanate etc. can be mentioned. As the diisocyanate component, isophorone diisocyanate is preferable in terms of excellent physical properties and cost. When the components A to C are reacted, the equivalent ratio of the total hydroxyl group (which may be an amino group) of the acrylic polymer, polyester polyol and chain extender described below and the isocyanate group is such that the isocyanate group becomes excessive. .

  When the three components A, B, and C are reacted at 60 to 120 ° C. for about 2 to 10 hours, the isocyanate group of the diisocyanate reacts with the hydroxyl group at the end of the polyester polyol to form a polyester urethane resin component and at the end of the acrylic polymer. A compound in which a diisocyanate is added to a hydroxyl group is also mixed to form a prepolymer in which an excess of isocyanate groups and hydroxyl groups remain. As a chain extender to this prepolymer, for example, diamines such as isophorone diamine and hexamethylene diamine are added, the isocyanate group is reacted with the chain extender, and the chain is extended to introduce the acrylic polymer component into the polyester urethane molecule. Thus, an acrylic-polyester urethane copolymer (I) having a hydroxyl group at the terminal can be obtained.

Addition of isocyanate to acrylic-polyester urethane copolymer, coating method, coating solution adjusted to necessary viscosity in consideration of coating amount after drying, known coating methods such as gravure coating method, roll coating method, etc. The first and second adhesion primer layers 14 and 15 may be formed by applying the above. The isocyanate is not particularly limited as long as it can react with the hydroxyl group of the acrylic-polyester urethane copolymer and can be crosslinked and cured. For example, divalent or higher aliphatic or aromatic isocyanates can be used. Aliphatic isocyanates are desirable from the viewpoint of discoloration prevention and weather resistance. Specifically, a monomer such as tolylene diisocyanate, xylylene diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, lysine diisocyanate, or a multimer such as a dimer or trimer thereof, or And polyisocyanates such as derivatives (adducts) obtained by adding these isocyanates to polyols.
The first, respectively the coating amount after drying of the second adhesive primer layer 14 and 15, a from 1 to 20 g / ^{m 2,} preferably from 1 to 5 g / ^{m 2.} Further, the first and second adhesion primer layers 14 and 15 may each 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.

(4) First Adhesive Layer As shown in FIG. 1, a first adhesive layer 3 is provided between the wooden substrate 2 and the decorative sheet 4. The wood substrate 2 and the decorative sheet 4 are bonded by the first adhesive layer 3. The first adhesive layer 3 includes any type of adhesive such as a thermoplastic resin system, a thermosetting resin system, and a rubber (elastomer) system. These can be used by appropriately selecting known products or commercially available products. 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 resin, 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), ethylene propylene rubber, block Examples include copolymer rubber (SBS, SIS, SEBS, etc.).
The first adhesive layer 3 may contain the same type of resin as the second adhesive layer 5. That is, the first adhesive layer 3 is an ethylene / vinyl acetate copolymer resin adhesive layer, and may have an ethylene / vinyl acetate copolymer resin as a main component. For example, when the first adhesive layer 3 and the second adhesive layer 5 are made of the same type of resin, the adhesive used for forming both layers can be made common, so that the manufacturing cost of the moisture-proof decorative board 1 can be reduced. There is a possibility that it can contribute to.

(5) Second Adhesive Layer A second adhesive layer 5 is provided between the wooden substrate 2 and the moisture-proof sheet 6. The wood substrate 2 and the moisture-proof sheet 6 are bonded to each other by the second adhesive layer 5. The second adhesive layer 5 includes an ethylene / vinyl acetate copolymer resin. That is, the second adhesive layer 5 is an ethylene / vinyl acetate copolymer resin adhesive layer, and has an ethylene / vinyl acetate copolymer resin as a main component. Here, the main component is a component that occupies a high ratio in the whole substance. For example, when the whole is 100 parts by mass, the main component is 70 parts by mass or more.

<Furniture>
FIG. 3 is a cross-sectional view illustrating a configuration example of the joinery 10 according to the embodiment of the present invention. As shown in FIG. 3, the joinery 10 includes the moisture-proof decorative board 1 and the core material 9 described above. And the moisture-proof sheet 6 side of the moisture-proof decorative board 1 is stuck on at least one surface side of the core material 9. For example, the moisture-proof decorative board 1 is affixed to one surface 20a and the other surface 20b of the core material 9, respectively. A first adhesion primer layer 14 (see FIG. 2) is provided on the surface of the moisture-proof decorative board 1 facing the core material 9. The moisture-proof decorative board 1 is affixed to the core material 9 via an adhesive (not shown) with the first adhesion primer layer 14 facing the core material 9. This joinery 10 can be used for, for example, an indoor door, a kitchen door, a storage door, or a basket.

<Effect of embodiment>
According to the embodiment of the present invention, one surface of the moisture-proof decorative board 1 is covered with the decorative sheet 4. Thereby, the movement of the water | moisture content between the external world and the wooden base material 2 can be suppressed. Further, the other surface of the moisture-proof decorative board 1 is covered with a moisture-proof sheet 6. Thereby, the movement of the water | moisture content between the core material 9 and the wooden base material 2 can be suppressed. For this reason, the wooden base material 2 can suppress moisture absorption / release from the front and back sides, and can suppress expansion or contraction associated with moisture absorption / release.

Further, a second adhesive primer layer 15 is provided on the surface (one surface) 6 a of the moisture-proof sheet 6 on the side of the wooden base material. An ethylene / vinyl acetate copolymer resin adhesive layer is provided as the second adhesive layer 5 between the one surface 6 a and the wood substrate 2. Thereby, the adhesiveness of the wooden base material 2 and the moisture-proof sheet 6 can be improved. For example, even when the moisture-proof decorative board 1 is placed in an environment where changes in temperature and humidity are large, the wooden base material 2 and the moisture-proof sheet 6 are protected. High adhesion to the sheet 6 can be maintained.
From the above, according to the present embodiment, it is possible to further prevent the moisture-proof decorative board from being deformed (warped or dimensional change) due to temperature or humidity, as compared with the conventional technique.

Next, the present invention will be described in more detail with reference to the following examples.
<Example>
First, the moisture-proof sheet 6 was produced. Here, a transparent biaxially stretched polyethylene terephthalate (PET) film having a thickness of 12 μm was used as the base material layer 11. The vapor deposition layer 12 was provided on one surface (for example, the surface) of the base material layer 11. The vapor deposition layer 12 was formed so that aluminum oxide had a thickness of 150 nm. A vacuum vapor deposition method was used as a method for forming the vapor deposition layer 12, and an electron beam heating method was used as a heating means for the vacuum vapor deposition method. At that time, a plasma assist method was used in order to improve the adhesion between the vapor deposition layer 12 and the base material layer 11, and oxygen gas was blown in order to improve the transparency of the vapor deposition layer 12 to perform reactive vapor deposition. Thus, the moisture-proof sheet 6 for building materials having a water-vapor permeability of the moisture-proof sheet of 1.0 g / m ² · day or less and having transparency that allows the back side of the moisture-proof sheet to be seen through is created. It becomes possible.

Next, the polyvinyl alcohol solution was applied onto the vapor deposition layer 12 by a gravure printing method so as to be 0.5 g / m ² after drying, thereby providing a resin layer 13. Moreover, the other surface (for example, back surface) of the base material layer 11 was subjected to corona discharge treatment as an adhesion assisting treatment.
Next, a two-component curable resin prepared by adding a urethane resin / vinyl chloride resin as a main agent and an isocyanate as a curing agent was prepared. The two-component curable resin is formed to a thickness of 1 g / m ^{2 in} solid content by gravure printing on the surface of the resin layer 13 and the other surface of the base material layer 11 subjected to the corona discharge treatment. It applied and provided the 1st, 2nd primer layers 14 and 15 for adhesion. Thus, the moisture-proof sheet 6 was obtained.

Moreover, the decorative sheet 4 was produced. Here, a pattern layer is printed on the surface of a paper-reinforced paper having a basis weight of 30 g / m ² (manufactured by Tenma Special Paper Co., Ltd.) with nitrocellulose-based ink (manufactured by Toyo Ink Co., Ltd.). On the layer, an acrylic urethane resin (two-component curing type, manufactured by Toyo Ink Manufacturing Co., Ltd.) was applied in a solid content to a thickness of 6 g / m ² to form a resin-based surface protective layer. Thus, the decorative sheet 4 was obtained.
Next, the moisture-proof decorative board 1 was prepared by pasting the moisture-proof sheet 6 and the decorative sheet 4 produced by the above-described method on both surfaces of the wooden substrate 2. Here, the moisture-proof sheet 6 and the decorative sheet 4 produced by the method described above, the medium density fiberboard (MDF) 6 mm thick as the wooden base material 2, and the materials of the first and second adhesive layers 3 and 5 An ethylene / vinyl acetate copolymer resin emulsion adhesive was prepared. An ethylene / vinyl acetate copolymer resin emulsion adhesive was applied to one surface of the MDF, and the back surface of the inter-sheet reinforced paper of the decorative sheet 4 was bonded thereto. Further, an ethylene / vinyl acetate copolymer resin emulsion adhesive was applied to the other surface of the MFD, and the one surface 6a of the moisture-proof sheet 6 was bonded thereon. The moisture-proof decorative board 1 was obtained by the above.

  Then, the moisture-proof decorative board 1 produced by said method was affixed on both surfaces of the core material 9, and the fitting 10 was produced. Here, the two moisture-proof decorative boards 1 produced by said method, the wooden core material 9, and the vinyl acetate emulsion adhesive were prepared. A vinyl acetate emulsion adhesive was applied to one surface (for example, the surface) of the core material 9, and the first moisture-proof decorative board 1 was bonded thereto. Moreover, the vinyl acetate emulsion adhesive agent was apply | coated to the other surface (for example, back surface) of the core material 9, and the 2nd moisture-proof decorative board 1 was bonded together from the top. Thus, joinery 10 was obtained. This fitting 10 can be suitably used for, for example, an indoor door, a kitchen door, a storage door, or a basket.

<Comparative Example 1>
In Comparative Example 1, the second adhesion primer layer was not formed on one surface side of the moisture-proof sheet. That is, the second adhesion primer layer was not formed on the back surface of the base material layer. Except for this, a moisture-proof sheet was obtained in the same manner as in Example 1.
In Comparative Example 1, a decorative sheet was obtained in the same manner as in Example 1.
Thereafter, an ethylene / vinyl acetate copolymer resin emulsion adhesive was applied to one side of the MDF, and the back side of the inter-sheet reinforced paper of the decorative sheet was bonded thereto. Further, an ethylene / vinyl acetate copolymer resin emulsion adhesive was applied to the other surface of the MDF, and one surface of the moisture-proof sheet (that is, the back surface of the base material layer) was bonded thereto. Thus, a moisture-proof decorative board was obtained.

<Comparative example 2>
In Comparative Example 2, a moisture-proof sheet and a decorative sheet were obtained in the same manner as in Example 1.
Then, the vinyl acetate emulsion adhesive was apply | coated to one side of MDF, and the back surface of the paper reinforcement | strengthening paper of a decorative sheet was bonded together on it. Moreover, the vinyl acetate emulsion adhesive agent was apply | coated to the other surface of MDF, and the back surface of the base material layer of a moisture-proof sheet was bonded together on it. That is, in Comparative Example 2, no ethylene / vinyl acetate copolymer resin emulsion adhesive was used. Thus, a moisture-proof decorative board was obtained.

<Evaluation>
About the moisture-proof decorative board 1 which concerns on Example 1 produced above, and the moisture-proof decorative board which concerns on Comparative Examples 1 and 2, the adhesiveness of a wooden base material and a moisture-proof sheet was evaluated. The adhesive evaluation method and the results are as follows.

(1) Evaluation method Plane tensile strength: JAS plywood Plane tensile strength was measured according to a plane tensile test. The unit of plane tensile strength is N / cm ² .
The moisture-proof decorative board used for the evaluation was a cold-pressed sheet of moisture-proof sheet and MDF for 24 hours. The moisture-proof decorative board was cut into a 5 cm square, and a metal jig with a base of 2 cm square was attached to the entire surface of the moisture-proof sheet. After sticking with an adhesive and curing at room temperature (about 23 ° C) for 24 hours, cut with a cutter knife up to the MDF along the metal jig, and in the direction perpendicular to the test piece with the measuring test equipment The tensile interface was evaluated by visually observing the peeling interface at that time and measuring the plane tensile strength.

(2) Evaluation results

  As shown in Table 1, it was confirmed that the example had a higher planar tensile strength that led to interfacial peeling than Comparative Examples 1 and 2. From this, it can be said that Example 1 has higher adhesiveness between the wooden substrate and the moisture-proof sheet than Comparative Examples 1 and 2.

DESCRIPTION OF SYMBOLS 1 Moisture-proof decorative board 2 Woody base material 3 First adhesive layer 4 Cosmetic sheet 5 Second adhesive layer 6 Moisture-proof sheet 9 Core material 10 Joinery 11 Base material layer 12 Deposition layer 13 Resin layer 14 First adhesion primer layer 15 Second primer layer for adhesion

Claims (9)

A wooden substrate;
A decorative sheet provided on one side of the wooden substrate;
A moisture-proof sheet provided on the other surface side of the wooden substrate,
An adhesive primer layer is provided on the surface of the moisture-proof sheet on the side of the wooden substrate,
The moisture-proof decorative board, wherein the adhesive layer that bonds the wooden substrate and the moisture-proof sheet contains an ethylene / vinyl acetate copolymer resin.   The moisture-proof decorative board according to claim 1, wherein the adhesion primer layer includes a urethane acrylic resin.   The decorative sheet includes at least one of a benzotriazole ultraviolet absorber, a benzophenone ultraviolet absorber, a triazine ultraviolet absorber, a hindered amine light stabilizer, and a hindered phenol antioxidant. The moisture-proof decorative board according to claim 1 or 2.   The moisture-proof decorative board according to any one of claims 1 to 3, wherein a pattern made of unevenness is provided on a surface of the decorative sheet. The moisture-proof sheet is
A base material layer comprising polyethylene terephthalate;
A vapor deposition layer containing an inorganic oxide provided on one surface side of the base material layer;
A resin layer containing polyvinyl alcohol provided on the vapor deposition layer;
A first adhesion primer layer provided on the resin layer;
A second adhesion primer layer provided on the other surface of the base material layer,
The moisture-proof decorative board according to any one of claims 1 to 4, wherein the other surface of the base material layer is a surface on the wood base material side.   The moisture-proof decorative board according to any one of claims 1 to 5, wherein the adhesive layer that bonds the wooden substrate and the decorative sheet contains an ethylene / vinyl acetate copolymer resin.   The moisture-proof decorative board according to any one of claims 1 to 6, wherein the moisture-proof sheet is thermoplastic. The moisture permeability of the moisture-proof sheet is 1.0 g / m ² · day or less, and
The moisture-proof decorative board according to any one of claims 1 to 7, wherein the moisture-proof sheet has transparency that allows the other surface side to be seen through from one side of the moisture-proof sheet. The moisture-proof decorative board according to any one of claims 1 to 8,
With a core material,
The fitting characterized in that the moisture-proof decorative board is affixed to at least one surface side of the core material.

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