Flexible organic dye-dispersed photothermal film and its preparation method

Abstract

This invention provides a method for preparing a flexible organic dye-dispersed photothermal film. The method involves placing a film-forming material in an oven and heating it to dry. The material is then mixed with an organic solvent, stirred until homogeneous, and allowed to stand to remove bubbles, yielding an electrospinning solution. This solution is then used for electrospinning to prepare a nanofiber-based film. An organic photothermal dye, a dispersant, and deionized water are mixed to prepare an organic photothermal dye dispersion. The nanofiber-based film and the organic photothermal dye dispersion are treated through an immersion-pad-drying process to disperse and deposit the organic photothermal dye onto the nanofiber-based film, obtaining an organic photothermal dye deposition film. The organic photothermal dye deposition film is then hot-pressed and washed with water to obtain the flexible organic dye-dispersed photothermal film. This invention also provides a flexible organic dye-dispersed photothermal film. This flexible organic dye-dispersed photothermal film and its preparation method ensure the stability of the photothermal film structure during the cleaning process, particularly the stability between the photothermal material and the polymer porous membrane.

Description

Technical Field

[0001] This invention belongs to the field of polymer membrane separation materials, specifically relating to a flexible organic dye dispersion photothermal film and its preparation method. Background Technology

[0002] Currently, most photothermal membranes are prepared by depositing photothermal materials on the surface of a polymer porous membrane. For example, CN201811288437.4 discloses a porous photothermal membrane with antibacterial properties, which forms a self-floating double-layer porous photothermal membrane by vacuum filtration of a uniformly dispersed CNT aqueous solution onto the surface of a mixed cellulose ester filter membrane; CN201920084758.6 discloses a seawater desalination device using an artificial melanin photothermal membrane, in which the photothermal membrane is a cellulose membrane coated with a melanin material layer on one or both sides. However, due to the presence of concentration polarization, the membrane surface is prone to fouling, which seriously hinders the widespread application of photothermal membrane technology; in addition, the weak interaction between the photothermal material and the porous base membrane also limits the mechanical stability of the photothermal membrane during application. To improve the anti-fouling properties of membrane surfaces, researchers have constructed superwetting surfaces such as superhydrophobic, hydrophilic-hydrophobic composites, and superhydrophobic-superoleophobic surfaces, based on relevant theories of surface science. For example, CN201910804893.8 discloses a porous photothermal membrane with anti-salt precipitation properties, which improves stability and inhibits salt precipitation by hydrophobically modifying the porous membrane. However, hydrophobic or superhydrophobic modification increases processing steps and weakens the structure, reducing the durability of anti-fouling properties and limiting its industrial application. Therefore, regular membrane cleaning remains a necessary step to mitigate the adverse effects of salt precipitation. However, achieving the stability of the photothermal membrane structure during cleaning, especially the stability between the photothermal material and the polymer porous membrane, remains a pressing problem to be solved.

[0003] In summary, a method for preparing a photothermal film that can ensure the stability of the photothermal film structure during the cleaning process, especially the stability between the photothermal material and the polymer porous film, urgently needs to be developed. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a photothermal film that can ensure the stability of the photothermal film structure during the cleaning process, especially the stability between the photothermal material and the polymer porous film.

[0005] To achieve the above and other related objectives, the present invention provides a method for preparing a flexible organic dye-dispersed photothermal film, comprising the following steps:

[0006] Step 1, Preparation of nanofiber base film: The film-forming material is placed in an oven and heated to dry. It is then mixed with an organic solvent, stirred evenly, and allowed to stand to remove bubbles, resulting in a uniform electrospinning solution. The electrospinning solution is then used to prepare nanofiber base film by electrospinning.

[0007] Step 2, Preparation of organic photothermal dye deposition film: Mix organic photothermal dye, dispersant and deionized water to prepare a uniform organic photothermal dye dispersion. Process the nanofiber base film and the organic photothermal dye dispersion through an immersion-rolling-drying process to disperse and deposit the organic photothermal dye in the nanofiber base film to obtain an organic photothermal dye deposition film.

[0008] Step 3, Hot-pressing treatment: The organic photothermal dye deposited film is hot-pressed to improve its integrity and promote the migration of the organic photothermal dye into the fiber interior. A water washing process is then used to remove loosely adhered organic photothermal dye, resulting in the flexible organic dye-dispersed photothermal film. The impregnation-pad-drying process includes...

[0009] 1) Impregnation: Under room temperature conditions, the nanofiber base film is immersed in an organic photothermal dye dispersion;

[0010] 2) Roller extrusion: The nanofiber base film impregnated with organic photothermal dye dispersion is placed between the rollers of a rolling mill and mechanically extruded to remove excess organic photothermal dye dispersion.

[0011] 3) Drying: Dry the nanofiber base film after it is extruded by the rollers to obtain an organic photothermal dye deposition film with organic photothermal dye deposited on it.

[0012] Preferably, it includes the following steps:

[0013] Step 1, Preparation of nanofiber base film: The film-forming material is placed in an oven and heated to dry. It is then mixed with an organic solvent, stirred evenly, and allowed to stand to remove bubbles, resulting in a uniform electrospinning solution. The electrospinning solution is then used to prepare nanofiber base film by electrospinning.

[0014] Step 2, Preparation of organic photothermal dye deposition film: Mix organic photothermal dye, dispersant and deionized water to prepare a uniform organic photothermal dye dispersion. Process the nanofiber base film and the organic photothermal dye dispersion through an immersion-rolling-drying process to disperse and deposit the organic photothermal dye in the nanofiber base film to obtain an organic photothermal dye deposition film.

[0015] Step 3, Hot-pressing treatment: The organic photothermal dye deposited film is hot-pressed to improve its integrity and promote the migration of the organic photothermal dye into the fiber interior. A water washing process is then used to remove loosely adhered organic photothermal dye, resulting in the flexible organic dye-dispersed photothermal film. The impregnation-pad-drying process includes...

[0016] 1) Impregnation: Under room temperature conditions, the nanofiber base membrane is immersed in an organic photothermal dye dispersion for 30-60 min; the weight ratio of the nanofiber base membrane to the organic photothermal dye dispersion is 1.0:10.0-40.0;

[0017] 2) Roller extrusion: The nanofiber-based membrane impregnated with the organic photothermal dye dispersion is placed between the rollers of a rolling mill and mechanically extruded to remove excess organic photothermal dye dispersion. The weight ratio of the extruded nanofiber membrane to the organic photothermal dye dispersion is controlled to be 1.0:0.2-0.5.

[0018] 3) Drying: The nanofiber base film after being extruded by the rollers is dried at 60-80℃ to obtain an organic photothermal dye deposition film with organic photothermal dye deposited on it.

[0019] Preferably, the method includes the following steps: In step 1, the film-forming material is one or more of polysulfone, polyethersulfone, cellulose acetate, and polyacrylonitrile; the organic solvent is one or more of N,N-dimethylacetamide, N,N-dimethylformamide, dimethyl sulfoxide, N-methylpyrrolidone, acetone, and glacial acetic acid.

[0020] Preferably, the weight ratio of the film-forming material to the organic solvent is 1.0:4.0 to 12.0.

[0021] Preferably, in step 2, the organic photothermal dye is one or more of organic disperse black, disperse brilliant blue, disperse yellow, disperse orange, and disperse red; the dispersant is one or more of dispersant O-20, dispersant O-50, dispersant O-80, dispersant NNO (sodium methylene bisnaphthalene sulfonate), and ethylene bisstearamide.

[0022] Preferably, the weight ratio of the organic photothermal dye, dispersant and deionized water is 0.5-5.0:0.1-1.0:100.0.

[0023] Preferably, in step 3, the hot pressing temperature is 110–150°C, and the time is 1–5 hours.

[0024] Preferably, the washing process includes two steps: hot water washing and cold water washing. The hot water washing temperature is 60-80℃, and the cold water washing temperature is 20-30℃.

[0025] A flexible organic dye dispersed photothermal film, characterized in that the flexible organic dye dispersed photothermal film is prepared by the above-mentioned method.

[0026] Preferably, it includes the nanofiber base film and organic photothermal dyes dispersed on the surface and inside the nanofiber base film.

[0027] The preparation method of the flexible organic dye-dispersed photothermal film presented in this case has the following beneficial effects:

[0028] 1) This invention uses inexpensive organic photothermal dyes as photothermal materials and combines them with hot pressing to prepare flexible organic dye-dispersed photothermal films. The preparation process is simple and practical and easy to industrialize.

[0029] 2) The organic disperse dyes in this invention have good compatibility and are easy to match, and they are small in size and have strong migration ability. During the hot pressing process, due to the increase in temperature, the movement of polymer molecular chain segments intensifies, and the resulting instantaneous pores provide conditions for the migration of small disperse dye molecules, thereby promoting their entry into the interior of the nanofibers; after cooling, the polymer chain segments are frozen, which also fixes the small disperse dye molecules inside the nanofibers.

[0030] 3) While imparting photothermal properties to the polymer membrane, the present invention maintains its flexibility and can be repeatedly washed and recycled, thereby greatly extending the membrane life.

[0031] 4) It can use inexhaustible solar energy as a driving force and seawater as a water source to obtain valuable freshwater resources, which greatly reduces the energy consumption and cost of the desalination process. Attached Figure Description

[0032] Figure 1 The image shows the appearance of the flexible organic dye-dispersed photothermal film prepared in Example 1.

[0033] Figure 2 Electron microscopy image of the surface of the flexible organic dye-dispersed photothermal film prepared in Example 1;

[0034] Figure 3 The image shows the water contact angle test results of the flexible organic dye dispersed photothermal film prepared in Example 1.

[0035] Figure 4 The image shows the flexible organic dye dispersion photothermal film prepared in Example 1 under illumination.

[0036] Figure 5 The graph shows the water flux and rejection rate of the flexible organic dye-dispersed photothermal film prepared in Example 1 as a function of time.

[0037] Figure 6 This is a schematic diagram of the photothermal film distillation device obtained by the present invention;

[0038] Among them, 1-permeation chamber; 2-feed chamber; 3-coagulation chamber; 4-flexible organic dye dispersion photothermal film; 5-feed liquid; 6-simulated fluorescent lamp; 7-conductivity meter; 8-online monitoring system; 9-electronic balance. Detailed Implementation

[0039] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0040] The anti-fouling distillation membrane obtained in the examples was tested and evaluated for the following technical indicators.

[0041] (1) Contact angle test: The prepared flexible organic dye dispersed photothermal film was fixed on a glass slide and placed on a contact angle measuring instrument for testing. 5 μL of deionized water was added, and 5 different test points were taken for each sample. The average value was taken as the final contact angle of the sample.

[0042] (2) Permeation and separation performance: The photothermal film distillation device prepared by this invention is as follows: Figure 5 The photothermal film 4 prepared in this invention is located between the permeation chamber 1 and the feed chamber 2, with seawater (salt content approximately 3.5%) as the feed liquid 5 fed into the feed chamber 2. A simulated fluorescent lamp 6 (light power density 1.0 KW / m²) is used. 2 Under irradiation, the photothermal membrane of this invention converts light energy into heat energy to drive the evaporation of the feed liquid 5. The generated water vapor passes through the membrane pores and the permeation chamber 1, and enters the condensation chamber 3. The condensate quality is weighed by an electronic balance 9 and recorded by an online monitoring system 8. The condensate conductivity is measured by a conductivity meter 7. The photothermal membrane permeation flux is characterized by the change in condensate quality, i.e., the increase in pure water per unit time and per unit membrane area; the salt rejection rate is characterized by the changes in the conductivity of the feed liquid and the condensate.

[0043] (3) Operational stability test: Using seawater as feed liquid, the solar driven membrane (the photothermal membrane prepared in this invention) distillation device was continuously concentrated and operated. The photothermal membrane was cleaned once every 72 hours to evaluate the changes in the permeation flux and rejection rate of the photothermal membrane.

[0044] Unless otherwise specified, all reagents used in the following examples of the present invention are of analytical grade and were purchased from China National Pharmaceutical Group Shanghai Chemical Reagent Co., Ltd.

[0045] Example 1:

[0046] This invention provides a method for preparing a flexible organic dye-dispersed photothermal film, comprising the following steps:

[0047] 1. Preparation of nanofiber-based membrane: Polyacrylonitrile powder was treated in an oven at 60℃ for 24h. One part of polyacrylonitrile and nine parts of N,N-dimethylformamide were mixed and mechanically stirred at 60℃ for 12h, and then allowed to stand at 60℃ for 12h to remove bubbles, resulting in a homogeneous electrospinning solution. Nanofiber-based membranes were prepared by electrospinning. The electrospinning process conditions were: voltage 20KV, distance between needle and receiving roller 18cm, spinning time 15h, injection speed 0.9mL / h, spinning temperature 25±1℃, and spinning humidity 60±3%.

[0048] 2. Preparation of organic photothermal dye deposition film: 3 parts of disperse black, 0.6 parts of sodium methylene bis(naphthalene) sulfonate and 100 parts of deionized water were mixed and ultrasonically treated for 30 min to prepare a uniform photothermal material dispersion; 1 part of the nanofiber base film was immersed in 30 parts of the above dispersion at room temperature for 45 min, and then placed between the rollers of a rolling mill and mechanically squeezed to remove excess dispersion. The weight ratio of the squeezed nanofiber film to the photothermal material dispersion was controlled to be 1.0:0.3. Finally, it was dried in an oven at 70℃ to obtain an organic photothermal dye deposition film with organic photothermal dye deposited on it.

[0049] 3. Hot-pressing treatment: The organic photothermal dye deposited film is hot-pressed at 120℃ for 2 hours to improve its integrity and promote the migration of photothermal materials into the fiber interior. It is then washed with hot water at 70℃ and cold water at 25℃ to remove loosely adhered photothermal materials, resulting in the flexible organic dye-dispersed photothermal film. The appearance of the prepared flexible organic dye-dispersed photothermal film is shown in the figure below. Figure 1 As shown, the surface electron microscope image is as follows. Figure 2 As shown.

[0050] Testing showed that the water contact angle on the surface of the flexible organic dye-dispersed photothermal film prepared in this embodiment was 62.5°. Figure 3 Under light conditions, the surface temperature reaches as high as 54.4℃. Figure 4 The treatment effect on seawater is as follows: water flux is 1.43 Lm. -2 h -1 With a retention rate of 99.99%, after 72 hours of continuous concentration operation, the water flux gradually decreased, but its performance could be restored by rinsing with deionized water. Figure 5 Compared with ordinary polyacrylonitrile nanofiber membranes (which have no photothermal properties), the water flux and operational stability are significantly improved.

[0051] Example 2:

[0052] This invention provides a method for preparing a flexible organic dye-dispersed photothermal film, comprising the following steps:

[0053] 1. Preparation of nanofiber-based membrane: The steps are the same as step 1 in Example 1.

[0054] 2. Preparation of organic photothermal dye deposition film: 1 part disperse brilliant blue, 1 part disperse yellow, 1 part disperse red, 0.5 part Pingpingjia O-50 and 100 parts deionized water were mixed and ultrasonically treated for 30 min to prepare a uniform photothermal material dispersion; 1 part of the nanofiber base film was immersed in 30 parts of the above dispersion at room temperature for 45 min, and then placed between the rollers of a rolling mill and mechanically squeezed to remove excess dispersion. The weight ratio of the squeezed nanofiber film to the photothermal material dispersion was controlled to be 1.0:0.4. Finally, it was dried in an oven at 70℃ to obtain an organic photothermal dye deposition film with organic photothermal dye deposited on it.

[0055] 3. Hot pressing treatment: The organic photothermal dye deposited film is hot-pressed at 120°C for 3 hours to improve its integrity and promote the migration of photothermal materials into the fiber interior. After washing with hot water at 70°C and cold water at 25°C to remove the photothermal materials that are not firmly attached to the surface, the flexible organic dye dispersed photothermal film is obtained.

[0056] Testing showed that the flexible organic dye-dispersed photothermal film prepared in this embodiment had a water contact angle of 61.3° and a surface temperature as high as 53.4°C under illumination. Its seawater treatment effect was a water flux of 1.41 Lm. -2 h -1 With a rejection rate of 99.99%, the water flux gradually decreased after 72 hours of continuous concentration operation, but its performance could be restored by washing with deionized water. Compared with ordinary polyacrylonitrile nanofiber membranes (without photothermal properties), the water flux and operational stability were significantly improved.

[0057] Example 3:

[0058] This invention provides a method for preparing a flexible organic dye-dispersed photothermal film, comprising the following steps:

[0059] 1. Preparation of nanofiber-based membrane: Polyethersulfone powder was treated in an oven at 60℃ for 24h. One part of polyethersulfone and eight parts of N,N-dimethylformamide were mixed and mechanically stirred at 60℃ for 12h, and then allowed to stand at 60℃ for 12h to remove bubbles, resulting in a homogeneous electrospinning solution. Nanofiber-based membranes were prepared by electrospinning. The electrospinning process conditions were: voltage 17KV, distance between needle and receiving roller 15cm, spinning time 12h, injection speed 0.7mL / h, spinning temperature 25±1℃, and spinning humidity 60±3%.

[0060] 2. Preparation of organic photothermal dye deposition film: The steps are the same as step 2 in Example 1.

[0061] 3. Hot pressing treatment: The organic photothermal dye deposited film is hot-pressed at 120°C for 3 hours to improve its integrity and promote the migration of photothermal materials into the fiber interior. After washing with hot water at 70°C and cold water at 25°C to remove the photothermal materials that are not firmly attached to the surface, the flexible organic dye dispersed photothermal film is obtained.

[0062] Testing showed that the flexible organic dye-dispersed photothermal film prepared in this embodiment had a water contact angle of 61.8° and a surface temperature as high as 55.0°C under illumination. Its seawater treatment effect was a water flux of 1.42 Lm. -2 h -1 With a rejection rate of 99.99%, the water flux gradually decreased after 72 hours of continuous concentration operation, but its performance could be restored by washing with deionized water. Compared with ordinary polyethersulfone nanofiber membranes (without photothermal properties), the water flux and operational stability were significantly improved.

[0063] Example 4:

[0064] This invention provides a method for preparing a flexible organic dye-dispersed photothermal film, comprising the following steps:

[0065] 1. Preparation of nanofiber membrane: The steps are the same as step 1 in Example 3.

[0066] 2. Preparation of photothermal material deposition film: The steps are the same as step 2 in Example 2.

[0067] 3. Hot pressing treatment: The steps are the same as step 3 in Example 3.

[0068] Testing showed that the flexible organic dye-dispersed photothermal film prepared in this embodiment had a water contact angle of 61.3° and a surface temperature as high as 54.4°C under illumination. Its seawater treatment effect was a water flux of 1.40 Lm. -2 h -1 With a rejection rate of 99.99%, the water flux gradually decreased after 72 hours of continuous concentration operation, but its performance could be restored by washing with deionized water. Compared with ordinary polyethersulfone nanofiber membranes (without photothermal properties), the water flux and operational stability were significantly improved.

[0069] Example 5:

[0070] This invention provides a method for preparing a flexible organic dye-dispersed photothermal film, comprising the following steps:

[0071] 1. Preparation of nanofiber-based membrane: Cellulose acetate was treated in an oven at 60℃ for 24 h. 1 part polyethersulfone, 1.5 parts N,N-dimethylacetamide, and 3.5 parts acetone were mixed and mechanically stirred at 60℃ for 12 h, followed by standing at 60℃ for degassing for 12 h to obtain a homogeneous electrospinning solution. Nanofiber-based membranes were prepared by electrospinning. The electrospinning process conditions were: voltage 15 kV, distance between the needle and the receiving roller 15 cm, spinning time 20 h, injection speed 0.5 mL / h, spinning temperature 25 ± 1℃, and spinning humidity 60 ± 3%.

[0072] 2. Preparation of organic photothermal dye deposition film: The steps are the same as step 2 in Example 1;

[0073] 3. Hot pressing treatment: The organic photothermal dye deposited film is hot-pressed at 130°C for 2 hours to improve its integrity and promote the migration of photothermal materials into the fiber interior. After washing with hot water at 70°C and cold water at 25°C to remove the photothermal materials that are not firmly attached to the surface, the flexible organic dye dispersed photothermal film is obtained.

[0074] Testing showed that the flexible organic dye-dispersed photothermal film prepared in this embodiment had a water contact angle of 59.9° and a surface temperature as high as 55.5°C under illumination. Its seawater treatment effect was a water flux of 1.46 Lm. -2 h -1 With a retention rate of 99.99%, the water flux gradually decreased after 72 hours of continuous concentration operation, but its performance could be restored by washing with deionized water. Compared with ordinary cellulose acetate nanofiber membranes (without photothermal properties), the water flux and operational stability were significantly improved.

[0075] Example 6:

[0076] This invention provides a method for preparing a flexible organic dye-dispersed photothermal film, comprising the following steps:

[0077] 1. Preparation of nanofiber-based membrane: The steps are the same as step 1 in Example 5;

[0078] 2. Preparation of organic photothermal dye deposition film: The steps are the same as step 2 in Example 2;

[0079] 3. Hot pressing treatment: The steps are the same as step 3 in Example 5;

[0080] Testing showed that the flexible organic dye-dispersed photothermal film prepared in this embodiment had a water contact angle of 60.3° and a surface temperature as high as 55.2°C under illumination. Its seawater treatment effect was a water flux of 1.44 Lm. -2 h -1With a rejection rate of 99.99%, the water flux gradually decreased after 72 hours of continuous concentration operation, but its performance could be restored by washing with deionized water. Compared with ordinary cellulose acetate nanofiber membranes (without photothermal properties), the water flux and operational stability were significantly improved.

[0081] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for preparing a flexible organic dye-dispersed pyroelectric film, characterized by, The method comprises the following steps: Step 1, preparation of nanofiber-based film: the film-forming material is heated and dried in an oven, mixed with an organic solvent, stirred uniformly and left to deaerate to obtain a uniform electrospinning solution, and the electrospinning solution is used to prepare a nanofiber-based film by electrospinning; Step 2, preparation of organic photothermal dye deposition film: the organic photothermal dye, dispersant and deionized water are mixed to prepare a uniform organic photothermal dye dispersion liquid, and the nanofiber-based film and the organic photothermal dye dispersion liquid are treated by an immersion-pad-drying process to deposit the organic photothermal dye in the nanofiber-based film to obtain the organic photothermal dye deposition film; Step 3, heat pressing treatment: the organic photothermal dye deposition film is heat pressed to improve its integrity and promote the migration of the organic photothermal dye to the inside of the fibers, and a water washing process is used to remove the organic photothermal dye that is not firmly attached to the surface to obtain the flexible organic dye dispersion photothermal film; wherein the immersion-pad-drying process comprises, 1) immersion: the nanofiber-based film is immersed in the organic photothermal dye dispersion liquid at room temperature; 2) roller extrusion: the nanofiber-based film immersed in the organic photothermal dye dispersion liquid is placed between the rollers of a pad machine, mechanically extruded to remove excess organic photothermal dye dispersion liquid; 3) drying: the nanofiber-based film after roller extrusion is dried to obtain the organic photothermal dye deposition film in which the organic photothermal dye is deposited.

2. The method for preparing the flexible organic dye-dispersed photothermal film according to claim 1, characterized in that, The immersion-pad-drying process in Step 3 comprises, 1) immersion: the nanofiber-based film is immersed in the organic photothermal dye dispersion liquid for 30-60 min at room temperature; the weight ratio of the nanofiber-based film to the organic photothermal dye dispersion liquid is 1.0:10.0-40.0; 2) roller extrusion: the nanofiber-based film immersed in the organic photothermal dye dispersion liquid is placed between the rollers of a pad machine, mechanically extruded to remove excess organic photothermal dye dispersion liquid, and the weight ratio of the nanofiber-based film to the organic photothermal dye dispersion liquid after extrusion is controlled to be 1.0:0.2-0.5; 3) drying: the nanofiber-based film after roller extrusion is dried at 60-80°C to obtain the organic photothermal dye deposition film in which the organic photothermal dye is deposited.

3. The method of claim 1 or 2, wherein the flexible organic dye-dispersed photothermal film is prepared by the steps of: The method comprises the following steps: In Step 1, the film-forming material is one or more of polysulfone, polyethersulfone, cellulose acetate and polyacrylonitrile; and the organic solvent is one or more of N,N-dimethylacetamide, N,N-dimethylformamide, dimethyl sulfoxide, N-methyl pyrrolidone, acetone and glacial acetic acid.

4. The method for preparing the flexible organic dye-dispersed photothermal film according to claim 3, characterized in that, The weight ratio of the film-forming material to the organic solvent is 1.0:4.0-12.

0.

5. The method of claim 1, 2, or 4, wherein the flexible organic dye dispersed photothermal film is prepared by the steps of: In Step 2, the organic photothermal dye is one or more of organic disperse black, disperse brilliant blue, disperse yellow, disperse orange and disperse red; and the dispersant is one or more of Pergipal O-20, Pergipal O-50, Pergipal O-80, dispersant NNO (sodium methylene bisnaphthalene sulfonate) and ethylene bis-stearamide.

6. The method for preparing the flexible organic dye-dispersed photothermal film according to claim 5, characterized in that, The weight ratio of the organic photothermal dye, the dispersant and deionized water is 0.5-5.0:0.1-1.0:100.

0.

7. The method of claim 1, 2, 4, or 6, wherein the flexible organic dye dispersed photothermal film is prepared by the steps of: In Step 3, the heat pressing temperature is 110-150°C, and the time is 1-5 h.

8. The method for preparing the flexible organic dye-dispersed photothermal film according to claim 5, characterized in that, The water washing process includes two processes of hot water washing and cold water washing, the temperature of hot water washing is 60-80 DEG C, and the temperature of cold water washing is 20-30 DEG C.

9. A flexible organic dye-dispersed pyroelectric film, characterized by, The flexible organic dye dispersion photothermal film is prepared by the preparation method in any of claims 1-8.

10. The flexible organic dye-dispersed photothermal film of claim 9, wherein, The nanofiber-based film and the organic photothermal dye dispersed on the surface and inside of the nanofiber-based film.

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