JP5594507B2 - Composite decorative board - Google Patents

Description

The present invention relates to a composite decorative board composed of a non-combustible board and a wooden substrate.

Conventionally, it has been stipulated by the Fire Service Act to use non-combustible plates (non-combustible materials) for the hanging cabinets that are in contact with the enclosure near the ventilation fan, which is called the range hood of the kitchen / sink. The method (incombustibility test) is stipulated in Article 2-9 of the Building Standards Act (decree 108-2). However, the non-combustible plate alone has the drawbacks of cracking when screwed in with a wood screw to secure the door mounting bracket, and cracking if the wooden dowel used for assembly is driven when assembling the box. For this reason, a method has been used in which an incombustible plate and a wooden board are bonded together with an adhesive. In other words, the incombustible plate is arranged on the fire side to ensure the incombustibility by the incombustible plate, and the processing suitability for wood screws and wooden dowels is handled by the wood plate.

Examples of the substrate used for the incombustible material include a calcium silicate board, a gypsum board, and a volcanic glassy return layer board, all of which are moisture permeable. Further, it is known that a wood board is excellent in processability but is likely to be warped due to moisture absorption. Therefore, it is conceivable to produce a structure such as a hanging cupboard by combining a non-combustible plate and a wooden board as described above. However, for these structures, warpage is large in terms of dimensional stability and design. It becomes a problem.

On the other hand, a wooden board excellent in warpage prevention in which a composite sheet made of metal foil, a synthetic resin sheet, and paper is laminated on at least one surface of a wooden board via an adhesive has been proposed (see, for example, Patent Document 1). ).

Therefore, by adopting a wooden board excellent in warpage prevention, by sticking to the incombustible plate with an adhesive via a composite sheet having a metal foil, to prevent the movement of moisture between the incombustible board and the wooden board, A method of forming a composite incombustible plate that suppresses warpage is also conceivable.

However, when the incombustibility test is performed by bringing the flame closer from the incombustible plate side, even if the incombustible plate can suppress the combustion, the adhesive on the bonding surface of the incombustible plate and the wood board has no heat resistance. Due to heat conduction, there is a risk of peeling from the adhesive surface or the composite sheet surface, and structures such as hanging cabinets are easily disassembled, resulting in a large fire.
Japanese Patent No. 3185675

An object of the present invention is to provide a composite decorative board that is not easily decomposed even in the event of a fire, and further has excellent surface properties and reduced warpage.

As a result of intensive studies to achieve the above object, the present inventors have provided a moisture-proof layer having a metallic layer between the non-combustible plate and the wooden substrate, so that heat is generated by the metallic layer even in the event of a fire. It is possible to prevent the heat from being diffused and accumulated locally, and also to suppress the movement of water between the non-combustible plate and the wooden substrate, thus reducing the occurrence of warpage and using a specific adhesive. As a result, it was found that the structure can be prevented from being easily decomposed, and the present invention has been completed.

That is, the present invention is a composite decorative board composed of a non-combustible plate and a wooden substrate, wherein one surface of the non-combustible plate and one surface of the wooden substrate are provided with a moisture-proof layer having a metallic layer. The present invention provides a composite decorative board characterized by being bonded with a moisture curing type urethane resin reactive hot melt adhesive.

According to the present invention, by providing a moisture-proof layer having a metallic layer between the non-combustible plate and the wooden substrate, heat is diffused by the metallic layer even in the event of a fire, and heat is locally accumulated. In addition, the use of a moisture-curing urethane resin reactive hot melt adhesive can prevent the structure from being easily decomposed. Furthermore, by providing a moisture-proof layer having a metallic layer between the non-combustible plate and the wooden substrate, moisture movement between the non-combustible plate and the wooden substrate is suppressed, and the occurrence of warpage can be significantly reduced.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a composite incombustible plate according to the present invention.

As shown in FIG. 1, the composite non-combustible plate 1 according to the present invention is composed of a non-combustible plate 2 and a wooden substrate 3. Examples of the non-combustible plate 2 include a calcareous plate, a gypsum board, and a volcanic vitreous layered plate, which are excellent in properties such as flame retardancy and antiseptic properties. A plate (JIS A 5440: 2003) is preferred. Moreover, as the board | substrate 3 based on wood, a particle board, a plywood, a medium density fiber board (MDF) etc. are mentioned.

Examples of the metallic layer provided on the moisture-proof layer 4 formed between the non-combustible plate 2 and the wooden substrate 3 include a metal foil, a metal vapor deposition film, and a metal sputtering film. The thickness of the metal foil may be 5 to 20 μm from the viewpoint of moisture resistance and thermal conductivity, and a thickness of 7 to 15 μm is preferable from the viewpoint of functional surface, workability, cost, and the like. Examples of the metal foil include copper foil and aluminum foil, and aluminum foil is preferable from the viewpoint of availability and ease of processing.

The moisture-proof layer 4 may be formed of only the above-mentioned metal layer. However, in terms of the adhesion between the non-combustible plate 2 and the wooden substrate 3 and the workability of the moisture-proof layer 4, a composite sheet having a paper material / metal foil structure A composite sheet having a structure of paper material / metal foil / paper material is preferable, and a composite sheet having a structure of paper material / PE (polyethylene) / metal foil formed by extrusion lamination is particularly preferable. The kind and thickness of the metal foil in the case of these composite sheets may be the same as those described above, and in the case of a composite sheet by extrusion lamination, the thickness of PE is preferably 10 to 50 μm, particularly preferably 10 to 30 μm. . In addition, as total thickness of various composite sheets, it is set as 40-200 micrometers, and it is especially preferable to set it as 50-100 micrometers.

When the metal layer is a metal vapor deposition film or a metal sputtering film, it can be directly formed on the incombustible plate 2 or the wood substrate 3, but from a practical point, it is applied to a paper material or a resin sheet. It is preferable to use this sheet material after forming. Since it is not economical to make the film thickness as thick as the metal foil in this case, it is usually about 0.5 μm to 10 μm. However, in terms of moisture resistance and thermal conductivity, the metal foil is more preferable. Is in terms of performance.

When the moisture-proof layer 4 is composed of only a metal layer, the surface side of the metal layer is naturally bonded to the surface side of the non-combustible plate 2 and the surface side of the wooden substrate 3. In the case of a composite sheet with a foil structure or a composite sheet with a paper material / PE / metal foil structure, the surface side of the paper material is bonded to the surface side of the incombustible plate 2 and the surface side of the metal layer is made of wood. Adhesive strength can be secured by bonding to the surface side of the substrate 3.

In this case, it is important that the adhesive is a moisture-curing urethane resin reactive hot melt adhesive in terms of heat resistance and adhesive strength. The moisture-proof layer 4 is firmly bonded by adopting the moisture curing type urethane resin reactive hot melt adhesives 5 and 6. This moisture-curing urethane resin reactive hot melt adhesive reacts with moisture and cures. After the reaction is completed, it forms a tough film and exerts a strong adhesive force. Even if it permeates from the 2 side or the wooden substrate 3 side, unlike the aqueous adhesive or EVA hot melt adhesive, it becomes possible to maintain heat resistance and strong adhesive force. Furthermore, EVA hot melt adhesives are solidified due to anchoring effects, so they melt easily when reheated. However, moisture-curing urethane resin reactive hot melt adhesives melt even when reheated after curing. Therefore, even in the event of a fire, the non-combustible plate 2 and the wooden substrate 3 are not separated and easily disassembled.

In order to prevent the entry of moisture into the non-combustible plate 2 and to ensure the design of the portion visually recognized by a structure such as a hanging cabinet, when moisture enters the non-combustible plate 2, The decorative layer 10 is bonded to the surface side of the incombustible plate 2 of the composite incombustible plate 1 obtained as described above by the adhesives 8 and 9 through the moisture-proof layer 7. In this case, in the water-based adhesive used for general purposes, the decorative layer 10 is swollen by moisture and surface irregularities are generated, or the cured film is soft, so that the decorative layer 10 is easily scratched. From the point of view, non-aqueous adhesives 8 and 9 are preferable.

Examples of the non-aqueous adhesives 8 and 9 include solvent-based adhesives, EVA hot melts, and moisture-curing urethane resin reactive hot melt adhesives. In view of the fact that the surface irregularities of the decorative layer 10 do not easily occur and the design can be secured, a moisture-curing urethane resin-based reactive hot melt adhesive is preferable. The non-aqueous adhesives 8 and 9 may be different types of adhesives, but are preferably the same type of adhesive from the viewpoint of preventing warping after curing, and a moisture-curing urethane resin system. Reactive hot melt adhesives 8 and 9 are particularly preferable.

The moisture-proof layer 7 in this part may be a moisture-proof layer called a ceramic vacuum-deposited film, such as a silica vacuum-deposited PET film. However, in order to prevent heat from being transmitted to the wooden substrate 3 side as much as possible, the moisture-proof layer 4 Similarly, a moisture-proof layer having a metal layer is preferable, and a paper material / metal foil / paper material structure or a paper material / PET / metal foil structure is preferable.

When moisture enters from the other surface of the wooden substrate 3, it may cause warpage, so that moisture can be prevented from entering the wooden substrate 3 and the interior design of a structure such as a hanging cupboard can be secured. Therefore, the decorative layer 14 is bonded to the other surface side of the wood-based substrate 3 of the composite incombustible plate 1 obtained as described above by the adhesives 12 and 13 through the moisture-proof layer 11. In this case as well, as described above, the water-based adhesive that is used for general purposes swells due to moisture and generates surface irregularities, or because the cured film is soft and scratches are likely to occur. The non-aqueous adhesives 12 and 13 are preferable.

Examples of the non-aqueous adhesives 12 and 13 include solvent adhesives, EVA hot melts, moisture-curing urethane resin reactive hot melt adhesives, etc., as described above. Moisture-curing urethane resin reactive hot melt adhesives are preferred because they are hard and scratch resistant, and the surface irregularities of the decorative layer 14 are unlikely to occur and the design can be secured. The non-aqueous adhesives 12 and 13 may be different types of adhesives, but are preferably the same type of adhesive from the viewpoint of preventing warping after curing, and a moisture-curing type urethane resin system. Reactive hot melt adhesives 12 and 13 are particularly preferable.

Hereinafter, the composite incombustible plate according to the present invention will be described with reference to Examples and Comparative Examples.
Example 1
<Incombustible plate>
A non-combustible plate in which a moisture-proof layer 7 of paper material / aluminum foil / paper material was bonded to one surface of the non-combustible plate 2 which is a volcanic glassy return layer plate with a urethane resin 8 was prepared. The incombustible plate 2 is 100 mm × 100 mm × 6 mm, the moisture-proof layer 7 is 80 μm thick, the aluminum foil is 12 μm thick, and the urethane resin 8 is 25 μm thick.

<Wooden substrate>
A substrate was prepared in which moisture-proof layers 4 and 11 of a paper material / PE / aluminum foil by extrusion lamination were bonded to both surfaces of a wooden substrate 3 as a particle board. The moisture-proof layers 4 and 11 have the aluminum foil side surface bonded to the surface side of the wood substrate 3. The wood substrate 3 is 100 mm × 100 mm × 6 mm, the moisture-proof layers 4 and 11 are all 50 μm in thickness, and the aluminum foil is 12 μm in thickness. Adhesives 5 and 12 used for bonding are both moisture-curing urethane resin-based reactive hot melt adhesives (trade name: Tyforce) manufactured by DIC Corporation, and each has a thickness of 40 μm. is there.

<Composite decorative panel>
A moisture curing type urethane resin reactive hot melt adhesive (trade name: Tyforce) manufactured by DIC Corporation was used as the adhesive 6, and a non-combustible plate and a substrate were bonded together to obtain a composite decorative board A. . The thickness of the adhesive 6 is 25 μm.

<Heating test>
When the composite decorative board A was placed horizontally and heated from the non-combustible plate side with a heater at a heat quantity of 50 kW / m ² for 20 minutes, the non-combustible plate and the substrate were bonded together in the initial state. This test method is based on the ISO 5660 exothermic test method (cone calorimeter method).

<Visual inspection>
When the non-combustible plate side of the composite decorative board A after the heating test was visually observed, no local lifting or deformation was found.

(Comparative Example 1)
A composite decorative board B was obtained in the same manner as in Example 1 except that the adhesive 6 was changed to an EVA hot melt adhesive.

<Heating test>
When the composite decorative board B was subjected to a heating test in the same manner as in Example 1, floating or deviation occurred between the non-combustible board and the substrate.

<Visual inspection>
When the incombustible board side of the composite decorative board B after the heating test was visually observed in the same manner as in Example 1, local swelling occurred at the center of heating.

(Comparative Example 2)
A composite decorative board C was obtained in the same manner as in Example 1 except that the adhesives 5 and 6 were EVA hot melt adhesives.

<Heating test>
When the composite decorative board C was subjected to a heating test in the same manner as in Example 1, floating or deviation occurred between the non-combustible board and the substrate. The amount of deviation was larger than that of the composite decorative board B.

<Visual inspection>
When the non-combustible plate side of the composite decorative board C after the heating test was visually observed in the same manner as in Example 1, local swelling occurred in addition to the heating center portion.

(Comparative Example 3)
A composite decorative board D was obtained in the same manner as in Example 1 except that the adhesive 6 was a general-purpose aqueous adhesive.

<Heating test>
When the composite decorative board D was subjected to a heating test in the same manner as in Example 1, the non-combustible board and the substrate were separated from the interface of the adhesive 6.

<Visual inspection>
When the peeled surface of the composite decorative board D after the heating test was observed in the same manner as in Example 1, local swelling occurred everywhere.

(Comparative Example 4)
A composite decorative board E was obtained in the same manner as in Example 1 except that the moisture-proof layer 4 was a ceramic layer of a silica vacuum-deposited PET film.

<Heating test>
When the composite decorative board E was subjected to a heating test in the same manner as in Example 1, a deviation occurred between the non-combustible board and the substrate.

<Visual inspection>
When the non-combustible plate side of the composite decorative board E after the heating test was visually observed in the same manner as in Example 1, local swelling occurred at the heating center portion.

<Humidification test>
When the composite decorative boards A, B, C, D, and E were sealed, and the environmental test was performed at 20 ° C. and 90% RH for 24 hours, none of the composite decorative boards was warped.

<Visual inspection of decorative layer>
On the surface of the moisture-proof layer 7 of the composite decorative board A, B, C, D, E, a non-aqueous adhesive (moisture-curing type urethane resin reactive hot, which uses a general-purpose aqueous adhesive as the adhesive 9) When a decorative paper was laminated as a decorative layer 10 and visually inspected using a melt adhesive), the surface irregularity was noticeable when a water-based adhesive was used, but a non-aqueous adhesive was used. Had excellent surface properties and excellent design properties.

The schematic cross section of the composite decorative board by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Composite decorative board 2 Incombustible board 3 Wood type board | substrate 4 Moisture-proof layer which has a metal layer 5 Moisture-curing type urethane resin reactive hot-melt adhesive 6 Moisture-curing type urethane resin-based reactive hot melt adhesive 7 Moisture-proof layer 8 Non-aqueous adhesive 9 Non-aqueous adhesive 10 Cosmetic layer 11 Moisture-proof layer 12 Non-aqueous adhesive 13 Non-aqueous adhesive 14 Cosmetic layer

Claims (8)

A composite decorative board composed of a non-combustible plate and a wooden substrate, wherein one surface of the non-combustible plate and one surface of the wooden substrate are of a moisture-curing type through a moisture-proof layer having a metallic layer. A composite decorative board, which is bonded with a urethane resin-based reactive hot melt adhesive. The composite decorative board according to claim 1, further comprising a decorative layer. The composite decorative board according to claim 1, wherein a decorative layer is bonded to the other surface of the non-combustible board with a non-aqueous adhesive through a moisture-proof layer. The composite decorative board according to claim 3 , wherein the non-aqueous adhesive is a moisture-curing urethane resin reactive hot melt adhesive. The composite decorative board according to claim 3 or 4 , wherein the moisture-proof layer provided on the other surface of the non-combustible board has a metallic layer. The composite decorative board according to any one of claims 1 to 5 , wherein a decorative layer is bonded to the other surface of the wooden substrate with a non-aqueous adhesive through a moisture-proof layer. The composite decorative board according to claim 6 , wherein the non-aqueous adhesive is a moisture curing type urethane resin reactive hot melt adhesive. The composite decorative board according to claim 6 or 7 , wherein the moisture-proof layer provided on the other surface of the wooden substrate has a metallic layer.

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