JP2000301663A - Emboss-like film laminated steel panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an emboss-like colored film laminated steel panel being a vinyl chloride substitute material having surface hardness higher than that of a vinyl chloride coated steel panel and excellent in design effect and moldability. SOLUTION: In a film laminated steel panel wherein a colored resin layer, an adhesive layer and a transparent resin film are successively laminated on the surface of a steel panel, the transparent resin film comprises a polyester resin obtained by copolymerizing cyclohexanedimethanol with PET as a comonomer and embossing is applied to this film. The transparent resin film may comprise a polyester resin obtained by copolymerizing cyclohexanedimethanol and isophthalic acid with PET as comonomers. A printing ink layer may be provided on the surface being in contact with the adhesive layer of the transparent resin film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embossed film-laminated steel sheet having excellent emboss appearance, printing design, high hardness and excellent formability.

[0002]

2. Description of the Related Art Recently, as a social problem such as the global environment and waste pollution, the use of alternative materials to polyvinyl chloride resin, which is a general-purpose plastic, is urgently required. The coated steel sheet is no exception, and the development of PVC-free steel sheet is being promoted. As a representative example of a PVC-free steel sheet, a polyolefin (hereinafter, referred to as PP) film-laminated steel sheet such as polypropylene can be given. PP film laminated steel sheet
Tactile sensation and embossing close to those of PVC steel sheets are possible, and they are quickly adopted. However, the surface hardness of the PP film laminated steel sheet is softer than that of the PVC steel sheet, and handling scratches are likely to occur during press forming. PET film laminated steel sheet is also a promising material as a PVC-free steel sheet. PE
The T film is tough and can reduce the thickness of the film. The thinned PET film-laminated steel sheet is a material that has a high surface hardness and is unlikely to cause handling scratches.

[0003]

However, the PET film is tough as described above, and the film itself is hardly deformed even when embossing is performed. . The present invention has been devised to solve such a problem, and as a substitute for a PVC steel sheet, has a hard surface using a copolymerized polyester resin film, has an embossed appearance, and imparts print design. It is an object of the present invention to provide a film-laminated steel sheet that can be used.

[0004]

In order to achieve the object, the embossed film-laminated steel sheet of the present invention is a film-laminated steel sheet having a colored resin layer, an adhesive layer, and a transparent resin film laminated on a steel sheet surface in this order. , The transparent resin film is made of a polyester resin obtained by copolymerizing PET with cyclohexanedimethanol as a comonomer,
An embossed film was used. The transparent resin film may be made of a polyester resin obtained by copolymerizing PET with cyclohexanedimethanol and isophthalic acid as comonomers. A printing ink layer may be provided on the surface of the transparent resin film that is in contact with the adhesive layer.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have found that the surface hardness is high,
The inventors carefully studied a film-laminated steel sheet which is unlikely to cause scratches during handling and has an embossed appearance. The present invention has been completed by finding a resin film satisfying the above conditions. Copolyester resin film as a transparent resin film, PET as a comonomer,
A film formed from cyclohexane dimethanol or a polyester resin obtained by copolymerizing cyclohexane dimethanol and isophthalic acid and then embossed was used. The copolyester resin used in the present invention has been developed by Eastman Chemical Company for the purpose of improving the molding processability, heat sealing property, etc. of PET. Because of its excellent moldability and heat sealability, it is used for food packages, cards and the like. Here, the inventors have
It has been found that a film molded product of a polyester resin obtained by copolymerizing ET with cyclohexane dimethanol as a comonomer has excellent embossability. An embossed appearance equivalent to that of the PVC film was obtained at a processing temperature of 120 to 180 ° C. under the same conditions as for the PVC film.

The copolymerized polyester resin is obtained by copolymerizing PET with cyclohexane dimethanol as a comonomer, and further copolymerizing isophthalic acid with cyclohexane dimethanol. The copolymer of isophthalic acid is excellent in transparency and moldability. Colored pigments, aluminum powder, other polyester resins to the extent that these copolymerized polyester resins do not impair transparency,
Additives such as an ultraviolet absorber may be blended, and those formed into a film by an extrusion method or the like are used.

When laminating a transparent resin film on a steel sheet, the film thickness is 40 μm in consideration of the emboss depth.
m or more. Although the upper limit of the film thickness is not particularly limited, it is not preferable that the thickness exceeds 300 μm from the viewpoint of cost. The copolymerized polyester resin film is easier to adhere than the PET film, but if necessary, the surface in contact with the adhesive layer can be easily corona-discharged, or can be easily adhered by coating the film surface with acrylic resin, polyester resin, etc. Processing may be performed.
During the embossing of the copolymerized polyester resin film, it is necessary to suppress the propagation of the embossed shape to the surface in contact with the adhesive layer. For example, when a deep embossing process is performed on a film having a thickness of less than 100 μm, when the emboss propagates to the back side of the film (the surface in contact with the adhesive layer), the deep portion of the emboss protrudes into the adhesive layer, and a thin film adhesive layer described later is formed. It is difficult to firmly adhere the film to the steel plate via the steel sheet. Therefore, at the time of embossing, it is necessary to take measures such as pressing down a smooth roll on the surface in contact with the adhesive layer which is the opposite surface of the emboss roll. The order of embossing and printing on the surface of the transparent resin film of the present invention is not particularly limited. However, when the embossing form has large irregularities, it is preferable to perform printing first and embossing.

As the colored resin layer, an epoxy resin, a polyester resin, a polyurethane resin, a linear high-molecular polyester resin or the like is used as a matrix resin, and a colored pigment,
Those containing an extender, a rust preventive pigment, and other additives are used. The colored resin layer is not limited to a single layer but may be formed in multiple layers, and the thickness is preferably about 2 to 20 μm per layer. The adhesive layer is formed when a colored resin layer and a transparent copolymerized polyester resin film (a printed layer may be provided) are bonded. The adhesive used is
Sufficient adhesiveness can be obtained with a general adhesive, and examples thereof include a one-component or two-component polyester resin-based adhesive and a polyurethane resin-based adhesive. A trace amount of a coloring pigment, aluminum powder, an ultraviolet absorber, or the like can be added to this adhesive. Further, a printing ink layer can be provided on the surface of the transparent resin film which is in contact with the adhesive layer, but the adhesive layer must be transparent except that the printing ink layer includes a solid layer.
The thickness of the adhesive layer is preferably about 2 to 10 μm.

In the present invention, as described above, a printing ink layer can be provided on the surface of the transparent resin film which is in contact with the adhesive layer. As the printing ink, one obtained by mixing a pigment and various additives with a base resin such as a vinyl chloride-vinyl acetate copolymer, an acrylic resin, a polyester resin, and a polyurethane resin is used. The transparent resin film provided with the printing layer includes those provided with a pattern printing ink layer, and those provided with a solid printing ink layer on the pattern printing ink layer. Printing and drying are repeated. The steel sheets used are various types of plated steel sheets such as galvanized steel sheets, alloyed galvanized steel sheets, zinc-aluminum alloy coated steel sheets, and aluminum plated steel sheets, aluminum sheets,
There is a stainless steel plate, etc., which is subjected to pre-coating treatment such as phosphate treatment or coating type chromate treatment as necessary. On a steel plate, a colored resin paint is applied and baked by a known coating method to form a colored resin layer, an adhesive layer is formed in the same manner, and a transparent resin film or a printing ink layer is formed on the upper surface in contact with the adhesive layer. The provided transparent resin film is laminated and immediately cooled to produce an embossed film-laminated steel sheet. When there are a plurality of colored resin layers, coating and drying may be repeated.

[0010]

【Example】

Example 1; plate thickness: 0.5 mm, weight per side: 45
g / m ² hot-dip galvanized steel sheet is subjected to a coating type chromate treatment, and an epoxy resin-based primer paint containing a rust-preventive pigment is applied so as to have a dry film thickness of 5 μm. After heating and drying for 40 seconds, a polyester resin-based white paint is applied thereon so that the dry film thickness becomes 15 μm, and then heated and dried in an oven for 60 seconds so that the maximum attainable plate temperature becomes 210 ° C. , 2
A liquid polyester resin-based adhesive (curing agent: isocyanate) is applied so as to have a dry film thickness of 5 μm, and is heated and dried in an oven for 60 seconds so that the maximum attainable plate temperature is 150 ° C. A transparent resin film having a thickness of 50 μm was laminated such that the surface opposite to the embossed surface was in contact with the adhesive layer, and was cooled with water. Here, the transparent resin film used was obtained by extruding a polyester resin obtained by copolymerizing PET with cyclohexane dimethanol as a comonomer into a film having a thickness of 50 μm, and then embossing the satin finish.

Example 2 A transparent resin film was used in Example 1.
An inorganic abstract pattern is printed with a dark gray polyurethane resin printing ink on the opposite side of the embossed surface of the film used in the above, and solid printing is performed on it with a light ivory polyurethane resin printing ink Other conditions are the same as in Example 1. Example 3 A transparent resin film was prepared by mixing 30 parts by weight of an amorphous polyester resin having a melting point of 150 ° C. with 100 parts by weight of a polyester resin obtained by copolymerizing cyclohexane dimethanol as a comonomer with PET, and having a film thickness of 70 μm. Extrusion molding into film, wood grain pattern printing with dark brown polyester polyurethane resin-based printing ink, solid printing with brown polyester polyurethane resin-based printing ink on top, and matching with the printed pattern on the other side The conditions are the same as in Example 1 except that the wood grain emboss was used.

Example 4: SUS43 having a thickness of 0.45 mm
A steel plate is subjected to a coating type chromate treatment, and an epoxy resin-based ivory color paint is applied so that a dry film thickness becomes 15 μm, and is heated and dried in an oven for 40 seconds so that the maximum attained plate temperature becomes 230 ° C. A two-component polyurethane resin-based adhesive (curing agent: isocyanate) having a dry film thickness of 5
μm, and the maximum plate temperature reached 1 in the oven
After heating and drying for 60 seconds to 40 ° C, immediately
A transparent resin film having a thickness of 50 μm was laminated thereon such that the surface opposite to the embossed surface was in contact with the adhesive layer, and was cooled with water. Here, the transparent resin film used is a PET film having a film thickness of 5%, which is a polyester resin obtained by copolymerizing cyclohexane dimethanol and isophthalic acid as comonomers.
It is formed by extruding a 0 μm film, printing a Japanese paper pattern with a light gray polyurethane resin-based printing ink, and embossing on the opposite surface.

Each of the embossed film-laminated steel sheets according to the present invention has both embossed appearance and print design, and does not crack even when folded at 180 degrees. The hardness also indicates B in pencil hardness, 4 mm R square tube drawing forming process (wrinkle presser 100 kg, drawing speed 10 mm /
(Second, drawing depth 20 mm). As a result, no peeling of the film occurred, and there was no handling scratch because the hardness was higher than that of the PVC steel sheet.

[0014]

As described above, the embossed film-laminated steel sheet of the present invention exhibits an embossed appearance and print design, has excellent moldability, and is harder than a PVC steel sheet. It is suitably used as a member such as an interior wall material.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenichi Okubo 7th day, Takatani Shinmachi, Ichikawa-shi, Chiba Co., Ltd. Painting & Composite Materials Research Dept., R & D Co., Ltd. (72) Inventor Kenji Koshiishi, Ichikawa-shi, Chiba 7th, Takatani Shinmachi New Steel Works Co., Ltd. Coating and Composite Materials Research Dept., Technology Research Laboratory F term (reference) 4F100 AA22 AB03A AB18 AK01B AK42C AK42J AK44G AK53 AL01C AR00D BA03 BA04 BA07 BA10A BA10C CA13 CB00 CB02 EH71 EJ65 EJ69 GB HB00B HB21C HB22 HB31D JB02H JK12 JL01 JL10B JN01C

Claims (3)

[Claims] 1. A film-laminated steel sheet in which a colored resin layer, an adhesive layer and a transparent resin film are laminated in this order on a steel sheet surface, wherein the transparent resin film is a polyester resin obtained by copolymerizing polyethylene terephthalate resin with cyclohexanedimethanol as a comonomer. An embossed film-laminated steel sheet, characterized in that the film is embossed. 2. The embossed film-laminated steel sheet according to claim 1, wherein the transparent resin film is made of a polyester resin obtained by copolymerizing cyclohexane dimethanol and isophthalic acid as comonomers with polyethylene terephthalate resin. 3. The embossed film-laminated steel sheet according to claim 1, wherein a printing ink layer is provided on a surface of the transparent resin film which is in contact with the adhesive layer.