JP5251402B2 - Interior decorative material - Google Patents

Description

  The present invention relates to an interior decorative material.

  Conventionally, on walls of houses, commercial facilities, hospitals, nursing homes, etc., on non-flammable boards such as plasterboard, wallpaper, polyester decorative board, wood powder blended PVC, or plywood, particle board, medium density fiber What applied the decorative material which stuck the decorative sheet on the woody base materials, such as a board (MDF), is used. In recent years, as consumer demands have become more severe and diversified, in addition to conventionally required characteristics such as workability and scratch resistance, impact resistance has been demanded. For example, wheelchairs, stretchers for transporting patients, carriers for meals, etc. are used in homes, hospitals, and nursing homes where home care is provided. Damage to the base material such as gypsum board in the lower layer was a problem. Many cosmetic materials excellent in workability, scratch resistance, etc. have been developed so far (see, for example, Patent Document 1), but cosmetic materials used for interiors such as wall surfaces with excellent impact resistance have been developed. The current situation is not enough, and the development of interior decoration materials with excellent impact resistance is desired.

  By the way, with the increase in the demand in the above-mentioned uses, the use conditions are diversified, so that it is expected to be used in a severer environment than before. In particular, in an environment of high temperature and humidity, warping of the interior decorative material is likely to occur, and peeling of the base material and the interior decorative material due to the warpage may cause a problem of poor appearance due to the peeling.

JP 2001-260109 A

  An object of the present invention is to provide an interior decorative material that is excellent in impact resistance under such circumstances and can suppress the occurrence of warpage even under high-temperature and high-humidity conditions.

  As a result of intensive research to achieve the above object, the present inventors have laminated wood fiberboards having different densities, which are excellent in impact resistance and suppress the occurrence of warpage even under high temperature and high humidity conditions. Interior decoration material that can be obtained.

That is, the present invention
(1) On a low density wood fiberboard having a density of less than 0.40 g / cm ² , a high density wood fiberboard having a density of 0.70 g / cm ² or more is laminated. Interior cosmetics,
(2) The interior decorative material according to (1), wherein a high-density wood fiberboard is further laminated on the back surface of the low-density wood fiberboard provided with the high-density wood fiberboard.
(3) The interior decorative material according to (1) or (2), wherein a decorative sheet is laminated on the high-density wooden fiberboard,
(4) The interior decorative material according to (1) or (3), wherein the high-density wood fiberboard is MDF (medium density fiberboard),
(5) The interior decorative material according to (2) or (3), wherein at least one of the high-density wood fiberboard is MDF (medium density fiberboard).
(6) The interior decorative material according to any one of (1) to (5), wherein the low-density wood fiberboard is an insulation board, and (7) the (1) to ( 6) the interior decorative material according to any one of
Is to provide.

  ADVANTAGE OF THE INVENTION According to this invention, it is excellent in impact resistance, generation | occurrence | production of curvature is suppressed also in the condition of high temperature and humidity, and it can provide the interior decoration material used suitably especially for a waist wall.

  An example of a typical structure of the interior decorative material of the present invention will be described with reference to FIGS. FIG. 1 is a schematic view showing a cross section of a preferred example of the interior decorative material 1 of the present invention. In the example shown in FIG. 1, the interior decorative material 1 of the present invention is one in which a low-density wood fiberboard 4, a high-density wood fiberboard 2, and a decorative sheet 5 are sequentially laminated via an adhesive layer. . Moreover, in the example shown by FIG. 2 which is a schematic diagram which shows the cross section of a preferable example of the interior decorative material 1 of the present invention, the interior decorative material 1 of the present invention includes a high-density wood fiber board 21 and a low-density wood fiber. The board 4, the high density wood fiber board 22, and the decorative sheet 5 are sequentially laminated through an adhesive layer. FIG. 3 is a schematic view showing a cross section of an example of use of the interior decorative material 1 of the present invention. The interior decorative material 1 of the present invention is used by being attached to a gypsum board or the like serving as a base material 6.

[High-density wood fiberboard]
The high-density wood fiberboard according to the present invention refers to a wood fiberboard having a density of 0.70 g / m ² or more among fiberboards defined in JIS A5905-2003. The wood fiberboard specified by the above JIS is a board formed mainly from wood and other plant fibers. Generally, the surface hardness is high, and if an appropriate density is selected, a dent when an object collides with it is selected. It is a strong and useful material. In addition, the cost of the material can be obtained at a lower cost than plastic.
Preferred examples of such a high density wood fiberboard include MDF (medium density fiberboard) and hard board. These high-density wood fiberboards are relatively inexpensive, have good surface properties, can be laminated smoothly on decorative sheets, and have good machinability when cut into fixed sizes for construction. Therefore, it is preferable. When using a plurality of high density wood fiberboards, these high density wood fiberboards may be the same or different, but are preferably the same from the viewpoint of reducing warpage.

  The thickness of the high-density wood fiberboard is not particularly limited, but is preferably 1 to 5 mm, more preferably 1.5 to 5 mm, from the viewpoint of manufacturing restrictions and weight of the wood fiberboard. 5 to 3 mm is more preferable. When only a high-density wood fiberboard is used as the interior decorative material, a thickness of 10 mm or more is required to obtain sufficient impact resistance, which results in a heavy article and an expensive material. However, by combining a low-density wood fiberboard with a high-density wood fiberboard, even if the high-density wood fiberboard has the above-mentioned thickness, sufficient impact resistance can be ensured. Costs can be reduced. When two high-density wood fiberboards are used for the interior decorative material of the present invention, the thicknesses of the two high-density wood fiberboards may be the same or different, but are the same from the viewpoint of reducing warpage. Preferably there is.

[Low density wood fiberboard]
The low-density wood fiberboard according to the present invention refers to a wood fiberboard having a density of less than 0.40 g / m ² among fiberboards defined in JIS A5905-2003. Examples of such a low-density wood fiberboard include an insulation board, a tatami board, and a sizing board, and the insulation board is preferable from the viewpoint of reducing warpage.
The thickness of the low-density wood fiberboard is not particularly limited, but is preferably 1 to 5 mm, more preferably 2 to 5 mm, and more preferably 3 to 5 mm from the viewpoints of production restrictions and weight of the wood fiberboard. Further preferred.

[Adhesive layer]
In the interior decorative material of the present invention, an adhesive layer is provided between the high-density wood fiberboard and the low-density wood fiberboard, and between the high-density wood fiberboard and the decorative sheet.
Adhesives used in the adhesive layer include (meth) acrylic resins, polyurethane resins, epoxy resins, polyester resins, polyamide resins, (meth) acrylic ester-olefin copolymer resins, vinyl chloride. -Easy adhesive resins such as vinyl acetate copolymer resins, ethylene-vinyl acetate copolymer resins, ionomer resins, olefin-α olefin copolymer resins, etc. They can be used in combination. Of these, polyurethane resins are preferred because of good initial and long-term adhesion. Here, “(meth) acrylate” means “acrylate or methacrylate”.

  The thickness of the adhesive layer may be an appropriate thickness depending on the required physical properties and the like, but is usually about 1 to 100 μm. The method for forming the adhesive layer is not particularly limited, but usually, known printing or coating means such as gravure printing, roll coating, etc. as an ink or coating liquid comprising a resin liquid obtained by diluting the above resin with a diluent solvent. To form. Further, in the adhesive layer, for the purpose of adjusting and improving various physical properties such as printing (or coating) suitability of the ink (or coating liquid), other auxiliary materials, for example, Various additives such as extender pigments may be added.

  In the interior decorative material of the present invention, a primer layer can be applied in order to improve interlayer adhesion. The primer layer usually has a thickness of 1 to 10 μm, and preferred examples of the resin forming the primer layer include (meth) acrylic resins, polyurethane resins, and urethane-acrylic resins.

[Decorative sheet]
When the interior decorative material of the present invention has two high-density wood fiberboards on the high-density wood fiberboard, a decorative sheet is further laminated on at least one of them for the purpose of imparting design properties. be able to. As a decorative sheet, it can be used without any limitation as long as it can provide design properties, but in order to further impart wear resistance, scratch resistance, stain resistance, etc. to the interior decorative material of the present invention, an overcoat layer is provided. It is preferable to use a decorative sheet. As such a decorative sheet, for example, a coated sheet made of urethane resin or acrylic resin, a decorative sheet provided with a surface protective layer formed by crosslinking and curing an ionizing radiation curable resin composition, and the like can be preferably exemplified. However, a decorative sheet having a surface protective layer formed by crosslinking and curing the ionizing radiation curable resin composition is particularly preferable. As a decorative sheet having a surface protective layer formed by crosslinking and curing such an ionizing radiation curable resin composition, for example, “WS Safmare” (trade name, manufactured by Dai Nippon Printing Co., Ltd.) can be exemplified.

For the purpose of obtaining the beauty of the side of the interior decorative material and preventing warping due to humidity, the decorative sheet is applied to the side surface and the back surface of the laminated base material composed of the high-density wood fiberboard and the low-density wood fiberboard. It is preferable to enclose and stick. For example, when the interior decorative material has a laminated base material having a three-layer structure in which a high-density wood fiberboard, a low-density wood fiberboard, and a high-density wood fiberboard are laminated, The side and back of only the wood fiberboard may be wrapped and pasted, or the side and the back of the high density wood fiberboard and low density wood fiberboard may be wrapped and pasted, or high density The side and back surfaces of the wood fiberboard, the low-density wood fiberboard, and the other high-density wood fiberboard may be rolled in and stuck. Further, when the interior decorative material of the present invention is provided with a moisture-proof sheet on the back surface, the decorative sheet is not particularly limited, but may be attached after the moisture-proof sheet is provided on the laminated base material. As described above, the decorative sheet may be appropriately selected from methods such as two-way winding and four-way winding in order to wrap the decorative sheet around the side surface and the back surface of the laminated base material.
In addition, a primer layer can be provided on the surface of the laminated base material on which the decorative sheet is pasted for the purpose of improving adhesion. The primer layer usually has a thickness of 1 to 15 μm and is preferably formed of a resin such as a (meth) acrylic resin, a polyurethane resin, or a urethane-acrylic resin.

[Dampproof sheet]
The interior decorative material of the present invention is for the purpose of preventing warpage of the interior decorative material due to the ingress of moisture into the laminated base material, and when there are two high-density wood fiber boards in the high-density wood fiber board A moisture-proof sheet can be preferably provided on at least one of them. Moreover, when a decorative sheet is provided, it can be provided on the surface opposite to the decorative sheet.
As the moisture-proof sheet, a sheet having a three-layer structure in which a paper layer is stuck on both sides of a high-density polyethylene resin extrusion coating layer is preferably mentioned (hereinafter referred to as moisture-proof sheet A). Here, the high density polyethylene resin means a polyethylene resin having a density of 0.941 g / m ³ or more, and the low density polyethylene resin means a polyethylene resin having a density of 0.910 to 0.925 g / m ³ . As the paper layer used for the moisture-proof sheet A, the weight of 20 to 50 g / m ² of building paper, pure white paper impregnated with latex or synthetic resin, or synthetic resin is mixed to enhance interlayer strength. Thin paper (so-called inter-paper reinforcing paper) is preferably used. If the weight is 20 to 50 g / m ² , it is not too flexible, so that wrinkles are unlikely to occur during the laminating process, and peeling from the paper layer and moisture do not easily permeate. In addition, it is possible to increase the strength of the interlayer or the interface with high-density polyethylene by using chemical fiber paper, which is commonly called synthetic fiber paper such as rayon nonwoven fabric, for the paper layer on the flame-retardant substrate 2 side. It is.

The moisture-proof high-density polyethylene resin extrusion coating layer desirably has a moisture permeability of 30 g / m ² · 24 hr or less, preferably a moisture permeability of 15 g / m ² · 24 hr or less. As thickness, about 15-30 micrometers is preferable from the point of the rigidity as a moisture-proof sheet, sticking workability | operativity with a paper layer, and material cost. Here, when the polyethylene resin is pasted with the same thickness, when the high density polyethylene resin (density 0.942 g / m ³ ) and the low density polyethylene resin (density 0.924 g / m ³ ) are compared, the moisture permeability is For example, at 15 μm, they are 20 g / m ² · 24 hr and 35 g / m ² · 24 hr, respectively, and at 30 μm, they are 10 g / m ² · 24 hr and 20 g / m ² · 24 hr, respectively. That is, when the high moisture-proof performance of the high-density polyethylene resin is exhibited, or when the moisture-proof performance equivalent to that of the low-density polyethylene resin is sufficient, the film can be made thin, and an inexpensive moisture-proof sheet can be produced.

  The moisture-proof sheet A can be produced by using a method in which a paper layer and a high-density polyethylene resin film are bonded using an adhesive or heat, and the high-density polyethylene resin is formed on two paper layers by an extrusion laminating method. A method of laminating layers at the same time as melt extrusion is mentioned, but when a three-layer structure such as a paper layer / high-density polyethylene resin / paper layer is formed, a method of laminating three layers at a time by the extrusion laminating method is a process. This is the best method because it requires less.

Moreover, as a moisture-proof sheet, what consists of a synthetic resin base material and a vapor deposition layer (henceforth a moisture-proof sheet B) is also used preferably. Examples of the synthetic resin substrate used for the moisture-proof sheet B include a sheet using a resin that forms the resin sheet of the decorative sheet 5 described above. The thickness of the sheet is preferably 5 to 50 μm, more preferably 9 to 30 μm, and still more preferably 9 to 25 μm.
Preferred examples of the vapor deposition layer include an inorganic vapor deposition layer composed of a metal thin film typified by aluminum, or an inorganic oxide vapor deposition layer composed of an inorganic oxide thin film typified by silicon oxide, magnesium oxide, and aluminum oxide. This vapor deposition layer is formed into a thin film on at least one surface of the above-mentioned synthetic resin base material layer by a known vapor deposition method such as a vacuum vapor deposition method or a plasma activated chemical reaction vapor deposition method. In addition, on the vapor deposition layer, a roll coating method is applied to polyvinyl alcohol or a composition in which an inorganic oxide typified by silicon oxide, magnesium oxide or aluminum oxide is added to polyvinyl alcohol or polyvinyl alcohol for the purpose of improving moisture resistance of the moisture-proof sheet. The polyvinyl alcohol layer or the composition layer can be applied and formed by a known coating method such as a gravure coating method.

  The moisture-proof sheet B can have an adhesion primer layer for the purpose of improving the adhesion to the laminated substrate. Examples of the resin forming the primer layer include ester resins, urethane resins, acrylic resins, polycarbonate resins, vinyl chloride-vinyl acetate copolymers, polyvinyl butyral resins, nitrocellulose resins, and the like. The resins can be used alone or in combination. The adhesion primer layer is formed by applying the above-described resin by a coating method such as a roll coating method or a gravure printing method.

  As the resin used for the adhesion primer layer other than those described above, a resin comprising a copolymer (I) of an acrylic resin and a urethane resin and isocyanate (II) is particularly preferable. The copolymer of the copolymer (I) of an acrylic resin and a urethane resin includes an acrylic polymer component (A) having a hydroxyl group at a terminal, a polyester polyol component (B) having a hydroxyl group at both terminals, and a diisocyanate component ( It is obtained by blending and reacting C) to obtain a prepolymer, and adding a chain extender (D) such as diamine to the prepolymer to extend the chain. As a result of this reaction, the copolymer (I) of the resulting acrylic resin and urethane resin forms a polyester urethane, an acrylic polymer component is introduced into the molecule, and an acrylic-polyester urethane having a hydroxyl group at the end. It is a copolymer. The terminal hydroxyl group of the copolymer (I) of the acrylic resin and the urethane resin thus obtained reacts with the isocyanate (II) and cures to form an adhesion primer layer.

The interior decorative material of the present invention is not particularly limited, but is preferably used for applications that require impact resistance in terms of its characteristics. Preferable uses include, for example, interior building materials such as doors, wall boards, floor boards, waist walls, curbs, shelves, door pockets, and furniture uses such as desks and bags. Especially, the interior decoration material of this invention is useful as a waist wall use used for wall surfaces, such as a house, a commercial facility, a hospital, and a nursing care facility. The thickness of the interior decorative material for the waist wall is preferably equal to or less than the protruding width of the door frame from the wall surface. When the width is not more than the protrusion width, impact resistance and warpage are less likely to occur, and the interior decorative material has a good fit and can be finished into a beautiful wall. Generally, the width of the door frame protruding from the wall surface is about 10 mm, and therefore the thickness of the interior decorative material for specific waist wall use is preferably 10 mm or less, more preferably 7 mm or less. In addition, the interior decorative material of the present invention is less likely to be warped in a hot and humid environment as well as in a normal environment. Can be used.
When used as a waist wall, as shown in FIG. 3, the interior decorative material of the present invention includes a plaster board such as a gypsum board and a gypsum slag board, a calcium silicate board, an asbestos slate board, a lightweight foamed concrete board, and a hollow extruded board. It is used by adhering to a base material such as a cement board such as a cement board, a fiber cement board such as a pulp cement board, an asbestos cement board, and a wood chip cement board via an adhesive layer. As the adhesive used for the adhesive layer, a commonly used adhesive can be used without limitation.

EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by this example.
(Evaluation and measurement method)
The decorative interior materials obtained in each Example and the materials used in each Example were evaluated and measured by the following methods.
(1) Measurement of elongation at break The elongation at break of the thermoplastic resin foam plate used in each example was measured according to JIS K7127-1999.
(2) Evaluation of warpage The interior decorative material produced in each example and comparative example was cut into 30 cm × 90 cm, left in a 60 ° C. and 10% environment for one week, and then in a 50 ° C. and 90% environment. Left for a week. The warpage of the 90 cm side of this interior decorative material was measured.
◎ 0 or more and less than 2mm ○ 2mm or more and less than 4mm △ 4mm or more and less than 10mm × 10mm or more (3) Impact resistance evaluation (interior cosmetic material surface)
A test piece impact test was carried out on the test pieces obtained by sticking the interior decorative material produced in each Example and Comparative Example to a gypsum board as a base material according to JIS K7211-1976. An eggplant type weight (an eggplant type 1) was dropped onto an interior decorative material from a height of 75 cm and 1 m, and the surface of the interior decorative material was visually observed and evaluated according to the following criteria.
○ There was no change in the surface. △ Some dents were formed on the surface, but there was no problem in practical use. × Remarkable dents were generated on the surface. (4) Impact resistance evaluation (base material)
The falling weight impact test was performed, and the appearance of the gypsum board as the base material of the interior decorative material was visually observed and evaluated according to the following criteria.
○ There were no cracks. △ Some cracks occurred, but there was no problem in practical use.

Example 1
As a low-density wood fiberboard, an insulation board (Daiken Kogyo Co., Ltd., thickness: 4.0 mm, density: 0.27 g / cm ² ) is used as a high-density wood fiberboard. Product name: NP Wood, manufactured by Sumitomo Forestry Co., Ltd., thickness: 2.5 mm, density: 0.76 g / cm ² , hereinafter referred to as MDF), and olefin sheet (trade name: WS Safmare, Dai Nippon Printing Co., Ltd., thickness: 0.14 mm) was prepared. First, an adhesive mainly composed of a polyurethane resin was applied to MDF at a thickness of 10 μm / dry, and an olefin sheet was adhered. Next, the same adhesive as described above was applied to the low-density wood fiberboard at a thickness of 10 μm / dry, and MDF was stuck to obtain the interior decorative material of the present invention. The obtained interior decorative material was stuck on a gypsum board (trade name: Tiger Board, Yoshino Gypsum Co., Ltd., thickness: 12.5 mm) to obtain a test piece.

Example 2
Insulation board (Daiken Kogyo Co., Ltd., thickness: 4.0 mm, density: 0.27 g / cm ² ) is used as the low-density wood fiberboard, and hardboard (Daiken) as the high-density wood fiberboard. ^Two olefin sheets (trade name: WS Safmare, manufactured by Dai Nippon Printing Co., Ltd., thickness: 0.14 mm) were used as decorative sheets 5 with two sheets manufactured by Kogyo Co., Ltd., thickness: 2 mm, density: 1.01 g / cm ^2. Prepared. First, an adhesive mainly composed of a polyurethane resin was applied to one hard board at a thickness of 10 μm / dry, and an olefin sheet was adhered. Next, the same adhesive as described above was applied to the low-density wood fiberboard at a thickness of 10 μm / dry, and the olefin sheet of the hardboard on which the olefin sheet was adhered was adhered to the outermost surface, Furthermore, an adhesive similar to the above was applied to another hard board at a thickness of 10 μm / dry, and a low-density wood fiberboard was adhered to obtain the interior decorative material of the present invention. The obtained interior decorative material was stuck on a gypsum board (trade name: Tiger Board, Yoshino Gypsum Co., Ltd., thickness: 12.5 mm) to obtain a test piece.

Production Example 1 (Preparation of moisture-proof sheet A)
High density of 0.94 g / cm ³ with a thickness of 40 μm from T-die extruder on paper-reinforced paper (“FIX-30 (trade name)” manufactured by Sanko Paper Co., Ltd.) weighing 20 g / m ² Polyethylene resin is extrusion coated, and at the same time, another sheet of paper-reinforced paper with a weight of 20 g / m ² (manufactured by Sanko Paper Co., Ltd., FIX-30) is laminated and cooled with a chill roll to form two paper layers. A moisture-proof sheet A having a structure was produced.

Production Example 2 (Preparation of moisture-proof sheet B1)
On the surface of the biaxially stretched PET film (“Lumirror (trade name)” manufactured by Toray Industries, Inc., thickness: 12 μm) having a silica vapor deposition layer on one surface, 3 g / two-component curable urethane adhesive is used. It was coated and dried at m ² (based on solid content), and polyethylene was heated and extruded to a thickness of 15 μm with a T-die extruder on the coated surface to produce a laminate (PET / deposition layer / polyethylene). After the corona discharge treatment is applied to both exposed surfaces of this laminate, a two-part curable resin in which isocyanate is added as a curing agent to a urethane resin / nitrified cotton-based resin as a main agent is obtained by gravure printing at 5 g / m ² (solid The moisture-proof sheet B1 was produced by applying the adhesive primer layer on both sides.

Production Example 3 (Preparation of moisture-proof sheet B2)
On the surface of the biaxially stretched PET film (“Lumirror (trade name)” manufactured by Toray Industries, Inc., thickness: 12 μm) provided with a silica vapor deposition layer on one surface, 0.2 g / m after drying the polyvinyl alcohol solution. After applying by gravure printing so that it becomes ² , the other surface is subjected to corona discharge treatment, and the hardened agent is urethane resin // nitrified cotton-based resin as the main agent on the coated surface of the polyvinyl alcohol solution and the corona discharge treated surface. As a moisture-proof sheet B2 having a primer layer for adhesion formed on both sides was applied by gravure printing with a two-component curable resin added with isocyanate as 2 g / m ² (based on solids).

Example 3
Insulation board (Daiken Kogyo Co., Ltd., thickness: 4.0 mm, density: 0.27 g / cm ² ) is used as the low-density wood fiberboard, and hardboard (Daiken) as the high-density wood fiberboard. ^Two olefin sheets (trade name: WS Safmare, manufactured by Dai Nippon Printing Co., Ltd., thickness: 0.14 mm) were used as decorative sheets 5 with two sheets manufactured by Kogyo Co., Ltd., thickness: 2 mm, density: 1.01 g / cm ^2. Prepared. First, an adhesive mainly composed of a polyurethane resin is applied to a low-density wood fiberboard at a thickness of 10 μm / dry, and the hardboard olefin sheet is pasted so that the olefin sheet is the outermost surface. Further, the same adhesive as described above was applied to another hard board at a thickness of 10 μm / dry, and a low-density wood fiberboard was adhered to obtain a three-layer laminated substrate. . Next, an adhesive mainly composed of a polyurethane resin was applied at a thickness of 10 μm / dry on the surface of one of the high-density wood fiberboards of the obtained laminated substrate, and the moisture-proof obtained in Production Example 1 The sheet A is attached, and the other high-density wood fiberboard is coated with a resin composition (a mixture of a urethane resin (EX-9) and an acrylic resin (SA-95). 100: 10 EX-9 and SA-95 are both manufactured by Chuo Rika Kogyo Co., Ltd.) to a thickness of 11 μm and dried, and then urethane resin is applied to the olefin sheet. The adhesive as a main component was applied at a thickness of 10 μm / dry and adhered to the laminated base material to obtain the interior decorative material of the present invention. The obtained interior decorative material was stuck on a gypsum board (trade name: Tiger Board, Yoshino Gypsum Co., Ltd., thickness: 12.5 mm) to obtain a test piece.

Example 4
In Example 3, an interior decorative material and a test piece were obtained in the same manner as in Example 3 except that the olefin sheet was attached by two-way winding to wind up to the opposite two back surfaces of the laminated base material.

Examples 5 and 6
In Example 3, Example 5 and Example are the same as Example 3 except that the moisture-proof sheet A is the moisture-proof sheet B1 obtained in Production Example 2 and the moisture-proof sheet B2 obtained in Production Example 3, respectively. 6 interior decorative materials and test pieces were obtained.

Comparative Example 1
In Example 1, an interior decorative material and a test piece were obtained in the same manner as in Example 1 except that the insulation board was not used and the thickness of the MDF was 9 mm.

Comparative Example 2
Wallpaper (made by Toli Co., Ltd., thickness: 1 mm) was stuck on a gypsum board (trade name: Tiger Board, Yoshino Gypsum Co., Ltd., thickness: 12.5 mm) to obtain a test piece. The warpage was evaluated using wallpaper.

Comparative Example 3
A polyester decorative board (manufactured by Aika Kogyo Co., Ltd., thickness: 2.5 mm) was attached to a gypsum board (trade name: Tiger Board, Yoshino Gypsum Co., Ltd., thickness: 12.5 mm) to obtain a test piece. The warpage was evaluated using a polyester decorative board.

Comparative Example 4
A wood powder blended PVC sheet (thickness: 2.5 mm) was adhered to a gypsum board (trade name: Tiger Board, Yoshino Gypsum Co., Ltd., thickness: 12.5 mm) to obtain a test piece. In addition, evaluation of curvature was performed with the wood powder combination PVC sheet.

Reference example 1
In Example 1, an interior decorative material and a test piece were obtained in the same manner as in Example 1 except that the insulation board was not used and the thickness of the MDF was set to 12 mm.

Table 1 shows the results of the above evaluations on Examples 1 to 6, Comparative Examples 1 to 4, and Reference Example 1.
The interior decorative material obtained in Example 1 showed high performance in all respects, and the interior decorative material obtained in Example 2 was further improved in warpage evaluation as compared to Example 1. The interior decorative material obtained in Examples 3, 5 and 6 provided with the moisture-proof sheet is further excellent in warpage evaluation, and the interior cosmetic obtained in Example 4 in which the decorative sheet is stuck in two-way winding. In addition to the evaluation of warpage, the material was a decorative material with excellent side aesthetics. Moreover, in Comparative Examples 1-4, although evaluation of curvature was favorable, it was inadequate at the point of the surface dent and the crack of a gypsum board. Reference Example 1 is an example in which the thermoplastic fiber foam board is not used and the wood fiber board is thickened, and the impact resistance is sufficiently evaluated. However, the thickness of the wood fiber board is required to be 12 mm. It was heavy and was not sufficient for practical use.

  ADVANTAGE OF THE INVENTION According to this invention, it is excellent in impact resistance, generation | occurrence | production of curvature is suppressed also in the conditions of high temperature and humidity, and the interior decoration material used suitably especially for a waist wall can be obtained.

It is a schematic diagram which shows the cross section of the interior decorative material of this invention. It is a schematic diagram which shows the cross section of the interior decorative material of this invention. It is a schematic diagram which shows the cross section of the usage example of the interior decorative material of this invention.

Explanation of symbols

1. Interior decorative material 2. High density wood fiberboard 21. High density wood fiberboard 22. High density wood fiberboard 31. Adhesive layer 32. Adhesive layer 33. Adhesive layer 34. Adhesive layer 4. 4. Low density wood fiberboard Decorative sheet Base material

Claims (8)

On the low density wood fiber board having a density of less than 0.40 g / cm ³ , a high density wood fiber board having a density of 0.70 g / cm ³ or more is laminated , the rear surface having a high-density wood fiber board density wood fiberboard, made by further laminating a high density wood fiber board, and that at least moisture-proof sheet on one of the high density wood fiber board is provided Interior decorative material. The interior decorative material according to claim 1, wherein the moisture-proof sheet is a moisture-proof sheet having paper layers on both sides of an extrusion coating layer of a high-density polyethylene resin, or a moisture-proof sheet comprising a synthetic resin substrate and a vapor deposition layer.   The interior decorative material according to claim 1 or 2, wherein a decorative sheet is laminated on the high-density wood fiberboard. The interior decorative material according to any one of claims 1 to 3, wherein the two high-density wood fiberboards are the same. The interior decorative material according to any one of claims 1 to 4, wherein the high-density wood fiberboard is MDF (medium density fiberboard). The interior decorative material according to any one of claims 1 to 3, wherein at least one of the high-density wood fiberboard is MDF (medium density fiberboard). The interior decorative material according to any one of claims 1 to 6 , wherein the low-density wood fiberboard is an insulation board. The interior decorative material according to any one of claims 1 to 7 , which is used for a waist wall.

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