Organic charge transfer eutectic with near-infrared photothermal characteristic and preparation method of optical heat storage fiber of organic charge transfer eutectic

Abstract

The invention discloses a preparation method of an organic charge transfer eutectic with near-infrared photothermal characteristic and a photothermal fiber of the organic charge transfer eutectic, which comprises the following steps: selecting aniline compounds and / or naphthylamine compounds as electron donors and benzoquinone compounds with strong electron affinity as electron acceptors from the aspects of molecular structure and energy level matching; the composition and the structure of the eutectic material are adjusted by adopting a solution self-assembly method, so that the band gap structure of the organic eutectic is changed, thereby realizing red shift absorption and controllably synthesizing the organic near-infrared low-dimensional photo-thermal eutectic material with regular morphology and uniform size, namely the organic charge transfer eutectic with near-infrared photo-thermal characteristics. According to the invention, a micro material is macroscopically processed by a wet spinning method, the structure and function integrated light heat storage fiber with excellent light and heat performance is prepared, and a new strategy is provided for research on intelligent fibers based on organic semiconductors and preparation of functional fiber fabrics based on organic crystalline materials.

Description

Technical Field

[0001] The present invention relates to the technical field of organic photothermal materials, and in particular to a method for preparing an organic charge transfer eutectic having near-infrared photothermal properties and a photothermal storage fiber thereof. Background Art

[0002] Organic photothermal materials have shown great potential for scientific research and commercial applications in the field of low-cost, thin, and flexible optoelectronic devices due to their high photothermal conversion efficiency, tailorable molecular structure, low-temperature solution processing capabilities, and adjustable physical and chemical properties. However, the current design and preparation process of organic photothermal materials based on single-molecule systems is relatively complex and cumbersome, which to some extent limits their promotion in practical applications (Adv. Sci. 2023, 10, 2206830).

[0003] In order to solve this problem, organic eutectic materials have become a new research direction due to their unique molecular arrangement and synergistic effects among multiple components. Organic eutectics can retain the properties of a single component and produce novel optoelectronic properties through intermolecular interactions. Moreover, through solution self-assembly methods, many excellent properties that single components do not have can be obtained. In organic eutectics, the strong charge transfer (CT) effect between electron donors and acceptors enables the charge to be transferred from the highest occupied molecular orbital (HOMO) of the donor to the lowest unoccupied molecular orbital (LUMO) of the acceptor, forming a new energy level structure and realizing effective regulation of the energy level. This characteristic provides a new idea for the development of organic photothermal materials with excellent light absorption capabilities (ACSNano 2022, 16, 15000-15007).

[0004] However, the current design and development of organic donor-acceptor eutectic photothermal materials still faces many challenges. First, due to the lack of in-depth understanding of the relationship between molecular structure and condensed structure and optoelectronic properties, the selection of components is limited, which makes it difficult to develop organic eutectic materials with excellent performance. Secondly, the stability issue is still an important factor restricting the application of organic eutectic photothermal materials. In addition, the lack of programmable substrates also limits the application prospects of organic eutectic photothermal materials in new thermal storage smart fibers and other fields (Angew. Chem. Int. Ed. 2018, 57, 3963-3967). Therefore, it is urgent to design and synthesize an organic eutectic material with high near-infrared photothermal efficiency for the development of smart photothermal storage fibers. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide an organic charge transfer eutectic with near-infrared photothermal properties and a method for preparing its photothermal storage fiber, and to realize the transformation of organic photothermal eutectic materials from microscopic to macroscopic through wet spinning, and successfully prepare photothermal storage fibers based on organic charge transfer eutectics.

[0006] The above object of the present invention is achieved through the following technical solutions:

[0007] The present invention provides a method for preparing an organic charge transfer eutectic with near-infrared photothermal properties, comprising the following steps:

[0008] (1) using an aniline compound and / or a naphthylamine compound as an electron donor and a benzoquinone compound as an electron acceptor, adding a good organic solvent at a molar ratio of the electron donor to the acceptor molecule of (1-5):(1-5) to obtain an electron donor-acceptor stock solution with a concentration of 0.5-5 mmol / L;

[0009] (2) adding a poor organic solvent to the electron donor-acceptor stock solution obtained in step (1), and removing the solvent to obtain an organic charge transfer eutectic with near-infrared photothermal properties.

[0010] The present invention selects aniline compounds and / or naphthylamine compounds as electron donors and benzoquinone compounds with strong electron affinity as electron acceptors from the aspects of molecular structure and energy level matching, adopts a solution self-assembly method, adjusts the composition and structure of the eutectic material, changes the band gap structure of the organic eutectic, thereby achieving red-shift absorption, and regulates the CT effect by the electron-pulling ability of the electron acceptor, thereby controllably synthesizing an organic near-infrared low-dimensional photothermal eutectic material with regular morphology and uniform size, that is, an organic charge transfer eutectic with near-infrared photothermal properties.

[0011] Further, in step (1), the electron donor is selected from one or more of aniline, N,N-dimethylaniline, p-aminophenol, o-aminophenol, phenylethylamine, diaminobenzene, aminotoluene, 2-bromoaniline, 2-iodoaniline, 3-fluoroaniline, 3-bromoaniline, 3-iodoaniline, 4-fluoroaniline, 4-iodoaniline, diphenylamine, benzidine, 1-naphthylamine, β-naphthylamine, 3-bromo-1-naphthylamine, 5-bromo-2-naphthylamine, N-acetylnaphthylamine, N-ethyl-2-naphthylamine, N,N-dimethyl-2-naphthylamine, N,N-dimethyl-1-naphthylamine, 4-ethyl-1-naphthylamine, 1,1'-dinaphthylamine and 1,2'-dinaphthylamine, and the structural formula is as follows:

[0012]

[0013] Further, in step (1), the electron acceptor is selected from p-benzoquinone, methyl benzoquinone, 2-chloro-1,4-benzoquinone, 2-bromo-1,4-benzoquinone, 2,5-dichloro-1,4-benzoquinone, 2,5-dibromo-1,4-benzoquinone, 2,6-dichloro-p-benzoquinone, 2,6-dibromo-p-benzoquinone, 2,5-dimethyl-1,4-benzoquinone, 2-chloro-5-methyl-1,4-benzoquinone, 2,6-diiodo-p-benzoquinone, 2,6-dimethyl-p-benzoquinone, One or more of benzoquinone, tetrachlorobenzoquinone, tetrafluorobenzoquinone, o-tetrachlorobenzoquinone, tetrabromo-1,4-benzoquinone, tetramethyl-1,4-benzoquinone, 2,3,5,6-tetra(amino)-p-benzoquinone, tetrahydroxy-1,4-benzoquinone hydrate, 2,3-dichloro-5,6-dicyano-p-benzoquinone, 7,7,8,8-tetracyanobenzoquinodimethane and 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyanodimethyl-p-benzoquinone, with the following structural formula:

[0014]

[0015] Furthermore, in step (1), the good organic solvent is selected from one or more of dichloromethane, chloroform, tetrahydrofuran, acetonitrile and chlorobenzene; in step (2), the poor organic solvent is selected from one or more of ethanol, methanol, isopropanol, acetonitrile, n-hexane and cyclohexane; and the volume ratio of the good organic solvent in step (1) to the poor organic solvent in step (2) is (1-10):(1-10).

[0016] The present invention protects an organic charge transfer eutectic with near-infrared photothermal properties prepared by the above method.

[0017] The present invention provides a method for preparing a light-heat storage fiber based on an organic charge transfer eutectic with near-infrared photothermal properties, comprising the following steps:

[0018] S1. dissolving an organic polymer in an organic solvent to obtain an initial spinning stock solution with a concentration of 5-25 g / L; adding the above-mentioned organic charge transfer eutectic having near-infrared photothermal properties to the initial spinning stock solution to obtain a wet spinning stock solution;

[0019] S2. The wet spinning reserve solution obtained in S1 is used for wet spinning, and after passing through a coagulation bath, the light heat storage fiber based on the organic charge transfer eutectic with near-infrared photothermal properties is obtained.

[0020] The present invention further adopts wet spinning to prepare a light-heat storage fiber with integrated structure and function, which has uniform thickness, high elasticity and excellent light-heat performance.

[0021] Further, in S1, the organic polymer can be used for wet spinning, and the organic polymer is selected from one or more of polyethylene terephthalate (PET), polylactic acid (PLA), polyacrylonitrile (PAN), polyurethane (PU), polyether sulfone (PES) and polyvinyl alcohol (PVA).

[0022] Furthermore, in S1, the organic solvent is selected from one or more of dichloromethane, tetrahydrofuran, N,N-dimethylformamide, dimethylsulfinamide, acetone and toluene, and can be a mixture of dichloromethane and N,N-dimethylformamide, a mixture of tetrahydrofuran and N,N-dimethylformamide, a mixture of dichloromethane and dimethylsulfinamide, or a mixture of tetrahydrofuran and dimethylsulfinamide.

[0023] In a specific embodiment, in S1, the organic charge transfer eutectic with near-infrared photothermal properties may be first dissolved in an organic solvent, and then the initial spinning reserve solution is added to obtain a wet spinning reserve solution.

[0024] Furthermore, in S2, the draft ratio of the wet spinning is 1:(0.2-2.5).

[0025] Furthermore, in S2, the pinhole size used in the wet spinning is 16-22G.

[0026] Furthermore, in S2, the coagulation bath is water and / or ethanol.

[0027] Furthermore, in S2, the temperature of the coagulation bath is 10-30°C.

[0028] The present invention protects a light-heat storage fiber based on an organic charge transfer eutectic with near-infrared photothermal properties, which is prepared by the above method.

[0029] Beneficial effects of the present invention:

[0030] The present invention is based on eutectic engineering, and realizes red-shifted absorption by regulating the CT effect between donors and acceptors and optimizing the molecular stacking mode. It also adopts a solution self-assembly method to simply and quickly synthesize organic photothermal eutectic materials with near-infrared absorption, thus avoiding cumbersome and complicated molecular design and synthesis processes, and having a simple production process and being easy to implement.

[0031] The present invention macroscopically transforms microscopic materials through a wet spinning method to produce structurally functional integrated photothermal storage fibers with excellent photothermal properties, providing a new strategy for the research of smart fibers based on organic semiconductors and the preparation of functional fiber fabrics based on organic crystalline materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1Schematic diagram of the route for preparing an organic charge transfer eutectic with near-infrared photothermal properties in Example 1.

[0033] Figure 2 These are the SEM images, one-dimensional growth model images and XRD images of the organic charge transfer eutectic with near-infrared photothermal properties prepared in Example 1; wherein a is the SEM image, b is the one-dimensional growth model image, and c is the XRD image.

[0034] Figure 3 This is the UV-visible-near infrared absorption spectrum of N,N-dimethyl-2-naphthylamine, tetrachlorobenzoquinone and the organic charge transfer co-crystal with near-infrared photothermal properties in Example 1.

[0035] Figure 4 This is a graph showing the photothermal performance test results of the organic charge transfer eutectic with near-infrared photothermal properties prepared in Example 1.

[0036] Figure 5 This is a schematic diagram of preparing a light-heat storage fiber based on an organic charge transfer eutectic with near-infrared photothermal properties in Example 2.

[0037] Figure 6 The actual picture, SEM picture and photothermal performance test result picture of the photothermal storage fiber based on the organic charge transfer eutectic with near-infrared photothermal properties prepared in Example 2; among them, a is the actual picture (upper picture) and SEM picture (lower picture), and b is the photothermal performance test result picture.

[0038] Figure 7 This is a graph showing the photothermal stability test results of the photothermal storage fiber based on the organic charge transfer eutectic with near-infrared photothermal properties prepared in Example 2. DETAILED DESCRIPTION

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0040] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0041] Unless otherwise specified, the experimental methods used in the following examples are all conventional methods, and the materials, reagents, etc. used are all available from commercial sources unless otherwise specified.

[0042] Example 1

[0043] A method for preparing an organic charge transfer eutectic with near-infrared photothermal properties, the schematic diagram of the preparation route is as follows Figure 1 As shown, the specific steps include:

[0044] (1) Using N,N-dimethyl-2-naphthylamine with a π-conjugated molecular structure as an electron donor and tetrachlorobenzoquinone with a benzoquinone structure as an electron acceptor, 5.1 mg of N,N-dimethyl-2-naphthylamine and 7.2 mg of tetrachlorobenzoquinone were added to 10 mL of dichloromethane at a molar ratio of 1:1. Ultrasonic treatment was performed for 10 min to obtain a 3 mmol / L electron donor-acceptor stock solution.

[0045] (2) Add 3 mL of acetonitrile to the electron donor-acceptor stock solution obtained in step (1), let it stand for several days until the solvent is completely evaporated, and obtain an organic charge transfer (NATQ) eutectic with near-infrared photothermal properties.

[0046] Figure 2 The scanning electron microscope (SEM) image, one-dimensional growth model image and X-ray diffraction (XRD) image of the organic charge transfer eutectic with near-infrared photothermal properties prepared in Example 1 are shown in Figure 1; a is the SEM image, b is the one-dimensional growth model image, and c is the XRD image. Figure 2 As can be seen in a, the crystal surface of the organic charge transfer eutectic is smooth, uniform in thickness, and has an average length of about 5 μm. Figure 2 From the growth model diagram in (b), we can see that the crystal grows along the

[020] direction. Figure 2 As can be seen in c, there is a clear difference in the peak shape between the organic charge transfer eutectic material and the electron donor-acceptor material. The organic charge transfer eutectic produces a new diffraction peak, indicating that a new substance has been formed, and the strong peak shape proves that the organic charge transfer eutectic material has high crystallinity.

[0047] Figure 3 is the UV-visible-near infrared absorption spectrum of N,N-dimethyl-2-naphthylamine, tetrachlorobenzoquinone and the organic charge transfer eutectic with near-infrared photothermal properties in Example 1, from Figure 3 It can be seen that through eutectic engineering, the absorption of organic charge transfer eutectics is red-shifted, and the absorption range is 200-1500nm, reaching the second near-infrared region.

[0048] Figure 4 This is a photothermal performance test result of the organic charge transfer eutectic with near-infrared photothermal properties prepared in Example 1. At a power density of 0.137 W / cm 2 Under the irradiation of 808nm laser light, the organic charge transfer eutectic material can heat up from 23℃ to 80℃; in addition, at power densities of 0.062W / cm 2、0.085W / cm 2 and 0.110W / cm 2 Under the irradiation of 808nm laser light, the highest temperatures of the organic charge transfer eutectic materials correspond to 49.5℃, 61.2℃ and 70.3℃ respectively. Figure 4 It is fully confirmed that the organic charge transfer eutectic prepared by the present invention has excellent photothermal properties.

[0049] Example 2

[0050] A method for preparing a light-heat storage fiber based on an organic charge transfer eutectic with near-infrared photothermal properties, the preparation schematic diagram is as follows Figure 5 As shown, the specific steps include:

[0051] S1. Add 0.18 g of the organic charge transfer eutectic with near-infrared photothermal properties prepared in Example 1 to 4.06 mL of dichloromethane, ultrasonicate for several minutes, then add 2.72 mL of N,N-dimethylformamide and 0.60 g of polyurethane, and stir magnetically until completely dissolved to obtain a wet spinning stock solution.

[0052] S2. The wet spinning stock solution obtained in S1 was extruded from an 18G needle at an extrusion speed of 60 mL / h, coagulated in a deionized water coagulation bath at 25°C, with a drawing ratio of 1:1.5, and drawn, collected and wound to obtain a photothermal fiber based on an organic charge transfer eutectic with near-infrared photothermal properties.

[0053] Figure 6 The actual image, SEM image and photothermal performance test result image of the photothermal storage fiber based on the organic charge transfer eutectic with near-infrared photothermal properties prepared in Example 2; among them, a is the actual image (upper image) and SEM image (lower image), and b is the photothermal performance test result image. Figure 6 As can be seen from a, the surface of the light-heat storage fiber prepared by the present invention is smooth and the diameter is about 1 mm; Figure 6 As can be seen in Figure b, under the irradiation of 808nm laser light, when the power density is 0.387W / cm 2 , the temperature of the photothermal storage fiber quickly rose from 22.1°C to 90°C, while under the same conditions, the blank control sample pure polyurethane fiber could only rise from 23.2°C to 24.4°C; this not only shows that the photothermal storage fiber prepared by the present invention has good photothermal properties, but also proves the successful preparation of the photothermal storage fiber based on organic charge transfer eutectic of the present invention.

[0054] Figure 7 This is a test result of the photothermal stability of the photothermal storage fiber based on the organic charge transfer eutectic with near-infrared photothermal properties prepared in Example 2. Under 808nm laser light irradiation, when the power density is 0.387W / cm2 The photothermal storage fiber was subjected to 12 heating-cooling cycle tests, and its highest temperature was stabilized at 90°C, proving that the photothermal storage fiber has excellent photothermal stability.

[0055] Example 3

[0056] A method for preparing an organic charge transfer eutectic with near-infrared photothermal properties comprises the following steps:

[0057] (1) With benzidine as the electron donor and chlorobenzoquinone as the electron acceptor, 5.4 mg of benzidine and 7.2 mg of chlorobenzoquinone were added to 8 mL of dichloromethane and ultrasonicated for 10 min to obtain an electron donor-acceptor stock solution.

[0058] (2) Add 2 mL of acetonitrile to the electron donor-acceptor stock solution obtained in step (1), let it stand for several days until the solvent is completely evaporated, and obtain an organic charge transfer eutectic with near-infrared photothermal properties.

[0059] Example 4

[0060] A method for preparing a light-heat storage fiber based on an organic charge transfer eutectic with near-infrared photothermal properties comprises the following steps:

[0061] S1. Add 0.2 g of the organic charge transfer eutectic with near-infrared photothermal properties prepared in Example 3 to 4.02 mL of dichloromethane, ultrasonicate for several minutes, then add 2.68 mL of N,N-dimethylformamide and 0.60 g of polyurethane, and stir magnetically until completely dissolved to obtain a wet spinning stock solution.

[0062] S2. The wet spinning stock solution obtained in S1 was extruded from an 18G needle at an extrusion speed of 50 mL / h, coagulated in a deionized water coagulation bath at 20°C, with a drawing ratio of 1:1.5, and drawn, collected and wound to obtain a photothermal fiber based on an organic charge transfer eutectic with near-infrared photothermal properties.

[0063] Example 5

[0064] A method for preparing an organic charge transfer eutectic with near-infrared photothermal properties comprises the following steps:

[0065] (1) Using 1-naphthylamine with a π-conjugated molecular structure as an electron donor and tetrafluorobenzoquinone with a benzoquinone structure as an electron acceptor, 4.2 mg of 1-naphthylamine and 5.4 mg of tetrafluorobenzoquinone were added to 8 mL of dichloromethane and ultrasonicated for 10 min to obtain an electron donor-acceptor stock solution.

[0066] (2) Add 3 mL of acetonitrile to the electron donor-acceptor stock solution obtained in step (1), let it stand for several days until the solvent is completely evaporated, and obtain an organic charge transfer eutectic with near-infrared photothermal properties.

[0067] Example 6

[0068] A method for preparing a light-heat storage fiber based on an organic charge transfer eutectic with near-infrared photothermal properties comprises the following steps:

[0069] S1. Add 0.2 g of the organic charge transfer eutectic with near-infrared photothermal properties prepared in Example 3 to 4.02 mL of dichloromethane, ultrasonicate for several minutes, then add 2.72 mL of N,N-dimethylformamide and 0.60 g of polyurethane, and stir magnetically until completely dissolved to obtain a wet spinning stock solution.

[0070] S2. The wet spinning stock solution obtained in S1 was extruded from an 18G needle at an extrusion speed of 70 mL / h, coagulated in an ethanol coagulation bath at 20°C, with a drawing ratio of 1:1.5, and drawn, collected and wound to obtain a photothermal fiber based on an organic charge transfer eutectic with near-infrared photothermal properties.

[0071] Example 7

[0072] A method for preparing an organic charge transfer eutectic with near-infrared photothermal properties comprises the following steps:

[0073] (1) Using N,N-dimethyl-1-naphthylamine with a π-conjugated molecular structure as an electron donor and tetrabromo-1,4-benzoquinone with a benzoquinone structure as an electron acceptor, 5.1 mg of N,N-dimethyl-1-naphthylamine and 12.6 mg of tetrabromo-1,4-benzoquinone were added to 10 mL of dichloromethane and ultrasonicated for 10 min to obtain an electron donor-acceptor stock solution.

[0074] (2) Add 2 mL of acetonitrile to the electron donor-acceptor stock solution obtained in step (1), let it stand for several days until the solvent is completely evaporated, and obtain an organic charge transfer eutectic with near-infrared photothermal properties.

[0075] Example 8

[0076] A method for preparing a light-heat storage fiber based on an organic charge transfer eutectic with near-infrared photothermal properties comprises the following steps:

[0077] S1. Add 0.18 g of the organic charge transfer eutectic with near-infrared photothermal properties prepared in Example 3 to 4.06 mL of dichloromethane, ultrasonicate for several minutes, then add 2.72 mL of N,N-dimethylformamide and 0.60 g of polylactic acid, and stir magnetically until completely dissolved to obtain a wet spinning stock solution.

[0078] S2. The wet spinning stock solution obtained in S1 was extruded from an 18G needle at an extrusion speed of 70 mL / h, coagulated in an ethanol coagulation bath at 25°C, with a drawing ratio of 1:1.5, and drawn, collected and wound to obtain a photothermal fiber based on an organic charge transfer eutectic with near-infrared photothermal properties.

[0079] Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art should understand that other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for preparing an organic charge transfer eutectic with near-infrared photothermal properties, characterized in that: The following steps are involved: (1) using an aniline compound and / or a naphthylamine compound as an electron donor and a benzoquinone compound as an electron acceptor, adding a good organic solvent at a molar ratio of the electron donor to the acceptor molecule of (1-5):(1-5) to obtain an electron donor-acceptor stock solution with a concentration of 0.5-5 mmol / L; (2) adding a poor organic solvent to the electron donor-acceptor stock solution obtained in step (1), and removing the solvent to obtain an organic charge transfer eutectic with near-infrared photothermal properties.

2. The preparation method according to claim 1, characterized in that: In step (1), the electron donor is selected from one or more of aniline, N,N-dimethylaniline, p-aminophenol, o-aminophenol, phenethylamine, diaminobenzene, aminotoluene, 2-bromoaniline, 2-iodoaniline, 3-fluoroaniline, 3-bromoaniline, 3-iodoaniline, 4-fluoroaniline, 4-iodoaniline, diphenylamine, benzidine, 1-naphthylamine, β-naphthylamine, 3-bromo-1-naphthylamine, 5-bromo-2-naphthylamine, N-acetylnaphthylamine, N-ethyl-2-naphthylamine, N,N-dimethyl-2-naphthylamine, N,N-dimethyl-1-naphthylamine, 4-ethyl-1-naphthylamine, 1,1'-dinaphthylamine and 1,2'-dinaphthylamine.

3. The preparation method according to claim 1, characterized in that: In step (1), the electron acceptor is selected from p-benzoquinone, methyl benzoquinone, 2-chloro-1,4-benzoquinone, 2-bromo-1,4-benzoquinone, 2,5-dichloro-1,4-benzoquinone, 2,5-dibromo-1,4-benzoquinone, 2,6-dichloro-p-benzoquinone, 2,6-dibromo-p-benzoquinone, 2,5-dimethyl-1,4-benzoquinone, 2-chloro-5-methyl-1,4-benzoquinone, 2,6-diiodo-p-benzoquinone, 2,6-dimethyl One or more of p-benzoquinone, tetrachlorobenzoquinone, tetrafluorobenzoquinone, o-tetrachlorobenzoquinone, tetrabromo-1,4-benzoquinone, tetramethyl-1,4-benzoquinone, 2,3,5,6-tetra(amino)-p-benzoquinone, tetrahydroxy-1,4-benzoquinone hydrate, 2,3-dichloro-5,6-dicyano-p-benzoquinone, 7,7,8,8-tetracyanobenzoquinodimethane and 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyanodimethyl-p-benzoquinone.

4. The preparation method according to claim 1, characterized in that: In step (1), the good organic solvent is selected from one or more of dichloromethane, chloroform, tetrahydrofuran, acetonitrile and chlorobenzene; in step (2), the poor organic solvent is selected from one or more of ethanol, methanol, isopropanol, acetonitrile, n-hexane and cyclohexane; the volume ratio of the good organic solvent in step (1) to the poor organic solvent in step (2) is (1-10):(1-10).

5. An organic charge transfer eutectic with near-infrared photothermal properties obtained by the preparation method according to any one of claims 1 to 4.

6. A method for preparing a light-heat storage fiber based on an organic charge transfer eutectic with near-infrared photothermal properties, characterized in that: The following steps are involved: S1. dissolving an organic polymer in an organic solvent to obtain an initial spinning stock solution with a concentration of 5-25 g / L; adding the organic charge transfer eutectic with near-infrared photothermal properties as described in claim 5 to the initial spinning stock solution to obtain a wet spinning stock solution; S2. The wet spinning reserve solution obtained in S1 is used for wet spinning, and after passing through a coagulation bath, the light heat storage fiber based on the organic charge transfer eutectic with near-infrared photothermal properties is obtained.

7. The preparation method according to claim 6, characterized in that: In S1, the organic polymer is selected from one or more of polyethylene terephthalate, polylactic acid, polyacrylonitrile, polyurethane, polyether sulfone and polyvinyl alcohol.

8. The preparation method according to claim 6, characterized in that: In S1, the organic solvent is selected from one or more of dichloromethane, tetrahydrofuran, N,N-dimethylformamide, dimethylsulfamide, acetone and toluene.

9. The preparation method according to claim 6, characterized in that: In S2, the coagulation bath is water and / or ethanol.

10. A light-heat storage fiber based on an organic charge transfer eutectic with near-infrared photothermal properties obtained by the preparation method according to any one of claims 6 to 9.

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