JP2734879B2 - Manufacturing method of 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 decorative board used for furniture and interior materials, and more particularly, to a method for converting decorative paper into a substrate such as plywood or particle board using an electron beam-curable resin adhesive. When the product is pasted to
The present invention relates to a method for producing a decorative board having excellent adhesion between decorative paper and a substrate.

[0002]

2. Description of the Related Art Conventionally, vinyl acetate resin adhesives, ethylene / vinyl acetate resin adhesives, urea resin adhesives, etc. have been used for attaching decorative paper as a surface material of furniture or interior materials to a base material such as plywood or particle board. However, the production efficiency was not good because it required heating and pressurizing to remove water from the adhesive or to cure the adhesive, and required a subsequent curing period. Therefore, in order to improve production efficiency, an electron beam curing method using an electron beam curing type resin adhesive has been used as an alternative method.

However, when this electron beam curing method is used, when a conventional decorative paper is irradiated with an electron beam, a silicone resin or the like which is usually contained is deteriorated by the electron beam, particularly because the surface layer has adhesive tape resistance. In order to eliminate the effect, it has been found that, for example, when the adhesive tape on which a leaflet, a price tag, or the like is stuck on the surface of the product is peeled off, there is a disadvantage that the surface of the decorative paper is peeled off together.

[0004] In order to solve such inconveniences, an attempt was made to use resin-reinforced paper reinforced with a resin instead of building material paper used in conventional decorative paper. Although it was resolved to the extent that there was no problem, the adhesion between the decorative paper and the base material was poor this time, and it was bonded by peeling off the interface between the resin reinforced paper and the electron beam curable resin adhesive layer It has been found that a new disadvantage arises in that the decorative paper easily peels off from the substrate.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned conventional problems, and is intended to be bonded to a base material such as plywood or particle board by an electron beam curing method using an electron beam curing resin adhesive. Excellent adhesion between decorative paper and substrate,
It is an object of the present invention to provide a method for manufacturing a decorative board in which both are not separated.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a pattern printing layer and a top coat layer are sequentially provided on the surface side of a resin-reinforced paper reinforced with a hydrophilic resin between papers. When the back side of the decorative paper is bonded to the surface of a base material such as plywood or particle board, the electron beam curable resin adhesive having no hydrophilicity and the solvent having a hydroxyl group in the molecule coexist at the same time. It is characterized in that the whole is integrated by curing the electron beam-curable resin adhesive by irradiating a beam.

According to a second aspect of the present invention, there is provided a decorative paper in which a pattern printing layer and a top coat layer are sequentially provided on the front surface side of a resin-reinforced paper sheet-reinforced with a hydrophilic resin. When bonding to the surface of the material, an electron beam-curable resin adhesive having no hydrophilicity and a solvent having a hydroxyl group in the molecule are mixed and applied to the bonding surface in a dispersed state, and after bonding, the electron beam is applied. Irradiation cures the electron beam-curable resin adhesive, and the whole is integrated.

[0008] The invention according to claim 3 is to provide a decorative paper having a pattern printing layer and a top coat layer sequentially provided on the surface side of a resin-reinforced paper sheet-reinforced with a hydrophilic resin, and the back side of the decorative paper is provided with a base such as plywood or particle board. Upon bonding to the surface of the material, after applying a solvent having a hydroxyl group in the molecule to the back surface of the resin-reinforced paper, the decorative paper and the base material are laminated via an electron beam-curable resin adhesive having no hydrophilic property. Then, the electron beam is irradiated to cure the electron beam-curable resin adhesive, and the whole is integrated.

According to a fourth aspect of the present invention, there is provided a decorative paper in which a pattern printing layer and a top coat layer are sequentially provided on the front side of a resin-reinforced paper sheet-reinforced with a hydrophilic resin. Upon bonding to the surface of the material, after applying a solvent having a hydroxyl group in the molecule to the back surface of the resin-reinforced paper, a non-hydrophilic electron beam-curable resin adhesive and a solvent having a hydroxyl group in the molecule are mixed and dispersed. The decorative paper and the base material are overlapped with each other through the above-described state, and then the electron beam is irradiated to cure the electron beam-curable resin adhesive, and the whole is integrated.

According to a fifth aspect of the present invention, in the second or fourth aspect, water or ethylene glycol or a mixture thereof is used as a solvent having a hydroxyl group in a molecule in an amount of 3 parts per 100 parts of the electron beam-curable resin adhesive. It is characterized by being added, mixed and dispersed in a proportion of at least 20 parts or less.

The invention of claim 6 is characterized in that, in claim 3 or 4, any one of water, a lower alcohol, ethylene glycol or a mixture thereof is used as the solvent having a hydroxyl group in the molecule.

Hereinafter, the present invention will be described in more detail.

FIG. 1 is a sectional view showing the structure of a decorative board manufactured according to the present invention.

According to the structure shown in FIG. 1, a decorative board according to the present invention is a decorative paper 5 having a sealer layer 2, a picture print layer 3 and a top coat layer 4 in this order on a resin-reinforced paper 1 as a paper base. Is bonded to a substrate 7 such as a plywood or a particle board via an electron beam-curable resin adhesive layer 6.

The paper substrate used in the present invention has a basis weight of 20 g / m ² to
Resin-reinforced paper 1 reinforced with a hydrophilic resin of about 100 g / m ² between sheets. As a method of reinforcing the paper between sheets with a hydrophilic resin, specifically, a method of mixing a resin in a paper making process (resin mixed paper), a method of immersing paper in a resin solution and impregnating the resin (resin-impregnated paper) ), And in the present invention, resin-reinforced paper by any of these methods can be used. In addition, as a hydrophilic resin used for reinforcing between papers, a polyacrylamide resin, a melamine resin, a water-soluble acrylic resin, and the like are generally used.

The sealer layer 2 is provided as needed, and may be a urethane resin-based sealer, an amino resin-based sealer, or the like.

The thickness of the sealer layer 2 is not particularly limited, but is preferably about 1 to 5 μm. In providing the sealer layer 2, a known coating means such as a knife coat, an air coat, and a gravure coat can be optionally used.

The pattern printing layer 3 is formed by printing a desired pattern such as solid, wood grain, or an abstract pattern by a printing method such as gravure printing or screen printing.

For the top coat layer 4 of the present invention, an amino resin, a urethane resin, or the like is used. Of course, the resin is not limited to these resins, and other resins can be used according to the purpose. .

The top coat layer 4 can be formed by applying the above resin to a suitable viscosity with a diluent (for example, ethyl acetate, toluene, methyl isobutyl ketone, etc.) and applying this using a known coating means. Top coat layer 4
Is not particularly limited, but is 4 to 4 in the present invention.
About 20 μm is desirable.

The decorative paper 5 shown in FIG. 1 is an example of the configuration, and can be changed without impairing the effects of the present invention.

As shown in FIG. 1, the decorative paper 5 is bonded to a base material 7 such as a plywood or a particle board using an electron beam-curable resin adhesive 6, and then the adhesive is irradiated with an electron beam. The cured, integrated veneer of the present invention is formed.

In the present invention, an electron beam curing agent containing a solvent having a hydroxyl group in a molecule such as water, ethylene glycol, or a mixture thereof is used as an adhesive for bonding the decorative paper 5 and the base material 7 together. Use mold resin adhesive. Epoxy acrylate, urethane acrylate, or polyester acrylate resin alone is used as the electron beam-curable resin adhesive, and if necessary, a diluent monomer such as 1,6-hexanediol diacrylate (HDDA), diacrylate is used. Those diluted with propylene glycol diacrylate (DPGDA), tripropylene glycol diacrylate (TPGDA) or the like may be used.

The content of the solvent such as water and ethylene glycol contained in the electron beam-curable resin adhesive is at least 3 parts by weight, especially 4 to 20 parts by weight, per 100 parts by weight of the electron beam-curable resin adhesive. It is preferable to be within the range, and water, ethylene glycol and the like may be used alone or in combination. In the present invention, water, ethylene glycol, or the like is added to the above-mentioned electron beam-curable resin adhesive, which is appropriately stirred and dispersed, and then used as an emulsion.

The application amount of the electron beam-curable resin adhesive is as follows.
About 50 to 200 g / m ² is desirable. The application of the electron beam-curable resin adhesive may be applied to the back surface of the decorative paper 5 or the surface of the base material 7 or to both.

The decorative paper 5 and the base material 7 are bonded together by using an electron beam-curable resin adhesive containing a solvent having a hydroxyl group in a molecule such as water, ethylene glycol or a mixture thereof. That the decorative paper 5 is peeled off at the interface with the electron beam-curable resin adhesive layer 6 even when the resin-reinforced paper 1 is used as the base material of the decorative paper 5 as in the related art. Does not happen.

On the other hand, when the decorative paper 5 and the base material 7 are bonded together, water, lower alcohol, ethylene, etc. are applied to the back surface of the resin-reinforced paper 1 which is the base material of the decorative paper 5, that is, the surface bonded to the base material 7. Excellent adhesiveness can also be obtained by applying a solvent having a hydroxyl group in the molecule such as glycol and then bonding the decorative paper 5 and the base material 7 using an electron beam-curable resin adhesive. The electron beam-curable resin adhesive used at this time may or may not contain the above-mentioned water, ethylene glycol or the like.

Examples of the lower alcohol include methanol, ethanol, isopropanol, n-butanol and the like, and among them, methanol and ethanol are particularly preferred in the present invention.

Specific methods for applying a solvent such as water, lower alcohol, ethylene glycol or the like to the back side of the resin-reinforced paper 1 include a roll coating method (offset method, roll nip method, squeeze method, etc.), a spray coating method, and the like. The known coating means can be used.

Water, lower alcohol, ethylene glycol or the like may be used alone or as a mixture. For example, when water is used alone, the resin-reinforced paper 1 when the decorative paper 5 and the base material 7 are bonded to each other is used.
When the lower alcohol alone is used, the impregnation rate of the resin-reinforced paper 1 is about 2 to 10% when the lower alcohol is used alone, and when the ethylene glycol is used alone, the same is applied when the lower alcohol is used alone. It is desirable from the viewpoint of the effect of the present invention that water, a lower alcohol and ethylene glycol are respectively added so that the impregnation rate of the resin-reinforced paper 1 at the time of joining is about 15% or less. The above-mentioned water content (immersion) rate is a value obtained by the following equation.

[0031]

(Equation 1)

As described above, such a predetermined amount of water, lower alcohol, ethylene glycol, or the like is applied to the back surface of the resin-reinforced paper 1 and then the base paper 5 is bonded to the decorative paper 5 using an electron beam-curable resin adhesive. By bonding material 7
A decorative plate having excellent adhesion between the decorative paper 5 and the base material 7 is completed.

The bonding of the decorative paper 5 and the base material 7 can be performed continuously using a known device such as a roll laminator. The electron beam used to cure the electron beam-curable resin adhesive preferably has an acceleration voltage of 150 to 250 KV and an irradiation amount of about 3 to 8 Mrad.

[0034]

EXAMPLES The present invention will be described more specifically with reference to the following examples.

Example 1 Resin-reinforced paper of 30 g / m ² (A18S manufactured by Tenma Special Paper Co., Ltd.)
Was coated with a two-component curable urethane resin sealer (manufactured by Toyo Ink Mfg. Co., Ltd.) to form a urethane sealer layer having a thickness of 2 μm. On top of this, a 1 μm thick woodgrain print layer was formed by gravure printing using panel color ink (manufactured by Toyo Ink Mfg. Co., Ltd.), and a resin having the following composition was applied to a thickness of 6 μm to top coat. A layer was formed, and a decorative paper was obtained. Top coat layer composition Polyol resin 100 parts by weight Silicone additive 5 parts by weight Isocyanate type curing agent 40 parts by weight 40 parts by weight of 1: 1 mixed solvent of ethyl acetate and toluene

Next, 30 g / m ^{2 of} an electron beam-curable resin adhesive having the content shown in Table 1 below was applied to the surface of a 5 mm-thick particle board as a base material, and immediately obtained using a rubber roll. It was pasted on a decorative paper, passed through an electron beam irradiation device, and irradiated with an electron beam at an accelerating voltage of 200 KV and 4 Mrad to cure the adhesive, thereby obtaining decorative plates 1 to 11.

The surface of the decorative board thus obtained was cross-cut with a cutter, and its adhesion was evaluated according to the following criteria. The results are shown in Table 1. ◎ Completely integrated and decorative paper is not peeled at all ○ Decorative paper is slightly turned up when cutting △ Decorative paper is turned up a little, part of it remains on the base material due to delamination × Decorative paper with adhesive layer The film is completely peeled off between the above. If the evaluation criterion is △ or more, there is no practical problem and it can be used.

[0038]

[Table 1] From the results in Table 1, it is clear that the decorative board manufactured according to the present invention has excellent adhesiveness between the decorative paper and the substrate.

Example 2 A decorative paper was prepared in the same manner as in Example 1, and water, a lower alcohol and ethylene glycol were applied to the resin-reinforced paper on the back of the decorative paper using a rubber roll (as a result of the application). water, impregnation ratio see Table 2 of lower alcohols and ethylene glycol), which immediately electron beam curing resin adhesive to the surface (see Table 2) the bonding and particle board of thickness 5mm was 30 g / m ² coating This was irradiated with an electron beam in the same manner as in Example 1 to obtain decorative plates 12 to 26.

The decorative board thus obtained was evaluated for adhesion in the same manner as in Example 1, and the results are shown in Table 2.

[0041]

[Table 2] From the results in Table 2, it is clear that the decorative board manufactured according to the present invention has excellent adhesiveness.

[0042]

As described above in detail, according to the method for manufacturing a decorative board of the present invention, a decorative paper provided with a picture printing layer and a top coat layer on a resin-reinforced paper can be used as a plywood or particle board. In bonding to the base material, the adhesive is cured by irradiating an electron beam in a state where an electron beam-curable resin adhesive and a solvent having a hydroxyl group in a molecule are simultaneously present, for example, water, ethylene glycol and the like. Laminating using an electron beam-curable resin adhesive containing a solvent dispersed, or applying a solvent such as water, lower alcohol or ethylene glycol to the resin-reinforced paper on the back of the decorative paper, and then applying the electron beam-curable resin adhesive Adhesion during bonding is significantly improved, and stable production of decorative boards without decorative paper peeling from the substrate is realized. An excellent effect that it can be.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a decorative board manufactured according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin-reinforced paper 2 Sealer layer 3 Picture printing layer 4 Top coat layer 5 Decorative paper 6 Electron beam-curable resin adhesive layer 7 Base material such as particle board

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI E04C 2/12 E04C 2/12 E // B29L 9:00 (72) Inventor Hiroshi Nakanishi 1-5-1 Taito 1-chome, Taito-ku, Tokyo No. Toppan Printing Co., Ltd. (56) References JP-A-4-70336 (JP, A)

Claims (6)

(57) [Claims] 1. A decorative paper in which a picture print layer and a top coat layer are sequentially provided on the front side of a resin-reinforced paper reinforced with a hydrophilic resin between sheets, and the back side of the decorative paper is bonded to a base material surface such as a plywood or a particle board. At this time, the electron beam-curable resin adhesive having no hydrophilicity and the solvent having a hydroxyl group in the molecule are simultaneously irradiated with an electron beam in a coexistent state to cure the electron beam-curable resin adhesive, A method for manufacturing a decorative board, comprising: 2. A decorative paper in which a picture printing layer and a top coat layer are sequentially provided on the front side of a resin-reinforced paper reinforced with a hydrophilic resin between papers, and the back side of the decorative paper is bonded to the surface of a base material such as plywood or particle board. At this time, a non-hydrophilic electron beam-curable resin adhesive and a solvent having a hydroxyl group in the molecule are mixed and applied to the bonding surface in a dispersed state, and after bonding,
A method for manufacturing a decorative board, comprising irradiating an electron beam to cure the electron beam-curable resin adhesive and integrating the whole. 3. A decorative paper in which a pattern printing layer and a top coat layer are sequentially provided on the front side of a resin-reinforced paper reinforced with a hydrophilic resin between sheets, and the back side of the decorative paper is bonded to the surface of a base material such as plywood or particle board. At this time, after applying a solvent having a hydroxyl group in the molecule to the back surface of the resin-reinforced paper, the decorative paper and the base material are laminated via an electron beam-curable resin adhesive having no hydrophilicity, and then the electron beam is applied. A method for manufacturing a decorative board, comprising irradiating the resin to cure the electron beam-curable resin adhesive and integrating the whole. 4. A decorative paper in which a pattern printing layer and a top coat layer are sequentially provided on the front side of a resin-reinforced paper reinforced with a hydrophilic resin between paper sheets, and the back side of the decorative paper is bonded to the surface of a base material such as plywood or particle board. In this case, after applying a solvent having a hydroxyl group in the molecule to the back surface of the resin-reinforced paper, a mixture of an electron beam-curable resin adhesive having no hydrophilicity and a solvent having a hydroxyl group in the molecule, in a dispersed state, A method of manufacturing a decorative board, comprising: laminating the decorative paper and a base material through the intermediary, and then irradiating an electron beam to cure the electron beam-curable resin adhesive, thereby integrating the whole. 5. As a solvent having a hydroxyl group in a molecule, water, ethylene glycol, or a mixture thereof is added in a proportion of 3 parts or more and 20 parts or less based on 100 parts of an electron beam-curable resin adhesive. The method for producing a decorative board according to claim 2, wherein the decorative board is dispersed. 6. The method according to claim 3, wherein water, a lower alcohol, ethylene glycol or a mixture thereof is used as the solvent having a hydroxyl group in the molecule.