KR102720786B1 - Functional ceramic coating agents and their coating methods - Google Patents

Abstract

The present invention relates to a method for manufacturing a functional ceramic coating agent and a coating method using the same, wherein the method comprises mixing manganese dioxide (MnO ₂ ) or the like, which improves the bonding strength of a silicate mineral and a coating, to realize a coating agent that emits far infrared rays beneficial to the human body and has anti-fungal and anti-bacterial effects, and wherein the coating surface has a hardness of Mohs' hardness of 5 or higher, so that it has excellent wear resistance, while limiting the emission of carbon from an object to be coated, thereby enabling a coating layer to be formed uniformly, and thus has functionality such as heat resistance, wear resistance, solvent resistance, discoloration resistance, non-stickiness, and non-flammability. The silicate mineral of the present invention is collected, crushed, and finely divided into about 1000 meshes, and used as the main component of a coating composition. At this time, each mineral can be used independently, but it is preferable to use two to three types of minerals as a mixture.
A functional ceramic coating composition is manufactured by mixing various crushed minerals with a ceramic binder as a binding agent and mixing auxiliary materials to improve adhesion and bonding properties. The manufactured composition is completely removed from the surface through sandblasting, and is completed through a process such as spraying or dipping on the surface of a metal plate, metal pipe, etc. that has been surface-treated, and then through a heat treatment (sintering) process. If the coating target is iron, an annealing process must be performed before performing the above process to remove impurities contained in the iron. The heating temperature during the annealing process is approximately 750 to 850°C, and the appropriate time is 10 to 30 minutes. The coating target, on which a coating film has been formed using the functional ceramic coating agent through spraying or dipping, undergoes a heat treatment (sintering) process. The appropriate heat treatment (sintering) time at this time is approximately 5 to 20 minutes. After the heat treatment and cooling, a coating with a beautiful surface and functionality is completed. At this time, during the heat treatment (sintering) process, the bonding strength between the two materials is increased by the ionization reaction (ionizing) between the ceramic powder and the base material, so it exhibits the characteristic of having high resistance to interface destruction.

Description

Functional ceramic coating agents and their coating methods

The present invention relates to a functional ceramic coating agent and a coating method thereof, and more specifically, to a functional ceramic coating agent and a coating method thereof, which can be realized by mixing a silicate mineral obtainable from nature with manganese dioxide (MnO ₂ ) or the like which improves the bonding strength of the coating, thereby emitting far infrared rays beneficial to the human body and having antifungal and antibacterial effects, and in which the coating surface has a hardness of Mohs' hardness of 5 or higher, thereby exhibiting excellent wear resistance and limiting the release of carbon from the coating target object, thereby enabling the coating layer to be formed uniformly, and which can be manufactured by mixing the coating material at room temperature without sintering it at high temperature.

The existing ceramic coatings only have a simple surface protection function, and there was a problem that they were easily cracked or peeled off due to external impact, etc. Representative examples of the existing ceramic coatings include enamel coatings and ceramic paints, and this problem of the existing coating agent or paint is that the bonding strength between the coating agent and the coating object is reduced even when the existing ceramic coating agent or ceramic paint is completely fixed to the surface of the coating object. The existing patent No. 10-1703345, “Method for producing a ceramic coating composition, coating composition thereof, and coating method using the same,” discloses a ceramic coating composition that does not require high-temperature sintering (firing), but the coating agent is manufactured by mixing each material such as silica, feldspar, and sodium, sintering them through a sintering process, and then crushing them. Therefore, heat treatment is required at a temperature of 1,000 to 1,600℃ for a minimum of 1 hour and a maximum of 10 hours for sintering each material, which has the disadvantage of requiring a lot of energy costs, and also imparting functionality using a catalyst, etc.

Existing patents disclose methods of manufacturing the main raw material of an existing ceramic coating agent by manufacturing a basic mixture of the coating agent through pretreatment such as sintering, and then mixing other ingredients with a solvent such as ethanol to manufacture a coating agent, or manufacturing a coating agent by mixing and forming a composition with silver nano ingredients to impart functionality, or coating by directly attaching the mixture to the coating target and heat treatment (sintering), etc. The above existing ceramic coatings have only a simple surface protection function, and have the problem that they are easily cracked or peeled off due to external impact, etc.

KR 10-1703345 “Method for producing ceramic coating composition, coating composition and coating method using the same” KR 10-1416508 “Functional coating agent using composite ceramics, method for manufacturing the coating agent, and product coated with the coating agent”

The purpose of the present invention is to provide a functional coating agent that solves the problems of the above paint by mixing each material constituting the paint as is and using it after physical treatment, thereby eliminating the need for a sintering process and saving energy required for a sintering process.

The purpose of the present invention is to solve the problems of the above-mentioned existing ceramic coating agent, and the present invention was invented to solve the problems of the existing ceramic coating agent or ceramic paint and to realize a superior bonding force with a surface such as a metal and a beautiful coating surface, and since each material constituting the paint is mixed as it is and used through physical treatment, there is no process such as sintering, so that energy required for the sintering process can be saved, and as a coating agent that improves and supplements the problems of the above-mentioned existing ceramic paint, the coating composition is an environmentally friendly coating agent that does not contain any environmentally destructive substances, and has complex functions such as antibacterial and antifungal functions, deodorizing functions, and far-infrared radiation, thereby enhancing the bonding force between the coating material and the metal surface and providing a coating agent and a coating method therefor with improved durability that does not cause cracks or peeling.

The above object of the present invention is achieved by the functional ceramic coating agent according to the present invention, which is manufactured by crushing the silicate mineral into a particle size of about 900 to 1100 mesh as a main raw material, having a composition of 5 to 15 wt%, adding a ceramic binder as a binding agent thereto to prepare a basic coating composition, mixing sodium nitrite as an additive to improve the surface adhesion of the coating composition and an object to be coated, further adding manganese dioxide to improve the binding force, adding water to complete the mixture as a coating agent, and crushing and mixing the mixture in a ball mill for 24 hours or more.

The ceramic binder used in the present invention has a composition of 42.5 to 48.7 wt% silica, 7.65 to 8.38 wt% iron oxide, 7.35 to 7.85 wt% calcium oxide, 1.54 to 1.72 wt% potassium oxide, 9.45 to 9.82 wt% boron oxide, 11.8 to 12.7 wt% alumina, 0.05 to 0.15 wt% magnesium oxide, 12.2 to 13.1 wt% sodium oxide, and 1.26 to 2.88 wt% fluorine.

The above object of the present invention is achieved by a coating method of a functional ceramic coating agent according to the present invention, which comprises the steps of: selecting a coating object coated by the spray or dipping method according to the purpose of coating at a temperature of 40 to 50°C for about 25 to 35 minutes; performing heat treatment (sintering) in a heat treatment furnace; and performing heat treatment at a temperature of 750 to 920°C for about 5 to 20 minutes; and taking the object out of the heat treatment furnace and cooling it to room temperature.

The functional ceramic coating agent of the present invention and the coating method thereof have the characteristics of far-infrared radiation and surface protection, and among them, far-infrared rays are light with a wavelength between near-infrared rays and microwaves, and have the characteristic of penetrating the human skin to a depth of about 40 mm and generating heat by resonating with molecules constituting human cells and promoting molecular movement, thereby having beneficial functions for the human body, such as a thermal effect.

In particular, the functional ceramic coating agent of the present invention is an excellent material that radiates 90.7% in a wavelength range of 5 to 20 μm at 40°C, which is a wavelength range beneficial to the human body, and exhibits a radiation energy of 3.66×10 ² W/m ² , and when heated, the far-infrared radiation function is further enhanced, radiating 82.6% in a wavelength range of 3 to 20 μm at 500°C, and exhibits an energy of 1.41×10 ⁴ W/m ² , and such far-infrared radiation plays a beneficial role in the human body as described above.

In addition, since the coating material coated with the composition of the functional ceramic coating agent of the present invention and heat-treated has a surface hardness of Mohs' hardness of 5 or higher and excellent chemical resistance, it can be expected to have the effect of protecting the surface of the equipment as well as protecting the equipment from chemicals. In particular, when the coating is applied to the inner and outer surfaces of equipment installed in a workplace with a lot of contamination, the lifespan of the equipment can be extended due to functions such as wear resistance and chemical resistance, so that the replacement period can be extended, and cost savings can also be expected accordingly. In addition, due to the radiation of far-infrared rays, when applied to equipment in the environmental field in particular, effects such as prevention of decay and odor removal can also be expected. In addition, since the functional ceramic coating composition is composed of inorganic substances, it is also a pollution-free coating agent that does not generate volatile organic compounds (VOCs (Volatile Organic Contaminants)) that are harmful to the human body from the coating agent. In addition, since the coating surface coated with the above functional ceramic coating agent does not react with salt water, if the coating is applied to equipment installed in a place where salt damage is expected, rust will not form on the coating surface, so it can be expected to have the effect of strengthening the durability of the equipment and extending the replacement cycle.

Figure 1 shows a processing flow diagram for implementing the present invention.

The functional ceramic coating agent according to the present invention is manufactured by crushing silicate minerals into a particle size of about 900 to 1100 mesh as a main raw material, adding a ceramic binder as a binding agent thereto to prepare a basic coating composition, mixing an additive to improve the surface adhesion of the coating composition and an object to be coated, additionally adding manganese dioxide, and adding water to complete the composition as a coating agent, followed by a crushing and mixing process in a ball mill for 24 hours or more.

The above silicate mineral is manufactured by mixing 10 to 25 wt%, ceramic binder 69 to 72 wt%, sodium nitrite as an additive 1 to 5 wt%, manganese dioxide 5 to 10 wt%, and the remainder water.

The above silicate mineral has a composition containing 10.50 to 16.50 wt% of SiO ₂ , 7.32 to 12.20 wt% of Al ₂ O ₃ , 8.05 to 12.50 wt% of MgO, 6.80 to 13.50 wt% of Fe ₂ O ₃ , and 0.95 to 1.65 wt% of Ti. In addition, the composition also contains 0.0035 to 0.0058 wt% of Y, 0.0075 to 0.0117 wt% of La, and 0.005 to 0.009 wt% of Nd, which are known as rare earth elements.

The silicate mineral applied to the present invention is composed of oxygen (O) and silicon (Si), which are the most abundant elements in the earth's crust. Most silicate minerals are solid solutions and have extremely complex compositions in nature due to substitution of metal cations (Al ³⁺ , Fe ³⁺ , Ca ²⁺ , Mg ²⁺ , Fe ²⁺ , Na ⁺ , K ⁺ ) in octahedral plates and substitution of anions such as OH ^- and F ^- .

Broadly speaking, the mineral structure varies depending on the substitution state of Si ions within the silicate tetrahedron, whether it is a hydrated or anhydrous mineral (whether OH ^- is included in the structure), and the relationship between iron and magnesium (if both are divalent cations, the ion sizes are similar).

Therefore, even though they are the same silicate minerals, they are classified into numerous types based on their various compositions and the resulting differences in layer charge. Silicate minerals can be broadly classified into six types.

The types are: 1. Layered silicate: SiO ₄ tetrahedrons share three oxygen atoms to create a plate-like layered structure, and most of them are hydrous minerals with hydroxyl groups (OH) in the structure. Depending on the arrangement of the tetrahedral and octahedral plates, they are classified into 1:1 layered type (TO structure) and 2:1 layered type (TOT structure). Representative minerals include illite, chlorite, muscovite, and biotite.

2. Network silicate: SiO ₄ tetrahedra share both the neighboring tetrahedra and their vertex oxygen atoms to form a complex three-dimensional stereoscopic structure. The ratio of silicon to oxygen is 1:2, and if both silicon and oxygen are connected, the charge is theoretically neutral, so cations can no longer be substituted, and it becomes quartz with the chemical formula SiO ₂ . However, in nature, it is common for cations to be substituted into the structure, and representative minerals of this structure include orthoclase, feldspar, and zeolite.

3. Ring silicates: Three, four, or six SiO ₄ tetrahedra share the oxygen atoms at the vertices and form a ring shape. The ratio of silicon to oxygen is 1:3 in all cases. Hexagonal silicate minerals are mainly found on the surface of the earth, while trigonal and square silicate minerals are very rare. Representative minerals include beryl, cordierite, and tourmaline.

4. Reticulated silicate: Two chains of SiO ₄ tetrahedra are bonded in parallel, and each chain shares one oxygen atom with the other chain at one interval. The ratio of silicon to oxygen is 4:11. Representative minerals include pyroxene and hornblende.

5. Independent tetrahedral silicate: SiO ₄ tetrahedra are made up of independent silicate ions that do not share oxygen atoms at the vertices, and the ratio of silicon to oxygen is 1:4. Representative minerals include olivine, garnet, andalusite, zircon, topaz, and garnet.

6. Coplanar silicates: SiO ₄ tetrahedra share oxygen atoms at the vertices and form a finite group, with a silicon to oxygen ratio of 2:7. Examples include feldspar, chrysotile, and jasper.

Among the above six types of silicate minerals, in the present invention, all types of silicate minerals from 1 to 6 are collected, crushed, and made into powder, and used as the main material of the coating composition. At this time, the powder particle size of the minerals is processed into fine powder of 1000 mesh or more, and each mineral can be used independently, but preferably, 2 to 3 types of minerals can be mixed and used.

The reason why the above silicate mineral is set at 10 to 25 wt% is that it is difficult to exhibit sufficient functionality at less than 10 wt%, and a problem occurs in the adhesion of the coating agent at 25 wt% or more, so the above silicate mineral is set at 10 to 25 wt%.

A functional ceramic coating composition is manufactured by mixing various crushed silicate minerals with a binder and mixing auxiliary materials to improve adhesion.

The above-mentioned binding agent, the binder, is an inorganic material composed of 42.5 to 48.7 wt% of silica, 7.65 to 8.38 wt% of iron oxide, 7.35 to 7.85 wt% of calcium oxide, 1.54 to 1.72 wt% of potassium oxide, 9.45 to 9.82 wt% of boron oxide, 11.8 to 12.7 wt% of alumina, 0.05 to 0.15 wt% of magnesium oxide, 12.2 to 13.1 wt% of sodium oxide, and 1.26 to 2.88 wt% of fluorine.

The reason why the above additive, sodium nitrite, is set to 1 to 5 wt% is that if it is less than 1 wt%, the adhesion of the coating is significantly reduced, and if it is more than 5 wt%, the effect relative to the weight is minimal.

The reason why the manganese dioxide content is set to 5 to 10 wt% is that if it is less than 5 wt%, the bonding strength of the coating decreases, and if it is more than 10 wt%, the functionality does not increase much relative to the content, so it is difficult to expect an improvement in functionality relative to the amount added, and so the component ratio is set.

The functional ceramic coating composition manufactured in this manner is subjected to surface treatment such as sandblasting to remove foreign substances on the surface, and then the remaining foreign substances such as oil on the surface are removed with heavy ash (sodium carbonate _{, Na2CO3} ), and then the composition is coated on the surface of a metal plate or the inside and outside of a metal pipe to provide functionality.

The coating method can be selected from spraying or dipping depending on the coating purpose.

The coating target object coated by spraying or dipping is dried at 40 to 50°C for about 30 minutes, and then heat treated (fired) in a heat treatment furnace. The heat treatment (fired) temperature is characterized by being 750 to 920°C, and the heat treatment is performed for about 5 to 20 minutes, and then taken out of the heat treatment furnace and cooled to complete the coating.

This heat treatment process helps to improve the adhesion of the coating layer and durability such as wear resistance by forming an ionized bond between the coating agent and the coating target.

The functional ceramic coating agent according to the present invention and the coating method using the same, more specifically, are a method for manufacturing a coating agent by coating the surface of iron and stainless steel or a non-ferrous metal, such as copper, brass, bronze, etc. with a functional ceramic coating agent to impart functionality such as heat resistance, wear resistance, solvent resistance, discoloration resistance, and non-flammability, and a method for coating the surface of iron and non-ferrous metal using the manufactured functional coating agent to obtain a functional coating surface having heat resistance, wear resistance, chemical resistance, weather resistance, solvent resistance, discoloration resistance, non-stick properties, and non-flammability.

Due to the role of the silicate mineral powder included in the above functional ceramic coating agent, it is an excellent material that radiates 90.7% in the wavelength range of 5 to 20 μm at 40°C, which is a wavelength range beneficial to the human body, and exhibits a radiation energy of 3.66×10 ² W/m ² . In addition, when heated, the far-infrared radiation function is further enhanced, and 90.7% is radiated in the wavelength range of 3 to 20 μm at 500°C, and the energy exhibits 1.41×10 ⁴ W/m ² .

These far-infrared rays can be emitted to have excellent functions such as antibacterial and antifungal properties and deodorizing, and far-infrared rays are light with a wavelength between near-infrared rays and microwaves, and can penetrate about 40 mm into the skin of the human body, and have the characteristic of resonating with molecules that make up human cells and promoting molecular movement to generate heat on their own, so the effect of thermal therapy can be expected, and the thermal effect of far-infrared rays also has the advantage of being able to greatly help maintain the health of the human body, and when combined with various environmental devices, it relates to a method for manufacturing a functional ceramic coating agent that has the effects of deodorizing and preventing decay, and a coating method for coating iron, stainless steel or non-ferrous metals using the manufactured coating agent.

The functional ceramic coating agent and coating method of the present invention improve upon existing ceramic coating agents to expand the scope of application limited to existing kitchenware, etc., and thereby coat not only kitchenware used in daily life but also equipment made of metal, thereby improving mechanical functions such as chemical resistance, corrosion resistance, weather resistance, and scratch resistance, thereby extending the replacement time, thereby reducing costs and contributing to saving resources.

By utilizing the far-infrared ray radiation function, which is a characteristic of the functional ceramic coating agent of the present invention, a product beneficial to health can be produced.

The functional ceramic coating agent of the present invention is composed of a silicate mineral as its main raw material, and the remainder is composed of additives that enable more perfect coating, and the binder that acts as a binder melts at a high temperature to bind the functional ceramic coating composition and enables good adhesion to the coating surface to be coated, and manganese dioxide is added to the coating agent composed of silicate minerals to enhance the functionality of the coating agent. The remaining additives serve to improve the bonding of the coating agent and the surface of the coating object. The coating agent manufactured in this way forms a coating layer on the surface of the metal preheated to 50 to 60°C by spraying or dipping on the sandblasted coating object - in the case of iron, after annealing. The metal on which the coating layer has been formed is heat-treated at a temperature of 750 to 920°C in a heating furnace to be completed. The functional ceramic coating agent of the present invention forms a coating layer with a thickness of about 80 to 250 μm on the surface of the metal to protect the surface of the coating object and impart the above functionality, and also has the effect of beautifully processing the surface of the coating object.

Hereinafter, the manufacturing method and coating method of the functional ceramic coating agent according to the present invention will be described in detail. First, the functional ceramic coating agent according to the present invention is basically prepared by crushing silicate minerals that are expected to have the highest functionality, preferably by pulverizing them to a size of 900 to 1100 mesh, preferably about 1000 mesh.

The functional ceramic coating agent of the present invention is produced by mixing finely divided silicate minerals, a binder such as a ceramic binder, and additives with water at an appropriate ratio, and the mixing ratio is preferably 1:1 or 2:1.

The functional ceramic coating agent of the present invention has functions such as antibacterial and antifungal properties. At this time, the coating composition produced is put into a ball mill together with auxiliary materials such as a binder that can improve the adhesion of the coating, and mixed and ground for 18 to 32 hours to complete the functional ceramic coating composition.

At this time, the auxiliary materials mixed together with the main raw material, silicate mineral powder, for improving the adhesion of the coating, coating surface, and functionality include 69 to 72 wt% of a binder that acts as a binder, 5 to 10 wt% of manganese dioxide that improves bonding strength, and 1 to 5 wt% of sodium nitrite, an additive that improves the adhesion of the coating, are mixed with the main raw material, silicate mineral, to complete a functional ceramic coating. The binder, which is a binding agent, is composed of 42.5 to 48.7 wt% of silica, 7.65 to 8.38 wt% of iron oxide, 7.35 to 7.85 wt% of calcium oxide, 1.54 to 1.72 wt% of potassium oxide, 9.45 to 9.82 wt% of boron oxide, 11.8 to 12.7 wt% of alumina, 0.05 to 0.15 wt% of magnesium oxide, 12.2 to 13.1 wt% of sodium oxide, and 1.26 to 2.88 wt% of fluorine.

A coating method of a functional ceramic coating composition manufactured as described above is disclosed as follows.

First, if the coating target is metal, a pretreatment process is required.

In particular, when describing the case of iron, there are impurities mixed inside iron, so if it is coated as is and heat treated, there is a risk that the impurities inside will come out and contaminate the coating surface. Therefore, a pretreatment process is absolutely necessary before performing the coating.

The pretreatment process requires pretreatment (annealing) of the coating target at 750~820℃ for 10~30 minutes to remove impurities. The coating target from which the impurities have been removed - the following process is the same as the coating process for metals other than iron - is cooled and sandblasted using emery sand, and heavy ash (sodium carbonate, _{Na2CO3 )} is diluted in water and sprayed to remove impurities such as oil that may remain on the surface. The heavy ash sprayed at this time is prepared by diluting powdered heavy ash in water. The appropriate amount of heavy ash diluted in water is 5~15 wt%.

When the diluted spray liquid dries on the surface of the coating target, coating is performed by spraying or immersion. Before coating, the coating target is preheated to 50~60℃ and then coating is performed. Preheating the coating target is to heat it for rapid drying of the coating agent containing water as the main component. The coating thickness applied at this time is preferably 80~250㎛.

When the coating layer is formed, heat treatment (firing) is performed after complete drying. Drying is performed using hot air, and the temperature of the hot air is preferably about 50 to 60℃. When the coating surface is completely dry, the heat treatment (firing) process is performed. The temperature of the heat treatment (firing) of the coating target is 750 to 920℃. At this time, the heat treatment (firing) time is about 5 to 20 minutes, and the coated target is taken out of the heat treatment furnace and cooled to complete.

The coating agent and the coating target, after heat treatment, form an ionizing bond, which improves the adhesion of the coating layer and helps to improve durability such as wear resistance. It also increases the bonding strength between the two materials, resulting in high resistance to interface destruction.

The excellence of the functional ceramic coating agent of the present invention can be understood through examples, experimental examples and comparative examples manufactured by the method for manufacturing a functional ceramic coating agent having such a composition.

[Example 1]

This is the result of a comparative test of the far-infrared emissivity of a metal specimen coated with the functional ceramic coating agent of the present invention with a coating agent containing 5 wt% and 10 wt% of silicate minerals.

As can be seen from the above examples, it can be seen that the content of silicate minerals plays a decisive role in imparting functionality to the functional ceramic coating agent of the present invention.

In the examples, it was found that silicate minerals had a great influence on the functionality of the functional ceramic coating agent of the present invention. Based on the examples above, the functionality of the functional ceramic coating agent of the present invention was proven through analysis as shown in the following Test Examples 1 to 5, which are both functional and environmentally friendly.

[Experimental Example 1]

This is the result of testing the antibacterial properties of a metal surface coated with the functional ceramic coating agent of the present invention.

※ Strain used: Escherichia coli ATCC 8739

Pseudomonas aeruginosa ATCC 15442

Staphylococcus aureus ATCC 6538P

In the above test results, the number of each strain decreased after 24 hours, showing a reduction rate of 99.9%.

[Experimental Example 2]

This is the result of testing the antifungal properties of a metal surface coated with the functional ceramic coating agent of the present invention.

※ Mold strains (mixed strains)

Aspergillus nigar ATCC 9642

Penicillium pinophilum ATCC 11797

Chaetomium globosum ATCC 6205

Gliocladium virens ATCC 9645

Aureobasidium pullulans ATCC 15233

In the above test results, no mycelial growth was detected at all when each fungal strain was inoculated.

[Experimental Example 3]

This is the result of testing the far-infrared emissivity of a metal surface coated with the functional ceramic coating agent of the present invention.

The results of the above test are experimental data on emissivity and radiation energy in the wavelength range of 5 to 20㎛, which is the most beneficial wavelength range for our body. The test results show that the wavelength range and radiation energy are large.

[Experimental Example 4]

These are the results of accelerated weather resistance and salt spray tests on a metal surface coated with the functional ceramic coating agent of the present invention.

The above test was conducted with respect to the durability of the coating, showing the durability of the air corrosiveness and the salt spray test promoting corrosion, and both showed no abnormal results.

[Experimental Example 5]

These are the results of accelerated weather resistance and salt spray tests on a metal surface coated with the functional ceramic coating agent of the present invention.

The above test is the result of a test related to the chemical resistance and eco-friendliness of the coating of the present invention. There was no abnormality in both acid resistance and alkali resistance, and it can be seen that the coating hardly emits VOCs and formaldehyde, which are environmental pollutants harmful to our bodies.

Comparative Example 1

A method for manufacturing a ceramic coating composition, a coating composition and a coating method using the same, registered in Korean Patent No. 1703345, disclose a pure inorganic coating agent to which no organic binder is added. Although this comparative patent is a coating agent composed only of inorganic substances, the compositions for manufacturing the coating agent are mixed, sintered at a temperature of 1,000 to 1,600°C for 1 to 10 hours, and the sintered compositions are pulverized and used as a coating agent. Therefore, a lot of energy cost is added to the sintering treatment of each material, and although it is said that high-temperature heat treatment is not performed, since heat treatment is performed at 600 to 1,000°C with a high-frequency induction heating device, no significant advantage in terms of cost can be found compared to heat treatment in a conventional heating furnace.

Comparative Example 2

Korean Patent No. 1416508, “Functional coating agent using composite ceramics and method for manufacturing the coating agent and product coated with the coating agent” discloses a method of manufacturing a coating agent by gradually heating a material used for the coating at 200 to 1400°C and sintering it, and using the pulverized sintered material as a main raw material. In this patent, the main raw material is manufactured through sintering, and the pulverized raw material is dispersed in a solvent to complete the coating agent. Therefore, since the materials used for the coating agent are completed through sintering, the energy cost required for sintering is considerably high, and the process is complicated because the coating film is formed in upper, middle, and lower stages. In addition, although TEOS (tetraethoxysilane) used in the sol-gel method is used in the manufacturing process to provide functions such as water repellency, the hardness of the coating film is relatively low, which has the disadvantage of low durability.

The coating target object coated with the functional ceramic coating composition in this way can produce a coating result having an excellent quality with a beautiful surface, high surface hardness, and resistance to wear (wear resistance, weather resistance), and resistance to various acids or alkalis (acid resistance, alkali resistance: chemical resistance). In addition, due to the far-infrared ray emission, which is a feature of the functional ceramic composition, when coated on an article used in daily life, an article that is very beneficial to the human body can be manufactured due to the far-infrared ray emission. In addition, when the functional ceramic coating of the present invention is coated on equipment, etc., the durability of the equipment can be increased due to the increase in surface strength and functionality, such as the wear resistance, chemical resistance, and weather resistance, and thus the replacement cycle of the equipment can be extended, and a reduction in the replacement cost can be expected accordingly.

The functional ceramic coating agent and the coating method according to the present invention are inventions having industrial applicability, since it is possible to repeatedly manufacture the same product and perform the same method repeatedly in the coating agent manufacturing industry.

Claims (4)

In functional ceramic coatings,
The functional ceramic coating agent is characterized in that it contains 69 to 72 wt% of a binder acting as a binder, 10 to 25 wt% of a silicate mineral, 5 to 10 wt% of manganese dioxide improving the bonding strength of the coating, and 1 to 5 wt% of sodium nitrite as an additive improving the adhesion of the coating.
In paragraph 1,
A functional ceramic coating agent characterized in that the functional ceramic coating agent is produced by mixing with water in a ratio of 1:1 to 2:1.
In a functional ceramic coating method using the functional ceramic coating agent of Article 1,
The above functional ceramic coating method comprises a surface treatment step of sandblasting the surface of a coating object before coating with a coating agent comprising 69 to 72 wt% of a binder acting as a binder, 10 to 25 wt% of a silicate mineral, 5 to 10 wt% of manganese dioxide improving the bonding strength of the coating, and 1 to 5 wt% of sodium nitrite as an additive improving the adhesion of the coating.
A surface pretreatment step in which heavy ash (sodium carbonate, Na2CO3) is diluted in water and sprayed onto the surface with a spray gun to remove impurities including oil remaining on the surface after sandblasting.
When the sprayed sodium carbonate dries, a step of forming a coating layer on the surface of the coating target by spraying or immersing the coating agent;
A functional ceramic coating method characterized by including a step of completely drying the formed coating layer by heating the surface-pretreated target object to 50 to 60°C.
In the third paragraph,
A coating method characterized by including a heat treatment step of heating an object to be coated with the coating agent to 50 to 60°C, completely drying the formed coating layer, and then heat-treating (firing) the object at 750 to 920°C, and cooling to room temperature.