Method for Manufacturing a Hybrid Polyurea Composition with Heat-Insulating Function

Abstract

The present invention relates to a method for manufacturing a hybrid polyurea endowed with a heat-insulating function that implements a multi-layer heat-insulating mechanism by complexly integrating optical interference reflection structure technology, nanopore network technology for blocking heat conduction, radiative cooling emission structure technology, phase change-based thermal buffering structure technology, and plasmonic near-infrared blocking structure technology, in order to actively enhance the heat-insulating function capable of effectively suppressing the rise in surface temperature in a solar exposure environment while maintaining the basic characteristics of the hybrid polyurea having high-speed curing ability and excellent weather resistance. The method comprises the steps of: forming a hybrid polyurea composition comprising methyloxirane polymer with oxirane, ether with 1,2-propanediol (2:1), polypropylene glycol, diethyltoluenediamine, 1,4-butanediol, and 1,4-benzenedicarboxylic acid bis(2-ethylhexyl); and forming a composite heat-insulating structure that induces selective reflection and scattering in the visible light and near-infrared regions of sunlight, wherein the composite heat-insulating structure comprises nanopores The composition is characterized by dispersing particles in which at least one inorganic reflective coating layer selected from TiO₂, Al₂O₃, or ZrO₂ is formed on the surface of a thermal insulation microparticle comprising a low thermal conductivity structure and a reflective structure forming a multi-refractive index interface, wherein the particles include silica aerogel, hollow glass beads, or alumina, and the particles are treated to enhance interfacial adhesion through surface functional groups capable of chemically bonding with a polyurea matrix, thereby increasing thermal insulation performance while maintaining high-speed curing characteristics and weather resistance.

Description

Technology Field

[0001] The present invention relates to a method for manufacturing a functional polyurea that suppresses the rise in surface temperature of a structure exposed to an external environment and improves energy efficiency by imparting infrared reflection and radiant heat blocking functions. More specifically, the invention relates to a method for manufacturing a hybrid polyurea with a heat-insulating function that implements a multi-layer heat-insulating mechanism by complexly integrating optical interference reflection structure technology, nanopore network technology for blocking heat conduction, radiative cooling emission structure technology, phase change-based thermal buffering structure technology, and plasmonic near-infrared blocking structure technology, in order to actively enhance the heat-insulating function capable of effectively suppressing the rise in surface temperature in a solar exposure environment while maintaining the basic characteristics of the hybrid polyurea, such as high-speed curing and excellent weather resistance. Background Technology

[0003] Polyurea is typically formed by a rapid reaction between an isocyanate (prepolymer) and an amine-based polymer, and has been widely used for construction waterproofing, protective lining, and industrial coatings due to its characteristics such as ultra-fast curing, excellent mechanical strength, wear resistance, chemical resistance, and weather resistance.

[0004] In particular, hybrid polyurea allows for the control of curing speed and physical property balance through the mixing of polyols, making it practically applicable in various fields such as building rooftops, storage tanks, exposed concrete protection, and pipe lining.

[0005] However, existing technologies have primarily focused on physical performance such as water resistance, impact resistance, and chemical resistance, while the radiant heat blocking function of coating films has been relatively neglected. In particular, in structures exposed to high temperatures or direct sunlight for extended periods, problems such as thermal fatigue, reduced durability, and increased cooling loads can occur due to rising surface temperatures.

[0007] The following concerns existing technology related to this.

[0008] First, Registered Patent Publication No. 10-2305712, titled "Heat-insulating waterproof coating with excellent tensile strength and heat blocking performance, method of manufacturing the same, and method of construction," is disclosed. This technology discloses the composition and manufacturing method of a urethane-based heat-insulating waterproof coating, and utilizes a method of including a heat-reflective pigment on the surface or in the filler of said coating. However, this is a technology centered on urethane coatings, and does not disclose its application to polyurea compositions or a method of forming a high-reflection layer through particle surface coating.

[0010] Another similar technology is disclosed in Registered Patent Publication No. 10-1886041, "Composite Waterproofing Method Integrating Urethane Composite Sheet and Polyurea," which describes a method for securing waterproofing performance by laminating and integrating a urethane composite sheet and a polyurea coating. However, this technology primarily focuses on improving construction processes and forming composite structures, and does not include means for imparting heat-insulating functions to the polyurea composition itself or surface coating technology for fine particles.

[0012] Therefore, there is a need for a technology that can exhibit an excellent heat insulation effect without compromising the inherent performance of the hybrid polyurea. Prior art literature

[0014] Registered Patent Publication No. 10-2305712 "Heat-insulating waterproof coating with excellent tensile strength and heat blocking performance, method of manufacturing and method of construction thereof" Registered Patent Publication No. 10-1886041 "Composite waterproofing method in which urethane composite sheet and polyurea are integrated" The problem to be solved

[0015] The present invention was created to more actively resolve the aforementioned problems, and the main objective is to provide a hybrid polyurea composition and process structure capable of stably forming a composite heat-insulating structure inside the coating film while maintaining high-speed curing characteristics.

[0017] In addition, another problem addressed by the present invention is to provide a multi-mechanism-based composite thermal insulation structure that simultaneously implements thermal conduction, radiation reflection, radiation emission, and thermal buffering functions.

[0019] In addition, another problem addressed by the present invention is to improve long-term weather resistance and interfacial adhesion through a chemical bonding structure between heat-insulating microparticles with an inorganic reflective coating layer and a polyurea matrix.

[0021] In addition, another problem addressed by the present invention is to provide a structure that effectively reduces the influx of solar radiation by selectively reflecting or scattering specific wavelength regions using a plasmonic resonance structure and a Bragg reflection structure.

[0023] In addition, another problem to be solved is to improve maintenance efficiency by enabling selective reinstallation of only the upper thermal insulation layer through a laminated structure in which the structural protection layer and the thermal insulation functional layer are separated. means of solving the problem

[0025] To achieve the above-mentioned problem, the configuration of the method for manufacturing a hybrid polyurea with a heat-insulating function proposed in the present invention is as follows.

[0027] The method for manufacturing a hybrid polyurea according to the present invention comprises the steps of: forming a hybrid polyurea composition comprising a methyloxirane polymer with oxirane, an ether with 1,2-propanediol (2:1), polypropylene glycol, diethyltoluenediamine, 1,4-butanediol, and 1,4-benzenedicarboxylic acid bis(2-ethylhexyl); and forming a composite thermal insulation structure that induces selective reflection and scattering in the visible light and near-infrared regions of sunlight; wherein the composite thermal insulation structure comprises a low thermal conductivity structure including nanopores and a reflective structure forming a multi-refractive index interface, and together with this, particles having at least one inorganic reflective coating layer selected from TiO₂, Al₂O₃, or ZrO₂ formed on the surface of thermal insulation microparticles comprising silica aerogel, hollow glass beads, or alumina are dispersed within the composition, wherein the particles are treated to enhance interfacial adhesion through surface functional groups capable of chemically bonding with the polyurea matrix, thereby enabling high-speed It is characterized by increasing thermal insulation performance while maintaining hardening properties and weather resistance.

[0029] In addition, the composite thermal insulation structure includes a radiative cooling emission layer designed to increase emissivity in the infrared wavelength range corresponding to the atmospheric transparent window region, and is characterized by being formed to perform the function of actively releasing absorbed thermal energy to the external atmosphere.

[0031] In addition, the method includes a step of forming a closed nanopore network using a gas-generating porogen during the curing process of the hybrid polyurea; wherein the nanopore network is formed by finely trapping a gas generated simultaneously with the curing reaction inside the coating film and comprises independent closed pore structures that are not continuously connected to one another; wherein the independent closed pores are discontinuously dispersed within the solid polyurea matrix to block solid-solid contact paths, and the gas layer trapped inside the pores acts as an insulating medium with low thermal conductivity, and is formed to suppress the straight-line transfer of radiant heat by inducing multiple reflections and scattering at the interface between the pores and the matrix, thereby complexly severing heat transfer paths by solid conduction, gas conduction, and radiative conduction to reduce the effective thermal conductivity of the coating film.

[0033] In addition, the composite heat-insulating structure comprises a nano-multilayer thin film structure in which a plurality of inorganic layers with different refractive indices are alternately stacked, wherein the nano-multilayer thin film structure forms a periodic structure in which a high-refractive-index layer and a low-refractive-index layer are repeatedly stacked, and the optical thickness of each layer is formed to correspond to 1 / 4 of the wavelength to be reflected, and a repeating period (Λ) is set such that a phase difference at the interface is generated by the difference in refractive index between the high-refractive-index layer and the low-refractive-index layer, and the light reflected from adjacent layers causes mutual constructive interference, thereby inducing Bragg reflection for a specific wavelength region with a high heat contribution in sunlight to suppress light transmission into the coating film.

[0035] In addition, the hybrid polyurea is characterized by containing a high-enthalpy phase change material in a finely dispersed state and being manufactured to perform the function of delaying the rise in the surface temperature of the coating film by absorbing latent heat upon the influx of external heat.

[0037] In addition, the composite heat-insulating structure comprises a nanostructure having plasmonic resonance characteristics in the near-infrared region and is characterized by being configured to selectively scatter or reflect near-infrared wavelengths with high heat contribution among sunlight.

[0039] In addition, the hybrid polyurea further includes the step of sequentially forming a structural layer that provides mechanical strength and water resistance as a primary coating and a thermal insulation functional layer in which a composite thermal insulation structure is dispersed at a high concentration as a secondary coating, wherein the secondary coating is formed to allow for selective removal and re-application.

[0041] In addition, the hybrid polyurea in the present invention further comprises heat-insulating microparticles made of silica aerogel, hollow glass beads, or alumina, and an inorganic reflective coating layer made of at least one of TiO₂, Al₂O₃, or ZrO₂ is formed on the surface of the microparticles, and the inorganic reflective coating layer is formed as a dense ceramic protective film structure to improve UV resistance and moisture resistance, and the microparticles are treated to be chemically bonded to the polyurea network through a silane-based binder or an isocyanate-reactive functional group.

[0043] In addition, the above-mentioned fine particles are introduced in the form of a masterbatch pre-dispersed in the main component or the curing agent component, and are characterized by being added in a state in which a reactivity inhibition layer is formed so as not to inhibit the curing reaction rate.

[0045] In addition, the inorganic reflective coating layer is configured to simultaneously perform ultraviolet absorption and photocatalytic reaction inhibition functions, characterized by reducing the degradation rate of the polyurea matrix in a long-term exposure environment. Effects of the invention

[0047] The hybrid polyurea-based composite heat insulation system according to the present invention has the following effects.

[0048] First, the present invention configures a process that enables the formation of nanopores, dispersion of heat-insulating microparticles, and formation of a multilayer optical structure during the curing process, while maintaining the characteristics of polyurea that rapidly cures after on-site mixing of the main component and the curing agent. Accordingly, physical strength can be secured within a short time after application, thereby improving work efficiency, and at the same time, a uniform and dense composite heat-insulating structure is stably realized within the coating film.

[0050] Furthermore, the present invention is configured to enable the combined action of suppression of solid and gas conduction by a closed nanoporous structure, Bragg reflection by a nano-multilayer thin film, selective blocking of near-infrared rays by a plasmonic structure, infrared emission by a radiative cooling emission layer, and latent heat absorption by a phase change material. Accordingly, unlike conventional technology relying on a single reflective pigment, solid conduction, gas conduction, and radiative conduction can be simultaneously reduced, and the rise in surface temperature under solar exposure conditions can be effectively suppressed.

[0052] Furthermore, the present invention can suppress the degradation of the polyurea matrix caused by ultraviolet rays and reduce the penetration of moisture and external environmental factors by applying heat-insulating microparticles formed with an inorganic reflective coating layer. In addition, interfacial delamination and detachment are prevented by forming chemical bonds between the microparticles and the polyurea network through silane-based binders or isocyanate-reactive functional groups. Accordingly, structural stability and heat-insulating performance are maintained even in long-term usage environments.

[0054] Furthermore, since the present invention includes a structure that selectively reflects or scatters the near-infrared region, which has a high heat contribution among sunlight, the heat blocking efficiency is improved relative to the same thickness. In particular, by combining an optical interference-based reflection structure with a plasmonic resonance structure, precise control over a specific wavelength range is possible, and the design freedom of the heat blocking efficiency is increased.

[0056] Furthermore, the phase change material dispersed within the coating film of the present invention delays the temperature rise by absorbing latent heat when external heat is introduced. Accordingly, the rapid temperature peak at the beginning of solar radiation is mitigated, and thermal shock is reduced even in a repetitive thermal cycling environment, thereby improving structural stability.

[0058] Furthermore, since the present invention can be formed with a laminated structure in which the structural protection layer and the thermal insulation functional layer are separated, only that layer can be selectively removed and re-applied when the thermal insulation functional layer deteriorates. Accordingly, maintenance costs are reduced compared to the conventional method of removing the entire coating film, and economic efficiency is improved in terms of long-term operation.

[0060] Consequently, the present invention has the effect of simultaneously improving thermal insulation performance, durability, constructability, and maintenance efficiency by implementing a composite thermal insulation structure that simultaneously suppresses multiple paths of heat transfer based on a hybrid polyurea system that maintains high-speed curing characteristics. Specific details for implementing the invention

[0062] Hereinafter, the structure of the present invention and the resulting operation and effects will be described collectively with reference to the attached drawings.

[0064] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Furthermore, throughout the entire specification, the same reference numerals refer to the same components.

[0066] The present invention relates to a method for manufacturing a functional polyurea that suppresses the rise in surface temperature of a structure exposed to an external environment and improves energy efficiency by imparting infrared reflection and radiant heat blocking functions.

[0068] In particular, the present invention relates to a method for manufacturing a hybrid polyurea endowed with a heat-insulating function that implements a multi-layer heat-insulating mechanism by combining optical interference reflection structure technology, nanopore network technology for blocking heat conduction, radiative cooling emission structure technology, phase change-based thermal buffering structure technology, and plasmonic near-infrared blocking structure technology, in order to actively enhance the heat-insulating function capable of effectively suppressing the rise in surface temperature in a solar exposure environment while maintaining the basic characteristics of the hybrid polyurea having high-speed curing ability and excellent weather resistance.

[0070] The method for manufacturing a hybrid polyurea according to the present invention comprises the steps of: forming a hybrid polyurea composition comprising a methyloxirane polymer with oxirane, an ether with 1,2-propanediol (2:1), polypropylene glycol, diethyltoluenediamine, 1,4-butanediol, and 1,4-benzenedicarboxylic acid bis(2-ethylhexyl); and forming a composite heat-insulating structure that induces selective reflection and scattering in the visible light and near-infrared regions of sunlight.

[0071] The above composite thermal insulation structure comprises a low thermal conductivity structure including nanopores and a reflective structure forming a multi-refractive index interface, and together with this, particles having at least one inorganic reflective coating layer selected from TiO₂, Al₂O₃, or ZrO₂ formed on the surface of thermal insulation microparticles including silica aerogel, hollow glass beads, or alumina are dispersed in the composition, wherein the particles are treated to enhance interfacial adhesion through surface functional groups capable of chemically bonding with a polyurea matrix, thereby increasing thermal insulation performance while maintaining high-speed curing characteristics and weather resistance.

[0073] As described above, the hybrid polyurea according to the present invention is a reactive polymer coating material manufactured by combining various types of liquid chemical components; simply put, it refers to a special waterproof and protective film material configured to harden immediately on-site by mixing liquid components that harden very quickly when reacting with each other.

[0074] These hybrid polyureas consist of the main components of methyloxirane polymer with oxirane, ether with 1,2-propanediol (2:1), polypropylene glycol, diethyltoluenediamine, 1,4-butanediol, and 1,4-benzenedicarboxylic acid bis(2-ethylhexyl).

[0075] The above methyloxirane polymer with oxirane is a main component that forms the basic polymer chain and plays a role in determining the elasticity and strength of the final coating.

[0076] The above ether with 1,2-propanediol (2:1) is a component that controls the flexibility of the polymer network and improves crack prevention and shock absorption functions.

[0077] The above polypropylene glycol is a soft component that provides the extensibility and flexibility of the coating film, thereby increasing adaptability to changes in the external environment.

[0078] The above-mentioned diethyltoluenediamine is a key reaction component that rapidly induces the curing reaction, allowing a coating film to be formed within seconds to minutes after mixing.

[0079] The above 1,4-butanediol promotes linkage between polymer chains, thereby increasing the mechanical strength of the coating film.

[0080] The above 1,4-benzenedicarboxylic acid bis(2-ethylhexyl) functions to improve the weather resistance, water resistance, and long-term stability of the coating film.

[0081] Although these components each perform different roles, when mixed, they chemically react with each other to form a single dense and strong polymer structure.

[0082] The composition of the present invention is usually stored in two parts, a main component (A) and a curing agent (B), as follows.

[0083] Here, the main component, Agent A, contains a polymer-forming ingredient, and the hardener component, Agent B, contains a reactive ingredient that triggers the curing reaction. Because these two components are highly reactive with each other, they are stored in separate containers without being mixed in advance. The moment the two components are sprayed simultaneously or mixed at the construction site, the chemical reaction begins, and a solid film is formed at a very rapid rate.

[0084] Immediately after mixing, the following process occurs. First, reactive functional groups begin to bond with each other. Then, molecular chains are rapidly linked. As numerous bonds are formed simultaneously, a three-dimensional polymer network is created. Finally, the liquid composition increases in viscosity and converts into a solid film within seconds.

[0085] Thanks to these rapid curing characteristics, large-area application is possible, runoff is minimal, and the coating stabilizes before being affected by the external environment.

[0086] Once curing is complete, a three-dimensional structure is formed internally in which molecular chains are tightly connected to each other. This structure provides properties such as excellent water resistance, high impact resistance, superior wear resistance, and durability against UV rays and climate changes.

[0087] In other words, a high-performance coating structure is completed that forms a very dense and strong protective film, rather than simply a hardening material.

[0088] In general, high-speed curing materials have difficulty forming complex functional structures internally, such as pores or reflective layers.

[0089] However, in the present invention, process conditions and additive structures are configured so that a structure responsible for heat insulation is stably formed inside the coating film without controlling the curing speed.

[0091] The heat-insulating function according to the present invention is not realized by the addition of a single reflective particle, but by forming a structure within the coating film in which a plurality of heat-blocking mechanisms operate in combination.

[0092] The above composite heat shield structure may include a heat conduction suppression structure, an optical reflection structure, a radiation emission structure, a selective near-infrared blocking structure, and a thermal buffering structure.

[0093] (1) Nanopore-based low thermal conductivity structure

[0094] In the present invention, fine closed nanopores are formed inside the coating film by introducing a gas-generating porogen during the curing process of the hybrid polyurea.

[0095] The above porogen decomposes or reacts simultaneously with the curing reaction to generate gas, and the generated gas is trapped inside the rapidly curing polyurea matrix.

[0096] The pores formed during this process have independent, closed structures that are not continuously connected to one another and are discontinuously dispersed throughout the entire film.

[0097] The following effects occur due to the formation of such a structure.

[0098] First, heat transfer by solid conduction is reduced as the continuous contact paths of the solid polyurea matrix are physically blocked by the pores. Additionally, heat transfer by gas conduction is suppressed because a gas layer with very low thermal conductivity is formed inside the pores and acts as an insulating medium. Furthermore, the radiative conduction component is also reduced as incident radiative heat undergoes repeated multiple reflections and scattering at the interface between the pores and the matrix.

[0099] Therefore, the nanoporous structure according to the present invention implements a composite thermal insulation mechanism that simultaneously suppresses different heat transfer pathways, namely solid conduction, gas conduction, and radiation conduction.

[0101] (2) Bragg reflection structure by nano multilayer thin film

[0102] The composite heat-insulating structure of the present invention may include a nano-multilayer thin film structure in which a plurality of inorganic layers with different refractive indices are alternately stacked.

[0103] The above structure is formed in a form where high-refractive index layers and low-refractive index layers are repeated periodically, and the optical thickness of each layer is configured to correspond to 1 / 4 of the wavelength of the reflection target.

[0104] Accordingly, the light reflected from each interface has a phase difference, and a repetition period is set to cause mutual constructive interference with the light reflected from adjacent interfaces.

[0105] Due to this periodic layered structure, Bragg reflection occurs in specific wavelength regions of sunlight with high heat contribution, and light of those wavelengths cannot penetrate into the coating film but is reflected outward.

[0106] As a result, the radiant energy entering the coating is reduced, effectively suppressing the rise in surface temperature.

[0108] (3) Radiation cooling emission layer

[0109] The composite heat-insulating structure according to the present invention may further include a radiative cooling emission layer designed to increase emissivity in the infrared wavelength range of the atmospheric transparent window region.

[0110] The above-mentioned emission layer is configured to re-emit thermal energy absorbed by the coating film into a specific infrared wavelength range, and the emitted radiant energy passes through the atmosphere and is transferred to the external space.

[0111] Unlike simple reflection functions, this radiative cooling mechanism plays a role in reducing surface heat accumulation by actively discharging already absorbed thermal energy to the outside.

[0113] (4) Plasmonic near-infrared blocking structure

[0114] The composite thermal insulation structure may include nanostructures having plasmonic resonance characteristics in the near-infrared region.

[0115] The above nanostructure induces electromagnetic resonance for specific near-infrared wavelengths, thereby selectively scattering or reflecting light of those wavelengths.

[0116] Since the near-infrared region of sunlight contributes significantly to heat generation, selectively blocking this region can more effectively reduce the thermal energy flowing into the coating.

[0117] Unlike conventional scattering particles, this structure acts selectively in specific wavelength ranges, offering the advantage of precise control over thermal insulation efficiency.

[0119] (5) Phase change-based thermal buffering system

[0120] The hybrid polyurea according to the present invention may include a high-enthalpy phase change material in a finely dispersed form.

[0121] The above-mentioned phase change material undergoes a solid-liquid or solid-solid phase transition within a certain temperature range when external heat is introduced, and absorbs a large amount of latent heat during this process.

[0122] During the phase change, thermal energy is stored without a temperature rise, so the rapid temperature increase of the coating surface is delayed.

[0123] This thermal buffering effect contributes to lowering the temperature peak at the beginning of solar exposure and provides stable temperature control even under repetitive solar irradiation conditions.

[0125] The hybrid polyurea composition according to the present invention may additionally include inorganic microparticles for heat insulation to further improve heat insulation performance.

[0126] The above-mentioned microparticles may include silica aerogel, hollow glass beads, or alumina, and these perform the function of inhibiting heat transfer through their own low thermal conductivity or internal hollow structure.

[0127] In particular, an inorganic reflective coating layer may be formed on the surface of the above-mentioned microparticles. The coating layer is composed of at least one of TiO₂, Al₂O₃, or ZrO₂ and is formed as a dense ceramic protective film structure.

[0128] Such an inorganic reflective coating layer performs the following functions.

[0129] First, weather resistance is improved by suppressing photodegradation and degradation of the polyurea matrix through UV blocking.

[0130] Second, the dense ceramic structure inhibits the penetration of moisture and external contaminants, ensuring long-term structural stability.

[0131] Third, even when TiO₂ is included, the photocatalytic reaction is substantially blocked by forming a stable coating layer to suppress the decomposition of the organic matrix by photocatalytic activity.

[0132] In addition, the above-mentioned microparticles may undergo surface modification treatment to improve interfacial adhesion with the polyurea matrix. Specifically, by introducing a silane-based binder or an isocyanate-reactive functional group, the surface of the microparticles is configured to chemically bond with the polyurea network.

[0133] Accordingly, a covalent-based interfacial bonding structure is formed rather than simple physical dispersion, and the detachment, aggregation, or sedimentation of fine particles is suppressed during the curing process.

[0134] As a result, the present invention can simultaneously secure thermal insulation performance and long-term durability without impairing the high-speed curing characteristics of the hybrid polyurea.

[0136] The hybrid polyurea thermal insulation system according to the present invention can be formed with a laminated structure that takes into account functional separation.

[0137] The above coating may include at least a primary coating and a secondary coating.

[0138] (1) Primary coating: Structural protective layer

[0139] The primary coating is a structural layer formed in direct contact with the substrate, performing mechanical strength, water resistance, and substrate protection functions. The primary coating is formed based on a dense polyurea network structure and protects the underlying substrate from external impact, cracking, moisture penetration, and chemical corrosion. This layer acts as a base layer responsible for the structural stability of the entire system.

[0141] (2) Secondary coating: Composite thermal insulation functional layer

[0142] The secondary coating is formed on top of the primary coating and is a functional layer in which the previously described composite thermal insulation structure is dispersed at a high concentration. The secondary coating may optionally include a nanoporous structure, a nano-multilayer reflective structure, a radiative cooling emission structure, a plasmonic near-infrared blocking structure, and a phase change material. Accordingly, a thermal insulation function is intensively implemented to suppress heat inflow from sunlight through multiple mechanisms and minimize surface heat accumulation. In particular, the secondary coating can be designed with a composition and thickness optimized for thermal insulation and is configured with a focus on thermal control functions rather than structural strength.

[0144] (3) Optionally reconstructable structure

[0145] In the present invention, if the secondary coating deteriorates or its thermal insulation performance deteriorates during long-term use, the invention can be designed so that only the secondary coating can be selectively removed and re-applied. To this end, the interface between the primary coating and the secondary coating can be configured to ensure sufficient adhesion while allowing only the upper layer to be removed by physical or mechanical means.

[0146] This layered separation structure allows only the functional layer to be replaced without removing the entire coating, thereby reducing maintenance costs and improving long-term economic efficiency.

[0148] The present invention, composed as described above, can provide a composite thermal insulation system that simultaneously suppresses multiple heat transfer pathways, ensures long-term durability and interfacial stability, and improves maintenance efficiency by applying a combination of a nanoporous structure, a multilayer optical reflection structure, a plasmonic near-infrared blocking structure, a radiative cooling emission layer, a phase change thermal buffering system, and inorganic reflective coating microparticles based on a hybrid polyurea that maintains high-speed curing characteristics.

[0150] The present invention described above has been explained with reference to an exemplary embodiment illustrated in the drawings, but this is merely illustrative, and it should be made clear to those skilled in the art that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true technical scope of protection of the present invention should be interpreted by the appended claims, and all technical ideas within an equivalent scope should be interpreted as being included within the scope of rights of the present invention.

Claims

Claim 1 A step of forming a hybrid polyurea composition by mixing Agent A, which includes an isocyanate (prepolymer) that is a polymer-forming component, and Agent B, which includes a methyloxirane polymer with oxirane, ether with 1,2-propanediol (2:1), polypropylene glycol, diethyltoluenediamine, 1,4-butanediol, and 1,4-benzenedicarboxylic acid bis(2-ethylhexyl); A method for manufacturing a hybrid polyurea with a heat-insulating function, comprising the step of forming a composite heat-insulating structure that induces selective reflection and scattering in the visible light and near-infrared regions of sunlight; wherein, together with this, particles having formed at least one inorganic reflective coating layer selected from TiO₂, Al₂O₃, or ZrO₂ on the surface of heat-insulating microparticles comprising silica aerogel, hollow glass beads, or alumina are dispersed in the composition, wherein the particles are treated to improve interfacial adhesion through surface functional groups capable of chemically bonding with the polyurea matrix, thereby increasing heat-insulating performance while maintaining high-speed curing characteristics and weather resistance. Claim 2 delete Claim 3 A method for manufacturing a hybrid polyurea with a heat-insulating function according to claim 1, comprising the step of forming a closed nanopore network using a gas-generating porogen during the curing process of the hybrid polyurea; wherein the nanopore network is formed by finely trapping a gas generated simultaneously with the curing reaction inside the coating film and has an independent closed pore structure that is not continuously connected to one another, and wherein the independent closed pores are discontinuously dispersed within the solid polyurea matrix to block solid-solid contact paths, and the gas layer trapped inside the pores acts as an insulating medium with low thermal conductivity, and is formed to suppress the straight-line transfer of radiant heat by inducing multiple reflections and scattering at the interface between the pores and the matrix, thereby complexly severing heat transfer paths by solid conduction, gas conduction, and radiative conduction to reduce the effective thermal conductivity of the coating film. Claim 4 delete Claim 5 delete Claim 6 delete Claim 7 delete

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