JP4170407B2 - Inorganic decorative board having antibacterial properties and method for producing the same - Google Patents

Description

上記結果から判るように、試験例２〜７はいずれも表面状態、抗菌性能に良好な結果が得られた。これに対し試験例８は表面状態は良好であるが抗菌性能がやや不良である。試験例９は表面状態、抗菌性能共にやや不良である。
【００２４】
【発明の効果】
本発明は以上説明したように、無機質系基材の表面に無機系抗菌剤を添加した電離放射線硬化性樹脂によりトップコート層が形成されているため、化粧板表面に抗菌性が付与され、カビや細菌の発生を抑えることができ、耐汚染性、耐擦傷性にも優れた抗菌性を有する無機質系化粧板を得ることが出来る。
【００２５】
また、印刷紙を用いることなく無機質系基材の表面に設けられたベースコート層面に、転写によって直接絵柄印刷層が設けられているため、流し台、浴室等の水回りに用いても密着性の低下もなく、ガスコンロ回りに用いても耐熱性、耐防火性の問題もない化粧板とすることができ、キッチンバックパネルとして用いることが出来る。
【図面の簡単な説明】
【図１】本発明の無機質系化粧板の実施例を示す断面図である。
【図２】本発明の無機質系化粧板の製造方法の一例を説明する積層断面図である。
【符号の説明】
１ 無機質系化粧板
２ 無機質系基材
３ ベースコート層
３ａ シーラー層
３ｂ プライマー層
４ 絵柄印刷層
４ａ ベタインキ層
４ｂ 絵柄インキ層
５ トップコート層
６ 転写シート
７ 転写シート基材
Ｒ 電離放射線[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an interior decorative board, particularly an inorganic decorative board having excellent antibacterial properties and water resistance, which is used for wall surfaces and ceiling surfaces of kitchens, bathrooms and the like, and a method for producing the same.
[0002]
[Prior art]
Conventionally, as an inorganic decorative board, for example, a method of sticking decorative paper on which a pattern is formed on an inorganic base material such as calcium silicate board, asbestos slate board, cement slate board, etc. After providing a pattern layer by a method of printing a pattern or a method of transferring a pattern to an inorganic base material using a transfer sheet, a thermosetting resin as a top coat layer from the pattern layer Inorganic decorative boards coated with transparent paints such as ionizing radiation curable resins are known, but such inorganic decorative boards are not antibacterial and are used for applications requiring antibacterial properties. Was not suitable.
[0003]
However, inorganic decorative panels have excellent properties such as water resistance, fire resistance, and contamination resistance, so they are often used around kitchens such as sinks and gas stoves, and on the walls and ceilings of bathrooms, washrooms, dressing rooms, etc. It is used. However, these applications are often used under conditions that are suitable for the growth of mold and bacteria due to warm and humid, adhesion of nutrients, and contamination. The grant of was desired.
[0004]
However, when making an inorganic decorative board by adding an antibacterial agent to an ionizing radiation curable resin paint, discoloration or deterioration of physical properties has occurred. In particular, makeup using an ionizing radiation curable resin paint to which an organic antibacterial agent has been added. The board has a problem that the stability such as heat resistance is low, and the surface appearance of the decorative board is likely to be damaged due to the discoloration caused by ultraviolet rays irradiated at the time of curing.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of such problems, and the object thereof is excellent in water resistance and fire resistance and antibacterial used for wall surfaces and ceiling surfaces of kitchens, bathrooms, washrooms, dressing rooms, etc. It is providing the manufacturing method of the inorganic type decorative board which has the antibacterial property which can manufacture the inorganic type decorative board which has the antimicrobial property easily while providing the inorganic type decorative plate which has the property.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the solution of the present invention is an inorganic decorative board in which a base coat layer, a pattern printing layer, and a top coat layer are sequentially laminated on the top surface of an inorganic base material, wherein the top coat layer is inorganic. It is an inorganic decorative board having antibacterial properties, characterized by being formed of an ionizing radiation curable resin to which an antibacterial agent is added.
By adopting this configuration, antibacterial performance is imparted to the surface of the topcoat layer, and generation of mold and bacteria can be suppressed. In addition, a fine pattern printing layer can be formed on the surface of an inorganic base material without using decorative paper, and it is used around a gas stove without any decrease in adhesion even when used around water in a sink, bathroom, etc. Can also be used as a decorative board without worrying about heat resistance and fire resistance.
[0007]
A transfer sheet having a configuration in which the pattern print layer includes a pattern print layer formed on one side of the transfer sheet substrate is mounted so that the surface having the pattern print layer and the base coat layer surface of the inorganic base material are in contact with each other. It is formed by peeling the transfer substrate sheet of the transfer sheet after placing and thermocompression bonding. By doing so, a fine pattern printing layer can be easily formed on the surface of the inorganic base material without using decorative paper.
[0008]
The inorganic antibacterial agent comprises silver-based inorganic antibacterial agent fine particles having an average particle size in the range of 0.05 to 0.5 μm, and is 0.5 to 5.0 with respect to the solid content of the ionizing radiation curable resin paint. It is characterized by containing wt%.
By doing this, the dispersibility of the silver-based inorganic antibacterial agent in the ionizing radiation curable resin paint is excellent, and the silver-based inorganic antibacterial agent does not settle after coating. Remarkable antibacterial performance can be imparted to the surface of the decorative board, and a decorative board excellent in design can be obtained without changing the glossiness of the topcoat layer.
[0009]
A step of preparing a transfer sheet in which a pattern printing layer is laminated on one surface of the transfer sheet substrate; a step of coating a base coat layer on the upper surface of the inorganic substrate; and the pattern printing layer of the transfer sheet as the inorganic substrate. A step of placing the substrate in contact with the base coat layer and heat-pressing the material; a step of forming a pattern printing layer on the top surface of the inorganic base material by peeling the transfer sheet substrate of the transfer sheet; and a surface of the pattern printing layer Coating of an ionizing radiation curable resin to which an inorganic antibacterial agent is added, and forming a top coat layer by irradiation curing with ionizing radiation, to produce an inorganic decorative board having antibacterial properties By adopting the method, an inorganic decorative board having the above effects can be easily and reliably manufactured.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a laminated sectional view showing an embodiment of the inorganic decorative board of the present invention, FIG. 2 is a laminated sectional view for explaining an example of the method for producing the inorganic decorative board of the present invention, 1 is an inorganic decorative board, 2 is an inorganic base material, 3 is a base coat layer, 3a is a sealer layer, 3b is a primer layer, 4 is a pattern printing layer, 4a is a solid ink layer, 4b is a pattern ink layer, 5 is a top coat layer, 6 is a transfer sheet, 7 represents a transfer sheet substrate, and R represents ionizing radiation.
[0011]
As shown in FIG. 1, the structure of the inorganic decorative board 1 of the present invention is an ionizing radiation curable resin in which a picture printing layer 4 and an antibacterial agent are mixed via a base coat layer 3 provided on the surface of an inorganic base material 2. The top coat layer 5 formed by the above structure is laminated. The pattern printing layer 4 is composed of a solid ink layer 4a and a pattern ink layer 4b, and is formed on the surface of the base coat layer 3 including the sealer layer 3a and the primer layer 3b provided on the upper surface of the inorganic base material 2 by a transfer method. Consists of composition.
[0012]
Next, an example of a method for producing the inorganic decorative board 1 of the present invention will be described with reference to the drawings. First, as shown in FIG. 2 (a), a pattern comprising a pattern ink layer 4b and a solid ink layer 4a on the surface of the polyolefin resin layer 7b of a transfer sheet substrate 7 provided with a polyolefin resin layer 7b on the surface of a thin paper 7a. A transfer sheet 6 provided with the printing layer 4 is prepared. Next, a base coat layer 3 composed of a sealer layer 3a and a primer layer 3b was provided on the top surface of the inorganic base material 2 as shown in FIG. Next, as shown in FIG. 2 (c), the pattern printing layer 4 of the transfer sheet 6 is overlaid so as to face the base coat layer 3 provided on the surface of the inorganic base material 2, and the transfer sheet base material 7 is heated and pressurized from the surface 7. Next, as shown in FIG. 2 (d), the transfer sheet base material 7 of the transfer sheet 6 is peeled off, and the pattern printing layer 4 is provided on the surface of the base coat layer 3 of the inorganic base material 2. Next, as shown in FIG. 2 (e), an ionizing radiation curable resin 5 added with an inorganic antibacterial agent is applied to the upper surface of the inorganic base material 2 including the pattern printing layer 4, and the ionizing radiation R is irradiated. By curing and curing, an inorganic decorative board 1 having antibacterial properties as shown in FIG. 1 is obtained.
[0013]
The inorganic base material 2 used for the inorganic decorative board 1 of the present invention is generally a cement board such as calcium silicate board, asbestos slate board, lightweight foamed concrete board, hollow extruded cement board, gypsum board, gypsum slag. Examples include a plaster board such as a board, a fiber cement board such as a pulp cement board, an asbestos cement board, a wood chip cement board, etc. The surface shape of the inorganic base material 2 may be a smooth surface or a gentle uneven surface. Examples of the method for providing the uneven shape include a method of forming an uneven shape on the surface of the inorganic base material with a roll press, a flat plate press or the like before the inorganic base material is cured.
[0014]
The base coat layer 3 has a high design feeling for preventing the elution of alkali components from the inorganic base material 2 and by improving the adhesion between the inorganic base material 2 and the pattern printing layer 4 and the transferability of the pattern printing layer 4. It is provided for the purpose of appearance, and its configuration is arbitrary, and it is of course possible to adopt a single layer configuration with a resin composition having both of the above physical properties. In order to prevent this, the sealer layer 3a made of a curable resin such as a polyisocyanate resin, a moisture curable urethane resin, a styrene-acrylate copolymer resin, and the pattern printing layer 4 on the surface of the inorganic substrate 2 It is desirable to have a two-layer structure composed of a primer layer 3b made of an acrylic urethane-based resin, a methacrylic ester-based resin coating or the like for the purpose of improving adhesion and transferability. It is. Furthermore, the primer layer 3b is colored and opaque so that it has a concealing property so that the pattern printing layer 4 formed on the substrate is not affected by the color of the substrate to be bonded. .
[0015]
As shown in FIG. 2 (a), the structure of the transfer sheet 6 for forming the picture printed layer 4 on the inorganic decorative board 1 is a polyolefin resin layer as a release layer on one side of the thin paper 7b. An arbitrary picture printing layer 4 is laminated on the surface of the polyolefin-based resin layer 7a of the transfer sheet substrate 7 on which the surface 7a is formed. As the transfer sheet base material 7, a plastic film such as a polyethylene film, a polypropylene film, a polyester film, a thin paper, a paper such as a pure white paper, or a composite film such as those used as a normal transfer sheet base material is used. What laminated | stacked polyolefin resin layer 7a, such as polyethylene and a polypropylene, on the upper surface of the thin paper 7b is used preferably. In order to improve the thermal conductivity at the time of transfer, the transfer sheet base material 7 is preferably as thin as possible. However, if the thickness is too thin, the base material tends to be stretched at the time of printing such as gravure printing and printability is lowered. It is desirable to back the thin paper 7b or the like from the aspect of printability, and the thin paper 7b coated with a polyolefin resin of 10 to 30 μm is optimal. Further, by using a polyolefin-based resin such as polyethylene or polypropylene, it is possible to make the transfer easy by making use of the thermal flexibility of the uneven shape on the surface of the inorganic base material 2.
[0016]
The pattern printing layer 4 is provided with a solid ink layer 4a for printing on the whole surface and a pattern ink layer 4b for expressing, for example, stones, fabrics, surface patterns of natural leather, abstract patterns, etc. As the ink vehicle, general-purpose resins such as alkyd resins, urethane resins, vinyl chloride resins, etc. are used, and other additives such as organic or inorganic pigments, dyes, etc., if necessary. A colorant, an extender pigment, a stabilizer, a plasticizer, a solvent and the like appropriately mixed can be used.
[0017]
As the top coat layer 5, it is desirable to form a film having excellent surface properties such as contamination resistance, scratch resistance, and solvent resistance. As the resin for forming the top coat layer 5, an ionizing radiation curable resin is used. Suitable ionizing radiation curable resins include monomers and / or prepolymers that contain polymerizable unsaturated groups such as (meth) acryloyl groups, (meth) acryloyloxy groups, epoxy groups, thiol groups, etc. in the molecule. The resulting composition is cured by polymerization (crosslinking reaction, addition reaction, etc.) with ionizing radiation, and as the ionizing radiation, an electron beam, ultraviolet light, or the like is used. Examples of these prepolymers include urethane (meth) acrylates, polyester (meth) acrylates, (meth) acrylates such as epoxy (meth) acrylates, unsaturated polyesters, etc., and examples of monomers include styrene , Styrene monomers such as α-methylstyrene, methyl (meth) acrylate, (meth) acrylic acid-2-ethylhexyl, dipentaerythritol hexa (meth) acrylate, dipentaerythritol penta (meth) acrylate, trimethylolpropane tri (Meth) acrylate and the like. As the coating method, known coating means such as curtain flow coating, roll coating, spray coating and the like can be used, and the coating thickness is preferably 50 to 100 μm.
[0018]
The inorganic antibacterial agent used in the present invention is a silver inorganic antibacterial agent in which silver ions are supported on various inorganic substances, for example, an antibacterial zeolite composition in which silver ions are supported by ion exchange, and silver oxide is added and melted. Antibacterial glass, antibacterial agent in which silver ions are supported on zirconium phosphate by ion exchange, antibacterial agent obtained by adsorbing and holding silver ions on hydroxyapatite and baking, and magnesium aluminosilicate supporting silver ions In particular, antibacterial zeolite compositions and antibacterial ceramics can be suitably used. As specific examples of this silver-based inorganic antibacterial agent, for example, commercially available products such as “Zeomic AJ10N” (manufactured by Sinanen Zeomic, silver ion-carrying zeolite), “antibacterial cera coat C01” (manufactured by Shinto V Cerax, antibacterial ceramic) Available.
[0019]
Moreover, as the silver-based inorganic antibacterial agent used, dispersion of the silver-based inorganic antibacterial agent into the ionizing radiation curable resin coating is achieved by using an ultrafine particle having an average particle size in the range of 0.05 to 0.5 μm. Since it is excellent in properties and does not settle in the coating film after coating, a remarkable antibacterial performance can be imparted to the surface of the inorganic decorative board with a small amount of addition.
And as addition amount of a silver type inorganic antibacterial agent, the range of 0.5-5.0 weight% with respect to curable resin coating solid content, Preferably 1.0-2.0 weight% is suitable, If the addition amount is less than 0.5% by weight, the antibacterial effect tends to be small, and if it exceeds 5.0% by weight, the effect is not improved and the cost is increased. Moreover, antibacterial performance can be imparted without changing the glossiness of the surface of the topcoat layer. The particle size of the silver-based inorganic antibacterial agent can be adjusted by wet pulverization in at least one kind of solvent that is familiar with the paint, such as toluene, methyl ethyl ketone, alcohol, and the like. Accordingly, it is possible to supply the top coat paint in a stable state that is excellent in dispersibility in the paint and does not settle and solidify even when left standing.
[0020]
【Example】
Example 1
A transfer sheet is produced by printing a desired pattern on a polyethylene resin layer surface of a transfer sheet base material coated with polyethylene resin to a thickness of 20 μm on a thin paper having a weight of 40 g / m ² using a gravure rotary printing press. did. Separately, 30g / m ² of moisture-curing urethane resin coating is applied as a sealer layer to a 3mm thick calcium silicate plate, and 100g / m ² of acrylic urethane resin coating is applied as a white primer layer at 80 ° C. For 20 minutes. Next, the transfer sheet was placed so that the pattern printing surface of the transfer sheet was opposed to the coating film surface, and was transferred by heating and pressing at a hot plate temperature of 135 ° C. and a pressure of 15 kg / cm ² for 5 minutes. After peeling off the transfer sheet base material of the transfer sheet, a curtain is applied to the pattern transfer surface with a transparent paint in which a urethane acrylate UV curable resin is mixed with a silver inorganic antibacterial agent so that the coating thickness becomes 50-60 μm (dry) An inorganic substance that has antibacterial properties by applying it with a flow coater and passing it through an irradiation device with two 80w / cm ozone-less UV lamps at a speed of 15m / min. A decorative veneer was prepared. At this time, as shown in Table 1, the amount of silver-based inorganic antibacterial agent added (ratio by weight% relative to the resin solid content) and the average particle size were variously changed.
[0021]
The antibacterial property test was performed on the inorganic decorative board produced in the above-described example by the following method, and the results are shown in Table 1.
[0022]
(Antimicrobial test)
On each test piece (50 × 50 mm), 0.5 ml of a bacterial solution of S. aureus and Escherichia coli was dropped and cultured for 24 hours under conditions of 35 ± 1 ° C. and a relative humidity of 90% or more. Thereafter, the surface of the phosphate buffer (10 ml) test piece was washed out, and 1 ml of the washed solution was measured for the number of surviving bacteria by a pour culture method using a standard agar medium. Converted to the number of bacteria. As a control, a test using only the bacterial solution was performed at the same time.
(Surface condition)
The surface of each test piece was visually observed.
[0023]
[Table 1]

As can be seen from the above results, in Test Examples 2 to 7, good results were obtained in the surface condition and antibacterial performance. On the other hand, Test Example 8 has a good surface condition but a slightly poor antibacterial performance. In Test Example 9, both the surface state and the antibacterial performance are slightly poor.
[0024]
【The invention's effect】
As described above, since the top coat layer is formed on the surface of the inorganic base material with the ionizing radiation curable resin to which the inorganic antibacterial agent is added, the antibacterial property is imparted to the decorative board surface, And an inorganic decorative board having antibacterial properties excellent in stain resistance and scratch resistance can be obtained.
[0025]
In addition, since the pattern print layer is provided directly on the surface of the base coat layer provided on the surface of the inorganic base material without using printing paper, the adhesiveness is reduced even when used around water in a sink, bathroom, etc. Even if it is used around a gas stove, it can be used as a decorative board free from problems of heat resistance and fire resistance, and can be used as a kitchen back panel.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of an inorganic decorative board according to the present invention.
FIG. 2 is a cross-sectional view illustrating an example of a method for producing an inorganic decorative board according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inorganic type decorative board 2 Inorganic type base material 3 Base coat layer 3a Sealer layer 3b Primer layer 4 Pattern print layer 4a Solid ink layer 4b Pattern ink layer 5 Top coat layer 6 Transfer sheet 7 Transfer sheet base material R Ionizing radiation

Claims (2)

An inorganic decorative board in which a base coat layer, a pattern printing layer, and a top coat layer are sequentially laminated on an upper surface of an inorganic base material, wherein the top coat layer has a coating thickness of 50 to 100 μm and has an inorganic antibacterial property. Formed of an ionizing radiation curable resin to which an agent is added, the inorganic antibacterial agent comprising silver-based inorganic antibacterial agent particles having an average particle range of 0.05 to 0.5 μm, and the ionizing radiation curable resin coating solid content An inorganic decorative board having antibacterial properties, characterized by containing 0.5 to 5.0% by weight based on the weight .   A transfer sheet having a configuration in which the pattern print layer includes a pattern print layer formed on one side of the transfer sheet substrate is mounted such that the surface having the pattern print layer is in contact with the base coat layer surface of the inorganic base material. 2. The inorganic decorative board having antibacterial properties according to claim 1, wherein the inorganic decorative board is formed by peeling the transfer base sheet of the transfer sheet after placing and thermocompression bonding.

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