Purpose-based road construction multi-layer structure road pavement coating layer

Abstract

The present invention relates to a multilayer coating layer for road paving for purpose-based road construction, and in particular, to a multilayer coating layer for road paving for purpose-based road construction that improves road safety and durability by simultaneously or selectively providing temperature visualization, radiant heat blocking, and photoreactive heat generation functions. Accordingly, the present invention is characterized by including a road paving asphalt concrete having an anti-slip functional layer; and a functional multilayer coating layer (200) having visualization, blocking, and heat generation functions, which is provided on the upper part of the road paving asphalt concrete.

Description

Technology Field

[0001] The present invention relates to a multilayer coating layer for road paving for purpose-based road construction, and in particular, to a multilayer coating layer for road paving for purpose-based road construction that improves road safety and durability by simultaneously or selectively providing temperature visualization, radiant heat blocking, and photoreactive heat generation functions. Background Technology

[0002] Generally, existing roads were limited simply to the smooth passage and movement of vehicles and pedestrians. However, due to the increase in traffic volume, environmental changes, and the rise in traffic accidents, various functions were required to create a safer road environment and reduce accidents.

[0003] Furthermore, as we enter a digital and AX (AI Transformation) transition period, including the introduction of AI technology and the commercialization of autonomous vehicles, the demand for various road functions has accelerated even further.

[0004] In fact, the concept of destination-based roads has already been introduced in the road and transportation sectors, with representative examples including the expressway Hi-Pass system and entry / exit guidance lines. Amidst this trend, the need for constructing destination-based roads equipped with various functions is emerging.

[0005] Conventional technology was proposed in Patent No. 10-1009051, and the proposed technology involves mixing a reversible thermochromic pigment that reacts in the range of -15℃ to 70℃ with plastic or synthetic resin to change color at a specific temperature. It is composed of a functional layer and a protective layer to ensure the lifespan of the thermochromic pigment and enables multi-color change according to different temperature ranges, allowing it to be applied to roads. However, there were problems such as high production costs and poor construction adhesion due to the separation of the functional layer and the protective layer, and a limited temperature range of application.

[0006] Other prior art patents, No. 10-2046145 and No. 10-2015-0074998, were proposed. The proposed technology is a heat-insulating coating composition containing a photocatalytic material and a metal inorganic pigment (TiO2). Although heat-insulating performance is secured by increasing the reflectance of the near-infrared region, which is a major cause of temperature rise in sunlight, the reflection and absorption of the entire multilayered light spectrum, including ultraviolet, visible, and infrared rays, are insufficient, and there is a problem that a formulation technology applicable to various synthetic resins needs to be established.

[0007] Another prior art is Patent No. 10-1256125, which is related to photoreactive exothermic reaction. It aims to improve curing and adhesive strength by increasing the self-heating properties of a coating composition through a formulation containing photothermal particles or pigments. However, there were many cases where it was applied to fibers or fabrics, and there were problems with applying it to roads. Prior art literature

[0008] Patent No. 10-1009051 (Dec. 29, 2015) Patent No. 10-2046145 (Nov. 21, 2019) Patent No. 10-2015-0074998 (October 6, 2016) Patent No. 10-1256125 (April 9, 2013) The problem to be solved

[0009] The present invention was devised to resolve such problems, and aims to provide a multi-layered road paving coating layer for constructing a purpose-based road in which intuitive information can be provided to drivers by visually displaying the road surface temperature through the visualization function of a functional multi-layer coating layer provided on the upper part of the road paving asphalt.

[0010] In addition, the present invention aims to provide a multi-layered road paving coating layer for constructing purpose-based roads that can suppress the rise in road surface temperature and mitigate the urban heat island effect by blocking solar radiation through the blocking function of a functional multi-layer coating layer provided on top of the road paving asphalt.

[0011] In addition, the present invention aims to provide a multi-layered road paving coating layer for constructing a purpose-based road that ensures road safety while preventing winter freezing through the heat generation function of a functional multi-layer coating layer provided on top of the road paving asphalt.

[0012] Furthermore, the present invention aims to provide a multi-layered coating layer for road paving for the construction of purpose-built roads that can maintain stable performance over a long period by enhancing durability and wear resistance. means of solving the problem

[0013] The present invention for achieving the above objective is,

[0014] Road paving asphalt (100) having an anti-slip functional layer; and

[0015] A functional multilayer coating layer (200) having visualization, blocking, and heating functions is provided on the upper part of the above-mentioned road pavement asphalt, thereby enabling the simultaneous or selective provision of temperature visualization, radiant heat blocking, and photoreactive heating functions to improve road safety and durability. Effects of the invention

[0016] Accordingly, the present invention enables the road surface temperature to be visually displayed through the visualization function of a functional multilayer coating layer provided on the upper part of the road pavement asphalt, thereby allowing for the achievement of design aesthetics of the road.

[0017] In addition, this enables the driver to drive safely based on intuitive information while driving.

[0018] In addition, the present invention can achieve the effect of suppressing the rise in road surface temperature and mitigating the urban heat island effect by blocking solar radiation through the blocking function of a functional multilayer coating layer provided on the upper part of the road pavement asphalt.

[0019] In addition, the present invention provides a heating function for a functional multilayer coating layer provided on the upper surface of the road pavement asphalt, thereby enabling the effect of ensuring road safety while preventing freezing in winter.

[0020] In addition, the present invention can achieve the effect of reducing the nighttime cooling speed of roads by 15% to 30% and delaying the nighttime freezing critical condition through a mid- and far-infrared (MIR / FIR) low-emission structure at night.

[0021] Furthermore, the present invention can achieve the additional effect of maintaining stable performance over a long period by enhancing durability and wear resistance through this. Brief explanation of the drawing

[0022] FIG. 1 is an exemplary diagram illustrating an embodiment of a multilayer structured coating layer for road paving for purpose-based road construction according to the present invention. FIG. 2 is an example diagram illustrating the gradual change in color when a thermochromic pigment is applied to the temperature visualization layer in a multilayer road paving coating layer for purpose-based road construction according to the present invention. FIG. 3 is a graph illustrating the measurement of solar reflectance by applying a reflective pigment to the radiant heat blocking layer in a multilayer road paving coating layer for purpose-based road construction according to the present invention. FIG. 4 is a graph showing the results of a heat generation performance test of a photoreactive heat layer in a multilayer road paving coating layer for purpose-based road construction according to the present invention. FIG. 5 is a graph showing the results of a test on the abrasion resistance of a filler in a multilayer road paving coating layer for purpose-based road construction according to the present invention. FIGS. 6 to 8 are images illustrating the actual application of a multilayer road paving coating layer for purpose-based road construction according to the present invention. Specific details for implementing the invention

[0023] Hereinafter, the present invention may be subject to various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention.

[0024] These embodiments are provided to further explain the invention to those skilled in the art to which the invention pertains. Accordingly, the shape of each element shown in the drawings may be exaggerated to emphasize a clearer explanation, and in describing the invention, if it is determined that a detailed description of related known technology may obscure the essence of the invention, such detailed description is omitted.

[0025] The terms used in this invention are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise.

[0026] In the present invention, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not excluding in advance the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0027] First, the present invention may be composed of one or more of a road paving asphalt concrete (100) and a functional multilayer coating layer (200) having visualization, blocking, and heating functions.

[0028] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the attached drawings.

[0029] Referring to Fig. 1,

[0030] FIG. 1 is an exemplary diagram illustrating an embodiment of a multilayer structured coating layer for road paving for purpose-based road construction according to the present invention.

[0031] The multilayer coating layer for road paving with a multilayer structure for constructing a purpose-based road according to the present invention is provided to include a road paving asphalt concrete (100) having an anti-slip functional layer (110) and a functional multilayer coating layer (200) having visualization, blocking, and heat generation functions on the upper part of the road paving asphalt concrete (100).

[0032] Here, the functional multilayer coating layer (200) may be sequentially laminated or optionally provided on the road paving asphalt (100) with a temperature visualization layer (210) having a temperature-sensitive color change function, a radiant heat blocking layer (220) containing a photocatalytic material that reflects, absorbs, and radiates near-infrared rays, infrared rays, visible light, and ultraviolet rays, and a photoreactive heating layer (230) that absorbs near-infrared rays, infrared rays, visible light, and ultraviolet rays to generate heat and emits low far-infrared rays (MIR / FIR).

[0033] The temperature visualization layer (210) of the functional multilayer coating layer (200) according to the present invention is configured to allow visual confirmation of the road condition (e.g., overheating, freezing) by changing the color of the road surface according to temperature, and it is preferable to include 100 parts by weight of binder resin, 10 to 20 parts by weight each of thermochromic pigment and thermochromic pigment of different colors, 5 to 14 parts by weight of benzotriazole-based ultraviolet absorber as an additive, 3 to 12 parts by weight of TiO2 nanoparticles, 5 parts by weight of ZnO nanoparticles, 7 to 10 parts by weight of near-infrared (NIR) reflective pigment, and 3 to 5 parts by weight of curing agent.

[0034] The binder resin above serves as the basis for the mechanical strength and adhesion of the road coating, and it is preferable to provide one or more selected from epoxy resin, polyurethane resin (PU), MMA resin (Methyl Methacrylate), acrylic resin, silicone resin, polyester resin, and synthetic rubber resin (SBR / SBS). The thermochromic pigment above is preferably configured to ensure color change visibility and to react to a selected temperature within the range of -35℃ to 75℃. At this time, it is preferable to apply two colors excluding white to enable the temperature to be visualized while allowing the temperature to be set in 1℃ increments.

[0035] In order to maintain the color and function of the coating layer for a long time and prevent discoloration and deterioration while ensuring that the above-mentioned benzotriazole-based additive is not damaged, it is preferable to use a high-performance ultraviolet (UV) absorber of the benzotriazole-based formula represented by C30H29N3O. The UV absorber absorbs ultraviolet rays, and the above-mentioned TiO2 nanoparticles are intended to improve whiteness, light blocking, and weather resistance. Since the nano grade is prone to increased viscosity and aggregation, it is preferable to perform surface treatment (hydrophobization) and use a dispersant. The above-mentioned ZnO nanoparticles provide light stability, assist in UV blocking, and antibacterial functions, and the near-infrared (NIR) reflective pigment reflects near-infrared (NIR) rays to provide a radiant heat reduction function.

[0036] The above temperature visualization layer (210) can visualize the road surface temperature through temperature-sensitive color change, ultraviolet blocking, and near-infrared reflection, identify freezing and overheating sections, and prevent deterioration of the coating layer, thereby ensuring preventive safety by visually checking the road condition.

[0037] The above-mentioned temperature visualization layer (210) is preferably prepared by stirring for 25 minutes in a medium temperature (20℃~40℃) stirrer according to the mixing ratio, and then adding BPO-50 (curing agent) to the prepared material at a mixing ratio of 30:1 and stirring for 5 minutes. The curing agent used at this time can be in powder or liquid form, and BPO-50, BPO-70, softening agent, etc. can be used.

[0038] Referring to Fig. 2,

[0039] FIG. 2 is an example diagram illustrating the gradual change in color when a thermochromic pigment is applied to the temperature visualization layer in a multilayer road paving coating layer for purpose-based road construction according to the present invention.

[0040] In the coating layer for road paving according to the present invention, when a temperature visualization layer is provided on the upper surface of the asphalt paving, when a thermochromic pigment is applied to the temperature visualization layer, the temperature can be easily confirmed by observing the color changing in stages from a low temperature of -35℃ to a high temperature of 75℃, -35℃: blue → very low temperature, 0℃: purple → freezing risk zone, 25℃: green → normal driving temperature, and 75℃: red → overheating state. That is, the colder the road surface, the bluer it turns, and the hotter it turns, the redder it turns, allowing drivers or managers to easily recognize the road condition.

[0041] FIG. 3 is a graph showing the measurement of solar reflectance by applying TiO2 (P25), ZnO, and NIR reflective pigments to the radiant heat blocking layer in a multilayer road paving coating layer for purpose-based road construction according to the present invention.

[0042] The radiant heat blocking layer (220) of the functional multilayer coating layer (200) according to the present invention includes a photocatalytic material to reflect, absorb, and radiate near-infrared rays, infrared rays, visible light, and ultraviolet rays, and comprises 100 parts by weight of binder resin, 10 to 20 parts by weight of TiO2 nanoparticles, 10 to 12 parts by weight of ZnO nanoparticles, 8 to 15 parts by weight of NIR reflective pigment, and 3 to 5 parts by weight of curing agent.

[0043] Here, the binder resin serves as the basis for the mechanical strength and adhesion of the road coating, and it is preferable that it be provided with one or more selected from epoxy resin, polyurethane resin (PU), MMA resin (Methyl Methacrylate), acrylic resin, silicone resin, polyester resin, and synthetic rubber resin (SBR / SBS).

[0044] It is preferable that the above TiO2 nanoparticles consist of one or more selected from anatase-type TiO2 or rutile-type TiO2, and it is preferable that they be provided as anatase / rutile mixed-type P25 TiO2 so that light reflectivity and ultraviolet decomposition functions are simultaneously provided. That is, surface organic contamination decomposition and antifouling (contamination prevention) functions can be provided while suppressing the generation of radiant heat.

[0045] It is preferable that the above ZnO nanoparticles have an average particle size in the range of 20 nm to 50 nm to ensure optical stability and dispersibility, and it is preferable that the above NIR reflective pigment be composed of a white, gray, or blue pigment, and it is even more preferable that it be provided with a function to reflect near-infrared rays in the wavelength range of 700 nm to 2500 nm.

[0046] It is preferable that the above curing agent be provided with one or more selected from amine-based curing agents or isocyanate-based curing agents.

[0047] As shown in FIG. 3, the results of measuring solar reflectance in a multilayer road paving coating layer for purpose-based road construction according to the present invention, in which TiO2 (P25), ZnO, and NIR reflective pigments are applied to the radiant heat blocking layer, show that solar radiant heat is blocked with a reflectance of 70% or more in the near-infrared region of 700~2500 nm. At this time, the X-axis represents wavelength (nm) and the Y-axis represents reflectance (%), with 400 nm=30%, 700 nm=50%, 1000 nm=65%, 1500 nm=70%, 2000 nm=72%, and 2500 nm=75%. This effectively reflects the near-infrared region of sunlight, suppressing the temperature rise of the road surface and mitigating the urban heat island effect. That is, while the above-mentioned radiant heat blocking layer (220) controls sunlight and heat transmitted from above, TiO2 (P25), ZnO, and NIR reflective pigments control sunlight reflection and absorption, and ultraviolet and infrared rays are blocked, thereby suppressing the rise in road surface temperature. At this time, the reflectance and absorption rates for each light wavelength can be increased through reflection of near-infrared rays (700~2500nm), improvement of absorption extinction rate, reflection of visible light (400~700nm), improvement of absorption extinction rate, and reflection of ultraviolet rays (100~400nm), improvement of absorption extinction rate.

[0048] It is preferable that the above-mentioned radiant heat blocking layer (220) be prepared by stirring for 25 minutes in a medium temperature (20℃~40℃) stirrer according to the mixing ratio, and that the prepared material be used by adding BPO-50 (curing agent) at a mixing ratio of 30:1 and stirring for 5 minutes. The curing agent used at this time can be in powder or liquid form, and BPO-50, BPO-70, softening agent, etc. can be used.

[0049] FIG. 4 is a graph showing the results of a heat generation performance test of a photoreactive heat layer in a multilayer road paving coating layer for purpose-based road construction according to the present invention.

[0050] The functional multilayer coating layer (200) according to the present invention comprises a photoreactive heating layer (230) that absorbs near-infrared rays, infrared rays, visible light, and ultraviolet rays to generate heat and emits low amounts of mid- and far-infrared rays (MIR / FIR), and comprises 100 parts by weight of binder resin, 5 to 12 parts by weight of a benzotriazole-based high-performance ultraviolet (UV) absorber represented by the chemical formula C30H29N3O, 10 to 15 parts by weight of carbon black, 8 to 12 parts by weight of graphite, 5 to 10 parts by weight of graphene nanoplatelets (GNP), 5 to 8 parts by weight of titanium nitride (TiN), 3 to 6 parts by weight of bismuth sulfide (Bi2S3), 5 to 9 parts by weight of silicon dioxide (SiO2), and 7 to 9 parts by weight of aluminum oxide (Al2O3). It contains 3 to 5 parts by weight of a curing agent (amine-based, isocyanate-based, etc.).

[0051] Here, the binder resin serves as the basis for the mechanical strength and adhesion of the road coating, and it is preferable that it be provided with one or more selected from epoxy resin, polyurethane resin (PU), MMA resin (Methyl Methacrylate), acrylic resin, silicone resin, polyester resin, and synthetic rubber resin (SBR / SBS).

[0052] It is preferable to provide one or more of the following: a benzotriazole-based high-performance ultraviolet (UV) absorber represented by the chemical formula C30H29N3O, which is an additive serving as a UV stabilizer; carbon black, which provides the function of absorbing sunlight → generating heat and raising the road surface temperature; graphite, which provides heat dispersion and uniform heat generation; and graphene nanoplatelets, which provide improved heat generation efficiency and enhanced durability, as carbon-based fillers.

[0053] The above TiN (Titanium Nitride) is configured to absorb sunlight → generate heat and enhance wear resistance, and Bi2S3 (Bismuth Sulfide) is configured to generate heat itself and emit mid- and far-infrared rays.

[0054] The above SiO2 (silica) is provided to improve road surface durability and skid resistance, Al2O3 (alumina) is provided to strengthen the coating layer strength and durability, and the curing agent is provided to ensure the mechanical stability of the layer. At this time, during the day, it has a function of generating heat by maximizing NIR (700~2500nm) absorption and ground thermal radiation (400~500W / m²). 2 By lowering the radiation amount of ), continuous snow removal, de-icing, and anti-freezing effects are provided.

[0055] In addition, at night, by implementing a function that reduces the rate of heat loss by lowering the emissivity through a low-radiation structure design of mid- and far-infrared (MIR / FIR), a 15-30% reduction in nighttime cooling speed is provided by delaying the nighttime freezing critical condition.

[0056] It is preferable that the graphene nanoplatelets have a number of layers ranging from 1 to 10 layers to control thermal conductivity and strength, and it is preferable that the TiN have an average particle size ranging from 20 nm to 100 nm to optimize heat generation efficiency.

[0057] The above photoreactive heating layer (230) can absorb sunlight → generate heat and emit infrared radiation → prevent freezing and enhance road safety.

[0058] The above-mentioned photoreactive heating layer (230) is preferably prepared by stirring for 25 minutes in a medium temperature (20℃~40℃) stirrer according to the mixing ratio, and then adding BPO-50 (curing agent) to the prepared material at a mixing ratio of 30:1 and stirring for 5 minutes. The curing agent used at this time can be in powder or liquid form, and BPO-50, BPO-70, softening agent, etc. can be used.

[0059] As shown in FIG. 4, the results of the heat generation performance test of the photoreactive heat layer in the multilayer structured road paving coating layer for purpose-based road construction according to the present invention are as follows: 0 min: reference temperature (0℃), 5 min: +10℃ increase, 10 min: +18℃ increase, 15 min: +25℃ increase, 20 min: +28℃ increase, and 30 min: +30℃ increase, indicating that the photoreactive heat layer (230) absorbs light to rapidly raise the temperature and maintains it stably for more than 30 minutes.

[0060] FIG. 5 is a graph showing the results of a test on the abrasion resistance of a filler in a multilayer road paving coating layer for purpose-based road construction according to the present invention.

[0061] In the coating layer for a multilayer road paving structure for purpose-based road construction according to the present invention, it can be confirmed that the amount of wear is significantly reduced when a filler (SiO2, Al2O3) is included. At this time, the composition is 100 parts by weight of binder resin + SiO2 (5~9 parts by weight) + Al2O3 (7~9 parts by weight) + curing agent (3~5 parts by weight), the test method is to use a Taber Abraser wear tester, the load is 1 kg, the rotation speed is 1000 cycles, and the measurement item is the amount of wear (mg).

[0062] It can be seen that the wear resistance is best when fillers are used in combination, as the amount of fillers is 50 mg, the amount of SiO2 alone is 30 mg, the amount of Al2O3 alone is 28 mg, and the amount of SiO2 + Al2O3 combined is 20 mg, which indicates that the durability of the road coating layer is greatly improved.

[0063] FIGS. 6 to 8 are images illustrating the actual application of a multilayer road paving coating layer for purpose-based road construction according to the present invention.

[0064] In the multilayer structured coating layer for road paving for purpose-based road construction according to the present invention, when the functional multilayer coating layer (200) includes a temperature visualization layer (210), a radiant heat blocking layer (220), and a photoreactive heating layer (230), as shown in FIGS. 6 to 8, text, designs, and colors such as an ice warning, a slippery warning, and a freezing warning are displayed on the surface due to freezing, thereby conveying visual information to road users through color changes, images, and text display, and thus preventing safety accidents from occurring.

[0065] In addition, to prevent slip accidents, traffic accidents, and falls caused by road icing, it delays road icing and achieves eco-friendly and continuous de-icing and snow removal effects.

[0066] The temperature visualization layer (210), radiant heat blocking layer (220), and photoreactive heating layer (230), which are functional multilayer coating layers (200), are sequentially laminated by spraying each layer, and depending on the surrounding environment and requirements, one or two of the temperature visualization layer (210), radiant heat blocking layer (220), and photoreactive heating layer (230) can be installed by spraying. That is, a multilayer can be formed.

[0067] Although the present invention has been described above based on the drawings, this is merely illustrative, and since various substitutions, modifications, and changes are possible within the scope of the technical concept of the invention, it is not limited to the aforementioned embodiments and drawings. Explanation of the symbols

[0068] 100: Road paving asphalt 200: Functional multi-layer coating 210: Temperature visualization layer 220: Radiation blocking layer 230: Photoreactive heating layer

Claims

Claim 1 A road paving asphalt (100) having an anti-slip functional layer (110) and a functional multilayer coating layer (200) having visualization, blocking, and heating functions provided on the upper part of the road paving asphalt, wherein the functional multilayer coating layer (200) comprises 100 parts by weight of a binder resin (one or more selected from epoxy resin, polyurethane resin, MMA resin, acrylic resin, silicone resin, polyester resin, and synthetic rubber resin (SBR / SBS)) having a temperature-sensitive color-changing function; 10 to 20 parts by weight each of a thermochromic pigment that reacts within the range of -35℃ to 75℃ and a thermochromic pigment of a different color; 5 to 14 parts by weight of a benzotriazole-based high-performance ultraviolet (UV) absorber represented by the chemical formula C30H29N3O; 3 to 12 parts by weight of TiO2 nanoparticles; and 5 parts by weight of ZnO nanoparticles. A multilayer road paving coating layer for purpose-based road construction, characterized by comprising a temperature visualization layer (210) comprising 7 to 10 parts by weight of a near-infrared (NIR) reflective pigment and 3 to 5 parts by weight of a curing agent, a radiant heat blocking layer (220) comprising a photocatalytic material that reflects, absorbs, and radiates near-infrared, infrared, visible light, and ultraviolet rays, and a photoreactive heating layer (230) that absorbs near-infrared, infrared, visible light, and ultraviolet rays to generate heat and emits low amounts of mid-infrared / far-infrared (MIR / FIR) rays. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 In claim 1, the radiant heat blocking layer (220) comprises 100 parts by weight of a binder resin (one or more selected from epoxy resin, polyurethane resin, MMA resin, acrylic resin, silicone resin, polyester resin, and synthetic rubber resin (SBR / SBS)); 10 to 20 parts by weight of TiO2 nanoparticles; 10 to 12 parts by weight of ZnO nanoparticles; 8 to 15 parts by weight of near-infrared (NIR) reflective pigment; and 3 to 5 parts by weight of a curing agent, characterized as a multilayer road paving coating layer for purpose-based road construction. Claim 6 A multilayer road paving coating layer for purpose-based road construction, characterized in that, in claim 5, the above TiO2 nanoparticles are composed of one or more selected from anatase-type TiO2 or rutile-type TiO2. Claim 7 A multilayer road paving coating layer for purpose-based road construction, characterized in that, in claim 5, the TiO2 nanoparticles are provided as anatase / rutile mixed type P25 TiO2. Claim 8 A multilayer road paving coating layer for purpose-based road construction, characterized in that, in claim 5, the NIR reflective pigment is composed of a white, gray, or blue pigment. Claim 9 A multilayer road paving coating layer for purpose-based road construction, characterized in that, in claim 5, the NIR reflective pigment is provided to have the function of reflecting near-infrared rays in the wavelength range of 700 nm to 2500 nm. Claim 10 A multilayer road paving coating layer for purpose-based road construction, characterized in that, in claim 5, the curing agent comprises one or more selected from amine-based curing agents or isocyanate-based curing agents. Claim 11 A multilayer road paving coating layer for purpose-based road construction, characterized in that, in claim 5, the ZnO nanoparticles are provided to have an average particle size of 20 nm to 50 nm. Claim 12 delete Claim 13 In claim 1, the photoreactive heating layer (230) comprises 100 parts by weight of a binder resin (one or more selected from epoxy resin, polyurethane resin, MMA resin, acrylic resin, silicone resin, polyester resin, and synthetic rubber resin (SBR / SBS); 5 to 12 parts by weight of a benzotriazole-based high-performance ultraviolet (UV) absorber represented by the chemical formula C30H29N3O; 10 to 15 parts by weight of carbon black; 8 to 12 parts by weight of graphite; 5 to 10 parts by weight of graphene nanoplatelets; 5 to 8 parts by weight of TiN; 3 to 6 parts by weight of Bi2S3; 5 to 9 parts by weight of SiO2; 7 to 9 parts by weight of Al2O3; and 3 to 5 parts by weight of a curing agent, characterized in that it is a multilayer road paving coating layer for purpose-based road construction. Claim 14 delete Claim 15 In claim 13, the coating layer for a multilayer road pavement structure for purpose-based road construction is characterized in that the TiN has an average particle size in the range of 20 nm to 100 nm. Claim 16 A multilayer road paving coating layer for purpose-based road construction, characterized in that, in claim 13, the graphene nanoplatelets are provided to have a number of layers ranging from 1 to 10.

Images