JP3029558B2 - Manufacturing method of high gloss finish decorative board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a high-gloss decorative board used for a door on a vertical surface such as a door of kitchen furniture or a shelf of a showcase.

[0002]

2. Description of the Related Art In recent years, glossy furniture doors and showcase shelves have tended to be preferred. The conventional decorative plate was produced by polishing the intermediate plate in contact with the melamine resin layer by polishing or the like during press molding and transferring the gloss to the surface of the decorative plate. However, the surface of the veneer has a "pattern" during the hot forming of the decorative plate. Recently, a high-gloss decorative board made of a vinyl chloride sheet using a membrane press has been proposed, but has a drawback that the surface is easily scratched.

[0003] Decorative boards are mainly attached to wood-based boards such as plywood, MDF and particle board, and are used as decorative boards for doors of kitchen furniture and shelf boards of showcases. A vinyl-based adhesive, an ethylene-vinyl acetate-based adhesive or a rubber-based adhesive is applied to both the decorative board and the wood-based board and bonded. In this method, moisture contained in the adhesive is absorbed by the wooden board, and fine unevenness is often formed, or uneven fineness of the adhesive often causes partial fine unevenness on the decorative board.

[0004] In the conventional decorative board, even in such a method,
Although it was possible to process the decorative board without impairing the appearance of the decorative board due to the unevenness of the decorative board itself, the heat deformation temperature used in the present invention was 80 to 120 ° C using a thermoplastic film. A decorative board with no fine irregularities on the surface, such as a high-gloss melamine decorative board made by laminating a paper base material impregnated with a thermosetting resin on top of it and further laminating a melamine resin-impregnated paper base material on the surface and heating and pressing. In the case where is bonded to a wooden board, the presence or absence of fine irregularities of the adhesive significantly affects the surface of the decorative board, and a sufficiently high glossy surface cannot be obtained in many cases.

[0005] There is a method of preventing fine irregularities by using a putty putty or the like, but this method is originally intended to prevent the base material from being damaged or uneven, and the cost is greatly increased when the method is applied to the entire surface. In addition, when a decorative plate is bonded, the adhesive strength is not sufficiently exhibited, which is not a preferable method.

[0006]

As described above, the present invention enables the production of a decorative board having a high gloss finish, which has been difficult with the conventional method of manufacturing a decorative board.

[0007]

According to the present invention, a heat-curing resin is impregnated on a paper substrate impregnated with a thermosetting resin at a heat deformation temperature of 80 to 120 ° C.
A melamine resin decorative board made by placing a thermoplastic film that is a thermosetting resin impregnated paper base A process for producing a high-gloss finish decorative board, wherein the surface of the wooden board is subjected to a primer treatment with a polyisocyanate resin.

The present inventors have found that if the surface of a wooden board is treated with a primer with a polyisocyanate, a moisture-proof effect can be exhibited, and -NC of the polyisocyanate resin can be obtained.
Focusing on the reaction between the O group and the -COOH group in the vinyl acetate-based adhesive, a polyisocyanate resin is applied to the surface of the wooden board and cured, and then the adhesive is applied to the decorative board and the wooden board. And developed a technology to bond them together. As the adhesive to be used, any adhesive such as an epoxy resin-based, rubber-based, polyvinyl acetate-based, ethylene-vinyl acetate-based copolymer-based adhesive may be used. Accordingly, a polyvinyl acetate-based or ethylene-vinyl acetate copolymer-based adhesive is preferred. The wood board used may be any of plywood, MDF and particle board.

The thermoplastic film has a heat distortion temperature of 80 to 1
20 ° C. With a heat deformation temperature in this range, the adhesiveness at the time of molding and the gloss and heat resistance of the obtained decorative board are compatible, and the decorative board bonded to the wooden board has excellent gloss, The characteristics are also excellent. As the thermoplastic film, an ABS film having a thickness of 100 to 250 μm is preferable for maintaining adhesion and gloss.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic sectional view of a high-gloss decorative board according to the present invention, in which a thermoplastic material is inserted between core layers (3) and (5) made of a thermosetting resin-impregnated base material. The film (4) is overlaid, and then the decorative layer (2) made of a melamine resin-impregnated base material and the surface layer (1) made of a thin melamine resin-impregnated base material are sequentially stacked, and if necessary, a core material layer (3) The shielding layer is inserted between the and the decorative layer (2), and the whole is heated and pressed to be integrated.

Next, FIG. 2 is a schematic sectional view of an example of a decorative board in which the decorative board (6) is bonded to a wooden board (10). The surface of the wooden board is coated with a roll coater or a brush. 1.5 to 1.5 polyisocyanate resin (9)
After applying ² g / 300 × 300 mm ² and air-drying for 4 hours or more, apply a 4-5 g / 300 × 300 mm ^{2 of} vinyl acetate adhesive (7, 8) to the decorative board and the wooden board, respectively, Attach the board and the wooden board. In addition, as a method of applying the adhesive, a method using a roll coater is preferable because of easy adjustment of the amount of application.

In the present invention, as a polyisocyanate resin used for moisture-proofing a wood board, T is used.
Any of DI system, HDI system, and IPDI system may be used. In addition, it is preferable to air dry the polyisocyanate resin for 4 hours or more after coating. If the adhesive is applied immediately after coating, the coating is not sufficiently formed and the waterproof effect is small, and the effect of preventing the moisture in the adhesive from permeating the board cannot be sufficiently exhibited. However, it is not possible to completely eliminate the fine irregularities after bonding.

[0013]

【Example】

Example 1 A kraft paper having a basis weight of 195 g / m ² was impregnated with a water-soluble phenol resin and dried on a piece of impregnated paper having a resin content of 35%, which had a thickness of 150 μm and a heat deformation temperature of 100 ° C. Overlay the ABS film, then impregnated paper 1 as above
A decorative layer having a resin content of 50% obtained by impregnating and drying a melamine resin on a piece of paper and a decorative paper having a basis weight of 120 g / m ² is sequentially superimposed on each other. The mirror-finished stainless steel plates as described above were stacked, and heated and pressed under the conditions of 160 ° C. and 100 kg / cm ² to obtain a 0.7-mm thick high-gloss melamine resin decorative plate. The back surface of this decorative board is sanded with sandpaper, and 4-5 g of vinyl acetate-based adhesive (ESDUINE 5401W manufactured by Sekisui Chemical) / 300 × 300 m
It was coated by m ² roll coater. On the other hand, MDF was used as a wood-based board, and 1 g of TDI-based polyisocyanate resin (L-75 manufactured by Sumitomo Bayer) was applied to the surface of the board.
/ 300 × 300mm Coating with ² roll coater,
After air drying for 4 hours, use a vinyl acetate adhesive (Sekisui Chemical
Esdine 5401W) 4-5g / 300x300
Coating was performed with a mm ² roll coater, and a decorative board and MDF were bonded to obtain a high-gloss decorative board.

Example 2 High gloss was obtained in the same manner as in Example 1 except that an HDI-based polyisocyanate resin (N-75 manufactured by Sumitomo Bayer) was used as the polyisocyanate resin applied to the MDF. I got a makeup board.

<< Comparative Example 1 >> Until a decorative plate was obtained, the same procedure as in the Example was carried out.
Coating was performed with a × 300 mm ² roll coater. MDF
No primer treatment with a polyisocyanate resin, and 7-8 g of vinyl acetate adhesive / 300 × 3
Coating was performed with a 00 mm ^two- roll coater, and both were laminated to obtain a decorative board.

[0016] "Comparative Example 2" basis weight 195 g / m ² kraft paper three sheets of water-soluble phenolic resin impregnated dry resin content of 35% of the impregnated paper obtained, further, a basis weight of 120 g / m ²
Resin obtained by impregnating and drying melamine resin on decorative paper
% Of a decorative layer, and a mirror-finished stainless steel plate having a value measured by a gloss meter of 300 or more as a stainless steel plate is superimposed on the decorative layer at 160 ° C. and 100 kg / c.
heated pressure molding under the conditions of m ^2, to obtain a veneer having a thickness of 0.8 mm, and the sanding process by sand paper backside, 7~8g / 300 × 300m vinyl acetate-based adhesive
The m ² roll coater to a coating. Further, MDF is not subjected to a primer treatment with a polyisocyanate resin, and a vinyl acetate-based adhesive is used in an amount of 7 to 8 g / 300 × 300.
Coating was performed using a mm ² roll coater, and both were laminated to obtain a decorative board.

The appearance of each decorative board after processing and the planar tensile strength of the decorative board were evaluated according to the JAS test method, and the results shown in Table 1 were obtained. The surface decorative layer used was gravure printing paper.

Table 1 外 観 Appearance after processing Plane tensile strength (kg / cm ² ) ─── ────────────────────────── Example 1 High gloss and smooth surface 4 or more Example 2 High gloss and smooth surface 4 or more Comparative Example 1 Nashiji There is a tendency of pattern 4 or more Comparative Example 2 Swelling on the surface 4 or more ─────────────────────────────

In the example, a decorative board having a high gloss and a smooth surface could be obtained by preventing fine irregularities due to the adhesive. Also, the plane tensile strength is JA
Clears S standard of 4 kg / cm ² or more.

[0020]

The method for producing a high-gloss decorative board of the present invention is based on the conventional method of attaching a decorative board to a wood-based board. In addition, a decorative board sufficiently exhibiting smoothness can be provided. The obtained decorative board is suitable for system kitchen doors and showcase shelves, etc., which require a sense of luxury, and the amount of adhesive used can be reduced to about half, thereby greatly reducing processing costs. it can.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of an example of a high gloss decorative board of the present invention.

FIG. 2 is a schematic sectional view of an example of the high gloss decorative board of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surface layer 2 Decorative layer 3 Core material layer 4 Thermoplastic film 5 Core material layer 6 Decorative board 7 Vinyl acetate adhesive layer 8 Vinyl acetate adhesive layer 9 Polyisocyanate resin primer layer 10 Wood board

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-155732 (JP, A) JP-A-56-19757 (JP, A) JP-A-5-140339 (JP, A) JP-A 8- 90508 (JP, A) JP-A-7-178864 (JP, A) JP-A-8-34094 (JP, A) JP-A-9-39191 (JP, A) JP-A-9-29893 (JP, A) JP-A-5-318669 (JP, A) JP-A-7-108647 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35/00

Claims (2)

(57) [Claims] 1. A paper base material impregnated with a thermosetting resin,
A thermoplastic film having a heat deformation temperature of 80 to 120 ° C. is provided, a paper base material impregnated with a thermosetting resin is provided, and a melamine resin-impregnated paper base material is further laminated on the surface, and heated and pressed. A method for producing a decorative board having a high gloss finish, characterized in that when the decorative melamine resin board is bonded to a wooden board, the board surface is subjected to a primer treatment with a polyisocyanate resin. 2. A thermoplastic film having a thickness of 60 to 150 μm.
2. The method for producing a decorative board according to claim 1, wherein the decorative board is an ABS film.