JP2009097325A - Decoration material for flooring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decoration material for flooring having excellent resistance to damages and impacts, the good feel of walking thereon and stable mass production in addition to caster resistance property. <P>SOLUTION: The decoration material for flooring laminates decoration sheets layered on a woody base material. The decoration material has the surface hardness less than 60 when being measured from the decoration sheet side with a durometer of type D in accordance with the provisions of JIS K 6253. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a floor decorative material.

  Conventionally, as a flooring material for a detached house or a condominium / apartment, for example, natural wood having a thickness of about several hundred μm to several mm is sliced on a wooden base material such as a lauan plywood having a thickness of about 6 to 15 mm. A veneer with a veneer bonded together and further coated with a veneer surface is widely used. Such a natural wood floor material can be painted, polished and painted repeatedly to achieve a smooth finish with a sense of depth, and a beautiful design with a very painted feeling can be obtained.

  However, today, it is difficult to stably mass-produce floor materials using natural wood from the viewpoint of lack of wood resources worldwide.

  In view of these problems, for example, flooring has been proposed in which a decorative sheet having an appearance close to that of natural wood is printed on a wooden substrate by printing a wood grain pattern or the like. The flooring can be stably mass-produced.

  However, the floor material has insufficient castor resistance. In order to solve such a problem of caster resistance, a hard sheet layer having a surface hardness of 60 or more in the durometer hardness test type D (JIS K 6253) is provided between the wooden base material and the decorative sheet. A flooring material has been proposed (Patent Document 1).

  However, the flooring of Patent Document 1 is inferior in scratch resistance and impact resistance. Moreover, it lacks cushioning properties and is inferior in walking ability.

Therefore, development of a floor covering material that is excellent in scratch resistance, impact resistance, and walking feeling in addition to caster resistance and that can be stably mass-produced is eagerly desired.
JP2003-11277A

  The main object of the present invention is to provide a floor decorative material which is excellent in scratch resistance, impact resistance and walking feeling in addition to caster resistance and which can be stably mass-produced.

  As a result of intensive research, the inventor is a floor decorative material obtained by laminating a decorative sheet on a wooden substrate, and the surface hardness of the floor decorative material measured from the decorative sheet side is within a specific range. As a result, the inventors have found that the above object can be achieved, and have completed the present invention.

That is, the present invention relates to the following floor decorative material.
1. It is a decorative material for floor made by laminating a decorative sheet on a wooden substrate,
In accordance with JIS K 6253, a floor decorative material having a surface hardness of less than 60 when measured from the decorative sheet side using a type D durometer.
2. Item 2. The intermediate layer according to Item 1, comprising an intermediate layer having a surface hardness of less than 60 when measured using a type D durometer, according to JIS K 6253, between the wooden substrate and the decorative sheet. Flooring cosmetics.
3. Item 3. The floor decorative material according to Item 2, wherein the intermediate layer is a polyethylene resin layer.
4). Any of the above items 1 to 3, wherein the decorative sheet is a laminate in which a pattern layer, a transparent adhesive layer, a transparent resin layer, and a transparent surface protective layer are sequentially laminated on a resin sheet. The floor decorative material as described.
5. Item 5. The floor decorative material according to Item 4, wherein the intermediate layer is a polyethylene resin layer and the resin sheet is a polyethylene sheet.
6). Item 6. The floor decorative material according to Item 4 or 5, wherein the transparent surface protective layer is an ionizing radiation curable resin layer obtained by curing and curing an ionizing radiation curable resin.

  The flooring decorative material of the present invention is a flooring decorative material obtained by laminating a decorative sheet on a wooden base material, and from the decorative sheet side using a type D durometer according to the provisions of JIS K 6253. The surface hardness when measured is less than 60.

Surface hardness of the decorative material for flooring The decorative material for flooring of the present invention has a surface hardness of less than 60, preferably 25 to 59, more preferably measured using a type D durometer according to JIS K 6253. 45-59.

  By making the surface hardness less than 60, it is possible to obtain a decorative material for flooring excellent in walking feeling. Moreover, the scratch resistance and impact resistance of the decorative material for floors can be improved.

  In the present specification, “excellent in walking feeling” means having excellent cushioning properties that are excellent in load dispersibility and can sufficiently reduce the load on the sole.

  The floor decorative material of the present invention is also excellent in caster resistance. In particular, when the surface hardness is 45 or more, castor resistance can be suitably imparted to the flooring decorative material.

  The surface hardness is measured using a type D durometer in accordance with JIS K 6253. Specifically, by pressing the pressing needle and pressure surface of the type D durometer against the decorative sheet side of the decorative material for flooring, and measuring the amount of movement of the pressing needle when the pressing needle gets stuck in the decorative material, Determine the surface hardness.

  The surface hardness of the floor decorative material can be adjusted to the above range by appropriately setting the type of resin used, the layer configuration, and the like. In particular, the floor decorative material of the present invention having the above surface hardness is a surface when measured using a type D durometer between the wooden base material and the decorative sheet according to JIS K 6253. A preferred embodiment is a flooring decorative material having a sheet having a hardness of less than 60 (hereinafter sometimes abbreviated as “intermediate layer”).

Intermediate layer The floor decorative material of the present invention has a surface hardness of less than 60 when measured using a type D durometer according to the provisions of JIS K 6253 between the wooden base material and the decorative sheet. Preferably has an intermediate layer that is 25-59, more preferably 45-59. The surface hardness can be measured by laminating an intermediate layer on a wooden substrate.

  For the formation of the intermediate layer, for example, polyethylene (low density polyethylene, linear low density polyethylene, high density polyethylene), polypropylene, polybutene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer. A polyolefin resin such as a polymer and an ethylene-propylene-butene copolymer can be used. These can be used alone or in combination of two or more. In particular, it is preferable to use polyethylene as the resin. When polyethylene is used, the fluffing of the processed surface of the intermediate layer can be suppressed when the floor decorative material is grooved or chamfered.

  When using the polyolefin resin, various elastomers typified by a polyolefin thermoplastic elastomer may be further added as necessary. The surface hardness of the intermediate layer can be suitably adjusted by adding the elastomer.

  In addition to the polyolefin resin, polyester resin (for example, amorphous polyethylene terephthalate, amorphous PET copolymer, polybutylene terephthalate, etc.), polymethyl methacrylate, polystyrene, polycarbonate, acrylonitrile-butadiene-styrene resin. (ABS) or the like can also be used.

  The amorphous PET copolymer is a resin obtained by copolymerizing terephthalic acid and 1,4 cyclohexanedimethanol. As a commercial item, brand name "PET-G" (made by Eastman) is mentioned, for example.

  When using a resin other than the polyolefin-based resin as described above, a known additive may be added or the ratio of the monomer component in the resin may be adjusted as necessary.

  The intermediate layer can be produced, for example, by molding a resin composition containing the polyolefin resin or the like into a sheet (film) by, for example, a calendar method, an inflation method, a T-die extrusion method, or the like.

  The thickness of the intermediate layer is preferably 50 to 500 μm, more preferably 200 to 400 μm.

Wood base material The wood base material is not limited as long as it is suitable as a base material for a flooring decorative material. For example, a single board, a plywood, a particle board, etc. which consist of trees, such as a cedar, a bush, a pine, a lauan, and a teak, are mentioned. In addition, the wooden base material combining these two or more can also be used. In particular, as a wooden base material used in the floor decorative material of the present invention, a plywood using Lauan is preferable in that a floor decorative material having a surface hardness of less than 60 can be suitably produced.

  The shape of the wooden substrate is not particularly limited, but is usually a rectangular parallelepiped or a cube. The thickness of the wood board is not limited, but is preferably about 3 to 15 mm, more preferably about 6 to 12 mm. Moreover, the wooden base material may be subjected to sunflower processing on the side surface.

Decorative sheet The decorative material for floors of the present invention is obtained by sticking a decorative sheet on the wooden substrate (or the intermediate layer).

  Examples of the decorative sheet include a laminate obtained by sequentially forming a pattern pattern layer, a transparent adhesive layer, a transparent resin layer, and a transparent surface protective layer on a resin sheet.

  Hereinafter, the decorative sheet will be specifically described with the laminate as a representative example.

(Resin sheet)
As the resin sheet, a sheet (film) made of a polyolefin resin is preferably used.

  It does not specifically limit as polyolefin resin, What is normally used in the field | area of a decorative sheet can be used. For example, polyethylene, polypropylene, polybutene, polymethylpentene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-propylene-butene copolymer, polyolefin-based thermoplastic elastomer, etc. Is mentioned. Among these, polypropylene, polyolefin-based thermoplastic elastomers and the like are particularly preferable. Moreover, when an intermediate | middle layer is a polyethylene resin layer, it is preferable to use polyethylene also as a resin sheet. By forming both the intermediate layer and the resin sheet from polyethylene, the scratch resistance is improved by a synergistic effect, and the resin components are the same. Therefore, both layers can be easily adhered by thermal lamination.

  The resin sheet can be produced by molding the polyolefin-based resin into a sheet (film) by, for example, a calendar method, an inflation method, a T-die extrusion method, or the like.

  You may make a resin sheet contain well-known additives, such as an inorganic filler, as needed.

  The thickness of the resin sheet is not particularly limited and can be set according to product characteristics, but is usually 40 to 150 μm, preferably about 50 to 100 μm.

  One or both surfaces of the resin sheet may be subjected to a surface treatment such as a corona discharge treatment, if necessary. For example, when the corona discharge treatment is performed, the surface tension of the resin sheet surface may be 30 dyne or more, preferably 40 dyne or more. The surface treatment may be performed according to a conventional method for each treatment.

  You may provide the back surface primer layer for making the adhesion | attachment of the said base material easy in the resin sheet back surface (the said base material sticking surface). Moreover, you may provide the primer layer for printing for making formation of a pattern pattern layer easy in the upper surface (opposite surface to the said base material sticking surface) of a resin sheet.

  The said back surface primer layer and the primer layer for printing can be formed by apply | coating a well-known primer agent to the single side | surface or both surfaces of a resin sheet. As the primer agent, one obtained by dispersing a resin component in a solvent can be used. Examples of the resin component include acrylic-urethane resins and urethane-cellulose resins (for example, a resin obtained by adding hexamethylene diisocyanate to a mixture of urethane and nitrified cotton).

Although the application amount of the primer agent is not particularly limited, it is usually 0.1 to 100 g / m ² , preferably about 0.1 to 50 g / m ² .
Although the thickness after drying of the said back surface primer layer and the primer layer for printing is not specifically limited, It is 0.01-10 micrometers normally, respectively, Preferably it is about 0.1-1 micrometer.

(Pattern pattern layer)
A pattern layer is formed on the resin sheet (opposite to the wood base material sticking surface, hereinafter the same side in each layer).

  The design pattern layer imparts design properties with a desired design to the decorative sheet, and the type of design is not particularly limited. Examples thereof include a wood grain pattern, a stone pattern, a grain pattern, a tiled pattern, a brickwork pattern, a cloth pattern, a leather pattern, a geometric figure, a character, a symbol, and an abstract pattern.

  The method for forming the pattern layer is not particularly limited. For example, a colored ink or coating obtained by dissolving (or dispersing) a known colorant (dye or pigment) in a solvent (or dispersion medium) together with a binder resin. What is necessary is just to form by the printing method etc. which used the agent etc.

  Examples of the colorant include inorganic pigments such as carbon black, titanium white, zinc white, dial, bitumen, and cadmium red; azo pigments, lake pigments, anthraquinone pigments, quinacridone pigments, phthalocyanine pigments, isoindolinone pigments, dioxazine pigments. Organic pigments such as aluminum powder, metal powder pigments such as bronze powder, pearlescent pigments such as titanium oxide-coated mica and bismuth oxide chloride; fluorescent pigments; These colorants can be used alone or in admixture of two or more. These colorants may further contain fillers such as silica, extender pigments such as organic beads, neutralizing agents, surfactants and the like.

  Examples of the binder resin include acrylic resins, styrene resins, polyester resins, urethane resins, acrylic-urethane resins, chlorinated polyolefin resins, vinyl chloride-vinyl acetate copolymer resins, polyvinyl butyral resins. Alkyd resins, petroleum resins, ketone resins, epoxy resins, melamine resins, fluorine resins, silicone resins, fiber derivatives, rubber resins, and the like. These resins can be used alone or in admixture of two or more.

  Examples of the solvent (or dispersion medium) include petroleum organic solvents such as hexane, heptane, octane, toluene, xylene, ethylbenzene, cyclohexane, and methylcyclohexane; ethyl acetate, butyl acetate, 2-methoxyethyl acetate, and acetic acid-2 -Ester-based organic solvents such as ethoxyethyl; alcohol-based organic solvents such as methyl alcohol, ethyl alcohol, normal propyl alcohol, isopropyl alcohol, isobutyl alcohol, ethylene glycol, propylene glycol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone Organic solvents; ether organic solvents such as diethyl ether, dioxane, tetrahydrofuran; dichloromethane, carbon tetrachloride, trichloroethylene, tetrachloroethylene Inorganic solvents and the like, such as water; chlorinated organic solvents. These solvents (or dispersion media) are used alone or in combination of two or more.

  Examples of the printing method used for forming the pattern layer include a gravure printing method, an offset printing method, a screen printing method, a flexographic printing method, an electrostatic printing method, and an inkjet printing method. When forming a solid pattern pattern layer, for example, roll coating method, knife coating method, air knife coating method, die coating method, lip coating method, comma coating method, kiss coating method, flow coating method, dip coating Various coating methods such as a coating method may be mentioned. In addition, the hand-drawn method, the ink-sink method, the photographic method, the transfer method, the laser beam drawing method, the electron beam drawing method, the metal partial evaporation method, the etching method, etc. may be used or combined with other forming methods. Good.

  The thickness of the pattern layer is not particularly limited and can be set as appropriate according to product characteristics. The layer thickness at the time of coating is about 1 to 15 μm, and the layer thickness after drying is about 0.1 to 10 μm.

(Colored hiding layer)
A colored concealment layer may be further formed between the resin sheet and the pattern layer as necessary. The colored masking layer is provided when it is desired to mask the ground color of the adherend from the front surface of the decorative sheet. Of course, when the resin sheet is transparent, even when the resin sheet is concealed and colored, it may be formed to stabilize the concealment.

  As the ink for forming the colored masking layer, an ink for forming a pattern layer and capable of masking coloring can be used.

  As a method for forming the colored concealing layer, a method that can be formed so as to cover the entire resin sheet (entirely solid) is preferable. For example, the roll coating method, knife coating method, air knife coating method, die coating method, lip coating method, comma coating method, kiss coating method, flow coating method, dip coating method and the like described above are preferable.

  The thickness of the colored concealing layer is not particularly limited and can be set as appropriate according to the product characteristics. The layer thickness during coating is about 0.2 to 10 μm, and the layer thickness after drying is about 0.1 to 5 μm.

(Transparent adhesive layer)
A transparent adhesive layer is formed on the pattern layer. The transparent adhesive layer is not particularly limited as long as it is transparent, and includes any of transparent and colorless, colored and translucent. This adhesive layer is formed in order to bond the pattern layer and the transparent resin layer.

  It does not specifically limit as an adhesive agent, A well-known adhesive agent can be used in the field of a decorative sheet.

  Examples of the adhesive known in the field of decorative sheets include thermoplastic resins such as polyamide resin, acrylic resin and vinyl acetate resin, and curable resins such as thermosetting urethane resin. Further, a two-component curable polyurethane resin or polyester resin using isocyanate as a curing agent can also be applied.

  The adhesive layer can be formed, for example, by applying an adhesive on the pattern layer and then drying and curing. Conditions such as drying temperature and drying time are not particularly limited, and may be set as appropriate according to the type of adhesive. The method of applying the adhesive is not particularly limited, and examples thereof include roll coating, curtain flow coating, wire bar coating, reverse coating, gravure coating, gravure reverse coating, air knife coating, kiss coating, blade coating, smooth coating, and comma coating. The method can be adopted.

  Although the thickness of an adhesive bond layer is not specifically limited, The thickness after drying is 0.1-30 micrometers, Preferably it is about 1-20 micrometers.

(Transparent resin layer)
A transparent resin layer is formed on the transparent adhesive layer. The transparent resin layer includes any of colorless and transparent, colored and transparent, and translucent as long as it is transparent.

  The resin component contained in the transparent resin layer is not limited, but is preferably a thermoplastic resin, and particularly preferably polypropylene.

  The transparent resin layer can contain additives such as inorganic fillers as necessary.

  For example, the transparent resin layer is formed of a resin by a calendar method, an inflation method, a T-die extrusion method, or the like. An existing film may be used.

  The thickness of the transparent resin layer is usually about 20 to 300 μm.

  On the surface of the transparent resin layer, on which the transparent surface protective layer described later is formed, the surface of corona discharge treatment, ozone treatment, plasma treatment, ionizing radiation treatment, dichromate treatment, etc., as necessary Processing may be performed. The surface treatment may be performed according to a conventional method for each treatment.

  Moreover, you may provide a primer layer (primer layer for making formation of a surface protective layer easy) on the surface as needed.

  The primer layer can be formed by applying a known primer agent to the surface of the transparent resin layer. Examples of the primer agent include a urethane resin-based primer agent composed of an acrylic-modified urethane resin and the like, and a resin-based primer agent composed of a block copolymer of acrylic and urethane.

The application amount of the primer agent is not particularly limited, but is usually 0.1 to 100 g / m ² , preferably about 0.1 to 50 g / m ² .
Although the thickness of a primer layer is not specifically limited, Usually, 0.01-10 micrometers, Preferably it is about 0.1-1 micrometer.

(Transparent surface protective layer)
A transparent surface protective layer is formed on the transparent resin layer.

  As the transparent surface protective layer, an ionizing radiation curable resin layer obtained by crosslinking an ionizing radiation curable resin and being cured is preferable from the viewpoint of high surface hardness, productivity, and the like.

  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.

  Examples of the ionizing radiation include 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.

  As the ultraviolet light source, a light source such as 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 the ultraviolet light can be about 190 to 380 nm.

  As the electron beam source, 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 it is cured by irradiation with ultraviolet rays.

  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.

  Although the addition amount of a photoinitiator is not specifically limited, Generally it is about 0.1-10 weight part with respect to 100 weight part of ionizing radiation curable resins.

  As a method for 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 generally about 5 to 30 μm, preferably about 15 to 25 μm as a solid content.

  The transparent surface protective layer preferably contains a lubricant.

  Examples of the lubricant include alumina, diamond, silicon carbide, silica, glass, zirconia, zeolite, shirasu balloon, and diatomaceous earth. These can be used alone or in combination of two or more. The lubricant is preferably a granular material having an average particle size of about 5 to 50 μm. By appropriately adjusting the average particle size of the lubricant and the film thickness of the transparent surface protective layer, all or part of the lubricant is projected from the surface of the transparent surface protective layer, Fine convex portions can be formed on the surface of the transparent surface protective layer. By forming such fine convex portions, it is possible to suitably impart surface hardness, wear resistance, scratch resistance, slip resistance (slip resistance), and the like to the floor decorative material.

  However, if the anti-friction agent is exposed in a state of protruding on the surface of the transparent surface protective layer, there is a risk that the back of the sock of a walking person will be worn or the knee kid may be worn when the child falls. is there. Therefore, the transparent surface protective layer is composed of a plurality of layers, and the lubricant is added to a layer other than the uppermost layer, so as to cover the surface of the lubricant that protrudes from the average surface of the layer, It is desirable to provide a top layer to which no lubricant is added. In this case, the sharp surface irregularities formed by the fine protrusions due to the protrusion of the lubricant from the average surface of the transparent surface protective layer are blunted by the uppermost surface protective layer. In addition to this, it is possible to reduce roughness when touching the surface and excessive frosting (powder).

  The addition amount of the lubricant is about 1 to 80 parts by weight with respect to 100 parts by weight of the resin component.

  Although the thickness of a transparent surface protective layer is not specifically limited, About 1-15 micrometers is preferable.

  Although the thickness of the said decorative sheet is not specifically limited, About 100-200 micrometers is preferable.

Flooring decorative material The flooring decorative material of the present invention is obtained by forming the decorative sheet on the wooden substrate.

  Examples of a method for forming the decorative sheet on the wood base material or a sheet having a surface hardness of less than 60 include, for example, applying an adhesive to the base material or the sheet, and applying the adhesive sheet to the coated surface side. A method of laminating the two by applying pressure with a roll from the decorative sheet side is preferable. As the adhesive, for example, a known adhesive such as urethane-modified ethylene / vinyl acetate emulsion adhesive can be used.

It is preferable to laminate a moisture proof sheet having a moisture permeability of 3 to 30 g / m ² · 24 h on the back surface (opposite side of the decorative sheet) of the wooden base material of the floor decorative material of the present invention. By adhering the moisture-proof sheet to the back surface of the wooden substrate, the floor decorative material can be further improved in moisture resistance.

The moisture-proof sheet is not particularly limited as long as the moisture permeability is 3 to 30 g / m ² · 24 h. For example, the sheet | seat etc. which mainly consist of a moisture-proof resin layer about 10-100 micrometers in thickness and laminate | stack a paper layer on the surface and / or back surface as needed are mentioned.

  As the moisture-proof resin layer, for example, a polyolefin-based resin such as polyethylene (high-density polyethylene, low-density polyethylene), or a hydrophobic thermoplastic resin with low moisture permeability such as polyvinyl chloride resin, polyester resin, or polyvinylidene fluoride resin is used. It can be preferably used.

  Examples of the paper layer include thin paper, resin-impregnated paper, inter-paper reinforced paper, and the like.

  In the paper layer, for example, amino compounds such as dicyandiamide and melamine, amides such as urea, barbituric acid and semicarbazide hydrochloride, amino acids such as glutamic acid, glycine and alanine, hydrazobenzene, It is preferable to contain a formaldehyde scavenger represented by nitrogen-containing compounds such as hydrazine derivatives such as propionic acid hydrazide, carbohydrazide, and adipic acid dihydrazide. Thereby, the capture removal function of formaldehyde which the said wooden base material diverges can be provided suitably to the said decorative material for floors.

  If necessary, the floor decorative material of the present invention may be subjected to actual processing of four sides, provision of V-shaped grooves, etc. using a tenoner. Further, a wiping process may be performed after applying the paint. The paint is not particularly limited, but an aqueous two-component curable urethane-based colored paint is preferable.

  The floor decorative material of the present invention is excellent in walking feeling. Specifically, the floor decorative material of the present invention is excellent in load dispersibility and has cushioning properties that can sufficiently reduce the burden on the sole.

  Further, the floor decorative material of the present invention is excellent in caster resistance, scratch resistance and impact resistance.

  Furthermore, the floor decorative material of the present invention can be stably mass-produced.

  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.

Example 1
(Production of decorative sheet)
An acrylic-urethane resin (a resin obtained by adding 5 parts by weight of hexamethylene diisocyanate to 100 parts by weight of acrylic polyol) was dissolved in a mixed solvent of methyl ethyl ketone and butyl acetate on a resin sheet made of a colored polyethylene film having a thickness of 60 μm. The solution was applied by gravure printing so that the solid content was 2 g / m ² to form a printing primer layer.

  On the primer layer for printing, a 4 μm wood grain pattern layer by gravure printing using an acrylic-urethane resin (resin in which 5 parts by weight of hexamethylene diisocyanate is added to 100 parts by weight of acrylic polyol) as printing ink. Formed.

A urethane-cellulose resin solution was applied to the surface of the resin sheet opposite to the pattern layer by a gravure printing method so that the solid content was 2 g / m ² to form a back primer layer.

  The urethane-cellulose resin solution is prepared by adding urethane and nitrified cotton in a mixed solvent of methyl ethyl ketone and methyl isobutyl ketone, and further adding hexamethylene diisocyanate to 5 parts by weight with respect to 100 parts by weight of the mixture of urethane and nitrified cotton. It was prepared by adding a part.

On the pattern layer, a thermosetting urethane resin adhesive is applied so that the solid content is 8 g / m ² , and a polypropylene resin is heated and melt-extruded by a T-die extruder to obtain a transparent film having a thickness of 8 μm. An adhesive layer and a transparent resin layer having a thickness of 80 μm were formed.

An uncured electron beam curable resin layer was formed on the transparent resin layer by coating and drying a urethane acrylate electron beam curable resin by a roll coating method so that the solid content was 15 g / m ² . . Thereafter, in an environment with an oxygen concentration of 200 ppm, the uncured resin layer is irradiated with an electron beam under conditions of an acceleration voltage of 125 KeV and 5 Mrad to cure the resin, and an electron beam curable resin layer (transparent surface protective layer) having a thickness of 15 μm. Formed.

  A decorative sheet having a thickness of 160 μm was prepared by the above method.

(Middle layer)
A high-density polyethylene was extruded using a T-die extruder to obtain a transparent high-density polyethylene sheet (intermediate layer) having a thickness of 400 μm.

  The transparent high-density polyethylene sheet was affixed on a 12 mm thick lauan plywood and had a surface hardness of 55 when measured using a type D durometer in accordance with JIS K 6253.

  Furthermore, both surfaces of the obtained intermediate layer were subjected to corona discharge treatment.

(Preparation of decorative materials for floors)
A thermosetting urethane resin adhesive was applied to the back primer surface of the decorative sheet so that the solid content was 8 g / m ^2, and the intermediate layer was laminated thereon. On the intermediate layer (on the opposite side of the decorative sheet), a urethane-cellulose resin solution was applied by gravure printing so that the solid content was 2 g / m ² to form a back primer layer.

And the back surface primer layer of the said intermediate | middle layer was stuck on lauan plywood with a thickness of 12 mm, and the flooring decorative material was produced. For the sticking, urethane-modified ethylene / vinyl acetate emulsion adhesive (9 g / scale ² wet) was used.

  According to the provisions of JIS K 6253, the surface hardness of the floor decorative material was 52 when measured from the decorative sheet side using a type D durometer.

Example 2
A flooring decorative material was produced in the same manner as in Example 1 except that a colored polypropylene film having a thickness of 60 μm was used instead of the resin sheet.

  Then, the surface strength of the floor decorative material was measured according to the same method as in Example 1. The surface decorative material obtained had a surface hardness of 59.

Comparative Example 1
Instead of the intermediate layer, a polycarbonate sheet with a thickness of 400 μm having a surface hardness of 78 when measured using a type D durometer according to the provisions of JIS K 6253 is prepared, and the sheet is used to make a decorative sheet for flooring. A flooring decorative material was produced in the same manner as in Example 1 except that was produced.

  Then, the surface strength of the floor decorative material was measured according to the same method as in Example 1. The surface decorative material obtained had a surface hardness of 75.

Test Example 1 (Caster resistance)
The caster resistance of the floor decorative materials obtained in Examples 1 and 2 was evaluated using a caster resistance test apparatus L6-O4 (manufactured by Asano Machinery Co., Ltd.). The evaluation procedure is as follows. That is, the floor decorative material to be tested was fixed on the sample fixing base. After the caster fixing base was raised by the adjustment handle so that the three casters did not contact the surface of the flooring decorative material, a weight was placed on the load base so that the weight would be 70 kg. Next, the load placed on the three casters was applied using the adjustment handle. The rotational speed was 20 rpm, counter-rotated every 5 minutes, set to 1000 rotations, and after completion of 1000 rotations, the adjustment handle was turned to float the caster fixing base, and the floor decorative material to be tested was taken out.

  The recessed depth of the taken-out floor decorative material was less than 100 μm. Therefore, the floor decorative material obtained in Examples 1 and 2 can be used effectively in places where caster resistance is required.

Test Example 2 (Scratch resistance)
Using a Hoffman scratch tester (BYK-GARDNER), the surface of the floor decorative material obtained in Examples 1 and 2 and Comparative Example 1 was scratched with a load of 1000 g. “O” was evaluated as “almost no change in surface”, “Δ” was evaluated as “slight whitening scratches were observed on the surface”, and “X” was evaluated as “whitening scratches were conspicuous on the surface”.

  The evaluation results are shown in Table 1. When Examples 1 and 2 were compared, whitening flaws occurred in Example 2 with a lower load.

Test example 3 (impact resistance)
According to the JIS K5600 DuPont impact test, a shooting mold having a hemispherical tip with a radius of 6.3 mm was allowed to stand on the floor decorative material surfaces obtained in Examples 1 and 2 and Comparative Example 1, and the shooting was performed. The weight was evaluated by dropping a weight of 500 g on the mold from a height of 30 cm. “○” was evaluated as “almost no change on the surface”, and “x” was evaluated as “cracking on the surface”. The evaluation results are shown in Table 1.

  The evaluation results are shown in Table 1.

Test example 4 (feeling of walking)
The flooring decorative material obtained in Example 1 was placed on the floor so that the decorative sheet side faced upward. The ease of walking (the burden on the foot, etc.) when walking on it was evaluated. “○” was evaluated as “relatively difficult to get tired” and “×” was evaluated as “relatively easy to get tired”. The same evaluation was performed on the floor decorative materials obtained in Example 2 and Comparative Example 1.

  The evaluation results are shown in Table 1.

Test Example 5 (Machinability)
The floor cosmetics obtained in Examples 1 and 2 and Comparative Example 1 were grooved to a depth reaching the lauan plywood from the decorative sheet side. The processed surface was observed, and “◯” was evaluated as “intermediate layer fuzz was hardly recognized” and “x” was evaluated as “intermediate layer fuzz was remarkably recognized”.

  The evaluation results are shown in Table 1.

Claims (6)

It is a decorative material for floor made by laminating a decorative sheet on a wooden substrate,
In accordance with JIS K 6253, a floor decorative material having a surface hardness of less than 60 when measured from the decorative sheet side using a type D durometer. 2. The intermediate layer according to claim 1, further comprising an intermediate layer having a surface hardness of less than 60 when measured using a type D durometer according to JIS K 6253, according to the provisions of JIS K 6253. Flooring cosmetics. The floor decorative material according to claim 2, wherein the intermediate layer is a polyethylene resin layer. The decorative sheet according to any one of claims 1 to 3, wherein the decorative sheet is a laminate formed by sequentially laminating a pattern pattern layer, a transparent adhesive layer, a transparent resin layer, and a transparent surface protective layer on a resin sheet. The floor decorative material as described. The flooring decorative material according to claim 4, wherein the intermediate layer is a polyethylene resin layer and the resin sheet is a polyethylene sheet. The flooring decorative material according to claim 4 or 5, wherein the transparent surface protective layer is an ionizing radiation curable resin layer obtained by curing and curing an ionizing radiation curable resin.