A thermally adaptive radiation cooling material with phase change function and preparation method thereof

Abstract

The present invention relates to a thermally adaptive radiation cooling material with phase change function and a preparation method thereof, which is composed of an organic network framework and an inorganic nano self-assembled cavity distributed inside. The preparation process includes: mixing an oil-soluble monomer, a crosslinking agent, a photoinitiator and a surfactant to prepare an organic prepolymer liquid A; mixing an inorganic nano-element, a water-soluble monomer and a photoinitiator to prepare an inorganic nano-dispersion liquid B; mixing A and B in a volume ratio of 2:1-6 to form a precursor emulsion system C, and obtaining a two-phase heterogeneous gel D by ultraviolet light in-situ polymerization. After drying, a thermally adaptive radiation cooling material with a heterogeneous pore structure is formed, which realizes a high infrared emissivity through the strong infrared vibration of the surface molecular groups; the high refractive index difference of the internal heterogeneous pore structure effectively scatters the sunlight; and the phase change polymer network it possesses can absorb heat and alleviate high-temperature heat accumulation. At the same time, the self-repairing, self-cleaning and tolerance of this material improve the environmental adaptability and expand the scope of application.

Description

Technical Field

[0001] The invention belongs to the technical field of phase change and radiation refrigeration, and in particular relates to a method for preparing a phase change functional thermally adaptive radiation cooling material with a heterogeneous pore structure. Background Art

[0002] The current global warming has increased the demand for space cooling. However, traditional cooling methods, such as air conditioning and cold storage, usually consume a lot of energy and emit a lot of greenhouse gases. Radiative cooling, as a passive cooling technology without energy consumption, has received widespread attention. It achieves cooling effect by reflecting the solar band (0.3-2.5 μm) and radiating heat to outer space in the atmospheric window band (8-13 μm).

[0003] In order to achieve strong reflection of the solar band, the current radiation cooling materials have designed multilayer materials, nanocomposites, nanofibers and porous structure materials. These materials have low reflection efficiency for the solar spectrum due to insufficient internal scattering interfaces, and lack effective molecular groups to achieve regulation of the infrared band. At the same time, for the heating devices in the equipment, the low thermal resistance of most radiation cooling materials makes it difficult to handle the heat accumulation caused by the thermal pulses of the devices in the working state. Some radiation cooling materials designed with phase change microcapsules as phase change materials have the function of high-temperature phase change, but have the disadvantage of phase change material leakage. In addition, traditional radiation cooling materials do not have environmental tolerance such as hydrophobicity and anti-fouling. Dust and water accumulated on the surface of the material in the external environment will seriously affect the effect of radiation cooling. Therefore, it is necessary to design a thermally adaptable radiation cooling material with more efficient radiation cooling capacity, thermal buffering capacity and environmental adaptability. Summary of the invention

[0004] The present invention aims to further improve the solar reflection efficiency and infrared emission efficiency of the radiation cooling material through the multi-level scattering effect of the heterogeneous pore structure and the effective infrared groups, thereby improving the cooling power of the radiation cooling material. At the same time, the phase change polymer network inside the thermally adaptable radiation cooling material can effectively alleviate the heat accumulation generated by the thermal pulse of the covered working device, and expand the application of the radiation cooling material. At the same time, its self-repairing, self-cleaning and anti-pollution properties of pollutants can effectively improve environmental adaptability.

[0005] The present invention provides a method for preparing a thermally adaptive radiation cooling material with phase change function, which is composed of an organic gel network framework and a plurality of inorganic nano self-assembled cavities distributed inside the organic gel network framework;

[0006] The thermally adaptive radiation cooling material with phase change thermal buffering function is prepared by the following method:

[0007] S1. Fully stir and mix the oil-soluble monomer, oil-soluble crosslinking agent, photoinitiator and surfactant in a volume ratio of 1:0.01-0.05:0.01-0.05:0.01-0.1 to prepare an organic network prepolymer solution A;

[0008] S2, inorganic nano-element, water-soluble monomer and photoinitiator are fully stirred and mixed in a volume ratio of 1:0.5:0.005-0.02 to prepare inorganic nano-dispersion liquid B;

[0009] S3, mixing the organic network prepolymer liquid A and the inorganic nano-dispersion liquid B in a volume ratio of 1:1-5, and fully emulsifying to obtain a precursor emulsion system C with an aqueous phase as a dispersed phase and an organic phase as a continuous phase;

[0010] S4, subjecting the precursor emulsion system C to in-situ polymerization under ultraviolet light to obtain a two-phase heterogeneous gel D.

[0011] S5. After the internal hydrogel of the two-phase heterogeneous gel D is dried at room temperature for 12 hours, the thermally adaptive radiation cooling material with phase change function is finally obtained.

[0012] The heterogeneous pore structure passive radiation cooling material of the present invention can be used in a variety of different fields. It is suitable for application on the surface of the exterior wall of a building. By covering the building surface with the material, the function of cooling at night and during the day can be achieved. It is also suitable for application on outdoor electronic equipment. By covering the equipment with the material, the function of heat dissipation and elimination of thermal pulses can be achieved. It can also be used on space shuttles and satellite equipment to achieve thermally adaptive radiation cooling in outer space. The reflectivity of the above-mentioned example of the heterogeneous pore structure passive radiation cooling material of the present invention to the solar band of 0.3 to 2.5 μm is greater than or equal to 97.3%, and the emissivity to the atmospheric window (8 to 13 μm) in the mid-infrared region is greater than or equal to 96.5%. This material has a good solar radiation blocking effect and can cover the main infrared emission wavelength range. At the same time, its self-repairing performance for cracks, self-cleaning and anti-pollution performance for pollutants can effectively increase the service life of the passive radiation cooling material. The preparation method of the thermally adaptive radiation cooling material with phase change function of the present invention is simple, low-cost, easy to implement, and worthy of wide application.

[0013] In the thermally adaptive radiation cooling material with phase change function described in the present invention, as a preferred embodiment, the oil-soluble monomer comprises one or more of the following:

[0014] Methyl methacrylate, ethyl methacrylate, butyl methacrylate, isobutyl methacrylate, hexyl methacrylate, octyl methacrylate, lauryl methacrylate, octadecyl methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate, isobutyl acrylate, hexyl acrylate, octyl acrylate, lauryl acrylate, octadecyl acrylate, behenyl acrylate.

[0015] In the phase-change function thermally adaptive radiation cooling material of the present invention, as a preferred embodiment, the oil-soluble cross-linking agent comprises one or more of the following:

[0016] Triethylene glycol dimethacrylate, diethylene glycol dimethacrylate, ethylene glycol dimethacrylate.

[0017] In the thermally adaptive radiation cooling material with phase change function described in the present invention, as a preferred embodiment, the surfactant comprises one or more of the following:

[0018] Polyglycerol fatty acid esters, diglycerol monolaurate, octadecyl phosphate, fatty alcohol polyoxyethylene ether phosphate, dihydroxystearate, laurate.

[0019] The thermally adaptive radiation cooling material with phase change function described in the present invention, as a preferred embodiment, the inorganic nano-element comprises one or more of the following:

[0020] Boron nitride nanosheets, aluminum oxide particles, zinc oxide particles, titanium dioxide particles, silicon dioxide particles, calcium carbonate particles, magnesium oxide particles, aluminum silicate particles.

[0021] In the phase-change thermally adaptive radiation cooling material of the present invention, as a preferred embodiment, the water-soluble monomer comprises one or more of the following:

[0022] Acrylamide, acrylic acid, N-hydroxymethyl acrylamide, polyethylene glycol, hydroxyethyl acrylamide, polyvinyl alcohol, 2-acrylamido-2-methylpropane sulfonic acid, vinyl pyrrolidone.

[0023] In the phase-change function thermally adaptive radiation cooling material of the present invention, as a preferred embodiment, the photoinitiator comprises one or more of the following:

[0024] 2,2-diethoxyacetophenone, 1-hydroxycyclohexylacetophenone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 1-hydroxycyclohexylphenyl ketone, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

[0025] The present invention has the following advantages:

[0026] Thermally adaptive radiation cooling materials based on phase change function can improve the solar reflectivity and infrared emissivity of radiation cooling materials, thereby improving the cooling power of the materials. The phase change polymer network inside the thermally adaptive radiation cooling materials can eliminate the heat accumulation generated by the thermal pulse of the working device and expand the application of radiation cooling materials. The self-healing properties of thermally adaptive radiation cooling materials can effectively repair the wounds caused by environmental ruptures. At the same time, their self-cleaning and anti-pollution properties against pollutants can effectively increase the service life of passive radiation cooling materials and improve their tolerance to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The preparation process and structural diagram of a thermally adaptive radiation cooling material with phase change function;

[0028] Figure 2 A flow chart of a method for preparing a thermally adaptive radiation cooling material with phase change function;

[0029] Figure 3 A data graph of reflectivity and emissivity of a phase-changing thermally adaptive radiative cooling material;

[0030] Figure 4 It is a graph of actual cooling data of a phase-change-functional thermally adaptive radiation cooling material in an outdoor environment;

[0031] Figure 5 This is a comparison chart of the surface temperature of a heating device wrapped with a thermally adaptive radiation cooling material with phase change function and a bare heating device. DETAILED DESCRIPTION Example 1

[0032] like Figure 1~2 As shown, the thermally adaptive radiation cooling material with phase change function is prepared by the following method:

[0033] S1. Fully stir and mix the oil-soluble monomer, oil-soluble crosslinking agent, photoinitiator and surfactant in a volume ratio of 1:0.01-0.05:0.01-0.05:0.01-0.1 to prepare an organic network prepolymer solution A;

[0034] S2, inorganic nano-element, water-soluble monomer and photoinitiator are fully stirred and mixed in a volume ratio of 1:0.5:0.005-0.02 to prepare inorganic nano-dispersion liquid B;

[0035] S3, mixing the organic network prepolymer liquid A and the inorganic nano-dispersion liquid B in a volume ratio of 1:1-5 to obtain a precursor emulsion system C with an aqueous phase as a dispersed phase and an organic phase as a continuous phase;

[0036] S4, subjecting the precursor emulsion system C to in-situ polymerization under ultraviolet light to obtain a two-phase heterogeneous gel D.

[0037] S5. After the internal hydrogel of the two-phase heterogeneous gel D is dried at room temperature, the thermally adaptive radiation cooling material with phase change function is finally obtained.

[0038] like Figure 3As shown, a phase-change function thermally adaptive radiation cooling material of the present invention can be used to reflect visible light, near-infrared light and ultraviolet light in sunlight, and emit mid-infrared light, and dissipate heat through the atmospheric window in the form of infrared radiation. The highest reflectivity of visible light in the 0.38-0.78μm band is about 99%, the highest reflectivity in the 0.3-2.5μm solar band is about 97.3%, and the emissivity in the 8-13μm atmospheric transparent window is higher than 96%. At room temperature, the cooling power of the phase-change function thermally adaptive radiation cooling material can reach 115W / m2, which has extremely high cooling performance. Example 2

[0039] A method for preparing a thermally adaptive radiation cooling material with phase change function comprises the following steps:

[0040] S1. Preparation of LMA / MMA organic gel prepolymer solution: Methyl methacrylate (MMA), dodecyl acrylate (LMA), ethylene glycol dimethacrylate (EGDMA), PEG-30-dihydroxystearate and 2,2-diethoxyacetophenone (DEAP) were mixed in a volume ratio of 5:5:0.1:0.2:0.1 to obtain DA / MMA organic network prepolymer solution A;

[0041] S2. Preparation of inorganic nano-dispersion: Acrylic acid (AA), 2,2-diethoxyacetophenone (DEAP), polyethylene glycol, hexagonal boron nitride nanosheets and deionized water were fully stirred and mixed in a mass ratio of 0.5:0.05:1:2:10 to obtain an inorganic nano-dispersion B;

[0042] S3, preparation of two-phase heterogeneous gel: organic network prepolymer liquid A and inorganic nanodispersion liquid B were mixed in a volume ratio of 1:0.5-1:3, and sheared at a speed of 18000 rpm for 5 minutes at room temperature to obtain a precursor emulsion system C;

[0043] S4. Preparation of two-phase heterogeneous gel: The precursor emulsion system C is subjected to in-situ ultraviolet polymerization at 50°C to obtain a two-phase heterogeneous gel D.

[0044] S5. Preparation of thermally adaptive radiation cooling material with phase change function: Dry the two-phase heterogeneous gel D at 25°C for 12h. Example 3

[0045] A method for preparing a radiation cooling material with a thermal buffering function comprises the following steps:

[0046] S1. Preparation of DA / MMA organic gel prepolymer solution: Methyl methacrylate (MMA), behenyl acrylate (DA), ethylene glycol dimethacrylate (EGDMA), PEG-30-dihydroxystearate and 2,2-diethoxyacetophenone (DEAP) were mixed in a volume ratio of 5:5:0.1:0.2:0.1 to obtain DA / MMA organic network prepolymer solution A;

[0047] S2. Preparation of inorganic nano-dispersion: Acrylic acid (AA), 2,2-diethoxyacetophenone (DEAP), hexagonal boron nitride nanosheets and deionized water are fully stirred and mixed in a mass ratio of 0.5:0.05:2:10 to obtain an inorganic nano-dispersion B;

[0048] S3, preparation of two-phase heterogeneous gel: organic network prepolymer liquid A and inorganic nanodispersion liquid B were mixed in a volume ratio of 1:1-1:3, and sheared at a speed of 18000 rpm for 5 min at room temperature to obtain a precursor emulsion system C;

[0049] S4, preparation of two-phase heterogeneous gel: the precursor emulsion system C is subjected to in-situ ultraviolet polymerization at 50°C to obtain a two-phase heterogeneous gel D;

[0050] S5. Preparation of radiation cooling material with thermal buffering function: Dry the two-phase heterogeneous gel D at 25° C. for 12 h. Example 4

[0051] A method for preparing a thermally adaptive radiation cooling material with thermal infrared enhanced emission comprises the following steps:

[0052] S1. Preparation of DA / MMA organic gel prepolymer solution: Methyl methacrylate (MMA), behenyl acrylate (DA), ethylene glycol dimethacrylate (EGDMA), PEG-30-dihydroxystearate and 2,2-diethoxyacetophenone (DEAP) were mixed in a volume ratio of 5:5:0.1:0.2:0.1 to obtain DA / MMA organic network prepolymer solution A;

[0053] S2. Preparation of inorganic nano-dispersion: Acrylic acid (AA), 2,2-diethoxyacetophenone (DEAP), polyethylene glycol, zinc oxide particles and deionized water are fully stirred and mixed at a mass ratio of 0.5:0.05:1:2:10 to obtain inorganic nano-dispersion B;

[0054] S3, preparation of two-phase heterogeneous gel: organic network prepolymer liquid A and inorganic nano-dispersion liquid B were mixed in a volume ratio of 1:0.5 to 1:3, and sheared at a speed of 18000 rpm for 5 minutes at room temperature to obtain a precursor emulsion system C;

[0055] S4, preparation of two-phase heterogeneous gel: the precursor emulsion system C is subjected to in-situ ultraviolet polymerization at 50°C to obtain a two-phase heterogeneous gel D;

[0056] S5. Preparation of thermally adaptive radiation cooling material with thermal infrared enhanced emission: Dry the two-phase heterogeneous gel D at 25°C for 12 h. Example 5

[0057] A method for preparing a thermally adaptive radiation cooling material with a self-repairing function comprises the following steps:

[0058] S1. Preparation of DA / MMA organic gel prepolymer solution: Methyl methacrylate (MMA), octadecyl acrylate (SMA), ethylene glycol dimethacrylate (EGDMA), PEG-30-dihydroxystearate and 2,2-diethoxyacetophenone (DEAP) were mixed in a volume ratio of 3:7:0.05:0.2:0.1 to obtain DA / MMA organic network prepolymer solution A;

[0059] S2. Preparation of inorganic nano-dispersion: Acrylic acid (AA), 2,2-diethoxyacetophenone (DEAP), polyethylene glycol, alumina particles and deionized water are fully stirred and mixed at a mass ratio of 0.5:0.05:1:2:10 to obtain inorganic nano-dispersion B;

[0060] S3, preparation of two-phase heterogeneous gel: organic network prepolymer liquid A and inorganic nano-dispersion liquid B were mixed in a volume ratio of 1:0.5 to 1:3, and sheared at a speed of 18000 rpm for 5 minutes at room temperature to obtain a precursor emulsion system C;

[0061] S4, preparation of two-phase heterogeneous gel: the precursor emulsion system C is subjected to in-situ ultraviolet polymerization at 50°C to obtain a two-phase heterogeneous gel D;

[0062] S5. Preparation of thermally adaptive radiation cooling material with self-healing function: Dry the two-phase heterogeneous gel D at 25°C for 12 h. Example 6

[0063] A method for preparing a thermally adaptive radiation cooling material with a self-repairing function comprises the following steps:

[0064] S1. Preparation of paraffin organogel prepolymer solution: paraffin and PEG-30-dihydroxystearate are mixed in a volume ratio of 3:0.2 to obtain DA / MMA organic network prepolymer solution A;

[0065] S2. Preparation of inorganic nano-dispersion: Acrylic acid (AA), 2,2-diethoxyacetophenone (DEAP), polyethylene glycol, boron nitride nanosheets and deionized water are fully stirred and mixed in a mass ratio of 0.5:0.05:1:2:10 to obtain an inorganic nano-dispersion B;

[0066] S3, preparation of two-phase heterogeneous gel: organic network prepolymer liquid A and inorganic nano-dispersion liquid B were mixed in a volume ratio of 1:0.5 to 1:3, and sheared at a speed of 18000 rpm for 5 minutes at room temperature to obtain a precursor emulsion system C;

[0067] S4, preparation of two-phase heterogeneous gel: cooling the precursor emulsion system C at 20° C. to obtain a two-phase heterogeneous gel D;

[0068] S5. Preparation of thermally adaptive radiation cooling material with self-healing function: Dry the two-phase heterogeneous gel D at 25°C for 12 h.

[0069] In order to further illustrate the beneficial effects of the present invention, the following comparative examples are constructed:

[0070] Comparative Example 1

[0071] A method for preparing a dense structure radiation cooling material comprises the following steps:

[0072] Methyl methacrylate (MMA), octadecyl acrylate (SMA), ethylene glycol dimethacrylate (EGDMA), PEG-30-dihydroxystearate, hexagonal boron nitride nanosheets and 2,2-diethoxyacetophenone (DEAP) are mixed in a volume ratio of 3:7:0.05:0.2:0.1:2 to obtain an organic network prepolymer solution; and a dense structure radiation cooling material is obtained through in-situ polymerization under ultraviolet light.

[0073] By testing the solar spectrum reflectance and infrared spectrum emissivity of the material, such as Figure 3 As shown, the reflectivity of the heterogeneous hole phase change radiation cooling material can reach 97.3% in the range of 0.3-2.5 μm, and the emissivity can reach 96.5% in the range of 8-13 μm, which has excellent radiation cooling performance.

[0074] Comparing the phase change function of the thermally adaptive radiation cooling material with the surrounding ambient temperature, the temperature change results of the lower surface of the sample under direct sunlight in early summer are as follows: Figure 4 As shown in the figure, the maximum temperature of the thermally adaptive radiation cooling material can be reduced by an average of 12.5°C relative to the atmospheric environment temperature. This shows that the material has a good passive radiation cooling effect. The material is simple to make and is suitable for industrial production. It can be applied in the field of building energy conservation.

[0075] like Figure 5As shown in the figure, in outdoor devices, the temperature changes of the device surface covered by the phase-change thermally adaptive radiation cooling material and the device surface exposed to the outside will be significantly different after experiencing a heat pulse. The temperature of the device surface covered by the material is 20°C lower than the temperature of the device surface exposed to the outside, keeping the device within the operating temperature range of 60°C. This shows the good thermally adaptive radiation cooling function of the radiation cooling material, which can be applied to outdoor heat dissipation devices, outdoor electronic equipment and other fields where current traditional radiation cooling materials cannot be applied.

[0076] From the above examples, it can be seen that the phase-change function thermally adaptive radiation cooling material of the present invention can be used in a variety of different fields. It is suitable for application on the surface of building exterior walls. By covering the building surface with the material, the function of cooling at night and during the day can be achieved. It is also suitable for application on outdoor electronic equipment. By covering the equipment with the material, the function of heat dissipation and elimination of thermal pulses can be achieved. The phase-change function thermally adaptive radiation cooling material of the above example of the present invention has a reflectivity of 97.3% in the ultraviolet region-visible light-near infrared region of the 0.3-2.5 μm band, and an emissivity of 96.5% in the mid-infrared region (8-13 μm). It has a good effect in blocking solar radiation and can cover the main wavelength range of heat rays. Its self-repairing performance, self-cleaning and anti-pollution performance can effectively increase the service life of passive radiation cooling materials. The preparation method of the thermally adaptive radiation cooling material of the present invention is simple, low-cost, easy to implement, and worthy of wide application.

[0077] The above description is only illustrative rather than restrictive of the present invention. Those skilled in the art will understand that any modification, change or equivalent that can be made without departing from the spirit and scope defined by the claims will fall within the protection scope of the present invention.

Claims

1. A thermally adaptive radiation cooling material with phase change function, characterized in that: It consists of an organic network framework and a number of inorganic nano self-assembled cavities distributed inside the organic framework; The thermally adaptive radiation cooling material is prepared by the following method: S1. Fully stir and mix the oil-soluble monomer, oil-soluble crosslinking agent, photoinitiator and surfactant in a volume ratio of 1:0.01-0.05:0.01-0.05:0.01-0.1 to prepare an organic network prepolymer solution A; The oil-soluble monomer is selected from one or more of methyl methacrylate, ethyl methacrylate, butyl methacrylate, isobutyl methacrylate, hexyl methacrylate, octyl methacrylate, lauryl methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate, isobutyl acrylate, hexyl acrylate, octyl acrylate, lauryl acrylate, and a combination of one or more of octadecyl methacrylate, octadecyl acrylate, and behenyl acrylate; S2, the inorganic nano-element, the water-soluble monomer and the photoinitiator are fully stirred and mixed in a volume ratio of 1:0.5-0.2:0.005-0.02 to prepare an inorganic nano-dispersion liquid B; The inorganic nano-element is selected from one or more of boron nitride nanosheets, aluminum oxide particles, zinc oxide particles, titanium dioxide particles, silicon dioxide particles, calcium carbonate particles, magnesium oxide particles, and aluminum silicate particles; S3, mixing the organic network prepolymer liquid A and the inorganic nano-dispersion liquid B in a volume ratio of 1:1-5, and fully emulsifying to obtain a precursor emulsion system C with an aqueous phase as a dispersed phase and an organic phase as a continuous phase; S4, subjecting the precursor emulsion system C to in-situ polymerization under ultraviolet light to obtain a two-phase heterogeneous gel D; S5. After the internal hydrogel of the two-phase heterogeneous gel D evaporates at room temperature for 12 hours, a heterogeneous porous structure thermally adaptive radiation cooling material is finally obtained.

2. The thermally adaptive radiation cooling material with phase change function according to claim 1, characterized in that: The thermally adaptive radiation cooling material is prepared by the following method: S1. Fully stir and mix the oil-soluble monomer, oil-soluble crosslinking agent, photoinitiator and surfactant in a volume ratio of 1:0.01-0.05:0.01-0.05:0.01-0.1 to prepare an organic network prepolymer solution A; S2, inorganic nano-element, water-soluble monomer and photoinitiator are fully stirred and mixed in a volume ratio of 1:0.5:0.005-0.02 to prepare inorganic nano-dispersion liquid B; S3, mixing the organic network prepolymer liquid A and the inorganic nano-dispersion liquid B in a volume ratio of 1:1-5, and fully emulsifying to obtain a precursor emulsion system C with an aqueous phase as a dispersed phase and an organic phase as a continuous phase; S4, subjecting the precursor emulsion system C to in-situ polymerization under ultraviolet light to obtain a two-phase heterogeneous gel D; S5. After the internal hydrogel of the two-phase heterogeneous gel D is dried at room temperature for 12 hours, a heterogeneous porous structure thermally adaptive radiation cooling material is finally obtained.

3. A thermally adaptive radiation cooling material with phase change function according to any one of claims 1 to 2, characterized in that: The water-soluble monomer is selected from one or more of the following: Acrylamide, acrylic acid, N-hydroxymethyl acrylamide, polyethylene glycol, hydroxyethyl acrylamide, polyvinyl alcohol, 2-acrylamido-2-methylpropane sulfonic acid, vinyl pyrrolidone.

4. A thermally adaptive radiation cooling material with phase change function according to any one of claims 1 to 2, characterized in that: The oil-soluble cross-linking agent is selected from one or more of the following: Triethylene glycol dimethacrylate, diethylene glycol dimethacrylate, ethylene glycol dimethacrylate.

5. A thermally adaptive radiation cooling material with phase change function according to any one of claims 1 to 2, characterized in that: The photoinitiator is selected from one or more of the following: 2,2-diethoxyacetophenone, 1-hydroxycyclohexylacetophenone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 1-hydroxycyclohexylphenyl ketone, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

6. A thermally adaptive radiation cooling material with phase change function according to any one of claims 1 to 2, characterized in that: The surfactant is selected from one or more of the following: Polyglycerol fatty acid esters, diglycerol monolaurate, octadecyl phosphate, fatty alcohol polyoxyethylene ether phosphate, dihydroxystearate, laurate.

7. A method for preparing the thermally adaptive radiation cooling material with phase change function according to any one of claims 1 to 2, characterized in that: The following steps are involved: S1. Fully stir and mix the oil-soluble monomer, oil-soluble crosslinking agent, photoinitiator and surfactant in a volume ratio of 1:0.01-0.05:0.01-0.05:0.01-0.1 to prepare an organic network prepolymer solution A; S2, inorganic nano-element, water-soluble monomer and photoinitiator are fully stirred and mixed in a volume ratio of 1:0.5:0.005-0.02 to prepare inorganic nano-dispersion liquid B; S3, mixing the organic network prepolymer liquid A and the inorganic nano-dispersion liquid B in a volume ratio of 1:1-5, and shearing at a speed of 18000 rpm for 5 min at room temperature to obtain a precursor emulsion system C with an aqueous phase as a dispersed phase and an organic phase as a continuous phase; S4, subjecting the precursor emulsion system C to in-situ polymerization under ultraviolet light to obtain a two-phase heterogeneous gel D; S5. After the internal hydrogel of the two-phase heterogeneous gel D is dried at room temperature for 12 hours, the thermally adaptive radiation cooling material with heterogeneous pore structure is finally obtained.

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