Radiation cooling fabric with long-time phase change heat storage and preparation method thereof

Abstract

The invention discloses a radiation cooling fabric with a long-time phase change heat storage function. The radiation cooling fabric comprises a porous flexible phase change film on the inner layer and a nanofiber film on the outer layer. The porous flexible phase change film comprises a phase change microcapsule, the thickness of the porous flexible phase change film is 1000-1500 [mu] m, and the particle size of the phase change microcapsule is 1-10 [mu] m; the nanofiber membrane comprises nanofibers, the length of the nanofibers is larger than 1000 microns, and the diameter of the nanofibers is 10-1000 nm. And the thickness of the nanofiber membrane is 150 to 500 [mu] m. The prepared flexible film fabric has excellent air permeability, moisture penetrability, cycling stability, thermal stability and washability, and the thermal comfort of a human body in a high-temperature environment is enhanced through the combination of radiation cooling and latent heat storage technologies.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite membrane fabrics, and in particular relates to a flexible membrane fabric having both radiation cooling and long-term phase change heat storage functions and a preparation method thereof. Background Art

[0002] In recent years, with global climate change, extreme weather has become more and more frequent. In particular, hot weather can cause heat stress and even life safety issues for people who work outdoors for a long time. When the ambient temperature is higher than the human body temperature, traditional fabrics cannot meet the human body's thermal comfort needs. It is urgent to develop energy-free temperature-control fabrics to effectively regulate personal thermal management.

[0003] Radiative cooling technology is widely used in the textile field due to its excellent cooling performance. However, the inherent maximum cooling power of radiative cooling fabrics limits their performance when encountering thermal shock. At present, although there are some dual-function fabrics that have both radiative cooling and latent heat storage to achieve cooling and thermal shock resistance. However, the phase change fabrics are usually prepared by blending, cross-linking deposition, and composite spinning, which are not only technically complex but also have the disadvantages of low phase change enthalpy, easy leakage, and poor compatibility. Therefore, due to the limited duration of latent heat of phase change, it is still a great challenge for dual-function fabrics to maintain human thermal comfort for a long time. Here, a large number of stable phase change microcapsules are filled in porous fabrics through a simple phase transformation technology, which not only solves the above problems, but also improves the phase change heat storage capacity, and is combined with radiative cooling fiber materials to achieve efficient cooling and thermal shock resistance. This strategy provides a powerful way to protect the human body from heat accumulation and high temperature damage, and expands the application of radiative cooling and latent heat storage technology. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a flexible membrane fabric having both radiative cooling and long-term phase change heat storage functions and a preparation method thereof. The specific scheme is as follows:

[0005] In one aspect, the present invention provides a radiative cooling fabric with long-term phase change heat storage, comprising an inner porous flexible phase change membrane and an outer nanofiber membrane;

[0006] The porous flexible phase change membrane includes phase change microcapsules, the thickness of the porous flexible phase change membrane is 1000-1500 μm, and the particle size of the phase change microcapsules is 1-10 μm;

[0007] The nanofiber membrane comprises nanofibers, the length of the nanofibers is greater than 1000 μm, and the diameter is 10-1000 nm; the thickness of the nanofiber membrane is 150-500 μm.

[0008] In another aspect, the present invention provides a method for preparing a radiative cooling fabric, comprising the following steps:

[0009] S1. According to the solid-liquid ratio of phase change microcapsules, film-forming agent and film-forming solvent of 1:10:200~20:2:3g / g / mL, the phase change microcapsules and film-forming agent are dissolved in the film-forming solvent, respectively, and then mixed, and a porous flexible phase change film is obtained by precision coating and phase inversion method, and dried naturally at room temperature;

[0010] S2. According to the solid-liquid ratio of the organic polymer with radiation cooling performance to the organic polymer solvent of 1:20 to 1:3 g / mL, the organic polymer is completely dissolved in the organic polymer solvent and injected into a 5 to 20 mL syringe. The syringe is equipped with an 18 to 23 gauge needle. The solution is spun using electrospinning technology to form a nanofiber membrane on the surface of the porous flexible phase change membrane, and then dried under vacuum conditions at 35 to 70°C for 4 to 28 hours.

[0011] Preferably, the phase change microcapsule is composed of a phase change material and a shell material, the mass percentage of the phase change material is 35-90%, and the phase change material includes one or more of aliphatic hydrocarbons, fatty alcohols and fatty acids; the shell material includes polymethyl methacrylate, polyurethane, silicon dioxide and ferrosoferric oxide.

[0012] Preferably, the film-forming agent includes one or more of polyvinyl alcohol, polyvinyl butyral resin, carboxymethyl cellulose, and polyvinyl pyrrolidone.

[0013] Preferably, the membrane-forming solvent comprises one or more combinations of methanol, ethanol and acetone.

[0014] Preferably, the mass ratio of the phase change microcapsules to the film-forming agent is 10:1.

[0015] Preferably, the organic polymer having radiation cooling performance includes one or more of polyvinyl butyral resin, polyvinyl alcohol, polyvinyl chloride, polyvinylidene fluoride, polyvinylidene fluoride hexafluoropropylene, polymethyl methacrylate and polyethylene terephthalate.

[0016] Preferably, the organic polymer solvent includes one or more of ethanol, acetone, N,N-dimethylformamide and tetrahydrofuran.

[0017] Preferably, in step S1, the coating speed of the precision coating is 10 to 200 mm / s, and the scraper height ranges from 0.1 to 2 mm.

[0018] Preferably, in the step S2, the electrospinning voltage of the electrospinning technology is 10-25 kV, the propulsion speed is 0.0001-0.1 mm / s, and the distance is 8-16 cm.

[0019] Beneficial effects:

[0020] 1. The method for preparing the flexible membrane fabric of the present invention is simple and environmentally friendly;

[0021] 2. The inner layer of the flexible membrane fabric prepared by the present invention contains hydrophobic phase change microcapsules, which will not absorb sweat when close to human skin, and thus will not affect the phase change performance; the porous phase change layer has weak hydrophilicity, which can prevent the adhesion between the fabric and the skin; the outer nanofiber membrane has high visible light reflectivity and high infrared emissivity, showing a good radiation cooling effect; filling a large number of stable phase change microcapsules gives the porous flexible phase change membrane an efficient heat storage capacity, and combined with the radiation cooling fiber material, it realizes long-term cooling and thermal shock resistance;

[0022] 3. The flexible membrane fabric prepared by the present invention has excellent air permeability, moisture permeability, cycle stability, thermal stability and washability. The combination of radiant cooling and latent heat storage technology enhances the thermal comfort of the human body in a high temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a scanning electron microscope image of the surface of the flexible membrane fabric prepared in Example 1 of the present invention; wherein a is a SEM image of the surface of the porous phase change membrane layer; and b is a SEM image of the surface of the nanofiber membrane layer. DETAILED DESCRIPTION

[0024] The present invention will be further explained below in conjunction with the accompanying drawings and embodiments.

[0025] The present invention can be better understood according to the following examples. However, it is easy for those skilled in the art to understand that the specific material ratios, process conditions and results described in the examples are only used to illustrate the present invention.

[0026] Figure 1 The SEM images of the two surfaces of the flexible membrane fabric are shown. Figure 1 a is a porous flexible phase change membrane layer. Due to the porous structure formed during the phase transformation process, a large number of phase change microcapsules are evenly distributed on the membrane surface, and the particle size of the microspheres is about 3μm. In addition, a large number of phase change microcapsules are also gathered inside the gaps, which is beneficial to enhance the phase change heat storage capacity of the fabric. Figure 1 b is the nanofiber membrane layer. The ultra-long nano-scale fibers are randomly distributed and staggered to form a porous network structure, showing strong physical entanglement, which is conducive to improving the flexibility and mechanical properties of wearable flexible membrane fabrics. The results show that a flexible membrane fabric with both radiative cooling and long-term phase change heat storage functions has been successfully prepared.

[0027] Embodiment 1:

[0028] A method for preparing a radiative cooling fabric with long-term phase change heat storage comprises the following steps:

[0029] a), weigh 2.73g of polyvinyl butyral resin and dissolve it in 20mL of anhydrous ethanol, and stir it at 40°C for 2h to obtain a film-forming solution; weigh 6.37g of phase change microcapsules (core: eicosanoid paraffin, shell: polymethyl methacrylate) in 20mL of anhydrous ethanol, stir it at room temperature for 0.5h to obtain a uniform dispersion; then, slowly drop the dispersion into the film-forming solution, and stir it at room temperature for 10min to obtain a uniformly dispersed phase-to-film solution; finally, form a liquid film by coating the phase-to-film solution on the surface of a glass sheet (the distance between the scraper and the glass sheet is 1mm), transfer it to distilled water and immerse it for 10h, and dry it naturally at room temperature to obtain a porous flexible phase change film;

[0030] b) Weigh 1.12 g of polyvinyl butyral resin and dissolve it in 10 mL of anhydrous ethanol. Stir it magnetically at 40 ° C for 2 hours to form a transparent spinning solution. Use a syringe equipped with a 20-gauge needle to draw 10 mL of the spinning solution and spin it at a voltage of 18 kV to form a nanofiber membrane on the surface of the porous flexible phase change membrane (wherein the propulsion speed is 0.001 mm / s and the distance is 10 cm). Vacuum dry it at 60 ° C for 10 hours to obtain a flexible membrane fabric with both radiative cooling and long-term phase change heat storage functions.

[0031] The combination of long-term phase change heat storage and radiative cooling performance can not only resist thermal shock, but also achieve a better cooling effect. The optical properties of the material's solar reflectivity and infrared emissivity are one of the objective criteria for evaluating radiative cooling performance.

[0032] The optical properties of the outer layer of the fabric are tested by UV-Vis-NIR spectrophotometer and IR spectrophotometer respectively. The results show that the average reflectivity of the outer nanocellulose film in the sunlight band is 90.1%, and the average emissivity in the infrared band is 95.7%. The DSC test shows that the heat storage phase change enthalpy of the inner porous flexible phase change membrane is 124.3 J / g; the heat storage time is 2.7 h. The combination of radiation cooling and long-term phase change heat storage function achieves a good cooling effect (8.5°C lower than the ambient temperature).

[0033] Example 2

[0034] A method for preparing a flexible membrane fabric having both radiation cooling and long-term phase change heat storage functions comprises the following steps:

[0035] a), weigh 3.53g of polyvinyl alcohol and dissolve it in 20mL of anhydrous ethanol, and stir it at 40°C for 1.5h to obtain a film-forming solution; weigh 5.30g of phase change microcapsules (core: octadecane paraffin, shell: polymethyl methacrylate) in 20mL of anhydrous ethanol, stir it at room temperature for 0.5h to obtain a uniform dispersion; then, slowly drop the dispersion into the film-forming solution, and stir it at room temperature for 10min to obtain a uniformly dispersed phase-to-film solution; finally, form a liquid film by coating the phase-to-film solution on the surface of a glass sheet (the distance between the scraper and the glass sheet is 1.2mm), transfer it to distilled water and immerse it for 10h, and dry it naturally at room temperature to obtain a porous flexible phase change film;

[0036] b) Weigh 1.76 g of polyvinylidene fluoride hexafluoropropylene and dissolve it in 10 mL of a mixture of acetone and N,N-dimethylformamide (volume ratio 3:7), and magnetically stir it at 40°C for 5 hours to form a transparent spinning solution. Use a syringe equipped with a 19-gauge needle to draw 10 mL of the spinning solution, and spin it at a voltage of 16 kV on the surface of the porous flexible phase change membrane to form a nanofiber membrane (where the propulsion speed is 0.008 mm / s and the distance is 15 cm). Vacuum dry it at 60°C for 10 hours to obtain a flexible membrane fabric with both radiative cooling and long-term phase change heat storage functions.

[0037] The combination of long-term phase change heat storage and radiative cooling performance can not only resist thermal shock, but also achieve a better cooling effect. The optical properties of the material's solar reflectivity and infrared emissivity are one of the objective criteria for evaluating radiative cooling performance.

[0038] The optical properties of the outer layer of the fabric are tested by UV-Vis-NIR spectrophotometer and IR spectrophotometer respectively. The results show that the average reflectivity of the outer nanocellulose film in the sunlight band is 91%, and the average emissivity in the infrared band is 96%. The DSC test shows that the heat storage phase change enthalpy of the inner porous flexible phase change film is 94.6 J / g; the heat storage time is 1.1 h. The combination of radiation cooling and long-term phase change heat storage function achieves a good cooling effect (8.7°C lower than the ambient temperature).

[0039] Example 3

[0040] A method for preparing a flexible membrane fabric having both radiation cooling and long-term phase change heat storage functions comprises the following steps:

[0041] a), weigh 3.26g of carboxymethyl cellulose and dissolve it in 20mL of methanol, and stir it at 40℃ for 2h to obtain a film-forming solution; weigh 6.05g of phase change microcapsules (core: decanoic acid, shell: polyurethane) in 20mL of methanol, stir it at room temperature for 20min to obtain a uniform dispersion; then, slowly add the dispersion to the film-forming solution, and stir it at room temperature for 10min to obtain a uniformly dispersed phase-to-film solution; finally, form a liquid film by coating the phase-to-film solution on the surface of a glass sheet (the distance between the scraper and the glass sheet is 0.8mm), transfer it to distilled water and immerse it for 8h, and dry it naturally at room temperature to obtain a porous flexible phase change membrane;

[0042] b) Weigh 0.87 g of polyvinylidene fluoride and dissolve it in 10 mL of N,N-dimethylformamide, and magnetically stir it at 38°C for 4 hours to form a transparent spinning solution. Use a syringe equipped with a 21-gauge needle to draw 10 mL of the spinning solution, and spin it at a voltage of 17 kV to form a nanofiber membrane on the surface of the porous flexible phase change membrane (wherein the propulsion speed is 0.005 mm / s and the distance is 12 cm). Vacuum dry it at 60°C for 10 hours to obtain a flexible membrane fabric with both radiative cooling and long-term phase change heat storage functions.

[0043] The combination of long-term phase change heat storage and radiative cooling performance can not only resist thermal shock, but also achieve a better cooling effect. The optical properties of the material's solar reflectivity and infrared emissivity are one of the objective criteria for evaluating radiative cooling performance.

[0044] The optical properties of the outer layer of the fabric are tested by UV-Vis-NIR spectrophotometer and IR spectrophotometer respectively. The results show that the average reflectivity of the outer nanocellulose film in the sunlight band is 92.5%, and the average emissivity in the infrared band is 94.6%. The DSC test shows that the heat storage phase change enthalpy of the inner porous flexible phase change membrane is 132.8 J / g; the heat storage time is 3.2 h. The combination of radiation cooling and long-term phase change heat storage function achieves a good cooling effect (9.3°C lower than the ambient temperature).

[0045] Example 4

[0046] A method for preparing a flexible membrane fabric having both radiation cooling and long-term phase change heat storage functions comprises the following steps:

[0047] a), weigh 2.73g of polyvinyl pyrrolidone and dissolve it in 20mL of anhydrous ethanol, and stir it at 30°C for 2.5h to obtain a film-forming solution; weigh 5.80g of phase change microcapsules (core: polyethylene glycol, shell: silica) in 20mL of anhydrous ethanol, stir it at room temperature for 40min to obtain a uniform dispersion; then, slowly drop the dispersion into the film-forming solution, and stir it at room temperature for 20min to obtain a uniformly dispersed phase-to-film solution; finally, form a liquid film by coating the phase-to-film solution on the surface of a glass sheet (the distance between the scraper and the glass sheet is 1.2mm), transfer it to distilled water and immerse it for 12h, and dry it naturally at room temperature to obtain a porous flexible phase change membrane;

[0048] b) Weigh 1.63 g of polyvinyl chloride and dissolve it in 10 mL of tetrahydrofuran, and magnetically stir it at 40°C for 3 hours to form a transparent spinning solution. Use a syringe equipped with a 19-gauge needle to draw 10 mL of the spinning solution, and spin it at a voltage of 18 kV to form a nanofiber membrane on the surface of the porous flexible phase change membrane (wherein the propulsion speed is 0.0008 mm / s and the distance is 12 cm). Vacuum dry it at 60°C for 10 hours to obtain a flexible membrane fabric with both radiative cooling and long-term phase change heat storage functions.

[0049] The combination of long-term phase change heat storage and radiative cooling performance can not only resist thermal shock, but also achieve a better cooling effect. The optical properties of the material's solar reflectivity and infrared emissivity are one of the objective criteria for evaluating radiative cooling performance.

[0050] The optical properties of the outer layer of the fabric are tested by UV-Vis-NIR spectrophotometer and IR spectrophotometer respectively. The results show that the average reflectivity of the outer nanocellulose film in the sunlight band is 91.6%, and the average emissivity in the infrared band is 96.4%. The DSC test shows that the heat storage phase change enthalpy of the inner porous flexible phase change film is 102.6 J / g; the heat storage time is 1.5 h. The combination of radiation cooling and long-term phase change heat storage function achieves a good cooling effect (8.8°C lower than the ambient temperature).

[0051] Example 5

[0052] A method for preparing a flexible membrane fabric having both radiation cooling and long-term phase change heat storage functions comprises the following steps:

[0053] a), weigh 2.73g of polyvinyl butyral resin and dissolve it in 20mL of anhydrous ethanol, and stir it at 40°C for 2h to obtain a film-forming solution; weigh 6.37g of phase change microcapsules (core: polyethylene glycol, shell: ferroferric oxide) in 20mL of anhydrous ethanol, stir it at room temperature for 20min to obtain a uniform dispersion; then, slowly drop the dispersion into the film-forming solution, and stir it at room temperature for 15min to obtain a uniformly dispersed phase-to-film solution; finally, form a liquid film by coating the phase-to-film solution on the surface of a glass sheet (the distance between the scraper and the glass sheet is 1mm), transfer it to distilled water and immerse it for 10h, and dry it naturally at room temperature to obtain a porous flexible phase change membrane;

[0054] b) Weigh 1.12 g of polyvinyl alcohol and dissolve it in 10 mL of acetone. Stir it magnetically at 35°C for 4 hours to form a transparent spinning solution. Use a syringe equipped with a 20-gauge needle to draw 10 mL of the spinning solution and spin it at a voltage of 19 kV to form a nanofiber membrane on the surface of the porous flexible phase change membrane (wherein the propulsion speed is 0.002 mm / s and the distance is 15 cm). Vacuum dry it at 60°C for 10 hours to obtain a flexible membrane fabric with both radiative cooling and long-term phase change heat storage functions.

[0055] The combination of long-term phase change heat storage and radiative cooling performance can not only resist thermal shock, but also achieve a better cooling effect. The optical properties of the material's solar reflectivity and infrared emissivity are one of the objective criteria for evaluating radiative cooling performance.

[0056] The optical properties of the outer layer of the fabric are tested by UV-Vis-NIR spectrophotometer and IR spectrophotometer respectively. The results show that the average reflectivity of the outer nanocellulose film in the sunlight band is 92.1%, and the average emissivity in the infrared band is 93.8%. The DSC test shows that the heat storage phase change enthalpy of the inner porous flexible phase change film is 106.4 J / g; the heat storage time is 1.8 h. The combination of radiation cooling and long-term phase change heat storage function achieves a good cooling effect (9.1°C lower than the ambient temperature).

[0057] Example 6

[0058] A method for preparing a flexible membrane fabric having both radiation cooling and long-term phase change heat storage functions comprises the following steps:

[0059] a), weigh 2.73g of carboxymethyl cellulose and dissolve it in 20mL of methanol, and stir it at 40℃ for 2h to obtain a film-forming solution; weigh 6.37g of phase change microcapsules (core: decanoic acid, shell: silica) in 20mL of methanol, stir it at room temperature for 20min to obtain a uniform dispersion; then, slowly drop the dispersion into the film-forming solution, and stir it at room temperature for 10min to obtain a uniformly dispersed phase-to-film solution; finally, form a liquid film by coating the phase-to-film solution on the surface of a glass sheet (the distance between the scraper and the glass sheet is 0.7mm), transfer it to distilled water and immerse it for 8h, and dry it naturally at room temperature to obtain a porous flexible phase change membrane;

[0060] b) Weigh 0.87 g of polymethyl methacrylate and dissolve it in 10 mL of a mixture of acetone and N,N-dimethylformamide (volume ratio of 3:7), and magnetically stir it at 40°C for 3 hours to form a transparent spinning solution. Use a syringe equipped with an 18-gauge needle to draw 10 mL of the spinning solution, and spin it at a voltage of 18 kV to form a nanofiber membrane on the surface of the porous flexible phase change membrane (wherein the propulsion speed is 0.006 mm / s and the distance is 15 cm). Vacuum dry it at 60°C for 10 hours to obtain a flexible membrane fabric with both radiative cooling and long-term phase change heat storage functions.

[0061] The combination of long-term phase change heat storage and radiative cooling performance can not only resist thermal shock, but also achieve a better cooling effect. The optical properties of the material's solar reflectivity and infrared emissivity are one of the objective criteria for evaluating radiative cooling performance.

[0062] The optical properties of the outer layer of the fabric are tested by UV-Vis-NIR spectrophotometer and IR spectrophotometer respectively. The results show that the average reflectivity of the outer nanocellulose film in the sunlight band is 94.3%, and the average emissivity in the infrared band is 93.6%. The DSC test shows that the heat storage phase change enthalpy of the inner porous flexible phase change membrane is 127.6 J / g; the heat storage time is 3.0 h. The combination of radiation cooling and long-term phase change heat storage function achieves a good cooling effect (9.6°C lower than the ambient temperature).

[0063] Table 1 Relevant performance test of flexible membrane fabric

[0064]

[0065] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A radiative cooling fabric with long-term phase change heat storage, characterized in that: It includes an inner porous flexible phase change membrane and an outer nanofiber membrane; The porous flexible phase change membrane includes phase change microcapsules, the thickness of the porous flexible phase change membrane is 1000-1500 μm, and the particle size of the phase change microcapsules is 1-10 μm; The nanofiber membrane comprises nanofibers, the length of the nanofibers is greater than 1000 μm, and the diameter is 10-1000 nm; the thickness of the nanofiber membrane is 150-500 μm.

2. The method for preparing the radiant cooling fabric according to claim 1, characterized in that: The steps include: S1. According to the solid-liquid ratio of phase change microcapsules, film-forming agent and film-forming solvent of 1:10:200~20:2:3g / g / mL, the phase change microcapsules and film-forming agent are dissolved in the film-forming solvent, respectively, and then mixed, and a porous flexible phase change film is obtained by precision coating and phase inversion method, and dried naturally at room temperature; S2. According to the solid-liquid ratio of the organic polymer with radiation cooling performance to the organic polymer solvent of 1:20 to 1:3 g / mL, the organic polymer is completely dissolved in the organic polymer solvent and injected into a 5 to 20 mL syringe. The syringe is equipped with an 18 to 23 gauge needle. The solution is spun using electrospinning technology to form a nanofiber membrane on the surface of the porous flexible phase change membrane, and then dried under vacuum conditions at 35 to 70°C for 4 to 28 hours.

3. The method for preparing the radiant cooling fabric according to claim 2, characterized in that: The phase change microcapsule is composed of a phase change material and a shell material. The mass percentage of the phase change material is 35-90%. The phase change material includes one or more of aliphatic hydrocarbons, aliphatic alcohols and fatty acids. The shell material includes polymethyl methacrylate, polyurethane, silicon dioxide and ferrosoferric oxide.

4. The method for preparing the radiant cooling fabric according to claim 2, characterized in that: The film-forming agent includes one or more of polyvinyl alcohol, polyvinyl butyral resin, carboxymethyl cellulose and polyvinyl pyrrolidone.

5. The method for preparing the radiant cooling fabric according to claim 2, characterized in that: The membrane-forming solvent includes one or more combinations of methanol, ethanol and acetone.

6. The method for preparing the radiant cooling fabric according to claim 2, characterized in that: The mass ratio of the phase change microcapsules to the film-forming agent is 10:

1.

7. The method for preparing the radiant cooling fabric according to claim 2, characterized in that: The organic polymer having the radiation cooling property includes one or more of polyvinyl butyral resin, polyvinyl alcohol, polyvinyl chloride, polyvinylidene fluoride, polyvinylidene fluoride hexafluoropropylene, polymethyl methacrylate and polyethylene terephthalate.

8. The method for preparing the radiant cooling fabric according to claim 2, characterized in that: The organic polymer solvent includes one or more of ethanol, acetone, N,N-dimethylformamide and tetrahydrofuran.

9. The method for preparing the radiant cooling fabric according to claim 2, characterized in that: In the step S1, the coating speed of the precision coating is 10 to 200 mm / s, and the scraper height ranges from 0.1 to 2 mm.

10. The method for preparing the radiant cooling fabric according to claim 2, characterized in that: In the step S2, the electrospinning voltage of the electrospinning technology is 10-25 kV, the propulsion speed is 0.0001-0.1 mm / s, and the distance is 8-16 cm.

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