Nanometer hydrophobic fiber material and preparation method thereof

Abstract

The invention discloses a nano hydrophobic fiber material and a preparation method thereof, and relates to the technical field of nano fiber materials. The preparation method comprises the following steps: firstly, activating and modifying a carbon nanotube, then mixing with camphene, a silicon dioxide precursor and bromo-phenyltrimethoxysilane, and by utilizing polypropylene as a matrix, grafting camphene molecules on the carbon nanotube, so that holes with a nano structure can be formed on the surface of the fiber, and the hydrophobic property of the fiber is realized; meanwhile, bromo-phenyltrimethoxysilane is also grafted with the carbon nano tubes, movement of a polymer chain segment is reduced by bromo-phenyltrimethoxysilane and nano-silica, so that the mechanical performance of a matrix is enhanced, long-acting hydrophobic performance is achieved, finally, uniform volatilization of camphene is promoted by adjusting the drying rate, polypropylene forms small crystals in the matrix through the carbon nano tubes, and the mechanical property of the matrix is improved. Therefore, the long-acting hydrophobic performance of the fiber is further enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of nanofiber materials, in particular to a nano hydrophobic fiber material and a preparation method thereof. Background Art

[0002] The unique properties of superhydrophobic surfaces in nature have greatly inspired us, such as the self-cleaning function of lotus leaves and new water transportation vehicles. By leveraging their water-resistant properties, the application range of superhydrophobic surfaces has been continuously expanded, including: self-cleaning, corrosion resistance, drag reduction on water surface motion, anti-freezing and anti-fog, and oil-water separation. Furthermore, with the rapid development of fields such as environment, energy, electronics, optics, and medicine, the demand for nanoscale composite fiber materials is also increasing. The emergence of nanotechnology has further broadened the scope of fiber material research. The nanometer-scale diameter of nanofibers leads to ultra-high specific surface area and high porosity, which greatly improves the performance of fiber materials. Summary of the Invention

[0003] The purpose of the present invention is to provide a nano hydrophobic fiber material and a preparation method thereof to solve the problems existing in the prior art.

[0004] In order to solve the above technical problems, the present invention provides the following technical solution: a method for preparing a nano hydrophobic fiber material, comprising the following preparation steps: (1) The carbon nanotubes were treated with discharge plasma, and then placed in an acid solution at a bath ratio of 1:20, heated to 100 ° C, stirred at 100-200 rpm and reacted for 3-6 hours, then washed with deionized water until the pH of the washing solution was 7-8, and finally washed with ethanol 3-6 times, and dried at 50-90 ° C and a vacuum degree of 0.2-1 kPa for 24 hours to obtain modified carbon nanotubes; (2) Bromoisobutyric acid, ferrous bromide, N,N,N',N'',N''-pentamethyldiethylenetriamine, and N,N-dimethylacetamide were mixed in a mass ratio of 0.5-1:0.3-0.8:0.5:100, and 0.3-0.8 times the mass of N,N-dimethylacetamide was added to bromophenyltrimethoxysilane under a nitrogen atmosphere. The mixture was frozen at -20°C and thawed three times. The mixture was then stirred at 100-200°C in a water bath at 60-80°C for 6-10 hours. The product was finally precipitated three times with anhydrous petroleum ether to remove unreacted monomers. The mixture was then dried at 50-90°C and a vacuum degree of 0.2-1 kPa for 24 hours to obtain intermediate A. (3) The modified carbon nanotubes and chloroform were mixed, ultrasonicated at 21kHz for 10-30min, camphene and intermediate A were added, the temperature was raised to 50°C, and stirred at 60-160rpm for 20-30h, and then dried at 40°C under a vacuum of 0.2-1kPa for 24h to obtain intermediate B; (4) Intermediate B and N,N-dimethylformamide were mixed and ultrasonicated at 21kHz for 5-15min. Then, deionized water was added dropwise at 0.1-1mL / s while stirring at 500rpm. The mixture was reacted for 1.5-3h. Ethylenediamine was added and stirring was continued for 8-12 days. Finally, the solid was filtered and dried at 40℃ and vacuum degree of 0.2-1kPa for 40h to obtain intermediate C. (5) Mix the intermediate C and N,N-dimethylformamide, ultrasonicate at 21kHz for 20-45min, add ethyl orthosilicate and deionized water, stir at 100-200rpm for 3-6h, add triethylamine, continue stirring for 10 days, filter, and collect the solid to obtain the prepolymer; (6) The prepolymer, polypropylene, and N,N-dimethylformamide are mixed, heated to 40°C, stirred at 100-200 rpm for 100-160 min, and then spun and dried to obtain a nano-hydrophobic fiber material.

[0005] Furthermore, the process parameters of the plasma treatment in step (1) are: vacuum degree of 6 Pa, temperature of 1200-1600° C., and holding time of 5-15 min.

[0006] Furthermore, the acid solution in step (1) is composed of concentrated nitric acid and concentrated sulfuric acid in a volume ratio of 1:3.

[0007] Furthermore, the mass ratio of the modified carbon nanotubes, chloroform, camphene, and intermediate A in step (3) is 0.2:10-30:0.2:0.1.

[0008] Furthermore, in step (4), the mass ratio of the intermediate B, N,N-dimethylformamide, deionized water, and ethylenediamine is 0.1:5:5.5:0.1.

[0009] Furthermore, in step (5), the mass ratio of the intermediate C, N,N-dimethylformamide, ethyl orthosilicate, deionized water, and triethylamine is 0.1:100:2:100:30.

[0010] Furthermore, the polypropylene in step (6) is specifically polypropylene-91500.

[0011] Furthermore, in step (6), the mass ratio of the prepolymer, polypropylene, and N,N-dimethylformamide is 5-15:3-7:5-15.

[0012] Furthermore, the spinning process parameters of step (6) are: receiving distance of 10-22 cm, voltage of 24 kV, and rate of 0.5-1.5 mL / h.

[0013] Furthermore, the drying step (6) specifically comprises the following steps: heating to 80-130°C at a rate of 0.5°C / min, keeping the temperature for 2 hours, then heating to 400-700°C, and keeping the temperature for 2 hours.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention first activates and modifies carbon nanotubes, thereby forming a multi-walled structure on the tube body and realizing carboxylation, thereby enhancing the dispersibility of the carbon nanotubes in a matrix material, then mixing with amphene, a silicon dioxide precursor, and bromophenyltrimethoxysilane, and utilizing polypropylene as a matrix, wherein the methyl groups on the amphene react with part of the carboxyl groups on the carbon nanotubes, thereby grafting occurs, and the amphene molecules are also uniformly dispersed in the matrix, thereby in a subsequent drying process, the amphene and water molecules volatilize, forming nanostructured holes on the fiber surface, and forming an air cushion, resulting in the adsorption force between the fiber and the droplet being less than that between the needle tip and the liquid. The adsorption force of the droplets prevents the droplets from falling on the surface, thereby achieving the hydrophobic property of the fiber. At the same time, bromophenyltrimethoxysilane is also grafted with the carboxyl groups on the carbon nanotubes, thereby capturing the free silica precursor, thereby reducing the movement of the matrix polymer chain segments, enhancing its hardness characteristics while improving the friction resistance of the fiber surface and achieving long-term hydrophobicity. At the same time, the addition of camphene and bromophenyltrimethoxysilane can enhance the conductivity of the spinning solution, which is beneficial to the preparation of nanofibers. Finally, by adjusting the drying rate, the uniform volatilization of camphene is promoted, and the carbon nanotubes are used to form smaller crystals of polypropylene inside the matrix, thereby further improving the long-term hydrophobic property of the fiber. DETAILED DESCRIPTION

[0015] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] In order to more clearly illustrate the method provided by the present invention, the following examples are used to describe in detail the test methods of various indicators of the nano hydrophobic fiber materials prepared in the following examples. Hydrophobicity: The same size of the embodiment and the comparative example were tested using a contact measuring instrument with a 2 μL water droplet; after friction treatment, the contact angle was measured again.

[0017] Example 1; (1) Carbon nanotubes were subjected to discharge plasma treatment, with the following process parameters: vacuum degree of 6 Pa, temperature of 1200°C, and holding time of 5 min, and then placed in an acid solution at a bath ratio of 1:20, heated to 100°C, stirred at 100 rpm and reacted for 3 h, then washed with deionized water until the pH of the washing solution was 7, and finally washed with ethanol three times, and dried at 50°C and vacuum degree of 0.2 kPa for 24 h to obtain modified carbon nanotubes; the acid solution was composed of concentrated nitric acid and concentrated sulfuric acid in a volume ratio of 1:3; (2) Bromoisobutyric acid, ferrous bromide, N,N,N',N'',N''-pentamethyldiethylenetriamine, and N,N-dimethylacetamide were mixed in a mass ratio of 0.5:0.3:0.5:100, and 0.3 times the mass of N,N-dimethylacetamide was added to bromophenyltrimethoxysilane under a nitrogen atmosphere. The mixture was frozen at -20°C and thawed three times, and then stirred at 100°C for 6 hours in a 60°C water bath. Finally, the product was precipitated three times with anhydrous petroleum ether, and the unreacted monomer was removed. The mixture was dried at 50°C and a vacuum degree of 0.2 kPa for 24 hours to obtain intermediate A. (3) The modified carbon nanotubes and chloroform were mixed, ultrasonicated at 21kHz for 10min, camphene and intermediate A were added, the temperature was raised to 50°C, stirred at 60rpm for 20h, and then dried at 40°C and a vacuum degree of 0.2kPa for 24h to obtain intermediate B; the mass ratio of the modified carbon nanotubes, chloroform, camphene, and intermediate A was 0.2:10:0.2:0.1; (4) Intermediate B and N,N-dimethylformamide were mixed, ultrasonicated at 21kHz for 5 minutes, and then deionized water was added dropwise at 0.1mL / s while stirring at 500rpm. The mixture was reacted for 1.5 hours, and ethylenediamine was added. The mixture was stirred for 8 days, and finally filtered. The solid was taken and dried at 40℃ and 0.2kPa vacuum for 40 hours to obtain intermediate C. The mass ratio of intermediate B, N,N-dimethylformamide, deionized water, and ethylenediamine was 0.1:5:5.5:0.1. (5) The intermediate C and N,N-dimethylformamide were mixed, ultrasonicated at 21kHz for 20min, ethyl orthosilicate and deionized water were added, stirred at 100rpm for 3h, triethylamine was added, and stirring was continued for 10 days. The mixture was filtered and the solid was collected to obtain a prepolymer; the mass ratio of the intermediate C, N,N-dimethylformamide, ethyl orthosilicate, deionized water, and triethylamine was 0.1:100:2:100:30; (6) The prepolymer, polypropylene-91500, and N,N-dimethylformamide were mixed, heated to 40°C, stirred at 100 rpm for 100 min, and then spun. The process parameters were: receiving distance of 10 cm, voltage of 24 kV, and rate of 0.5 mL / h. Finally, the mixture was dried, heated to 80°C at 0.5°C / min, kept warm for 2 h, and then heated to 400°C and kept warm for 2 h to obtain a nano-hydrophobic fiber material. The mass ratio of the prepolymer, polypropylene-91500, and N,N-dimethylformamide was 5:3:5.

[0018] Example 2; (1) The carbon nanotubes were subjected to discharge plasma treatment, with the following process parameters: vacuum degree of 6 Pa, temperature of 1400 ° C, and holding time of 10 min, and then placed in an acid solution with a bath ratio of 1:20, heated to 100 ° C, stirred at 150 rpm and reacted for 4 h, and then washed with deionized water until the pH of the washing solution was 7.5, and finally washed with ethanol 5 times, and dried at 70 ° C and vacuum degree of 0.6 kPa for 24 h to obtain modified carbon nanotubes; the acid solution was composed of concentrated nitric acid and concentrated sulfuric acid in a volume ratio of 1:3; (2) Bromoisobutyric acid, ferrous bromide, N,N,N',N'',N''-pentamethyldiethylenetriamine, and N,N-dimethylacetamide were mixed in a mass ratio of 0.75:0.5:0.5:100. Under a nitrogen atmosphere, 0.5 times the mass of N,N-dimethylacetamide was added to bromophenyltrimethoxysilane. The mixture was frozen at -20°C and thawed three times. The mixture was then stirred at 150°C for 8 h in a 70°C water bath. The product was finally precipitated three times with anhydrous petroleum ether to remove unreacted monomers. The mixture was dried at 70°C and a vacuum degree of 0.6 kPa for 24 h to obtain intermediate A. (3) The modified carbon nanotubes and chloroform were mixed, ultrasonicated at 21kHz for 20min, camphene and intermediate A were added, the temperature was raised to 50°C, stirred at 110rpm for 25h, and then dried at 40°C and a vacuum degree of 0.6kPa for 24h to obtain intermediate B; the mass ratio of the modified carbon nanotubes, chloroform, camphene, and intermediate A was 0.2:20:0.2:0.1; (4) Intermediate B and N,N-dimethylformamide were mixed, ultrasonicated at 21kHz for 10 minutes, and then deionized water was added dropwise at 0.6mL / s while stirring at 500rpm. The mixture was reacted for 2 hours, and ethylenediamine was added. The mixture was stirred for 10 days, and finally filtered. The solid was taken and dried at 40℃ and 0.6kPa vacuum for 40 hours to obtain intermediate C. The mass ratio of intermediate B, N,N-dimethylformamide, deionized water, and ethylenediamine was 0.1:5:5.5:0.1. (5) Mix the intermediate C and N,N-dimethylformamide, ultrasonicate at 21kHz for 33 minutes, add ethyl orthosilicate and deionized water, stir at 150rpm for 4 hours, add triethylamine, continue stirring for 10 days, filter, and collect the solid to obtain a prepolymer; the mass ratio of the intermediate C, N,N-dimethylformamide, ethyl orthosilicate, deionized water, and triethylamine is 0.1:100:2:100:30; (6) The prepolymer, polypropylene-91500, and N,N-dimethylformamide were mixed, heated to 40°C, stirred at 150 rpm for 130 min, and then spun. The process parameters were: receiving distance of 15 cm, voltage of 24 kV, and rate of 1 mL / h. Finally, the mixture was dried, heated to 105°C at 0.5°C / min, kept warm for 2 h, and then heated to 550°C and kept warm for 2 h to obtain a nano-hydrophobic fiber material. The mass ratio of the prepolymer, polypropylene-91500, and N,N-dimethylformamide was 10:5:10.

[0019] Example 3; (1) The carbon nanotubes were subjected to discharge plasma treatment, with the following process parameters: vacuum degree of 6 Pa, temperature of 1600 ° C, and holding time of 15 min, and then placed in an acid solution with a bath ratio of 1:20, heated to 100 ° C, stirred at 200 rpm and reacted for 6 h, and then washed with deionized water until the pH of the washing solution was 8, and finally washed with ethanol 6 times, and dried at 90 ° C and vacuum degree of 1 kPa for 24 h to obtain modified carbon nanotubes; the acid solution was composed of concentrated nitric acid and concentrated sulfuric acid in a volume ratio of 1:3; (2) Bromoisobutyric acid, ferrous bromide, N,N,N',N'',N''-pentamethyldiethylenetriamine, and N,N-dimethylacetamide were mixed in a mass ratio of 1:0.8:0.5:100. Under a nitrogen atmosphere, 0.8 times the mass of N,N-dimethylacetamide of bromophenyltrimethoxysilane was added. The mixture was frozen at -20°C and thawed three times. The mixture was then stirred at 200°C for 10 hours in an 80°C water bath. The product was finally precipitated three times with anhydrous petroleum ether to remove unreacted monomers. The mixture was dried at 90°C and a vacuum degree of 1 kPa for 24 hours to obtain intermediate A. (3) The modified carbon nanotubes and chloroform were mixed, ultrasonicated at 21kHz for 30min, camphene and intermediate A were added, the temperature was raised to 50°C, stirred at 160rpm for 30h, and then dried at 40°C and a vacuum degree of 1kPa for 24h to obtain intermediate B; the mass ratio of the modified carbon nanotubes, chloroform, camphene, and intermediate A was 0.2:30:0.2:0.1; (4) Intermediate B and N,N-dimethylformamide were mixed, ultrasonicated at 21kHz for 15min, and then stirred at 500rpm while adding deionized water at 1mL / s. The mixture was reacted for 3h, and ethylenediamine was added. The mixture was stirred for 12 days, and finally filtered. The solid was taken and dried at 40℃ and 1kPa vacuum for 40h to obtain intermediate C. The mass ratio of intermediate B, N,N-dimethylformamide, deionized water, and ethylenediamine was 0.1:5:5.5:0.1. (5) The intermediate C and N,N-dimethylformamide were mixed, ultrasonicated at 21kHz for 45min, ethyl orthosilicate and deionized water were added, stirred at 200rpm for 6h, triethylamine was added, and stirring was continued for 10 days. The mixture was filtered and the solid was collected to obtain a prepolymer; the mass ratio of the intermediate C, N,N-dimethylformamide, ethyl orthosilicate, deionized water, and triethylamine was 0.1:100:2:100:30; (6) The prepolymer, polypropylene-91500, and N,N-dimethylformamide were mixed, heated to 40°C, stirred at 200 rpm for 160 min, and then spun. The process parameters were: receiving distance of 22 cm, voltage of 24 kV, and rate of 1.5 mL / h. Finally, the spinning process was carried out, and the temperature was raised to 130°C at 0.5°C / min, kept warm for 2 h, and then heated to 700°C and kept warm for 2 h to obtain a nano-hydrophobic fiber material; the mass ratio of the prepolymer, polypropylene-91500, and N,N-dimethylformamide was 15:7:15.

[0020] Comparative Example 1; The difference between Comparative Example 1 and Example 2 is that step (1) is omitted, and step (3) is changed to: carbon nanotubes and chloroform are mixed, ultrasonicated at 21kHz for 20min, camphene and intermediate A are added, the temperature is raised to 50°C, stirred at 110rpm for 25h, and then dried at 40°C and a vacuum degree of 0.6kPa for 24h to obtain intermediate B; the mass ratio of the carbon nanotubes, chloroform, camphene, and intermediate A is 0.2:20:0.2:0.1; the remaining steps are the same as in Example 2.

[0021] Comparative Example 2: The difference between Comparative Example 2 and Example 2 is that step (3) is different. Step (3) is changed to: the modified carbon nanotubes and chloroform are mixed, ultrasonicated at 21kHz for 20min, intermediate A is added, the temperature is raised to 50°C, stirred at 110rpm for 25h, and then dried at 40°C and a vacuum degree of 0.6kPa for 24h to obtain intermediate B; the mass ratio of the modified carbon nanotubes, chloroform and intermediate A is 0.2:20:0.1; the remaining steps are the same as in Example 2.

[0022] Comparative Example 3; The difference between Comparative Example 3 and Example 2 is that step (5) is omitted, and step (6) is changed to: intermediate C, polypropylene-91500, and N,N-dimethylformamide are mixed, heated to 40°C, stirred at 150rpm for 130min, and then spun. The process parameters are: receiving distance of 15cm, voltage of 24kV, and rate of 1mL / h. Finally, drying treatment is carried out, heating to 105°C at 0.5°C / min, keeping warm for 2h, and then heating to 550°C and keeping warm for 2h to obtain a nano-hydrophobic fiber material; the mass ratio of the intermediate C, polypropylene-91500, and N,N-dimethylformamide is 10:5:10; the remaining steps are the same as Example 2.

[0023] Comparative Example 4; The difference between Comparative Example 4 and Example 2 is that (6) is different. Step (6) is changed to: mixing the prepolymer, polypropylene-91500, and N,N-dimethylformamide, heating to 40°C, stirring at 150rpm for 130min, and then spinning. The process parameters are: receiving distance of 15cm, voltage of 24kV, rate of 1mL / h, and finally drying treatment at a temperature of 80°C for 5h to obtain a nano-hydrophobic fiber material; the mass ratio of the prepolymer, polypropylene-91500, and N,N-dimethylformamide is 10:5:10; the remaining steps are the same as Example 2.

[0024] Effect Examples Table 1 below shows the performance analysis results of the nano hydrophobic fiber materials of Examples 1 to 3 of the present invention and Comparative Examples 1 to 4.

[0025] Table 1

[0026] From the comparison of the experimental data of the embodiment and the comparative example in Table 1, it can be found that the present invention first activates and modifies the carbon nanotubes, and chemically crosslinks and coats them through their organic functional groups and high-molecular weight molecules. The organic functional groups can break the hydrophilic groups and most of the lipophilic groups in all plastic molecules, thereby increasing the volume flow rate of the plastic matrix and providing internal and external lubrication through a ball effect. The nanoparticles act as nucleating agents and plasticizers. Only a small amount of any rheological additive is needed during use to make the hydrophobic system smoother, combining with the hydrophilic groups in the resin to coat and temper it. A permanent hydrophobic effect can be achieved; then, it is mixed with camphene, a silica precursor, and bromophenyltrimethoxysilane, and polypropylene is used as a matrix. Nanostructured pores are formed on the fiber surface through camphene, and an air cushion is formed, forming a generalized lotus leaf effect. At the same time, bromophenyltrimethoxysilane is also cross-linked with carbon nanotubes, thereby enhancing the mechanical properties of the matrix and achieving long-term hydrophobicity. Finally, by adjusting the drying rate, the uniform volatilization of camphene is promoted, and the carbon nanotubes are used to form smaller crystals of polypropylene inside the matrix, thereby further enhancing the long-term hydrophobicity.

[0027] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed therein. Any reference in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A method for preparing a nano hydrophobic fiber material, characterized in that: The method comprises the following preparation steps: (1) The carbon nanotubes were treated with discharge plasma, and then placed in an acid solution at a bath ratio of 1:20, heated to 100 ° C, stirred at 100-200 rpm and reacted for 3-6 hours, then washed with deionized water until the pH of the washing solution was 7-8, and finally washed with ethanol 3-6 times, and dried at 50-90 ° C and a vacuum degree of 0.2-1 kPa for 24 hours to obtain modified carbon nanotubes; (2) Bromoisobutyric acid, ferrous bromide, N,N,N',N'',N''-pentamethyldiethylenetriamine, and N,N-dimethylacetamide were mixed in a mass ratio of 0.5-1:0.3-0.8:0.5:100, and 0.3-0.8 times the mass of N,N-dimethylacetamide was added to bromophenyltrimethoxysilane under a nitrogen atmosphere. The mixture was frozen at -20°C and thawed three times. The mixture was then stirred at 100-200°C in a water bath at 60-80°C for 6-10 hours. The product was finally precipitated three times with anhydrous petroleum ether to remove unreacted monomers. The mixture was then dried at 50-90°C and a vacuum degree of 0.2-1 kPa for 24 hours to obtain intermediate A. (3) The modified carbon nanotubes and chloroform were mixed, ultrasonicated at 21kHz for 10-30min, camphene and intermediate A were added, the temperature was raised to 50°C, and stirred at 60-160rpm for 20-30h, and then dried at 40°C under a vacuum of 0.2-1kPa for 24h to obtain intermediate B; (4) Intermediate B and N,N-dimethylformamide were mixed and ultrasonicated at 21kHz for 5-15min. Then, deionized water was added dropwise at 0.1-1mL / s while stirring at 500rpm. The mixture was reacted for 1.5-3h. Ethylenediamine was added and stirring was continued for 8-12 days. Finally, the solid was filtered and dried at 40℃ and vacuum degree of 0.2-1kPa for 40h to obtain intermediate C. (5) Mix the intermediate C and N,N-dimethylformamide, ultrasonicate at 21kHz for 20-45min, add ethyl orthosilicate and deionized water, stir at 100-200rpm for 3-6h, add triethylamine, continue stirring for 10 days, filter, and collect the solid to obtain the prepolymer; (6) The prepolymer, polypropylene, and N,N-dimethylformamide are mixed, heated to 40°C, stirred at 100-200 rpm for 100-160 min, and then spun and dried to obtain a nano-hydrophobic fiber material.

2. The method for preparing a nano hydrophobic fiber material according to claim 1, characterized in that: The process parameters of the plasma treatment in step (1) are as follows: vacuum degree of 6 Pa, temperature of 1200-1600° C., and holding time of 5-15 min.

3. The method for preparing a nano hydrophobic fiber material according to claim 1, characterized in that: The acid solution in step (1) is composed of concentrated nitric acid and concentrated sulfuric acid in a volume ratio of 1:

3.

4. The method for preparing a nano hydrophobic fiber material according to claim 1, characterized in that: The mass ratio of the modified carbon nanotubes, chloroform, camphene, and intermediate A in step (3) is 0.2:10-30:0.2:0.

1.

5. The method for preparing a nano hydrophobic fiber material according to claim 1, characterized in that: The mass ratio of the intermediate B, N,N-dimethylformamide, deionized water, and ethylenediamine in step (4) is 0.1:5:5.5:0.

1.

6. The method for preparing a nano hydrophobic fiber material according to claim 1, characterized in that: The mass ratio of the intermediate C, N,N-dimethylformamide, ethyl orthosilicate, deionized water, and triethylamine in step (5) is 0.1:100:2:100:

30.

7. The method for preparing a nano hydrophobic fiber material according to claim 1, characterized in that: The polypropylene in step (6) is specifically polypropylene-91500.

8. The method for preparing a nano hydrophobic fiber material according to claim 1, characterized in that: The mass ratio of the prepolymer, polypropylene and N,N-dimethylformamide in step (6) is 5~15:3~7:5~15.

9. The method for preparing a nano hydrophobic fiber material according to claim 1, characterized in that: The spinning process parameters of step (6) are as follows: receiving distance of 10-22 cm, voltage of 24 kV, and rate of 0.5-1.5 mL / h.

10. The method for preparing a nano hydrophobic fiber material according to claim 1, characterized in that: The specific steps of drying in step (6) are as follows: heating to 80-130°C at 0.5°C / min, keeping warm for 2 hours, then heating to 400-700°C, and keeping warm for 2 hours.

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