JPH07117183A - Composite decorative sheet and method for manufacturing the same - Google Patents

Abstract

(57) [Summary] [Purpose] A composite decorative sheet with a polyvinyl chloride resin laminated on the surface of a paper base material, which enhances the adhesion strength between the paper base material and polyvinyl chloride and imparts embossing suitability. At the same time, it provides thermal stability and suppresses the occurrence of expansion and contraction. [Structure] First of two-component curing type urethane resin on the paper base layer 1
An adhesive layer 2, a printing layer 3 printed with a printing ink obtained by adding an isocyanate resin to a nitrocellulose ink, a second adhesive layer 4 obtained by adding an isocyanate resin as a curing agent to a vinyl chloride resin, and a transparent layer. Alternatively, a composite decorative sheet in which a translucent polyvinyl chloride clear layer 5 is laminated in this order and a method for producing the same.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite decorative sheet for use as a decorative sheet laminated on the surface of interior wall materials, door materials, and other furniture materials, and a method for producing the same.

[0002]

2. Description of the Related Art As a conventional composite decorative sheet, a decorative printed pattern such as a wood grain pattern is appropriately applied on a paper base material such as titanium paper,
There was a sheet obtained by coating a vinyl chloride paste on the printed pattern, or a sheet obtained by laminating thin paper and a vinyl chloride film.

Such a composite decorative sheet was excellent in dimensional stability, but on the other hand, the adhesion strength (adhesion strength) between vinyl chloride and paper was not obtained.

As another composite decorative sheet, for example, a printed pattern for makeup such as a wood grain pattern is appropriately printed on a polyvinyl chloride film, and a polyvinyl chloride film is laminated and laminated as a top coat on the printed pattern. There is a composite decorative sheet worn.

[0005]

However, although the above composite decorative sheet is excellent in embossing, V-cut suitability, adhesion strength, etc., it is poor in heat resistance and thermal dimensional stability, so that the pattern of the lower handle and the embossing can be estimated. It was difficult to match.

According to the present invention, a composite decorative sheet comprising a paper base material and a polyvinyl chloride resin laminated on the surface thereof is provided with embossing suitability, good thermal stability, and suppression of expansion and contraction. Especially.

[0007]

According to the present invention, printing is performed with a first adhesive layer 2 of a two-component curing type urethane resin on a paper base layer 1 and a printing ink obtained by adding an isocyanate type resin to a nitrocellulose type ink. Printed layer 3 and a second vinyl chloride resin containing an isocyanate resin as a curing agent
A composite decorative sheet comprising an adhesive layer 4 and a transparent or translucent polyvinyl chloride clear layer 5 laminated in this order.

Further, according to the present invention, a two-component curing type urethane resin is applied on a sheet-like paper base material layer 1 such as thin paper or titanium paper to provide a first adhesive layer 2 and then the first adhesive layer. A nitrocellulose-based ink containing an isocyanate-based resin is printed on the agent layer 2 in one or several colors to form a printing layer 3, and a vinyl chloride-based resin mixed with an isocyanate-based resin is applied as a curing agent on the printing layer 3. Then, a second adhesive layer 4 is provided, and a transparent or semi-transparent polyvinyl chloride resin is applied onto the second adhesive layer 4 to provide a clear layer 5. is there.

[0009]

EXAMPLE A composite decorative sheet of the present invention is shown in FIG.
According to the embodiment of FIG. 1C, it will be described in detail with reference to FIG.
On a sheet-shaped paper base material 1 such as thin paper or titanium paper, a two-component curing type urethane resin (alkyd resin, acrylic resin, or hydroxyl group (-O
A first adhesive layer 2 made of (H) and a resin that is cured by a crosslinking reaction between an isocyanate group (—NCO) of an isocyanate resin as a curing agent (crosslinking agent) is laminated.

On the first adhesive layer 2, 5 to 20 parts by weight (preferably 10 to 14 parts by weight) of an isocyanate resin or a resin mainly containing an isocyanate resin is added to a nitrocellulose-based gravure printing ink. A printing layer 3 (one color or a plurality of colors) such as a wood grain pattern printed with gravure printing ink is provided.

On the printed layer 3, there is provided a second adhesive layer 4 made of a resin obtained by adding 3 to 15 parts by weight of an isocyanate resin to a vinyl chloride resin or a polyvinyl chloride resin mainly containing vinyl chloride resin. ing. The polyvinyl chloride resin is a mixture of polyvinyl chloride resin and a resin having active hydrogen, for example, a resin having a hydroxyl group (-OH). For example, an alkyd resin having a hydroxyl group (-OH), It is a mixture of acrylic resins or resins such as nitrocellulose and polyvinyl alcohol.

A transparent or semitransparent polyvinyl chloride clear layer 5 (uncolored or colored) is provided on the second adhesive layer 4, and the polyvinyl chloride clear layer 5 is provided.
A plasticizer is added to the resin, and it is appropriate that a polyol plasticizer such as polyester is added as the plasticizer.

As shown in FIG. 1 (b), the surface of the clear layer 5 made of polyvinyl chloride is provided with an embossed pattern 6 of an appropriate shape formed by hot pressing with an embossing die. Alternatively, for example, an embossed pattern 6 that is synchronized with the print pattern of the print layer 3 may be provided.

Further, as shown in FIG. 1C, a transparent or semitransparent topcoat layer 7 (uncolored or colored) may be laminated on the clear layer 5 if necessary. Of course, for example, the top coat layer 7 using a urethane resin is applied.

Next, the method for producing the composite decorative sheet of the present invention will be described in detail below with reference to examples. First, basis weight 20 to 50 g / m ² or 50~140g / m a paper substrate using a ^second thin paper or titanium paper, a urethane adhesive of a two liquid curing type, coating amount 1 g / m ² to 1. 5 g / m
² (dry) is applied to form the first adhesive layer 2.

Next, after the first adhesive layer 2 is reacted and cured for an appropriate period of time, it is introduced into a gravure rotary printing machine to appropriately produce a gravure printing plate on which a printing pattern such as a wood grain pattern is prepared, and a nitrocellulose-based printing plate. The first adhesive layer 2 is formed by using a gravure printing ink (solvent volatilization type) to which 5 to 20 parts by weight (preferably 10 to 14 parts by weight) of an isocyanate resin or a resin mainly containing an isocyanate resin is added. A printed pattern such as a wood grain pattern is printed on the printed layer to form the printed layer 3, and the printed printed layer 3 is introduced into a drying device to evaporate the solvent component and to be dried.

Next, on the printed layer 3, a vinyl chloride resin or a resin mainly composed of a vinyl chloride resin is added with a hydroxyl group (-
OH) -containing alkyd resin, acrylic resin, polyvinyl alcohol, or other resin in an amount of 3 to 15 parts by weight, and an isocyanate group (-NCO) that cross-links therewith.
The second adhesive layer 4 made of a resin added with an isocyanate resin having a viscosity of 7 to 15 g / m ² (dry) is applied.

As the resin having a hydroxyl group which constitutes the second adhesive layer 4, in addition to the resins such as the alkyd resin, acrylic resin, nitrocellulose and polyvinyl alcohol, for example, as a plasticizer for vinyl chloride resin. A known polyester plasticizer having a hydroxyl group (polyester polyol) may be mixed as a crosslinking agent in an amount of 3 to 15 parts by weight.

Then, on the second adhesive layer 4, a transparent or translucent sol-like polyvinyl chloride resin (a stabilizer or a viscosity reducing agent is added to the polyvinyl chloride resin, or a polyol such as polyester is added thereto. Configured by adding a plasticizer)
Is applied to form a polyvinyl chloride clear layer 5 having a film thickness of 0.
The composite decorative sheet of the present invention can be obtained by providing the composite decorative sheet of the present invention at a thickness of 05 to 0.3 mm, heating and appropriately embossing the surface with an embossing roll.

On the clear layer 5 on which the embossing 6 is applied, a two-component curing type urethane resin is added in an amount of 1 to 4 g / m ^2.
(Dry) is applied to appropriately provide the top coat layer 7.

Specific examples, application examples, and test examples in the present invention will be shown below. <Example 1> As a paper base material, an impregnated paper having a basis weight of 50 g / m ² (paper in which titanium paper is impregnated with, for example, an acrylic latex resin or the like) and a urethane-based two-component curable adhesive is used in an amount of 1 g /
m ² (dry) is applied to provide a first adhesive layer, and a nitrocellulose-based gravure printing ink to which 12 parts by weight of an isocyanate resin has been added is applied solidly (overall), and an isocyanate resin of 12 parts by weight is further applied. A print pattern is formed by printing a print pattern with a nitrocellulose-based gravure printing ink with added parts, and subsequently a vinyl chloride-based resin (adding 3 to 15 parts by weight of isocyanate) is applied at 10 g / m ² for second adhesion. An agent layer is provided.

The application of the first adhesive layer to the application of the second adhesive layer is performed online, and then a vinyl chloride sol containing a vinyl chloride resin is mixed with a comma coater.
Apply to a thickness of 2 mm to form a clear layer, then 18
A heating operation is performed at 0 ° C. for 60 seconds or more to dry and solidify, and heating and pressure embossing is performed.

Finally, if necessary, a urethane topcoat agent was applied in an amount of 2 g / m ² (dry) to obtain a composite decorative sheet having improved surface properties and design.

The mixing ratio of the clear layer made of the vinyl chloride sol is as follows. Polyvinyl chloride resin 100 parts by weight Plasticizer 42 parts by weight Stabilizer 2 parts by weight Thickener 9 parts by weight

Next, examples of applications in which the composite decorative sheet of the present invention is attached to a particle board base material and subjected to surface treatment will be described below. <Application Example 1> The composite decorative sheet of the present invention (see FIG. 1 (c)) obtained in the above Example 1 was used with an ethylene-vinyl acetate adhesive (one-component curing type or two-component curing type). The surface of the particle board base material (plate material) having a thickness of 5 mm, or the surface of the particle board base material (plate material) and the end surface of the base material are attached so as to be wrapped around the particle board base material ( Board) was obtained. Adhesive coating amount: 5.5 mg / cm ² Laminating temperature: normal temperature or 60 ° C., laminating press pressure: 20 kg
f / cm ² × 20 seconds

Next, using the plate-shaped particle board subjected to the above-mentioned surface treatment, a rectangular quadrangular side plate portion (four side plates) of a right-angled quadrangle used for a case such as furniture or a capinet was prepared.

In the production of the rectangular tubular side plate portion of the right-angled quadrilateral, one surface-treated particle board is prepared, and three of the four corner portions of the rectangular tubular side plate portion to be produced are to be produced. From the back surface side of the portion corresponding to (1) to the depth before reaching the paper base of the laminated composite decorative sheet, V-cut processing was performed in parallel and straight lines. After that, the surface-treated particle board was bent exactly at right angles with the V-cut three parts as folds, with the composite decorative sheet side as the outside and the particle board base material side as the inside, and both ends of the particle board. Are joined together at right angles to form a rectangular quadrangular side surface of a right-angled quadrilateral that is continuous on the outside with a composite decorative sheet, and the abutted portions are appropriately joined with a bonding material such as an adhesive or a metal fitting, thereby forming a composite decorative sheet. The square tubular side part used for the case of furniture, capinet, etc., which was installed by

The composite decorative sheet of the present invention which has been subjected to the surface treatment on the particle board does not cause whitening due to V-cut processing, and the composite decorative sheet at the corner of the bend of the particle board has no paper. No phenomenon was observed.

<Application Example 2> The composite decorative sheet of the present invention (see FIG. 1 (c)) obtained in the above Example 1 was prepared by using a vinyl chloride-vinyl acetate copolymer adhesive (two-component curing type). Then, the wooden base material is preliminarily scraped into a predetermined surface shape (curved surface shape) and molded into a rectangular outer frame material forming an outer frame body of a fitting such as a door. On the surface of the outer frame material or on the outer surface such as the surface and the side surface,
Lapping (curved surface attachment) was performed to obtain an outer frame body in which a composite decorative sheet was surface-treated on the outer surface of the outer frame material. Adhesive application amount; 5.5 mg / cm ² bonding temperature; room temperature or any temperature of 40 ° C. to 60 ° C. bonding press pressure; 20 kgf / cm ² × 20 seconds

The composite decorative sheet surface-treated on the outer frame had good lapping suitability without causing paper breakage during curved surface lapping in lapping.

<Test Example> Regarding V-cut processing suitability, a composite decorative sheet of the present invention (Example 1), a conventional thin paper decorative sheet (thin paper coated paper), and a polyvinyl chloride doubling embossing method (multi-layered poly A conventional doubling embossed composite decorative sheet using polyvinyl chloride formed by a conventional method of embossing while laminating a vinyl chloride film) is attached to a particle board base material (plate material), respectively, and subjected to a covering treatment, Room temperature (20 ℃
(To 25 ° C.) or after being left in an atmosphere or cooled at 0 ° C. for 30 minutes, the surface treatment of the particle board base material is V-cut from the particle board base material (plate material) side to perform a V-cut processing suitability test. I went. As a result, as shown in Table 1 below, the composite decorative sheet of the present invention does not cause the whitening phenomenon due to V-cut (mechanical V-shaped cutting process) even at room temperature or when cooled, and the room temperature and low temperature V
It has excellent cutting performance. In addition, the paper base material (impregnated paper) of the composite decorative sheet according to Example 1 of the present invention has a polyvinyl chloride clear layer, and thus has thickness and strength, and paper breakage hardly occurs, and good results were obtained.

[0032]

[Table 1]

[0033]

The composite decorative sheet and the method for producing the same of the present invention are
A first adhesive layer 2 of a two-component curing type urethane resin having an isocyanate resin as a cross-linking curing agent and a printing layer 3 in which an isocyanate resin (5 to 20 parts by weight) is added on a paper base material layer 1.
And a second adhesive layer of a polyvinyl chloride resin (containing a resin having a hydroxyl group such as acrylic or polyester polyol) to which an isocyanate resin (3 to 15 parts by weight) is added, and a transparent or translucent poly Since the clear layer made of vinyl chloride is laminated in this order, the isocyanate group of the isocyanate resin contained in the resin forming each of the first adhesive layer 2, the printing layer 3, and the second adhesive layer 4 is added. , The paper base material 1 (cellulosic fiber material), the first adhesive layer 2, the printing layer 3, and the hydroxyl group contained in the resin constituting each layer of the second adhesive layer 4 undergo a crosslinking reaction to form a urethane bond, The second adhesive layer 4 and the polyvinyl chloride clear layer 5 are used for the polyvinyl chloride clear layer 5 and the isocyanate group of the isocyanate resin contained in the second adhesive layer 4. By bonding the active hydrogen plasticizer (for example, a hydroxyl group such as polyester polyol plasticizer), a composite decorative sheet over the layers from paper substrate layer 1 to polyvinyl chloride clear layer 5 is firmly adhered.

In particular, the printing ink constituting the printing layer 3 contains an isocyanate-based resin, and the isocyanate group of the isocyanate-based resin has a paper base closely attached to the front and back sides with the printing layer 3 interposed therebetween. It has a function of cross-linking with hydroxyl groups contained in the material 1 and the polyvinyl chloride-based second adhesive layer 4 to firmly sandwich and adhere the printing layer 3.

[0035]

INDUSTRIAL APPLICABILITY The composite decorative sheet of the present invention and the method for producing the same are provided with a first adhesive layer and a second adhesive layer, and printing is performed with an ink obtained by adding an isocyanate resin to a nitrocellulose ink between them. Layers are provided, and the composite decorative sheet is firmly adhered to each layer from the paper base material layer 1 to the polyvinyl chloride clear layer 5, and the conventional paper / paper
Adhesive strength is stronger than vinyl chloride paste and paper / vinyl chloride film, and compared to composite decorative sheets made of a single resin material using polyvinyl chloride, which has surface embossability, the paper base material is more resistant to tension and heat. Since variation in expansion and contraction can be suppressed, there is an effect of improving embossability, dimensional stability, and adhesion strength.

Further, since printing can be performed using a paper substrate as a base, the dimensional stability of the sheet on the printing machine against tension and heat is improved, and for example, a combination of vertical or horizontal grain patterns is provided. It becomes possible to print a printed pattern of decorative material on interior materials, wall materials, door materials, etc. on a single sheet with register accuracy, and of course, a composite decorative sheet having a polyvinyl chloride resin on the surface. Therefore, there is an effect such that good heat and pressure embossing suitability for the surface of the decorative sheet can be obtained.

[Brief description of drawings]

1A is a side sectional view of an embodiment of the composite decorative sheet of the present invention, FIG. 1B is a side sectional view of another embodiment of the composite decorative sheet of the present invention, and FIG. It is a sectional side view in other examples of a composite decorative sheet.

[Explanation of sign]

1 ... Paper base material 2 ... 1st adhesive layer 3 ... Printing layer 4 ... 2nd
Adhesive layer 5 ... Polyvinyl chloride clear layer 6 ... Embossing 7 ... Top coat layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location // B05D 5/06 101 D 6804-4D 7/24 302 K 6804-4D B29K 27:06

Claims (2)

[Claims] 1. A first adhesive layer 2 of a two-component curing type urethane resin on a paper base layer 1, a printing layer 3 printed with a printing ink obtained by adding an isocyanate type resin to a nitrocellulose type ink, and vinyl chloride. A composite decorative sheet comprising a second adhesive layer 4 in which an isocyanate resin is added to a resin as a curing agent, and a transparent or translucent polyvinyl chloride clear layer 5 in this order. 2. A first adhesive layer 2 is provided by applying a two-component curing type urethane resin on a sheet-shaped paper base material layer 1 such as thin paper or titanium paper, and then on the first adhesive layer 2. Nitrocellulose ink with isocyanate resin added to 1
Or, a printing layer 3 is formed by printing several colors, and a vinyl chloride resin mixed with an isocyanate resin is applied as a curing agent on the printing layer 3 to form a second adhesive layer 4. The second adhesive layer 4. A method for producing a composite decorative sheet, characterized in that a transparent or semitransparent polyvinyl chloride resin is applied onto 4 to form a clear layer 5.