JPH10146913A - Inorganic decorative board having antibacterial property and production method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve excellent antibacterial property, anti-abrasion property, and anti-chemical property by the use of a hardening resin paint containing an inorganic antibacterial agent as for a top coat layer. SOLUTION: An inorganic decorative board 1 comprises an inorganic substrate 2, a sealer layer 3, an adhesive layer 4, a paper decorative sheet 8 comprising a paper substrate sheet 5, a picture printing layer 6 including a solid ink layer 6a and a picture ink layer 6b, and a transparent resin layer 7, and a hardening resin paint containing an inorganic antibacterial agent, successively laminated. As the paint for forming the top coat layer 8, one containing a heat setting resin as the vehicle, an inorganic antibacterial agent and an evaporating agent, and further, other additives as needed can be used. Examples of the inorganic antibacterial agent, which is contained 0.5 to 5.0wt.% with respect to the hardening resin paint solid component, include silver inorganic antibacterial agent fine particles having a 0.05 to 0.5μm average particle size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic decorative board having excellent design and good antibacterial properties, which is used for building interior materials, in particular, walls and ceilings of kitchens, washrooms, dressing rooms and the like. It relates to the manufacturing method.

[0002]

2. Description of the Related Art Conventionally, as an inorganic decorative board, for example, a method of attaching a decorative paper having a printed pattern to an inorganic base material such as a calcium silicate board, an asbestos slate board, a cement slate board, etc. After a pattern is provided by a method of printing a pattern on a base material, or a method of transferring a pattern to an inorganic base material using a transfer sheet, a transparent paint is applied from above the pattern layer. Although a top coat layer is known, such an inorganic decorative board does not have antibacterial properties and is not suitable for applications requiring antibacterial properties.

[0003] However, inorganic decorative boards are excellent in physical properties such as fire resistance, heat resistance, stain resistance and the like.
It is often used on the walls and ceilings of washrooms, dressing rooms, etc.In these applications, it is often used under conditions suitable for propagation of mold and bacteria due to warm and humid, adhesion of nutrients, and contamination, There is a drawback that mold and bacteria easily propagate on the surface, and it has been desired to provide antibacterial properties.

However, when an inorganic decorative board is prepared by adding an antibacterial agent to a curable resin coating, discoloration or deterioration of physical properties is caused, and a decorative board to which an organic antibacterial agent is added has heat resistance and the like. There is a problem that the stability is low and the surface appearance of the decorative board is easily impaired due to discoloration or the like when used for a long time.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide an antibacterial agent used for walls and ceilings of kitchens, washrooms, dressing rooms, and the like. The present invention provides an inorganic decorative board having good antibacterial properties, which is excellent in surface properties such as stain resistance, abrasion resistance, chemical resistance and the like, and has excellent antibacterial properties. An object of the present invention is to provide a manufacturing method capable of easily manufacturing a board.

[0006]

Means for Solving the Problems To achieve the above object, a solution of the present invention is to provide a sealer layer, an adhesive layer, a paper-based substrate sheet layer, a pattern printing layer, a transparent layer on a top surface of an inorganic-based substrate. In an inorganic decorative board in which a resin layer and a top coat layer are sequentially laminated, the top coat layer is an inorganic decorative board having an antibacterial property formed by a curable resin paint to which an inorganic antibacterial agent is added. . With this configuration, the top coat layer is formed of a curable resin containing an inorganic antibacterial agent on the surface of the pattern printing layer provided on the upper surface of the inorganic base material, so that the surface of the inorganic decorative board has antibacterial performance. Is added, and the generation of mold and bacteria can be suppressed. Further, a fine pattern printing layer can be formed on the upper surface of the inorganic base material.

[0007] The curable resin forming the top coat layer is made of a thermosetting resin.
By doing so, the stain resistance, scratch resistance,
An inorganic decorative board having improved chemical resistance and excellent surface properties can be obtained.

[0008] The present invention is characterized in that the top coat layer is formed of a thermosetting resin paint to which a liquid repellent is added. By doing so, the surface provided with the transparent resin layer is coated with a thermosetting resin paint to which a liquid repellent has been added, so that the liquid repellency is increased, the uneven shape is emphasized, and the surface design is strongly expressed. It is possible.

The inorganic antibacterial agent has an average particle size of 0.0
It is composed of silver-based inorganic antibacterial agent fine particles in the range of 5 to 0.5 μm, and is 0.5 to 5.
It is characterized by containing 0% by weight. By doing so, the dispersibility of the inorganic antibacterial agent in the curable resin coating is improved, and the inorganic antibacterial agent does not settle after painting. Can be imparted, and in particular, uniform antibacterial properties can be exhibited even in the uneven portion. Further, it is possible to obtain a decorative plate excellent in design without changing the gloss state of the top coat layer.

A step of preparing a paper-based decorative sheet in which a pattern printing layer and a transparent resin layer are laminated on one surface of a paper-based substrate sheet, a step of coating a sealer layer on the upper surface of an inorganic substrate,
Attaching the paper-based decorative sheet to the sealer layer surface of the inorganic base material via an adhesive layer, and applying and curing a curable resin paint containing an inorganic antibacterial agent to the transparent resin layer surface of the paper-based decorative sheet. A method of manufacturing an inorganic decorative board having antibacterial properties, characterized by comprising a step of forming a top coat layer by performing the above steps, whereby an inorganic decorative board having the above-described effects can be easily and reliably manufactured. You can do it.

[0011]

Embodiments of the present invention will be described below 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 showing another embodiment of the inorganic decorative board of the present invention, and FIG. 3 is an inorganic decorative board of the present invention. FIG. 1 is a cross-sectional view for explaining an example of the production method of the present invention, wherein 1 and 1 ′ are an inorganic decorative board, 2 is an inorganic base material, 3 is a sealer layer, 4 is an adhesive layer, 5 is a paper base material sheet, 6 Is a pattern printing layer, 6a is a solid ink layer, 6b is a pattern ink layer, 7 is a transparent resin layer, 8 is a paper type decorative sheet,
Reference numeral 9 denotes a top coat layer, and reference numeral 10 denotes an uneven pattern.

As shown in FIG. 1, the inorganic decorative board 1 of the present invention has a paper base sheet via an adhesive layer 4 on a sealer layer 3 provided on an upper surface of an inorganic base 2. 5 is laminated with a paper-based decorative sheet 8 provided with a pattern printing layer 6 composed of a solid ink layer 6a and a pattern ink layer 6b and a transparent resin layer 7, and a curable resin paint to which an inorganic antibacterial agent is added. It has a configuration in which the formed top coat layer 9 is laminated, and has an antibacterial property on the surface.

FIG. 2 shows the structure of an inorganic decorative board 1 'according to another embodiment of the present invention. The sealer layer 3 is provided on the upper surface of the inorganic base material 2 with an adhesive layer 4 interposed therebetween. After the paper-based decorative sheet 8 is laminated in the same manner as the inorganic decorative sheet 1, a thermosetting resin paint in which an inorganic antibacterial agent and a liquid repellent are added over the entire surface of the transparent resin layer 7 of the paper-based decorative sheet 8. Top coat layer 9 consisting of uneven pattern 10 formed by
And the design is enhanced by the uneven pattern 10 on the surface.

Next, a method of manufacturing the inorganic decorative board 1 'having the above structure and having an antibacterial property and a concavo-convex pattern on the surface will be described with reference to the drawings. First, as shown in FIG. 3A, a paper-based decorative sheet 8 having a pattern printing layer 6 composed of a solid ink layer 6a and a pattern ink layer 6b and a transparent resin layer 7 provided on the upper surface of a paper-based substrate sheet 5 is prepared. prepare. Next, as shown in FIG. 3B, a sealer layer 3 is provided on the surface of the inorganic base material 2. Next, as shown in FIG.
A paper-based decorative sheet 8 is adhered to the surface of the sealer layer 3 via an adhesive layer 4. Further, as shown in FIG. 3 (d), a thermosetting resin paint containing an inorganic antibacterial agent and a liquid repellent is applied to the upper surface of the transparent resin layer 7 including the picture print layer 6, and cured. The inorganic decorative board 1 having antibacterial properties and having the top coat layer 9 formed of the uneven pattern 10 formed thereon is obtained.

The inorganic base material 2 used for the inorganic decorative board 1 of the present invention is generally a calcium silicate board,
Examples include cement boards such as asbestos slate board, lightweight foam concrete board, hollow extruded cement board, etc., gypsum boards such as gypsum board and gypsum slag board, and fiber cement boards such as pulp cement board, asbestos cement board and wood chip cement board.

The sealer layer 3 is used to prevent alkaline components from being eluted from the inorganic base material 2 and to form a paper-based decorative sheet 8.
It is provided for the purpose of improving the adhesion between the resin and the inorganic base material 2. As a method for improving the quality performance, polyisocyanate resin, moisture-curable urethane resin, styrene-acryl The sealer layer 3 made of a curable resin such as an acid ester copolymer resin is desirable.

The configuration of the paper-based decorative sheet 8 for forming the picture print layer 6 on the inorganic decorative board 1 is shown in FIG.
As shown in (a), a pattern printing layer 6 composed of a solid ink layer 6a and a pattern ink layer 6b is provided on one side of a paper-based substrate sheet 5, and a transparent resin layer 7 is laminated thereon. . The paper base sheet 5 has a weighing of 23 to 6
5 g / m ² of building materials for printing paper, printing pure white paper, or a thermoplastic synthetic resin by混抄to enhance interlayer strength tissue paper (so-called intensive printing paper), and the surface not only the price is inexpensive smooth It is preferable because of its excellent suitability.

The pattern printing layer 6 is provided with a solid ink layer 6a of solid printing on the entire surface and a pattern ink layer 6b expressing, for example, a stone pattern, a cloth pattern, a surface pattern of natural leather, an abstract pattern, and the like. Known vehicles can be used as the vehicle of the ink, for example, acrylic, vinyl chloride, vinyl chloride-vinyl acetate copolymer, chlorinated polyolefin,
As needed, a mixture of a single substance or a mixture composed of a resin such as nitrocellulose and urethane, a coloring agent such as a pigment and a dye, an extender pigment, and a solvent can be used. Among them, an ink obtained by adding an isocyanate curing agent to a nitrocellulose resin is preferable because of its excellent adhesion. The solid ink layer 6a can also contain a brilliant pigment together with the coloring pigment. Further, the solid ink layer 6a contains only the coloring pigment and is formed without the brilliant pigment, and the pattern ink layer 4b is formed. It is also possible to include a glitter pigment.

The transparent resin layer 7 is provided between the pattern printing layer 6 and the top coat layer 9 to improve the unevenness of the top coat layer 9 and to make the surface of the pattern printing layer 6 a transparent synthetic resin. By covering with a layer, the disappearance of the picture due to the friction in the concave portions of the concavo-convex pattern 10 is prevented. As the resin used for the transparent resin layer 7, a curable resin such as a urethane resin, an acrylic resin, or a polyester resin is suitable, and a two-component curable acrylic urethane resin is particularly preferably used.

A coating material containing an inorganic antibacterial agent and a liquid repellent for forming the top coat layer 9 having a desired uneven pattern 10 is made of a known thermosetting resin as a vehicle, and an antibacterial agent and a liquid repellent are added to the vehicle. If necessary, other additives, for example, a colorant such as a pigment or a dye, an extender pigment, a solvent, a stabilizer, a plasticizer, a curing agent, and the like can be appropriately mixed. As a vehicle for forming the top coat layer 9, it is desirable to form a film having excellent surface properties such as stain resistance, scratch resistance, and solvent resistance, such as unsaturated polyester resin, epoxy resin, and polyurethane resin. Thermosetting resin is mentioned, among which as a main agent,
A polyol component having an OH group such as an acrylic polyol, a polyester polyol, a polyether polyol, or an epoxy polyol is used, and an isocyanate compound such as tolylene diisocyanate, hexamethylene diisocyanate, or meta-xylene diisocyanate is added as a curing agent. Liquid-curable urethane resins are preferably used.

Examples of the inorganic antibacterial agent used in the present invention include a silver-based inorganic antibacterial agent having silver ions carried on various inorganic substances, for example, an antibacterial zeolite composition having silver ions carried by ion exchange, and silver oxide. Added antibacterial glass, an antibacterial agent in which silver ions are supported on zirconium phosphate by ion exchange, an antibacterial agent obtained by adsorbing and holding silver ions in hydroxyapatite and firing, and a silver in magnesium aluminosilicate An antibacterial agent carrying an ion and the like can be mentioned. In particular, an antibacterial zeolite composition and an antibacterial ceramic can be suitably used. Specific examples of the silver-based inorganic antibacterial agent include commercially available products such as "Zeomic AJ10N" (manufactured by Sinanen Zeomic, zeolite carrying silver ions), and "antibacterial sera coat C01" (antibacterial ceramics manufactured by Shinto V Celax). Available.

The amount of the silver-based inorganic antibacterial agent to be added is in the range of 0.5 to 5.0% by weight, preferably 1.0 to 2.0% by weight, based on the solid content of the curable resin paint. If the addition amount is less than 0.5% by weight, the antibacterial effect tends to decrease. If the addition amount exceeds 5.0% by weight, the effect is not improved and the cost is increased. Further, by using ultrafine particles having an average particle size of the silver-based inorganic antibacterial agent in the range of 0.05 to 0.5 μm, the dispersibility in the curable resin paint becomes good, and after the coating, the silver Since there is no sedimentation of the inorganic inorganic antibacterial agent, remarkable antibacterial performance can be imparted to the surface of the inorganic decorative plate with a small amount of addition. In particular, a uniform antibacterial property is exhibited in the uneven portion, and the surface condition also exhibits a uniform glossy state in the uneven portion, so that an inorganic decorative plate excellent in antibacterial property and design can be obtained. 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, for example, toluene, methyl ethyl ketone, alcohol, or the like. Therefore, it is possible to supply the topcoat paint in a stable state in which the paint is excellent in dispersibility in the paint and does not settle and solidify even when left standing.

As the liquid repellent used in the paint for forming the top coat layer 9 having the concavo-convex pattern of the present invention, known liquid repellents, for example, silicone, polyethylene wax, paraffin wax, amide wax, wax wax, vinyl fluoride compound, etc. Liquid repellent substance can be used, and silicone is preferable. The addition amount is 0.01 to 10% by weight, preferably 0.2 to 10% by weight.
2.0% by weight.

As the pigment to be added to the paint for forming the top coat layer 9 having the concavo-convex pattern, commonly used organic or inorganic pigments and brilliant pigments can be used.
Then, in order to further show a three-dimensional effect, it is preferable to use a glitter pigment. As the brilliant pigment, for example,
Pearl pigments, specifically crushed shells and pearls, baked titanium oxide or iron oxide on mica fine particles, metal powder (for example, copper, aluminum, brass, bronze, gold, silver Etc.) preferably 1 to 120
μm fine particles, deposited plastic fragments, for example, the above-mentioned metal (usually aluminum) deposited on a polyethylene terephthalate film and crushed (silver powder), and then crushed by a transparent yellow coating after deposition. (Golden powder). The amount of the brilliant pigment added to the paint containing the liquid repellent is preferably 1 to 10% by weight. That is, when the pigment addition amount is as low as less than 1% by weight, the unevenness of the repelling pattern is hardly emphasized, and when the pigment addition amount is as high as 10% by weight or more, the printed pattern is concealed and the design is inferior. Become.

As a coating method, known coating means such as a gravure printing method, a roll coating method, a reverse roll coating method, a sponge roll coating method, and the like can be used. The coating amount is 10 to 100 g / m ² (wet state), and preferably 20 to 50 g / m ² (wet state). When the coating amount is as small as less than 20 g / m ² , it is difficult to form coating unevenness or a liquid-repellent portion as a concave portion, resulting in poor design. On the other hand, when the coating amount is as large as 50 g / m ² or more, the coating of the liquid-repellent portion is repelled to form insufficient concave portions, and the layer is formed unnecessarily thick, which is disadvantageous in cost. In addition to this, the lower pattern printing layer is hard to see and the design is inferior.

[0026]

【Example】

Example 1 A solid ink layer and a desired pattern ink layer were printed on a thin paper having a basis weight of 30 g / m ² using an ink obtained by adding an isocyanate curing agent to a nitrocellulose resin using a gravure rotary printing machine. A two-component curable acrylic urethane-based resin was applied as a transparent resin layer to prepare a paper-based decorative sheet. Separately, 30 g / m ² of a polyisocyanate-based resin coating was applied as a sealer layer to a 3 mm-thick calcium silicate plate, dried at 80 ° C. for 20 minutes, and then the sealer surface was sanded to prepare an inorganic substrate. Then, after bonding the paper-based decorative sheet obtained above to the surface of the sealer layer of the inorganic substrate via a two-liquid curable urea resin-based adhesive, the two-liquid curable type containing a liquid repellent on the transparent resin layer surface. A transparent paint in which a silver-based inorganic antibacterial agent is mixed with an acrylic urethane paint is applied using a sponge roll coater so that the application amount is 40 g / m ² (wet),
It was dried and cured for 0 minutes to form a top coat layer having an uneven pattern on the surface, thereby producing an inorganic decorative board having antibacterial properties. At this time, the addition amount of the silver-based inorganic antibacterial agent (percentage by weight based on the resin solid content) was variously changed as shown in Table 1.

The antibacterial test was carried out on the inorganic decorative board produced in the above-mentioned Example by the following method, and the results are shown in Table 1.

(Antibacterial test) Each test piece (50 × 50 m
m), 0.5 ml of Staphylococcus aureus and Escherichia coli was added dropwise to the solution under 35 ± 1 ° C. and a relative humidity of 90% or more.
The cells were cultured for 4 hours. Thereafter, the surface of the phosphate buffer (10 ml) test piece was washed out, and the number of surviving bacteria per 1 test piece was measured for 1 ml of the washed out solution using a standard agar medium by a pour culture method. It was 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.

[0029]

[Table 1] As can be seen from the above results, in Test Examples 2 to 7, good results were obtained in the surface state and antibacterial performance. On the other hand, in Test Example 8, the antibacterial performance was good, but the surface condition was slightly poor. In Test Example 9, both the surface state and the antibacterial performance were slightly poor.

[0030]

As described above, the present invention imparts antibacterial properties to the surface of an inorganic decorative plate. Therefore, antibacterial performance can be imparted by using this inorganic decorative panel as a surface material such as a wall surface or a ceiling surface of a kitchen, a washroom, a dressing room, etc. Can be retained.

Further, since the paper-based decorative sheet provided with the pattern printing layer is adhered to the surface of the inorganic base material via the adhesive layer, a fine pattern can be displayed. To apply a coating containing a liquid-repellent agent to the surface of the transparent resin layer provided on the upper surface of the layer, to obtain an inorganic decorative board having an increased liquid-repellent property, emphasizing unevenness, and having a very realistic design property. Can be done.

Further, by using a paper-based decorative sheet provided with a pattern printing layer and a transparent resin layer, the process is simplified, the production efficiency is improved, and materials to be discarded such as a transfer base sheet are used. Therefore, the cost can be reduced and an inexpensive inorganic decorative plate can be obtained.

[Brief description of the drawings]

FIG. 1 is a laminated sectional view showing an embodiment of an inorganic decorative board of the present invention.

FIG. 2 is a laminated sectional view showing another embodiment of the inorganic decorative board of the present invention.

FIG. 3 is a cross-sectional view illustrating an example of the method for producing an inorganic decorative board of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inorganic decorative board 2 Inorganic base material 3 Sealer layer 4 Adhesive layer 5 Paper base material sheet 6 Picture printing layer 6a Solid ink layer 6b Picture ink layer 7 Transparent resin layer 8 Paper quality decorative sheet 9 Top coat layer 10 Rough pattern

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B32B 33/00 B32B 33/00

Claims (5)

[Claims] 1. An inorganic decorative board in which a sealer layer, an adhesive layer, a paper-based substrate sheet layer, a pattern printing layer, a transparent resin layer, and a top coat layer are sequentially laminated on an upper surface of an inorganic-based substrate, An inorganic decorative board having antibacterial properties, wherein the topcoat layer is formed of a curable resin paint to which an inorganic antibacterial agent is added. 2. The inorganic decorative board having antibacterial properties according to claim 1, wherein the curable resin forming the top coat layer comprises a thermosetting resin. 3. The antibacterial inorganic decorative board according to claim 1, wherein the top coat layer is formed of a thermosetting resin paint to which a liquid repellent is added. 4. The inorganic antibacterial agent has an average particle size of 0.1.
Consisting of silver-based inorganic antibacterial agent fine particles in a range of from 0.5 to 0.5 μm,
The inorganic decorative board having antibacterial properties according to claim 1, wherein the decorative board contains 5.0% by weight. 5. A step of preparing a paper-based decorative sheet in which a picture printing layer and a transparent resin layer are laminated on one surface of a paper-based substrate sheet, a step of painting a sealer layer on an upper surface of an inorganic-based substrate, Adhering the system decorative sheet to the sealer layer surface of the inorganic base material via the adhesive layer, and applying and curing a curable resin paint containing an inorganic antibacterial agent on the transparent resin layer surface of the paper type decorative sheet. A method for producing an inorganic decorative board having antibacterial properties, comprising a step of forming a top coat layer by the method.