Porous polyaryletherketone film and preparation method thereof

Abstract

The invention provides a porous polyaryletherketone film and a preparation method thereof, and belongs to the technical field of polyaryletherketone film preparation. The porous polyaryletherketone film is prepared from polyaryletherketone with a specific structure, and the preparation method comprises the following steps: firstly, dissolving polyaryletherketone in an organic solvent to obtain a polyaryletherketone solution; uniformly smearing the polyaryletherketone solution on the surface of a substrate to obtain a membrane precursor; soaking the membrane precursor in a coagulating bath, taking out and drying to obtain a porous polyaryletherketone membrane; wherein the coagulating bath is a mixed solution of an organic solvent and water. According to the method, the polyaryletherketone is crystallized and formed by utilizing the solubility difference of the polyaryletherketone in an organic solvent and water, and the double-diffusion speed is controlled by regulating and controlling the temperature of a coagulating bath and the solvent proportion, so that the densification degree is controlled, and the porous polyaryletherketone film is obtained. The preparation method is simple to operate, low in cost and free of high temperature, the densification degree of the prepared porous polyaryletherketone film is controllable, and the preparation method can be applied to large-scale production of the porous polyaryletherketone film.

Description

Technical Field

[0001] The present invention relates to the technical field of polyaryletherketone film preparation, in particular to a porous polyaryletherketone film and a preparation method thereof. Background Art

[0002] Polyaryletherketone (PEEK), abbreviated as PEEK, is a crystalline polymer composed of phenylene rings connected by oxygen bridges (ether bonds) and carbonyl groups (ketones). Depending on the order and ratio of the ether bonds, ketone groups, and benzene rings in the molecular chain, various polymers can be formed, including polyetheretherketone (PEEK), polyetherketone (PEK), polyetherketoneketone (PEKK), polyetheretherketoneketone (PEEKK), and polyetherketoneetherketoneketone (PEKEKK). The rigid benzene rings in PEEK's molecular structure make it a high-performance specialty engineering plastic that exhibits excellent properties across a wide range of conditions, including high-temperature resistance, mechanical strength, chemical resistance, electrical insulation, wear resistance, and low moisture absorption. Porous PEEK films not only share many of the excellent properties of PEEK but also possess the advantages of low density, high specific surface area, and low dielectric constant. These porous films have broad application prospects and significant commercial value in aerospace, gas separation, and thermal insulation applications.

[0003] At present, the preparation methods of porous polyaryletherketone films mainly include thermal phase separation method, melt stretching method and other methods. Among them, the thermal phase separation method uses a potential solvent, which is a solvent at high temperature and a non-solvent at a lower temperature. The potential solvent and the polymer are mixed into a uniform solution at high temperature, and then the solution is spread into a flat film of a certain thickness; then the solution is cooled or quenched at a certain speed to cause phase separation and solidification, and the solvent dispersed in the film precursor is extracted with a common solvent to finally form a microporous structure. The porous film formed by the thermal phase separation method has good strength and uniform pore formation. The disadvantage is that the film has poor flexibility and the pore size is difficult to control. The melt stretching method is generally for crystalline polymers. The process is to first extrude a flat film under a stress field, and then stretch it at a temperature close to the melting point of the polymer, controlling a certain stretching speed. Generally, cold drawing is performed first, and then hot drawing is performed to destroy the crystal structure of the film. Finally, the stretched film is heat-set at a certain temperature to retain the microporous structure generated by stretching to obtain a porous film. Porous membranes prepared by melt stretching have regular, large pore sizes and easily controlled void size, but suffer from low tensile strength. Both methods require high temperatures and equipment, making them unsuitable for large-scale production. Furthermore, controlling the densification of the membrane is cumbersome.

[0004] Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a porous polyaryletherketone film and a preparation method thereof, aiming to solve the problems that the existing porous polyaryletherketone film preparation method is cumbersome to operate, has harsh conditions, and the densification degree of the obtained porous polyaryletherketone film is uncontrollable.

[0006] The technical solutions of the present invention are as follows:

[0007] In a first aspect of the present invention, a porous polyaryletherketone film is provided, wherein the raw material polyaryletherketone used to prepare the porous polyaryletherketone film is selected from 、 、

[0008] One or more of; wherein n, m, x, y are all positive integers, representing the number of repeating units.

[0009] The second aspect of the present invention provides a method for preparing the porous polyaryletherketone film described in the above technical solution, comprising the steps of:

[0010] dissolving polyaryletherketone in an organic solvent to obtain a polyaryletherketone solution;

[0011] uniformly applying the polyaryletherketone solution on a substrate surface to obtain a film precursor;

[0012] soaking the membrane precursor in a coagulation bath, taking it out and drying it to obtain a porous polyaryletherketone film;

[0013] Wherein, the coagulation bath is a mixed solution of an organic solvent and water.

[0014] Preferably, the mass percentage of polyaryletherketone in the polyaryletherketone solution is 16-20%.

[0015] Preferably, the thickness of the film precursor is 100-500 μm.

[0016] Preferably, in the coagulation bath, the volume ratio of the organic solvent to water is 1:0.1-10.

[0017] Preferably, the soaking temperature is -5 to 50° C., and the soaking time is 3 to 5 minutes.

[0018] Preferably, the drying temperature is 20-30° C. and the drying time is 48-60 hours.

[0019] Preferably, the organic solvent is selected from one or more of N-methylpyrrolidone, N,N-dimethylacetamide and chloroform.

[0020] Preferably, the substrate is selected from one of a glass plate, a ceramic plate, a polyvinyl chloride plate, a polycarbonate plate, and a stainless steel plate.

[0021] Beneficial Effects: Compared with the prior art, the present invention provides a porous poly(aryletherketone) film prepared using poly(aryletherketone) with a specific structure. The poly(aryletherketone) with a specific structure is crystallized by utilizing the difference in solubility between organic solvents and water. By regulating the temperature and solvent ratio of the coagulation bath, the double diffusion rate, and thus the degree of densification, is controlled to obtain the porous poly(aryletherketone) film. Furthermore, the preparation method provided by the present invention is simple to operate, low-cost, and does not require high temperatures. The prepared porous poly(aryletherketone) film has a controllable degree of densification and can be applied to the large-scale production of porous poly(aryletherketone) films. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a flow chart for preparing the porous polyaryletherketone film of the present invention;

[0023] Figure 2 is a scanning electron microscope image of a cross section of a porous polyaryletherketone film according to Example 1 of the present invention;

[0024] Figure 3 is a scanning electron microscope image of a cross section of a porous polyaryletherketone film according to Example 2 of the present invention;

[0025] Figure 4 is a scanning electron microscope image of a cross section of a porous polyaryletherketone film according to Example 3 of the present invention;

[0026] Figure 5 is a scanning electron microscope image of a cross section of a porous polyaryletherketone film according to Example 4 of the present invention;

[0027] Figure 6 is a scanning electron microscope image of a cross section of a porous polyaryletherketone film according to Example 5 of the present invention;

[0028] Figure 7 is a scanning electron microscope image of a cross section of a porous polyaryletherketone film according to Example 6 of the present invention;

[0029] Figure 8 is a scanning electron microscope image of a cross section of a porous polyaryletherketone film according to Example 7 of the present invention;

[0030] Figure 9 is a scanning electron microscope image of a cross section of a porous polyaryletherketone film according to Example 8 of the present invention;

[0031] Figure 10 This is a scanning electron microscope image of the cross section of the porous polyaryletherketone film of Example 9 of the present invention. DETAILED DESCRIPTION

[0032] The present invention provides a porous polyaryletherketone film and a method for preparing the same. To clarify the objectives, technical solutions, and effects of the present invention, the present invention is described in further detail below. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention.

[0033] The present invention provides a porous polyaryletherketone film, wherein the raw material polyaryletherketone used to prepare the porous polyaryletherketone film is selected from 、 、

[0034] One or more of; wherein n, m, x, y are all positive integers, representing the number of repeating units

[0035] The polyaryletherketone in the present invention is a common fluorene-containing polyaryletherketone, naphthalene-containing polyaryletherketone, or naphthalene-containing polyethersulfoneketone, which is soluble in an organic solvent, but is not limited thereto.

[0036] Fluorene-containing polyaryletherketone For example, the preparation method of polyaryletherketone includes:

[0037] In a 100 mL three-necked flask equipped with nitrogen, mechanical stirring, a water separator, and a condenser reflux tube, bisphenol fluorene (5.5506 g, 15.84 mmol), 4,4'-difluorobenzophenone (3.5283 g, 16.17 mmol), anhydrous potassium carbonate (3.0648 g, 22.176 mmol), 10 mL of a mixed solvent (sulfolane: N-methylpyrrolidone, 7:1), and 20 mL of toluene were added in sequence. The reaction system was then heated to reflux to promote the formation of phenolate from bisphenol fluorene and to remove the byproduct water with the help of toluene. After the water was completely removed, the excess toluene was distilled off and the reaction system was gradually heated to 190°C. The reaction was continued under this condition, with appropriate addition of solvent to suppress local implosion. The reaction was stopped when the viscosity of the reaction system no longer increased, and an appropriate amount of solvent was added to reduce the viscosity of the system. Finally, the reaction system was slowly poured into hot water containing hydrochloric acid to obtain a white fibrous product with the structural formula Fluorene-containing polyaryletherketone.

[0038] Furthermore, the fluorene-containing polyaryletherketone is purified, comprising:

[0039] 10 g of crude fluorene-containing polyaryletherketone is placed in 100 mL of deionized water and boiled for 1 to 24 hours to fully remove inorganic salts and solvents, and dried for later use; then, the fluorene-containing polyaryletherketone is dissolved in chloroform, and the ratio of fluorene-containing polyaryletherketone to chloroform is 1 g:15 mL; finally, the chloroform solution of fluorene-containing polyaryletherketone is filtered to obtain a filtrate, and the filtrate is poured into 100 mL of anhydrous ethanol, and a light yellow flocculent is precipitated by sedimentation, which is dried in a 120° C. forced air oven to obtain refined fluorene-containing polyaryletherketone, which is a polyaryletherketone soluble in an organic solvent.

[0040] The present invention also provides a method for preparing the porous polyaryletherketone film of the above technical solution, comprising the steps of:

[0041] dissolving polyaryletherketone in an organic solvent to obtain a polyaryletherketone solution;

[0042] uniformly applying the polyaryletherketone solution on a substrate surface to obtain a film precursor;

[0043] soaking the membrane precursor in a coagulation bath, taking it out and drying it to obtain a porous polyaryletherketone film;

[0044] Wherein, the coagulation bath is a mixed solution of an organic solvent and water.

[0045] In one embodiment, the organic solvent is selected from one or more of N-methylpyrrolidone (NMP), N,N-dimethylacetamide (DMAc), and chloroform (TCM), but is not limited thereto. The organic solvent of the present invention is a solvent for polyaryletherketone, and therefore, any organic solvent that can dissolve polyaryletherketone can be used.

[0046] In one embodiment, the mass percentage of polyaryletherketone in the polyaryletherketone solution is preferably 16-20%.

[0047] In one embodiment, the substrate is selected from a glass plate, a ceramic plate, a polyvinyl chloride plate, a polycarbonate plate, and a stainless steel plate, but is not limited thereto. The substrate of the present invention serves only as a template to support the polyaryletherketone solution, and thus any flat plate with a smooth surface that does not penetrate can be used.

[0048] In one embodiment, the thickness of the film precursor is preferably 100-500 μm.

[0049] In one embodiment, the volume ratio of the organic solvent to water in the coagulation bath is preferably 1:0.1-10. In the present invention, when the proportion of water in the coagulation bath increases, the double diffusion rate accelerates, larger pores are formed in the porous poly(aryletherketone) film, and the degree of densification increases. When the proportion of water in the coagulation bath decreases, the double diffusion rate slows, smaller pores are formed in the porous poly(aryletherketone) film, and the degree of densification decreases. By regulating the volume ratio of the organic solvent to water in the coagulation bath, the present invention can control the double diffusion rate, and thus the degree of densification, to obtain a porous poly(aryletherketone) film with a controllable degree of densification.

[0050] In one embodiment, the immersion temperature is preferably -5 to 50°C, and the time is preferably 3 to 5 minutes. The present invention solidifies the membrane precursor by immersion. In the present invention, when the temperature during immersion increases, the double diffusion rate accelerates, the porous polyaryletherketone film will form larger holes, and the degree of densification will increase; when the temperature during immersion decreases, the double diffusion rate slows down, the porous polyaryletherketone film will form smaller holes, and the degree of densification will decrease. By regulating the immersion temperature, the present invention can control the double diffusion rate and then control the degree of densification, thereby obtaining a porous polyaryletherketone film with controllable degree of densification.

[0051] In one embodiment, the drying temperature is 20-30° C. and the drying time is 48-60 hours. The present invention removes the residual solvent on the surface and in the pores of the porous polyaryletherketone film by drying.

[0052] In the present invention, a solvent concentration difference exists between a membrane precursor containing an organic solvent and a coagulation bath containing an organic solvent and water. This solvent concentration difference promotes double diffusion within the membrane precursor, with the organic solvent in the membrane precursor diffusing into the coagulation bath, and the water in the coagulation bath diffusing into the membrane precursor, thereby forming a porous poly(aryletherketone) film. By regulating the temperature and solvent ratio of the coagulation bath, the present invention can control the double diffusion rate, and thus the degree of densification, to obtain a porous poly(aryletherketone) film with a controllable degree of densification.

[0053] In a specific technical solution of the present invention, the following steps are included:

[0054] ① Dissolve polyaryletherketone in N-methylpyrrolidone to obtain a uniform and transparent polyaryletherketone solution;

[0055] ② Scraping the polyaryletherketone solution onto a smooth glass plate with a doctor blade to obtain a film precursor;

[0056] ③ The membrane precursor is quickly immersed in a mixed solution of N-methylpyrrolidone and water until solidified, and then taken out and dried in a low-temperature oven to obtain a porous polyaryletherketone film;

[0057] The thickness of the scraper is 300 μm; the size of the glass plate is 5×5 cm; the time of drying in the low-temperature oven is 48 hours; and the temperature of the low-temperature oven is 30° C.

[0058] An embodiment of the present invention provides a porous polyaryletherketone film, which is prepared using the preparation method described above.

[0059] The present invention will be further described below with reference to specific examples.

[0060] Example 1

[0061] A porous polyaryletherketone film, wherein the raw material polyaryletherketone used to prepare the porous polyaryletherketone film is a refined fluorene-containing polyaryletherketone with the structural formula Wherein, n is a positive integer, indicating the number of repeating units;

[0062] The preparation method of the porous polyaryletherketone film comprises the following steps:

[0063] 0.9790g of polyaryletherketone and 5mL of N-methylpyrrolidone were added to a 50mL flask and stirred in a 70℃ oil bath for 1 hour to obtain a clear solution. The flask containing the clear solution was placed in a 60℃ oven and allowed to stand for 30 minutes to remove bubbles. After the bubbles were removed, the clear solution was allowed to stand at room temperature. 0.5mL was taken and smoothed on a glass plate with a 300μm doctor blade to obtain a film precursor. The film was then quickly immersed in a 25℃ mixed solution of N-methylpyrrolidone:water = 5:5 for 3 minutes and then removed to obtain a solidified film. The solidified film was placed in a 30℃ oven for 48 hours to remove the solvent, resulting in a porous polyaryletherketone film.

[0064] Example 2

[0065] A method for preparing a porous polyaryletherketone film, comprising the following steps:

[0066] 0.9790g of polyaryletherketone and 5mL of N-methylpyrrolidone were added to a 50mL flask and stirred in a 70℃ oil bath for 1 hour to obtain a clear solution. The flask containing the clear solution was placed in a 60℃ oven and allowed to stand for 30 minutes to remove bubbles. After the bubbles were removed, the clear solution was allowed to stand at room temperature. 0.5mL was taken and smoothed on a glass plate using a 300μm doctor blade to obtain a film precursor. The film was then quickly immersed in a mixed solution of N-methylpyrrolidone: water = 6:4 at 25℃ for 3 minutes and then removed to obtain a solidified film. The solidified film was placed in a 30℃ oven for 48 hours to remove the solvent, resulting in a porous polyaryletherketone film.

[0067] In this embodiment, the polyaryletherketone used is the same as that in Example 1.

[0068] Example 3

[0069] A method for preparing a porous polyaryletherketone film, comprising the following steps:

[0070] 0.9790g of polyaryletherketone and 5mL of N-methylpyrrolidone were added to a 50mL flask and stirred in a 70℃ oil bath for 1 hour to obtain a clear solution. The flask containing the clear solution was placed in a 60℃ oven and allowed to stand for 30 minutes to remove bubbles. After the bubbles were removed, the clear solution was allowed to stand at room temperature. 0.5mL was taken and smoothed on a glass plate with a 300μm doctor blade to obtain a film precursor. The film was then quickly immersed in a mixed solution of N-methylpyrrolidone: water = 7:3 at 25℃ for 3 minutes and then removed to obtain a solidified film. The solidified film was placed in a 30℃ oven for 48 hours to remove the solvent, resulting in a porous polyaryletherketone film.

[0071] In this embodiment, the polyaryletherketone used is the same as that in Example 1.

[0072] Example 4

[0073] A method for preparing a porous polyaryletherketone film, comprising the following steps:

[0074] 0.9790g of polyaryletherketone and 5mL of N-methylpyrrolidone were added to a 50mL flask and stirred in a 70℃ oil bath for 1 hour to obtain a clear solution. The flask containing the clear solution was placed in a 60℃ oven for 30 minutes to remove bubbles. After the bubbles were removed, the clear solution was allowed to cool to room temperature. 0.5mL was taken and smoothed on a glass plate using a 300μm doctor blade to obtain a film precursor. The film was then quickly immersed in a 50℃ N-methylpyrrolidone:water mixture for 3 minutes and then removed to obtain a solidified film. The solidified film was placed in a 30℃ oven for 48 hours to remove the solvent, resulting in a porous polyaryletherketone film.

[0075] In this embodiment, the polyaryletherketone used is the same as that in Example 1.

[0076] Example 5

[0077] A method for preparing a porous polyaryletherketone film, comprising the following steps:

[0078] 0.9790g of polyaryletherketone and 5mL of N-methylpyrrolidone were added to a 50mL flask and stirred in a 70℃ oil bath for 1 hour to obtain a clear solution. The flask containing the clear solution was placed in a 60℃ oven and allowed to stand for 30 minutes to remove bubbles. After the bubbles were removed, the clear solution was allowed to stand at room temperature. 0.5mL was taken and smoothed on a glass plate with a 300μm doctor blade to obtain a film precursor. The film was then quickly placed in a mixed solution of N-methylpyrrolidone: water = 6:4 at 50℃ and immersed for 3 minutes. After removal, a solidified film was obtained. The solidified film was placed in a 30℃ oven for 48 hours to remove the solvent, resulting in a porous polyaryletherketone film.

[0079] In this embodiment, the polyaryletherketone used is the same as that in Example 1.

[0080] Example 6

[0081] A method for preparing a porous polyaryletherketone film, comprising the following steps:

[0082] 0.9790g of polyaryletherketone and 5mL of N-methylpyrrolidone were added to a 50mL flask and stirred in a 70℃ oil bath for 1 hour to obtain a clear solution. The flask containing the clear solution was placed in a 60℃ oven and allowed to stand for 30 minutes to remove bubbles. After the bubbles were removed, the clear solution was allowed to stand at room temperature. 0.5mL was taken and smoothed on a glass plate with a 300μm doctor blade to obtain a film precursor. The film was then quickly placed in a mixed solution of N-methylpyrrolidone:water = 7:3 at 50℃ and immersed for 3 minutes. After removal, a solidified film was obtained. The solidified film was placed in a 30℃ oven for 48 hours to remove the solvent, obtaining a porous polyaryletherketone film.

[0083] In this embodiment, the polyaryletherketone used is the same as that in Example 1.

[0084] Example 7

[0085] A method for preparing a porous polyaryletherketone film, comprising the following steps:

[0086] 0.9790g of polyaryletherketone and 5mL of N-methylpyrrolidone were added to a 50mL flask and stirred in a 70℃ oil bath for 1 hour to obtain a clear solution. The flask containing the clear solution was placed in a 60℃ oven and allowed to stand for 30 minutes to remove bubbles. After the bubbles were removed, the clear solution was allowed to stand at room temperature. 0.5mL was taken and smoothed on a glass plate with a 300μm doctor blade to obtain a film precursor. The film was then quickly placed in a mixed solution of N-methylpyrrolidone: water = 5:5 at -5℃ and immersed for 3 minutes. After removal, a solidified film was obtained. The solidified film was placed in a 30℃ oven for 48 hours to remove the solvent, obtaining a porous polyaryletherketone film.

[0087] In this embodiment, the polyaryletherketone used is the same as that in Example 1.

[0088] Example 8

[0089] A method for preparing a porous polyaryletherketone film, comprising the following steps:

[0090] 0.9790 g of polyaryletherketone and 5 mL of N-methylpyrrolidone were added to a 50 mL flask and stirred in a 70°C oil bath for 1 hour to obtain a clear solution. The flask containing the clear solution was placed in a 60°C oven and allowed to stand for 30 minutes to remove bubbles. After the bubbles were removed, the clear solution was allowed to cool to room temperature. 0.5 mL was taken and smoothed on a glass plate using a 300 μm doctor blade to obtain a film precursor. The film was then quickly immersed in a mixed solution of N-methylpyrrolidone and water at -5°C for 3 minutes and then removed to obtain a solidified film. The solidified film was placed in a 30°C oven for 48 hours to remove the solvent, resulting in a porous polyaryletherketone film.

[0091] In this embodiment, the polyaryletherketone used is the same as that in Example 1.

[0092] Example 9

[0093] A method for preparing a porous polyaryletherketone film, comprising the following steps:

[0094] 0.9790g of polyaryletherketone and 5mL of N-methylpyrrolidone were added to a 50mL flask and stirred in a 70℃ oil bath for 1 hour to obtain a clear solution. The flask containing the clear solution was placed in a 60℃ oven for 30 minutes to remove bubbles. After the bubbles were removed, the clear solution was allowed to cool to room temperature. 0.5mL was taken and smoothed on a glass plate using a 300μm doctor blade to obtain a film precursor. The film was then quickly immersed in a mixed solution of N-methylpyrrolidone: water = 7:3 at -5℃ for 3 minutes and then removed to obtain a solidified film. The solidified film was placed in a 30℃ oven for 48 hours to remove the solvent, resulting in a porous polyaryletherketone film.

[0095] In this embodiment, the polyaryletherketone used is the same as that in Example 1.

[0096] The scanning electron microscope images of the cross sections of the porous polyaryletherketone films prepared in Examples 1 to 9 are as follows: Figures 2 to 10 The average size of the micropores is shown in Table 1.

[0097] Table 1: Average pore size of the porous polyaryletherketone film cross section prepared in Examples 1 to 9

[0098]

[0099] Depend on Figures 2 to 10 As can be seen from Table 1, in Examples 1 to 3, when the coagulation bath temperature is 25°C, as the proportion of N-methylpyrrolidone in the coagulation bath gradually increases, the average size of the micropores in the cross-section of the porous polyaryletherketone film gradually decreases; in Examples 4 to 6, when the coagulation bath temperature is 50°C, as the proportion of N-methylpyrrolidone in the coagulation bath gradually increases, the average size of the micropores in the cross-section of the porous polyaryletherketone film gradually decreases; in Examples 7 to 9, when the coagulation bath temperature is -5°C, as the proportion of N-methylpyrrolidone in the coagulation bath gradually increases, the average size of the micropores in the cross-section of the porous polyaryletherketone film gradually decreases. In Examples 1, 4, and 7, when the ratio of N-methylpyrrolidone to water in the coagulation bath is 5:5, as the coagulation bath temperature gradually increases, the average size of the micropores in the cross-section of the porous polyaryletherketone film gradually increases; in Examples 2, 5, and 8, when the ratio of N-methylpyrrolidone to water in the coagulation bath is 6:4, as the coagulation bath temperature gradually increases, the average size of the micropores in the cross-section of the porous polyaryletherketone film gradually increases; in Examples 3, 6, and 9, when the ratio of N-methylpyrrolidone to water in the coagulation bath is 7:3, as the coagulation bath temperature gradually increases, the average size of the micropores in the cross-section of the porous polyaryletherketone film gradually increases.

[0100] It should be understood that the application of the present invention is not limited to the above examples. For those skilled in the art, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A porous polyaryletherketone film, characterized in that The raw material polyaryletherketone used to prepare the porous polyaryletherketone film is selected from 、 、 One or more of; wherein n, m, x, y are all positive integers, representing the number of repeating units.

2. A method for preparing the porous polyaryletherketone film according to claim 1, characterized in that: Including steps: dissolving polyaryletherketone in an organic solvent to obtain a polyaryletherketone solution; uniformly applying the polyaryletherketone solution on a substrate surface to obtain a film precursor; soaking the membrane precursor in a coagulation bath, taking it out and drying it to obtain a porous polyaryletherketone film; Wherein, the coagulation bath is a mixed solution of an organic solvent and water.

3. The method for preparing a porous polyaryletherketone film according to claim 2, wherein: In the polyaryletherketone solution, the mass percentage of polyaryletherketone is 16-20%.

4. The method for preparing a porous polyaryletherketone film according to claim 2, wherein: The thickness of the film precursor is 100-500 μm.

5. The method for preparing a porous polyaryletherketone film according to claim 2, wherein: In the coagulation bath, the volume ratio of the organic solvent to water is 1:0.1-10.

6. The method for preparing a porous polyaryletherketone film according to claim 2, wherein: The soaking temperature is -5 to 50° C., and the soaking time is 3 to 5 minutes.

7. The method for preparing a porous polyaryletherketone film according to claim 2, wherein: The drying temperature is 20-30° C. and the drying time is 48-60 hours.

8. The method for preparing a porous polyaryletherketone film according to claim 2, wherein: The organic solvent is selected from one or more of N-methylpyrrolidone, N,N-dimethylacetamide and chloroform.

9. The method for preparing a porous polyaryletherketone film according to claim 2, wherein: The substrate is selected from one of a glass plate, a ceramic plate, a polyvinyl chloride plate, a polycarbonate plate, and a stainless steel plate.

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