Light-induced intelligent heat regulating material and preparation method thereof

Abstract

The invention discloses a light-induced intelligent heat regulating material and a preparation method thereof, and relates to the field of spaceflight materials.The light-induced intelligent heat regulating material is prepared by compounding an organic base material and an inorganic material, the prepared material has a certain difference in emissivity before and after ultraviolet irradiation, and has certain reversible repeatability after light-shielding recovery; the preparation process is simple and convenient, precise and complex instruments and equipment are not needed, the production cost is low, and the problems that an existing aerospace thermal control device is precise and complex, and an additional stimulation source is needed are solved.

Description

Technical Field

[0001] The invention relates to the field of aerospace materials, and in particular to a light-induced intelligent thermal regulating material and a preparation method thereof. Background Art

[0002] Satellites are in the vacuum environment of space and cannot transfer heat through convection and conduction. The most efficient way to transfer heat is through radiation. Therefore, radiation-controlled heat exchange is an important way for satellites to achieve intelligent thermal control. The radiation capacity of an object's surface is positively correlated with the surface emissivity of the object itself and the temperature difference between the object and the environment. When the temperature of the object and the environment is constant, the surface emissivity of the object plays a decisive role in the radiation energy of the object. With the reports of the "radiative cooling" phenomenon and the miniaturization of the spacecraft field, various high-emissivity, low-emissivity and infrared-transparent materials have become new research hotspots. Materials with variable emissivity characteristics can use atmospheric windows to achieve heat exchange between objects and near space, allowing objects to maintain ambient temperature under sunlight, which is the focus of material researchers.

[0003] In response to the complex and changeable temperature environment faced by satellites in space, variable emissivity materials / devices have emerged. Unlike traditional fixed emissivity devices, the intelligent thermal control materials / devices currently being researched and applied can adjust their own emissivity under control signals (such as temperature and voltage) to achieve intelligent thermal control. Variable emissivity materials have the following advantages: ① More efficient and intelligent, no additional electrical drive signal stimulation is required, and the emissivity can be adjusted autonomously according to the ambient temperature; ② Lighter and smaller in size; ③ Less energy consumption, no additional energy supply is required. Among variable emissivity materials, thermochromic materials represented by VO2 and electrochromic materials represented by WO3 have shown better thermal control effects than non-intelligent thermal control materials, but existing aerospace thermal control devices are generally sophisticated and complex and require external stimulation sources. Summary of the invention

[0004] In order to solve the problems of the prior art, the purpose of the present invention is to overcome the shortcomings of the existing technology and provide a photosensitive intelligent thermal control material and a preparation method thereof. The material is prepared by compounding an inorganic material that changes color in response to ultraviolet light, an infrared transparent organic base material and a stabilizer. The material has ultraviolet light as an excitation condition to achieve a change in the reflectivity of the composite material in the visible light band, thereby changing the color parameters of the sample and changing the emissivity in the infrared light band. The preparation method is simple, does not require sophisticated instruments and equipment, has a low production cost, and can autonomously adjust the emissivity according to the environment, solving the problem that existing aerospace thermal control devices are sophisticated and complex and require an external stimulus source.

[0005] One of the purposes of the present invention is to provide a method for preparing a light-induced intelligent thermal regulating material, comprising the following steps:

[0006] S1. preparing four solutions: a base solution containing an organic substrate, a cation solution, an anion solution and a stabilizer solution;

[0007] S2, dropwise adding the cationic solution into the base solution, and then slowly dropwise adding the anionic solution, stirring until the reaction is complete, to obtain a reaction solution;

[0008] S3, slowly adding the stabilizer solution dropwise to the reaction solution, stirring evenly, to obtain an initial solution;

[0009] S4, placing the initial solution in a mold, performing a heating treatment to evaporate the solvent in the initial solution, and then further heating the solution to completely melt the organic substrate, stopping the heating, cooling the solution, and performing a demolding treatment to obtain a photosensitive intelligent thermal control material sample.

[0010] Preferably, the solvents in the substrate solution, the cationic solution, the anionic solution and the stabilizer solution are polar solvents, such as a mixture of any one or more of ethanol, deionized water, ethylene glycol, propylene glycol, isopropanol and acetone.

[0011] Preferably, the organic substrate is an infrared transparent organic material, such as at least one of polyethylene, polypropylene, polymethyl methacrylate, waterborne polyurethane, silicone resin, and styrene acrylic emulsion.

[0012] Preferably, the cations and anions in the cationic solution and the anionic solution can react to generate an inorganic material that changes color in response to ultraviolet light.

[0013] Preferably, the solute in the stabilizer solution is at least one of copper halide, cuprous halide, cupric oxide and cuprous oxide.

[0014] Further preferably, the mass ratio of the organic substrate to the polar solvent in the base solution is 1:2.

[0015] Further preferably, the ratio of the amount of cationic substances in the cationic solution, the amount of anionic substances in the anionic solution and the amount of copper ions in the stabilizer solution is 1:1:1-7.

[0016] More preferably, the mass fraction of the inorganic material synthesized by the reaction of the cation and the anion in the photo-induced intelligent thermal regulation material sample is 0.01-2 wt %.

[0017] The second purpose of the present invention is to provide a photo-induced intelligent thermal control material prepared by the preparation method of the photo-induced intelligent thermal control material, wherein the photo-induced intelligent thermal control material includes an inorganic material that changes color in response to ultraviolet light, an infrared transparent organic material and a stabilizer, and the mass fraction of the inorganic material in the photo-induced intelligent thermal control material is 0.01 to 2 wt%.

[0018] Preferably, after 5 minutes of ultraviolet irradiation, the light emissivity adjustment value of the photosensitive intelligent thermal regulating material is 0.072, the light emissivity adjustment rate is 9.4%, and the secondary light emissivity adjustment rate after recovery from light protection is 7.4%, which has good reversibility.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention provides a method for preparing a light-induced intelligent thermal regulating material. A simple in-situ synthesis method is used to directly synthesize inorganic material particles with ultraviolet response color change in an infrared transparent organic material. The method is convenient for controlling the amount of material added, and simple heating can evaporate the solvent and melt the organic substrate. The material can be solidified and demolded after cooling. The material has simple equipment and low requirements for the preparation environment. The raw materials are common, the cost is low, the preparation method is simple, the production cycle is short, and the process parameters in the preparation process can be obtained using common instruments and equipment. The material is suitable for industrialization and commercial use.

[0021] The photosensitive intelligent thermal regulating material prepared by the present invention is an inorganic material that changes its emissivity and color in response to ultraviolet light without the need for an external device stimulation source, and can achieve changes in radiation performance. It can be used in the aerospace field to effectively simplify functional components and reduce weight.

[0022] The light-induced intelligent heat regulating material prepared by the present invention can adjust the emissivity regulating ability by adjusting the content of inorganic materials, material thickness and the proportion of stabilizers.

[0023] The photosensitive intelligent thermal control material prepared by the present invention is a passive thermal control material. It is light in color before photochromism and dark in color after photochromism. Its heat absorption and heat dissipation performance in the sunlight band changes. At the same time, the emissivity of the material in the mid- and far-infrared bands also changes before and after the color change, thereby enhancing its thermal control performance.

[0024] The light-induced intelligent thermal regulating material prepared by the present invention was tested for its secondary illumination emissivity regulation rate after recovery from light avoidance, and it was found that it had good reversibility.

[0025] The photosensitive intelligent thermal regulating material prepared by the present invention has the advantages of being non-toxic or of low toxicity, high thermal stability, resistance to chemical corrosion, green and environmentally friendly, low cost, and simple preparation process. The discovery of inorganic photochromic materials with variable emissivity characteristics has great practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The actual pictures of the samples prepared in Example 1 of the present invention, wherein (A) is before irradiation, (B) is after the first ultraviolet irradiation for 5 minutes, (C) is after being shielded from light for 24 hours, and (D) is after the second irradiation;

[0027] Figure 2 The SEM images of the inorganic silver chloride in the sample prepared in Example 1 of the present invention, (A) is before irradiation, and (B) is after the first ultraviolet irradiation for 5 minutes;

[0028] Figure 3 The test results of the light emission rate regulation rate of each embodiment of the present invention;

[0029] Figure 4 The test results of the secondary illumination emissivity regulation rate of some embodiments of the present invention are as follows;

[0030] Figure 5 The test results of the light emission rate regulation rate of some embodiments of the present invention are as follows;

[0031] Figure 6 The test results of the light emission rate regulation rate of some embodiments of the present invention are as follows;

[0032] Figure 7 These are the test results of the light emissivity regulation rate of some embodiments of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Embodiment 1:

[0035] A method for preparing a light-induced intelligent thermal regulating material comprises the following steps:

[0036] S1. preparing four solutions: a base solution containing an organic substrate, a cation solution, an anion solution and a stabilizer solution;

[0037] S2, dropwise adding the cationic solution into the base solution, and then slowly dropwise adding the anionic solution, stirring until the reaction is complete, to obtain a reaction solution;

[0038] S3, slowly adding the stabilizer solution to the reaction solution and stirring evenly to obtain an initial solution;

[0039] S4, placing the initial solution in a mold and performing a heating treatment to evaporate the solvent in the initial solution, and then further heating the organic substrate until it is completely melted, stopping the heating, cooling it, and performing a demolding treatment to obtain a photosensitive intelligent thermal control material sample.

[0040] It should be noted that the solvents in the base solution, cationic solution, anionic solution and stabilizer solution are polar solvents, such as a mixture of any one or more of ethanol, deionized water, ethylene glycol, propylene glycol, isopropanol and acetone. In this embodiment, the polar solvent is ethanol.

[0041] It should be noted that the organic substrate is an infrared transparent organic material, such as at least one of polyethylene, polypropylene, polymethyl methacrylate, waterborne polyurethane, silicone resin, and styrene acrylic emulsion. In this embodiment, the organic substrate is polyethylene.

[0042] It should be noted that the cations and anions in the cationic solution and the anionic solution can react to generate an inorganic material that changes color in response to ultraviolet light, such as silver halide. That is to say, the cationic solution is a silver ion solution, and the anionic solution is a halide ion solution. For example, the solute in the anionic solution is at least one of hydrochloric acid, hydrobromic acid, hydroiodic acid, potassium halide, sodium halide, iron halide, and barium halide, and does not include fluoride. In this embodiment, the solute in the cationic solution is silver nitrate, and the solute in the anionic solution is hydrochloric acid. The inorganic material synthesized after the above steps is silver chloride.

[0043] It should be noted that the solute in the stabilizer solution is at least one of copper halide, cuprous halide, cupric oxide, and cuprous oxide. In this embodiment, cupric chloride is selected.

[0044] In this embodiment, 1 g of polyethylene and 2 g of ethanol were mixed evenly to prepare a base solution, and magnetic stirring was performed evenly until the solid was completely dissolved.

[0045] In this embodiment, in each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5, and the mass fraction of silver chloride in the light-induced intelligent thermal adjustment material sample is 0.175wt%, that is,

[0046] In this embodiment, equal volumes of an ethanol solution containing silver ions, an ethanol solution containing chloride ions, and a solution containing copper ions were prepared, wherein the silver ion concentration was 0.01 mol / L, the chloride ion concentration was 0.01 mol / L, and the copper ion concentration was 0.05 mol / L.

[0047] In this embodiment, step S2 is specifically as follows: dripping an ethanol solution containing chloride ions into an ethanol solution containing silver ions while stirring, and stirring for about 30 minutes until the reaction is complete, and the obtained reaction solution is a silver chloride solution.

[0048] In this embodiment, step S3 specifically includes: dropping the copper chloride solution into the silver chloride solution, and stirring for about 5 minutes until the mixture is evenly mixed.

[0049] In this embodiment, the mold selected in step S4 is a circular disk made of aluminum foil.

[0050] In this embodiment, the temperature of the heating treatment in step S4 is 60° C., and the temperature of the further heating treatment is 130° C. In the actual implementation process, the temperature is controlled according to the different polar solvents and organic substrates selected.

[0051] It should be noted that after the preparation of the photosensitive intelligent thermal control material sample is completed, in order to prevent the escape of halogen, it is preferred that the sample is stored in a vacuum environment, such as using a vacuum machine to seal a vacuum bag to store the sample.

[0052] Embodiment 2:

[0053] The steps of this embodiment are basically the same as those of Embodiment 1, except that:

[0054] In this embodiment, 2 g of polyethylene and 4 g of ethanol were mixed evenly to prepare a base solution, and magnetic stirring was performed evenly until the solid was completely dissolved.

[0055] Embodiment 3:

[0056] The steps of this embodiment are basically the same as those of Embodiment 1, except that:

[0057] In this embodiment, 3 g of polyethylene and 6 g of ethanol were mixed evenly to prepare a base solution, and magnetic stirring was performed evenly until the solid was completely dissolved.

[0058] Figure 1 This is a physical picture of the sample prepared in Example 1. It can be seen that 5 minutes after the first ultraviolet irradiation, the overall brightness of the sample decreases and the color deepens after simulated ultraviolet irradiation.

[0059] Figure 2 This is a SEM image of the inorganic silver chloride in the sample prepared in Example 1. The particle size of the silver chloride particles after the first ultraviolet irradiation for 5 minutes is significantly smaller than that of the silver chloride particles before irradiation.

[0060] The thicknesses of the samples obtained in Examples 1 to 3 were 0.6 mm, 1.2 mm and 1.8 mm, respectively. The samples obtained in Examples 1 to 3 were tested for light emissivity adjustment rate. The light emissivity adjustment value of Example 1 was 0.072, and the light emissivity adjustment rates of the three samples were 9.4%, 2.8% and 2.3%, respectively (as shown in Table 1). Figure 3 As shown), Figure 4 As shown, the test result of the secondary illumination emissivity regulation rate of Example 1 is 7.4%, and the reversibility is good.

[0061] Embodiment 4:

[0062] The steps of this embodiment are basically the same as those of Embodiment 1, except that:

[0063] In this embodiment, in each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5, and the mass fraction of silver chloride in the light-induced intelligent thermal adjustment material sample is 0.010wt%, that is,

[0064] Embodiment 5:

[0065] The steps of this embodiment are basically the same as those of Embodiment 1, except that:

[0066] In this embodiment, in each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5, and the mass fraction of silver chloride in the light-induced intelligent thermal adjustment material sample is 0.070wt%, that is,

[0067] Embodiment 6:

[0068] The steps of this embodiment are basically the same as those of Embodiment 1, except that:

[0069] In this embodiment, in each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5, and the mass fraction of silver chloride in the light-induced intelligent thermal adjustment material sample is 0.350wt%, that is,

[0070] Embodiment 7:

[0071] The steps of this embodiment are basically the same as those of Embodiment 1, except that:

[0072] In this embodiment, in each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5, and the mass fraction of silver chloride in the light-induced intelligent thermal adjustment material sample is 2.000wt%, that is,

[0073] like Figure 3 As shown, the light emissivity regulation rates of the samples obtained in Examples 4 to 7 are 2.8%, 4.5%, 5.3% and 4.7%, respectively. With the increase of the silver chloride content, the light emissivity regulation increases first and then decreases.

[0074] Embodiment 8:

[0075] The steps of this embodiment are basically the same as those of Embodiment 1, except that:

[0076] In this embodiment, in each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:1, and the mass fraction of silver chloride in the light-induced intelligent thermal adjustment material sample is 0.175wt%, that is,

[0077] Embodiment 9:

[0078] The steps of this embodiment are basically the same as those of Embodiment 1, except that:

[0079] In this embodiment, in each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:2, and the mass of silver chloride in the light-induced intelligent thermal adjustment material sample is 0.175wt%, that is,

[0080] Embodiment 10:

[0081] The steps of this embodiment are basically the same as those of Embodiment 1, except that:

[0082] In this embodiment, in each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:7, and the mass fraction of silver chloride in the light-induced intelligent thermal adjustment material sample is 0.175wt%, that is,

[0083] like Figure 3 and Figure 4 As shown, the light emissivity regulation rates of the samples obtained in Examples 8 to 10 are 6.1%, 5.5% and 8.0%, respectively. With the increase of the cupric chloride content, the light emissivity regulation rate first increases and then decreases. The secondary light emissivity regulation rates of the three samples are 3.1%, 4.4% and 3.7%, respectively.

[0084] Embodiment 11:

[0085] The steps of this embodiment are basically the same as those of Embodiment 4, except that:

[0086] The polyethylene was replaced by high-density polyethylene, and the amount used was the same as the polyethylene in Example 4, which was 1 g. In each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5. The mass fraction of silver chloride in the light-induced intelligent thermal regulating material sample was 0.010 wt%, that is,

[0087] Embodiment 12:

[0088] The steps of this embodiment are basically the same as those of Embodiment 5, except that:

[0089] The polyethylene was replaced by high-density polyethylene, and the amount used was the same as the polyethylene in Example 5, which was 1 g. In each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5. The mass fraction of silver chloride in the light-induced intelligent thermal regulating material sample was 0.070 wt%, that is,

[0090] Embodiment 13:

[0091] The steps of this embodiment are basically the same as those of Embodiment 1, except that:

[0092] The polyethylene was replaced by high-density polyethylene, and the amount used was the same as the polyethylene in Example 1, which was 1 g. In each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5. The mass fraction of silver chloride in the photosensitive intelligent thermal regulating material sample was 0.175wt%, that is,

[0093] Embodiment 14:

[0094] The steps of this embodiment are basically the same as those of Embodiment 6, except that:

[0095] The polyethylene was replaced by high-density polyethylene, and the amount used was the same as that of the polyethylene in Example 6, which was 1 g. In each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5. The mass fraction of silver chloride in the light-induced intelligent thermal regulating material sample was 0.350 wt%, that is,

[0096] Embodiment 15:

[0097] The steps of this embodiment are basically the same as those of Embodiment 7, except that:

[0098] The polyethylene was replaced by high-density polyethylene, and the amount used was the same as the polyethylene in Example 7, which was 1 g. In each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5. The mass fraction of silver chloride in the photosensitive intelligent thermal regulating material sample was 2.000wt%, that is,

[0099]

[0100] like Figure 5 As shown, the light emissivity regulation rates of the samples prepared in Examples 11 to 15 are 2.5%, 4.3%, 8.5%, 5.0% and 4.1%, respectively. With the increase of the silver chloride content, the light emissivity regulation increases first and then decreases.

[0101] Embodiment 16:

[0102] The steps of this embodiment are basically the same as those of Embodiment 4, except that:

[0103] The polyethylene was replaced by polypropylene, and the amount used was the same as the polyethylene in Example 4, which was 1 g. In each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5. The mass fraction of silver chloride in the photosensitive intelligent thermal regulating material sample was 0.010 wt%, that is,

[0104] Embodiment 17:

[0105] The steps of this embodiment are basically the same as those of Embodiment 5, except that:

[0106] The polyethylene was replaced by polypropylene, and the amount used was the same as the polyethylene in Example 5, which was 1 g. In each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5. The mass fraction of silver chloride in the light-induced intelligent thermal regulating material sample was 0.070 wt%, that is,

[0107] Embodiment 18:

[0108] The steps of this embodiment are basically the same as those of Embodiment 1, except that:

[0109] The polyethylene was replaced by polypropylene, and the amount used was the same as the polyethylene in Example 1, which was 1 g. In each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5. The mass fraction of silver chloride in the light-induced intelligent thermal regulating material sample was 0.175wt%, that is,

[0110] Embodiment 19:

[0111] The steps of this embodiment are basically the same as those of Embodiment 6, except that:

[0112] The polyethylene was replaced by polypropylene, and the amount used was the same as the polyethylene in Example 6, which was 1 g. In each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5. The mass fraction of silver chloride in the photosensitive intelligent thermal regulating material sample was 0.350 wt%, that is,

[0113] Embodiment 20:

[0114] The steps of this embodiment are basically the same as those of Embodiment 7, except that:

[0115] The polyethylene was replaced by polypropylene, and the amount used was the same as the polyethylene in Example 7, which was 1 g. In each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5. The mass fraction of silver chloride in the photosensitive intelligent thermal regulating material sample was 2.000wt%, that is,

[0116]

[0117] like Figure 6 As shown, the light emissivity regulation rates of the samples prepared in Examples 16 to 20 are 1.9%, 3.9%, 8.9%, 5.2% and 3.8%, respectively. As the silver chloride content increases, the light emissivity regulation increases first and then decreases.

[0118] Embodiment 21:

[0119] The steps of this embodiment are basically the same as those of Embodiment 4, except that:

[0120] In this embodiment, cupric chloride is replaced by cuprous chloride. In each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5. The mass fraction of silver chloride in the light-induced intelligent thermal control material sample is 0.010wt%, that is,

[0121] Embodiment 22:

[0122] The steps of this embodiment are basically the same as those of Embodiment 5, except that:

[0123] In this embodiment, cupric chloride is replaced by cuprous chloride. In each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5. The mass fraction of silver chloride in the light-induced intelligent thermal adjustment material sample is 0.070wt%, that is,

[0124] Embodiment 23:

[0125] The steps of this embodiment are basically the same as those of Embodiment 1, except that:

[0126] In this embodiment, cupric chloride is replaced by cuprous chloride. In each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5. The mass fraction of silver chloride in the light-induced intelligent thermal regulating material sample is 0.175wt%, that is,

[0127] Embodiment 24:

[0128] The steps of this embodiment are basically the same as those of Embodiment 6, except that:

[0129] In this embodiment, cupric chloride is replaced by cuprous chloride. In each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5. The mass fraction of silver chloride in the light-induced intelligent thermal adjustment material sample is 0.350wt%, that is,

[0130] Embodiment 25:

[0131] The steps of this embodiment are basically the same as those of Embodiment 7, except that:

[0132] In this embodiment, cupric chloride is replaced by cuprous chloride. In each solution, the amount of silver ion substance: the amount of chloride ion substance: the amount of copper ion substance = 1:1:5. The mass fraction of silver chloride in the light-induced intelligent thermal adjustment material sample is 2.000wt%, that is,

[0133] like Figure 7 As shown, the light emissivity regulation rates of the samples prepared in Examples 21 to 25 are 2.3%, 4.9%, 9.1%, 5.7% and 5.2%, respectively. As the silver chloride content increases, the light emissivity regulation increases first and then decreases.

[0134] It should be noted that the samples in the above embodiments were tested for light emissivity regulation rate. The light emissivity regulation rate was obtained by comparing the emissivity of the samples in the mid- and far-infrared light bands before and after 5 minutes of ultraviolet illumination. The secondary light emissivity regulation rate was tested after the first ultraviolet illumination for 5 minutes, the samples were protected from light for 24 hours, and then ultraviolet illumination was performed again for 5 minutes. The corresponding light emissivity adjustment values ​​of the samples before and after the secondary ultraviolet illumination were compared to obtain the secondary light emissivity regulation rate. In addition, the color parameters of the samples in the above embodiments changed after simulated ultraviolet illumination, and the overall brightness decreased and the color deepened.

[0135] It should be noted that in the above embodiments, in order to make the materials dissolve quickly, polyethylene and high-density polyethylene are selected as powders with a particle size range of 20 to 25 μm. In actual implementation, powder materials or block materials with other particle sizes can also be selected. It is only necessary to adjust the parameters when preparing the base solution to make the prepared base solution uniform.

[0136] In summary, the samples prepared in the above embodiments, when excited by ultraviolet light, have their color parameters changed and their emissivity in the infrared light band changed, that is, they have color-changing and thermal-adjusting properties.

[0137] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is limited by the attached embodiments and their equivalents.

Claims

1. A method for preparing a light-induced intelligent thermal regulating material, characterized in that: The steps include: S1. preparing four solutions: a base solution containing an organic substrate, a cation solution, an anion solution and a stabilizer solution; S2, dropwise adding the cationic solution into the base solution, and then slowly dropwise adding the anionic solution, stirring until the reaction is complete, to obtain a reaction solution; S3, slowly adding the stabilizer solution dropwise to the reaction solution, stirring evenly, to obtain an initial solution; S4, placing the initial solution in a mold, performing a heating treatment to evaporate the solvent in the initial solution, and then further heating the solution to completely melt the organic substrate, stopping the heating, cooling the solution, and performing a demolding treatment to obtain a photosensitive intelligent thermal control material sample.

2. The method for preparing the light-induced intelligent thermal regulating material according to claim 1, characterized in that: The solvents in the base solution, the cation solution, the anion solution and the stabilizer solution are polar solvents.

3. The method for preparing the light-induced intelligent thermal regulating material according to claim 2, characterized in that: The organic substrate is an infrared transparent organic material.

4. The method for preparing the light-induced intelligent thermal regulating material according to claim 2, characterized in that: The cations and anions in the cation solution and the anion solution can react to generate an inorganic material that changes color in response to ultraviolet light.

5. The method for preparing the light-induced intelligent thermal regulating material according to claim 2, characterized in that: The solute in the stabilizer solution is at least one of copper halide, cuprous halide, cupric oxide and cuprous oxide.

6. The method for preparing the light-induced intelligent thermal regulating material according to claim 2, characterized in that: The mass ratio of the organic substrate to the polar solvent in the base solution is 1:

2.

7. The method for preparing the light-induced intelligent thermal regulating material according to claim 5, characterized in that: The ratio of the amount of cationic substances in the cationic solution, the amount of anionic substances in the anionic solution and the amount of copper ions in the stabilizer solution is 1:1:1-7.

8. The method for preparing the light-induced intelligent thermal regulating material according to claim 7, characterized in that: The mass fraction of the inorganic material synthesized by the reaction of the cation and the anion in the photo-induced intelligent thermal regulation material sample is 0.01-2 wt %.

9. A photosensitive intelligent thermal regulating material prepared by the method for preparing a photosensitive intelligent thermal regulating material according to any one of claims 1 to 8, characterized in that: The photo-induced intelligent thermal regulation material comprises: an inorganic material that changes color in response to ultraviolet light, an infrared transparent organic material and a stabilizer. The mass fraction of the inorganic material in the photo-induced intelligent thermal regulation material is 0.01-2 wt %.

10. The light-induced intelligent thermal regulating material according to claim 9, characterized in that: After the light-induced intelligent heat regulating material is exposed to ultraviolet light for 5 minutes, the light emissivity adjustment value is 0.072, the light emissivity adjustment rate is 9.4%, and the secondary light emissivity adjustment rate after recovery from light avoidance is 7.4%.

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