Water-based radiation refrigeration coating composition and preparation process thereof

Abstract

The invention relates to the technical field of water-based radiation refrigeration coatings, and discloses a water-based radiation refrigeration coating composition and a preparation process thereof, the water-based radiation refrigeration coating composition comprises a component A and a component B, the component A is prepared from the following raw materials in parts by weight: 10 to 15 parts of a water-based substrate, 8 to 12 parts of a multi-effect cosolvent, 55 to 65 parts of radiation refrigeration functional filler, 10 to 20 parts of emulsion, 0.1 to 0.8 part of a hydrophobic auxiliary agent, 0.1 to 0.8 part of a wetting agent and 0.3 to 1 part of a thickening agent, and the multi-effect cosolvent is prepared from a dispersing agent, a defoaming agent and a first solvent; and the component B comprises the following raw materials in parts by weight: 65-75 parts of a curing agent and 25-35 parts of a second solvent. The water-based radiation refrigeration coating composition has good cooling performance, weather resistance and protection performance.

Description

Technical Field

[0001] This invention relates to the field of waterborne radiative cooling coating technology, and in particular to a waterborne radiative cooling coating composition and its preparation process. Background Technology

[0002] With rapid socio-economic development, the demand for electricity in social production and daily life continues to grow, highlighting the increasing importance of power transmission and distribution. Various power equipment, such as prefabricated substations, ring main units, distribution cabinets, and switchgear, are widely deployed and used. These power devices are often exposed to outdoor sunlight for extended periods, and are subject to multiple factors including direct solar radiation, high ambient temperatures, and heat generated during operation. This causes a rapid increase in the surface temperature of their metal casings, posing an increasingly severe challenge to thermal management. Radiative cooling technology is a passive cooling technique that uses optical modulation in specific wavelengths to enable objects to spontaneously radiate heat into the cold universe, achieving a cooling effect. Applying radiative cooling technology to power equipment scenarios is currently an important research direction for solving the thermal management problems of outdoor power equipment.

[0003] However, the application of radiation cooling technology to power equipment scenarios currently faces many limitations: due to the long-term exposure of power equipment casings to harsh outdoor environments such as wind, rain, ultraviolet radiation, and pollutants, existing radiation cooling coatings generally suffer from poor adhesion, weak stain resistance, easy chalking, and poor resistance to ultraviolet aging, making it difficult to maintain the optical properties and radiation cooling effect of the coatings for a long time; in addition, the design of existing radiation cooling coatings focuses on cooling performance and does not fully consider other properties necessary for their use as external protective coatings for power equipment, such as corrosion resistance and mechanical strength. Summary of the Invention

[0004] To address the technical problems of insufficient environmental adaptability and durability and limited overall performance of the aforementioned radiation cooling coatings, this invention provides a water-based radiation cooling coating composition with good cooling performance, weather resistance, and protective properties.

[0005] The specific technical solution of the present invention is as follows: an aqueous radiation cooling coating composition, comprising component A and component B, wherein component A comprises the following raw materials in parts by weight: 10-15 parts of aqueous base, 8-12 parts of multi-functional co-solvent, 55-65 parts of radiation cooling functional filler, 10-20 parts of emulsion, 0.1-0.8 parts of hydrophobic additive, 0.1-0.8 parts of wetting agent and 0.3-1 parts of thickener, wherein the multi-functional co-solvent comprises a dispersant, a defoamer and a first solvent; Component B comprises the following raw materials in parts by weight: 65-75 parts of curing agent and 25-35 parts of second solvent.

[0006] The water-based radiation cooling coating of the present invention is composed of component A and component B in a synergistic compound. Component A is the core functional carrier of the coating, integrating the core characteristics of radiation cooling, basic protection and environmental compatibility. Component B stabilizes the overall performance of the coating through a curing reaction and significantly improves the long-term stability of the coating.

[0007] Optionally, in the multi-effect cosolvent, the active ingredient of the dispersant is selected from organic modified polyacrylate containing pigment affinity groups or block copolymer containing pigment affinity groups; the active ingredient of the defoamer is selected from one of polyether siloxane copolymer emulsion, acetylenol, polymer composite mineral oil, and organosilicon compound; and the first solvent is selected from one or more of ethylene glycol butyl ether, dipropylene glycol butyl ether, and diethylene glycol dimethyl ether.

[0008] Optionally, the radiative cooling filler is selected from one or more of barium sulfate, rare earth oxides, ceramic powder, alumina, boron nitride, and nano-silica.

[0009] Optionally, the emulsion is selected from one or more of styrene-acrylic emulsions, polyurethane dispersions, and fluorocarbon emulsions.

[0010] Optionally, the active ingredient of the hydrophobic additive is selected from one or more of the following: modified hydroxyl-functionalized polydimethylsiloxane solution, silicon-fluorine complex, and zinc oxide suspension.

[0011] Optionally, the active ingredient of the wetting agent is selected from one or more of the following: organosilicon twin-structure surfactants, sodium dodecylbenzene sulfonate, fluoroalkyl polyoxyethylene ethers, and polyurethane modified polymers.

[0012] Optionally, the active ingredient of the thickener is selected from one or more of nonionic polyurethane polymers and alkali-swellable acrylic associative thickeners.

[0013] Optionally, the active ingredient of the curing agent is isocyanate, and the second solvent is 1,2-propanediol diacetate.

[0014] Another specific technical solution of the present invention is: a preparation process of an aqueous radiative cooling coating composition, wherein component A and component B are mixed to obtain an aqueous radiative cooling coating composition, wherein the preparation process of component A includes: mixing an aqueous substrate with a multi-functional co-solvent and a radiative cooling functional filler to obtain a slurry, mixing the slurry with an emulsion, a hydrophobic additive and a wetting agent, and then adding a thickener to adjust the viscosity of the system to between 80 and 90 KU to obtain component A; the preparation process of component B includes: mixing and dissolving a curing agent with a second solvent to obtain component B.

[0015] In the above preparation process, the components are added in sequence and mixed step by step to ensure that each component fully exerts its synergistic effect, ultimately making the coating have efficient radiation cooling, excellent protective performance, environmental protection with low VOCs, and convenient construction, which is suitable for the use of outdoor power equipment.

[0016] Optionally, the components A and B are mixed at a mass ratio of 15 to 20:1.

[0017] Specifically, the preparation process of component A is as follows: First, add 10-15 parts by weight of deionized water to a container, turn on a high-speed disperser and stir. Add a multi-effect co-solvent at 300-500 rpm and stir for 5-8 minutes. Then add a radiation cooling filler and disperse at 2000 rpm for 30 minutes to obtain a slurry. Add the emulsion to a container, fix it on a disperser, turn on the high-speed disperser and stir. Add the dispersed slurry at 300 rpm, then adjust the speed to 500-800 rpm and disperse for 3-5 minutes. Add a hydrophobic agent and a wetting agent and mix. Then add a thickener to adjust the viscosity to between 80-90 KU. Then filter through a 100-mesh silk bag to remove impurities, package, and seal.

[0018] Specifically, the preparation process of component B is as follows: first, add the curing agent to the container, then add the second solvent and stir to disperse evenly, and complete the dissolution.

[0019] Compared with the prior art, the present invention has at least the following advantages: (1) This invention adds high emissivity materials such as rare earth oxides, alumina, nano silica, barium sulfate, ceramic powder, and boron nitride to the coating, while various inorganic fillers form an irregular microstructure on the coating surface. The surface microstructure scatters sunlight, making the coating have high solar reflectivity and high emissivity, so that the emitted energy is greater than the absorbed energy, and the coating surface temperature is lower than the ambient temperature. This can effectively reduce the surface and internal temperature of outdoor power equipment. (2) The coating formulation of the present invention does not contain heavy metal elements, has no toxic or harmful substances, and the volatile harmful substances are far below the national standard requirements. It is an environmentally friendly coating, and the coating is a water-based system, which is environmentally friendly, pollution-free, and easy to apply. (3) The coating formulation of the present invention uses specific emulsions and inorganic fillers to enable the coating to resist aging factors such as strong outdoor ultraviolet rays and temperature changes, avoid cracking, chalking, discoloration and other problems, improve the weather resistance of the coating, and ensure its long-term stable service. (4) In the coating formulation of the present invention, the hydrophobic additives combined with the high-density coating structure enable the coating to have excellent hydrophobicity, which can reduce the adhesion of rainwater and pollutants on the surface, avoid the decrease in reflectivity due to dirt coverage, and reduce the risk of corrosion in humid environments, making it suitable for the harsh conditions of outdoor wind, rain and pollutant erosion. (5) In the coating formulation of the present invention, the continuous coating film formed by the emulsion is tightly bonded to the metal substrate of the power equipment. With the interface optimization effect of the wetting agent, the coating adhesion reaches level 1 by cross-cut test. At the same time, the synergistic effect of the filler and the emulsion makes the coating pencil hardness reach 2H, which has good wear resistance and impact resistance. It can resist physical damage such as outdoor bumps and wind and sand erosion. It not only achieves the cooling function, but also undertakes the protective function of the equipment shell, making up for the shortcomings of existing radiation cooling coatings that "emphasize cooling and neglect protection". (5) Multi-effect cosolvents significantly improve the dispersion performance of functional heat dissipation fillers in coatings and ensure coating density, providing technical support for significantly improving coating reflectivity, emissivity and protective performance; (6) This invention scientifically proportions the raw material components of components A and B by accurately screening functional additives such as radiation cooling fillers, multi-effect cosolvents, and superhydrophobic promoters, and at the same time optimizing the coating preparation process, ultimately significantly improving the radiation cooling performance, weather resistance, protective performance and environmental performance of the coating. Attached Figure Description

[0020] Figure 1 These are the test results of the internal air temperature of the coating water-based radiation cooling paint composition and the uncoated control group. Detailed Implementation

[0021] The present invention will now be described through specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Variations and advantages that can be conceived by those skilled in the art without departing from the spirit and scope of the inventive concept are included in the present invention, and the scope of protection of the present invention is defined by the appended claims and any equivalents thereof.

[0022] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Unless otherwise specified, the raw materials and equipment used in this invention are conventional in the art and can be obtained through conventional commercial means; unless otherwise specified, the methods used in this invention are conventional methods in the art.

[0023] In the following embodiments, the testing standard for near-infrared reflectance (NIR) of solar energy is GB / T 2680-2021 "Test Methods for Solar and Optical Performance of Building Glass"; the testing standard for solar reflectance (TSR) is JG / T 235-2014 "Reflective Thermal Insulation Coatings for Buildings"; the testing standard for water resistance (168h) is GB / T 1733-1993 "Determination of Water Resistance of Paint Films"; the testing standard for pencil hardness is GB / T 6739-2006 "Determination of Hardness of Paint Films by Pencil Method for Paints and Varnishes"; and the testing standard for cross-cut adhesion is GB / T 9286-1998 "Cross-cut Test of Paint Films for Paints and Varnishes".

[0024] Example 1: This invention provides an aqueous radiation-cooling coating composition comprising component A and component B. Component A comprises the following raw materials in parts by weight: 15 parts by weight of an aqueous base, 12 parts by weight of a multi-functional co-solvent, 60 parts by weight of a radiation-cooling functional filler, 12 parts by weight of an emulsion, 0.3 parts by weight of a hydrophobic additive, 0.3 parts by weight of a wetting agent, and 0.4 parts by weight of a thickener. Component B comprises the following raw materials in parts by weight: 60 parts by weight of a curing agent and 40 parts by weight of a second solvent.

[0025] In component A of this embodiment, the aqueous base is deionized water; the multi-effect cosolvent consists of 6 parts by weight of dispersant, 1 part by weight of defoamer, and 5 parts by weight of first solvent. The dispersant is an organically modified polyacrylate containing pigment affinity groups, the defoamer is a polyether siloxane copolymer emulsion, and the first solvent is ethylene glycol butyl ether; the radiative cooling functional filler consists of 20 parts by weight of boron nitride, 5 parts by weight of rare earth oxides, 10 parts by weight of ceramic powder, and 25 parts by weight of barium sulfate; the emulsion is a styrene-acrylic emulsion; the hydrophobic additive is a modified hydroxyl-functionalized polydimethylsiloxane solution; the wetting agent is an organosilicon twin structure surfactant; and the thickener is a nonionic polyurethane polymer.

[0026] In component B of this embodiment, the curing agent is isocyanate, and the second solvent is 1,2-propanediol diacetate (PGDA).

[0027] The preparation process of the above-mentioned water-based radiation cooling coating composition includes the following steps: Preparation of Component A: First, add deionized water to a container, turn on a high-speed disperser and stir. Add a multi-effect co-solvent at 300 rpm and stir for 5 minutes. Then add a radiative cooling filler and disperse at 2000 rpm for 30 minutes to obtain a slurry. Add an emulsion to a container, fix it on a disperser, turn on a high-speed disperser and stir. Add the dispersed slurry at 300 rpm, then adjust the speed to 500 rpm and disperse for 5 minutes. Add a hydrophobic additive and a wetting agent and mix. Then add a thickener to adjust the viscosity to between 80 and 90 KU. Then filter through a 100-mesh silk bag to remove impurities to obtain Component A. Preparation of component B: First, add the curing agent to the container, then add the second solvent and stir to disperse evenly until dissolved to obtain component B; When component A and component B are mixed at a ratio of 20:1, an aqueous radiation cooling coating composition is obtained.

[0028] The water-based radiative cooling coating composition was applied to a distribution box to form a coating. The near-infrared reflectance and solar reflectance of the coating were tested, and the results showed that the near-infrared reflectance and solar reflectance were 0.91 and 0.93, respectively. The physical and mechanical properties and environmental aging resistance of the coating were tested, and the results showed that the water resistance was normal after 168 hours, the pencil hardness was 2H, and the cross-cut adhesion was grade 1.

[0029] Example 2: This invention provides an aqueous radiation-cooling coating composition comprising component A and component B. Component A comprises the following raw materials in parts by weight: 15 parts by weight of an aqueous base, 9 parts by weight of a multi-functional co-solvent, 55 parts by weight of a radiation-cooling functional filler, 20 parts by weight of an emulsion, 0.3 parts by weight of a hydrophobic additive, 0.3 parts by weight of a wetting agent, and 0.4 parts by weight of a thickener. Component B comprises the following raw materials in parts by weight: 60 parts by weight of a curing agent and 40 parts by weight of a second solvent.

[0030] In component A of this embodiment, the aqueous base is deionized water; the multi-effect co-solvent consists of 4.5 parts by weight of dispersant, 0.9 parts by weight of defoamer, and 3.6 parts by weight of first solvent. The dispersant is a block copolymer containing pigment affinity groups, the defoamer is a polymer composite mineral oil, and the first solvent is dipropylene glycol butyl ether; the radiative cooling functional filler is a mixture of 15 parts by weight of boron nitride, 7 parts by weight of rare earth oxides, 20 parts by weight of barium sulfate, and 13 parts by weight of alumina; the emulsion is a polyurethane dispersion; the hydrophobic additive is a silicone-fluorine composite; the wetting agent is sodium dodecylbenzenesulfonate; and the thickener is a nonionic polyurethane polymer.

[0031] In component B of this embodiment, the curing agent is isocyanate, and the second solvent is 1,2-propanediol diacetate (PGDA).

[0032] The preparation process of the above-mentioned water-based radiation cooling coating composition includes the following steps: Preparation of Component A: First, add deionized water to a container, turn on a high-speed disperser and stir. Add a multi-effect co-solvent at 500 rpm and stir for 5 minutes. Then add a radiative cooling filler and disperse at 2000 rpm for 30 minutes to obtain a slurry. Add an emulsion to a container, fix it on a disperser, turn on a high-speed disperser and stir. Add the dispersed slurry at 300 rpm, then adjust the speed to 800 rpm and disperse for 3 minutes. Add a hydrophobic additive and a wetting agent and mix. Then add a thickener to adjust the viscosity to between 80 and 90 KU. Then filter through a 100-mesh silk bag to remove impurities to obtain Component A. Preparation of component B: First, add the curing agent to the container, then add the second solvent and stir to disperse evenly until dissolved to obtain component B; Component A and component B are mixed at a ratio of 15:1 to obtain an aqueous radiation cooling coating composition.

[0033] The water-based radiative cooling coating composition was applied to a distribution box to form a coating. The near-infrared reflectance and solar reflectance of the coating were tested, and the results showed that the near-infrared reflectance and solar reflectance were 0.93 and 0.94, respectively. The physical and mechanical properties and environmental aging resistance of the coating were tested, and the results showed that the water resistance was normal after 168 hours, the pencil hardness was 2H, and the cross-cut adhesion was grade 1.

[0034] Example 3: This invention provides an aqueous radiation-cooling coating composition comprising component A and component B. Component A comprises the following raw materials in parts by weight: 13 parts by weight of an aqueous base, 8 parts by weight of a multi-functional co-solvent, 65 parts by weight of a radiation-cooling functional filler, 13 parts by weight of an emulsion, 0.3 parts by weight of a hydrophobic additive, 0.3 parts by weight of a wetting agent, and 0.4 parts by weight of a thickener. Component B comprises the following raw materials in parts by weight: 70 parts by weight of a curing agent and 30 parts by weight of a second solvent.

[0035] In component A of this embodiment, the aqueous base is deionized water; the multi-effect co-solvent consists of 4 parts by weight of dispersant, 1 part by weight of defoamer, and 3 parts by weight of first solvent. The dispersant is an organically modified polyacrylate containing pigment affinity groups, the defoamer is an organosilicon compound, and the first solvent is diethylene glycol dimethyl ether; the radiative cooling functional filler is a mixture of 10 parts by weight of rare earth oxides, 20 parts by weight of barium sulfate, 33 parts by weight of alumina, and 2 parts by weight of nano-silica; the emulsion is a fluorocarbon emulsion; the hydrophobic additive is zinc oxide suspending agent; the wetting agent is fluoroalkyl polyoxyethylene ether; and the thickener is an alkali-swellable acrylic associative thickener.

[0036] In component B of this embodiment, the curing agent is isocyanate, and the second solvent is 1,2-propanediol diacetate (PGDA).

[0037] The preparation process of the above-mentioned water-based radiation cooling coating composition includes the following steps: Preparation of Component A: First, add deionized water to a container, turn on a high-speed disperser and stir. Add a multi-effect co-solvent at 700 rpm and stir for 3 minutes. Then add a radiative cooling filler and disperse at 2000 rpm for 30 minutes to obtain a slurry. Add an emulsion to a container, fix it on a disperser, turn on a high-speed disperser and stir. Add the dispersed slurry at 300 rpm, then adjust the speed to 600 rpm and disperse for 4 minutes. Add a hydrophobic additive and a wetting agent and mix. Then add a thickener to adjust the viscosity to between 80 and 90 KU. Then filter through a 100-mesh silk bag to remove impurities to obtain Component A. Preparation of component B: First, add the curing agent to the container, then add the second solvent and stir to disperse evenly until dissolved to obtain component B; When component A and component B are mixed at a ratio of 20:1, an aqueous radiation cooling coating composition is obtained.

[0038] The water-based radiative cooling coating composition was applied to a distribution box to form a coating. The near-infrared reflectance and solar reflectance of the coating were tested, and the results showed that the near-infrared reflectance and solar reflectance were 0.92 and 0.94, respectively. The physical and mechanical properties and environmental aging resistance of the coating were tested, and the results showed that the water resistance was normal after 168 hours, the pencil hardness was 2H, and the cross-cut adhesion was grade 1.

[0039] Comparative Example 1: This comparative example provides a coating composition comprising component A and component B, the preparation method of which includes the following steps: Preparation of Component A: First, add 13 parts by weight of deionized water to a container, turn on the high-speed disperser and stir. Add 6 parts by weight of multi-effect co-solvent at 300 rpm and stir for 5 minutes. Then add 30 parts by weight of titanium dioxide and 30 parts by weight of barium sulfate and disperse at 2000 rpm for 30 minutes to obtain a slurry. Add 20 parts by weight of emulsion to a container, fix it on the disperser, turn on the high-speed disperser and stir. Add the dispersed slurry at 300 rpm and then adjust the speed to 500 rpm. After dispersing for 5 minutes, add 0.3 parts by weight of hydrophobic additive and 0.3 parts by weight of wetting agent and mix. Then add 0.4 parts by weight of thickener to adjust the viscosity to between 80 and 90 KU. Then filter through a 100-mesh silk bag to remove impurities to obtain Component A. Preparation of component B: First, add 60 parts by weight of curing agent to a container, then add 40 parts by weight of second solvent and stir to disperse evenly until dissolved to obtain component B; Component A and component B are mixed at a ratio of 15:1 to obtain a coating composition.

[0040] In component A, the multi-functional co-solvent consists of 3.5 parts by weight of dispersant, 0.5 parts by weight of defoamer, and 2 parts by weight of first solvent. The dispersant is an organically modified polyacrylate containing pigment-affinity groups, the defoamer is a polyether siloxane copolymer emulsion, and the first solvent is ethylene glycol butyl ether. The emulsion is a styrene-acrylic emulsion. The hydrophobic additive is a modified hydroxyl-functionalized polydimethylsiloxane solution. The wetting agent is an organosilicon twin-structure surfactant. The thickener is a nonionic polyurethane polymer. In component B, the curing agent is isocyanate, and the second solvent is 1,2-propanediol diacetate (PGDA).

[0041] The coating composition was applied to the distribution box to form a coating. The near-infrared reflectance and solar reflectance of the coating were tested. The results showed that the near-infrared reflectance and solar reflectance were 0.83 and 0.85, respectively. The physical and mechanical properties and environmental aging resistance of the coating were tested. The results showed that the water resistance was normal after 168 hours, the pencil hardness was H, and the cross-cut adhesion was grade 1.

[0042] Comparing the test results of Examples 1-3 and Comparative Example 1, it can be seen that the coating prepared in Comparative Example 1 is inferior to that of Examples 1-3 in terms of near-infrared reflectance, solar reflectance, and pencil hardness. This proves that the composite radiation cooling functional filler selected in this invention and the multi-effect co-solvent with a specific amount added are the key to achieving efficient radiation cooling and improving protective performance. Conventional filler combinations cannot achieve the same optical performance.

[0043] The waterborne radiation-cooling coating prepared by this invention exhibits near-infrared reflectance (NIR) and total solar reflectance (TSR) exceeding 0.90, with a hemispherical emissivity of 0.89. Compared to polyurethane coatings, which have a NIR of 0.39, a TSR of 0.41, and a hemispherical emissivity (HE) of 0.83, this demonstrates a significant improvement in optical performance compared to solvent-based polyurethane coatings commonly used in power equipment. This improvement stems from the precise selection and formulation of radiation-cooling functional fillers, the optimization of filler dispersibility by multi-effect co-solvents, and the scattering enhancement design of the coating surface microstructure.

[0044] Secondly, the VOC emissions of the water-based radiation cooling coating and the solvent-based polyurethane coating prepared in Example 1 were tested. The test standard was GB / T 23986-2009 "Determination of Volatile Organic Compounds (VOC) Content in Paints and Varnishes - Difference Method". The results showed that the VOC emissions of the water-based radiation cooling coating were 92 g / L and the VOC emissions of the solvent-based polyurethane coating were 421 g / L, which proved that the present invention significantly reduced VOC emissions and improved its environmental performance.

[0045] To further verify the cooling effect of the water-based radiative cooling coating of this invention, two identical stainless steel distribution cabinets were used for testing. One cabinet was coated with the water-based radiative cooling coating prepared in Example 1, while the other remained uncoated. On a sunny day, high-precision thermometers were placed inside both distribution cabinets (to monitor the internal temperature), and another high-precision thermometer was placed near the cabinets (to record the ambient temperature). Figure 1 The results show the internal air temperature test results of two cabinets under sunlight. It can be seen that, compared to the distribution cabinet without the water-based radiative cooling coating, the internal temperature of the distribution cabinet coated with the water-based radiative cooling coating was consistently lower than that of the uncoated cabinet, by as much as 13.5℃ (air temperature 22-25℃). This indicates that the water-based radiative cooling coating is of great significance in improving the overheating of electrical equipment, ensuring reliable equipment operation, and enhancing energy-saving and environmental protection performance. Furthermore, it was found that the distribution cabinet coated with the water-based radiative cooling coating was about 4℃ lower than the ambient temperature at approximately 11:00 AM, indicating that the radiative cooling coating can effectively emit energy into outer space, significantly reducing the temperature of the distribution cabinet.

[0046] Unless otherwise specified, the raw materials and equipment used in this invention are all commonly used in the field; unless otherwise specified, the methods used in this invention are all conventional methods in the field.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A water-based radiative cooling coating composition, characterized in that, It includes component A and component B. Component A includes the following raw materials in parts by weight: 10-15 parts of aqueous base, 8-12 parts of multi-functional co-solvent, 55-65 parts of radiation cooling functional filler, 10-20 parts of emulsion, 0.1-0.8 parts of hydrophobic additive, 0.1-0.8 parts of wetting agent and 0.3-1 part of thickener, wherein the multi-functional co-solvent includes dispersant, defoamer and first solvent; Component B comprises the following raw materials in parts by weight: 60-70 parts of curing agent and 30-40 parts of second solvent.

2. The aqueous radiative cooling coating composition according to claim 1, characterized in that, In the multi-effect cosolvent, the active ingredient of the dispersant is selected from organic modified polyacrylate containing pigment affinity groups or block copolymer containing pigment affinity groups; the active ingredient of the defoamer is selected from one of polyether siloxane copolymer emulsion, acetylenol, polymer composite mineral oil, and organosilicon compound; the first solvent is selected from one or more of ethylene glycol butyl ether, dipropylene glycol butyl ether, and diethylene glycol dimethyl ether.

3. The aqueous radiative cooling coating composition according to claim 1, characterized in that, The radiative cooling filler is selected from one or more of barium sulfate, rare earth oxides, ceramic powder, alumina, boron nitride, and nano-silica.

4. The aqueous radiative cooling coating composition according to claim 1, characterized in that, The emulsion is selected from one or more of styrene-acrylic emulsions, polyurethane dispersions, and fluorocarbon emulsions.

5. The aqueous radiative cooling coating composition according to claim 1, characterized in that, The active ingredient of the hydrophobic additive is selected from one or more of the following: modified hydroxyl-functionalized polydimethylsiloxane solution, silicon-fluorine complex, and zinc oxide suspension.

6. The aqueous radiative cooling coating composition according to claim 1, characterized in that, The active ingredient of the wetting agent is selected from one or more of the following: organosilicon twin structure surfactant, sodium dodecylbenzenesulfonate, fluoroalkyl polyoxyethylene ether, and polyurethane modified polymer.

7. The aqueous radiative cooling coating composition according to claim 1, characterized in that, The active ingredient of the thickener is selected from one or more of nonionic polyurethane polymers and alkali-swellable acrylic associative thickeners.

8. The aqueous radiative cooling coating composition according to claim 1, characterized in that, The active ingredient of the curing agent is isocyanate, and the second solvent is 1,2-propanediol diacetate.

9. A preparation process for an aqueous radiation cooling coating composition, characterized in that, The aqueous radiation-cooling coating composition is obtained by mixing component A and component B. The preparation process of component A includes: mixing an aqueous substrate with a multi-functional co-solvent and a radiation-cooling functional filler to obtain a slurry; mixing the slurry with an emulsion, a hydrophobic additive and a wetting agent; and then adding a thickener to adjust the viscosity of the system to between 80 and 90 KU to obtain component A. The preparation process of component B includes: mixing and dissolving a curing agent with a second solvent to obtain component B.

10. The preparation process of the aqueous radiation cooling coating composition according to claim 9, characterized in that, The components A and B are mixed at a mass ratio of 15 to 20:1.

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