JPH0759626A - Decoarative laminated sheet - Google Patents

Abstract

PURPOSE:To easily and surely provide a decorative laminated sheet using a thin paper sheet excellent in various physical properties such as adhesion of a decorative resin layer and the like and also excellent in design respect. CONSTITUTION:An adhesive layer 3, a thin paper sheet 4 containing a transparent resin formed by a mixture of a curable urethan type polyester resin/cellulose derivative, a concealing solid layer 6, a pattern printing layer 7 and an ultraviolet ray curable resin layer 8 are provided in order on a substrate 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative board using thin paper printing paper, which has excellent adhesion to a decorative resin layer used as a surface material for wall materials, furniture and the like.

[0002]

2. Description of the Related Art Conventionally, as a decorative board used for the purpose of decoration or surface protection on the surface of a base material such as building materials and furniture, plywood, particle board, fiberboard and other substrates have a paper surface such as titanium paper or thin paper. It is known that a paper on which a picture pattern is printed is attached, and a thermosetting resin or a curable resin such as an ultraviolet curable resin is applied and cured on the paper.

However, those containing a titanium pigment have a hiding property,
Although it is excellent in impregnation property, it is inferior in smoothness of the surface, is too poor in printability due to too good ink absorption, is slightly inferior in finish and is poor in delicate design. Also, thin paper has good printability and finishes in a high design, but since the permeability of the surface resin is poor, the strength of the paper gap is low, and even if the paper strengthened at the stage of paper making is used, there is not much effect. However, there was a drawback that the cosmetic resin layer eventually peeled off.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide various physical properties such as adhesion of a decorative resin layer, and to improve designability. It also provides an excellent decorative board.

[0005]

In order to achieve the above object, the decorative board of the present invention has an adhesive layer, a thin paper layer, a concealing solid layer, a pattern printing layer, and a surface protective layer provided in this order on the substrate. The decorative sheet is characterized in that the thin paper layer is formed by coating and impregnating a thin paper with a two-component curable transparent resin composed of a mixture of urethane curable polyester resin / cellulose derivative from the concealing solid layer side.

The surface protective layer is made of an ultraviolet curable resin.

[0007]

In the present invention, a thin decorative paper is coated with and impregnated with a two-component curable transparent resin composed of a mixture of a urethane curable polyester resin / cellulose derivative, and a printed decorative paper provided with a concealing solid layer and a pattern printing layer. Since the surface protective layer is applied and cured after being bonded to the substrate via the adhesive, the adhesion of the decorative resin layer is excellent. Further, when the surface protective layer is an ultraviolet curable resin, the adhesion of the decorative resin layer is further improved.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the decorative board of the present invention. As shown in FIG. 1, the decorative plate 1 of the present invention is a substrate 2
The concealing solid layer 6 and the pattern printing layer 7 on the thin paper 4 impregnated with the two-component curable transparent resin 5 through the adhesive layer 3 on the surface of the
The printed decorative paper W provided with is laminated, and the ultraviolet curable resin 8 is laminated on the entire surface of the printed decorative paper W.

FIG. 2 is a sectional view showing an example of the manufacturing process of the decorative board of the present invention. As shown in FIG. 2 (a), in order to manufacture the decorative board 1 of the present invention, first, the two-component curing type transparent resin 5, the concealing solid layer 6, and the pattern printing layer 7 are gravure sequentially from the upper surface of the thin paper 4. It is continuously applied using a rotary press to create a printed decorative paper W. Next, as shown in FIG. 2B, the printed decorative paper W is overlaid and adhered onto the substrate 2 via the adhesive layer 3. Next, as shown in FIG. 3C, after the adhesive is cured, the UV curable resin 8 is applied over the entire surface of the printed decorative paper W, and then the patterning film 9 is laminated and irradiated with UV rays 10. After the ultraviolet curable resin 8 is hardened by curing, the shaped film 9 is peeled off to obtain the decorative plate 1 as shown in FIG.

As the substrate 2, a wood base material such as wood, plywood and particle board, a gypsum base material such as gypsum board and gypsum slag board, a pulp cement board, and an asbestos are provided in order to give a thickness and strength required for a decorative board. A fiber cement board such as a cement board, GRC and concrete, and a composite of each of the above substrates can be used.

As the base paper and thin paper 4 for the printed decorative paper W,
In order to allow the two-component curing type transparent resin liquid applied to the surface of the thin paper 4 to sufficiently penetrate, and to make the interlaminar strength of the decorative resin layer sufficient, the interlaminar strengthening treatment is not performed at the time of papermaking. Unsized paper is particularly good in terms of permeability.

The thin paper 4 has a thickness of 20
Preferably those to 40 g / m ^2, i.e. basis weight 20 g / m ²
When it becomes smaller (thinner), the two-component curing type transparent resin liquid escapes to the back surface, causing process troubles and poor adhesion with an adhesive used for bonding with a substrate. Further, when it becomes large (thickness) of 40 g / m ² or more, the penetration of the two-component curing type transparent resin liquid is small and the adhesion strength between the layers of the decorative resin is weak and the layers are separated. A basis weight of 25 to 35 g / m ² is suitable.

The two-component curable transparent resin 5 is composed of a mixture of urethane curable polyester resin and cellulose derivative, and the cellulose derivative is, for example, ethyl cellulose, cellulose nitrate, cellulose acetate, ethyl hydroxycellulose, cellulose acetate propionate. Etc. Further, as the curing agent isocyanate for the urethane-curable unsaturated polyester resin, a divalent or higher valent aliphatic or aromatic isocyanate can be used, but the aliphatic isocyanate is preferable from the viewpoint of thermal discoloration prevention and weather resistance.
Specific examples include tolylene diisocyanate, xylene diisocyanate, and 4,4-diphenylmethane diisocyanate. The solid content weight ratio of the urethane curable polyester resin and the cellulose derivative is preferably (80/20 to 60/40), and particularly preferably 65/35. Further, it is suitable to mix the solid content in the paint to be about 30 to 50% by weight. The coating amount is preferably 4 to 10 g / m ² .

Next, as an ink used for forming the concealing solid layer 6 and the pattern printing layer 7, a vehicle may be used, if necessary.
A colorant such as a pigment or a dye, an extender pigment, a solvent, a stabilizer, a plasticizer, a catalyst, a curing agent, and the like are appropriately mixed and used. Here, as the vehicle, a two-component curable transparent resin composed of a mixture of a urethane-curable polyester resin and a cellulose derivative similar to the two-component curable transparent resin 5 is preferable for the concealing solid ink from the viewpoint of adhesion, Further, for pattern printing, linseed oil, fats and oils such as soybean oil, rosin, rosin ester, or natural resin such as polymerized rosin, maleic acid resin, alkyd resin, vinyl resin, acrylic resin,
Examples include synthetic resins such as polyamide resins and epoxy resins, and fibrin derivatives such as nitrocellulose and ethyl cellulose. Among these, applications, necessary physical properties,
It is appropriately selected according to printability and the like. This concealed solid layer 6,
The pattern print layer 7 is also formed by the gravure printing method at the same time as the application of the transparent resin layer.

As the adhesive 3 used for adhering the substrate 2 and the printed decorative paper W, an emulsion type synthetic resin composed of a mixture of vinyl acetate resin or vinyl acetate resin modified with acrylic ester and ethylene, and urea resin is used. It is a resin adhesive and is bonded using a device such as a hot press or a laminator.

Among the curable resins forming the surface protective layer, there are polyester resin, melamine resin and the like as the thermosetting resin layer, but the cause is not clear, but the adhesion is not so good, and the curing for forming the surface protective layer. The ultraviolet curable resin is excellent as the functional resin layer. The UV curable resin 8 may be a commonly used one, for example, an epoxy acrylate, urethane acrylate, acrylic modified polyester or the like is used as an oligomer, and a neopentyl glycol acrylate is added to the UV curable resin 8 for the purpose of adjusting the cross-linking structure and the viscosity. A compound obtained by mixing a monomer such as trimethylolpropane triacrylate and adding a polymerization initiator thereto is used.

The thickness of the surface protective layer is suitably in the range of 10 to 200 μm. The application of the resin for forming the top coat layer, the lamination of the shaping film, and the irradiation of ultraviolet rays may be performed according to known methods. Flow coating, knife coating, spray coating and the like are usually used as the coating means. A mercury lamp, a black light lamp, a carbon arc lamp or the like is usually used as the ultraviolet ray source.

The shape-imparting film 9 is a commonly used film, for example, a film of polyester, polypropylene or the like having a highly smooth surface, a matte surface, a matte texture, a satin texture, a conduit groove of a wood grain board, etc. It is possible to use a product having an uneven surface that has been embossed or subjected to raised printing. If necessary, a release agent layer made of fluororesin, silicone resin, wax or the like may be provided on the shaping surface side.

The present invention will be described in more detail with reference to specific examples. Was applied by gravure printing solid plate at a coverage of Example 1 weighed 30 g / 2 solution to ordinary tissue paper as a primer for m ² urethane curable polyester resin / cellulose derivative-based resin solution 6 g / m ² (wet), followed by In the same way, a concealing solid layer was printed with the same two-component urethane curable polyester resin / cellulose derivative type colored solid ink and a wood grain pattern was printed with nitrified cotton type ink. Then, it was laminated on a 2.5 mm-thick medium quality fiberboard using a polyvinyl acetate-vinyl chloride copolymer adhesive. An ultraviolet curable resin having a thickness of 10 is formed on the printed surface of the laminate.
It was coated with a flow coater to 0 μm. Then, the matte surface of the polyester matte film is laid on the uncured UV-curable resin-coated surface, and 10 m / m of the irradiation device is equipped with four 80 w / cm ozoneless mercury lamps from the film side.
After passing through at a speed of min to completely cure the ultraviolet curable resin layer, the matted film was peeled off to manufacture a decorative board. The matted film may be peeled off during processing after it is used as a decorative sheet surface protection film.

Comparative Example 1 An acrylic resin liquid was applied as an undercoat to a paper-reinforced thin paper having a basis weight of 30 g / m ² at a coating amount of 6 g / m ² (wet) by a gravure printing solid plate, and thereafter the same as in Example 1. A decorative board was obtained by various methods.

Then, the adhesiveness of the decorative boards obtained in the above Examples and Comparative Examples was evaluated by each test method of a goosenose cellophane tape test and a goosenose gum tape test. (1) Gougin Cellophane Tape Test 100 Gougin cells that reach the substrate at 1 mm intervals were made with a cutter knife, and cellophane adhesive tape (Nichiban: cellophane tape) was pressure-bonded on the surface. After that, the film is rapidly peeled off and the number of remaining coating films is counted.

(2) Gougin eye gum tape test 100 pieces of gougin eyes that reach the substrate at 1 mm intervals were made with a cutter knife, and a gum tape (made by Sekisui Chemical Co., Ltd .: vinyl cloth tape) was pressure-bonded to the surface. After that, the film is rapidly peeled off and the number of remaining coating films is counted.

[0023]

[Table 1]

As a result, as shown in Table 1, in Comparative Example 1, the remaining number was 50 or less in both the goosenose cellophane tape test and the goosenose gum tape test, and in both cases, the adhesion performance of the decorative resin layer was insufficient. It means that you are doing.

On the other hand, in the first embodiment according to the present invention,
In both the goosenose cellulosic tape test and the goosenose gum tape test, the number of remaining films was 97 or more, almost no peeling was observed, and it was possible to obtain a decorative board having a decorative resin layer having excellent adhesiveness.

[0026]

As described above, the decorative board of the present invention is obtained by coating and impregnating the urethane curable polyester resin / cellulose derivative mixed resin before applying the concealing solid layer and the pattern printing layer on the thin paper. Since it is a decorative plate that is bonded to the base material via an adhesive and coated with an ultraviolet curable resin on it, the paper-to-paper strength is significantly improved and the disadvantages of conventional decorative plates in terms of design are also eliminated. This makes it possible to manufacture high-quality decorative boards.

[0027] As a base paper for printing decorative paper, a thin paper of non-sized paper without inter-paper reinforcement is used, and an undercoat application for inter-paper reinforcement is produced inline with a concealing solid layer and a pattern printing layer in a gravure printing machine. Therefore, the manufacturing cost can be reduced significantly.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a decorative board of the present invention.

FIG. 2 is a cross-sectional view showing an example of the manufacturing process of the decorative board of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Decorative plate 2 Substrate 3 Adhesive layer 4 Thin paper 5 Two-component curable transparent resin 6 Concealing solid layer 7 Picture printing layer 8 UV curable resin layer 9 Adhesive film 10 UV W Decorative paper for printing

Claims (2)

[Claims] 1. A decorative board in which an adhesive layer, a thin paper layer, a concealing solid layer, a pattern printing layer, and a surface protective layer are provided in this order on a substrate, wherein the thin paper layer is a thin paper and the urethane curing type from the concealing solid layer side. A decorative board characterized by being formed by coating and impregnating a two-component curing type transparent resin composed of a mixture of polyester resin / cellulose derivative. 2. The decorative board according to claim 1, wherein the surface protective layer is made of an ultraviolet curable resin.