JPH06190966A - Metal decorative panel and production thereof - Google Patents

Abstract

PURPOSE:To obtain a metal decorative panel enhanced in the sharpness of a decorative sheet and easy in transport and post processing by successively providing a flexible thermoplastic resin base material layer and a hard resin surface layer on a metal panel and providing a resin protective layer large in Young's modulus, high in thermal deformation temp. and low in heat shrinkage factor as compared with the resin of the base material layer on the surface layer in a releasable manner. CONSTITUTION:A base material 3 composed of a flexible synthetic resin, for example, polyvinyl chloride and a surface layer 4 composed of a hard synthetic resin are provided on a metal panel 1 through an adhesive layer 2 in this order. A protective layer 5 composed of a synthetic resin large in Young's modulus, high in thermal deformation temp. and low in heat shrinkage factor as compared with the synthetic resin of the base material layer, for example, stretched polyester is provided on the surface layer 4 in a releasable manner. A pattern printing layer 6 is provided between the base material layer 3 and the surface layer 4 in many cases. By this constitution, the sharpness of the design of a decorative sheet is kept and handling becomes easy in transport and post-processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved metal decorative plate and a method for manufacturing the same.

[0002]

2. Description of the Related Art The manufacture of a decorative plate having a metal plate as a base material and a synthetic resin layer having a hard coating film formed thereon
Conventionally, this is done by stacking a decorative sheet of a thermoplastic resin on a metal plate coated with an adhesive, and applying pressure with a roll to bond them together. Regardless of whether a thermoplastic resin or a thermosetting resin is used as the adhesive, the metal plate is often heated in order to ensure the adhesion, and the pressure is applied at a temperature equal to or higher than the softening point of the decorative sheet. It is preferable to use a heating roll.

However, if the working temperature is too high, the decorative sheet is likely to be broken and the bonding work becomes difficult.
On the other hand, in order to obtain a sufficient adhesive force, a heating temperature of 150 ° C or higher is desirable. Further, since the hard coating film does not follow the shrinkage of the thermoplastic resin sheet due to the cooling of the metal plate after lamination, the wrinkle-like wrinkles are likely to appear on the surface of the decorative sheet. If you do not heat the metal plate and use the pressure roll at room temperature, or even if you heat it if you stop it at low temperature, you can prevent the above problems, but in the conventional one the decorative sheet picks up the surface shape of the metal plate and deforms, It was easy to lose the clarity of the decorative sheet design.

If a hard coating film is not formed, chilly wrinkles cannot be formed much, but if it is transported or post-processed without protecting the surface of the decorative plate, another problem that stains and scratches are likely to occur occurs. . If you pay attention to it,
It becomes difficult to increase productivity.

[0005]

The object of the present invention is, as one measure against such a problem, that the decorative sheet has a high image clarity and the surface is protected so that it can be easily transported and processed. To provide a metal decorative plate. It is also within the scope of the present invention to provide a method for manufacturing a metal decorative plate with improved workability in bonding.

[0006]

The metal decorative plate of the present invention comprises
As shown in FIG. 1, a base layer (3) made of a flexible synthetic resin and a surface layer (4) made of a hard synthetic resin are provided on a metal plate (1) with an adhesive layer (2) interposed therebetween. In that order, a protective layer (5) made of synthetic resin having a Young's modulus higher than that of the synthetic resin of the base material layer, a higher thermal deformation temperature, and a lower heat shrinkage rate than that of the synthetic resin of the base material layer is provided in a peelable manner. Is.

The term "heat shrinkage rate" as used herein means the degree of shrinkage after bonding under heating and cooling.

A pattern printing layer (6) is often provided between the substrate layer (3) and the surface layer (4). An appropriate primer is used if necessary to ensure the adhesion between the base layer (3) and the surface layer (4).

The metal plate (1) is selected from galvanized steel plates, chromic acid-treated galvanized steel plates, stainless steel plates, aluminum plates, etc., which are suitable for use as decorative plates.

The adhesive may be one that is commonly used for metals, and the application amount and application means are determined appropriately for each adhesive, and therefore, they are followed. Thermosetting resin-based adhesives such as polyurethane having isocyanate as a curing agent, unsaturated polyester, or epoxy resin having an amine as a curing agent are preferable from the viewpoint of having sufficient adhesive strength and heat creep resistance. In the thermoplastic resin system, thermoplastic polyester, thermoplastic polyurethane and the like, which have high crystallinity and a melting point of 120 ° C. or higher, are preferable.

As the flexible thermoplastic synthetic resin forming the base material layer (3), a material having good elongation is used so as to obtain high post-processability. Typically, semi-rigid or soft polyvinyl chloride, or a copolymer of vinyl chloride and vinyl acetate, acrylic acid ester or the like is suitable. In addition, polyethylene, polypropylene, polycarbonate, ABS resin and the like can be used. A film having a thickness of several [mu] m to several mm is optionally printed with a pattern for use.

The hard synthetic resin constituting the surface layer (4) forms a three-dimensional network cross-linked polymer, and is a polyfunctional polyacrylate, epoxy type, unsaturated polyester type or urethane type, It is advisable to use an ultraviolet or electron beam curing type synthetic resin as an ink for solid printing or application, and then to cure. Instead of these, thermosetting synthetic resins such as epoxy, melamine, polyurethane, unsaturated polyester, and polysiloxane may be used. The coating amount is also properly selected within the range of several μm to several mm.

The protective layer (5) is preferably a film of stretched polyester, stretched polypropylene, polycarbonate, cellulose triacetate or the like. Thickness is 10 μm
The above is enough.

The flexible thermoplastic synthetic resin film absorbs irregularities on the surface of the metal plate or irregularities due to uneven coating of adhesive when the metal plate is attached to the metal plate by using a mirror surface metal roller, and the surface is mirror-finished. 100 to 1 to finish
It must be softened and plasticized at a temperature of 50 ° C. On the other hand, up to 60 decorative metal plates are placed in normal use
At ambient temperature of ~ 80 ° C, it is difficult for it to soften or flow significantly.
In order to satisfy such conditions, the Vicat softening temperature Tv of the thermoplastic synthetic resin must be 60 ° C. or higher and 150 ° C. or lower.

The thermoplastic synthetic resin film is supplied as a strip-shaped roll and continuously bonded to a metal plate, and in view of suitability for drawing and bending required for a decorative metal plate, Young's modulus Ey
However, it should be approximately 2.5 kg / cm ² or less.

On the other hand, as the protective film, those having both Tv and Ey larger than those of the thermoplastic synthetic resin are used.

The heat shrinkage depends on the properties of the film itself, the processing conditions (for example, the production method, the degree of polymerization, the filler, the presence / absence of stretching), and the adhesion conditions to the metal plate.
Select so that the heat shrinkage of the thermoplastic synthetic resin film is smaller than that of the protective film.

The following combinations are suitable as specific materials.

Thermoplastic synthetic resin protective film Soft or semi-rigid biaxially oriented polyethylene terephthalate, biaxially oriented poly (ethylene chloride) vinyl chloride naphthalate, polyarylate, biaxially oriented polypropylene, polycarbonate, cellulose triacetate , Polyether ether ketone, Polyimide ABS resin Biaxially oriented polyethylene terephthalate, Biaxially oriented polyethylene naphthalate, Polyarylate, Cellulose triacetate, Polyether ether ketone, Polyimide polystyrene or biaxially oriented polyethylene terephthalate, Biaxially oriented polyethylene polymethacryl Acids Tylene naphthalate, polyarylate, polyether methyl terketone, polyimide.

The method for producing a decorative metal sheet of the present invention has a base film made of a flexible thermoplastic synthetic resin, a surface layer made of a hard synthetic resin, and a Young's modulus larger than that of the base film and a heat distortion temperature. A protective film made of a synthetic resin having a high and low heat shrinkage ratio is laminated so that the adhesive force between the base film and the surface layer is greater than the adhesive force between the surface layer and the protective film. The laminated material is attached to a metal plate via a thermosetting adhesive, and the adhesive force between the metal plate and the base film is applied between the surface layer and the protective film in the laminated material by applying heat and pressure. The adhesive strength is greater than the adhesive strength of

[0021]

When the protective layer having a Young's modulus higher than that of the base material film, a higher thermal deformation temperature and a lower heat shrinkage ratio is used, the base material layer (3) is not bonded to the base material layer after bonding to the metal plate. Even when contracted, the surface layer (4) is not dragged by the surface layer (4) to be deformed, and is laminated while maintaining high flatness. As a result, the sharpness of the decorative sheet design can be maintained.

The presence of the protective layer prevents breakage of the decorative sheet due to heat during manufacturing, improves workability, and enables the use of a high temperature at which the adhesive can sufficiently exert its adhesive force. Furthermore, the presence of the protective layer facilitates handling during transportation and post-processing and prevents scratches and stains.

After post-processing and after application as a decorative material, the protective layer has a peel, that is to say the adhesive force between the protective layer and the surface layer is between the metal plate and the substrate layer and the substrate layer. Since the adhesive strength between the surface layer and the surface layer is smaller than that of the surface layer, the surface layer can be easily peeled off to form the surface layer.

[0024]

【Example】

 1. Ink for surface layer Two types of curable inks were prepared with the following formulations.

Ink A: UV-curable hexamethylene diisocyanate 10 parts by weight Isophorone diisocyanate 10 Dihexanol 5 1,4-Cyclohexanedimethanol 5 Polycaprolactone 5 2-Ethylhexyl acrylate 5 Photoinitiator (Irgure 148) 1 Ink B: Thermal curing Type two-component curing type polyurethane (acrylic polyol main agent 100 + toluene diisocyanate curing agent 7 + catalyst 4) 1. Production of decorative sheet (1) A colored polyvinyl chloride film (thickness 100 μm) containing 20 parts by weight of a plasticizer DOP was used as a base film, and the ink A was applied by a gravure roll method for a surface film, Biaxially stretched PET that is transparent after drying
A film (thickness 25 μm) was attached as a protective film. Irradiate ultraviolet rays from the PET film side,
A decorative sheet "A-1" was obtained.

(2) A decorative sheet "A-2" was obtained in the same manner as in (1) except that an oriented polypropylene (OPP) film (thickness: 30 μm) was used as a protective film.

(3) For comparison, a decorative sheet without a protective film was obtained by carrying out in (1) without laminating a transparent PET film. This is referred to as a decorative sheet "A-3".

(4) Also as a comparative example, a decorative polyvinyl chloride film (thickness 150 μm) added with 20 parts by weight of DOP was used as the base film, and the decorative sheet “A- without protective film” was used as in (3). I got 4 ".

(5) Plasticizer DOP 10 parts by weight + TCP5
Colored polyvinyl chloride film with 1 part by weight added (thickness 1
00 μm) was used as a substrate film, and ink B for a surface film was applied thereto by a gravure roll, and after drying, a transparent biaxially stretched PET film (thickness 25 μm) was laminated as a protective film. It was aged at 40 ° C. for 3 days to obtain a decorative sheet “B-1”.

(6) For comparison, a product without a protective film in (5) was prepared and similarly cured to obtain a decorative sheet "B-2".

(7) As a comparative example, a colored polyvinyl chloride film (thickness 150 μm) containing 20 parts by weight of DOP was used as a base film, and a decorative sheet “B- I got 3 ”.

3. Manufacturing of metal decorative plate I. An unsaturated polyester adhesive containing isocyanate as a cross-linking agent is applied on a galvanized steel sheet (thickness: 6 mm) (application thickness: 3 μm), and the temperature of the plate is 200 ° C. Attempted stacking.
The workability and surface condition of the product are as follows.

No. Decorative base material PVC protective layer Laminating work Product surface Sheet thickness (μm) Thickness (μm) 1 A-1 100 PET25 Yes Good * 2 2 A-1 100 OPP30 Yes Good 3 A-3 100 No No * 1-4 B-3 100 No No-5 A-4 150 No Yes * 3 6 B-4 150 N / A Poor * 1 Cannot be bonded due to sheet breakage. * 2 A smooth surface with high image clarity. * 3 Chirimen-like pattern is formed and the image clarity is also reduced.

II. The above operation was repeated while changing the conditions of the laminating operation. The results are as follows.

Chemical protective layer Steel plate roll No. Sheet thickness Temperature Temperature Lamination work Adhesion Product surface (μm) (℃) (℃) 7 A-1 PET 25 200 200 Yes Good Good 8 A-1 PET 25 150 150 Yes Somewhat bad 9 A-1 PET 25 200 Normal temperature Yes Yes Some bad 10 B-1 No 200 200 No − − 11 B-1 None 150 150 Yes Somewhat bad 12 B-1 No 200 200 Room temperature Yes Somewhat bad

[0036]

EFFECTS OF THE INVENTION The metal decorative plate of the present invention has a smooth surface and has a high sharpness of design. Since the protective layer is not damaged during post-processing such as bending, it is easy to remove the protective layer after processing or after applying as a decorative plate. High workability in manufacturing.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing the configuration of a decorative material of the present invention.

[Explanation of symbols]

 1 Metal Plate 2 Adhesive Layer 3 Base Layer 4 Surface Layer 5 Protective Layer 6 Design Layer

Claims (2)

[Claims] 1. A base layer made of a flexible thermoplastic synthetic resin and a surface layer made of a hard synthetic resin are provided in this order on a metal plate, and the Young's modulus of the base layer is larger than that of the synthetic resin of the base layer. A metallic decorative plate having a peelable protective layer made of a synthetic resin having a high heat distortion temperature and a low heat shrinkage rate. 2. A base material film made of a flexible thermoplastic synthetic resin, a surface layer made of a hard synthetic resin, and a synthetic material having a Young's modulus higher than that of the base material film, a high heat deformation temperature, and a low heat shrinkage rate. A protective film made of resin,
The substrate film and the surface layer are laminated so that the adhesive force between the surface layer and the protective film is greater than the adhesive force between the surface layer and the protective film, and the obtained laminated material is placed on a metal plate via a thermosetting adhesive. The metal decorative plate, which is formed by laminating and bonding by heat and pressure so that the adhesive force between the metal plate and the base film is larger than the adhesive force between the surface layer in the laminated material and the protective film. Manufacturing method.