JP7600629B2 - Decorative panels - Google Patents

Description

The present invention relates to a decorative plate in which a decorative coating is applied to a metal plate, such as a hot-dip galvanized steel plate or an aluminum plate, by painting or printing.

One example of a technology for decorative plates in which a decorative metal plate is applied is the technology disclosed in Patent Document 1. In the technology disclosed in Patent Document 1, a primer layer, a base coat layer, a design layer, a matte print layer that is provided on the design layer to form irregularities, and a clear coat layer that fills in the irregularities in the matte print layer are formed on one side of a metal plate.

JP 2017-164924 A

By the way, wooden garage shutters are recognized as the most luxurious of all garage shutters, due to the unique warmth and elegance that wood possesses. However, the wooden shutter material used for wooden garage shutters is very noticeable when the paint peels off, so maintenance such as repainting is required every few years. Furthermore, wood can warp due to moisture, develop mold, and be damaged by termites, making maintenance time-consuming.

Therefore, by using the technology disclosed in Patent Document 1 to form a decorative panel in which a sheet with a wood grain print is laminated onto a base material, it is possible to form a garage shutter that is easy to maintain.

However, there is a problem with the decorative panels formed using the technology disclosed in Patent Document 1 in that it is difficult for the decorative panels to exhibit high performance as a shutter material in terms of, for example, sliding properties, scratch resistance, processability, blocking resistance, weather resistance , and design .

The present invention was made in consideration of the above circumstances, and aims to provide a decorative panel that can demonstrate high performance as a shutter material.

In order to solve the above problems, one aspect of the present invention is a decorative plate comprising a metal plate, a pattern-printed layer, and a topcoat layer. The pattern-printed layer is laminated on one side of the metal plate and is formed by printing a pattern. The topcoat layer forms the outermost layer on one side of the metal plate and contains wax.

According to one aspect of the present invention, it is possible to provide a decorative panel that can exhibit high performance as a shutter material.

1 is a cross-sectional view showing a configuration of a decorative board according to a first embodiment of the present invention.

The following describes the embodiments of the present technology with reference to the drawings. In the description of the drawings, the same or similar parts are denoted by the same or similar reference numerals, and duplicate descriptions are omitted. Each drawing is schematic and may differ from the actual one. The following embodiments are examples of devices and methods for embodying the technical ideas of the present technology, and the technical ideas of the present technology are not limited to the devices and methods exemplified in the following embodiments. The technical ideas of the present technology can be modified in various ways within the technical scope described in the claims. In addition, the directions of "left and right" and "up and down" in the following description are simply defined for the convenience of explanation and do not limit the technical ideas of the present invention. Therefore, for example, if the paper is rotated 90 degrees, "left and right" and "up and down" are read interchangeably, and of course, if the paper is rotated 180 degrees, "left" becomes "right" and "right" becomes "left".

First Embodiment
The configuration of the decorative board 10 will be described below with reference to FIG.
As shown in Figure 1, the decorative board 10 comprises a metal plate 1, a first chemical conversion treatment layer 2, a second chemical conversion treatment layer 3, a back surface coating layer 4, a primer layer 5, a base coat layer 6, a picture print layer 7, a matte print layer 8, and a top coat layer 9.

<Metal plate>
The metal plate 1 is the base plate of the decorative plate 10, and is formed using any one of a non-alloyed hot-dip galvanized steel plate, an alloyed hot-dip galvanized steel plate, a Galvalume steel plate (registered trademark), a stainless steel plate, or an aluminum plate.
In the first embodiment, as an example, a case will be described in which the metal plate 1 is formed using a non-alloyed hot-dip galvanized steel plate. The non-alloyed hot-dip galvanized steel plate is a steel plate having a zinc plating (metal coating) formed on the surface thereof, but not subjected to an alloying treatment for improving adhesion to paint and corrosion resistance.
The thickness of the metal plate 1 is, for example, 0.4 mm or more.

<First chemical conversion coating layer>
The first chemical conversion coating layer 2 is a chemical conversion coating laminated on one surface (the upper surface in FIG. 1) of the metal sheet 1 in order to improve corrosion resistance.
The first chemical conversion coating layer 2 is formed, for example, using a chromate coating or a chromate-free coating. In particular, from the standpoint of environmental load, it is preferable to form the first chemical conversion coating layer 2 using a chromate-free coating.

The chromate-free coating can be formed by a chromate-free treatment (non-chromate treatment).
The treatment liquid used in the chromate-free treatment may be, for example, a treatment liquid that does not contain hexavalent chromium, a treatment liquid that contains a silane coupling agent, etc. The treatment liquid that does not contain hexavalent chromium may be, for example, a treatment liquid that contains a salt of zirconium (Zr) alone, a treatment liquid that contains a salt of titanium (Ti) alone, or a treatment liquid that contains salts of zirconium (Zr) and titanium (Ti).

By using a chromate-free treatment with a treatment solution used for the chromate-free treatment, it is possible to make the hot-dip galvanized layer contain titanium Ti, zirconium Zr, phosphorus P, cerium Ce, silicon Si, aluminum Al, lithium Li, etc. as main components. In addition, it is possible to form a chromate-free coating that does not contain chromium. That is, the chromate-free coating includes, for example, a coating formed by each of titanium Ti, zirconium Zr, phosphorus P, cerium Ce, silicon Si, aluminum Al, and lithium Li alone. In addition, the chromate-free coating includes, for example, a coating formed by any combination of titanium Ti, zirconium Zr, phosphorus P, cerium Ce, silicon Si, aluminum Al, and lithium Li.

<Second chemical conversion coating layer>
The second chemical conversion coating layer 3, like the first chemical conversion coating layer 2, is a chemical conversion coating laminated on the other surface (the lower surface in FIG. 1) of the metal sheet 1 in order to improve corrosion resistance.
Similarly to the first chemical conversion coating layer 2, the second chemical conversion coating layer 3 is formed using, for example, a chromate coating or a chromate-free coating. In particular, from the standpoint of environmental load, it is preferable to form the second chemical conversion coating layer 3 using a chromate-free coating.

<Backside Coating Layer>
The back surface coating layer 4 is laminated on the surface (the lower surface in FIG. 1 ) opposite to the surface of the second chemical conversion treatment layer 3 facing the metal plate 1. That is, the back surface coating layer 4 is laminated on the other surface of the metal plate 1, and is a layer for covering the back surface of the metal plate 2.
The back surface coating layer 4 is formed using, for example, an epoxy resin or a polyester resin.

In the first embodiment, as an example, a case will be described in which the additive rate of the epoxy resin is about 49% and the additive rate of the inorganic additive is about 51%.
Furthermore, the back surface coating layer 4 contains an anti-rust agent to improve corrosion resistance.

<Primer layer>
The primer layer 5 is a base layer for improving the adhesion and corrosion resistance between the first chemical conversion coating layer 2 and the base coat layer 6 .
Furthermore, the primer layer 5 is laminated on the surface of the first chemical conversion coating layer 2 opposite to the surface facing the metal sheet 1 (the upper surface in FIG. 1).

Furthermore, the primer layer 5 is formed using, for example, a polyester resin, an organic additive, a pigment, and the like.
In the first embodiment, as an example, a case will be described in which the addition rate of polyester resin is approximately 57%, the addition rate of organic additive is approximately 1%, and the addition rate of pigment is approximately 42%.
The primer layer 5 may contain an anti-rust pigment for the purpose of improving corrosion resistance.
The thickness of the primer layer 5 is, for example, in the range of 1 μm to 10 μm.

<Base coat layer>
The base coat layer 6 is a layer for imparting the base color of the picture-printed layer 7 to the decorative board 10, and is laminated on the surface of the primer layer 5 opposite the surface facing the first chemical conversion coating layer 2 (the upper surface in FIG. 1 ). In other words, the base coat layer 6 is a layer disposed between the metal plate 1 and the picture-printed layer 7.

The base coat layer 6 is formed using, for example, a polyester resin, a melamine resin, a pigment, or the like.
In the first embodiment, as an example, a case will be described in which the additive rate of polyester-based resin is approximately 45%, the additive rate of melamine-based resin is approximately 15%, and the additive rate of pigment is approximately 40%.

Furthermore, the base coat layer 6 contains weather resistance agents such as an ultraviolet absorbing agent and a light stabilizer.
In addition, at least one of an epoxy resin, an acrylic resin, and a rust inhibitor is added to the base coat layer 6 in order to improve corrosion resistance.
The thickness of the base coat layer 6 is, for example, in the range of 10 μm to 30 μm.

<Pattern printing layer>
The pattern printed layer 7 is a layer on which a pattern is printed, and is a layer for imparting design features to the decorative board 10 through the pattern.
The printing ink or paint used for printing the picture print layer 7 is applied by various printing methods such as gravure printing, offset printing, and inkjet printing, or various coating methods such as gravure coating and roll coating.

The pattern-printed layer 7 is laminated on the surface of the base coat layer 6 opposite the surface facing the primer layer 5 (the upper surface in FIG. 1). In other words, the pattern-printed layer 7 is laminated on one surface of the metal plate 1.

Further, the pattern print layer 7 contains an ultraviolet absorbing agent, a light stabilizer, and the like as weather resistance agents.
The paint for forming the picture print layer 7 is a printing ink or paint formed by dissolving or dispersing a colorant such as a dye or pigment together with a suitable binder resin in a suitable dilution solvent. Any known binder resin may be used as the binder resin, but it is preferable to use a thermosetting resin such as a polyester resin, a urethane resin, an epoxy resin, a melamine resin, an alkyd resin, a phenol resin, or an acrylic resin.

In the first embodiment, as an example, a case will be described in which the addition rate of polyester resin is approximately 49%, the addition rate of organic additive is approximately 1%, and the addition rate of pigment is approximately 50%.
As the pigment, it is possible to use known pigments, such as titanium oxide, zinc oxide, carbon black, iron oxide, organic pigments, metallic pigments, pearl pigments, etc. Among the known pigments, iron-composite oxides are used as heat-shielding pigments.

The pattern formed by the pattern printing layer 7 is not particularly limited, but may be, for example, a wood grain pattern, a stone pattern, a cloth pattern, an abstract pattern, a geometric pattern, letters, symbols, a solid color, or the like, used alone. Also, the pattern formed by the pattern printing layer 7 may be, for example, a combination of two or more types of wood grain pattern, stone pattern, cloth pattern, an abstract pattern, a geometric pattern, letters, symbols, a solid color, or the like.

In the first embodiment, as an example, a case will be described in which the picture pattern formed by the picture print layer 7 is a wood grain pattern.
The thickness of the picture print layer 7 is, for example, within the range of 0.1 μm to 1.0 μm.

<Matte printing layer>
The matte printed layer 8 is laminated on the surface of the picture printed layer 7 opposite to the surface facing the base coat layer 6 (the upper surface in FIG. 1 ). In other words, the matte printed layer 8 is laminated on the surface of the picture printed layer 7 opposite to the surface facing the metal plate 1.
The matte print layer 8 is a layer in which a concave-convex shape is formed by printing (matte printing) using fine aggregate (matte).

The mat may be made of, for example, acrylic beads, glass beads, urea resin, etc. The reason for using acrylic beads, glass beads, urea resin, etc. as the mat is that they can withstand the pressure of the embossing process described below.
Examples of the uneven shapes include the duct grooves of a wood grain board, the uneven surface of a stone slab (such as the cleavage surface of granite), the texture of a cloth surface, matte finish, sand grain, hairline, and linear grooves.

The matte print layer 8 of the first embodiment is formed with a concave-convex shape to form the vessel portion. The convex portions forming the vessel pattern are preferably arranged in harmony with the pattern of the picture print layer 7. Here, "in harmony" means that the pattern and the vessels overlap to a range of 50% or more when viewed from the front side.
The printing plate used to print the matte printing layer 8 has a high plate depth (within the range of 50 μm to 120 μm), for example.

Moreover, the height of the convex portions formed in the matte print layer 8 is preferably set within a range of, for example, 5 μm to 30 μm.
Furthermore, the height of the convex portions formed in the matte printing layer 8 is set to be within a range of 100% or more and less than 200% of the thickness of the topcoat layer 9. The height of the convex portions formed in the matte printing layer 8 is set, for example, by setting the grain size of the matte to be within a range of 100% or more and less than 200% of the thickness of the topcoat layer 9. Thus, a part of the matte printing layer 8 protrudes from the topcoat layer 9.

The matte print layer 8 may become whitish if a matte agent such as silica is added. For this reason, it is preferable to mix a coloring pigment such as ink or black carbon into the matte print layer 8. Adding ink gives the layer a dark brownish color, making it possible to express a more realistic wood grain.

<Topcoat layer>
The top coat layer 9 is a transparent layer for imparting weather resistance, bending workability, scratch resistance, and cleanability to the decorative board 10, and is laminated on the surface of the matte printed layer 8 opposite the surface facing the picture printed layer 7 (the upper surface in FIG. 1 ). In other words, the top coat layer 9 is a layer that forms the outermost layer on one side of the metal sheet 1 in the decorative board 10.

The top coat layer 9 is formed using, for example, a polyester resin, an acrylic resin, a fluorine resin, an organic additive, an inorganic additive, etc. That is, the top coat layer 9 contains a polyester resin.
In the first embodiment, as an example, a case will be described in which the additive rate of polyester resin is approximately 84%, the additive rate of organic additive is approximately 7%, and the additive rate of inorganic additive is approximately 9%.

Furthermore, the topcoat layer 9 contains wax and resin beads.
The wax may be, for example, polytetrafluoroethylene (PTFE). Alternatively, the wax may be, for example, PTFE to which polyethylene (PE) has been added.
The wax content relative to the resin solid content of the topcoat layer 9 is, for example, within a range of 3% to 5%.

The resin beads are, for example, acrylic beads having an average particle size of 10 μm.
The ratio of the resin beads to the resin solid content of the topcoat layer 9 is, for example, within a range of 5% to 7.5%.
In addition, the topcoat layer 9 contains an ultraviolet absorbing agent, a light stabilizer, and the like as weather resistance agents.

The thickness of the topcoat layer 9 is, for example, in the range of 5 μm to 15 μm.
Furthermore, in order to improve the design, silica is added to the top coat layer 9 as an aggregate.
In order to improve weather resistance, a weather resistance agent such as an ultraviolet absorber may be added to the top coat layer 9. Furthermore, in order to adjust the gloss, a matting agent may be added to the top coat layer 9. Furthermore, in order to adjust the gloss, an additive for imparting deodorizing properties, aromatic properties, etc., or an additive for imparting antibacterial properties may be added to the top coat layer 9.

The above-mentioned first embodiment is an example of the present invention, and the present invention is not limited to the above-mentioned first embodiment. Various modifications can be made to the design, etc., even if the modifications are in a form other than this embodiment, as long as they do not deviate from the technical concept of the present invention.

(Effects of the First Embodiment)
The decorative board 10 of the first embodiment can achieve the effects described below.
(1) The metal plate 1 is laminated on one side thereof and includes a pattern printed layer 7 formed by printing a pattern, and a top coat layer 9 forming the outermost layer on the one side of the metal plate 1, and wax is added to the top coat layer 9.
As a result, it is possible to provide a decorative panel 10 that can exhibit high performance as a shutter material, such as sliding properties and blocking resistance, compared to a configuration in which wax is not added to the top coat layer 9.

In addition, shutter materials in which a wood-grain printed sheet is laminated to a base material require two processes, a process for manufacturing the sheet and a process for laminating, which increases the manufacturing cost. In addition, wooden shutter materials and sheet-wrapped shutter materials have a problem of low fire resistance due to their high organic mass.

Shutter materials that are highly weather resistant and fireproof include painted steel sheets and painted aluminum, which are painted directly onto the base material. However, painted steel sheets and painted aluminum, which are painted directly onto the base material, are generally made in a single color. For this reason, it is difficult to create shutter materials with high design quality like wooden shutters.

In response to these problems, the decorative panel 10 of the first embodiment is able to have a high level of design because it is printed directly onto the metal plate 1 without lamination or other processes. In addition, it is possible to produce a fire-resistant decorative steel plate at low manufacturing costs while also demonstrating high performance as a shutter material.

(2) The additive rate of the wax to the resin solid content of the top coat layer 9 is within the range of 3% or more and 5% or less. As a result, it is possible to exhibit high scratch resistance and to suppress deterioration of the design.

(3) The top coat layer 9 contains resin beads.
As a result, compared to a configuration in which resin beads are not added to the top coat layer 9, it is possible to exhibit high performance as a shutter material, such as sliding properties and blocking resistance.

(4) The resin beads added to the topcoat layer 9 are acrylic beads having an average particle size of 10 μm.
As a result, compared to a configuration in which nylon beads or glass beads are added to the top coat layer 9, it is possible to exhibit high performance as a shutter material, such as sliding properties, scratch resistance, and blocking resistance.

(5) The additive ratio of the resin beads to the resin solid content of the top coat layer 9 is within the range of 5% or more and 7.5% or less. As a result, it is possible to exhibit high performance as a shutter material, such as sliding properties, scratch resistance, and blocking resistance, compared to configurations in which the additive ratio of the resin beads to the resin solid content of the top coat layer 9 is less than 5% or more than 7.5%.

(6) The top coat layer 9 contains a polyester resin.
As a result, compared to a configuration in which an acrylic resin is added to the top coat layer 9, it is possible to improve processability and fire resistance.

(7) The base coat layer 6 contains a polyester resin.
As a result, it is possible to improve processability as compared with a configuration in which an acrylic resin is added to the top coat layer 9 .

(8) The topcoat layer 9 contains at least an ultraviolet absorbing agent among an ultraviolet absorbing agent and a light stabilizer.
As a result, the weather resistance of the decorative board 10 can be improved.

(9) The top coat layer 9 contains a matting agent.
As a result, it becomes easy to adjust the gloss of the top coat layer 9.

(10) The base coat layer 6 contains at least one of an epoxy resin, an acrylic resin, and a rust inhibitor.
As a result, the corrosion resistance of the decorative board 10 can be improved.

(11) The base coat layer 6 contains at least an ultraviolet absorber among an ultraviolet absorber and a light stabilizer.
As a result, the weather resistance of the decorative board 10 can be improved.

(12) The picture print layer 7 contains at least an ultraviolet absorbing agent among an ultraviolet absorbing agent and a light stabilizer.
As a result, the weather resistance of the decorative board 10 can be improved.

(13) The back surface coating layer 4 contains an anti-rust agent.
As a result, the corrosion resistance of the decorative board 10 can be improved.

(Modification)
(1) In the first embodiment, the decorative board 10 is configured as a laminate in which the back surface coating layer 4, the second chemical conversion treatment layer 3, the metal plate 1, the first chemical conversion treatment layer 2, the primer layer 5, the base coat layer 6, the picture print layer 7, the matte print layer 8, and the top coat layer 9 are laminated, but this is not limited thereto. That is, the decorative board 10 may be configured as a laminate in which the back surface coating layer 4, the second chemical conversion treatment layer 3, the metal plate 1, the first chemical conversion treatment layer 2, the primer layer 5, the base coat layer 6, the picture print layer 7, and the top coat layer 9 are laminated.

With reference to the first embodiment, the decorative panels of Examples 1 to 4 and the decorative panels of Comparative Examples 1 to 11 will be described below.

Example 1
As the metal plate, a hot-dip galvanized steel plate (SGC440 steel plate) having a thickness of 0.4 mm and conforming to JIS-G3302 was used.
The first chemical conversion coating layer and the second chemical conversion coating layer were formed by carrying out a chemical conversion treatment on both sides of the metal sheet using a zirconic hydrofluoric acid-based chemical conversion coating agent.

After forming the first chemical conversion coating layer and the second chemical conversion coating layer, a backside coating layer was formed and a primer was applied to form a primer layer. The applied primer was dried by baking at a temperature of 200°C or higher. The applied primer contained a polyester resin (about 57%), an organic additive (about 1%) and a pigment (about 42%). The dry application amount of the primer was 9.5 g/ ^m2 .

After forming the back coat layer and the primer layer, a polyester-based base coat containing various additives was applied to the primer layer to form a base coat layer with a thickness of about 13 μm. The base coat layer was dried by baking at a temperature of 200°C or higher.

After the base coat layer was formed, a pattern printed layer having a thickness of about several μm and a pattern printed in two colors was formed by gravure offset printing.
No matte print layer was formed.

After forming the pattern print layer, a polyester-based top coat was applied to a thickness of about 8 μm to 9 μm to form a top coat layer. The top coat layer was dried by baking at a temperature of 200° C. or higher. Wax (PTFE) was added to the polyester-based top coat at a ratio of 4% to the resin solid content of the polyester-based top coat. In addition, acrylic beads with an average particle size of 10 μm were added to the polyester-based top coat at a ratio of 5% to the resin solid content of the polyester-based top coat.
In this manner, the decorative board of Example 1 was produced.

Example 2
The decorative panel of Example 2 was manufactured in the same manner as in Example 1, except that acrylic beads having an average particle size of 10 μm were added to the polyester-based top coat at an addition rate of 7.5% relative to the resin solids content of the polyester-based top coat.

Example 3
The decorative board of Example 3 was manufactured in the same manner as in Example 1, except that wax was added to the polyester-based top coat at an addition rate of 3% based on the resin solids of the polyester-based top coat.

Example 4
The decorative board of Example 4 was manufactured in the same manner as in Example 1, except that wax was added to the polyester-based top coat at an addition rate of 5% based on the resin solids of the polyester-based top coat.

(Comparative Example 1)
The decorative panel of Comparative Example 1 was manufactured in the same manner as in Example 1, except that nylon beads having an average particle size of 10 μm were added to the polyester-based top coat at an addition rate of 2.5% relative to the resin solids content of the polyester-based top coat.

(Comparative Example 2)
The decorative panel of Comparative Example 2 was manufactured in the same manner as Comparative Example 1, except that nylon beads having an average particle size of 10 μm were added to the polyester-based top coat at an addition rate of 5% relative to the resin solids content of the polyester-based top coat.

(Comparative Example 3)
The decorative panel of Comparative Example 3 was manufactured in the same manner as Comparative Example 1, except that nylon beads having an average particle size of 10 μm were added to the polyester-based top coat at an addition rate of 7.5% relative to the resin solids content of the polyester-based top coat.

(Comparative Example 4)
The decorative panel of Comparative Example 4 was manufactured in the same manner as Comparative Example 1, except that nylon beads having an average particle size of 10 μm were added to the polyester-based top coat at an addition rate of 10% relative to the resin solids content of the polyester-based top coat.

(Comparative Example 5)
The decorative panel of Comparative Example 5 was manufactured in the same manner as in Example 1, except that acrylic beads having an average particle size of 10 μm were added to the polyester-based top coat at an addition rate of 2.5% relative to the resin solids content of the polyester-based top coat.

(Comparative Example 6)
The decorative panel of Comparative Example 6 was manufactured in the same manner as in Example 1, except that acrylic beads having an average particle size of 10 μm were added to the polyester-based top coat at an addition rate of 10% relative to the resin solids content of the polyester-based top coat.

(Comparative Example 7)
The decorative panel of Comparative Example 7 was manufactured in the same manner as in Example 1, except that glass beads having an average particle size of 10 μm were added to the polyester-based top coat at an addition rate of 2.5% relative to the resin solids content of the polyester-based top coat.

(Comparative Example 8)
A decorative board of Comparative Example 8 was produced in the same manner as in Example 1, except that the base coat layer was formed using an acrylic base coat.

(Comparative Example 9)
A decorative board of Comparative Example 9 was produced in the same manner as in Example 1, except that the topcoat layer was formed using an acrylic topcoat.

(Comparative Example 10)
The decorative panel of Comparative Example 10 was manufactured in the same manner as in Example 1, except that wax was added to the polyester-based top coat at an addition rate of 2% based on the resin solids of the polyester-based top coat.

(Comparative Example 11)
The decorative board of Comparative Example 11 was manufactured in the same manner as in Example 1, except that wax was added to the polyester-based top coat at an addition rate of 6% based on the resin solids of the polyester-based top coat.

(Performance evaluation, evaluation results)
The decorative boards of Examples 1 to 4 and Comparative Examples 1 to 11 were evaluated for sliding properties, scratch resistance, processability, blocking resistance, and fire resistance. The evaluation methods used were as follows.

<Sliding properties>
A sliding test was conducted in which the topcoat layer was rubbed 10,000 times in succession with a load of 1 kg applied to the decorative board, and the sliding property was evaluated. A state in which the base material was not exposed was evaluated as "○", and a state in which the base material was exposed was evaluated as "×".

<Scratch resistance>
A pencil hardness test was performed on the decorative board in which a pencil with a hardness of "H" or more was pressed against the topcoat layer to evaluate scratch resistance. A state in which no scratches were formed on the topcoat layer was evaluated as "○", and a state in which scratches were formed on the topcoat layer was evaluated as "×".

<Processability>
The decorative board was bent at 180° to evaluate the workability. The state in which no cracks occurred in the topcoat layer was evaluated as "○", and the state in which cracks occurred in the topcoat layer was evaluated as "×".

<Blocking resistance>
The decorative panels were subjected to a blocking resistance test under conditions of a temperature of 60° C., a load of 10 kg/cm ² , and a test time of 24 hours to evaluate the blocking resistance. A state in which no blocking occurred was evaluated as “◯”, and a state in which blocking occurred was evaluated as “×”.

<Fire resistance>
The decorative boards were evaluated for fire resistance using a test method (in accordance with ISO 5660-1) using a cone calorimeter. The decorative boards were rated as "○" when they were not in flames, and as "×" when they were in flames.

As a result of evaluating various performances using the above-mentioned method, the decorative boards of Examples 1 to 4 showed excellent performance in all evaluation tests, but the decorative boards of Comparative Examples 1 to 10 showed inferior performance as a shutter material compared to the decorative boards of Examples 1 to 4 in all evaluation tests. In addition, the decorative board of Comparative Example 11 showed good performance as a shutter material, but had cloudy areas formed on the surface, and it was confirmed that the design was inferior to the decorative boards of Examples 1 to 4.

1...metal plate, 2...first chemical conversion coating layer, 3...second chemical conversion coating layer, 4...backside coating layer, 5...primer layer, 6...base coating layer, 7...picture printing layer, 8...matte printing layer, 9...top coating layer, 10...decorative plate

Claims (6)

A metal plate;
a pattern printed layer formed by printing a pattern on one surface of the metal plate;
a topcoat layer forming the outermost layer on said one side;
A base coat layer is disposed between the metal plate and the picture print layer,
the topcoat layer is formed using a polyester resin, and resin beads, wax, and at least an ultraviolet absorbing agent among an ultraviolet absorbing agent and a light stabilizer are added thereto;
The resin beads are acrylic beads having an average particle size of 10 μm,
The wax content of the top coat layer is in the range of 3% to 5% of the resin solid content,
The addition rate of the resin beads to the resin solid content of the top coat layer is within a range of 5% to 7.5%;
The base coat layer is a decorative board formed using a polyester-based resin. 2. The decorative board according to claim 1 , wherein the top coat layer contains a matting agent. 3. The decorative board according to claim 1, wherein the base coat layer contains at least one of an epoxy resin, an acrylic resin, and a rust inhibitor . 4. The decorative board according to claim 1 , wherein the base coat layer contains at least an ultraviolet absorbing agent selected from the group consisting of an ultraviolet absorbing agent and a light stabilizer. 5. The decorative board according to claim 1, wherein the pattern printed layer contains at least an ultraviolet absorbing agent among an ultraviolet absorbing agent and a light stabilizer. Further comprising a back coat layer laminated on the other surface of the metal plate,
6. The decorative board according to claim 1, wherein the back coating layer contains an anti-rust agent.

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