Polyether-ether-ketone composite membrane as well as preparation method and application thereof

Abstract

The invention provides a polyether-ether-ketone composite membrane as well as a preparation method and application thereof, and belongs to the field of composite materials. The invention provides a polyether-ether-ketone composite membrane. The polyether-ether-ketone composite membrane comprises a coating, a first aramid fiber composite membrane and a second aramid fiber composite membrane, the coating is arranged on the surface of the first aramid fiber composite film; the first aramid fiber composite membrane comprises first polyether-ether-ketone and first deprotonated aramid fiber dispersed in the first polyether-ether-ketone; the second aramid fiber composite film comprises second polyether-ether-ketone, and graphene, multi-walled carbon nanotubes and second deprotonated aramid fibers which are dispersed in the second polyether-ether-ketone; the coating comprises soluble polyaryletherketone and mica sheets and / or boron nitride wrapped by the soluble polyaryletherketone; the coating is of a porous structure. The polyether-ether-ketone composite film disclosed by the invention has excellent radiation cooling performance, solar heating performance and heat-conducting performance.

Description

Technical Field

[0001] The present invention relates to the field of composite materials, and particularly to a polyetheretherketone composite film, a preparation method thereof, and an application thereof. Background Art

[0002] With the continuous increase in people's demand for heating and cooling, non-renewable energy sources such as coal and oil are rapidly consumed, and global greenhouse gas emissions increase year by year. These greenhouse gases will cause irreversible and unpredictable consequences such as rising global temperatures. Therefore, there is an urgent need to develop green and clean energy to provide comfortable living conditions.

[0003] Passive daytime radiative cooling (PDRC), as a technology that does not require additional energy input, has attracted extensive attention from researchers. Its principle is to reduce the absorption rate in the solar light band (i.e., 300 - 2500 nm) and increase the emissivity in the mid-infrared band (i.e., 2.5 - 15 μm), and use the natural cold source of outer space for continuous cooling. In addition, for heating requirements, heat can be absorbed and transmitted through solar energy, a renewable energy source. Therefore, the development and application of dual-functional materials for radiative cooling / solar heating can effectively reduce the negative impact brought by energy consumption. Summary of the Invention

[0004] The present invention provides a polyetheretherketone composite film, a preparation method thereof, and an application thereof. The polyetheretherketone composite film of the present invention has excellent radiative cooling performance, solar heating performance, and thermal conductivity.

[0005] The present invention provides a polyetheretherketone composite film, which includes a coating and a first aramid composite film and a second aramid composite film laminated in sequence; the coating is on the surface of the first aramid composite film;

[0006] The first aramid composite film includes a first polyetheretherketone and first deprotonated aramid fibers dispersed in the first polyetheretherketone;

[0007] The second aramid composite film includes a second polyetheretherketone and graphene, multi-walled carbon nanotubes, and second deprotonated aramid fibers dispersed in the second polyetheretherketone;

[0008] The coating includes soluble polyaryletherketone and mica flakes and / or boron nitride wrapped by the soluble polyaryletherketone; the coating is a porous structure.

[0009] Preferably, the mass ratio of the first polyetheretherketone to the first deprotonated aramid fibers and the mass ratio of the second polyetheretherketone to the second deprotonated aramid fibers are independently 0.5 - 2:1.

[0010] Preferably, the mass ratio of the graphene to the multi-walled carbon nanotubes is 04 - 16:1

[0011] Preferably, the total mass of the graphene and multi-walled carbon nanotubes is 10-30% of the mass of the second aramid composite film.

[0012] Preferably, the total mass of the mica flakes and / or boron nitride is 0-25% of the mass of the coating, and is not 0.

[0013] Preferably, the soluble polyaryletherketone includes one or more of phenolphthalein polyetherketone, biphenyl polyetheretherketone imide, and fluorinated polyetheretherketone.

[0014] The present invention also provides a method for preparing the polyetheretherketone composite film described in the above technical solution, including the following steps:

[0015] (1) Mix the dispersion of the first polyetheretherketone and the first deprotonated aramid fiber and form a film to obtain the first aramid composite film;

[0016] (2) Mix the dispersion of the second polyetheretherketone, graphene, multi-walled carbon nanotubes and the second deprotonated aramid fiber and form a film to obtain the second aramid composite film;

[0017] (3) Stack the first aramid composite film and the second aramid composite film and perform melt hot pressing to form a stacked first aramid composite film and second aramid composite film;

[0018] (4) Electrostatically spray a spraying liquid containing mica flakes and / or boron nitride and soluble polyaryletherketone on the surface of the first aramid composite film, and then dry it to form a coating to obtain the polyetheretherketone composite film;

[0019] There is no order of priority between steps (1) to (2).

[0020] Preferably, the temperature of the melt hot pressing is 340-360 °C, the pressure is 10-20 MPa, and the time is 10-30 min.

[0021] Preferably, the voltage of the electrostatic spraying is 20-50 kV, and the distance between the nozzle used for the electrostatic spraying and the first aramid composite film is 10-30 cm.

[0022] The present invention also provides the application of the polyetheretherketone composite film described in the above technical solution or the polyetheretherketone composite film prepared by the preparation method described in the above technical solution in the fields of construction, automobiles, camping tents, cooling of solar cells or electronic packaging.

[0023] The porous structure of the coating has strong Mie scattering, which can cooperate with boron nitride with a wide band gap, high refractive index and high thermal conductivity, and mica flakes with high reflectivity to scatter sunlight, improving the cooling performance of the composite film; the two fillers (GnPs&MWCNTs) introduced into the second aramid composite film have good sunlight absorption rate and mid-infrared emissivity, can convert solar energy into heat energy, and transfer heat and keep warm for the internal object in combination with the thermal conductivity; the deprotonated aramid fibers and polyether ether ketone in the first aramid composite film can cooperate to enhance the mid-infrared emissivity of the composite film and improve the cooling performance of the composite film. Therefore, the polyether ether ketone composite material provided by the present invention exhibits excellent radiative cooling performance, solar heating performance, thermal conductivity and bidirectional thermal management ability (cooling and heating achieved by flipping the composite film). Description of the Drawings

[0024] Figure 1 It is the ultraviolet-visible-near-infrared reflectivity spectrum of the composite film of Example 1 and the composite film of Comparative Example 1;

[0025] Figure 2 It is the infrared emissivity spectrum of the composite film of Example 1 and the composite film of Comparative Example 1;

[0026] Figure 3 It is the emissivity spectrum of the black surface of the composite film of Example 1;

[0027] Figure 4 It is the test result of the cooling ability of the composite film of Example 1;

[0028] Figure 5 It is the test result of the heating ability of the composite film of Example 1;

[0029] Figure 6 It is the thermal diffusivity and thermal conductivity of the composite film of Example 1 and the composite film of Comparative Example 1;

[0030] Figure 7 It is the reflectivity diagram of the composite films of Examples 1 to 5;

[0031] Figure 8 It is the emissivity diagram of the composite films of Examples 1 to 5;

[0032] Figure 9 It is the emissivity diagram of the composite films of Examples 4, 6 to 8;

[0033] Figure 10 It is the reflectivity diagram of the composite films of Examples 4, 6 to 8. Detailed Description of the Invention

[0034] The present invention provides a polyether ether ketone composite film, which includes a coating and a first aramid composite film and a second aramid composite film stacked in sequence; the coating is on the surface of the first aramid composite film;

[0035] The first aramid composite film includes a first polyether ether ketone and first deprotonated aramid fibers dispersed in the first polyether ether ketone;

[0036] The second aramid composite film includes a second polyether ether ketone, graphene, multi-walled carbon nanotubes, and second deprotonated aramid fibers dispersed in the second polyether ether ketone;

[0037] The coating includes a soluble polyaryletherketone and mica flakes and / or boron nitride encapsulated by the soluble polyaryletherketone; the coating has a porous structure.

[0038] Unless otherwise specified, all raw material components are commercially available products well-known to those skilled in the art.

[0039] The polyether ether ketone composite film provided by the present invention includes a first aramid composite film, and the first aramid composite film includes a first polyether ether ketone and first deprotonated aramid fibers dispersed in the first polyether ether ketone.

[0040] In the present invention, the mass ratio of the first polyether ether ketone to the first deprotonated aramid fibers is preferably 0.5 to 2:1. In specific embodiments of the present invention, the mass ratio of the first polyether ether ketone to the first deprotonated aramid fibers can be 0.5:1, 0.8:1, 1:1, 1.2:1, 1.5:1, 1.8:1, or 2:1. Introducing deprotonated aramid fibers optimizes the forming method of the polyether ether ketone matrix and is conducive to the formation of a multi-layer structure (the stacked first aramid composite film and second aramid composite film).

[0041] The polyether ether ketone composite film provided by the present invention includes a second aramid composite film on the surface of the first aramid composite film, and the second aramid composite film includes a second polyether ether ketone, graphene, multi-walled carbon nanotubes, and second deprotonated aramid fibers dispersed in the second polyether ether ketone.

[0042] In the present invention, the mass ratio of the second polyether ether ketone to the second deprotonated aramid fibers is preferably 0.5 to 2:1. In specific embodiments of the present invention, the mass ratio of the second polyether ether ketone to the second deprotonated aramid fibers can be 0.5:1, 0.8:1, 1:1, 1.2:1, 1.5:1, 1.8:1, or 2:1.

[0043] In the present invention, the total mass of the graphene and multi-walled carbon nanotubes is preferably 10-30% of the mass of the second aramid composite film. In specific embodiments of the present invention, the total mass of the graphene and multi-walled carbon nanotubes can be 10%, 15%, 20%, 25% or 30% of the mass of the second aramid composite film; the mass ratio of the graphene to the multi-walled carbon nanotubes is preferably 0.4-4:1. In specific embodiments of the present invention, the mass ratio of the graphene to the multi-walled carbon nanotubes can be 0.4:1, 1:1, 2:1, 3:1 or 4:1. The graphene and multi-walled carbon nanotubes endow the composite film with good photothermal conversion ability, and promote the heat transfer to the internal object in combination with its heat conduction performance. Introducing deprotonated aramid fibers optimizes the forming method of the polyether ether ketone matrix.

[0044] The polyether ether ketone composite film provided by the present invention includes a coating on the other surface of the first aramid composite film. The coating includes soluble polyaryletherketone and mica flakes and / or boron nitride wrapped by the soluble polyaryletherketone; the coating is a porous structure.

[0045] In the present invention, the total mass of the mica flakes and / or boron nitride is preferably 0-25% of the mass of the polyether ether ketone composite film and is not 0. In specific embodiments of the present invention, the total mass of the mica flakes and / or boron nitride can be 0.1%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22% or 25% of the mass of the polyether ether ketone composite film. In the present invention, when the coating contains mica flakes and boron nitride, the mass of the boron nitride is preferably 70-100% of the total mass of the mica flakes and boron nitride and is not 100%. In specific embodiments of the present invention, the mass of the boron nitride can be 70%, 80%, 90%, 95% or 99% of the total mass of the mica flakes and boron nitride. Using boron nitride with excellent radiation cooling and heat conduction performance as a filler improves the radiation cooling performance and phonon transmission of the polyether ether ketone matrix. The porous structure and mica flakes with a high refractive index enhance the solar light reflectivity of the composite film and improve the cooling performance of the composite film.

[0046] In the present invention, the soluble polyaryletherketone preferably includes one or more of phenolphthalein polyether ketone, biphenyl polyether ether ketone imine and fluorinated polyether ether ketone.

[0047] The present invention also provides a preparation method of the polyether ether ketone composite film described in the above technical solution, including the following steps:

[0048] (1) Mix the dispersion of the first polyether ether ketone and the first deprotonated aramid fiber and then form a film to obtain the first aramid composite film;

[0049] (2) Mix the dispersion of the second polyether ether ketone, graphene, multi-walled carbon nanotubes and the second deprotonated aramid fiber and then form a film to obtain the second aramid composite film;

[0050] (3) Stack the first aramid composite film and the second aramid composite film and then perform melt hot pressing to form a stacked first aramid composite film and second aramid composite film;

[0051] (4) Electrostatically spray a spraying liquid containing mica flakes and / or boron nitride and soluble polyaryletherketone on the surface of the first aramid composite film, and then dry it to form a coating, thereby obtaining the polyetheretherketone composite film;

[0052] There is no order of priority between steps (1) and (2).

[0053] The preparation method of the first aramid composite film is introduced below:

[0054] (1) In the present invention, the first polyetheretherketone is mixed with a dispersion of the first deprotonated aramid fibers and then formed into a film to obtain the first aramid composite film.

[0055] In the present invention, the preparation method of the dispersion of the first deprotonated aramid fibers preferably includes the following steps:

[0056] Dissolve a strong base in water and then mix it with a polar organic solvent and aramid fibers for a neutralization reaction to obtain the dispersion of the first deprotonated aramid fibers.

[0057] In the present invention, the mass ratio of the strong base to water is preferably 3:40; the mass ratio of the strong base to aramid fibers is preferably 3:2; the strong base preferably includes potassium hydroxide.

[0058] In the present invention, the volume ratio of water to the polar organic solvent is preferably 2:50; the polar organic solvent preferably includes dimethyl sulfoxide.

[0059] In the present invention, the time of the neutralization reaction is preferably 1 to 4 h. In specific embodiments of the present invention, the time of the neutralization reaction can be 1 h, 2 h, 3 h or 4 h.

[0060] In the present invention, the film forming preferably includes: mixing the obtained mixture with a poor solvent of aramid fibers and then performing vacuum filtration and drying.

[0061] In the present invention, the poor solvent preferably includes one or more of water, ethanol and acetone.

[0062] In the present invention, the thickness of the first aramid composite film is preferably 80 μm.

[0063] The preparation method of the second aramid composite film is introduced below:

[0064] (2) Mix the second polyetheretherketone, graphene, multi-walled carbon nanotubes and a dispersion of the second deprotonated aramid fibers and then form a film to obtain the second aramid composite film.

[0065] In the present invention, the preparation method of the dispersion of the second deprotonated aramid fiber is preferably the same as that of the dispersion of the first deprotonated aramid fiber.

[0066] In the present invention, the film formation is preferably the same as that in step (1).

[0067] In the present invention, the thickness of the second aramid composite film is preferably 80 μm.

[0068] (3) After obtaining the first aramid composite film and the second aramid composite film, in the present invention, the first aramid composite film and the second aramid composite film are laminated and then melt hot-pressed to form a laminated first aramid composite film and second aramid composite film.

[0069] In the present invention, the temperature of the melt hot-pressing is preferably 340 - 360 °C, the pressure is preferably 10 - 20 MPa, and the time is preferably 10 - 30 min; in a specific embodiment of the present invention, the temperature of the melt hot-pressing can be 340 °C, 345 °C, 350 °C, 355 °C or 360 °C, the pressure can be 10 MPa, 12 MPa, 15 MPa, 18 MPa or 20 MPa, and the time can be 10 min, 15 min, 20 min, 25 min or 30 min.

[0070] (4) After forming the laminated first aramid composite film and second aramid composite film, in the present invention, a spraying solution containing mica flakes and / or boron nitride and soluble polyaryletherketone is electrostatically sprayed on the surface of the first aramid composite film, and then dried to form a coating, thereby obtaining the polyetheretherketone composite film.

[0071] In the present invention, the preparation method of the spraying solution preferably includes the following steps:

[0072] Dissolve the soluble polyaryletherketone in a polar organic solvent and then mix it with mica flakes and / or boron nitride.

[0073] In the present invention, the solid-liquid ratio of the soluble polyaryletherketone to the polar organic solvent is preferably 1 g:500 mL; the polar organic solvent preferably includes dichloromethane.

[0074] In the present invention, the mixing is preferably carried out under ultrasonic conditions, and the mixing time is preferably 1 - 4 h.

[0075] In the present invention, the total concentration of mica and boron nitride in the spraying solution is preferably 5 - 15 mg / mL; in a specific embodiment of the present invention, the total concentration of mica and boron nitride in the spraying solution can be 5 mg / mL, 8 mg / mL, 10 mg / mL, 12 mg / mL or 15 mg / mL.

[0076] In the present invention, the voltage of the electrostatic spraying is preferably 20 - 50 kV. In specific embodiments of the present invention, the voltage can be 20 kV, 30 kV, 40 kV or 50 kV; the distance between the nozzle used for the electrostatic spraying and the first aramid composite film is preferably 10 - 30 cm. In specific embodiments of the present invention, the distance can be 10 cm, 15 cm, 20 cm, 25 cm or 30 cm.

[0077] In the present invention, the filler loading amount is controlled by the mass of the spraying liquid in the electrostatic spraying.

[0078] The present invention also provides the application of the polyetheretherketone composite film described in the above technical solution or the polyetheretherketone composite film prepared by the preparation method described in the above technical solution in the fields of architecture, automobiles, camping tents, cooling of solar cells or electronic packaging.

[0079] The following will combine examples to detail the polyetheretherketone composite film provided by the present invention, its preparation method and application, but they cannot be understood as limiting the protection scope of the present invention.

[0080] Example 1

[0081] The preparation method of the deprotonated aramid nanofiber dispersion liquid is as follows:

[0082] Dissolve 1.5 g of potassium hydroxide in 20 mL of water, add 500 mL of dimethyl sulfoxide and 1 g of aramid fiber, and continuously stir for 2 h until the solution turns wine red to obtain the dispersion liquid of deprotonated aramid fiber.

[0083] The preparation method of the spraying liquid is specifically as follows:

[0084] Add 1 g of phenolphthalein polyetherketone to 500 mL of dichloromethane. After fully dissolving, add 0.3 g of mica flakes and 2.7 g of boron nitride, and ultrasonically disperse for 2 h.

[0085] The preparation method of the MB - GW&ANF / PEEK composite material is as follows:

[0086] Add 1 g of polyetheretherketone powder to the above - mentioned dispersion liquid of deprotonated aramid fiber. After dispersing evenly, discharge it into water, vacuum filter and then dry at 100 °C for 3 h to obtain a light - yellow film with a thickness of 80 μm.

[0087] Add 1 g of polyetheretherketone powder, 0.4 g of graphene and 0.1 g of multi - walled carbon nanotubes to the above - mentioned dispersion liquid of deprotonated aramid fiber. After dispersing evenly, discharge it into water, vacuum filter and then dry at 100 °C for 3 h to obtain a black film with a thickness of 80 μm.

[0088] Place the two films in a mold with an inner diameter of 10×10 cm, and place them in a molding press for hot pressing at a pressure of 20 Mpa and a temperature of 345 °C for 20 min. Finally, remove the pressure and cool to room temperature to obtain the target composite film.

[0089] Perform a spraying operation on the light-colored surface of the composite film. The spraying voltage is 40 kV, and the distance between the spray nozzle and the film is 20 cm. After drying, an MB25-GW10&ANF / PEEK composite film with a content of 25% of radiation cooling fillers (i.e., mica flakes and boron nitride) in the composite film is obtained.

[0090] Example 2

[0091] The specific steps of the preparation methods of the deprotonated aramid nanofibers and the spraying solution are the same as those in Example 1.

[0092] The specific steps of the preparation method of the polyetheretherketone composite film are the same as those in Example 1, except that a certain amount of the spraying solution content is reduced during spraying, and finally an MB20-GW10&ANF / PEEK composite film with a content of 20% of radiation cooling fillers in the composite film is obtained.

[0093] Example 3

[0094] The specific steps of the preparation methods of the deprotonated aramid nanofibers and the spraying solution are the same as those in Example 1.

[0095] The specific steps of the preparation method of the polyetheretherketone composite film are the same as those in Example 1, except that a certain amount of the spraying solution content is reduced during spraying, and finally an MB15-GW10&ANF / PEEK composite film with a content of 15% of radiation cooling fillers in the composite film is obtained.

[0096] Example 4

[0097] The specific steps of the preparation methods of the deprotonated aramid nanofibers and the spraying solution are the same as those in Example 1.

[0098] The specific steps of the preparation method of the polyetheretherketone composite film are the same as those in Example 1, except that a certain amount of the spraying solution content is reduced during spraying, and finally an MB10-GW10&ANF / PEEK composite film with a content of 10% of radiation cooling fillers in the composite film is obtained.

[0099] Example 5

[0100] The specific steps of the preparation methods of the deprotonated aramid nanofibers and the spraying solution are the same as those in Example 1.

[0101] The specific steps of the preparation method of the polyetheretherketone composite membrane are the same as those in Example 1, except that the content of the spraying liquid is reduced during spraying, and finally an MB5-GW10&ANF / PEEK composite membrane with a radiative cooling filler content of 5% is obtained.

[0102] Example 6

[0103] The specific steps of the preparation methods of the deprotonated aramid nanofibers and the spraying liquid are the same as those in Example 1.

[0104] The specific steps of the preparation method of the polyetheretherketone composite membrane are the same as those in Example 4, except that boron nitride is not added.

[0105] Example 7

[0106] The specific steps of the preparation methods of the deprotonated aramid nanofibers and the spraying liquid are the same as those in Example 4.

[0107] The specific steps of the preparation method of the polyetheretherketone composite membrane are the same as those in Example 4, except that the mass ratio of mica flakes to boron nitride is 2:8.

[0108] Example 8

[0109] The specific steps of the preparation methods of the deprotonated aramid nanofibers and the spraying liquid are the same as those in Example 4.

[0110] The specific steps of the preparation method of the polyetheretherketone composite membrane are the same as those in Example 4, except that the mass ratio of mica flakes to boron nitride is 3:7.

[0111] Comparative Example 1

[0112] 1 g of polyetheretherketone, 0.6 g of boron nitride, and 0.07 g of mica are added to the deprotonated aramid nanofiber dispersion in Example 1. After being uniformly dispersed, the mixture is discharged into water, vacuum filtered, and dried at 100 °C for 3 h to obtain an MB&ANF / PEEK composite membrane with a radiative cooling filler content of 25% in the composite membrane.

[0113] Characterization and Performance Testing

[0114] Figure 1 It is the ultraviolet-visible-near-infrared reflectance spectrum of the composite membrane of Example 1 and the composite membrane of Comparative Example 1. After calculation, the average reflectance of the composite membrane of Example 1 is 91.52%, which is higher than 88.63% of Comparative Example 1. Especially in the visible light band where the solar energy is the strongest, the composite membrane of Example 1 exhibits good reflection ability.

[0115] Figure 2The infrared emissivity spectra of the composite film of Example 1 and the composite film of Comparative Example 1 are shown. It can be clearly seen that the composite film of Example 1 has a higher infrared radiation ability than the composite film of Comparative Example 1.

[0116] Figure 3 The emissivity spectrum of the black surface of the composite film of Example 1 (i.e., the surface of the second aramid composite film). In the visible light band, Example 1 has a good ability to absorb sunlight, can generate heat energy through solar energy, and use its infrared radiation ability to transfer heat to surrounding objects.

[0117] Figure 4 The test results of the cooling ability of Example 1. Under outdoor environmental conditions, the MB25-GW10&ANF / PEEK composite film can achieve an average environmental temperature drop of 7.24 °C, indicating that the polyether ether ketone composite film prepared by the method provided by the present invention has good radiative cooling performance.

[0118] Figure 5 The test results of the heating ability of the composite film of Example 1. Under outdoor environmental conditions, the MB25-GW10&ANF / PEEK composite film can achieve an average environmental temperature rise of 10.46 °C, indicating that the polyether ether ketone composite film prepared by the method provided by the present invention has good photothermal conversion performance.

[0119] Figure 6 The thermal diffusivity of the composite film of Example 1 and the composite film of Comparative Example 1 (the thermal diffusivity of the composite film of Example 1 is 9.47 mm 2 ·s -1 ) and the thermal conductivity (the thermal diffusivity of the composite film of Example 1 is 3.58 W·m -1 ·K -1 ). It can be seen that Example 1 has excellent thermal conductivity, far higher than that of Comparative Example 1.

[0120] Figure 7 The reflectivity diagrams of the composite films of Examples 1 to 5.

[0121] Figure 8 The emissivity diagrams of the composite films of Examples 1 to 5.

[0122] Figure 9 The emissivity diagrams of the composite films of Examples 4, 6 to 8.

[0123] Figure 10 The reflectivity diagrams of the composite films of Examples 4, 6 to 8. Among them, Figures 9 - 10 10 / 0 is the composite film of Example 6, 9 / 1 is the composite film of Example 4, 8 / 2 is the composite film of Example 7, and 7 / 3 is the composite film of Example 8.

[0124] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A polyetheretherketone composite membrane, characterized in that, It includes a coating and a first aramid composite film and a second aramid composite film laminated in sequence; the coating is on the surface of the first aramid composite film; The first aramid composite film includes a first polyether ether ketone and first deprotonated aramid fibers dispersed in the first polyether ether ketone; The second aramid composite film includes a second polyether ether ketone and graphene, multi-walled carbon nanotubes and second deprotonated aramid fibers dispersed in the second polyether ether ketone; The coating includes a soluble polyaryletherketone and mica flakes and / or boron nitride wrapped by the soluble polyaryletherketone; the coating is a porous structure.

2. The polyether ether ketone composite film according to claim 1, wherein The mass ratio of the first polyether ether ketone to the first deprotonated aramid fibers and the mass ratio of the second polyether ether ketone to the second deprotonated aramid fibers are independently 0.5-2:

1.

3. The polyether ether ketone composite membrane according to claim 1, wherein The mass ratio of the graphene to the multi-walled carbon nanotubes is 0.4-4:

1.

4. The polyether ether ketone composite film according to claim 1 or 3, wherein The total mass of the graphene and the multi-walled carbon nanotubes is 10-30% of the mass of the second aramid composite film.

5. The polyetheretherketone composite film according to claim 1, characterized in that, The total mass of the mica flakes and / or boron nitride is 0-25% of the mass of the polyether ether ketone composite film and is not 0.

6. The polyether ether ketone composite film according to claim 1, wherein The soluble polyaryletherketone includes one or more of a phenolphthalein type polyaryletherketone, a biphenyl type polyaryletherketone imine and a fluorinated polyaryletherketone.

7. The preparation method of the polyether ether ketone composite film according to any one of claims 1 to 6, characterized in that, It includes the following steps: (1) Mix the dispersion of the first polyether ether ketone and the first deprotonated aramid fibers and then form a film to obtain the first aramid composite film; (2) Mix the dispersion of the second polyether ether ketone, graphene, multi-walled carbon nanotubes and the second deprotonated aramid fibers and then form a film to obtain the second aramid composite film; (3) Stack the first aramid composite film and the second aramid composite film and then perform melt hot pressing to form a stacked first aramid composite film and second aramid composite film; (4) Electrostatically spray a spraying solution containing mica flakes and / or boron nitride and a soluble polyaryletherketone on the surface of the first aramid composite film, and then dry it to form a coating to obtain the polyether ether ketone composite film; There is no order of priority for the steps (1)-(2).

8. The preparation method according to claim 7, characterized in that, The temperature of the melt hot pressing is 340-360 °C, the pressure is 10-20 MPa, and the time is 10-30 min.

9. The preparation method according to claim 7, characterized in that, The voltage of the electrostatic spraying is 20-50 kV, and the distance between the nozzle used for the electrostatic spraying and the first aramid composite film is 10-30 cm.

10. Application of the polyether ether ketone composite film according to any one of claims 1-6 or the polyether ether ketone composite film prepared by the preparation method according to any one of claims 7-9 in the fields of construction, automobiles, camping tents, cooling of solar cells or electronic packaging.

Images