JP3381616B2 - Surface finishing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface finishing method for a wood-based material used for bathroom walls, indoor storage, various doors, etc., using a hot-melt adhesive and a surface-finishing film. This is a surface finishing method that reduces the amount used and improves the working environment.

[0002]

2. Description of the Related Art Conventionally, in order to improve the performance such as weather resistance and water resistance of a wood-based base material and to improve the aesthetic appearance, surface finishing by painting has been performed. In general,
For the coating, a paint prepared by dissolving a resin such as an acrylic resin or a urethane resin in an organic solvent is applied to the surface of the wood-based substrate by spraying, and then dried to volatilize the organic solvent and apply it. It is carried out by a method of forming a film.

[0003]

However, in the method of applying a paint by using this spray to form a coating film, the resin forming the coating film at the time of application is scattered to other than the surface to be coated, resulting in loss. There was a large amount of the resin that became a problem. In addition, since a large amount of organic solvent is volatilized in the air to form a coating film, the working environment is bad and has been a problem.
Furthermore, since uneven coating is likely to occur during application work,
There is a problem that color unevenness is likely to occur and the coating film thickness is likely to be uneven.

The present invention has been made in view of the above circumstances, and provides a surface finishing method capable of reducing the amount of resin used, improving the working environment, and obtaining a uniform coating film. It is an issue.

[0005]

[Means for Solving the Problems] The above-mentioned problems are obtained by applying an isocyanate-based primer to the surface of a wood-based substrate,
Polyamide resin, saponified product of ethylene-vinyl acetate copolymer or its graft product, ethylene-vinyl acetate copolymer, polyvinyl chloride coated with a hot-melt adhesive consisting of polycarboxylic anhydride , acrylic resin, polyolefin
Transparent or semi-transparent made of either reffin resin
It can be solved by a surface finishing method which is characterized in that the surface finishing film of (1) is placed, and these are heated and pressed. Further, after applying an isocyanate-based primer on the surface of the wood-based substrate, a film-shaped polyamide resin, saponified ethylene-vinyl acetate copolymer or a grafted product thereof, ethylene-vinyl acetate copolymer, anhydrous Hot melt adhesive consisting of polycarboxylic acid and poly salt
Vinyl chloride, acrylic resin, polyolefin resin
The problem can be solved by a surface finishing method characterized by placing a transparent or translucent surface finishing film having a gap and heating and pressing these.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below.
The wood-based base material in the present invention includes wood-based plywood such as particle board, medium density fiberboard (MDF), and lauan plywood, or a wood-made decorative veneer laminated on the surface of a steel plate, aluminum plate, glass plate or the like. , Solid wood, foam resin plate, aluminum plate, steel plate on both sides,
One of them has a wooden decorative veneer laminated on one surface.

As the isocyanate-based primer used here, for example, one having a polyisocyanate composed of diisocyanate and polyol as a main component is preferably used. Further, as this isocyanate-based primer, the above-mentioned isocyanate-based primer,
Those in which a coloring agent is added to the extent that the surface decoration of the wood-based substrate is not impaired, and those in which a solvent is added for adjusting the viscosity are also preferably used.

As the surface finish film here, for example, a transparent or translucent film made of a resin such as polyvinyl chloride, acrylic resin, or polyolefin resin can be used, and the thickness thereof is 50 μm to 150 μm.
Those of are preferably used. Further, when the surface finishing film is placed on the wood-based material, a material in which the grain of the wood-based material is colored to the extent that it can be visually confirmed is also suitably used. Further, a transparent or semi-transparent material having a wood grain or the like on which the wood grain of the wood-based base material is further enhanced is preferably used.

As the hot melt adhesive used for adhering such a surface finish film, polyamide resins, saponified products of ethylene-vinyl acetate copolymers or graft products thereof, ethylene-vinyl acetate copolymers, polycarboxylic anhydrides are used. It is possible to use, for example, 10 to 80% by weight of polyamide resin and ethylene-vinyl acetate copolymer (ethylene content of 40% by weight).
~ 80 wt%, vinyl acetate content 60 ~ 20 wt% saponified product or its grafted product (saponification rate is about 30 ~).
100%) 90 to 20% by weight, ethylene-vinyl acetate copolymer (ethylene content 40 to 80% by weight, vinyl acetate content 60 to 20% by weight) 0 to 80% by weight, polycarboxylic acid anhydride 0.1 to 10% by weight And the like are preferably used.

The polyamide resin used in this hot melt adhesive includes dimer acid which is a dimer of fatty acids such as soybean oil, tung oil and tall oil, and ethylenediamine,
Examples thereof include polymers obtained by the reaction with diamines such as diethylenetriamine. Among them, the polyamide resin preferably used has an amine value of 3 to 30,
The viscosity is 3000 (cps / 200 ° C.) or more, more preferably 3000 to 15000 (cps / 200 ° C.), or the softening point is 130 ° C. or more, preferably 130 to 250 ° C. Specifically, for example, Tomade TXC232C (trade name manufactured by Fuji Kasei Kogyo Co., Ltd.), Sunmide HT-140PK-20 (trade name of Sanwa Chemical Industry Co., Ltd.), Evergrip PA-79BT (trade name of ACI Japan Co., Ltd.) , New Maid 30
008 (Harima Chemicals Co., Ltd. product name) and the like.

The saponified product of the ethylene-vinyl acetate copolymer or the graft product thereof has an ethylene content of 40.
It is a product obtained by saponifying or grafting an ethylene-vinyl acetate copolymer having a content of -80% by weight and a vinyl acetate content of 60-20% by weight by a known method. A saponified ethylene-vinyl acetate-vinyl alcohol terpolymer or a graft product thereof is used. In addition, the saponified product of these ethylene-vinyl acetate copolymers or the grafted product thereof usually has a melt flow index (MI: JISK6760, 1996) of 200 g /
10 min. The following are preferably used. Specifically, for example, Technolink (registered trademark of partially saponified ethylene-vinyl acetate copolymer manufactured by Taoka Chemical Co., Ltd.)
R-100, R-200, R-300, R-40
And R-4001, or Sumilink (registered trademark of a saponified product of an ethylene-vinyl acetate copolymer manufactured by Sumitomo Chemical Co., Ltd.) DR-55, DR-150, and the like.

As the ethylene-vinyl acetate copolymer used here, an ethylene-vinyl acetate copolymer having an ethylene content of 40 to 80% by weight and a vinyl acetate content of 60 to 20% by weight is used. In addition, these ethylene-vinyl acetate copolymers usually have a melt flow index (MI: JIS K6760, 199).
6) is 150 g / 10 min. The following are preferably used. Specifically, for example, Sumitate (registered trademark of ethylene-vinyl acetate copolymer manufactured by Sumitomo Chemical Co., Ltd.) KA-10, KA-20, KA-31, and K.
A-41, MB-11, RB-11, and the like.

As the polycarboxylic acid anhydride used herein, aliphatic or aromatic ones can be used. For example, trimellitic acid anhydride, pyromellitic acid anhydride, trimellitic acid anhydride or pyromellitic acid anhydride can be used. Diester of meritic acid and ethylene glycol or triester of glycerin, 3,3 ′, 4,4′-benzophenone tetracarboxylic acid anhydride, styrene-maleic anhydride copolymer, ethylene-maleic anhydride copolymer , Methyl vinyl ether-maleic anhydride copolymer, and the like. Specific examples thereof include RIKACID TMEG (trade name of ethylene glycol bis (anhydrotrimellitate) manufactured by Shin Nippon Rika Co., Ltd.).

As the hot-melt adhesive, those to which a coloring agent is added to the extent that the surface decoration of the wood-based substrate is not impaired are also preferably used.

An example of the surface finishing method of the present invention is shown in FIGS.
This will be described with reference to FIG. In FIG. 1, reference numeral 1 is a wooden base material. The wooden base 1 is polished with sandpaper or the like so that the surface to be finished is smooth. Then, as shown in FIG. 2, the isocyanate-based primer 2 is applied to the surface of the polished wood-based substrate 1 using a brush or a spray, and dried in air or the like. Further, in FIG. 3, reference numeral 3 is a surface finish film. A hot melt adhesive 4 is applied to the surface finish film 3 as shown in FIG. And
As shown in FIG. 5, a surface finish film 3 having a hot-melt adhesive 4 applied on a wood-based base material 1 having an isocyanate-based primer 2 applied thereto, It is carried out by placing them so as to be in contact with each other and heating and pressing them to bond them to form a finishing layer on the surface of the wood-based substrate 1.

In this surface finishing method, heating and pressurization are
It is performed using a hot press or a heating roll. On this occasion,
The heating temperature and the pressure to be applied are appropriately set depending on the type of the surface finish film 3 and the wood-based material 1. The wood-based base material 1 having the finishing layer formed on the surface thus obtained is processed into a predetermined size by processing the unpressurized portion of the end portion by cutting or the like and processing the product into a predetermined size.

According to this surface finishing method, after applying the isocyanate primer 2 on the surface of the wood-based substrate 1, the surface finishing film 3 coated with the hot melt adhesive 4 is placed, and the surface is heated and pressed. Since it is a finishing method, the resin that forms the coating film does not scatter, unlike the case of painting using a spray, so the amount of resin that is lost is small, and the amount of resin used can be reduced. Become. Also, by bonding the surface finish film 3,
Since it is a method of forming a finishing layer on the surface of the wood-based substrate 1, it is not necessary to scatter a large amount of organic solvent into the air to form a coating film, and the working environment can be improved.
In addition, it is a method by which a uniform finishing layer can be obtained.

Furthermore, by adding a colorant to the isocyanate-based primer 2 or the hot-melt adhesive 4 or coloring the surface-finishing film 3, the surface-decorating property of the wood-based substrate 1 is not impaired. By coloring or using a printed surface finish film 3 as the surface finish film 3, while utilizing the texture of the wood-based substrate 1, it is possible to support various designs and colors, It is a surface finishing method that can improve aesthetics.

The hot-melt adhesive 4 used in this surface finishing method comprises a polyamide resin, a saponified product of an ethylene-vinyl acetate copolymer or a graft product thereof, an ethylene-vinyl acetate copolymer, and a polycarboxylic acid anhydride. By using, it is possible to obtain a finishing layer having excellent adhesive strength with the surface of the wood-based substrate 1.

As another example of the surface finishing method of the present invention, as shown in FIG. 2, an isocyanate primer 2 is applied onto a wood-based substrate 1, and then, as shown in FIG.
Place the film-shaped hot melt adhesive 4, and then
As shown in FIG. 5, the surface finishing film 3 is placed,
There is a method in which these are heated and pressed to bond them, and a finishing layer is formed on the surface of the wood-based substrate 1. The heating and pressurization in this example are performed using a hot press or a heating roll, as in the above example. In addition, the wood-based substrate 1 having a finishing layer formed on the surface thus obtained
In the same manner as the above example, the unpressurized portion of the end is processed by cutting or the like, and processed into a predetermined size to obtain a product.

The difference in this surface finishing method from the above-mentioned example is that a film-shaped hot melt adhesive 4 is used as the hot melt adhesive 4, and the wood base material 1 coated with the isocyanate primer 2 is used. That is, the surface finish film 3 was placed on the surface and then, as shown in FIG.

In this surface finishing method, an isocyanate primer 2 is applied to the surface of a wood-based substrate 1, a film-shaped hot melt adhesive 4 and a surface finishing film 3 are placed thereon, and these are heated. Since it is a surface finishing method of applying pressure, it is not necessary to apply the hot-melt adhesive 4 to the surface-finishing film 3, so that it can be easily manufactured and there is no loss of the hot-melt adhesive 4 due to application. Therefore, the method can reduce the amount of the hot melt adhesive 4 used. Further, since the thickness of the hot melt adhesive 4 becomes uniform, the adhesive strength of the finishing layer becomes uniform.

In this surface finishing method, a hot melt adhesive 4 comprising a polyamide resin, a saponified product of an ethylene-vinyl acetate copolymer or a graft product thereof, an ethylene-vinyl acetate copolymer, and a polycarboxylic anhydride is used. By using it, the film-shaped hot melt adhesive 4 can be easily obtained, and the finishing layer having excellent adhesive strength can be obtained.

Although such a surface finishing method can be used as a method for forming a finishing layer composed of one surface finishing film 3 as in the above-mentioned example, it comprises a plurality of surface finishing films 3. It can also be applied to a method of forming a finishing layer. In addition, a finishing layer is formed on the wood-based material 1 by using the surface finishing film 3 having a size capable of covering the small portion of the wood-based material 1, and then the edge of the wood-based material 1 is formed. It is possible to use it as a method of forming a finishing layer also on the small portion of the wood-based substrate 1 by winding the unpressurized surface finishing film 3 in the small portion on the small portion, heating, pressurizing and adhering. Furthermore, by a conventional method such as painting, on the surface finish film 3,
A coating film may be formed.

[0025]

EXAMPLES The present invention will be described in detail below with reference to examples. As shown in FIG. 5, the surface of the wooden base material 1 was finished. That is, as the wood-based base material 1, a plywood surface laminated with a wood decorative veneer is used, and sandpaper or the like is used so that the finished surface of the wood-based base material 1 is smooth. Polishing is performed, and the isocyanate-based primer 2 is applied to the polished surface with a sprayer so as to have a thickness of 5 μm, and dried in air or the like, and a saponified product of polyamide resin and ethylene-vinyl acetate copolymer is used. , A hot-melt adhesive 4 composed of ethylene-vinyl acetate copolymer and polycarboxylic acid anhydride was applied so as to have a thickness of 40 μm, and a transparent surface-finishing film 3 having a thickness of 130 μm made of vinyl chloride resin was placed thereon. A heating roll was used to heat and pressurize the surface at a temperature of 110 ° C., a pressure of 6 kg / cm, and a speed of 5 m / min to finish the surface.

As a result, it can be confirmed that by finishing the surface of the wood-based base material 1 by this surface finishing method, a finishing layer having the same appearance and texture as the coating film finished by the conventional coating method can be obtained. It was

[0027]

As described above, according to the surface finishing method of the present invention, the surface of the wood base material is coated with the isocyanate primer, and then the surface finish film coated with the hot melt adhesive is placed thereon. Because it is a surface finishing method that heats and pressurizes, the resin that forms the coating film does not scatter, as when painting using a spray,
The surface finishing method can use a small amount of resin. Also, because it is a method of finishing the surface of the wood-based substrate by adhering a surface finishing film, it is not necessary to scatter a large amount of organic solvent in the air to form a coating film, improving the working environment. And a surface finishing method capable of obtaining a uniform finishing layer.

Further, a surface finishing method in which an isocyanate-based primer is applied to the surface of a wood-based substrate, a film-like hot-melt adhesive and a surface-finishing film are placed thereon, and these are heated and pressed. Therefore, since it is not necessary to apply the hot melt adhesive to the surface finish film, it can be easily manufactured, and since there is no loss of the hot melt adhesive due to the application, the amount of the hot melt adhesive used can be reduced. The surface finishing method can be reduced. Furthermore, since the thickness of the hot melt adhesive is uniform, a surface finishing method can be obtained in which a finishing layer having uniform adhesive strength with the wood-based substrate can be obtained.

Furthermore, the hot melt adhesive used in this surface finishing method comprises polyamide resin, saponified product of ethylene-vinyl acetate copolymer or its graft product, ethylene-vinyl acetate copolymer, polycarboxylic anhydride. By using, it is possible to easily obtain a hot melt adhesive in the form of a film, and to obtain a finishing layer having excellent adhesive strength with the surface of the wood-based substrate.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a wood-based material used in the present invention.

FIG. 2 is a schematic cross-sectional view showing a state of a wood-based base material coated with an isocyanate-based primer in the surface finishing method of the present invention.

FIG. 3 is a schematic cross-sectional view showing an example of a surface finish film used in the present invention.

FIG. 4 is a schematic cross-sectional view showing a state of a surface finish film coated with a hot melt adhesive in the surface finish method of the present invention.

FIG. 5 is a cross-sectional view showing an example of a wood-based substrate that has been finished by the surface finishing method of the present invention.

FIG. 6 is a schematic cross-sectional view showing a state where a hot-melt adhesive is placed on a wood-based base material coated with an isocyanate-based primer in the surface finishing method of the present invention.

[Explanation of symbols]

1 ... Wood base material, 2 ... Isocyanate primer, 3 ... Surface finishing film, 4 ... Hot melt adhesive

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI B29L 31:10 B29L 31:10 (56) References JP-A-7-137424 (JP, A) JP-A-7-52305 (JP , A) JP-A-8-323715 (JP, A) JP-A-6-143497 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04F 13/08-13/18 B32B 1/00-35/00

Claims (2)

(57) [Claims] 1. A surface of a wood-based substrate is coated with an isocyanate-based primer and then a polyamide resin, ethylene-
Polyvinyl chloride coated with a hot melt adhesive consisting of a saponified product of vinyl acetate copolymer or its graft product, ethylene-vinyl acetate copolymer, and polycarboxylic acid anhydride.
Any of acrylic resin, acrylic resin, polyolefin resin
A surface finishing method comprising placing a transparent or semi-transparent surface finishing film consisting of and heating and pressing these. 2. A surface of a wood-based substrate is coated with an isocyanate-based primer, and then a film-shaped polyamide resin, a saponified product of an ethylene-vinyl acetate copolymer or a grafted product thereof, an ethylene-vinyl acetate copolymer is used. Hot melt adhesive consisting of coalesced and polycarboxylic anhydride , polyvinyl chloride, acrylic resin, polyolefin
A surface finishing method comprising placing a transparent or semi-transparent surface finishing film made of any of a series of resins, and heating and pressing the films.