KR101841970B1 - Method for producing ceramic composition for coating, ceramic composition by the method and coating mehtod using by it - Google Patents

Abstract

The present invention relates to a method for manufacturing an antibacterial ceramic coating composition, the coating composition, and a coating method using the same. The method for manufacturing the antibacterial ceramic coating composition comprises: a step of mixing 10-30 wt% of corundum, 5-25 wt% of a silica stone, 1-15 wt% of tin oxide, 5-30 wt% of borax, 1-18 wt% of a base stone, 1-20 wt% of copper oxide, 0.1-5 wt% of magnesium carbonate, 0.1-5 wt% of cobalt oxide, and 0.1-5 wt% of manganese dioxide; a step of melting the mixed composition at the temperature of 1,200-1,600°C to produce an amorphous sintered body; a step of cooling the produced amorphous sintered body; a step of pulverizing the cooling product; a step of coating the pulverized product on a surface of a metal base material; a step of sintering the metal base material, on which the composition is coated, at the temperature of 800-950°C for 1-30 minutes; and a step of cooling the sintered metal base material. The present invention can form a ceramic thin film having excellent antibiosis, heat insulation, and heat resistance on the surface of the metal base material without using an organic binder or a high-temperature sintering process. The present invention can form the ceramic thin film having excellent self-cleaning ability by emitting far-infrared rays and providing excellent deodorizing power.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method for preparing an antimicrobial ceramic coating composition, a coating composition for the same, and a coating method using the same.

The present invention relates to a method for producing an antimicrobial ceramic coating composition, a coating composition for the antimicrobial ceramic coating composition, and a coating method using the same. More specifically, the present invention relates to a ceramic coating composition having excellent antimicrobial activity without requiring high- To a method of coating a base material.

BACKGROUND ART In general, various kinds of coating agents for coating surfaces are used for various industrial products in order to improve the protection and functionality of products.

The most popular coating method is coating of organic material, but it has low heat resistance, time after formation of coating film, deterioration, decolorization and peeling due to sunlight and daylight. , Continuous maintenance and management were required to protect the base material.

In order to cope with such a problem, ceramic coating agents have recently been attracting attention from the viewpoints of high heat resistance, aesthetic appearance and human-friendly properties.

Ceramic coating agents that have been used so far include organic ceramic coating agents using organic binders such as silane, acryl silicate, and silicone fluorine polymer compounds and inorganic ceramic coating agents using only inorganic ceramics without using organic binders.

However, the organic ceramic coating agent is easy to apply, but a large amount of various volatile organic compounds (VOCs) are generated due to the used organic binders, thereby causing adverse effects on the environment.

The inorganic ceramic coating agent does not cause environmental pollution. However, in order to fix the inorganic ceramic coating layer to the base material, the inorganic ceramic coating agent must be sintered for a long time through a sintering furnace maintained at 1,100 to 1,700 ° C. There is a disadvantage in that a great heat treatment cost is incurred due to high-temperature sintering.

In order to overcome such disadvantages, Korean Patent No. 10-1703345 discloses a ceramic coating composition obtained by melting a ceramic composition composed of silica, feldspar, sodium, boron, cryolite, titanium dioxide, aluminum oxide, manganese, nickel, , Coating it on the base material, and then heat-treating it at a temperature of 800 to 950 ° C to form a film.

The above-mentioned prior-art patent has a disadvantage in that the heat treatment cost is reduced by heat treatment at a relatively low temperature, but it lacks functionalities such as antibacterial and deodorization.

KR 10-1493951 B1 KR 10-1703345 B1

Accordingly, it is an object of the present invention to provide a ceramic coating composition having an amorphous structure which does not require high-temperature sintering while having an antibacterial and deodorizing effect.

Further, by coating the surface of the metal base material using such a ceramic coating composition, it is possible to manufacture a metal base material having a ceramic coating layer that radiates a large amount of far-infrared rays and is excellent in heat insulation, heat resistance and self-correcting ability.

In order to accomplish the above object, the present invention provides a method for producing an antimicrobial ceramic coating composition, which comprises 10 to 30 wt% of corundum, 5 to 25 wt% of silica stone, 1 to 15 wt% of tin oxide (SnO ₂ ) By weight of boron, 5 to 30% by weight of borax, 1 to 18% by weight of niter, 1 to 20% by weight of copper oxide (CuO), 0.1 to 5% by weight of magnesium carbonate (MgCO ₃ ) ) comprising the steps of: 0.1-5 wt.%, manganese dioxide (MnO ₂₎ cooling step and the amorphous sintered body thus prepared for producing an amorphous sintered body by treating the melt-step and the mixture was mixed for 0.1 to 5% by weight, And pulverizing the cooled cooling product.

The melting treatment is performed at 1,200 to 1,600 DEG C for 1 to 10 hours.

The ceramic coating composition according to the present invention is characterized in that it is produced through the above-described method.

The coating method according to the present invention includes the steps of: applying the ceramic coating composition to a surface of a metal base material; firing the metal base material coated with the composition at a temperature of 800 to 950 ° C for 1 to 30 minutes; And cooling the heat-treated metal base material.

The step of applying the coating composition to the surface of the metal base material may include coating the coating composition to a thickness of 10 to 2,000 mu m and then applying the coating composition to the base metal material, Drying at a temperature of < RTI ID = 0.0 > 200 C, < / RTI >

Wherein the metal base material is a pipe, and the step of performing the sintering treatment is characterized by heating with a high frequency induction heating device and performing heat treatment.

The firing step is characterized by firing in a box furnace.

According to the present invention, there is an advantage that a ceramic thin film having excellent antimicrobial property, heat insulating property and heat resistance can be formed on the surface of a metal base material without using an organic binder or a high-temperature sintering process. In addition, it radiates far-infrared rays and is excellent in deodorizing power, which makes it possible to form a ceramic thin film having excellent self-cleaning ability.

In addition, it is advantageous in that the manufacturing cost is remarkably reduced because the work is simple and the production efficiency is excellent.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process flow diagram for manufacturing a ceramic coating composition according to the present invention; FIG.
2 is a process diagram of a ceramic coating method according to the present invention.

Hereinafter, the present invention will be described in detail.

First, a method of manufacturing a ceramic coating composition according to the present invention will be described.

Conventional ceramic coating compositions require the use of organic binders or high temperature sintering in the coating process. In addition, a conventional composition having a low-temperature sintering process at 1100 DEG C or less lacked additional functionality.

The ceramic coating composition according to the present invention is characterized by being capable of low-temperature sintering, having excellent antimicrobial and deodorizing ability, radiating far-infrared rays, having excellent self-cleaning ability, and excellent in heat resistance and heat insulation .

The method for preparing the ceramic coating composition of the present invention comprises 10 to 30% by weight of corundum, 5 to 25% by weight of silica stone, 1 to 15% by weight of tin oxide (SnO ₂ ) 5 to 30% by weight of cobalt oxide, 1 to 18% by weight of niter, 1 to 20% by weight of copper oxide (CuO), 0.1 to 5% by weight of magnesium carbonate (MgCO ₃ ) A step of mixing 0.1 to 5% by weight of manganese dioxide (MnO ₂ ); melting and mixing the mixture to prepare an amorphous sintered body; cooling the produced amorphous sintered body; The method comprising the steps of:

Hereinafter, a method for producing the antibacterial ceramic coating composition according to the present invention will be described in detail with reference to FIG.

Coarse (Corundum) 30 wt% , Silica stone 5 ~ 25 wt% , Tin oxide ( SnO ₂ ) 1 to 15% by weight, borax (borax) 30 wt% , Niter 1 ~ 18 wt% , Copper oxide ( CuO ) Between 1 and 20 % , Magnesium carbonate ( MgCO ₃ ) 0.1 ~ 5 wt% , Cobalt oxide ( CoO ) 0.1 ~ 5 wt% , Manganese dioxide (MnO ₂ ) 0.1 to 5% by weight.

First, it is mixed with a coarse, grit, tin oxide, borax, corundum, copper oxide, magnesium carbonate, cobalt oxide and manganese dioxide. At this time, the above-mentioned components are used to form a coating layer having excellent self-cleaning ability by imparting functions of deodorization, far-infrared radiation, and antibacterial action of the ceramic thin film through these components, and also to improve heat insulation and heat resistance. In addition, the thermal expansion coefficient of the composition is similar to that of a metal, especially iron or stainless steel, so that the coating layer, that is, the ceramic thin film has excellent physical properties, but does not cause peeling and has excellent adhesion.

More specifically, the coarse grit enhances the hardness and strength of the coating layer, enhances heat resistance and heat insulation, and radiates a large amount of far-infrared rays to assist in antibacterial and deodorization. The silica improves the strength and physical properties of the coating layer, It also contributes to the improvement of corrosion resistance and acid resistance. The tin oxide improves the heat resistance and wear resistance of the coating layer, and the borax improves the adhesion of the coating layer and improves the compositional integrity. The cornerstone improves the physical properties of the coating layer and prevents the coating layer from being uneven It plays a role. Further, the copper oxide adjusts thermal expansion, gives stability to a rapid thermal shock, exhibits a great resistance to physical impact, and the magnesium carbonate remarkably improves the heat insulation and heat resistance. The cobalt oxide and manganese dioxide radiate far- It helps to antimicrobial activity and improves the overall physical properties of the coating layer.

The mixing ratio is 10 to 30% by weight of corundum, 5 to 25% by weight of zircon, 1 to 15% by weight of tin oxide, 5 to 30% by weight of borax, 1 to 18% by weight of cornerstone, 1 to 20% by weight of copper oxide, It is preferable to mix 0.1 to 5% by weight of magnesium, 0.1 to 5% by weight of cobalt oxide and 0.1 to 5% by weight of manganese dioxide. This is because the antimicrobial activity, deodorizing power, far infrared ray emissivity, melting temperature, Etc. When the mixing ratio is exceeded, the characteristics described above are lowered. Therefore, the mixing ratio is mixed as described above.

On the other hand, the above-mentioned coating composition has an advantage that natural oak color is expressed due to the strong oak. Thus, there is no need to include a separate pigment. However, it is of course also possible to further include components known in the field to which the present technique belongs for improving the physical properties of the pigment-containing coating composition.

The particle size of each material used in the mixture is not limited.

And melting the mixed mixture to produce an amorphous sintered body.

Next, the mixed mixture is melt-treated to produce an amorphous sintered body. In this case, the melting treatment means sintering at a temperature of 1,200 to 1,600 ° C. for 1 to 10 hours. When the melting temperature is low, sintering is difficult. When the melting temperature is higher than 1600 ° C., .

In the present invention, since the amorphous ceramic coating composition is prepared by sintering the mixture, it is possible to form a ceramic coating having excellent strength, abrasion resistance, adhesion, surface hardness and corrosion resistance even when a high temperature sintering process of not less than 1,100 ° C. is not performed .

Cooling the produced amorphous sintered body.

Then, the produced amorphous sintered body is cooled. The cooling may be performed by a dry method such as leaving at room temperature, using cold air or passing through a cooling roller, or employing a wet cooling method in which water is added to cool the material. Do not.

Since the method of cooling the sintered body is well known in the field of the technology, detailed description thereof will be omitted. The sintered body may be cooled to such an extent that the sintered body can be pulverized. The sintered body is usually about 20 to 50 캜, but is not limited thereto.

The heating rate and cooling rate at the time of the melting treatment and cooling are not particularly limited and the temperature can be raised or cooled while the temperature or the cooling rate is kept constant and the temperature can be increased or decreased while varying gradually or discontinuously There is no restriction on the implementation.

The cooled Cooling water  Crushing step.

And the cooled cooling product is pulverized. The pulverization can also be carried out by dry milling and used as a powder coating composition. Alternatively, the cooling product may be pulverized, that is, wet milled with water to be used as a liquid coating composition, or may be wet pulverized and then cooled again, And may be used as a coating composition on a powder, and its implementation is not limited.

Also, the grain size is not limited to a large extent, but may be about 1 to 300 mu m.

As described above, the antimicrobial ceramic coating composition according to the present invention has a high emissivity of far-infrared rays, excellent antimicrobial and deodorizing power, excellent adhesion to a base material, and excellent corrosion resistance and surface hardness. In addition, since it is an amorphous structure, it is characterized in that these characteristics are exhibited even when a high temperature sintering process is not included in coating. Further, such a ceramic coating is also characterized in that it is superior in heat insulation and heat resistance to other ceramic coating compositions.

Hereinafter, a method of coating a metal base material using the coating composition of the present invention will be described in detail with reference to FIG.

The coating method according to the present invention comprises the steps of: applying the composition to the surface of a metal base material; firing the metal base material coated with the composition at a temperature of 800 to 950 DEG C for 1 to 30 minutes; And cooling the metal base material.

The ceramic coating composition described above was mixed with a metal Of base metal  Applying to the surface.

First, the above-mentioned ceramic coating composition is applied to the surface of the metal base material. As described above, the ceramic coating composition may be in a powder state or in a liquid state, and the kind thereof is irrelevant.

As the base material, various kinds of metal materials can be used, but in particular, a base material of a material including iron or stainless steel can be used. This is because the high-frequency induction heating apparatus or the box furnace is used in the heat treatment step to be described later, so that it is easier to heat when a material including iron or stainless steel is used.

In addition, the present invention can be applied to various types of metal base materials. In particular, the present invention is characterized in that pipes which are difficult to apply the conventional ceramic coating can also be used. In other words, a pipe requiring high corrosion resistance and high acid resistance is required to use a thick stainless steel material as it is in a circular shape. However, most of the pipes are unlikely to be used due to high cost of materials, and corrosion resistance and acid resistance are remarkably deteriorated when iron materials are used. According to the present invention, it is possible to produce a low-cost ceramic pipe because it can secure high corrosion resistance and acid resistance by coating the composition of the present invention while reducing the thickness of stainless steel as well as iron. It goes without saying that various types of metal base materials other than pipes can be used.

If the thickness of the coating layer is less than 10 mu m, it is difficult to secure sufficient physical properties. If the thickness of the coating layer is more than 2,000 mu m, This is because the cost increases without increasing the physical properties of the product, which is not efficient. The thickness of the coating layer can be controlled according to the number of coatings, the coating method, and the like.

As the coating method, various methods known in the art can be applied. Examples of the coating method include a dip coating method, a powder coating method, a spray coating method, a brushing method, a spray coating method (thermal spraying) may be used. That is, it can be appropriately selected according to the type and the shape of the base material and the thickness of the required coating layer, and the spray coating or the thermal spraying is most preferably used.

When the coating composition is applied to the metal base material To  Drying step.

Next, the metal base material to which the coating composition is applied is dried. The drying may be performed in a drying chamber at a temperature of 30 to 200 DEG C, and the drying time is not limited. That is, the drying is performed until the coating layer is sufficiently dried, and the drying time varies depending on the drying temperature, but is usually about 5 minutes to 1 hour.

However, when the ceramic composition is applied using the powdery coating composition, the drying step may be omitted.

The dried metal Base material  And calcining at a temperature of 800 to 950 DEG C for 1 to 30 minutes.

Then, the dried metal base material is calcined at a temperature of 800 to 950 DEG C for 1 to 30 minutes.

At this time, a high frequency induction heating apparatus or a box furnace is used as the firing treatment.

Here, the high-frequency induction heating apparatus refers to a device that places a conductor serving as an object to be heated in a coil and causes an eddy current to be generated near the surface of the metal conductor when a high-frequency current is passed therethrough, And the dried metal base material is subjected to heat treatment as an object to be heated. Such a high frequency induction heating apparatus is useful when the metal base material is a pipe.

In addition, the box furnace uses a heat source of electric or gas, a box type stationary furnace in which a large quantity is charged at one time and a furnace, and a tunnel type continuous furnace rotatably mounted in a jig. The size of the box is made proportional to the size of the base material, and a jig and a cart are used. At this time, the bogie can be used automatically by attaching a motor. In addition, depending on the shape of the base material, rails may be provided on the lower part of the continuous firing furnace and laid on the jig, or rails may be installed on the upper part of the firing furnace,

In addition, although the baking treatment temperature was conventionally 1,100 ° C or higher, in the present invention, even if the heat treatment is performed at a temperature of 800 to 950 ° C, a sufficient ceramic coating film is formed and the physical properties thereof are remarkably improved. At this time, the calcination treatment time may be 1 to 30 minutes.

remind Heat-treated  Metal base material To  Cooling step.

Next, the heat-treated metal base material is cooled to about room temperature through a known method to complete the coating operation.

The surface of the coated metal base material is smooth and glossy, and the adhesion between the coating layer and the metal base material is excellent. In addition, it is particularly excellent in acid resistance, strength, heat resistance and abrasion resistance.

Accordingly, there is provided a ceramic-coated metal base material which does not contain an organic binder, does not require high-temperature sintering and does not cause environmental pollution in a simple manner, and has characteristics of high quality, i.e., high acid resistance, high strength, high heat resistance and high abrasion resistance There are advantages to be able to.

On the other hand, if necessary, prior to application of the coating composition of the present invention, a pretreatment may further include steps such as sandblasting and surface polishing so as to remove foreign substances or grease from the surface of the metal base material and improve the adsorption force of the coating composition , Its implementation is not limited.

However, as described above, since the surface of the coated metal base material according to the present invention is smooth and glossy, a post-finishing operation such as a separate grinding or polishing process is unnecessary.

Further, since the present invention is excellent in adhesion and does not cause peeling of the coating layer, an acid treatment step of forming fine unevenness on the surface of the metal base material as a pretreatment is not required.

Hereinafter, the present invention will be described in more detail with reference to specific examples.

(Example 1)

A mixture of 20 wt% of copper oxide, 20 wt% of zircon, 10 wt% of tin oxide, 20 wt% of borax, 12 wt% of corner stone, 15 wt% of copper oxide, 1 wt% of magnesium carbonate, 1 wt% of cobalt oxide, A coating material was prepared. The amorphous sintered body was melted at 1400 캜 for 3 hours, cooled to room temperature and cooled to room temperature, and then milled to a size of 1 to 300 탆 by dry milling.

The dry milled composition was powder coated onto the surface of the base material. Then, it was baked in a box furnace at 900 DEG C for 10 minutes and then cooled at room temperature. The thickness of the coated film was 100 mu m.

Here, as the base material, a stainless steel 304 steel plate having a thickness of 2T and a reinforcing bar D22 specified in KS D 3504 were used.

(Comparative Example 1)

The coating material was prepared in the same manner as in Example 1 except that 25 wt% of silica, 20 wt% of feldspar, 10 wt% of sodium, 6 wt% of boron, 6 wt% of cryolite, 6 wt% of titanium dioxide, 6 wt% of manganese, and 5 wt% of nickel were mixed and used.

(Test Example 1)

The deodorizing power of Example 1 was tested. As a test specimen, a stainless steel 304 plate (10 cm x 10 cm, 2T) in which the coating layer of Example 1 was formed was used. In the test method, the specimen was sealed in a 5-L reactor, and after the test gas was injected, the concentration of the test gas was measured over time and referred to as the sample concentration. The concentration of the test gas was measured by a gas detection tube (formerly KS I 2218), and the test was carried out in the absence of a sample, which was called blank concentration. Formaldehyde (HCHO) and ammonia (NH ₃ ) were used as the test gas.

The removal rate of the test gas for each time period was calculated as follows.

(%) = [{(Blank concentration) - (sample concentration)} / (blank concentration)] × 100

The results are shown in Table 1 below.

Results of Test Example 1 Test Items Test result Test environment
Blank concentration
(μmol / mol) Sample concentration
(μmol / mol) Deodorization rate (%) Deodorization
(HCHO)
* Detection limit
0.5 mol / mol 0 minutes 20 20 0.0 (19.9 ± 0.03) ° C
(40.8 ± 0.5)% RH
30 minutes 20 18 10.0 60 minutes 20 15 25.0 90 minutes 20 13 35.0 120 minutes 20 12 40.0 Deodorization
(NH ₃₎
* Detection limit
0.2 mol / mol 0 minutes 50 50 0 30 minutes 49 25 48.9 60 minutes 49 20 59.1 90 minutes 49 18 63.2 120 minutes 49 17 65.3

As can be seen from the above Table 1, it can be confirmed that Example 1 shows excellent deodorizing power.

(Example 2)

The far infrared ray emissivity of Example 1 was tested. The test method was followed in accordance with KCL-FIR-1005; 2011 and measured by FT-IR spectrometer. As the test piece, a stainless steel 304 plate (10 cm x 10 cm, 2T) having the coating layer of Example 1 was used.

The results of Test Example 2 Test Items unit Test result Remarks Far-infrared emissivity
(Measurement temperature: 40 占 폚, measurement wavelength: 5 占 퐉 to 20 占 퐉) - 0.814 (22.4 ± 0.1) ° C
(24.2 ± 0.3)% RH
Far-infrared radiation energy
(Measurement temperature: 40 占 폚, measurement wavelength: 5 占 퐉 to 20 占 퐉) W / ㎡ 3.02 × 10 ² (22.4 ± 0.1) ° C
(24.2 ± 0.3)% RH

As can be seen from the above Table 2, Example 1 shows that the far infrared ray emissivity reaches 81% and has a high radiant energy.

(Test Example 3)

The antibacterial properties of the above Example 1 were tested. As the test piece, a stainless steel 304 steel plate (5 cm x 5 cm, 2T) in which the coating layer of Example 1 was formed was used. The antimicrobial activity was determined using Escherichia coli, a gram-negative bacterium, and Staphylococcus aureus, a gram-positive bacterium, according to the film adhesion method of Japanese Industrial Standards Z 2801 (JIS Z2801). After incubation, all specimens were cultured for (24 ± 1) hours at (35 ± 1) ℃ and relative humidity of 90% or higher. Then, the bacteria were collected from each specimen and the number of live cells was measured.

As a test method, the bacteria were cultured on a slope medium at 35 ± 1 ° C for 16-20 hours on a slope medium, and the cultured bacteria were added to 500-fold diluted Nutrient Broth (1/500 NB) ⁵ to 10 x 10 ⁵ ) / ml, and used as the inoculum. 0.4 nL of the prepared inoculum was inoculated on the test surface of each specimen placed in Petri Dish, and the inoculum was spread over the specimen by spreading the film on the inoculum. The petri dish was closed (35 ± 1) ℃, And cultured for 24 ± 1 hours under conditions of 90% or more of humidity. 10 mL of SCDLP medium was used for the 24-hour culture of the untreated test pieces immediately after the inoculation, and the bacteria were recovered from each of the test pieces and the non-processed test pieces. The collected bacteria were incubated at 35 ± 1 ℃ for 40 ~ 48 hours using PCA medium.

The results are shown in Table 3 below.

Results of Test Example 3 Test Items
Test result Initial concentration
(CFU / mL) Concentration after 24 hours
(CFU / mL) Bacterial reduction rate
(%) Escherichia coli Blank 1.7 x 10 ⁴ 5.9 x 10 ⁴ - Example 1 1.7 x 10 ⁴ <10 99.9 Staphylococcus aureus Blank 1.2 x 10 ⁴ 4.4 × 10 ⁴ - Example 1 1.2 x 10 ⁴ <10 99.9

As can be seen from the above Table 3, it was confirmed that Example 1 showed a bacterial reduction rate of 99.9% after 24 hours from the test on E. coli and Staphylococcus aureus.

(Test Example 4)

The acid resistance of Example 1 and Comparative Example 1 was tested using 68% nitric acid (HNO ₃ ), 98% sulfuric acid (H ₂ SO ₄ ), 35% hydrochloric acid (HCl) and 55% hydrofluoric acid (HF). For the acid resistance test, specimens were prepared so that the reinforcing bars formed with the coating layers of Example 1 and Comparative Example 1 had a length of 3 cm.

Test methods were as follows: Acet (one each of nitric acid, sulfuric acid, hydrochloric acid, and hydrofluoric acid) and B set (nitric acid, sulfuric acid, hydrochloric acid, and hydrochloric acid) containing two 150 ml of nitric acid, 150 ml of sulfuric acid, And one set of each one of the hydrofluoric acid). Thereafter, the specimen of Example 1 was placed in a paper cup of Aset and the specimen of Comparative Example 1 was placed in a paper cup of B set. After 24 hours, the specimen was taken out and the degree of redness A digital area meter was used to measure the corrosion area rate. At this time, the calculation of the corrosion area ratio was made as corrosion area / measurement area × 100. The temperature of each acid was maintained at 20 ° C.

As a control, reinforcing bars having no coating layer were prepared in the same size.

Test Example 4 Result division nitric acid Sulfuric acid Hydrochloric acid Foshan Example 1 0 0 0 0 Comparative Example 1 2 0 0 21 Control group 94 92 93 98

As can be seen from the above Table 4, it was confirmed that in Example 1, no reaction was found in all of nitric acid, sulfuric acid, hydrochloric acid and hydrofluoric acid. On the other hand, in Comparative Example 1, it was confirmed that there was no reaction with sulfuric acid and hydrochloric acid. However, slight corrosion occurred in nitric acid and hydrofluoric acid, and a large amount of corrosion was observed in nitric acid, sulfuric acid, hydrochloric acid and hydrofluoric acid.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. It will also be appreciated that many modifications and variations will be apparent to those skilled in the art without departing from the scope of the invention.

Claims (7)

delete 10 to 30 wt% of corundum, 5 to 25 wt% of silica stone, 1 to 15 wt% of tin oxide (SnO ₂ ), 5 to 30 wt% of borax, 1 to 18 nitrers 1 to 20% by weight of copper oxide (CuO), 0.1 to 5% by weight of magnesium carbonate (MgCO ₃ ), 0.1 to 5% by weight of cobalt oxide and 0.1 to 5% by weight of manganese dioxide (MnO ₂ ) Step,
Melting the mixed mixture at 1,200 to 1,600 DEG C for 1 to 10 hours to obtain an amorphous sintered body;
Cooling the produced amorphous sintered body,
And milling the cooled cooling product. &Lt; RTI ID = 0.0 &gt; 21. &lt; / RTI &gt;
The antimicrobial ceramic coating composition according to claim 2, which is produced by the method of claim 2.
Applying the ceramic coating composition of claim 3 to the surface of the metal base material,
Calcining the metal base material coated with the composition at a temperature of 800 to 950 占 폚 for 1 to 30 minutes;
And cooling the heat-treated metal base material. &Lt; RTI ID = 0.0 &gt; 11. &lt; / RTI &gt;
5. The method of claim 4,
Wherein the step of applying the coating composition to the surface of the metal base material comprises applying the coating composition to a thickness of 10 to 2,000 mu m,
After the step of applying the coating composition to the metal base material,
And drying the metal base material coated with the coating composition at a temperature of 30 to 200 캜, followed by heat treatment.
6. The method of claim 5,
The metal base material is a pipe,
The firing step may include:
And heating the coated substrate with a high frequency induction heating apparatus to heat-treat the coated substrate.
The method according to claim 6,
The firing step may include:
And baking the mixture in a box furnace.

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