JP2008105381A - Moistureproof sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a moistureproof sheet which prevents warpage and does not deteriorate the commercial value even when applied in a place having a large difference in temperature and humidity between both sides in doors, sliding doors, and partitioning or the like, or is less likely to be separated even after long-term use or upon exposure to external force, and a decorative sheet produced by applying the moisture sheet. <P>SOLUTION: The moistureproof sheet comprises a synthetic resin base material layer, and a vapor deposited layer, and an adhesive primer layer is provided on the respective exposed surfaces of the synthetic resin base material and the vapor deposited layer. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a moisture-proof sheet to be adhered to a wooden base material and a decorative board using the same, and more particularly, has a function of preventing warping caused by moisture absorption and moisture release of a wooden base material due to changes in environmental temperature and humidity. The present invention relates to a moisture-proof sheet and a decorative board using the same.

  Conventionally, a decorative board in which a decorative sheet is attached to the surface of a woody base material such as plywood, medium density fiber board (MDF), hard board, particle board, etc. has been used as a surface material for doors, sliding doors, partitions, etc. . If the moisture content of the wooden base material is lower than the equilibrium moisture content of the wooden base material under outdoor air conditions, moisture absorption and water absorption will take place from the surface of the decorative board where the decorative sheet is not adhered, and this surface will expand. On the other hand, if the moisture content of the wooden base material is greater than the equilibrium moisture content of the wooden base material under the open air condition, the decorative sheet is attached to the moisture-based and water-releasing shrinkage. Since the surface to which the decorative sheet is applied is almost free from moisture absorption and desorption, the expansion rate or contraction rate differs between the surface on which the decorative sheet of the decorative board is adhered and the surface on which the wooden base material is exposed, and the decorative board warps. As a result, the product value is reduced.

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

  Although the method of reinforcing the decorative plate can prevent warping by reinforcing, there is a problem that warping cannot be prevented in the case of a structure that cannot sufficiently perform reinforcement such as a flash door. In addition, the method of coating the paint has a problem that it is difficult to form a uniform moisture-proof and waterproof layer due to strong suction of the paint on the surface of the wooden base material and poor surface smoothness. A method of sticking a synthetic resin sheet or a moisture-proof sheet is adopted and widely used because it can be applied to a flash door and warpage can be prevented to some extent.

However, even if it is a decorative board that adopts a method of sticking a synthetic resin sheet or moisture proof sheet, if it is used for a long time in doors, sliding doors, partitions etc. that have a large difference in temperature and humidity environment on both sides, There is a difference in the moisture distribution of the wood-based substrate between the one surface side and the other surface side. As a result, the degree of expansion and contraction of both surfaces is different, and warping may occur. In addition, as another problem, when using a moisture-proof sheet, both sides are paper layers, and an excellent effect in terms of workability that it can be easily attached to a wooden substrate with an emulsion type adhesive. On the other hand, since the interlayer strength of the paper layer is weak, there is a possibility of peeling from the interlayer of the paper layer when used for a long time or when an external force is applied by force.
Japanese Patent Laid-Open No. 9-29919

  Accordingly, the present invention provides a moisture-proof sheet that prevents warping and does not reduce the commercial value of a door, sliding door, partition, or the like even in a place where the temperature and humidity environment on both sides is greatly different, and a decorative board using the moisture-proof sheet It is also to provide a moisture-proof sheet that does not peel off when used for a long period of time or when external force is applied forcefully, and a decorative board using the moisture-proof sheet.

  In order to achieve the above-mentioned object, the inventor of the present invention is a moisture-proof sheet comprising a synthetic resin base material layer and a vapor deposition layer, the exposed surface of the synthetic resin base material layer. It is characterized by being provided with an adhesion primer layer.

  The invention described in claim 2 is characterized in that, in the moisture-proof sheet according to claim 1, an adhesion primer layer is provided on the exposed surface of the vapor-deposited layer.

  Moreover, this invention of Claim 3 is a moisture-proof sheet | seat which consists of a synthetic resin base material layer and a vapor deposition layer, Comprising: A decorative sheet is affixed on the exposed surface of the said synthetic tree base material layer through an adhesive layer. It is characterized by being worn.

  According to a fourth aspect of the present invention, in the moisture-proof sheet according to the third aspect, an adhesion primer layer is provided on the exposed surface of the vapor deposition layer.

  A decorative board of the present invention according to claim 5 is characterized in that the moisture-proof sheet according to any one of claims 1 and 2 is adhered to one surface of a base material for decorative board. is there.

  The decorative board of the present invention according to claim 6 is characterized in that the moisture-proof sheet according to any one of claims 3 and 4 is adhered to the other surface of the decorative board according to claim 5. Is.

  The present invention according to claim 7 is a moisture-proof sheet comprising a synthetic resin substrate layer, a vapor deposition layer, an adhesive layer, and a first synthetic resin layer, wherein the synthetic resin substrate layer and the first An adhesive primer layer is provided on each exposed surface of the synthetic resin layer.

  Moreover, the present invention according to claim 8 is the moisture-proof sheet according to claim 7, characterized in that a second synthetic resin layer is interposed between the synthetic resin substrate layer and the adhesion primer layer. To do.

  Further, the present invention according to claim 9 is the moisture-proof sheet according to any one of claims 7 and 8, wherein the pattern printing layer and the surface protective layer are sequentially formed on the adhesive primer layer surface formed on the first synthetic resin layer surface. It is characterized by being formed.

  The decorative board of the present invention according to claim 10 is characterized in that the moisture-proof sheet according to any one of claims 7 and 8 is adhered to one surface of the base material for decorative board. is there.

  The decorative board of the present invention according to claim 11 is characterized in that the moisture-proof sheet according to claim 9 is adhered to the other surface of the decorative board according to claim 10.

Since the moisture-proof sheet of the present invention has a moisture permeability (JIS Z 0208) of 2.0 g / m ² · 24 hr or less, the moisture-proof sheet is made of a synthetic resin sheet such as vinyl chloride, polyethylene, polypropylene, or paper / polyethylene / paper. It has much better moisture-proof performance than the sheet, and the decorative board using the moisture-proof sheet of the present invention can be used in places where there is a large difference in the temperature and humidity environment on both sides, such as doors, sliding doors, and partitions. , There is an excellent effect of hardly causing warping. Further, the moisture-proof sheet of the present invention and the decorative board using the moisture-proof sheet have an excellent effect that there is almost no possibility of peeling when used for a long time or when an external force is applied by force majeure.

The above-described present invention will be described in detail below with reference to the drawings.
FIG. 1 is a layer configuration diagram schematically showing a first embodiment of a moisture-proof sheet according to the present invention, FIG. 2 is a layer configuration diagram schematically showing a second embodiment of the moisture-proof sheet according to the present invention, and FIG. FIG. 4 is a layer configuration diagram schematically showing a fourth embodiment of the moisture-proof sheet according to the present invention, and FIG. 5 is a moisture-proof sheet according to the present invention. FIG. 6 is a layer configuration diagram schematically showing one embodiment of a decorative board using the moisture-proof sheet of the present invention, and FIG. 7 is a diagram of the moisture-proof sheet of the present invention. It is a layer block diagram which shows the other Example of the used decorative board schematically, In the figure, 1 (a) -1 (e) is a moisture-proof sheet, 2 (a), 2 (b) is a decorative board, 10 Is a base layer made of synthetic resin, 11 is a vapor deposition layer, 12 and 19 are adhesive layers, 13 is a first synthetic resin layer, 14 is a second synthetic resin layer, 15 16 adhesive primer layer, 17 picture-printed layer, 18 is a surface protective layer, 20 denotes decorative plate substrate, 30 is a decorative sheet, respectively.

  FIG. 1 is a layer configuration diagram schematically showing a first embodiment of a moisture-proof sheet according to the present invention. The moisture-proof sheet 1 (a) is bonded to a vapor deposition layer 11 on one surface of a base layer 10 made of synthetic resin. And a primer layer 15 for adhesion is formed on the other surface of the base layer 10 made of synthetic resin. Note that the layer configuration shown in FIG. 1 shows the most preferable mode, and the adhesive primer layer 16 provided on the vapor deposition layer side is not necessarily provided, particularly when the required level of adhesive strength is low. Is.

  FIG. 2 is a layer configuration diagram schematically showing a second embodiment of the moisture-proof sheet according to the present invention. The moisture-proof sheet 1 (b) is a vapor deposition layer 11 on one surface of the base layer 10 made of synthetic resin. The primer layer 16 for adhesion is formed, and the decorative sheet 30 is stuck to the other surface of the base layer 10 made of synthetic resin via the adhesive layer 12. In this case as well, as in the first embodiment, when the required level of adhesive strength is low, the adhesion primer layer 16 provided on the vapor deposition layer side is not necessarily provided. Further, as the decorative sheet 30, a well-known sheet having a specification in which the base sheet is made of paper or a specification made of a thermoplastic resin can be used, for example, Japanese Patent Publication No. 63-52580 and Japanese Patent Laid-Open No. No. 16832, JP-A-11-207897, JP-A-2001-9972, JP-A-2003-276133, and the like can be used.

  FIG. 3 is a layer configuration diagram schematically showing a third embodiment of the moisture-proof sheet according to the present invention. The moisture-proof sheet 1 (c) is a vapor-deposited layer 11 on one surface of the base layer 10 made of synthetic resin. The adhesive layer 12, the first synthetic resin layer 13, and the adhesion primer layer 16 are formed, and the adhesion primer layer 15 is formed on the other surface of the synthetic resin substrate layer 10.

  FIG. 4 is a layer configuration diagram schematically showing a fourth embodiment of the moisture-proof sheet according to the present invention, wherein the moisture-proof sheet 1 (d) is the synthetic resin substrate layer 10 in the moisture-proof sheet 1 (c). The second synthetic resin layer 14 is formed between the adhesive primer layer 15 and the adhesive primer layer 15, and the other portions are the same as the moisture-proof sheet 1 (c) shown in FIG. Moreover, although not shown in figure, the primer layer for adhesion | attachment is provided in the surface where the said 2nd synthetic resin layer 14 of the said synthetic resin base material layers 10 is laminated | stacked as needed.

  FIG. 5 is a layer configuration diagram schematically showing a third embodiment of the moisture-proof sheet according to the present invention. The moisture-proof sheet 1 (e) is a surface of the adhesion primer layer 16 in the moisture-proof sheet 1 (c). The printed surface 17 and the surface protective layer 18 are formed on the entire surface on which the printed pattern 17 is formed, and the rest is the same as the moisture-proof sheet 1 (c) shown in FIG. Further, although not shown, the surface of the moisture-proof sheet 1 (d) shown in FIG. 4 is formed on the entire surface where the pattern printing layer 17 and the pattern printing layer 17 are formed on the exposed surface of the primer layer 16 for adhesion as in FIG. The protective layer 18 may be formed.

  FIG. 6 is a layer configuration diagram schematically showing one embodiment of a decorative board using the moisture-proof sheet of the present invention, and the decorative board 2 (a) is formed on one surface of the decorative board substrate 20. The moisture-proof sheet 1 (b) shown in FIG. 2 is stuck through the adhesive layer 19 so that the decorative sheet 30 is exposed, and the moisture-proof sheet 1 (a) shown in FIG. The adhesive primer layer 15 is attached through an adhesive layer 19 so that the adhesive primer layer 15 is exposed.

  FIG. 7 is a layer configuration diagram schematically showing an embodiment of a decorative board using the moisture-proof sheet of the present invention. The decorative board 2 (b) is disposed on one surface of the decorative board substrate 20 as described above. The moisture-proof sheet 1 (e) shown in FIG. 5 is stuck through the adhesive layer 19 so that the pattern print layer 17 is exposed, and the moisture-proof sheet 1 (c) shown in FIG. The adhesive primer layer 16 is stuck through an adhesive layer 19 so as to be exposed.

  Next, materials constituting the moisture-proof sheets 1 (a) to 1 (e) and the decorative plates 2 (a) and 2 (b) will be described. First, as the base layer 10 made of synthetic resin, olefinic thermoplastic resin such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl alcohol copolymer, or a mixture thereof, polyethylene terephthalate, polybutylene. Ester thermoplastics such as terephthalate, polyethylene naphthalate, polyethylene naphthalate-isophthalate copolymer, polycarbonate, polyarylate, acrylic thermoplastics such as methyl polymethacrylate, ethyl polymethacrylate, butyl polyacrylate Examples thereof include non-halogen thermoplastic resins such as resin, polyimide, polyurethane, polystyrene, and acrylonitrile-butadiene-styrene resin. The synthetic resin substrate layer 10 may be a uniaxially or biaxially stretched sheet or may be unstretched, but will be a substrate on which a vapor deposition layer described later is formed on at least one surface. A sheet stretched in the biaxial direction is preferable for reasons such as high mechanical strength and excellent dimensional stability. The thickness of the synthetic resin substrate layer 10 is generally 9 to 25 μm.

The vapor deposition layer 11 is an inorganic vapor deposition layer made of a metal thin film typified by aluminum, or an inorganic oxide vapor deposition layer made of an inorganic oxide thin film typified by silicon oxide, magnesium oxide, or aluminum oxide. The deposited layer 11 is formed as a thin film on at least one surface of the synthetic resin substrate layer 10 by a known deposition method such as a vacuum deposition method or a plasma activated chemical reaction deposition method. As the vapor deposition layer 11, the vapor deposition layer made of a metal thin film typified by aluminum has a metallic luster. There is a problem that the metallic luster must be concealed from the point, and there are cases where bonding is performed using high frequency during flash door processing,
More preferably, it is an inorganic oxide vapor deposition layer whose vapor deposition layer is transparent. In addition, for the purpose of further improving the gas barrier property of the vapor deposition layer 11, a composition in which an inorganic oxide typified by silicon oxide, magnesium oxide, and aluminum oxide is added to the vapor deposition layer 11 is polyvinyl alcohol or polyvinyl alcohol. The polyvinyl alcohol layer or the composition layer may be formed by coating by a known coating method such as a roll coating method or a gravure coating method.

  Further, as the first synthetic resin layer 13 and the second synthetic resin layer 14, the resin described in the synthetic resin base material layer 10 or a sheet of resin can be used, and the thickness thereof is as follows. Approx. 9-30 μm.

  Next, the adhesive layer 12 and the adhesion primer layers 15 and 16 will be described. Examples of the resin used for the adhesive layer 12 and the adhesion primer layers 15 and 16 include ester resins, urethane resins, acrylic resins, polycarbonate resins, vinyl chloride-vinyl acetate copolymers, polyvinyl butyral resins, Nitrocellulose-based resins and the like can be mentioned, and these resins can be used alone or mixed to form an adhesive composition, which can be formed using an appropriate application means such as a roll coating method or a gravure printing method.

  However, it is particularly preferable that the adhesive layer 12 and the adhesion primer layers 15 and 16 are formed of a resin comprising (I) a copolymer of an acrylic resin and a urethane resin and (II) an isocyanate. That is, the copolymer of acrylic resin and urethane resin (I) has 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) is mixed and reacted to form 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. This acrylic-polyester urethane copolymer is formed by reacting the terminal hydroxyl group with the isocyanate (II) and curing it.

  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. . The 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, the component A may be used only having a hydroxyl group at both ends, but a mixture having a conjugated double bond at one end is mixed with the above-mentioned one having a hydroxyl group at both ends. Is also good.

  Component B reacts with diisocyanate to form polyester urethane and constitutes a urethane resin component in the copolymer. The 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. it can. In addition, 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.

  In the adhesive layer 12 and the adhesion primer layers 15 and 16, the urethane resin component formed by the reaction between the component B and the component C is the adhesive layer 12 and the adhesion primer layers 15 and 16. Gives flexibility and improves adhesion. The acrylic resin component made of an acrylic polymer contributes to weather resistance and blocking resistance in the adhesive layer 12 and the adhesion primer layers 15 and 16. 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 adhesive layer 12 and the adhesion primer layers 15 and 16 is obtained, and adipic acid or In the case of a polyester diol composed of a mixture of adipic acid and terephthalic acid and 3-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, 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 above-mentioned components A to C are reacted, the equivalent ratio of the total hydroxyl group (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. To.

  When the above 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 an acrylic polymer. A compound in which a diisocyanate is added to a terminal hydroxyl group is also mixed, and a prepolymer is formed in a state where excess isocyanate groups and hydroxyl groups remain. As a chain extender, for example, a diamine such as isophorone diamine or hexamethylene diamine is added to this prepolymer, the isocyanate group is reacted with the chain extender, and the chain is extended so that the acrylic polymer component is contained in the polyester urethane molecule. The (I) acrylic-polyester urethane copolymer introduced and having a hydroxyl group at the terminal can be obtained.

  Addition of isocyanate of (II) to acrylic-polyester urethane copolymer of (I), coating method, coating solution adjusted to necessary viscosity in consideration of coating amount after drying, gravure coating method, roll The adhesive layer 12 and the adhesion primer layers 15 and 16 may be formed by application by a known application method such as a coating method. The isocyanate of (II) is not limited as long as it can be crosslinked and cured by reacting with the hydroxyl group of the acrylic-polyester urethane copolymer of (I). An aliphatic isocyanate can be used, and an aliphatic isocyanate is particularly desirable from the viewpoint of thermal 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.

Incidentally, as the coating amount after drying of the adhesive layer 12 and the adhesive primer layer 15 and 16, a from 1 to 20 g / m ^2, preferably from 1 to 5 g / m ^2. Further, the adhesive layer 12 and the adhesion primer layers 15 and 16 may be layers to which an additive such as a filler such as silica powder, a light stabilizer, or a colorant is added as necessary.

  The pattern printing layer 17 can be formed using ink by a known printing method such as a gravure printing method, an offset printing method, or a silk screen printing method. Examples of the pattern print layer 17 include patterns such as a wood grain pattern, a stone pattern, a cloth pattern, a skin pattern, a geometric pattern, characters, symbols, line drawings, and various abstract patterns. Examples of the ink for forming the pattern printing layer 17 include chlorinated polyolefins such as chlorinated polyethylene and chlorinated polypropylene as a vehicle, polyester, polyurethane composed of isocyanate and polyol, polyacryl, polyvinyl acetate, polyvinyl chloride, and vinyl chloride. -One or two or more types of vinyl acetate copolymer, cellulose resin, polyamide resin, etc. may be mixed and used by adding pigments, solvents, various auxiliary agents and the like to ink.

  The surface protective layer 18 is provided for imparting surface properties such as scratch resistance, abrasion resistance, stain resistance, water resistance, and weather resistance. The surface protective layer 18 is formed. The resin is suitably formed using a curable resin such as a known thermosetting resin or ionizing radiation curable resin.

  Further, as the decorative sheet 30 to be adhered to the moisture-proof sheet 1 (b) shown in FIG. 2, for example, a well-known decorative sheet made of a paper base material or a synthetic resin base material on which a pattern printing made of a wood grain pattern is applied at least. Can be applied.

  Next, the adhesive layer 19 will be described. The adhesive layer 19 is a layer used for adhering the moisture-proof sheets 1 (a) to 1 (e) and the decorative board substrate 20, and as an adhesive forming the adhesive layer 19, For example, any type of adhesive such as a thermoplastic resin, a thermosetting resin, or a rubber (elastomer) may be used. These 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, ethylene-ethyl acrylate copolymer, etc., and 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, polybenzothiazole, etc. That. 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 include copolymer rubber (SBS, SIS, SEBS, etc.). In particular, the adhesive layer 19 for adhering the moisture-proof sheet 1 (b) on which the decorative sheet is provided, or the moisture-proof sheet 1 (e) on which the pattern printing layer 17 is provided and the base material 20 for decorative board is used as the base for decorative board. In order to conceal the surface color of the material 20 and improve the design, it may be colored with a pigment or the like.

  Examples of the decorative board substrate 20 include wood-based substrates such as plywood, particle boards, medium density fiber boards (MDF), and high density fiber boards (HDF), and substrates made of a flash structure. .

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

A two-part curable urethane-based adhesive is solidified on the surface of the vapor layer of a 12 μm-thick biaxially stretched polyethylene terephthalate film (hereinafter referred to as a 12 μm-thick vapor-deposited PET film) provided with a silica vapor-deposited layer on one side. 3 g / m ^{2 was} applied and dried, and a laminate (PET 12 μm / deposition layer / PE 15 μm) was obtained by heating and extruding polyethylene (hereinafter referred to as PE) to a thickness of 15 μm on the coated surface with a T-die extruder. Was made. After subjecting both exposed surfaces of the laminate to corona discharge treatment, a two-part curable resin in which isocyanate as a curing agent is added to a urethane resin / nitrified cotton-based resin as a main agent is used as a solid content by gravure printing. A moisture-proof sheet in which an adhesion primer layer having an application amount of 5 g / m ² was formed on both surfaces was prepared. The moisture-proof sheet is applied to a 3 mm thick MDF with a vinyl acetate adhesive in a wet state at 8 g / scale ² and dried, and then pasted with a roll laminator so that the PET film surface side of the moisture-proof sheet is positioned on the coated surface. A dressed decorative board was produced.

Applying and drying 3g / m ² of a two-component curable urethane adhesive on the vapor layer surface of a 12μm thick vapor-deposited PET film as a solid, and then applying PE on the coated surface to a thickness of 15μm using a T-die extruder. A laminated body (PET 12 μm / deposition layer / PE 15 μm) was prepared by heat melting and extrusion. After subjecting both exposed surfaces of the laminate to corona discharge treatment, a two-part curable resin in which isocyanate as a curing agent is added to a urethane resin / nitrified cotton-based resin as a main agent is used as a solid content by gravure printing. After forming an adhesion primer layer having a coating amount of 5 g / m ² on both sides, the adhesion primer layer formed on the PE surface is composed of a vehicle in which isocyanate is added as a curing agent to a nitrified cotton-based resin as a main agent. Using a liquid curable printing ink, a solid pattern printing layer is formed by gravure printing, then a pattern printing layer is formed using a printing ink with a nitrified cotton-based resin as a vehicle, and then an acrylic polyol system as the main agent A two-part curable resin in which isocyanate is added as a curing agent to the resin is fixed on the entire surface on which the solid printing layer and the pattern printing layer are formed by the gravure printing method. To prepare a moistureproof sheet to form a surface protective layer by printing so as to 16g / m ² as a minute. The moisture-proof sheet is applied to a 3 mm thick MDF with a vinyl acetate adhesive in a wet state at 8 g / scale ² and dried, and then pasted with a roll laminator so that the PET film surface side of the moisture-proof sheet is positioned on the coated surface. A dressed decorative board was produced.

After the polyvinyl alcohol solution was applied to the vapor-deposited surface of the 12 μm-thick vapor-deposited PET film by a gravure printing method so as to be 0.2 g / m ² after drying, the PET surface was subjected to corona discharge treatment, Adhesion of 2g / m ² with 2g / m ² as solid content by gravure printing method with 2 parts curable resin with isocyanate added as curing agent to urethane resin / nitrified cotton series resin as main agent on each surface of polyvinyl alcohol A moisture-proof sheet in the form of a primer layer was prepared. The moisture-proof sheet was applied to a 3 mm thick MDF with a vinyl acetate adhesive in a wet state at 8 g / scale ² and dried, and then adhered to the coated surface with a roll laminator so that the vapor-deposited side of the moisture-proof sheet was positioned on the coated surface. A decorative veneer was made.

[Comparative Example 1]
23 g / m ² of inter-paper reinforced paper subjected to corona discharge treatment on one side was placed so that the corona discharge treatment surface was opposed, and PE was heated and melted and extruded to a thickness of 40 μm with a T-die extruder, A moisture-proof sheet laminated with a so-called sandwich lamination method (inter-paper reinforced paper 23 g / m ² / PE 40 μm / inter-paper reinforced paper 23 g / m ² ) was produced. The moisture-proof sheet was applied to a 3 mm thick MDF with a vinyl acetate adhesive in a wet state at 8 g / scale ² and dried, and then a decorative board was prepared by adhering to the coated surface with a roll laminator.

[Comparative Example 2]
On one side, 23 g / m ² inter-paper reinforced paper and 30 g / m ² inter-paper reinforced paper that have been subjected to corona discharge treatment are placed with the corona discharge treatment surface facing each other, and PE is 40 μm using a T-die extruder. A laminated body (23 g / m ² paper-reinforced paper / 40 μm PE / 30 μm PE paper / 30 g / m ² paper reinforced paper) laminated by a so-called sandwich lamination method was prepared by heating and extruding to a thickness. Next, gravure printing is performed on the exposed surface of the 30 g / m ² inter-paper reinforced paper of the laminate using a two-component curable printing ink comprising a vehicle in which isocyanate as a curing agent is added to a nitrified cotton-based resin as a main agent. A two-component solution in which a solid print layer is formed by the above method, a pattern print layer is then formed using a printing ink containing a nitrified cotton-based resin as a vehicle, and then an isocyanate is added as a curing agent to an acrylic polyol-based resin as a main agent. A moisture-proof sheet having a surface protective layer formed by printing a curable resin by gravure printing on the entire surface on which the solid print layer and the pattern print layer were formed to a solid content of 16 g / m ² was produced. After the moisture-proof sheet is coated and dried with 8 g / sq. ^{2 of} vinyl acetate adhesive on MDF having a thickness of 3 mm in a wet state, the exposed surface of 23 g / m ² of inter-paper reinforced paper of the moisture-proof sheet is present on the coated surface. A decorative board adhered with a roll laminator so as to be positioned was prepared.

  The decorative plates of Examples 1 to 3 and Comparative Examples 1 and 2 prepared above were evaluated for moisture permeability and plane tensile strength by the following evaluation methods, and the results are summarized in Table 1.

〔Evaluation methods〕
-Moisture permeability: Conforms to JIS Z 0208 "Moisture permeability test method for moisture-proof packaging materials (cup method)"
Then, the moisture permeation was calculated by measuring the moisture-proof sheets of Examples 1 to 3 and Comparative Examples 1 and 2.
Out.
Planar tensile strength: JAS plywood Measured according to the plane tensile test to calculate the plane tensile strength.
In addition, the decorative board used for evaluation calls the moisture-proof sheet and MDF for 24 hours.
Using a pressed material, cut the decorative board into 5cm square and the bottom is 2cm square
A metal jig is attached to the moisture-proof sheet surface with a cyanoacrylate adhesive.
After curing at room temperature (about 23 ° C) for 4 hours, follow the metal jig with a cutter knife.
Make a notch that reaches the MDF,
In contrast, pull in the direction of the vertical plane, and visually observe and evaluate the peeling interface.
And tensile strength was measured.

  As is clear from Table 1, the moisture-proof sheet of the present invention is improved in moisture permeability by providing a silica vapor deposition layer, and the decorative board warpage caused by changes in environmental temperature and humidity is compared with the conventional product. The effect that it can be remarkably reduced can be expected. Further, in the plane tensile strength, since the paper layer is not used for the layer structure, it becomes delamination (material failure = material failure) of the decorative board base material, and the peel strength is improved as compared with the inter-paper peeling.

1 is a layer configuration diagram schematically illustrating a first embodiment of a moisture-proof sheet according to the present invention. It is a layer block diagram which shows 2nd Embodiment of the moisture-proof sheet | seat concerning this invention schematically. It is a layer block diagram which shows schematically 3rd Embodiment of the moisture-proof sheet | seat concerning this invention. It is a layer block diagram showing diagrammatically 4th Embodiment of a moisture-proof sheet concerning the present invention. It is a layer block diagram which shows 5th Embodiment of the moisture-proof sheet | seat concerning this invention schematically. It is a layer block diagram which shows schematically one Example of the decorative board using the moisture-proof sheet | seat of this invention. It is a layer block diagram which shows schematically the other Example of the decorative board using the moisture-proof sheet | seat of this invention.

Explanation of symbols

1 (a) to 1 (e) Moisture-proof sheet 2 (a), 2 (b) Decorative plate 10 Synthetic resin substrate layer 11 Vapor deposition layer 12, 19 Adhesive layer 13 First synthetic resin layer 14 Second synthetic resin layer 15, 16 Primer layer for adhesion 17 Picture printing layer 18 Surface protective layer 20 Base material for decorative plate 30 Cosmetic sheet

Claims (11)

A moisture-proof sheet comprising a synthetic resin substrate layer and a vapor-deposited layer, wherein an adhesion primer layer is provided on the exposed surface of the synthetic resin substrate layer. The moisture-proof sheet according to claim 1, wherein an adhesion primer layer is provided on the exposed surface of the vapor deposition layer. A moisture-proof sheet comprising a base layer made of a synthetic resin and a vapor-deposited layer, wherein a moisture-proof sheet is attached to the exposed surface of the base layer made of synthetic tree via an adhesive layer . The moisture-proof sheet according to claim 3, wherein an adhesion primer layer is provided on the exposed surface of the vapor deposition layer. A decorative board comprising the moisture-proof sheet according to any one of claims 1 and 2 attached to one surface of a decorative board substrate. A decorative board comprising the moisture-proof sheet according to any one of claims 3 and 4 attached to the other surface of the decorative board according to claim 5. A moisture-proof sheet comprising a synthetic resin base material layer, a vapor deposition layer, an adhesive layer, and a first synthetic resin layer, which is bonded to the exposed surfaces of the synthetic resin base material layer and the first synthetic resin layer. A moisture-proof sheet comprising a primer layer. The moisture-proof sheet according to claim 7, wherein a second synthetic resin layer is interposed between the synthetic resin base material layer and the adhesion primer layer. The moisture-proof sheet according to any one of claims 7 and 8, wherein a pattern printing layer and a surface protective layer are formed in this order on the adhesion primer layer surface formed on the first synthetic resin layer surface. A decorative board comprising the moisture-proof sheet according to any one of claims 7 and 8 attached to one surface of a decorative board substrate. A decorative board comprising the moisture-proof sheet according to claim 9 attached to the other surface of the decorative board according to claim 10.

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