JP6932927B2 - Decorative sheet and decorative board - Google Patents

Description

The present invention relates to a decorative sheet and a decorative board used on the surface of a building interior, exterior, furniture, fittings, vehicle interior, etc. to give a texture of unevenness to the surface.

Conventionally, decorative sheets have been used as low-cost and highly processable building materials for various purposes such as the interiors and exteriors of buildings, furniture, fittings, and vehicle interiors as described above.

As an example of imparting functionality according to the application, for example, a decorative sheet imparted with heat-shielding property as seen in Patent Document 1 has been proposed.

On the other hand, as a decorative sheet that resembles a real material such as a wood grain board or tile, a decorative sheet having an uneven shape has been proposed.

Examples of the decorative sheet having an uneven feel include those provided with recesses by embossing as seen in Patent Document 2 and those provided with convex portions by raised printing as seen in Patent Document 3. , Those with physical irregularities have been proposed.

However, these decorative sheets are made to resemble real materials from the appearance impression, and when actually touched, although unevenness is provided, the feel is different from the real materials. It was easy to distinguish it as an artificial decorative sheet.

Japanese Unexamined Patent Publication No. 2013-083541 Japanese Patent No. 4690071 Japanese Unexamined Patent Publication No. 2008-08715

The present invention focuses on the above points, and is an object of providing a decorative sheet having irregularities on the surface imitating a real material and having the same feel as the real one. Is.

The first invention for solving the above problems is a decorative sheet having at least a pattern printing layer and a gloss adjusting layer and having an uneven structure at least in a part thereof, and the surface of the decorative sheet is covered with the above. It has a convex portion made of an ionizing radiation curable resin synchronized with pattern printing, a convex portion having a height of 30 μm to 100 μm is formed, and the surface is an automated surface tester (KES-SE). ), The MIU (coefficient of friction) is 0.11 to 0.15, and the MMD (variation of the coefficient of friction) is 0.010 to 0.035.

Next, the second invention, the on the back side of the support of the decorative sheet is provided with a primer layer, said primer layer has a particle size 1 to 4 [mu] m, pore volume from 0.4 to 2. The decorative sheet according to claim 1, wherein silica consisting of 0 ml / g is added.

Next, the third invention, the a decorative sheet, the decorative sheet is a decorative laminate, characterized by comprising a support which is bonded to at least one surface.

By using the decorative sheet of the present invention, it is possible to obtain a decorative sheet and a decorative board having a texture very close to that of a natural wood material.

It is sectional drawing which shows the structural example of the decorative board which concerns on embodiment of this invention. It is sectional drawing which shows the example of the decorative sheet which has a convex part which concerns on embodiment of this invention. It is sectional drawing which shows the example of the embossed decorative sheet which concerns on embodiment of this invention.

Next, an embodiment of the present invention will be described with reference to the drawings.

Here, the drawings are schematic, and the relationship between the thickness and the plane dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Further, the embodiments shown below exemplify a configuration for embodying the technical idea of the present invention, and the technical idea of the present invention describes the material, shape, structure, etc. of the constituent parts as follows. It is not specific to the thing. The technical idea of the present invention may be modified in various ways within the technical scope specified by the claims stated in the claims.

FIG. 1 is a cross-sectional view showing a configuration example of a decorative board according to an embodiment of the present invention.

The decorative board 1 has a structure in which a decorative sheet 14 composed of a base sheet 11, a pattern printing layer 12, and a gloss adjusting layer 13 is bonded to one side of a support 15, and the surface of the decorative sheet 14 has irregularities. The structure is formed.

The surface of the decorative sheet 14 of the present invention has a MIU (coefficient of friction) of 0.11 to 0.15 and an MMD (variation of coefficient of friction) of 0.010 to 0.15 by an automated surface tester (KES-SE). It is important that it is 0.035.

The automated surface tester (KES-SE) is intended to measure the texture of an object based on KES (KAWABATA EVALUATION SYSTEM), and is composed of a friction force detector, a friction element holder, and a friction element. By designing to imitate a fingertip, it is possible to quantify the feeling close to that of a human fingertip.

The slipperiness and roughness are evaluated by using the frictional force F required when the sample table on which the decorative sheet is installed moves at a constant speed while the friction element is in contact with the decorative sheet as a sample. be able to.

The ratio of the frictional force F to the vertical load N applied to the contact surface between the decorative sheet and the friction element is defined as the friction coefficient μ, and the average value (MIU value) of the friction coefficient can be considered to be slippery. It can be considered that when the value is large, the impression of "moistness" is given to the person, and when the value is small, the impression of "smoothness" is given to the person.

Further, by calculating the fluctuation of the average friction coefficient (MMD value) from the deviation of the average value of the friction coefficient, it is possible to obtain a feeling of roughness.
And when the numerical value is small, it can be considered that each impression such as "smoothness" is given to the person.

In general, in actual wood, the size of unevenness, inclination, repeating pattern, etc. are complicated combinations, and it can be said that almost no wood is the same.

However, depending on the type of wood, it can be said that the texture is within a substantially constant range.

The decorative sheet of the present invention is intended to mainly provide a decorative sheet imitating a natural oak material, and by setting the MIU value and the MMD value in the above range, a real wood texture can be obtained. It is possible to provide a decorative sheet that can be given to.

Next, a configuration example of the decorative sheet of the present invention will be described in more detail with reference to the drawings.

(Cosmetic sheet with convex parts made of ionizing radiation curable resin)
FIG. 2 is a cross-sectional view showing a configuration example of a decorative sheet having a convex portion made of an ionizing radiation curable resin, that is, a convex portion 25.

In the configuration example shown in FIG. 2, a pattern printing layer 23, a gloss adjusting layer 24, and a convex portion 25 made of an ionizing radiation curable resin are provided on the colored base sheet 21, and the surface opposite to the colored base sheet 21. Is provided with a primer layer 22.

Further, a transparent stain-resistant resin layer may be appropriately provided on the surface of the gloss adjusting layer 24 of the decorative sheet 2 having a convex portion.

As the colored base sheet 21 for the decorative sheet 2 having a convex portion, a conventionally known one can be used as long as it has processing suitability as a decorative sheet, but a vinyl chloride resin is not used. It is preferable to use a polyester-based resin sheet, a polyolefin-based resin sheet, or the like.

The colored base sheet 21 does not necessarily have to be colored with the base sheet itself, but if necessary, it includes a conventionally known colored dye, a filler, a foaming agent, a flame retardant, a lubricant, and an antioxidant. , UV absorbers, light stabilizers and other additives can be added according to conventional methods.

The thickness of the colored base sheet 21 varies depending on the application and the like, but it can be said that it is preferably about 50 μm to 100 μm.

The pattern printing layer 23 for the decorative sheet 2 having a convex portion is provided to impart designability by the pattern to the decorative sheet.

The pattern printing layer 23 uses a printing ink or paint obtained by dissolving or dispersing a colored dye such as a dye or a pigment in a suitable diluting solvent together with a suitable binder resin, for example, by a gravure printing method or an offset printing method. It can be formed by various known printing methods such as gravure coating method, roll coating method, gravure reverse coating method, die coating method and the like.

Examples of the binder resin include various resins such as urethane-based resin, acrylic-based resin, vinyl chloride-vinyl acetate copolymer, polyimide-based resin, and nitrocellulose, or mixtures thereof, but are limited thereto. It's not something.

The type of the printed pattern is not particularly limited, and a desired pattern can be arbitrarily provided, and there is no problem even if it is a solid color.

Further, in some cases, in order to improve the concealing property of the decorative sheet 2 having the convex portion, the back surface side of the pattern printing layer 23 is concealed with an opaque printing ink or paint containing a large amount of opaque pigments such as titanium oxide and iron oxide. Layers may be provided.

The gloss adjusting layer 24 is for adjusting the gloss of the surface and imparting durability, and a gloss adjusting agent (also referred to as a matting agent or a matting agent) is applied to the binder resin according to a desired gloss. It is formed by applying a composition with or without addition. If it is desired to make the surface particularly glossy, a gloss adjusting agent can be added.

As the binder resin, any resin that meets the requirements such as versatility of adhesion to various resins, deformation followability when post-processing the decorative sheet, and scratch resistance can be used. Two-component curable urethane resin, ionizing radiation curable resin, or a composite thereof is preferably used.

Examples of the gloss adjuster include inorganic substances such as silica, alumina (α-alumina, etc.), calcium carbonate, barium sulfate, kaolinite, and alumina silicate, or polycarbonate, nylon, urethane resin, acrylic resin, styrene resin, and silicone resin. Examples of fine particles of organic substances in the above.

The average particle size of the gloss adjuster is preferably about 1 to 10 μm, and the amount added is appropriately selected according to the desired gloss, but is usually about 30% by mass at the maximum.

When a two-component curable urethane resin is used as the binder resin, a urethane resin containing a polyol as a main component and an isocyanate as a cross-linking agent (curing agent) is preferable.

As the polyol, those having two or more hydroxyl groups in the molecule, for example, polyethylene glycol, polypropylene glycol, acrylic polyol, polyester polyol, polyether polyol, polycarbonate polyol, polyurethane polyol and the like are used.

Further, as the isocyanate, a multivalent isocyanate having two or more isocyanate groups in the molecule is used.

Examples of the polyvalent isocyanate include aromatic isocyanates such as 2,4-tolylene diisocyanate, xylene diisocyanate, and 4,4'-diphenylmethane diisocyanate, or 1,6-hexamethylene diisocyanate, isophorone diisocyanate, and hydrogenated triresin isocyanate. , An aliphatic (or alicyclic) isocyanate such as hydrogenated diphenylmethane diisocyanate is used.

Further, such adducts or multimers of various isocyanates can be used. Examples of the adduct or multimer include an adduct of triresin isocyanate and a trimer of triresin isocyanate.

Among the above-mentioned isocyanates, the aliphatic (or alicyclic) isocyanate is preferable because it can improve weather resistance and heat-resistant yellowing. Specifically, for example, 1,6-hexamethylene diisocyanate can be used.

Further, when an ionizing radiation curable resin is used as the binder resin of the gloss adjusting layer 24, a resin that can be cured by ultraviolet rays, electron beams, or the like can be exemplified. Specifically, polyester acrylate-based or epoxy acrylate-based resin. , Urethane acrylate type, acrylic acrylate type and the like can be appropriately selected and used, but the present invention is not necessarily limited to these.

The ionizing radiation curable resin that forms the convex portion 25 made of the ionizing radiation curable resin is a resin having an energy quantum capable of cross-linking and polymerizing molecules in an electromagnetic wave or a charged particle beam, that is, an ultraviolet ray, an electron beam, or the like. Refers to a resin composition that is crosslinked and cured by irradiation. Specifically, it can be appropriately selected from known polymerizable monomers, polymerizable oligomers and prepolymers commonly used as ionizing radiation or ultraviolet curable resins.

More specifically, as the polymerizable monomer, a (meth) acrylate-based monomer having a radically polymerizable unsaturated group in the molecule is preferable, and among them, a polyfunctional (meth) acrylate is preferable. Here, "(meth) acrylate" means "acrylate or methacrylate".

The polyfunctional (meth) acrylate may be any (meth) acrylate having two or more ethylenically unsaturated bonds in the molecule, and is not particularly limited.

Specifically, ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di ( Meta) acrylate, polyethylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate of hydroxypivalate, dicyclopentanyl di (meth) acrylate, caprolactone-modified dicyclopentenyl di (meth) acrylate, ethylene oxide-modified di-phosphate (Meta) acrylate, allylated cyclohexyl di (meth) acrylate, isocyanurate di (meth) acrylate, trimethyl propantri (meth) acrylate, ethylene oxide-modified trimethylol propanthry (meth) acrylate, dipentaerythritol tri (meth) acrylate , Propionic acid-modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate, propylene oxide-modified trimethylol propantri (meth) acrylate, tris (acryloxyethyl) isocyanurate, propionic acid-modified dipentaerythritol penta ( Examples thereof include meta) acrylate, dipentaerythritol hexa (meth) acrylate, ethylene oxide-modified dipentaerythritol hexa (meth) acrylate, and caprolactone-modified dipentaerythritol hexa (meth) acrylate. These polyfunctional (meth) acrylates may be used alone or in combination of two or more.

Further, together with the above-mentioned polyfunctional (meth) acrylate, a monofunctional (meth) acrylate can be appropriately used in combination for the purpose of lowering the viscosity thereof, as long as the object of the present embodiment is not impaired.

Examples of the monofunctional (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, and cyclohexyl (meth) acrylate. Examples thereof include meta) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, and isobornyl (meth) acrylate. One of these monofunctional (meth) acrylates may be used alone, or two or more thereof may be used in combination.

The polymerizable oligomer may be an oligomer having a radically polymerizable unsaturated group in the molecule. For example, epoxy (meth) acrylate-based, urethane (meth) acrylate-based, polyester (meth) acrylate-based, and polyether ( Meta) Acrylate type and the like can be mentioned.

Further, as the polymerizable oligomer, a highly hydrophobic polybutadiene (meth) acrylate-based oligomer having a (meth) acrylate group on the side chain of the polygutadiene oligomer, and a silicone (meth) acrylate-based oligomer having a polysiloxane bond on the main chain. , Aminoplast resin (meth) acrylate-based oligomer modified from aminoplast resin having many reactive groups in small molecules, or in molecules such as novolak type epoxy resin, bisphenol type epoxy resin, aliphatic vinyl ether, aromatic vinyl ether, etc. There are oligomers and the like having cationically polymerizable functional groups.

Further, granular particles, a reactive silicone resin, and the like can be added to the ionizing radiation curable resin.

As the particles, organic particles such as resin and inorganic particles such as glass and silica can be used.

Examples of the reactive silicone resin include materials having a silicone skeleton in the main chain, silicone oil used as a release agent, and the like, and in particular, ultraviolet rays having a silicone skeleton in the side chain from the viewpoint of stain resistance. A curable acrylate resin is suitable.

Further, various additives can be blended in the convex portion 25 according to desired physical properties. Examples of the additive include a weather resistance improver, an abrasion resistance improver, a polymerization inhibitor, a cross-linking agent, an infrared absorber, an antistatic agent, an adhesion improver, a leveling agent, a thixo property-imparting agent, and a coupling agent. , Plasticizers, defoamers, fillers, solvents, colored pigments and the like are used.

The top view shape of the convex portion 25 is not particularly limited, and may be a standard shape in which circles, quadrangles, hexagons, etc. are regularly arranged, or an irregular pattern, but the convex portion 25 Is synchronized with the pattern printing layer 23, so that a realistic feeling of the pattern can be obtained.

The height of the convex portion 25 made of the ionizing radiation curable resin as described above is preferably about 30 μm to 100 μm.

When the stain-resistant layer is provided on the surface of the gloss adjusting layer 24, the material used is not particularly limited, but a blocked isocyanate-curable urethane resin is preferably used.

A primer layer 22 is provided on the back surface side of the decorative sheet 2 having a convex portion.

As the primer layer 22, for example, a polyester resin, a polyurethane resin, a mixture thereof, or the like can be used.

Further, by using a two-component type of polyol and isocyanate, the adhesion between the sheet and the primer and the cohesive force of the primer itself can be improved. Examples of the polyol include acrylic polyol and polyester polyol.

Examples of the isocyanate include aromatic systems such as tolylene diisocyanate and 4,4'diphenylmethane diisocyanate, and aliphatic systems such as hexamethylene diisocyanate, isophorone diisocyanate, and xylene diisocyanate. Aromatic compounds are preferable in terms of quick reactivity and heat resistance.

The thickness of the primer layer 22 is preferably 1 μm or more. If it is less than 1 μm, it will be dissolved depending on the solvent type of the adhesive when adhering to the support for the decorative board, and the primer layer will disappear, so that the adhesiveness will not be improved.

Further, it is desirable that fillers such as silica are added to the primer layer, and if the silica has a particle size of 1 to 4 μm and a pore volume of 0.4 to 2.0 ml / g, it is an adhesive. It absorbs well and does not affect the cohesive force of the primer.

(Embossed cosmetic sheet)
As shown in FIG. 3, the embossed decorative sheet 3 according to the present embodiment is formed by laminating a pattern printing layer 33 and a transparent thermoplastic resin layer 34 on a colored base sheet 31 for the embossed decorative sheet 3 in this order. Has been done. Further, at least the transparent thermoplastic resin layer 34 is formed with embossed recesses in order to adjust the gloss of the surface and impart a three-dimensional effect. Further, the gloss adjusting layer 35 is laminated.

The embossing process for forming the embossed recesses may be performed directly on the transparent thermoplastic resin layer 34, or may be performed after the gloss adjusting layer 35 is laminated.

Further, at least the back surface side of the colored base sheet 31 is subjected to a surface activation treatment, and a primer layer 32 is provided on the surface activated surface. The thickness of the decorative sheet 3 having the embossed recesses is preferably 50 μm or more and 200 μm or less in consideration of weather resistance and suppression of whitening due to bending.

The colored base sheet 31 for the embossed decorative sheet 3 is a base sheet containing a thermoplastic resin. As the thermoplastic resin, various resins can be used. However, as the resin other than the vinyl chloride resin, for example, a polyolefin resin such as polypropylene or polyethylene, an acrylic resin, a polyester resin, an ethylene vinyl acetate resin, a polyimide resin or the like can be used. In particular, a polyolefin resin is preferable in consideration of pollution-free property, price, performance, ease of coloring, and the like. More specifically, crystalline polyolefins and polyolefin-based thermoplastic elastomers are preferable.

Further, according to the polyolefin-based thermoplastic elastomer, rubber such as hydrogenated butadiene is contained as a soft segment in the olefin-based resin called a hard segment, so that the flexibility that the conventional polyolefin-based resin does not have is obtained. Obtainable. Further, it is possible to obtain an excellent product with no pollution, low price, and easy coloring by adding a pigment.

In addition to olefin resins, thermoplastic elastomers include styrene resins, urethane resins, polyester resins, etc., but styrene resins are difficult to color due to their structure, and urethane resins have poor weather resistance. , Polyester-based resin is not suitable as a resin used as a colored base sheet 31 because of poor processability due to the hardness of the film.

Other than the above, for example, ethylene vinyl acetate copolymer, ethylene vinyl alcohol copolymer, polystyrene, ABS, polymethyl methacrylate, methyl polyacrylate, butyl polyacrylate, polyvinyl acetate, polyvinyl alcohol, polyvinyl butyral, polyvinyl Acetal, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyurethane, polyamide, nylon 6, nylon 66, polylactic acid, paper and the like may also be used, or these may be used in combination.

As described above, it is desirable that at least one side (back side) of the above-mentioned colored base sheet 31 is subjected to a surface activation treatment when a primer layer is provided.

Examples of the surface activation treatment include various treatment methods such as corona discharge treatment, frame treatment, ultraviolet treatment, high frequency treatment, glow discharge treatment, active plasma treatment, laser treatment, ozone acid treatment, and mechanical treatment. However, it is not particularly limited to these.

Further, the colored base sheet 31 does not necessarily have to color the base sheet itself, and a colored layer may be provided. However, when the base sheet itself is colored, a pigment is used as a coloring method. A dry color method using a fine powder colorant treated with a dispersion aid or a surfactant, a masterbatch pellet in which a resin and a high-concentration pigment are melt-mixed and pre-dispersed is prepared, and inside an extrusion hopper. It is possible to use a masterbatch method or the like in which a dry blend is performed with an ordinary resin which is not colored in the above, and the present invention is not particularly limited.

The type of pigment is also not particularly limited, but in consideration of weather resistance, heat resistance and the like, inorganic pigments such as titanium oxide, ultramarine blue, cadmium pigment and iron oxide are desirable. Further, as organic pigments, phthalocyanine pigments, quinacridone pigments and the like can be used. The color and blending ratio of the pigment are arbitrarily determined in consideration of the degree of concealment, designability, etc., and are not particularly limited.

Further, the thickness of the colored base sheet 31 for the embossed decorative sheet 3 is preferably 10 μm or more and 100 μm or less in consideration of general use.

The pattern printing layer 33 for the embossed decorative sheet 3 is a layer formed by printing on the colored base sheet 2 to add a pattern for imparting design.

As for the pattern of the pattern printing layer 33, the ink to be used, the printing method, and the like, all of them can be adopted in the same manner as the pattern printing layer 23 described in the decorative sheet 2 having the convex portion.

The transparent thermoplastic resin layer 34 does not necessarily have to be formed by a single layer, and may be a sheet-like layer composed of a plurality of layers. The transparent thermoplastic resin layer is formed of a transparent thermoplastic resin in which the pattern of the pattern printing layer 33 can be seen through.

As the thermoplastic resin, for example, various resins other than vinyl chloride resin can be used in consideration of the environment. When the transparent thermoplastic resin layer 34 is composed of a plurality of layers, various combinations of resins in each layer are possible depending on the desired characteristics. The number of layers may be four or more, but up to three layers is preferable because the structure of the extruder is complicated and the work is complicated.

Specific examples of the resin used for the transparent thermoplastic resin layer 34 include, for example, polyvinylidene fluoride, nylon 12, polyamide, polyvinyl alcohol, polystyrene, styrene / acrylonitrile copolymer, styrene / butadiene / acrylonitrile copolymer, and the like. High density polyethylene, medium density polyethylene, low density polyethylene, polypropylene, modified polypropylene, ethylene / vinyl acetate copolymer, polyacetal, polymethylmethacrylate, modified acrylic, polycarbonate, nitrocellulose, cellulose propionate, ethyl cellulose, cellulose acetate, polyurethane, etc. However, it is not limited to these.

As the resin constituting the transparent thermoplastic resin layer 34, polyethylene, polypropylene and the like can be particularly preferably used in consideration of the resin price, fluidity at the time of melting, various resistances and the like.

Further, either the ultraviolet absorber and the light stabilizer, or a composite thereof can be added to the transparent thermoplastic resin layer 34.

The ultraviolet absorber to be added to the transparent thermoplastic resin layer 34 can be appropriately selected from benzotriazole-based, triazine-based, benzophenone-based and the like.

Further, the light stabilizer to be added to the transparent thermoplastic resin layer 34 can be appropriately selected from an amine type, an amino ether type and the like.

Other than the above, for example, a heat stabilizer, a flame retardant, an antiblocking agent and the like may be added. Examples of the heat stabilizer include pentaerythrityl-tetrax [3- (3,5-di-t-butyl-4-hydroxyphenyl)]-propionate, 2,4-bis- (n-octylthio) -6- (4). -Hydroxy-3,5-di-t-butylanilino) -1,3,5-triazine, octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, 1,3,5- Trimethyl-2,4,6-tris (3,5-t-butyl-4-hydroxybenzyl) benzene, 1,3,5-tris (4-t-butyl-3-hydroxy-2,6-dimethylbenzyl) Hindered phenolic antioxidants such as isocyanuric acid, phenols such as 2,2'-methylenebis (4-ethyl-6-t-butylphenol) and 2,2'-methylenebis (4-methyl-6-t-butylphenol) Antioxidants, phosphorus antioxidants typified by tris (2,4-di-t-butylphenyl) phosphite, and mixtures thereof, that is, one type or a combination of two or more types are used. be able to.

Further, as the flame retardant, an inorganic compound such as aluminum hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, a phosphoric acid ester flame retardant, or the like can be used.

Further, as the blocking inhibitor, an inorganic blocking inhibitor such as aluminum silicate, silicon oxide, hydrotalcite or calcium carbonate, an organic blocking inhibitor such as fatty acid amide, or the like can be used. Further, it can be said that the thickness of the transparent thermoplastic resin layer 34 is preferably 10 μm or more and 100 μm or less.

Further, an adhesive layer or other functional layer may be provided between the pattern printing layer 33 and the transparent thermoplastic resin layer 34.

The adhesive layer is a layer containing an adhesive that adheres the pattern printing layer 33 and the transparent thermoplastic resin layer 34. The adhesive should be appropriately selected from various resins such as urethane-based, acrylic-based, and polyester-based, depending on the combination of the printing ink constituting the pattern printing layer 33 and the resin constituting the transparent thermoplastic resin layer 34. Can be done.

As the gloss adjusting layer 35 of the decorative sheet 3 having the embossed recesses, any resin composition that plays a role of protecting the surface and adjusting the gloss can be used, and among them, a thermosetting resin or ionizing radiation. It is desirable to consist of a curable resin or a composite thereof.

Specific examples of such resin compositions include polyurethane resins, acrylic silicone resins, fluorine resins, epoxy resins, vinyl resins, polyester resins, melamine resins, aminoalkyd resins, urea resins, and the like. Examples and examples thereof include monomers and oligomers having a vinyl group, but the present invention is not necessarily limited thereto.

The form of the resin composition is not particularly limited, such as aqueous, emulsion, and solvent-based.

Further, as for the curing method of the resin composition, a one-component type, a two-component type, an ultraviolet curing method, an electron beam curing method and the like can be appropriately selected and used.

Among them, the thermosetting type using isocyanate is preferable from the viewpoints of workability, price, cohesive force of the resin itself, and the like.

Examples of the isocyanate include toluene diisocyanate (TDI), xylylene diisocyanate (XDI), hexamethylene diisocyanate (HMDI), metadiisocyanate (MDI), lysine diisocyanate (LDI), irohodiisocyanate (IPDI), and methylhexane diisocyanate (HTDI). , Methylcyclohexamethylene diisocyanate (HXDI), trimethylhexamethylene diisocyanate (TMDI) and the like can be appropriately selected and used.

Alumina, silica, silicon nitride, silicon carbide, glass beads and the like can be appropriately added to the gloss adjusting layer 35 as a gloss adjusting agent, and these materials can also be expected to have an effect of imparting abrasion resistance. ..

Further, either an ultraviolet absorber and a light stabilizer, or a composite thereof can be added to the gloss adjusting layer 35, and the ultraviolet absorbers include the above-mentioned benzotriazole-based, triazine-based, and benzophenone. In addition to various organic UV absorbers such as those used, inorganic UV absorbers such as zinc oxide and vesicles of inorganic or organic UV absorbers may be used.

As the light stabilizer, it is preferable to use the amine type light stabilizer or the amino ether type light stabilizer shown above.

Further, in order to impart various functions to the gloss adjusting layer 35, functional additives such as an antibacterial agent and an antifungal agent can be arbitrarily added.
As described above, it is desirable that the primer layer 32 of the embossed decorative sheet 3 is provided on the back surface of the colored base sheet 31 after being subjected to a surface activation treatment.

As the primer layer 32, any material can be used as in the primer layer 22 of the decorative sheet 2 having the above-mentioned convex portion.

In the embossed decorative sheet 3 obtained as described above, as a means for forming the embossed recess 36, a pattern printing layer 33 is formed by printing on the colored base sheet 31, and then an adhesive layer is provided. There is a method in which a layer containing a transparent thermoplastic resin melted on the pattern printing layer 33 is extruded from a multi-layer extruder or the like, and at the same time, embossing and laminating are simultaneously performed by an embossing roll and a pressure roll.

Further, after laminating the colored base sheet 31 provided with the pattern printing layer 33 and the transparent thermoplastic resin layer, the gloss adjusting layer 35 is provided, and then the gloss adjusting layer is embossed by embossing roll. Is also good.

(Veneer)
The decorative board 1 can be obtained by attaching the decorative sheets 2 and 3 obtained as described above to the support 15 for the decorative board.

The support 15 includes those made of various materials such as a metal-based support and a wood-based support.

Examples of the metal-based support include a metal plate and an aluminum resin composite plate having a three-layer structure in which aluminum is provided on the surface of a resin which is a core material. As the metal plate, aluminum, galvalume steel plate (registered trademark), stainless steel, titanium and the like are used.

Further, as the resin material, polyethylene alone or a material obtained by adding an inorganic material to polyethylene is used.

Further, as the wood-based support, for example, medium density fiberboard (MDF), plywood, particle board and the like are used.

As a method of attaching the decorative sheet to the support 15 as described above, it is common to provide an adhesive layer between the support 15 and the decorative sheet and attach the decorative sheet.

As the adhesive, any known adhesive can be used, and for example, a reactive hot melt adhesive can be used. In particular, among the reactive hot-melt adhesives, it is preferable to use a two-component type polyurethane adhesive.

Further, an ultraviolet absorber, a light stabilizer, or the like may be added to the adhesive layer, and it can be said that an appropriate thickness of the adhesive layer is about 5 μm to 50 μm.

Next, examples and comparative examples of the present invention will be described, but the present invention is not necessarily limited to the examples.

(Examples 1 to 2, Comparative Examples 1 to 2)
A polybutylene terephthalate film having a thickness of 60 μm was used as the colored base sheet 21, and a wood grain pattern was gravure-printed as the pattern printing layer 23 with urethane resin ink.

After the pattern printing layer 23 is dried, a UV-curable resin to which a reactive silicone resin, an appropriate amount of an ultraviolet initiator, and a silica powder for adjusting the gloss to be low is added as a gloss adjusting layer 24 on the surface thereof is dried. The coating was applied so that the coating amount was 10 g / m ^2.

As the convex portion 25 made of the ionizing radiation curable resin, a printing plate synchronized with the pattern printing layer 23 is used so that the height of the convex portion is 30 μm with respect to 100 parts by weight of the ultraviolet curable resin. Using ink to which 30 parts by weight of urethane beads having a diameter of 5 μm and 20 parts by weight of silicone oil were added, convex portions were formed by uplift printing to obtain a decorative sheet having the convex portions of Example 1.

The second embodiment has the convex portion of the second embodiment in the same manner as the first embodiment, except that the “roughness” and the “smoothness” are different by changing the plate depth and the area of the convex portion 25. I got a decorative sheet.

Further, by adjusting the plate depth and the like of the printing plate for forming the convex portion, the decorative sheets having the convex portions of Comparative Example 1 and Comparative Example 2 were similarly produced.

The height of the convex portion of the decorative sheet having the convex portion of Comparative Example 1 was adjusted to 20 μm, and the height of the convex portion of the decorative sheet having the convex portion of Comparative Example 2 was adjusted to 30 μm. In addition, by changing the area of the convex portion, the "roughness" and "smoothness" were made different.

(Example 3, Comparative Example 3)
A polyolefin-based inorganic packed sheet 60 μm (manufactured by RIKEN TECHNOS CORPORATION) was used as the colored base sheet 31, and a wood grain pattern was printed on the colored base sheet 31 by a gravure printing method to form a pattern printing layer 33. Subsequently, a urethane resin-based adhesive was applied onto the pattern printing layer 33, and an adhesive layer was formed by warm air drying.

Subsequently, the molten polyethylene resin was extruded from the extruder with a T-die onto the adhesive layer to form the transparent thermoplastic resin layer 34.

At the same time, the embossing and laminating were performed at the same time by niping the laminated body of the colored base sheet 31, the pattern printing layer 33, the adhesive layer and the transparent thermoplastic resin layer 34 by the conduit embossing plate and the rubber roll. Here, the thickness of the transparent thermoplastic resin layer 34 was set to about 90 μm.

Next, after surface-treating the obtained embossed surface, a silica powder for gloss adjustment, a benzotriazole-based ultraviolet absorber, and a hindered amine-based layer 35 are prepared by adding a curing agent to a urethane-based resin. The material to which the light stabilizer was added was coated by a gravure coating method so that the coating amount after drying was 5 g / m ^2, and a gloss adjusting layer 35 was obtained.

Further, after surface activating treatment is applied to the back surface of the colored base sheet 31, a polyol resin to which silica and isocyanate are added on this surface is applied by a gravure coating method to a coating amount of 1 g / m after drying. The coating was performed so as to be No. ^{2, and a primer layer 32 was obtained.}

By the above procedure, the embossed decorative sheet 3 of Example 3 was obtained. Here, the depth of the embossed portion 36 was 80 μm.

Further, by adjusting the conduit embossed plate, the embossed decorative sheet of Comparative Example 3 was similarly produced.

The depth of the embossed portion in the embossed decorative sheet of Comparative Example 3 was 30 μm.

(Comparative Example 4 to Comparative Example 7)
As a sample to compare with the texture of actual natural wood, oak natural wood is prepared as comparative example 4, a finished product of oak natural wood is prepared as comparative example 5, and oak paint finish is prepared as comparative example 6. I prepared each one.

Further, as a comparison target using natural wood, in Comparative Example 7, a cherry-thick painted natural wood was prepared.

<Evaluation method>
The texture of each of the decorative sheets prepared in the above-mentioned Examples and Comparative Examples was measured using a friction tester KES-SE (manufactured by Kato Tech Co., Ltd.). A sensor (piano wire) that imitates the sensation of a fingertip was used for the friction element of KES-SE.

As a result, the fluctuation of the average friction coefficient (MMD value) is obtained from the average value of the friction coefficient (MIU value) and the deviation of the average value of the friction coefficient, and the feeling when the surface of the decorative sheet is actually touched by human hands is obtained. Was subjected to a sensory test.

(Evaluation results)
The evaluation results are shown in Table 1 below.

When a human touch evaluation was carried out using the oak natural woods of Comparative Examples 4 to 6 as a reference, the wood texture could be obtained in Examples 1, 2 and 3, but Comparative Example 1 and Comparative Example 1 and In Comparative Example 3, a feeling of unevenness could not be felt so much, and a wood texture could not be obtained.

In particular, in Comparative Example 1, MIU (average value of friction coefficient) is small and MMD (fluctuation of friction coefficient) is also small due to reasons such as insufficient height of the convex portion, so that it is "smooth" and "smooth". It became a feeling. In Comparative Example 3, MIU was good, but MMD was small and a wood texture could not be obtained.

Further, in Comparative Example 2, the height of the convex portion was sufficient and the feeling of unevenness could be sufficiently felt, but since the value of MMD was large, the feeling was "rough" and the texture of wood was obtained. There wasn't.

In addition, as a reference, in Comparative Example 7, the thick-painted natural wood was also evaluated, but the wood surface is painted, and the feeling of "moistness" is high due to the material of the painting. The overall feel was "smooth" and the wood texture was poor.

Further, in Comparative Example 6, although the coating was applied, the wood was different from that in Comparative Example 7, so that a rough feeling was obtained and a wood texture could be obtained.

As described above, by producing a decorative sheet in a region where the MIU value and the MMD value are appropriate values, it is possible to provide a decorative sheet that can feel the same texture as natural wood even when touched by human hands. Is possible.

1 ... Decorative board 11 ... Base sheet 12 ... Pattern printing layer 13 ... Gloss adjustment layer 14 ... Decorative sheet 15 ... Support 16 ... Concavo-convex structure 2 ... Decorative sheet with convex parts 21 ... Colored base sheet 22 ... Primer layer 23 … Pattern printing layer 24… Gloss adjusting layer 25… Convex part 3… Embossed decorative sheet 31… Colored base sheet 32… Primer layer 33… Pattern printing layer 34… Transparent thermoplastic resin layer 35… Gloss adjusting layer 36… Embossed part

Claims (3)

A decorative sheet having at least a pattern printing layer and a gloss adjusting layer, and at least partially having an uneven structure.
On the surface of the decorative sheet, a convex portion made of an ionizing radiation curable resin synchronized with the pattern printing is formed, and the convex portion having a height of 30 μm to 100 μm is formed, and the surface is Cosmetics characterized by a MIU (coefficient of friction) of 0.11 to 0.15 and an MMD (variation of coefficient of friction) of 0.010 to 0.035 by an automated surface tester (KES-SE). Sheet. A primer layer is provided on the back surface side of the support of the decorative sheet, and silica having a particle size of 1 to 4 μm and a pore volume of 0.4 to 2.0 ml / g is added to the primer layer. The decorative sheet according to claim 1, wherein the decorative sheet is characterized by the above. And decorative sheet according to claim 1 or claim 2, wherein the decorative sheet is characterized by comprising a support which is bonded to at least one surface, a reduction粧板.

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