JPH11322392A - Antimicrobial artificial stone and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antimicrobial artificial stone having a dense texture, a transparent feeling, deepness and an excellent marble-like color tone by mixing a high-density artificial stone composition comprising an inorganic granule component, an inorganic find granule component and a resin component with a specific amount of an antimicrobial agent. SOLUTION: This artificial stone comprises a composition composed of >=85 wt.% of the total of an inorganic granule component having 10-70 meshes and an inorganic fine granule component having a size smaller than 100 meshes and <15 wt.% of a resin component. The composition comprises 0.5-5.0 wt.% of an antimicrobial agent constituted of an inorganic material such as silver, a silver allay, silver oxide, etc. The inorganic granule component is selected from a natural stone such as silica rock, olivine, feldspar, pyroxene, granite, etc., and materials such as ceramic, glass, metal, etc. A natural or artificial fine component such as calcium carbonate, aluminum hydroxide, etc., may be cited as the fine granule component. A thermosetting acrylic resin, methacrylic resin, an unsaturated polyester resin, an epoxy resin, etc., can be used as the resin component.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antibacterial artificial stone and a method for producing the same. More specifically, the present invention provides a lightweight, high-hardness, high-strength, high-density artificial skin having excellent texture such as granite or marble and antibacterial properties as well as excellent properties such as good surface hardness and surface wear resistance. It is related to stone and its production method, as wall materials, floor materials, bathrooms, toilets, kitchens, building materials for other uses, furniture, doors, window frames, tables, countertops, handrails, stone pillars, etc. It provides a useful antibacterial artificial stone.

[0002]

2. Description of the Related Art It has been known that a natural stone is crushed into an appropriate size, mixed with calcium carbonate or the like and a resin, and then hardened to form an artificial stone. With regard to such artificial stones, efforts have been made to realize a solid granite or marble surface with transparency and depth by improving the composition and manufacturing method.

[0003] On the other hand, along with such attempts to improve,
Studies are also being made to improve the functions of artificial stone. However, in the case of most conventional artificial stones, the surface has a solid depth such as marble, and there is also a sense of transparency, and it is realized as an artificial stone with sufficient strength, hardness and durability as a stone material Not been. Also,
Improving the function is also an issue for the future. Above all, antibacterial artificial stone has been regarded as important as a building material for houses and public facilities in recent years, but it has not yet been realized.

[0004] Under such circumstances, the inventors of the present application have found that the composition and physical properties of the artificial stone are essentially different from those of the conventional artificial stone, and the color tone and physical properties of the artificial stone are also new due to the extremely small amount of resin. Stone has been developed. Therefore,
The inventors of the present application have further studied to impart antibacterial properties to this artificial stone as a new function and provide a useful artificial stone as a building material for housing building materials, housing equipment, public facilities, and the like. .

According to the invention of the present application, the artificial stone as a product has a fine structure, is transparent and deep, has an excellent color tone such as marble, and has good moldability. It is an object of the present invention to provide an antibacterial artificial stone that can be widely used in public facilities such as housing, hospitals, welfare facilities, and the like.

[0006]

Means for Solving the Problems The invention of the present application aims at solving the above-mentioned problems.
The sum of the inorganic fine-grained component of 0 mesh size and the inorganic fine-grained component of 100 mesh under is 85% by weight of the whole product
As described above, the composition of the high-density artificial stone containing the resin component of less than 15% by weight of the total amount is added to the composition of 0.5 to 5.0 of the total amount.
Provided is an antibacterial artificial stone characterized by being formed by blending with an antibacterial agent by weight.

[0007] Secondly, the invention of this application provides an antibacterial artificial stone obtained by laminating and integrating the high-density artificial stone composition on the back surface of the antibacterial artificial stone molded body. Third, the invention of this application provides an antibacterial artificial stone obtained by laminating and integrating the antibacterial agent-dispersed resin layer and the high-density artificial stone composition. The invention of this application also provides a method of manufacturing each of the artificial stones.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below. First, regarding the antibacterial artificial stone of the present invention, the following categories are basically considered. 1) High-density artificial stone composition This composition is composed of a 10-70 mesh inorganic fine-grained component and 1
The sum with the inorganic fine particle component of 00 mesh under is 85% by weight or more of the total amount, and the resin component is less than 15% by weight.

2) Antimicrobial agent 3) Antimicrobial agent-dispersed resin layer First, the composition of 1) high-density artificial stone will be described. Raw materials constituting this composition are roughly classified into three components. One is an inorganic fine-grained component having a size of 10 to 70 mesh as a main component, which is a mineral such as quartzite, olivine, feldspar, pyroxene, mica, and a natural stone such as granite and metamorphic rock. Appropriate inorganic fine-grained components from ceramics, glass, metal and the like are used.

[0010] When obtaining artificial stone, what kind of color and design are important matters.
Granite and marble are often targeted because of the difficulty in obtaining natural products and the beautiful color and luster. in this case,
Its color and luster are important themes that determine the value of granite and marble. In natural granite and marble, there are many types of colors from black to white or red, and even the same color has different degrees.

Conventionally, when giving color to various artificial stones, for example, to obtain a black stone, it is sufficient to use only a black powder of natural stones or the like, but to obtain an intermediate color stone,
Reproducibility is a problem. Also, it was difficult to give the unique luster of marble even when given a color. For example, even when a color is given using a dye or a pigment, it has conventionally been difficult to give gloss and depth.

On the other hand, in the present invention, a transparent fine component can be used. For example, when obtaining a glossy material such as granite or marble, fine granules obtained by pulverizing quartz-based natural stone can be used as the fine granule component. Fine particles obtained by grinding quartz-based natural stone have a unique smooth surface because the raw material is quartz-based. They are often colorless and transparent.
They are not very strong when they have colors, and they often have some transparency even when they are not transparent.

By using this raw material, the color of the product obtained can be controlled, and the color can be given depth and gloss due to the presence of the transparent quartz fine particles.
In addition, a fine particle component of 100 mesh under is used together with the fine particle component. Examples of the fine particle component include various natural or artificial fine particle components. For example, calcium carbonate, water, aluminum oxide, etc. are easily obtained fine particles.

Further, as a part of the fine particle component, components such as manganese dioxide, titanium dioxide, zirconium silicate, and iron oxide for adjusting the color tone, and aluminate for imparting the function of luminous and fluorescent properties. A luminous material such as strontium or an inorganic fluorescent material of various oxides may be blended, or a component such as antimony trioxide, a boron compound or a bromine compound for imparting flame retardancy may be added and blended.

The third component is a resin component. The resin component can be selected from a wide range of thermosetting ones. For example, acrylic resin, methacrylic resin, unsaturated polyester resin, epoxy resin and the like are exemplified.
Among them, methacrylic resin, epoxy resin, or a mixture thereof, or a copolymer resin thereof is shown as a preferable one.

The resin component may contain an azo or phthalocyanine organic pigment or dye for adjusting the color tone. Fine-grained components such as natural stones function as major factors in the appearance and physical properties of the resulting artificial stone. In particular, by exposing a part thereof, it becomes a main factor of the appearance color and pattern in combination with other components.

The fine-grained component is considerably finer than the fine-grained component at a level of more than 100 meshes, and is positioned so as to penetrate between the individual grains of the fine-grained component and fill the space between the grains. It contributes to obtaining the properties of the artificial stone, such as hardness and suppleness. It is preferable that the weight ratio of the fine component to the fine component is 0.5: 1 to 5: 1.

In addition, the resin component is a component for forming fine particles such as natural stone, which is a component forming the above-mentioned skeleton, and fine particles.
It has a function of wrapping these and contributing to the whole and giving elasticity or tensile strength to the product when the artificial stone is completed. In the present invention, the composition ratio of these components is important. Particularly important is the composition ratio between the resin component and other components. One of the features of the present invention is that it enables a high-density product having a dense structure.Here, the high density means that the fine-grained component and the fine-grained component contained in the artificial stone product are included. Means that they are present at a high density, which is beyond the range contained in conventional artificial stones, for example, a density of 2.2 g / cm ³ or more.

That is, as the composition ratio of fine-grained components such as natural stones as a skeleton component in a product increases, the composition becomes closer to natural stones. However, when the composition ratio is too large, the composition does not solidify and cannot be used as a product. Also, the physical properties of the resulting product are poor, making it unsuitable for use in normal usage. Further, in addition to inconveniences such as not hardening even when a large amount of fine particles are used, the resulting material is dull and hard to be called stone.

Therefore, the proportion of the fine component or the fine component used is limited. That is, the weight ratio must be 85% or more, and preferably 90% or more. In addition, 95%
If it exceeds, the product becomes brittle, and only those which are difficult to use can be obtained. On the other hand, if it is less than 85%, the product is too soft to obtain stone-like properties, and the range of use is the same as that of the resin plate.

This means that the components other than the fine and fine components such as natural stones, that is, the resin component, must not be present in the product at most 15% by weight. If the resin component exceeds about 15%, the product becomes plastic, and the artificial stone is no longer just an apparent name. On the other hand, excessively reducing the amount of the resin component may increase the appearance of the product close to the natural color, but makes the product brittle and unsuitable for use. From such a viewpoint, more preferably, the resin component is 1 to 10% by weight.
So that

In the artificial stone composition and the artificial stone as a product according to the present invention, a part or all of the above-mentioned inorganic fine-grained component is a transparent particle, and the particle or small lump is previously made of an inorganic material. Alternatively, it may be coated with an organic substance. Such coating of the transparent fine-grained component can be performed by coating and curing a resin on the surface of the transparent fine-grained component, or by baking and coating an inorganic substance such as water glass or a glaze for ceramics. Is achieved. In any case, the particle surface of the transparent fine-grain component can be coated with a coating of several μm to several tens μm, for example, about 5 to 50 μm, and more preferably about 20 to 30 μm. More specifically, for example, using an acrylic resin, an unsaturated polyester resin composition,
The resin composition is coated and cured on the surface of the fine component particles by heating to about 300 ° C. or light irradiation, or 800 to 11 using water glass, glaze or the like.
The inorganic coating can be applied by baking at a high temperature of about 00 ° C.

The color of the product can be controlled by the color of the coating layer of the fine particle component and the color tone of the resin component, and the color can be given depth and gloss by the presence of the transparent quartz fine particle component. it can. For example, if the coating layer has a baked layer of water glass containing a white pigment, or if it has a cured layer of a polyester-based unsaturated resin, and if a polyester-based unsaturated resin is used as a resin component, the resin has Since the color is generally white with a slightly yellow tint, the resulting product will be shiny milky white, giving a product with a color very similar to natural milky white marble.

When the coating layer contains a coloring material such as a pigment or a dye, a unique color tone having a depth and gloss can be provided. In the present invention, it is also possible to give a color to a product by mixing and using a granular colored component having substantially the same size as a fine component as a color component. In any case, color reproducibility can be secured much more easily than conventional artificial stones, and there is no discoloration, and a product excellent in depth and gloss can be obtained.

In the artificial stone of the present invention, a glaze for coloring ceramics or the like is applied to a powder of a natural transparent fine-grained component, which is baked to obtain a powder of a desired color. It is also particularly effective to use it as a grain component. With this method, not only can the color be assured, but also the color can be selected widely. Using the same thing that is used as a fine-grain component, which is obtained by crushing quartz-based natural stone, and applying glaze to it and using it, if it is a color such as black or red, color reproducibility There is no need to worry, the colors that are reproduced are not only the colors themselves, but also the luster and colors.

These coatings greatly improve the affinity of the fine-grained component, which functions as an aggregate of artificial stone, for the whole tissue. Also, by mixing the fine particle component and the resin component,
High strength and good surface hardness. More importantly, since the fine-grained component uses the above-mentioned transparent natural stone and the like, and the surface is coated with the hard coating,
Polishing the surface of the artificial stone product partially breaks this coating layer. Then, the surface structure of the partially exposed particles of the inorganic transparent fine particle component and the surrounding coating layer has a unique effect on light reflection.

That is, light enters the transparent fine-grained component,
The light is reflected by the surrounding coating layer, and passes through the transparent fine-grain component again to be reflected. Such light transmission and reflection phenomena are essentially different from the reflection only on the surface of the conventional artificial stone, and give the artificial stone product of the present invention a unique depth feeling. Obtain solid, high-quality marble-like artificial stone.

The transparent fine-grain component having the coating layer as described above can be generally used in a proportion of 10 to 100%, based on the total amount of the inorganic fine-grain component to be incorporated in the composition. In the present invention, it is necessary that the size of the inorganic fine particle component is also specified. That is, the inorganic fine particle component has a size of 10 to 70 mesh as described above. Except for special cases, it is preferable to use only the same size. When you want to add color to the top or bottom using colored and uncolored ones,
It is conceivable to change the size of the fine particles depending on the presence or absence of color. However, although there is an extreme difference, use in large quantities should not be used because the strength of the product is deteriorated.

On the other hand, the particle size of the fine component is set to 100 mesh under as described above. It must be able to penetrate between the particles of the fine component. Therefore, those having a size close to the particle size of the fine component are not preferred, and more specifically, those having a size of about 150 to 250 mesh are preferred. Furthermore, what is important in high-density artificial stone is
Except for special cases, it is desirable that these material compositions be uniform in any part.

For balance with the color tone, a short fiber component may be blended to reinforce the structure. For example, glass fiber, ceramic fiber, metal fiber, resin fiber, and the like can be used. Especially, glass fiber is illustrated as a preferable thing. These short fibers are generally
Those having a diameter of 10 to 100 μm and a length of about 1 to 10 mm are used in a proportion of about 1 to 10% by weight of the fine grain component.

Next, an essential component of the present invention is 2) an antibacterial agent. As the antibacterial agent, an inorganic one is preferably used as an artificial stone component. For example, silver, a silver alloy, silver oxide, or an inorganic material that can exist as silver ions is exemplified as a suitable material. Silver, a silver alloy, silver oxide, or an inorganic substance that can be present as silver ions, can be present as a powder or supported on any carrier such as silica, alumina, zeolite, and magnesia so that silver ions can be present. It may be something.

Further, other inorganic antibacterial agents and non-degradable organic antibacterial agents may be used in combination with the above silver and the like. In the present invention, the antibacterial agent is added to the high-density artificial stone composition as a composition of the antibacterial artificial stone; the antibacterial agent is dispersed and mixed into the resin, and the resin layer of the mixture is mixed with the high-density artificial stone. And laminating and integrating the stone composition (molded body). Hereinafter, each of these aspects will be described. <A> Blending of antibacterial agent to high-density artificial stone composition The blending of the antibacterial agent is performed at a ratio of 0.5 to 5.0% by weight of the total amount including the high-density artificial stone composition. More preferably, it is 1.0 to 2.5% by weight.

When the amount is less than 0.5% by weight, the antibacterial property is not always sufficient, and a stable effect is hardly obtained. on the other hand,
Even if it exceeds 5.0% by weight, the effect cannot be expected to increase much. In addition, when the amount is too large, the basic physical performance and color tone of the artificial stone are impaired, which is not preferable. When a carrier-supported antibacterial agent is used, the above ratio is considered as the amount of the active ingredient.

The molding can be performed in various modes, and is performed by casting, compression molding, etc. into various shapes such as a plate-like body and a cylindrical body. For example, in compression molding, a material (mixed material) in which fine particles, fine particles and a resin component are previously mixed and kneaded in necessary amounts in a composition after completion of molding is put into an under mold as a horizontal mold. The upper mold is combined and pressed with a surface pressure of 5 to 100 kgf / cm ² to perform compression molding. In this molding, during compression, heating is performed at a temperature of approximately 90 to 140 ° C. for approximately 5 to 20 minutes.

In the compression molding with heating, vibration can be applied to the mold together with pressure to improve the fluidity of the mixed material in the mold. Such a compression molding method is effective in mass production as a molding method having a relatively simple shape such as a flat molded article, and is excellent in economical efficiency because there is almost no loss of material.

In the present invention, the surface of the compact after molding may be processed so that the fine-grained component is exposed on the surface. As a method for this, first, a method for selectively removing a resin component is employed. That is, for example, after the mold is released from the mold, it is effective to blow the high-pressure water onto the surface of the molded article to perform the background processing.

This processing is not limited because it varies depending on various conditions such as the thickness, the distance from the nozzle, the processing form and the like. However, usually, when the thickness is 2 to 20 cm, 2 to 10 c
50-800 kg / cm from a nozzle height of about m
It can be about ² water pressure. This pressure is a lower water pressure condition than when natural stone is targeted.

That is, the presence of the resin makes it possible to more easily perform high-quality processing. There is no particular limitation on the nozzle and system for jetting high-pressure water. Various things are adopted. By this ground surface processing, flattening or roughening by a water jet is realized, and an artificial stone having a deep texture is manufactured.

Due to the presence of the resin component, the surface does not become cloudy, and the treatment of the waste liquid becomes easier as compared with the etching method using a chemical. Of course, if necessary, the surface portion can be treated with an organic solvent to soften or melt the resin component to partially remove the resin component. The organic solvent in this case may be selected according to the resin component used, for example, ethylene chloride, methylene chloride, halogenated hydrocarbons such as chloroform, acetic anhydride,
Carboxylic acids such as ethyl acetate and butyl acetate and ester compounds thereof, or acetone, tetrahydrofuran, DM
F, DMSO and the like are exemplified.

The molded body is immersed in these organic solvents or
Or spray or flow down these organic solvents,
Surface irregularities can be formed by removing the softened or molten resin component from the surface. Alternatively, the unevenness may be formed by scraping a resin component having low hardness from the surface with a wire brush, cutting means, or the like.

After the surface is roughened by the above-described various means and the background is processed, the surface is polished as described above to partially break the coating layer of the fine-grained component on the surface, and this coating layer is finely ground. The particles of the particle component are exposed on the surface of the product as a cross section. This achieves a unique depth and glossy surface texture. This is due to the unique reflection phenomenon of light.

The means for polishing the surface is not particularly limited, and it can be carried out using a tool such as a grindstone, a polishing cloth, a polishing belt, or using a polishing agent such as a buffing abrasive or a rubbing compound. . As abrasives, diamond, boron carbide, corundum, mainly polishing action,
Alumina, zirconia, tripoli, dolomite, alumina, chromium oxide, cerium oxide, etc., whose polishing action is mainly used, are appropriately used.

Of course, after such polishing,
The surface may be further roughened to form irregularities. However, also in this case, as described above, at least some of the fine component particles and the cross section of the coating layer are exposed. By doing so, an artificial stone having excellent texture and texture as well as antibacterial properties can be produced.

As for the blending of the antibacterial agent into the high-density artificial stone composition, as the first invention, it may be formed into a plate-like body having a predetermined shape and thickness after the blending, or may be relatively thin. For example, after forming into a plate-like body having a thickness of about 3 to 5 mm, an artificial stone layer consisting only of the composition of the high-density artificial stone described above may be laminated and integrated as a backing. This constitutes the second invention of this application.

This laminated integral molding is performed by the same compression molding as described above, and after the molding is completed, the surface of the antibacterial agent-added layer is subjected to roughening, mirror polishing and the like as appropriate by the same method as described above. Can be applied. <B> Lamination and integration of antibacterial agent-dispersed resin layer Separately from the blending of the antibacterial agent into the composition of the high-density artificial stone of the above <A>, on the surface of the molded article of the high-density artificial stone without adding and blending the antibacterial agent, An antibacterial artificial stone product may be constituted by laminating and integrating a resin layer containing an antibacterial agent.

In this case, the following two methods are roughly considered. That is, first of all, for example, FIG.
As described above, the surface of the molded body (1) constituted by the composition of the high-density artificial stone is roughened by a method such as the water jet (or may be roughened after polishing), and then The roughened surface (2) is coated with a resin emulsion or wax in which an antibacterial agent is dispersed, and is adhered and cured by using an anchor effect of fixing the roughened surface to a concave portion. There is a method of integrating the resin layer (3).

In this method, it is desired to select the resin or wax so that the resin layer (3) after curing has a high transparency and a large adhesive force. For example, for this purpose, the materials that make up the emulsion or wax include:
Acrylic resins, epoxy resins and the like are shown as typical examples.

From the viewpoint of affinity with these resin components, not only the above-mentioned inorganic type but also organic type antibacterial agents are used. It is usually desirable that the mixing ratio of the antibacterial agent to the emulsion or wax is about 1 to 20% by weight of the resin amount. More preferably, it is 5 to 10%. If it is less than 1%, sufficient antibacterial properties cannot be obtained, and if it is too much, the effect cannot be expected to increase. The resin content in the emulsion or wax varies depending on the coating method,
Usually, it can be about 20 to 70% by weight of the total amount.

The thickness of the cured resin layer (3) is preferably, for example, about 0.5 to 3 mm on average.
If the thickness is less than 0.5 mm, there is a problem of abrasion, and its activity and durability are not always sufficient in antibacterial properties.
If the thickness is too large, a problem of delamination may occur. The application may be performed by various methods, and may be application by a roller or a brush, application by flowing or spraying, application by dropping, or immersion.

As a second method, for example, FIG.
As exemplified in the above, a resin layer (4) in which an antibacterial agent is dispersed and mixed in a portion corresponding to a surface layer is formed in a semi-cured or cured state, and then a high-density artificial stone composition containing no antibacterial agent ( 5) may be charged to perform lamination and integral molding. After molding, surface roughening or polishing is appropriately performed.

In this method, the resin layer is formed of a monomer such as an unsaturated polyester resin, an epoxy resin or a methacrylic resin in an amount of 5 to 2 parts with respect to the total monomer weight.
It can be formed by about 0% by weight of an antibacterial agent, 0.7 to 2.0% by weight of a peroxide-based curing agent, and, if necessary, a solvent. The thickness of the resin layer (4) can be, for example, usually up to about 5 mm. According to this method, an antibacterial artificial stone molding having high adhesion strength and excellent durability can be obtained.

In any of the above <A> and <B>,
In order to improve the strength of the antibacterial artificial stone of the present invention and to configure it as a thinner product, a fiber material or a mesh body may be combined or backed with these. For these fiber materials and mesh bodies, a carbon material may be used in view of an electromagnetic wave shielding effect, or metal or waste such as blast furnace slag may be used.

[0053]

Embodiments will be described below. Of course, the present invention is not limited by the following embodiments. (Example 1) A natural silica stone having a particle size of 10 to 25 mesh was used as a fine particle component, and an aluminum hydroxide having an average particle size of 230 mesh was used as a fine particle component. The mortar was prepared by uniformly mixing 9% by weight of a polymethyl methacrylic resin monomer, 1% by weight of a curing agent, and 1.5% by weight of silver powder.

This composition was put into a mold, and the thickness was about 10%.
mm into a plate-like body. Next, the surface portion was polished using a corundum abrasive. As a result, a partial cross section of the fine grain component was exposed. The resulting artificial stone had a deep, marble-like milky white color and luster, had no air bubbles inside or on the surface, and had a uniform composition.

In a test according to Japanese Industrial Standard JIS K-7112, the specific gravity was 2.29. The water absorption is
0.13%. The other characteristics were as shown in Table 1 below. Also, a 3% hydrochloric acid aqueous solution was immersed for 8 hours,
No abnormality was observed in the acid resistance and alkali resistance tests by immersion in a 8% aqueous sodium hydroxide solution for 8 hours.

[0056]

[Table 1]

When the obtained product was used as a wall plate of a building, a beautiful marble wall having a deep depth could be obtained. When an antibacterial test was performed on this product, excellent antibacterial performance was obtained as in Sample 1 in Table 2 shown in Test Examples described later. (Example 2) In Example 1, the sum of the fine component and the fine component was 93%, and the resin component was 6%.

High quality artificial stone was obtained in the same manner as in Example 1. Compressive strength 1386 kg / cm ² , hardness 102
It had a characteristic of 6 kgf / mm ² and had a marble-like deep and excellent surface. Also, the antibacterial performance was excellent as in Sample 2 in Table 2. (Example 3) In Example 1, 15% of the total amount of natural silica as a fine-grained component was used whose surface was baked with a 25 µm-thick blue glaze.

A plate-like body was formed in the same manner as in Example 1 by using the fine-grained component having a size of 10 to 50 mesh. Next, a surface roughening treatment was performed using a water jet.
A deep, beautiful blue-white surface was obtained. Physical properties were substantially the same as those in Example 1, and a high-quality artificial stone product was realized as a building material. The antibacterial performance was also excellent as in Sample 3 in Table 2. (Example 4) Cobalt blue (Pig. 6) was used for 65% of the total amount of 10 to 50 mesh natural silica as a fine particle component.
Blue 28) A polymethyl methacrylic resin mixed with a pigment was coated to a thickness of about 50 μm and cured.

Molding was carried out in the same manner as in Example 3, and thereafter the surface was roughened. A deep and beautiful surface with a mixture of blue and milky white was obtained. This artificial stone product has a specific gravity of 2.30, a bending strength of 30.45 kgf / cm, and a compressive strength of 1306 kg.
f / cm ² and hardness 951 kgf / mm ² . The antibacterial performance was also excellent as in Sample 4 in Table 2. (Example 5) In Example 1, instead of silver powder, zeolite carrying silver ions was used as an antibacterial agent. When molded and polished in the same manner, an artificial stone having excellent color tone and physical properties was obtained.
It was an excellent one. (Example 6) Natural silica stone having a particle diameter of 10 to 30 mesh and calcium carbonate having an average particle diameter of 180 mesh were made to be 90% by weight of the total weight at a weight ratio of 2.2: 1, and 9% by weight. Of polymethyl methacrylic resin monomer and 1
% By weight of a peroxide-based curing agent was uniformly mixed, charged into a mold, and compression-molded to obtain a plate having a thickness of 15 mm.

This was surface-roughened by a water jet. Next, 10% by weight of silver powder based on the amount of the resin was dispersed in an acrylic resin emulsion having a concentration of 45%.
It was applied and cured at a rate of m ² . Next, the surface was polished.

The color tone and physical properties of the obtained artificial stone were good, and the antibacterial performance was excellent as shown in Sample 6 in Table 2. (Example 7) In Example 6, the surface was roughened by a water jet without polishing the surface. The antibacterial property of this was also good as in Sample 7 in Table 2. (Test Example) Samples 1 to 7 of the above Examples 1 to 7 (50 × 50
mm), 0.5 ml of a suspension of the bacterium prepared with a Ringer solution (using a Ringer tablet manufactured by Merck) was added dropwise to the solution.
Stored at 5 ° C. for 24 hours.

Thereafter, the sample surface was washed out with a sterilized phosphate buffer. The number of surviving bacteria in the washed-out liquid was measured by a pour plate method using an agar medium for measuring the number of bacteria. As a control, a test using only the bacterial solution (blank) was also performed at the same time. The above results are shown in Table 2 below.

[0064]

[Table 2]

[0065]

As described above, the present invention provides an antibacterial high-density artificial stone having an excellent depth, gloss, excellent color, and good characteristics which could not be obtained conventionally. The obtained product is suitable for obtaining granite-like or marble-like products, and can be used similarly to natural stones.

The product can be used as a wall material, a floor material, a pillar and the like as a deep luxury product more widely than a natural product. And, most importantly, the invention provides an antibacterial artificial stone. In hospitals, geriatric welfare centers, houses, etc., various materials such as tables, handrails, window frames, doors, toilets, kitchens, baths, furniture, etc. and countertops, floors, walls, pillars, etc. The artificial stone which can suppress generation | occurrence | production of a stone will be provided.

[Brief description of the drawings]

FIG. 1 is a process cross-sectional view illustrating a method for manufacturing an artificial stone in which an antimicrobial agent-dispersed resin layer is laminated and integrated.

FIG. 2 is a process sectional view illustrating a manufacturing method different from that of FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 molded article 2 rough surface 3, 4 antibacterial agent dispersed resin layer 5 artificial stone composition containing no antibacterial agent

Claims (12)

[Claims] 1. The sum of an inorganic fine particle component having a size of 10 to 70 mesh and an inorganic fine particle component having a size of 100 mesh or less is 85% by weight or more and contains a resin component of less than 15% by weight of the total amount. An antibacterial artificial stone, characterized in that the composition of the high-density artificial stone is mixed with an antibacterial agent in an amount of 0.5 to 5.0% by weight based on the total amount and is molded. 2. The antibacterial artificial stone according to claim 1, wherein the antibacterial agent is contained in an amount of 1.0 to 2.5% by weight. 3. The antibacterial artificial stone according to claim 1, wherein the antibacterial agent is an inorganic agent. 4. The antibacterial artificial stone according to claim 1, wherein the antibacterial agent is silver, a silver alloy, silver oxide, or an inorganic agent that can be present as silver ions. 5. The fine component and the fine component in a weight ratio of 0.
The antibacterial artificial stone according to claim 1, which is blended at a ratio of 5: 1 to 5: 1. 6. The antibacterial artificial stone according to claim 1, wherein the proportion of the resin component is 1 to 10% by weight. 7. An antibacterial artificial stone characterized in that the inorganic fine-grained component has an inorganic layer or an organic layer previously coated and cured on a part or all of its surface. 8. The cured coating layer on the surface has a thickness of 5 to 50 μm.
The antibacterial artificial stone according to claim 7, which is: 9. An antibacterial artificial stone, wherein the back surface of the artificial stone molded product according to any one of claims 1 to 8 is laminated and integrated with a high-density artificial stone composition. 10. The sum of an inorganic fine particle component having a size of 10 to 70 mesh and an inorganic fine particle component having a size of 100 mesh or less is 85% by weight or more, and less than 15% by weight of the total amount is a resin component. An antibacterial artificial stone, characterized in that a resin layer in which an antibacterial agent is dispersed is laminated and integrated on the surface of a high-density artificial stone. 11. The method for manufacturing artificial stone according to claim 10, wherein the surface of the high-density artificial stone is roughened, and then a resin emulsion or wax in which an antibacterial agent is dispersed is applied and cured to laminate and integrate. A method for producing an antibacterial artificial stone, comprising: 12. The method for producing an artificial stone according to claim 10, wherein a high-density artificial stone composition is integrally molded with the antibacterial agent-dispersed resin layer.