JP6775341B2 - Veneer - Google Patents

Description

The present invention relates to a decorative board.

Conventionally, by adding or applying a functional substance such as a photocatalyst or an antibacterial composition to the surface layer of a decorative board such as a melamine decorative board, a decorative board having functions such as antifouling property and antibacterial property has been provided. ing.

Patent Document 1 describes an antiviral antibacterial coating agent containing octadecylmethyl (3-trimethoxysilylpropyl) ammonium chloride as an antiviral antibacterial agent and didecyldimethylammonium chloride as an antiviral antibacterial accelerator, such as melamine resin. A method of applying to the surface of a resin to form a coating film having antiviral properties has been proposed.

Patent Document 2 describes the silver-based inorganic additive or zinc-based inorganic in an interior decorative sheet having antiviral properties in which a silver-based inorganic additive or a zinc-based inorganic additive is blended in a coating resin on the outermost surface of the decorative sheet. It is characterized in that the true specific gravity of the additive is 2.5 or less, the average particle size is 1 μm or less, and the solid content ratio is 10 to 30% with respect to the coating resin on the outermost surface of the decorative sheet. A decorative sheet for interior decoration has been proposed.

Japanese Unexamined Patent Publication No. 2013-71893 JP-A-2015-80887

The method of forming an antiviral coating film described in Patent Document 1 on a resin surface is applied to furniture such as desks, tables, counters, floors, stairs, etc. where a human body or cleaning tools often come into contact with the surface. In that case, the coating film is easily worn or peeled off due to wiping with water or contact with limbs, etc., and the antiviral property of furniture, etc. to which antiviral property is imparted deteriorates over time. was there.

Further, also in the interior decorative sheet described in Patent Document 2, the particulate additive of the silver-based inorganic additive or the zinc-based inorganic additive similarly adhering to the surface of furniture or the like can be wiped with water or with the human body. There is a problem that it is easy to fall off from the surface due to contact or the like, and the antiviral property, antibacterial property, etc. of furniture to which antiviral property is imparted deteriorates with time.

The present invention has been made in view of such a problem, and has antibacterial properties and antibacterial properties even in an environment where the human body, cleaning tools, etc. are in good contact with the surface while keeping the influence on the design property small. An object of the present invention is to provide a decorative board capable of maintaining an effect such as virality for a long period of time.

In order to achieve the above object, the decorative board of the present invention is a decorative board composed of a substrate and a surface resin layer laminated on one or both sides of the substrate. It is characterized by containing a bis-type quaternary ammonium salt.

In the decorative board of the present invention, the bis-type quaternary ammonium salt has antibacterial and antiviral properties. Therefore, the decorative board of the present invention containing the bis-type quaternary ammonium salt has antibacterial and antiviral properties. It is viral.

In the decorative board of the present invention, it is desirable that the surface resin layer contains a melamine resin.
In the decorative board of the present invention, the bis-type quaternary ammonium salt has a relatively higher compatibility with the melamine resin than the mono-type quaternary ammonium salt, and therefore, in a state of being dissolved in the melamine resin. Even if it exists and is in an environment where the human body, cleaning tools, etc. are in good contact with the surface, it is not removed. As a result, the decorative board of the present invention can maintain the effects such as antibacterial property and antiviral property.

In the decorative board of the present invention, it is desirable that the screw-type quaternary ammonium salt is contained in an amount of 0.1 to 5% by weight based on the solid content of the resin contained in the surface resin layer.
In the decorative board of the present invention, when the screw-type quaternary ammonium salt is contained in an amount of 0.1 to 5% by weight based on the solid content of the resin contained in the surface resin layer, the surface of the decorative board is sufficient. Has antibacterial and antiviral properties.

In the decorative board of the present invention, it is desirable that the bis-type quaternary ammonium salt is a bis-type pyridinium salt.
In the decorative board of the present invention, when the bis-type pyridinium salt is blended in the melamine resin constituting the surface resin layer, the pyridine ring constituting the bis-type pyridinium salt and the triazine ring constituting the melamine resin are mixed. However, since the bis-type pyridinium salt has a steric hindrance to the pyridine ring, even if the bis-type pyridinium salt is added to the melamine resin, it becomes difficult to mix at the molecular level, and the bis-type pyridinium salt is difficult to mix in the surface resin layer. It is presumed that the high concentration region of the bis-type pyridinium salt is dispersed in the matrix of the low concentration region of the bis-type pyridinium salt to form a so-called domain structure. Therefore, in the high concentration region, as time passes, the bis-type pyridinium salt elutes into the water adhering to the surface of the decorative board, and the bis-type pyridinium salt is gradually released to the surface of the decorative board, so-called. Shows sustained release. As a result, in the decorative board of the present invention, even in an environment where the human body, cleaning tools, etc. are in good contact with the surface, the screw-type pyridinium salt is supplied to the surface one after another, so that it has antibacterial and antiviral properties. Effects such as sex can be maintained for a long period of time.

Further, in the decorative board of the present invention, since the amount of the screw-type pyridinium salt dissolved in the melamine resin is small, the influence on the design can be minimized.

（一般式（１）中、Ｒ^１及びＲ^２は、同一または異なっていてもよいアルキル基、Ｒ^３はエーテル結合を含んでもよい有機基であり、Ｘ⁻は、ハロゲン陰イオンを示す。） In the decorative board of the present invention, it is desirable that the surface resin layer contains a screw-type pyridinium salt represented by the following general formula (1).

(In the general formula (1), R ¹ and R ² are alkyl groups which may be the same or different, R ³ is an organic group which may contain an ether bond, and X ⁻ represents a halogen anion.)

In the decorative board of the present invention, when the bis-type pyridinium salt is the bis-type pyridinium salt represented by the above general formula (1), the above-mentioned effect of the present invention can be more easily exhibited.

In the decorative board of the present invention, in the above general formula (1), R ³ is -CO-O- (CH ₂ ) _6- O-CO-, -CONH- (CH ₂ ) _6- CO-, -NH-. CO- (CH ₂ ) _4- CO-NH-, -S-Ph-S-, -CONH-Ph-NHCO-, -NHCO-Ph-CONH-, -O- (CH ₂ ) _6- O- or- It is desirable that it is represented by CH ^2- O- (CH ₂ ) _4- O-CH _2- (where Ph represents a phenylene group).

In the decorative board of the present invention, when R ³ is the above-mentioned group in the above general formula (1), the effect of the present invention is more easily exhibited.

In the decorative board of the present invention, the bis-type pyridinium salt represented by the above general formula (1) is 1,1'-didecyl-3,3'-[butane-1,4-diylbis (oxymethylene)] dipyridinium. = It is desirable that it is dibromid.
In the decorative board of the present invention, when the bis-type pyridinium salt is the above-mentioned compound, the above-mentioned effect can be most effectively exhibited.

In the decorative board of the present invention, it is desirable that the bis-type quaternary ammonium salt is a bis-type quinolinium salt or a bis-type thiazolium salt.
In the decorative plate of the present invention, when the bis-type quaternary ammonium salt is a bis-type quinolinium salt or a bis-type thiazolium salt, it has antibacterial and antiviral properties like the bis-type pyridinium salt. As in the case of pyridinium salt, even in an environment where the human body or cleaning tools are in good contact with the surface, the bis-type quinolinium salt or bis-type thiazolium salt is supplied to the surface one after another, so that it has antibacterial properties. The antiviral effect can be maintained for a long period of time.

In the decorative board of the present invention, it is desirable that the quaternary ammonium salt is blended in a state of being dissolved in the melamine resin.
If the quaternary ammonium salt is blended in a state where it is not dissolved in the melamine resin at all, it becomes granular, so even if the quaternary ammonium salt is present on the surface of the decorative board, the human body, cleaning tools, etc. It will be removed by contact. On the other hand, since the quaternary ammonium salt existing inside the surface resin layer does not move to the surface, the effect such as antiviral property may be gradually reduced. However, in the decorative board of the present invention, if the quaternary ammonium salt is blended in the melamine resin in a dissolved state, it is gradually released to the surface of the decorative board or in the air as described above. Since it dissolves in the water and is exposed on the surface, it is possible to maintain antibacterial and antiviral effects for a long period of time even in an environment where the human body or cleaning tools are in good contact with the surface. It will be possible.

In the decorative board of the present invention, in the surface resin layer, the high concentration region having a high concentration of the bis-type quaternary ammonium salt is dispersed in the matrix of the low concentration region having a low concentration of the bis-type quaternary ammonium salt. It is desirable to be.
In the surface resin layer of the decorative board of the present invention, when the high concentration region is dispersed in the matrix of the low concentration region, the quaternary ammonium salt is gradually released from the high concentration region to the surface of the decorative board. Since it is easy to show the sustained release property, it is possible to maintain the effects such as antibacterial and antiviral properties for a long period of time even in an environment where the human body and cleaning tools are in good contact with the surface. Become.

In the decorative board of the present invention, it is desirable that the surface resin layer contains a silicone resin and / or a silane coupling agent.

FIG. 1 is a schematic cross-sectional view schematically showing the decorative board of the present invention. FIG. 2 is a schematic cross-sectional view schematically showing another example of the decorative board of the present invention. FIG. 3 is a schematic cross-sectional view showing still another example of the decorative board of the present invention.

Hereinafter, the decorative board of the present invention will be described in detail.
The decorative board of the present invention is a decorative board composed of a substrate and a surface resin layer laminated on one or both sides of the substrate, and a bis-type quaternary ammonium salt is contained in the surface resin. It is characterized by being blended.

FIG. 1 is a schematic cross-sectional view schematically showing the decorative board of the present invention.
In the decorative board 10 of the present invention, a surface resin layer 12 is provided on the substrate 11, and a bis-type quaternary ammonium salt is blended in the surface resin layer 12.

In the decorative board of the present invention, the bis-type quaternary ammonium salt has antibacterial and antiviral properties. Therefore, the decorative board of the present invention containing the bis-type quaternary ammonium salt has antibacterial and antiviral properties. It is viral. In particular, if the bis-type quaternary ammonium salt is dissolved in the resin constituting the surface resin layer, it is dissolved by moisture in the air and exposed on the surface, so that it has antibacterial and antiviral properties. You can exert your sexuality more effectively.

The bis-type quaternary ammonium salt is not particularly limited, but is represented by the following general formula (1), a bis-type pyridinium salt, a bis-type quinolinium salt, a bis-type thiazolium salt, and the following general formula (2). ) Is desirable.

（上記一般式（１）中、Ｒ^１及びＲ^２は、同一または異なっていてもよいアルキル基、Ｒ^３はエーテル結合を含んでもよい有機基であり、Ｘ⁻は、ハロゲン陰イオンを示す。）

(In the above general formula (1), R ¹ and R ² are alkyl groups which may be the same or different, R ³ is an organic group which may contain an ether bond, and X ⁻ represents a halogen anion. )

（上記一般式（２）中、Ｒ^４は、官能基を有してもよいアルキル基を表し、Ｒ^５、Ｒ^６、Ｒ^７、Ｒ^８、Ｒ^９及びＲ^１０は、アルキル基を表し、Ｙ⁻はハロゲン陰イオンを表す。）

(In the above general formula (2), R ⁴ represents an alkyl group which may have a functional group, and R ⁵ , R ⁶ , R ⁷ , R ⁸ , R ⁹ and R ¹⁰ represent an alkyl group. Y ⁻ represents a halogen anion.)

First, the bis-type pyridinium salt represented by the general formula (1) will be described.
In the screw-type pyridinium salt represented by the general formula (1), examples of X ⁻ include Cl ⁻ , Br ⁻ , I ^{− and the} like.
R ¹ and R ² are preferably an alkyl group having 1 to 20 carbon atoms, and the alkyl group may have a side chain.
In the above general formula (1), the organic group represented by R ³ is -CO-O- (CH ₂ ) _6- O-CO-, -CONH- (CH ₂ ) _6- CO-, -NH-CO. -(CH ₂ ) _4- CO-NH-, -S-Ph-S-, -CONH-Ph-NHCO-, -NHCO-Ph-CONH-, -O- (CH ₂ ) _6- O- or -CH It is desirable that it is represented by ^2- O- (CH ₂ ) _4- O-CH _2- (where Ph represents a phenylene group).

上記一般式（３）中、Ｒ^１１は、Ｃ_ｎＨ_２ｎ＋１で表されるアルキル基であり、ｎは、８、１０、１２、１４、１６または１８が望ましい。また、ｍは、３、４、６、８、１０が望ましい。以下に示す化合物の置換基Ｒ^１１についても、同様である。 Specifically, examples of the bis-type pyridinium salt include those represented by the following general formulas (3) to (10).

In the above general formula (3), R ¹¹ is an alkyl group represented by C _n H _{2n + 1} , and n is preferably 8, 10, 12, 14, 16 or 18. Further, m is preferably 3, 4, 6, 8 and 10. Substituents R ¹¹ of the compound shown below is also the same.

As the bis-type pyridinium salt, 1,1'-didecyl-3,3'-[butane-1,4-diylbis (oxymethylene)] dipyridinium = dibromid represented by the following chemical formula (11) is used. Especially desirable.

Next, the screw-type thiazolium salt will be described.
Further, examples of the screw-type thiazolium salt include a screw-type thiazolium salt represented by the following general formula (12).

Next, the bis-type quinolinium salt will be described.
As the bis-type quinolinium salt, a pyridinium group represented by the following chemical formula (13) constituting the bis-type pyridinium salt represented by the above general formulas (3) to (10) is used in the following chemical formula (14). Examples thereof include a bis-type quinolinium salt having a chemical structure substituted with the quinolium group shown in. In the bis-type quinolinium salt, other substituents and the like are the same as those of the bis-type pyridinium salt represented by the general formulas (3) to (10).

上記一般式（２）中、Ｒ^４は、官能基を有してもよいアルキル基を示す。アルキル基は、側鎖を有してもよく、その炭素数は、１〜２０が望ましい。上記官能基としては、ヒドロキシル基、アルデヒド基、カルボキシル基、シアノ基、ニトロ基、アミノ基、エーテル基等が挙げられる。また、Ｒ^５、Ｒ^６、Ｒ^７、Ｒ^８、Ｒ^９及びＲ^１０は、アルキル基を表し、上記アルキル基は、側鎖を有してもよく、その炭素数は、１〜２０が望ましい。Ｙ⁻はハロゲン陰イオンを表す。Ｙ⁻としては、例えば、Ｃｌ⁻、Ｂｒ⁻、Ｉ⁻が挙げられる。 Furthermore, the compound represented by the following general formula (2) used in the present invention will be described.

In the above general formula (2), R ⁴ represents an alkyl group which may have a functional group. The alkyl group may have a side chain, and the number of carbon atoms thereof is preferably 1 to 20. Examples of the functional group include a hydroxyl group, an aldehyde group, a carboxyl group, a cyano group, a nitro group, an amino group and an ether group. Further, R ⁵ , R ⁶ , R ⁷ , R ⁸ , R ⁹ and R ¹⁰ represent an alkyl group, and the above alkyl group may have a side chain, and the number of carbon atoms thereof is preferably 1 to 20. .. Y ⁻ represents a halogen anion. Examples of Y ⁻ include Cl ⁻ , Br ⁻ , and I ⁻ .

Examples of the compound represented by the general formula (2) include 2,3-bis (hexadecyldimethylammonium bromide) -1-propanol and the like.

The above-mentioned screw-type quaternary ammonium salt is blended in the surface resin layer, and the blending ratio thereof is 0.1 to 5% by weight with respect to the solid content of the resin contained in the surface resin layer. It is desirable that it is done.
If the blending ratio of the bis-type quaternary ammonium salt is less than 0.1% by weight, the antibacterial and antiviral effects are not exhibited, while the blending ratio of the bis-type quaternary ammonium salt is 5. Even if it exceeds% by weight, the antibacterial and antiviral effects do not change so much, the influence on the design of the decorative board becomes large, and the design deteriorates.

It is desirable that the screw-type quaternary ammonium salt is dissolved in the surface resin layer. When the bis-type quaternary ammonium salt is dissolved in the surface resin layer, the bis-type quaternary ammonium salt is eluted on the surface due to moisture in the air or the like, so that the sustained release property is excellent.

When a melamine resin is used as the resin constituting the surface resin layer and a bis-type pyridinium salt is used as the bis-type quaternary ammonium salt, the pyridine ring constituting the bis-type pyridinium salt and the triazine ring constituting the melamine resin are used. However, since the bis-type pyridinium salt has a steric hindrance to the pyridine ring, even if the bis-type pyridinium salt is added to the melamine resin, it becomes difficult to mix at the molecular level, and the above-mentioned in the surface resin layer. It is presumed that the high concentration region of the bis-type pyridinium salt is dispersed in the matrix of the low concentration region of the bis-type pyridinium salt to form a so-called domain structure.

FIG. 2 is a schematic cross-sectional view showing a decorative board having the above-described configuration.
As shown in FIG. 2, in the decorative board 20, in the surface resin layer 22 formed on the substrate 11, the high concentration region 22a of the bis-type pyridinium salt is dispersed in the matrix of the low concentration region 22b of the bis-type pyridinium salt. The domain structure is formed.

Therefore, in the high concentration region 22a, the bis-type pyridinium salt is eluted into the water adhering to the surface of the decorative plate with the passage of time, and the bis-type pyridinium salt is gradually released to the surface of the decorative plate 20, so-called. Shows sustained release. As a result, in this decorative board 20, even in an environment where the human body, cleaning tools, etc. are in good contact with the surface, the screw-type pyridinium salt is supplied to the surface one after another, so that the antibacterial property, antiviral property, etc. The effect of can be maintained for a long period of time.

The substrate used for the decorative board of the present invention is not particularly limited, and a non-combustible base material such as core paper or magnesia cement generally used for the decorative board 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. As the core paper, for example, aluminum hydroxide papermaking can be used. The core paper can be impregnated with phenolic resin. Further, the core paper and the magnesia cement non-combustible base material can be laminated to form a substrate.

The magnesia cement non-combustible substrate can be used alone, or can be laminated and arranged in the center of the core paper to form a substrate. The magnesia cement non-combustible plate is manufactured by mixing magnesium oxide (MgO) and magnesium chloride (MgCl ₂ ), further adding aggregate and water, kneading, and forming 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 plate, a glass fiber layer formed in a mesh shape or the like can be provided as an intermediate layer.

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, fluororesin, guanamine resin and the like. Among these, it is desirable to use a melamine resin.

The melamine resin is a resin having 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.

The 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. At that time, the melamine resin-containing solution is mixed with screws. A melamine resin-containing solution containing a bis-type quaternary ammonium salt is prepared by adding a type quaternary ammonium salt. In order to impart bending workability to the melamine resin-impregnated paper, a solution containing a plasticizer can be further impregnated 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 can be 80 to 150 g / m ² in consideration of the thickness and weight of the pattern paper. The heating and drying temperatures can be set to 100 to 150 ° C. in order to firmly fix the melamine resin to the pattern paper.

The surface resin layer constituting the decorative board of the present invention may be a decorative layer in which a printing paper on which a pattern or a color is printed is impregnated with a resin, and when the amount of the filler is 15% or less and the resin is impregnated. May be an overlay layer in which a translucent overlay paper is impregnated with a resin. When the surface resin layer is an overlay layer, the decorative layer is provided below the overlay layer. When the surface resin layer is an overlay layer, the overlay paper is impregnated with a resin containing a screw-type quaternary ammonium salt.

FIG. 3 is a schematic cross-sectional view schematically showing a decorative board having an overlay layer.
As shown in FIG. 3, in the decorative board 30, an overlay layer 33 is provided on the surface resin layer 32, and the overlay layer 33 contains a screw-type quaternary ammonium salt.
Therefore, the decorative board 30 exhibits antibacterial and antiviral properties.

The filler is an inorganic particle (filler) for adjusting whiteness and smoothness by adding it to paper, and at least one selected from calcium carbonate, talc, clay and kaolin is desirable. Since the filler is inorganic particles, the content of the filler can be calculated from the weight of the paper and the weight of the ash remaining after heating the paper.

In the decorative board of the present invention, it is desirable that the surface resin layer contains a silicone resin and / or a silane coupling agent. When the surface resin layer contains a silicone resin and / or a silane coupling agent, curability can be imparted to the melamine resin or the like.

As 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 hydradino group, an epoxy group, a methacryl group, a carboxyl group, a carbinol group and the like can be introduced.

As the silane coupling agent, for example, one having a functional group such as a vinyl group, a propenyl group, a butadienyl group, a styryl group, an acryloyl group, a methacryloxy group, an amino group, a mercapto group and an isocyanate group is desirable. Examples of the silane coupling agent include vinyl trichlorosilane, vinyl trimethoxysilane, vinyl triethoxysilane, vinyl triisopropoxysilane, allyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 2- (3,4). -Epoxycyclohexyl) ethyltrimethoxysilane, p-styryltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane , 3-Triethoxysilyl-N- (1,3-dimethyl-butylidene) propylamine, diallyldimethylsilane, 3-mercaptopropyltrimethoxysilane, 3-isosianetpropyltriethoxysilane and the like.

Next, the method for producing the decorative board of the present invention will be described.
First, 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 base material. Since the above-mentioned substrate and the method for manufacturing the same have been described in the description of the decorative board of the present invention, they will be omitted here.

In the decorative board of the present invention, the method of forming the surface resin layer on the surface of the substrate is not particularly limited, and can be performed by a general method. As a specific method for forming the surface resin layer, for example, one side or both sides of a substrate made of a laminated core paper is impregnated with a resin such as a melamine resin containing a screw-type quaternary ammonium salt produced by the above method. Examples thereof include a laminating step of laminating the resin-impregnated paper and a hot-press molding step of hot-press molding a substrate on which the resin-impregnated paper such as melamine resin is laminated. 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. An overlay layer may be provided as the surface resin layer.

The temperature of the decorative board 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 ² ) can be set as the pressurizing condition. Can be done. 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 substrate 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.

When the surface resin layer contains a silicone resin and / or a silane coupling agent in order to harden the surface resin layer, the silicone resin and / or the silane coupling agent is contained in the melamine resin solution. A method of impregnating the surface resin layer with a silicone resin and / or a silane coupling agent can be used.

(Example 1)
(Primary melamine impregnation process)
An antibacterial agent (1,1'-didecyl-3,3'-[butane-] consisting of a melamine resin and a bis-type quaternary ammonium salt shown in Table 1 below is prepared by using a roll paper having a thickness of 0.2 to 0.3 mm. 1,4-Diylbis (oxymethylene)] dipyridinium = dibromid) is immersed in a solution containing. At that time, 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. As shown in Table 1, the content ratio of the antibacterial agent to the melamine resin is 1.66 wt%. The moving speed of the roll paper is 10 to 20 cm / sec.
(Drying process)
The roll paper that has passed through the melamine solution is dried by a dryer (OVEN PH-201 manufactured by ESPEC) at a temperature of 100 ° C. and a drying time of 30 seconds.

(Secondary melamine impregnation process)
The roll paper that has undergone the drying step is immersed in a solution made of a melamine resin containing the antibacterial agent shown in Table 1 at the above ratio. 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 solution is dried by a dryer so that the temperature is 100 ° C. and the drying time is 2 hours. After drying, it is cut into 910 mm × 1820 mm.

(Combination process)
Four sheets of phenolic resin-impregnated core paper having a thickness of 0.3 to 0.4 mm are laminated, and the melamine resin-impregnated paper obtained in the above step is laminated thereto, and the temperature is 143 ° C. and the pressing pressure is 80 kg / by a press machine. A decorative board is produced by thermocompression bonding in cm ² and a press time (including temperature rise time) of 50 minutes.

(Examples 2 to 9)
A decorative board was prepared in the same manner as in Example 1 except that the antibacterial agent shown in Table 1 was added to the solution containing the melamine resin as the bis-type quaternary ammonium salt so as to have the content ratio shown in Table 1. did.

(Comparative Example 1)
A decorative board was prepared in the same manner as in Example 1 except that didodecyldimethylammonium, which is a quaternary ammonium salt, was used instead of the quaternary ammonium salt.

(Antiviral evaluation)
In order to evaluate the antiviral property of the decorative board containing the bis-type quaternary ammonium salt obtained in each Example and Comparative Example, the antiviral property is related according to the antiviral property test method of JIS R1756 photocatalytic material. The measurement was performed.
A solution containing bacteriophage Qβ was added dropwise to the surface of the decorative board sterilized by ultraviolet irradiation, and the solution was held on the surface of the decorative board for 4 hours, then the solution was recovered and the residual virus concentration was measured.

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 a 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 at which Escherichia coli cannot be infected with respect to the phage virus Qβ concentration (phage virus Qβ concentration-concentration of virus capable of infecting Escherichia coli) / (phage virus). It can be calculated by (Qβ concentration) × 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 cells / milliliter) was dropped onto a decorative plate, irradiated with light according to JIS R1756 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.

In addition, the virus inactivity is calculated from the virus inactivity.
The virus inactivity is a numerical value (negative) indicated by the common logarithm log (1-X) when the amount of the original virus is 1 and the relative amount of the virus deactivated after the virus deactivation process is X. (Indicated by the value), and the larger the absolute value, the higher the ability to inactivate the virus. For example, if 99.9% of the original virus is inactivated, the virus inactivity is expressed as log (1-0999) = −3.00. The ratio of the amount of virus deactivated after the virus deactivation process to the total amount of virus before the virus deactivation process is expressed in% (99.9% in the above case) is called the virus inactivation degree.
The measurement results are shown in Table 1 together with the blending amount (wt%) of the bis-type quaternary ammonium salt. Table 1 shows the degree of virus inactivity. This is because the virus inactivity can be derived from the virus inactivity.

(Abrasion test)
In order to evaluate the antiviral wear resistance of each of the produced melamine decorative boards, AA-180 abrasive paper was used and worn 200 times under a load of 1000 Pa, and a load due to wear was applied to the surface.

(Wipe durability test)
In order to evaluate the durability of each melamine decorative board produced by wiping with water, a microfiber cloth moistened with water was used, and the melamine decorative board was wiped 36,500 times with a weight of 1000 Pa, and a load was applied by wiping with water.

(Antiviral test)
The antiviral properties of the melamine decorative board after the abrasion test and the water wiping durability test and the decorative board (initial stage) not subjected to the durability test were evaluated. The antiviral function was evaluated by the degree of inactivity after each load. The results are shown in Table 1. In Table 1, after the water wiping durability test is described as after the water wiping test.

As is clear from Examples 1 to 9 in Table 1 above, the decorative board according to Examples 1 to 9 has a virus inactivity of better than -3 even after the abrasion resistance test and the water wiping test. doing. The water wiping test is a test assuming that water wiping is performed 10 times a day for 365 days every day for 10 years, and even after 10 years, the virus inactivity is superior to -3, that is, influenza virus. It is able to maintain the ability to inactivate such substances to the extent that they lose their infectivity.

On the other hand, in Comparative Example 1, even if the initial value is high, the virus inactivation degree is lowered by the water wiping test, and the continuity of the antiviral function is inferior. The rate of decrease in the degree of inactivity from the initial value to after the wiping test is the lowest in Example 1, and it is considered that the antiviral function can be guaranteed for a long period of time.

10, 20, 30 Decorative board 11, 31 Substrates 12, 22, 32 Surface resin layer 22a High concentration region 22b Low concentration region 33 Overlay layer

Claims (11)

With the board
A decorative board composed of a surface resin layer laminated on one or both sides of the substrate.
A screw-type quaternary ammonium salt is blended in the surface resin .
The surface resin layer is characterized in that a high concentration region having a high concentration of the bis-type quaternary ammonium salt is dispersed in a matrix of a low concentration region having a low concentration of the bis-type quaternary ammonium salt. Veneer. The decorative board according to claim 1, wherein the surface resin layer contains a melamine resin. The decorative board according to claim 1 or 2, wherein the screw-type quaternary ammonium salt is contained in an amount of 0.1 to 5% by weight based on the solid content of the resin contained in the surface resin layer. The decorative board according to any one of claims 1 to 3, wherein the bis-type quaternary ammonium salt is a bis-type pyridinium salt. The decorative board according to any one of claims 1 to 4, wherein the screw-type quaternary ammonium salt is a screw-type pyridinium salt represented by the following general formula (1).

(In the general formula (1), R ¹ and R ² are alkyl groups which may be the same or different, R ³ is an organic group which may contain an ether bond, and X ⁻ represents a halogen anion.) In the general formula (1), R ³ is -CO-O- (CH ₂ ) _6- O-CO-, -CONH- (CH ₂ ) ₆ -CO-, -NH-CO- (CH ₂ ) ₄ -CO-NH-, -S-Ph-S-, -CONH-Ph-NHCO-, -NHCO-Ph-CONH-, -O- (CH ₂ ) _6- O- or -CH ^2- O- (CH) ₂ ) The decorative board according to claim 5, which is represented by _4- O-CH _2- (where Ph represents a phenylene group). The bis-type pyridinium salt is according to any one of claims 4 to 6, wherein 1,1'-didecyl-3,3'-[butane-1,4-diylbis (oxymethylene)] dipyridinium = dibromid. Veneer. The decorative board according to any one of claims 1 to 3, wherein the bis-type quaternary ammonium salt is a bis-type quinolinium salt. The decorative board according to any one of claims 1 to 3, wherein the screw-type quaternary ammonium salt is a screw-type thiazolium salt. The decorative board according to any one of claims 1 to 9, wherein the screw-type quaternary ammonium salt is blended in a state of being dissolved in the melamine resin. The decorative board according to any one of claims 1 to 10 , wherein the surface resin layer contains a silicone resin and / or a silane coupling agent.

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