Preparation process and application of a polyimide nanofiber membrane

Abstract

The present invention relates to the technical field of functional modification of polyimide nanofiber membranes, and discloses a preparation process and application of a polyimide nanofiber membrane. The polyimide nanofiber membrane is prepared by an electrospinning method. During the coating process of the polyimide nanofiber membrane, a novel organic-inorganic hybrid antistatic component is prepared and dispersed in absolute ethanol to obtain an organic-inorganic hybrid antistatic component dispersion liquid. The polyimide nanofiber membrane is first surface-treated with polydopamine and then immersed in the organic-inorganic hybrid antistatic component dispersion liquid to prepare a polyimide nanofiber membrane with antistatic function. The polyimide nanofiber membrane with antistatic function prepared by the present invention has excellent antistatic performance and can be applied in functional clothing such as protective clothing, cold-proof clothing, and knitted clothing.

Description

Technical Field

[0001] The present invention relates to the technical field of functional modification of polyimide nanofiber membranes, and particularly to a preparation process and application of polyimide nanofiber membranes. Background Art

[0002] Polyimide fibers have excellent properties such as high and low temperature resistance, flame retardancy, heat insulation, and antibacterial properties, and have good spinnability. They are ideal materials for manufacturing various functional clothing (for example, protective clothing, cold-proof clothing, knitted clothing), and are the high-performance fibers most suitable for large-scale promotion in the clothing field.

[0003] Due to the large molecular polarity, small surface tension, poor water absorption, and relatively high surface resistivity (10 15 -10 20 Ω) of polyimide, the antistatic performance of polyimide nanofiber membranes is poor, and static electricity accumulation is likely to occur during the use of their textile products, which may further cause problems such as static electric shock, dust adsorption, and combustion. Therefore, it is particularly necessary to perform antistatic treatment on polyimide nanofiber membranes.

[0004] Currently, the main methods for antistatic treatment of polyimide nanofiber membranes include adding antistatic agents, surface coating, and adding conductive fillers, etc. Among them, surface coating has become one of the important means for antistatic modification of fiber membranes due to its characteristics such as simple operation, strong adjustability, and the ability to retain the original properties of the fiber membrane.

[0005] The present invention cites the following references:

[0006] The master's degree thesis "Synthesis and Preparation of Functional Group Cage-like Oligomeric Silsesquioxanes" published by Chen Chao of Hubei University in 2011 disclosed the synthesis method and chemical structure of divinylchloropropylpentapropylcage-like silsesquioxane [Si8O 12 (CH=CH2)2(C3H6Cl)(C3H7)5](POSS2);

[0007] The present application uses divinylchloropropylpentapropylcage-like silsesquioxane as a raw material when preparing methacrylate-based tetracarboxylated antistatic functional monomers. Summary of the Invention

[0008] The present invention uses electrospinning to prepare polyimide fiber membranes, and uses a newly developed organic-inorganic hybrid antistatic component to perform antistatic modification on the polyimide fiber membranes, and prepares a polyimide nanofiber membrane product with antistatic function, which can be applied in functional clothing such as protective clothing, cold-proof clothing, and knitted clothing.

[0009] To achieve the above object, the present invention adopts the following technical solution: A preparation process of a polyimide nanofiber membrane, comprising the following steps:

[0010] Step 1: Prepare a polyimide nanofiber membrane by electrospinning method;

[0011] Step 2: Based on the acylation reaction mechanism, under the action of an activator and a catalyst, carbon nanotubes modified with silane coupling agent KH550 react with a carboxylated antistatic block copolymer to prepare an organic-inorganic hybrid antistatic component. Disperse the organic-inorganic hybrid antistatic component in absolute ethanol to obtain an organic-inorganic hybrid antistatic component dispersion;

[0012] Among them, the preparation method of the carboxylated antistatic block copolymer is: Polymerization monomers ethylene glycol mono vinyl ether and methacrylate group tetracarboxylated antistatic functional monomer undergo atom transfer radical polymerization under the joint action of ethyl 2-bromoisobutyrate and cuprous bromide;

[0013] Step 3: First, treat the surface of the polyimide nanofiber membrane with polydopamine, then immerse it in the organic-inorganic hybrid antistatic component dispersion, take it out and dry it to prepare a polyimide nanofiber membrane with antistatic function.

[0014] Furthermore, the preparation process of the polyimide nanofiber membrane is as follows:

[0015] Dissolve 4,4'-diaminodiphenyl ether in N,N-dimethylformamide, protect it by passing nitrogen, stir mechanically until completely dissolved, then add pyromellitic dianhydride in three equal batches to the solution in turn, and continuously stir and react for 5-7h to prepare a polyamic acid solution;

[0016] Load the prepared polyamic acid solution into a syringe and use electrospinning technology to prepare an initial polyimide nanofiber membrane;

[0017] Place the initial polyimide nanofiber membrane in a muffle furnace for gradient heating to undergo thermal imidization reaction to obtain a polyimide nanofiber membrane.

[0018] Furthermore, the parameters of the electrospinning machine are set as: voltage 15-25kV, spinning distance 10-20cm, feeding speed 0.5-2mL / h, roller speed 50-150rpm, temperature 20-30°C, relative humidity 35-45%.

[0019] Furthermore, the preparation process of the methacrylate group tetracarboxylated antistatic functional monomer is as follows:

[0020] Under the irradiation of a photoinitiator and an ultraviolet lamp, an "ene-thiol" click chemical reaction occurs between the alkenyl functional groups in the structure of divinylchloropropyl pentapropylcage silsesquioxane and the thiol groups in the structure of 2-mercaptosuccinic acid, generating a polycarboxylated chloropropyl pentapropylcage silsesquioxane monomer;

[0021] Using the nucleophilic substitution mechanism, a quaternization reaction occurs between the chloro-functional groups in the structure of the polycarboxylated chloropropyl pentapropylcage silsesquioxane monomer and the tertiary amine groups in the structure of dimethylaminoethyl methacrylate, generating a methacrylate-based tetra-carboxylated antistatic functional monomer, and the molar ratio of the polycarboxylated chloropropyl pentapropylcage silsesquioxane monomer to dimethylaminoethyl methacrylate is 1:(1.00 - 1.04).

[0022] Furthermore, the photoinitiator is one of dimethoxybenzene, ethoxybenzene or isopropoxybenzene.

[0023] Furthermore, the activator is one of 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, N,N'-dicyclohexylcarbodiimide or N,N'-diisopropylcarbodiimide.

[0024] Furthermore, the catalyst is one of N-hydroxysuccinimide, 4-dimethylaminopyridine or 1-hydroxybenzotriazole.

[0025] Furthermore, the preparation process of the carbon nanotubes modified with silane coupling agent KH550 is as follows:

[0026] First, the carbon nanotubes are pretreated with a mixed acid to obtain mixed acid-oxidized carbon nanotubes, and then the mixed acid-oxidized carbon nanotubes are modified with silane coupling agent KH550 to prepare the carbon nanotubes modified with silane coupling agent KH550.

[0027] Furthermore, the preparation process of the polydopamine solution is as follows: an ammonia water solution is added to a mixed solution of ethanol and distilled water, and after mixing, dopamine hydrochloride is added, and the mixture is stirred at room temperature for 10 - 15 h to obtain a polydopamine solution;

[0028] The preparation process of the organic-inorganic hybrid antistatic component dispersion is as follows: the organic-inorganic hybrid antistatic component is ultrasonically dispersed in ethanol to form a uniform dispersion, obtaining the organic-inorganic hybrid antistatic component dispersion.

[0029] The application of a polyimide nanofiber membrane prepared according to the above process in functional clothing such as protective clothing, cold-proof clothing, knitted clothing, etc.

[0030] The beneficial effects of the present invention are as follows:

[0031] The present invention designs and synthesizes a novel carboxylated antistatic block copolymer, uses the carboxylated antistatic block copolymer to modify the surface of carbon nanotubes, and prepares an organic-inorganic hybrid antistatic component; then, the organic-inorganic hybrid antistatic component is made into a dispersion and coated on the surface of a polyimide nanofiber membrane prepared by an electrospinning process to prepare a polyimide nanofiber membrane with antistatic function;

[0032] It is found through experiments that: compared with ordinary polyimide nanofiber membranes, the polyimide nanofiber membrane with antistatic function prepared by the present invention has excellent antistatic performance and can be applied in the textile field. Detailed implementation mode

[0033] In order to avoid the aggregation of carbon nanotubes in ethanol, the present invention independently develops a carboxylated antistatic block copolymer, uses it to modify the surface of carbon nanotubes, enables them to be uniformly dispersed in ethanol, and thus can be uniformly distributed on the surface of the fiber membrane, achieving the technical goal of organic-inorganic synergistic antistatic and endowing the polyimide nanofiber membrane with excellent antistatic performance.

[0034] Example 1:

[0035] Prepare a carboxylated antistatic block copolymer, including the following steps:

[0036] (1) Prepare a multi-carboxylated chloropropyl pentapropyl silsesquioxane monomer. Its preparation mechanism is: under the irradiation of a photoinitiator and an ultraviolet lamp, through the "thiol-ene" click chemical reaction between the alkenyl functional group in the divinyl chloropropyl pentapropyl silsesquioxane structure and the thiol group in the 2-mercaptobutanedioic acid structure, a multi-carboxylated chloropropyl pentapropyl silsesquioxane monomer is prepared. The specific experimental steps are as follows: Add 0.77 g of divinyl chloropropyl pentapropyl silsesquioxane, 1.02 g of 2-mercaptobutanedioic acid, and 20 mL of tetrahydrofuran to a 100 mL single-necked flask, stir and mix evenly, add 0.036 g of dimethoxybenzyl, stir and react for 1 h under the irradiation of an ultraviolet lamp (UV 365 nm). During the reaction, cover the reaction device with a dark cloth to prevent ultraviolet light from leaking. After the reaction, remove tetrahydrofuran by rotation, and then use a mixture of dichloromethane and petroleum ether with a volume ratio of 1:10 as the mobile phase and 300-mesh silica gel as the stationary phase for column chromatography separation. Place the product in a vacuum drying oven at 60 °C and dry to constant weight to obtain a multi-carboxylated chloropropyl pentapropyl silsesquioxane monomer;

[0037] (2)Prepare a methacrylate-based tetracarboxylated antistatic functional monomer. The preparation mechanism is as follows: Using the nucleophilic substitution mechanism, a quaternization reaction occurs between the chlorine functional group in the structure of the polycarboxylated chloropropyl pentapropyl cage-like silsesquioxane monomer and the tertiary amine group in the structure of dimethylaminoethyl methacrylate to prepare the methacrylate-based tetracarboxylated antistatic functional monomer. And the molar ratio of the polycarboxylated chloropropyl pentapropyl cage-like silsesquioxane monomer to dimethylaminoethyl methacrylate is 1:1. The specific experimental steps are as follows: Add 8 g of the polycarboxylated chloropropyl pentapropyl cage-like silsesquioxane monomer and chloroform to a reactor under nitrogen protection, stir evenly mechanically, then add 1.05 g of dimethylaminoethyl methacrylate. After adding, raise the temperature of the system to 40 °C, stir and react for 12 h. After cooling to room temperature, rotary evaporate to remove the solvent, wash, and vacuum dry at 80 °C for 8 h to prepare the methacrylate-based tetracarboxylated antistatic functional monomer. Its chemical structural formula is:

[0038] ;

[0039] The 1H NMR characterization of the methacrylate-based tetracarboxylated antistatic functional monomer is as follows:

[0040] 1 H NMR(CDCl3, 400 MHz) δ: 0.58 - 0.61 (t, 10H), 0.81 - 0.84 (t, 2H), 0.86 - 0.95 (m, 19H), 1.40 - 1.48 (m, 10H), 1.77 - 1.84 (m, 2H), 1.92 (s, 3H), 2.71 - 2.75 (t, 4H), 2.80 - 2.95 (m, 4H), 3.19 (s, 6H), 3.52 - 3.56 (t, 2H), 3.79 - 3.87 (m, 2H), 4.04 - 4.07 (t, 2H), 4.39 - 4.41 (t, 2H), 5.72 - 5.81 (d, 2H);

[0041] (3)Prepare a carboxylated antistatic block copolymer. The preparation mechanism is as follows: Using ethylene glycol mono vinyl ether and methacrylate group tetra-carboxylated antistatic functional monomer as raw materials, ethyl 2-bromoisobutyrate as the initiator, copper bromide as the catalyst, and N,N,N’,N’’,N’’-pentamethyldiethylenetriamine as the ligand, a carboxylated antistatic block copolymer was synthesized by ATRP (atom transfer radical polymerization). The specific experimental steps are as follows: Under nitrogen protection, 0.38 g of N,N,N’,N’’,N’’-pentamethyldiethylenetriamine, 0.14 g of ethyl 2-bromoisobutyrate, 5 g of ethylene glycol mono vinyl ether, 17.31 g of methacrylate group tetra-carboxylated antistatic functional monomer, and 0.11 g of copper bromide were added to a four-necked round bottom flask equipped with a magnetic stirring rotor, a condenser, a thermometer, and a nitrogen protection device. 50 mL of N,N-dimethylformamide was added, and the reaction mixture was degassed with high-purity nitrogen for 1 h. Then the temperature was raised to 130 °C, and the mixture was refluxed for 9 h. After cooling to room temperature, it was filtered, washed, and placed in a vacuum dryer at 40 °C for 12 h to obtain the carboxylated antistatic block copolymer.

[0042] Example 2:

[0043] Based on Example 1, prepare an organic-inorganic hybrid antistatic component, including the following steps:

[0044] Step 1: Prepare carbon nanotubes modified with silane coupling agent KH550. The preparation mechanism is as follows: First, use a mixed acid to pretreat the carbon nanotubes to obtain mixed acid-oxidized carbon nanotubes, and then use the silane coupling agent KH550 to modify the mixed acid-oxidized carbon nanotubes to prepare carbon nanotubes modified with silane coupling agent KH550. The specific experimental steps are as follows: Place 1 g of carbon nanotubes in 100 mL of mixed acid (the volume ratio of concentrated sulfuric acid to concentrated nitric acid is 3:1), ultrasonically disperse for 1 h, stir and reflux in an 80 °C oil bath for 6 h. After cooling to room temperature, centrifuge and wash it at high speed (9000 r / min, 10 min, wash alternately with anhydrous ethanol / distilled water 3 times), and then vacuum dry at 80 °C for 5 h to obtain mixed acid-oxidized carbon nanotubes;

[0045] Add 0.1 g of mixed acid-oxidized carbon nanotubes to 100 mL of distilled water, ultrasonically disperse for 45 min, add 6 mL of an aqueous solution containing 0.001 g of silane coupling agent KH550, keep the temperature in an oil bath at 75 °C, heat and reflux for 6 h, filter the product, wash it, and vacuum dry at 80 °C for 5 h to obtain carbon nanotubes modified with silane coupling agent KH550;

[0046] Step 2: Prepare an organic-inorganic hybrid antistatic component. The preparation mechanism is as follows: Under the action of 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and N-hydroxysuccinimide, an acylation reaction occurs between the amino groups in the carbon nanotubes modified by the silane coupling agent KH550 and the carboxyl groups in the carboxylated antistatic block copolymer to prepare the organic-inorganic hybrid antistatic component. The specific experimental steps are as follows: Add 1 g of antistatic block copolymer and 200 mL of deionized water to a conical flask, ultrasonicate for 1 h, then add 0.096 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and 0.039 g of N-hydroxysuccinimide, ultrasonicate for 2 h, then add 1.4 g of carbon nanotubes modified by the silane coupling agent KH550, stir and react in an ice bath for 24 h, filter, wash, and vacuum dry at 60 °C for 24 h to prepare the organic-inorganic hybrid antistatic component.

[0047] Example 3:

[0048] The main raw materials used in the present invention are as follows:

[0049] The carbon nanotubes are purchased from Guangzhou Hongwu Material Technology Co., Ltd., and their specifications are: diameter 10 - 30 nm, length 1 - 2 μm;

[0050] Prepare a polyimide nanofiber membrane with antistatic function, including the following steps:

[0051] Dissolve 1.2 g of 4,4'-diaminodiphenyl ether in 12.2 mL of N,N-dimethylformamide, protect it by introducing nitrogen, and mechanically stir until completely dissolved. Then add 1.321 g of pyromellitic dianhydride in three batches successively to the solution (with an interval of 30 min between each batch), and continuously stir and react for 6 h to prepare a polyamic acid solution with a solid content of 18 wt%;

[0052] Load the prepared polyamic acid solution with a solid content of 18 wt% into a 20 mL syringe, and use electrospinning technology to prepare an initial polyimide nanofiber membrane. The parameters of the electrospinning machine are set as follows: voltage 20 kV, spinning distance 20 cm, inner diameter of the spinning needle 0.41 mm, feeding speed 1.5 mL / h, roller rotation speed 100 rpm, use a copper mesh (100 mesh) to cover the roller as the collecting device, temperature 25 °C, relative humidity 40%;

[0053] The electrospinning machine is purchased from Shanghai Dongxiang Nanotechnology Co., Ltd., and the model is DXES-1;

[0054] Place the initial polyimide nanofiber membrane in a muffle furnace, perform gradient heating, and continuously maintain it at 80 °C, 100 °C, 200 °C, and 300 °C for 1 h to undergo thermal imidization reaction, and then obtain the polyimide nanofiber membrane after natural cooling;

[0055] 0.4 mL of 30 wt% ammonia aqueous solution was added to a mixed solution of 100 mL of ethanol and distilled water (the volume ratio of ethanol to distilled water was 3:7). After mixing evenly, 0.2 g of dopamine hydrochloride was added, and the mixture was stirred at room temperature for 12 h to obtain a polydopamine solution; 10 g of an organic-inorganic hybrid antistatic component was ultrasonically dispersed in 100 mL of ethanol to form a homogeneous dispersion, obtaining an organic-inorganic hybrid antistatic component dispersion;

[0056] The polyimide nanofiber membrane was washed 3 times with acetone and distilled water in sequence, and then immersed in the prepared polydopamine solution. After standing for 12 h, the polydopamine-coated polyimide nanofiber membrane was placed in a vacuum oven at 60 °C and dried for 30 min. Then the fiber membrane was taken out and immersed in the organic-inorganic hybrid antistatic component dispersion. After mechanical stirring for 5 h, the fiber membrane was vacuum dried at 60 °C for 4 h to prepare a polyimide nanofiber membrane with antistatic function;

[0057] The application experiment of the polyimide nanofiber membrane with antistatic function was as follows:

[0058] Using the polyimide nanofiber membrane with antistatic function as the core barrier layer and woven fabric as the inner and outer layers, a protective clothing fabric in the form of a "sandwich" structure was prepared by compounding.

[0059] Comparative Example 1:

[0060] A polyimide nanofiber membrane, which was different from Example 3 in that: the surface of the polyimide nanofiber membrane was not coated with the polydopamine solution and the organic-inorganic hybrid antistatic component dispersion, and the others were the same as in Example 3.

[0061] Performance test:

[0062] According to GB / T 31838.2-2019 "Solid insulating materials - Dielectric and resistive properties - Part 2: Resistive properties (DC method) - Volume resistance and volume resistivity", the surface resistivity of the polyimide nanofiber membrane with antistatic function prepared in Example 3 and the polyimide nanofiber membrane in Comparative Example 1 was measured using a ZC36 type high resistance meter at a temperature of 23 °C and a relative humidity of 50%. The test voltage was set to 500 V. Before the test, the fiber membrane was placed in an environment of 23 °C and a relative humidity of 50% for 24 h. The specific test results are shown in Table 1;

[0063]

[0064] From the data in Table 1, it can be concluded that compared with the membrane product prepared in Comparative Example 1, the surface resistivity of the polyimide nanofiber membrane with antistatic function prepared in Example 3 of the present invention is reduced to 3.67×10 6 Ω, reaching the optimal requirement range for antistatic (10 6 -10 9 ). From this, it can be known that coating the surface of the polyimide nanofiber membrane with an organic-inorganic hybrid antistatic component can significantly improve the antistatic performance of the polyimide nanofiber membrane.

Claims

1. A preparation process of a polyimide nanofiber membrane, characterized in that It includes the following steps: Step 1: Prepare a polyimide nanofiber membrane by electrospinning method; Step 2: Based on the acylation reaction mechanism, under the action of an activator and a catalyst, carbon nanotubes modified with silane coupling agent KH550 react with a carboxylated antistatic block copolymer to prepare an organic-inorganic hybrid antistatic component. Disperse the organic-inorganic hybrid antistatic component in absolute ethanol to obtain an organic-inorganic hybrid antistatic component dispersion; Among them, the preparation method of the carboxylated antistatic block copolymer is: Polymerization monomers ethylene glycol mono vinyl ether and methacrylate group tetracarboxylated antistatic functional monomer undergo atom transfer radical polymerization under the joint action of ethyl 2-bromoisobutyrate and cuprous bromide; Step 3: First, treat the surface of the polyimide nanofiber membrane with polydopamine, then immerse it in the organic-inorganic hybrid antistatic component dispersion, take it out and dry it to prepare a polyimide nanofiber membrane with antistatic function; The chemical structural formula of the methacrylate group tetracarboxylated antistatic functional monomer is: 。 2. The preparation process of a polyimide nanofiber membrane according to claim 1, characterized in that, The preparation process of the polyimide nanofiber membrane is: Dissolve 4,4'-diaminodiphenyl ether in N,N-dimethylformamide, protect it by passing nitrogen, stir mechanically until completely dissolved, then add pyromellitic dianhydride in three equal batches to the solution in turn, and continuously stir and react for 5-7 h to prepare a polyamic acid solution; Load the prepared polyamic acid solution into a syringe and use electrospinning technology to prepare an initial polyimide nanofiber membrane; Place the initial polyimide nanofiber membrane in a muffle furnace for gradient heating to undergo thermal imidization reaction to obtain a polyimide nanofiber membrane.

3. The preparation process of a polyimide nanofiber membrane according to claim 2, characterized in that, The parameter settings of the electrospinning technology used in the preparation of the initial polyimide nanofiber membrane are: voltage 15-25 kV, spinning distance 10-20 cm, feeding speed 0.5-2 mL / h, roller rotation speed 50-150 rpm, temperature 20-30 °C, relative humidity 35-45%.

4. The preparation process of a polyimide nanofiber membrane according to claim 1, characterized in that, The preparation process of the methacrylate group tetracarboxylated antistatic functional monomer is: Under the irradiation of a photoinitiator and an ultraviolet lamp, through the "thiol-ene" click chemical reaction of the alkenyl functional group in the structure of divinyl chloropropyl pentapropyl cage-like silsesquioxane and the thiol group in the structure of 2-mercaptosuccinic acid, a polycarboxylated chloropropyl pentapropyl cage-like silsesquioxane monomer is generated; Using the nucleophilic substitution mechanism, through the quaternization reaction of the chlorine functional group in the structure of the polycarboxylated chloropropyl pentapropyl cage-like silsesquioxane monomer and the tertiary amine group in the structure of dimethylaminoethyl methacrylate, a methacrylate group tetracarboxylated antistatic functional monomer is generated, and the molar ratio of the polycarboxylated chloropropyl pentapropyl cage-like silsesquioxane monomer to dimethylaminoethyl methacrylate is 1:(1.00-1.04).

5. The preparation process of a polyimide nanofiber membrane according to claim 4, characterized in that, The photoinitiator is one of benzoin dimethyl ether, benzoin ethyl ether or benzoin isopropyl ether.

6. The preparation process of a polyimide nanofiber membrane according to claim 1, characterized in that, The activator is one of 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, N,N-dicyclohexylcarbodiimide or N,N'-diisopropylcarbodiimide.

7. The preparation process of a polyimide nanofiber membrane according to claim 1, characterized in that, The catalyst is one of N-hydroxysuccinimide, 4-dimethylaminopyridine or 1-hydroxybenzotriazole.

8. The preparation process of a polyimide nanofiber membrane according to claim 1, characterized in that, The preparation process of the carbon nanotubes modified by the silane coupling agent KH550 is as follows: First, the carbon nanotubes are pretreated with a mixed acid to obtain carbon nanotubes oxidized by the mixed acid, and then the carbon nanotubes oxidized by the mixed acid are modified with the silane coupling agent KH550 to prepare the carbon nanotubes modified by the silane coupling agent KH550.

9. The preparation process of a polyimide nanofiber membrane according to claim 1, characterized in that, The polydopamine in step 3 is a polydopamine solution, and its preparation process is: adding an ammonia water solution into a mixed solution of ethanol and distilled water, mixing evenly, adding dopamine hydrochloride, and stirring at room temperature for 10-15 h to obtain a polydopamine solution; The preparation process of the organic-inorganic hybrid antistatic component dispersion is: ultrasonically dispersing the organic-inorganic hybrid antistatic component in ethanol to form a uniform dispersion, and obtaining the organic-inorganic hybrid antistatic component dispersion.

10. Application of a polyimide nanofiber membrane prepared by the process according to any one of claims 1-9 in a functional garment, which is one of a protective garment, a cold-proof garment and a knitted garment.

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