A modified polyarylene ether ketone and a preparation method and application thereof

Abstract

The application relates to the technical field of polyaryletherketone, and discloses a modified polyaryletherketone as well as a preparation method and application thereof. The structural formula of the modified polyaryletherketone is as follows: wherein the value range of n is 1-40% (m+n), and the value range of m is 60-99% (m+n). The preparation method is as follows: under a nitrogen atmosphere, decafluorobiphenyl ketone, 4-4'-difluorobenzophenone and biphenol are mixed, anhydrous carbonate, an aprotic polar solvent and a water-carrying agent are added, and a programmed temperature reaction is carried out at 140-200 DEG C to obtain the modified polyaryletherketone; wherein the molar ratio of the sum of the decafluorobiphenyl ketone and the 4-4'-difluorobenzophenone, the biphenol and the anhydrous alkali metal carbonate is 1:(1-1.1):(1-1.3). The modified polyaryletherketone is used for preparing a radiation cooling material.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of polyaryletherketone, and particularly relates to a modified polyaryletherketone as well as a preparation method and application thereof. BACKGROUND

[0002] High-performance polymers refer to polymers containing a large number of aromatic rings in the molecular chain, which exhibit excellent characteristics in terms of thermal stability, chemical stability, mechanical properties and corrosion resistance, and are widely used in the fields of aviation, automobiles, electronics, electrical appliances and chemical industry. Among them, polyaryletherketone as a kind of 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 polyether ether ketone is not good, and it can only be applied to some low-end fields such as compressor parts. Therefore, it is necessary to develop and prepare polyether ether ketone with excellent comprehensive performance.

[0003] The prior art discloses a synthesis research of polyether ether ketone (PEEK), and analyzes that the main reason for the poor comprehensive performance of part of the polyether ether ketone is that the key technologies such as synthesis process equipment and process parameters are not well solved, for example: in the electrophilic synthesis route, there are polymer branching, crosslinking and other side reactions; in the nucleophilic synthesis route, the reaction conditions are harsh, the synthesis process is complex, the monomer price is high, and the cost is high. Therefore, Ren Wenqing developed a preparation method of polyether ether ketone, which adopts a nucleophilic substitution route, specifically uses 4,4'-difluorobenzophenone and hydroquinone to carry out condensation reaction in the presence of alkali metal carbonate, with diphenyl sulfone as a solvent, to prepare polyether ether ketone with good tensile strength, elastic modulus and impact resistance.

[0004] However, the polyether ether ketone prepared by the preparation method has poor heat resistance, and there are few reports on the polyether ether ketone as a radiative cooling material in the prior art. SUMMARY

[0005] The application provides a modified polyaryletherketone, a preparation method and application thereof, which solves the problems of poor heat resistance of the polyether ether ketone prepared by the prior art, and poor radiative cooling performance caused by the absence of groups with selective emission in the structure.

[0006] The first aspect of the application provides a modified polyaryletherketone, and the structural formula is as follows:

[0007]

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

[0009] The second object of the application is to protect the preparation method of the modified polyaryletherketone, which comprises the following steps:

[0010] The modified polyaryletherketone is prepared by mixing the decafluorobiphenyl ketone, 4-4'-difluorobenzophenone and biphenyl diol, adding anhydrous carbonate, aprotic polar solvent and water-carrying agent, and performing programmed temperature reaction at 140-200 DEG C under nitrogen atmosphere; wherein the molar ratio of the sum of the decafluorobiphenyl ketone and 4-4'-difluorobenzophenone, the biphenyl diol and the anhydrous alkali metal carbonate is 1:(1-1.1):(1-1.3).

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

[0012] Preferably, the reaction conditions are as follows:

[0013] First, the temperature is raised to 140-150 DEG C, and kept constant for 2-3 h; then the temperature is continuously raised to 165-175 DEG C, and kept constant for 1-2 h; and then the temperature is continuously raised to 190-200 DEG C, and kept constant for 3-4 h.

[0014] First, the temperature is raised to 140-150 DEG C, and the salt is co-boiled and the water in the system is removed; then the temperature is raised to 165-175 DEG C to remove the water-carrying agent; and then the temperature is continuously raised to 190-200 DEG C for continuous 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 two of toluene and acetone.

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

[0018] The third object of the present application is to protect the use of the modified polyaryletherketone in preparing a radiative cooling material.

[0019] The fourth object of the present application is to protect the radiative cooling material comprising the modified polyaryletherketone.

[0020] The fifth object of the present application is to protect the preparation method of the radiative cooling material, which comprises:

[0021] The modified polyaryletherketone is subjected to extrusion and molding to form the radiative cooling material.

[0022] Preferably, the extruded particles are dried at 100-120 DEG C for 12-14 h, and then subjected to molding.

[0023] Preferably, the molding is performed at a temperature of 190-220 DEG C and a pressure of 15-20 MPa.

[0024] Preferably, the molded processing is followed by cooling, ultrasonic, vacuum drying to form the radiative cooling material.

[0025] Preferably, the cooling is performed in deionized water for 5-10 min; the ultrasonic is performed for 20-30 min, 3-5 times; and the vacuum drying is performed at 50-60℃ for 1-2 h.

[0026] Compared with the prior art, the present application has the following advantages:

[0027] 1. The modified polyaryletherketone provided by the present application has a molecular structure containing C-F bonds with higher bond energy, which not only makes internal rotation difficult, but also limits the interaction force between macromolecules. More importantly, the fluorine atoms form C-F bonds with carbon atoms on the benzene ring, obtaining stronger p-π conjugation than sigma-p conjugation, thereby imparting the modified polyaryletherketone with higher thermal stability and chemical stability. At the same time, the contained fluorine atoms are conducive to the formation of intermolecular hydrogen bonds, enhancing the intermolecular interaction force of the modified polyaryletherketone, so that the modified polyaryletherketone has more outstanding mechanical properties. In addition, due to the strong electronegativity of fluorine, the modified polyaryletherketone can effectively absorb ultraviolet rays and ionizing radiation, effectively change the aggregate structure of macromolecules, and have more excellent aging resistance. Secondly, there are a large number of C-H bonds, C-O-C bonds and C-F bonds in the molecular chain of the modified polyaryletherketone. These bonds have stretching and bending vibrations in the infrared region (6.7-16.7 μm) in the infrared spectrum, which overlaps 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 high reflectivity in the solar wave band, which can reduce the absorption of sunlight. The good emissivity in the atmospheric window and the good reflectivity in the solar wave band make the modified polyaryletherketone realize the functional application of radiative cooling, reducing the consumption of non-renewable energy. Therefore, the modified polyaryletherketone provided by the present application exhibits excellent thermal stability, chemical stability, mechanical properties, aging resistance, and ultraviolet radiation resistance, and can be widely used in the fields of aviation, military and automobile to realize its functional application.

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

[0029] Figure 1 The synthesis route of the modified polyaryletherketone provided by the present application is shown in the figure;

[0030] Figure 2 The infrared absorption spectrum of the modified polyaryletherketone provided by Example 1 of the present application is shown in the figure;

[0031] Figure 3 The ultraviolet absorption spectrum of the modified polyaryletherketone provided by Example 1 of the present application is shown in the figure;

[0032] Figure 4 Synthesis process of polyether ether ketone provided for Comparative Example 1;

[0033] Figure 5 Reflectivity spectrum of modified polyaryletherketone provided for Example 1 of the present application. DETAILED DESCRIPTION

[0034] The technical solutions in the present application will be described clearly and completely below in combination with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0035] The methods described in the embodiments of the present application are all conventional methods unless otherwise specified. The materials, reagents, etc. used are all available from commercial channels unless otherwise specified.

[0036] In the following description of the present embodiment, the term "and / or" is used to describe the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the cases of A alone, B alone and A and B existing at the same time. Wherein, A and B can be singular or plural; the single symbol " / " represents the meaning of "or".

[0037] In the following description of the present embodiment, the term "at least one" means one or more, and "a plurality of" means two or more. "At least one of the following (one)" or similar expressions means any combination of these items, including any combination of single (one) or multiple 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, A+B, A+C, B+C, or A+B+C, wherein A, B, C can be single or multiple.

[0038] In the following description of the present embodiment, the order of the serial numbers does not mean the order of execution, and some or all steps can be executed in parallel or in sequence, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the present embodiment.

[0039] In the following description of the present embodiment, the numerical range should be understood as also specifically disclosing each intermediate value between the upper limit and the lower limit of the range. Each smaller range between any stated value or intermediate value in a stated range and any other stated value or intermediate value in the stated range is also included in the present embodiment, and the upper limit and the lower limit of the smaller range can be independently included or excluded from the range.

[0040] Unless otherwise indicated, the technical / scientific terms used in the present embodiments have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Although preferred methods and materials are described, any methods and materials similar or equivalent to those described herein can be used in the practice of this application. All documents mentioned herein are incorporated by reference to disclose and describe in full the methods and / or materials which are described herein. In case of conflict between the content of the specification and that of any document incorporated herein by reference, the content of the specification prevails.

[0041] The synthetic route of the modified polyaryletherketone in the embodiments of the application is shown in Figure 1 .

[0042] Embodiment 1

[0043] The present embodiments provide a modified polyaryletherketone, which has the structural formula:

[0044]

[0045] wherein n = 80%, m = 20%.

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

[0047] Under the nitrogen flow rate of 70 ml / min, 0.02 mol of decafluorobiphenyl ketone, 0.08 mol of 4-4'-difluorobenzophenone, 0.1 mol of biphenyl diol, 0.12 mol of anhydrous cesium carbonate as a catalyst, 15 ml of cyclobutane sulfone as a solvent, and 10 ml of toluene as a water-carrying agent were sequentially added into a container equipped with mechanical stirring, a thermometer, a condenser, and a Dean-Stark trap. The system was raised to 140°C to azeotropically salt out, and was kept at this temperature for 3 h to remove the water in the system; the temperature was continuously raised to 165°C and kept at this temperature for 1 h to remove toluene; the temperature was further raised to 190°C, and after keeping at this temperature for 4 h, the product was collected and cooled in deionized water; then the product was crushed and washed with deionized water and ethanol for 6 times to remove cyclobutane sulfone and inorganic salts; after filtration, the product was dried in a blast drying oven at 70°C for 8 h, and then placed in a vacuum drying oven at 65°C for 20 h to obtain white fluorine-containing polyaryletherketone, i.e., the modified polyaryletherketone.

[0048] A preparation method of a radiative cooling material comprises:

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

[0050] Example 2

[0051] A modified polyaryletherketone has the following structural formula:

[0052]

[0053] wherein n = 60% and m = 40%.

[0054] A method for preparing the modified polyaryletherketone includes:

[0055] Under a nitrogen flow rate of 65 ml / min, 0.04 mol of dodecafluorobenzophenone, 0.06 mol of 4-4'-difluorobenzophenone, 0.1 mol of diphenylolpropane, 0.12 mol of anhydrous cesium carbonate as a catalyst, 15 ml of cyclobutane sulfone as a solvent, and 10 ml of toluene as a water-carrying agent were sequentially added to a container equipped with a mechanical stirrer, a thermometer, a condenser, and a Dean-Stark trap. The system was raised to a temperature of 150°C to azeotropically remove water for 2 hours. The temperature was then raised to 170°C to remove toluene for 1.5 hours. The temperature was then raised to 195°C, and constant temperature drying was performed for 3.5 hours. After high-temperature polymerization, the product was collected and cooled in deionized water. The product was then crushed, washed with deionized water and ethanol 7 times to remove cyclobutane sulfone and inorganic salts, and filtered. The product was then placed in a forced air drying oven at 70°C for constant temperature drying for 8 hours, and then placed in a vacuum drying oven at 60°C for constant temperature drying for 24 hours to obtain a white fluorine-containing polyaryletherketone.

[0056] The granules were extruded using a twin-screw extruder of ZSK25 specification, and the granules were dried at 120°C for 12 hours. Subsequently, the granules were placed in a mold of 120 mm x 120 mm x 1 mm, and compression molding was performed at a temperature of 220°C and a pressure of 20 MPa. After compression molding, the fluorine-containing polyaryletherketone film was placed in deionized water for cooling for 8 minutes, and then placed in a beaker containing cyclohexane. The beaker containing the cyclohexane and the fluorine-containing polyaryletherketone film was placed in an ultrasonic cleaner, and ultrasonic treatment was performed 5 times for 20 minutes each time. The fluorine-containing polyaryletherketone film after ultrasonic treatment was placed in a vacuum drying oven at 55°C for constant temperature drying for 1.5 hours.

[0057] Example 3

[0058] A modified polyaryletherketone, with the following structural formula:

[0059]

[0060] Where n = 20% and m = 80%.

[0061] The method for preparing the modified polyaryletherketone includes:

[0062] Under nitrogen flow rate of 80 ml / min, 0.08 mol of decafluorobenzyl ketone, 0.02 mol of 4-4'-difluorobenzophenone, and 0.1 mol of biphenylhydrazine were sequentially added to a container equipped with a mechanical stirrer, thermometer, condenser, and Dean-Stark water separator. Then, 0.12 mol of anhydrous cesium carbonate was added as a catalyst, 15 ml of sulfolane as a solvent, and 10 ml of toluene as a dehydrating agent. The system was heated to 150 °C for azeotropic salt formation and held at this temperature for 2 h to remove moisture. The temperature was then further increased to 175 °C and held for 2 h to remove toluene. Finally, the temperature was increased to 200 °C and held for 3 h. After the high-temperature polymerization reaction, the product was collected and cooled in deionized water. The product was then pulverized and washed eight times with deionized water and ethanol to remove sulfolane and inorganic salts before filtration. The mixture was dried at a constant temperature of 80℃ in a forced-air drying oven for 6 hours, and then placed in a vacuum drying oven at 70℃ for 18 hours to obtain a white fluorinated polyarylether ketone.

[0063] Granulations were extruded using a ZSK25 twin-screw extruder and dried at 100℃ for 14 hours. The granules were then placed into a 110×110×0.8mm mold and compression molded at 200℃ and 16MPa. After compression molding, the fluorinated polyaryletherketone film was cooled in deionized water 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 ultrasonically cleaned 5 times for 15 minutes each time. The ultrasonically cleaned fluorinated polyaryletherketone film was then placed in a 50℃ 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 art, it includes:

[0066] Into a four-necked flask equipped with mechanical stirring, condenser, thermometer, 61.0 g of hydroquinone, 117.5 g of 4,4'-difluorobenzophenone, 323.3 g of diphenyl sulfone were sequentially added, then stirred, and after nitrogen was bubbled for 30 min, heating was started, and 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 h; the temperature was raised to 250°C, and the temperature was kept for 1 h; and the temperature was raised to 320°C, and the temperature was kept for 3.5 h. The removed sample was cooled, ground, and a solid reaction product was obtained, 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, i.e., polyether ether ketone.

[0067] Characterization and test results:

[0068] 1. Infrared spectrum

[0069] Figure 2 The infrared absorption spectrum of the modified polyaryletherketone provided in Example 1 of the present application. 3036 cm -1 corresponding to C-H on the benzene ring, 1641.2 cm -1 corresponding to carbonyl, 1598 cm -1 and 1491 cm -1 corresponding to benzene ring, 1240 cm -1 corresponding to aryl ether bond, 1268.9 cm -1 corresponding to C-F.

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

[0071] In the infrared absorption spectrum of the polyether ether ketone provided in Comparative Example 1, 1653.62 cm -1 is the vibration spectrum band of C=O stretching, 1600.96 cm -1 and 1489.88 cm -1 are the in-plane vibration spectrum bands of R-O-R benzene ring, 1310.50 cm -1 are the in-plane vibration spectrum bands of R-CO-R benzene ring, 1223.62 cm -1 is the asymmetric stretching vibration spectrum band of aromatic R-O-R, 1185.41 cm -1 , 1158.83 cm -1 , 1113.05 cm -1 , 1010.27 cm -1 are the in-plane bending vibration absorption spectrum bands of C-H of benzene ring in aryl ether or aryl ketone structure, 926.96 cm-1 symmetric stretching vibration band of R-CO-R, 836.76 cm -1 , 766.86 cm -1 out-of-plane bending vibration absorption band of C-H of benzene ring, and 836.76 cm -1 characteristic peak of para-substitution of aromatic ring.

[0072] Comparative Figure 2 The infrared absorption spectrum of the modified polyaryletherketone provided in the present application and the infrared absorption spectrum of the polyether ether ketone provided in Comparative Example 1 can be seen that the fluorine-containing polyaryletherketone provided in the present application has carbonyl, benzene ring, arylether bond, and additionally has C-F bond at 1268.9 cm -1 The C-F bond has higher selective emissivity at the atmospheric window, resulting in more excellent radiation cooling performance of the fluorine-containing polyaryletherketone.

[0073] 2, glass transition temperature

[0074] Table 1 Comparative Example 1-3 Product thermal performance under the preparation conditions

[0075]

[0076]

[0077] As can be seen from Table 1, the glass transition temperature of the modified polyaryletherketone provided in Examples 1-3 is higher, indicating that the modified polyaryletherketone provided in the present application has good heat resistance. This is because the modified polyaryletherketone contains C-F bond with higher bond energy, making it difficult to rotate, and the interaction force between macromolecules is limited, and the fluorine atom forms C-F bond with the carbon atom on the benzene ring, resulting in p-π conjugation, which is stronger than σ-p conjugation, so the modified polyaryletherketone has high thermal stability and chemical stability. The molar ratio of decafluorobiphenyl ketone and 4-4'-difluorobenzophenone in Examples 1-3 is 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 proportion of decafluorobiphenyl ketone increases, the glass transition temperature of the fluorine-containing polyaryletherketone gradually increases. This is because as the content of decafluorobiphenyl ketone increases, the number of C-F bonds in the modified polyaryletherketone molecular chain increases, and the bond energy of C-F bond is greater than that of C-H bond, so the intermolecular force in the modified polyaryletherketone is enhanced, and the temperature required to destroy the state of the modified polyaryletherketone is higher.

[0078] 3, reflectivity test

[0079] UV-5200 type ultraviolet visible spectrophotometer, 190-1100 nm wavelength spectrometer was used.

[0080] Turn on preheating for 15 min, set wavelength range of 200-1000 nm, interval of 10 nm, precision of 10. First test the blank sample, then load the sample for testing.

[0081] Figure 5 The reflectivity spectrum of the modified polyaryletherketone provided for the embodiment 1 of the present application in 200-1000 nm (including 0.3-2.5 μm in the solar light band) gradually increases and then tends to be flat with the increase of wavelength, and the maximum reflectivity in the wavelength range of 200-1000 nm is 84.23%, the higher solar reflectivity can reduce the absorption of sunlight, and realize refrigeration. There are a large number of C-H bonds, C-O-C bonds and C-F bonds in the molecular chain of the modified polyaryletherketone, the stretching and bending vibration of these bonds in the infrared region (6.7-16.7 μm) in the infrared spectrum overlaps 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 high reflectivity in the solar light band, which can reduce the absorption of sunlight. The good emissivity in the atmospheric window and the good reflectivity in the solar light band make the modified polyaryletherketone realize the functional application of radiation refrigeration.

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

[0083] Although the preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including all changes and modifications falling within the scope of the present application.

[0084] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the present application. Thus, if these modifications and changes fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and changes.

Claims

1. A modified polyaryletherketone, characterized in that, Its structural formula is: Where n ranges from 1 to 40%(m+n), and m ranges from 60% to 99%(m+n).

2. A method for preparing the modified polyaryletherketone according to claim 1, characterized in that, include: Under a nitrogen atmosphere, decafluorobenzyl ketone, 4-4'-difluorobenzophenone, and biphenyl hydroquinone were mixed, and then anhydrous carbonate, a non-protic polar solvent, and a dehydrating agent were added. The mixture was subjected to a programmed temperature increase reaction at 140–200 °C to obtain the modified polyarylether ketone. The molar ratio of the total amount of decafluorobenzyl ketone and 4-4'-difluorobenzophenone, biphenyl hydroquinone, and anhydrous carbonate is 1:(1-1.1):(1-1.3).

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

4. The method for preparing modified polyaryletherketone according to claim 2, characterized in that, The specific reaction conditions are as follows: First, raise the temperature to 140-150℃ and hold it for 2-3 hours; then raise the temperature to 165-175℃ and hold it for 1-2 hours; finally, raise the temperature to 190-200℃ and hold it for 3-4 hours.

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

6. The method for preparing modified polyaryletherketone according to claim 2, characterized in that, The dehydrating agent is one or both of toluene and acetone.

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

8. The use of the modified polyaryletherketone of claim 1 in the preparation of radiation cooling materials.

9. A radiation cooling material, characterized in that, It contains the modified polyaryletherketone as described in claim 1.

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

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