JP2017080909A - Moistureproof sheet for housing material and decorative plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moistureproof sheet for housing material which suppresses warpage of a decorative plate against an influence by a temperature of an environment and a change of humidity even when applied to a fitting such as a door panel, and can keep adhesiveness to a base material.SOLUTION: There is provided a moistureproof sheet 1 for housing material which has a base material layer 2 made from a transparent synthetic resin, a vapor-deposited layer 3 that is formed on one surface side of the base material layer 2 and is made from an inorganic oxide, and primer layers 5 and 6 for adhesion on each of the other surface of the base material layer 2 and the surface of the vapor-deposited layer 3, where water vapor permeation of the whole sheet is 1.0 g/mday or less, and the moisture proof sheet has such transparency that the sheet back side can be visually recognized from the sheet surface side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a moisture-proof sheet for building materials to be attached to a wooden base material that constitutes a building material such as a door panel and other building materials, and a decorative board having the moisture-proof sheet.

For decorative panels such as indoor door panels, the surface of the wood-based substrate that constitutes the decorative plate is used to prevent substrate warpage caused by moisture absorption and desorption due to changes in temperature and humidity in the room atmosphere. In some cases, a moisture-proof sheet is attached to the surface.
In other words, the decorative board improves the solid printing layer and design for providing concealment to the surface of woody base materials such as plywood, medium density fiberboard (MDF), veneer board, board material, and other multilayer structures. It is configured by pasting together a decorative sheet on which a pattern-like layer is printed. And these decorative boards are known to be coated with a paint or a moisture-proof sheet on the surface of a wooden base material in order to prevent deformation (warping, dimensional change) due to temperature and humidity. (Patent Document 1).

  However, the material used for the moisture-proof sheet having adhesion to the various decorative panels and moisture-proofing is sufficient to simply apply an adhesive between them or to perform an adhesive treatment on the interface. Sex was not expected. In particular, sufficient adhesiveness could not be maintained if it was required to withstand the effects of temperature and humidity changes as described above.

Japanese Patent No. 4946350

  The present invention is directed to a moisture-proof sheet that can suppress the warping of the decorative plate and maintain the adhesion to the base material against the influence of changes in environmental temperature and humidity even when applied to a fitting such as a door panel.

In order to solve the problem, a moisture-proof sheet for building materials according to one aspect of the present invention is a vapor deposition composed of a base layer made of a transparent synthetic resin and an inorganic oxide formed on one surface side of the base layer. And a primer layer for adhesion provided on the vapor deposition layer and on the other surface of the base material layer, and the water vapor permeability of the entire sheet is 1.0 g / m ² · day or less. And having transparency that allows the sheet rear surface side to be visually recognized from the sheet front surface side.

According to the moisture-proof sheet which is an aspect of the present invention, the water vapor permeability is 1.0 g / m ² · day or less by having a base layer and a vapor deposition layer made of a synthetic resin having a predetermined thickness. The decorative board using the moisture-proof sheet which is an aspect of the present invention has a moisture-proof performance, and even if it is used in a place where there is a large difference in the temperature and humidity environment on both sides, such as a door, a sliding door, and a partition, There is an excellent effect that there is almost no warping.
Moreover, the decorative board using the moisture-proof sheet according to the embodiment of the present invention can be used for a long period of time, and can maintain sufficient adhesiveness.
Furthermore, by having transparency that can be visually recognized, it becomes possible to confirm cracks of the substrate even after the moisture-proof sheet is attached.

It is sectional drawing which shows the structural example of the moisture-proof sheet | seat which concerns on embodiment based on this invention. It is sectional drawing which shows the decorative board which concerns on embodiment based on this invention.

Next, embodiments of the present invention will be described with reference to the drawings.
Here, the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Further, the embodiment described below exemplifies a configuration for embodying the technical idea of the present invention, and the technical idea of the present invention is that the material, shape, structure, etc. of the component parts are as follows. It is not something specific. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

As shown in FIG. 1, the moisture-proof sheet 1 for building materials according to the present embodiment has a vapor-deposited layer 3 made of an inorganic oxide formed on the surface of a transparent base material layer 2, and both the front and back surfaces of the moisture-proof sheet 1. Transparent primer layers 5 and 6 are formed on the front surface of the vapor deposition layer 3 and the back surface of the base material layer 2, respectively. Here, the transparency refers to a degree of transparency that allows the back to be visually recognized from the front, and refers to a transparency that allows the back side to be visually recognized from the front side to the entire moisture-proof sheet 1.
Moreover, the moisture-proof sheet 1 has a water vapor permeability of 1.0 g / m ² · day or less of the entire sheet.

For example, the base material layer 2 is a transparent biaxially stretched polyethylene terephthalate film having a thickness of 12 μm. In addition, the vapor deposition layer 3 is formed using aluminum oxide by a vacuum vapor deposition method, and as a heating means of the vacuum vapor deposition method, a thickness of 150 nm is formed by an electron beam heating method. At that time, in order to improve the adhesion between the vapor deposition layer 3 and the base material layer 2 and the denseness of the vapor deposition layer 3, the plasma assist method is used to increase the transparency of the vapor deposition film. Gas is blown and reactive deposition is performed. By the above processing, it is possible to produce a moisture-proof sheet for building materials having a water vapor permeability of 1.0 g / m ² · day or less and transparency that allows the sheet rear surface to be visually recognized from the sheet surface side.

  The material of the transparent synthetic resin base material layer 2 includes olefin-based thermoplastic resins such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl alcohol copolymer, or a mixture thereof, polyethylene terephthalate, poly Ester-based thermoplastic resins such as butylene terephthalate, polyethylene naphthalate, polyethylene naphthalate-isophthalate copolymer, polycarbonate, polyarylate, acrylic heat such as polymethyl methacrylate, polyethyl methacrylate, polybutyl acrylate Non-halogen thermoplastic resins such as a plastic resin, polyimide, polyurethane, polystyrene, acrylonitrile-butadiene-styrene resin, and the like can be given.

The base material layer 2 may be a sheet stretched in a uniaxial or biaxial direction or may be unstretched. However, the vapor deposition layer 3 described later is a base material on which at least one surface is formed. A sheet stretched in the biaxial direction is preferable for reasons such as high mechanical strength and excellent dimensional stability. The thickness of the base material layer 2 is, for example, in the range of 9 to 100 μm. For example, the base material layer 2 is preferably a biaxially stretched polyethylene terephthalate film, and the film constituting the base material layer 2 is transparent.
The vapor deposition layer 3 is made of an inorganic oxide thin film typified by silicon oxide, magnesium oxide, and aluminum oxide.

Here, although the vapor deposition layer 3 made of an inorganic material made of a metal thin film typified by aluminum has a metallic luster, the inorganic oxide vapor deposition layer 3 becomes a transparent vapor deposition film as in this embodiment.
The optimum thickness of the vapor deposition layer 3 varies depending on the type and configuration of the inorganic compound used, but is generally within the range of 5 to 300 nm, and the value is appropriately selected. However, if the film thickness 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 1 may not be sufficiently achieved. Further, when the film thickness exceeds 300 nm, the flexibility cannot be maintained due to the residual stress of the thin film, and there is a problem because the thin film may be cracked due to external factors after film formation. More preferably, it is in the range of 10 to 150 nm.

  As a method of laminating the vapor deposition layer 3 on the base material layer 2, vacuum vapor deposition, sputtering, ion plating, plasma vapor deposition (CVD), or the like can be used. However, in consideration of productivity, the vacuum deposition method is the best. As the heating means of the vacuum evaporation method, it is preferable to use any one of an electron beam heating method, a resistance heating method, and an induction heating method. It is more preferable to use the method. Moreover, in order to improve the adhesiveness of the vapor deposition layer 3 and the base material layer 2, and the denseness of the vapor deposition layer 3, it is also possible to vapor-deposit using a plasma assist method or an ion beam assist method. In order to increase the transparency of the deposited film, it is possible to use reactive deposition in which various gases such as oxygen are blown during the deposition.

The adhesion primer layers 5 and 6 are provided to improve adhesion to the wood base material of the decorative board and the decorative sheet 11, and specifically include ester resins, urethane resins, and acrylic resins. , Polycarbonate resin, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral resin, nitrocellulose resin, and the like. These resins can be used alone or mixed to form an adhesive composition, which can be used for roll coating or gravure printing. It can be formed using an appropriate coating means such as a method.
The primer constituting the adhesion primer layers 5 and 6 is preferably a urethane-acrylate resin, that is, particularly preferably formed of a resin composed of a copolymer of an acrylic resin and a urethane resin and an isocyanate. That is, a copolymer of an acrylic resin and a urethane resin contains 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). Thus, a prepolymer is obtained by reaction, 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. The acrylic-polyester urethane copolymer is formed by reacting the terminal hydroxyl group with an isocyanate 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. . Component A is an acrylic resin component in the copolymer, and those having a molecular weight of 5000 to 7000 (weight average molecular weight) are preferably used because of particularly good weather resistance and adhesiveness. In addition, component A may be used only having hydroxyl groups at both ends, or a component having a conjugated double bond remaining at one end may be mixed with one having hydroxyl groups at both ends. It ’s good.

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

  The urethane resin component formed by the reaction of the component B and the component C gives flexibility to the adhesion primer layers 5 and 6 and contributes to improvement in adhesion. The acrylic resin component made of an acrylic polymer contributes to the weather resistance and blocking resistance of the adhesion primer layers 5 and 6. 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 primer layers 5 and 6 is obtained, and adipic acid or a mixture of adipic acid and terephthalic acid In the case of polyester diol composed of 3-methylpentanediol and 1,4-cyclohexanedimethanol, 500 to 5000 (weight average molecular weight) is preferable.

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

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

Addition of isocyanate to acrylic-polyester urethane copolymer, coating method, coating solution adjusted to necessary viscosity in consideration of coating amount after drying, known coating methods such as gravure coating method, roll coating method, etc. It is only necessary to form the primer layers 5 and 6 for adhesion by applying the coating. The isocyanate is not particularly limited as long as it can react with the hydroxyl group of the acrylic-polyester urethane copolymer and can be crosslinked and cured. For example, divalent or higher aliphatic or aromatic isocyanates can be used. Aliphatic isocyanates are desirable from the viewpoint of discoloration prevention and weather resistance. Specifically, a monomer such as tolylene diisocyanate, xylylene diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, lysine diisocyanate, or a multimer such as a dimer or trimer thereof, or And polyisocyanates such as derivatives (adducts) obtained by adding these isocyanates to polyols.
The coating amount after drying of the adhesion primer layers 5 and 6 is 1 to 20 g / m ² , preferably 1 to 5 g / m ² . The adhesion primer layers 5 and 6 may be layers to which additives such as silica powder, additives such as a light stabilizer and a colorant are added as necessary.

Next, an example of a decorative board using the moisture-proof sheet 1 of the present embodiment will be described.
Although this embodiment demonstrates as an example the case where it applies to the door panel which is a fitting as a decorative board. It is not limited to this. You may apply to decorative panels, such as a floor panel.
As shown in FIG. 2, the door panel is formed by laminating the building material moisture-proof sheet 1 of this embodiment and the decorative sheet 11 in this order on both surfaces of a core material 10 using a wood-based base material. .
Examples of the wood base material include plywood, particle board, medium density fiber board (MDF), and high density fiber board (HDF).

As an adhesive at the time of affixing, any type of adhesives, such as a thermoplastic resin type, a thermosetting resin type, and a rubber (elastomer) type, may be used, for example. 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-based adhesives include natural rubber, recycled rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, butyl rubber, polysulfide rubber, silicone rubber, polyurethane rubber, stereo rubber (synthetic natural rubber), ethylene propylene rubber, block Examples include copolymer rubber (SBS, SIS, SEBS, etc.).
The decorative sheet 11 is configured, for example, by laminating a thermoplastic resin layer, a pattern layer, and a surface protective layer in this order. However, the layer configuration of the decorative sheet 11 is not limited to this, and a known decorative sheet 11 can be used as appropriate.

Next, the present invention will be described in more detail with reference to the following examples.
<Example 1>
A vapor deposition layer 3 made of silicon oxide was formed on the surface of the base material layer 2 using a PET film made of a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm as the base material layer 2.
Moreover, the back surface of the base material layer 2 is subjected to corona discharge treatment (adhesion assisting treatment), and a urethane resin / nitrified cotton-based resin as a main agent and an isocyanate as a hardener on each of the corona discharge treatment surface and the surface of the vapor deposition layer 3. Adhesive primer layers 5 and 6 having a coating amount of 1 g / m ² as a solid content were formed by a gravure printing method using a two-component curable resin to which is added.
After the moisture-proof sheet 1 prepared as described above is applied to a 6 mm thick MDF with 8 g / m ^{2 of} vinyl acetate adhesive in a wet state and dried, the roll is formed so that the vapor-deposited side of the moisture-proof sheet 1 is positioned on the coated surface. A decorative board of Example 1 adhered by a laminating machine was produced.

<Example 2>
A vapor deposition layer 3 made of silicon oxide was formed on the surface of the base material layer 2 using a vapor deposition PET film having a thickness of 12 μm as the base material layer 2.
Moreover, the back surface of the base material layer 2 is subjected to a corona discharge treatment (adhesion auxiliary treatment), and a urethane resin / vinyl chloride resin as a main agent is used as a curing agent on each of the corona discharge treatment surface and the surface of the vapor deposition layer 3. Primer layers 5 and 6 for adhesion having a coating amount of 2 g / m ² as a solid content were formed by a gravure printing method using a two-component curable resin to which isocyanate was added.
After the moisture-proof sheet 1 prepared as described above is applied to a 6 mm thick MDF with 8 g / m ^{2 of} vinyl acetate adhesive in a wet state and dried, the roll is formed so that the vapor-deposited side of the moisture-proof sheet 1 is positioned on the coated surface. A decorative board of Example 2 adhered by a laminating machine was produced.

<Comparative Example 1>
23 g / m ² 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, the laminated moistureproof sheet 1 (paper reinforcing sheet interval ^23g / m 2 / ^PE40μm / inter-sheet reinforced paper 23 g / ^{m 2)} was produced in the so-called sandwich lamination method.
The moisture-proof sheet 1 was coated with 8 g / m ^{2 of} vinyl acetate adhesive in a wet state on MDF having a thickness of 3 mm and dried, and then a decorative board was prepared by sticking to the coated surface with a roll laminator.

<Evaluation>
About the decorative board of Examples 1 and 2 produced above, and the comparative example 1, water vapor permeability, plane tensile strength, and transparency were evaluated. The results are summarized in Table 1.
Water vapor transmission rate: The water vapor transmission rate was calculated by measuring the moisture-proof sheet 1 of Example 1 and Comparative Examples 1 and 2 in accordance with JIS Z 0208 “Moisture permeability test method for moisture-proof packaging material (cup method)”. did. The unit of water vapor permeability is g / m ² · day.
-Plane tensile strength: JAS plywood Measured according to the plane tensile test to calculate the plane tensile strength. The unit of plane tensile strength is N / cm ² .
The decorative board used for the evaluation was a moisture-proof sheet 1 and MDF cold-pressed for 24 hours. The decorative board was cut into 5 cm square, and a metal jig with a base of 2 cm square was attached to the moisture-proof sheet 1 surface with cyanoacrylate. After sticking with an adhesive and curing at room temperature (about 23 ° C) for 24 hours, cut with a cutter knife up to the MDF along the metal jig, and in the direction perpendicular to the test piece with the measuring test equipment The tensile strength was measured while the tensile interface was evaluated by visually observing the peeling interface.

-Transparency: The tester confirmed whether the surface of MDF which is a base material can be confirmed by visual recognition of each decorative board.
The evaluation was conducted using the following indicators.
The surface of the MDF is not visible: ×
The surface grain of the MDF can be confirmed: Δ
The surface grain of the MDF can be clearly confirmed: ○

As is clear from Table 1, the moisture-proof sheet 1 of the present invention has an improved water vapor permeability as compared with the prior art, and can significantly reduce the warpage of the decorative board caused by changes in the temperature and humidity of the atmosphere. I understand that I can do it.
Further, in the plane tensile strength, since the paper layer is not used for the layer structure, the delamination of the base material for the decorative board causes material destruction, and the peel strength is improved as compared with the inter-paper peel.
Moreover, since there is a predetermined transparency, it is possible to easily confirm the presence or absence of cracks in the wooden base material.

DESCRIPTION OF SYMBOLS 1 Moisture-proof sheet | seat for building materials 2 Base material layer 3 Vapor deposition layer 5, 6 Primer layer 10 for adhesion | attachment Core material 11 Cosmetic sheet

Claims (2)

A base material layer made of a transparent synthetic resin,
A vapor deposition layer made of an inorganic oxide formed on one surface side of the base material layer;
An adhesion primer layer provided on the vapor deposition layer and on the other surface of the base material layer,
The water vapor permeability of the entire sheet is 1.0 g / m ² · day or less,
And the moisture-proof sheet for building materials which has transparency which the sheet | seat back surface side can visually recognize from the sheet | seat surface side.   A decorative board, wherein the moisture-proof sheet for building materials according to claim 1 is attached to a surface of a wooden base material.

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