JPH01275040A - Decorative sheet and its manufacture - Google Patents

Abstract

PURPOSE:To enable simple and efficient manufacture of sheets which are highly abrasion-resistant, best-suited to after processing such as thermal embossing or lapping, and compatible with a substrate for lamination by making transparent a polyvinyl chloride or modified polyvinyl chloride resin layer in a specified degree of polymerization. CONSTITUTION:A transparent resin layer 3 consisting or polyvinyl chloride or modified polyvinyl chloride in a degree of polymerization of 500-1,100 and plasticizer as main components is provided on printing paper 1. A fluid of comparatively low viscosity at normal temperature and with a highly solid component can be obtained by adding appropriate plasticizer and diluent such as hydrocarbon solvent with a low boiling-point to polyvinyl chloride in a degree of polymerization of 500-1,100 to prepare organosol. This decorative sheet is a composite sheet of a printing paper base 1 and a transparent polyvinyl chloride resin layer 3; the former is a material for increasing adhesion with a basic material and the latter gives flexibility for improved workability and also surface resistance such as against abrasion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a surface decorative sheet for building materials such as furniture, wall materials, ceiling materials, etc., and a method for manufacturing the same.

[Prior art] Conventional surface decorative sheets include (1) pre-coated paper, which is coated with aminoalkynd resin or urethane resin after printing is applied on base paper, and (2) paper made by calendering or extrusion. Polyvinyl chloride decorative sheets printed on sheeted polyvinyl chloride sheets, and decorative sheets made by heat-sealing transparent vinyl chloride sheets on top of them, (
3) There is a composite decorative sheet made of a transparent polyvinyl chloride sheet that is laminated with a transparent polyvinyl chloride sheet using an adhesive after printing is provided on paper base paper.

[Problems to be Solved by the Invention] Regarding (1) of the above-mentioned conventional techniques, the surface resin layer has high rigidity, is hard (and brittle), and cannot withstand processing that requires flexibility such as bending. Usually, the solid content of the paint cannot be designed to be high and it is difficult to obtain a high coating amount, so there is a problem that it is difficult to obtain a decorative sheet with excellent wear resistance.

Regarding (2), it is highly flexible as a decorative sheet,
Also, those topped with a transparent polyvinyl chloride sheet have abrasion resistance, but when laminating decorative sheets to substrates such as plywood, particle board, and fiberboard, there is a narrow range of adhesive options, and ordinary General-purpose adhesives such as vinyl acetate and urea cannot be used. Although it is possible to laminate the above substrate using ethylene-modified vinyl acetate, etc.
Since the entire decorative sheet is made of polyvinyl chloride, it lacks heat resistance, and with a normal roll laminator, lamination must be performed at a roll temperature of 60°C or less and at low speed, making it extremely unsuitable for work.

Regarding (3), it overcomes the problems of (1) suitability for bending and (2) suitability for laminating work, but
The printing paper and polyvinyl chloride sheet must be laminated using adhesive, which is time-consuming. In addition, the mechanical properties such as interlaminar strength and tensile strength of the polyvinyl chloride sheet used in regular tongs are stronger than that of the base paper, and there is a large difference in physical performance between the two, resulting in peeling between the two layers and There is a problem that peeling easily occurs.

An object of the present invention is to solve the problems of the prior art as described above, and to simply and efficiently produce a decorative sheet that has excellent suitability for post-processing and excellent suitability for lamination with a base material.

[Means to solve the problem]

The present invention aims to solve the above problems by printing on printed paper.
A decorative sheet characterized by providing a transparent resin layer mainly composed of polyvinyl chloride or modified polyvinyl chloride with a degree of polymerization of 500 to 1,100 and a plasticizer, and a decorative sheet with a degree of polymerization of 500 to 1,100 on printed paper. 100 polyvinyl chloride or modified polyvinyl chloride, a plasticizer, and a diluent as main components, and gelatinizes the organosol to form a transparent resin layer. .

The present invention will be explained in more detail below.

FIG. 1 is a sectional view of a decorative sheet according to an embodiment of the present invention, in which 1 indicates a printing base paper, 2 indicates a printing ink, and 3 indicates a transparent resin layer.

In the decorative sheet of the present invention, as shown in FIG. 2, a surface protective layer 4 may be provided on the transparent resin layer 3 to protect the transparent resin layer and adjust the gloss.

Further, as shown in FIG. 3, it is also possible to use a decorative sheet whose surface is suitably embossed.

The base paper for printing paper in the present invention is from 123 tsubo to
65g/m2 thin paper, reinforced paper with a basis weight of 23-65g/m'' mixed with water-soluble acrylic or polyamide, 30-40% water-soluble acrylic ester, melamine resin, etc.
Resin-impregnated or resin-coated paper with a basis weight of about 35 to 150 g/m2, impregnated or coated to a certain degree, basis weight of 35 to 150 g/m
In addition to paper base papers such as titanium paper, heat-resistant plastic films such as polyester films and polyamide films can also be used as the base paper, but paper base papers are preferred in consideration of adhesion with the transparent resin layer.

Print wood grain patterns, stone grain patterns, abstract patterns, single-color all-over coatings, etc. on the above base paper using regular printing methods such as gravure printing and offset printing, or print appropriate patterns on the base colored layer. You can.

Gravure printing is preferred from the viewpoint of printing durability, and the ink is colored using ordinary resins such as nitrocotton, cellulose acetate, vinyl chloride, acrylic resin, petirare, etc. alone or mixed or copolymerized as a vehicle. As the agent, a mixture of pigments, dyes, general organic solvents, etc. is used.

In addition, the printing paper is generally printed on base paper, but after printing on porous titanium paper with a weight of about 30 to 120 g/m2 using the same ink, water-soluble acrylic ester Paper impregnated with melamine resin or the like to increase interpaper strength can also be used as printing paper.

The resin component in the transparent resin layer of the present invention has a polymerization degree of 500.
~1.100 polyvinyl chloride or modified polyvinyl chloride.

When using polyvinyl chloride, it is difficult to produce pure polyvinyl chloride with a low degree of polymerization of about 500 or less. Copolymers of vinyl chloride and vinyl acetate with a degree of polymerization of about 300 to 500 are known to exist, but in order to coat them, they must be dissolved in a strong polar solvent to form a solution. The concentration is limited to 15 to 20% at most, making it difficult to obtain a coating agent with a high solids content.

In addition, for polyvinyl chloride with a high polymerization degree of 1,100 or more, the amount of plasticizer is usually 55 to 60 PHR (resin 1
If the amount is reduced below 0.00 parts by weight, the viscosity becomes extremely high and fluidity is lost, making coating difficult. For this reason, in order to have coating suitability, the proportion of polyvinyl chloride itself is reduced.

On the other hand, polyvinyl chloride with a degree of polymerization in the range of 500 to 1,100 can be made into an organosol by adding a suitable plasticizer and a diluent such as a low-boiling hydrocarbon solvent, so that it has a relatively low viscosity at room temperature. Moreover, a fluid having a high solids content can be obtained.

As the modified polyvinyl chloride, it is possible to use polyvinyl chloride modified by copolymerization with vinyl acetate, maleic acid ester, etc. in order to improve film-forming properties, heat resistance, etc.

In addition, when using isocyanates such as TDI and HnDI as a component of the transparent resin, using modified polyvinyl chloride with 011 groups will cause urethane bonds, which will improve the openness of the transparent resin layer and the strength of the coating film. can be done.

In this case, in order to have OI (group), it can be obtained by, for example, saponifying a copolymer of vinyl chloride and acetic acid.Also, if an isocyanate is mixed,
By bonding with the cellulose of the paper base material, it also contributes to improved adhesion to the paper base material.

Plasticizers in the transparent resin layer include diethyl phthalate, dibutyl phthalate, butyl lauryl phthalate,
G, n-octyl phthalate, butyl benzyl phthalate, butyl phthalyl butyl glycolate 2 G2-
Ethylhexyl phthalate + ,,;-2-ethylhexyl adipate di-2-ethylhexyl azelate di-octyl sebacate, trioctyl phosphate
Methyl acetyl lysylate, diethylene glycol diperagonate, pentaerythritol derivatives, aromatic hydrocarbon condensates, alkylated polyaromatic hydrocarbon oils, polyesters, monoesters, pentachloromethyl stearate, liquid chlorinated paraffin, etc. alone It can be used alone or in combination.

The transparent resin layer is provided on the printing paper by coating the printing paper with an olkalysol containing polyvinyl chloride or modified polyvinyl chloride, a plasticizer, and a diluent as main components, and gelling it.

The thickness of the resin layer is not particularly specified, but in view of applications such as furniture, wall surfaces, ceiling materials, etc., it is preferable to apply the resin layer to a thickness of about 5 μm to 100 μm. To obtain the coating amount, a roll coater, knife rotor, fountain coater, flow coater, etc. can be used, but the uniformity of the coating and the smoothness of the coated surface Considering the properties and coating varnish beads, it is preferable to apply the organosol type resin using a gravure roll.

In the present invention, after the transparent resin layer is semi-gelled or gelled in order to protect the transparent resin layer and adjust gloss,
A protective layer may be further provided thereon if necessary. As the protective layer, any resin system such as acrylic, polyester, urethane, alkyd, etc. can be used, but it is necessary to protect the polyvinyl chloride layer and modify the heat resistance, solvent resistance, etc. From this point of view, it is preferable to use a curable type, and among them, a urethane type is preferable in terms of heat resistance, hardness, and adhesion to PVC resin. In this case as well, coating can be performed in the same manner as for the transparent resin layer.

In addition, in the present invention, a protective layer is provided as necessary.

After being provided, embossing may be performed. The transparent resin layer whose main component is polyvinyl chloride has excellent heat processability, so by heating the sheet to about 60 parts C or more,
Can be embossed.

Embossing can be performed with a conventional hot embossing machine.

The decorative sheet of the present invention can be used as a surface decorative sheet for building materials such as furniture, wall materials, ceiling materials, etc., but it can also be applied to parts that require wear resistance as well as parts that require curved surfaces. It is.

[For production]

The decorative sheet of the present invention is a composite sheet of a printed paper base and a polyvinyl chloride transparent resin layer, the former acting as a material that enhances adhesion performance with the base material, and the latter providing flexibility and making it easy to process. It works to impart surface properties such as wear resistance and wear resistance.

〔Example〕

Example 1 Normal wood grain printing was applied to 3 parts g/% thin paper (manufactured by Sanko Paper Corporation) using nitrified cotton thread ink MA (manufactured by Moroboshi Ink Corporation) using a rotogravure rotary printing machine to obtain printed paper. Ta.
゛Next, using a plate depth of 150μ, polyvinyl chloride (LJ)
After coating the resin (Hisol J-270, manufactured by Dainichiseika Kaisha, Ltd.) with a gravure roll and gelling it in a drying oven at 200°C to obtain a transparent resin layer with a thickness of 20μ, urethane resin was applied as a surface protective layer. (PTCZ-1 manufactured by Dainichiseika Chemical Co., Ltd.) at 5 g/++ (
Coated.

The above sheet was glued with vinyl acetate adhesive (AC31 manufactured by Chuo Rika).
5) was applied to a 2.7 m thick plywood, a decorative board with excellent wear resistance could be obtained.

Example 2 80 impregnated with 35 parts by weight of water-soluble acrylic acid ester
A wood grain printing paper was obtained in the same manner as in Example 1 using a nitrified cotton yarn ink on a resin-impregnated paper (FX manufactured by Kojin Co., Ltd.) of g/bo.

Next, similarly using a gravure roll with a plate depth of 150μ,
A transparent resin layer with the following composition was placed on the printing paper and heated to 200"C.
gelatinized.

Mineral turpentine 5 parts Dioctyl phthalate 30 parts Polyisocyanate 13 parts Kijirole 5 parts Next, 5 g/n of the same urethane resin as in Example 1 was coated on the transparent resin as a surface protective layer.

Furthermore, when hairline embossing was performed using a hot embossing machine with a pinch of 200 μm, the texture of the wood grain could be expressed well in terms of design, and a sheet that closely resembled natural wood could be obtained.

In addition, the sheet has excellent suitability for post-processing, and can be processed not only into flat decorative boards, but also into parts with curved surfaces and V-cut processing.

〔Effect of the invention〕

According to the present invention, since the polyvinyl chloride or modified polyvinyl chloride resin layer with a degree of polymerization of 500 to 1100 is provided as a transparent layer, it has excellent wear resistance and suitability for post-processing such as hot embossing and ramping. , and can easily and efficiently produce a decorative sheet that has excellent lamination suitability with a base material.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a decorative sheet that is an embodiment of the present invention. FIGS. 2 and 3 are cross-sectional views of decorative sheets that are other embodiments of the present invention. 1... Printing base paper 2... Printing ink 3... Transparent resin layer 4... Surface protective layer 5... Surface embossing Figure 1 Figure 2

Claims (14)

[Claims] (1) A decorative sheet characterized in that a transparent resin layer containing polyvinyl chloride or modified polyvinyl chloride with a degree of polymerization of 500 to 1,100 as main components and a plasticizer is provided on printing paper. (2) Claim 1 characterized in that the printing paper is made of paper quality.
Cosmetic sheet listed. (3) The transparent resin layer is formed from a mixture containing polyvinyl chloride or modified polyvinyl chloride with a degree of polymerization of 500 to 1,100, a plasticizer, and an isocyanate as main components. The decorative sheet described in 2. (4) A claim characterized in that the transparent resin layer is formed from a mixture whose main components are modified polyvinyl chloride having an OH group with a degree of polymerization of 500 to 1,100, a plasticizer, and an isocyanate. 3. Decorative sheet. (5) Claim 1, 2, 3, or 4, further comprising a transparent protective layer provided on the transparent resin layer.
Cosmetic sheet listed. (6) The decorative sheet according to claim 5, wherein the transparent protective layer is a cured resin. (7) The decorative sheet according to claim 6, wherein the transparent protective layer is formed from a mixture containing isocyanate and polyol as main components. (8) The decorative sheet according to any one of claims 1 to 7, wherein the surface is embossed. (9) An organosol mainly composed of polyvinyl chloride or modified polyvinyl chloride with a degree of polymerization of 500 to 1,100, a plasticizer, and a diluent is applied onto printing paper, and this is gelled to form a transparent resin layer. 2. The method for manufacturing a decorative sheet according to claim 1, further comprising forming a decorative sheet. (10) The manufacturing method according to claim 9, wherein the printing paper is made of paper. (11) Claim 9 or 1, characterized in that a transparent protective layer is further provided on top of the transparent resin layer.
The manufacturing method described in 0. (12) Claim 1 characterized in that the transparent protective layer is formed by applying and curing a curable resin.
1. The manufacturing method described in 1. (13) Claims 9, 10, 1, wherein the organosol is applied using a gravure roll coating method.
1 or 12. (14) Claims 9, 10, 11, characterized in that the embossing process is further carried out by applying enough heat to soften the transparent resin layer containing polyvinyl chloride or modified polyvinyl chloride and a plasticizer as main components. 13. The manufacturing method according to 12 or 13.