Radiant heating and cooling uniform coating and method of making same

Abstract

The application discloses a kind of radiant heating and cooling with heat equalizing coating and preparation method thereof, belong to the field of coating technology.The application uses water-based epoxy resin emulsion, water-based epoxy resin curing agent, high thermal conductivity graphite, alpha-aluminum oxide, copper fiber, steel fiber and polypropylene fiber as main raw materials, water-based epoxy resin emulsion and curing agent are reacted to form thermosetting resin matrix with high bonding strength and weather resistance, provide stable support structure for coating;High thermal conductivity graphite and alpha-aluminum oxide as main heat conduction framework, ensure the efficient diffusion of heat in the plane direction;Copper fiber and steel fiber are overlapped in the coating, which significantly improves the heat diffusion efficiency in the plane and thickness direction, avoids local heat accumulation;Polypropylene fiber limits microcrack propagation through bridging effect, enhances the toughness and crack resistance of the coating, ensures the long-term stability of the contact interface of the heat-conducting filler, and finally makes the coating have excellent heat equalizing ability, mechanical strength and corrosion resistance.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, and in particular relates to a heat-dampening coating for radiant heating and cooling and its preparation method. Background Technology

[0002] Radiant heating and cooling systems embed heat sources (hot or cold water, or heating cables) within or on the surface of the insulation layer. Heat is then transferred to the surface through heat transfer materials to achieve uniform heating or cooling, maintaining a relatively constant temperature within the space. The JGJ142-2012 standard, "Technical Specification for Radiant Heating and Cooling," specifies requirements for heat equalization materials: the thickness of the heat equalization material used in precast grooved insulation boards should be 0.1-0.4 mm, and the surface must be coated with an organic polymer and a mortar-resistant anti-corrosion material. Furthermore, in actual construction, for non-precast grooved boards, a reflective film is often laid on the insulation layer to achieve heat equalization. Common materials include double-sided coated thin aluminum, with an overall thickness not exceeding 0.05 mm and an aluminum layer thickness of 0.01-0.02 mm. In addition, common radiant heating and cooling systems also use mushroom-shaped floor heating panels (also known as EPS mushroom panels), which are integrated insulation modules designed specifically for dry or no-backfill floor heating systems. They are formed by steam foaming EPS raw materials, with regular mushroom-shaped protrusions on the surface to form natural pipe grooves. They can be directly embedded with 16mm or 20mm floor heating pipes without additional clips. To increase the strength and waterproof performance of the mushroom head, the product surface is coated with an aluminum reflective film or an organic film layer.

[0003] However, the existing heat spreaders have the following defects and shortcomings: 1) Insufficient heat spreader capacity: The heat transfer path of existing aluminum heat spreaders is relatively simple, and the aluminum material is thin, resulting in reduced heat transfer efficiency. In practical applications, when the system is started or the temperature is adjusted, the heat spreader cannot quickly diffuse the energy of the heat source to the entire coverage area, resulting in local overheating or undercooling. For example, in residential heating scenarios, the temperature of the ground area near the underfloor heating pipes may reach above 26℃, while the temperature of the area far from the pipes is only around 20℃, resulting in a large temperature difference and affecting living comfort. 2) High cost: Most of the heat spreaders involved in the JGJ142-2012 "Technical Specification for Radiant Heating and Cooling" standard on the market are based on metallic aluminum with a protective layer attached to the surface. Based on the current aluminum price of 25 yuan / kg, the cost range of metallic aluminum per unit area is as follows: 0.1mm thickness, 6.75 yuan; 0.2mm thickness, 13.50 yuan; 0.3mm thickness, 20.25 yuan; 0.4mm thickness, 27.00 yuan. Adding manufacturing costs, the price will increase by 80-100%, and this high price limits the application of metal heat spreaders. 3) Insufficient corrosion resistance: Metal heat spreaders used in radiant heating and cooling systems are continuously corroded by the backfill layer, external moisture, oxygen in the air, and adhesives during operation. Especially when the backfill layer is cement-based, common pure aluminum reflective films will corrode completely within a few months. In relatively humid environments, even with a 0.2mm thick aluminum layer, significant corrosion or even perforation may occur within 3-10 years. Continuous corrosion leads to a significant decrease in heat spreader performance, preventing it from achieving the same lifespan as other components. 4) Complex Structure and Defects: In actual production, the prefabricated grooved insulation boards specified in JGJ 142-2012 "Technical Specification for Radiant Heating and Cooling" require the use of adhesives to bond the heat spreader layer to the insulation substrate. However, these adhesives can damage both the heat spreader layer and the insulation substrate. Furthermore, at the corners of the grooves in the prefabricated grooved insulation boards, the insufficient ductility of the material prevents the heat spreader layer from achieving complete coverage. Therefore, there is an urgent need for a heat spreader material with excellent heat spreader capacity, low cost, good corrosion resistance, and easy operation to solve these technical problems. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention proposes a heat-equalizing coating for radiant heating and cooling and its preparation method.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a heat equalization coating for radiant heating and cooling, comprising the following raw materials in parts by weight: 24-35 parts of waterborne epoxy resin emulsion, 15-20 parts of waterborne epoxy resin curing agent, 15-30 parts of high thermal conductivity graphite, 6-15 parts of water, 5-10 parts of α-alumina, 5-10 parts of copper fiber, 3-10 parts of steel fiber, 0-10 parts of cement, 1-10 parts of quartz sand, 1-5 parts of polypropylene fiber, 0.5-2 parts of wetting agent, and 0.5-2 parts of rheology modifier.

[0006] Furthermore, the heat-equalizing coating for radiant heating and cooling comprises the following raw materials in parts by weight: 24-27 parts of waterborne epoxy resin emulsion, 16-18 parts of waterborne epoxy resin curing agent, 20-30 parts of high thermal conductivity graphite, 9-10 parts of water, 5-6 parts of α-alumina, 6-10 parts of copper fiber, 3-8 parts of steel fiber, 0-5 parts of cement, 2-6 parts of quartz sand, 1-3 parts of polypropylene fiber, 0.5-1 part of wetting agent, and 0.5-1 part of rheology modifier.

[0007] Furthermore, the solid content of the aqueous epoxy resin emulsion is 40-60%, and the epoxy equivalent is 380-460 g / eq.

[0008] Furthermore, the waterborne epoxy resin curing agent is a waterborne amine curing agent with an active hydrogen equivalent of 260-300.

[0009] Furthermore, the high thermal conductivity graphite has a particle size of 20-50 μm and a thermal conductivity of 500-800 W / (m·K).

[0010] Furthermore, the copper fiber has a length of 3-6 mm and a diameter of 100-200 μm; the steel fiber has a length of 3-6 mm and a diameter of 100-200 μm; and the polypropylene fiber has a length of 3-5 mm and a diameter of 100-150 μm.

[0011] Furthermore, the particle size of the α-alumina is 10~20μm; the particle size of the quartz sand is 180-220 mesh.

[0012] The present invention also provides a method for preparing a heat-equalizing coating for radiant heating and cooling as described in the above technical solution, comprising the following steps: After mixing the waterborne epoxy resin curing agent and the waterborne epoxy resin emulsion, water, quartz sand, wetting agent, rheology modifier, high thermal conductivity graphite, cement, and α-alumina are added in sequence and stirred evenly to obtain a mixture. Copper fiber, steel fiber and polypropylene fiber are mixed evenly to obtain a fiber mixture; The fiber mixture is added to the mixture to obtain a coating; The coating is applied to a substrate and allowed to cure under static conditions to form a heat-spreading coating for radiant heating and cooling.

[0013] Furthermore, the coating method is either coating or spraying; The static curing temperature is 20-30℃, and the time is 12-48h.

[0014] Compared with the prior art, the present invention has the following advantages and technical effects: This invention uses waterborne epoxy resin emulsion, waterborne epoxy resin curing agent, high thermal conductivity graphite, α-alumina, copper fiber, steel fiber, and polypropylene fiber as main raw materials. The waterborne epoxy resin emulsion reacts with the curing agent to form a thermosetting resin matrix with high bonding strength and weather resistance, providing a stable support structure for the coating. High thermal conductivity graphite and α-alumina serve as the main thermally conductive framework, forming a multi-point contact structure to ensure efficient heat diffusion in the planar direction. Simultaneously, the incorporated copper and steel fibers overlap within the coating, forming linear thermally conductive channels that run through the thickness direction, thus constructing a continuous three-dimensional thermally conductive network. This significantly improves the in-plane and thickness-direction heat diffusion efficiency and avoids localized heat accumulation. Furthermore, the polypropylene fibers limit microcrack propagation through bridging, enhancing the coating's toughness and crack resistance, ensuring the long-term stability of the thermally conductive filler contact interface, and ultimately giving the coating excellent heat dissipation capacity, mechanical strength, and corrosion resistance.

[0015] The heat-dissipating coating provided by this invention forms a continuous contact interface when in contact with the insulation substrate, allowing for a more uniform distribution of heat or cold across the coating's planar direction, thereby reducing contact thermal resistance. Furthermore, this heat-dissipating coating exhibits excellent corrosion resistance to acids, alkalis, and salts, ensuring long-term stability in concrete. Its heat-dissipating performance does not decline over time, achieving a lifespan comparable to other HVAC components. In contrast, aluminum-based heat-dissipating materials experience gradual corrosion of the aluminum layer over several months to years, leading to a continuous decrease in heat-dissipating capacity and premature failure compared to other HVAC components. Moreover, the heat-dissipating coating provided by this invention is simple to apply; it can be sprayed or coated onto the substrate surface, achieving comprehensive coverage and compensating for the shortcomings of aluminum-based coatings. Attached Figure Description

[0016] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a photograph of the heat-equalizing coating for radiant heating and cooling formed on the surface of the XPS insulation board in Example 1. Figure 2 This is a top view of the heat-spreading coating for radiant heating and cooling formed on the surface of the XPS insulation board in Example 1. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] This invention provides a heat-equalizing coating for radiant heating and cooling, comprising the following raw materials in parts by weight: 24-35 parts of waterborne epoxy resin emulsion, 15-20 parts of waterborne epoxy resin curing agent, 15-30 parts of high thermal conductivity graphite, 6-15 parts of water, 5-10 parts of α-alumina, 5-10 parts of copper fiber, 3-10 parts of steel fiber, 0-10 parts of cement, 1-10 parts of quartz sand, 1-5 parts of polypropylene fiber, and 0. 5-2 parts and rheology modifier 0.5-2 parts; more preferably: 24-27 parts of waterborne epoxy resin emulsion, 16-18 parts of waterborne epoxy resin curing agent, 20-30 parts of high thermal conductivity graphite, 9-10 parts of water, 5-6 parts of α-alumina, 6-10 parts of copper fiber, 3-8 parts of steel fiber, 0-5 parts of cement, 2-6 parts of quartz sand, 1-3 parts of polypropylene fiber, 0.5-1 part of wetting agent and 0.5-1 part of rheology modifier.

[0020] In a preferred embodiment, the waterborne epoxy resin emulsion has a solid content of 40-60% and an epoxy equivalent of 380-460 g / eq; the waterborne epoxy resin emulsion was purchased from Shanghai Benzene New Material Technology Co., Ltd. The waterborne epoxy resin emulsion in this invention forms a cured epoxy resin body under the curing action of a waterborne epoxy resin curing agent. This serves as the main adhesive component of the coating, ensuring the bonding strength between the coating and the substrate, and ensuring that the coating mixture can be cured and formed at room temperature or a certain temperature. Furthermore, epoxy resin is a thermosetting material with high strength, acid resistance, alkali resistance, weather resistance, and non-absorbency, which is beneficial for improving the corrosion resistance of the coating.

[0021] In a preferred embodiment, the waterborne epoxy resin curing agent is a waterborne amine curing agent with an active hydrogen equivalent of 260-300; the waterborne epoxy resin curing agent was purchased from Shanghai Primary Amine New Materials Technology Co., Ltd.

[0022] In a preferred embodiment, the high thermal conductivity graphite has a particle size of 20-50 μm and a thermal conductivity of 500-800 W / (m·K). This invention utilizes high thermal conductivity graphite with excellent heat transfer properties, which is distributed in a sheet-like or irregular manner within the coating. This results in a coating with high thermal conductivity in the planar direction and forms a multi-point contact structure with α-alumina, facilitating rapid heat diffusion in the in-plane direction.

[0023] In a preferred embodiment, the copper fiber has a length of 3-6 mm and a diameter of 100-200 μm. The copper fiber in this invention has excellent thermal conductivity, which can significantly improve the thermal diffusion capability of the coating in the planar direction.

[0024] In a preferred embodiment, the steel fibers are 3-6 mm in length and 100-200 μm in diameter. The copper and steel fibers form interwoven linear heat-conducting channels in the coating, thereby constructing a continuous heat conduction network. This improves the planar heat diffusion capability, effectively reduces heat accumulation in local areas, and enhances the product's impact resistance.

[0025] In a preferred embodiment, the polypropylene fibers have a length of 3-5 mm and a diameter of 100-150 μm. The polypropylene fibers act as a reinforcing agent in the coating, improving the toughness and crack resistance of the substrate by limiting the propagation of microcracks, while also helping to maintain stable contact between the thermally conductive fillers.

[0026] In a preferred embodiment, the particle size of the α-alumina is 10-20 μm. As the main thermally conductive filler, α-alumina, with its high thermal conductivity, excellent acid and alkali resistance, high temperature resistance (melting point > 2050℃), and oxidation and weather resistance, forms a dense distribution in the coating thickness and in-plane direction, thereby effectively shortening the heat transfer path in the solid phase.

[0027] In a preferred embodiment, the quartz sand has a particle size of 180-220 mesh. The quartz sand in this invention is used to improve the hardness and wear resistance of the coating.

[0028] In a preferred embodiment, the cement is 42.5 grade ordinary Portland cement. The cement forms an inorganic phase structure in the coating, working synergistically with the resin skeleton to not only provide sufficient strength and durability to ensure panel stability, but also reduce material costs and improve adaptability in cement-based environments.

[0029] In a preferred embodiment, the wetting agent is purchased from BYK Additives (Shanghai) Co., Ltd., model number BYK-151. The wetting agent in this invention is used to improve the flowability and dispersibility of the coating mixture, ensuring that the raw materials can be uniformly mixed.

[0030] In a preferred embodiment, the rheology modifier is purchased from BYK Additives (Shanghai) Co., Ltd., model number PHEOBYK-D 410. The rheology modifier in this invention is used to improve the thixotropy of the coating during application, ensure application flowability, increase viscosity, prevent sagging and dripping, and ensure uniform coating thickness.

[0031] The present invention also provides a method for preparing a heat-equalizing coating for radiant heating and cooling as described in the above technical solution, comprising the following steps: After mixing the waterborne epoxy resin curing agent and the waterborne epoxy resin emulsion, water, wetting agent, rheology modifier, high thermal conductivity graphite, cement, and α-alumina are added in sequence and stirred evenly to obtain a mixture. Copper fiber, steel fiber and polypropylene fiber are mixed evenly to obtain a fiber mixture; The fiber mixture is added to the mixture to obtain a coating; The coating is applied to a substrate and allowed to cure under static conditions to form a heat-spreading coating for radiant heating and cooling.

[0032] In a preferred embodiment, the waterborne epoxy resin curing agent and the waterborne epoxy resin emulsion are mixed by stirring; the stirring speed is 400-1000 r / min, and the stirring time is 10-15 min.

[0033] In a preferred embodiment, after adding the fiber mixture to the mixture, a step of re-stirring is further included; the re-stirring speed is 300-500 r / min, and the re-stirring time is 10-15 min.

[0034] In a preferred embodiment, the coating method is coating or spraying; the spraying pressure is 0.2-0.8 MPa.

[0035] In a preferred embodiment, the static curing temperature is 20-30°C and the time is 12-48 hours.

[0036] In this embodiment of the invention, room temperature refers to "25±2℃".

[0037] Unless otherwise specified, all raw materials used in the embodiments of this invention were purchased through commercial channels.

[0038] Example 1 A heat-equalizing coating for radiant heating and cooling is composed of the following raw materials in parts by weight: 27 parts waterborne epoxy resin emulsion, 18 parts waterborne epoxy resin curing agent, 20 parts high thermal conductivity graphite, 10 parts water, 6 parts α-alumina, 6 parts copper fiber, 3 parts steel fiber, 5 parts cement, 6 parts quartz sand, 1 part polypropylene fiber, 0.5 parts wetting agent (BYK-151), and rheology modifier (PHEOBYK-D). 410) 0.5 parts; wherein, the solid content of the waterborne epoxy resin emulsion is 40%, and the epoxy equivalent is 380 g / eq; the active hydrogen equivalent of the waterborne epoxy resin curing agent is 260; the particle size of the high thermal conductivity graphite is 20 μm, and the thermal conductivity is 500 W / (m·K); the length of the copper fiber is 3 mm, and the diameter is 100 μm; the length of the steel fiber is 3 mm, and the diameter is 100 μm; the length of the polypropylene fiber is 3 mm, and the diameter is 100 μm; the particle size of α-alumina is 10 μm; and the particle size of the quartz sand is 180 mesh; The specific steps for preparing the above-mentioned heat-equalizing coating for radiant heating and cooling are as follows: The waterborne epoxy resin curing agent and the waterborne epoxy resin emulsion were mixed and stirred at 500 r / min for 15 min. Then, water, quartz sand, wetting agent, rheology modifier, high thermal conductivity graphite, cement and α-alumina were added in sequence and stirred evenly to obtain a mixture. Copper fiber, steel fiber and polypropylene fiber are mixed evenly to obtain a fiber mixture; Add the fiber mixture to the mixture and stir at 350 r / min for 10 min to obtain the coating; Cut XPS insulation boards to 30cm×25cm×2cm (length×width×height), ensuring the surface is flat, smooth, and free of impurities and oil. Pour the coating into the applicator, set the coating thickness to 1mm, and apply the coating to the surface of the XPS insulation board. Place the coated XPS insulation board in an environment of 20-30℃ and let it stand for 24 hours, avoiding collisions and shaking during the process. After standing, a heat-equalizing coating for radiant heating and cooling will be formed on the surface of the XPS insulation board.

[0039] Figure 1 This is a photograph of the heat-equalizing coating for radiant heating and cooling formed on the surface of the XPS insulation board in Example 1. Figure 2 This is a top view of the heat-dampening coating for radiant heating and cooling formed on the surface of the XPS insulation board in Example 1. From Figure 1 and Figure 2 It can be seen that the heat-spreading coating is evenly applied to the substrate surface, with good flatness.

[0040] Example 2 A heat-equalizing coating for radiant heating and cooling is composed of the following raw materials in parts by weight: 24 parts waterborne epoxy resin emulsion, 16 parts waterborne epoxy resin curing agent, 30 parts high thermal conductivity graphite, 9 parts water, 5 parts α-alumina, 6 parts copper fiber, 3 parts steel fiber, 2 parts quartz sand, 1 part polypropylene fiber, 0.5 parts wetting agent (BYK-151), and rheology modifier (PHEOBYK-D). 410) 0.5 parts; wherein, the solid content of the waterborne epoxy resin emulsion is 45%, and the epoxy equivalent is 390 g / eq; the active hydrogen equivalent of the waterborne epoxy resin curing agent is 280; the particle size of the high thermal conductivity graphite is 30 μm, and the thermal conductivity is 600 W / (m·K); the length of the copper fiber is 3 mm, and the diameter is 150 μm; the length of the steel fiber is 3 mm, and the diameter is 150 μm; the length of the polypropylene fiber is 3 mm, and the diameter is 150 μm; the particle size of α-alumina is 15 μm; and the particle size of the quartz sand is 200 mesh; The specific steps for preparing the above-mentioned heat-equalizing coating for radiant heating and cooling are as follows: The waterborne epoxy resin curing agent and the waterborne epoxy resin emulsion were mixed and stirred at 600 r / min for 10 min. Then, water, quartz sand, wetting agent, rheology modifier, high thermal conductivity graphite and α-alumina were added in sequence and stirred evenly to obtain a mixture. Copper fiber, steel fiber and polypropylene fiber are mixed evenly to obtain a fiber mixture; The fiber mixture is added to the mixture and stirred at 300 r / min for 15 min to obtain the coating. Cut XPS insulation boards to 80cm×60cm×2cm (length×width×height), ensuring the surface of the XPS insulation boards is flat, smooth, and free of impurities and oil stains; add the paint to the spraying machine, adjust the pressure of the spraying machine to 0.5MPa, and spray the paint onto the surface of the XPS insulation boards to a thickness of 1mm; Place the sprayed XPS insulation board in an environment of 20-30℃ and let it stand for 24 hours, avoiding collisions and shaking during the process. After standing, a heat-equalizing coating for radiant heating and cooling will be formed on the surface of the XPS insulation board.

[0041] The vertical thermal conductivity and horizontal heat transfer per unit length of the thin aluminum and the homogeneous coatings obtained in Examples 1-2 were tested using a steady-state method. The method in GB / T 10125-2021 "Artificial Atmosphere Corrosion Test - Salt Spray Test" was adopted, with a test time of 48 hours. Acetic acid salt spray was selected to test the acid resistance of the thin aluminum and the homogeneous coatings obtained in Examples 1-2. The alkali resistance of the thin aluminum and the homogeneous coatings obtained in Examples 1-2 was tested by static immersion in 5% NaOH solution at 25℃ for 96 hours. The impact resistance of the thin aluminum and the homogeneous coatings obtained in Examples 1-2 was tested according to GB-T 45011-2024 "Fiber Reinforced Composite Materials - Impact Failure Test Method". The wear resistance of the homogeneous coatings obtained in Examples 1-2 was tested according to GB / T 22374-2018 "Floor Coating Materials". The results are shown in Table 1.

[0042] Table 1 As shown in Table 1, the thermal conductivity of the heat-spreading coating obtained in Example 1 is approximately 1.17 times that of 0.1mm thin aluminum in the vertical direction, and 11.67 times that of 0.1mm thin aluminum in the horizontal direction, while the cost is only one-third to one-quarter of that of thin aluminum. Similarly, the heat-spreading coating obtained in Example 2 has a heat transfer of 10.95 times that of 0.1mm thin aluminum in the horizontal direction, while the cost is only one-third to one-quarter of that of thin aluminum. Therefore, the heat-spreading coating provided by this invention has excellent heat-spreading performance and reduces costs.

[0043] Comparative Example 1 A heat-equalizing coating for radiant heating and cooling differs from Example 1 only in that the waterborne epoxy resin emulsion is replaced with an equal weight of waterborne acrylic resin emulsion, and the waterborne epoxy resin curing agent is replaced with an equal weight of waterborne isocyanate curing agent; otherwise, it is the same as Example 1.

[0044] Comparative Example 2 A heat-equalizing coating for radiant heating and cooling differs from Example 1 only in that steel fibers are replaced with an equal weight proportion of copper fibers; otherwise, they are the same as in Example 1.

[0045] Comparative Example 3 A heat-equalizing coating for radiant heating and cooling differs from Example 1 only in that polypropylene fibers are replaced with copper fibers in equal weight proportions, otherwise the same as Example 1.

[0046] Comparative Example 4 A heat-equalizing coating for radiant heating and cooling differs from Example 1 only in that steel fibers and polypropylene fibers are replaced with copper fibers in equal weight proportions, otherwise the same as Example 1.

[0047] Comparative Example 5 A heat-equalizing coating for radiant heating and cooling differs from Example 1 only in that α-alumina is replaced with an equal weight proportion of high thermal conductivity graphite, otherwise it is the same as Example 1.

[0048] The vertical thermal conductivity, horizontal heat transfer per unit length, acid and alkali resistance, impact resistance and abrasion resistance of the heat-spreading coatings obtained in Comparative Examples 1-5 were tested using the same method as in Example 1. The results are shown in Table 2.

[0049] Table 2 As shown in Table 2, replacing the binder reduces the material's impact resistance and horizontal and vertical heat transfer capacity. Replacing the fiber and α-alumina reduces the heat transfer capacity of the heat-dampening coating, and other properties also decrease. The cost increases significantly compared to the example.

[0050] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A heat-equalizing coating for radiant heating and cooling, characterized in that, The raw materials include the following parts by weight: 24-35 parts of waterborne epoxy resin emulsion, 15-20 parts of waterborne epoxy resin curing agent, 15-30 parts of high thermal conductivity graphite, 6-15 parts of water, 5-10 parts of α-alumina, 5-10 parts of copper fiber, 3-10 parts of steel fiber, 0-10 parts of cement, 1-10 parts of quartz sand, 1-5 parts of polypropylene fiber, 0.5-2 parts of wetting agent, and 0.5-2 parts of rheology modifier.

2. The heat-equalizing coating for radiant heating and cooling according to claim 1, characterized in that, The heat-equalizing coating for radiant heating and cooling comprises the following raw materials in parts by weight: 24-27 parts of waterborne epoxy resin emulsion, 16-18 parts of waterborne epoxy resin curing agent, 20-30 parts of high thermal conductivity graphite, 9-10 parts of water, 5-6 parts of α-alumina, 6-10 parts of copper fiber, 3-8 parts of steel fiber, 0-5 parts of cement, 2-6 parts of quartz sand, 1-3 parts of polypropylene fiber, 0.5-1 part of wetting agent, and 0.5-1 part of rheology modifier.

3. The heat-equalizing coating for radiant heating and cooling according to claim 1, characterized in that, The solid content of the aqueous epoxy resin emulsion is 40-60%, and the epoxy equivalent is 380-460 g / eq.

4. The heat-equalizing coating for radiant heating and cooling according to claim 1, characterized in that, The waterborne epoxy resin curing agent is a waterborne amine curing agent with an active hydrogen equivalent of 260-300.

5. The heat-equalizing coating for radiant heating and cooling according to claim 1, characterized in that, The high thermal conductivity graphite has a particle size of 20-50 μm and a thermal conductivity of 500-800 W / (m·K).

6. The heat-equalizing coating for radiant heating and cooling according to claim 1, characterized in that, The copper fiber has a length of 3-6 mm and a diameter of 100-200 μm; the steel fiber has a length of 3-6 mm and a diameter of 100-200 μm; the polypropylene fiber has a length of 3-5 mm and a diameter of 100-150 μm.

7. The heat-equalizing coating for radiant heating and cooling according to claim 1, characterized in that, The α-alumina has a particle size of 10-20 μm; the quartz sand has a particle size of 180-220 mesh.

8. A method for preparing a heat-equalizing coating for radiant heating and cooling as described in any one of claims 1-7, characterized in that, Includes the following steps: After mixing the waterborne epoxy resin curing agent and the waterborne epoxy resin emulsion, water, quartz sand, wetting agent, rheology modifier, high thermal conductivity graphite, cement, and α-alumina are added in sequence and stirred evenly to obtain a mixture. Copper fiber, steel fiber and polypropylene fiber are mixed evenly to obtain a fiber mixture; The fiber mixture is added to the mixture to obtain a coating; The coating is applied to a substrate and allowed to cure under static conditions to form a heat-spreading coating for radiant heating and cooling.

9. The preparation method according to claim 8, characterized in that, The coating method is either coating or spraying; The static curing temperature is 20-30℃, and the time is 12-48h.

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