Decorative steel panel and producing method thereof, decorative steel panel using decorative steel panel and producing method thereof

Abstract

To provide a decorative steel panel having high adhesion positional accuracy between a steel sheet and substrate, capable of suppressing generation of burr on a panel side surface, as well as, peeling between the steel sheet and substrate during handling, and capable of having high absorption holding power to a magnet.SOLUTION: A decorative steel panel 10 has at least a steel plate 1, an adhesive layer A2, and a substrate 3 in this order, wherein the adhesive layer A is composed of a cured product of an adhesive a selected from the group consisting of a water-based two-component curing adhesive, a solvent-free two-component curing adhesive, and a water-based rubber type adhesive.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a steel sheet panel used in the manufacture of a decorative sheet (decorative steel sheet panel) having a steel sheet and capable of attracting and holding a magnet on its surface. [Background technology]

[0002] Decorative panels, which have a decorative layer on the surface of a non-flammable or wooden base material, have traditionally been used for the surface decoration of building interiors and attached furniture, etc. Among them, decorative panels in which a steel plate is provided between the decorative layer and the base material (referred to as decorative steel plate panels) are particularly useful, as they are capable of attracting and holding magnets on their surface.

[0003] Patent Document 1 discloses a decorative magnetic decorative building material that has a facing material (decorative layer), steel foil, and a non-combustible board or wooden board, and is capable of attracting and holding a magnet on the surface of the facing material side. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-36650 A Summary of the Invention [Problem to be solved by the invention]

[0005] Decorative steel panels are manufactured by cutting a composite material of a steel plate and a substrate, which is a non-combustible board or a wooden board, obtained by firmly bonding the steel plate and the substrate with an adhesive, into a desired size for the decorative panel. However, in order for the decorative steel plate panel to have a high adhesion force to a magnet, the thickness of the steel plate needs to be thick. However, if the thickness of the steel plate is thick, burrs are likely to occur on the cut surface, especially the cut surface of the steel plate, when the composite material is cut to the desired size to form the steel plate panel.

[0006] On the other hand, when a steel plate and a substrate, each having the same size in advance, are bonded with an adhesive to omit cutting of the composite material, if the bonding positions of the steel plate and the substrate are misaligned, the steel plate and the substrate are firmly bonded in a short time with the bonding positions misaligned, making it impossible to rebond the steel plate and the substrate, and the bonding position accuracy of the steel plate and the substrate decreases. Furthermore, if one tries to improve the rebonding property, peeling between the steel plate and the substrate becomes more likely to occur during handling.

[0007] The present disclosure has been made in consideration of the above-mentioned situation, and provides a steel sheet panel for decorative panels that has high accuracy in the positioning of the steel sheet and the substrate, can suppress the occurrence of burrs on the side surfaces of the panel and peeling between the steel sheet and the substrate during handling, and has a high adhesive retention force against magnets.

[0008] The present disclosure also provides a manufacturing method for a steel sheet panel for decorative panels, which enables adjustment of the lamination position of the steel sheet and the substrate, thereby achieving high lamination position accuracy, and does not require cutting after joining the steel sheet and the substrate.

[0009] The present disclosure further provides a decorative steel panel using the above-mentioned steel sheet panel for decorative boards, and a method for manufacturing a decorative steel sheet panel including the above-mentioned method for manufacturing the steel sheet panel for decorative boards. [Means for solving the problem]

[0010] The present disclosure includes the following embodiments. [1] A steel plate panel for decorative panels, comprising at least a steel plate, an adhesive layer A, and a substrate, in that order, wherein the adhesive layer A is composed of a cured product of adhesive a selected from the group consisting of a water-based two-component curing adhesive, a solventless two-component curing adhesive, and a water-based rubber adhesive. [2] The steel sheet panel for decorative panels according to the above [1], wherein the adhesive a is an isocyanate-curing two-component adhesive. [3] The coating amount of the adhesive layer A is 20 g / m2 in solid content. 2 ~200g / m 2 The steel sheet panel for decorative plates according to the above [1] or [2]. [4] The steel sheet panel for decorative panels according to any one of the above [1] to [3], wherein the thickness of the steel sheet is 0.2 mm to 1.0 mm. [5] The steel sheet panel for decorative panels according to any one of the above [1] to [4], further comprising a moisture-proof layer. [6] A decorative steel panel comprising the steel sheet panel for decorative board according to any one of [1] to [5] above, and a decorative layer provided on the steel sheet of the steel sheet panel for decorative board. [7] A method for producing a steel sheet panel for decorative board according to any one of [1] to [5] above, comprising: a lamination step of applying adhesive a to one side of a steel sheet to form a precursor layer of the adhesive layer A, and laminating the substrate to the precursor layer directly or through another layer; or a lamination step of applying adhesive a to one side of a substrate to form a precursor layer of the adhesive layer A, and laminating the steel sheet to the precursor layer directly or through another layer; wherein the adhesive a is selected from the group consisting of an aqueous two-component curing adhesive, a solventless two-component curing adhesive, and an aqueous rubber adhesive. [8] The method for producing a steel sheet panel for decorative plates according to the above [7], wherein the steel sheet and the substrate are bonded together via the precursor layer, and the time required for the precursor layer to harden and become an adhesive layer A is 5 minutes or more under an environment having a temperature of 5°C to 40°C and a humidity of 20% RH to 100% RH. [9] A method for manufacturing a steel sheet panel for decorative boards as described in [7] or [8] above, which includes a preparation step of preparing the steel sheet and the substrate having the same dimensions and shape as the steel sheet in a planar view prior to the lamination step.

[10] A method for manufacturing a steel sheet panel for decorative boards as described in [7] or [8] above, comprising a preparation step of preparing the steel sheet and the substrate larger than the steel sheet in a planar view prior to the bonding step.

[11] The method for producing a steel sheet panel for decorative board according to any one of [7] to

[10] above, which does not include a cutting step of cutting a composite material obtained by bonding the steel sheet and the substrate via the adhesive layer A after the lamination step.

[12] A manufacturing method for producing the decorative steel plate panel described in [6] above, comprising a steel plate panel manufacturing process for manufacturing a steel plate panel using the manufacturing method for a steel plate panel for decorative plates described in any one of [7] to

[11] above, and a decorative layer forming process for providing a decorative layer on the surface of the steel plate.

[13] A method for manufacturing a decorative steel panel as described in

[12] above, which does not include a cutting step of cutting a composite material having a decorative layer provided on the surface of the steel plate side of the steel plate panel. Effect of the Invention

[0011] The steel sheet panel for decorative panels disclosed herein has high accuracy of lamination positioning between the steel sheet and the substrate, can suppress the occurrence of burrs on the side of the panel and peeling between the steel sheet and the substrate during handling, and has high adhesive retention force against magnets.

[0012] In addition, according to the manufacturing method of the steel sheet panel for decorative board of the present disclosure, by bonding the steel sheet and the substrate with a specific adhesive, it is possible to position or re-bond the steel sheet and the substrate before the curing reaction of the adhesive is completed. This makes it possible to improve the bonding position accuracy of the steel sheet and the substrate, and also makes it unnecessary to cut the steel sheet and the substrate after bonding, thereby suppressing the generation of burrs on the cut surface. [Brief description of the drawings]

[0013] [Figure 1] 1 is a schematic top view, a cross-sectional view along line XX, and a cross-sectional view along line YY showing an example of a steel sheet panel for decorative board according to the present disclosure. FIG. [Diagram 2] FIG. 1 is a schematic cross-sectional view showing an example of a steel sheet panel for decorative board according to the present disclosure. [Diagram 3] 1 is a schematic top view, a cross-sectional view along line XX, and a cross-sectional view along line YY showing an example of a steel sheet panel for decorative board according to the present disclosure. FIG. [Figure 4] 1 is a schematic top view, a cross-sectional view along line XX, and a cross-sectional view along line YY showing an example of a steel sheet panel for decorative board according to the present disclosure. FIG. [Diagram 5] 1 is a schematic top view, a cross-sectional view along line XX, and a cross-sectional view along line YY showing an example of a steel sheet panel for decorative board according to the present disclosure. FIG. [Figure 6] 1 is a schematic top view, a cross-sectional view along line XX, and a cross-sectional view along line YY showing an example of a decorative steel sheet panel of the present disclosure. [Figure 7] 1 is a schematic top view, a cross-sectional view along line XX, and a cross-sectional view along line YY showing an example of a decorative steel sheet panel of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] I. Decorative steel panels (steel panels) The steel plate panel for decorative plates of the present disclosure (hereinafter may be referred to as the steel plate panel of the present disclosure) has at least a steel plate, an adhesive layer A, and a substrate, in this order, and the adhesive layer A is composed of a cured product of an adhesive selected from the group consisting of an aqueous two-component curing adhesive, a solventless two-component curing adhesive, and an aqueous rubber type adhesive.

[0015] 1(a) to (c) are schematic diagrams showing an example of a steel sheet panel of the present disclosure, where FIG. 1(a) is a schematic top view, FIG. 1(b) is a cross-sectional view taken along line XX in FIG. 1(a), and FIG. 1(c) is a cross-sectional view taken along line YY in FIG. 1(a). The steel sheet panel 10 of the present disclosure comprises at least a steel sheet 1, an adhesive layer A (reference numeral 2 in FIG. 1), and a substrate 3, in this order. The adhesive layer A (reference numeral 2 in FIG. 1) is composed of a cured product of an adhesive a selected from the group consisting of an aqueous two-component curing adhesive, a solventless two-component curing adhesive, and an aqueous rubber adhesive.

[0016] According to the present disclosure, the adhesive layer that bonds the steel plate and the substrate is composed of a cured product of a specific adhesive a, and by utilizing the long curing time of the specific adhesive a, the steel plate and the substrate can be aligned, re-attached, temporarily fixed, etc., until the adhesive a hardens and exerts a strong adhesive force. Therefore, the steel plate panel of the present disclosure is a panel with high accuracy of lamination position of the steel plate and the substrate. In particular, when the planar dimensions and shapes of the steel plate and the substrate are the same in advance, the deviation of the overlapping position of the periphery of the steel plate and the periphery of the substrate can be suppressed by re-attaching, etc. On the other hand, when the planar dimensions and shapes of the steel plate and the substrate are different, the effect of laminating the steel plate and the substrate with high accuracy so as to have a predetermined positional relationship can be more effectively achieved by repeatedly performing alignment, re-attaching, temporary fixing, etc.

[0017] Furthermore, if the thickness of the steel plate is increased to exert a high adhesive force on the magnet, burrs are more likely to occur on the cut surface of the panel, particularly on the cut surface of the steel plate, when the steel plate panel is cut to fit the size of the decorative steel plate panel. In contrast, the steel plate panel of the present disclosure has high lamination position accuracy and does not require cutting, so burrs can be suppressed from occurring on the side surface of the panel.

[0018] Furthermore, in the steel plate panel disclosed herein, the adhesive layer is composed of a cured product of a specific adhesive a, and the tackiness of the adhesive and its adhesion after curing can suppress peeling between the steel plate and the substrate during handling.

[0019] 1.Adhesive layer A The adhesive layer A in the steel sheet panel of the present disclosure is located between the steel sheet and the substrate, and is composed of a cured product of an adhesive a selected from the group consisting of a water-based two-component curing adhesive, a solventless two-component curing adhesive, and a water-based rubber adhesive. The adhesive layer A bonds the steel sheet and the substrate directly or via another layer.

[0020] Of the adhesives a, the two-component curing type aqueous two-component curing adhesive and the solventless two-component curing adhesive may be referred to as adhesive a1, and the one-component curing type aqueous rubber adhesive may be referred to as adhesive a2. Also, of the adhesives a used to form the adhesive layer A, the aqueous two-component curing adhesive and the aqueous rubber adhesive may be generally referred to as the aqueous adhesive.

[0021] The adhesive layer A is formed by applying an adhesive a selected from the group consisting of an aqueous two-component curing adhesive, a solventless two-component curing adhesive, and an aqueous rubber adhesive to form a coating film (precursor layer), and drying and curing the precursor layer over time. When the adhesive a is an aqueous adhesive, the adhesive layer A is composed of a cured product of the adhesive a from which the aqueous solvent has been removed.

[0022] (Adhesive A1) The adhesive layer A is preferably composed of a cured product of an adhesive a1 selected from the group consisting of an aqueous two-component curing adhesive and a solventless two-component curing adhesive. The adhesive a1 can ensure time until the coating film (precursor layer) of the adhesive a1 cures to become the strongly adhesive adhesive layer A, and during the time until the precursor layer cures to become the adhesive layer A, the steel plate or substrate can be moved on the precursor layer for alignment and positioning, making it possible to bond at a highly accurate position. In addition, the tackiness of the adhesive a1 and the adhesiveness exhibited by curing can suppress the occurrence of peeling between the steel plate and the substrate during handling.

[0023] Furthermore, by forming the adhesive layer A with the above-mentioned adhesive a1, peeling between the steel plate and the substrate due to warping of the steel plate and the substrate can be suppressed. When warping occurs due to the difference in material between the steel plate and the substrate, peeling is likely to occur between the steel plate and the substrate. In particular, if the thickness of the steel plate is increased so that the decorative steel plate panel can exert a high adhesion and holding force on the magnet, the warping of the steel plate and the substrate becomes large, making peeling more likely to occur between the steel plate and the substrate. In contrast, by using the above-mentioned adhesive a1, peeling between the steel plate and the substrate due to warping can also be suppressed.

[0024] The aqueous two-component curing adhesive and the solventless two-component curing adhesive include a base agent and a curing agent. The aqueous two-component curing adhesive may be an emulsion, a colloidal dispersion, or an aqueous solution in which water is used as a diluent. Examples of the base agent of the aqueous two-component curing adhesive include water-soluble substances such as polyvinyl alcohol, water-soluble ethylene-vinyl acetate copolymer, polyethylene oxide, aqueous acrylic resin, aqueous cellulose derivative, water-soluble polyester, and water-soluble epoxy resin; and aqueous emulsions such as polyvinyl chloride emulsion, urethane acrylic emulsion, polyurethane emulsion, silicon acrylic emulsion, polyester emulsion, vinyl acetate acrylic emulsion, ethylene vinyl acetate emulsion, urethane modified ethylene vinyl acetate copolymer emulsion, and vinyl copolymer emulsion. The base agent preferably has an acid group and / or a hydroxyl group.

[0025] The curing agent of the aqueous two-component curing adhesive may be a compound capable of forming a crosslinked structure with the main component. Such a compound may be, for example, a compound having two or more functional groups in the molecule that can react with an acid group and / or a hydroxyl group. Here, examples of the "functional group that can react with an acid group and / or a hydroxyl group" include, for example, an epoxy group, an oxazoline group, a melamine group, an aziridine group, a carbodiimide group, an isocyanate group, and the like. Specific examples of such a curing agent include polyisocyanate, a multifunctional epoxy resin, an oxazoline group-containing polymer, a polyamine resin, and an acid anhydride.

[0026] Examples of the solvent-free two-component curing adhesive include a solvent-free two-component curing adhesive that contains a resin selected from urethane resin, acrylic resin, etc. as a main component and a curing agent such as polyisocyanate. The curing agent may be any of the compounds exemplified as the curing agent for the aqueous two-component curing adhesive described above. The solvent-free two-component curing adhesive is substantially free of organic solvent, and the amount of organic solvent in the adhesive is 5% by mass or less, preferably 3% by mass or less, more preferably 1% by mass or less, and particularly preferably does not contain any organic solvent.

[0027] Among these, it is preferable that the adhesive a forming the adhesive layer A is an aqueous two-component curing adhesive. The viscosity of an aqueous two-component curing adhesive is relatively stable after mixing the two components, and water can be used to clean the adhesive application equipment after work, so that the adhesive is generally easy to work with.

[0028] Moreover, the adhesive a1 is preferably an isocyanate-curing two-liquid adhesive, and more preferably an isocyanate-curing adhesive containing polyisocyanate. In the isocyanate-curing two-liquid adhesive, the terminal OH group of the base agent reacts with the isocyanate to form a urethane bond with excellent water resistance and heat resistance by blending isocyanate as a curing agent with various base agents. The reaction proceeds at room temperature, and is excellent in that no special heating treatment is required. In addition, when a creep force occurs at the interface between the steel plate and the adhesive due to warping of the steel plate and the substrate, the cured product of the adhesive obtained by the reaction has excellent creep resistance and can suppress the occurrence of peeling between the steel plate and the substrate. Among them, it is more preferable that the aqueous two-liquid curing adhesive is an isocyanate-curing two-liquid adhesive from the viewpoint of obtaining a synergistic effect between the effect of the aqueous two-liquid curing adhesive described above and the effect of using isocyanate.

[0029] When the aqueous two-component curing adhesive is an isocyanate-curing two-component adhesive, examples of the main agent of the isocyanate-curing aqueous two-component adhesive include water-soluble substances such as polyvinyl alcohol, water-soluble ethylene-vinyl acetate copolymer, polyethylene oxide, aqueous acrylic resin, aqueous cellulose derivative, water-soluble polyester, water-soluble epoxy resin, etc.; aqueous emulsions such as polyvinyl chloride emulsion, urethane acrylic emulsion, polyurethane emulsion, silicon acrylic emulsion, polyester emulsion, vinyl acetate acrylic emulsion, ethylene vinyl acetate emulsion, urethane modified ethylene vinyl acetate copolymer emulsion, vinyl copolymer emulsion, etc. The main agent preferably has an acid group and / or a hydroxyl group, and more preferably has a hydroxyl group (OH group) at the terminal.

[0030] Examples of the isocyanate include polyisocyanates such as aromatic isocyanate compounds, aromatic aliphatic isocyanate compounds, aliphatic isocyanate compounds, alicyclic polyisocyanate compounds, and modified products thereof. These polyisocyanates may be used alone or in combination of two or more. More specifically, examples of the polyisocyanate include tolylene diisocyanate (TDI), diphenylmethane isocyanate (MDI), hexamethylene diisocyanate (HDI), xylylene diisocyanate (XDI), isophorone diisocyanate (IPDI), tris(isocyanate phenylmethane), tris(isocyanate phenyl) thiophosphate, and the like. Examples of the NCO modified products include adducts of the above compounds such as trimethylolpropane, HDI biuret, HDI trimer, IPDI trimer, and urethane prepolymers with isocyanate terminals. The amount of isocyanate to be blended is not particularly limited as long as the desired time for alignment, re-attachment, and the like can be secured; for example, the ratio of base material:isocyanate (parts by mass) can be 100:0.1 to 100:10.

[0031] When the solventless two-component curing adhesive is an isocyanate-curing two-component adhesive, the base resin may be a resin having a hydroxyl group (OH group) selected from urethane resin, acrylic resin, etc., and the isocyanate may be the above-mentioned polyisocyanate. The amount of isocyanate blended is not particularly limited as long as the desired time for enabling alignment, re-attachment, etc. can be secured, but for example, the base resin:isocyanate (ratio by mass) may be 100:1 to 100:100, or 100:10 to 100:100.

[0032] (Adhesive A2) The adhesive layer A is preferably composed of a cured product of an aqueous rubber adhesive (adhesive a2). The aqueous rubber adhesive is a one-component type, and after application, it is possible to buy time until the moisture contained in the adhesive penetrates the substrate and dries and hardens, and it is possible to reapply the adhesive until the hardening reaction of the precursor layer, which is the coating film of the aqueous rubber adhesive, is completed. In addition, the tackiness of the adhesive a2 and the adhesiveness exhibited by hardening can suppress the occurrence of peeling between the steel plate and the substrate when the steel plate panel is handled.

[0033] When the steel plate panel has a moisture-proof layer, in addition to preventing peeling during handling as described above, peeling between the steel plate and the substrate due to warping of the steel plate and the substrate can also be prevented. In particular, if the thickness of the steel plate is increased so that the decorative steel plate panel can exert a high adhesion and retention force on a magnet, the warping of the steel plate and the substrate becomes large, making peeling between the steel plate and the substrate more likely to occur, and therefore the effect of preventing peeling due to warping of the steel plate and the substrate is easily achieved. In particular, when the adhesive layer A is made of a cured product of the water-based rubber-type adhesive (adhesive a2) and has a moisture-proof layer on the side of the substrate opposite the steel plate, the above effect is more easily achieved.

[0034] Examples of the water-based rubber adhesive a2 include those using natural rubber, synthetic rubber, natural rubber latex, SBR latex, synthetic rubber latex such as chloroprene latex, nitrile rubber, etc. Specifically, a synthetic rubber latex type adhesive, etc. can be used.

[0035] The adhesive a may contain, as necessary, a water-soluble polymer, a plasticizer, a filler, a thickener, a wetting agent, a preservative, an anti-rust agent, an acid absorber, a flame retardant, an anti-aging agent, a colorant, a pH adjuster, an antifoaming agent, and a coupling agent.

[0036] When the adhesive a is a water-based adhesive, the solid content of the adhesive a is not particularly limited, but is usually 35% by mass to 60% by mass.

[0037] The pot life of adhesive a is preferably 5 minutes or more in an environment at a temperature of 20°C and a humidity of 50% RH, more preferably 10 minutes or more, and even more preferably 15 minutes or more. The pot life should not be too long, and under the same temperature and humidity environment, it is preferably, for example, 2 hours or less, and more preferably 1 hour or less. In this case, the pot life refers to the curing time of the adhesive, and means the time from when the substrate and the steel plate are bonded together via the adhesive until a level of adhesive strength that allows handling is developed.

[0038] The coating amount of adhesive layer A is 20 g / m2 in solid content. 2 ~200g / m 2 It is preferable that the thickness is 30 g / m 2 ~150g / m 2 More preferably, it is 40 g / m 2 ~100g / m 2 By setting the coating amount of the adhesive layer A within the above range, the steel sheet and the substrate can be firmly bonded, and the time required for the reaction (curing) of the adhesive layer A to be completed can be prevented from becoming too long.

[0039] 2. Steel plate The steel plate in the steel plate panel of the present disclosure is located on the opposite side of the substrate to the adhesive layer A. The above steel plate allows magnets to be strongly attracted and held on the surface of the steel plate panel of the present disclosure and the decorative plate (decorative steel plate panel) in which a decorative layer is provided on the steel plate of the steel plate panel.

[0040] The steel plate may be in direct contact with one surface of the adhesive layer A, or may be in contact with one surface of the adhesive layer A via another layer.

[0041] The steel plate is not particularly limited as long as it can attract a magnet. Examples of such steel plates include steel plates having a magnetic composition, such as stainless steel plates such as ferritic stainless steel and martensitic stainless steel, and carbon steel plates.

[0042] Furthermore, as the steel sheet capable of attracting a magnet, for example, a steel sheet (surface-treated steel sheet) plated with zinc, a zinc alloy, tin, chromium, copper, aluminum, an aluminum alloy, nickel, etc., can be used. As the plating method, an electric plating method, a hot-dip plating method, a vapor deposition plating method, etc. can be applied. After carrying out these platings, a known chemical conversion treatment such as a chromate treatment, a phosphate treatment, a silane coupling agent treatment, or a zirconium treatment may be carried out.

[0043] The thickness of the steel plate is preferably 0.2 mm to 1.0 mm, more preferably 0.2 mm to 0.4 mm, and even more preferably 0.25 mm to 0.35 mm, from the viewpoint of increasing the magnetic force (magnetic attraction) required for the surface of the steel plate panel of the present disclosure and the decorative plate (decorative steel plate panel) using the steel plate panel. The steel plate panel and the decorative steel plate panel using the steel plate panel need to increase the thickness of the steel plate to increase the surface attraction and retention force for the magnet, but on the other hand, the thicker the steel plate, the more likely burrs are to occur on the cut surface when cut, and the cutting workability is further reduced due to the increase in the frequency of blade replacement. In contrast, the steel plate panel of the present disclosure can be applied as a decorative steel plate panel without cutting. For this reason, the thickness of the steel plate can be increased to the above range, and the surface can have a high magnetic retention force.

[0044] 3. Substrate The substrate in the steel plate panel of the present disclosure is disposed on the opposite side of the adhesive layer A from the steel plate. The substrate is joined to the steel plate via the adhesive layer A. The substrate may be in direct contact with the other side of the adhesive layer A, or may be in contact with the other side of the adhesive layer A via another layer.

[0045] The substrate may be the same size as the steel plate in plan view, or may be larger than the steel plate. The substrate may be similar to the steel plate in plan view, or may be non-similar. For example, as shown in FIG. 3 described later, when the steel plate panel 10 of the present disclosure is provided so that the second region Q surrounds the entire outer edge of the first region P in plan view, the substrate may be similar to the steel plate in plan view and larger than the steel plate. Examples of substrates larger than the steel plate in plan view include, for example, a case where the steel plate is square and the substrate is rectangular and larger than the steel plate, a case where the short side length of the substrate is larger than the short side length of the steel plate and the long side length of the substrate is the same as the long side length of the steel plate, a case where the short side length of the substrate is the same as the short side length of the steel plate and the long side length of the substrate is larger than the long side length of the steel plate, and a case where the short side length and the long side length of the substrate are larger than the short side length and the long side length of the steel plate.

[0046] The thickness of the substrate is not particularly limited, but is preferably 2 mm to 30 mm from the viewpoint of the strength and thickness of the steel sheet panel of the present disclosure.

[0047] The substrate may be an inorganic or organic substrate used in a general-purpose decorative plate. The inorganic substrate may be one with a low resin content and a roughly plate-like shape. In addition to ceramic inorganic substrates, inorganic materials as aggregates or inorganic fibers bound with an organic binder may be used, but the total amount of inorganic materials is preferably 50% by mass or more of the inorganic substrate. The inorganic materials preferably have water of crystallization, such as aluminum hydroxide, magnesium hydroxide, and calcium silicate.

[0048] The substrate is preferably a non-combustible substrate in order to improve non-combustibility, and among them, a ceramic inorganic substrate is preferred from the viewpoints of heat resistance, non-combustibility, and easy availability. Examples of ceramic inorganic substrates include calcium silicate molded bodies, fiber-reinforced calcium silicate molded bodies, fiber-reinforced cement molded bodies, fiber-reinforced ceramic molded bodies, wood-based cement molded bodies, wood wool cement laminates, volcanic glass composite bodies, extrusion molded cement boards, slag gypsum boards, lightweight aerated concrete boards (ALC), glass boards, ceramics, tiles, stone materials, or composite boards thereof. Among them, calcium silicate molded bodies, fiber-reinforced calcium silicate molded bodies, fiber-reinforced cement molded bodies, or volcanic glass composite bodies are preferred.

[0049] The specific gravity of inorganic substrates is 0.7g / cm 3 It is preferable that the content is 0.8 g / cm or more. 3 More preferably, the specific gravity of the inorganic substrate is 2.3 g / cm or more. 3 It is preferable that the density is 2.0 g / cm or less. 3 By setting the specific gravity of the inorganic substrate within the above range, it is possible to ensure the mechanical strength of the surface and reduce the burden during construction due to the reduced weight, and it is also easy to obtain a decorative board with high surface hardness.

[0050] Examples of organic substrates include wood substrates and resin substrates. Of these, wood substrates are preferred from the viewpoint of improving economic efficiency and reducing environmental impact. Examples of the wood substrate include fiberboards such as medium density fiberboard (MDF) and hard fiberboard (hardboard), particle boards, and plywood. Of these, the wood substrate is preferably fiberboard or particle board, and more preferably medium density fiberboard (MDF).

[0051] The specific gravity of wood-based boards is 0.5 to 1 g / cm 3 The range is preferably 0.6 to 0.9 g / cm 3 It is more preferable that the thickness is in the range of 100 nm to 150 nm because the surface hardness can be increased.

[0052] 4. Moisture barrier The steel plate panel of the present disclosure may have at least a steel plate, an adhesive layer A, and a substrate in this order, but may further have a moisture-proof layer. If the thickness of the steel plate is increased to increase the adhesion force of the steel plate panel surface to a magnet, the difference between the warping of the steel plate and the warping of the substrate will become even greater, making the steel plate and the substrate more likely to peel off. In contrast, by having a moisture-proof layer at a desired position in the steel plate panel of the present disclosure, the moisture permeability can be kept low, and warping and peeling of the steel plate and the substrate can be prevented even if the thickness of the steel plate is increased.

[0053] Furthermore, when the adhesive layer A is composed of a cured product of an aqueous rubber type adhesive, it may or may not have a moisture-proof layer, but it is preferable to have a moisture-proof layer, as this can sufficiently suppress the occurrence of peeling between the steel plate and the substrate due to warping of the steel plate and the substrate as well as during handling.

[0054] The moisture-proof layer preferably has at least one selected from the group consisting of a moisture-proof resin layer, an inorganic vapor deposition layer, and a metal foil, and may have two or more.

[0055] An example of a moisture-proof layer having a moisture-proof resin layer is a laminate having a structure in which a paper layer, a moisture-proof resin layer, and a paper layer are laminated in this order. The resin constituting the moisture-proof resin layer is preferably a thermoplastic resin such as an olefin resin, more specifically, a polyethylene resin such as a high-density polyethylene resin (hereinafter referred to as HDPE), a polypropylene resin, etc. As the paper layer, for example, printing paper for building materials, pure white paper impregnated with latex or synthetic resin, thin paper with synthetic resin mixed therein to reinforce the interlayer strength (so-called interlayer reinforced paper), etc. are preferably used.

[0056] The moisture-proof layer having an inorganic vapor deposition layer may be a moisture-proof sheet having a resin substrate and a vapor deposition layer of a metal such as aluminum, or a vapor deposition layer of an inorganic compound such as silicon oxide or aluminum oxide. Examples of the inorganic compound constituting the inorganic vapor deposition layer include metals, metal oxides, metal nitrides, and metal carbides.

[0057] Examples of moisture-proof layers having a metal foil layer include laminates having a structure in which a metal foil such as aluminum and a paper layer are laminated, and laminates having a structure in which a resin film and a metal foil are laminated. The metal foil and the paper layer or the resin film layer may be bonded via an adhesive or polyethylene resin. The laminate may have a structure in which a paper layer or a resin film layer is laminated only on one side of the metal foil, or a structure in which a paper layer or a resin film layer is laminated on both sides of the metal foil. As the paper layer, for example, printing paper for building materials, pure white paper impregnated with latex or synthetic resin, thin paper in which synthetic resin is mixed to strengthen the interlayer strength (so-called interlayer reinforced paper), etc. are preferably used. As the resin film, for example, a general-purpose resin film such as a PET film can be used.

[0058] The moisture barrier has a water vapor permeability (moisture permeability) of 30g / m 2 - 24 hours or less is preferable, 15g / m 2 It is more preferable that the moisture vapor transmission rate is 24 hours or less. By having the moisture vapor transmission rate of the moisture barrier layer in the above range, the moisture vapor transmission rate is kept low, and warping or bending of the steel plate and the substrate, and peeling between the steel plate and the substrate can be suppressed. The moisture vapor transmission rate of the moisture barrier layer is measured in an environment of a temperature of 40°C and a humidity of 90% RH in accordance with JIS Z0208 (Moisture transmission test method (cup method)).

[0059] The moisture-proof layer may be disposed, for example, directly or via another layer on the surface of the substrate opposite to the adhesive layer A side, or may be provided between the steel plate and the substrate. Between the steel plate and the substrate may be between the steel plate and adhesive layer A, or between adhesive layer A and the substrate. Of these, it is preferable to provide a moisture-proof layer 4 on the surface of the substrate 3 opposite to the adhesive layer A side (reference numeral 2 in FIG. 2) as exemplified in FIG. 2, since this enhances the effect of suppressing warping of the steel plate and the substrate and peeling between the steel plate and the substrate.

[0060] When the adhesive layer A is formed of a water-based adhesive, the moisture-proof layer is preferably disposed directly or via another layer on the surface of the substrate opposite to the adhesive layer A. The moisture-proof layer does not inhibit dehydration from the coating film (precursor layer) of the water-based adhesive during the adhesive curing process, allowing the reaction of the water-based adhesive to proceed sufficiently, and peeling between the steel sheet and the substrate can be more effectively prevented.

[0061] When the moisture-proof layer is provided on the surface of the substrate opposite the adhesive layer A side, it is preferable that the moisture-proof layer covers the entire surface of the substrate opposite the adhesive layer A side, and the surface of the substrate opposite the adhesive layer A side and the side surface may also be covered.

[0062] 5.Adhesive layer B When the steel panel of the present disclosure has a moisture-proof layer, an adhesive layer B may be provided between the substrate and the moisture-proof layer. The adhesive layer B bonds the substrate and the moisture-proof layer. The adhesive b constituting the adhesive layer B is not particularly limited, and known adhesives such as urethane resin adhesives, silicone modified resin adhesives, urea resin adhesives, vinyl acetate emulsion adhesives, epoxy resin adhesives, melamine resin adhesives, phenolic resin adhesives, olefin resin adhesives, acrylic emulsion adhesives, chloroprene adhesives, nitrile rubber adhesives, and styrene-butadiene-rubber cyanoacrylate adhesives can be used. From the viewpoint of bonding the substrate and the moisture-proof layer in a short time, it is preferable that the adhesive b constituting the adhesive layer B is different from the adhesive a constituting the adhesive layer A.

[0063] The amount of the adhesive layer B applied is not particularly limited as long as it can firmly bond the substrate and the moisture-proof layer. For example, the amount of the adhesive layer B applied is 15 to 50 g / m2 in terms of solid content. 2 is preferable, and 20 to 40 g / m 2 is more preferred.

[0064] 6. Steel panels for decorative panels (steel panels) The steel plate panel of the present disclosure preferably has a number of sheets of paper that can be held when sandwiched between the steel plate side surface of the steel plate panel and a magnet, as measured by the following method, of 6 or more, more preferably 10 or more, even more preferably 12 or more, and even more preferably 13 or more. (Measurement method) Stand the steel panel vertically and place a circular neodymium magnet (Kokuyo super strong color magnet <Neomag> 1030NT) with a magnet diameter of 11 mm) between the steel panel and an A4 size copy paper (68 g / m 2 ) and measured how many sheets of copy paper it could hold.

[0065] 1(a)-(c), in a first embodiment of the steel sheet panel of the present disclosure, the entire periphery of the outer edge of the substrate 2 may coincide with the entire periphery of the steel sheet 1 in plan view from the steel sheet side. That is, the steel sheet panel of the first embodiment may have a first region P where the steel sheet and the substrate overlap.

[0066] In addition, the second embodiment of the steel sheet panel of the present disclosure (hereinafter, sometimes referred to as the steel sheet panel of the second embodiment) may have, as shown in Fig. 3(a)-(c), a first region P where the steel sheet 1 and the substrate 3 overlap in a plan view from the steel sheet 1 side, and a second region Q arranged outside the first region P along the outer edge of the first region P and not including the steel sheet 1. That is, the steel sheet panel of the second embodiment may have the first region P where the steel sheet and the substrate overlap, and the second region Q located outside the first region P, where the steel sheet and the substrate do not overlap and there is no steel sheet. Figs. 3(a)-(c) are schematic diagrams showing an example of the steel sheet panel of the second embodiment, Fig. 3(a) is a schematic top view, Fig. 3(b) is a cross-sectional view taken along the line XX in Fig. 3(a), and Fig. 3(c) is a cross-sectional view taken along the line YY in Fig. 3(a).

[0067] The steel plate panel of the second embodiment is characterized in that, instead of matching the sizes of the steel plate and the substrate, the steel plate is matched to the planar size of the desired decorative plate and the steel plate is provided at a predetermined position on the substrate which is larger than the steel plate, thereby improving the positional accuracy of the steel plate and the substrate. Furthermore, by having these two regions, the steel plate panel of the second embodiment can use the first region P, which is made of the composite material of the steel plate and the substrate, as the effective region of the decorative steel plate panel when a decorative layer is provided on the steel plate to form a decorative steel plate panel. The effective region of the decorative steel plate panel refers to the region on the surface of the decorative layer side of the decorative steel plate panel which is used as the usable surface.

[0068] When a decorative steel panel using the steel panel of the second embodiment is installed on a wall surface or the like, the second region Q of the steel panel of the second embodiment can be hidden by placing an installation member such as a joiner or a sealant on the second region Q, and the step between the first region P and the second region Q can be eliminated by the installation member. As a result, the decorative steel panel using the steel panel of the second embodiment does not need to be cut to a desired size. Furthermore, the steel panel of the second embodiment can be cut separately if the second region Q is not required, and since there is no steel plate in the second region Q, the second region is excellent in cutting workability and the cut second region Q can be easily disposed of as waste.

[0069] The steel sheet panel of the second embodiment may have a first region where the substrate and the steel sheet overlap in a plan view from the steel sheet side, and a second region outside the first region that does not include the steel sheet. The second region being arranged along the outer edge of the first region may mean that the second region Q is provided so as to surround the entire periphery of the outer edge of the first region P as shown in FIG. 3, or that the second region Q is arranged along a part of the outer edge of the first region P, for example, at least one side constituting the entire periphery of the outer edge, as shown in FIG. 4 and FIG. 5. More specifically, if the first region P is rectangular, it may be arranged along one side of the rectangle as shown in FIG. 4(a)-(c), or along two opposing sides of the rectangle as shown in FIG. 5(a)-(c), or along two intersecting sides of the rectangle (not shown), or along three sides of the rectangle.

[0070] In the steel plate panel of the second embodiment, the size of the first region P corresponds to the size of the steel plate in a plan view. The size of the first region P is preferably the same as the effective area (area of ​​the decorative layer) of a decorative steel plate panel using the steel plate panel of the present disclosure.

[0071] In the steel sheet panel of the second embodiment, the second region Q does not have to include a steel sheet, and may include only the substrate, or may include the substrate and one or more layers between the substrate and the steel sheet. In the case where the substrate has another layer, such as a moisture-proof layer, on the surface opposite to the steel sheet, the second region Q may include the substrate and the other layer.

[0072] In the steel panel of the present disclosure, the width of the second region Q may be 0 mm or more, and is preferably more than 0 mm. The width of the second region Q is preferably 3 mm or less, more preferably 2 mm or less, and even more preferably 1 mm or less. By setting the width of the second region Q in the above range, when a decorative steel panel using the steel panel of the second embodiment is installed on a wall surface, the second region Q can be hidden with installation members such as joiners and sealants, and the step between the first region P and the region Q can be eliminated by the installation members. Furthermore, by setting the width of the second region Q in the above range, commercially available joiners can be used, and the width of the installation members becomes narrower, making the installation members less noticeable, and a beautiful interior finish can be achieved. Furthermore, by setting the width of the second region Q in the above range, contamination by adhesive attached to the second region Q can be suppressed. The width of the second region Q refers to the shortest distance between the periphery of the steel plate and the periphery of the substrate, and refers to the length of the symbol w in the figure.

[0073] In addition, the steel plate panel of the present disclosure may have a third region R that includes a steel plate but does not include a substrate when viewed in a plan view. However, since there is a possibility of a cut injury occurring at the end of the steel plate in the third region R when a worker handles the panel, it is preferable not to have the third region R from a safety standpoint.

[0074] 7. Manufacturing method of steel panel The manufacturing method of the steel plate panel of the present disclosure has a bonding step of the following first or second aspect, in which the adhesive a is selected from the group consisting of an aqueous two-component curing adhesive, a solventless two-component curing adhesive, and an aqueous rubber adhesive. The first aspect of the bonding step is a step of applying adhesive a to one side of the steel plate to form a precursor layer of the adhesive layer A, and bonding the surface of the steel plate on the precursor layer side to the surface of the substrate directly or through another layer. The second aspect of the bonding step is a step of applying adhesive to one side of the substrate to form a precursor layer of the adhesive layer A, and bonding the steel plate to the precursor layer directly or through another layer.

[0075] According to the manufacturing method of the steel sheet panel of the present disclosure, by laminating the steel sheet and the substrate using a specific adhesive A in the lamination step, it is possible to adjust the lamination position of the steel sheet and the substrate, re-lamination, and temporary placement and temporary fixation until the reaction of the adhesive A is completed and a strong adhesive force is exhibited. This makes it possible to improve the positioning accuracy of the steel sheet and the substrate. In particular, when the substrate and the steel sheet are different in size, the substrate and the steel sheet can be laminated with high positioning accuracy.

[0076] (1) Lamination process The bonding step may be the first embodiment or the second embodiment described above. The bonding step of the second embodiment is preferable in that the substrate has the desired strength and thickness, and therefore the adhesive can be easily applied without being limited by the adhesive application method. The bonding step of the first embodiment is also preferable in that, when the steel plate panel has a second region Q, contamination by the adhesive attached to the second region Q can be suppressed. For example, when the substrate and the steel plate are pressed with a pressing roll as described later, the first embodiment can suppress contamination of the pressing roll by the adhesive attached to the second region Q. Among these, the bonding step of the second embodiment is preferable.

[0077] In each embodiment of the lamination process, adhesive a is applied to a steel plate or a substrate to form a precursor layer of the adhesive layer A. The precursor layer of the adhesive layer A is a layer before the components in the adhesive a react (before curing), in other words, a coating of the adhesive a. Furthermore, the precursor layer, which is a coating of the adhesive a, is cured to become the adhesive layer A composed of the cured product of the adhesive a.

[0078] The adhesive a used in each embodiment of the lamination step is selected from the group consisting of an aqueous two-component curing adhesive, a solventless two-component curing adhesive, and an aqueous rubber adhesive. The adhesive a for forming the precursor layer (adhesive layer A), the amount of adhesive a applied (solid content), and the like are the same as those described in the above section "1. Adhesive layer A".

[0079] The method of applying adhesive A is not particularly limited, and for example, roll coating, curtain flow coating, wire bar coating, reverse coating, gravure coating, gravure reverse coating, air knife coating, kiss coating, blade coating, smooth coating, comma coating, etc. can be used.

[0080] The lamination step is preferably performed in a room temperature environment. In addition, the lamination step is preferably performed by laminating the steel plate and the substrate via a precursor layer of the adhesive layer A, and then applying a load to the laminate including the steel plate, the precursor layer of the adhesive layer A, and the substrate in this order. By applying a load to the laminate after lamination and leaving it for a desired time, the reaction of the adhesive a progresses, the precursor layer hardens to become the adhesive layer A, and the adhesive layer A firmly bonds the steel plate and the substrate. The method of applying the load is not particularly limited, but a room temperature load method or a cold load method is preferable, and for example, a load method using a cold press, a load method using a room temperature pressing roll, etc. can be used. In addition, from the viewpoint of ensuring the curing time of the adhesive to enable positioning and alignment of the lamination position, the load is preferably not accompanied by heating.

[0081] In the lamination step, the environmental conditions from when the adhesive a is applied to form a precursor layer until the precursor layer becomes the adhesive layer A can be appropriately set according to the type of adhesive a. The environment from when the precursor layer is formed until the precursor layer becomes the adhesive layer A is preferably a room temperature environment without heating, and the specific environmental conditions are preferably a temperature within a range of 5°C to 40°C. Also, the humidity is preferably within a range of 20% RH to 100% RH. By setting the environmental conditions within the above range, it is possible to prevent the precursor layer from curing in a short time to become the adhesive layer A, which makes it impossible to align the lamination position of the steel plate and the substrate, temporarily place and fix it, re-attach it, and the like. Among them, an environment with a temperature of 20°C and a humidity of 50% RH is more preferable.

[0082] In the lamination step, the time until the bonding of the steel plate and the substrate is completed, that is, the time from when the adhesive a is applied to form a precursor layer to when the steel plate and the substrate are bonded via the precursor layer to when the precursor layer is cured to form the adhesive layer A (hereinafter, sometimes referred to as the bonding completion time), can be appropriately set according to the type and pot life of the adhesive a. The bonding completion time is preferably 5 minutes or more in an environment with a temperature of 5°C to 40°C and a humidity of 20% RH to 100% RH, more preferably 10 minutes or more, and even more preferably 15 minutes or more. In addition, the bonding completion time does not have to be too long, and is preferably, for example, 3 hours or less in the above environment, more preferably 2 hours or less, and even more preferably 1 hour or less. By laminating the steel plate and the substrate via the precursor layer in the lamination step and then leaving them to stand for the above environmental conditions and bonding completion time, the curing reaction of the precursor layer is prevented from being completed in a short time, and sufficient time can be secured for lamination position alignment, temporary fixing, re-bonding, etc. of the steel plate and the substrate, and bonding can be performed with high positional accuracy.

[0083] The method for aligning the lamination of the steel plate and the substrate in the lamination step is not particularly limited, and examples thereof include a method of sliding one of the steel plate or the substrate on the precursor layer, a method of peeling the steel plate or the substrate from the precursor layer once and placing it again at a desired position on the precursor layer and laminating them, etc. When aligning the lamination in the lamination step, the time from laminating the steel plate and the substrate to aligning them is not particularly limited, and can be set appropriately depending on the curing time of the adhesive.

[0084] (2) Preparation process The manufacturing method of the steel sheet panel of the present disclosure includes at least a bonding step, but may include a steel sheet and a preparation step of preparing the steel sheet prior to the bonding step.

[0085] In one embodiment of the preparation step, the steel plate and the substrate having the same dimensions and shape as the steel plate in a plan view may be prepared. By preparing a steel plate and a substrate having the same planar dimensions and shape in advance, it is possible to adjust the positions so that the edge of the steel plate and the edge of the substrate overlap with each other until the precursor layer hardens to become the adhesive layer A in the lamination step. This makes it possible to omit the step of cutting the composite material of the steel plate, the adhesive layer A, and the substrate to a desired dimension and shape after the lamination step.

[0086] In one embodiment of the preparation step, the steel plate and the substrate larger than the steel plate in plan view may be prepared. The substrate may be larger than the steel plate in plan view, and the planar shape of the substrate may be similar or non-similar to the planar shape of the steel plate. The substrate being larger than the steel plate means that the planar dimensions of the substrate are larger than the planar dimensions of the steel plate. Specifically, when one edge of the substrate and one edge of the steel plate are overlapped, it is preferable that at least one of the other edges of the substrate is located outside the edge of the opposing steel plate. If the substrate and the steel plate are each rectangular, it is preferable that at least one of the four sides of the planar shape of the substrate is longer than the side of the planar shape of the opposing steel plate. The difference between the longitudinal length of the substrate and the longitudinal length of the steel plate, and the difference between the lateral length of the substrate and the lateral length of the steel plate are not particularly limited, but each of these is preferably independently 10 mm or less, more preferably 6 mm or less, and even more preferably 5 mm or less, so that a second region of the desired width can be formed in the obtained steel plate panel without cutting.

[0087] In the preparation step, the steel plate is preferably cut to the size of the decorative plate (decorative steel plate panel) to which the steel plate panel of the present disclosure is applied, more specifically, to the same dimensions and shape as the effective area of ​​the decorative plate (decorative steel plate panel). The effective area of ​​the decorative plate (decorative steel plate panel) refers to the area on the surface of the decorative layer side of the decorative plate that is used as the usable surface.

[0088] (3) Moisture-proof layer formation process The manufacturing method of the steel sheet panel of the present disclosure may include a step of providing a moisture-proof layer (a moisture-proof layer forming step) in addition to the lamination step. In the moisture-proof layer forming step, the moisture-proof layer is preferably provided on one side of the substrate, and may be performed together with the preparation of the substrate in the preparation step, or may be performed after the lamination step.

[0089] A method for providing a moisture-proof layer on one side of a substrate can be, for example, a method in which an adhesive is applied to one side of the substrate or to the surface of the support layer side of the moisture-proof layer to form an adhesive layer B, and the substrate and the moisture-proof layer are laminated via the adhesive layer B. The moisture-proof layer and adhesive layer B were explained above in sections "4. Moisture-proof layer" and "5. Adhesive layer B", and therefore explanation thereof will be omitted here.

[0090] When a moisture-proof layer is provided on one side of the substrate in the lamination step, "one side of the substrate" in the lamination step and the substrate side to be laminated with the precursor layer may be the substrate side on which the moisture-proof layer is formed, or the substrate side opposite the substrate side from the moisture-proof layer side. Of these, the substrate side opposite the substrate side from the moisture-proof layer side is preferred because moisture generated during the process of converting the precursor layer into the adhesive layer A can be efficiently removed.

[0091] (4)Other The manufacturing method of the steel sheet panel of the present disclosure may include a decorative layer forming step of providing a decorative layer on one side of the steel sheet. The manufacturing of the steel sheet panel and the manufacturing of the decorative steel sheet panel can be carried out in one step. In the decorative layer forming step, the decorative layer is provided on the side of the steel sheet opposite to the side to be bonded to the substrate. The decorative layer forming step may be carried out together with the preparation of the steel sheet in the preparation step, or may be carried out after the bonding step. Details of the decorative layer and the decorative layer forming step will be explained in the section "II. Decorative steel sheet panel" below.

[0092] In the manufacturing method of the steel sheet panel of the present disclosure, after the lamination step, a cutting step may be performed, but is not necessary, to cut the composite material formed by bonding the steel sheet and the substrate via the adhesive layer A. By not performing the cutting step after the lamination step, the generation of burrs on the side surface of the steel sheet can be suppressed.

[0093] II. Decorative steel panels The decorative steel panel of the present disclosure has the steel panel described above in the section "I. Steel Panel for Decorative Plate" and a decorative layer provided on the steel plate of the steel panel. That is, the decorative steel panel of the present disclosure has a steel panel having at least a steel plate, an adhesive layer A, and a substrate in this order, and a decorative layer provided on the steel plate of the steel panel, and the adhesive layer A is composed of a cured product of adhesive a selected from the group consisting of an aqueous two-component curing adhesive, a solventless two-component curing adhesive, and an aqueous rubber adhesive.

[0094] 6(a)-(c) are schematic diagrams showing an example of a decorative steel panel of the present disclosure, where FIG. 6(a) is a schematic top view, FIG. 6(b) is a cross-sectional view taken along line XX in FIG. 6(a), and FIG. 6(c) is a cross-sectional view taken along line YY in FIG. 5(a). The decorative steel panel 20 has a steel panel 10 and a decorative layer 11 provided on a steel plate 1 of the steel panel 10. In FIG. 6, the decorative layer 11 is bonded to the steel panel 10 via an adhesive layer C (reference numeral 12 in FIG. 6). The steel panel 10 is the same as the steel panel 10 exemplified in FIG. 1.

[0095] 1. Steel panel The steel plate panel in the decorative steel plate panel of the present disclosure has at least a steel plate, an adhesive layer A, and a substrate, in this order. The steel plate panel in the decorative steel plate panel of the present disclosure is the same as that described in the above section "I. Steel Plate Panel," so a description thereof will be omitted here.

[0096] 2. Decorative layer The decorative layer in the decorative steel panel of the present disclosure is disposed on the steel plate of the steel plate panel (i.e., on the side opposite to the substrate side of the steel plate). The decorative layer is a layer that expresses the design of the surface of the decorative steel plate panel by color, pattern, etc. Examples of the decorative layer include a laminated structure having a support layer and a design layer disposed on one side of the support layer, and a laminated structure having a surface protection layer, an adhesive layer, a design layer (ink layer), and a support layer in this order, and the surface on the support layer side is the adhesive surface with the steel plate.

[0097] The decorative layer is preferably disposed over the entire surface (plate surface) of the steel plate. The decorative layer may cover at least the surface (plate surface) of the steel plate of the steel plate panel, but may also cover the side surface of the steel plate panel, and may also cover the back surface of the steel plate panel. When the steel plate panel has a first region P and a second region Q, the decorative layer covers at least the surface of the first region of the steel plate panel, but may also cover the surface and side surface of the first region, and may also cover the surface and side surface of the second region Q. The decorative layer may also be wrapped around the end of the substrate of the steel plate panel to the back surface (back surface of the steel plate panel) to cover the back surface of the steel plate panel (the surface opposite to the surface on the steel plate side).

[0098] The thickness of the decorative layer is not particularly limited, but is preferably 30 μm to 250 μm, more preferably 50 μm to 200 μm, and even more preferably 70 μm to 150 μm. By setting the thickness of the decorative layer within the above range, the desired design can be exhibited and the decrease in the magnetic retention force of the surface of the decorative steel sheet panel of the present disclosure can be suppressed.

[0099] <<Support layer>> The support layer constituting the decorative layer may be any layer capable of forming a design layer, such as paper, a resin sheet, a laminated sheet of paper and a resin sheet, etc. In particular, from the viewpoint of enabling the decorative steel panel of the present disclosure to exhibit high water resistance, it is preferable that the support layer includes a resin sheet.

[0100] Examples of the paper include plain paper, reinforced paper, impregnated paper, fine paper, linter paper, glassine paper, parchment paper, and kraft paper.

[0101] Examples of the resin sheet include thermoplastic resin sheets. Examples of the thermoplastic resin include polyester resins such as polyethylene terephthalate (PET), polyethylene naphthalate, and polybutylene terephthalate (PBT); polyolefin resins such as polypropylene, polyethylene, polymethylpentene, polybutene, ethylene-propylene copolymer resins, ethylene-propylene-butene copolymer resins, and olefin thermoplastic elastomers; polyurethane resins; polyamide resins; vinyl chloride resins; polycarbonate resins, polystyrene resins, vinyl acetate resins, and vinyl chloride-vinyl acetate copolymer resins. Among these, vinyl chloride resin sheets are the most excellent in terms of non-combustibility and can enhance the non-combustibility of the decorative steel panel of the present disclosure.

[0102] The surface of the support layer may be subjected to a surface treatment such as a corona treatment or a plasma treatment, because this can improve the adhesion between the support layer and the design layer.

[0103] The support layer may be a colored support layer containing a colorant, which exhibits a desired color by incorporating a known colorant such as a pigment or dye in the above-mentioned resin.

[0104] The thickness of the support layer is not particularly limited, but is preferably 30 μm to 250 μm, more preferably 50 μm to 200 μm, and even more preferably 70 μm to 150 μm, because by setting the thickness of the support layer within the above range, the decrease in the magnet holding force of the surface of the decorative steel sheet panel of the present disclosure can be suppressed.

[0105] <<Design Layer>> The design layer is a layer disposed on one side of the support layer (the side of the support layer opposite the steel sheet side). The design layer is formed on one side of the support layer by, for example, printing or the like.

[0106] The design layer may be a colored layer (solid colored layer) covering the entire surface of one side of the support layer, a patterned pattern, or a combination of a colored layer and a pattern layer, depending on the design required for the decorative steel panel. When the design layer is a pattern layer, the pattern of the pattern layer can be appropriately selected depending on the design required for the decorative steel panel, and examples of such patterns include wood grain patterns, stone grain patterns, cloth grain patterns, leather grain patterns, geometric patterns, letters, figures, and combinations of these patterns.

[0107] The ink forming the design layer contains at least a resin and a colorant. The resin is not particularly limited, and examples thereof include vinyl chloride acetate-vinyl copolymer resin, acrylic resin, urethane resin, acrylic urethane resin, nitrocellulose, polyvinyl alcohol, polyvinyl acetal, cellulose derivatives, polycarbonate resin, polyamide resin, polyester resin, butyral resin, etc., and one or a mixture of two or more of these resins can be used. These resins can also be made into a so-called two-liquid type by using a curing agent. Among them, two-liquid urethane resins are preferred. Examples of two-liquid curing urethane resins include two-liquid mixtures of polyols such as polyester, acrylic, and acrylic alkyd and isocyanate, and among them, acrylic urethane resins consisting of acrylic polyol and isocyanate compounds are more preferred.

[0108] Examples of the colorant include pigments and dyes selected from organic pigments and inorganic pigments. Examples of the inorganic pigment include titanium white, carbon black, yellow lead, cadmium yellow, cadmium red, red oxide, ultramarine, and aluminum white. Examples of the organic pigment include quinacridone, lake red, benzidine yellow, isoindolinone, phthalocyanine blue, and Sinclair red. As the colorant, any organic or inorganic pigment can be appropriately used in addition to the above examples depending on the desired color tone.

[0109] The content of colorant in the design layer is preferably 5 parts by mass or more and 90 parts by mass or less, more preferably 15 parts by mass or more and 80 parts by mass or less, and even more preferably 30 parts by mass or more and 70 parts by mass or less, per 100 parts by mass of the resin constituting the design layer.

[0110] The design layer may contain additives such as a matting agent, an ultraviolet absorber, a weathering agent such as a light stabilizer, a plasticizer, a catalyst, and an extender pigment, if necessary.

[0111] The coating amount of the design layer is not particularly limited as long as it can express the desired design, but is preferably 0.1 to 30 g / m in terms of solid content. 2 is preferred.

[0112] The design layer can be formed, for example, by printing on one side of the support layer using ink. The method for printing on the support layer can be, for example, a conventional printing method such as gravure printing, gravure offset printing, inkjet printing, screen printing, rotary screen printing, relief printing, or pad printing.

[0113] <<Surface protective layer>> The decorative layer may have a surface protective layer on the side opposite to the support layer of the decorative layer. By having a surface protective layer on the decorative layer, the surface hardness of the decorative steel panel of the present disclosure can be increased, the surface of the decorative layer can be protected, and the appearance of the decorative layer can be maintained. When the decorative layer has a surface protective layer, the surface protective layer can constitute one of the outermost layers of the decorative steel panel of the present disclosure.

[0114] The surface protective layer is basically transparent. The surface protective layer may be a single layer or may be formed of multiple layers. For example, the surface protective layer may have a multi-layer structure having a protective layer formed of a resin coating agent on a resin film, such as a PET film with a protective layer.

[0115] The surface protective layer can be formed using various commercially available resin coating agents. The surface protective layer is formed of a cured product obtained by curing a composition containing a curable resin such as a thermosetting resin or a radiation curable resin using heat or radiation. Examples of the thermosetting resin include epoxy resin, phenol resin, unsaturated polyester resin, urea resin, melamine resin, silicon resin, vinyl ester resin, polyimide resin, polyurethane resin, and two-liquid curable polyurethane resin. Examples of the radiation curable resin include a mixture of an oligomer component of urethane acrylate, epoxy acrylate, or polyester acrylate, or an acrylate monomer such as 2-hydroxyethyl acrylate, dipropylene glycol diacrylate, or trimethylolpropane triacrylate, and a radical polymerization photoinitiator (e.g., benzoin ethyl ether, benzyl dimethyl ketal, hydroxycyclohexyl phenyl ketone, or 2-hydroxy-2-methyl phenyl ketone).

[0116] If necessary, the surface protective layer may contain weathering agents, plasticizers, stabilizers, fillers, dispersants, colorants such as dyes and pigments, solvents, etc. Furthermore, the surface protective layer may be colored as long as the visibility of the design layer's pattern is ensured.

[0117] The surface protective layer may contain a matting agent. The surface protective layer may have a matte finish, and the gloss of the surface of the decorative steel panel of the present disclosure may be adjusted to a matte finish. The matting agent used in the surface protective layer is preferably of a size within a range that does not impair the magnetic attraction and design of the surface of the decorative steel panel of the present disclosure, and the transparency of the surface protective layer, and the average particle size of the matting agent is preferably 10 μm or less, for example.

[0118] As the matting agent, for example, materials known as matting agents such as silica, resin beads, matting wax, calcium carbonate, feldspar, etc. Among them, silica particles are preferably used.

[0119] The content of the matting agent in the surface protective layer is not particularly limited as long as it is within a range that does not impair the magnetic attraction and design properties of the decorative steel panel surface of the present disclosure, and the transparency of the surface protective layer, but is preferably 1 to 20 mass %, and more preferably 1 to 10 mass %, of the total amount of the composition that forms the surface protective layer.

[0120] The surface protective layer may contain an antibacterial agent and / or an antiviral agent, so that the surface of the decorative steel sheet panel of the present disclosure can have antibacterial and / or antiviral functions in addition to magnetic attraction and design properties.

[0121] The antibacterial and / or antiviral agent may be an inorganic antibacterial and / or antiviral agent, or an organic antibacterial and / or antiviral agent. As the inorganic antibacterial and / or antiviral agent, for example, a metal such as silver, copper, zinc, or a compound thereof, or a mixture thereof supported on an inorganic material is used. Examples of inorganic materials (supports) that support metal ions include ion exchangers such as zeolite, silica gel, clay minerals, zirconium phosphate, calcium phosphate, glass, and metals. Examples of metal oxides include titanium oxide, tin oxide, tungsten oxide, iron oxide, zinc oxide, chromium oxide, and zirconium oxide.

[0122] Examples of the organic antibacterial and / or antiviral agent include alcohols, phenols, aldehydes, carboxylic acids, esters, nitriles, peroxides, halogens such as iodines and chlorines, pyridine-quinolines, triazines, isothiazolones, imidazole-thiazoles, anilides, biguanides, disulfides, thiocarbamates, guanidines, organometallics, terpenes, carbohydrates, tropolones, etc. The antibacterial and / or antiviral agents may be used alone or in combination of two or more.

[0123] The content of the antibacterial and / or antiviral agent in the surface protective layer is not particularly limited as long as it is within a range that does not impair the magnet adsorptivity and designability of the decorative steel panel surface of the present disclosure and the transparency of the surface protective layer, but is preferably in the range of 0.1% by mass to 20% by mass, and more preferably in the range of 1% by mass to 10% by mass, based on the total amount of the composition forming the surface protective layer. By containing the antibacterial and / or antiviral agent in the above range, the surface protective layer can achieve both antibacterial and antiviral functions, abrasion resistance, and surface hardness, and the surface of the decorative steel panel of the present disclosure can exhibit these functions of the surface protective layer in addition to the magnet adsorptivity and designability.

[0124] The thickness (coating amount) of the above-mentioned surface protective layer is not particularly limited, but for example, it is 0.2 to 25 g / m 2 The thickness can be set to 0.5 to 20 g / m 2 is preferable, and 1 to 15 g / m 2 is more preferable. When the coating amount of the surface protective layer is within the above range, the design of the decorative layer can be visually recognized favorably, and the appearance can be maintained. When the surface protective layer has a multi-layer structure having a protective layer formed by a resin coating agent on a resin film, the thickness (coating amount) of the surface protective layer can be the thickness of the protective layer (coating amount of the resin coating agent).

[0125] The surface protective layer may be in direct contact with the surface of the design layer (ink layer), or may be provided on the design layer (ink layer) via an adhesive layer. The adhesive forming the adhesive layer between the surface protective layer and the design layer (ink layer) is not particularly limited, and any known adhesive (e.g., curing adhesive, hot melt adhesive, etc.) can be used.

[0126] 3.Adhesive layer C The decorative steel sheet panel of the present disclosure may have an adhesive layer C between the decorative layer and the steel sheet panel (steel sheet). The adhesive layer C bonds the decorative layer and the steel sheet panel (steel sheet).

[0127] The adhesive c of the adhesive layer C is not particularly limited as long as it can exhibit good adhesion to the steel plate and the decorative layer, and a general-purpose adhesive can be used. The adhesive c may be a curing adhesive or a hot melt adhesive. Examples of materials for the adhesive c include thermoplastic resins such as polyamide resins, acrylic resins, and vinyl acetate resins, curing resins such as thermosetting urethane resins, two-component curing polyurethane resins using isocyanate as a curing agent, polyester resins, reactive urethane hot melt adhesives, and ethylene vinyl acetate hot melt adhesives.

[0128] The amount of the adhesive layer C applied is not particularly limited as long as it can firmly bond the decorative layer and the steel plate of the steel plate panel. For example, the amount of the adhesive layer C applied is 10 to 70 g / m2 in terms of solid content. 2 is preferable, and 20 to 60 g / m 2 is more preferred.

[0129] 4.Other configurations The decorative steel plate panel of the present disclosure may comprise a steel plate panel having at least a steel plate, an adhesive layer A, and a substrate in that order, and a decorative layer provided on the steel plate of the steel plate panel, but may also comprise other components used in general decorative panels.

[0130] 5. Decorative steel panels 6(a) to 6(c), in a plan view from the decorative layer 11 side, the entire periphery of the outer periphery of the substrate 3 may coincide with the entire periphery of the steel plate 1. In addition, as shown in Figs. 7(a) to 7(c), in a plan view from the decorative layer 11 side, the decorative steel plate panel of the present disclosure may have a first region P where the decorative layer 11, the steel plate 1, and the substrate 3 overlap, and a second region Q that is disposed outside the first region P along the outer edge of the first region P and does not include the steel plate 1.

[0131] The first region P and the second region Q in the decorative steel panel of the present disclosure can be the same as the first region P and the second region Q described in the above section "I. Steel panel for decorative plate". The second region Q does not need to include at least a steel plate, and usually includes a substrate. The second region Q may not include a decorative layer, or may include a decorative layer.

[0132] 6. Manufacturing method of decorative steel panel The manufacturing method of the decorative steel plate panel disclosed herein includes a steel plate panel manufacturing process for manufacturing a steel plate panel using the manufacturing method described in the above section "I. Steel plate panel for decorative plate 7. Manufacturing method of steel plate panel," and a decorative layer forming process for providing a decorative layer on the surface of the above steel plate.

[0133] (1) Steel panel manufacturing process The steel panel manufacturing process in the manufacturing method of the decorative steel panel of the present disclosure is a process of manufacturing a steel panel using the manufacturing method described above in the section "I. Steel panel for decorative panel 7. Manufacturing method of steel panel." The details of the steel panel manufacturing process are the same as the details of the manufacturing method described above in the section "I. Steel panel for decorative panel 7. Manufacturing method of steel panel," so the description here is omitted.

[0134] (2) Decorative layer formation process In the manufacturing method of the decorative steel panel of the present disclosure, the decorative layer forming step is a step of providing a decorative layer on the surface of the steel plate. The decorative layer forming step may be performed together with the steel panel manufacturing step, or may be performed after the steel panel manufacturing step.

[0135] The decorative layer forming step may be performed together with the steel panel manufacturing step, for example, in a preparation step in the steel panel manufacturing step, where a decorative layer may be provided on one side of a steel plate cut to a desired shape or dimension, or where a decorative layer may be provided on one side of the steel plate and then the steel plate is cut to a desired shape or dimension. When a decorative layer is provided on one side of the steel plate in the lamination step in the steel panel manufacturing step, the "one side of the steel plate" in the lamination step and the surface of the steel plate to be laminated with the precursor layer refer to the surface of the steel plate opposite to the decorative layer side.

[0136] The decorative layer forming step may be performed after the steel panel manufacturing step, for example, by providing a decorative layer on the surface of the steel panel of the steel panel obtained after the lamination step. If the steel panel manufacturing step includes a moisture-proof layer forming step of providing a moisture-proof layer on the surface of the substrate after the lamination step, the decorative layer forming step may be performed after the moisture-proof layer forming step.

[0137] In the decorative layer forming step, the size (dimensions and shape) of the decorative layer is not particularly limited as long as it can cover at least the surface of the steel plate, and can be appropriately set according to the size (dimensions and shape) of the substrate or the steel plate panel. The decorative layer is provided so as to cover at least the sheet surface of the steel plate of the steel plate panel, but may be provided so as to cover the surface and side of the steel plate side of the steel plate panel, and may further be provided so as to cover the back surface of the steel plate panel. When the steel plate panel has a first region P and a second region Q, the decorative layer is provided so as to cover at least the surface of the first region P of the steel plate panel, but may be provided so as to cover the surface and side of the first region P, and may further be provided so as to cover the surface and side of the second region Q. The decorative layer may also be provided in a form that wraps around the end of the substrate of the steel plate panel to the back surface (back surface of the steel plate panel).

[0138] A method for providing a decorative layer on the surface of a steel sheet can be, for example, to prepare a decorative layer having a design layer formed on a support layer, apply an adhesive to one side of the steel sheet or to the support layer side surface of the decorative layer to form an adhesive layer C, and then bond the steel sheet and the decorative layer via the adhesive layer C. The decorative layer and adhesive layer C are the same as those explained above in sections "2. Decorative layer" and "3. Adhesive layer C".

[0139] The manufacturing method of the decorative steel panel of the present disclosure only needs to have a steel panel manufacturing process and a decorative layer forming process, and may have other optional processes. The moisture-proof layer forming process, which is an optional process in the steel panel manufacturing process, may be performed separately and independently from the steel panel manufacturing process. The method of providing a moisture-proof layer on one side of the substrate is the same as the details explained in the above section "I. Steel panel for decorative panel 7. Manufacturing method of steel panel".

[0140] The manufacturing method of the decorative steel sheet panel of the present disclosure does not need to include a cutting step of cutting a composite material having a decorative layer provided on the surface of the steel sheet of the above-mentioned decorative steel sheet panel.

[0141] The present disclosure is not limited to the above-described embodiments. The above-described embodiments are merely examples, and anything that has substantially the same configuration as the technical idea described in the claims of the present disclosure and exhibits similar effects is included in the technical scope of the present disclosure. EXAMPLES

[0142] The present disclosure will be further described below with reference to examples and comparative examples.

[0143] [Example 1] (Preparation of decorative sheet (decorative layer)) A polybutylene terephthalate (PBT) substrate sheet with a thickness of 80 μm was used, and a colored pattern layer and a protective layer were formed on one side of the substrate sheet by gravure printing to produce a decorative sheet.

[0144] (Preparation of decorative steel sheet) The decorative sheet was laminated with a urethane adhesive onto one side of a hot-dip galvanized steel sheet having a thickness of 0.32 mm to obtain a steel sheet with a decorative layer. The steel sheet with a decorative layer was cut into a size of 910 mm x 2420 mm using a shearing machine.

[0145] (Preparation of substrate with moisture-proof layer) A 3 mm thick volcanic glass laminate (product name: Dailite FTL, manufactured by Daiken Kogyo Co., Ltd., with special sheet) was prepared. The volcanic glass laminate had a special sheet laminated on one side as a moisture-proof layer, in which paper, aluminum foil, and paper were laminated in this order, and the other side was a substrate with a moisture-proof layer, which was the base surface of the volcanic glass laminate. The substrate with the moisture-proof layer was cut to 912 mm x 2422 mm using a running saw with a wood chip saw attached.

[0146] (Creating decorative steel panels) A water-based two-component curing vinyl copolymer emulsion adhesive was applied with a roll coater to the side of the substrate opposite to the side on which the moisture-proof layer (special sheet) was attached (the bare surface of the substrate). The amount of water-based two-component curing vinyl copolymer emulsion adhesive applied was 150 g / m2 (wet). 2 (Solid content 75g / m 2 The aqueous two-component curing vinyl copolymer emulsion adhesive used was an isocyanate-curing aqueous two-component adhesive, which was made by mixing a vinyl copolymer emulsion resin adhesive (product name: Bond CVC300M, Konishi Corporation) as the base agent and an isocyanate curing agent (product name: Curing Agent NV, Konishi Corporation) as the curing agent in a mass ratio of base agent:curing agent = 100:2.5.

[0147] The steel plate with a decorative layer was placed on the surface of the substrate with a moisture-proof layer coated with an aqueous two-component curing vinyl copolymer emulsion adhesive, with the steel plate side of the steel plate with a decorative layer facing the substrate with a moisture-proof layer, and laminated together. Two minutes after lamination, the steel plate with a decorative layer was slid over the coating film (precursor layer) of the adhesive so that each of the four sides of the substrate (substrate with a moisture-proof layer) protruded 1 mm from the steel plate (steel plate with a decorative layer), and the lamination position of the steel plate with a decorative layer was fine-tuned. In this state, the composite material consisting of the steel plate with a decorative layer and the substrate with a moisture-proof layer was passed together through a pressure roller to temporarily fix them, and then cold pressed for 30 minutes at 2000 N / m 2 (0.02kgf / cm 2 ) load was applied to obtain a decorative steel panel.

[0148] [Example 2] A decorative steel sheet panel was obtained in the same manner as in Example 1, except that the thickness of the hot-dip galvanized steel sheet was changed to 0.2 mm.

[0149] [Example 3] When bonding a substrate with a moisture-proof layer to a steel sheet with a decorative layer, the adhesive applied to the substrate with the moisture-proof layer was changed to a solvent-free two-liquid curing urethane adhesive, and the amount applied was increased to 200 g / m. 2Except for the above, a decorative steel panel was obtained in the same manner as in Example 1. The solvent-free two-component curing urethane adhesive used was an isocyanate-curing solvent-free two-component adhesive in which an adhesive containing polyol resin as the main component as the main agent (product name: Bond KU570, Konishi Co., Ltd.) and a curing agent containing polyisocyanate as the main component as the curing agent (product name: KU Curing Agent NO10, Konishi Co., Ltd.) were mixed in a mass ratio of main agent:curing agent = 50:50.

[0150] [Example 4] When bonding the substrate with a moisture-proof layer and the steel plate with a decorative layer, a solvent-free two-component curing urethane adhesive (the same as that used in Example 3) was applied to the surface of the substrate with a moisture-proof layer on the moisture-proof layer side (the surface on which the special sheet was attached), and the steel plate with a decorative layer was placed on the surface coated with the adhesive and bonded together. Except for this, a decorative steel plate panel was obtained in the same manner as in Example 3.

[0151] [Example 5] When bonding a substrate with a moisture-proof layer and a steel plate with a decorative layer, the adhesive applied to the substrate with the moisture-proof layer was changed to a water-based rubber adhesive (one-liquid synthetic rubber latex adhesive, product name: Bond WG22, Konishi Co., Ltd.), and the amount applied was changed to 150 g / m. 2 (Solid content 75g / m 2 ) A decorative steel sheet panel was obtained in the same manner as in Example 1.

[0152] [Example 6] A 6 mm-thick calcium silicate board (specific gravity 0.8) was used as the substrate, and a decorative steel panel was obtained in the same manner as in Example 1, except that no moisture-proof layer was provided. The substrate was a bare board with a polished finish of 100 grit on the front side and an unpolished back side, with no sheets attached to either side, and a steel plate with a decorative layer was attached to the front side of the substrate to produce the decorative steel panel.

[0153] [Example 7] The substrate was made of 2.5 mm thick MDF (product name: Techwood, Daiken Corporation) and no moisture-proof layer was provided. The amount of adhesive applied to the substrate when bonding the substrate and the steel plate with the decorative layer was 100 g / m2. 2 (Solid content 50g / m 2 A decorative steel panel was obtained in the same manner as in Example 1, except that the MDF used was a bare board with no sheets attached to either side, and a steel plate with a decorative layer was attached to one side of the MDF to produce the decorative steel panel.

[0154] [Example 8] (Preparation of substrate with moisture-proof layer) Moisture-proof paper (a sheet of paper, polyethylene and paper laminated in order) used as a moisture-proof layer. Moisture permeability at a temperature of 40°C and humidity of 90% using the cup method (JIS Z0208): 8 g / m 2 A 2.5 mm thick MDF (product name: Techwood, Daiken Corporation) was prepared as a substrate. A water-based EVA emulsion adhesive (ethylene-vinyl acetate emulsion adhesive, one-part type, product name: Bond CV6400, Konishi Corporation) was applied to one side of the substrate at a wet rate of 60 g / m. 2 (Solid content 30g / m 2 ) and the moisture-proof paper (moisture-proof layer) was attached to obtain a substrate with a moisture-proof layer. The substrate with the moisture-proof layer was cut to 912 mm x 2422 mm using a running saw with a wood chip saw attached.

[0155] (Creating decorative steel panels) A decorative steel plate panel was obtained in the same manner as in Example 7, except that when bonding the substrate with a moisture-proof layer and the steel plate with a decorative layer, adhesive was applied to the side of the substrate with a moisture-proof layer opposite to the side on which the moisture-proof layer (moisture-proof paper) was attached (the bare surface of the substrate).

[0156] [Example 9] When bonding a substrate with a moisture-proof layer and a steel plate with a decorative layer, the adhesive applied to the substrate with the moisture-proof layer was changed to a water-based rubber adhesive (one-liquid synthetic rubber latex adhesive, product name: Bond WG22, Konishi Co., Ltd.), and the application amount was changed to 120 g / m. 2(Solid content 60g / m 2 ) A decorative steel sheet panel was obtained in the same manner as in Example 8.

[0157] [Example 10] A decorative steel panel was obtained in the same manner as in Example 9, except that the substrate (MDF) without a moisture-proof layer used in Example 7 was used instead of the substrate with a moisture-proof layer.

[0158] [Comparative Example 1] When bonding a substrate with a moisture-proof layer and a steel sheet with a decorative layer, the adhesive applied to the substrate with the moisture-proof layer was changed to a reactive urethane hot melt adhesive (product name: Tyforce HH-900, DIC Corporation), and the amount applied was increased to 150 g / m. 2 A decorative steel plate panel was obtained in the same manner as in Example 1, except that no load was applied by the cold press. When preparing the decorative steel plate panel, a steel plate with a decorative layer was placed on a coating film (precursor layer) of the adhesive formed by applying an adhesive to a substrate with a moisture-proof layer, and the two panels were laminated together. Two minutes after lamination, an attempt was made to fine-tune the position of the steel plate with a decorative layer by sliding the steel plate with a decorative layer over the precursor layer so that the four sides of the substrate (substrate with a moisture-proof layer) protruded 1 mm each from the steel plate (steel plate with a decorative layer). However, the adhesive had cooled down and its viscosity had increased, making it impossible to adjust the position, and a decorative steel plate panel was obtained in which the steel plate with a decorative layer protruded from the substrate with a moisture-proof layer and was out of alignment with the laminate.

[0159] [Comparative Example 2] A decorative steel plate panel was produced in the same manner as in Comparative Example 1, except that when bonding the substrate with a moisture-proof layer and the steel plate with a decorative layer, an adhesive was applied to the surface of the substrate with a moisture-proof layer (the surface to which the special sheet was attached) on the moisture-proof layer side, and then the surface was bonded to the steel plate side of the steel plate with a decorative layer. At this time, when producing the decorative steel plate panel, the steel plate with a decorative layer was placed on a coating film (precursor layer) of pressure-sensitive adhesive formed by applying an adhesive to the substrate with a moisture-proof layer, and two minutes after bonding, an attempt was made to fine-tune the position of the steel plate with a decorative layer by sliding the steel plate with a decorative layer on the precursor layer so that each of the four sides of the substrate (substrate with a moisture-proof layer) protruded 1 mm from the steel plate (steel plate with a decorative layer); however, the adhesive had cooled and become more viscous, making it impossible to adjust the position, and a decorative steel plate panel was obtained in which the steel plate with a decorative layer protruded from the substrate with a moisture-proof layer and was out of position.

[0160] [Comparative Example 3] A decorative steel panel was obtained in the same manner as in Comparative Example 2, except that the decorative steel panel was cut to 920 mm x 2430 mm, the substrate with the moisture-proof layer was cut to 930 x 2440 mm, and the substrate side surface of the substrate with the moisture-proof layer and the steel plate side surface of the steel plate with the decorative layer were bonded together with a reactive urethane hot melt adhesive. When the decorative steel panel was produced, the decorative steel panel was placed on a coating film (precursor layer) of pressure-sensitive adhesive formed by applying an adhesive to the substrate with the moisture-proof layer, and the steel plate was bonded together. When the decorative steel panel was attempted to slide the decorative steel panel on the precursor layer 2 minutes after bonding, the adhesive had cooled down and the viscosity had increased, so the slide movement was not possible. In addition, during the production of the decorative steel panel, the adhesive was transferred from the edge of the substrate to the pressure roller, causing contamination. Furthermore, after bonding the substrate with the moisture-proof layer and the decorative steel panel, the four peripheral edges were cut to a size of 910 mm x 2420 mm with a panel saw equipped with a steel plate chip saw, and burrs were generated on the cut surface by the chip saw.

[0161] [Comparative Example 4] (Iron foil with decorative layer) In preparing the steel sheet with a decorative layer in Example 1, instead of using a hot-dip galvanized steel sheet, a decorative sheet was dry laminated to one side of a 100 μm thick iron foil sheet using a urethane adhesive to obtain an iron foil with a decorative layer having an effective width of 940 mm.

[0162] (Creating decorative iron leaf panels) The substrate with moisture-proof layer used in Example 1 was cut to 930mm x 2440mm using a running saw equipped with a woodworking tipped saw, and a hot melt adhesive was applied to the moisture-proof layer side surface of the substrate with moisture-proof layer (the surface with the special sheet attached) in the same manner as in Comparative Example 1.Then the iron foil with decorative layer was placed on top of that and bonded by passing it through a pressure roller, and the four peripheral edges of the panel were cut using a running saw equipped with a woodworking tipped saw to obtain a decorative iron foil panel measuring 910mm x 2420mm.

[0163] [Comparative Example 5] A decorative steel panel was obtained in the same manner as in Comparative Example 1, except that a 3 mm thick fiber-reinforced cement board (specific gravity 1.6) was used as the substrate, and no moisture-proof layer was provided on the substrate. The substrate was a bare board with a polished finish of 100 grit on both sides, with no sheets attached. When preparing the decorative steel panel, the steel plate with the decorative layer was placed on a coating film (precursor layer) of pressure-sensitive adhesive formed by applying an adhesive to the substrate, and laminated. Two minutes after lamination, an attempt was made to fine-tune the position of the steel plate with the decorative layer by sliding the steel plate with the decorative layer on the precursor layer so that each of the four sides of the substrate protruded 1 mm from the steel plate with the decorative layer. However, the adhesive had cooled and become more viscous, making it impossible to adjust the position, and a decorative steel panel was obtained in which the steel plate with the decorative layer protruded from the substrate with the moisture-proof layer and was out of alignment with the laminate.

[0164] [Comparative Example 6] When bonding a substrate with a moisture-proof layer and a steel sheet with a decorative layer, the adhesive applied to the substrate was changed to a hot melt adhesive, and the amount of adhesive applied was increased to 150 g / m. 2A decorative steel plate panel was obtained in the same manner as in Example 9, except that no load was applied by cold pressing. When preparing the decorative steel plate panel, a steel plate with a decorative layer was placed on a coating film (precursor layer) of pressure-sensitive adhesive formed by applying an adhesive to a substrate and laminated, and an attempt was made to fine-tune the position of the steel plate with a decorative layer by sliding the steel plate with a decorative layer on the precursor layer so that the four sides of the substrate (substrate with moisture-proof layer) protruded 1 mm each from the steel plate (steel plate with decorative layer) 2 minutes after lamination, but position adjustment was not possible because the adhesive had cooled and become more viscous, and a decorative steel plate panel was obtained in which the steel plate with a decorative layer protruded from the substrate with moisture-proof layer and was out of alignment with the laminate.

[0165] [Comparative Example 7] A decorative steel plate panel was obtained in the same manner as in Example 7, except that when bonding the substrate with a moisture-proof layer and the steel plate with a decorative layer, the adhesive applied to the substrate was the main adhesive agent containing a vinyl copolymer emulsion (product name: Bond CVC300M, Konishi Co., Ltd.) and no isocyanate curing agent was added (i.e., a one-component water-based adhesive was used).

[0166] [evaluation] The ease of manufacturing the decorative steel sheet panels (Comparative Example 4 is a decorative iron foil panel) and the performance of the prepared decorative steel sheet panels were evaluated by the following methods, and the results are shown in the table.

[0167] 1) Whether the position of the substrate and the steel sheet can be adjusted when laminating them (precision of the position of the substrate and the steel sheet) The ease of position adjustment (possibility of position adjustment) when the steel plate (iron foil in Comparative Example 4) was slid on the precursor layer 2 minutes after bonding the steel plate to the substrate via a coating film (precursor layer) was evaluated based on the distance over which the position could be adjusted (the distance over which the plate could be slid) according to the following criteria. In cases where the position adjustment when bonding the steel plate to the substrate was "◎ easy" or "○ possible", it was determined that the positional accuracy of the steel plate and substrate in the resulting decorative steel plate panel was high. On the other hand, in cases where the position adjustment when bonding the steel plate to the substrate was "× difficult", the steel plate and substrate were bonded while misaligned during bonding in the resulting decorative steel plate panel, and the steel plate and substrate could not be bonded in the intended positions, so it was determined that the positional accuracy of the steel plate and substrate was low. ◎Easy: Position adjustment of 5mm or more possible Possible: Position adjustment of 1 to 4 mm possible × Difficult: position adjustment of even 1mm is not possible

[0168] 2) The necessity of cutting all around after lamination The necessity of cutting all four sides after laminating the steel plate and the substrate was judged as "necessary" or "not necessary." In cases where the position could not be adjusted during lamination and the steel plate was joined in a state where it protruded from the substrate, it was judged that the edge of the steel plate needed to be cut off due to safety issues during handling. In addition, in cases where the substrate protruded more than 3 mm beyond the steel plate, it was judged that the edge needed to be cut off.

[0169] 3) Adhesion condition of the adhesive surface between the steel sheet and the substrate The prepared decorative steel panel was cured for one day under normal conditions, and then a chisel was struck from the end cross section against the adhesive layer between the steel plate and the substrate (if the substrate has a moisture-proof layer on the surface facing the steel plate, the adhesive layer between the steel plate and the moisture-proof layer) to forcibly peel the steel plate and the substrate apart. The adhesive condition between the steel plate and the substrate was judged according to the following criteria. In Comparative Example 4, the iron foil was forcibly peeled away from the substrate in the same manner, and the adhesive condition was judged according to the following criteria. ○Good: The substrate is attached to the steel plate. × Defective: The substrate is not attached to the steel plate or the adhesive is not hardened.

[0170] 4) Magnetic attraction and retention force Stand the decorative steel panel vertically, and place a circular neodymium magnet (Kokuyo super strong color magnet <Neomag> 1030NT, magnet diameter 11 mm) between the decorative steel panel and an A4 size copy paper (68 g / m 2 ) and measure how many sheets of copy paper it could hold, and judge based on the following criteria: 12 or more sheets: High adhesion to magnets 6 to 11 sheets: Medium magnetic adhesion 5 or less: Low magnetic attraction and retention

[0171] 5) Environmental testing The decorative steel panel was cut into 300 mm squares and placed flat in an environmental tester. The environmental tester was cycled three times, for three days at 40°C, 90% RH, and four days at 40°C, 30% RH, and the peeling between the steel plate and the substrate and the warping of the panel were observed and judged according to the following criteria. ○: No warping or peeling △: Warping is observed but no peeling ×: Warping is observed, and peeling occurs between the steel plate and the substrate due to warping.

[0172] 6) Handling test After the decorative steel panel was cured for one day in its normal state, two people lifted both short sides of the decorative steel panel and held it in the air with the front side of the panel facing up. At this time, the center of the decorative steel panel deformed and drooped downward under its own weight. Next, while holding the short sides, the two people flipped the panel over and held it so that the back side of the panel was facing up. At this time, the center of the decorative steel panel deformed and drooped downward under its own weight. The same operation was repeated a total of 20 times, applying a deformation load to the decorative steel panel. At this time, peeling between the steel plate and the substrate was observed and judged according to the following criteria. ○: No peeling ×: Peeling

[0173] [Table 1]

[0174] [Table 2]

[0175] The steel sheet panels and decorative steel sheet panels of the examples had high accuracy of lamination position between the steel sheet and the substrate, and no cutting process was required after lamination of the steel sheet and the substrate. In addition, no peeling occurred between the steel sheet and the substrate during handling, and they had high adhesion and retention to magnets. Furthermore, no burrs were observed on the side surfaces of the steel sheet panels and decorative steel sheet panels. Among them, in Examples 1 to 4, 6 to 8 using adhesive a1, and Examples 5 and 9 using adhesive a2 and including a moisture-proof layer, peeling due to warping of the steel sheet and the substrate was suppressed not only during handling but also.

[0176] On the other hand, the steel sheet panels and decorative steel sheet panels of Comparative Examples 1 to 6 could not achieve positional precision because fine adjustment of the position was not possible after the steel sheet and the substrate were brought into contact with each other via the adhesive. In Comparative Example 3, when the steel sheet and the substrate were joined via the adhesive and then cut to the desired size, burrs occurred on the cut surface. In Comparative Example 7, peeling occurred between the substrate and the steel sheet during handling, and peeling occurred between the substrate and the steel sheet due to warping of the substrate and the steel sheet. [Industrial Applicability]

[0177] The steel sheet panels and decorative steel sheet panels of the present disclosure can be used for surface decoration purposes such as interior decoration of floors, walls, ceilings, etc. of buildings, surface decoration materials for furniture, various cabinets, etc., surface decoration of building fixtures, and surface decoration for vehicle interiors, etc. [Explanation of symbols]

[0178] 1...steel plate, 2...adhesive layer A, 3...substrate, 4...moisture-proof layer, 10...steel plate panel for decorative plate, 11...decorative layer, 20...decorative steel plate panel

Claims

1. The adhesive sheet has at least a steel plate, an adhesive layer A, and a substrate in this order, The adhesive layer A is composed of a cured product of adhesive a selected from the group consisting of an aqueous two-component curing adhesive, a solventless two-component curing adhesive, and an aqueous rubber adhesive.

2. 2. The steel sheet panel for decorative board according to claim 1, wherein the adhesive a is an isocyanate-curing two-component adhesive.

3. The coating amount of the adhesive layer A was 20 g / m in solid content. ２ Up to 200 g / m ２ The decorative steel sheet panel according to claim 1,

4. The decorative steel sheet panel according to claim 1, wherein the thickness of the steel sheet is 0.2 mm to 1.0 mm.

5. The steel sheet panel for decorative board according to claim 1 , further comprising a moisture-proof layer.

6. A decorative steel panel comprising the steel sheet panel for decorative board according to claim 1 and a decorative layer provided on the steel sheet of the steel sheet panel for decorative board.

7. A method for producing a steel sheet panel for decorative board, comprising at least a steel sheet, an adhesive layer A, and a substrate in this order, a bonding step of applying an adhesive a to one surface of the steel plate to form a precursor layer of the adhesive layer A, and bonding the substrate to the precursor layer directly or via another layer; Or a bonding step of applying an adhesive a to one surface of the substrate to form a precursor layer of the adhesive layer A, and bonding the steel plate to the precursor layer directly or via another layer; and A method for producing a steel sheet panel for decorative board, wherein the adhesive a is selected from the group consisting of an aqueous two-component curing adhesive, a solventless two-component curing adhesive, and an aqueous rubber adhesive.

8. The steel plate and the substrate are bonded via the precursor layer, and the time until the precursor layer is cured to form the adhesive layer A is 5 minutes or more under an environment of a temperature of 5° C. to 40° C. and a humidity of 20% RH to 100% RH. The manufacturing method of a steel plate panel for decorative plates according to claim 7.

9. The method for producing a steel sheet panel for decorative board according to claim 7 , further comprising a preparation step of preparing the steel sheet and the substrate having the same dimensions and shape as the steel sheet in a plan view, prior to the laminating step.

10. The method for manufacturing a steel sheet panel for decorative board according to claim 7 , further comprising a preparation step of preparing the steel sheet and the substrate larger than the steel sheet in a plan view before the bonding step.

11. The method for producing a steel sheet panel for decorative board according to claim 7, which does not include a cutting step of cutting a composite material formed by bonding the steel sheet and the substrate via the adhesive layer A after the lamination step.

12. A steel sheet panel manufacturing process for manufacturing a steel sheet panel using the method for manufacturing a steel sheet panel for decorative board according to claim 7; a decorative layer forming step of providing a decorative layer on a surface of the steel sheet; A method for manufacturing a decorative steel panel comprising the steps of:

13. The method for producing a decorative steel panel according to claim 12, which does not include a cutting step of cutting a composite material having a decorative layer provided on the steel plate side surface of the decorative steel panel.

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