WO2010104158A1 - Decorative material for flooring - Google Patents

Decorative material for flooring Download PDF

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Publication number
WO2010104158A1
WO2010104158A1 PCT/JP2010/054144 JP2010054144W WO2010104158A1 WO 2010104158 A1 WO2010104158 A1 WO 2010104158A1 JP 2010054144 W JP2010054144 W JP 2010054144W WO 2010104158 A1 WO2010104158 A1 WO 2010104158A1
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WO
WIPO (PCT)
Prior art keywords
moisture
layer
base material
proof film
floor
Prior art date
Application number
PCT/JP2010/054144
Other languages
French (fr)
Japanese (ja)
Inventor
賢 木村
孝志 土井
寛章 中山
Original Assignee
大日本印刷株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 大日本印刷株式会社 filed Critical 大日本印刷株式会社
Priority to KR1020117021208A priority Critical patent/KR101256317B1/en
Priority to CN201080010899.5A priority patent/CN102341554B/en
Publication of WO2010104158A1 publication Critical patent/WO2010104158A1/en
Priority to HK12107200.7A priority patent/HK1166516A1/en

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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04FFINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00Flooring
    • E04F15/02Flooring or floor layers composed of a number of similar elements
    • E04F15/04Flooring or floor layers composed of a number of similar elements only of wood or with a top layer of wood, e.g. with wooden or metal connecting members
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/04Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B21/08Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04FFINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00Flooring
    • E04F15/02Flooring or floor layers composed of a number of similar elements
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04FFINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00Flooring
    • E04F15/02Flooring or floor layers composed of a number of similar elements
    • E04F15/10Flooring or floor layers composed of a number of similar elements of other materials, e.g. fibrous or chipped materials, organic plastics, magnesite tiles, hardboard, or with a top layer of other materials

Definitions

  • the present invention relates to a flooring material in which warping and curving are suppressed.
  • a wood-based decorative board used as a decorative material for a floor of a house, it has a natural wood design via an adhesive on the upper surface of a wooden base material (for example, hardwood lauan plywood) obtained from a good quality log.
  • a wooden base material for example, hardwood lauan plywood
  • the above-mentioned hardwood lauan is frequently used, but in recent years, raw materials are difficult to obtain due to lack of natural resources, timber cutting restrictions, etc., and the material shortage is progressing. This problem is particularly acute for hardwoods such as Lauan. Therefore, the development of a wood base material that can be used in place of the Lauan plywood is being promoted.
  • Lawan alternative materials include softwood plywood, wood fiber separated from wood-based waste wood, or wood board obtained by molding and solidifying wood fragments with an adhesive (for example, medium density wood fiber board: MDF, high density wood fiber board) : HDF, particle board: PB), there is an early-wood plywood made of early-wood.
  • these lauan alternative materials have a problem that the dimensional change amount per 1% moisture content change is larger than that of lauan plywood, and the dimensional change is easy according to the change of the surrounding environment.
  • the dimensional change per 1% moisture content of Lauan plywood is 0.015 to 0.02%, but about 0.045% for MDF and PB, and 0 for softwood plywood (for example, Radiata Pine). It is about 0.025%.
  • the Lawan alternative material has a characteristic that warp and bend (the right angle of the floor surface shifts) easily occur due to changes in humidity.
  • Patent Documents 1 to 3 In order to improve the above problem, it has been proposed to laminate a moisture-proof sheet on the back surface of the Lawan alternative material (for example, Patent Documents 1 to 3).
  • the moisture-proof sheets described in Patent Documents 1 to 3 have a moisture permeability of about 20 g / m 2 ⁇ 24 hours at the most, and the performance is insufficient to prevent warping and bending of the Lauan alternative material.
  • a decorative sheet having a low water vapor transmission rate (2 g / m 2 ⁇ 24 hours or less) is often laminated on the front surface of the Lawan alternative material, so that the water vapor transmission rate on the back surface is equal to or higher than that of the front surface. There is a need to reduce moisture permeability.
  • the present invention uses a Lauan alternative material whose dimensional change per 1% moisture content change is larger than 0.02% as a wooden base material, and even when a decorative sheet with low moisture permeability is laminated on the front surface.
  • An object of the present invention is to provide a floor decorative material in which the occurrence of warping and curving is suppressed.
  • the present inventor has found that the above object can be achieved when a specific moisture-proof film is used, and has completed the present invention.
  • the present invention relates to the following floor decorative material.
  • a decorative sheet for flooring in which a decorative sheet is laminated on the front surface of the wooden substrate, and a moisture-proof film is laminated on the back surface of the wooden substrate, (1)
  • the wooden base material has a dimensional change per 1% moisture content change larger than 0.02%, (2)
  • the moisture-proof film has a moisture permeability of 7 g / m 2 ⁇ 24 hours or less. 2.
  • a decorative sheet for flooring in which a decorative sheet is laminated on the front surface of the wooden substrate, and a moisture-proof film is laminated on the back surface of the wooden substrate, (1)
  • the wooden base material has a dimensional change per 1% moisture content change larger than 0.02%
  • the moisture-proof film has a moisture permeability of 7 g / m 2 ⁇ 24 hours or less
  • the wood base material has an average moisture content of 6 to 10% by weight, and a moisture content in a central part is in a range of -1% to + 2% as compared with a moisture content in a peripheral part.
  • the wood substrate is at least one selected from the group consisting of medium density wood fiber board (MDF), high density wood fiber board (HDF), particle board (PB), softwood plywood, and early-wood plywood, Item 3.
  • MDF medium density wood fiber board
  • HDF high density wood fiber board
  • PB particle board
  • softwood plywood and early-wood plywood
  • Item 3. A floor decorative material according to Item 1 or 2. 4).
  • Item 3. The floor decorative material according to Item 1 or 2, wherein the moisture-proof film has at least a synthetic resin base material layer and a vapor deposition layer. 5).
  • Item 5 The floor decorative material according to Item 4, wherein the moisture-proof film has a primer layer between the synthetic resin substrate layer and the vapor deposition layer. 6).
  • the floor decorative material according to Item 4, wherein the moisture-proof film is composed of the synthetic resin base layer / primer layer / deposition layer / surface coat layer. 7). Item 5.
  • the floor decorative material according to Item 4 further comprising a primer layer on one or both surfaces of the moisture-proof film. 8).
  • Item 3. The floor decorative material according to Item 1 or 2, wherein the decorative sheet and the moisture-proof film are laminated on the wooden substrate with an adhesive.
  • Item 3. The floor decorative material according to Item 1 or 2, which is a flooring material for floor heating.
  • the flooring decorative material of the present invention is a flooring decorative material in which a decorative sheet is laminated on the front surface of a wooden substrate, and a moisture-proof film is laminated on the back surface of the wooden substrate, (1)
  • the wooden base material has a dimensional change per 1% moisture content change larger than 0.02%
  • the moisture-proof film has a moisture permeability of 7 g / m 2 ⁇ 24 hours or less.
  • the moisture permeability is a measured value in an environment of a temperature of 40 ° C. and a humidity of 90% RH according to JIS Z0208 (moisture permeability test method (cup method)).
  • the moisture permeability in the present specification indicates a measured value under the conditions.
  • the floor decorative material of the present invention having the above characteristics has a moisture-proof film having a moisture permeability of 7 g / m 2 ⁇ 24 hours or less, so that the moisture permeability of the back surface of the wooden substrate is kept low. Therefore, even when a laminating substitute material with a dimensional change per 1% moisture content change larger than 0.02% is used as a wooden base material and a decorative sheet with low moisture permeability is laminated on the front surface, the wooden base Since the moisture permeability of the front surface and the back surface of the material can be set to the same level, the occurrence of warping and bending of the floor decorative material is sufficiently suppressed.
  • Such a flooring material of the present invention is suitable as a flooring material to be constructed on the floor surface of various buildings and as a flooring material used for floor heating as a special application.
  • a Lawan alternative material is used as the woody base material of the present invention.
  • it is a material that replaces the conventional lauan plywood and the like, for example, at least one of medium density wood fiber board (MDF), high density wood fiber board (HDF), particle board (PB), softwood plywood, early-wood plywood, etc.
  • MDF medium density wood fiber board
  • HDF high density wood fiber board
  • PB particle board
  • softwood plywood early-wood plywood, etc.
  • Examples of early mature trees include poplar, falkata, acacia, chamelere, eucalyptus, terminaria and the like.
  • These Lauan alternative materials have a dimensional change per 1% moisture content change greater than 0.02%.
  • the “dimensional change per 1% water content” in the present specification is a dimensional change measured by the following procedure. (1) Prepare a test piece of wood base material cut to 300 mm ⁇ 303 mm. (2) In a normal temperature (25 ° C.) environment, the current dimensions (length of four sides) of the test piece are measured with a caliper. (3) The test piece is left in a 40 ° C. oven (humidity free, dry atmosphere ⁇ 0%) for one week. (4) After one week, the weight and dimensions (length of four sides) of the test piece are measured. (5) The dimensional change rate per 1% moisture content change is measured from the measurement data of both conditions.
  • the thickness of the wooden substrate is not particularly limited, but is preferably about 2 to 15 mm, more preferably about 2 to 12 mm.
  • the wood substrate in preparation for the case where the flooring decorative material is cut and used depending on the construction site, has an average moisture content of 6 to 10% by weight and a central moisture content of the peripheral portion. It is preferable to use a wooden substrate having a range of -1% to + 2% compared to the moisture content.
  • the size of the wood base material is, for example, about 150 mm long ⁇ 1840 mm wide (especially, the length of the short side is 200 mm or less), the warp or curl due to the deviation of the moisture content between the central part and the peripheral part of the wooden base material Is likely to occur.
  • the moisture content characteristic of the wooden base material it is possible to suppress the occurrence of warping and curving even when the floor decorative material is cut and used.
  • the decorative material for floors specifically, a case where the floor decorative material is applied to a corner portion of a room where the decorative material for flooring is applied (by the wall or around the pillar) is assumed.
  • the average moisture content of the wooden base material is preferably 6 to 10% by weight, and more preferably 6.5 to 8% by weight. If the average moisture content is within the above range, it is easy to suppress the occurrence of curving and warping after cutting. Among them, when the floor decorative material is used for floor heating, the average moisture content is preferably set to 6 to 9% by weight.
  • the moisture content of the wood substrate is preferably in the range of -1% to + 2%, more preferably in the range of -0.5% to + 1%, compared to the moisture content in the central part. Is more preferable.
  • the peripheral part of a wooden base material means the range of 5 cm around a wooden base material
  • the center part of a wooden base material means the inside of the wooden base material except the said peripheral part.
  • moisture content difference in the present specification indicates the moisture content difference between the peripheral portion and the central portion of the wood substrate
  • moisture content difference is measured by the following procedure. Is the value to be (A) As shown in FIG. 3, a woody base material having a length of 303 mm and a width of 1818 mm is prepared. (B) A range of 5 cm from the periphery of the wooden base material is defined as the peripheral portion, and the inside thereof is defined as the central portion. As shown by 1 to 35 in FIG. 3, 35 samples of 5 cm ⁇ 5 cm are collected evenly, and the water content is measured by a total dry method. The all-dry method is a method in which each sample is left in an oven at 105 ° C.
  • the decorative sheet is laminated on the front surface of the wooden substrate.
  • the decorative sheet preferably has a moisture permeability of 7 g / m 2 ⁇ 24 hours or less at a temperature of 40 ° C. and a humidity of 90%, more preferably 5 g / m 2 ⁇ 24 hours or less.
  • the structure of the decorative sheet is not limited, but for example, a decorative sheet having a pattern layer (solid ink layer / pattern ink layer), a transparent resin layer, and a surface protective layer in order on the base sheet is preferable.
  • this decorative sheet will be exemplarily described.
  • the base sheet is 1) paper such as thin paper, fine paper, kraft paper, Japanese paper, titanium paper, resin-impregnated paper, inter-paper reinforced paper, etc. 2) wood fiber, glass fiber, asbestos, polyester fiber, vinylon fiber, rayon Examples thereof include one or two or more laminates of woven or non-woven fabric made of fibers and the like, and 3) sheets of synthetic resin such as polyolefin, polyester, polyacryl, polyamide, polyurethane, and polystyrene.
  • the thickness of the base sheet is preferably about 20 to 300 ⁇ m.
  • the substrate sheet may be colored as necessary. Further, the surface may be subjected to surface treatment such as corona discharge treatment, plasma treatment, or ozone treatment.
  • the pattern layer is composed of a pattern ink layer and / or a solid ink layer.
  • the pattern layer can be formed by a printing method such as gravure printing, offset printing or silk screen printing. Examples of the pattern of the pattern ink layer include a wood grain pattern, a stone pattern, a cloth pattern, a skin pattern, a geometric pattern, characters, symbols, line drawings, various abstract patterns, and the like.
  • the solid ink layer is obtained by solid printing of colored ink.
  • the pattern layer is composed of one or both of a pattern ink layer and a solid ink layer.
  • chlorinated polyolefin such as chlorinated polyethylene and chlorinated polypropylene
  • polyester polyurethane comprising isocyanate and polyol
  • polyacryl polyvinyl acetate, polyvinyl chloride, and vinyl chloride-vinyl acetate
  • a polymer, a cellulose-based resin, a polyamide-based resin, or the like may be used alone or in combination, and a pigment, a solvent, various auxiliary agents, and the like may be added thereto to make an ink.
  • polyester polyurethane composed of isocyanate and polyol, polyacryl, polyamide-based resin, and the like is preferable.
  • the transparent resin layer is not particularly limited as long as it is a transparent resin layer.
  • the transparent resin layer can be suitably formed of a transparent thermoplastic resin.
  • polymers, ionomers, acrylic esters, and methacrylic esters include polymers, ionomers, acrylic esters, and methacrylic esters.
  • polyolefin resins such as polypropylene are preferable.
  • the transparent resin layer may be colored.
  • a colorant may be added to the thermoplastic resin.
  • pigments or dyes used in the picture layer can be used.
  • fillers for the transparent resin layer, fillers, matting agents, foaming agents, flame retardants, lubricants, antistatic agents, antioxidants, UV absorbers, light stabilizers, radical scavengers, soft components (eg rubber)
  • Various additives such as may be included.
  • the surface protective layer (transparent surface protective layer) is provided for imparting surface physical properties such as scratch resistance, abrasion resistance, water resistance and stain resistance required for the decorative sheet.
  • a curable resin such as a thermosetting resin or an ionizing radiation curable resin is preferable.
  • ionizing radiation curable resins are preferable from the viewpoint of high surface hardness, productivity, and the like.
  • thermosetting resins include unsaturated polyester resins, polyurethane resins (including two-component curable polyurethane), epoxy resins, amino alkyd resins, phenol resins, urea resins, diallyl phthalate resins, melamine resins, guanamine resins, and melamines.
  • unsaturated polyester resins polyurethane resins (including two-component curable polyurethane)
  • epoxy resins include epoxy resins, amino alkyd resins, phenol resins, urea resins, diallyl phthalate resins, melamine resins, guanamine resins, and melamines.
  • -Urea cocondensation resin silicon resin, polysiloxane resin and the like.
  • a curing agent such as a crosslinking agent and a polymerization initiator and a polymerization accelerator can be added to the resin.
  • curing agents isocyanates, organic sulfonates, etc. can be added to unsaturated polyester resins, polyurethane resins, etc., organic amines, etc. can be added to epoxy resins, peroxides such as methyl ethyl ketone peroxide, azoisobutyl nitrile, etc.
  • a radical initiator can be added to the unsaturated polyester resin.
  • Examples of the method for forming the surface protective layer with a thermosetting resin include a method in which a solution of a thermosetting resin is applied by a coating method such as a roll coating method or a gravure coating method and then dried and cured.
  • the coating amount of the solution is about 5 to 30 ⁇ m, preferably about 5 to 20 ⁇ m in terms of solid content.
  • the ionizing radiation curable resin is not limited as long as it is a resin that undergoes a crosslinking polymerization reaction upon irradiation with ionizing radiation and changes to a three-dimensional polymer structure.
  • one or more prepolymers, oligomers and monomers having a polymerizable unsaturated bond or epoxy group that can be crosslinked by irradiation with ionizing radiation in the molecule can be used.
  • examples thereof include acrylate resins such as urethane acrylate, polyester acrylate, and epoxy acrylate; silicon resins such as siloxane; polyester resins; epoxy resins and the like.
  • Ionizing radiation includes visible light, ultraviolet light (near ultraviolet light, vacuum ultraviolet light, etc.), X-rays, electron beams, ion beams, etc. Among them, ultraviolet light and electron beams are preferable.
  • an ultra-high pressure mercury lamp As the ultraviolet light source, an ultra-high pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc lamp, a black light fluorescent lamp, or a metal halide lamp can be used.
  • the wavelength of ultraviolet light is about 190 to 380 nm.
  • the electron beam source for example, various electron beam accelerators such as a cockcroft-wald type, a bandegraft type, a resonant transformer type, an insulating core transformer type, a linear type, a dynamitron type, and a high frequency type can be used.
  • the energy of the electron beam is preferably about 100 to 1000 keV, more preferably about 100 to 300 keV.
  • the irradiation amount of the electron beam is preferably about 2 to 15 Mrad.
  • the ionizing radiation curable resin is sufficiently cured when irradiated with an electron beam, but it is preferable to add a photopolymerization initiator (sensitizer) when cured by irradiation with ultraviolet rays.
  • a photopolymerization initiator sensitizer
  • Photopolymerization initiators in the case of resin systems having radically polymerizable unsaturated groups include, for example, acetophenones, benzophenones, thioxanthones, benzoin, benzoin methyl ether, Michler benzoylbenzoate, Michler ketone, diphenyl sulfide, dibenzyl disulfide , Diethyl oxide, triphenylbiimidazole, isopropyl-N, N-dimethylaminobenzoate and the like can be used.
  • a resin system having a cationic polymerizable functional group for example, at least one kind such as an aromatic diazonium salt, an aromatic sulfonium salt, a metallocene compound, a benzoin sulfonic acid ester, and a freeloxysulfoxonium diallyl iodosyl salt.
  • an aromatic diazonium salt an aromatic sulfonium salt, a metallocene compound, a benzoin sulfonic acid ester, and a freeloxysulfoxonium diallyl iodosyl salt.
  • the addition amount of the photopolymerization initiator is not particularly limited, but is generally about 0.1 to 10 parts by weight with respect to 100 parts by weight of the ionizing radiation curable resin.
  • a solution of an ionizing radiation curable resin may be applied by a coating method such as a gravure coating method or a roll coating method.
  • the coating amount of the solution is about 5 to 30 ⁇ m, preferably about 5 to 20 ⁇ m as a solid content.
  • an inorganic filler may be blended.
  • inorganic fillers include powdered aluminum oxide, silicon carbide, silicon dioxide, calcium titanate, barium titanate, magnesium pyroborate, zinc oxide, silicon nitride, zirconium oxide, chromium oxide, iron oxide, boron nitride, Examples include diamond, gold sand and glass fiber.
  • the amount of the inorganic filler added is about 1 to 80 parts by weight with respect to 100 parts by weight of the ionizing radiation curable resin.
  • Lamination of each layer is, for example, by forming a pattern layer (solid ink layer, pattern ink layer) on one side of the base sheet by printing in order, and then bonding a known dry lamination such as a two-component curable urethane resin on the pattern layer.
  • a transparent resin layer can be laminated by a dry lamination method, a T-die extrusion method or the like via an agent, and a surface protective layer can be formed.
  • An uneven pattern may be formed by embossing from the surface protective layer side.
  • the concavo-convex pattern can be formed by heating press, hairline processing or the like.
  • Examples of the uneven pattern include a conduit groove, a stone plate surface unevenness, a cloth surface texture, a satin finish, a grain, a hairline, and a line groove.
  • the decorative sheet may have a synthetic resin layer (so-called backer layer) having a thickness of 100 ⁇ m or more in the lowermost layer (layer that adheres to the wooden substrate).
  • a backer layer means the buffer layer aiming at shock absorption etc. in the decorative material for floors.
  • the material constituting the backer layer examples include polypropylene, ethylene-vinyl alcohol copolymer, polymethylene, polymethylpentene, polyethylene terephthalate, and high heat-resistant polyalkylene terephthalate [for example, a part of ethylene glycol is 1,4- Polyethylene terephthalate substituted with cyclohexanedimethanol, diethylene glycol, etc., so-called trade name PET-G (manufactured by Eastman Chemical Company)], polybutylene terephthalate, polyethylene naphthalate, polyethylene naphthalate-isophthalate copolymer, polycarbonate, poly Examples include arylate, polyimide, polystyrene, polyamide, and ABS. These resins can be used alone or in combination of two or more.
  • the upper limit of the thickness of the backer layer is not limited, but 600 ⁇ m is appropriate.
  • a known adhesive When laminating the decorative sheet on the wooden base material, a known adhesive can be used.
  • the adhesive include polyvinyl acetate, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ionomer, butadiene / acrylonitrile rubber, neoprene rubber, natural rubber, and the like as active ingredients. Adhesives to be used.
  • the thickness of the adhesive layer is not limited, but is preferably about 0.1 to 50 ⁇ m.
  • the moisture-proof film is provided on the back surface of the wooden substrate.
  • a moisture-proof film having a moisture permeability of 7 g / m 2 ⁇ 24 hours or less at a temperature of 40 ° C. and a humidity of 90% is used.
  • the moisture permeability is preferably 5 g / m 2 ⁇ 24 hours or less.
  • the moisture-proof film is not limited as long as the above moisture permeability is satisfied.
  • a synthetic resin film such as an olefin-based thermoplastic resin such as polyethylene or polypropylene, or an ester-based thermoplastic resin such as polyethylene terephthalate, polybutylene terephthalate, or polyethylene naphthalate is used.
  • an olefin-based thermoplastic resin such as polyethylene or polypropylene
  • an ester-based thermoplastic resin such as polyethylene terephthalate, polybutylene terephthalate, or polyethylene naphthalate
  • those having at least a synthetic resin base material layer and a vapor deposition layer are particularly preferable.
  • this aspect will be described by way of example.
  • Synthetic resin substrate layers include polyethylene, polypropylene, ethylene-propylene copolymers, ethylene-vinyl alcohol copolymers, olefinic thermoplastic resins such as mixtures thereof; polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, Ester thermoplastic resins such as polyethylene naphthalate-isophthalate copolymer, polycarbonate and polyarylate; Acrylic thermoplastic resins such as methyl polymethacrylate, ethyl polymethacrylate, polybutyl acrylate; polyimide, polyurethane, Non-halogen thermoplastic resins such as polystyrene and acrylonitrile-butadiene-styrene resin can be used.
  • the synthetic resin base material layer may be a sheet stretched in a uniaxial or biaxial direction, or may be unstretched. It is preferable that the synthetic resin base material layer is further laminated with a vapor deposition layer. From the positioning as the base material on which the vapor deposition layer is formed, the mechanical strength is strong and the dimensional stability is biaxial. The sheet
  • the vapor deposition layer examples include an inorganic vapor deposition layer composed of a metal thin film typified by aluminum, and an inorganic oxide vapor deposition layer composed of an inorganic oxide thin film typified by silicon oxide, magnesium oxide, and aluminum oxide.
  • the vapor deposition layer is formed on the 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. More preferably, it is an inorganic oxide vapor deposition layer whose vapor deposition layer is transparent.
  • a surface coat layer may be provided on the vapor deposition layer.
  • the surface coat layer include polyvinyl alcohol resins.
  • general formula R 1 n M (OR 2 ) m (wherein R 1 and R 2 represent an organic group having 1 to 8 carbon atoms, M represents a metal atom, and n represents an integer of 0 or more) M represents an integer of 1 or more, and n + m represents a valence of M), and a polyvinyl alcohol resin and / or an ethylene / vinyl alcohol copolymer.
  • compositions prepared by polycondensation by a sol-gel method in the presence of a sol-gel method catalyst, an acid, water and an organic solvent can be mentioned. Further, by combining polyvinyl alcohol and an ethylene / vinyl alcohol copolymer, gas barrier properties, water resistance, weather resistance and the like are remarkably improved. A silane coupling agent or the like may be added to the composition.
  • a surface coat layer is obtained by applying these resins or compositions on the vapor deposition layer by a known coating method such as a roll coating method or a gravure coating method. The surface coat layer also functions as a protective layer for the vapor deposition layer, and a thickness of about 1 to 10 ⁇ m is appropriate.
  • the base layer made of synthetic resin and / or the surface coat layer can be subjected to surface treatment such as corona treatment as necessary. By such surface treatment, the adhesive strength with the adjacent layer can be further increased.
  • a primer layer may be further provided between the synthetic resin base material layer and the vapor deposition layer and on one side or both sides of the moisture-proof film. Therefore, a suitable aspect of the moisture-proof film is, for example, an aspect of “synthetic resin substrate layer / primer layer / deposition layer / surface coat layer”, and further provided with a primer layer on one or both sides of the moisture-proof film. An aspect may be sufficient.
  • These primer layers are provided in order to increase the adhesion between the synthetic resin base material layer and the vapor deposition layer and to increase the adhesion when the moisture-proof film is laminated on another layer.
  • the resin used for such a primer layer examples include ester resins, urethane resins, acrylic resins, polycarbonate resins, vinyl chloride-vinyl acetate copolymers, polyvinyl butyral resins, nitrocellulose resins, and the like. These resins can be used alone or in combination.
  • the primer layer can be formed using an appropriate application means such as a roll coating method or a gravure printing method.
  • the primer layer is preferably formed from (i) a copolymer of an acrylic resin and a urethane resin and (ii) an isocyanate. That is, the copolymer of (i) an acrylic resin and a urethane resin is composed of 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.
  • a chain extender component D
  • 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.
  • component A a linear acrylate polymer having a hydroxyl group at the terminal is used.
  • linear polymethyl methacrylate (PMMA) having a hydroxyl group at the terminal is preferable because it is excellent in weather resistance (particularly, characteristics against photodegradation) and can be easily copolymerized with urethane.
  • Component A is an acrylic resin component in the copolymer, and a component having a molecular weight of 5000 to 7000 (weight average molecular weight) is preferably used because of particularly good weather resistance and adhesiveness.
  • 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. Also good.
  • the 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.
  • 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.
  • diol examples 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.
  • dibasic acid examples include adipic acid, phthalic acid, isophthalic acid, terephthalic acid and the like.
  • polyester polyol is adipic acid using adipic acid or a mixture of adipic acid and terephthalic acid as the acid component, particularly preferably adipic acid, and 3-methylpentenediol and 1,4-cyclohexanedimethanol as the diol component. Polyester.
  • the urethane resin component formed by the reaction of the component B and the component C gives flexibility to the primer layer and contributes to an improvement in adhesion.
  • the acrylic resin component which consists of an acrylic polymer contributes to a weather resistance and blocking resistance in the said primer layer.
  • 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 layer is obtained.
  • Adipic acid or a mixture of adipic acid and terephthalic acid, and 3-methylpentanediol In the case of polyester diol composed of 1,4-cyclohexanedimethanol, 500 to 5000 (weight average molecular weight) is preferable.
  • an aliphatic or alicyclic diisocyanate compound having two isocyanate groups in one molecule is used.
  • 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.
  • isophorone diisocyanate is preferable in terms of physical properties and cost.
  • the equivalent ratio of the total hydroxyl group (may be an amino group) of the acrylic polymer, polyester polyol and chain extender described below to the isocyanate group is such that the isocyanate group becomes excessive.
  • 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 diisocyanate is added to the terminal hydroxyl group is also mixed, and a prepolymer is formed in a state where excess isocyanate group and hydroxyl group remain.
  • 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.
  • the primer layer may be formed by coating by a known coating method such as a coating method.
  • the isocyanate of (ii) is not limited as long as it can react with the hydroxyl group of the acrylic-polyester urethane copolymer of (i) and can be crosslinked and cured.
  • An aliphatic isocyanate can be used, and an aliphatic isocyanate is particularly desirable from the viewpoint of thermal discoloration prevention and weather resistance.
  • tolylene diisocyanate xylylene diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, lysine diisocyanate monomers, dimers, trimers and other multimers, or these
  • polyisocyanates such as derivatives (adducts) obtained by adding the above isocyanate to a polyol.
  • the coating amount of the primer layer after drying is 1 to 20 g / m 2 , preferably 1 to 5 g / m 2 .
  • the said primer layer is good also as a layer which added additives, such as fillers, such as a silica powder, a light stabilizer, and a coloring agent, as needed.
  • a known adhesive When laminating the moisture-proof sheet on a wooden substrate, a known adhesive can be used.
  • the adhesive include polyvinyl acetate, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ionomer, butadiene / acrylonitrile rubber, neoprene rubber, natural rubber, and the like as active ingredients. Adhesives to be used.
  • the thickness of the adhesive layer is not limited, but is preferably about 0.1 to 50 ⁇ m.
  • the floor decorative material of the present invention has a moisture-proof film having a moisture permeability of 7 g / m 2 ⁇ 24 hours or less, the moisture permeability of the back surface of the wooden substrate is suppressed to a low level. Therefore, even when a laminating substitute material with a dimensional change per 1% moisture content change larger than 0.02% is used as a wooden base material and a decorative sheet with low moisture permeability is laminated on the front surface, the wooden base Since the moisture permeability of the front surface and the back surface of the material can be set to the same level, the occurrence of warping and bending of the floor decorative material is sufficiently suppressed.
  • a flooring material of the present invention is suitable as a flooring material to be constructed on the floor surface of various buildings and as a flooring material used for floor heating as a special application.
  • FIG. 1 It is a schematic diagram (an example) of the decorative material for floors of the present invention. It is a schematic diagram which shows the curvature and curving of the decorative material for floors. It is a figure which shows the sample used for the measurement of the average moisture content of a wooden base material, and a moisture content difference. It is a schematic diagram of floor heating system test standard II.
  • Example 1 A decorative sheet (0.4 mm) containing a synthetic resin layer is used to make a 5.5 mm thick MDF (woody base material) using an adhesive (BA-10L / BA-11B, 9 g / scale angle) manufactured by Chuo Rika Kogyo. Affixed to the front surface. The dimensional change rate per 1% change in moisture content of the MDF was 0.05%. In addition, the ergonal angle indicates the area of a plane represented by 303 mm in length ⁇ 303 mm in width (the same applies hereinafter). (2) A moisture-proof film was bonded to the back surface of the MDF using an adhesive (BA-10L / BA-11B, 9 g / scale angle) manufactured by Chuo Rika Kogyo.
  • the laminate in this state is referred to as a decorative board.
  • the decorative board was cut into a size of 313 mm long ⁇ 1840 mm wide with a gang saw.
  • sag processing, end chamfering processing and V-groove processing were performed.
  • a paint was applied to the sanitized part, the end chamfered part, and the V-grooved part on the coating line (paint: a paint containing a two-component curable urethane resin).
  • the floor decorative material was produced through the above steps.
  • the production of the moisture-proof film was as follows. That is, a biaxially stretched polyethylene terephthalate film having a thickness of 12 ⁇ m was prepared, and a primer layer made of a two-component curable urethane resin was provided on one side. Furthermore, the aluminum vapor deposition layer was provided on the primer layer. The film thus obtained is referred to as “deposited PET film”.
  • a 0.2 g / m 2 (dry state) surface coat layer made of PVA / silicate system is formed on the deposited PET film, and a laminate (synthetic resin substrate layer (PET) / deposition layer / surface coat layer) is formed.
  • PET synthetic resin substrate layer
  • a laminate synthetic resin substrate layer (PET) / deposition layer / surface coat layer
  • the adhesive primer layer was formed on both sides by applying at a coating amount of / m 2 .
  • a moisture-proof film moisture permeability of 1 g / m 2 ⁇ 24 hours
  • Example 2 A floor decorative material was prepared in the same manner as in Example 1 except that a 9 mm thick particle board (0.09% dimensional change per 1% moisture content change) was used as the wooden substrate.
  • Example 3 A flooring decorative material was produced in the same manner as in Example 1 except that 12 mm thick softwood plywood (radiata pine, dimensional change rate per 1% moisture content change was 0.026%) was used as the wooden substrate.
  • Example 4 A flooring decorative material was prepared in the same manner as in Example 1 except that PE (polyethylene sheet, moisture permeability 7 g / m 2 ⁇ 24 hours) was used as the moisture-proof film.
  • PE polyethylene sheet, moisture permeability 7 g / m 2 ⁇ 24 hours
  • Comparative Example 1 A flooring decorative material was prepared in the same manner as in Example 1 except that the moisture-proof film was not used.
  • Comparative Example 2 A flooring decorative material was produced in the same manner as in Example 2 except that the moisture-proof film was not used.
  • Comparative Example 3 A flooring decorative material was prepared in the same manner as in Example 3 except that the moisture-proof film was not used.
  • Comparative Example 4 A floor decorative material was prepared in the same manner as in Example 1 except that a moisture-proof paper (polyethylene as a core layer and laminated on both sides with paper. Moisture permeability of 10 g / m 2 ⁇ 24 hours) was used as the moisture-proof film. .
  • a moisture-proof paper polyethylene as a core layer and laminated on both sides with paper. Moisture permeability of 10 g / m 2 ⁇ 24 hours
  • Example 1 A floor decorative material is produced in the same manner as in Example 1 except that a 12 mm thick lauan plywood (a dimensional change rate per 1% moisture content change is 0.016%) is used as a wooden substrate, and a moisture-proof film is not used. did.
  • Test example 1 (warp and bend in a 40 ° C atmosphere)
  • the floor decorative materials produced in Examples 1 to 4, Comparative Examples 1 to 4 and Conventional Example 1 are left in a 40 ° C. atmosphere (dry atmosphere) (for 7 days) to warp and curl the floor decorative material.
  • a 40 ° C. atmosphere dry atmosphere
  • Fig. 2 shows a schematic diagram of the amount of warpage and the amount of bending.
  • the amount of warpage and the amount of bending were measured with a gap gauge.
  • a warp amount of 20 mm / 1840 mm (a warp amount with respect to the horizontal length) or less is acceptable (suitable for practical use).
  • a bending curve of 0.3 mm / 1840 mm (a bending curve with respect to the horizontal length) or less is acceptable (suitable for practical use).
  • Table 1 The results are shown in Table 1.
  • Test example 2 (warp and bend in a 40 ° C., 90% RH atmosphere)
  • the floor decorative materials produced in the examples and comparative examples were left in an atmosphere of 40 ° C. and 90% RH (for 7 days), and the amount of warping and bending of the floor decorative material was measured in the same manner as in Test Example 1. .
  • the results are shown in Table 1.
  • the floor decorative material of the present invention provided with a moisture-proof film having a moisture permeability of 7 g / m 2 ⁇ 24 hours or less is a dimension due to the humidity of the wooden substrate due to the presence of the moisture-proof film. Changes are effectively suppressed. As a result, warping and curving of the floor decorative material are prevented, and the test results of Conventional Example 1 (using Lauan plywood) are closer.
  • Example 5 (1) Floor decorative sheet (0.16mm thickness, water vapor transmission rate: 3g / m 2 ⁇ 24 hours) is 12mm thick using Chuo Rika Industries adhesive (BA-10L / BA-11B, 9g / scale angle)
  • the particle board (PB) woody base material
  • the dimensional change rate per 1% moisture content change of the PB was 0.045%, and the average moisture content was 6.5% by weight.
  • the laminate in this state is referred to as a decorative board.
  • the decorative board was cut into a size of 313 mm long ⁇ 1840 mm wide with a gang saw.
  • sag processing, end chamfering processing and V-groove processing were performed.
  • a paint was applied to the sanitized part, the end chamfered part, and the V-grooved part on the coating line (paint: a paint containing a two-component curable urethane resin).
  • the floor decorative material was produced through the above steps.
  • the decorative board was wrapped in PP film (30 micrometers thickness, water vapor transmission rate 15g), and the moisture-proof process was carried out.
  • Example 6 A flooring decorative material was produced in the same manner as in Example 5 except that the moisture-proof treatment using the PP film was not performed between the steps. Thereby, the moisture content of the peripheral part of a wooden base material was made higher than the center part.
  • Example 7 A flooring decorative material was prepared in the same manner as in Example 5 except that a PB base material having a moisture content of 2% higher than that of the peripheral part was used in the central part of the wooden base material.
  • Example 8 A flooring decorative material was prepared in the same manner as in Example 5 except that a softwood plywood having a moisture content of 1.7% higher than that of the peripheral part was used in the central part of the wooden substrate.
  • Comparative Example 5 A flooring decorative material was produced in the same manner as in Example 6 except that PB having an average moisture content of 5.5% was used as the wooden substrate.
  • Comparative Example 6 A flooring decorative material was produced in the same manner as in Example 6 except that after tenon processing, the sample was left for one week without being subjected to moisture-proof treatment.
  • Comparative Example 7 A flooring decorative material was produced in the same manner as in Example 5 except that a PB base material having a moisture content of 2.5% higher than that of the peripheral part was used.
  • Comparative Example 8 A floor decorative material was prepared in the same manner as in Example 5 except that the average moisture content was adjusted to 10.5% and a PB base material having a moisture content at the center of the wood of 1.3% lower than the peripheral portion was used.
  • Test Example 3 Evaluation of bendability and construction suitability after cutting a flooring decorative material
  • ⁇ Evaluation of amount of curving after cutting> The floor decorative material (313 mm long ⁇ 1840 mm wide) produced in Examples 5 to 8 and Comparative Examples 5 to 8 was cut into about half (150 mm long ⁇ 1840 mm wide) at the center.
  • the amount of lateral bending of the cut flooring was measured using a straight ruler and a gap gauge. The measurement was performed within 30 minutes after cutting.
  • the amount of bending the state where each sane side (male sane, female sane) is convex is defined as + display.
  • the amount of bending after cutting is allowable in the range of “-1.0mm / width 1840mm to + 0.7mm / width 1840mm”.
  • Test example 4 floor heating system test
  • the floor decorative materials (313 mm long ⁇ 1840 mm wide) produced in Examples 5 to 8 and Comparative Examples 5 to 8 were subjected to a floor heating system test.
  • the floor heating system is generally not installed at the corners of the room (by the walls or around the columns), but at the center of the room excluding the corners. Therefore, in Test Example 4, a floor heating system test was performed on a floor decorative material (length 313 mm ⁇ width 1840 mm).
  • the average moisture content is particularly 6 to 10% by weight, and the moisture content in the central part is in the range of -1% to + 2% compared to the moisture content in the peripheral part.
  • the woody base material it is possible to effectively suppress the bending after cutting.
  • the floor decorative material of the present invention can be put to practical use as a floor heating floor material when the moisture permeability of the moisture-proof film is 7 g / m 2 ⁇ 24 hours or less.

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  • Civil Engineering (AREA)
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Abstract

Provided is a decorative material for flooring having a reduced occurrence of curving and warping, even when a lauan substitute with a dimensional change rate greater than 0.02% per percent change in moisture content is used as a wooden base material and a decorative sheet with low permeability is layered on the front surface thereof. Specifically, disclosed is a decorative material for flooring which has a decorative sheet layered on the front surface of a wooden base material and a moisture-resistant film layered on the back surface of the wooden base material, and which is characterised by 1) a wooden base material with a dimensional change rate greater than 0.02% per percent change in moisture content, and 2) a moisture-resistant film with a permeability of no more than 7g/m2·24hrs.

Description

床用化粧材Floor decorative material
 本発明は、反りや曳き曲がりが抑制された床用化粧材に関する。 The present invention relates to a flooring material in which warping and curving are suppressed.
 従来、家屋の床用化粧材として用いられる木質系化粧板としては、良質な原木から得られる木質基材(例えば、広葉樹のラワン合板)の上面に接着剤を介して、天然木の意匠を有する化粧シートを貼着したものが知られている。 Conventionally, as a wood-based decorative board used as a decorative material for a floor of a house, it has a natural wood design via an adhesive on the upper surface of a wooden base material (for example, hardwood lauan plywood) obtained from a good quality log. The thing which stuck the decorative sheet is known.
 木質基材としては、上記広葉樹のラワンが多用されているが、近年、天然資源の窮乏、木材伐採制限等により原木が入手し難く、材料不足が進んでいる。この問題は、特にラワン等の広葉樹にとって深刻である。そのため、ラワン合板に代えて使用できる木質基材の開発が進められている。ラワン代替材料としては、例えば、針葉樹合板、木質系廃材から分離した木質繊維又は木質片を接着剤により成形・固化してなる木質板(例えば、中密度木質繊維板:MDF、高密度木質繊維板:HDF、パーティクルボード:PB)、早成樹からなる早成樹合板がある。 As the woody base material, the above-mentioned hardwood lauan is frequently used, but in recent years, raw materials are difficult to obtain due to lack of natural resources, timber cutting restrictions, etc., and the material shortage is progressing. This problem is particularly acute for hardwoods such as Lauan. Therefore, the development of a wood base material that can be used in place of the Lauan plywood is being promoted. Examples of Lawan alternative materials include softwood plywood, wood fiber separated from wood-based waste wood, or wood board obtained by molding and solidifying wood fragments with an adhesive (for example, medium density wood fiber board: MDF, high density wood fiber board) : HDF, particle board: PB), there is an early-wood plywood made of early-wood.
 しかしながら、これらのラワン代替材料は、ラワン合板と比べて1%含水率変化当たりの寸法変化量が大きく、周囲環境の変化に応じて寸法変化し易いという問題がある。具体的には、ラワン合板の1%含水率当たりの寸法変化量は0.015~0.02%であるが、MDFやPBでは0.045%程度、針葉樹合板(例えば、ラジアータパイン)では0.025%程度である。そのため、ラワン代替材料は、湿度変化によって反りや曳き曲がり(床面の直角がずれる)が発生し易い特性がある。 However, these lauan alternative materials have a problem that the dimensional change amount per 1% moisture content change is larger than that of lauan plywood, and the dimensional change is easy according to the change of the surrounding environment. Specifically, the dimensional change per 1% moisture content of Lauan plywood is 0.015 to 0.02%, but about 0.045% for MDF and PB, and 0 for softwood plywood (for example, Radiata Pine). It is about 0.025%. For this reason, the Lawan alternative material has a characteristic that warp and bend (the right angle of the floor surface shifts) easily occur due to changes in humidity.
 上記問題を改善するために、ラワン代替材料の裏面に防湿シートを積層することが提案されている(例えば、特許文献1~3)。しかしながら、特許文献1~3に記載の防湿シートは透湿度がせいぜい20g/m・24時間程度であり、ラワン代替材料の反りや曳き曲がりを防止するには性能が不十分である。特に近年では、ラワン代替材料のおもて面に透湿度が低い(2g/m・24時間以下)化粧シートを積層する場合が多いため、裏面の透湿度をおもて面と同等又はより透湿度を下げることが求められている。 In order to improve the above problem, it has been proposed to laminate a moisture-proof sheet on the back surface of the Lawan alternative material (for example, Patent Documents 1 to 3). However, the moisture-proof sheets described in Patent Documents 1 to 3 have a moisture permeability of about 20 g / m 2 · 24 hours at the most, and the performance is insufficient to prevent warping and bending of the Lauan alternative material. In recent years, in particular, a decorative sheet having a low water vapor transmission rate (2 g / m 2 · 24 hours or less) is often laminated on the front surface of the Lawan alternative material, so that the water vapor transmission rate on the back surface is equal to or higher than that of the front surface. There is a need to reduce moisture permeability.
 以上より、木質基材として1%含水率変化当たりの寸法変化量が0.02%よりも大きいラワン代替材料を使用し、そのおもて面に透湿性の低い化粧シートを積層した場合でも、反りや曳き曲がりの発生が抑制された床用化粧材の開発が望まれている。 From the above, even when a lauan substitute material having a dimensional change per 1% moisture content change larger than 0.02% is used as a wooden base material and a decorative sheet with low moisture permeability is laminated on the front surface, Development of a decorative material for floors in which the occurrence of warping and curving is suppressed is desired.
特開2001-193267号公報JP 2001-193267 A 特開2001-260109号公報JP 2001-260109 A 特開2006-097321号公報JP 2006-097321 A
 本発明は、木質基材として1%含水率変化当たりの寸法変化量が0.02%よりも大きいラワン代替材料を使用し、そのおもて面に透湿性の低い化粧シートを積層した場合でも、反りや曳き曲がりの発生が抑制された床用化粧材を提供することを目的とする。 The present invention uses a Lauan alternative material whose dimensional change per 1% moisture content change is larger than 0.02% as a wooden base material, and even when a decorative sheet with low moisture permeability is laminated on the front surface. An object of the present invention is to provide a floor decorative material in which the occurrence of warping and curving is suppressed.
 本発明者は、鋭意研究を重ねた結果、特定の防湿フィルムを用いる場合には上記目的を達成できることを見出し、本発明を完成するに至った。 As a result of intensive studies, the present inventor has found that the above object can be achieved when a specific moisture-proof film is used, and has completed the present invention.
 即ち、本発明は、下記の床用化粧材に関する。
1.木質基材のおもて面に化粧シートが積層されており、前記木質基材の裏面に防湿フィルムが積層されている床用化粧材であって、
(1)前記木質基材は、1%含水率変化当たりの寸法変化量が0.02%よりも大きく、
(2)前記防湿フィルムは、透湿度が7g/m・24時間以下である
ことを特徴とする床用化粧材。
2.木質基材のおもて面に化粧シートが積層されており、前記木質基材の裏面に防湿フィルムが積層されている床用化粧材であって、
(1)前記木質基材は、1%含水率変化当たりの寸法変化量が0.02%よりも大きく、
(2)前記防湿フィルムは、透湿度が7g/m・24時間以下であり、
(3)前記木質基材は、平均含水率が6~10重量%であり、且つ中央部の含水率が周辺部の含水率と比較して-1%~+2%の範囲である
ことを特徴とする床用化粧材。
3.前記木質基材は、中密度木質繊維板(MDF)、高密度木質繊維板(HDF)、パーティクルボード(PB)、針葉樹合板及び早成樹合板からなる群から選択される少なくとも1種である、上記項1又は2に記載の床用化粧材。
4.前記防湿フィルムは、少なくとも合成樹脂製基材層と蒸着層とを有する、上記項1又は2に記載の床用化粧材。
5.前記防湿フィルムは、前記合成樹脂製基材層と前記蒸着層との間にプライマー層を有する、上記項4に記載の床用化粧材。
6.前記防湿フィルムは、前記合成樹脂製基材層/プライマー層/前記蒸着層/表面コート層からなる、上記項4に記載の床用化粧材。
7.前記防湿フィルムの片面又は両面に更にプライマー層を有する、上記項4に記載の床用化粧材。
8.前記化粧シート及び前記防湿フィルムは、接着剤により前記木質基材に積層されている、上記項1又は2に記載の床用化粧材。
9.床暖房用床材である、上記項1又は2に記載の床用化粧材。
That is, the present invention relates to the following floor decorative material.
1. A decorative sheet for flooring in which a decorative sheet is laminated on the front surface of the wooden substrate, and a moisture-proof film is laminated on the back surface of the wooden substrate,
(1) The wooden base material has a dimensional change per 1% moisture content change larger than 0.02%,
(2) The moisture-proof film has a moisture permeability of 7 g / m 2 · 24 hours or less.
2. A decorative sheet for flooring in which a decorative sheet is laminated on the front surface of the wooden substrate, and a moisture-proof film is laminated on the back surface of the wooden substrate,
(1) The wooden base material has a dimensional change per 1% moisture content change larger than 0.02%,
(2) The moisture-proof film has a moisture permeability of 7 g / m 2 · 24 hours or less,
(3) The wood base material has an average moisture content of 6 to 10% by weight, and a moisture content in a central part is in a range of -1% to + 2% as compared with a moisture content in a peripheral part. Flooring cosmetics.
3. The wood substrate is at least one selected from the group consisting of medium density wood fiber board (MDF), high density wood fiber board (HDF), particle board (PB), softwood plywood, and early-wood plywood, Item 3. A floor decorative material according to Item 1 or 2.
4). Item 3. The floor decorative material according to Item 1 or 2, wherein the moisture-proof film has at least a synthetic resin base material layer and a vapor deposition layer.
5). Item 5. The floor decorative material according to Item 4, wherein the moisture-proof film has a primer layer between the synthetic resin substrate layer and the vapor deposition layer.
6). Item 5. The floor decorative material according to Item 4, wherein the moisture-proof film is composed of the synthetic resin base layer / primer layer / deposition layer / surface coat layer.
7). Item 5. The floor decorative material according to Item 4, further comprising a primer layer on one or both surfaces of the moisture-proof film.
8). Item 3. The floor decorative material according to Item 1 or 2, wherein the decorative sheet and the moisture-proof film are laminated on the wooden substrate with an adhesive.
9. Item 3. The floor decorative material according to Item 1 or 2, which is a flooring material for floor heating.
 以下、本発明の床用化粧材について詳細に説明する。 Hereinafter, the floor decorative material of the present invention will be described in detail.
 本発明の床用化粧材は、木質基材のおもて面に化粧シートが積層されており、前記木質基材の裏面に防湿フィルムが積層されている床用化粧材であって、
(1)前記木質基材は、1%含水率変化当たりの寸法変化量が0.02%よりも大きく、
(2)前記防湿フィルムは、透湿度が7g/m・24時間以下であることを特徴とする。なお、透湿度は、JIS Z0208(透湿度試験方法(カップ法))に準じて温度40℃、湿度90%RH環境下での測定値である。以下、本明細書における透湿度は当該条件における測定値を示す。
The flooring decorative material of the present invention is a flooring decorative material in which a decorative sheet is laminated on the front surface of a wooden substrate, and a moisture-proof film is laminated on the back surface of the wooden substrate,
(1) The wooden base material has a dimensional change per 1% moisture content change larger than 0.02%,
(2) The moisture-proof film has a moisture permeability of 7 g / m 2 · 24 hours or less. The moisture permeability is a measured value in an environment of a temperature of 40 ° C. and a humidity of 90% RH according to JIS Z0208 (moisture permeability test method (cup method)). Hereinafter, the moisture permeability in the present specification indicates a measured value under the conditions.
 上記特徴を有する本発明の床用化粧材は、透湿度が7g/m・24時間以下である防湿フィルムを有することにより、木質基材裏面の透湿性が低く抑えられている。そのため、木質基材として1%含水率変化当たりの寸法変化量が0.02%よりも大きいラワン代替材料を用いてそのおもて面に透湿性の低い化粧シートを積層した場合でも、木質基材のおもて面と裏面の透湿性を同程度に設定することができるため、床用化粧材の反りや引き曲がりの発生が十分に抑制されている。このような本発明の床用化粧材は、各種建築物の床面に施工する床用化粧材及び特殊用途として床暖房用途に用いる床用化粧材として適している。 The floor decorative material of the present invention having the above characteristics has a moisture-proof film having a moisture permeability of 7 g / m 2 · 24 hours or less, so that the moisture permeability of the back surface of the wooden substrate is kept low. Therefore, even when a laminating substitute material with a dimensional change per 1% moisture content change larger than 0.02% is used as a wooden base material and a decorative sheet with low moisture permeability is laminated on the front surface, the wooden base Since the moisture permeability of the front surface and the back surface of the material can be set to the same level, the occurrence of warping and bending of the floor decorative material is sufficiently suppressed. Such a flooring material of the present invention is suitable as a flooring material to be constructed on the floor surface of various buildings and as a flooring material used for floor heating as a special application.
 以下、本発明の床用化粧材の各構成について説明する。 Hereinafter, each configuration of the decorative material for floor according to the present invention will be described.
(木質基材)
 本発明の木質基材としては、ラワン代替材料を用いる。つまり、従来のラワン合板等に置き換わる材料であって、例えば、中密度木質繊維板(MDF)、高密度木質繊維板(HDF)、パーティクルボード(PB)、針葉樹合板、早成樹合板等の少なくとも1種を用いる。早成樹としては、ポプラ、ファルカタ、アカシア、カメレレ、ユーカリ、ターミナリア等が挙げられる。これらのラワン代替材料は、1%含水率変化当たりの寸法変化量が0.02%よりも大きい。
(Wood base)
As the woody base material of the present invention, a Lawan alternative material is used. In other words, it is a material that replaces the conventional lauan plywood and the like, for example, at least one of medium density wood fiber board (MDF), high density wood fiber board (HDF), particle board (PB), softwood plywood, early-wood plywood, etc. Use seeds. Examples of early mature trees include poplar, falkata, acacia, chamelere, eucalyptus, terminaria and the like. These Lauan alternative materials have a dimensional change per 1% moisture content change greater than 0.02%.
 なお、本明細書における「1%含水率当たりの寸法変化量」は、次の手順により測定される寸法変化量である。
(1)300mm×303mmにカットした木質基材の試験片を用意する。
(2)常温(25℃)環境下、試験片の現在の寸法(四辺の長さ)をノギスで測定する。
(3)試験片を40℃オーブン(湿度フリー、dry雰囲気≒0%)に1週間放置する。
(4)1週間後、試験片の重量と寸法(四辺の長さ)を測定する。
(5)両条件の測定データから1%含水率変化当たりの寸法変化率を測定する。
In addition, the “dimensional change per 1% water content” in the present specification is a dimensional change measured by the following procedure.
(1) Prepare a test piece of wood base material cut to 300 mm × 303 mm.
(2) In a normal temperature (25 ° C.) environment, the current dimensions (length of four sides) of the test piece are measured with a caliper.
(3) The test piece is left in a 40 ° C. oven (humidity free, dry atmosphere≈0%) for one week.
(4) After one week, the weight and dimensions (length of four sides) of the test piece are measured.
(5) The dimensional change rate per 1% moisture content change is measured from the measurement data of both conditions.
 木質基材の厚みは特に限定的ではないが、2~15mm程度が好ましく、2~12mm程度がより好ましい。 The thickness of the wooden substrate is not particularly limited, but is preferably about 2 to 15 mm, more preferably about 2 to 12 mm.
 本発明では、床用化粧材を施工場所に応じてカットして用いる場合に備えて、木質基材として、平均含水率が6~10重量%であり、且つ中央部の含水率が周辺部の含水率と比較して-1%~+2%の範囲である木質基材を用いることが好ましい。木質基材のサイズが、例えば、縦150mm×横1840mm程度(特に短辺の長さが200mm以下)となる場合は、木質基材の中央部と周辺部の含水率の偏りによって反りや曳き曲がりが生じ易くなる。よって、木質基材の含水率特性を上記条件に設定することにより、床用化粧材をカットして用いる場合でも反りや曳き曲がりの発生を抑制することができる。なお、床用化粧材をカットして用いる場合としては、具体的には、床用化粧材を施工する部屋の隅部分(壁際又は柱の周辺)に施工する場合が想定される。 In the present invention, in preparation for the case where the flooring decorative material is cut and used depending on the construction site, the wood substrate has an average moisture content of 6 to 10% by weight and a central moisture content of the peripheral portion. It is preferable to use a wooden substrate having a range of -1% to + 2% compared to the moisture content. When the size of the wood base material is, for example, about 150 mm long × 1840 mm wide (especially, the length of the short side is 200 mm or less), the warp or curl due to the deviation of the moisture content between the central part and the peripheral part of the wooden base material Is likely to occur. Therefore, by setting the moisture content characteristic of the wooden base material to the above-described conditions, it is possible to suppress the occurrence of warping and curving even when the floor decorative material is cut and used. In addition, as a case where the decorative material for floors is cut and used, specifically, a case where the floor decorative material is applied to a corner portion of a room where the decorative material for flooring is applied (by the wall or around the pillar) is assumed.
 木質基材の平均含水率は、6~10重量%が好ましく、6.5~8重量%がより好ましい。平均含水率が上記範囲内であれば、カット後の曳き曲がりや反りの発生を抑制し易い。その中でも、床用化粧材を床暖房用途に用いる場合には、平均含水率を6~9重量%に設定することが好ましい。 The average moisture content of the wooden base material is preferably 6 to 10% by weight, and more preferably 6.5 to 8% by weight. If the average moisture content is within the above range, it is easy to suppress the occurrence of curving and warping after cutting. Among them, when the floor decorative material is used for floor heating, the average moisture content is preferably set to 6 to 9% by weight.
 木質基材の含水率は、中央部の含水率が周辺部の含水率と比較して-1%~+2%の範囲であることが好ましく、-0.5%~+1%の範囲であることがより好ましい。なお、木質基材の周辺部とは木質基材の周囲5cmの範囲を意味し、木質基材の中央部とは前記周辺部を除いた木質基材の内部を意味する。 The moisture content of the wood substrate is preferably in the range of -1% to + 2%, more preferably in the range of -0.5% to + 1%, compared to the moisture content in the central part. Is more preferable. In addition, the peripheral part of a wooden base material means the range of 5 cm around a wooden base material, and the center part of a wooden base material means the inside of the wooden base material except the said peripheral part.
 なお、本明細書における木質基材の平均含水率及び含水率差(以下、「含水率差」は、木質基材の周辺部と中央部の含水率差を示す。)は次の手順で測定される値である。
(A)図3に示す通り、縦303mm×横1818mmの木質基材を用意する。
(B)木質基材の周辺から5cmの範囲を周辺部とし、それよりも内側を中央部とする。図3に1~35で示されるように均等に5cm×5cmのサンプルを35個採取し、全乾法により含水率を測定する。全乾法とは、各サンプルを105℃のオーブンに3日間放置した後、下記算出式から各サンプルの含水率を測定する方法である。放置前を処理前、放置後を処理後と言う。
 含水率(%)={(処理前重量-処理後重量)/処理後重量}×100
(C)35個のサンプルの平均値を「平均含水率」とする。
(D)中央部のサンプル(15個)の平均値から周辺部のサンプル(20個)の平均値を引いた値を「含水率差」とする。
In addition, the average moisture content and moisture content difference (hereinafter, “moisture content difference” in the present specification indicates the moisture content difference between the peripheral portion and the central portion of the wood substrate) is measured by the following procedure. Is the value to be
(A) As shown in FIG. 3, a woody base material having a length of 303 mm and a width of 1818 mm is prepared.
(B) A range of 5 cm from the periphery of the wooden base material is defined as the peripheral portion, and the inside thereof is defined as the central portion. As shown by 1 to 35 in FIG. 3, 35 samples of 5 cm × 5 cm are collected evenly, and the water content is measured by a total dry method. The all-dry method is a method in which each sample is left in an oven at 105 ° C. for 3 days, and then the moisture content of each sample is measured from the following calculation formula. Before leaving is referred to as before processing, and after leaving is referred to as after processing.
Water content (%) = {(weight before treatment−weight after treatment) / weight after treatment} × 100
(C) The average value of 35 samples is defined as “average moisture content”.
(D) The value obtained by subtracting the average value of the peripheral samples (20 samples) from the average value of the central samples (15 samples) is defined as “moisture content difference”.
(化粧シート)
 木質基材のおもて面には化粧シートが積層されている。化粧シートとしては温度40℃、湿度90%における透湿度が7g/m・24時間以下のものが好ましく、5g/m・24時間以下のものが更に好ましい。化粧シートの構造は限定的ではないが、例えば、基材シート上に絵柄層(ベタインキ層・柄インキ層)、透明性樹脂層及び表面保護層を順に有するものが好ましい。以下、この化粧シートを例示的に説明する。
(Decorative sheet)
A decorative sheet is laminated on the front surface of the wooden substrate. The decorative sheet preferably has a moisture permeability of 7 g / m 2 · 24 hours or less at a temperature of 40 ° C. and a humidity of 90%, more preferably 5 g / m 2 · 24 hours or less. The structure of the decorative sheet is not limited, but for example, a decorative sheet having a pattern layer (solid ink layer / pattern ink layer), a transparent resin layer, and a surface protective layer in order on the base sheet is preferable. Hereinafter, this decorative sheet will be exemplarily described.
 基材シートとしては、1)薄紙,上質紙,クラフト紙,和紙,チタン紙,樹脂含浸紙,紙間強化紙等の紙、2)木質繊維,ガラス繊維,石綿,ポリエステル繊維,ビニロン繊維,レーヨン繊維等からなる織布又は不織布、3)ポリオレフィン,ポリエステル,ポリアクリル,ポリアミド,ポリウレタン,ポリスチレン等の合成樹脂製シート、の1種又は2種以上の積層体が挙げられる。 The base sheet is 1) paper such as thin paper, fine paper, kraft paper, Japanese paper, titanium paper, resin-impregnated paper, inter-paper reinforced paper, etc. 2) wood fiber, glass fiber, asbestos, polyester fiber, vinylon fiber, rayon Examples thereof include one or two or more laminates of woven or non-woven fabric made of fibers and the like, and 3) sheets of synthetic resin such as polyolefin, polyester, polyacryl, polyamide, polyurethane, and polystyrene.
 基材シートの厚さは、20~300μm程度が好ましい。基材シートは、必要に応じて着色されていてもよい。また、表面にコロナ放電処理、プラズマ処理、オゾン処理等の表面処理が施されていてもよい。 The thickness of the base sheet is preferably about 20 to 300 μm. The substrate sheet may be colored as necessary. Further, the surface may be subjected to surface treatment such as corona discharge treatment, plasma treatment, or ozone treatment.
 絵柄層は、柄インキ層及び/又はベタインキ層から構成される。絵柄層は、グラビア印刷、オフセット印刷、シルクスクリーン印刷等の印刷法により形成できる。柄インキ層の模様は、例えば、木目模様、石目模様、布目模様、皮紋模様、幾何学模様、文字、記号、線画、各種抽象模様等が挙げられる。ベタインキ層は、着色インキのベタ印刷により得られる。絵柄層は、柄インキ層及びベタインキ層の片方又は両方から構成される。 The pattern layer is composed of a pattern ink layer and / or a solid ink layer. The pattern layer can be formed by a printing method such as gravure printing, offset printing or silk screen printing. Examples of the pattern of the pattern ink layer include a wood grain pattern, a stone pattern, a cloth pattern, a skin pattern, a geometric pattern, characters, symbols, line drawings, various abstract patterns, and the like. The solid ink layer is obtained by solid printing of colored ink. The pattern layer is composed of one or both of a pattern ink layer and a solid ink layer.
 絵柄層に用いるインキとしては、ビヒクルとして、塩素化ポリエチレン、塩素化ポリプロピレン等の塩素化ポリオレフィン、ポリエステル、イソシアネートとポリオールからなるポリウレタン、ポリアクリル、ポリ酢酸ビニル、ポリ塩化ビニル、塩化ビニル-酢酸ビニル共重合体、セルロース系樹脂、ポリアミド系樹脂等を1種又は2種以上混合して用い、これに顔料、溶剤、各種補助剤等を加えてインキ化したものが使用できる。この中でも、環境問題、被印刷面との密着性等の観点より、ポリエステル、イソシアネートとポリオールからなるポリウレタン、ポリアクリル、ポリアミド系樹脂等の1種又は2種以上の混合物が好ましい。 As the ink used for the pattern layer, as a vehicle, chlorinated polyolefin such as chlorinated polyethylene and chlorinated polypropylene, polyester, polyurethane comprising isocyanate and polyol, polyacryl, polyvinyl acetate, polyvinyl chloride, and vinyl chloride-vinyl acetate are used. A polymer, a cellulose-based resin, a polyamide-based resin, or the like may be used alone or in combination, and a pigment, a solvent, various auxiliary agents, and the like may be added thereto to make an ink. Among these, from the viewpoint of environmental problems, adhesion to the printing surface, and the like, one or a mixture of two or more of polyester, polyurethane composed of isocyanate and polyol, polyacryl, polyamide-based resin, and the like is preferable.
 透明性樹脂層は、透明性の樹脂層であれば特に限定されず、例えば、透明性の熱可塑性樹脂により好適に形成できる。 The transparent resin layer is not particularly limited as long as it is a transparent resin layer. For example, the transparent resin layer can be suitably formed of a transparent thermoplastic resin.
 具体的には、軟質、半硬質又は硬質ポリ塩化ビニル、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリアミド、ポリエチレン、ポリプロピレン、エチレン-酢酸ビニル共重合体、エチレン-アクリル酸共重合体、エチレン-アクリル酸エステル共重合体、アイオノマー、アクリル酸エステル、メタアクリル酸エステル等が挙げられる。上記の中でも、ポリプロピレン等のポリオレフィン系樹脂が好ましい。 Specifically, soft, semi-rigid or rigid polyvinyl chloride, polyethylene terephthalate, polybutylene terephthalate, polyamide, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-acrylic acid ester copolymer Examples include polymers, ionomers, acrylic esters, and methacrylic esters. Among the above, polyolefin resins such as polypropylene are preferable.
 透明性樹脂層は、着色されていてもよい。この場合は、熱可塑性樹脂に着色剤を添加すればよい。着色剤としては、絵柄層で用いる顔料又は染料が使用できる。 The transparent resin layer may be colored. In this case, a colorant may be added to the thermoplastic resin. As the colorant, pigments or dyes used in the picture layer can be used.
 透明性樹脂層には、充填剤、艶消し剤、発泡剤、難燃剤、滑剤、帯電防止剤、酸化防止剤、紫外線吸収剤、光安定化剤、ラジカル捕捉剤、軟質成分(例えば、ゴム)等の各種の添加剤を含めてもよい。 For the transparent resin layer, fillers, matting agents, foaming agents, flame retardants, lubricants, antistatic agents, antioxidants, UV absorbers, light stabilizers, radical scavengers, soft components (eg rubber) Various additives such as may be included.
 表面保護層(透明性表面保護層)は、化粧シートに要求される耐擦傷性、耐摩耗性、耐水性、耐汚染性等の表面物性を付与するために設けられる。この表面保護層を形成する樹脂としては、熱硬化型樹脂又は電離放射線硬化型樹脂等の硬化型樹脂が好ましい。特に、電離放射線硬化型樹脂は高い表面硬度、生産性等の観点から好ましい。 The surface protective layer (transparent surface protective layer) is provided for imparting surface physical properties such as scratch resistance, abrasion resistance, water resistance and stain resistance required for the decorative sheet. As the resin for forming the surface protective layer, a curable resin such as a thermosetting resin or an ionizing radiation curable resin is preferable. In particular, ionizing radiation curable resins are preferable from the viewpoint of high surface hardness, productivity, and the like.
 熱硬化型樹脂としては、例えば、不飽和ポリエステル樹脂、ポリウレタン樹脂(2液硬化型ポリウレタンも含む)、エポキシ樹脂、アミノアルキッド樹脂、フェノール樹脂、尿素樹脂、ジアリルフタレート樹脂、メラミン樹脂、グアナミン樹脂、メラミン-尿素共縮合樹脂、珪素樹脂、ポリシロキサン樹脂等が挙げられる。 Examples of thermosetting resins include unsaturated polyester resins, polyurethane resins (including two-component curable polyurethane), epoxy resins, amino alkyd resins, phenol resins, urea resins, diallyl phthalate resins, melamine resins, guanamine resins, and melamines. -Urea cocondensation resin, silicon resin, polysiloxane resin and the like.
 上記樹脂には、架橋剤、重合開始剤等の硬化剤、重合促進剤を添加することができる。例えば、硬化剤としてはイソシアネート、有機スルホン酸塩等が不飽和ポリエステル樹脂やポリウレタン樹脂等に添加でき、有機アミン等がエポキシ樹脂に添加でき、メチルエチルケトンパーオキサイド等の過酸化物、アゾイソブチルニトリル等のラジカル開始剤が不飽和ポリエステル樹脂に添加できる。 A curing agent such as a crosslinking agent and a polymerization initiator and a polymerization accelerator can be added to the resin. For example, as curing agents, isocyanates, organic sulfonates, etc. can be added to unsaturated polyester resins, polyurethane resins, etc., organic amines, etc. can be added to epoxy resins, peroxides such as methyl ethyl ketone peroxide, azoisobutyl nitrile, etc. A radical initiator can be added to the unsaturated polyester resin.
 熱硬化型樹脂で表面保護層を形成する方法としては、例えば、熱硬化型樹脂の溶液をロールコート法、グラビアコート法等の塗布法で塗布し、乾燥・硬化させる方法が挙げられる。溶液の塗布量としては、固形分で概ね5~30μm、好ましくは5~20μm程度である。 Examples of the method for forming the surface protective layer with a thermosetting resin include a method in which a solution of a thermosetting resin is applied by a coating method such as a roll coating method or a gravure coating method and then dried and cured. The coating amount of the solution is about 5 to 30 μm, preferably about 5 to 20 μm in terms of solid content.
 電離放射線硬化型樹脂は、電離放射線の照射により架橋重合反応を生じ、3次元の高分子構造に変化する樹脂であれば限定されない。例えば、電離放射線の照射により架橋可能な重合性不飽和結合又はエポキシ基を分子中に有するプレポリマー、オリゴマー及びモノマーの1種以上が使用できる。例えば、ウレタンアクリレート、ポリエステルアクリレート、エポキシアクリレート等のアクリレート樹脂;シロキサン等のケイ素樹脂;ポリエステル樹脂;エポキシ樹脂などが挙げられる。 The ionizing radiation curable resin is not limited as long as it is a resin that undergoes a crosslinking polymerization reaction upon irradiation with ionizing radiation and changes to a three-dimensional polymer structure. For example, one or more prepolymers, oligomers and monomers having a polymerizable unsaturated bond or epoxy group that can be crosslinked by irradiation with ionizing radiation in the molecule can be used. Examples thereof include acrylate resins such as urethane acrylate, polyester acrylate, and epoxy acrylate; silicon resins such as siloxane; polyester resins; epoxy resins and the like.
 電離放射線としては、可視光線、紫外線(近紫外線、真空紫外線等)、X線、電子線、イオン線等があるが、この中でも、紫外線、電子線が望ましい。 Ionizing radiation includes visible light, ultraviolet light (near ultraviolet light, vacuum ultraviolet light, etc.), X-rays, electron beams, ion beams, etc. Among them, ultraviolet light and electron beams are preferable.
 紫外線源としては、超高圧水銀灯、高圧水銀灯、低圧水銀灯、カーボンアーク灯、ブラックライト蛍光灯、メタルハライドランプ灯の光源が使用できる。紫外線の波長としては、190~380nm程度である。 As the ultraviolet light source, an ultra-high pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc lamp, a black light fluorescent lamp, or a metal halide lamp can be used. The wavelength of ultraviolet light is about 190 to 380 nm.
 電子線源としては、例えば、コッククロフトワルト型、バンデグラフト型、共振変圧器型、絶縁コア変圧器型、直線型、ダイナミトロン型、高周波型等の各種電子線加速器が使用できる。電子線のエネルギーとしては、100~1000keV程度が好ましく、100~300keV程度がより好ましい。電子線の照射量は、2~15Mrad程度が好ましい。 As the electron beam source, for example, various electron beam accelerators such as a cockcroft-wald type, a bandegraft type, a resonant transformer type, an insulating core transformer type, a linear type, a dynamitron type, and a high frequency type can be used. The energy of the electron beam is preferably about 100 to 1000 keV, more preferably about 100 to 300 keV. The irradiation amount of the electron beam is preferably about 2 to 15 Mrad.
 電離放射線硬化型樹脂は電子線を照射すれば十分に硬化するが、紫外線を照射して硬化させる場合には、光重合開始剤(増感剤)を添加することが好ましい。 The ionizing radiation curable resin is sufficiently cured when irradiated with an electron beam, but it is preferable to add a photopolymerization initiator (sensitizer) when cured by irradiation with ultraviolet rays.
 ラジカル重合性不飽和基を有する樹脂系の場合の光重合開始剤は、例えば、アセトフェノン類、ベンゾフェノン類、チオキサントン類、ベンゾイン、ベンゾインメチルエーテル、ミヒラーベンゾイルベンゾエート、ミヒラーケトン、ジフェニルサルファイド、ジベンジルジサルファイド、ジエチルオキサイト、トリフェニルビイミダゾール、イソプロピル-N,N-ジメチルアミノベンゾエート等の少なくとも1種が使用できる。また、カチオン重合性官能基を有する樹脂系の場合は、例えば、芳香族ジアゾニウム塩、芳香族スルホニウム塩、メタロセン化合物、ベンゾインスルホン酸エステル、フリールオキシスルホキソニウムジアリルヨードシル塩等の少なくとも1種が使用できる。 Photopolymerization initiators in the case of resin systems having radically polymerizable unsaturated groups include, for example, acetophenones, benzophenones, thioxanthones, benzoin, benzoin methyl ether, Michler benzoylbenzoate, Michler ketone, diphenyl sulfide, dibenzyl disulfide , Diethyl oxide, triphenylbiimidazole, isopropyl-N, N-dimethylaminobenzoate and the like can be used. In the case of a resin system having a cationic polymerizable functional group, for example, at least one kind such as an aromatic diazonium salt, an aromatic sulfonium salt, a metallocene compound, a benzoin sulfonic acid ester, and a freeloxysulfoxonium diallyl iodosyl salt. Can be used.
 光重合開始剤の添加量は特に限定されないが、一般に電離放射線硬化型樹脂100重量部に対して0.1~10重量部程度である。 The addition amount of the photopolymerization initiator is not particularly limited, but is generally about 0.1 to 10 parts by weight with respect to 100 parts by weight of the ionizing radiation curable resin.
 電離放射線硬化型樹脂で保護層を形成する方法としては、例えば、電離放射線硬化型樹脂の溶液をグラビアコート法、ロールコート法等の塗布法で塗布すればよい。溶液の塗布量としては、固形分として概ね5~30μm、好ましくは5~20μm程度である。 As a method of forming a protective layer with an ionizing radiation curable resin, for example, a solution of an ionizing radiation curable resin may be applied by a coating method such as a gravure coating method or a roll coating method. The coating amount of the solution is about 5 to 30 μm, preferably about 5 to 20 μm as a solid content.
 電離放射線硬化型樹脂から形成された表面保護層に、耐擦傷性、耐摩耗性をさらに付与する場合には、無機充填材を配合すればよい。無機充填材としては、例えば、粉末状の酸化アルミニウム、炭化珪素、二酸化珪素、チタン酸カルシウム、チタン酸バリウム、マグネシウムパイロボレート、酸化亜鉛、窒化珪素、酸化ジルコニウム、酸化クロム、酸化鉄、窒化硼素、ダイアモンド、金剛砂、ガラス繊維等が挙げられる。 In the case of further imparting scratch resistance and abrasion resistance to the surface protective layer formed from the ionizing radiation curable resin, an inorganic filler may be blended. Examples of inorganic fillers include powdered aluminum oxide, silicon carbide, silicon dioxide, calcium titanate, barium titanate, magnesium pyroborate, zinc oxide, silicon nitride, zirconium oxide, chromium oxide, iron oxide, boron nitride, Examples include diamond, gold sand and glass fiber.
 無機充填材の添加量としては、電離放射線硬化型樹脂100重量部に対して1~80重量部程度である。 The amount of the inorganic filler added is about 1 to 80 parts by weight with respect to 100 parts by weight of the ionizing radiation curable resin.
 各層の積層は、例えば、基材シートの一方の面に絵柄層(ベタインキ層、柄インキ層)を順に印刷により形成後、絵柄層上に2液硬化型ウレタン樹脂等の公知のドライラミネーション用接着剤を介して透明性樹脂層をドライラミネーション法、Tダイ押出し法等で積層し、さらに表面保護層を形成する方法により行える。 Lamination of each layer is, for example, by forming a pattern layer (solid ink layer, pattern ink layer) on one side of the base sheet by printing in order, and then bonding a known dry lamination such as a two-component curable urethane resin on the pattern layer. A transparent resin layer can be laminated by a dry lamination method, a T-die extrusion method or the like via an agent, and a surface protective layer can be formed.
 表面保護層側からエンボス加工を施すことにより凹凸模様を形成してもよい。凹凸模様は、加熱プレス、ヘアライン加工等により形成できる。凹凸模様としては、導管溝、石板表面凹凸、布表面テクスチュア、梨地、砂目、ヘアライン、万線条溝等が挙げられる。 An uneven pattern may be formed by embossing from the surface protective layer side. The concavo-convex pattern can be formed by heating press, hairline processing or the like. Examples of the uneven pattern include a conduit groove, a stone plate surface unevenness, a cloth surface texture, a satin finish, a grain, a hairline, and a line groove.
 上記化粧シートは、最下層(木質基材と接着する層)に厚さ100μm以上の合成樹脂層(いわゆるバッカー層)を有していてもよい。なお、バッカー層は、床用化粧材において衝撃吸収等を目的とした緩衝層を意味する。バッカー層を構成する材料としては、例えば、ポリプロピレン、エチレン-ビニルアルコール共重合体、ポリメチレン、ポリメチルペンテン、ポリエチレンテレフタレート、耐熱性の高いポリアルキレンテレフタレート〔例えば、エチレングリコールの一部を1,4-シクロヘキサンジメタノールやジエチレングリコール等で置換したポリエチレンテレフタレートである、いわゆる商品名PET-G(イーストマンケミカルカンパニー製)〕、ポリブチレンテレフタレート、ポリエチレンナフタレート、ポリエチレンナフタレート-イソフタレート共重合体、ポリカーボネート、ポリアリレート、ポリイミド、ポリスチレン、ポリアミド、ABS等が挙げられる。これらの樹脂は単独又は2種以上で使用できる。バッカー層の厚さの上限は限定的ではないが、600μmが適当である。 The decorative sheet may have a synthetic resin layer (so-called backer layer) having a thickness of 100 μm or more in the lowermost layer (layer that adheres to the wooden substrate). In addition, a backer layer means the buffer layer aiming at shock absorption etc. in the decorative material for floors. Examples of the material constituting the backer layer include polypropylene, ethylene-vinyl alcohol copolymer, polymethylene, polymethylpentene, polyethylene terephthalate, and high heat-resistant polyalkylene terephthalate [for example, a part of ethylene glycol is 1,4- Polyethylene terephthalate substituted with cyclohexanedimethanol, diethylene glycol, etc., so-called trade name PET-G (manufactured by Eastman Chemical Company)], polybutylene terephthalate, polyethylene naphthalate, polyethylene naphthalate-isophthalate copolymer, polycarbonate, poly Examples include arylate, polyimide, polystyrene, polyamide, and ABS. These resins can be used alone or in combination of two or more. The upper limit of the thickness of the backer layer is not limited, but 600 μm is appropriate.
 上記化粧シートを木質基材に積層する際は、公知の接着剤が使用できる。接着剤としては、例えば、ポリ酢酸ビニル、ポリ塩化ビニル、塩化ビニル・酢酸ビニル共重合体、エチレン・アクリル酸共重合体、アイオノマー、ブタジエン・アクリルニトリルゴム、ネオプレンゴム、天然ゴム等を有効成分とする接着剤が挙げられる。接着剤層の厚さは限定的ではないが、0.1~50μm程度が好ましい。 When laminating the decorative sheet on the wooden base material, a known adhesive can be used. Examples of the adhesive include polyvinyl acetate, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ionomer, butadiene / acrylonitrile rubber, neoprene rubber, natural rubber, and the like as active ingredients. Adhesives to be used. The thickness of the adhesive layer is not limited, but is preferably about 0.1 to 50 μm.
(防湿フィルム)
 防湿フィルムは、木質基材の裏面に設けられる。本発明では、防湿フィルムは、温度40℃、湿度90%における透湿度が7g/m・24時間以下のものを用いる。その中でも透湿度が5g/m・24時間以下のものが好ましい。
(Dampproof film)
The moisture-proof film is provided on the back surface of the wooden substrate. In the present invention, a moisture-proof film having a moisture permeability of 7 g / m 2 · 24 hours or less at a temperature of 40 ° C. and a humidity of 90% is used. Among them, the moisture permeability is preferably 5 g / m 2 · 24 hours or less.
 防湿フィルムは上記透湿度を満たす限り限定されず、例えば、ポリエチレン,ポリプロピレン等のオレフィン系熱可塑性樹脂、ポリエチレンテレフタレート,ポリブチレンテレフタレート,ポリエチレンナフタレート等のエステル系熱可塑性樹脂などの合成樹脂製フィルムが使用できる。この中でも、特に少なくとも合成樹脂製基材層と蒸着層とを有するものが好ましい。以下、この態様について例示して説明する。 The moisture-proof film is not limited as long as the above moisture permeability is satisfied. For example, a synthetic resin film such as an olefin-based thermoplastic resin such as polyethylene or polypropylene, or an ester-based thermoplastic resin such as polyethylene terephthalate, polybutylene terephthalate, or polyethylene naphthalate is used. Can be used. Among these, those having at least a synthetic resin base material layer and a vapor deposition layer are particularly preferable. Hereinafter, this aspect will be described by way of example.
 合成樹脂製基材層としては、ポリエチレン,ポリプロピレン,エチレン-プロピレン共重合体,エチレン-ビニルアルコール共重合体,これらの混合物等のオレフィン系熱可塑性樹脂;ポリエチレンテレフタレート,ポリブチレンテレフタレート,ポリエチレンナフタレート,ポリエチレンナフタレート-イソフタレート共重合体,ポリカーボネート,ポリアリレート等のエステル系熱可塑性樹脂;ポリメタアクリル酸メチル,ポリメタアクリル酸エチル,ポリアクリル酸ブチル等のアクリル系熱可塑性樹脂;ポリイミド、ポリウレタン、ポリスチレン、アクリロニトリル-ブタジエン-スチレン樹脂等の非ハロゲン系熱可塑性樹脂などが挙げられる。 Synthetic resin substrate layers include polyethylene, polypropylene, ethylene-propylene copolymers, ethylene-vinyl alcohol copolymers, olefinic thermoplastic resins such as mixtures thereof; polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, Ester thermoplastic resins such as polyethylene naphthalate-isophthalate copolymer, polycarbonate and polyarylate; Acrylic thermoplastic resins such as methyl polymethacrylate, ethyl polymethacrylate, polybutyl acrylate; polyimide, polyurethane, Non-halogen thermoplastic resins such as polystyrene and acrylonitrile-butadiene-styrene resin can be used.
 合成樹脂製基材層は、一軸又は二軸方向に延伸したシートであっても、未延伸であってもよい。合成樹脂製基材層は、更に蒸着層が積層されることが好ましく、蒸着層が形成される基材としての位置付けから、機械的強度が強く、寸法安定性に優れるなどの理由から二軸方向に延伸したシートが好ましい。合成樹脂製基材層の厚さは、概ね9~25μmが適当である。 The synthetic resin base material layer may be a sheet stretched in a uniaxial or biaxial direction, or may be unstretched. It is preferable that the synthetic resin base material layer is further laminated with a vapor deposition layer. From the positioning as the base material on which the vapor deposition layer is formed, the mechanical strength is strong and the dimensional stability is biaxial. The sheet | seat extended | stretched is preferable. The appropriate thickness of the synthetic resin base material layer is approximately 9 to 25 μm.
 蒸着層としては、アルミニウムに代表される金属薄膜からなる無機物の蒸着層、酸化珪素、酸化マグネシウム、酸化アルミニウムに代表される無機酸化物薄膜からなる無機酸化物蒸着層が挙げられる。蒸着層は、真空蒸着法、プラズマ活性化化学反応蒸着法等の周知の蒸着法で、合成樹脂製基材層に形成される。より好ましくは、蒸着層が透明である無機酸化物蒸着層である。 Examples of the vapor deposition layer include an inorganic vapor deposition layer composed of a metal thin film typified by aluminum, and an inorganic oxide vapor deposition layer composed of an inorganic oxide thin film typified by silicon oxide, magnesium oxide, and aluminum oxide. The vapor deposition layer is formed on the 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. More preferably, it is an inorganic oxide vapor deposition layer whose vapor deposition layer is transparent.
 蒸着層のガスバリア性を一層向上させる目的で、蒸着層上に表面コート層を設けてもよい。表面コート層としては、ポリビニルアルコール系樹脂が挙げられる。また、一般式R M(OR(ただし、式中、R、Rは炭素数1~8の有機基を表し、Mは金属原子を表し、nは0以上の整数を表し、mは1以上の整数を表し、n+mはMの原子価を表す)で表される少なくとも1種以上のアルコキシドと、ポリビニルアルコール系樹脂及び/又はエチレン・ビニルアルコール共重合体とを含有し、更にゾル-ゲル法触媒、酸、水及び有機溶剤の存在下でゾルゲル法によって重縮合して調製される組成物が挙げられる。また、ポリビニルアルコール及びエチレン・ビニルアルコール共重合体を組み合わせることによって、ガスバリア性、耐水性、耐候性などが著しく向上する。上記組成物にはシランカップリング剤等を添加してもよい。これらの樹脂又は組成物を蒸着層上にロールコート法、グラビアコート法等の周知の塗布方法で塗布することにより表面コート層が得られる。表面コート層は蒸着層の保護層としても機能し、その厚さは概ね1~10μmが適当である。 In order to further improve the gas barrier property of the vapor deposition layer, a surface coat layer may be provided on the vapor deposition layer. Examples of the surface coat layer include polyvinyl alcohol resins. In addition, general formula R 1 n M (OR 2 ) m (wherein R 1 and R 2 represent an organic group having 1 to 8 carbon atoms, M represents a metal atom, and n represents an integer of 0 or more) M represents an integer of 1 or more, and n + m represents a valence of M), and a polyvinyl alcohol resin and / or an ethylene / vinyl alcohol copolymer. Further, a composition prepared by polycondensation by a sol-gel method in the presence of a sol-gel method catalyst, an acid, water and an organic solvent can be mentioned. Further, by combining polyvinyl alcohol and an ethylene / vinyl alcohol copolymer, gas barrier properties, water resistance, weather resistance and the like are remarkably improved. A silane coupling agent or the like may be added to the composition. A surface coat layer is obtained by applying these resins or compositions on the vapor deposition layer by a known coating method such as a roll coating method or a gravure coating method. The surface coat layer also functions as a protective layer for the vapor deposition layer, and a thickness of about 1 to 10 μm is appropriate.
 上記合成樹脂製基材層及び/又は上記表面コート層は、必要に応じて、コロナ処理等の表面処理を施すことができる。このような表面処理によって、更に隣接層との接着強度を高めることができる。 The base layer made of synthetic resin and / or the surface coat layer can be subjected to surface treatment such as corona treatment as necessary. By such surface treatment, the adhesive strength with the adjacent layer can be further increased.
 本発明では、合成樹脂製基材層と蒸着層との間、並びに防湿フィルムの片面又は両面に更にプライマー層を設けてもよい。従って、防湿フィルムの好適な態様は、例えば、「合成樹脂製基材層/プライマー層/蒸着層/表面コート層」の態様であり、更に、当該防湿フィルムの片面又は両面にプライマー層を設けた態様でも良い。 In the present invention, a primer layer may be further provided between the synthetic resin base material layer and the vapor deposition layer and on one side or both sides of the moisture-proof film. Therefore, a suitable aspect of the moisture-proof film is, for example, an aspect of “synthetic resin substrate layer / primer layer / deposition layer / surface coat layer”, and further provided with a primer layer on one or both sides of the moisture-proof film. An aspect may be sufficient.
 これらのプライマー層は、合成樹脂製基材層と蒸着層との密着性を高めるためや、防湿フィルムを他の層に積層する際の密着性を高めるために設ける。 These primer layers are provided in order to increase the adhesion between the synthetic resin base material layer and the vapor deposition layer and to increase the adhesion when the moisture-proof film is laminated on another layer.
 このようなプライマー層に用いる樹脂としては、エステル系樹脂、ウレタン系樹脂、アクリル系樹脂、ポリカーボネート系樹脂、塩化ビニル-酢酸ビニル共重合体、ポリビニルブチラール系樹脂、ニトロセルロース系樹脂等を挙げることができ、これらの樹脂は単独又は混合して使用できる。プライマー層の形成は、ロールコート法やグラビア印刷法等の適宜の塗布手段を用いて行える。 Examples of the resin used for such a primer layer include ester resins, urethane resins, acrylic resins, polycarbonate resins, vinyl chloride-vinyl acetate copolymers, polyvinyl butyral resins, nitrocellulose resins, and the like. These resins can be used alone or in combination. The primer layer can be formed using an appropriate application means such as a roll coating method or a gravure printing method.
 この中でも、プライマー層は、(i)アクリル樹脂とウレタン樹脂との共重合体と(ii)イソシアネートとから形成するのが好ましい。即ち、(i)のアクリル樹脂とウレタン樹脂との共重合体は、末端に水酸基を有するアクリル重合体成分(成分A)、両末端に水酸基を有するポリエステルポリオール成分(成分B)、ジイソシアネート成分(成分C)を配合して反応させてプレポリマーとなし、該プレポリマーに更にジアミンなどの鎖延長剤(成分D)を添加して鎖延長することで得られるものである。この反応によりポリエステルウレタンが形成されると共にアクリル重合体成分が分子中に導入され、末端に水酸基を有するアクリル-ポリエステルウレタン共重合体が形成される。このアクリル-ポリエステルウレタン共重合体の末端の水酸基を(ii)のイソシアネートと反応させて硬化させて形成する。 Among these, the primer layer is preferably formed from (i) a copolymer of an acrylic resin and a urethane resin and (ii) an isocyanate. That is, the copolymer of (i) an acrylic resin and a urethane resin is composed of 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.
 前記成分Aは、末端に水酸基を有する直鎖状のアクリル酸エステル重合体が用いられる。具体的には、末端に水酸基を有する直鎖状のポリメチルメタクリレート(PMMA)が耐候性(特に光劣化に対する特性)に優れ、ウレタンと共重合させるのが容易である点から好ましい。前記成分Aは、共重合体においてアクリル樹脂成分となるものであり、分子量5000~7000(重量平均分子量)のものが耐候性、接着性が特に良好であるために好ましく用いられる。また、前記成分Aは、両末端に水酸基を有するもののみを用いてもよいが、片末端に共役二重結合が残っているものを上記の両末端に水酸基を有するものと混合して用いてもよい。 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, characteristics against photodegradation) and can be easily copolymerized with urethane. Component A is an acrylic resin component in the copolymer, and a component having a molecular weight of 5000 to 7000 (weight average molecular weight) is 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. Also good.
 前記成分Bは、ジイソシアネートと反応してポリエステルウレタンを形成し、共重合体においてウレタン樹脂成分を構成する。前記成分Bは、両末端に水酸基を有するポリエステルジオールが用いられる。このポリエステルジオールとしては、芳香族又はスピロ環骨格を有するジオール化合物とラクトン化合物又はその誘導体、又はエポキシ化合物との付加反応生成物、二塩基酸とジオールとの縮合生成物、及び、環状エステル化合物から誘導されるポリエステル化合物等を挙げることができる。上記ジオールとしては、エチレングリコール、プロピレングリコール、ジエチレングリコール、ブタンジオール、ヘキサンジオール、メチルペンテンジオール等の短鎖ジオール;1,4-シクロへキサンジメタノール等の脂環族短鎖ジオール等を挙げることができる。また、二塩基酸としては、アジピン酸、フタル酸、イソフタル酸、テレフタル酸等を挙げることができる。ポリエステルポリオールとして好ましいのは、酸成分としてアジピン酸又はアジピン酸とテレフタル酸の混合物、特にアジピン酸が好ましく、ジオール成分として3-メチルペンテンジオール及び1,4-シクロへキサンジメタノールを用いたアジペート系ポリエステルである。 The 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. Examples of the dibasic acid include adipic acid, phthalic acid, isophthalic acid, terephthalic acid and the like. Preferred as the polyester polyol is adipic acid using adipic acid or a mixture of adipic acid and terephthalic acid as the acid component, particularly preferably adipic acid, and 3-methylpentenediol and 1,4-cyclohexanedimethanol as the diol component. Polyester.
 前記プライマー層において、前記成分Bと前記成分Cとが反応して形成されるウレタン樹脂成分は、前記プライマー層に柔軟性を与え、接着性向上に寄与する。また、アクリル重合体からなるアクリル樹脂成分は、前記プライマー層において耐候性および耐ブロッキング性に寄与する。ウレタン樹脂において、前記成分Bの分子量は前記プライマー層に柔軟性を十分に発揮可能なウレタン樹脂が得られる範囲であればよく、アジピン酸又はアジピン酸とテレフタル酸の混合物と、3-メチルペンタンジオール及び1,4-シクロへキサンジメタノールからなるポリエステルジオールの場合、500~5000(重量平均分子量)が好ましい。 In the primer layer, the urethane resin component formed by the reaction of the component B and the component C gives flexibility to the primer layer and contributes to an improvement in adhesion. Moreover, the acrylic resin component which consists of an acrylic polymer contributes to a weather resistance and blocking resistance in the said primer layer. 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 layer is obtained. Adipic acid or a mixture of adipic acid and terephthalic acid, and 3-methylpentanediol In the case of polyester diol composed of 1,4-cyclohexanedimethanol, 500 to 5000 (weight average molecular weight) is preferable.
 前記成分Cは、1分子中に2個のイソシアネート基を有する脂肪族又は脂環族のジイソシアネート化合物が用いられる。このジイソシアネートとしては、例えば、テトラメチレンジイソシアネート、2,2,4(2,4,4)-1,6-ヘキサメチレンジイソシアネート、イソホロンジイソシアネート、4,4’-ジシクロヘキシルメタンジイソシアネート、1,4’-シクロヘキシルジイソシアネート等を挙げることができる。ジイソシアネート成分としては、イソホロンジイソシアネートが物性及びコストの点で好ましい。上記の成分A~Cを反応させる場合のアクリル重合体、ポリエステルポリオールおよび後述する鎖延長剤の合計の水酸基(アミノ基の場合もある)と、イソシアネート基の当量比はイソシアネート基が過剰となるようにする。 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 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 to the isocyanate group is such that the isocyanate group becomes excessive. To.
 上記の三成分A、B、Cを60~120℃で2~10時間程度反応させると、ジイソシアネートのイソシアネート基がポリエステルポリオール末端の水酸基と反応してポリエステルウレタン樹脂成分が形成されると共にアクリル重合体末端の水酸基にジイソシアネートが付加した化合物も混在し、過剰のイソシアネート基及び水酸基が残存した状態のプレポリマーが形成される。このプレポリマーに鎖延長剤として、例えば、イソホロンジアミン、ヘキサメチレンジアミン等のジアミンを加えてイソシアネート基を前記鎖延長剤と反応させ、鎖延長することでアクリル重合体成分がポリエステルウレタンの分子中に導入され、末端に水酸基を有する(i)のアクリル-ポリエステルウレタン共重合体を得ることができる。 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 diisocyanate is added to the terminal hydroxyl group is also mixed, and a prepolymer is formed in a state where excess isocyanate group and hydroxyl group 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.
 (i)のアクリル-ポリエステルウレタン共重合体に、(ii)のイソシアネートを加えると共に、塗布法、乾燥後の塗布量を考慮して必要な粘度に調節した塗布液となし、グラビアコート法、ロールコート法等の周知の塗布法で塗布することにより前記プライマー層を形成すればよいものである。また、(ii)のイソシアネートとしては、(i)のアクリル-ポリエステルウレタン共重合体の水酸基と反応して架橋硬化させることが可能なものであればよく、たとえば、2価以上の脂肪族ないし芳香族イソシアネートが使用でき、特に熱変色防止、耐候性の点から脂肪族イソシアネートが望ましい。具体的には、トリレンジイソシアネート、キシリレンジイソシアネート、4,4’-ジシクロヘキシルメタンジイソシアネート、ヘキサメチレンジイソシアネート、リジンジイソシアネートの単量体、これらの2量体、3量体などの多量体、或いは、これらのイソシアネートをポリオールに付加した誘導体(アダクト体)のようなポリイソシアネートなどを挙げることができる。 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 primer layer may be formed by coating by a known coating method such as a coating method. The isocyanate of (ii) is not limited as long as it can react with the hydroxyl group of the acrylic-polyester urethane copolymer of (i) and can be crosslinked and cured. An aliphatic isocyanate can be used, and an aliphatic isocyanate is particularly desirable from the viewpoint of thermal discoloration prevention and weather resistance. Specifically, tolylene diisocyanate, xylylene diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, lysine diisocyanate monomers, dimers, trimers and other multimers, or these And polyisocyanates such as derivatives (adducts) obtained by adding the above isocyanate to a polyol.
 なお、前記プライマー層の乾燥後の塗布量としては、1~20g/mであり、好ましくは1~5g/mである。また、前記プライマー層は、必要に応じてシリカ粉末などの充填剤、光安定剤、着色剤等の添加剤を添加した層としてもよいものである。 The coating amount of the primer layer after drying is 1 to 20 g / m 2 , preferably 1 to 5 g / m 2 . Moreover, the said primer layer is good also as a layer which added additives, such as fillers, such as a silica powder, a light stabilizer, and a coloring agent, as needed.
 上記防湿シートを木質基材に積層する際は、公知の接着剤が使用できる。接着剤としては、例えば、ポリ酢酸ビニル、ポリ塩化ビニル、塩化ビニル・酢酸ビニル共重合体、エチレン・アクリル酸共重合体、アイオノマー、ブタジエン・アクリルニトリルゴム、ネオプレンゴム、天然ゴム等を有効成分とする接着剤が挙げられる。接着剤層の厚さは限定的ではないが、0.1~50μm程度が好ましい。 When laminating the moisture-proof sheet on a wooden substrate, a known adhesive can be used. Examples of the adhesive include polyvinyl acetate, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ionomer, butadiene / acrylonitrile rubber, neoprene rubber, natural rubber, and the like as active ingredients. Adhesives to be used. The thickness of the adhesive layer is not limited, but is preferably about 0.1 to 50 μm.
 本発明の床用化粧材は、透湿度が7g/m・24時間以下である防湿フィルムを有することにより、木質基材裏面の透湿性が低く抑えられている。そのため、木質基材として1%含水率変化当たりの寸法変化量が0.02%よりも大きいラワン代替材料を用いてそのおもて面に透湿性の低い化粧シートを積層した場合でも、木質基材のおもて面と裏面の透湿性を同程度に設定することができるため、床用化粧材の反りや引き曲がりの発生が十分に抑制されている。このような本発明の床用化粧材は、各種建築物の床面に施工する床用化粧材及び特殊用途として床暖房用途に用いる床用化粧材として適している。 Since the floor decorative material of the present invention has a moisture-proof film having a moisture permeability of 7 g / m 2 · 24 hours or less, the moisture permeability of the back surface of the wooden substrate is suppressed to a low level. Therefore, even when a laminating substitute material with a dimensional change per 1% moisture content change larger than 0.02% is used as a wooden base material and a decorative sheet with low moisture permeability is laminated on the front surface, the wooden base Since the moisture permeability of the front surface and the back surface of the material can be set to the same level, the occurrence of warping and bending of the floor decorative material is sufficiently suppressed. Such a flooring material of the present invention is suitable as a flooring material to be constructed on the floor surface of various buildings and as a flooring material used for floor heating as a special application.
本発明の床用化粧材の模式図(一例)である。It is a schematic diagram (an example) of the decorative material for floors of the present invention. 床用化粧材の反り及び曳き曲がりを示す模式図である。It is a schematic diagram which shows the curvature and curving of the decorative material for floors. 木質基材の平均含水率及び含水率差の測定に用いるサンプルを示す図である。It is a figure which shows the sample used for the measurement of the average moisture content of a wooden base material, and a moisture content difference. 床暖房システム試験基準IIの模式図である。It is a schematic diagram of floor heating system test standard II.
1.化粧シート
2.接着剤層
3.木質基材(ラワン代替材料)
4.接着剤層
5.防湿フィルム
1. Cosmetic sheet 2. 2. Adhesive layer Wood base material (Lawan alternative material)
4). 4. Adhesive layer Moisture barrier film
 以下に実施例及び比較例を示して本発明をより詳しく説明する。但し、本発明は実施例に限定されない。 Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples. However, the present invention is not limited to the examples.
 実施例1
(1)合成樹脂層を含む化粧シート(0.4mm)を、中央理化工業製接着剤(BA-10L/BA-11B,9g/尺角)を用いて5.5mm厚のMDF(木質基材)のおもて面に貼り合わせた。当該MDFの1%含水率変化当たりの寸法変化率は0.05%であった。なお、尺角とは、縦303mm×横303mmで表される平面の面積を示す(以下同じ)。
(2)MDFの裏面に、中央理化工業製接着剤(BA-10L/BA-11B,9g/尺角)を用いて防湿フィルムを貼り合わせた。この状態の積層体を化粧板と称する。
(3)化粧板をギャングソーで縦313mm×横1840mmの大きさにカットした。
(4)また、テノーナ加工機にて、サネ加工、端部面取り加工及びV溝加工(V溝加工幅は1.5mm幅)を行った。
(5)更に、塗装ラインにて、サネ加工部、端部面取り部及びV溝加工部に塗料を塗布(塗料:2液硬化型ウレタン樹脂を含む塗料)した。
Example 1
(1) A decorative sheet (0.4 mm) containing a synthetic resin layer is used to make a 5.5 mm thick MDF (woody base material) using an adhesive (BA-10L / BA-11B, 9 g / scale angle) manufactured by Chuo Rika Kogyo. Affixed to the front surface. The dimensional change rate per 1% change in moisture content of the MDF was 0.05%. In addition, the ergonal angle indicates the area of a plane represented by 303 mm in length × 303 mm in width (the same applies hereinafter).
(2) A moisture-proof film was bonded to the back surface of the MDF using an adhesive (BA-10L / BA-11B, 9 g / scale angle) manufactured by Chuo Rika Kogyo. The laminate in this state is referred to as a decorative board.
(3) The decorative board was cut into a size of 313 mm long × 1840 mm wide with a gang saw.
(4) Further, with a tenona processing machine, sag processing, end chamfering processing and V-groove processing (V-groove processing width is 1.5 mm width) were performed.
(5) Further, a paint was applied to the sanitized part, the end chamfered part, and the V-grooved part on the coating line (paint: a paint containing a two-component curable urethane resin).
 以上の工程を経て床用化粧材を作製した。 The floor decorative material was produced through the above steps.
 防湿フィルムの作製は次の通りとした。即ち、12μm厚さの二軸延伸ポリエチレンテレフタレートフィルムを用意し、片面に2液硬化型ウレタン系樹脂からなるプライマー層を設けた。更にプライマー層の上にアルミニウム蒸着層を設けた。これにより得られるフィルムを「蒸着PETフィルム」と呼称する。 The production of the moisture-proof film was as follows. That is, a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm was prepared, and a primer layer made of a two-component curable urethane resin was provided on one side. Furthermore, the aluminum vapor deposition layer was provided on the primer layer. The film thus obtained is referred to as “deposited PET film”.
 前記蒸着PETフィルム上にPVA/シリケート系からなる表面コート層を0.2g/m(乾燥状態)を形成し、積層体(合成樹脂製基材層(PET)/蒸着層/表面コート層)を作製した。前記積層体の両面を、コロナ放電処理した後、主剤(ウレタン樹脂及び硝化綿系樹脂の混合物)に硬化剤(イソシアネート)を添加した2液硬化型樹脂をグラビア印刷法にてそれぞれ固形分として5g/mの塗布量で塗布し、接着用プライマー層を両面に形成した。これにより防湿フィルム(透湿度1g/m・24時間)を得た。 A 0.2 g / m 2 (dry state) surface coat layer made of PVA / silicate system is formed on the deposited PET film, and a laminate (synthetic resin substrate layer (PET) / deposition layer / surface coat layer) is formed. Was made. After the corona discharge treatment on both sides of the laminate, 2 g of a two-part curable resin obtained by adding a curing agent (isocyanate) to the main agent (mixture of urethane resin and nitrified cotton-based resin) as a solid content by gravure printing method The adhesive primer layer was formed on both sides by applying at a coating amount of / m 2 . As a result, a moisture-proof film (moisture permeability of 1 g / m 2 · 24 hours) was obtained.
 実施例2
 木質基材として9mm厚のパーティクルボード(1%含水率変化当たりの寸法変化率は0.049%)を用いた以外は実施例1と同様にして床用化粧材を作製した。
Example 2
A floor decorative material was prepared in the same manner as in Example 1 except that a 9 mm thick particle board (0.09% dimensional change per 1% moisture content change) was used as the wooden substrate.
 実施例3
 木質基材として12mm厚の針葉樹合板(ラジアータパイン、1%含水率変化当たりの寸法変化率は0.026%)を用いた以外は実施例1と同様にして床用化粧材を作製した。
Example 3
A flooring decorative material was produced in the same manner as in Example 1 except that 12 mm thick softwood plywood (radiata pine, dimensional change rate per 1% moisture content change was 0.026%) was used as the wooden substrate.
 実施例4
 防湿フィルムとしてPE(ポリエチレンシート。透湿度7g/m・24時間)を用いた以外は実施例1と同様にして床用化粧材を作製した。
Example 4
A flooring decorative material was prepared in the same manner as in Example 1 except that PE (polyethylene sheet, moisture permeability 7 g / m 2 · 24 hours) was used as the moisture-proof film.
 比較例1
 防湿フィルムを用いない以外は実施例1と同様にして床用化粧材を作製した。
Comparative Example 1
A flooring decorative material was prepared in the same manner as in Example 1 except that the moisture-proof film was not used.
 比較例2
 防湿フィルムを用いない以外は実施例2と同様にして床用化粧材を作製した。
Comparative Example 2
A flooring decorative material was produced in the same manner as in Example 2 except that the moisture-proof film was not used.
 比較例3
 防湿フィルムを用いない以外は実施例3と同様にして床用化粧材を作製した。
Comparative Example 3
A flooring decorative material was prepared in the same manner as in Example 3 except that the moisture-proof film was not used.
 比較例4
 防湿フィルムとして防湿紙(ポリエチレンを芯層とし、その両面を紙で積層したもの。透湿度10g/m・24時間)を用いた以外は実施例1と同様にして床用化粧材を作製した。
Comparative Example 4
A floor decorative material was prepared in the same manner as in Example 1 except that a moisture-proof paper (polyethylene as a core layer and laminated on both sides with paper. Moisture permeability of 10 g / m 2 · 24 hours) was used as the moisture-proof film. .
 従来例1
 木質基材として12mm厚のラワン合板(1%含水率変化当たりの寸法変化率は0.016%)を使用し、防湿フィルムを用いない以外は実施例1と同様にして床用化粧材を作製した。
Conventional Example 1
A floor decorative material is produced in the same manner as in Example 1 except that a 12 mm thick lauan plywood (a dimensional change rate per 1% moisture content change is 0.016%) is used as a wooden substrate, and a moisture-proof film is not used. did.
 試験例1(40℃雰囲気での反りと曳き曲がり)
 実施例1~4、比較例1~4及び従来例1で作製した床用化粧材を40℃雰囲気(dry雰囲気)中に放置(7日間)し、床用化粧材の反り量と曳き曲がり量を測定した。
Test example 1 (warp and bend in a 40 ° C atmosphere)
The floor decorative materials produced in Examples 1 to 4, Comparative Examples 1 to 4 and Conventional Example 1 are left in a 40 ° C. atmosphere (dry atmosphere) (for 7 days) to warp and curl the floor decorative material. Was measured.
 反り量と曳き曲がり量の模式図を図2に示す。反り量と曳き曲がり量は隙間ゲージで測定した。反り量が20mm/1840mm(横長さに対する反り量)以下は合格(実用に適する)である。また、曳き曲がり量0.3mm/1840mm(横長さに対する曳き曲がり量)以下が合格(実用に適する)である。結果を表1に示す。 Fig. 2 shows a schematic diagram of the amount of warpage and the amount of bending. The amount of warpage and the amount of bending were measured with a gap gauge. A warp amount of 20 mm / 1840 mm (a warp amount with respect to the horizontal length) or less is acceptable (suitable for practical use). In addition, a bending curve of 0.3 mm / 1840 mm (a bending curve with respect to the horizontal length) or less is acceptable (suitable for practical use). The results are shown in Table 1.
 試験例2(40℃、90%RH雰囲気での反りと曳き曲がり)
 実施例及び比較例で作製した床用化粧材を40℃、90%RH雰囲気中に放置(7日間)し、試験例1と同様にして床用化粧材の反り量と曳き曲がり量を測定した。結果を表1に示す。
Test example 2 (warp and bend in a 40 ° C., 90% RH atmosphere)
The floor decorative materials produced in the examples and comparative examples were left in an atmosphere of 40 ° C. and 90% RH (for 7 days), and the amount of warping and bending of the floor decorative material was measured in the same manner as in Test Example 1. . The results are shown in Table 1.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
 上記表1の結果から明らかなように、透湿度が7g/m・24時間以下である防湿フィルムを設けた本発明の床用化粧材は、防湿フィルムの存在により木質基材の湿度による寸法変化が効果的に抑制されている。その結果、床用化粧材の反りや曳き曲がりが防止され、従来例1(ラワン合板使用)の試験結果により近づいた結果となっている。 As is clear from the results in Table 1 above, the floor decorative material of the present invention provided with a moisture-proof film having a moisture permeability of 7 g / m 2 · 24 hours or less is a dimension due to the humidity of the wooden substrate due to the presence of the moisture-proof film. Changes are effectively suppressed. As a result, warping and curving of the floor decorative material are prevented, and the test results of Conventional Example 1 (using Lauan plywood) are closer.
 実施例5
(1)フロア用化粧シート(0.16mm厚、透湿度:3g/m2・24時間)を、中央理化工業製接着剤(BA-10L/BA-11B,9g/尺角)を用いて12mm厚のパーティクルボード(PB)(木質基材)のおもて面に貼り合わせた。当該PBの1%含水率変化当たりの寸法変化率は0.045%であり、平均含水率は6.5重量%であった。
(2)PBの裏面に、中央理化工業製接着剤(BA-10L/BA-11B,9g/尺角)を用いて防湿フィルム(PETフィルム+蒸着層、透湿度:3g/m2・24時間)を貼り合わせた。この状態の積層体を化粧板と称する。
(3)化粧板をギャングソーで縦313mm×横1840mmの大きさにカットした。
(4)また、テノーナ加工機にて、サネ加工、端部面取り加工及びV溝加工(V溝加工幅は1.5mm幅)を行った。
(5)更に、塗装ラインにて、サネ加工部、端部面取り部及びV溝加工部に塗料を塗布(塗料:2液硬化型ウレタン樹脂を含む塗料)した。
Example 5
(1) Floor decorative sheet (0.16mm thickness, water vapor transmission rate: 3g / m 2 · 24 hours) is 12mm thick using Chuo Rika Industries adhesive (BA-10L / BA-11B, 9g / scale angle) The particle board (PB) (woody base material) was bonded to the front surface. The dimensional change rate per 1% moisture content change of the PB was 0.045%, and the average moisture content was 6.5% by weight.
(2) Moisture-proof film (PET film + vapor deposition layer, water vapor transmission rate: 3g / m 2 · 24 hours) using adhesive (BA-10L / BA-11B, 9g / scale angle) manufactured by Chuo Rika Kogyo Co., Ltd. ). The laminate in this state is referred to as a decorative board.
(3) The decorative board was cut into a size of 313 mm long × 1840 mm wide with a gang saw.
(4) Further, with a tenona processing machine, sag processing, end chamfering processing and V-groove processing (V-groove processing width is 1.5 mm width) were performed.
(5) Further, a paint was applied to the sanitized part, the end chamfered part, and the V-grooved part on the coating line (paint: a paint containing a two-component curable urethane resin).
 以上の工程を経て床用化粧材を作製した。なお、各工程間では化粧板をPPフィルム(30μm厚、透湿度15g)で包んで防湿処理した。 The floor decorative material was produced through the above steps. In addition, between each process, the decorative board was wrapped in PP film (30 micrometers thickness, water vapor transmission rate 15g), and the moisture-proof process was carried out.
 実施例6
 各工程間でPPフィルムを用いた防湿処理をしない以外は、実施例5と同様に床用化粧材を作製した。これにより、木質基材の周辺部の含水率を中央部よりも高くした。
Example 6
A flooring decorative material was produced in the same manner as in Example 5 except that the moisture-proof treatment using the PP film was not performed between the steps. Thereby, the moisture content of the peripheral part of a wooden base material was made higher than the center part.
 実施例7
 木質基材の中央部の含水率が周辺部より2%高いPB基材を使用した以外は、実施例5と同様に床用化粧材を作製した。
Example 7
A flooring decorative material was prepared in the same manner as in Example 5 except that a PB base material having a moisture content of 2% higher than that of the peripheral part was used in the central part of the wooden base material.
 実施例8
 木質基材の中央部の含水率が周辺部より1.7%高い針葉樹合板を使用した以外は、実施例5と同様に床用化粧材を作製した。
Example 8
A flooring decorative material was prepared in the same manner as in Example 5 except that a softwood plywood having a moisture content of 1.7% higher than that of the peripheral part was used in the central part of the wooden substrate.
 比較例5
 木質基材として平均含水率が5.5%のPBを使用した以外は、実施例6と同様にして床用化粧材を作製した。
Comparative Example 5
A flooring decorative material was produced in the same manner as in Example 6 except that PB having an average moisture content of 5.5% was used as the wooden substrate.
 比較例6
 テノーナ加工後に防湿処理をせずに1週間放置した以外は、実施例6と同様に床用化粧材を作製した。
Comparative Example 6
A flooring decorative material was produced in the same manner as in Example 6 except that after tenon processing, the sample was left for one week without being subjected to moisture-proof treatment.
 比較例7
 木質中央部の含水率が周辺部より2.5%高いPB基材を使用した以外は、実施例5と同様に床用化粧材を作製した。
Comparative Example 7
A flooring decorative material was produced in the same manner as in Example 5 except that a PB base material having a moisture content of 2.5% higher than that of the peripheral part was used.
 比較例8
 平均含水率を10.5%に調整し、木質中央部の含水率が周辺部より1.3%低いPB基材を使用した以外は、実施例5と同様に床用化粧材を作製した。
Comparative Example 8
A floor decorative material was prepared in the same manner as in Example 5 except that the average moisture content was adjusted to 10.5% and a PB base material having a moisture content at the center of the wood of 1.3% lower than the peripheral portion was used.
 試験例3(床用化粧材をカット後の曳き曲がり及び施工適性評価)
<カット後の曳き曲がり量評価>
 実施例5~8及び比較例5~8で作製した床用化粧材(縦313mm×横1840mm)を、中央部で約半分(縦150mm×横1840mm)にカットした。
Test Example 3 (Evaluation of bendability and construction suitability after cutting a flooring decorative material)
<Evaluation of amount of curving after cutting>
The floor decorative material (313 mm long × 1840 mm wide) produced in Examples 5 to 8 and Comparative Examples 5 to 8 was cut into about half (150 mm long × 1840 mm wide) at the center.
 カットされた床材を直線定規とスキマゲージを用いて横方向の曳き曲がり量を測定した。測定はカット後30分以内に行った。曳き曲がり量は、各サネ側(オスサネ、メスサネ)が凸になる状態を+表示とした。 The amount of lateral bending of the cut flooring was measured using a straight ruler and a gap gauge. The measurement was performed within 30 minutes after cutting. As for the amount of bending, the state where each sane side (male sane, female sane) is convex is defined as + display.
 なお、カット後の曳き曲がり量は「-1.0mm/横1840mm~+0.7mm/横1840mm」の範囲であれば許容される。 It should be noted that the amount of bending after cutting is allowable in the range of “-1.0mm / width 1840mm to + 0.7mm / width 1840mm”.
<施工適性評価>
 実施例5~8及び比較例5~8で作製した床用化粧材(縦313mm×横1840mm)を、そのままの大きさで先ず施工した。その後、中央部で約半分(縦150mm×横1840mm)にカットした床用化粧材をカット後30分以内に施工し、カット後の施工適性を評価した。評価基準は次の通りとした。
 ○:カット前と同様に、問題なく施工でき、継ぎ目に隙間が認められない。
 △:手間をかければ何とか施工でき、継ぎ目に隙間は認められない。
 ×:施工が困難である上、継ぎ目に0.3mmを超える隙間が認められる。
<Evaluation of construction aptitude>
The floor decorative materials (313 mm long × 1840 mm wide) produced in Examples 5 to 8 and Comparative Examples 5 to 8 were first applied in the same size. Then, the floor decorative material cut into about a half (150 mm x 1840 mm) at the center was applied within 30 minutes after cutting, and the suitability after cutting was evaluated. The evaluation criteria were as follows.
○: As with the case before cutting, construction can be performed without any problem, and no gap is observed at the joint.
(Triangle | delta): If it takes an effort, it can somehow be constructed, and a clearance gap is not recognized by a joint.
X: Construction is difficult, and a gap exceeding 0.3 mm is observed at the joint.
 試験例4(床暖房システム試験)
 実施例5~8及び比較例5~8で作製した床用化粧材(縦313mm×横1840mm)を、床暖房システム試験に供した。床暖房システムは部屋の隅部分(壁際又は柱の周辺)には一般に施工されず、隅部分を除く部屋の中心部に施工される。よって、試験例4では、床用化粧材(縦313mm×横1840mm)について床暖房システム試験を行った。
Test example 4 (floor heating system test)
The floor decorative materials (313 mm long × 1840 mm wide) produced in Examples 5 to 8 and Comparative Examples 5 to 8 were subjected to a floor heating system test. The floor heating system is generally not installed at the corners of the room (by the walls or around the columns), but at the center of the room excluding the corners. Therefore, in Test Example 4, a floor heating system test was performed on a floor decorative material (length 313 mm × width 1840 mm).
 具体的には、床用化粧材をサネ組み施工したものを試験片とし、図4に示される床暖房システム試験(仕上げ材・下地材編「II.耐久性能 熱耐久試験」80℃温水×1100時間連続通湯、ガス会社統一基準方式)に供した。 More specifically, the floor heating system test shown in FIG. 4 (finishing material / base material “II. Durability Performance Thermal Durability Test” 80 ° C. hot water × 1100 is used as a test piece. Continuous hot water and gas company standard system).
 試験後の試験片について、
(1)サネ組み部分(勘合部)の隙間変位量が0.5mm以下であれば合格
(2)サネ組み部分(勘合部)の段差変位量が0.5mm以下であれば合格
(3)横方向(1840mm)の反り(=幅反り)量が1mm未満であれば合格
の基準に従って評価を行った。全て合格であるものと○とし、一つでも満たさない要件があるものを×とした。
About the test piece after the test,
(1) Pass if the gap displacement of the steel assembling part (fitting part) is 0.5 mm or less (2) Pass if the step displacement of the sash assembling part (fitting part) is 0.5 mm or less (3) Horizontal If the amount of warpage (= width warpage) in the direction (1840 mm) was less than 1 mm, the evaluation was made according to the acceptance criteria. Those that passed all were marked as ◯, and those that did not satisfy even one were marked as x.
 各評価・試験結果を下記表2に示す。 Each evaluation / test result is shown in Table 2 below.
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
 上記表2の結果から明らかなように、特に平均含水率が6~10重量%であり、且つ中央部の含水率が周辺部の含水率と比較して-1%~+2%の範囲である木質基材を用いることにより、カット後の曳き曲がりを効果的に抑制することができる。また、本発明の床用化粧材は、防湿フィルムの透湿度が7g/m・24時間以下であることにより、床暖房用床材としても実用に供することができる。 As is apparent from the results in Table 2 above, the average moisture content is particularly 6 to 10% by weight, and the moisture content in the central part is in the range of -1% to + 2% compared to the moisture content in the peripheral part. By using the woody base material, it is possible to effectively suppress the bending after cutting. Moreover, the floor decorative material of the present invention can be put to practical use as a floor heating floor material when the moisture permeability of the moisture-proof film is 7 g / m 2 · 24 hours or less.

Claims (9)

  1.  木質基材のおもて面に化粧シートが積層されており、前記木質基材の裏面に防湿フィルムが積層されている床用化粧材であって、
    (1)前記木質基材は、1%含水率変化当たりの寸法変化量が0.02%よりも大きく、
    (2)前記防湿フィルムは、透湿度が7g/m・24時間以下である
    ことを特徴とする床用化粧材。
    A decorative sheet for flooring in which a decorative sheet is laminated on the front surface of the wooden substrate, and a moisture-proof film is laminated on the back surface of the wooden substrate,
    (1) The wooden base material has a dimensional change per 1% moisture content change larger than 0.02%,
    (2) The moisture-proof film has a moisture permeability of 7 g / m 2 · 24 hours or less.
  2.  木質基材のおもて面に化粧シートが積層されており、前記木質基材の裏面に防湿フィルムが積層されている床用化粧材であって、
    (1)前記木質基材は、1%含水率変化当たりの寸法変化量が0.02%よりも大きく、
    (2)前記防湿フィルムは、透湿度が7g/m・24時間以下であり、
    (3)前記木質基材は、平均含水率が6~10重量%であり、且つ中央部の含水率が周辺部の含水率と比較して-1%~+2%の範囲である
    ことを特徴とする床用化粧材。
    A decorative sheet for flooring in which a decorative sheet is laminated on the front surface of the wooden substrate, and a moisture-proof film is laminated on the back surface of the wooden substrate,
    (1) The wooden base material has a dimensional change per 1% moisture content change larger than 0.02%,
    (2) The moisture-proof film has a moisture permeability of 7 g / m 2 · 24 hours or less,
    (3) The wood base material has an average moisture content of 6 to 10% by weight, and a moisture content in a central part is in a range of -1% to + 2% as compared with a moisture content in a peripheral part. Flooring cosmetics.
  3.  前記木質基材は、中密度木質繊維板(MDF)、高密度木質繊維板(HDF)、パーティクルボード(PB)、針葉樹合板及び早成樹合板からなる群から選択される少なくとも1種である、請求項1又は2に記載の床用化粧材。 The wood base material is at least one selected from the group consisting of medium density wood fiber board (MDF), high density wood fiber board (HDF), particle board (PB), softwood plywood, and early-wood plywood. Item 3. A floor decorative material according to Item 1 or 2.
  4.  前記防湿フィルムは、少なくとも合成樹脂製基材層と蒸着層とを有する、請求項1又は2に記載の床用化粧材。 The floor moisture-proof material according to claim 1 or 2, wherein the moisture-proof film has at least a synthetic resin base material layer and a vapor deposition layer.
  5.  前記防湿フィルムは、前記合成樹脂製基材層と前記蒸着層との間にプライマー層を有する、請求項4に記載の床用化粧材。 5. The floor decorative material according to claim 4, wherein the moisture-proof film has a primer layer between the synthetic resin base material layer and the vapor deposition layer.
  6.  前記防湿フィルムは、前記合成樹脂製基材層/プライマー層/前記蒸着層/表面コート層からなる、請求項4に記載の床用化粧材。 5. The floor decorative material according to claim 4, wherein the moisture-proof film is composed of the synthetic resin base layer / primer layer / deposition layer / surface coat layer.
  7.  前記防湿フィルムの片面又は両面に更にプライマー層を有する、請求項4に記載の床用化粧材。 The flooring decorative material according to claim 4, further comprising a primer layer on one or both sides of the moisture-proof film.
  8.  前記化粧シート及び前記防湿フィルムは、接着剤により前記木質基材に積層されている、請求項1又は2に記載の床用化粧材。 The floor decorative material according to claim 1 or 2, wherein the decorative sheet and the moisture-proof film are laminated on the wooden base material with an adhesive.
  9.  床暖房用床材である、請求項1又は2に記載の床用化粧材。 The floor decorative material according to claim 1, which is a floor heating floor material.
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