Decorative sheet and method for producing the same

0001The present invention relates to a decorative board and a method for producing the same.

0002Conventionally, a decorative board having functionality such as antifouling property and antibacterial property has been provided by adding or applying a functional substance such as a photocatalyst to a decorative board such as a melamine decorative board.

0003Patent Document 1 discloses an antifouling decorative board having a silicone resin layer formed on its surface.

<p num="0004"><patcit num="1"><text>Japanese Unexamined Patent Publication No. 2003-276149</text></patcit></p>

<p num="0005">FIG. 3 is a schematic cross-sectional view schematically showing a conventional decorative board. In the decorative board 3, the functional substance 14 such as a photocatalyst is fixed to the surface resin layer 12 (silicone resin layer).</p><p num="0006">Since the decorative plate 3 shown in FIG. 3 is a water-repellent resin such as a silicone resin having a flat surface, it has excellent antifouling properties, but it is difficult for bacteria and viruses to adhere to the surface, and it functions with these bacteria and viruses. The contact probability and contact time with the sex substance were not sufficient, and the antibacterial and antiviral effects of the functional substance could not be sufficiently exhibited. In addition, when the surface of the decorative board is wiped and cleaned, the functional substance on the surface falls off, and there is a problem that the function is lost.</p><p num="0007">The present invention has been made in view of such a problem, and provides a decorative board which prevents deterioration of a surface resin layer made of a melamine resin or the like and is excellent in functional effect and maintenance thereof, and a method for producing the same. With the goal. In particular, it is an object of the present invention to provide a decorative board excellent in antibacterial and antiviral effects and its maintenance, and a method for producing the same.</p>

<p num="0008">The decorative board of the present invention comprises a base material, a surface resin layer laminated on one or both sides of the base material, a resin sheet composed of an oxidation-resistant resin arranged on the surface resin layer, and the resin. It is composed of a functional substance carried on the sheet, and is characterized in that a concave pattern is formed on the surface of the resin sheet on the side on which the functional substance is supported.</p><p num="0009">In the decorative board of the present invention, since a functional substance such as a photocatalyst is supported on an oxidation-resistant resin sheet, it is possible to exhibit the original functions as a functional substance such as antibacterial property and antiviral property. , The effect can be maintained for a long period of time. Further, when the functional substance is supported on the oxidation-resistant resin sheet, it is possible to prevent the functional substance from coming into contact with the surface resin layer. As a result, discoloration and deterioration of the surface resin layer due to the functional substance can be prevented.</p><p num="0010">Further, in the decorative board of the present invention, a concave pattern is formed on the surface of the resin sheet on the side on which the functional substance is supported. Therefore, even when the resin sheet is made of a water-repellent resin such as a silicone resin or a fluororesin, bacteria and viruses are trapped in the recessed groove, so that the resin sheet sufficiently reacts with a functional substance such as a photocatalyst. Opportunity and time are available to inactivate bacteria and viruses. In addition, when a concave pattern is formed on the surface, the surface area of the decorative board becomes large, so that the amount of functional substances supported such as a photocatalyst can be increased, and bacteria and viruses can be inactivated more efficiently. Can be done. Furthermore, since functional substances such as photocatalysts are also supported inside the recessed groove, the functional substances inside the groove are not removed and remain even if the surface of the decorative board is wiped and cleaned. Does not lose the inactivating function of bacteria and viruses.</p><p num="0011">The resin sheet made of the oxidation-resistant resin in the present invention may be a resin sheet formed into a film, or an impregnated paper in which the paper is impregnated with the oxidation-resistant resin. Further, a liquid oxidation-resistant resin may be applied to the surface resin layer in layers, dried and cured to form a sheet. That is, the resin sheet made of the oxidation-resistant resin in the present invention can be rephrased as the oxidation-resistant resin layer.</p><p num="0012">In the decorative board of the present invention, the depth of the concave pattern is preferably 10 to 50 μm. This is because if the concave pattern is too deep, functional substances such as photocatalysts are localized and the antiviral property is lowered. On the contrary, if the concave pattern is too shallow, viruses and the like cannot be trapped and the antiviral property is lowered. ..</p><p num="0013">The recessed pattern is preferably used for a delicate pattern such as a wood grain pattern. This is because the unevenness of the conduit portion can be realistically expressed, and the shaped decorative material can obtain the same texture as the material using actual wood.</p><p num="0014">In the decorative board of the present invention, the resin sheet made of an oxidation-resistant resin is preferably made of a silicone resin or a fluororesin. Silicone resins and fluororesins have the property of being less likely to be oxidized by functional substances such as photocatalysts. Therefore, by supporting the functional substance on the resin sheet made of silicone resin or fluororesin, it is possible to prevent the functional substance from coming into contact with the surface resin layer and also to prevent deterioration of the resin sheet.</p><p num="0015">In the decorative board of the present invention, the thickness of the resin sheet is preferably 10 to 1000 μm. By setting the thickness of the resin sheet within the above range, the functional substance can be adhered to the surface resin layer, and the characteristics of the functional substance can be fully exhibited.</p><p num="0016">In the decorative board of the present invention, it is desirable that the functional substance is a visible light responsive photocatalyst.</p><p num="0017">In the decorative plate of the present invention, the visible light responsive photocatalyst is a platinum-supported titania catalyst, a copper-supported titania catalyst, an iron-supported titania catalyst, a nitrogen-doped titania catalyst, a sulfur-doped titania catalyst, a carbon-doped titania catalyst, or tungsten oxide. It is desirable to have.</p><p num="0018">In the method for producing a decorative plate of the present invention, a resin-impregnated paper and a resin sheet made of an oxidation-resistant resin are arranged on one or both sides of a base material, and a molding plate having a convex shape on the surface is further formed. A step of placing the convex-shaped surface on the resin sheet side and thermosetting these to obtain a laminate composed of a resin sheet having a concave pattern on the surface, a surface resin layer, and a base material. It is characterized by including a step and a step of supporting a functional substance on the resin sheet on which the recessed pattern is formed. In the method for producing a decorative plate of the present invention, a concave pattern is efficiently formed by transferring a concave pattern to the surface of a resin sheet made of an oxidation-resistant resin by using a shaped plate having a convex shape on the surface. Can be formed.</p>

<p num="0019">In the decorative board of the present invention, since a functional substance such as a photocatalyst is supported on an oxidation-resistant resin sheet, it is possible to exhibit the original functions as a functional substance such as antibacterial property and antiviral property. , The effect can be maintained for a long period of time. Further, when the functional substance is supported on the oxidation-resistant resin sheet, it is possible to prevent the functional substance from coming into contact with the surface resin layer. As a result, discoloration and deterioration of the surface resin layer due to the functional substance can be prevented. Further, in the decorative board of the present invention, a concave pattern is formed on the surface of the resin sheet on the side on which the functional substance is supported. Therefore, even when the resin sheet is made of a water-repellent resin such as a silicone resin or a fluororesin, bacteria and viruses are trapped in the recessed groove, so that the resin sheet sufficiently reacts with a functional substance such as a photocatalyst. Opportunity and time are available to inactivate bacteria and viruses. In addition, when a concave pattern is formed on the surface, the surface area of the decorative board becomes large, so that the amount of functional substances supported such as a photocatalyst can be increased, and bacteria and viruses can be inactivated more efficiently. Can be done. Furthermore, since functional substances such as photocatalysts are also supported inside the recessed groove, the functional substances inside the groove are not removed and remain even if the surface of the decorative board is wiped and cleaned. Does not lose the inactivating function of bacteria and viruses.</p>

0020<figref num="1">FIG. 1 is a schematic cross-sectional view schematically showing a decorative board according to an embodiment of the present invention.</figref><figref num="2">2 (a), 2 (b) and 2 (c) are schematic cross-sectional views schematically showing a method for manufacturing a decorative board according to an embodiment of the present invention.</figref><figref num="3">FIG. 3 is a schematic cross-sectional view schematically showing a conventional decorative board.</figref>

0021Hereinafter, the decorative board of the present invention will be described in detail. FIG. 1 is a schematic cross-sectional view schematically showing a decorative board according to an embodiment of the present invention.

0022The decorative plate 1 of the present invention has a surface resin layer 12 made of a base material 120 and a melamine resin or the like laminated on the surface of the base material 120, and a resin sheet 13 made of an oxidation-resistant resin is placed on the surface resin layer 12. A recessed pattern 130 is formed on the surface of the resin sheet 13. Further, the functional substance 14 has a structure supported on the resin sheet 13.

0023In the decorative board of the present invention, bacteria and viruses are captured by the concave pattern formed on the surface of the resin sheet, the contact probability with a functional substance such as a photocatalyst is high, and the contact time is long. It has a high function of inactivating bacteria and viruses. Further, since the surface area of the decorative board is increased, the amount of a functional substance supported such as a photocatalyst can be increased.

0024In the decorative board of the present invention, the depth of the concave pattern is preferably 10 to 50 μm. This is because if the concave pattern is too deep, functional substances such as photocatalysts are localized and the antiviral property is lowered. On the contrary, if the concave pattern is too shallow, viruses and the like cannot be trapped and the antiviral property is lowered. ..

0025The base material used for the decorative board of the present invention is not particularly limited, and non-combustible base materials such as core paper and magnesia cement generally used for decorative boards can be used. The core paper may be used alone or as a laminated body in which a plurality of core papers are laminated. The number of core papers is not particularly limited, but may be 1 to 20 sheets. As the core paper, for example, aluminum hydroxide papermaking can be used. The core paper can be impregnated with phenol resin. Further, the core paper and the magnesia cement non-combustible base material can be laminated to form a base material.

0026The magnesia cement non-combustible base material can be used alone or can be laminated and arranged in the center of the core paper to form the base material. Magnesia cement non-combustible base material is magnesium oxide (MgO) and magnesium chloride (MgCl)₂) Are mixed, and aggregate and water are added and kneaded, and the mixture is formed into a plate shape. As the aggregate, inorganic fibers such as rock wool and glass wool, and organic fibers such as wood chips and pulp can be used. Further, in order to increase the strength of the magnesia cement non-combustible base material, a glass fiber layer formed in a mesh shape or the like can be provided as an intermediate layer.

0027The method for forming the surface resin layer on the surface of the base material made of a plurality or a single core paper and / or a magnesia cement non-combustible base material is not particularly limited, and can be carried out by a general method. For example, a method of laminating melamine resin-impregnated paper on one side or both sides of the base material and hot-press molding can be used. When the above method is used, the melamine resin of the melamine resin-impregnated paper permeates the core paper, and the curing reaction proceeds there to develop the adhesive force of the melamine resin-impregnated paper to the core paper. The resins that can be used for the surface resin layer constituting the decorative board of the present invention include melamine resin, diallyl phthalate (DAP) resin, polyester resin, olefin resin, vinyl chloride resin, acrylic resin, epoxy resin, and urethane resin. , Phenolic resin, silicone resin, guanamine resin and the like. Among these, it is desirable to use a melamine resin.

0028Melamine resin is a resin with improved dimensional stability and toughness without impairing optical and visual characteristics such as translucency. As the melamine resin, any known resin can be adopted as long as it is a resin using melamine and its derivative as a monomer. Further, the melamine resin may be a resin composed of a single monomer or a copolymer composed of a plurality of monomers. Examples of the melamine derivative include derivatives having a functional group such as an alkoxymethyl group such as an imino group, a methylol group, a methoxymethyl group and a butoxymethyl group. Further, a compound obtained by reacting a melamine derivative having a methylol group with a lower alcohol to partially or completely etherify it can be used as a monomer. Derivatives having a methylol group such as monomethylol melamine, dimethylol melamine, trimethylol melamine, tetramethylol melamine, pentamethylol melamine, hexamethylol melamine (hereinafter referred to as "methylolated melamine") are copolymerized with melamine as a cross-linking agent. A melamine resin can be used.

0029The melamine resin-impregnated paper is produced by impregnating a pattern paper with a melamine resin at a predetermined impregnation rate, and then heating and drying the paper. The pattern paper can be impregnated with the melamine resin by immersing the pattern paper in a melamine resin-containing solution using, for example, an aqueous formaldehyde solution as a solvent. Further, in order to impart bending workability to the melamine resin-impregnated paper, a solution containing a plasticizer can be impregnated together with the melamine resin. As the plasticizer, for example, ε-caprolactam, acetoguanamine, paratoluene sulfonic acid amide, urea and the like can be used. As the pattern paper, for example, titanium paper is used. The basis weight of the pattern paper is 80 to 150 g / m in consideration of the thickness and weight of the pattern paper.²Can be. The heating and drying temperatures can be set to 100 to 150 ° C to firmly adhere the melamine resin to the pattern paper.

0030In the decorative board of the present invention, the material of the resin sheet is not particularly limited as long as it is an oxidation-resistant resin, but it is desirable that it is a silicone resin or a fluororesin. Silicone resins and fluororesins have the property of being less likely to be oxidized by functional substances such as photocatalysts. Therefore, by supporting the functional substance on the resin sheet made of silicone resin or fluororesin, it is possible to prevent the functional substance from coming into contact with the surface resin layer and also to prevent deterioration of the resin sheet.

0031As the silicone resin, for example, a silicone resin, a modified silicone oil, or the like can be used. As the modified silicone oil, a silicone oil having one or more functional groups in the molecule can be used. The position where the functional group is introduced is not particularly limited, and the functional group may be introduced at any position of one end, both ends, or a side chain of the polysiloxane main chain. Further, as the functional group, for example, a hydroxyl group, an amino group, a methoxy group, a hydrazino group, an epoxy group, a methacryl group, a carboxyl group, a carbinol group and the like can be introduced.

0032Examples of the fluororesin include polytetrafluoroethylene (PTFE), perfluoroethylene propene copolymer (FEP), perfluoroalkoxyalkane (PFA), tetrafluoroethylene-perfluorodioxol copolymer (TFE / PDD), and ethylene. Examples thereof include tetrafluoroethylene polymer (ETFE), polyvinylidene fluoride (PVDF), polychlorotrifluoroethylene (PCTFE), and ethylene-chlorotrifluoroethylene copolymer (ECTFE). Further, as the fluororesin, fluororubbers such as polyvinyl fluoride type (PVF), vinylidene fluoride type (FKM), tetrafluoroethylene-propylene type (FEPM), and tetrafluoroethylene-perfluorovinyl ether type (FFKM) should be used. You can also.

0033In the decorative board of the present invention, the thickness of the resin sheet made of the oxidation-resistant resin is preferably 10 to 1000 μm, and more preferably 50 to 500 μm. By setting the thickness of the resin sheet made of the oxidation-resistant resin within the above range, the functional substance can be adhered to the surface resin layer, and the characteristics of the functional substance can be fully exhibited.

0034In the decorative board of the present invention, the shape of the resin sheet is not particularly limited, and may be punched into a required shape as appropriate.

0035In the decorative board of the present invention, it is desirable that the functional substance is a functional material having functions such as antibacterial property, antiviral property, antiallergenic property, and deodorant property. For example, examples of antibacterial and antiviral functional substances include visible light responsive photocatalysts. Specific examples of this visible light responsive photocatalyst include those in which titanium oxide is supported by a platinum group such as platinum, palladium, rhodium, ruthenium, iron, copper, or the like. In the decorative plate of the present invention, the visible light responsive photocatalyst is a platinum-supported titania catalyst, a copper-supported titania catalyst, an iron-supported titania catalyst, a nitrogen-doped titania catalyst, a sulfur-doped titania catalyst, a carbon-doped titania catalyst, or tungsten oxide. It is desirable, and more preferably a copper-supported titania catalyst. Examples of the copper-supported titania catalyst include CuO / TiO described in JP-A-2006-232729.₂Anatase-type titanium oxide containing copper in the range of (% by weight) = 1.0 to 3.5, cuprous oxide (copper (I) oxide: Cu) described in JP2012-210557₂A photocatalyst composition in which O) and titanium oxide are compounded, titanium oxide having a mixture containing a monovalent copper compound and a divalent copper compound described in JP-A-2013-166705 on its surface, and Titanium Oxide, which is published internationally. Examples thereof include copper and titanium-containing compositions containing titanium oxide containing crystalline rutile-type titanium oxide and a divalent copper compound described in 2013/094573.

0036In the decorative board of the present invention, it is desirable that the functional substance is present on the surface of the resin sheet made of the oxidation-resistant resin, and a part of the functional substance is embedded in the resin sheet made of the oxidation-resistant resin. You may be doing it. When a part of the functional substance is embedded in the resin sheet, the adhesion between the resin sheet and the functional substance can be ensured and the functional substance can be prevented from falling off.

0037The decorative board of the present invention may have a dried body of an inorganic sol or a cured body of an adhesive on the surface layer of the resin sheet. By immobilizing the functional substance via a dried body of the inorganic sol or a cured body of the adhesive, the functional substance can be more firmly immobilized. As the inorganic sol, silica sol, alumina sol, silica-alumina sol, titania sol and the like can be used, and it is desirable to use silica sol. As the adhesive, an adhesive made of silicone resin, fluororesin or the like can be used, and it is desirable to use an adhesive made of silicone resin.

0038Next, the method for producing the decorative board of the present invention will be described. In the method for producing a decorative plate of the present invention, a resin-impregnated paper and a resin sheet made of an oxidation-resistant resin are arranged on one or both sides of a base material, and a molding plate having a convex shape on the surface is further formed. A step of placing the convex-shaped surface on the resin sheet side and thermosetting these to obtain a laminate composed of a resin sheet having a concave pattern on the surface, a surface resin layer, and a base material. It is characterized by including a step and a step of supporting a functional substance on the resin sheet on which the recessed pattern is formed.

00392 (a), 2 (b) and 2 (c) are schematic cross-sectional views schematically showing a method for manufacturing a decorative board according to an embodiment of the present invention. As shown in FIG. 2A, the resin-impregnated paper 22 and the resin sheet 13 are placed on the base material 120, and then the mold plate 31 having a convex shape 32 on the surface is placed. By hot-press molding these, as shown in FIG. 2B, the resin-impregnated paper 22 is formed into the surface resin layer 12, and the concave pattern 130 is formed on the surface of the resin sheet 13. Then, as shown in FIG. 2C, the functional substance 14 is supported on the resin sheet 13 on which the concave pattern 130 is formed.

0040First, a surface resin layer is formed on the surface of a substrate made of a plurality or a single core paper and / or a magnesia cement non-combustible substrate or the like. The base material, the method for producing the same, and the surface resin layer have been described in the description of the decorative board of the present invention, and will be omitted here.

0041As described in the decorative board of the present invention, the method of forming the surface resin layer on the surface of the base material is not particularly limited, and can be performed by a general method. Specific methods for forming the surface resin layer include, for example, a laminating step of laminating a resin-impregnated paper such as melamine resin on one side or both sides of a base material made of a laminated body of core paper, and a resin-impregnated paper such as melamine resin. Examples thereof include a method including a hot pressure molding step of hot pressure molding the laminated base material. When the above method is used, the melamine resin of the melamine resin-impregnated paper permeates the core paper, and the curing reaction proceeds there to develop the adhesive force of the melamine resin-impregnated paper to the core paper.

0042The temperature of the veneer can be 125 to 150 ° C as the heating condition for hot pressure molding, and 1.96 to 9.80 MPa (20 to 100 kg / cm) as the pressurizing condition.²) Can be. When the temperature is less than 125 ° C or the pressure is less than 1.96 MPa, the adhesion of the resin-impregnated paper to the base material is insufficient, and peeling is likely to occur. On the other hand, if the temperature exceeds 150 ° C or the pressure exceeds 9.80 MPa, cracks may occur.

0043As described above, in the method for producing a decorative board of the present invention, a resin-impregnated paper and a resin sheet made of an oxidation-resistant resin are arranged on a base material, and a molding plate having a convex shape is placed on the surface thereof. After that, thermosetting is performed. As a result, the resin-impregnated paper can be used as the surface resin layer, and a concave pattern can be formed on the surface of the resin sheet.

0044As a method for producing the resin sheet, for example, when the resin sheet is made of a silicone resin, a sol solution containing the silicone resin or the like is applied onto the release film, dried, and then the release film is removed. Can be mentioned. When producing a resin sheet, it is desirable that the sol solution or the like is applied onto a release film and then dried in a pressed state. By drying in the pressed state, the flatness of the resin sheet can be further reduced. Further, the resin-impregnated paper may be impregnated with a silicone resin or a fluororesin.

0045It is desirable that the resin sheet made of the oxidation-resistant resin before being placed on the resin-impregnated paper is in a semi-cured state. The resin sheet can be completely cured by performing thermal pressure molding after arranging it on the resin-impregnated paper.

0046Examples of the method of arranging the resin sheet made of the oxidation-resistant resin on the resin-impregnated paper include a method of laminating the resin sheet on the resin-impregnated paper in the same manner as when laminating the resin-impregnated paper on the base material. ..

0047By immersing the base material on which the resin sheet is placed in a solution containing a functional substance, the functional substance can be supported on the surface of the resin sheet made of an oxidation-resistant resin. The functional substance may be supported on the surface of the resin sheet made of the oxidation-resistant resin by applying or spraying the solution containing the functional substance on the base material on which the resin sheet is arranged.

0048The above solution containing the functional substance may further contain an inorganic sol or an adhesive. This is because the immobilization of functional substances can be reinforced. As the inorganic sol, silica sol, alumina sol, silica-alumina sol, titania sol and the like can be used, and it is desirable to use silica sol. As the adhesive, an adhesive made of silicone resin, fluororesin or the like can be used, and it is desirable to use an adhesive made of silicone resin.

<p num="0049">(Example 1) (Primary melamine impregnation process) A roll paper having a thickness of 0.2 to 0.3 mm is immersed in a melamine resin solution. The roll paper is impregnated with the melamine resin by passing the roll paper while immersing it in the solution so that the temperature of the solution is 20 ° C. and the immersion time is 2 minutes. The moving speed of the roll paper is 10 to 20 cm / sec. (Drying process) The roll paper that has passed through the melamine resin solution is dried by a dryer at a temperature of 100 ° C. and a drying time of 30 seconds.</p><p num="0050">(Secondary melamine impregnation process) The roll paper that has undergone the drying step is immersed in the melamine resin solution. The roll paper is impregnated with the melamine resin by passing the roll paper while immersing it in the solution so that the temperature of the solution is 20 ° C. and the immersion time is 30 minutes. The moving speed of the roll paper is 10 to 20 cm / sec. (Drying / cutting process) The roll paper that has passed through the melamine resin solution is dried by a dryer at a temperature of 100 ° C. and a drying time of 2 hours. After drying, cut into 910 mm x 1820 mm.</p><p num="0051">(Resin sheet forming process) A silicone-coated film (silicone resin sheet) is obtained by applying an acrylic silicone resin emulsion (PCU-103 manufactured by Titan Kogyo, Ltd.) as a silicone-based binder to a polyethylene terephthalate film having a thickness of 50 μm to a thickness of 10 μm.</p><p num="0052">(Combination process) Four sheets of phenol resin-impregnated core paper having a thickness of 0.3 to 0.4 mm are laminated, and the melamine resin-impregnated paper and the silicone resin sheet obtained by the above step are laminated on the four sheets. Further, on the silicone resin sheet, a stainless steel mold plate having a large number of convex shapes is placed on the surface of the silicone resin sheet so that a conduit-like depression of wood can be formed on the surface of the silicone resin sheet. By press machine, temperature 170 ° C, pressure 50kg / cm², Heat and pressurize in 100 minutes. As a result, the silicone resin sheet is fixed on the melamine resin impregnated layer, and a concave pattern like a wood conduit is formed on the surface of the silicone resin sheet by transferring the convex shape of the shaping plate.</p><p num="0053">(Photocatalyst loading step) CuO-TiO with an average particle size of 100 nm₂A slurry in which the photocatalyst of No. 1 is dispersed in water and a silica sol (SiO)₂A methanol mixture solution (photocatalyst concentration 0.05% by weight) containing 4.5: 5.5 weight ratio (solid content weight) is prepared. The photocatalyst is supported on the silicone resin sheet by applying the methanol mixed solution using a spray to a substrate having the silicone resin sheet obtained in the above step on the surface and drying at 25 ° C. for 12 hours. Complete the production of the decorative board.</p><p num="0054">(Comparative example 1) The same as in Example 1, but heating and pressurizing is performed without using a template plate having a convex shape on the surface.</p><p num="0055">(Evaluation of loss of functional substances) After wiping the surface of the decorative board obtained in Example 1 and Comparative Example 1 with a cloth containing alcohol, the surface of the decorative board is observed with an optical microscope. As a result, in the decorative board of Example 1, TiO was formed inside the recessed groove.₂The residual particles can be confirmed. On the other hand, in the decorative board of Comparative Example 1, TiO completely from the surface.₂It can be confirmed that the particles have been removed. Thus, in Example 1, it is presumed that the functional effect is maintained. On the other hand, in Comparative Example 1, it is presumed that the effect of functionality is not maintained.</p><p num="0056">(Antiviral evaluation) In order to evaluate the antiviral property of the photocatalyst-supported decorative plate obtained in Example 1 and Comparative Example 1, measurement on antiviral property according to the antiviral property test method of JIS R1756 visible light responsive photocatalyst material. I do. The measurement result is expressed by the virus concentration inactivated against Escherichia coli. Here, the concentration of the virus inactivated against Escherichia coli (virus inactivation degree) is used as an index of the virus concentration. Virus inactivity is an antiviral test using bacteriophage, and by measuring the concentration of virus that can infect E. coli using phage virus Qβ concentration: 8.3 million cells / milliliter, it becomes Escherichia coli. On the other hand, it is the result of calculating the concentration of the inactivated virus. That is, the virus inactivity is the degree of concentration that cannot infect Escherichia coli with respect to the concentration of phage virus Qβ, and (phage virus Qβ concentration-concentration of virus that can infect Escherichia coli) / (phage virus). It can be calculated by (Qβ concentration) x 100. It can be said that the higher the virus inactivity value, the better the antiviral property. The concentration of virus that can infect E. coli is measured as follows. A test solution having a known phage virus concentration (8.3 million / milliliter) was dropped onto the decorative plate, irradiated with light according to JIS R 1756 to inactivate the virus, and then the decorative plate was washed with a predetermined amount of water. This is diluted 1000 times, transplanted to Escherichia coli medium and cultured, and the number of inactivated viruses is counted. The concentration of virus that can infect E. coli is calculated from the number of inactivated viruses, the amount of water used for washing, and the dilution rate.</p><p num="0057">The decorative boards of Example 1 and Comparative Example 1 were evaluated when they were placed on the petri dish as they were with respect to the bottom surface of the petri dish (Test 1) and when they were placed at an angle of 45 ° (Test 2).</p><p num="0058">In Test 2, a test solution containing a phage virus is dropped on the upper end of the decorative board. The test liquid flows downward with the surface of the decorative plate facing downward, but in the decorative plate of Example 1, the test liquid stays in the decorative plate and does not reach the bottom surface of the petri dish. On the other hand, in the decorative plate of Comparative Example 1, the dropped test solution flows down from the decorative plate to the bottom surface of the petri dish. In this state, after inactivating the virus by irradiating with light according to JIS R 1756, the decorative board and petri dish of Comparative Example 1 are washed together, and the antiviral properties are evaluated by the methods described above.</p><p num="0059">In test 1, measurement is performed according to JIS R 1756. In Test 1, the concentration of the virus capable of infecting Escherichia coli was 3320 cells / ml or less in both the decorative boards of Example 1 and Comparative Example 1, which corresponds to 99.96% or more in terms of virus inactivity.</p><p num="0060">In Test 2, the concentration of the virus capable of infecting Escherichia coli was 4150 cells / milliliter or less in the decorative board of Example 1, which was 99.95% or more in terms of virus inactivity, and the decorative board of Comparative Example 1 was virus-free. The activity is almost 0%. In the present invention, since the aggregated photocatalyst is supported on the surface resin layer, the virus can be retained even when bacteria and viruses are flowing together with the fluid on the surface of the decorative plate, and the inactivity of the virus is high. Does not decrease.</p>

00611,3 veneer 12 Surface resin layer 13 Resin sheet 14 Functional substances 22 Resin impregnated paper 31 Stencil plate 32 convex shape 120 Base material (phenol resin impregnated paper) 130 recessed pattern