JP2000301662A - Emboss-like colored 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 having embossed appearance and excellent in moldability. SOLUTION: In a film laminated steel panel constituted by laminating a colored resin film on the surface of a steel panel through an adhesive layer, the colored resin film comprises a polyester resin obtained by copolymerizing cyclohexanedimethanol with a polyethylene terephthalate resin as a comonomer and embossing is applied to the colored resin film to be used. The colored resin film comprising a polyester resin obtained by copolymerizing cyclohexanedimethanol and isophthalic acid with a polyethylene terephthalate resin as comonomers may be used. A primer layer may be provided between the steel panel and the adhesive layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an embossed appearance,
The present invention relates to an embossed tinted film-laminated steel sheet having 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 PP film laminated steel sheet has a softer film hardness than the PVC steel sheet, and is liable to be scratched during handling during press molding. A biaxially stretched polyethylene terephthalate resin (hereinafter, referred to as PET) film-laminated steel sheet is also positioned as a PVC-free steel sheet. The PET film is tough, harder than PVC, and the film can be made thinner by that amount, so that handling scratches are less likely to occur.

[0003]

However, a PET film laminated steel sheet cannot obtain an embossed appearance like a conventional PVC steel sheet, and cannot reproduce a unique calm feeling. PET film is tough as described above,
Even when embossing is performed, the film itself is not easily deformed, and even if it is deformed, the amount of deformation is in an elastic range and therefore does not plastically deform. The present invention has been devised to solve such a problem, and an object of the present invention is to provide an embossed-colored film-laminated steel sheet using a colored resin film that exhibits an embossed appearance even when harder than PVC. .

[0004]

SUMMARY OF THE INVENTION The embossed tinted film-laminated steel sheet of the present invention has the following objects.
In a film-laminated steel sheet obtained by laminating a colored resin film via an adhesive layer on the surface of a steel sheet, the colored resin film is made of a polyester resin obtained by copolymerizing cyclohexane dimethanol as a comonomer with PET. Embossed. The colored resin film may be made of a polyester resin obtained by copolymerizing PET with cyclohexanedimethanol and isophthalic acid as comonomers. Further, a primer layer may be interposed between the steel sheet and the adhesive layer.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, the present inventors have intensively studied an embossed-colored film-laminated steel sheet having a hard surface and hardly causing scratches as a substitute for a PVC steel sheet. As a result, the inventors have found that embossing can be performed by using a component even on a PET-based film, and have completed the present invention. As the colored resin film, a film obtained by coloring a polyester resin obtained by copolymerizing cyclohexane dimethanol as a comonomer with a polyethylene terephthalate resin, or a film obtained by coloring a polyester resin obtained by copolymerizing cyclohexane dimethanol and isophthalic acid is used. The emboss was applied by engraving after film formation. 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.

Here, the present inventors have found that a polyester resin film formed by copolymerizing PET with cyclohexanedimethanol as a comonomer has excellent embossability. 120 which is the same condition as the PVC film
An embossed appearance equivalent to that of a PVC film was obtained at a processing temperature of １８０180 ° C. The copolymerized polyester resin is obtained by copolymerizing PET with cyclohexanedimethanol as a comonomer, and further copolymerizing isophthalic acid with cyclohexanedimethanol. The copolymer of isophthalic acid is excellent in transparency and moldability. Additives such as coloring pigments, extender pigments, other polyester resins, and ultraviolet absorbers may be added to these copolymerized polyester resins, and those formed into a film by an extrusion molding method or the like are used.

In laminating a film on a steel plate, the film thickness is 4 in consideration of the substrate concealing property and the emboss depth.
It is preferably at least 0 μm. Note that the upper limit of the film thickness is not particularly limited, but 300 μm is preferable in terms of cost.
It is not preferable to exceed m. Copolyester resin film is easier to adhere than PET film,
If necessary, the surface in contact with the adhesive layer may be subjected to a corona discharge treatment or an easy adhesion treatment such as coating of the film surface with an acrylic resin, a polyester resin or the like. 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.

As the adhesive, a general adhesive is used, and sufficient adhesiveness can be obtained. For example, a one-component or two-component polyester resin adhesive, a polyurethane resin adhesive, or the like can be used. A coloring pigment, a rust-preventive pigment, an extender pigment, and the like can be added to the adhesive as needed. The thickness of the adhesive layer is preferably about 2 to 10 μm. A primer layer may be provided between the steel sheet and the adhesive layer, and a polyester resin-based primer, an epoxy resin-based primer, or the like can be used as the primer. A rust preventive pigment, an extender pigment, and various additives can be added to the primer, if necessary.
It is preferably about 0 μm.

The steel sheets used include various types of coated steel sheets such as galvanized steel sheets, galvanized steel sheets, zinc-aluminum alloy coated steel sheets, and aluminum plated steel sheets, aluminum sheets, and stainless steel sheets. Apply pre-coating treatment such as salt treatment or coating type chromate treatment. An adhesive is applied to the surface of the steel sheet by a known coating method such as a roll coating method or a curtain coating method, and baked to form an adhesive layer, and an embossed colored copolyester resin film is laminated thereon. Immediately cool to produce an embossed tinted film laminated steel sheet. When a primer layer is provided, the coating and drying may be repeated as in the case of forming the adhesive layer.

[0010]

【Example】

Example 1; plate thickness: 0.5 mm, weight per side: 45
g / m ² hot-dip galvanized steel sheet is subjected to coating type chromate treatment, and a polyester-modified epoxy resin-based primer coating compounded with a rust-preventive pigment is applied so that the dry film thickness becomes 5 μm. After heating and drying at 210 ° C. for 40 seconds, a two-component polyester resin-based adhesive (curing agent: isocyanate) was dried at a thickness of 5 μm.
Apply in an oven to reach the maximum plate temperature of 150
C., and dried immediately by heating to 60 ° C. for 60 seconds, and immediately thereafter, a 50 μm-thick copolyester resin film 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 copolymerized polyester resin film used was a polyester resin obtained by copolymerizing PET with cyclohexane dimethanol as a comonomer, toned in brown, extruded into a film having a thickness of 50 μm, and subjected to satin embossing. Things.

Example 2 A copolymerized polyester resin film was added to 100 parts by weight of a polyester resin obtained by copolymerizing PET with cyclohexanedimethanol as a comonomer.
Example 1 Except that 30 parts by weight of an amorphous polyester resin having a melting point of 150 ° C. were blended, toned to a light gray color, extruded into a film having a thickness of 80 μm, and then subjected to grain embossing. This is the same condition as. Example 3 A SUS430 steel plate having a thickness of 0.45 mm is subjected to a coating type chromate treatment, and a two-component polyurethane resin-based adhesive (curing agent: isocyanate) is applied so as to have a dry film thickness of 5 μm. Ultimate plate temperature is 140 ° C
Was dried by heating for 60 seconds, and immediately thereafter, an 80 μm-thick copolyester resin film was laminated thereon and cooled with water. Here, the copolymerized polyester resin film used is a polyester resin obtained by copolymerizing cyclohexane dimethanol and isophthalic acid as a comonomer in PET, toned in black, extruded into a film having a thickness of 80 μm, and then formed by embossing. It has been subjected to.

The embossed tinted film-laminated steel sheet according to the present invention has an excellent embossed appearance,
Even if the film is folded at 80 degrees, no cracking of the coating film occurs.
The hardness was represented by B in pencil hardness, and the film did not peel off even when subjected to a 4 mm R square tube drawing process (wrinkle presser 100 kg, drawing speed 10 mm / sec, drawing depth 20 mm), and no handling scratch was observed.

[0013]

As described above, the embossed tinted film-laminated steel sheet of the present invention has a higher film hardness than a PVC steel sheet, and has an embossed appearance and excellent formability. It can be 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 Shin-ichi Steel Co., Ltd. Coating and Composite Materials Research Dept., Technology Research Laboratory F term (reference) 4F100 AA22 AB03A AB18 AK42B AK42J AK44G AK53 AL01B AL06 AR00C BA02 BA03 BA07 BA10A BA10B CA13 CB00 CB02 EH71 EJ65C EJ69 GB08 GB08 HB00B HB21B HB22 JB02H JK12 JL01 JL10B

Claims (3)

[Claims] 1. A film-laminated steel sheet having a colored resin film laminated on a steel sheet surface via an adhesive layer, wherein the colored resin film is made of a polyester resin obtained by copolymerizing polyethylene terephthalate resin with cyclohexane dimethanol as a comonomer. Characterized in that the colored resin film is embossed. 2. The embossed tinted film-laminated steel sheet according to claim 1, wherein the colored resin film is made of a polyester resin obtained by copolymerizing cyclohexane dimethanol and isophthalic acid as comonomers with a polyethylene terephthalate resin. 3. The embossed tinted film-laminated steel sheet according to claim 1, wherein a primer layer is provided between the steel sheet and the adhesive layer.