WO1997043119A1

WO1997043119A1 - Metallic sheet covered with highly clear resin and having work adhesiveness

Info

Publication number: WO1997043119A1
Application number: PCT/JP1997/001623
Authority: WO
Inventors: Takayuki Kaneko; Takashi Minamigi; Tetsuo Nakamoto
Original assignee: Toyo Kohan Co., Ltd.
Priority date: 1996-05-14
Filing date: 1997-05-14
Publication date: 1997-11-20
Also published as: CN1222881A; KR20000010887A; MY121257A; JP3090956B2; TW434145B; ID17403A; KR100366984B1; AU2788597A; CN1103283C

Abstract

A highly clear metallic sheet, in which a soft resin layer smoothes out irregularities on metallic sheet surfaces and printed layers, and which is excellent in work adhesiveness and clearness. Thus the metallic sheet covered with a resin comprises a substrate, which is composed of a metallic sheet (S) having a surface roughness represented by a center line average height (Ra) of above 0 m but at most 10 m, and at least on one side of which a coloring paint layer (D), soft resin layer (C), adhesive layer (B) and transparent resin film (A) are successively laminated in this order from the substrate.

Description

Specification

High-definition resin-coated metal sheet with excellent processing adhesion

The present invention relates to a resin-coated metal plate having excellent processing adhesion and sharpness. Background art

In recent years, the sophistication of designs has been pursued along with the sophistication of home appliances, audio equipment, kitchen appliances, and interior building materials. Upgrading of designs can be achieved by expressing processed shapes such as overhanging and deep drawing, and the design of the material surface, especially the printed pattern printed on the material surface, with high definition. For this reason, there is an increasing demand for a high-definition decorative metal plate having excellent adhesion to forming processes such as overhanging and deep drawing. Conventionally, as the metal substrate used for this type of high-definition decorative metal plate, since the surface roughness of the metal plate greatly affects the sharpness, the center line average roughness (R It is recommended to use a small polished plate of a). However, if a polished plate is to be obtained by rolling, the coefficient of friction is low due to the low roughness, and slippage occurs. Therefore, the productivity is extremely poor and the material must be expensive. Furthermore, when a polished plate is used as a metal substrate, the anchoring effect on the coating layer formed thereon is not sufficiently exerted, so that the processing adhesion of the coating layer becomes insufficient. On the other hand, in order to use an inexpensive metal plate with relatively large surface roughness as a metal substrate for a high-definition decorative metal plate, a transparent surface thermoplastic resin layer provided with an adhesive layer and a printed layer is made of metal. There has been proposed a high-definition laminated metal plate (Japanese Patent Laid-Open No. 6-23909) in which a laminated plate is heated and pressed by a finishing roll having a mirror surface.

However, in the case of pressure welding with a roll, it is inevitable that the surface thermoplastic resin layer will undulate to some extent due to heating, so that satisfactory high definition cannot always be obtained. Since the unevenness due to the light and shade pattern emerges as an unevenness on the outside of the transparent surface thermoplastic resin layer, there is a problem that sufficient sharpness cannot be obtained.

An object of the present invention is to provide an excellent processing adhesion in view of the above-mentioned problems in the prior art. In particular, it is an object of the present invention to provide a high-definition resin-coated metal plate having excellent clarity. Disclosure of the invention

According to the present invention, a metal plate having a surface roughness having a center line average roughness (R a) of more than 0 jw m and not more than 10 m is used as a substrate, and at least one surface of the substrate is colored sequentially from the substrate side. It is a resin-coated metal plate on which a paint layer, a soft resin layer, an adhesive layer, and a transparent resin film are laminated.

Further, in the resin-coated metal sheet of the present invention, the soft resin layer is a transparent resin, and a curing agent is added to the resin which is completely cured by post-heating, and a curing agent is added to such an extent that the resin is not completely cured by post-heating. A layer made of a soft resin obtained by applying a paint made of the added resin and then heating to reduce the degree of curing, or a layer coated with a polyester paint, or a film made of polyolefin It is characterized.

Further, in the resin-coated metal plate of the present invention, the adhesive layer contains a pigment, and the pigment is a metal powder, particularly an aluminum powder, or a mica powder. And

Furthermore, the resin-coated metal plate of the present invention is characterized in that the transparent resin film has a visually specular surface on both the front and back surfaces, and is a film in which polyethylene terephthalate is biaxially oriented. It is characterized by the following.

Furthermore, in the resin-coated metal plate of the present invention, a pattern printing layer, or a pattern printing layer and a base printing layer are provided between the adhesive layer and the soft resin layer; A pattern printing layer or a pattern printing layer and a base printing layer are provided between the transparent resin film and the transparent resin film. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic sectional view showing an example of the configuration of the resin-coated metal plate of the present invention. FIG. 2 is a schematic sectional view showing another example of the configuration of the resin-coated metal plate of the present invention. FIG. 3 is a schematic sectional view showing still another example of the configuration of the resin-coated metal plate of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

The highly vivid resin-coated metal plate of the present invention is provided with a soft resin layer between a colored paint layer applied on the metal plate and a transparent resin film having a mirror surface on both the top and bottom surfaces. As a result, the soft resin layer has the roughness of the metal plate and the unevenness of the colored paint layer that retains the unevenness based on the roughness of the metal plate, or the unevenness due to the printing pattern or the shading pattern. It can be deformed and absorbed, and on the other hand, can be heated and pressed without deforming the mirror surface of the transparent resin film that has a visually mirror surface on the outermost surface, and has extremely high sharpness, and Even when subjected to severe processing such as overhanging or deep drawing, it does not peel off at the interface between the constituent layers described above, and has excellent processing adhesion.

Hereinafter, the present invention will be described in detail.

FIGS. 1 to 3 show the configuration on one side of a resin-coated metal plate when a resin coating layer is provided. FIG. 1 corresponds to the invention of claim 1, wherein A is a transparent resin film, B is an adhesive layer, C is a soft resin layer, D is a colored paint layer, and S is a metal plate.

In FIG. 1, A is a transparent resin film, which constitutes the outermost layer of the resin-coated metal plate. The transparent resin film is formed by an extrusion method, a calendar method, a casting method, or the like, or by stretching in a uniaxial or biaxial direction after casting. Having a visual mirror surface with a surface roughness of 5 m or less at Ra max after film formation is one of the indispensable factors in obtaining the highly vivid resin-coated metal plate of the present invention. It is. If the surface roughness after deposition exceeds 5 m at R amax, irregular reflection occurs on the surface of the film, and the sharpness is impaired.

The transparent resin film preferably has a thickness of 5 to 100, more preferably a lower limit thickness of 12; im, and a more preferred upper limit thickness of 80 jam. When the thickness of the transparent resin film is less than 5 / m, the sharpness of the resin-coated metal plate as a whole is poor, and the film laminating work becomes extremely difficult. On the other hand, when it exceeds 100 111, the processing adhesion of the resin-coated metal plate becomes poor.

The transparent resin film A has a film made of polyester, polyester resin, polyvinyl alcohol, polypropylene, non-plasticized or plasticized vinyl chloride resin, polymethylpentene, cellulose triacetate, cellulose diacetate, or the like. And stabilizers and plasticizers may be added as needed to such an extent that sharpness is not lost. Examples of the polyester film include polyethylene terephthalate film and a film formed from a copolymerized polyester resin mainly composed of ethylene terephthalate units. In particular, polyethylene terephthalate is biaxially oriented. The resulting film is practically preferable as the transparent resin film used for the high-definition resin-coated metal plate of the present invention.

In order to improve the scratch resistance and slipperiness when handling the above-mentioned resin-coated metal plate and in forming, silicon-based, fluorine-based, acrylic-based, and melamine are applied to the outermost layer of the transparent resin film A. It is preferable to form a baking type or urethane type baking type or UV curing type coating layer of 0.1 to 50 m as a top coat. A more preferred lower limit thickness of this topcoat is 0.3, and a more preferred upper limit thickness is 30 m. If it is less than 0, the interference color becomes remarkable, and the scratch resistance deteriorates. On the other hand, if it exceeds 50 / zm, the workability is reduced and the economy is poor.

In FIG. 1, B is an adhesive layer. The adhesive includes a polyester-based, acryl-based, urethane-based, epoxy-based, or melamine-based resin as a main component. In addition, an adhesive having an adhesive effect such as a silane coupling agent may be used in combination.

This adhesive layer may be transparent, or may be a layer to which a pigment is added in order to enhance the design of the colored paint layer provided as a lower layer of the adhesive layer. Either organic or inorganic pigments can be used as a pigment to be contained in the adhesive. Particularly, when a so-called metallic color tone having a metallic luster is imparted to the adhesive layer, a paint may be used. It is preferable to use a pigment made of a metal powder colored or non-colored, particularly an aluminum powder or a mica powder.

The content ratio of these pigments is preferably in the range of 1 to 30% by weight, more preferably 3 to 20%, based on the solid content of the adhesive resin. If the content is less than 1%, the color tone (metallic luster) due to the pigment cannot be obtained, and if it exceeds 30%, the pigment-containing adhesive layer becomes brittle, resulting in poor processing adhesion when subjected to severe processing.

The shape of these pigment particles may be spherical or scale-like, and the particle size is flat. The average particle size is preferably in the range of 0.1 to 90, more preferably 1 to 80 m. If the average particle size is less than 0.1 m, the metallic color tone is poor, and if it exceeds 100 m, the sharpness is reduced.

The thickness of the above adhesive layer is preferably in the range of 1 to 5 O ^ m, more preferably 3 to 30 m. When the thickness of the adhesive layer is less than 1 / m, the boiling water resistance and processing adhesion are poor, and when the pigment is added, the pigment is difficult to be uniformly dispersed in the paint. On the other hand, if it exceeds 50 wm, it will be economically disadvantageous, and if a pigment is added, the surface appearance will be poor at the time of heating due to the effect of the residual solvent contained in the adhesive, and the sharpness will be reduced I do.

In FIG. 1, C is a soft resin layer, which is an important component for imparting excellent processing adhesion and high definition in the present invention. In the present invention, when a rough metal plate is used, when a colored paint applied on the metal plate is locally applied with an uneven thickness and has irregularities, or when a pattern and / or Even when a transparent resin film provided with an evening printing layer (which forms indentations and projections inevitably) is laminated on a metal plate, the soft resin layer C can absorb these irregularities.

That is, the soft resin layer C is used to prevent the unevenness due to the roughness of the metal plate, the unevenness of the colored paint layer, the unevenness of the print layer, etc. from rising to the surface of the transparent resin film Α. The irregularities are absorbed. If irregularities come to the surface of the transparent resin film A, irregular reflection is caused, thereby deteriorating the sharpness.

The soft resin layer C is deformed by the pressing force applied at the time of lamination, and prevents the surface of the transparent resin film A from being deformed by unevenness of the metal substrate, the colored paint layer, or the printed layer.

On the other hand, even if severe processing such as overhanging or deep drawing is performed on the resin-coated metal sheet, excellent processing adhesion that does not cause peeling at the interface of the soft resin layer C is also required.

In view of the above-mentioned required properties, the soft resin layer of the present invention includes, for example, a resin in a state where two-component mixed-curable resin is incompletely cured (uncured state). That is, a resin that is completely cured by post-heating after adding a curing agent A layer made of a soft resin obtained by adding a hardening agent to such an extent that the hardening is not completely performed, followed by heating and incompletely hardening is suitable as the soft resin layer.

Alternatively, a layer of a film made of a soft resin is also preferably used. These soft resin layers may be transparent layers, or may be opaque or translucent layers by adding a pigment.However, in order to make use of the design of the surface treatment layer provided below, it is necessary to use a transparent layer. It is preferable that the layer is a simple layer.

When the soft resin layer C is composed of an incompletely cured resin, the resin used includes a resin mainly composed of polyester, acrylic, urethane, epoxy, or melamine. When used as a main component, extremely excellent processing adhesion and sharpness are obtained, which is preferable. When a polyester resin is used, a urethane resin is used as a curing agent, and a curing agent is mixed at a ratio of 0.5 to 15% by weight with respect to 100% by weight of the polyester resin to form on a metal substrate. After being applied on the surface treatment layer, it is heated to a half-hardening temperature by heating at 230 to 280 "C for 0.3 to 2 minutes. When the curing agent is less than 0.5% by weight, Insufficient working adhesion to metal plate On the other hand, when the amount of the curing agent is more than 15% by weight and not more than 20% by weight, excellent working adhesion can be obtained, but the curing of the resin becomes large. When the curing agent exceeds 20% by weight, the resin is excessively hardened and becomes brittle, and the processing adhesion decreases.

When the soft resin layer is composed of a soft resin film, the resin film used is a film made of a polyester resin blended with an elastomer to soften the resin, carboxyl group, hydroxyl group, hydrolyzable group, acid anhydride, etc. A film made of a polyolefin resin modified by containing at least one kind of functional group in the molecule, a film made of a polyvinyl chloride resin softened by adding a known plasticizer, and the like. A film made of a polyolefin resin or a film made of a polyvinyl chloride resin is preferable as the soft resin layer C of the resin-coated metal plate of the present invention. The thickness of the soft resin layer C is preferably in the range of 10 to 100, more preferably 20 to 70 / zm. If the thickness is less than 10 m, the unevenness of the metal plate and the Z or print layer cannot be completely absorbed, and the sharpness of the resin-coated metal plate as a whole deteriorates. On the other hand, if it exceeds 100 m, the surface hardness of the resin-coated metal plate as a whole The degree and processing adhesion are reduced.

When a soft resin film is used as the soft resin layer C, the upper layer or lower layer (or both upper and lower layers) of the soft resin film is subjected to an anchor treatment with a silane coupling agent or the like, and the resin (film) is laminated. ) It is also possible to improve the adhesion between the layers.

In FIG. 1, D is a colored paint layer. This colored paint layer is a layer for constituting a colored layer as a design. The paint resins used include those containing polyester, acrylic, urethane, epoxy, or melamine as a main component, but especially when polyester resin is the main component. Excellent processing adhesion is obtained, which is preferable. As the pigment contained in this coating material, any of known organic and inorganic pigments can be used.

The content ratio of the pigment is preferably in the range of 1 to 30% by weight, more preferably 3 to 20%, based on the solid content of the coating resin. If the content is less than 1%, the color tone due to the pigment cannot be obtained, and if it exceeds 30%, the color paint layer becomes brittle and the processing adhesion becomes poor when severe processing is performed.

The shape of the particles of these pigments may be spherical or scale-like, and the average particle size is preferably in the range of 0.1 to 100 m, more preferably 1 to 80 m. If the average particle size is less than 0.1, it is extremely difficult to handle. If the average particle size exceeds Ι 塗装塗装塗装, the paintability becomes poor and the sharpness is reduced.

The thickness of the coloring paint layer D containing the pigment is preferably in the range of 1 to 60 zm, and more preferably 3 to 30. If the thickness of the colored paint layer D is less than 1 m, the hiding by the pigment is incomplete. On the other hand, if it exceeds 60 m, it is economically disadvantageous. Further, the colored paint layer D includes those composed of two or more layers. That is, in order to improve the corrosion resistance of the metal substrate, a metal substrate formed as a multilayer having an undercoat layer containing an anti-pigment is also included.

In FIG. 1, S is a metal plate as a substrate. This metal sheet includes steel sheet, stainless steel sheet, zinc-plated steel sheet, alloy zinc-plated steel sheet, composite zinc-plated steel sheet, nickel-plated steel sheet, and known chromic acid treatment, chromic phosphate treatment, Tin-free steel, plated steel sheet subjected to chemical treatment such as electrolytic chromic acid treatment This includes surface-treated steel sheets that have been subjected to direct chemical treatment on the surface of steel sheets such as aluminum alloy sheets, non-ferrous metal sheets such as aluminum alloy sheets and copper sheets, and non-ferrous metal sheets obtained by subjecting these non-ferrous metal sheets to the above-mentioned chemical conversion treatment.

Further, in the present invention, it is essential that the metal plate has a surface roughness whose center line average roughness (R a) is more than 0 m and not more than 10 tm. Metal plate

When a mirror surface having Ra of 0 m is used, the anchor effect on the colored paint layer D formed on the metal plate S cannot be obtained, and the processing adhesion becomes insufficient. In addition, as described above, the production of a metal plate having a mirror surface with Ra of 0 m is extremely poor in productivity and inevitably becomes an expensive material.

On the other hand, when the Ra of the above metal plate exceeds 10 m, it becomes impossible for the soft resin layer B to completely absorb the unevenness due to the rough surface of the metal plate, and the sharpness deteriorates. A more preferable range of Ra is 0.:! To 2 jum.

FIG. 2 corresponds to the invention of claim 12, and is the same as the constituent layer of FIG. 1 except that a pattern and / or a printing layer are provided between the adhesive layer B and the soft resin layer C. . FIG. 3 corresponds to the invention of claim 13, and is the same as the constituent layer of FIG. 1 except that a pattern and / or a printing layer are provided between the adhesive layer B and the transparent resin film A. You.

Next, the method for producing the high-definition resin-coated metal plate of the present invention will be described.

(1) Soft resin layer formation

In the case of the coated metal plate shown in FIG. 1 (described in claim 1), the surface of the metal plate S is coated once or twice with a paint containing a pigment by a roll coating method or the like, and the colored paint layer D is formed. Let it form. If you want a thicker paint layer, increase the number of coatings. Then, a soft resin layer C is further provided thereon. When the soft resin layer C is applied as a coating, apply a hardening agent to the resin that is completely cured by post-heating, and apply a resin coating to which a curing agent is added to such an extent that the post-heating does not completely cure the resin. After drying, heat it afterwards. When the soft resin layer C is a film made of a soft resin, the soft resin is extruded and formed into a film and laminated, or the coated metal plate on which the colored paint layer D is formed is heated to remove the soft resin. The formed film is brought into contact with the heated coated metal plate, sandwiched between a pair of laminating rolls, pressed and laminated to form a soft resin layer. C is formed.

(2) Preparation of resin film for coating

In the case of the coated resin film shown in FIG. 1 (described in claim 1), the transparent resin film A is coated with a metal powder, particularly an aluminum powder or a mica powder, or an additive free of pigment. Apply and dry to form adhesive layer B.

In the case of a coated resin film as shown in FIG. 2 (described in claim 12), a transparent resin film A is coated with a metal powder, particularly an aluminum powder or a mica powder, or an additive free of pigment. After applying and drying to form the adhesive layer B, the pattern printing layer P2, or the pattern printing layer P2 and the base printing layer P1 are applied.

In the case of the coated resin film shown in FIG. 3 (described in claim 13), after forming the pattern printing layer P2 or the pattern printing layer P2 and the base printing layer P1 on the transparent resin film A, As described above, a pigment made of a metal powder, particularly an aluminum powder or a mica powder, is applied with or without an added adhesive, and dried to form an adhesive layer B.

(3) Lamination

After heating the soft resin-coated metal plate obtained as described above, the coating resin film is brought into contact with the soft resin-coated metal plate, sandwiched between a pair of laminating rolls and pressed, and further heated. Then, it is sandwiched between a pair of mirror rolls, pressurized, and cooled.

Roll pressure when crimping put sandwiched by the laminate roll is preferably in the range of l SO kgZcm ^2, more preferably 5~60 kg / cm ^2. If the roll pressure is less than 5 kg / cm ² , the coated resin film will not be pressed uniformly in the width direction of the metal plate, and the surface appearance (sharpness) will vary. On the other hand, if it exceeds 60 kgZcm ² , the laminator rolls will be significantly worn, and the laminating rolls will have to be replaced frequently, and the productivity will decrease.

(Example 1)

Formation of soft resin layer

Thickness: 0.5mm, Plating amount: 12 gZm ² , Chromium coating amount (as chromium): 0.08 gZdm ² , Average surface roughness Ra: 0.55 m 12 m of a copolyester paint having a white pigment was applied to the coated steel sheet and dried. Further, a mixture of 100 parts by weight of a transparent polyester resin and 3 parts by weight of a resin resin as a curing agent was applied and mixed, dried and then baked with 260 for 1 minute. A metal plate having a soft resin layer was prepared.

Preparation of resin film for coating

Acrylic resin was applied as a top coat in advance to a thickness of 3 m. Thickness: 25 fi m. Surface roughness Ra: 0.8 m Average grain size on a biaxially stretched transparent polyethylene terephthalate film. Diameter: 3 m of a polyester-based adhesive containing 15 parts by weight of a pigment made of scale-like aluminum powder colored in golden to the resin solids, applied in a thickness of 10 m and dried. Then, a resin film for coating was obtained. Lamination

The metal plate having the soft resin layer is heated at 200, brought into contact with the resin film for coating, and pressed and pressed with a pair of laminating rolls at a pressing force of ²⁰ kg Z cm ^2. Then, at a temperature of 200, it was sandwiched between a pair of mirror-finished rolls, pressurized and cooled to prepare a resin-coated metal plate.

Evaluation

The characteristics of the resin-coated metal plate obtained as described above were evaluated according to the following evaluation criteria.

i) Clearness

Using a portable clarity gloss meter PGD-4 type (manufactured by Japan Color Research Institute), the image clarity, that is, the clarity of the specular image reflected on the decorative surface was measured. The higher the measured value, the better the sharpness.

i i) Working adhesion

For the processing adhesion, the following two tests were performed, and the measurement results of both tests were comprehensively judged and the quality was evaluated.

a) Erichsen overhang test

After a flaw reaching the metal substrate was formed in a grid pattern on the resin-coated surface of the resin-coated metal plate with a power knife, a 8 mm overhang was applied from the back surface using an Erichsen overhang tester. After that, it was heated at 100 for 1 hour, and the peeled state of the resin after heating was visually evaluated. did.

b) Cup deep drawing test

After deep-drawing the resin-coated metal plate in a cup shape with a drawing ratio of 2.2 using a Yamada-type deep drawing tester, the flaw reaching the metal substrate with a cutter knife on the resin-coated surface forming the cup cylinder Were formed at 5 mm intervals. Thereafter, the resin was heated at 100 for 1 hour, and the peeled state of the resin after heating was visually evaluated.

The numerical value representing the sharpness of the resin-coated metal plate obtained as described above was 0.8, which was excellent, and the processing adhesion was also excellent.

(Comparative Example 1)

12 xm of a copolyester-based paint having the same white pigment as in Example 1 was applied to the same galvanized steel sheet as in Example 1, and dried. Further, 100 parts by weight of a transparent polyester resin and 17 parts by weight of a urethane resin as a curing agent were added and mixed, and the mixture was applied 10 m, dried, and baked at 280 for 0.3 minutes. A fat layer was formed. On this resin layer, the same resin film for coating as in Example 1 was laminated under the same conditions as in Example 1 to prepare a resin-coated metal plate. The properties of the resin-coated metal plate thus obtained were evaluated by the same evaluation method as that shown in Example 1. As a result, the processing adhesion of the resin-coated metal plate was excellent, but the numerical value representing the sharpness was 0.1, which was poor.

(Example 2)

Formation of soft resin layer

Sheet thickness: 0.5 mm, Plating amount: 14 gZm ² , Chromate coating amount (as chromium): 0.0 7 g / d Electrogalvanized steel sheet with average surface roughness Ra: 8.5 / zm Then, 5 m of a copolyester paint having a white pigment was applied thereto and dried. The coated metal plate is heated to ²⁰⁰ , and a transparent maleic acid-modified polyethylene film having a thickness of 100 / m is brought into contact with the coated metal plate. Using a pair of laminating rolls, a pressing force of ²⁰ kg / cm ² is applied. , And pressed and cooled to prepare a metal plate having a soft resin layer.

Preparation of resin film for coating

Thickness of a fluorine-based resin previously applied to a thickness of 1 zzm as a top coat: 20 m, surface roughness Ra: 0.8 am, a biaxially stretched transparent polyethylene terephthalate film, and a pigment composed of flake-like aluminum powder with an average particle size of 3 // m, based on the resin solid content. Then, 12 wm of a copolyester adhesive paint containing 20 parts by weight was applied and dried to obtain a resin film for coating.

Lamination

The metal plate provided with the soft resin layer is heated to 200, brought into contact with the coating resin film, and pressed and crimped with a pair of laminating rolls at a pressing force of 20 kgZcm ^2. At a temperature, it was sandwiched between a pair of mirror-finished rolls, pressurized, and cooled to produce a resin-coated metal plate.

The characteristics of the resin-coated metal plate thus obtained were evaluated by the same evaluation method as that shown in Example 1. As a result, the numerical value representing the sharpness of the resin-coated metal plate was 1.0, which was excellent, and the processing adhesion was also excellent.

(Comparative Example 2)

The same electrogalvanized steel sheet as in Example 2 was coated with 5 m of a copolyester-based paint having the same white pigment as in Example 2 and dried. Heating the coated metal plate 200 is brought into contact with a polyethylene film having a thickness of 100 xm, 1 pair of lamination - using trawl, 20 KgZcm scissors dipped and pressed and cooled in the ^second pressure, transparency resin coating A metal plate was created. A resin film for coating similar to that in Example 1 was laminated on this transparent resin-coated metal plate under the same conditions as in Example 1 to prepare a resin-coated metal plate. The characteristics of the resin-coated metal plate thus obtained were evaluated by the same evaluation method as that shown in Example 1. As a result, the numerical value indicating the sharpness of the resin-coated metal plate was 0.9, which was excellent, but the processing adhesion was poor.

(Example 3)

Formation of soft resin layer

Plate thickness: 0.5mm, Plating amount: 15 g Zm ² , Chromate coating amount (as chromium): 0.06 g / dm ² , Average surface roughness Ra: 0.1% 10 m of a copolyester-based paint having a red pigment was applied to a steel sheet and dried. The coated metal plate was heated to 200, contacting the transparent polychlorinated Pini Rufirumu thickness 50, using a pair of laminating port one le, of 20 kgZcm ² pressure A metal plate having a soft resin layer was prepared by being sandwiched by pressure, pressed and cooled.

Preparation of resin film for coating

Thickness of melamine resin applied as a top coat beforehand in a thickness of 4: 2

5 111, a pigment composed of scale-like mica powder with an average particle size of 2 jam was applied to a transparent polyethylene terephthalate film biaxially stretched and oriented with a surface roughness of 1 ^ 3: 0.8 / im. 10 parts by weight of a copolyester-based adhesive paint containing 20 parts by weight of the resin were applied and dried to obtain a resin film for coating.

The metal plate on which the soft resin layer is formed is heated to 200, brought into contact with the coating resin film, and sandwiched and pressed with a pair of laminating rolls with a pressing force of 20 kgZcn ^. At a temperature of 200 ° C, it was sandwiched between a pair of mirror rolls, pressurized and cooled to produce a resin-coated metal plate.

The characteristics of the resin-coated metal plate thus obtained were evaluated by the same evaluation method as that shown in Example 1. As a result, the numerical value indicating the sharpness of the resin-coated metal plate was 0.9, which was excellent, and the processing adhesion was also excellent.

(Comparative Example 3)

Sheet thickness: 0.5 mm, Plating amount: 15 g / m ² , Chromate coating amount (as chromium): 0.06 g / dm 'Electro-galvanized steel sheet with average surface roughness Ra 11.5 urn Then, 10 m of a copolyester-based paint having a red pigment was applied thereto and dried. Further, a transparent polyvinyl chloride film similar to that in Example 3 was laminated thereon under the same conditions as in Example 3 to prepare a resin-coated metal plate. The same resin film for coating as in Example 3 was laminated on this resin-coated metal plate under the same conditions as in Example 3 to prepare a resin-coated metal plate. The characteristics of the resin-coated metal plate thus obtained were evaluated by the same evaluation method as that shown in Example 1. As a result, the workability of the resin-coated metal plate was excellent, but the numerical value representing the sharpness was 0.1, which was poor.

(Example 4)

To the same steel sheet with electrogalvanized steel as in Example 1, 5 // m of a copolymer polyester-based paint having a brown pigment was applied and dried. Further, a transparent soft resin layer having a thickness of 10 m made of the same polyester resin as in Example 1 was formed thereon in the same manner as in Example 1. Next, apply a silicone resin as a top coat on one side with a thickness of 2 zm. Pre-applied thickness: 25 ^ 1 ^ Surface roughness &: 0.8 coating of silane coupling material on one side of another transparent biaxially oriented polyethylene terephthalate film of 0.8 xm After drying, 30 m of transparent copolyester-based adhesive was applied and dried, and a 1 im thick wood grain print was performed with a polyester-based ink. The coating resin film thus obtained was laminated on the metal plate on which the soft resin layer was formed under the same conditions as in Example 1 to produce a resin-coated metal plate. The characteristics of the obtained resin-coated metal plate were evaluated by the same evaluation method as that shown in Example 1. As a result, the numerical value representing the sharpness of the resin-coated metal plate was 0.8, which was excellent, and the processing adhesion was also excellent.

(Example 5)

5 μπι of a copolymer polyester paint having a brown pigment was applied to the same electroplated steel sheet as in Example 1 and dried. Further, a transparent soft resin layer having a thickness of 10 m made of the same polyester resin as in Example 1 was formed thereon in the same manner as in Example 1. Next, the other side of the transparent biaxially stretched and oriented polyethylene terephthalate film as in Example 4 in which the same top coat as in Example 4 was applied to one side was subjected to pattern printing with a polyester ink, Subsequently, solid printing was performed (total thickness of the printing layer: 7 zm) .The same silane coupling material treatment as in Example 4 was performed on this printing layer, and then the same transparent printing as in Example 4 was performed. A resin film for coating obtained by applying a copolymer polyester adhesive by 30 m and drying was laminated on the metal plate on which the soft resin layer was formed under the same conditions as in Example 1, and resin coating was performed. The properties of the resin-coated metal plate thus obtained were evaluated by the same evaluation method as that shown in Example 1. As a result, the sharpness of the resin-coated metal plate was evaluated. The numerical value of 0.8 is excellent, showing excellent processing adhesion. Availability on the stomach. Industry

The resin-coated metal plate of the present invention is provided with a soft resin layer between the colored paint layer and the adhesive layer, or between the colored paint layer and the printed layer, so that unevenness due to the roughness of the metal plate, unevenness of the colored paint layer, Alternatively, it is possible to absorb the unevenness of the printing layer, thereby obtaining excellent sharpness. In addition, the soft resin layer has excellent adhesiveness with the coloring paint layer, the printing layer, and the adhesive layer, and the adhesive layer and the printing layer have excellent adhesiveness with the transparent resin film. Even when severe processing such as deep drawing is performed, no exfoliation occurs at the interface between the constituent layers described above, and excellent processing adhesion is exhibited.

Claims

The scope of the claims

1. A metal plate having a surface roughness whose center line average roughness (Ra) exceeds 0 im and is 10 jLtm or less is used as a substrate. At least on one side of the substrate, a colored paint layer and a soft layer are sequentially formed from the substrate side. A resin-coated metal plate on which a resin layer, an adhesive layer, and a transparent resin film are laminated.

2. The resin-coated metal plate according to claim 1, wherein the soft resin layer is a transparent resin.

3. The resin-coated metal plate according to claim 1, wherein the soft resin layer is an uncured mixed resin layer.

4. The resin-coated metal plate according to any one of claims 1 to 3, wherein the soft resin layer is a layer coated with a polyester resin.

5. The resin-coated metal plate according to claim 1, wherein the soft resin layer is a film made of polyolefin.

6. The resin-coated metal plate according to claim 1, wherein the adhesive layer contains a pigment.

7. The resin-coated metal plate according to claim 6, wherein the pigment is a metal powder.

8. The resin-coated metal plate according to claim 7, wherein the pigment is aluminum powder.

9. The resin-coated metal plate according to claim 7, wherein the pigment is mica powder.

10. The resin-coated metal plate according to claim 1, wherein the transparent resin film has a mirror surface on both front and back surfaces.

1 1. The resin-coated metal plate according to claim 1, wherein the transparent resin film is a film in which polyethylene terephthalate is biaxially stretched and oriented.

12. The resin-coated metal plate according to claim 1, wherein a pattern printing layer, or a pattern printing layer and a color printing layer are provided between the adhesive layer and the soft resin layer. .

13. The resin-coated metal according to claim 1, wherein a pattern printing layer, or a pattern printing layer and a base printing layer are provided between the adhesive layer and the transparent resin film.