JP7166313B2 - wooden veneer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a wooden decorative material having excellent surface discoloration prevention properties.

Since the color tone and wood grain pattern of wood give a sense of beauty and warmth, wood decorative materials that take advantage of the natural texture of wood are widely used as building materials for the exterior and interior of buildings. A resin coating film is provided on the surface of the wooden base material of such a wooden decorative material to prevent scratches.

By the way, when wood is exposed to sunlight for a long period of time, it generally darkens due to sunburn, and while it has a deeper and more natural texture, there is a difference in color from various other building materials placed around it. may occur. The resin coating film provided on the surface of such a wooden decorative material contains, for example, an additive that suppresses discoloration due to ultraviolet rays. In some cases, a decorative sheet is used in which a wood grain pattern is reproduced with a coloring agent by inkjet, gravure printing, or the like, and a transparent protective layer is provided on the surface of the decorative sheet. In this decorative sheet, the printing may be deteriorated by sunlight and the wood grain pattern may be discolored. Therefore, in some cases, an additive that suppresses the discoloration due to ultraviolet rays is included, as in the case where veneers are used.

For example, Patent Literature 1 discloses an exterior laminated veneer decorative board in which a transparent thermoplastic resin layer and a transparent surface protective coating layer are laminated in order on the surface of a veneer base material. An ultraviolet absorber and a light stabilizer are added to each resin of the resin layer. This suppresses discoloration of the veneer surface due to ultraviolet rays. Further, in the wood veneer disclosed in Patent Document 2, the intermediate layer among the layers provided on the wood veneer base material is formed by adding an ultraviolet absorber to resin.

JP 2006-110929 A Japanese Patent Publication No. 2018-528880

An ultraviolet absorber or the like having an anti-discoloration effect as used in Patent Documents 1 and 2 increases the effect of preventing discoloration of the veneer and deterioration of the decorative sheet as the amount added to the coating layer is increased. However, not only are these agents generally expensive, but especially when providing a surface coating layer having UV-curing properties, increasing the amount of the UV absorber added to the surface coating layer reduces the amount of added coating. Inhibition of curing occurs in the film layer itself, and there is a risk that the surface protective effects such as antifouling properties and water resistance expected of the surface coating layer, which are obtained when completely UV-cured, cannot be obtained. Similarly, when a UV-curable coating layer is provided adjacent to a coating layer with an increased amount of an ultraviolet absorber or the like added, the UV-curable coating layer bleeds out (bleeds out) from the UV absorbent or the like on the layer surface. and may cause curing inhibition for the UV cured coating layer.

Furthermore, as in the exterior laminate veneer decorative board of Patent Document 1 and the wood veneer of Patent Document 2, when the added ultraviolet absorber and light stabilizer are blended in the outermost coating layer, bleeding out Due to this, it becomes impossible to retain the natural texture inherent in wood on the surface of the base material of the wooden decorative material.

In addition, when using a product using a veneer or the like on the surface of a wooden base material for a long period of time, the user may feel inconvenience due to discoloration of the surface of the product. Therefore, by providing a colored layer in advance on the surface of the veneer or the like that makes the discoloration inconspicuous, the discoloration is made inconspicuous while maintaining the natural texture inherent in the wood.

In order to suppress discoloration of the colored layer itself, a pigment-based coloring agent is often used in such a colored layer. When such a pigment-based colorant is used, if a colored layer is provided to such an extent that the discoloration on the surface of the wooden base material becomes inconspicuous, the shade (wood grain) derived from the wood can be utilized as a natural texture. It loses its transparency. As a result, even if a colored layer is provided in order to prevent discoloration of the surface of the wooden base material, there is a problem that various changes inherent in the wood are suppressed.

The present invention has been made in view of this point, and its object is to suppress discoloration of the surface of the wooden base material over a relatively long period of time by improving the layer on the surface of the wooden decorative material. In addition, it is to provide a woody decorative material with a high design property.

In order to achieve the above object, in the present invention, a coating film layer having a discoloration-preventing coating film layer is provided on the surface of the base material of the wooden decorative material.

Specifically, the first invention is
a decorative material having a permeation prevention part that prevents permeation of paint from the surface;
A discoloration prevention coating layer formed on the surface of the decorative material;
A surface protective coating layer formed on the surface of the anti-tarnish coating layer,
The discoloration-preventing coating layer contains a discoloration-preventing resin having a functional group having an ultraviolet absorption function and a functional group having a radical scavenging function, and a cross-linking agent that crosslinks the discoloration-preventing resin ,
The cross-linking agent contained in the anti-tarnish coating layer is 10 parts by weight or more and 50 parts by weight or less with respect to 100 parts by weight of the anti-tarnish resin,
The surface protective coating layer is a wooden decorative material containing an acrylic resin and an ultraviolet photopolymerization initiator.

In the first invention, since the discoloration-preventing resin has an ultraviolet absorbing function, discoloration of the surface of the decorative material can be suppressed. Moreover, since the discoloration-preventing resin has a radical scavenging function, it can scavenge radicals generated in the discoloration-preventing coating layer. As a result, the ultraviolet absorption function can be ensured over a relatively long period of time.

In addition, instead of using a resin to which an ultraviolet absorber and a radical scavenger are added, a discoloration-preventing resin in which a functional group having an ultraviolet absorption function and a radical scavenger function is incorporated in the resin skeleton is used. Out can be suppressed.

In addition, since the decorative material has a permeation prevention portion, the resin paint of the discoloration-preventive coating layer is suppressed from permeating into the decorative material. As a result, the amount of the resin paint used can be suppressed, and the manufacturing cost of the wooden decorative material can be suppressed.

In addition, a coating layer including an anti-tarnish coating layer is formed on the surface of the decorative material by the coating. Therefore, it becomes more difficult to separate from the surface of the decorative material than when the resin sheet is adhered to the surface of the base material.

In addition, the cross-linking agent can increase the hardness of the anti-tarnish coating layer. Therefore, even if the surface of the wooden decorative material is damaged, the external exposure of the decorative material can be suppressed.

In addition, the cross-linking agent improves the adhesion between the discoloration-preventing coating layer and the permeation-preventing part, and between the discoloration-preventing coating layer and the surface protective coating layer.

In addition, since the surface protective coating layer is formed on the surface of the anti-discoloration coating layer, it is possible to prevent part of the anti-discoloration coating layer from being exposed to the outside even if the surface of the wooden decorative material is damaged. .

In addition, since the mixing ratio of the cross-linking agent to the discoloration-preventing resin is relatively high, the physical strength of the discoloration-preventing coating layer can be increased, and peeling of the discoloration-preventing coating layer can be suppressed. As a result, discoloration of the surface of the wooden decorative material can be suppressed for a long period of time. Also, the anti-tarnish coating layer can be made thin due to the high strength. As a result, the amount of discoloration-preventing resin used can be reduced, so that the manufacturing cost of the wooden decorative material can be reduced.

By the way, in the discoloration prevention coating layer to which the ultraviolet absorber is added as in the past, when a layer containing an ultraviolet curing agent is laminated on the surface of the discoloration prevention coating layer, the ultraviolet light is absorbed by the ultraviolet absorber added to the resin. Curing of the layer containing the curing agent may be inhibited.

In the first invention, as described above, the discoloration prevention coating layer uses a resin having a functional group having an ultraviolet absorbing function, so that the surface of the discoloration prevention coating layer has an ultraviolet curing effect. Even if a layer containing a resin is laminated, there is no possibility that curing will be inhibited by the ultraviolet absorber during ultraviolet irradiation. Therefore, according to the first invention, the surface protective coating layer can be cured relatively easily by irradiating with ultraviolet rays.

As described above, it is possible to suppress discoloration of the surface of the wooden decorative material over a relatively long period of time without impairing the natural texture inherent in the wood of the surface of the wooden decorative base material. Moreover, discoloration of the surface of the cosmetic material can be suppressed without providing a colored layer. As a result, it is possible to suppress the deterioration of the wood-derived transparency, thereby improving the design of the wooden decorative material.

The second invention is
a decorative material having a permeation prevention part that prevents permeation of paint from the surface;
A discoloration prevention coating layer formed on the surface of the decorative material;
A surface protective coating layer formed on the surface of the anti-tarnish coating layer,
The discoloration-preventing coating layer contains a discoloration-preventing resin having a functional group having an ultraviolet absorption function and a functional group having a radical scavenging function, and a cross-linking agent that crosslinks the discoloration-preventing resin,
The cross-linking agent contained in the anti-discoloration coating layer is 20% by weight or more and 50% by weight or less with respect to the anti-discoloration coating layer after curing,
The surface protective coating layer is a wooden decorative material containing an acrylic resin and an ultraviolet photopolymerization initiator.

In the second invention, the mixing ratio of the cross-linking agent in the anti-discoloration coating layer is relatively high, so that the strength of the anti-discoloration coating layer can be increased.

A third invention is the first or second invention,
The anti-discoloration coating layer is a wooden decorative material containing an ultraviolet absorber that absorbs ultraviolet rays with a wavelength of 350 nm or more.

It is possible to increase the amount of ultraviolet rays absorbed by the anti-tarnish resin, or to absorb ultraviolet rays in a wide wavelength range by selecting an ultraviolet absorbent that absorbs ultraviolet rays in a wavelength range different from that of the anti-tarnish resin. As a result, the anti-discoloration effect of the anti-discoloration coating layer can be increased.

A fourth invention is any one of the first to third inventions,
The anti-tarnish resin absorbs UV light up to 360 nm.

A fifth invention is any one of the first to fourth inventions,
The functional group having the radical scavenging function is a hindered amine group.

In the fifth invention, the functional group having a radical scavenging function can be a hindered amine group.

A sixth invention is any one of the first to fifth inventions,
The permeation prevention portion is at least one of a surface layer portion obtained by impregnating the decorative material with a resin and hardened, and an undercoat portion formed on the surface of the decorative material.

In the sixth invention, by filling the voids in the surface layer of the decorative material with the resin, it is possible to prevent the penetration of the resin paint of the anti-discoloration coating layer from the surface of the wooden substrate. In addition, by forming the undercoat on the surface of the decorative material, the resin filling the surface of the decorative material imparts a sense of transparency and prevents the resin paint of the discoloration-preventing coating layer from penetrating from the surface of the decorative material.

In addition, since the coated surface of the anti-tarnish coating layer with the resin coating can be made uniform, the thickness of the anti-tarnish coating layer can be made uniform and relatively thin.

A seventh invention is any one of the first to sixth inventions,
The anti-discoloration coating layer contains the anti-discoloration resin in an amount of 50% by weight or more and 80% by weight or less relative to the anti-discoloration coating layer after curing.

In the seventh aspect of the invention, since the compounding ratio of the anti-discoloration resin in the anti-discoloration coating layer is relatively high, the effect of preventing discoloration of the wooden decorative material can be increased.

An eighth invention is any one of the first to seventh inventions,
The anti-tarnish coating layer has a thickness of 0.3 μm or more and 10 μm or less.

In the eighth aspect, since the anti-tarnish coating layer is relatively thin, it is possible to reduce the amount of the composition that constitutes the anti-tarnish coating layer. Therefore, the manufacturing cost can be suppressed.

A ninth invention is that the decorative material of any one of the first to eighth inventions is a veneer.

In the ninth invention, the veneer provided with the permeation prevention portion can be provided with a discoloration prevention coating layer and a surface protection coating layer. As a result, even if the veneer is prone to discoloration, discoloration due to sunlight can be suppressed over a long period of time. Because the anti-penetration part is provided on the surface, even if the veneer is easily soaked with paint, etc., the anti-discoloration resin does not permeate, and the thin and uniform layer is effective so that it comes in contact with the anti-penetration layer on the surface of the veneer. An anti-tarnish coating layer can optionally be provided.

As described above, according to the present invention, discoloration of the surface of the wooden substrate can be suppressed for a relatively long period of time, and a decorative wooden material with a high design property can be provided.

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

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated based on drawing. The following description of preferred embodiments is merely exemplary in nature and is not intended to limit the invention, its applications or uses.

<<Embodiment>>
The wooden decorative material 1 is a building material used, for example, in the interior of a building. Specifically, the wooden decorative material 1 is a floor material such as flooring, a wall material, or the like. As shown in FIG. 1 , the wooden decorative material 1 includes a decorative material 60 , a discoloration prevention coating layer 40 and a surface protection coating layer 50 .

-Cosmetic material-
The decorative material 60 has a base material layer 10 and a veneer 20 . The base material layer 10 is made of, for example, MDF, plywood, LVL, LVS, particle board, or other wooden materials. Here, the material of the base material layer 10 is MDF.

The veneer 20 is provided on the surface 10 a of the base material layer 10 . The veneer 20 is a plate material obtained by slicing a laminate of natural wooden materials. Natural wood materials include, for example, hard tree species such as oak, birch, beech, and cherry, and soft tree species such as cedar, hemlock, cypress, and sawa walnut. Any kind of natural wood material such as conifers, hardwoods, and fast-growing trees can be used. Here, the veneer 20 material is oak. The thickness of the projecting plate 20 is preferably about 0.2 to 2.0 mm. The veneer 20 is adhered to the surface 10a of the base material layer 10 with an adhesive. As the adhesive, for example, one containing urea melamine resin is used.

The decorative material 60 has a permeation prevention portion 70 . The permeation prevention portion 70 is composed of the surface layer portion 20 b of the projecting plate 20 and the undercoat portion 30 formed on the surface 20 a of the projecting plate 20 . As shown in the enlarged view of FIG. 1, the surface layer portion 20b is impregnated with resin over the entire surface of the projecting plate 20 so as to fill the gaps of the projecting plate 20. As shown in FIG. The resin is, for example, acrylic resin. Examples of acrylic resins include oligomers and monomers such as polyester acrylates, epoxy acrylates, urethane acrylates, and polyether acrylates, or mixtures thereof.

The undercoat portion 30 is formed over the entire surface 20a of the veneer 20 . The undercoat portion 30 is formed by applying a resin paint from above the resin-impregnated surface layer portion (20b). The undercoat 30 is a colorless and transparent resin layer. The surface of the undercoat portion 30 is formed flush. The resin forming the undercoat portion 30 is, for example, an acrylic resin. Examples of acrylic resins include oligomers and monomers such as polyester acrylates, epoxy acrylates, urethane acrylates, and polyether acrylates, or mixtures thereof. The resin of the undercoat portion 30 may be the same as the resin of the surface layer portion 20b. The undercoat portion 30 may be formed of a plurality of layers by coating the acrylic resins of the same type or different types. The thickness of the undercoat portion 30 is preferably about 5 to 270 μm, more preferably about 20 to 180 μm. The resin filled in the surface 20a of the decorative material 60 imparts a sense of transparency, and the design of the wooden decorative material 1 can be improved.

-Discoloration prevention coating layer-
The anti-tarnish coating layer 40 is formed on the surface of the decorative material 60 . Specifically, the anti-tarnish coating layer 40 is formed on the surface 30 a of the undercoat portion 30 . The discoloration prevention coating film layer 40 is a colorless and transparent resin layer. The anti-tarnish coating layer 40 is formed with a uniform thickness. The thickness of the anti-tarnish coating layer 40 is about 0.5 to 10 μm, preferably about 1.0 to 6.0 μm. The anti-tarnish coating layer 40 contains an anti-tarnish resin, a cross-linking agent, and an ultraviolet absorber.

The discoloration-preventing resin has a functional group having an ultraviolet absorbing function and a functional group having a radical scavenging function. The anti-tarnish resin is a resin in which these functional groups are incorporated into the skeleton of the acrylic resin. For the anti-tarnish resin, for example, "Hals Hybrid UV-G" series (registered trademark of Nippon Shokubai Co., Ltd.) is used. The anti-tarnish resin particularly absorbs ultraviolet light with wavelengths up to 360 nm. The discoloration prevention resin is contained in an amount of 50% by weight or more and 80% by weight or less, preferably 60% by weight or more and 75% by weight or less with respect to the discoloration prevention coating film layer 40 after curing. In addition, the anti-tarnish resin absorbs ultraviolet rays (wavelength: 280 to 400 nm) that reach the earth's surface from the sun. A functional group having a radical scavenging function is exemplified by a hindered phenol group, and preferably a hindered amine group is selected. Benzophenone-based, benzotriazole-based, and triazine-based functional groups are exemplified as functional groups having an ultraviolet absorption function, and hydroxyphenyltriazine-based groups are preferably selected.

The cross-linking agent may be anything as long as it cures the anti-discoloration resin. For example, an isocyanate-based cross-linking agent is used. Examples of isocyanate-based cross-linking agents include tolylene diisocyanate (TDI), xylylene diisocyanate (XDI), hexamethylene diisocyanate (HDI), meta-diisocyanate (MDI), lysine diisocyanate (LDI), isophorone diisocyanate (IPDI), methylhexane diisocyanate ( HTDI), methylcyclohexanone diisocyanate (HXDI), and trimethylhexamethylene diisocyanate (TMDI). Hexamethylene diisocyanate (HDI) is preferably used as a cross-linking agent with high weather resistance.

The cross-linking agent is blended in a proportion of 10 to 50 parts by weight, preferably 15 to 45 parts by weight, with respect to 100 parts by weight of the anti-tarnish resin. Moreover, the cross-linking agent is contained in an amount of 20% by weight or more and 50% by weight or less, preferably 30% by weight or more and 45% by weight or less with respect to the discoloration prevention coating film layer 40 after curing.

The ultraviolet absorber may be one that absorbs ultraviolet rays (wavelength: 280 to 400 nm) reaching the earth's surface from the sun. UV absorbers that absorb at high wavelengths (350 nm and above) are preferably used. Examples thereof include benzotriazole-based UV absorbers, benzophenone-based UV absorbers, and triazine-based UV absorbers. The ultraviolet absorber absorbs ultraviolet light in a wavelength range different from the wavelength range of ultraviolet light that can be absorbed by the anti-tarnish resin. The ultraviolet absorber may particularly absorb ultraviolet light in a wavelength range different from the wavelength range in which the discoloration prevention resin has a high ultraviolet absorption effect. It may overlap with the area. Also, two or more types of ultraviolet absorbers may be used in combination. In this case, a plurality of ultraviolet absorbers having different absorption effects depending on the wavelength range of ultraviolet rays may be used. Here, for example, products “Tinuvin477” and “Tinuvin479” (Tinuvin is a registered trademark) of BASF Japan Ltd. are used. "Tinuvin 477" and "Tinuvin 479" especially absorb ultraviolet light with wavelengths of 350 nm and above. The thickness of the anti-tarnish coating layer 40 after curing is 3 μm to 10 μm. The ultraviolet absorber is contained in an amount of 5 parts by weight or more and 20 parts by weight or less, preferably 5 parts by weight or more and 15 parts by weight or less with respect to 100 parts by weight of the anti-tarnish resin. Due to these contents, the ultraviolet absorber can partially bond with the cross-linking agent, suppress bleed-out, cover the absorbable wavelength region, and most preferably absorb ultraviolet rays.

- Surface protective coating layer -
The surface protective coating layer 50 is a layer that protects the surface of the decorative material 60 . The surface protective coating layer 50 is formed on the surface of the anti-tarnish coating layer 40 . The surface protective coating layer 50 is colorless and transparent. The surface protective coating layer 50 is formed with a uniform thickness. The thickness of the surface protective coating layer 50 is 30 μm or more and 150 μm or less, preferably 40 μm or more and 70 μm or less.

The surface protective coating film layer 50 contains a resin having an ultraviolet curing effect. Specifically, the surface protection coating film layer 50 has an acrylic resin and an ultraviolet photopolymerization initiator. Examples of acrylic resins include oligomers and polymers such as polyester acrylates, epoxy acrylates, urethane acrylates, and polyether acrylates, or mixtures thereof. When the ultraviolet photopolymerization initiator is irradiated with ultraviolet rays having a wavelength of, for example, 300 to 400 nm, the ultraviolet photopolymerization initiator starts cleavage and cures the coating film. In addition, the surface protective coating film layer 50 may contain an ultraviolet absorber in such an amount that curing is not inhibited.

<<Manufacturing method of wooden decorative material>>
Next, a method for manufacturing the wooden decorative material 1 will be described.

<Formation of decorative material>
The decorative material 60 is formed by bonding the veneer 20 to the surface 10 a of the base layer 10 .

<Formation of permeation prevention part>
The permeation prevention portion 70 is formed by subjecting the surface layer portion 20b of the veneer 20 to WPC (Wood Plastic Combination) treatment, and then providing the undercoat portion 30 on the surface 20a of the veneer 20 . Specifically, by the WPC treatment, the entire surface layer portion 20b of the veneer 20 is impregnated with resin and hardened. This treatment can prevent the resin paint of the undercoat portion 30 applied to the surface 20 a of the veneer 20 from penetrating into the veneer 20 . This WPC treatment imparts a sense of transparency to the surface of the veneer 20, realizing excellent design.

Next, the undercoat portion 30 is formed on the surface 20 a of the veneer 20 . The undercoat 30 is formed by coating the surface 20a of the veneer 20 with an acrylic resin-based paint, which is the material of the undercoat 30, with a roll coater. A sponge coater, a spray, a brush, or the like may be used instead of the roll coater.

<Formation of anti-discoloration coating layer>
An anti-tarnish coating layer 40 is formed on the surface 30 a of the cured undercoat 30 . The discoloration prevention coating layer 40 uses a discoloration prevention resin, a cross-linking agent, and two types of ultraviolet absorbers. These materials are blended in a predetermined ratio and dissolved in thinner. After that, this solution is applied to the surface 30a of the undercoating portion 30 and dried. As a result, the discoloration prevention coating layer 40 is formed. For example, a roll coater, a sponge coater, a spray, a brush, or the like can be used to apply the solution. After application, the anti-tarnish coating layer 40 is cured by drying.

<Formation of surface protective coating layer>
A surface protective coating layer 50 is formed on the surface 40 a of the hardened anti-tarnish coating layer 40 . As the surface protective coating film layer 50, a resin coating of acrylic resin containing a predetermined amount of ultraviolet curing initiator is used. After applying this resin paint to the surface 40a of the anti-tarnish coating layer 40, it is cured by irradiation with a high-pressure mercury lamp. For this coating, for example, a roll coater, a sponge coater, a spray, a brush, or the like can be used. This process is repeated multiple times (eg, four times) to form a plurality of layers (eg, four layers) of the surface protective coating layer 50 .

- Effects of the embodiment -
The wooden decorative material 1 according to the present embodiment configured as described above includes the decorative material 60 having the permeation prevention portion 70 for preventing the penetration of the paint from the surface, and the discoloration prevention portion formed on the surface of the decorative material 60. It comprises a coating layer 40 and a surface protection coating layer 50 formed on the surface of the anti-discoloration coating layer 40 . The discoloration prevention coating layer 40 includes a discoloration prevention resin having a functional group having an ultraviolet absorption function and a radical scavenging function, and a discoloration prevention coating layer 40 containing a cross-linking agent for cross-linking the discoloration prevention resin. included.

Since the discoloration prevention resin of the discoloration prevention coating film layer 40 has an ultraviolet absorption function, discoloration of the surface 20a of the veneer 20, which is the surface of the decorative material 60, can be suppressed. Moreover, since the anti-discoloration resin has a radical scavenging function, it scavenges radicals generated in the anti-discoloration coating layer 40 . As a result, deterioration of the ultraviolet absorption function can be suppressed over a relatively long period of time, and discoloration of the anti-discoloration coating layer 40 can also be suppressed. As a result, discoloration of the surface 20a of the veneer 20 can be suppressed over a relatively long period of time without impairing the natural texture of the veneer 20.

In addition, the discoloration-preventing resin of the discoloration-preventing coating layer 40 is not a resin to which an ultraviolet absorber and a radical scavenger are added, but a functional group having an ultraviolet absorption function and a radical scavenger function is incorporated in the resin skeleton. Bleed-out due to long-term use can be suppressed.

In addition, since the permeation prevention part 70 prevents permeation of the resin paint from the surface of the decorative material 60 , it is possible to suppress permeation of the resin paint of the anti-discoloration coating layer 40 into the veneer 20 . As a result, the amount of resin paint used for the anti-discoloration coating film layer 40 can be suppressed, and the manufacturing cost of the wooden decorative material 1 can be suppressed. Furthermore, by making the surface of the anti-discoloration coating layer 40 uniform, the thickness of the anti-discoloration coating layer can be formed uniformly.

In addition, the compounding ratio of the anti-tarnish resin to the anti-tarnish coating layer 40 after curing is relatively high. As a result, the ultraviolet absorption effect of the discoloration prevention coating layer 40 can be increased, and discoloration of the surface 20a of the veneer 20 can be reliably suppressed.

In addition, the mixing ratio of the cross-linking agent (HDI) to the anti-tarnish coating layer 40 after curing is relatively high. A relatively high blending ratio of the cross-linking agent can increase the adhesion between the undercoat 30 and the anti-tarnish coating layer 40 and between the anti-tarnish coating layer 40 and the surface protective coating layer 50 . Also, the higher the mixing ratio of the cross-linking agent, the greater the strength of the anti-discoloration coating layer 40 . Therefore, even if the surface of the wooden decorative material 1 is damaged, the surface 20a of the veneer 20 can be prevented from being exposed to the outside.

Further, when the anti-discoloration coating layer 40 has high strength, the anti-discoloration coating layer 40 can be made thin. Normally, when the amount of the cross-linking agent added to the discoloration-preventing resin increases, it is considered that the ultraviolet absorption function and the radical scavenging function of the discoloration-preventing resin are inhibited. However, with the addition amount of the cross-linking agent of the present embodiment, the anti-tarnish coating layer 40 can be made relatively thin while maintaining the function of the anti-tarnish resin. Furthermore, when the anti-tarnish coating layer 40 is thin, the amount of the anti-tarnish resin used can be suppressed, so that the manufacturing cost of the wooden decorative material 1 can be suppressed.

In addition, the surface protective coating layer 50 can prevent the surface of the wooden decorative material 1 from being damaged and the discoloration preventing coating layer 40 from being exposed to the outside. The UV absorption function of the anti-tarnish coating layer 40 can be secured for a relatively long period of time.

For example, in a wooden decorative material manufactured by adhering a sheet to a decorative material, the sheet may be stored in a wound state before being adhered. In this case, if the blending ratio of the cross-linking agent to the sheet is increased, the strength of the sheet increases, and cracks may occur during winding. On the other hand, since the discoloration prevention coating film layer 40 of the present embodiment is formed of the coating film on the decorative material 60, such a problem is less likely to occur. Therefore, the strength of the anti-discoloration coating layer 40 can be increased and the thickness of the anti-discoloration coating layer 40 can be reduced.

In addition, the discoloration prevention coating layer 40 and the surface protection coating layer 50 are formed by coating on the veneer 20 which is the surface of the decorative material 60 . As a result, the anti-discoloration coating layer 40 and the surface protective coating layer 50 are less likely to peel off from the surface 20a of the veneer 20, as compared with the case where the sheet is attached to the substrate surface. In addition, since it is not necessary to cut the veneer 20 according to the size of the sheet and attach them together, the wooden decorative material 1 can be manufactured simply and in a relatively short period of time.

In addition, since the wooden decorative material 1 of the present embodiment includes the anti-discoloration coating layer 40 having a function of suppressing discoloration, the color of the separately provided colored layer can be made lighter, or the colored layer itself can be omitted. . The colored layer is provided for the purpose of making the discoloration of the wooden decorative material 1 inconspicuous. The transparent feature of the surface of the decorative material 60 (the veneer 20) is utilized, and the design of the wooden decorative material 1 can be improved.

The functional group having a radical scavenging function of the discoloration preventing resin of the wooden decorative material 1 according to this embodiment is a hindered amine group. Hindered amine groups can be rendered harmless by reacting with radicals generated by ultraviolet rays.

The permeation prevention portion 70 according to the present embodiment includes the surface layer portion 20b obtained by impregnating the cosmetic material 60 with resin and curing the resin, and the undercoat portion 30 forming the surface of the cosmetic material 60 .

The hardened surface layer portion 20b impregnated with resin and the undercoat portion 30 suppress permeation of the resin paint from the surface 20a of the veneer 20. - 特許庁Therefore, it is possible to reliably prevent the resin paint of the anti-discoloration coating layer 40 formed on the surface of the decorative material 60 from penetrating into the decorative material 60 .

In addition, by making the surface of the decorative material 60 uniform by the permeation prevention part 70, the discoloration prevention coating film layer 40 having a uniform thickness can be easily formed. In addition, when the discoloration prevention coating layer 40 has a uniform thickness, it is possible to suppress uneven discoloration on the surface of the wooden decorative material 1 due to use of the wooden decorative material 1 over time.

In addition, the undercoat 30 functions as a binder resin, and can improve the adhesion between the surface 20a of the veneer 20 and the anti-discoloration coating layer 40 . As a result, the anti-discoloration coating layer 40 can be made difficult to peel off from the decorative material 60 .

The surface protective coating film layer 50 according to this embodiment contains a resin having an ultraviolet curing effect.

Here, in the conventional discoloration prevention coating layer to which an ultraviolet absorber is added, when a layer containing an ultraviolet curing agent is laminated on the surface of the discoloration prevention coating layer, the ultraviolet absorber added to the resin Curing of the layer containing the ultraviolet curing agent may be inhibited.

In the present embodiment, as described above, the discoloration prevention coating layer 40 uses a resin having a functional group having an ultraviolet absorbing function. Even if a layer containing is laminated, there is no risk that curing will be inhibited by the ultraviolet absorber during ultraviolet irradiation. As a result, the surface protective coating layer can be cured relatively easily by irradiating with ultraviolet rays. Moreover, in order to avoid curing inhibition of the surface protective coating layer 50, it is unnecessary to provide a predetermined layer between the discoloration preventing coating layer 40 and the surface protective coating layer 50. FIG.

In addition, the surface protective coating film layer 50 is cured by being irradiated with ultraviolet rays after coating. Since there is no need to cure by drying, the uniform surface protective coating layer 50 can be formed simply and in a relatively short period of time.

In addition, the strength of the surface protective coating layer can be increased by forming the surface protective coating layer 50 into a plurality of layers. As a result, even if the surface protection coating layer 50 is scratched, the discoloration prevention coating layer 40 can be prevented from being exposed to the outside.

In addition, since the surface protective coating film layer 50 is not an organic solvent-based coating film, it is possible to suppress the effects on the human body from the viewpoint of VOCs (volatile organic compounds).

The anti-discoloration coating film layer 40 of the wooden decorative material 1 according to the present embodiment contains two types of ultraviolet absorbers. By adding an ultraviolet absorber, the anti-tarnish coating layer 40 can also absorb ultraviolet light in a wavelength range different from the wavelength range in which the anti-discoloration resin exhibits a particular ultraviolet absorption effect. Furthermore, by combining two types of ultraviolet absorbers having different absorption effects depending on the wavelength range of ultraviolet rays, ultraviolet rays in a relatively wide wavelength range can be absorbed. As a result, discoloration of the veneer 20 of the wooden decorative material 1 can be reliably suppressed.

In addition, since the wavelength range of absorbed ultraviolet rays differs depending on the tree species of the veneer 20, the ultraviolet absorber can be selected according to the tree species of the veneer 20 to be used. As a result, veneers 20 of various tree species can be selected, so that the variation of wooden decorative material 1 can be increased.

In addition, since the anti-discoloration coating layer 40 of the present embodiment is relatively thin, the density of the ultraviolet absorber in the anti-discoloration coating layer 40 can be relatively high even if the amount of the added ultraviolet absorber is relatively small. can be done. As a result, the UV absorption effect of the discoloration preventing coating layer 40 can be increased, and the manufacturing cost of the wooden decorative material 1 can be suppressed.

In this embodiment, the anti-discoloration coating film layer 40 contains 10 parts by weight or more and 50 parts by weight or less of a cross-linking agent with respect to 100 parts by weight of the anti-discoloration resin. Since the mixing ratio of the cross-linking agent to the discoloration-preventing resin is relatively high, the physical strength of the discoloration-preventing coating layer 40 can be increased, and peeling of the discoloration-preventing coating layer 40 from the decorative material 60 can be suppressed.

In addition, the anti-discoloration coating film layer 40 can be made thinner due to its high strength, and as a result, the amount of discoloration-preventive resin used can be suppressed, so that the manufacturing cost of the wooden decorative material can be suppressed.

In this embodiment, the anti-discoloration coating layer 40 contains 50% by weight or more and 80% by weight or less of the anti-discoloration resin with respect to the anti-discoloration coating layer 40 after curing. Since the mixing ratio of the discoloration-preventing resin in the discoloration-preventing coating layer 40 is relatively high, the discoloration-preventing effect of the wooden decorative material can be increased.

In this embodiment, the anti-tarnish coating layer 40 has a thickness of 0.3 μm or more and 10 μm or less. Since the discoloration-preventing coating layer 40 is relatively thin, the amount of the composition that constitutes the discoloration-preventing coating layer 40 can be reduced .

<Other embodiments>
The decorative material 60 does not have to be obtained by bonding the veneer 20 to the base material layer 10 . The decorative material 60 may be a plate-shaped piece of wood. The decorative material 60 may be only the veneer 20 . Even veneers that are easily discolored can be prevented from being discolored by sunlight over a long period of time. Since the permeation prevention part 70 is provided on the surface, even if a veneer into which paint or the like easily permeates is used, the permeation prevention part 70 is brought into contact with the permeation prevention part 70 on the surface of the veneer without permeation of the expensive anti-discoloration resin. The anti-discoloration coating film layer 40 can be efficiently provided with a thin uniform layer, which can also contribute to cost reduction. In addition, the permeation prevention portion 70 on the surface of the veneer 20 may be efficiently provided with a thin uniform layer to prevent discoloration via a colored layer.

The facing material 60 may be solid wood, solid laminated wood, laminated wood, dry veneer, or raw veneer (wet veneer).

The tree species of the veneer 20 is not limited. The veneer 20 material may be oak, maple, perch, or the like. The veneer 20 may be formed by combining a plurality of tree species.

The anti-discoloration resin may be any functional group that maintains the radical scavenging function. Specifically, the discoloration prevention resin contained in the undercoat layer 30 and the discoloration prevention coating layer 40 in contact with the discoloration prevention coating layer 40 is degraded by ultraviolet rays, and the discoloration prevention coating layer is a functional group having an ultraviolet absorption function. When the (hindered amine group) is oxidized by ultraviolet rays to generate radicals, the radicals are repeatedly oxidized and react with oxygen in the air to generate peroxide radicals. At this time, the hindered amine group is oxidized by ultraviolet rays to generate a nitroxy radical, but the nitroxy radical reacts with the peroxide radical to change the peroxide radical into a harmless stable substance, and itself Back to nitroxy radicals. In this way, the hindered amine group efficiently scavenges radicals generated due to deterioration of the resin, prevents progression of deterioration due to chain oxidation, and can maintain this radical scavenger function over a long period of time cyclically. Thus, the functional group having a radical scavenging function may be a functional group having a function of cyclically scavenging radicals such as a hindered amine group, and includes a photostabilizing group other than a hindered amine group having a similar function. .

The permeation prevention portion 70 may be either the surface layer portion 20 b formed by impregnating the decorative material 60 with resin and hardened, or the undercoat portion 30 formed on the surface of the decorative material 1 . As a result, it is possible to prevent the resin paint of the anti-discoloration coating layer 40 from penetrating into the veneer 20 .

The surface protective coating layer 50 may not contain an ultraviolet curing initiator. In this case, the resin constituting the surface protective coating film layer 50 is exemplified by, for example, a urethane resin.

The anti-tarnish coating layer 40 may not contain an ultraviolet absorber. That is, the anti-tarnish coating layer 40 may consist of only the anti-tarnish resin and the cross-linking agent. For example, if the material of the veneer 20 is maple, perch, or the like, the wavelength range of ultraviolet rays absorbed by the veneer 20 is within the range of the wavelength range of ultraviolet rays that can be absorbed by the discoloration prevention resin. No need to add. Thus, depending on the tree species used for the veneer 20, it is not necessary to add an ultraviolet absorber. When the UV absorber is not included, the content of at least one of the anti-tarnish resin and the cross-linking agent in the anti-tarnish coating layer 40 can be increased.

The ultraviolet absorber added to the anti-tarnish coating layer 40 may particularly absorb ultraviolet rays in the same wavelength range as the ultraviolet-absorbing effect of the anti-tarnish resin. In this case, the ultraviolet absorption amount of the discoloration prevention coating layer 40 can be increased as compared with the discoloration prevention coating layer 40 containing no ultraviolet absorber.

One type or three or more types of ultraviolet absorbers may be added to the anti-tarnish coating layer 40 . The type of ultraviolet absorber to be used may be selected according to the wavelength range of ultraviolet rays absorbed by the lumber used for the veneer 20 .

A colored layer may be provided between the discoloration prevention coating layer 40 and the permeation prevention portion 70 . The color of the colored layer is selected based on the color of the surface of the decorative material 60 (projecting plate 20). A dye or a pigment is used as the colorant used in the colored layer, and a pigment is preferably used. Since the wooden decorative material 1 of the present invention is provided with the anti-discoloration coating layer 40 having a function of suppressing discoloration, it is possible to use a relatively light-colored coloring agent or to make the thickness of the colored layer relatively thin. As a result, the natural texture derived from the wood is emphasized while taking advantage of the transparency characteristic of the surface (the veneer 20) of the decorative material 60 impregnated with the resin in the permeation prevention portion 70, thereby enhancing the design of the wooden decorative material 1. can be improved.

When the surface protective coating layer 50 is formed of multiple layers, only the bottom layer should contain the ultraviolet curing initiator. Alternatively, the surface protective coating layer 50 may be composed of only one layer containing an ultraviolet curing initiator.

The anti-tarnish coating layer 40 may contain a radical scavenger. Here, the radical scavenger may be any material as long as it scavenges radicals generated in the anti-discoloration coating layer 40 by ultraviolet rays, and examples thereof include hindered amine light stabilizers and antioxidants. Hindered amine light stabilizers include, for example, bis(1,2,2,6,6-pentamethyl-4-piperidyl)[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl] Methyl] butyl malonate, bis (1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, methyl (1,2,2,6,6-pentamethyl-4-poperidinyl) sebacate, bis decanedioate (2,2,6,6-tetramethyl-1(octyloxy)-4-piperidinyl)ester and the like, mixtures thereof, modified products, polymers, derivatives thereof and the like are used. Antioxidants include, for example, phenol antioxidants, phosphorus antioxidants, sulfur antioxidants, and titanium dioxide. Hindered phenolic antioxidants and titanium dioxide are preferably used.

INDUSTRIAL APPLICABILITY The present invention can suppress discoloration of the surface of the wooden decorative material 1 for a relatively long period of time, and thus has high industrial applicability.

REFERENCE SIGNS LIST 1 wooden decorative material 10 base material layer 20 veneer 20b surface layer portion 30 undercoat portion 40 anti-discoloration coating layer 50 surface protective coating layer 60 decorative material 70 permeation prevention portion

Claims (9)

a decorative material having a permeation prevention part that prevents permeation of paint from the surface;
A discoloration prevention coating layer formed on the surface of the decorative material;
A surface protective coating layer formed on the surface of the anti-tarnish coating layer,
The discoloration-preventing coating layer contains a discoloration-preventing resin having a functional group having an ultraviolet absorption function and a functional group having a radical scavenging function, and a cross-linking agent that crosslinks the discoloration-preventing resin ,
The cross-linking agent contained in the anti-tarnish coating layer is 10 parts by weight or more and 50 parts by weight or less with respect to 100 parts by weight of the anti-tarnish resin,
The surface protective coating layer contains an acrylic resin and an ultraviolet photopolymerization initiator.
A wooden decorative material characterized by: a decorative material having a permeation prevention part that prevents permeation of paint from the surface;
A discoloration prevention coating layer formed on the surface of the decorative material;
A surface protective coating layer formed on the surface of the anti-tarnish coating layer,
The discoloration-preventing coating layer contains a discoloration-preventing resin having a functional group having an ultraviolet absorption function and a functional group having a radical scavenging function, and a cross-linking agent that crosslinks the discoloration-preventing resin,
The cross-linking agent contained in the anti-discoloration coating layer is 20% by weight or more and 50% by weight or less with respect to the anti-discoloration coating layer after curing,
The surface protective coating layer contains an acrylic resin and an ultraviolet photopolymerization initiator.
A wooden decorative material characterized by: In claim 1 or 2,
The wooden decorative material, wherein the anti-discoloration coating layer contains an ultraviolet absorber that absorbs ultraviolet rays having a wavelength of 350 nm or more. In any one of claims 1 to 3,
The anti-tarnish resin absorbs UV light up to 360 nm
A wooden decorative material characterized by: In any one of claims 1 to 4 ,
The decorative wood material, wherein the functional group having a radical scavenging function is a hindered amine group. In any one of claims 1 to 5 ,
The wooden decorative material, wherein the permeation prevention portion is at least one of a surface layer portion formed by impregnating the decorative material with a resin and hardened, and an undercoat portion forming a surface of the decorative material. In any one of claims 1 to 6 ,
A wooden decorative material, wherein the anti-discoloration coating film layer contains the anti-discoloration resin in an amount of 50% by weight or more and 80% by weight or less relative to the anti-discoloration coating film layer after curing. In any one of claims 1 to 7 ,
A wooden decorative material, wherein the anti-discoloration coating layer is formed to have a thickness of 0.3 μm or more and 10 μm or less. The wooden decorative material according to any one of claims 1 to 8 , wherein the decorative material is a veneer.

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