JPH07126119A - Decorative material having antimicrobial performance and used for partition - Google Patents

Abstract

PURPOSE:To provide a partition decorative material having an antimicrobial property by extremely thinly coating the most front surface of a decorated substrate with a resin removed in substances affecting the antimicrobial agent, such as a pigment, a dye, a hardening agent, and a catalyst. CONSTITUTION:An antimicrobial decorative material used for partitions is produced by forming a 2-10mum thick antimicrobial resin layer on the most front surface resin layer of a decorative material produced by forming at least one of resin layers (e.g. a base coat layer 13, a barrier layer 16) on the surface of a substrate such as a steel plate or plywood with a resin composition comprising a colored pigment-free transparent resin containing 1-10wt.% of an antimicrobial zeolite added thereto. The decorative material can maintain rooms hygienically, because of exhibiting an antimicrobial action against adhered bacteria, when the decorative steel plate or decorative board having the antibacterial property is used as the partition board, screen, toilet booth, etc., of hospitals. Furthermore, the pollution of hospital articles with nosocomial infection bacteria can be prevented. Since the antimicrobial agent is added to the extremely thin layer in the decorative board, the antimicrobial agent can give the antimicrobial effect in a fine amount, and is thereby profitable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a partition, a partition, a toilet booth, etc. in which a decorative material such as a wooden board or a metal plate is provided with antibacterial properties.

[0002]

2. Description of the Related Art Conventionally, in order to impart antifungal property or antibacterial property to a decorative paper or a veneer, a method of adding or kneading an antifungal agent or an antibacterial agent into a corresponding material, or in a subsequent step. The method of coating was performed (Japanese Patent Publication No. 63-54013, Japanese Patent Publication No. 4-28646, etc.). Further, wallpaper and decorative sheets having antifungal properties and antibacterial properties are also known and commercially available (JP-A-1-313533). However, antibacterial properties are required only for the very thin surface of the decorative material, but conventionally, the method of kneading into a resin or the method of kneading into a paint has been adopted, and it is not always the most suitable method for forming an antibacterial coating film. I couldn't say that.

[0003]

[Problems to be Solved by the Invention] Conventionally, various equipment (electric appliances, indoor appliances, kitchen appliances, bathroom appliances, laundry areas, etc., hot and humid places, hospitals and other places where a hygienic environment is required. About various appliances, building materials toilet booths, etc.)
There is a demand for products that can prevent the generation of mold and bacteria. However, when kneading an antifungal agent or an antibacterial agent into a plastic molded product, etc., the manufacturing process and cost increase,
Problems such as reduced productivity tend to occur. Further, when an antibacterial agent is kneaded into a molding resin or a coating resin, a pigment, a dye, a curing agent, a catalyst, etc. are mixed in the resin,
These substances may adversely affect the antibacterial agent, and suitability with each resin needs to be individually examined. Therefore, the conventional resin composition cannot be used as it is, and the base material,
It is necessary to examine the resin composition for each application, which causes a problem that the work becomes complicated. Also, when the antibacterial agent is kneaded into the molding resin, most of the antibacterial agent is kneaded into the resin and does not show an antibacterial effect in the molded product, so it is economical to use the antibacterial agent. It becomes a big problem.

The present invention solves these problems.
A resin composition prepared by mixing an antibacterial agent containing a metal ion such as an antibacterial zeolite and a metal compound with a resin from which a substance that adversely affects the antibacterial agent such as a pigment, a dye, a curing agent, and a catalyst has been removed, and the resin composition is cosmetically processed. The purpose is to impart an antibacterial property to the product by applying it very thinly on the outermost surface of the base material.

[0005]

In a decorative material in which at least one resin layer is formed on the surface of a base material, the outermost surface layer of the resin layer comprises a transparent resin containing no coloring pigment and an antibacterial zeolite of 1 to 1 A resin composition containing 10% by weight and having a thickness of 2 to
A 10 μm antibacterial resin layer was formed to provide a partitioning decorative material having antibacterial properties. The antibacterial zeolite is a part or all of the ion-exchangeable ions of the zeolite silver, copper,
Those substituted with ions such as zinc, tin, lead, mercury and ammonium were used. Particularly, by forming the antibacterial resin layer of the present invention on a decorative steel plate, wood plywood, etc., a hospital partition, a partition,
When used in a toilet booth or the like (in the present invention, these are collectively treated as a partition in a broad sense), it has a bactericidal action against adhered bacteria and is therefore effective in keeping the room clean.

[0006]

[Function] The thin antibacterial resin layer of the present invention is partitioned, partitioned,
By forming it on the surface of a toilet booth or the like, it is possible to prevent the growth of mold and bacteria and make the indoor environment hygienic in hot and humid places, hospitals and other places where a hygienic environment is required. Further, by setting the addition amount and coating thickness of the antibacterial zeolite as in the scope of the present claims, the antibacterial zeolite particles in the transparent resin coating film are more likely to stick their heads out of the coating surface, and the antibacterial and prevention The ratio of those that contribute to the mold action becomes high.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an example of a decorative material for partitions having antibacterial performance according to the present invention. FIG. 2 is a cross-sectional view showing an example of a decorative steel sheet for partitions having antibacterial performance. FIG. 3 is a cross-sectional view showing another example of a decorative steel sheet for partitions having antibacterial performance. FIG. 4 is a cross-sectional view showing an example of a decorative plywood having antibacterial properties. As shown in FIG. 1, 1 to 10 of the antibacterial zeolite 12 is added to the base material 14 in a transparent paint containing no pigment, filler or the like, based on the dry matter weight.
Apply the resin composition added by weight% to a thickness of 2 to 10 μm.
The antibacterial resin layer 11 of m is formed to produce the decorative material 1 having antibacterial performance.

The partition, partition, and antibacterial function of the present invention
Base materials used in toilet booths, etc. are ceramics such as metal plates such as iron, aluminum and copper, wood veneer, wood plywood, wood plywood such as particle board, gypsum board, concrete board, calcium silicate board, etc. A suitable composite of the plates or materials of each of the above substrates may be used.

The decorative material is usually provided with a base coat layer and a pattern layer. As the resin used for the base coat layer, thermoplastic resins such as polyvinyl chloride and acrylic, and thermosetting unsaturated polyester, polyurethane, epoxy, melamine and the like are used. Resins that have been conventionally used to make decorative materials, such as resin, acrylic resin, unsaturated polyester resin, and other ionizing radiation curable resins, can be used. In addition, pigments, dyes, fillers, catalysts, cross-linking agents, stabilizers, dispersants, solvents and diluents necessary for making a decorative material are appropriately added to the above resin, and the mixture is kneaded and used as a coating liquid. To be done.

However, when these substances are added together with an antibacterial agent, the antibacterial property may be inhibited, or the antibacterial agent and the reducing component may react with each other to cause discoloration, which is different from the antibacterial agent. Need to be formed as a layer. Therefore, in order to impart a color design and physical properties to the substrate, substances that must be added to the coating film must be added to the base coat layer. Of course, the antibacterial resin layer may be formed directly on the substrate when an additive that interacts with the colorant or the antibacterial agent and adversely affects it is not required.

As the resin used for the antibacterial resin layer,
It is necessary that a substance that adversely affects the antibacterial agent is not contained, and that a substance that reacts with the antibacterial agent and is colored or that is discolored by heat, light, ionizing radiation, or the like cannot be used. In particular, the acid catalyst used for curing the thermosetting resin, the compound having the property of reducing metal ions of the antibacterial agent, etc. should not be added. As the thermoplastic resin satisfying the above conditions, vinyl resin such as polyvinyl chloride, methyl poly (meth) acrylate, ethyl poly (meth) acrylate, poly (meth)
Homo- or copolymers of (meth) acrylic acid esters such as butyl acrylate (however, (meth) acrylic means acrylic or methacrylic), acrylic resin-based resins, aminoalkyd resin-based resins, alkyl resin-based resins and the like.

As the thermosetting resin, there are polyester resin type, epoxy resin type, polyurethane resin type and the like.

The ionizing radiation curable resin is a monomer and / or prepolymer containing a polymerizable unsaturated group such as a (meth) acryloyl group or a (meth) acryloyloxy group, an epoxy group or a thiol group in the molecule. It is a product obtained by polymerization (crosslinking reaction, addition reaction, etc.) of a composition consisting of (1) and curing by ionizing radiation, and electron beams, ultraviolet rays, etc. are used as the ionizing radiation.

As the antibacterial agent added to the resin composition forming the antibacterial resin layer, commercially available industrial antibacterial agents can be used. Industrial antibacterial agents include organic antibacterial agents and inorganic antibacterial agents. Inorganic antibacterial agents are suitable for the present invention in terms of heat stability, chemical stability, light stability and the like. In particular, as an inorganic antibacterial agent, Japanese Examined Patent Publication No. 63-54013,
Some or all of the ion-exchangeable ions of zeolite disclosed in Japanese Examined Patent Publication No. 28628/1992 are silver,
An antibacterial zeolite substituted with ions of copper, zinc, tin, lead, mercury, cobalt, ammonium and the like is preferable.

In addition, as described in JP-A-4-300975, a non-zeolitic anhydrous aluminosilicate carrying a metal or metal ion such as silver, copper, zinc, nickel, manganese, or cobalt. , Apatite, borate, silicate, and one or more kinds of sintered powders can be used as the antibacterial agent.

Further, a compound represented by the following general formula [1] as disclosed in JP-A-5-59308 can also be used as an antibacterial agent. M ¹ _{a Ab} M ² _c (PO ₄ ) _d · nH ₂ O [1] M ¹ is silver, copper, zinc, tin, mercury, lead, cobalt, nickel, manganese, arsenic, antimony, bismuth, barium, cadmium Or at least one metal ion selected from chromium, A is at least one ion selected from alkali metal ions, alkaline earth metal ions, ammonium ions or hydrogen ions, and M ² is 4
It is a valent metal, n is a number satisfying 0 ≦ n ≦ 6, a and b are both positive numbers, and c and d are la + mb = 1.
, C = 2, d = 3, la + mb = 2, c = 1,
d = 2. However, 1 is the valence of M ¹ and m is the valence of A.

Regarding the particle size of the above-mentioned inorganic antibacterial agent, the addition amount is 1 to 10% by weight, and the coating thickness (dry matter) is 2 to 10 μm.
On the other hand, it is preferable to use one having an appropriate particle size distribution in the range of 0.1 to 10 μm in order to give the maximum antibacterial action with the minimum addition amount. A particle size of 5 to 8 μm is particularly preferable. It is necessary to remove components that adversely affect the antibacterial agent from the resin composition to which the antibacterial agent is added, and a simple system of resin component, solvent and antibacterial agent is desirable. When the resin composition forms a coating film,
Most of them are desired to be transparent, and therefore, when an inorganic antibacterial agent that does not dissolve in a solvent is added, the addition amount is limited. Furthermore, metals such as silver and nickel often cause discoloration, deterioration and deterioration of organic compounds, and in this respect too, excessive addition is not preferable. This effect is particularly great in the case of polyvinyl chloride and polyester.

In the case of the above-mentioned antibacterial agent, the content of the antibacterial zeolite is preferably in the range of 1 to 10% by weight as the amount of dry matter when the resin composition forms a coating film. 5% by weight is preferred. If the content of the antibacterial zeolite exceeds 10% by weight, the above problems cannot be ignored, and if it is less than 1% by weight, a sufficient antibacterial action cannot be obtained.

As a method of forming an antibacterial resin layer on a base-coated substrate using a resin composition containing an antibacterial agent, gravure coat, roll coat, air knife coat, kiss coat, spray coat, wheeler coat, curtain flow Coat, brush painting or gravure printing,
It can be performed by gravure offset printing, intaglio printing, silk screen printing, or the like.

Since the antibacterial resin layer exerts the maximum antibacterial effect with the minimum addition amount, it is necessary that a part of the antibacterial agent particles is exposed on the surface of the coating film, and the addition amount of the antibacterial agent is 1 to 10% by weight. %, The thickness of the coating film should be about 2 to 10 μm, preferably about 2 to 5 μm. When the coating amount is insufficient depending on the coating method, overprinting may be performed from one coat to two to three coats. However, when the particle size of the antibacterial agent is large or the amount of the antibacterial agent is increased, the antibacterial effect can be exhibited even if the thickness of the coating film exceeds 10 μm, but transparency is not desired. In addition, the proportion of substances that are enclosed inside the coating film and do not directly contribute to the antibacterial action increases. If the coating film has a thickness of less than 2 μm, the sufficient durability of the coating film and the binding force for sticking the above-mentioned particle size and the amount of the inorganic antibacterial agent to the coating film become insufficient.

Next, the first embodiment will be described below as a specific example. As shown in FIG. 2, the substrate 14 has a thickness of 0.5.
~ 0.8 mm galvanized iron plate (manufactured by Nippon Steel Corporation)
Curtain treatment using a thermosetting polyester resin solution (manufactured by The Inktech Co., Ltd.) containing a titanium dioxide color pigment and an acid catalyst. The base coat layer 13 having a thickness of 20 μm was formed by the coating method. In addition, as the pattern layer 15, a polyester resin ink (The Inktech Co., Ltd.)
The grain pattern was gravure offset printed by two-color printing. Next, the following antibacterial agent-added resin liquid is used to dilute to an appropriate viscosity with an organic solvent, and the antibacterial resin layer 11 is formed by coating with a gravure offset coating method so as to have a thickness of 3 μm. The decorative steel plate 1 was prepared and used as a partition steel plate.・ Composition of resin liquid containing antibacterial agent Antibacterial zeolite (particle size distribution 5 to 8 μm) (manufactured by Shinagawa Fuel Co., Ltd.) 1.5% by weight Curable polyester resin (without acid catalyst) 98.5% by weight

The second embodiment is a case where a barrier layer 16 is provided between the base coat layer 13 and the antibacterial resin layer 11,
The configuration is shown in FIG. As a base material, a pretreated zinc-plated iron plate having a thickness of 0.5 to 0.8 mm was subjected to primer coating, and then the same thermosetting polyester resin as that used in the first example was used to obtain a thickness of 20 by a curtain flow coating method.
A base coat layer 13 having a thickness of 2 μm is formed by a gravure offset coating method using a clear ink that is a polyester resin and does not contain any pigment, acid catalyst or antibacterial agent. did. Further, the following antibacterial agent-added resin liquid was used to dilute to an appropriate viscosity using an organic solvent, and a thickness of 3 μm was obtained by a gravure offset coating method.
The antibacterial resin layer 11 of m was formed, and the decorative steel plate 1 having antibacterial performance was produced to be a tray booth steel plate.・ Composition of resin liquid containing antibacterial agent Antibacterial zeolite (particle size distribution: 5 to 8 μm) (manufactured by Shinagawa Fuel Co., Ltd.) 5% by weight Curable polyester resin (without acid catalyst) 95% by weight

In the third embodiment, a wood plywood is used as the base material, and the construction is as shown in FIG. A primer coat layer 17, a base coat layer 13 having a thickness of 20 μm, a pattern layer 15 and an antibacterial resin layer 11 having a thickness of 3 μm are formed on a base material 14 of lauan plywood (thickness 5 mm) in the same manner as in the first embodiment. Then, a decorative plywood 1 having antibacterial properties was prepared and used as a partition plywood.

(Comparative Example) As a comparative example, an antibacterial zeolite was added to the same thermosetting polyester resin solution as in the first example by using the same substrate as in the first example treated in the same manner. The antibacterial resin layer 11 was formed from a resin composition in which 0.5% by weight of 12 and a titanium dioxide pigment were added to produce a decorative steel sheet having a structure as shown in FIG.

(Antibacterial Test) The decorative steel sheets and the decorative plywood produced in the above-mentioned Examples and Comparative Examples were tested for their inhibitory effect on bacteria by the following method. Test strain-Escherichia coli IFO 3301
(E. coli) ・ Methicillin Resistant Staphylococcus aur
eus) (methicillin-resistant Staphylococcus aureus) Preparation of test bacterial solution in ordinary broth medium (Eiken Chemical Co., Ltd.) at 35 ° C., 16
The culture solution of the test strain that had been shake-cultured for 20 hours was diluted 20,000 times with a sterile phosphate buffer solution to obtain a bacterial solution. In addition, the number of viable bacteria was separately measured for the bacterial solution. Antibacterial test 1 Bacteria liquid 1 on the antibacterial resin layer surface of the sample
ml was added dropwise, and after storing at 25 ° C. for 24 hours, the number of bacteria was measured to determine the antibacterial performance of the sample. As a control sample, 1 ml of the bacterial solution was dropped on a petri dish and tested in the same manner. Measurement of viable cell count Samples and control samples stored for 24 hours were washed out with 10 ml of SCDLP medium (manufactured by Nippon Pharmaceutical Co., Ltd.), and the wash-out solution was a pour plate using standard agar medium (manufactured by Eiken Chemical Co., Ltd.) The viable cell count was measured by a culturing method (cultured at 35 ° C. for 2 days), and the bacterial cell count per specimen and control sample was calculated.

The test results are shown in Table 1, and all the samples have antibacterial properties, and the antibacterial effect of the decorative steel sheet and the decorative plywood having the antibacterial performance of the present invention can be demonstrated.

[0027]

[Table 1] * E.coli: Escherichia coli IFO 3301 * MRSA: Methicillin Resistant Staphylococcus a
ureus

(Chemical resistance test) The decorative steel sheets and the decorative plywood produced in the above Examples and Comparative Examples were subjected to a chemical resistance test by the following method. As test reagents, acetic acid, hydrochloric acid, sulfuric acid, caustic soda, 5% aqueous solution of ammonia, and magic phosphorus stock solution were used. The test method was to immerse the test piece in an aqueous solution of the above-mentioned reagent and an undiluted solution at a liquid temperature of 20 ° C. for 24 hours, and then wash the test piece with water to compare the color, appearance and the like with a control untested sample. The evaluation method is indicated by ◯ Δx as follows. ◯: No discoloration Δ: Little discoloration ×: Significant discoloration The test results are shown in Table 2, and all of the decorative steel sheets produced in Examples were superior in chemical resistance to Comparative Examples.

[0029]

[Table 2]

[0030]

The effect of the present invention, a decorative steel sheet having the antibacterial performance of the present invention,
When using makeup plywood for hospital partitions, partitions, toilet booths, etc., it shows a bactericidal action against adhered bacteria,
It can be expected to keep the room clean and prevent contamination of hospital-acquired bacteria. Further, since the partition, partition, toilet booth, etc. having the antibacterial performance of the present invention has an antibacterial agent added to a very thin layer of the surface, it is possible to impart an antibacterial effect in a small amount, and economically. Is also advantageous.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a partitioning decorative material having antibacterial properties according to the present invention.

FIG. 2 is a sectional view of a decorative steel sheet having antibacterial performance according to the first embodiment.

FIG. 3 is a sectional view of a decorative steel sheet having antibacterial performance according to a second embodiment.

FIG. 4 is a cross-sectional view of a decorative plywood having antibacterial performance according to a third embodiment.

FIG. 5 is a cross-sectional view of a decorative steel sheet having antibacterial performance according to a comparative example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Decorative material having antibacterial performance 11 Antibacterial resin layer 12 Antibacterial zeolite 13 Base coat layer 14 Base material (steel or plywood) 15 Picture layer 16 Barrier layer 17 Primer coat layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Yamamoto 4013 Nakatsu, Aikawa-cho, Aiko-gun, Kanagawa Dainichimoto Elio Co., Ltd. (72) Inventor Takashi Hasegawa 4013 Nakatsu, Aikawa-cho, Aiko-gun, Kanagawa (72) Inventor Masato Horikiri 450 Aotomachi, Midori-ku, Yokohama, Kanagawa Prefecture The Intec Co., Ltd. (72) Inventor Tomoaki Mukaiyama 450 Aoto-cho, Midori-ku, Yokohama, Kanagawa Prefecture The Intechc Co., Ltd.

Claims (1)

[Claims] 1. A decorative material having at least one resin layer formed on the surface of a substrate, wherein the outermost surface layer of the resin layer contains 1 to 10% by weight of an antibacterial zeolite in a transparent resin containing no coloring pigment. A decorative material for partitions having antibacterial performance, characterized in that an antibacterial resin layer having a thickness of 2 to 10 μm is formed from the resin composition.