JP6720497B2 - Moisture-proof veneer and fittings - Google Patents

Description

The present invention relates to a moisture-proof decorative plate and fittings, and for example, to a moisture-proof decorative plate used for fittings such as indoor doors, kitchen doors, storage doors, or fusuma, and fittings including the moisture-proof decorative plate.

For decorative boards such as indoor door panels, in order to prevent the warpage of the base material caused by 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 prevented. A moisture-proof sheet may be attached. That is, the decorative board is for improving the solid printing layer for giving concealing property to the surface of plywood, medium density fiberboard (MDF), veneer board, board material, and other multi-layered wood-based base materials, and improving the design. It is composed by laminating decorative sheets printed with the pattern-like layer. Then, in order to prevent deformation (warpage, dimensional change) due to temperature and humidity on these decorative boards, a method is known in which the back surface of the wooden base material is coated with a paint or a moisture-proof sheet is attached. .. As a moisture-proof sheet, there is one disclosed in Patent Document 1.

Japanese Patent No. 4946350

When the decorative board is left for a long period of time in an environment where the temperature and humidity change greatly, the wood base material may absorb and release moisture, and the decorative board may be deformed such as warped.
Therefore, the present invention has been made in view of such circumstances, and it is possible to prevent the wood base material from absorbing moisture, and to prevent deformation due to temperature or humidity from occurring. And to provide fittings.

In order to solve the above problems, a moisture-proof decorative board according to an aspect of the present invention is a wood base material, a decorative sheet provided on one surface side of the wood base material, the wood base material, and the decorative sheet. And a second moisture-proof sheet provided on the other surface side of the wooden base material.
Further, a fitting according to another aspect of the present invention comprises the above-mentioned moisture-proof decorative plate and a core material, wherein the moisture-proof decorative plate is attached to at least one surface side of the core material. To do.

According to one aspect of the present invention, it is possible to provide a moisture-proof decorative board and a fitting that can suppress the wood base material from absorbing moisture and suppress deformation such as warpage.

It is sectional drawing which shows the structural example of the moisture-proof decorative board 1 which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the structural example of the decorative sheet 6 which concerns on 1st Embodiment. It is sectional drawing which shows the structural example of the 2nd moisture-proof sheet 8 which concerns on 1st Embodiment. It is sectional drawing which shows the structural example of the fitting 10 which concerns on 1st Embodiment. It is sectional drawing which shows the structural example of the 2nd moisture-proof sheet 108 which concerns on 2nd Embodiment. It is sectional drawing which shows the structural example of the 2nd moisture-proof sheet 208 which concerns on 3rd Embodiment.

Embodiments of the present invention will be described below with reference to the drawings. In each of the drawings described below, portions corresponding to each other are designated by the same reference numerals, and repeated description of the portions designated by the same reference numerals will be appropriately omitted. 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. Various changes can be added to the technical idea of the present invention within the technical scope defined by the claims described in the claims.

<First Embodiment>
[Moisture-proof decorative board]
FIG. 1 is a cross-sectional view showing a configuration example of a moisture-proof decorative board 1 according to the first embodiment of the present invention. As shown in FIG. 1, the moisture-proof decorative board 1 is provided between a wooden base material 2, a decorative sheet 6 provided on one surface side of the wooden base material 2, and between the wooden base material 2 and the decorative sheet 6. The first moisture-proof sheet 4 and the second moisture-proof sheet 8 provided on the other surface side of the wooden base material 2 are provided. Further, the moisture-proof decorative board 1 is provided between the wooden base material 2 and the first moisture-proof sheet 4, and a first adhesive layer 3 for bonding the wooden base material 2 and the first moisture-proof sheet 4 together, A second adhesive layer 5 provided between the first moisture-proof sheet 4 and the decorative sheet 6 to bond the first moisture-proof sheet 4 and the decorative sheet 6, a wood base material 2, and a second moisture-proof sheet. And a third adhesive layer 7 which is provided between the wood base material 2 and the second moisture-proof sheet 8 and which is provided between the wood base material 2 and the second moisture-proof sheet 8.

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

(2) Decorative Sheet FIG. 2 is a cross-sectional view showing a configuration example of the decorative sheet 6. The decorative sheet 6 has a thermoplastic resin or paper as a base material. Examples of the thermoplastic resin include polypropylene, polyethylene, polyester, polyvinyl chloride and the like. From the viewpoint of designability, the thickness of the decorative sheet 6 is preferably 0.05 mm or more and 0.30 mm or less. Further, from the viewpoint of reducing heat generation, the decorative sheet 6 is preferably polyester, polyvinyl chloride, or the like, or a composite decorative sheet of these and another resin.

(2.1) Specific Example As a specific example, as shown in FIG. 2, the decorative sheet 6 includes a resin base material 61 and a pattern layer (that is, a printing layer) 62 formed on the resin base material 61. A surface protective layer (that is, an overlay film layer) 63 formed on the resin base material 61 and covering the pattern layer 62. The thickness of the resin base material 61 depends on the application of the decorative sheet 6 and the type of resin, but is preferably about 20 μm to 300 μm, more preferably about 50 μm to 200 μm. For example, as the resin base material 61, a polyester base material film having a thickness of 25 to 100 μm can be used. Examples of the method for molding the base material include an extrusion molding method, an inflation molding method, a calender molding method, and a cast molding method.

A paper base material may be used instead of the resin base material 61. As the paper base material, 20-50 g/m ² thin paper, inter-paper reinforcing paper, single-gloss kraft, or pure white roll can be used.
As the resin binder of the ink that forms the pattern layer 62, a cellulose derivative such as nitrocellulose (including one in which a part of 0H groups of cellulose is covered), polyvinyl alcohol, polyvinyl butyral, and a mixture thereof with an isocyanate compound. Alternatively, an acrylic acid amide-acrylic acid ester copolymer or a vinyl chloride-vinyl acetate copolymer can be used.

The method of forming the pattern layer 62 is not particularly limited, and 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, etc. can be used. .. In addition, for example, in the case where the entire surface is solid, in addition to the various printing methods described above, 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. It is also possible to use various coating methods such as the dip coating method. In addition, for example, a hand-drawing method, a black-wash method, a photography method, a laser beam or electron beam drawing method, a partial vapor deposition method of metal or the like, an etching method, or the like, or a combination of a plurality of these methods may be used.
The type of the pattern shown by the pattern layer 62 is not particularly limited, and may be, for example, a woodgrain pattern, a stone pattern, a cloth pattern, an abstract pattern, a geometric pattern, or the like, or in the case of merely coloring or color adjustment. It may be a solid plain color. Any desired pattern can be adopted depending on the application of the decorative sheet 6.

As the surface protective layer 63, a polyester prepolymer having a hydroxyl group (-OH), an acrylic prepolymer, a polyether prepolymer, a polyol prepolymer such as a partially saponified ethylene-vinyl acetate copolymer, and an isocyanate compound are mixed and crosslinked and cured. It is possible to use a resin formed by The thickness of the surface protective layer 63 is preferably about 10 μm to 200 μm, more preferably within the range of about 10 μm to 100 μm. Examples of the molding method of the surface protective layer 63 include an extrusion molding method, an inflation molding method, a calender molding method, and a cast molding method.
The surface protection layer 63 needs to be transparent enough to allow the pattern layer 62 therebelow to be seen through. Therefore, the surface protective layer 63 is particularly preferably colorless and transparent, but may be colored and transparent or semitransparent. The term “transparent” refers to a degree of transparency that allows the back side to be visually recognized from the front side. The surface protective layer 63 may contain a coloring agent or a filler as long as it has transparency.

(2.2) Weather-resistant formulation As a weather-resistant formulation, a weather-resistant formulation additive (benzotriazole-based UV absorber, benzophenone-based UV absorber, triazine-based UV absorber, hindered amine-based light stabilizer) is added to the resin base material 61. , Hindered phenolic antioxidants, etc.) may be appropriately added. These various additives may be used alone or in combination of two or more.
Examples of triazine-based compounds include 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[(hexyl)oxy]-phenol and 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, and mixtures, modified products, polymers and derivatives thereof can be used. Further, as the benzophenone type, octabenzone and its modified products, polymers and derivatives can be used.

By adding the hindered amine light stabilizer, the deterioration of the resin itself due to light, heat, water, etc. can be prevented. The hindered amine light stabilizer may be added in an amount of 0.1% to 10%, preferably 1% to 5% based on the resin solid content, although it may be added depending on the desired weather resistance. As the hindered amine light stabilizer, bis(1,2,2,6,6-pentamethyl-4-piperidyl)[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl] is used. Butyl malonate, bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, methyl(1,2,2,6,6-pentamethyl-4-poperidinyl) sebacate, bis(2)decanedioate , 2,6,6-Tetramethyl-1(octyloxy)-4-piperidinyl) ester and the like, and mixtures, modified products, polymers and derivatives thereof can be used.

(2.3) Thermal Barrier Formulation As a thermal barrier formula, the resin base material 61 may contain a pigment for increasing the reflectance of infrared light in the resin base material 61. As the pigment contained in the resin base material 61, at least one of isoindolinone, disazo, polyazo, diketopyrrolopyrrole, quinacridone, phthalocyanine, and titanium oxide is used.
For example, by including 23 parts by mass or more of titanium oxide in the resin base material 61, the heat shield property can be improved. Alternatively, the titanium oxide layer may be provided by applying titanium oxide to the surface of the resin base material 61 on which the pattern layer 62 is formed. When the titanium oxide layer is provided, the total of the content of titanium oxide in the titanium oxide layer and the content of titanium oxide in the resin base material 61 is 23 mass with respect to the entire titanium oxide layer and the resin base material 61. It may be more than one copy.
When the amount of titanium oxide added to the resin base material 61 increases, titanium oxide affects the film quality of the resin base material 61. Therefore, the preferable content of titanium oxide in the resin base material 61 is 23 parts by mass or more and 50 parts by mass or less.

(2.4) Prescription of Design As a prescription of design, a pattern having irregularities may be provided on the surface of the decorative sheet 6 (for example, the surface of the surface protective layer 63). An example of the uneven pattern is a pattern formed by embossing (that is, an embossed pattern). The type of embossed pattern is not particularly limited, and may be various patterns such as wood grain (particularly conduit pattern), stone pattern, cloth pattern, Japanese paper pattern, geometric pattern pattern, or only simple pattern. It may be matte, grainy, hairline, or suede-like.

Further, it is possible to further improve the designability by synchronizing these embossed patterns with the pattern layer 62, but if it is not necessary, it may be non-synchronized. It is also possible to provide an embossing that includes both a pattern that does not match.
The method for forming the embossed pattern is not particularly limited, but a mechanical embossing method using a metal embossing plate is general. In addition, there is no particular limitation on the time of forming the embossed pattern, and any time may be selected from before, simultaneously with, or after the surface protection layer 63 is laminated on the base material. Further, the embossed patterns having the same or different shapes may be formed plural times at plural times selected from each time.

(3) First moisture-proof sheet The first moisture-proof sheet 4 is a synthetic resin film. For example, the first moisture-proof sheet 4 is a film containing a polyester base material having a thickness of 10 to 100 μm. In order to obtain moisture resistance, a vapor-deposited layer of metal or inorganic oxide, a thin film layer, or the like may be provided on at least one of the front surface and the back surface.
Specific examples of the polyester base material include polyethylene terephthalate, polyethylene naphthalate, polypropylene terephthalate, polybutylene terephthalate and polypropylene naphthalate, and may be a mixture of two or more thereof. A vapor deposition layer is provided on at least one of the front surface and the back surface of this polyester base material. Examples of the vapor deposition layer include an inorganic material vapor deposition layer formed of a metal thin film typified by aluminum, and an inorganic oxide vapor deposition layer formed of an inorganic oxide thin film typified by silicon oxide, magnesium oxide, and aluminum oxide. The vapor deposition layer is formed by a known vapor deposition method such as a vacuum vapor deposition method and a plasma activated chemical reaction vapor deposition method. More preferably, an inorganic oxide vapor deposition layer in which the vapor deposition layer is transparent is used.

(4) Second Moisture-Proof Sheet FIG. 3 is a cross-sectional view showing a configuration example of the second moisture-proof sheet 8. As shown in FIG. 3, the second moisture-proof sheet 8 includes a base material layer 81 containing polyethylene resin, a first paper layer 82 provided on one surface side of the base material layer 81, and a base material layer. And a second paper layer 83 provided on the other surface side of 81. As the base material layer 81, for example, a biaxially stretched polyethylene terephthalate film can be mentioned. Further, as the first paper layer 82 and the second paper layer 83, for example, reinforced paper can be cited.

(5) First Adhesive Layer As shown in FIG. 1, a first adhesive layer 3 is provided between the wood base material 2 and the first moistureproof sheet 4. The wood base material 2 and the first moisture-proof sheet 4 are bonded by the first adhesive layer 3. The first adhesive layer 3 contains an adhesive of any type such as a thermoplastic resin type, a thermosetting type resin, or a rubber (elastomer) type. Known materials 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 resin, ethylene-ethyl acrylate copolymer and the like. Further, as the thermosetting resin-based adhesive, urea resin, melamine resin, phenol resin, resorcinol resin, furan resin, epoxy resin, unsaturated polyester resin, polyurethane resin, polyimide resin, polyamideimide, polybenzimidazole, polybenzo Examples thereof include thiazole. Rubber 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 thereof include copolymer rubber (SBS, SIS, SEBS, etc.).

(6) Second Adhesive Layer As shown in FIG. 1, a second adhesive layer 5 is provided between the first moisture-proof sheet 4 and the decorative sheet 6. The first moisture-proof sheet 4 and the decorative sheet 6 are adhered by the second adhesive layer 5. The second adhesive layer 5 may include the same type of resin as the first adhesive layer 3. For example, when the first adhesive layer 3 and the second adhesive layer 5 are made of the same type of resin, the types of adhesives used for forming both layers can be made common, so that the manufacturing cost of the moisture-proof decorative board 1 can be reduced. May contribute to the reduction of

Alternatively, as the first adhesive layer 3, a resin having an adhesive resin property of 400 to 800% at 25° C. and a maximum point stress of 5 to 20 MPa/mm ² may be used. Good. As a result, sufficient laminating strength and heat-resistant creep of the multi-layered film are given, and the multi-layered film is peeled off or chipped when laminating on a flat plate such as plywood, MDF, particle board, etc., during cutting or punching. You can prevent it. As the adhesive, a urethane resin formed by the reaction of a polyester polyol resin or an acrylic polyol resin and an isocyanate curing agent is preferably used. Further, the thickness of the adhesive layer is preferably 3 to 10 g/m ² .

(7) Third Adhesive Layer A third adhesive layer 7 is provided between the wooden base material 2 and the second moistureproof sheet 8. The wood base material 2 and the second moisture-proof sheet 8 are adhered by the third adhesive layer 7. The third adhesive layer 7 may include the same type of resin as the first adhesive layer 3. For example, when the first adhesive layer 3 and the third adhesive layer 7 are made of the same type of resin, the types of adhesives used for forming both layers can be made common, so that the manufacturing cost of the moisture-proof decorative board 1 can be reduced. May contribute to the reduction of

(Joint)
FIG. 4 is a cross-sectional view showing a configuration example of the fitting 10 according to the first embodiment of the present invention. As shown in FIG. 4, the fitting 10 includes the moisture-proof decorative board 1 and the core material 9 described above. Then, the second moisture-proof sheet 8 side of the moisture-proof decorative plate 1 is attached to at least one surface side of the core material 9 via an adhesive agent (not shown). For example, the moisture-proof decorative plate 1 is attached to one surface 9a and the other surface 9b of the core material 9, respectively. The fitting 10 can be used, for example, as an interior door, a kitchen door, a storage door, or a sliding door.

[Effects of First Embodiment]
According to the first embodiment of the present invention, the first moisture-proof sheet 4 is provided on one surface (for example, front surface) side of the wooden base material 2. Thereby, the movement of water between the outside world and the wood base material 2 can be suppressed. A second moisture-proof sheet 8 is provided on the other surface (for example, the back surface) side of the wooden base material 2. As a result, the movement of water between the core material 9 of the fitting 10 and the wooden base material 2 can be suppressed. Thus, the wood base material 2 is sandwiched between the first and second moisture-proof sheets 4 and 8 from the front and back sides, and moisture absorption and desorption from the front and back sides can be suppressed.
Therefore, for example, even when the moisture-proof decorative board 1 is placed for a long period of time in an environment where the temperature and humidity change greatly, it is possible to suppress expansion or contraction of the wood base material 2 due to moisture absorption and release. As a result, it is possible to prevent the moisture-proof decorative plate 1 from being deformed (warp or dimensional change) due to temperature or humidity.

[Modification]
In addition, in the said 1st Embodiment, the case where the 1st moisture-proof sheet 4 was a synthetic resin film was demonstrated. However, in the present invention, the structure of the first moisture-proof sheet 4 is not limited to this. For example, the first moisture-proof sheet 4 is similar to the second moisture-proof sheet 8 in that it includes a base material layer containing polyethylene resin, a first paper layer provided on one surface side of the base material layer, and a base material. And a second paper layer provided on the other surface side of the layer 81. Even in such a case, the same effects as the effects of the first embodiment described above are achieved.

<Second Embodiment>
In the above-described first embodiment, as shown in FIG. 3, the second moisture-proof sheet 8 includes a base material layer 81 containing polyethylene resin and a first base material layer 81 provided on one surface side of the base material layer 81. The paper layer 82 and the second paper layer 83 provided on the other surface side of the base material layer 81 have been described. The second moisture-proof sheet 8 has a structure in which the base material layer 81 is sandwiched between the first and second paper layers 82 and 83, and has a relatively simple structure. Therefore, the manufacturing cost of the moisture-proof decorative board 1 can be reduced. There is a possibility to contribute.
However, in the present invention, the configuration of the second moisture-proof sheet is not limited to this. For example, the second moisture-proof sheet 8 shown in FIG. 1 may have the same configuration as the first moisture-proof sheet 4 shown in FIG. Alternatively, the second moisture-proof sheet according to the present invention may have the configuration shown in the following second embodiment or third embodiment.

(1) Second Moisture-Proof Sheet FIG. 5 is a cross-sectional view showing a configuration example of the second moisture-proof sheet 108 according to the second embodiment of the present invention. As shown in FIG. 5, the second moisture-proof sheet 108 includes a base material layer 181 made of polyethylene terephthalate, a vapor deposition layer 182 made of an inorganic oxide provided on one surface side of the base material layer 181, and a vapor deposition layer. A resin layer 183 provided on 182 and having polyvinyl alcohol as a main component, and an adhesion primer layer 184 provided on the resin layer 183. The other surface of the base material layer 181 is the wood base material side surface (one surface) 6 a of the second moisture-proof sheet 108. A surface wettability modification portion 185 is provided on the other surface of the base material layer 181. The surface wettability modification portion 185 is formed by, for example, a physical surface modification treatment such as reactive etching treatment.

The second moisture-proof sheet 108 has a transparency that allows the one surface 108a side to be seen through from the other surface 108b side. The second moisture-proof sheet 108 may be colorless and transparent or colored and transparent. The term “transparent” refers to a degree of transparency that allows the back side to be visually recognized from the front side.
The water vapor permeability of the entire second moisture-proof sheet 108 is 1.0 g/m ² ·day or less. Further, the second moisture-proof sheet 108 preferably has an oxygen permeability of 1.0 g/m ² ·day or less as a whole of the second moisture-proof sheet 108.
The second moisture-proof sheet 108 may be thermoplastic. That is, the second moisture-proof sheet 108 may be a thermoplastic resin-based moisture-proof sheet. Next, each layer shown in FIG. 5 will be described more specifically.

(1.1) Base Material Layer The material of the base material layer 181 is an olefinic thermoplastic resin such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl alcohol copolymer, or a mixture thereof, polyethylene. Ester thermoplastic resins such as terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene naphthalate-isophthalate copolymer, polycarbonate, polyarylate, methyl polymethacrylate, ethyl polymethacrylate, butyl polyacrylate, etc. Examples thereof include acrylic thermoplastic resins, non-halogen thermoplastic resins such as polyimide, polyurethane, polystyrene, and acrylonitrile-butadiene-styrene resins.
Each of the above materials can be used for the base material layer 181. However, when the third adhesive layer 7 (see FIG. 1) for adhering the base material layer 181 and the wood base material 2 contains an ethylene/vinyl acetate copolymer resin (EVA) having a urethane bond, the base material A more suitable material for layer 181 may include polyethylene terephthalate (PET). This is because PET has a good adhesive compatibility with an ethylene/vinyl acetate copolymer resin-based adhesive having a urethane bond.

The base material layer 181 serves as a base material on which a vapor deposition layer 182 described below is provided on one surface, and is a biaxially stretched resin sheet because of its high mechanical strength and excellent dimensional stability. It is preferable (however, in the present embodiment, the base material layer 181 is not limited to biaxial stretching and may be unstretched). In addition, the base material layer 181 includes, for example, polyethylene terephthalate (PET). For example, the base material layer 181 is made of biaxially stretched polyethylene terephthalate or unstretched polyethylene terephthalate. The thickness of the base material layer 181 is, for example, in the range of 9 to 100 μm. The base material layer 181 is colorless and transparent or colored and transparent.
On the other surface (for example, the back surface) of the base material layer 181, a surface wettability modified portion 185 whose surface wettability is modified is provided. The surface wettability modification portion 185 is formed by modifying the surface wettability by making the surface rough at a nano level by a physical treatment such as reactive etching treatment or corona treatment. As the modification treatment, reactive etching treatment is preferable to corona treatment. The reason is that it has been confirmed that the reactive etching treatment has a higher maintainability of the adhesive strength over time than the corona treatment.

(1.2) Vapor Deposition Layer The vapor deposition layer 182 is made of a thin film of an inorganic oxide such as silicon oxide, magnesium oxide or aluminum oxide. Here, a metal thin film typified by aluminum has a metallic luster, but a thin film of an inorganic oxide is a transparent vapor deposition film.
The thickness of the vapor-deposited layer 182 varies depending on the type and composition of the inorganic oxide used, but is generally 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 the moisture-proof sheet may not be sufficiently fulfilled. When the 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. Therefore, the thickness of the vapor deposition layer 182 is more preferably within the range of 10 to 150 nm.

As a method of stacking the vapor deposition layer 182 on the base material layer 181, 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, the vacuum deposition method is the best in terms of productivity. It is preferable to use any one of an electron beam heating method, a resistance heating method, and an induction heating method as the heating means of the vacuum evaporation method, but in consideration of the wide range of selectivity of the evaporation material, the electron beam heating method or the resistance heating method is used. It is more preferable to use the method. Further, in order to improve the adhesion between the vapor deposition layer 182 and the base material layer 181, and the denseness of the vapor deposition layer 182, the vapor deposition layer 182 can be vapor deposited using a plasma assist method or an ion beam assist method. .. Further, in order to increase the transparency of the vapor deposition layer 182, reactive vapor deposition in which various gases such as oxygen are blown may be used during vapor deposition.

(1.3) Resin Layer The resin layer 183 contains polyvinyl alcohol as a main component. The main component is a component that occupies a high proportion in the whole substance, and refers to, for example, 70 parts by mass or more when the whole is 100 parts by mass. The resin layer 183 may be a composition containing polyvinyl alcohol and an inorganic oxide. The resin layer 183 is provided to protect the vapor deposition layer 182 and improve the gas barrier property of the vapor deposition layer 182.
For the resin layer 183, 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 is applied onto the vapor deposition layer 182 by a roll coating method, a gravure coating method, or the like. Formed by that. The resin layer 183 is colorless and transparent or colored and transparent.

(1.4) Adhesion Primer Layer The adhesion primer layer 184 is provided to improve adhesion with a core material described later. Specific examples of the adhesion primer layer 184 include ester resin, urethane resin, acrylic resin, polycarbonate resin, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral resin, and nitrocellulose resin. The adhesive primer layer 184 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 as a mixture to form an adhesive composition.
It is particularly preferable that the primer forming the adhesion primer layer 184 is made of a resin composed of a copolymer of acrylic resin and urethane resin and isocyanate. That is, the copolymer of acrylic resin and urethane resin contains an acrylic polymer component having a hydroxyl group at the end (component A), a polyester polyol component having a hydroxyl group at both ends (component B), and a diisocyanate component (component C). It can be obtained by reacting to form a prepolymer, and further adding a chain extender (component D) such as diamine to the prepolymer to extend the chain. By this reaction, polyester urethane is formed and at the same time, the acrylic polymer component is introduced into the molecule to form an acrylic-polyester urethane copolymer having a hydroxyl group at the terminal. The primer constituting the adhesion primer layer 184 is formed by reacting the terminal hydroxyl group of the acrylic-polyester urethane copolymer with isocyanate to cure it.

As the component A, a linear acrylic acid ester polymer having a hydroxyl group at the terminal is used. Specifically, linear polymethylmethacrylate (PMMA) having a hydroxyl group at the terminal is preferable because it has excellent weather resistance (particularly characteristics against photodegradation) and can be easily copolymerized with urethane to be compatibilized. .. Component A is an acrylic resin component in the copolymer, and those having a molecular weight of 5,000 to 7,000 (weight average molecular weight) are preferably used because they have particularly good weather resistance and adhesiveness. Further, as the component A, only those having a hydroxyl group at both ends may be used, but those having a conjugated double bond at one end may be mixed with the above-mentioned one having a hydroxyl group at both ends and used. Good.

Component B reacts with diisocyanate to form polyester urethane and constitutes a urethane resin component in the copolymer. As the component B, a polyester diol having hydroxyl groups at both ends is used. The polyester diol includes an addition reaction product of a diol compound having an aromatic or spiro ring skeleton and a lactone compound or its derivative, or an epoxy compound, a condensation product of a dibasic acid and a diol, and a cyclic ester compound. Examples thereof include polyester compounds that are derived. 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 the acid component, particularly adipic acid, and an adipate system using 3-methylpentenediol and 1,4-cyclohexanedimethanol as the diol component. It is polyester.

The urethane resin component formed by the reaction between the component B and the component C imparts flexibility to the adhesion primer layer 184 and contributes to the improvement of the adhesiveness. Further, the acrylic resin component made of an acrylic polymer contributes to the weather resistance and blocking resistance of the adhesion primer layer 184. In the urethane resin, the molecular weight of the component B may be within the range where a urethane resin capable of exhibiting sufficient flexibility can be obtained in the adhesive primer layer 184, and it may be adipic acid or a mixture of adipic acid and terephthalic acid, and 3 In the case of a polyester diol composed of -methylpentanediol and 1,4-cyclohexanedimethanol, 500 to 5000 (weight average molecular weight) is preferable.

As the component C, an aliphatic or alicyclic diisocyanate compound having two isocyanate groups in one molecule is used. Examples of the diisocyanate include tetramethylene diisocyanate, 2,2,4(2,4,4)-1,6-hexamethylene diisocyanate, isophorone diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, 1,4′-cyclohexyl. Examples thereof include diisocyanate. As the diisocyanate component, isophorone diisocyanate is preferable because of its excellent physical properties and cost. When reacting the components A to C, the equivalent ratio of the total amount of hydroxyl groups (which may be amino groups) of the acrylic polymer, the polyester polyol and the chain extender described below to the isocyanate group is adjusted so that the isocyanate groups become 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 polyester polyol end to form a polyester urethane resin component, and at the same time, the acrylic polymer end A compound obtained by adding diisocyanate to a hydroxyl group is also mixed, and a prepolymer in a state where excess isocyanate groups and hydroxyl groups remain is formed. As a chain extender to this prepolymer, for example, diamines such as isophoronediamine and hexamethylenediamine are added to react an isocyanate group with the chain extender, and the acrylic polymer component is introduced into the molecule of polyester urethane by chain extension. Thus, the acrylic-polyester urethane copolymer (I) having a hydroxyl group at the terminal can be obtained.

Well-known coating methods such as a gravure coating method and a roll coating method, in which an isocyanate is added to an acrylic-polyester urethane copolymer to obtain a coating solution in which the viscosity is adjusted in consideration of the coating method and the coating amount after drying. The primer layer 184 for adhesion may be formed by applying. Further, as the isocyanate, any isocyanate capable of reacting with the hydroxyl group of the acrylic-polyester urethane copolymer to be crosslinked and cured, for example, divalent or higher aliphatic or aromatic isocyanate can be used, Aliphatic isocyanates are preferred from the viewpoints of discoloration prevention and weather resistance. Specifically, tolylene diisocyanate, xylylene diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, lysine diisocyanate monomer, or a dimer or trimer of these monomers, or Examples thereof include polyisocyanates such as derivatives (adducts) obtained by adding these isocyanates to polyols.
The coating amount after drying of the adhesive primer layer 184, a from 1 to 20 g / ^{m 2,} preferably from 1 to 5 g / ^{m 2.} In addition, the adhesion primer layer 184 may be a layer to which additives such as a filler such as silica powder, a light stabilizer, and a colorant are added, if necessary.

(2) Third Adhesive Layer In the second embodiment, the third adhesive layer 7 that is disposed between the wooden base material 2 and the second moisture-proof sheet 108 and adheres them together has, for example, a urethane bond. Contains ethylene/vinyl acetate copolymer resin as a main component. Here, the main component means a component that accounts for a high proportion in the whole substance, and for example, refers to a case where the total amount is 100 parts by mass or more and 70 parts by mass or more.

[Effects of Second Embodiment]
The second embodiment has the same effects as the effects of the first embodiment described above.
Further, according to the second embodiment, the surface wettability modification portion 185 is provided on the surface (one surface) 108a of the second moisture-proof sheet 108 on the wood base material side. An ethylene/vinyl acetate copolymer resin adhesive layer having a urethane bond is provided as the third adhesive layer 7 between the one surface 108a and the wood base material 2. Thereby, the adhesiveness between the wooden base material 2 and the second moisture-proof sheet 108 can be enhanced, and for example, even when the moisture-proof decorative board 1 is placed in an environment where the temperature and humidity change greatly, the wooden base material The adhesiveness between the second moisture-proof sheet 108 and the second moisture-proof sheet 108 can be maintained higher.

[Modification]
The first moisture-proof sheet may have the same configuration as the second moisture-proof sheet 108 shown in FIG. That is, the surface of the first moisture-proof sheet on the side of the wood base material may be provided with a surface wettability modified portion whose surface wettability is modified. Then, the first adhesive layer may contain an ethylene/vinyl acetate copolymer resin having a urethane bond. With such a configuration, the adhesiveness between the wood base material 2 and the first moisture-proof sheet can be enhanced, and for example, even when the moisture-proof decorative board 1 is placed in an environment in which changes in temperature and humidity are large. The adhesiveness between the wood base material 2 and the first moisture-proof sheet can be maintained higher.

<Third Embodiment>
(1) Second Moisture-Proof Sheet FIG. 6 is a cross-sectional view showing a configuration example of the second moisture-proof sheet 208 according to the third embodiment of the present invention. As shown in FIG. 6, the second moisture-proof sheet 208 includes a base layer 211 made of resin, a vapor deposition layer 212 made of an inorganic oxide provided on one surface side of the base layer 211, and a vapor deposition layer 212. A resin layer 213 provided thereon, a first adhesive primer layer 214 provided on the resin layer 213, and a second adhesive primer layer 215 provided on the other surface side of the base material layer 211. With. The other surface of the base material layer 211 is a wood base material side surface (one surface) 208a of the second moisture-proof sheet 208.

The second moisture-proof sheet 208 has such a transparency that the one surface 208a side can be seen through from the other surface 208b side. The second moisture-proof sheet 208 may be colorless and transparent or colored and transparent. The term “transparent” refers to a degree of transparency that allows the back side to be visually recognized from the front side. The water vapor permeability of the entire second moisture-proof sheet 208 is 1.0 g/m ² ·day or less. The oxygen transmission rate of the entire second moisture-proof sheet 208 is preferably 1.0 g/m ² ·day or less.
The second moisture barrier sheet 208 may be thermoplastic. That is, the second moisture-proof sheet 208 may be a thermoplastic resin-based moisture-proof sheet. Next, each layer shown in FIG. 6 will be described more specifically.

(1.1) Base Material Layer The base material layer 211 is made of synthetic resin. As the material of the base material layer 211, for example, the same material as the base material layer 181 described in the second embodiment can be used.
In addition, also in the third embodiment, the other surface (for example, the back surface) of the base material layer 211 is provided with the surface wettability modified portion (not shown) whose surface wettability is modified. Good. The surface wettability modified portion is formed by a physical surface modification treatment such as reactive etching treatment or corona discharge treatment. The surface is roughened at the nano level by physical treatment such as reactive etching treatment or corona discharge treatment, and the surface wettability is modified.

(1.2) Vapor Deposition Layer, Resin Layer The configuration of the vapor deposition layer 212 and its manufacturing method are the same as those of the vapor deposition layer 182 described in the second embodiment, for example.
The configuration of the resin layer 213 and the manufacturing method thereof are the same as those of the resin layer 183 described in the second embodiment, for example.

(1.3) First and Second Adhesion Primer Layers The first adhesion primer layer 214 is provided to improve the adhesion with the core material described later. Further, the second adhesion primer layer 15 is provided to improve the adhesion to the wood base material 2. As the first and second adhesion primer layers 214 and 215, specifically, ester resin, urethane resin, acrylic resin, urethane-based acrylic resin (urethane acrylate), polycarbonate resin, vinyl chloride-vinyl acetate copolymer, polyvinyl are used. Butyral resin, nitrocellulose resin, etc. can be mentioned, and among these, urethane acrylic resin (urethane acrylate) can be mentioned as a particularly preferable example. The first and second adhesive primer layers 214 and 15 can be formed by using an appropriate coating means such as a roll coating method or a gravure printing method, using these resins alone or as a mixture to form an adhesive composition. ..

Like the adhesive primer layer 184 described in the second embodiment, the primer constituting the first and second adhesive primer layers 214 and 15 is a resin composed of a copolymer of acrylic resin and urethane resin and isocyanate. Is particularly preferable.
The first, respectively the coating amount after drying of the second adhesive primer layer 214,15 is from 1 to 20 g / ^{m 2,} preferably from 1 to 5 g / ^{m 2.} Further, the first and second adhesion primer layers 214 and 15 may be layers to which a filler such as silica powder, an additive such as a light stabilizer, and a colorant is added, if necessary.

(2) Third Adhesive Layer In the third embodiment, the third adhesive layer 7 arranged between the wood base material 2 and the second moisture-proof sheet 208 and adhering them is, for example, ethylene/acetic acid. Contains a vinyl copolymer resin as a main component. Here, the main component means a component that accounts for a high proportion in the whole substance, and for example, refers to a case where the total amount is 100 parts by mass or more and 70 parts by mass or more.

[Effects of Third Embodiment]
The third embodiment has the same effects as the effects of the first embodiment described above.
Further, according to the third embodiment, the second adhesive primer layer 215 is provided on the surface (one surface) 208a of the second moisture-proof sheet 208 on the wood base material side. An ethylene/vinyl acetate copolymer resin adhesive layer is provided as the third adhesive layer 7 between the one surface 208a and the wood base material 2. Thereby, the adhesiveness between the wooden base material 2 and the second moisture-proof sheet 208 can be enhanced, and for example, even when the moisture-proof decorative board 1 is placed in an environment where the temperature and humidity greatly change, the wooden base material The adhesiveness between the second moisture-proof sheet 208 and the second moisture-proof sheet 208 can be maintained high.

<Example>
Next, the present invention will be described in more detail with reference to the following examples.
First, the second moisture-proof sheet 8 was produced. Here, reinforced paper was attached to both surfaces of the biaxially stretched polyethylene terephthalate film via an adhesive to obtain a second moisture-proof sheet 8. The biaxially stretched polyethylene terephthalate film had a thickness of 12 μm.
Moreover, the decorative sheet 6 was produced. Here, a pattern layer is printed with a nitrocellulose ink (manufactured by Toyo Ink Mfg. Co., Ltd.) on the surface of an inter-paper reinforcing paper (manufactured by Tenma Special Paper Co., Ltd.) having a basis weight of 30 g/m ^{2 and} the pattern is printed. Acrylic urethane resin (two-component curing type, manufactured by Toyo Ink Mfg. Co., Ltd.) was applied on the layer in a solid content of 6 g/m ² to form a resin-based surface protection layer. As described above, the decorative sheet 6 was obtained.
As the first moisture-proof sheet 4, a 12-μm thick polyester moisture-proof film (“GL film” manufactured by Toppan Printing Co., Ltd.) was prepared.

Next, the first moisture-proof sheet 4 and the decorative sheet 6 are attached to one surface of the wooden base material 2, and the second moisture-proof sheet 8 is attached to the other surface of the wooden base material 2 to form a moisture-proof decorative plate. 1 was produced. Here, the second moisture-proof sheet 8 and the decorative sheet 6 produced by the above method, the first moisture-proof sheet 4, the medium-density fiberboard (MDF) having a thickness of 6 mm as the wood base material 2, An ethylene/vinyl acetate copolymer resin emulsion adhesive, which is a material for the third adhesive layers 3, 5, and 7, was prepared.
An ethylene/vinyl acetate copolymer resin emulsion adhesive was applied to one surface of the MDF to form a first adhesive layer 3. The first moisture-proof sheet 4 was attached to the MDF via the first adhesive layer 3. Further, an ethylene/vinyl acetate copolymer resin emulsion adhesive was applied on the first moisture-proof sheet 4 to form a second adhesive layer 5. The back surface (that is, the surface on the resin base material 61 side) of the decorative sheet 6 was attached to the first moisture-proof sheet 4 via the second adhesive layer 5. Further, an ethylene/vinyl acetate copolymer resin emulsion adhesive was applied to the other surface of the MFD to form a third adhesive layer 7. The one surface 8a of the second moisture-proof sheet 8 was attached to the MDF via the third adhesive layer 7. Thus, the moisture-proof decorative board 1 was obtained.

After that, the moisture-proof decorative board 1 produced by the above method was attached to both surfaces of the core material 9 to produce a fitting 10. Here, two moisture-proof decorative boards 1 produced by the above method, a wood-based core material 9, and a 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 attached thereto. A vinyl acetate emulsion adhesive was applied to the other surface (for example, the back surface) of the core material 9, and the second moisture-proof decorative plate 1 was attached thereto. The fitting 10 was obtained by the above. The fitting 10 can be suitably used for, for example, an indoor door, a kitchen door, a storage door, or a sliding door.

<Comparative example>
In the comparative example, unlike the example, the first moisture-proof sheet was not attached to the MDF. In the comparative example, a vinyl acetate emulsion adhesive was applied to one surface of the MDF to form a first adhesive layer. The back surface of the decorative sheet was attached to the MDF via the first adhesive layer.
Except for this, a decorative board was produced in the same manner as in the example.

<Evaluation>
With respect to the moisture-proof decorative board according to the example produced above and the decorative board according to the comparative example, water vapor permeability and plane tensile strength were evaluated.
(1) Evaluation of Water Vapor Permeability In accordance with JIS Z 0208 “Moisture Permeability Test Method for Moisture Proof Packaging Materials (Cup Method)”, the moisture proof decorative sheet of the example and the decorative sheet of the comparative example are measured to permeate water vapor. The degree was calculated. The unit of water vapor permeability is g/m ² ·day.
In addition, the moisture-proof decorative sheet of the embodiment means a sheet having a laminated structure in which the back surface of the decorative sheet 6 is attached onto the first moisture-proof sheet 4 via the second adhesive layer 5 (first moisture-proof sheet 4/first sheet). 2 means the adhesive layer 5/decorative sheet 6).

(2) Evaluation of plane tensile strength Plane tensile strength: Based on JAS plywood plane tensile test, the plane tensile strength of the moisture-proof decorative board of an example and the decorative board of a comparative example was measured. The unit of plane tensile strength is N/cm ² .
The moisture-proof decorative plate used for evaluation was obtained by cold-pressing a moisture-proof sheet and MDF for 24 hours. The moisture-proof decorative plate was cut into 5 cm squares, and a metal jig having a 2 cm square bottom was covered with cyanoacrylate on one surface of the moisture-proof sheet. After sticking with a system adhesive and curing at room temperature (about 23°C) for 24 hours, make a notch that reaches the MDF along the metal jig with a cutter knife, and in the direction perpendicular to the test piece with the measurement test equipment. Tensile, the peeling interface at that time was visually observed and evaluated, and the plane tensile strength was measured.

(3) Evaluation Results The evaluation results of water vapor permeability are as follows.

また、平面引張強度の評価結果は、以下の通りである。

The evaluation results of the plane tensile strength are as follows.

As is clear from Table 1, it was confirmed that the moisture-proof decorative sheets of Examples had improved water vapor permeability as compared with the conventional one. From this, it can be seen that the example can significantly reduce the warp of the decorative plate caused by the change in the temperature and humidity of the atmosphere, as compared with the comparative example.
Further, as is clear from Table 2, it was confirmed that the moisture-proof decorative board of the example has a larger plane tensile strength than the decorative board of the comparative example. From this, it can be said that the example has higher adhesiveness between the wood base material and the moisture-proof sheet than the comparative example.

From the above, it was found that, as compared with the comparative example, the example can suppress the wood base material from absorbing moisture and suppress the occurrence of deformation such as warpage. It was also found that the plane tensile strength was sufficiently high.

1 Moisture-Proof Decorative Plate 2 Wood Base Material 3 First Adhesive Layer 4 First Moisture-Proof Sheet 5 Second Adhesive Layer 6 Decorative Sheet 7 Third Adhesive Layers 8, 108, 208 Second Moisture-Proof Sheet 9 Core Material 10 Joinery 61 resin base material 62 picture layer 63 surface protection layer 81 base material layer 82 first paper layer 83 second paper layers 181, 211 base material layers 182, 212 vapor deposition layers 183, 213 resin layer 184 adhesive primer layer 185 surface Wettability modifier 214 First adhesion primer layer 215 Second adhesion primer layer

Claims (8)

A wood base material,
A decorative sheet provided on one surface side of the wooden base material,
A first moisture-proof sheet provided between the wooden base material and the decorative sheet,
A second moisture-proof sheet provided on the other surface side of the wooden base material;
A first adhesive layer which is provided between the wood-based material and the first moisture-proof sheet, and which bonds the wood-based material and the first moisture-proof sheet,
A third adhesive layer that is provided between the wood base material and the second moisture-proof sheet, and that bonds the wood base material and the second moisture-proof sheet ,
It said first adhesive layer is in the range elongation of not more than 800% more than 400% of the resin properties 25 ° C. under conditions of the adhesive, and the range maximum point stress of 5MP a following on 20 mP a hereinafter Uchidea is,
The surface of the second moisture-proof sheet on the side of the wood base material is provided with a surface wettability modified portion whose surface wettability is modified,
The third adhesive layer contains an ethylene/vinyl acetate copolymer resin having a urethane bond,
The second moisture-proof sheet,
An unstretched substrate layer containing 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 adhesive primer layer provided on the resin layer,
Proof veneer to the other surface of the base material layer has a surface der Rukoto of the wood substrate side. The second adhesive layer, which is provided between the first moisture-proof sheet and the decorative sheet, and which adheres the first moisture-proof sheet and the decorative sheet, further comprises a second adhesive layer. Moisture-proof decorative board. The first moisture-proof sheet,
A base material layer containing a polyethylene resin,
A first paper layer provided on one surface side of the base material layer;
The 2nd paper layer provided in the other surface side of the said base material layer, The moisture-proof decorative board of Claim 1 or Claim 2 characterized by the above-mentioned. The surface of the first moisture-proof sheet on the side of the wood base material is provided with a surface wettability modified portion whose surface wettability is modified,
The moisture-proof decorative board according to claim 1 or 2, wherein the first adhesive layer contains an ethylene/vinyl acetate copolymer resin having a urethane bond. The second moisture-proof sheet, the first aspect and the base layer side of the surface wetting-property-modifying region, characterized by further comprising a second adhesive primer layer provided on the opposite side The moisture-proof decorative board according to claim 4 . The moisture-proof decorative board according to any one of claims 1 to 5 , wherein the decorative sheet has a thermoplastic resin or paper as a base material. The moisture-proof decorative board according to any one of claims 1 to 6 , wherein the surface of the decorative sheet is provided with an uneven pattern. A moisture-proof decorative plate according to any one of claims 1 to 7 ,
With a core material,
The fitting, wherein the moisture-proof decorative plate is attached to at least one surface side of the core material.

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