JP2020157683A - Decorative steel sheet - Google Patents

Abstract

To provide a decorative steel sheet that has a novel function.SOLUTION: A decorative steel sheet 1 has a metal steel sheet 11, and on the metal steel sheet 11, a base coat layer 12, a pattern layer 13 and a top coat layer 14 are laminated in this order in their thickness direction. The top coat layer 14 contains microcapsules.SELECTED DRAWING: Figure 1

Description

The present invention relates to a decorative steel plate.

As the decorative steel plate used as an interior material of a building, for example, a metal steel plate is provided, and a base coat layer, a pattern layer, and a top coat layer are placed on the metal steel plate in this order in the thickness direction. Examples thereof include those constructed by being laminated. The top coat layer is sometimes called a clear coat layer.

In such a decorative steel plate, the pattern layer has a desired pattern such as a wood grain pattern or an abstract pattern, and the top coat layer is transparent. Therefore, in the decorative steel plate, when this is observed from the outside on the top coat layer side, the pattern layer can be visually recognized through the top coat layer, and the decorative steel plate has a design property due to the presence of this pattern layer. Has.

Various decorative steel sheets have been proposed according to the purpose. For example, by providing a matte printing layer having a specific range of height between the pattern layer and the top coat layer. , A decorative steel plate with improved design is disclosed (see Patent Document 1).

JP-A-2017-164942

Furthermore, with the diversification of building specifications, decorative steel plates are required to have unprecedented functions.

An object of the present invention is to provide a decorative steel plate having a novel function.

In order to solve the above problems, the present invention comprises a metal steel plate, and a base coat layer, a pattern layer, and a top coat layer are laminated on the metal steel plate in this order in the thickness direction. Provided is a decorative steel plate in which the top coat layer contains microcapsules.
In the decorative steel plate of the present invention, it is preferable that the constituent component of the wall material of the microcapsules is a melamine resin.

According to the present invention, a decorative steel plate having a novel function is provided.

It is sectional drawing which shows typically an example of the decorative steel plate of this embodiment. It is sectional drawing which shows the other example of the decorative steel plate of this embodiment schematically. It is sectional drawing which shows still another example schematically of the decorative steel plate of this embodiment. It is sectional drawing which shows still another example schematically of the decorative steel plate of this embodiment.

<< Cosmetic steel plate >>
The decorative steel plate according to the embodiment of the present invention includes a metal steel plate, and the base coat layer, the pattern layer, and the top coat layer are laminated on the metal steel plate in this order in the thickness direction. The topcoat layer contains microcapsules.
The decorative steel plate of the present embodiment has a novel function according to the type of the microcapsules because the top coat layer contains the microcapsules.

In the decorative steel plate in which the top coat layer, which is the microcapsule-containing layer, is the outermost layer, the effect of using the microcapsules is higher than in the case of the decorative steel plate in which the microcapsule-containing layer is not the outermost layer.

Hereinafter, the decorative steel plate of the present embodiment will be described in detail with reference to the drawings.
In addition, in the figure used in the following description, in order to make it easy to understand the features of the present invention, the main part may be enlarged for convenience, and the dimensional ratio and the like of each component are the same as the actual ones. Is not always the case.

FIG. 1 is a cross-sectional view schematically showing an example of a decorative steel plate of the present embodiment.
The decorative steel plate 1 shown here includes a metal steel plate 11, and the base coat layer 12, the pattern layer 13, and the top coat layer 14 are laminated on the metal steel plate 11 in this order in this order. ing. The base coat layer 12 is arranged between the metal steel plate 11 and the pattern layer 13, and the pattern layer 13 is arranged between the base coat layer 12 and the top coat layer 14.
The topcoat layer 14 contains microcapsules.

Further, the decorative steel plate 1 is a chemical conversion coating 15 in a state of being directly laminated on the surface (sometimes referred to as the “first surface” in the present specification) 11a of the metal steel plate 11 on the top coat layer 14 side. It has.
Further, the decorative steel plate 1 includes a primer layer 16 between the metal steel plate 11 and the base coat layer 12, more specifically, between the chemical conversion coating 15 and the base coat layer 12.
Further, the decorative steel plate 1 has a back surface coat layer 17 on a surface (sometimes referred to as a "second surface" in the present specification) 11b opposite to the top coat layer 14 side of the metal steel plate 11. I have.

Further, the decorative steel plate 1 is matted on a part of the surface (sometimes referred to as "first surface" in the present specification) 13a of the pattern layer 13 on the top coat layer 14 side. It has a layer 18.
When the decorative steel plate 1 is viewed in a plan view from above on the top coat layer 14 side, the matte treatment layer 18 is linear, and the decorative steel plate 1 includes a plurality of mat treatment layers 18.
All of the matte treatment layers 18 are arranged in direct contact with the first surface 13a of the pattern layer 13, and in the region where the matte treatment layer 18 is not arranged, the pattern layer 13 and the top coat layer 14 are arranged. In direct contact. The shape of the matte treatment layer 18 when viewed in a plan view as described above is not limited to linear, and may be non-linear.

That is, in the decorative steel plate 1, the back surface coat layer 17, the metal steel plate 11, the chemical conversion coating 15, the primer layer 16, the base coat layer 12, the pattern layer 13 and the top coat layer 14 are laminated in this order in these thickness directions. Further, a matte treatment layer 18 is provided in a part of the region between the pattern layer 13 and the top coat layer 14.
Hereinafter, each layer will be described.

<Top coat layer>
The top coat layer 14 is a layer that imparts weather resistance, bending workability, scratch resistance, cleanability, and the like to the decorative steel plate 1.
As will be described later, an uneven surface is formed on the first surface 13a of the pattern layer 13 by the matte treatment layer 18, but in the decorative steel plate 1, the top coat layer 14 flattens the uneven surface. .. The surface of the topcoat layer 14 opposite to the metal steel plate 11 side (sometimes referred to as the “first surface” in the present specification) 14a is a flat surface.
The first surface 14a of the top coat layer 14 is the outermost surface of one of the decorative steel plates 1.

Further, the top coat layer 14 is transparent, and when the decorative steel plate 1 is observed from the outside on the top coat layer 14 side, the layer arranged below the top coat layer 14 can be visually recognized. There is.
The top coat layer 14 may be colorless or colored, but is preferably colorless.

The topcoat layer 14 contains microcapsules (not shown).
The decorative steel plate 1 has a novel function according to the type of the microcapsules by providing the top coat layer 14 containing the microcapsules.

The microcapsules are composed of a wall material containing a core substance.
The microcapsules may be known.

For example, microcapsules are sustained-release microcapsules that have the property that the contained core material is gradually released to the outside of the capsule over time; the contained core material gradually moves to the outside of the capsule over time. There are non-sustained release microcapsules that do not have the property of being released. Non-sustained release microcapsules include, for example, pressure-sensitive microcapsules having the property that the contained core material is released to the outside of the capsule when a pressure exceeding a certain value is applied to the microcapsules; There are non-pressure sensitive microcapsules that do not have such properties.
Among them, the microcapsules contained in the topcoat layer 14 are preferably non-sustained release microcapsules, and more preferably heat resistant microcapsules.

The wall material has a film-forming ability, preferably an oligomer or a polymer, and forms fine capsules.
The core substance is a component that expresses the main activity of microcapsules. In microcapsules, the solvent, emulsifier, etc. used in the production may be encapsulated by the wall material, but in the present specification, these encapsulated components (solvent, emulsifier, etc.) are not classified as core substances.

In the microcapsules, the constituent component of the wall material (in this specification, it may be abbreviated as "wall material component") and the core substance are not particularly limited and can be arbitrarily selected according to the purpose. ..

Regardless of whether it is sustained-release or non-sustained-release, the core substance contained in the microcapsules may be only one type, two or more types, or two or more types. If, the combination and ratio thereof can be arbitrarily selected.

Examples of the wall material component of the microcapsules include melamine resin (also known as melamine-formaldehyde resin), polyurea, polyurethane, and polyamide.
Among these, the wall material component is preferably a melamine resin in terms of high heat resistance.

As will be described later, any layer in the decorative steel plate 1 may contain a cured product of a thermosetting resin. In the manufacturing process of such a decorative steel plate 1, after forming a layer containing a thermosetting resin, this layer is heat-treated (generally referred to as "baking") to be thermoset. Cure the sex resin. As the temperature of the heat treatment at this time, for example, a high temperature of 190 ° C. or higher (190 to 280 ° C., etc.) is required. At this time, if the topcoat layer 14 contains microcapsules having insufficient heat resistance of the wall material component, the microcapsules will be destroyed, and the topcoat layer 14 will be new at the desired timing. It will not be possible to demonstrate the function of.
On the other hand, the microcapsules whose wall material component is a melamine resin have high heat resistance, and are therefore particularly suitable for use in the decorative steel plate 1 which requires the above-mentioned heat treatment (baking).

Preferred microcapsule core materials include, for example, air fresheners and the like.

Examples of the fragrance include hinoki oil, sugi oil, tea tree oil, sunplace oil, rosewood oil, cedarwood oil, flaxense oil, benzoin oil, millula oil, herbal oil, rose oil, lavender oil, and Roman chamomile. Examples include oil, jasmine oil, geranium oil, and lily oil.

An example of a preferable microcapsule is a non-sustained release aromatic microcapsule containing an aromatic agent as a core substance.
For example, when a decorative steel plate 1 containing non-sustained release and pressure-sensitive aromatic microcapsules is used, when a pressure of some certain value or more is applied to the top coat layer 14 in the decorative steel plate 1. , The fragrance is released little by little in the application area of the decorative steel plate 1.

Among these, the microcapsules are more preferably heat-resistant and aromatic microcapsules in which the wall material component is a melamine resin and contains an aromatic agent.

The average particle size of the microcapsules is not particularly limited. For example, the average particle size may be any of 0.5 to 20 μm, 1 to 16 μm, 1.5 to 13 μm, 2 to 10 μm, and 2 to 5 μm. Such microcapsules have an appropriate strength, and destruction at an unintended timing is suppressed without impairing the characteristics of the microcapsules. Here, the "unintended timing" is, for example, a state in which the decorative steel plates 1 are stacked flat or wound in a roll shape, and is stored while being pressurized under conditions different from those in actual use. It means when you are.

As used herein, the term "average particle size" means the medium diameter of a volume particle size distribution measured with a particle size distribution meter for particles, unless otherwise specified.

The thickness of the film or layer of the wall material is not particularly limited, and may be, for example, 50 to 1000 nm. The microcapsules having such a wall material have an appropriate strength, and destruction at an unintended timing is suppressed without impairing the characteristics of the microcapsules. Here, the "unintended timing" is the same as above.

Examples of the microcapsules include those produced by known methods such as an interfacial polycondensation method and an in situ polycondensation method, but the method for producing microcapsules is not limited thereto.

Regardless of whether it is sustained-release or non-sustained-release, the microcapsules contained in the topcoat layer 14 may be only one type, two or more types, or two types. In the above cases, their combinations and ratios can be arbitrarily selected.

The top coat layer 14 is preferably a layer containing the microcapsules and the resin.
Hereinafter, such a top coat layer 14 will be described.

The resin contained in the top coat layer 14 may be any of a curable resin, a cured product of a curable resin, and a non-curable resin, but is preferably a curable resin or a cured product thereof. As described above, since the top coat layer 14 is formed by using the curable resin, the weather resistance, scratch resistance, etc. of the decorative steel plate are further improved.
The curable resin in the top coat layer 14 may be either a thermosetting resin or an ionizing radiation curable resin.
Examples of the non-curable resin in the top coat layer 14 include a thermoplastic resin.

In the present specification, "ionizing radiation" means an electromagnetic wave or a charged particle beam having energy capable of curing an ionizing radiation curable resin, and specific examples thereof include ultraviolet rays, electron beams, visible rays, and X-rays. , Ion rays and the like.

Examples of the ultraviolet source include light sources such as ultra-high pressure mercury lamps, high pressure mercury lamps, low pressure mercury lamps, carbon arc lamps, black lights, and metal halide lamps.
The wavelength of ultraviolet rays is preferably 190 to 380 nm.

Examples of the electron beam source include various electron beam accelerators such as Cockcroft-Walton type, bandegraft type, resonance transformer type, insulated core transformer type, linear type, dynamitron type, and high frequency type.
The electron beam source is preferably one capable of irradiating electrons having an energy of preferably 100 to 1000 keV, more preferably 100 to 300 keV.

The ionizing thermosetting resin in the topcoat layer 14 is, for example, transparent mainly composed of a prepolymer, an oligomer or a monomer having a radically polymerizable double bond in the molecule capable of polymerizing and cross-linking by irradiation with ionizing radiation. Resin is mentioned.
The prepolymer, oligomer and monomer in the curable resin may be only one kind, two or more kinds, and when there are two or more kinds, the combination and ratio thereof are arbitrary. Can be selected.

Examples of the prepolymer, oligomer and monomer include compounds having a radically polymerizable unsaturated group such as a (meth) acryloyl group or a (meth) acryloyloxy group, or a cationically polymerizable functional group such as an epoxy group in the molecule. Be done.
Examples of the prepolymer or oligomer include a polyene / thiol-based prepolymer or oligomer obtained by combining a polyene and a polythiol.

In addition, in this specification, "(meth) acryloyl group" is a concept including both "acryloyl group" and "methacryloyl group". The same applies to terms similar to the (meth) acryloyl group. For example, "(meth) acrylic acid" is a concept that includes both "acrylic acid" and "methacrylic acid", and "(meth) acrylate". "" Is a concept that includes both "acrylate" and "methacrylate".

Examples of the prepolymer or oligomer having a radically polymerizable unsaturated group include polyester (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, melamine (meth) acrylate, triazine (meth) acrylate, and silicone (meth). ) Acrylate and the like can be mentioned.
The molecular weight of these prepolymers or oligomers is preferably 250 to 100,000, for example.

Among the monomers having a radically polymerizable unsaturated group, examples of the monofunctional monomer include methyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and phenoxyethyl (meth) acrylate.
Among the monomers having a radically polymerizable unsaturated group, examples of the polyfunctional monomer include diethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, and trimethylolpropane ethylene oxide tri. Examples thereof include (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, and dipentaerythritol hexa (meth) acrylate.

Examples of the prepolymer or oligomer having a cationically polymerizable functional group include epoxy resins such as bisphenol type epoxy resin and novolak type epoxy resin; and vinyl ether type resins such as fatty acid vinyl ether and aromatic vinyl ether.

Examples of the thiol in the polyene / thiol-based prepolymer or oligomer include polythiols such as trimethylolpropane trithioglycolate and pentaerythritol tetrathioglycolate.
Examples of the polyene in the polyene / thiol-based prepolymer or oligomer include those in which allyl alcohol is added to both ends of the molecular structure of polyurethane obtained from a diol and diisocyanate.

Examples of the thermosetting resin contained in the top coat layer 14 include polyester-based resin, acrylic-based resin, epoxy-based resin, melamine-based resin, phenol-based resin, and fluororesin.

Examples of the non-curable resin contained in the top coat layer 14 include a fluororesin (resin having a fluorine atom).
For example, the top coat layer 14 containing a curable resin and a non-curable fluororesin is mentioned as an example of preferable ones.

The resin contained in the topcoat layer 14 may be only one type, may be two or more types, and when there are two or more types, the combination and ratio thereof can be arbitrarily selected.

The topcoat layer 14 may contain other components that do not fall under any of the microcapsules and the resin.
The other components contained in the top coat layer 14 are not particularly limited and can be arbitrarily selected depending on the intended purpose.
The other components contained in the topcoat layer 14 may be only one kind, two or more kinds, or two or more kinds, the combination and ratio thereof can be arbitrarily selected. ..

Examples of the other components contained in the top coat layer 14 include weather resistant agents (ultraviolet absorbers, light stabilizers, etc.), plasticizers, stabilizers, fillers, dispersants, colorants (dye, pigment, etc.). Aggregates, solvents, matting agents and the like can be mentioned. Examples of the matting agent include the same matting agents contained in the matte treatment layer described later.

The aggregate is a component that improves the scratch resistance of the top coat layer 14.
Examples of the aggregate include transparent aggregates such as feldspar, silica sand, cold water stone, glass beads, and synthetic resin beads.
Due to the influence of the aggregate, the unevenness of the surface of the top coat layer 14 exceeds a desirable range, the matte feeling and the feel of the surface of the top coat layer 14 are deteriorated, and the adverse effect of deterioration of the design can be suppressed. The average particle size of the aggregate is preferably equal to or less than the average particle size of the matting agent in the mat treatment layer described later. When the mat treatment layer contains two or more kinds of matting agents, the average particle size of the aggregate is preferably equal to or less than the average particle size of the matting agent having the highest content.

In the top coat layer 14, the ratio of the content of the curable resin to the total content of all the resins ([amount of curable resin in the top coat layer 14 (parts by mass)] / [all in the top coat layer 14] The total content of the resin (parts by mass)] × 100) is not particularly limited, but is preferably 60 to 100% by mass, and may be 80 to 100% by mass.

When the topcoat layer 14 contains the microcapsules and the resin, the ratio of the content of the resin to the total mass of the topcoat layer 14 in the topcoat layer 14 ([Amount of resin in the topcoat layer 14 ( By mass)] / [total mass of topcoat layer 14 (parts by mass)] × 100) is preferably 80 to 97% by mass, preferably 88 to 95% by mass, regardless of the type of microcapsules and resin. It is more preferable to have.

When the topcoat layer 14 contains the microcapsules and the resin, the content of the microcapsules in the topcoat layer 14 can be appropriately adjusted according to the type of microcapsules.

For example, when the microcapsules are aromatic microcapsules, the ratio of the content of the microcapsules to the content of the resin in the top coat layer 14 ([Amount of microcapsules in the top coat layer 14 (mass). Part)] / [Amount of resin in top coat layer 14 (parts by mass)] × 100) is preferably 3% by mass or more, for example, 4% by mass or more, or 5% by mass or more. There may be. When the ratio is at least the lower limit value, the effect of using the microcapsules can be obtained more remarkably.

For example, when the microcapsules are aromatic microcapsules, the proportions are, for example, 10.5 parts by mass or less, 9.5 parts by mass or less, 8.5 parts by mass or less, and 7.5 parts by mass or less. It may be either. When the ratio is equal to or less than the upper limit value, overuse of microcapsules is suppressed.

For example, when the microcapsules are aromatic microcapsules, the ratio can be appropriately adjusted within a range set by arbitrarily combining any of the above lower limit values and any of the upper limit values. .. For example, in one embodiment, the proportion may be any of 3 to 10.5 parts by mass, 3 to 9.5 parts by mass, 3 to 8.5 parts by mass, and 3 to 7.5 parts by mass. It may be any of 4 to 10.5 parts by mass and 5 to 10.5 parts by mass, 4 to 9.5 parts by mass, 5 to 8.5 parts by mass, and 5 to 7. It may be any of 5 parts by mass.

When the top coat layer 14 contains the microcapsules and the resin, the ratio of the total content of the microcapsules and the resin to the total mass of the top coat layer 14 in the top coat layer 14 (([in the top coat layer 14]. Amount of microcapsules (parts by mass)] + [amount of resin in topcoat layer 14 (parts by mass)]) / [total mass of topcoat layer 14 (parts by mass)] x 100) Regardless of the type, it is preferably 80% by mass or more, and may be, for example, 90% by mass or more, 95% by mass or more, and 99% by mass or more.
In the top coat layer 14, the ratio of the total content is 100% by mass or less.

Although the top coat layer 14 is shown here to be only one layer, it may be a plurality of layers of two or more layers. When the top coat layer 14 is a plurality of layers, the plurality of layers may be the same or different from each other, and the combination of the plurality of layers is not particularly limited.
In addition, in this specification, not only in the case of a top coat layer, "a plurality of layers may be the same or different from each other" means "all layers may be the same, and all layers may be the same." It may be different, and only some of the layers may be the same. ”Furthermore,“ a plurality of layers are different from each other ”means that“ at least one of the materials and thicknesses of each layer is different from each other ”. Means.

The thickness of the top coat layer 14 is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 1 to 30 μm, more preferably 1 to 24 μm, and further preferably 1 to 18 μm. It is preferably 1 to 12 μm, particularly preferably 1 to 12 μm. When the thickness of the top coat layer 14 is at least the above lower limit value, the effect of having the top coat layer 14 (for example, weather resistance, bending workability, scratch resistance, cleanability) becomes higher. When the thickness of the top coat layer 14 is not more than the upper limit value, the decorative steel plate 1 can be easily bent, and the handleability of the decorative steel plate 1 becomes better.
In the present specification, the "thickness of the top coat layer" means the thickness of the entire top coat layer, and for example, the thickness of the top coat layer composed of a plurality of layers means all the layers constituting the top coat layer. Means the total thickness of.

<Metal steel plate>
The metal steel plate 11 is a plate-shaped member that serves as a base for the decorative steel plate 1.
The constituent metal of the metal steel plate 11 may be a known one.

More specific examples of the metal steel plate 11 include a hot-dip galvanized steel plate, an alloyed plated steel plate, an electrogalvanized steel plate, an aluminum plate, and the like.
The hot-dip galvanized steel plate preferably has a metal film (for example, zinc plating) on the surface of the steel plate in order to improve the adhesion to the adjacent layer and the scratch resistance.

Although the metal steel plate 11 is shown here to have only one layer, it may be a plurality of layers of two or more layers. When the metal steel plate 11 has a plurality of layers, the plurality of layers may be the same or different from each other, and the combination of the plurality of layers is not particularly limited.
That is, the metal steel plate 11 may be a single steel plate or a composite steel plate.

The thickness of the metal steel plate 11 is not particularly limited, but is preferably 200 to 2000 μm, and more preferably 350 to 600 μm. When the thickness of the metal steel plate 11 is at least the above lower limit value, the mechanical strength of the decorative steel plate 1 becomes higher. When the thickness of the metal steel plate 11 is equal to or less than the upper limit value, it is possible to prevent the decorative steel plate 1 from becoming excessive, and for example, the decorative steel plate 1 can be easily bent. The handleability of the plate 1 may be improved.
In the present specification, the "thickness of the metal steel plate" means the thickness of the entire metal steel plate. For example, the thickness of the metal steel plate composed of a plurality of layers means all the layers constituting the metal steel plate. Means the total thickness of.

<Chemical film>
The chemical conversion coating 15 improves the adhesion between the two adjacent layers, that is, the metal steel plate 11 and the primer layer 16, and also suppresses the corrosion of the metal steel plate 11.
The chemical conversion film 15 has an arbitrary structure, and the decorative steel plate 1 does not have to include the chemical conversion film 15. However, since the decorative steel plate 1 is provided with the chemical conversion coating 15, the structure of the decorative steel plate 1 is more stabilized. In particular, when the metal steel plate 11 has a metal film such as a zinc-plated film, the decorative steel plate 1 has a chemical conversion film 15 from the viewpoint of improving the corrosion resistance (for example, white rust resistance) of the metal film. It is preferable to have it.

The chemical conversion coating 15 is formed by chemical conversion treatment on the surface of the metal steel plate 11.
Examples of the chemical conversion coating 15 include a chromate coating formed by treatment with a chromate solution; a chromate-free coating formed by treatment with a treatment liquid containing no hexavalent chromium (that is, a chromate-free treatment liquid). Be done.
The chromate-free treatment liquid includes, for example, a treatment liquid containing a phosphate such as zinc phosphate, a treatment liquid containing a zirconium (Zr) salt, a treatment liquid containing a titanium (Ti) salt, a zirconium salt and a titanium salt. Examples thereof include a treatment liquid, a treatment liquid containing a cerium (Ce) salt, and a treatment liquid containing a silane coupling agent. When treated with such a treatment liquid, titanium (Ti), zirconium (Zr), phosphorus (P), cerium (Ce), silicon (Si), aluminum (Al), and lithium (Al) are formed on the galvanized film. It is possible to form a chromate-free film containing Li) or the like as a main component and not containing chromium (Cr). That is, examples of the chromate-free film include those containing one or more selected from the group consisting of titanium, zirconium, phosphorus, cerium, silicon, aluminum and lithium.

The chemical conversion coating 15 is preferably a chromate-free coating in terms of having a small environmental load.

The thickness of the chemical conversion coating 15 is not particularly limited, but is preferably 0.5 to 15 μm, and more preferably 0.5 to 3 μm. When the thickness of the chemical conversion film 15 is at least the above lower limit value, the effect of providing the chemical conversion film 15 becomes more remarkable. When the thickness of the chemical conversion film 15 is not more than the upper limit value, it is possible to prevent the thickness of the chemical conversion film 15 from becoming excessive.

<Base coat layer>
The base coat layer 12 imparts the base color of the pattern layer 13 to the decorative steel plate 1.

Examples of the base coat layer 12 include those containing a resin and a colorant.

The resin contained in the base coat layer 12 may be a known one or may be a binder resin.
Examples of the resin contained in the base coat layer 12 include a curable resin and a cured product thereof. The base coat layer 12 containing a curable resin or a cured product thereof has high durability even in an environment irradiated with light.
The curable resin contained in the base coat layer 12 is preferably a thermosetting resin, and the cured product of the curable resin is preferably a cured product of the thermosetting resin.

Examples of the thermosetting resin in the base coat layer 12 include polyester resin, urethane resin, epoxy resin, melamine resin, alkyd resin, phenol resin, acrylic resin and the like.

The resin contained in the base coat layer 12 may be only one type, may be two or more types, and when there are two or more types, the combination and ratio thereof can be arbitrarily selected.

The colorant contained in the base coat layer 12 may be a known one, and may be, for example, a pigment or a dye, but a pigment is preferable.
Examples of the colorant contained in the base coat layer 12 include the same colorants as those contained in the pattern layer 13 described later.

The colorant contained in the base coat layer 12 may be only one type, may be two or more types, and when there are two or more types, the combination and ratio thereof can be arbitrarily selected.

The base coat layer 12 may contain other components that do not fall under any of the resin and the colorant.
The other components contained in the base coat layer 12 are not particularly limited and can be arbitrarily selected depending on the intended purpose.
The other components contained in the base coat layer 12 may be only one kind, two or more kinds, or two or more kinds, the combination and ratio thereof can be arbitrarily selected.

Examples of the other components contained in the base coat layer 12 include weather resistant agents such as ultraviolet absorbers and light stabilizers.

The ultraviolet absorber contained in the base coat layer 12 may be a known one and is not particularly limited.
Examples of the ultraviolet absorber include hydroxyphenyltriazine-based ultraviolet absorbers and the like.

The light stabilizer contained in the base coat layer 12 may be a known one and is not particularly limited.
Examples of the light stabilizer include N-OR type hindered amine-based light stabilizers.

In the base coat layer 12, the ratio of the content of the resin to the total mass of the base coat layer 12 ([amount of resin in the base coat layer 12 (parts by mass)] / [total mass of the base coat layer 12 (parts by mass)] × 100 ) Is preferably 40 to 60% by mass.

In the base coat layer 12, the ratio of the content of the ultraviolet absorber to the total mass of the base coat layer 12 ([amount of ultraviolet absorber in the base coat layer 12 (parts by mass)] / [total mass of the base coat layer 12 (parts by mass). )] × 100) is preferably 0.5 to 1.5% by mass. When the ratio is at least the lower limit value, the effect of using the ultraviolet absorber can be obtained more remarkably. When the ratio is not more than the upper limit value, excessive use of the ultraviolet absorber is suppressed.

In the base coat layer 12, the ratio of the content of the light stabilizer to the total mass of the base coat layer 12 ([amount of light stabilizer in the base coat layer 12 (parts by mass)] / [total mass of the base coat layer 12 (parts by mass). )] × 100) is preferably 0.5 to 1.5% by mass. When the ratio is at least the lower limit value, the effect of using the light stabilizer can be obtained more remarkably. When the ratio is not more than the upper limit value, excessive use of the light stabilizer is suppressed.

In the base coat layer 12, the ratio of the total content of the resin and the colorant to the total mass of the base coat layer 12 (([amount of resin in the base coat layer 12 (mass part)] + [colorant in the base coat layer 12] Amount (parts by mass)]) / [total mass of base coat layer 12 (parts by mass)] × 100) is preferably 80% by mass or more, for example, 90% by mass or more, 95% by mass or more, and 99% by mass. It may be any of% or more.
In the base coat layer 12, the ratio of the total content is 100% by mass or less.

Although the base coat layer 12 is shown here to be only one layer, it may be a plurality of layers of two or more layers. When the base coat layer 12 is a plurality of layers, the plurality of layers may be the same or different from each other, and the combination of the plurality of layers is not particularly limited.

The thickness of the base coat layer 12 is not particularly limited, but is preferably 10 to 30 μm, more preferably 14 to 26 μm, and may be, for example, 18 to 22 μm. When the thickness of the base coat layer 12 is at least the above lower limit value, the effect of providing the base coat layer 12 becomes higher. When the thickness of the base coat layer 12 is not more than the upper limit value, it is possible to prevent the thickness of the base coat layer 12 from becoming excessive.
In the present specification, the "thickness of the base coat layer" means the thickness of the entire base coat layer, and for example, the thickness of the base coat layer composed of a plurality of layers is the total thickness of all the layers constituting the base coat layer. Means

<Pattern layer>
Since the decorative steel plate 1 includes the pattern layer 13, the decorative steel plate 1 has a design property when the decorative steel plate 1 is observed from the outside on the top coat layer 14 side.

The pattern of the pattern layer 13 can be arbitrarily selected according to the purpose, and is not particularly limited.
Preferred patterns include, for example, wood grain patterns, cork patterns, stone (eg marble) grain patterns, sand grain patterns, tiled patterns, brickwork patterns, cloth patterns, squeezed patterns, geometric figures, letters, symbols, and abstract patterns. , Monochromatic solid color, and a composite pattern composed by combining two or more kinds selected from these patterns (wood grain pattern to monochromatic solid color).

Examples of the pattern layer 13 include those containing a resin and a colorant.

The resin contained in the pattern layer 13 may be a known one or may be a binder resin.
Examples of the resin contained in the pattern layer 13 include a curable resin and a cured product thereof, and examples thereof include the same curable resin contained in the base coat layer 12 and a cured product thereof. The pattern layer 13 containing the curable resin or a cured product thereof has high durability even in an environment irradiated with light.
The curable resin contained in the pattern layer 13 is preferably a thermosetting resin, and the cured product of the curable resin is preferably a cured product of a thermosetting resin.

The resin contained in the pattern layer 13 may be only one type, may be two or more types, and when there are two or more types, the combination and ratio thereof can be arbitrarily selected.

The colorant contained in the pattern layer 13 may be a known colorant, and may be, for example, a pigment or a dye.
Examples of the colorant include inorganic pigments such as carbon black, titanium white (titanium oxide), zinc flower, iron composite oxide, iron oxide, petals, dark blue, and cadmium red; azo pigments, lake pigments, and anthraquinone pigments. Organic pigments such as quinacridone pigments, phthalocyanine pigments, isoindolinone pigments, dioxazine pigments; metal powder pigments such as aluminum powder and bronze powder; pearl luster pigments such as titanium oxide-coated mica and bismuth oxide; fluorescent pigments; luminous pigments; metallic Pigments and the like can be mentioned. The iron composite oxide can be used as a heat-shielding pigment.

The colorant contained in the pattern layer 13 may be only one type, may be two or more types, and when there are two or more types, the combination and ratio thereof can be arbitrarily selected.

The pattern layer 13 may contain other components that do not correspond to any of the resin and the colorant.
The other components contained in the pattern layer 13 are not particularly limited and can be arbitrarily selected depending on the intended purpose.
The other components contained in the pattern layer 13 may be only one type, two or more types, or two or more types, and the combination and ratio thereof can be arbitrarily selected.

In the pattern layer 13, the ratio of the content of the resin to the total mass of the pattern layer 13 ([amount of resin in the pattern layer 13 (mass part)] / [total mass of the pattern layer 13 (mass part)] × 100 ) Is preferably 40 to 80% by mass.

In the pattern layer 13, the ratio of the content of the colorant to the content of the resin ([amount of colorant in the pattern layer 13 (parts by mass)] / [amount of resin in the pattern layer 13 (parts by mass)). ] × 100) is preferably 80 to 120% by mass. When the ratio is at least the lower limit value, the effect of using the colorant can be obtained more remarkably. When the ratio is not more than the upper limit value, excessive use of the colorant is suppressed.

In the pattern layer 13, the ratio of the total content of the resin and the colorant to the total mass of the pattern layer 13 (([amount of resin in the pattern layer 13 (mass part)] + [colorant in the pattern layer 13] Amount (parts by mass)]) / [total mass (parts by mass) of the pattern layer 13] × 100) is preferably 80% by mass or more, for example, 90% by mass or more, 95% by mass or more, and 99% by mass. It may be any of% or more.
In the pattern layer 13, the ratio of the total content is 100% by mass or less.

Although the pattern layer 13 shows only one layer here, it may be a plurality of layers having two or more layers. When the pattern layer 13 is a plurality of layers, the plurality of layers may be the same or different from each other, and the combination of the plurality of layers is not particularly limited.

The thickness of the pattern layer 13 is not particularly limited, but is preferably 0.1 to 1.3 μm, more preferably 0.1 to 1 μm, for example, 0.1 to 0.5 μm, and 0. It may be any one of .1 to 0.2 μm. When the thickness of the pattern layer 13 is at least the lower limit value, the effect of having the pattern layer 13 (for example, the design of the decorative steel plate 1) becomes higher. When the thickness of the pattern layer 13 is equal to or less than the upper limit value, it is possible to prevent the decorative steel plate 1 from becoming excessive, and for example, the decorative steel plate 1 can be easily bent. The handleability of 1 may be improved.
In the present specification, the "thickness of the pattern layer" means the thickness of the entire pattern layer, and for example, the thickness of the pattern layer composed of a plurality of layers is the total thickness of all the layers constituting the pattern layer. Means

<Matte treatment layer>
Since the decorative steel plate 1 is provided with the matte treatment layer 18, it has a three-dimensional effect due to the tactile sensation, and also has a three-dimensional effect visually when the decorative steel plate 1 is observed from the outside on the top coat layer 14 side. , Has high design.
The matte treatment layer 18 has an arbitrary structure, and the decorative steel plate 1 does not have to include the matte treatment layer 18. However, for the above reasons, the decorative steel plate 1 preferably includes a matte treatment layer 18.

As described above, the matte treatment layer 18 is provided on a part of the first surface 13a of the pattern layer 13. As a result, an uneven surface is formed on the first surface 13a of the pattern layer 13.

The arrangement position of the matte processing layer 18 on the first surface 13a of the pattern layer 13 can be arbitrarily set, but is preferably adjusted according to the pattern on the first surface 13a, for example, the first surface 13a. It may be arranged along the line constituting the pattern in. For example, when the pattern on the first surface 13a of the pattern layer 13 is a wood grain pattern, the linear or non-linear matte treatment layer 18 is arranged along the conduit forming the wood grain pattern. May be good.

Examples of the matte treatment layer 18 include those containing a resin and a matting agent.

The resin contained in the matte treatment layer 18 may be a known one or may be a binder resin.
Examples of the resin contained in the matte treatment layer 18 include a curable resin and a cured product thereof.
The curable resin in the matte treatment layer 18 may be either a thermosetting resin or an ionizing radiation curable resin.
The matte treatment layer 18 containing a curable resin or a cured product thereof has high durability even in an environment irradiated with light.

Examples of the thermosetting resin and its cured product contained in the matte treatment layer 18 include the same curable resin and its cured product contained in the base coat layer 12, and further, a two-component curable resin and its curing. Things can also be mentioned.
Examples of the ionizing radiation curable resin contained in the matte treatment layer 18 and its cured product include the same ionizing radiation curable resin contained in the top coat layer 14 and its cured product.

The resin contained in the matte treatment layer 18 may be only one type, may be two or more types, and when there are two or more types, the combination and ratio thereof can be arbitrarily selected.

The matting agent contained in the matte treatment layer 18 may be a known one.
Examples of the matting agent contained in the mat treatment layer 18 include inorganic fine particles such as silica, calcium carbonate, synthetic mica, and titanium oxide glass particles; polyethylene fine particles, acrylic resin fine particles, urethane resin fine particles, urea resin fine particles, and nylon resin fine particles. , Organic fine particles such as balloons.

The average particle size of the matting agent contained in the matting layer 18 is preferably 100 to 200% with respect to the thickness of the topcoat layer 14, for example. When the average particle size of the matting agent is in such a range, the decorative steel plate 1 has a higher three-dimensional effect due to the visual sense and the tactile sensation described above, and the design of the decorative steel plate 1 becomes higher.

The matting agent contained in the matte treatment layer 18 may be only one type, may be two or more types, and when there are two or more types, the combination and ratio thereof can be arbitrarily selected.

The mat treatment layer 18 may contain other components that do not fall under any of the resin and the matting agent.
The other components contained in the matte treatment layer 18 are not particularly limited and can be arbitrarily selected depending on the intended purpose.
The other components contained in the matte treatment layer 18 may be only one type, two or more types, and when two or more types, the combination and ratio thereof can be arbitrarily selected. ..

Examples of the other components contained in the matte treatment layer 18 include aggregates, pigments, and weather resistant agents.
Examples of the aggregate include those similar to the aggregate contained in the top coat layer 14.
Examples of the pigment include the same pigments in the colorant contained in the pattern layer 13.
Examples of the weather resistant agent include the same weather resistant agents as those in the other components contained in the base coat layer 12.

In the mat treatment layer 18, the ratio of the content of the resin to the total mass of the mat treatment layer 18 ([amount of resin in the mat treatment layer 18 (parts by mass)] / [total mass of the mat treatment layer 18 (parts by mass) )] × 100) is preferably 70 to 90% by mass.

In the mat treatment layer 18, the ratio of the content of the matting agent to the content of the resin ([amount of matting agent in the matting layer 18 (parts by mass)] / [amount of resin in the matting layer 18 ( [Mass part)] × 100) is preferably 5 to 20% by mass. When the ratio is at least the lower limit value, the effect of using the matting agent can be obtained more remarkably. When the ratio is not more than the upper limit value, excessive use of the matting agent is suppressed.

In the mat treatment layer 18, the ratio of the total content of the resin and the matting agent to the total mass of the mat treatment layer 18 (([amount of resin in the mat treatment layer 18 (parts by mass)] + [in the mat treatment layer 18] [Amount of matting agent (parts by mass)]) / [total mass (parts by mass) of matte treatment layer 18] × 100) is preferably 80% by mass or more, for example, 90% by mass or more, 95% by mass. It may be either the above and 99% by mass or more.
In the matte treatment layer 18, the ratio of the total content is 100% by mass or less.

Although the matte treatment layer 18 shows only one layer here, it may be a plurality of layers of two or more layers. When the matte treatment layer 18 is a plurality of layers, the plurality of layers may be the same or different from each other, and the combination of the plurality of layers is not particularly limited.

The thickness of the matte treatment layer 18 is not particularly limited, but is preferably 1 to 30 μm, and more preferably 5 to 15 μm. When the thickness of the matte treatment layer 18 is equal to or greater than the lower limit value, the effect of providing the matte treatment layer 18 (that is, the above-mentioned three-dimensional effect by sight and three-dimensional effect by touch is enhanced, and the decorative steel plate 1 (Effect of increasing the design of) becomes higher. When the thickness of the matte treatment layer 18 is equal to or less than the upper limit value, it is possible to prevent the decorative steel plate 1 from becoming excessive, and for example, the decorative steel plate 1 can be easily bent. The handleability of the plate 1 may be improved.
In the present specification, the "thickness of the matte treatment layer" means the thickness of the entire matte treatment layer, and for example, the thickness of the matte treatment layer composed of a plurality of layers means all the layers constituting the matte treatment layer. Means the total thickness of.

<Primer layer>
The primer layer 16 improves the adhesion between the metal steel plate 11 or the chemical conversion coating 15 and the base coat layer 12, and further improves the corrosion resistance of the metal steel plate 11.
The primer layer 16 has an arbitrary structure, and the decorative steel plate 1 does not have to include the primer layer 16. However, for the above reasons, it is preferable that the decorative steel plate 1 includes the primer layer 16.

The primer layer 16 may be a known one.
Examples of the primer layer 16 include those containing a primer resin, and examples of the primer resin include polyester resin, urethane resin, epoxy resin, melamine resin, alkyd resin, phenol resin, and acrylic resin. Examples thereof include a thermosetting resin such as a resin and a cured product thereof.

The primer layer 16 may contain a rust preventive pigment. Since the primer layer 16 contains the rust preventive pigment, the corrosion resistance of the metal steel plate 11 is further improved in the decorative steel plate 1.
The rust preventive pigment contained in the primer layer 16 may be a known one.

The resin and the rust preventive pigment contained in the primer layer 16 may be of only one type, may be two or more types, and when they are two or more types, the combination and ratio thereof may be arbitrary. You can choose.

Although the primer layer 16 is shown here as having only one layer, it may be a plurality of layers having two or more layers. When the primer layer 16 is a plurality of layers, the plurality of layers may be the same or different from each other, and the combination of the plurality of layers is not particularly limited.
Usually, one primer layer 16 is sufficient.

The thickness of the primer layer 16 is not particularly limited, but is preferably 1 to 10 μm. When the thickness of the primer layer 16 is at least the lower limit value, the effect of providing the primer layer 16 (that is, the effect of improving the adhesion and corrosion resistance described above) becomes higher. When the thickness of the primer layer 16 is not more than the upper limit value, it is possible to prevent the decorative steel plate 1 from becoming excessive, and for example, the decorative steel plate 1 can be easily bent. The handleability of 1 may be improved.
In the present specification, the "thickness of the primer layer" means the thickness of the entire primer layer, and for example, the thickness of the primer layer composed of a plurality of layers is the total thickness of all the layers constituting the primer layer. Means

<Back coat layer>
The back surface coating layer 17 covers the second surface 11b of the metal steel plate 11.
The surface (sometimes referred to as the “second surface” in the present specification) 17b of the back surface coating layer 17 opposite to the metal steel plate 11 side is the other outermost surface of the decorative steel plate 1.

The back surface coating layer 17 has an arbitrary structure, and the decorative steel plate 1 does not have to include the back surface coating layer 17. However, since the decorative steel plate 1 includes the back surface coating layer 17, the second surface 11b of the metal steel plate 11 is protected.

The back surface coating layer 17 may be a known one.
Examples of the back surface coating layer 17 include a coating resin containing a thermosetting resin such as a polyester resin or an epoxy resin, or a cured product thereof as a main component.

The coating resin contained in the back surface coating layer 17 may be only one type, may be two or more types, and when there are two or more types, the combination and ratio thereof can be arbitrarily selected.

Although the back surface coating layer 17 shows only one layer here, it may be a plurality of layers of two or more layers. When the back surface coating layer 17 is a plurality of layers, the plurality of layers may be the same or different from each other, and the combination of the plurality of layers is not particularly limited.
Usually, one layer is sufficient for the back surface coating layer 17.

The thickness of the back surface coating layer 17 is not particularly limited, but is preferably 1 to 10 μm. When the thickness of the back surface coating layer 17 is at least the above lower limit value, the effect of providing the back surface coating layer 17 becomes higher. When the thickness of the back surface coating layer 17 is equal to or less than the upper limit value, it is possible to prevent the decorative steel plate 1 from becoming excessive, and for example, the decorative steel plate 1 can be easily bent. The handleability of the plate 1 may be improved.
In the present specification, the "thickness of the back surface coating layer" means the thickness of the entire back surface coating layer, and for example, the thickness of the back surface coating layer composed of a plurality of layers means all the layers constituting the back surface coating layer. Means the total thickness of.

In the decorative steel plate 1, when this is observed from the outside on the top coat layer 14 side, the pattern layer 13 can be visually recognized through the top coat layer 14, and the decorative steel plate 1 is the pattern layer 13 of the decorative steel plate 1. It has a design depending on its existence.
Further, the decorative steel plate 1 includes a top coat layer 14 containing microcapsules, and has a new function depending on the type of the microcapsules.

When the decorative steel plate 1 is used, for example, a jig is provided at any part of the decorative steel plate 1, and the decorative steel plate 1 can be fixed to a target location by the jig.

The decorative steel plate of the present embodiment is not limited to the one shown in FIG. 1, and a part of the structure shown in FIG. 1 is changed, deleted or added within the range not impairing the effect of the present invention. It may be.

For example, the decorative steel plate 1 shown in FIG. 1 includes a back surface coating layer 17, a metal steel plate 11, a chemical conversion coating 15, a primer layer 16, a base coating layer 12, a pattern layer 13, a top coating layer 14, and a matte treatment layer 18. However, the decorative steel plate of the present embodiment may include other layers that do not fall under any of these.
The other layer is not particularly limited, and the type and thickness thereof can be arbitrarily selected depending on the intended purpose.

FIG. 2 is a cross-sectional view schematically showing another example of the decorative steel plate of the present embodiment.
In the drawings after FIG. 2, the same components as those shown in the already explained figures are designated by the same reference numerals as in the case of the already explained figures, and detailed description thereof will be omitted.

The decorative steel plate 2 shown in FIG. 2 is further provided with a second chemical conversion coating 19 in a state of being directly laminated on the second surface 11b of the metal steel plate 11, except that the decorative steel plate 1 shown in FIG. 1 is provided. Is the same as. In the decorative steel plate 2, the second chemical conversion coating 19 is arranged between the back surface coating layer 17 and the metal steel plate 11.
In the present embodiment, when the decorative steel plate is provided with the second chemical conversion coating, the chemical conversion coating provided on the first surface of the metal steel plate (for example, the chemical conversion coating 15 shown in FIG. 1) is first formed. Called a coating.
That is, in the decorative steel plate 2, the back surface coat layer 17, the second chemical conversion coating 19, the metal steel plate 11, the first chemical conversion coating 15, the primer layer 16, the base coat layer 12, the pattern layer 13, and the top coat layer 14 are in this order. It is laminated in these thickness directions, and further, a matte treatment layer 18 is provided in a part of a region between the pattern layer 13 and the top coat layer 14.

The second chemical conversion coating 19 is the same as the first chemical conversion coating 15 (the chemical conversion coating 15 in the decorative steel plate 1) except that the arrangement positions are different.

In the decorative steel plate 2, when this is observed from the outside on the top coat layer 14 side, the pattern layer 13 can be visually recognized through the top coat layer 14, and the decorative steel plate 2 has the pattern layer 13 of the decorative steel plate 2. It has a design depending on its existence.
Further, the decorative steel plate 2 includes a top coat layer 14 containing microcapsules, and has a new function depending on the type of the microcapsules.

The method of using the decorative steel plate 2 is the same as the method of using the decorative steel plate 1 described above.

Further, as described above, the decorative steel plate 1 shown in FIG. 1 does not have to include the matte treatment layer 18.
3 and 4 are cross-sectional views schematically showing still another example of the decorative steel plate of the present embodiment.

The decorative steel plate 3 shown in FIG. 3 is the same as the decorative steel plate 1 shown in FIG. 1 except that the matte treatment layer 18 is not provided.
That is, in the decorative steel plate 3, the back surface coating layer 17, the metal steel plate 11, the chemical conversion coating 15, the primer layer 16, the base coating layer 12, the pattern layer 13 and the top coating layer 14 are laminated in this order in these thickness directions. It is composed.

Since the decorative steel plate 3 includes the pattern layer 13 and the top coat layer 14, the decorative steel plate 3 has the same effect as that of the decorative steel plate 1.
The method of using the decorative steel plate 3 is the same as the method of using the decorative steel plate 1 described above.

The decorative steel plate 4 shown in FIG. 4 is the same as the decorative steel plate 2 shown in FIG. 2 except that the matte treatment layer 18 is not provided.
That is, in the decorative steel plate 4, the back surface coat layer 17, the second chemical conversion coating 19, the metal steel plate 11, the first chemical conversion coating 15, the primer layer 16, the base coat layer 12, the pattern layer 13, and the top coat layer 14 are in this order. It is constructed by being laminated in these thickness directions.

Since the decorative steel plate 4 includes the pattern layer 13 and the top coat layer 14, the decorative steel plate 4 has the same effect as that of the decorative steel plate 1.
The method of using the decorative steel plate 4 is the same as the method of using the decorative steel plate 1 described above.

<< Manufacturing method of decorative steel plate >>
The decorative steel plate of the present embodiment is obtained by, for example, laminating the metal steel plate, the base coat layer, the pattern layer and the top coat layer so that their arrangement order in the thickness direction is as follows. Can be manufactured.
The order in which each layer is laminated (which layer to stack from) is not particularly limited and can be arbitrarily selected.

Further, as the decorative steel plate provided with the chemical conversion coating (first chemical conversion coating), for example, in the above step, the metal steel plate in which the chemical conversion coating (first chemical conversion coating) is provided is used, and the chemical conversion coating (first chemical conversion coating) is used. It can be manufactured by laminating a metal steel plate with the first chemical conversion film) facing the top coat layer side.

Further, as the decorative steel plate provided with the second chemical conversion film, for example, in the above step, the metal steel plate in a state where the second chemical conversion film is provided is used, and the second chemical conversion film is referred to as the top coat layer side. It can be manufactured by laminating metal steel plates toward the opposite side.

Further, in the decorative steel plate provided with the matte treatment layer, for example, in addition to the above steps, a surface (first surface) between the pattern layer and the top coat layer and on the top coat layer side of the pattern layer. ), It can be manufactured by laminating a matte treatment layer on a part of the region.

Further, among the decorative steel sheets provided with the primer layer, the decorative steel sheet not provided with the chemical conversion film (first chemical conversion film) is, for example, in addition to the above steps, the metal steel sheet and the base coat layer. It can be produced by laminating these layers so that the primer layers are arranged between them.
On the other hand, among the decorative steel sheets provided with the primer layer, the decorative steel sheets provided with the chemical conversion film (first chemical conversion film) are, for example, in addition to the above steps, the chemical conversion film (first chemical conversion film) and the above. It can be produced by laminating these layers so that the primer layer is arranged between the base coat layer and the base coat layer.

Further, among the decorative steel sheets provided with the back surface coating layer, the decorative steel sheet not provided with the second chemical conversion film is, for example, opposite to the top coat layer side of the metal steel sheet in addition to the above steps. It can be manufactured by laminating a back surface coating layer on the side surface (second surface) side.
On the other hand, among the decorative steel plates provided with the back surface coating layer, the decorative steel plate provided with the second chemical conversion coating is, for example, in addition to the above steps, on the side opposite to the metal steel plate side of the second chemical conversion coating. It can be manufactured by laminating a back surface coating layer on the surface side.
Next, a more specific forming method and laminating method of each layer will be described.

In the topcoat layer, for example, a composition containing components for constituting the topcoat layer (in this specification, it may be referred to as a “composition for a topcoat layer”) is placed on a plane of symmetry of formation of the topcoat layer. It can be formed by coating, drying, and curing if necessary (curing the components contained in the topcoat layer).

Examples of the composition for the top coat layer include those containing the microcapsules, the resin and the solvent.
In the present specification, unless otherwise specified, the component corresponding to the dispersion medium in the dispersion liquid is also referred to as "solvent".
The contents of the microcapsules and the resin of the composition for the top coat layer may be adjusted so that the contents of the microcapsules and the resin of the top coat layer satisfy the conditions described above.

The composition for the top coat layer can be coated, dried and cured by a known method.

Examples of the method for applying the composition for the top coat layer include a roll coating method, a curtain flow coating method, a wire bar coating method, a reverse coating method, a gravure coating method, a gravure reverse coating method, an air knife coating method, and a kiss coating method. , Blade coat method, smooth coat method, comma coat method and the like.
The composition for the top coat layer may be dried by a known method, for example, under normal pressure, under reduced pressure, or under blowing conditions, and under any of atmospheric conditions and an inert gas atmosphere. It may be either heat-dried or room-temperature dried. The drying temperature is not particularly limited, and may be 190 to 280 ° C., for example, when drying and baking are performed at the same time.

The composition for the top coat layer can be thermoset by heating at 200 to 280 ° C. for 30 to 60 seconds, and this curing condition is an example.
The composition for the top coat layer can be ionized and radiation cured by a known method.

The composition for the top coat layer can be produced by blending the components for constituting the composition.
For example, at the time of producing the microcapsules, the microcapsules are obtained as a dispersion such as an aqueous dispersion thereof, and the dispersion is used as it is or as a treated dispersion obtained by post-treatment, as a solvent (dispersion medium). ) Etc. may be blended, or the dispersion of microcapsules may be dried by a drying treatment such as a spray-drying method, and the obtained powder may be blended.
The contents of the microcapsules, the resin and the solvent of the composition for the top coat layer may be adjusted so that the contents of the microcapsules and the resin of the top coat layer satisfy the conditions described above.

The chemical conversion coating (first chemical conversion coating, second chemical conversion coating) can be formed by chemical conversion treatment on the surface of the metal steel plate as described above.

In the base coat layer, for example, a composition containing components for constituting the base coat layer (sometimes referred to as “base coat layer” in the present specification) is applied to a symmetrical plane of formation of the base coat layer and dried. It can be formed by curing (curing the components contained in the base coat layer) as necessary.

Examples of the composition for the base coat layer include those containing the resin, the colorant and the solvent, and may be either a solution or a dispersion.
The content of the resin, colorant and solvent of the composition for the base coat layer may be adjusted so that the content of the resin and colorant of the base coat layer satisfies the condition described above.

The coating, drying and curing of the composition for the base coat layer can be carried out, for example, in the same manner as for the composition for the top coat layer.

In the pattern layer, for example, a composition containing a component for constituting the pattern layer (in this specification, it may be referred to as a “composition for a pattern layer”) is attached to a plane of symmetry of formation of the pattern layer. It can be formed by drying and curing as necessary (curing the components contained in the pattern layer).
The composition for the picture layer can be produced by blending the components for constituting the composition.

Examples of the composition for the pattern layer include those containing the resin, the colorant and the solvent, and may be either a solution or a dispersion.
The contents of the resin, the colorant and the solvent of the composition for the picture layer may be adjusted so that the contents of the resin and the colorant of the picture layer satisfy the conditions described above.

Examples of the method for adhering the composition for the pattern layer include a printing method, a coating method, a hand-painting method, a suminagashi method, and the like.
Examples of the printing method include a gravure printing method, an offset printing method, a screen printing method, a flexographic printing method, an electrostatic printing method, an inkjet printing method, and the like.
Examples of the coating method include a gravure coating method, a roll coating method, a knife coating method, an air knife coating method, a die coating method, a lip coating method, a comma coating method, a kiss coating method, a flow coating method, and a dip coating method. ..
Further, each of the above methods is combined with one or more other methods such as a photographic method, a transfer method, a laser beam drawing method, an electron beam drawing method, a partial vapor deposition method for metals, an etching method, and the like. May be good.

The composition for the picture layer can be dried and cured in the same manner as for the composition for the top coat layer, for example.

In the mat treatment layer, for example, a composition containing components for constituting the mat treatment layer (in this specification, it may be referred to as a “composition for a mat treatment layer”) is placed on a plane of symmetry of formation of the mat treatment layer. It can be formed by adhering, drying, and curing if necessary (curing the components contained in the matte treatment layer).
The composition for the matte treatment layer can be produced by blending the components for constituting the composition.

Examples of the composition for the matte treatment layer include those containing the resin, the matting agent and the solvent, and may be either a solution or a dispersion liquid.
The contents of the resin, the matting agent and the solvent of the composition for the matte treatment layer may be adjusted so that the contents of the resin and the matting agent of the matte treatment layer satisfy the conditions described above.

The method of adhering the composition for the matte treatment layer is preferably a printing method.
Examples of the printing method include a method using a printing plate, such as a gravure printing method and an offset printing method.
The composition for the matte treatment layer can be dried and cured in the same manner as for the composition for the top coat layer, for example.

In the primer layer, for example, a composition containing a component for constituting the primer layer (in this specification, it may be referred to as a "primer agent") is applied to a plane of symmetry of formation of the primer layer and dried. It can be formed by curing (curing the components contained in the primer layer) as necessary.
The primer agent can be produced by blending the components for constituting the primer agent, and may be either a solution or a dispersion.
A commercially available product may be used as the primer agent.

The primer agent can be applied, dried and cured, for example, in the same manner as in the case of the composition for the top coat layer.

For the back surface coating layer, for example, a composition containing a component for constituting the back surface coating layer (in this specification, it may be referred to as a “back surface coating agent”) is applied to a symmetrical surface of the back surface coating layer. It can be formed by drying and curing if necessary (curing the components contained in the back surface coat).
The back surface coating agent can be produced by blending the components for constituting the back surface coating agent, and may be either a solution or a dispersion.
A commercially available product may be used as the back surface coating agent.

The coating, drying and curing of the back surface coating agent can be performed, for example, in the same manner as in the case of the composition for the top coat layer.

Hereinafter, the present invention will be described in more detail with reference to specific examples. However, the present invention is not limited to the examples shown below.

[Example 1]
<< Manufacture of decorative steel plate >>
<Manufacturing of aromatic microcapsules>
As an emulsifier, an aqueous solution of a styrene maleic anhydride copolymer (“Script Set 520” manufactured by Solenis, 150 g) having a pH adjusted to 4.5 with sodium hydroxide and having a concentration of 3.3% by mass was prepared. And hinoki oil (52.8 g), which is an air freshener, were put in a beaker. Then, using an emulsifier (manufactured by Primix Corporation), these were emulsified under the conditions of a rotation speed of 10000 rpm and a time of 5 minutes to obtain an emulsified solution.

Separately, melamine (5.1 g manufactured by Kanto Chemical Co., Inc.) and an aqueous formaldehyde solution (manufactured by Kanto Chemical Co., Inc. 10.1 g) having a concentration of 37% by mass are mixed, and water having a concentration of 40% by mass is added thereto. The pH of the obtained mixture was adjusted to 8.5 to 9.5 by adding an aqueous sodium oxide solution, and the mixture was heated and stirred at 80 ° C. to obtain a methylolated melamine initial condensate.
Next, polycondensation was carried out by adding the entire amount of this methylolated melamine initial condensate to the total amount of the emulsion obtained above and stirring at 80 ° C. for 120 minutes.

Next, the obtained reaction solution was cooled to room temperature, and the pH of the reaction solution was adjusted to about 7 by adding an aqueous sodium hydroxide solution having a concentration of 40% by mass to the cooled reaction solution. ..
As described above, non-sustained release aromatic microcapsules containing melamine resin as a wall material component and hinoki cypress oil as an air freshener were obtained as an aqueous dispersion.

As a result of measuring the volume particle size distribution of the heat storage microcapsules obtained above using an electrical detection band type particle size distribution meter (“Multusizer 3” manufactured by Beckman Coulter), the medium diameter, that is, the average particle diameter Was 2.6 μm.

Using a spray-drying device (“ADL-311SA” manufactured by Yamato Scientific Co., Ltd.), water is removed from the aqueous dispersion obtained above by a spray-drying method, and the powder is dried to obtain the powder of the aromatic microcapsules. Obtained.

<Manufacturing of top coat layer composition and decorative steel plate>
<Manufacturing of composition for top coat layer>
A matting agent (10 parts by mass) and the above with respect to a resin composition containing a thermosetting polyester resin (manufactured by Nippon Paint Industrial Coatings) (100 parts by mass as the amount of polyester) at room temperature. The obtained aromatic microcapsule powder (6.8 parts by mass) was added and stirred to obtain a composition for a top coat layer.

<Manufacturing of decorative steel plate>
A target metal steel plate was obtained by hot-dip galvanizing one surface (first surface) of a steel plate having a thickness of 400 μm according to JIS G 3302.
Next, one surface (first surface) of the metal steel plate was subjected to chemical conversion treatment by phosphate treatment to form a chemical conversion coating (thickness 1 μm) on the metal steel plate.
Next, a polyester-based primer resin was used, and this was applied to the exposed surface of the chemical conversion coating on the side opposite to the metal steel plate side by a gravure offset printing method and dried to obtain a primer resin layer (thickness 2 μm). Formed.

Next, the composition for the base coat layer is applied to the exposed surface of the primer resin layer opposite to the chemical conversion film side by a gravure offset printing method, and hot air at 240 ° C. is blown using a hot air dryer to coat the base coat. The layer composition is dried and heat-cured (in other words, baked), and at the same time, the primer resin layer is also heat-cured (baked), so that the primer layer (thickness 2 μm) and the base coat layer (thickness 20 μm) are formed. ) Was formed. As the composition for the base coat layer, a composition containing a thermosetting polyester resin (100 parts by mass) and an inorganic pigment containing titanium oxide, iron oxide and other composite oxides (100 parts by mass) is used. There was.

Next, the composition for the pattern layer is applied to the exposed surface of the base coat layer on the side opposite to the primer layer side by the gravure offset printing method, and hot air at 230 ° C. is blown using a hot air dryer for the pattern layer. The composition was dried and heat-cured (in other words, baked) to form a pattern layer (thickness 1 μm) on the base coat layer. As the composition for the pattern layer, a composition containing a thermosetting polyester resin (100 parts by mass) and an inorganic pigment containing titanium oxide, iron oxide and other composite oxides (100 parts by mass) is used. There was.

Next, the composition for the top coat layer obtained above was applied to the exposed surface (first surface) of the pattern layer opposite to the base coat layer side by a gravure offset printing method, and a hot air dryer was used. A top coat layer (thickness 10 μm) was formed on the pattern layer by blowing hot air at 270 ° C. to dry the composition for the top coat layer and heat-curing it (in other words, baking).
Based on the above, metal steel plate (thickness 400 μm), chemical conversion film (thickness 1 μm), primer layer (thickness 2 μm), base coat layer (thickness 20 μm), pattern layer (thickness 1 μm) and top coat layer (thickness). 10 μm) were laminated in this order in these thickness directions to obtain a decorative steel plate.

<< Evaluation of decorative steel plate >>
<Aromaticity evaluation>
Thirty evaluators confirmed the number of evaluators who felt the scent of cypress when they smelled the decorative steel plate obtained above. Then, based on the number, the aromaticity of the decorative steel plate was evaluated according to the following criteria. The results are shown in Table 1.
A: The number of evaluators who felt the scent of cypress was 25 to 30.
B: The number of evaluators who felt the scent of cypress was 20 to 24.
C: The number of evaluators who felt the scent of cypress was 0 to 19.

<Evaluation of solvent resistance>
The exposed surface (first surface) of the top coat layer in the decorative steel plate obtained above was rubbed with a non-woven fabric containing xylene by linearly reciprocating 30 times while applying a load of 750 g. Then, the rubbed portion on the first surface was visually observed, and the solvent resistance of the decorative steel plate was evaluated according to the following criteria. The results are shown in Table 1.
A: No change was observed in the appearance of the rubbed portion as compared with that before rubbing.
B: The rubbed portion had a slight change in gloss as compared with that before rubbing.
C: There was a big change in the gloss of the rubbed part as compared with before rubbing.

<Evaluation of scratch resistance (nail scratch test)>
The exposed surface (first surface) of the top coat layer in the decorative steel plate obtained above was rubbed with a nail. Then, the rubbed portion on the first surface was visually observed, and the scratch resistance of the decorative steel plate was evaluated according to the following criteria. The results are shown in Table 1.
A: No scratches were found on the rubbed area.
B: Scratches were found on the rubbed area.

<< Manufacture and evaluation of decorative steel sheets >>
[Reference example 1]
The same method as in Example 1 except that the amount of powder added to the aromatic microcapsules was 1.1 parts by mass instead of 6.8 parts by mass during the production of the composition for the topcoat layer. The decorative steel plate was manufactured and evaluated. The results are shown in Table 1.

[Reference example 2]
The same method as in Example 1 except that the amount of the powder of the aromatic microcapsules added was 2.3 parts by mass instead of 6.8 parts by mass at the time of producing the composition for the top coat layer. The decorative steel plate was manufactured and evaluated. The results are shown in Table 1.

[Reference example 3]
The same method as in Example 1 except that the amount of the powder of the aromatic microcapsules added was 11.3 parts by mass instead of 6.8 parts by mass at the time of producing the composition for the top coat layer. The decorative steel plate was manufactured and evaluated. The results are shown in Table 1.

[Reference example 4]
The same method as in Example 1 except that the amount of the powder of the aromatic microcapsules added was 22.6 parts by mass instead of 6.8 parts by mass at the time of producing the composition for the top coat layer. The decorative steel plate was manufactured and evaluated. The results are shown in Table 1.

[Comparative Example 1]
At the time of producing the composition for the top coat layer, the amount of the powder of the aromatic microcapsules added was set to 0 parts by mass instead of 6.8 parts by mass, that is, the resin composition as the composition for the top coat layer. Was used as it is, except for the point, the decorative steel plate was manufactured and evaluated by the same method as in the case of Example 1. The results are shown in Table 1.

As is clear from the above results, the decorative steel plate of Example 1 had a good aromaticity and had characteristics not found in the conventional decorative steel plate. Further, the decorative steel plate of Example 1 had good solvent resistance and scratch resistance, and had particularly excellent characteristics as a decorative steel plate.

The decorative steel plates of Reference Examples 1 and 2 were inferior in aromaticity to the decorative steel plates of Example 1 because the amount of aromatic microcapsules used was too small.
The decorative steel plates of Reference Examples 3 to 4 were inferior to the decorative steel plates of Example 1 in solvent resistance and scratch resistance because the amount of aromatic microcapsules used was too large.

On the other hand, the decorative steel plate of Comparative Example 1 did not have any aromaticity because it did not use aromatic microcapsules.

The present invention can be used as a building material.

1,2,3,4 ... decorative steel plate, 11 ... metal steel plate, 11a ... first surface of metal steel plate, 12 ... base coat layer, 13 ... pattern layer, 14.・ ・ Top coat layer

Claims (2)

A metal steel plate is provided, and a base coat layer, a pattern layer, and a top coat layer are laminated in this order on the metal steel plate in these thickness directions.
A decorative steel plate in which the top coat layer contains microcapsules. The decorative steel plate according to claim 1, wherein the component of the wall material of the microcapsules is a melamine resin.

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