JPH07164405A - Production of veneer laminated decorative panel - Google Patents

Abstract

PURPOSE:To provide a method for producing veneer laminated decorative panel capable of easily obtaining a film rich in smoothness and having desired glossiness without evaporating and drying the solvent of the film applied to the surface of veneer and enhancing the close adhesiveness of the film and the veneer. CONSTITUTION:Veneer is laminated to a plate-shaped base material using a thermosetting adhesive and a undercoat agent is applied to the veneer and, subsequently, a film composed of a thermosetting resin compsn. is formed and covered with a synthetic resin film to be cured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a decorative board to which a wood board is applied, in which the texture of the wood board is utilized to improve the smoothness and durability of the surface, in applications such as wall surfaces of buildings, housing equipment and furniture. Regarding manufacturing method.

[0002]

2. Description of the Related Art Heretofore, a decorative board with a glazed board has generally been coated with a paint having transparency in terms of appearance and physical properties of the surface. Such a veneer-coated veneer is a plywood, medium-quality fiberboard, particle board, etc., and a veneer veneer sliced from wood is bonded with an adhesive, surface polishing, coloring, etc. After that, the synthetic resin paint is applied several times to finish.

The coating method includes a flow coater, a reverse coater, spraying with a spray gun, etc. However, except for the final finish coating, it was necessary to dry and harden the coating surface every time it was applied and to perform polishing. In this way, the paints used in the coating method are all dissolved in a solvent, so it is necessary to evaporate the solvent to dry it, the volume is reduced by evaporation of the solvent, and the thickness of the coating film is reduced. Thinning,
A smooth finished surface could not be obtained unless the number of coatings was increased.

When the number of times of application increases, the number of steps required for the coating increases, and since the organic solvent evaporates, there are problems such as the influence on the human body of workers and environmental pollution, and special equipment such as ventilation is required. It was something to do. In addition, if a glossy or matte finish is required depending on the application, a paint with a matting agent must be prepared according to the glossiness, especially for matte finishing. Since the matting agent settles when the paint is left for a long time, the gloss of the painted surface may change unless it is sufficiently stirred before use.

[0005] After a decorative paper having a wood grain print is attached to a board material such as plywood with an adhesive, the surface of the decorative paper is coated with an unsaturated polyester resin which is a liquid thermosetting resin containing no non-reactive solvent. In the method of coating, coating with a synthetic resin film and curing, a decorative paper with a uniform composition and good resin permeability is attached to the surface, so smoothness is good and there is no variation in the decorative sheet. However, since it is attempting to express the grain of wood with printing paper, it has an artificial and monotonous pattern, and it was not possible to express the deep color tone of natural wood and the shiny texture.

Further, in the case where an unsaturated polyester resin is applied after coating a lumber board to a board material and a synthetic resin film is coated and cured, the lumber board which is a natural product is
Ingredients, physical properties differ depending on the type of tree, depending on the type, the resin content contained in the wood board, the adhesive strength between the unsaturated polyester resin coating film and the wood board depending on other components may be reduced, or curing may be hindered, Alternatively, it may cause a defect such as discoloration. Furthermore, since the materials are not homogeneous, there is a difference in the permeability of the resin, and it is difficult to completely remove the air bubbles in the coating film when the penetration time is long.

[0007]

DISCLOSURE OF THE INVENTION According to the present invention, since the thermosetting resin composition applied to the surface of the wood board adhered to the plate-shaped substrate does not contain a non-reactive solvent, the solvent is removed by evaporation. Since the coating process is not required and the coating composition remains approximately 100%, a coating film with a required thickness that is rich in smoothness can be obtained without repeating the coating process. Is obtained. Further, by preventing the inhibition of the curing of the coating film due to the composition and components of the wood board, and preventing the deterioration of the adhesiveness, and improving the physical properties and appearance, and changing the glossiness of the film surface to be coated, the desired It is possible to obtain a glossy and matte finish surface.

[0008]

According to the present invention, a glutinous board is attached to a platy base material with a thermosetting adhesive, and then a primer is applied to the gluing board surface, and a non-coating agent is applied from above. A method for producing a decorative board, which comprises applying a liquid thermosetting resin composition containing no reactive solvent, coating the surface of the thermosetting resin composition with a synthetic resin film and curing the composition. .

The plate-like base material used in the present invention includes wood board materials such as plywood, hardboard, medium-quality fiberboard and particle board, and inorganic board materials such as calcium silicate board,
It is a plastic plate material such as a phenol resin laminated plate.

A thermosetting adhesive is applied onto these plate materials and a wood board is attached. The thermosetting adhesive is applied by a roll coater or the like so as to have an appropriate application amount.

As the thermosetting adhesive, an adhesive made of a thermosetting resin such as urea resin, melamine resin, vinyl urethane resin or the like, or vinyl acetate emulsion and other extenders are added to these thermosetting resin adhesives. An adhesive or the like is used.

The wood board to be attached to the wood board is a wood wood veneer having a thickness of 0.07 to 2.0 mm obtained by cutting various woods with a rotary race or a slicer.
Adhere by pressing with a tumbler etc. at room temperature or in a heated state. When the thickness of the wood plate is 0.07 mm or less, when the resin is applied, the base becomes transparent and easy to see, and defects such as exudation of the adhesive are likely to appear.
If the thickness is 2.0 mm or more, the yield of the wood board is reduced, which is not preferable.

After sticking a wood board to a plate-shaped substrate, the surface of the wood board is polished with abrasive paper or the like to improve smoothness, and an amino resin, an epoxy resin, an acrylic resin, a polyurethane resin is used as a primer. A resin solution such as a silane coupling resin is applied, dried and cured, and the surface is polished as necessary. These resin liquids are prepared by dissolving the above-mentioned resin prepolymer, oligomer or polymer in a soluble organic solvent, have permeability and adhesiveness to the wood board, and are affected by the styrene monomer after drying. It is necessary not to. By applying the resin solution, which is the undercoating agent, the voids of the wood board are filled with resin, and the exudation of resin components contained in the wood board is blocked, strengthening the structure and applying the applied film. Improve adhesion with.

The thermosetting resin composition applied to the surface of the wood board is not suitable as a general coating material that evaporates and drys a volatile solvent in order to coat and cure the film after application. Therefore, a liquid thermosetting resin composition having a viscosity suitable for the coating process, which does not include a non-reactive solvent,
It is desirable that the coating film cures at room temperature to a relatively low temperature, and as the resin suitable for use, unsaturated polyester resin, unsaturated melamine resin, vinyl ester resin are selected, and at least one of these resins is used. To be done.

The unsaturated polyester resin is obtained by condensing an unsaturated polybasic acid such as fumaric acid or maleic acid, a saturated polybasic acid such as phthalic anhydride, and a polyhydric alcohol such as ethylene glycol or propylene glycol. It is a resin. The unsaturated melamine resin is a prepolymer obtained by reacting melamine, formaldehyde and 2-hydroxyethyl (meth) acrylate. The vinyl ester resin is an epoxy (meth) acrylate resin obtained by reacting a bisphenol A type epoxy resin with (meth) acrylic acid.

These resins can use a common curing agent and a common curing accelerator, and can be copolymerized alone or in combination with each other to be copolymerized to obtain required physical properties such as hardness and light resistance. Accordingly, the composition and the compounding ratio can be appropriately selected.

Further, since the resin component is dissolved in the reactive monomer, it is not necessary to use a non-reactive volatile solvent, and when the composition is cured, about 100% becomes a solid component and a remarkable film thickness is obtained. There is no decrease. Since it does not contain a non-reactive solvent, the coating film can be coated with a synthetic resin film immediately after coating and cured in a closed state. The thickness of the coating film is 0.1
0.5 mm is preferable, and it is possible to form a coating film having this thickness by one application.

In the present invention, the liquid thermosetting resin composition containing no non-reactive solvent means that the resin component which is a solid or viscous substance has a viscosity suitable for the coating step. It means that it does not contain a non-reactive organic solvent necessary for dissolution, and it is necessary to improve the permeability and to evaporate and remove it at a weight ratio of 10% or less with respect to the thermosetting resin composition. It does not refer to the addition of unnecessary solvents.

A film made of polyethylene terephthalate, vinylon, polypropylene or the like is suitable as the synthetic resin film for coating the coating film of the thermosetting resin composition applied on the surface of the wood board, and the required makeup is required. The gloss level is 20 to 95 depending on the gloss level of the board.
A product that has been processed into a glossy or matte state in the range of ° is used. If necessary, it is also possible to add embosses having irregularities. When the glossiness is 20 or less or 95 or more, the stability of the glossiness of the film is poor and it is difficult to obtain a coating surface having a uniform glossiness. The glossiness is measured by the plastic optical characteristic test method specified in JIS K7105.

In use, these synthetic resin films are attached to a metal frame or the like in a tensioned state so as not to wrinkle or come loose, and placed on the surface to which the thermosetting resin composition is applied. While pressing with pinch rolls or hand rollers, bubbles displaced from the inside of the wood board and bubbles interposed between the film and the coating film are pushed out together with the excess resin liquid from the edge of the plate surface to remove bubbles, and then left. To cure. After the coating film is cured, the synthetic resin film is peeled off from the surface of the decorative plate to obtain a decorative plate-attached decorative plate.

[0021]

EXAMPLES All parts and% shown below represent parts by weight and% by weight. Example 1 A urea resin and a vinyl acetate emulsion were mixed in a weight ratio of 3: 7, and an adhesive containing 1% ammonium chloride was applied thereto using a spreader so that the coating amount was 120 g / m ^2. Then, place a sliced oak veneer veneer sliced to a thickness of 0.2 mm on it and insert it between the hot press hot plates, and clamp at temperature: 95 ° C, pressure 3 kgf / cm ² for 1 minute. Then, they were adhered to each other to obtain a laminated wood plate.

To the surface of the laminated wood plate, a 20% moisture-curable urethane prepolymer in toluene solution was applied with a brush, dried, and allowed to stand for 12 hours for curing, and then sanded according to JIS standard R6252. Lightly sanded with paper. Next, a resin solution, which is a thermosetting resin composition containing an unsaturated melamine resin and a vinyl ester resin as main components, having a compounding ratio shown in Table 1 was applied so as to have a coating amount of 150 / m ² , and A vinylon film with a thickness of 0.03 mm and a gloss of 95, which is attached to a steel frame, is placed on top of this vinylon film, and while holding this resin solution with a hand roller, stretch it with the excess resin solution. Bubbles are transferred to the edge of the plate and removed, and the surface of the coating film is leveled so that it is smooth, and then allowed to stand in a room at 25 ° C for 2 hours to cure the coating film, peel off the vinylon film, and evenly coat the surface. A decorative board with a lucky plate having a different coating layer was obtained. The lumber board-attached decorative board thus obtained had a smooth coating film surface, a deep and shiny texture, and was excellent in design. Table 1 shows the physical properties of the decorative board with the glazed board.

The unsaturated melamine resin is a melamine (meth) acrylate prepolymer obtained by reacting 1 mol of melamine, 6 mol of paraformaldehyde and 6 mol of 2-hydroxyethyl (meth) acrylate, and a vinyl ester resin. Is a resin obtained by dissolving bisphenol A type epoxy resin and methacrylic acid in a styrene monomer such that the bisphenol type epoxy acrylate is 55%.

Comparative Example 1 The same coating amount as in Example 1 was obtained by adding a curing agent and a curing accelerator to a commercially available unsaturated polyester resin for decorative veneer without applying an undercoating agent to a laminated veneer laminated board. 150 g / m ²
A decorative board-attached decorative board was manufactured in the same manner as in Example 1 except that the coating was applied as described above.

Comparative Example 2 A commercially available urethane-based undercoat paint for woodworking was diluted with a lacquer thinner to 40% on a Japanese oak board laminated plywood similar to that used in Example 1 and applied with a spray gun to give 30
After leaving it to stand at ℃ for 24 hours, it is dried and cured, and then the surface is AA24.
No. 0 sandpaper is used for polishing, then urethane topcoat paint for woodworking is applied and cured, then sanded with AA400 sandpaper, and further finish coating is performed using this paint to give a lusterboard-attached decorative plate. Obtained. Table 1 shows the physical properties of the decorative plywood on which the lumber board is attached in Comparative Examples 1 and 2.

Table 1

The test methods in Table 1 are as follows. Test method Pencil hardness test According to the pencil scratch test method specified in JIS K5400. Weather Resistance Test Iwasaki Electric Eye Super UV Tester SUV-W-13
Using a mold, ultraviolet irradiation for 10 hours-watering for 1 hour-resting for 1 hour is repeated as one cycle for 24 cycles. The glossiness and the color difference are based on the optical characteristic test method for plastics specified in JIS K7105. Cross-cut test According to the cross-cut test method specified in JIS K5400.

[0028]

According to the present invention, by applying an undercoating material to the surface of a wood board attached to a plate-shaped substrate,
Prevents the leaching of resin components contained in the wood board,
The adhesion of the coating film of the thermosetting resin composition applied thereafter to the surface of the scratched plate is enhanced, and it becomes possible to prevent the coating film from peeling off due to an impact or the like.

In addition, the thermosetting resin composition to be applied,
Since a non-reactive solvent for dissolving the resin is not included, a drying step for removing the solvent is not required, and the film thickness is not reduced by evaporation of the solvent. Therefore, it is possible to form a coating film having a required thickness as a decorative board by one-time application. Furthermore, since the coating film is covered and cured with a synthetic resin film stretched without slack, the surface of the coating film becomes smooth, and the synthetic resin film film does not need to include a matting agent in the resin liquid. By changing the glossiness of the surface, a decorative board having a desired glossiness can be obtained.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasunari Ogura 24, Fukami, Kamiwatsu, Jinmeji-cho, Kaifu-gun, Aichi Prefecture Aika Kogyo Co., Ltd.

Claims (5)

[Claims] 1. A glutinous board is attached to a platy base material using a thermosetting adhesive, and then a primer is applied to the gluing board surface, and a liquid containing no non-reactive solvent is applied thereon. A method for producing a decorative board with a sticky board, which comprises applying a thermosetting resin composition, coating the surface of the thermosetting resin composition coated with a synthetic resin film, and curing the composition. 2. The thickness of the wood board, which is attached to a plate-shaped base material using a thermosetting adhesive, is 0.07 to 2.0 mm.
The method for manufacturing a decorative board with a hardwood plate according to claim 1. 3. The undercoating agent applied to the surface of the wood board adhered to the plate-shaped substrate is composed of at least one kind of amino resin, epoxy resin, acrylic resin, polyurethane resin and silane coupling resin. The method for manufacturing a decorative board with a hardwood plate according to claim 1. 4. A component of a thermosetting resin composition containing no non-reactive solvent, which is applied after applying an undercoating agent to the surface of a wood board laminated to a plate-shaped substrate, is an unsaturated polyester resin, The method for producing a decorative board-coated decorative board according to claim 1, which contains at least one kind of a saturated melamine resin and a vinyl ester resin. 5. A synthetic resin film surface coated with a thermosetting resin composition applied to the surface of a wood board laminated to a wood board material is a surface having a flat surface or an uneven shape, and the glossiness of the synthetic resin film. Is 20 to 95 °. The method for producing a decorative board-attached decorative board according to claim 1.