Modified polyaryletherketone as well as preparation method and application thereof

Abstract

The invention relates to the technical field of polyaryletherketone, and discloses modified polyaryletherketone as well as a preparation method and application thereof, the structural formula of the modified polyaryletherketone is shown in the specification, the value range of n is 1-40% (m + n), and the value range of m is 60-99% (m + n). The preparation method comprises the following steps: in a nitrogen atmosphere, mixing decafluorobiphenyl ketone, 4-4 '-difluorobenzophenone and biphenol, adding anhydrous carbonate, an aprotic polar solvent and a water-carrying agent, and carrying out temperature programming reaction at 140-200 DEG C to obtain the modified polyaryletherketone, wherein the molar ratio of the sum of decafluorobiphenyl ketone and 4-4 '-difluorobenzophenone to biphenol to carbonate of anhydrous alkali metal is 1: (1-1.1): (1-1.3), the modified polyaryletherketone is used for preparing radiation cooling materials, and # imgabs0 # is used for preparing radiation cooling materials.

Description

Technical Field

[0001] The invention belongs to the technical field of polyaryletherketone, and in particular relates to a modified polyaryletherketone and a preparation method and application thereof. Background Art

[0002] High-performance polymers refer to polymers that contain a large number of aromatic rings in their molecular chains, which make the polymers exhibit excellent properties in thermal stability, chemical stability, mechanical properties, and corrosion resistance, making such polymers widely used in aviation, automobiles, electronics, chemicals, and other fields. Among them, polyaryletherketone, as a high-performance polymer, has excellent high temperature resistance, mechanical properties, electrical insulation, and good processability, and plays an important role in many fields. However, the comprehensive performance of the existing common polyetheretherketone is not good, and it can only be used in some low-end fields such as compressor parts. Therefore, it is necessary to develop and prepare polyetheretherketone with excellent comprehensive performance.

[0003] The prior art discloses the research on the synthesis of polyetheretherketone (PEEK), and it is analyzed that the reason why the comprehensive performance of some polyetheretherketones is not good is that the key technologies such as the synthesis process equipment and process parameters have not been well solved. For example, in the electrophilic synthesis route, there are side reactions such as polymer branching and cross-linking; in the nucleophilic synthesis route, the reaction conditions are harsh, the synthesis process is complicated, the monomers are expensive, and the cost is high. To this end, Ren Wenqing developed a method for preparing polyetheretherketone, which adopts a nucleophilic substitution route, specifically using 4,4'-difluorobenzophenone and hydroquinone, in the presence of alkali metal carbonate, using diphenyl sulfone as a solvent for condensation reaction, to obtain polyetheretherketone with good tensile strength, elastic modulus and impact resistance.

[0004] However, the polyetheretherketone prepared by the preparation method has poor heat resistance, and there are few reports in the prior art on polyetheretherketone as a radiation cooling material. Summary of the invention

[0005] The present invention provides a modified polyaryletherketone and a preparation method and application thereof, which solve the problems that the polyetheretherketone prepared in the prior art has poor heat resistance and does not contain a group with selective emission in its structure, resulting in poor radiation cooling performance.

[0006] The first aspect of the present invention provides a modified polyaryletherketone, the structural formula of which is:

[0007]

[0008] The value range of n is 1 to 40% (m+n), and the value range of m is 60 to 99% (m+n).

[0009] The second object of the present invention is to protect the preparation method of the modified polyaryletherketone, comprising:

[0010] In a nitrogen atmosphere, decafluorobiphenyl ketone, 4-4'-difluorobenzophenone and biphenyl diphenol are mixed, and then anhydrous carbonate, aprotic polar solvent and a water-carrying agent are added, and a programmed temperature reaction is carried out at 140-200° C. to obtain the modified polyaryletherketone; wherein the molar ratio of the sum of decafluorobiphenyl ketone, 4-4'-difluorobenzophenone, biphenyl diphenol and anhydrous alkali metal carbonate is 1:(1-1.1):(1-1.3).

[0011] Preferably, the molar ratio of decafluorobiphenyl ketone to 4-4'-difluorobenzophenone is (0.2-0.8):(0.8-0.2).

[0012] Preferably, the reaction conditions are specifically:

[0013] First increase the temperature to 140-150°C and keep it constant for 2-3 hours; continue to increase the temperature to 165-175°C and keep it constant for 1-2 hours; then increase the temperature to 190-200°C and keep it constant for 3-4 hours.

[0014] First, the temperature is raised to 140-150°C to azeotropically form salt and remove water from the system, then the temperature is raised to 165-175°C to remove the water-carrying agent, and then the temperature is raised to 190-200°C to continue the reaction.

[0015] Preferably, the anhydrous carbonate includes one or two of anhydrous sodium carbonate, anhydrous potassium carbonate and anhydrous cesium carbonate.

[0016] Preferably, the water-carrying agent is one or both of toluene and acetone.

[0017] Preferably, the aprotic polar solvent is sulfolane.

[0018] The third object of the present invention is to protect the use of the modified polyaryletherketone in the preparation of radiation cooling materials.

[0019] The fourth object of the present invention is to protect the radiation cooling material, comprising the modified polyaryletherketone.

[0020] A fifth object of the present invention is to protect a method for preparing the radiation cooling material, comprising:

[0021] The modified polyaryletherketone is formed by extrusion and molding to obtain the radiation cooling material.

[0022] Preferably, the extruded particles are dried at 100-120° C. for 12-14 hours and then molded.

[0023] Preferably, the molding process is performed under the conditions of a temperature of 190 to 220° C. and a pressure of 15 to 20 MPa.

[0024] Preferably, the radiation cooling material is obtained by cooling, ultrasonication and vacuum drying after molding.

[0025] Preferably, cooling in deionized water for 5 to 10 minutes; ultrasonication for 20 to 30 minutes, ultrasonication for 3 to 5 times; and vacuum drying at 50 to 60° C. for 1 to 2 hours.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The modified polyaryletherketone molecular structure provided by the present invention contains a CF bond with a higher bond energy, which not only makes internal rotation difficult, but also limits the interaction force between macromolecules. More importantly, the fluorine atom forms a CF bond with the carbon atom on the benzene ring, obtaining a p-π conjugation that is stronger than the σ-p conjugation, thereby giving the modified polyaryletherketone a higher thermal stability and chemical stability; at the same time, the fluorine atom contained is conducive to the formation of intermolecular hydrogen bonds, enhancing the intermolecular force of the modified polyaryletherketone, so that the modified polyaryletherketone has better mechanical properties; in addition, since fluorine has Strong electronegativity, the modified polyaryletherketone can effectively absorb ultraviolet rays and ionizing radiation, effectively change the aggregated structure of macromolecules, and have better aging resistance; secondly, there are a large number of CH bonds, COC bonds and CF bonds in the molecular chain of the modified polyaryletherketone, which stretch and bend in the infrared region (6.7-16.7 μm) of the infrared spectrum, and overlap with the atmospheric window (8-13 μm), so that the emissivity of the modified polyaryletherketone in the atmospheric window increases; at the same time, the modified polyaryletherketone has a higher reflectivity in the sunlight band, which can reduce the absorption of sunlight. It has good emissivity in the atmospheric window and good reflectivity in the sunlight band, so that the modified polyaryletherketone can realize the functional application of radiation refrigeration and reduce the consumption of non-renewable energy. Therefore, the modified polyaryletherketone provided by the present invention exhibits excellent thermal stability, chemical stability, mechanical properties, aging resistance, and ultraviolet radiation resistance, and can be widely used in aviation, military, and automotive fields.

[0028] 2. The preparation method of the modified polyaryletherketone provided by the present invention has cheap raw materials, simple process and good comprehensive performance of the synthesized product. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A synthetic route diagram of the modified polyaryletherketone provided by the present invention;

[0030] Figure 2 This is an infrared absorption spectrum of the modified polyaryletherketone provided in Example 1 of the present invention;

[0031] Figure 3 The ultraviolet absorption spectrum of the modified polyaryletherketone provided in Example 1 of the present invention;

[0032] Figure 4 The synthesis process of polyetheretherketone provided in Comparative Example 1;

[0033] Figure 5 This is the reflectivity spectrum of the modified polyaryletherketone provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0034] The technical solutions in the present invention will be described clearly and completely below in conjunction with the specific implementation of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0035] The methods described in the embodiments of the present invention are conventional methods unless otherwise specified. The materials, reagents, etc. used can be obtained from commercial sources unless otherwise specified.

[0036] In the following description of this embodiment, the term "and / or" is used to describe the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, B exists alone, and A and B exist at the same time. Among them, A and B can be singular or plural; the single symbol " / " means "or".

[0037] In the following description of this embodiment, the term "at least one" refers to one or more, and "plurality" refers to two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, "at least one of A, B or C", or "at least one of A, B and C" can represent any one of A, B, C, or A+B, or A+C, or B+C, or A+B+C, where A, B, C can be single or multiple, respectively.

[0038] In the following description of this embodiment, the order of serial numbers does not mean the order of execution. Some or all of the steps can be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of this embodiment.

[0039] In the following description of the present embodiment, the numerical range should be understood to also specifically disclose each intermediate value between the upper and lower limits of the range. Any stated value or intermediate value in the stated range and any other stated value or each smaller range between the intermediate values ​​in the stated range are also included in the present embodiment, and the upper and lower limits of the smaller range can be independently included or excluded in the range.

[0040] Unless otherwise stated, the technical / scientific terms used in the present embodiment have the same meanings as those generally understood by those skilled in the art to which the present application belongs. Although the present application only describes preferred methods and materials, any similar or equivalent methods and materials may also be used in the implementation or testing of the present application. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In the event of any conflict with any incorporated document, the content of this specification shall prevail.

[0041] The synthetic route of the modified polyaryletherketone in the embodiment of the present invention is shown in Figure 1 .

[0042] Example 1

[0043] This embodiment provides a modified polyaryletherketone, the structural formula of which is:

[0044]

[0045] Among them, n=80%, m=20%.

[0046] The preparation method of the modified polyaryletherketone comprises:

[0047] At a nitrogen rate of 70 ml / min, 0.02 mol of decafluorobiphenyl ketone, 0.08 mol of 4-4'-difluorobenzophenone, and 0.1 mol of biphenyl diphenol were added in sequence into a container equipped with a mechanical stirrer, a thermometer, a condenser, and a Dean-Stark water separator, followed by 0.12 mol of anhydrous cesium carbonate as a catalyst, 15 ml of cyclopentane sulfone as a solvent, and 10 ml of toluene as a water-carrying agent. The system temperature is raised to 140°C for azeotropic salt formation and maintained at the constant temperature for 3 hours to remove moisture from the system; the temperature is further raised to 165°C and maintained at the constant temperature for 1 hour to remove toluene; the temperature is then raised to 190°C and maintained at the constant temperature for 4 hours, the product is collected and poured into deionized water for cooling treatment, and then the product is crushed and washed with deionized water and ethanol for 6 times to remove cyclopentane sulfone and inorganic salts, filtered, and dried in a 70°C forced air drying oven for 8 hours, and then placed in a 65°C vacuum drying oven for 20 hours to obtain a white fluorinated polyaryletherketone, i.e., the modified polyaryletherketone.

[0048] A method for preparing a radiation cooling material, comprising:

[0049] The particles were extruded using a twin-screw extruder of specification ZSK25, and dried at 100°C for 14 hours. Then, the particles were placed in a mold of 100×100×0.6 mm, and compression molded at a temperature of 200°C and a pressure of 16 MPa. After compression molding, the particles were placed in deionized water to cool for 5 minutes, and then placed in a beaker containing toluene. The beaker was placed in an ultrasonic cleaner, ultrasonicated 3 times, each time for 30 minutes, and then placed in a 50°C vacuum drying oven, and dried at a constant temperature for 2 hours to obtain a fluorinated polyaryletherketone film, i.e., the radiation cooling material.

[0050] Example 2

[0051] A modified polyaryletherketone, the structural formula of which is:

[0052]

[0053] Among them, n=60%, m=40%.

[0054] The preparation method of the modified polyaryletherketone comprises:

[0055] At a nitrogen rate of 65 ml / min, 0.04 mol of decafluorobiphenyl ketone, 0.06 mol of 4-4'-difluorobenzophenone, and 0.1 mol of biphenyl diphenol were added in sequence to a container equipped with a mechanical stirrer, a thermometer, a condenser, and a Dean-Stark water separator, followed by 0.12 mol of anhydrous cesium carbonate as a catalyst, 15 ml of cyclopentane as a solvent, and 10 ml of toluene as a water-carrying agent. The system was heated to 150°C for azeotropic salt formation and kept at this temperature for 2 hours to remove the water in the system; the temperature was further raised to 170°C and kept at this temperature for 1.5 hours to remove toluene; the temperature was then raised to 195°C and kept at this temperature for 3.5 hours. After the high-temperature polymerization reaction, the product was collected and poured into deionized water for cooling treatment, and then the product was crushed and washed with deionized water and ethanol 7 times to remove cyclopentane and inorganic salts, and then filtered. The mixture was placed in a 70°C forced air drying oven and dried at a constant temperature for 8 h. It was then placed in a 60°C vacuum drying oven and dried at a constant temperature for 24 h to obtain a white fluorinated polyaryletherketone.

[0056] The particles were extruded using a twin-screw extruder of ZSK25 type and dried at 120°C for 12 hours. They were then placed in a 120mm×120mm×1mm mold and compression molded at a temperature of 220°C and a pressure of 20MPa. After compression molding, the fluorinated polyaryletherketone film was placed in deionized water to cool for 8 minutes and then placed in a beaker containing cyclohexane. The beaker containing cyclohexane and the fluorinated polyaryletherketone film was placed in an ultrasonic cleaner and ultrasonicated 5 times, each time for 20 minutes. The fluorinated polyaryletherketone film after ultrasonication was placed in a 55°C vacuum drying oven and dried at a constant temperature for 1.5 hours.

[0057] Example 3

[0058] A modified polyaryletherketone, the structural formula of which is:

[0059]

[0060] Among them, n=20%, m=80%.

[0061] The preparation method of the modified polyaryletherketone comprises:

[0062] At a nitrogen rate of 80 ml / min, 0.08 mol of decafluorobiphenyl ketone, 0.02 mol of 4-4'-difluorobenzophenone, and 0.1 mol of biphenyl diphenol were added in sequence to a container equipped with a mechanical stirrer, a thermometer, a condenser, and a Dean-Stark water separator, followed by 0.12 mol of anhydrous cesium carbonate as a catalyst, 15 ml of cyclopentane as a solvent, and 10 ml of toluene as a water-carrying agent. The system was heated to 150°C for azeotropic salt formation and kept at this temperature for 2 hours to remove the water in the system; the temperature was further raised to 175°C and kept at this temperature for 2 hours to remove toluene; the temperature was then raised to 200°C and kept at this temperature for 3 hours. After the high-temperature polymerization reaction, the product was collected and poured into deionized water for cooling treatment, and then the product was crushed and washed 8 times with deionized water and ethanol to remove cyclopentane and inorganic salts, and then filtered. The mixture was placed in a forced air drying oven at 80°C for constant temperature drying for 6 hours, and then placed in a vacuum drying oven at 70°C for constant temperature drying for 18 hours to obtain a white fluorinated polyaryletherketone.

[0063] The particles were extruded using a twin-screw extruder of ZSK25 type and dried at 100°C for 14 hours. They were then placed in a 110×110×0.8mm mold and compression molded at a temperature of 200°C and a pressure of 16MPa. After compression molding, the fluorinated polyaryletherketone film was placed in deionized water to cool for 10 minutes and then placed in a beaker containing toluene. The beaker containing toluene and the fluorinated polyaryletherketone film was placed in an ultrasonic cleaner and ultrasonicated 5 times for 15 minutes each time. The fluorinated polyaryletherketone film after ultrasonication was placed in a 50°C vacuum drying oven and dried at a constant temperature for 2 hours.

[0064] Comparative Example 1

[0065] Referring to the preparation method of polyetheretherketone provided by Ren Wenqing in the background technology, the method comprises:

[0066] Into a four-necked bottle equipped with a mechanical stirrer, a condenser, and a thermometer, 61.0 g of hydroquinone, 117.5 g of 4,4'-difluorobenzophenone, and 323.3 g of diphenyl sulfone were added in sequence, and then stirred. After nitrogen was passed for 30 minutes, heating began, the temperature was raised to 140°C, and then 55.5 g of anhydrous sodium carbonate and 3.7 g of anhydrous potassium carbonate were added, and the temperature was kept for 3 hours; the temperature was raised to 250°C and kept for 1 hour; the temperature was raised to 320°C and kept for 3.5 hours. The sample was cooled and ground to obtain a solid reaction product, which was repeatedly washed with acetone and water to remove the solvent diphenyl sulfone and inorganic salts, and finally the polymer was vacuum dried at 120°C to obtain a white powder solid, namely polyetheretherketone.

[0067] Characterization and test results:

[0068] 1. Infrared spectrum

[0069] Figure 2 This is the infrared absorption spectrum of the modified polyaryletherketone provided in Example 1 of the present invention. 3036cm -1 Corresponding to CH on the benzene ring, 1641.2cm -1 Corresponding to carbonyl, 1598cm -1 and 1491cm -1 Corresponding to benzene ring, 1240cm -1 Corresponding to aromatic ether bond, 1268.9 cm -1 Corresponding to CF.

[0070] Figure 3 This is the ultraviolet absorption spectrum of the modified polyaryletherketone provided in Example 1 of the present invention. The average absorption rate of the fluorinated polyaryletherketone at 200-400nm (within the ultraviolet wavelength range of 100-400nm) is 92.8%, indicating that the experimentally synthesized polyaryletherketone has excellent ultraviolet radiation resistance.

[0071] In the infrared absorption spectrum of polyetheretherketone provided in Comparative Example 1, 1653.62 cm -1 It is the vibration band of C=O stretching, 1600.96cm -1 and 1489.88cm -1 The in-plane vibration band of the ROR benzene ring, 1310.50 cm -1 The in-plane vibration band of the R-CO-R benzene ring, 1223.62 cm -1 Asymmetric stretching vibration band of aromatic ROR, 1185.41 cm -1 、1158.83cm -1 、1113.05cm -1 、1010.27cm -1 It is the absorption band of the CH plane bending vibration of the benzene ring in the aromatic ether or aromatic ketone structure, 926.96cm-1 The symmetrical stretching vibration band of R-CO-R, 836.76 cm -1 、766.86cm -1 It is the absorption band of the CH out-of-plane bending vibration of the benzene ring, and 836.76 cm -1 It is the characteristic peak of para-substitution of the aromatic ring.

[0072] contrast Figure 2 The infrared absorption spectrum of the modified polyaryletherketone and the infrared absorption spectrum of the polyetheretherketone provided in Comparative Example 1 show that the fluorinated polyaryletherketone provided by the present invention has carbonyl, benzene ring, and aromatic ether bond, and at the same time, an additional -1 There are CF bonds at the atmospheric window, and the selective emissivity of the CF bonds is higher, resulting in better radiation cooling performance of fluorinated polyaryletherketone.

[0073] 2. Glass transition temperature

[0074] Table 1 Comparison of thermal properties of products under the preparation conditions of Examples 1 to 3

[0075]

[0076]

[0077] As can be seen from Table 1, the glass transition temperatures of the modified polyaryletherketones provided in Examples 1 to 3 are all relatively high, indicating that the modified polyaryletherketones provided by the present invention have good heat resistance. This is because the modified polyaryletherketone contains a CF bond with a higher bond energy, which makes internal rotation difficult, the interaction force between macromolecules is limited, and the fluorine atom forms a CF bond with the carbon atom on the benzene ring, resulting in p-π conjugation, which is stronger than σ-p conjugation. Therefore, the modified polyaryletherketone has higher thermal stability and chemical stability. In Examples 1 to 3, the molar ratios of decafluorobiphenyl ketone and 4-4'-difluorobenzophenone are 0.2:0.8, 0.4:0.6, and 0.8:0.2, respectively. By changing the molar ratio of decafluorobiphenyl ketone and 4-4'-difluorobenzophenone, it is found that as the addition ratio of decafluorobiphenyl ketone increases, the glass transition temperature of the product fluorinated polyaryletherketone gradually increases. This is because as the content of decafluorobiphenyl ketone increases, the number of CF bonds in the modified polyaryletherketone molecular chain increases, and the bond energy of the CF bond is greater than the bond energy of the CH bond, which strengthens the intermolecular force in the modified polyaryletherketone and requires a higher temperature to destroy the modified polyaryletherketone state.

[0078] 3. Reflectivity test

[0079] A UV-5200 ultraviolet-visible spectrophotometer and a 190-1100 nm wavelength spectrometer were used.

[0080] Turn on the machine and preheat for 15 minutes, set the wavelength range to 200-1000nm, the interval to 10nm, and the accuracy to 10. Test the blank sample first, then test the sample.

[0081] Figure 5 The reflectivity spectrum of the modified polyaryletherketone provided in Example 1 of the present invention at 200-1000nm (included in the sunlight band of 0.3-2.5μm) shows that as the wavelength increases, the reflectivity gradually increases and then tends to be flat. The maximum reflectivity in the wavelength range of 200-1000nm is 84.23%. The higher solar reflectivity can reduce the absorption of sunlight and achieve refrigeration. There are a large number of CH bonds, COC bonds and CF bonds in the molecular chain of the modified polyaryletherketone. These bonds stretch, bend and vibrate in the infrared region (6.7-16.7μm) of the infrared spectrum, overlapping with the atmospheric window (8-13μm), so that the emissivity of the modified polyaryletherketone in the atmospheric window increases; at the same time, the modified polyaryletherketone has a higher reflectivity in the sunlight band, which can reduce the absorption of sunlight. The good emissivity in the atmospheric window and the good reflectivity in the sunlight band enable the modified polyaryletherketone to achieve the functional application of radiation refrigeration.

[0082] Therefore, the modified polyaryletherketone material provided by the present invention has great advantages in heat resistance, chemical stability, mechanical properties, aging resistance, hydrophobicity and resistance to ultraviolet radiation, and can realize its functional application in the fields of aviation, military, automobile, microelectronics, energy, chemical industry, etc.

[0083] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0084] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A modified polyaryletherketone, characterized in that: Its structural formula is: The value range of n is 1 to 40% (m+n), and the value range of m is 60 to 99% (m+n).

2. A method for preparing the modified polyaryletherketone according to claim 1, characterized in that: include: In a nitrogen atmosphere, decafluorobiphenyl ketone, 4-4'-difluorobenzophenone and biphenyl diphenol are mixed, anhydrous carbonate, aprotic polar solvent and water-carrying agent are added, and programmed temperature reaction is carried out at 140-200° C. to obtain the modified polyaryletherketone; The molar ratio of the sum of decafluorobiphenyl ketone and 4-4'-difluorobenzophenone, biphenyl diphenol and anhydrous alkali metal carbonate is 1:(1-1.1):(1-1.3).

3. The method for preparing the modified polyaryletherketone according to claim 2, characterized in that: The molar ratio of decafluorobiphenyl ketone to 4-4'-difluorobenzophenone is (0.2-0.8):(0.8-0.2).

4. The method for preparing the modified polyaryletherketone according to claim 2, characterized in that: The specific reaction conditions are: First increase the temperature to 140-150°C and keep it constant for 2-3 hours; continue to increase the temperature to 165-175°C and keep it constant for 1-2 hours; then increase the temperature to 190-200°C and keep it constant for 3-4 hours.

5. The method for preparing the modified polyaryletherketone according to claim 2, characterized in that: The anhydrous carbonate includes one or two of anhydrous sodium carbonate, anhydrous potassium carbonate and anhydrous cesium carbonate.

6. The method for preparing the modified polyaryletherketone according to claim 2, characterized in that: The water-carrying agent is one or two of toluene and acetone.

7. The method for preparing the modified polyaryletherketone according to claim 2, characterized in that: The aprotic polar solvent is sulfolane.

8. Use of the modified polyaryletherketone according to claim 1 in preparing radiation cooling materials.

9. A radiation cooling material, characterized in that: The invention comprises the modified polyaryletherketone according to claim 1.

10. A method for preparing the radiation cooling material according to claim 9, characterized in that: include: The modified polyaryletherketone is formed by extrusion and molding to obtain the radiation cooling material.

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