JP4447628B2 - Wood veneer - Google Patents

Description

  The present invention relates to a wooden decorative board to which a decorative sheet having a grain pattern useful as a surface decoration material for building materials such as furniture and joinery is attached.

Conventionally, as a wooden decorative sheet, for example, a transparent colored polyvinyl chloride (PVC) film is provided with a decorative pattern printing layer, an embossing process on a grain pattern embossing, a wiping process, etc., if necessary. . Further, as a wood decorative board, a wooden decorative board or the like in which urethane coating is applied to a mug, a veneer or a laminated material is known (for example, see Patent Document 1).
Japanese Utility Model Publication No. 63-93132

  However, the above-described decorative sheet made of the conventional PVC film is inferior in weather resistance and is not suitable for exterior use. Moreover, since harmful chloride gas is generated at the time of disposal and combustion, there is a problem in terms of environmental sanitation. Moreover, since the said wooden decorative board is only what applies a urethane coating to a wooden material, there existed a problem that a weather resistance was inferior. In addition, the occurrence of defective products due to the adhesion of dust or the like on the wooden material has also been a problem.

  Accordingly, an object of the present invention is to provide a wooden decorative board to which a decorative sheet excellent in weather resistance and environmentally friendly is attached.

In order to solve the above-described problems, the present invention provides a wooden decorative board in which a decorative sheet is attached to a wooden board having a wood grain design via an adhesive layer, and the decorative sheet is transparent on a transparent base sheet. laminated acrylic resin sheet, the and the back surface on the sheet surface of the transparent substrate sheet can woodgrain pattern layer is provided in phantom, and, on the transparent substrate sheet has an average particle size of 0.1~10μm It is a sheet formed by adding 5 to 50 parts by weight of an inorganic filler made of fine particles with respect to 100 parts by weight of the resin component, and provided on the decorative sheet when viewed from the transparent acrylic resin sheet side of the decorative sheet It is to provide a wood decorative board in which the wood grain design of the wood board surface can be seen through the wood grain pattern layer, and any of the transparent base sheet and the transparent acrylic resin sheet of the decorative sheet Also to provide a wood veneer, characterized in that the UV absorber is contained.

Hereinafter, the present invention will be described in detail. The transparent base sheet material of the decorative sheet of the present invention contains high-density polyethylene, rubber and an inorganic filler, or isotactic polypropylene, rubber and an inorganic filler. The high density polyethylene is an ethylene polymer having a specific gravity of about 0.941 to 0.965. Isotactic polypropylene refers to a propylene polymer having an isotactic structure, high crystallinity, and a density of about 0.92 g / cm ³ and a secondary transition point of 160 to 170 ° C. For example, it can be obtained by polymerizing propylene in n-heptane using a Ziegler-Natta catalyst.

  Various rubbers are added to the base sheet material used in the decorative sheet of the present invention in order to impart flexibility, impact resistance, and easy adhesion to olefin resins such as high density polyethylene and isotactic polypropylene. Has been.

  Examples of rubbers to be added include diene rubbers, hydrogenated diene rubbers, and olefin elastomers. Among these, hydrogenated diene rubbers are preferable. The hydrogenated diene rubber is formed by adding a hydrogen atom to at least a part of a double bond of a diene rubber molecule. In the present invention, crystallization of an olefin resin such as high-density polyethylene and isotactic polypropylene is performed. It has the role of suppressing flexibility and improving flexibility and transparency. In general, when a diene rubber is added to the olefin resin, the weather resistance and heat resistance are lower than those of a polyolefin resin without the addition of a diene rubber because of the double bond of the diene rubber. Since the heavy bond is saturated with hydrogen, the weather resistance and heat resistance of the olefin-based resins such as high-density polyethylene and isotactic polypropylene are not deteriorated, which is favorable.

  Examples of the diene rubber include isoprene rubber, butadiene rubber, butyl rubber, propylene / butadiene rubber, acrylonitrile / butadiene rubber, acrylonitrile / isoprene rubber, and styrene / butadiene rubber. For the purposes of the present invention, styrene-butadiene rubber is particularly preferred.

  The amount of rubber added is preferably about 1 to 90 parts by weight, more preferably about 5 to 70 parts by weight with respect to 100 parts by weight of high density polyethylene or isotactic polypropylene. If it is less than 1 part by weight, the elasticity, elongation, and impact due to the addition of rubber are insufficient, and cracks and cracks are likely to occur during bending processes such as V-cutting and drawing. On the other hand, when the amount exceeds 90 parts by weight, the elasticity and the elongation rate become too large, and the registration of printing or the like is not preferable.

  Further, an inorganic filler is added to the base sheet material for the purpose of improving physical properties such as creep deformation resistance and easy adhesion. Examples of the inorganic filler include highly transparent particles such as calcium carbonate, calcium silicate, alumina, mica, quartz or silica, and glass having an average particle diameter of about 0.1 to 10 μm. The amount of the inorganic filler added is preferably about 5 to 50 parts by weight with respect to 100 parts by weight of high density polyethylene or isotactic polypropylene. If it is less than 5 parts by weight, the effects of creep deformation resistance, easy adhesion, etc. are insufficient, and if it exceeds 50 parts by weight, the tensile strength, impact resistance, and elongation are insufficient, and it is transparent. Sex is reduced.

  Furthermore, other flame retardants, antioxidants, ultraviolet absorbers and the like can be added to the transparent base sheet of the decorative sheet of the present invention as necessary. Flame retardants are added to impart plastics materials with flame resistance, such as chlorinated paraffin, tricresyl phosphate, chlorinated oil, tetrachlorophthalic anhydride, tetrabromophthalic anhydride, tetrabromobisphenol. A, dibromopropyl phosphate, tri (2,3-dibromopropyl) phosphate, antimony oxide, hydrous alumina, barium borate and the like. Antioxidants are added to suppress oxidative degradation of plastics and include, for example, alkylphenols, amines, quinones and the like. As the ultraviolet absorber, those described later are used.

  Further, a wood grain pattern (wood grain pattern) layer is provided on the surface of the base material sheet as desired. In order to provide a wood grain pattern layer, for example, a wood grain pattern is provided on the transparent base sheet colored by adding a pigment (or a dye) so as to have a wood grain base color as necessary, and is provided by a known printing method. There are methods.

  Examples of the pigment to be added include titanium white, zinc white, petal, vermilion, ultramarine blue, cobalt blue, titanium yellow, carbon black and other inorganic pigments, isoindolinone, Hansa Yellow A, quinacridone, permanent red 4R, phthalocyanine blue, Organic pigments (including dyes) such as Induslen Blue RS and Anin phosphorus black, metallic pigments such as aluminum and brass, titanium dioxide-coated mica, pearlescent pigments made of foil powder such as basic lead carbonate, etc. There is. In the case of coloring by adding a pigment, it needs to be transparent coloring. Therefore, an appropriate addition amount and material are selected from these.

  As a wood grain pattern printing method, a pattern can be formed with ink (or paint) using a known printing method such as gravure printing, offset printing, silk screen printing, transfer printing from a transfer sheet, or the like. In addition, a woodgrain pattern layer can be provided in the surface of a decorative sheet, a back surface, both front and back surfaces, or an interlayer. The wood grain pattern is selected so that the pattern of the wood grain board of a desired tree species such as cedar, camellia, cocoon, and pine is selected, and the back surface can be seen through. For this purpose, for example, printing is performed with highly transparent ink, or only a part of the grain (for example, only the winter wood part, only the conduit groove, etc.) is printed. The wood grain pattern only needs to have a pattern that can compensate for the shortage of the wood grain design itself.

  As the ink or paint, as the binder, chlorinated polyolefin such as chlorinated polyethylene and chlorinated polypropylene, polyester resin, urethane resin, acrylic resin, vinyl chloride / vinyl acetate copolymer, cellulose resin, etc. can be used. These 1 type or 2 or more types are mixed and used. To this, a pigment added with the above listed pigments is used.

  When printing a wood grain pattern directly on the surface of the substrate sheet, chlorinated polyolefin, urethane resin, etc. are preferable as a binder in terms of adhesiveness, but other layers can be formed by appropriately selecting an easy-adhesion primer. Even if a binder is used, sufficient adhesiveness can be provided.

  The thickness of the base sheet layer is about 25 to 100 μm, and either a stretched sheet or an unstretched sheet can be used, but the unstretched one is better in terms of molding suitability during V-cut processing. .

  As the transparent acrylic resin of the decorative sheet of the present invention, there is a polymer of methacrylic acid ester or acrylic acid ester (both are collectively referred to as (meth) acrylic acid ester). Polymerization is carried out by adding a peroxide catalyst such as benzoyl peroxide to a (meth) acrylic acid ester monomer or prepolymer and polymerizing at 80 to 90 ° C. Examples of the polymerization method include bulk polymerization, solution polymerization, emulsion polymerization, and granular polymerization. Examples of the (meth) acrylic acid ester include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, and butyl (meth) acrylate. An acrylic resin is obtained as a homopolymer or copolymer of one or more monomers (or prepolymers thereof) selected from these. The acrylic resin is excellent in weather resistance, transparency, and impact resistance.

  The acrylic resin sheet has a thickness of about 25 to 100 μm, and either a stretched sheet or an unstretched sheet can be used, but the unstretched sheet is better in terms of molding suitability during V-cut processing. .

  In the decorative sheet of the present invention, the base sheet and the transparent acrylic resin can be directly laminated. However, in order to improve interlayer adhesion, the base sheet and the transparent acrylic resin sheet layer are interposed. An adhesive layer can be provided.

  As a resin system and an adhesive method of the adhesive, preferably, a polyolefin resin, for example, polyethylene, polypropylene, or the like is used, and the adhesive layer is melt-extruded (extrusion coating method) between the base sheet and the transparent acrylic resin sheet. Or a thermosetting resin such as polyester resin, polyurethane resin or epoxy resin, if necessary, cross-linking agent such as isocyanate or amine, methyl ethyl ketone par A roll coater or the like between the base sheet and the transparent acrylic resin sheet with an adhesive added with a polymerization initiator such as oxide, hydroperoxide, azabisisobutyronitrile, or a polymerization accelerator such as cobalt naphthenate or dimethylaniline It is possible to employ a method in which the two layers are dry laminated. The thickness of the adhesive layer is usually about 10 to 30 μm.

  Among these, in order to improve heat resistance, an excess polyisocyanate is reacted with an adhesive of an isocyanate group type based on polyurethane, that is, an amorphous polyester polyol, and the terminal becomes an isocyanate group. Those having a prepolymer as a main component are preferred.

  The urethane-based resin adhesive is mainly composed of, for example, a urethane resin having a polyol as a main component and an isocyanate as a crosslinking agent (curing agent).

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

  For example, aromatic isocyanates such as 2,4-tolylene diisocyanate, xylene diisocyanate, 4,4-diphenylmethane diisocyanate, or aliphatics such as hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated diphenylmethane diisocyanate (or the like) Is an alicyclic) isocyanate. Alternatively, adducts or multimers of the above various isocyanates can also be used. Examples include adducts of tolylene diisocyanate and trimers of tolylene diisocyanate. If necessary, the adhesion surface can be subjected to known easy adhesion treatment such as corona discharge treatment, plasma treatment, degreasing treatment, and surface roughening treatment.

  In this invention, in order to improve the adhesiveness between a base material sheet and a grain pattern layer, a primer layer can be further provided on the said base material sheet. Since the primer layer is usually subjected to corona discharge treatment on the surface of the base sheet, the adhesion between the base sheet and the pattern ink is caused by reacting with a polar functional group such as a hydroxyl group or a carboxyl group present on the surface. It is provided in order to improve. The primer layer is preferably a two-component curable urethane resin. When a fatty acid (or aliphatic) isocyanate such as hexamethylene diisocyanate (HMDI) is used as the isocyanate and an acrylic polyol is used as the polyol, it can be particularly preferably used because of good light resistance.

  Moreover, in the decorative sheet of this invention, in order to improve the adhesiveness between a base material sheet and a pattern printing layer, a solid ink layer can be further provided on this primer layer. The solid ink layer is provided as a colored transparent layer on the entire surface in order to adjust the color of the base, and is preferably colored with a transparent ink.

  The transparent base sheet, the transparent acrylic resin layer or the adhesive layer of the decorative sheet of the present invention can contain an ultraviolet absorber for the purpose of improving the weather resistance. As the ultraviolet absorber, those that can absorb ultraviolet rays in the range of 280 to 450 nm that cause deterioration of polyolefin that is more easily deteriorated by ultraviolet rays can be arbitrarily selected from known ones.

  Examples of the ultraviolet absorber include benzophenone-based, salicylate-based, benzotriazole-based, and acrylonitrile-based ultraviolet absorbers. For example, an organic compound having an OH group in the molecule can be used, and 2- (2′-hydroxy-3 ′, 5′-di-tert-butylphenyl) -5-chlorobenzotriazole, 2- (2′-hydroxy-3′-tert-butyl-5′-methylphenyl) -5-chlorobenzotriazole, 2- (2′-hydroxy-3′-tert-amyl-5′-isobutylphenyl) -5 Chlorobenzotriazole, 2- (2′-hydroxy-3′-isobutyl-5′-methylphenyl) -5-chlorobenzotriazole, 2- (2′-hydroxy-3′-isobutyl-5′-propylphenyl)- 2'-hydroxyphenyl-5-chlorobenzotriazole-based UV absorbers such as 5-chlorobenzotriazole, 2- (2'-hydroxy-3) , 5'-di-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole and other 2'-hydroxyphenylbenzotriazole ultraviolet absorbers such as benzotriazole ultraviolet rays Absorber, 2,2′-dihydroxy-4-methoxybenzophenone, 2,2′-dihydroxy-4,4′-dimethoxybenzophenone, 2,2 ′, 4,4′-tetrahydroxy-4,4′-tetrahydroxy Benzophenone ultraviolet absorbers, 2-hydroxybenzophenone ultraviolet absorbers such as 2,4-dihydroxybenzophenone and the like, benzophenone ultraviolet absorbers such as phenyl salicylate, and salicylic acid ester ultraviolet rays such as 4-tert-butylphenyl salicylate An absorbent is used.

  In addition, a reactive ultraviolet absorber in which an acryloyl group or a methacryloyl group is introduced into the benzotriazole skeleton can also be used. Of these, benzotriazole ultraviolet absorbers are particularly preferred in consideration of the problem of absorption wavelength and colorability.

  Furthermore, the base sheet layer, acrylic resin layer, adhesive layer and the like of the decorative sheet of the present invention are provided with weather resistance, that is, for preventing discoloration due to sunlight, cracks, whitening, strength deterioration, etc. Various amine-based radical scavengers can also be added.

  Examples of radical scavengers include bis- (2,2,6,6-tetramethyl-4-piperidinyl) sebacate and other hindered amine radical scavengers such as compounds disclosed in Japanese Patent Publication No. 4-82625. Piperidyl radical scavengers and the like are used.

  The outermost surface of the decorative sheet of the present invention is preferably provided with an uneven pattern by embossing or the like. More preferably, the embossed concave portion is subjected to a wiping process in which ink is filled, and the surface thereof is coated with a two-component curable urethane resin (overcoat treatment).

  The embossing is performed to give a desired texture such as a wood board surface to the decorative sheet. For example, the embossing process heats and softens the acrylic resin on a heating drum, further heats it to 160 to 180 ° C. with an infrared radiation heater, and pressurizes and shapes with an embossed plate provided with an uneven pattern of a desired shape, It is formed by cooling and fixing, and a known single wafer or rotary embossing machine is used. As the concavo-convex pattern, a wood grain conduit groove, a float pattern (a concavo-convex pattern of a raised annual ring), a hairline, a grain, a satin texture, or the like is used.

  The wiping process is a process of filling ink while scratching the surface with a doctor blade in a recess provided by embossing. As the wiping ink, usually a two-component curable urethane resin can be used. The wiping process is performed to increase the commercial value by expressing a design that is closer to the actual grain by performing the wiping process especially on the grain conduit groove unevenness.

  Furthermore, the outermost surface of the decorative sheet of the present invention is preferably overcoated (OP processing). The OP processing is provided in order to cover the ease of scratches on the surface of the decorative sheet and to improve the scratch resistance. Examples of the resin used for OP processing include a two-component curable urethane resin. The two-component curable urethane resin is a urethane resin having a polyol as a main component and an isocyanate as a crosslinking agent (curing agent). As the polyol and isocyanate, all of those listed above can be preferably used.

  The decorative sheet of the present invention is used as a wooden decorative board by sticking to various wooden boards. Adhesion can usually be performed via a suitable adhesive layer. The wood boards used as adherends are wood such as veneer of various materials such as cedar, cocoon, firewood, pine, lawan, teak, melapie, wood veneer, wood plywood, particle board, medium density fiber board (MDF). There are materials.

  The wood decorative board produced as described above has various uses, for example, interior decoration materials for buildings such as walls, ceilings and floors, surface decorative boards for furniture such as window frames, doors and handrails, furniture or light electrical appliances, It can be preferably used for a surface decorative board of a cabinet such as an OA device.

  The decorative sheet of the present invention is obtained by laminating a transparent acrylic resin sheet on a transparent substrate sheet containing high-density polyethylene or isotactic polypropylene, rubber and an inorganic filler. Therefore, the decorative sheet of the present invention is excellent in transparency, moldability, impact resistance and weather resistance.

The wood decorative board of the present invention is a natural wood appearance design, particularly when a wood grain pattern is applied to the surface of at least one of the transparent base sheet or the transparent acrylic resin-based sheet and is stuck on the wooden board. Taking advantage of the surface luster grain inherent in the wood board, the grain pattern that is lacking in natural wood is supplemented with the grain pattern of the decorative sheet.

  The wood decorative board of the present invention is excellent in transparency, moldability, impact resistance and weather resistance, and is suitable not only for indoor use but also for exterior and semi-exterior coatings. A decorative sheet and a wooden decorative board.

  The wooden decorative board of the present invention is a wooden decorative board in which a decorative sheet is attached to a wooden board having a wood grain design via an adhesive layer, and the decorative sheet used for the wooden decorative board of the present invention is transparent. A transparent acrylic resin sheet is laminated on the base material sheet, and a wood grain pattern layer is provided on at least one surface of the transparent base material sheet or the transparent acrylic resin sheet so that the back surface can be seen through, and the transparent base sheet The material sheet is a sheet in which an inorganic filler composed of fine particles having an average particle diameter of 0.1 to 10 μm is added to 5 to 50 parts by weight with respect to 100 parts by weight of the resin, and has transparency, impact resistance and weather resistance. Excellent in properties. When this decorative sheet is made of a wooden decorative board adhered to a wooden board having a wood grain design via an adhesive layer, it is provided on the decorative sheet when viewed from the transparent acrylic resin sheet side of the decorative sheet. Further, it can be a wooden decorative board in which the wood grain design can be seen through the wood pattern layer, and both the transparent base sheet and the transparent acrylic resin sheet of the decorative sheet contain an ultraviolet absorber. It is possible to improve the weather resistance by using a wooden decorative board.

  The wooden decorative board of the present invention is a wooden decorative board that makes use of the surface gloss and the like inherent to the wooden board and supplements the wood pattern that is lacking in natural wood with the wood pattern of the decorative sheet. Further, since the surface of the decorative sheet is subjected to a wiping process and the outermost surface is coated with an overcoat layer, the decorative sheet is particularly excellent in design effect and excellent in scratch resistance.

  Furthermore, since the woody decorative board of the present invention is made of a non-vinyl chloride material, there is no generation of toxic chlorine gas at the time of disposal / incineration, and there is no problem in environmental hygiene.

  Next, the wood decorative board of the present invention will be described in more detail according to embodiments of the present invention. In addition, what is shown below is one embodiment of the decorative sheet of the present invention, and the decorative sheet of the present invention can be appropriately changed in design without departing from the gist of the present invention.

First Embodiment FIG. 1A shows a cross-sectional view of a decorative sheet according to a first embodiment of the present invention. The decorative sheet of this embodiment is provided with a wood grain pattern layer 2 by wood grain pattern printing on a transparent substrate sheet layer 1 containing high density polyethylene or isotactic polypropylene, rubber and an inorganic filler, and transparent The acrylic resin sheet layer 3 is laminated by lamination, and the embossing 4 is applied to the surface of the transparent acrylic resin sheet.

  The decorative sheet of this embodiment is obtained by laminating a transparent acrylic resin sheet on a transparent substrate sheet containing high-density polyethylene or isotactic polypropylene, rubber and an inorganic filler. Therefore, it is excellent in transparency, impact resistance and weather resistance. In addition, when a wood grain pattern is applied to the surface of at least one of the transparent base sheet or the transparent acrylic resin-based sheet and is stuck on a wooden board, the appearance design of natural wood, in particular, the surface unique to the wooden board It is a decorative sheet that makes use of luster and the like, and supplements the grain pattern that is lacking in natural wood with the decorative pattern of the decorative sheet.

Second Embodiment FIG. 1B is a sectional view of a decorative sheet according to a second embodiment of the present invention. The decorative sheet of this embodiment is provided with a wood grain pattern layer 2 on a transparent substrate sheet layer 1 containing high-density polyethylene or isotactic polypropylene to which a coloring pigment 5 is added, rubber and an inorganic filler, and on that. The transparent acrylic resin sheet layer 3 is laminated via the adhesive layer 7, embossing is performed on the surface of the transparent acrylic resin sheet, and wiping processing is performed to fill the embossed recess with the wiping ink 6. Are coated with an overcoat layer 8.

  The decorative sheet of this embodiment is obtained by laminating a transparent acrylic resin sheet on a transparent substrate sheet containing high-density polyethylene or isotactic polypropylene, rubber and an inorganic filler. It is a decorative sheet excellent in transparency, impact resistance and weather resistance. In addition, when a wood grain pattern is applied to the surface of at least one of the transparent base sheet or the transparent acrylic resin-based sheet and is stuck on a wooden board, the appearance design of natural wood, in particular, the surface unique to the wooden board It is a decorative sheet that makes use of luster and the like, and supplements the grain pattern that is lacking in natural wood with the decorative pattern of the decorative sheet.

  Furthermore, the decorative sheet of the present embodiment is a decorative sheet having excellent scratch resistance because the surface thereof is subjected to a wiping process and the outermost surface is coated with an overcoat layer. Further, since the design effect is particularly excellent, a desired wood grain decorative sheet can be obtained.

Third Embodiment FIG. 1 (c) shows a sectional view of a decorative sheet according to a third embodiment of the present invention. The decorative sheet of this embodiment is a primer layer for the purpose of improving interlayer adhesion on the transparent base sheet layer 1 containing high-density polyethylene or isotactic polypropylene to which a color pigment 5 is added, rubber and an inorganic filler. 9 is provided, and the grain pattern layer 2 is provided thereon. Then, the transparent acrylic resin sheet layer 3 is laminated, embossing is performed on the surface of the transparent acrylic resin sheet, wiping is performed to fill the embossed recess with the wiping ink 6, and an overcoat layer 8 is formed on the outermost surface. It is coated.

  The decorative sheet of this embodiment is obtained by laminating a transparent acrylic resin sheet on a transparent substrate sheet containing high-density polyethylene or isotactic polypropylene, rubber and an inorganic filler. It is a decorative sheet excellent in transparency, impact resistance and weather resistance. Moreover, since the primer layer 9 is provided between the base material sheet layer 1 and the wood grain pattern layer 2, it is particularly excellent in interlayer adhesion.

  Further, when a wood grain pattern is applied to the surface of at least one of the transparent base sheet or the transparent acrylic resin-based sheet and is stuck on a wooden board, the appearance design of natural wood, particularly the surface unique to the wooden board It is a decorative sheet that makes use of luster and the like, and supplements the grain pattern that is lacking in natural wood with the decorative pattern of the decorative sheet.

  Furthermore, the decorative sheet of the present embodiment is a decorative sheet having excellent scratch resistance because the surface thereof is subjected to a wiping process and the outermost surface is coated with an overcoat layer. Further, since the design effect is particularly excellent, a desired wood grain decorative sheet can be obtained.

Fourth Embodiment FIG. 2 shows a cross-sectional view of a wood decorative board of the present invention which is a fourth embodiment of the present invention. The wood decorative board of this embodiment is provided with a wood grain pattern layer 2 on a transparent base sheet layer 1 containing high-density polyethylene or isotactic polypropylene, rubber and an inorganic filler, and a transparent acrylic resin sheet thereon. Layer 3 is laminated, embossing is performed on the surface of the transparent acrylic resin sheet, wiping is performed to fill the embossed recess with wiping ink 6, and the decorative sheet 10 with the overcoat layer 8 coated on the outermost surface is provided. A wood board 11 is stuck through an adhesive layer 9.

  The wooden decorative board according to the present embodiment is a wooden decorative board that makes use of the surface gloss and the like inherent to the wooden board and supplements the wood pattern that is lacking in natural wood with the wood pattern of the decorative sheet. In addition, since the surface of the decorative sheet is subjected to a wiping process and the outermost surface is coated with an overcoat layer, the decorative sheet is excellent in scratch resistance. In addition, since the design effect is particularly excellent, a decorative board on which a desired wood pattern decorative sheet is attached can be obtained.

Next, the decorative sheet and the wooden decorative board of the present invention will be described in more detail and specifically by examples.
Example 1 (Manufacture of decorative sheet)
Resin containing 60 parts by weight of high density polyethylene, 30 parts by weight of hydrogenated styrene butadiene rubber, 10 parts by weight of calcium carbonate, 0.2 parts by weight of benzotriazole-based UV absorber and 0.2 parts by weight of hindered amine radical scavenger And a corona discharge treatment is performed on both the front and back surfaces of a 0.1 mm thick base sheet, and a primer layer is formed by applying a two-component curable urethane ink composed of polyester polyol and hexamethylene diisocyanate, A wood grain pattern consisting of a colored transparent solid layer with a thickness of 1 μm and a winter wood part of the annual rings of cedar boards, using an acrylic urethane resin as a binder and adding quinacridone, isoindolinone and carbon black as pigments. A layer was formed.

  Furthermore, after applying a thermoplastic urethane ink 10 μm thick on the wood grain pattern layer and providing a heat seal layer, it is made of polymethylmethacrylate and 0.2% by weight of benzotriazole UV absorber is added. The transparent acrylic film having a thickness of 50 μm was heat-sealed. At the same time, the surface was embossed and the wiping process was performed by filling only the embossed recess with wiping ink. Next, the outermost surface was subjected to gravure coating with a thickness of 2 μm with a two-component curable acrylic urethane-based resin composed of acrylic polyol and hexamethylene diisocyanate to obtain a decorative sheet of the present invention as shown in FIG.

Example 2 (Manufacture of a wooden decorative board)
On the back surface of the decorative sheet obtained in Example 1, by applying a two-component curable urethane resin ink composed of polyester polyol and hexamethylene diisocyanate, a primer layer 21 for adhering a wood board with a thickness of 2 μm is provided. The adhesive layer 22 is formed on the entire surface of the primer layer by applying an adhesive made of a two-component curable acrylic urethane resin at a rate of 40 g / m @ 2 to form a wood substrate 23 having a thickness of 5 mm. Adhering and curing for one week gave a wooden decorative board of the present invention as shown in FIG. The wood-made decorative board obtained in Example 2 is obtained by complementing the wood grain pattern lacking in natural eyes with the wood texture pattern of the decorative sheet in addition to the natural surface gloss of natural wood. Therefore, since the design effect is excellent, it is possible to obtain a decorative sheet in which the decorative sheet is adhered to the desired wood grain pattern.

Weather Resistance Test For the wood decorative board obtained in Example 2, a carbon arc saddle type sunshine weatherometer was used as an accelerated weather resistance tester, and the black panel temperature was 63 ° C. and the rain time was 1000 minutes under the conditions of 18 minutes in 120 minutes. When the surface change of the wooden decorative board after the time irradiation was confirmed by visual observation, almost no discoloration or discoloration was observed. Therefore, the wood decorative board of the present invention is excellent in weather resistance.

It is sectional drawing of the decorative sheet of this invention. (A) is sectional drawing of the decorative sheet of 1st Embodiment, (b) is sectional drawing of the decorative sheet of 2nd Embodiment, (c) shows sectional drawing of the decorative sheet of 3rd Embodiment, respectively. . It is sectional drawing of the woody decorative board of this invention. 1 is a cross-sectional view of a decorative sheet of the present invention manufactured in Example 1. FIG. 3 is a cross-sectional view of a wood decorative board of the present invention manufactured in Example 2. FIG.

Explanation of symbols

1,12 Transparent base sheet layer 2,16 Wood pattern layer 3,18 Transparent acrylic resin layer 4 Embossing 5,15 Color pigment 6,19 Wiping ink 7,22 Adhesive layer 8 Overcoat layer 9,13,21 Primer Layers 10, 20 Decorative sheet of the present invention 11, 23 Wood board 14 Colored solid layer 17 Heat seal layer

Claims (2)

A wooden decorative board in which a decorative sheet is bonded to a wooden board having a wood grain design via an adhesive layer, wherein the decorative sheet is formed by laminating a transparent acrylic resin sheet on a transparent base sheet, and the transparent base material is the back surface on the sheet surface of the sheet is woodgrain pattern layer is provided so as to be transparent, and the inorganic filler is a resin content of 100 weight comprised average particle size in the transparent substrate sheet from 0.1~10μm microparticles 5 to 50 parts by weight with respect to the part, and when viewed from the transparent acrylic resin sheet side of the decorative sheet, the wood grain surface design through the wood pattern layer provided on the decorative sheet A wooden decorative board characterized by the fact that it can be seen. 2. The woody decorative board according to claim 1, wherein an ultraviolet absorber is contained in both of the transparent base sheet and the transparent acrylic resin sheet of the decorative sheet.

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