Composition for thermal insulation coating applied to high-temperature surfaces using an inorganic binder and method for preparing the same

Abstract

The present invention relates to a composition for thermal insulation coating using an inorganic binder and a method for manufacturing the same. The inventors have completed the present invention regarding an eco-friendly thermal insulation coating composition comprising an inorganic binder and a porous ceramic pigment, which can be applied without a factory shutdown compared to conventional wrapping-type insulation materials, and is easy to apply even to equipment with complex shapes such as valves because it is manufactured in a liquid form, and a method for manufacturing the same.

Description

Technology Field

[0001] The present invention relates to a composition for thermal insulation coatings for high-temperature surface application using an inorganic binder and a method for manufacturing the same.

[0002] More specifically, the invention relates to an eco-friendly thermal insulation coating composition having excellent adhesion, thermal insulation, and durability, comprising a special inorganic binder and a porous ceramic pigment, and a method for manufacturing the same. Background Technology

[0003] The advancement of industrialization demands both the expansion of production scale and the sophistication of processes; consequently, the importance of factory expansion and equipment management is growing. In the modern manufacturing industry, production facilities function not merely as workspaces, but as core production infrastructure that combines technology, manpower, and capital.

[0004] In particular, establishing a mass production system requires the systematic design of various elements, such as process layout, equipment layout, and logistics flow, as these factors are directly linked to production efficiency. In fact, production facilities serve as the core foundation of modern manufacturing processes and play a crucial role in enabling efficient and stable production activities.

[0005] As factories expand, systematic equipment management becomes essential as the types and quantities of facilities increase and process structures become more complex. Failure to properly manage facilities can lead to various problems, such as equipment breakdowns, production stoppages, and quality degradation, which directly impact a company's productivity. In particular, as operating conditions for facilities become more sophisticated, the importance of energy management within the factory increases as well.

[0006] In the manufacturing process of electronic devices, which accounts for a significant portion of recent industrial development, various heat-generating facilities such as high-temperature equipment, piping, reactors, dryers, and boilers are utilized; therefore, minimizing heat loss is directly linked to production efficiency. In such an environment, insulation is recognized as a core technology that goes beyond merely maintaining temperature to reduce energy consumption and ensure process stability. In fact, a significant portion of heat loss in industrial processes can be effectively reduced through proper insulation design and the application of insulation materials, playing a crucial role in improving factory energy efficiency and reducing operating costs.

[0007] Furthermore, insulation holds significant importance in ensuring process stability and the safety of the working environment. High-temperature surfaces generated by industrial equipment can pose a burn risk to workers, and sustained heat release may lead to performance degradation of surrounding equipment or changes in process conditions. Applying an appropriate insulation system can effectively block this heat release, thereby lowering the external surface temperature of the equipment and enhancing the safety of the working environment.

[0008] Furthermore, insulation contributes to maintaining stable reaction efficiency and product quality by keeping process temperatures constant, serving as an important factor in enhancing the reliability of the entire industrial process.

[0009] Recently, as energy conservation and carbon emission reduction have emerged as key challenges in industrial operations, the importance of insulation technology is being further emphasized. The International Energy Agency (IEA) and various studies evaluate the reduction of heat loss in industrial processes as one of the most effective means of improving energy efficiency and reducing greenhouse gas emissions. Accordingly, the application of high-performance insulation systems is expanding in various industrial facilities, such as factory equipment, piping, storage tanks, and building structures, while insulation materials and insulation coating technologies are also continuously advancing.

[0010] Currently, insulation methods applied in industrial settings involve wrapping insulation materials around equipment. Representative insulation materials widely used include fiber-based insulation such as glass wool and mineral wool, and polymer foam insulation such as polyurethane and polystyrene. These insulation materials are primarily applied to pipes, tanks, boilers, reactors, and the exterior walls of building structures to block heat transfer and maintain process temperatures.

[0011] However, existing insulation methods have various limitations depending on the application method and material characteristics. First, in the case of fiber-based or foam insulation, insulation performance can deteriorate over time due to moisture absorption, compressive deformation, and degradation; additionally, some organic insulation materials have the problem of limited heat and fire resistance. Furthermore, since most insulation materials applied to industrial facilities require a thick structure, they are often difficult to apply to piping with limited installation space, complex equipment structures, or curved equipment. These issues act as factors that make the design and maintenance of insulation systems difficult, particularly in high-temperature processes or confined equipment environments.

[0012] Furthermore, existing insulation systems have limitations, such as complex construction processes and additional costs incurred during maintenance. Since typical insulation structures often involve applying exterior cladding after the insulation is installed, the construction phase is somewhat complex; additionally, insulation may need to be removed and reinstalled during equipment inspections or maintenance. This process can increase downtime and lead to higher maintenance costs.

[0013] Based on these results, the inventors have completed the present invention regarding an eco-friendly thermal insulation coating composition comprising an inorganic binder and a porous ceramic pigment, which can be installed without a factory shutdown compared to conventional wrapping-type insulation materials, and is easy to install even on equipment with complex shapes such as valves because it is manufactured in a liquid form, and a method for manufacturing the same. Prior art literature

[0014] Korean Registered Patent Publication No. 10-2326873 The problem to be solved

[0015] The present invention aims to provide a thermal insulation coating composition comprising an inorganic binder, a ceramic pigment, and water, wherein the inorganic binder comprises a potassium silicate salt and the ceramic pigment comprises oxide glass and aluminum oxide (Al2O3), and the thermal insulation coating composition comprises 40 to 60 wt% of the inorganic binder, 20 to 40 wt% of the ceramic pigment, and 10 to 30 wt% of water.

[0016] The present invention also provides a method for manufacturing a composition for thermal insulation coating, comprising the steps of: preparing a first binder solution by adding a potassium silicate salt to water and stirring; preparing a second binder solution by adding colloidal silica to the first binder solution over a period of 20 to 30 minutes; preparing a third binder solution by adding metakaolin to the second binder solution and stirring at 1500 to 2500 rpm; preparing a first mixed solution by adding crushed mica, wollastonite, and calcined diatomite to the third binder solution and stirring at 1800 to 3000 rpm; and preparing a second mixed solution by adding glass oxide, aluminum oxide, and expanded perlite to the first mixed solution and stirring at 200 to 500 rpm. The purpose is to provide a method for manufacturing a thermal insulation coating composition comprising: a step of preparing a third mixed solution by adding sepiolite, bentonite, and a non-halogen auxiliary agent to the second mixed solution and stirring at 200 to 500 rpm; and a step of adjusting the viscosity to 50 to 65 KU by adding water to the third mixed solution.

[0017] The present invention also aims to provide a thermal insulation coating method using the aforementioned thermal insulation coating composition, comprising the steps of: removing contaminants by sanding the surface of a body to be coated; preparing the aforementioned thermal insulation coating composition by stirring at 100 to 200 rpm; placing the thermal insulation coating composition in a spray container and spraying it onto the surface of the body to be coated until a coating film with a thickness of 1 to 2 mm is formed; drying the coating film for 20 to 40 minutes; and repeating the spraying step and the drying step 3 to 5 times.

[0018] The purposes of the present disclosure are not limited to those mentioned above, and other purposes and advantages of the present disclosure not mentioned may be understood from the following description and will be more clearly understood by the embodiments of the present disclosure. Furthermore, it will be readily apparent that the purposes and advantages of the present disclosure can be realized by the means and combinations thereof set forth in the claims. means of solving the problem

[0019] The present invention provides a composition for a thermal insulation coating comprising an inorganic binder, a ceramic pigment, and water.

[0020] The above-mentioned inorganic binder may be characterized by including a potassium silicate salt.

[0021] The above-mentioned inorganic binder may be characterized by further including colloidal silica or metakaolin.

[0022] The above potassium silicate salt may be characterized by being included in the form of an aqueous solution.

[0023] The above colloidal silica may be characterized by having a size of 10 to 50 nm.

[0024] The above colloidal silica may be characterized by being surface-modified with a silane coupling agent.

[0025] The above silane coupling agent may be characterized as being methyltrimethoxysilane (MTMS), hexamethyldisilazane (HMDS), trimethylchlorosilane (TMCS), or octyltriethoxysilane (OTES).

[0026] The above colloidal silica may be characterized by an increased porosity.

[0027] The metakaolin may be characterized by being manufactured through the steps of: preparing kaolin; grinding the kaolin to 2 to 10 μm; drying the ground kaolin at 100 to 120°C; calcining the dried kaolin at 550 to 750°C; cooling the calcined kaolin; and grinding the cooled kaolin to 1 to 5 μm.

[0028] The above metakaolin may be characterized by being surface-modified with a silane coupling agent.

[0029] The above silane coupling agent may be characterized as being methyltrimethoxysilane (MTMS), 3-aminopropyltriethoxysilane (APTES), or 3-glycidoxypropyltrimethoxysilane (GPTMS).

[0030] The ceramic pigment may be characterized by including oxide glass and aluminum oxide (Al2O3).

[0031] The ceramic pigment may be characterized by further including one or more selected from the group consisting of diatomaceous earth, kaolin, feldspar, calcite, and dolomite.

[0032] The above-mentioned oxide glass may be characterized by containing fine glass particles and hollow glass particles of different sizes.

[0033] The above fine glass particles may be characterized by having a size of 1 to 10 μm, preferably 3 to 8 μm.

[0034] The above hollow glass particles may be characterized by having a size of 10 to 100 μm, preferably 20 to 80 μm.

[0035] The above oxide glass may be characterized by comprising 50 to 75 wt% silicon dioxide (SiO2), 5 to 20 wt% sodium oxide (Na2O), 3 to 15 wt% potassium oxide (K2O), 5 to 20 wt% calcium oxide (CaO), and 0 to 10 wt% boron oxide (B2O3).

[0036] The above thermal insulation coating composition may be characterized by comprising 40 to 60 wt% of an inorganic binder, 20 to 40 wt% of a ceramic pigment, and 10 to 30 wt% of water.

[0037] The above-mentioned thermal insulation coating composition may be characterized by further including an inorganic filler.

[0038] The above inorganic filler may be characterized by comprising one or more selected from the group consisting of calcined diatomite, expanded perlite, mica, and wollastonite.

[0039] The above thermal insulation coating composition may be characterized by further including sepiolite or bentonite.

[0040] The above thermal insulation coating composition may be characterized by comprising 16-20 wt% potassium silicate, 6-10 wt% colloidal silica, 4-10 wt% metakaolin, 3-7 wt% calcined diatomite, 2.5-5.5 wt% expanded perlite, 3-7 wt% glass oxide, 9-15 wt% aluminum oxide, 6-10 wt% mica, 7-13 wt% wollastonite, 1-3 wt% sepiolite, 0.8-2.2 wt% bentonite, 14-20 wt% water, and 1.5-3.5 wt% non-halogen auxiliary agent.

[0041] The present invention also provides a method for manufacturing a composition for thermal insulation coating, comprising the steps of: preparing a first binder solution by adding a potassium silicate salt to water and stirring; preparing a second binder solution by adding colloidal silica to the first binder solution over a period of 20 to 30 minutes; preparing a third binder solution by adding metakaolin to the second binder solution and stirring at 1500 to 2500 rpm; preparing a first mixed solution by adding crushed mica, wollastonite, and calcined diatomite to the third binder solution and stirring at 1800 to 3000 rpm; and preparing a second mixed solution by adding glass oxide, aluminum oxide, and expanded perlite to the first mixed solution and stirring at 200 to 500 rpm. A method for preparing a thermal insulation coating composition is provided, comprising the steps of: preparing a third mixed solution by adding sepiolite, bentonite, and a non-halogen auxiliary agent to the second mixed solution and stirring at 200 to 500 rpm; and adjusting the viscosity to 50 to 65 KU by adding water to the third mixed solution.

[0042] The above-mentioned non-halogen auxiliary agent may be characterized by including a polycarboxylate-based dispersant or a polyphosphate-based dispersant.

[0043] The present invention also provides a thermal insulation coating method using the aforementioned thermal insulation coating composition, comprising the steps of: removing contaminants by sanding the surface of a body to be coated; preparing the aforementioned thermal insulation coating composition by stirring at 100 to 200 rpm; placing the thermal insulation coating composition in a spray container and spraying it onto the surface of the body to be coated until a coating film with a thickness of 1 to 2 mm is formed; drying the coating film for 20 to 40 minutes; and repeating the spraying step and the drying step 3 to 5 times.

[0044] The thickness of the above film may be characterized by being able to be flexibly adjusted according to the surface temperature of the coated object.

[0045] The above coating method is not limited to humidity, but preferably may be characterized by being performed at a relative humidity of 80% or less. Effects of the invention

[0046] The thermal insulation coating composition of the present invention has the effect of suppressing heat conduction by convection by forming an air layer inside the coating film.

[0047] The thermal insulation coating composition of the present invention is manufactured in a liquid type, which has the effect of facilitating thermal insulation application even on equipment with complex shapes, such as valves.

[0048] The thermal insulation coating composition of the present invention has the effect of not burning even under direct heat and not generating toxic gases by using natural materials. Brief explanation of the drawing

[0049] FIG. 1 shows front and cross-sectional images of a film coated by a thermal insulation coating composition manufactured according to one embodiment of the present invention. FIG. 2 shows an image of a coated surface coated with a thermal insulation coating composition manufactured according to one embodiment of the present invention. FIG. 3 shows the temperature change before and after insulation work using an insulating coating composition prepared according to one embodiment of the present invention. Figure 4 shows the change in surface temperature according to the change in thickness of a film coated by a thermal insulation coating composition manufactured according to one embodiment of the present invention. Specific details for implementing the invention

[0050] The present invention will be described in detail below.

[0051] The term 'binder' as used in this invention refers to a key component that binds functional fillers in a heat dissipation coating or radiative cooling coating and maintains the structural stability of the coating layer.

[0052] Generally, a binder uniformly disperses filler particles in a liquid state to form a coating layer on the substrate surface, and then forms a continuous polymeric matrix during the curing process to mechanically support the coating layer. Through this role, the binder prevents aggregation between fillers and performs the function of ensuring the adhesion, durability, moisture resistance, and weather resistance of the coating layer.

[0053] Binders used in radiation-dissipating coatings primarily utilize acrylic, silicone, polyurethane, and epoxy-based polymers. These binders must possess the characteristics to stably fix fillers while maintaining high reflectivity in the solar region, and simultaneously maintain high emissivity in the mid-infrared region.

[0054] As used in this invention, the term "filler" refers to a solid particulate material added to polymer, inorganic binder, or composite material systems to improve mechanical properties, thermal properties, processability, and economic efficiency. Beyond merely increasing the volume of the material, the filler acts as an important functional component that controls the structural characteristics and physical properties of the composite material.

[0055] Generally, fillers commonly used include materials such as silica, calcium carbonate, and alumina. These materials exist in a dispersed state within the material and interact with the matrix to alter the physical and mechanical properties of the entire system. In particular, in composite materials such as coatings, adhesives, ceramic slurries, and construction materials, the type, content, and particle size distribution of the filler have a direct impact on the final properties.

[0056] From a functional perspective, fillers can be classified into reinforcing fillers and non-reinforcing fillers. Reinforcing fillers play a role in improving mechanical strength, wear resistance, and thermal stability by forming strong interfacial bonds with the matrix based on their high specific surface area and strength. Representative examples include silica, alumina, and carbon-based particles, and these fillers enhance structural stability by reinforcing the microstructure of composite materials.

[0057] In contrast, unreinforced fillers are primarily used for purposes such as controlling material density, reducing costs, and regulating thermal properties, and examples include calcium carbonate and talc. Furthermore, beyond simple filling roles, the use of functional fillers to impart specific functions—such as thermal insulation, electrical insulation, and improved flame retardancy—is expanding recently and is recognized as a critical design element in the development of high-performance materials.

[0058] As used in this specification, the term "comprising" is a term that does not exclude the existence or addition of items other than those mentioned.

[0059] In this specification, a numerical range indicated by the term 'to' represents a numerical range that includes the values ​​listed before and after the term as a lower limit and an upper limit, respectively. Where multiple numerical values ​​are disclosed as the upper and lower limits of an arbitrary numerical range, the numerical range disclosed in this specification may be understood as an arbitrary numerical range in which any one of the multiple lower limits and any one of the multiple upper limits are set as the lower limit and upper limit, respectively.

[0060] As used herein, the term 'and / or' is a term comprising each of the mentioned items and all combinations of one or more thereof. Additionally, the singular form includes the plural form unless otherwise noted.

[0061] Terms or words used in this specification and claims should not be interpreted as being limited to their ordinary dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0062] Therefore, it should be understood that the configurations described in the embodiments of this specification are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, and that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0063] A heat dissipation coating composition prepared according to one embodiment of the present invention is characterized by comprising an inorganic binder, a ceramic pigment, and water.

[0064] In one embodiment according to the present invention, the inorganic binder may be characterized by including a potassium silicate salt.

[0065] In one embodiment according to the present invention, the inorganic binder may be characterized by further comprising colloidal silica or metakaolin.

[0066] The above potassium silicate salt may be characterized by being included in the form of an aqueous solution.

[0067] The above colloidal silica may be characterized by having a size of 10 to 50 nm.

[0068] The above colloidal silica may be characterized by being surface-modified with a silane coupling agent.

[0069] The above silane coupling agent may be characterized as being methyltrimethoxysilane (MTMS), hexamethyldisilazane (HMDS), trimethylchlorosilane (TMCS), or octyltriethoxysilane (OTES).

[0070] The above colloidal silica may be characterized by an increased porosity.

[0071] In one embodiment according to the present invention, the metakaolin may be characterized by being manufactured through the steps of: preparing kaolin; grinding the kaolin to 2 to 10 μm; drying the ground kaolin at 100 to 120°C; calcining the dried kaolin at 550 to 750°C; cooling the calcined kaolin; and grinding the cooled kaolin to 1 to 5 μm.

[0072] The above metakaolin may be characterized by being surface-modified with a silane coupling agent.

[0073] The above silane coupling agent may be characterized as being methyltrimethoxysilane (MTMS), 3-aminopropyltriethoxysilane (APTES), or 3-glycidoxypropyltrimethoxysilane (GPTMS).

[0074] In one embodiment according to the present invention, the ceramic pigment may be characterized by comprising oxide glass and aluminum oxide (Al2O3).

[0075] In one embodiment according to the present invention, the ceramic pigment may be characterized by further comprising one or more selected from the group consisting of diatomaceous earth, kaolin, feldspar, calcite, and dolomite.

[0076] The above-mentioned oxide glass may be characterized by containing fine glass particles and hollow glass particles of different sizes.

[0077] The above fine glass particles may be characterized by having a size of 1 to 10 μm, preferably 3 to 8 μm.

[0078] The above hollow glass particles may be characterized by having a size of 10 to 100 μm, preferably 20 to 80 μm.

[0079] In one embodiment according to the present invention, the oxide glass may be characterized by comprising 50 to 75 wt% silicon dioxide (SiO2), 5 to 20 wt% sodium oxide (Na2O), 3 to 15 wt% potassium oxide (K2O), 5 to 20 wt% calcium oxide (CaO), and 0 to 10 wt% boron oxide (B2O3).

[0080] In one embodiment according to the present invention, the thermal insulation coating composition may be characterized by comprising 40 to 60 wt% of an inorganic binder, 20 to 40 wt% of a ceramic pigment, and 10 to 30 wt% of water.

[0081] The above-mentioned thermal insulation coating composition may be characterized by further including an inorganic filler.

[0082] The above inorganic filler may be characterized by comprising one or more selected from the group consisting of calcined diatomite, expanded perlite, mica, and wollastonite.

[0083] In one embodiment according to the present invention, the thermal insulation coating composition may be characterized by comprising a combination of sepiolite, bentonite, or isul.

[0084] In one embodiment according to the present invention, the thermal insulation coating composition may be characterized by comprising 16-20 wt% potassium silicate, 6-10 wt% colloidal silica, 4-10 wt% metakaolin, 3-7 wt% calcined diatomite, 2.5-5.5 wt% expanded perlite, 3-7 wt% glass oxide, 9-15 wt% aluminum oxide, 6-10 wt% mica, 7-13 wt% wollastonite, 1-3 wt% sepiolite, 0.8-2.2 wt% bentonite, 14-20 wt% water, and 1.5-3.5 wt% non-halogen auxiliary agent.

[0085] A heat dissipation coating composition prepared according to one embodiment of the present invention is characterized by being able to be directly coated on plant equipment with a high surface temperature.

[0086] A heat dissipation coating composition prepared according to one embodiment of the present invention is characterized by being a pure inorganic paint with zero VOC.

[0087] A heat dissipation coating composition manufactured according to one embodiment of the present invention is characterized by being a one-component type that can be easily coated on equipment with complex shapes, such as valves and pipe racks.

[0088] A heat dissipation coating composition prepared according to one embodiment of the present invention is characterized by being capable of being applied by a spray method.

[0089] A heat dissipation coating composition prepared according to one embodiment of the present invention is characterized by having non-flammability, not burning even under direct heat, and not generating toxic gases.

[0090] A heat-dissipating coating composition manufactured according to one embodiment of the present invention is characterized by having rust-preventive properties and completely adhering to the application surface, thereby preventing corrosion of the insulation material underneath due to condensation.

[0091] A heat dissipation coating composition prepared according to one embodiment of the present invention is characterized by having a solid content of 23% and a solid content volume ratio of 48%.

[0092] The present invention will be explained in more detail below through examples and experimental examples. However, these examples and experimental examples are intended to illustrate the present invention, and the scope of the present invention is not limited to these examples.

[0093] Example 1

[0094] A first binder solution was prepared by adding potassium silicate to an appropriate amount of water so that it constituted 40 wt% of the total final composition and stirring. Subsequently, a first mixed solution was prepared by adding glass oxide at 12 wt% and aluminum oxide at 18 wt% of the total final composition to the prepared first binder solution and stirring at 300 rpm.

[0095] The above oxide glass was prepared by mixing and grinding 60 wt% silicon dioxide (SiO2), 10 wt% sodium oxide (Na2O), 10 wt% potassium oxide (K2O), 15 wt% calcium oxide (CaO), and 5 wt% boron oxide (B2O3).

[0096] Water was added and stirred until the final viscosity reached 55 KU, and the product was aged and stored at 20°C until use.

[0097] Example 2

[0098] A first binder solution was prepared by adding potassium silicate to an appropriate amount of water so that it constituted 40 wt% of the total final composition and stirring. Subsequently, a first mixed solution was prepared by adding glass oxide at 12 wt% and aluminum oxide at 18 wt% of the total final composition to the prepared first binder solution and stirring at 300 rpm.

[0099] The above oxide glass was prepared by mixing and grinding 60 wt% silicon dioxide (SiO2), 10 wt% sodium oxide (Na2O), 10 wt% potassium oxide (K2O), 15 wt% calcium oxide (CaO), and 5 wt% boron oxide (B2O3). In the step of grinding the oxide glass, the particle size was controlled so that fine glass particles with a size of 5 μm and hollow glass particles with a size of 50 μm were mixed in a 1:1 ratio.

[0100] Water was added and stirred until the final viscosity reached 55 KU, and the product was aged and stored at 20°C until use.

[0101] Example 3

[0102] A first binder solution was prepared by adding potassium silicate to an appropriate amount of water so that it constituted 20 wt% of the total final composition and stirring. Subsequently, a second binder solution was prepared by adding colloidal silica to the prepared first binder solution over a period of 20 minutes so that it constituted 10 wt% of the total final composition, and a third binder solution was prepared by adding metakaolin to the second binder solution so that it constituted 10 wt% of the total final composition and stirring at 1500 to 2500 rpm. A first mixed solution was prepared by adding glass oxide to the prepared third binder solution so that it constituted 12 wt% of the total final composition and aluminum oxide so that it constituted 18 wt% of the total final composition and stirring at 300 rpm.

[0103] The above oxide glass was prepared by mixing and grinding 60 wt% silicon dioxide (SiO2), 10 wt% sodium oxide (Na2O), 10 wt% potassium oxide (K2O), 15 wt% calcium oxide (CaO), and 5 wt% boron oxide (B2O3). In the step of grinding the oxide glass, the particle size was controlled so that fine glass particles with a size of 5 μm and hollow glass particles with a size of 50 μm were mixed in a 1:1 ratio.

[0104] Water was added and stirred until the final viscosity reached 55 KU, and the product was aged and stored at 20°C until use.

[0105] Example 4

[0106] A first binder solution was prepared by adding potassium silicate to an appropriate amount of water so that it was 20 wt% of the total final composition and stirring. Subsequently, a second binder solution was prepared by adding colloidal silica to the prepared first binder solution over a period of 20 minutes so that it was 10 wt% of the total final composition, and a third binder solution was prepared by adding metakaolin to the second binder solution so that it was 10 wt% of the total final composition and stirring at 1500 to 2500 rpm. A first mixed solution was prepared by adding 8 wt% of crushed mica, 10 wt% of wollastonite, and 5 wt% of calcined diatomite to the third binder solution prepared above, with the total final composition being stirred at 1800 to 3000 rpm, and then a second mixed solution was prepared by adding 5 wt% of glass oxide and 12 wt% of aluminum oxide to the first mixed solution prepared above, with the total final composition being stirred at 300 rpm.

[0107] The above oxide glass was prepared by mixing and grinding 60 wt% silicon dioxide (SiO2), 10 wt% sodium oxide (Na2O), 10 wt% potassium oxide (K2O), 15 wt% calcium oxide (CaO), and 5 wt% boron oxide (B2O3). In the step of grinding the oxide glass, the particle size was controlled so that fine glass particles with a size of 5 μm and hollow glass particles with a size of 50 μm were mixed in a 1:1 ratio.

[0108] Water was added and stirred until the final viscosity reached 55 KU, and the product was aged and stored at 20°C until use.

[0109] Example 5

[0110] A first binder solution was prepared by adding potassium silicate to an appropriate amount of water so that it was 18 wt% of the total final composition and stirring. Subsequently, a second binder solution was prepared by adding colloidal silica to the prepared first binder solution over a period of 20 minutes so that it was 8 wt% of the total final composition, and a third binder solution was prepared by adding metakaolin to the second binder solution so that it was 7 wt% of the total final composition and stirring at 1500 to 2500 rpm. A first mixed solution was prepared by adding 8 wt% of crushed mica, 10 wt% of wollastonite, and 5 wt% of calcined diatomite to the third binder solution prepared above, based on the total final composition, and stirring at 1800 to 3000 rpm. Subsequently, a second mixed solution was prepared by adding 5 wt% of glass oxide and 12 wt% of aluminum oxide to the first mixed solution prepared above, based on the total final composition, and stirring at 300 rpm. A third mixed solution was prepared by adding 2 wt% of sepiolite, 1.5 wt% of bentonite, and 2.5 wt% of a non-halogen auxiliary agent to the second mixed solution prepared above, based on the total final composition, and stirring at 200 to 500 rpm.

[0111] The above oxide glass was prepared by mixing and grinding 60 wt% silicon dioxide (SiO2), 10 wt% sodium oxide (Na2O), 10 wt% potassium oxide (K2O), 15 wt% calcium oxide (CaO), and 5 wt% boron oxide (B2O3). In the step of grinding the oxide glass, the particle size was controlled so that fine glass particles with a size of 5 μm and hollow glass particles with a size of 50 μm were mixed in a 1:1 ratio.

[0112] Water was added and stirred until the final viscosity reached 55 KU, and the product was aged and stored at 20°C until use.

[0113] Comparative example

[0114] Commercially available wrap-type insulation was used, and rigid polyurethane foam insulation was used.

[0115] Coating process

[0116] In all experimental examples, the coating was performed on the surface of a heat exchanger equipment measuring 40 cm in width and 20 cm in length (Fig. 2). The surface of the coating was sanded to remove external stains and contaminants, and the thermal insulation coating composition prepared according to each example was prepared by stirring at 150 rpm in advance.

[0117] The above thermal insulation coating composition was placed in a spray container and sprayed onto the surface of the object to be coated until a film with a thickness of 1 mm was formed, and then dried for 30 minutes after spraying. Subsequently, the same process was repeated three times to form a fourth film, and each film was formed with the same thickness. Each film is characterized by the formation of an air layer due to pores within it, which suppresses thermal conductivity through convection and prevents condensation (Fig. 1).

[0118] Experimental Example 1

[0119] To confirm the thermal insulation function of the coating composition according to the present invention, thermal imaging measurements were performed by coating the Comparative Example and Examples 1 to 5 onto the same specimen prepared according to the present invention.

[0120] Comparative example Example 1 Example 2 Example 3 Example 4 Example 5 Before insulation installation (°C) 109.4 109.4 109.5 109.3 109.4 109.5 After insulation installation (°C) 71.5 41.3 39.4 39.2 38.8 38.2

[0121] Based on the above results, when insulation was applied according to the embodiment of the present invention, the temperature decreased by more than 50%, and all embodiments showed a superior insulation effect compared to the comparative example (Fig. 3). In particular, the best insulation performance was confirmed in Example 5, and through this, the insulation effect of the insulation coating composition prepared according to the embodiment of the present invention was confirmed.

[0122] Experimental Example 2

[0123] To determine if there is a difference in the thermal insulation effect due to film thickness and repeated film formation, the inventors performed thermal insulation coating on the same coated body as in Experimental Example 1 with different film thicknesses, and the results are as shown in Table 2 below (Fig. 4).

[0124] Comparative example Example 1 Example 2 Example 3 Example 4 Example 5 Before insulation installation (°C) 218.6 218.7 218.6 218.6 218.7 218.6 Film thickness 1mm 210.7 200.3 192.8 191.2 190.3 188.7 Film thickness 2mm 198.5 190.6 184.3 182.1 182 179.5 Film thickness 3.5mm 196.2 173.5 171.2 167.5 167.3 160.3 Film thickness 5mm 192.4 161.4 158.9 155.3 154.7 147.9 Coating thickness 7mm 189.8 142.1 135.6 131.7 131.9 120.5 Coating thickness 9mm 188.7 110.5 108.3 103.3 103.1 93.6 Film thickness 11mm 178.9 92.6 90.4 87.8 87.2 72.4 Film thickness 13mm 171.3 71.6 70.2 64.5 64.4 58.8

[0125] As confirmed by Table 2 above, the thermal insulation effect increased as the film thickness increased, and overall, superior thermal insulation effects compared to comparative examples were confirmed in the embodiments according to the present invention. The coating composition prepared according to Example 5 exhibited the best thermal insulation effect, and through this, it was confirmed that the thermal insulation coating composition containing potassium silicate salt, colloidal silica, metakaolin, calcined diatomite, expanded perlite, glass oxide, aluminum oxide, mica, wollastonite, sepiolite, bentonite, and non-halogen auxiliary agent had the best thermal insulation effect.

[0126] Experimental Example 3

[0127] To evaluate the chemical stability of the coating composition prepared according to the embodiments of the present invention, the generation of gas through direct flame and corrosion through solvent immersion were evaluated, and the results are shown in Table 3 below. For the chemical resistance and corrosion resistance tests, the coating film surfaces coated with each embodiment were immersed in 50 squares of 5 mm by 5 mm in each solvent, and a peeling test was conducted. The peeling results were determined by measuring the number of peeled specimens out of the 50 specimens.

[0128] Comparative example Example 1 Example 2 Example 3 Example 4 Example 5 water 3 0 0 0 0 0 ethanol 5 1 1 0 1 0 isopropyl alcohol 9 2 1 1 0 0 hydrochloric acid solution 11 5 4 3 4 2 Sodium hydroxide solution 24 10 7 5 6 3 Whether toxic gases (VOCs) are generated O X X X X X

[0129] As shown in Table 3 above, all of Examples 1 to 5 according to the present invention exhibited excellent chemical stability, and unlike the comparative example, it was confirmed that no toxic gases were generated even when heated by direct heat.

[0130] Additionally, notched impact strength was measured to evaluate physical stability. Notched impact strength was performed according to ASTM D256 by creating notches in each specimen, and the experimental results are shown in Table 4 below.

[0131] Comparative example Example 1 Example 2 Example 3 Example 4 Example 5 Notched impact strength (J / cm²) 2 ) 175 218 250 257 256 278

[0132] Through the above results, it was confirmed that the physical stability was superior to that of the comparative example throughout the embodiments according to the present invention. In particular, the best physical stability was confirmed in Example 5, which classifies the pore size of the glass oxide and includes inorganic filler, sepiolite, and bentonite.

Claims

Claim 1 A thermal insulation coating composition comprising an inorganic binder, a ceramic pigment, and water, wherein the inorganic binder comprises a potassium silicate salt, the ceramic pigment comprises oxide glass and aluminum oxide (Al2O3), the thermal insulation coating composition comprises 40 to 60 wt% of the inorganic binder, 20 to 40 wt% of the ceramic pigment, and 10 to 30 wt% of water, wherein the oxide glass comprises fine glass particles and hollow glass particles, wherein the fine glass particles have a size of 3 to 8 μm and the hollow glass particles have a size of 20 to 80 μm, and the oxide glass comprises the fine glass particles and the hollow glass particles in a weight ratio of 1:

1. Claim 2 A thermal insulation coating composition according to claim 1, wherein the thermal insulation coating composition further comprises an inorganic filler, and the filler comprises one or more selected from the group consisting of calcined diatomite, expanded perlite, mica, and wollastonite. Claim 3 A thermal insulation coating composition according to claim 1, characterized in that the thermal insulation coating composition further comprises sepiolite or bentonite. Claim 4 A composition for thermal insulation coating according to claim 1, characterized in that the inorganic binder further comprises colloidal silica or metakaolin. Claim 5 The thermal insulation coating composition according to claim 1, characterized in that the thermal insulation coating composition comprises 16-20 wt% potassium silicate, 6-10 wt% colloidal silica, 4-10 wt% metakaolin, 3-7 wt% calcined diatomite, 2.5-5.5 wt% expanded perlite, 3-7 wt% glass oxide, 9-15 wt% aluminum oxide, 6-10 wt% mica, 7-13 wt% wollastonite, 1-3 wt% sepiolite, 0.8-2.2 wt% bentonite, 14-20 wt% water, and 1.5-3.5 wt% non-halogen auxiliary agent. Claim 6 A composition for a thermal insulation coating according to claim 4, wherein the metakaolin is surface-modified with a silane coupling agent, and the silane coupling agent comprises one or more of methyltrimethoxysilane (MTMS), 3-aminopropyltriethoxysilane (APTES), or 3-glycidoxypropyltrimethoxysilane (GPTMS). Claim 7 A method for manufacturing a thermal insulation coating composition comprises the steps of: preparing a first binder solution by adding potassium silicate salt to water and stirring; preparing a second binder solution by adding colloidal silica to the first binder solution; preparing a third binder solution by adding metakaolin to the second binder solution and stirring at 1500 to 2500 rpm; preparing a first mixed solution by adding crushed mica, wollastonite, and calcined diatomite to the third binder solution and stirring at 1800 to 3000 rpm; preparing a second mixed solution by adding glass oxide, aluminum oxide, and expanded perlite to the first mixed solution and stirring at 200 to 500 rpm; and preparing a third mixed solution by adding sepiolite, bentonite, and a non-halogen auxiliary agent to the second mixed solution and stirring at 200 to 500 rpm. A method for preparing a thermal insulation coating composition comprising the step of adding water to the third mixed solution to adjust the viscosity to 50 to 65 KU; wherein the oxide glass comprises fine glass particles and hollow glass particles, the fine glass particles have a size of 3 to 8 μm, the hollow glass particles have a size of 20 to 80 μm, and the oxide glass comprises the fine glass particles and the hollow glass particles in a weight ratio of 1:

1. Claim 8 A thermal insulation coating method using a thermal insulation coating composition of claim 1, comprising: a step of removing contaminants by sanding the surface of a body to be coated; a step of preparing the thermal insulation coating composition of claim 1 by stirring at 100 to 200 rpm; a step of placing the thermal insulation coating composition in a spray container and spraying it onto the surface of the body to be coated until a coating film with a thickness of 1 to 2 mm is formed; a step of drying the coating film for 20 to 40 minutes; and a step of repeating the spraying step and the drying step 3 to 5 times.

Images