JP4798273B2 - Wood board having antiallergenicity and method for producing the same - Google Patents

Description

  The present invention relates to a wood board that can suppress mite, pollen and pet-derived allergen substances, and can be applied to residential building materials and the like, and a method for producing the same.

  In recent years, one in three people in Japan are said to suffer from allergic diseases such as atopic dermatitis, bronchial asthma and allergic rhinitis. Causes of allergic diseases include mites, pollen, mold, pet hair and the like.

  Particularly, dust mite allergens (hereinafter referred to as “mite allergens”), which account for 70% or more of mites detected from indoors, are a problem. The dust mites are said to be allergens such as worms, carcasses, shells, and huns. Among them, the mite allergen derived from dung has the high allergen activity, and the particles are very small and easily soared.

  In general, it is considered that the flooring floor in the room is almost free of mite allergens compared to carpets and tatami mats. However, in recent years, it has been reported that mite allergens also exist on the flooring floor, which greatly exceeds the guidelines provided by the Ministry of Health, Labor and Welfare. Also, mite allergens present on the flooring are very easy to soar, and even a small amount has been reported to be as dangerous to the human body as carpets contaminated with ticks, removing allergen particles from the flooring floor. This is very effective in preventing allergic diseases.

  In addition, mite allergens and pet-derived allergens that are very small and easily fluttered also adhere to the wall surface of the room, and they are regarded as a problem because they are very likely to rise during cleaning.

  Examples of a method for reducing and removing mite allergens that have accumulated and adhered to the flooring and the wall surface include a method for removing mite allergens with a vacuum cleaner or a mop. However, mite allergens are very small and easily soared that it was virtually impossible to remove them completely.

  On the other hand, as a method for suppressing allergens present in the room, a method of applying an antiallergen agent such as zirconium salt to a building material has been proposed (see Patent Document 1).

  Further, as a method for suppressing allergens present on the indoor flooring floor, a method of applying a floor polish containing an anti-allergen agent has been proposed (see Patent Document 2). Allergens can be suppressed by regularly applying a floor polish containing an anti-allergen agent.

  However, in the method described in Patent Document 2, the abrasion resistance of the floor polish or the contamination resistance such as chemical resistance and alkali resistance is poor, and seasonings such as pet manure, alcohol and vinegar, When a detergent or a bleaching agent adheres, it easily causes peeling, elution, whitening, etc., and cannot always be a sufficient measure for allergen suppression.

  In order to solve this problem, a water-insoluble polymer having a phenolic hydroxyl group as an antiallergenic agent is used, and a curable resin composition containing active energy rays such as ultraviolet rays and electron beams containing the polymer is used as a wooden substrate. The flooring which formed the coating film containing an anti-allergen agent on the surface by apply | coating to and hardening | curing is proposed (refer patent document 3). In this flooring material, durability such as scratch resistance and contamination resistance is imparted to the coating film containing the anti-allergen agent.

JP 2001-212806 A JP 2001-214130 A JP 2008-239721 A

  According to the flooring described in Patent Document 3, anti-allergen is expected to be exhibited for a longer period of time than before by including an anti-allergen agent in the coating film.

  However, when the coating film is scratched in the flooring environment, if the wax is applied to maintain aesthetics, the wax film makes it difficult for the allergen to come into contact with the anti-allergen agent, and exhibits anti-allergenic properties. The problem of being disturbed is pointed out.

  The present invention has been made in view of the circumstances as described above, and is applicable to flooring and the like that can hardly exhibit scratches on the surface and can continuously exhibit antiallergenicity for a long period of time. It is an object to provide a wood board having allergenic properties and a production method for producing the wood board.

  The present invention has the following features in order to solve the above problems.

  The first invention relates to a wood board having antiallergenicity, comprising a plate-like wood base material, and a functional layer disposed on the surface of the wood base material and formed from a plurality of two or more layers, The outermost surface layer located on the outermost side of the functional layer is an antiallergenic wood board containing an antiallergenic agent, and the functional layer has a thickness of 50 to 50 immediately below the outermost surface layer. A thick film layer of 100 μm is formed, and this thick film layer is a single layer.

  The second invention is characterized in that, in the feature of the first invention, the thick film layer is formed as a coating film of a paint composed of a curable resin composition.

  The third invention is characterized in that, in the feature of the second invention, the curable resin composition is an active energy curable resin composition.

  According to a fourth aspect of the present invention, in the feature of the second or third aspect, a decorative groove is formed on a surface portion of the wooden base material, and the paint accumulates in the decorative groove and the curable resin composition is used. A filling layer is formed.

  A fifth invention relates to a method for producing an antiallergenic wood board having the above first feature, wherein a part or all of the thick film layer is coated with a paint composed of a curable resin composition by a flow coater. It is characterized by being formed by coating.

  A sixth invention is characterized in that, in the feature of the fifth invention, the curable resin composition is an active energy curable resin composition.

  According to a seventh aspect, in the feature of the fifth or sixth aspect, the paint is collected in a decorative groove formed on a surface portion of the wooden substrate, and a filling layer of the curable resin composition is formed. It is characterized by that.

  According to the first aspect, in the functional layer disposed on the surface of the wood substrate, a single thick film layer having a thickness of 50 to 100 μm is formed immediately below the outermost surface layer containing the anti-allergen agent. Therefore, the thick film layer makes it difficult to damage the outermost surface layer, and it is possible to maintain aesthetics. There is no need to apply wax to the outermost surface layer. Therefore, the wood board which has antiallergenicity can exhibit antiallergenicity continuously over a long period of time.

  According to the second invention, in addition to the effects of the first invention, the thick film layer is formed as a coating film of a paint composed of a curable resin composition. It is easily formed, dense and has good durability.

  According to the third aspect of the invention, in addition to the effects of the second aspect of the invention, the curable resin composition is an active energy curable resin composition. Can be formed more easily.

  According to the fourth aspect of the invention, in addition to the effects of the second or third aspect of the invention, the paint accumulates in the decorative groove formed on the surface portion of the wooden base material to form a filling layer of the curable resin composition. Therefore, the allergen substance is suppressed from being deposited in the makeup groove. The decrease in antiallergenicity associated with the formation of the decorative groove can be suppressed, and can be easily realized.

  According to the fifth aspect of the invention, part or all of the thick film layer is formed by applying the paint composed of the curable resin composition with the flow coater, so that the thick film layer has a thickness of 50 to 100 μm. It is easily formed into a thick film. In addition, since the thick film layer is formed as a single layer, there is no risk of delamination in the case of multiple layers, a thick film layer with good quality is obtained, and the durability of the outermost surface layer is sufficiently secured can do. In addition, irregularities that do not hinder the appearance are formed on the surface of the thick film layer, and even if the outermost surface layer is scratched, the scratches are not conspicuous, and the surface of the wooden board slips due to the irregularities. It becomes difficult and sticky.

  According to the sixth invention, in addition to the effect of the fifth invention, a coating film can be easily formed in a short time as in the third invention, and the thick film layer can be easily formed. can do.

  According to the seventh invention, in addition to the effects of the fifth or sixth invention, it is possible to suppress the allergen substance from accumulating in the cosmetic groove as in the fourth invention. The decrease in antiallergenicity associated with the formation of the decorative groove can be suppressed, and can be easily realized.

(A) (b) is the principal part perspective view and sectional drawing which showed one Embodiment of the wood board which has the antiallergenic property of this invention, respectively. It is principal part sectional drawing which expanded and showed the decorative groove and its periphery in the wooden board shown in FIG. (A) (b) (c) is sectional drawing which showed one form of the wooden base material used for the wooden board shown in FIG. 1, respectively. It is principal part sectional drawing which expanded and showed the decorative groove and its periphery in the wood board of the comparative example 2. FIG.

  As described above, FIGS. 1A and 1B are a perspective view and a cross-sectional view showing a main part of an embodiment of the wood board having antiallergenicity of the present invention, respectively. FIG. 2 is an enlarged cross-sectional view of the decorative groove and its periphery in the wood board shown in FIG. FIGS. 3A, 3B and 3C are cross-sectional views showing the main parts of the wood base material in the wood board shown in FIG.

  The wood board 1 of this embodiment is used as the flooring 2.

  That is, as shown in FIG. 1, the wood board 1 exhibits a plate-like wood base material 3 and various functions (particularly antiallergenicity in the present invention) disposed on the surface of the wood base material 3. Functional layer 4 to be provided. As will be described later, the functional layer 4 is formed of a plurality of layers of two or more layers.

  Further, since the wooden board 1 is used as a flooring 2, a concave female fruit 5 is formed at the side end of the wooden base 3, that is, the left end, and a convex male is formed at the right end. Real 6 is formed. When the wooden board 1 is laid on the floor base portion of the building as the flooring material 2, the male seed 6 and the female seed 5 are respectively the male seed 6 and the female seed 5 between the two adjacently arranged on the left and right. It has a shape that can be fitted. Specifically, the outer peripheral shape of the male fruit 6 and the inner peripheral shape of the female fruit 5 are substantially the same. Such female seeds 5 and male seeds 6 are formed in the same manner not only on the left and right side ends of the wooden base 3 but also on the front and rear ends that are spaced apart in the longitudinal direction of the wooden base 3. Is done.

  Furthermore, two decorative grooves 7 having a substantially V-shaped cross section are formed on the wooden board 1 in the longitudinal direction of the wooden base material 3 on the surface of the wooden base material 3. The two decorative grooves 7 are spaced apart from each other on the surface portion of the wooden substrate 3. The decorative groove 7 is formed as a joint or the like, for example, in order to improve design properties such as making a three-dimensional appearance appear on the floor surface formed by laying the flooring 2.

  As shown in FIGS. 2 and 3A, the wood base 3 is formed by bonding a veneer 9, which is a single wood plate for makeup, to the surface of the plywood 8.

The wood base material 3 applicable to the wood board 1 is not limited to the above-mentioned configuration. In addition to the plywood 8, the particle board (Particle Board (PB)) and the medium density fiber board (Medium Density Fiberboard (MDF)). In addition, a mixed board (Wood Plastic Board (WPB)) formed by molding a mixture of wood powder and resin into a plate shape, or a composite of these including a plywood 8 may be used. The wood substrate 3 shown in FIG. 3B is formed by bonding the MDF 10 to the surface of the plywood 8 to be combined, and bonding the veneer 9 to the surface of the MDF 10. 3C is a resinous decorative sheet 12 in which a WPB 11 is bonded to the surface of the plywood 8 to form a composite, and a wood grain pattern or the like is printed on the surface of the WPB 11. Is formed by bonding. As described above, various so-called decorative materials such as the decorative sheet 12 can be applied to the so-called decorative material of the wooden substrate 3 in addition to the veneer 9 shown in FIGS.

  Note that the decorative groove 7 formed in the wooden base material 3 includes the veneer 9 (the decorative sheet 12 in the case of the wooden base material 3 shown in FIG. 3C), as shown in FIG. It is formed on the surface portion of the wooden substrate 3.

  Moreover, in the wooden board 1 of this embodiment, as shown in FIG. 2, the functional layer 4 is formed from three coating layers. The functional layer 4 includes an undercoat layer 13 formed on the surface of the veneer 9 that forms the surface of the wooden substrate 3, an intermediate coat layer 14 formed on the surface of the undercoat layer 13, and an intermediate coat layer. 14 is formed from three coating layers of an overcoat layer 16 that forms the outermost surface layer 15 of the functional layer 4. Each of the layers 13, 14, and 16 is formed as a coating film by applying a paint.

  The topcoat layer 16 that forms the outermost surface layer 15 is a layer that contains an antiallergen agent in order for the wood board 1 to exhibit antiallergenicity. The anti-allergen agent is mixed in a curable resin composition, which will be described later, constituting the paint, and is present in a coating film formed by coating, and exhibits anti-allergenic properties in the outermost surface layer 15.

  The thickness of the outermost surface layer 15 is preferably 5 to 20 μm. If the thickness of the outermost surface layer 15 is smaller than 5 μm, the formation of the coating film becomes unstable, the coating film strength becomes insufficient, and the antiallergenicity may not be fully exhibited. In particular, when an ultraviolet curable coating is used, the coating film may not be cured sufficiently because of oxygen inhibition. On the other hand, if the thickness of the outermost surface layer 15 is larger than 20 μm, the anti-allergen agent contained in the paint does not participate in the curing reaction, so the influence on the formation of the coating film is increased even with the same content, In some cases, physical properties such as coating film hardness cannot be sufficiently exhibited.

  The intermediate coating layer 14 is a layer including a thick film layer 17 that is formed immediately below the outermost surface layer 15 in the functional layer 4 and improves the scratch resistance of the top coating layer 16. The thick film layer 17 is formed in a thick film shape having a thickness of 50 to 100 μm, and is not formed of a plurality of layers of two or more layers, but is formed as a single layer by a single curing process of the paint. As a method for forming such a single layer, it is exemplified that the coating is formed by a curing treatment by supplying active energy or heating after the coating is applied once, and the active energy is applied after the first coating. For example, the coating material may be repeatedly applied without being supplied or heated, and then the first coating material and the repeatedly applied coating material may be combined and cured.

  And in the manufacturing method of the wood board which has the antiallergenic property of this invention, the thick film layer 17 forms the one part or all part by apply | coating the coating material comprised from a curable resin composition with a flow coater. Along with the application by the flow coater, the paint for forming the thick film layer 17 is accumulated in the decorative groove 7 formed on the surface portion of the wooden substrate 3, and is shown in FIGS. 1 (a), (b) and FIG. Such a paint reservoir 18 is formed. The paint reservoir 18 forms a filling layer 19 of a curable resin composition after being cured. In the case of the above-mentioned overcoating, the overcoating can be performed with a flow coater, and the first application can be performed with a roll coater. A coating film formed with a roll coater is preferred because adhesion to the lower layer tends to be better than a coating film formed with a flow coater.

  2 illustrates that the intermediate coating layer 14 is composed only of the thick film layer 17, but actually, not only the thick film layer 17 but also a wooden board as will be described later. In consideration of various functions required for one, one or more layers can be formed below the thick film layer 17.

  The undercoat layer 13 is a layer formed as an undercoat paint for the purpose of coloring paint for makeup, improving the adhesion of the functional layer 4 to the wood base material 3 as a base, and suppressing cracks. The undercoat layer 13 can be formed of a single layer or a plurality of layers of two or more layers. In the case of forming with a plurality of layers, for example, another layer that exerts the function as described above can be laminated on the colored layer. Such an undercoat layer 13 is generally formed by applying a paint to the surface of the wooden substrate 3 (such as the surface of the veneer 9) by a roll coater. In the case of painting by a roll coater, the paint for forming the undercoat layer 13 rarely enters the decorative groove 7 formed on the surface portion of the wooden substrate 3.

  Specifically, the anti-allergen agent contained in the topcoat layer 16 that forms the outermost surface layer 15 has a polar site that suppresses allergen substances in its chemical structure. Examples of such anti-allergen agents include water-insoluble polymers having a phenolic hydroxyl group. The water-insoluble polymer having a phenolic hydroxyl group adsorbs and captures the allergen substance by the phenolic hydroxyl group, and inactivates (suppresses) the energy activity of the allergen substance. Moreover, since it is a water-insoluble polymer, it can prevent bleeding and dissolution in the presence of water and high humidity conditions.

  Examples of the water-insoluble polymer having a phenolic hydroxyl group include polyvinylphenol such as poly (3,4,5-hydroxybenzoic acid vinyl) and poly (4-vinylphenol), polytyrosine, and poly (1-vinyl- 5-hydroxynaphthalene), poly (1-vinyl-6-hydroxynaphthalene), poly (1-vinyl-5-hydroxyanthracene) and the like. These may be used alone or in combination of two or more. Among them, polyvinylphenol is preferably used because it is a monophenol, has a low coloring level, does not impair the appearance of the substrate, has high workability, and is easily available as a commercial product.

  In addition, as the anti-allergen agent, an anionic surfactant, a compound or polymer having a hydroxyl group, a metal salt, or the like can be supported on an inorganic carrier.

  Examples of the anionic surfactant as an antiallergen include sodium benzenesulfonate, disodium lauryl diphenyl ether sulfonate, sodium dodecylbenzenesulfonate, sodium lauryl sulfate, sodium polyoxylene lauryl ether sulfate, hexadecylpyridinium chloride, odor Hexadecylpyridinium bromide, octadecylpyridinium bromide, dodecylpicolinium bromide, dodecylpyridinium chloride, benzylpyridinium chloride, butylpyridinium chloride, ammonium salts, amines such as triethanolamine and octadecyltrimethylamine, and amine salts. These may be used alone or in combination of two or more.

  Examples of the compound or polymer having a hydroxyl group as an antiallergen include gallic acid, polyvinyl alcohol, poly (4-vinylphenol), polytyrosine, lignophenol derivatives, cellulose, starch, hydroxyethylcellulose, methylcellulose, ethylcellulose, hydroxy Examples include propylcellulose, inulin, chitosan, cluster dextrin, guar gum, tannic acid, catechin, chitin, chitosan, plant extract and the like. These may be used alone or in combination of two or more.

  Examples of the metal salt as the antiallergen include sulfates, acetates and phosphates of divalent and tetravalent metals such as copper, zinc, zirconium, tin, lead and aluminum, and lithium, sodium, potassium and rubidium. , Alkali metal carbonates such as cesium and francium, and double salts containing these, for example, zinc sulfate, alum, lead acetate and the like can be used. These may be used alone or in combination of two or more.

  As the above-mentioned anionic surfactant, anti-allergen agent, compound or polymer having a hydroxyl group, and metal salt, the coloring level is low, the appearance of the substrate is not impaired, and it is commercially available and easily available. Those with high safety are preferably used. These anti-allergen agents are supported on an inorganic carrier and used as inorganic particles.

  As the inorganic carrier, conventionally known inorganic carriers can be used without particular limitation, and those having a large surface area are usually preferred. Specifically, inorganic oxides, that is, oxides such as Al, La, Ce, Si, Ti, Zr, Th, V, Nb, Ta, and Cr, or a combination of two or more of these, for example, silica , Silica gel, silica alumina, silica magnesia, silica titania, alumina titania, hydroxyapatite, zeolite, zirconium phosphate, porous ceramics, etc. or clay minerals such as montmorillonite and kaolin, and natural products such as diatomaceous earth You can also. Among them, those which are physically and chemically stable for a long time are preferable, and silica, silica gel, zirconium phosphate and the like are particularly preferable.

  As the inorganic carrier, those obtained by carrying silver ions or copper ions on the inorganic carrier as exemplified above are preferably used.

  There is no particular limitation on the method for supporting the anti-allergen agent on the inorganic carrier, and for example, a conventionally known method can be used. For example, an inorganic carrier molded into powder or pellets is impregnated with an aqueous solution of a desired antiallergen agent, excess water is removed by filtration or evaporation, dried, and then fired as necessary. An anti-allergen agent can be carried on the carrier. Alternatively, the anti-allergen agent can be supported on the inorganic carrier by adding an aqueous solution of a desired anti-allergen agent to the hydrosol or slurry of the inorganic carrier, kneading, drying, and firing as necessary.

  The amount of the anti-allergen agent supported on the inorganic carrier is not particularly limited and varies depending on the type of inorganic carrier or anti-allergen agent. However, if too much, the long-term stability of the inorganic carrier will not be exhibited, and if too little, the anti-allergen agent The performance of is not demonstrated. The loading amount of the anti-allergen agent on the inorganic carrier is usually 0.1 to 80% by mass, preferably 1 to 60% by mass with respect to the inorganic carrier.

  The content of the anti-allergen agent was any anti-allergen agent such as a water-insoluble polymer having a phenolic hydroxyl group exemplified above, an anionic surfactant, a compound or polymer having a hydroxyl group, and a metal salt. Even in the case, it is preferably 5 to 50% by mass, more preferably 10 to 30% by mass, based on the total amount of the curable resin composition. If the content is too small, the antiallergenicity may not be sufficiently exhibited. On the other hand, when there is too much the said content, durability of a coating film may become inadequate.

  As the curable resin composition constituting the coating that can be used for forming the topcoat layer 16 that is the outermost surface layer 15, the intermediate coating layer 14 including the thick film layer 17, and the undercoat layer 13, the coating film durability is It is preferable that it is crosslinkable from the point. Examples thereof include a thermosetting resin composition and an active energy curable resin composition. Specifically, examples of the thermosetting resin include polyester resin, urethane resin, melamine resin, epoxy resin, and silicone resin. Examples of the active energy curable resin include an ultraviolet curable resin and an ionizing radiation curable resin.

  Among such curable resin compositions, the active energy curable resin composition cures in a short time and is easy to form a layer. It is illustrated as a thing.

  A variety of active energy curable resin compositions including conventionally known ones are candidates, and contain at least one kind of so-called reactive oligomer or reactive monomer, and a polymerization initiator or solvent as necessary. Etc. are added.

  The reactive oligomer is effective for improving the coating strength such as stain resistance and scratch resistance of the curable resin composition, and is a light having two or more acryloyl groups or methacryloyl groups in one molecule. It is a resin obtained by polymerizing a curable (meth) acrylate monomer. For example, urethane (meth) acrylate, polyester (meth) acrylate, polyether (meth) acrylate, epoxy (meth) acrylate, polybutadiene (meth) acrylate, silicone (meth) acrylate, acryloyl on the side chain of acrylate copolymer And a copolymer (meth) acrylate having a group or a methacryloyl group introduced therein. Also included are units derived from fluorine-containing olefins, units derived from polymerizable unsaturated group-containing silicones, and copolymers containing units derived from hydroxyl-containing unsaturated ethers. These are used alone or in combination of two or more. Preferably, urethane acrylate having 3 or more acryloyl groups in one molecule or ester-modified epoxy acrylate is used.

  The compounding quantity of such a reactive oligomer can be 10-70 mass% with respect to 100 mass% of the whole curable resin composition, for example, Preferably it can be 20-50 mass%. . When the blending amount is less than 10% by mass, the coating strength of the curable resin composition having antiallergenic properties may not be sufficient, and when it exceeds 70% by mass, the coating becomes too hard and brittle. There is a case.

  The reactive monomer is used alone or in combination of two or more as a reactive diluent or a crosslinking agent. For example, acrylic acid, methacrylic acid, acryloylmorpholine, N-vinylformaldehyde, 2-ethylhexyl acrylate, lauryl acrylate, isobornyl acrylate, 3-methoxydibutyl acrylate, ethyl carbitol acrylate, methoxytripropylene glycol acrylate, phenoxyethyl acrylate , Phenoxy polyethylene glycol acrylate, 2-ethylhexyl acrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, hydroxypivalate neopentyl glycol acrylate, 2 (2-ethoxyethoxy) Ethyl acrylate, tetrahydrofurfuryl acrylate, 2-phenoxyethyl acrylate Relate, diethylene glycol diacrylate, tetraethylene glycol diacrylate, 1,3-butylene glycol diacrylate, tripropylene glycol diacrylate, 1,9-nonanediol diacrylate, 1,10-decanediol diacrylate, tricyclodecane dimethanol Diacrylate, glycerin triacrylate, trimethylolpropane triacrylate, pentaerythritol tetraacrylate, pentaerythritol triacrylate, ditrimethylolpropane tetraacrylate, dipentaerythritol hexaacrylate, dipentaerythritol penta (hexa) acrylate, methoxypolyethylene glycol # 400 acrylate Isocyanuric acid ethylene oxide modified di Acrylate, tris (acryloyloxyethyl) include various monomers such as isocyanurates.

  Moreover, the aliphatic hydrocarbon monomer which has 1-2 (meth) acryloyl groups can implement | achieve the low viscosity of a coating material, without reducing antiallergenicity.

  In general, an inorganic compound carrying an anti-allergen agent has a functional group having a high hydrogen bonding ability, and therefore interacts with a polymer having a carbonyl group or an ether group. However, when a mutual force due to hydrogen bonding acts between a polymer and a functional group having a high hydrogen bonding ability, which is an active site that inactivates an allergen substance, anti-allergenic properties may not be sufficiently exerted. Therefore, when using an inorganic compound carrying an anti-allergen agent, the above-mentioned aliphatic hydrocarbon monomer that can disperse this inorganic compound is used to reduce the viscosity of the paint while suppressing the decrease in anti-allergenicity. In addition, the application by the flow coater can be performed smoothly.

  Examples of such aliphatic hydrocarbon monomers include 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, 1,9-nonanediol diacrylate, 1,10- Examples include various monomers such as decanediol diacrylate. These are used alone or in combination of two or more. The compounding quantity of a reactive monomer can be 3-45 mass% with respect to the resin solid content of a curable resin composition, Preferably, it can be 5-40 mass%.

  As the polymerization initiator added to the curable resin composition as necessary, various types including conventionally known ones are candidates, and hydrogen abstraction type or intramolecular cleavage type can be used. Examples of the hydrogen abstraction type include benzophenone / amine system, Michler's ketone / benzophen system, and thioxanthone / amine system. Examples of the intramolecular cleavage type include benzoin type, acetophenone type, benzophenone type, thioxanthone type, and acylphosphine oxide type. Among them, acetophenone type 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1- [4- (2-Hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one, phenylglyoxylic acid methyl ester, acylphosphine oxide-type monoester whose absorption edge extends to a long wavelength Acyl phosphine oxide or bisacyl phosphine oxide is preferable.

  The compounding quantity of such a polymerization initiator can be 1-10 mass% with respect to the resin solid content of a curable resin composition, Preferably, it can be 3-6 mass%.

  In addition, various additives can be added to the curable resin composition as long as a coating film can be formed as the top coat layer 16 and the intermediate coat layer 14 shown in FIG. Examples of such additives include waxes, antibacterial agents, antifungal agents, non-reactive diluents, polymerization inhibitors, matting agents, antifoaming agents, antisettling agents, leveling agents, dispersing agents, heat stabilizers, Examples include ultraviolet absorbers.

  Furthermore, the curable resin composition can also contain an organic solvent. Examples of the organic solvent that can be contained include alcohols, ketones, esters, and amines. Among these, solvents having high electron donating properties such as alcohols, ketones, and esters are exemplified as preferable because they are more easily dissolved.

  As described above, as shown in the embodiment, the wood board 1 having anti-allergenicity of the present invention is the outermost surface layer 15 containing an anti-allergen agent in the functional layer 4 disposed on the surface of the wood base 3. Since the single-layer thick film layer 17 having a thickness of 50 to 100 μm is formed directly under the (overcoat layer 16), the outermost surface layer 15 is hardly damaged by the thick film layer 17, and retains aesthetic appearance. Is possible. It is not necessary to apply wax to the outermost surface layer 15. Therefore, the wood board 1 having antiallergenicity can continuously exhibit the antiallergenicity for a long period of time.

  Further, in the wood board 1 having antiallergenicity of the present invention, the thick film layer 17 is formed relatively easily because the thick film layer 17 is formed as a paint film made of a curable resin composition. And is dense and has good durability.

  Furthermore, in the wood board 1 having anti-allergenicity of the present invention, the curable resin composition is an active energy curable resin composition, so that a coating film can be easily formed in a short time, and the thick film layer 17 can be formed. It becomes easier.

  Furthermore, in the wood board 1 having the anti-allergenicity of the present invention, since the paint is accumulated in the decorative groove 7 formed on the surface portion of the wood base material 3, the filling layer 19 made of the curable resin composition is formed. , Accumulation of allergen substances in the decorative groove 7 is suppressed. A decrease in antiallergenicity associated with the formation of the decorative groove 7 can be suppressed, and can be easily realized.

  On the other hand, in the manufacturing method of the wood board 1 having antiallergenicity of the present invention, the thick film layer 17 is formed by applying a paint composed of a curable resin composition with a flow coater. It is easily formed into a thick film having a thickness of 50 to 100 μm. In addition, since the thick film layer 17 is formed as a single layer, there is no fear of delamination in the case of a multilayer structure, and a thick film layer with good quality is obtained, and the outermost surface layer 15 has sufficient durability. Can be secured. Further, the surface of the thick film layer 17 is formed with unevenness that does not hinder the appearance, and even if the outermost surface layer 15 is scratched, the scratch is not noticeable. The surface becomes less slippery and less sticky.

  Moreover, in the manufacturing method of the wood board 1 which has the antiallergenic property of this invention, a coating film can be formed easily in a short time and formation of the thick film layer 17 can be made easy.

  Furthermore, in the manufacturing method of the wood board 1 which has the antiallergenic property of this invention, it can suppress that an allergen substance accumulates in the decorative groove | channel 7. FIG. A decrease in antiallergenicity associated with the formation of the decorative groove 7 can be suppressed, and can be easily realized.

  In the wood board having antiallergenicity and the method for producing the same according to the present invention, the functional layer is not necessarily constituted only by the coating film, and a part thereof exhibits a similar function such as a resin sheet. It can also be replaced with other things. As long as the intended function is exhibited in the functional layer, various configurations of the functional layer can be considered. On the other hand, in the functional layer, as described above, the thick film layer is formed immediately below the outermost surface layer containing the anti-allergen agent and is a single layer having a thickness of 50 to 100 μm.

  Examples of the wood board having antiallergenicity and the method for producing the same according to the present invention will be described below. It is clear from the above description that the present invention is not limited to the following examples.

(Example 1)
According to the following processes 1-5, the floor material which is a wooden board was produced.
[1] A laminar plywood with a thickness of 11.8 mm was bonded to a single plate of 0.2 mm thick beach material, V-groove processing was performed to form a decorative groove, and a wooden substrate for floors was produced.
[2] After applying an aqueous colorant to the woody substrate produced in the above step 1, it was dried at 80 ° C. for 1 minute, and then an ultraviolet curable urethane acrylate primer was applied with a sponge roll. After scraping the paint with a metal reverse rotating roll to adjust the total coating amount to 2 g / scale ² (21.8 g / m ² ), further applying the same paint at 1 g / scale ² using a rubber roll, An undercoat layer was formed by curing by irradiating with ultraviolet rays at an integrated illuminance of 100 mJ / cm ² .
[3] After the above step 2, as the first intermediate coating, an ultraviolet curable urethane acrylate intermediate coating containing 30 parts of white alumina as an anti-friction material was passed through a rubber roll twice to total 2 g / After applying with a scale ² and curing by irradiating ultraviolet rays with an integrated illuminance of 200 mJ / cm ² , the surface was polished with # 320 sandpaper.
[4] After the above step 3, as a second intermediate coating, an ultraviolet curable urethane acrylate intermediate coating was applied at a total of 2 g / scale ² using a sponge roll and a rubber roll. Then, as the third intermediate coating, the same UV curable urethane acrylate intermediate coating as the coating used for the ^second intermediate coating was applied at 7 g / scale ² using a flow coater. Thereafter, the film was cured by irradiating with ultraviolet rays at an integrated illuminance of 100 mJ / cm ² to form an intermediate coating layer together with the thick film layer.

During the third intermediate coating, paint was accumulated in the decorative groove formed on the surface portion of the wooden substrate, and a cured layer was formed after curing.
[5] After the above step 4, an ultraviolet curable urethane acrylate top coating composition containing 10% of a polyvinylphenol-based antiallergen is applied at 1 g / scale ² using a rubber roll, and an integrated illuminance of 350 mJ / cm ^{In step 2} , ultraviolet rays were irradiated and cured to form an overcoat layer as the outermost surface layer.

In this way, a flooring material having substantially the same structure as that of the wood board 1 shown in FIG. 2 is produced, and the coating film is formed by the second and third intermediate coatings for forming a thick film layer on the flooring material. The thickness was 90 μm. The film thickness of the outermost surface layer was 10 μm.
(Example 2)
In the second intermediate coating in Step 4 of Example 1, a flooring material was produced in the same manner as in Example 1 except that the total application amount of the intermediate coating applied by the sponge roll and rubber roll was 3 g / scale ^2. did.

The film thickness of the coating film formed by the second and third intermediate coatings for forming the thick film layer of the produced flooring was 100 μm. The film thickness of the outermost surface layer was 10 μm.
(Example 3)
A flooring was produced in the same manner as in Example 1 except that the amount of the intermediate coating applied by the flow coater was changed to 5 g / scale ² in the third intermediate coating in Step 3 of Example 1.

The film thickness of the coating film formed by the second and third intermediate coatings for forming the thick film layer of the produced flooring was 70 μm. The film thickness of the outermost surface layer was 10 μm.
Example 4
A flooring was produced in the same manner as in Example 1 except that the intermediate coating was replaced with an ultraviolet curable epoxy acrylate coating in the second and third intermediate coatings in Step 4 of Example 1. A flooring having substantially the same structure as that of the wood board 1 shown in FIG. 2 was produced, and the film thickness of the coating film by the second and third intermediate coatings forming a thick film layer on this flooring was 90 μm. It was. The film thickness of the outermost surface layer was 10 μm.
(Comparative Example 1)
In Example 1, a flooring was prepared by omitting the second and third intermediate coatings in Step 4. The overcoat layer was formed on an intermediate coat layer having a thickness of 20 μm without a thick film layer, and almost no coating film was formed on the decorative groove.
(Comparative Example 2)
While Example 1 and Steps 1 to 3 are common, in Step 4, the UV curable urethane acrylate intermediate coating is applied for the third intermediate coating using a flow coater and the subsequent UV irradiation. Only the second intermediate coating using a sponge roll and a rubber roll was performed.

Also, in Step 5, after applying an ultraviolet curable urethane acrylate top coating composition containing 10% of a polyvinylphenol anti-allergen agent at 7 g / scale ² using a flow coater instead of a rubber roll, integrated illuminance The outermost surface layer was formed by irradiating with ultraviolet rays at 350 mJ / cm ² and curing together with the coating film by the second intermediate coating. The same type of coating, the top coating was applied without curing after the intermediate coating, and the coating film was cured, so the intermediate coating layer by the second intermediate coating was the outermost surface of a single layer along with the top coating layer. Form a layer. The film thickness of the outermost surface layer was 90 μm.

  FIG. 4 is a cross-sectional view of the main part showing the decorative groove of the floor material (wood board) and the periphery thereof. In FIG. 4, parts that are the same as those shown in FIG.

The film thickness of the coating film formed immediately below the outermost surface layer 15 containing the anti-allergen agent formed in the functional layer 4 was 20 μm. A thick film layer is not formed on this coating film. Further, a paint reservoir 18 for forming the top coat layer 16 was formed in the decorative groove 7, and a cured layer 20 was formed.
(Comparative Example 3)
In Step 4 of Example 1, as the second intermediate coating, a rubber roll was passed twice to apply the intermediate coating with a total of 3 g / scale ² , and cured by irradiating with ultraviolet rays at an integrated illuminance of 200 mJ / cm ² . Further, a flooring was produced in the same manner as in Example 1 except that the third intermediate coating was omitted.

  Table 7 summarizes the manufacturing process of the above seven types of flooring materials. Moreover, about the produced seven flooring materials, the economical efficiency about external appearance, damage resistance, and formation of a functional layer was compared and evaluated. The scratch resistance was evaluated by measuring the hardness of the outermost surface layer according to a standard method specified in JIS K5400. The results are as shown in Table 2.

  As shown in Table 2, the flooring materials of Examples 1 to 4 have excellent pencil hardness of the outermost surface layer exhibiting antiallergenicity as “5H” and are excellent enough to eliminate the need for wax application, In addition, the appearance and economy were sufficiently satisfactory.

  On the other hand, since the thick film layer was not formed in the functional layer, the pencil hardness of the outermost surface layer of the floor material of Comparative Example 1 was as low as “H”.

  The flooring material of Comparative Example 2 has a pencil hardness of “3H” on the outermost surface layer, which is insufficient for the continuous exertion of antiallergenic properties, and the coating film has a yellowish red color. It became defective. The pencil hardness of the outermost surface layer was lowered and the scratch resistance was insufficient. The film thickness of the coating film forming the layer below the outermost surface layer is the thickness of the thick film layer specified in the present invention. This is because it is below the lower limit of 50 μm.

Further, in the flooring material of Comparative Example 2, the outermost surface layer is a thick film having a thickness of 90 μm, but the top coating applied by the flow coater contains 10% of an antiallergen agent that does not participate in curing. It is thought that the hardness of the coating film was lowered. If the film thickness is about 10 μm, the decrease in hardness is suppressed even if 10% of the anti-allergen agent is contained, but a thick film with a film thickness of about 70 μm corresponding to a coating amount of 7 g / scale ² Then, the influence of the film thickness on the hardness is large.

Furthermore, generally, when the anti-allergen is a water-insoluble polymer having a phenolic hydroxyl group, yellowish red is exhibited. When this anti-allergen agent-containing coating is applied using a flow coater, the coating amount increases to 7 g / scale ² compared to the time of roll coating, so it is considered that the coating film is yellowish red in the flooring material of Comparative Example 2. It is done.

  Furthermore, the economics of forming the functional layer is greatly reflected in the amount of the anti-allergen agent. That is, in the case of the flooring material of Comparative Example 2, since the paint containing the anti-allergen agent was applied using a flow coater, the application amount increased, and the total amount of the anti-allergen agent contained therein increased. The economy has declined.

  In the flooring material of Comparative Example 3, the pencil hardness of the outermost surface layer was “2H”, which was insufficient for the continuous display of antiallergenic properties. The pencil hardness of the outermost surface layer was lowered and the scratch resistance was insufficient, as in the flooring material of Comparative Example 1, the film thickness of the coating film forming the layer below the outermost surface layer was This is because it is less than 50 μm, which is the lower limit of the thickness of the thick film layer defined in the present invention.

DESCRIPTION OF SYMBOLS 1 Wood board 3 Wood base material 4 Functional layer 7 Makeup groove 15 Outermost surface layer 17 Thick film layer 19 Filling layer

Claims (7)

  A plate-like wood base material and a functional layer disposed on the surface of the wood base material and formed of a plurality of two or more layers, the outermost surface layer located on the outermost side of the functional layer being an antiallergen A thick wood layer having a thickness of 50 to 100 μm is formed immediately below the outermost surface layer in the functional layer. A wood board having antiallergenicity, characterized by being a layer.   2. The wood board having antiallergenic properties according to claim 1, wherein the thick film layer is formed as a coating film of a paint composed of a curable resin composition.   The wood board having antiallergenic properties according to claim 2, wherein the curable resin composition is an active energy curable resin composition.   The decorative groove is formed in the surface part of the said wooden base material, The said coating material accumulates in this decorative groove, The filling layer by the said curable resin composition is formed in Claim 2 or 3 characterized by the above-mentioned. The wood board which has the antiallergenicity of description.   It is a manufacturing method of the wood board which has anti-allergenic property of Claim 1, Comprising: Part or all of the said thick film layer is formed by apply | coating the coating material comprised from a curable resin composition with a flow coater. A method for producing a wooden board having antiallergenicity, characterized by the above.   The said curable resin composition is an active energy curable resin composition, The manufacturing method of the wood board which has anti-allergenic property of Claim 5 characterized by the above-mentioned.   The anti-allergenic property according to claim 5 or 6, wherein the coating material is accumulated in a decorative groove formed on a surface portion of the wooden substrate, and a filling layer of the curable resin composition is formed. A method for producing wood board.

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