Carbon nanomaterial-loaded fiber and method for preparing the same

Abstract

The application provides a carbon nanomaterial loaded fiber and a preparation method thereof. The preparation method comprises the following steps: mixing carbon nanomaterial, a dispersing agent and a solvent to perform dispersion, to obtain a carbon nanometer dispersion liquid; loading the carbon nanometer dispersion liquid on the surface of a fiber to obtain a carbon nanometer dispersion liquid loaded fiber; and performing coagulation bath treatment on the carbon nanometer dispersion liquid loaded fiber, and drying, to obtain the carbon nanomaterial loaded fiber. The loading method of the carbon nanomaterial is simple, efficient and low in cost, and a complex dispersion liquid formula is not required. The carbon nanomaterial loaded fiber has high purity, does not contain other auxiliary additives except the carbon nanomaterial and the fiber, and has strong coating force and good stability.

Description

Technical Field

[0001] This invention belongs to the field of composite material technology, and relates to a carbon nanomaterial supported fiber, and more particularly to a carbon nanomaterial supported fiber and its preparation method. Background Technology

[0002] Fiber materials, such as glass fiber, possess excellent mechanical properties, chemical stability, and special functionalities, and are widely used in aerospace, industry, and medical fields. With continuous technological advancements, the demand for functionalizing fibers is also increasing, especially in endowing them with new functional properties, such as electrical and thermal conductivity, while maintaining their traditional advantages of being lightweight, high-strength, heat-resistant, and corrosion-resistant, to further broaden their application areas.

[0003] To achieve this goal, researchers have tried to coat the fiber surface with a metal coating through chemical plating, sputtering and other methods. Although this method can indeed give the fiber electrical conductivity, the problems that come with it cannot be ignored. For example, the introduction of metal materials not only greatly increases the density of the material, but also weakens its corrosion resistance to a certain extent, which undoubtedly limits its application in more fields.

[0004] To overcome these limitations, researchers have turned to carbon nanomaterials, such as carbon nanotubes (CNTs) and graphene. These carbon nanomaterials, due to their excellent electrical and thermal conductivity and chemical stability, have become an ideal solution. They can impart electrical and thermal conductivity to fibers without compromising their original properties, thus greatly expanding the application range of fibers.

[0005] Currently, various methods exist for loading carbon nanomaterials onto fiber surfaces, such as chemical vapor deposition (CVD), spraying, or coating. For example, CN108330679A discloses a method for preparing graphene-coated conductive fibers, which involves reducing graphene oxide to form a graphene hydrosol, and then uniformly coating the fibers using an impregnation-coating method. CN108774879A, CN111808314A, and other disclosures of graphene-loaded fiber materials achieve graphene loading onto the fibers by forming opposite charges between the loaded material and the fiber, followed by impregnation, and then through electrostatic self-assembly. CN109267325A discloses a method for preparing uniformly dispersed graphene / nanomaterial coated fibers, which involves first mechanically stirring and then performing ice-water bath cell pulverization to obtain uniformly dispersed graphene oxide, followed by impregnation. In the existing methods for loading carbon materials with fibers, on the one hand, relying solely on coating or impregnation and drying results in insufficient interfacial bonding between the carbon and the fiber. On the other hand, enhancing the interfacial bonding often depends on the formulation of the carbon nanotube solution and the addition of auxiliary additives such as ionic groups, which involves complex processes and can negatively impact the purity of the composite material.

[0006] Therefore, based on the shortcomings of existing technologies, this invention provides a carbon nanomaterial-supported fiber and its preparation method. Summary of the Invention

[0007] The purpose of this invention is to provide a carbon nanomaterial-supported fiber and its preparation method. The preparation method is simple, efficient, and low-cost. The resulting carbon nanomaterial-supported fiber does not contain any other auxiliary additives and has excellent electrical conductivity.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a method for preparing carbon nanomaterial-supported fibers, the method comprising the following steps:

[0010] (1) Carbon nanomaterials, dispersant and solvent are mixed and dispersed to obtain carbon nanomaterial dispersion;

[0011] (2) Load the carbon nanoparticle dispersion onto the fiber surface to obtain carbon nanoparticle dispersion-loaded fiber;

[0012] (3) The carbon nanomaterials loaded with the dispersion were subjected to coagulation bath treatment and dried to obtain the carbon nanomaterials loaded with the fibers.

[0013] The preparation method provided by this invention involves preparing a dispersion of carbon nanomaterials and combining a two-step process of loading and coagulation bath to load the carbon nanomaterials onto fiber materials. During the loading process, the dispersion of carbon nanomaterials uniformly coats the fiber surface. Then, in the coagulation bath, the dispersant is dissolved by utilizing the difference in solubility between the dispersion system and the coagulation system, resulting in strong interactions between the carbon nanomaterials and ensuring that the carbon nanomaterials are completely and firmly coated on the fiber surface. The preparation method provided by this invention is simple, efficient, and low-cost, requiring no complex dispersion formulation. The dispersant used is removed in the coagulation bath, and the resulting carbon nanomaterial-loaded fibers have high purity, containing no other auxiliary additives besides the carbon nanomaterials and fibers. Furthermore, the loaded fibers exhibit strong coating force and good stability.

[0014] Preferably, the carbon nanomaterial in step (1) includes any one or a combination of at least two of carbon nanotubes, carbon black, graphene, graphene oxide, or nanographite sheets. Typical but non-limiting combinations include combinations of carbon nanotubes and carbon black, carbon black and graphene, graphene and graphene oxide, graphene oxide and nanographite sheets, carbon nanotubes, carbon black and graphene, carbon black, graphene and graphene oxide, or carbon nanotubes, carbon black, graphene and graphene oxide.

[0015] Preferably, the carbon nanotubes include single-walled carbon nanotubes and / or multi-walled carbon nanotubes.

[0016] Preferably, the median length of the carbon nanotube is 0.1-1000 μm, for example, it can be 0.1 μm, 0.5 μm, 1 μm, 5 μm, 10 μm, 30 μm, 50 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm or 1000 μm, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable. Preferably, it is 1-800 μm, and more preferably, it is 10-500 μm.

[0017] Preferably, the graphene or graphene oxide sheet diameter is 0.1-2000 μm, for example, it can be 0.1 μm, 0.5 μm, 1 μm, 5 μm, 10 μm, 30 μm, 50 μm, 80 μm, 100 μm, 120 μm, 150 μm, 180 μm, 200 μm, 400 μm, 500 μm, 600 μm, 800 μm, 1000 μm, 1200 μm, 1500 μm, 1800 μm or 2000 μm, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable. Preferably, it is 1-1000 μm, and more preferably 5-200 μm.

[0018] Preferably, the dispersant in step (1) includes ionic surfactants and / or nonionic surfactants.

[0019] Preferably, the dispersant in step (1) comprises any one or a combination of at least two of the following: alkylaryl phosphate, alkylbenzene sulfonate, dialkyl sulfosuccinate, polyoxyethylene alkylphenol ether, sorbitol alkylate, polycarboxylate, polymethacrylic acid derivative, maleic anhydride copolymer quaternary ammonium salt, pyridinium hydrochloride, or phosphate ester salt. Typical but non-limiting combinations include combinations of alkylaryl phosphate and alkylbenzene sulfonate, dialkyl sulfosuccinate and polyoxyethylene alkylphenol ether, sorbitol alkylate and polycarboxylate, polymethacrylic acid derivative and maleic anhydride copolymer quaternary ammonium salt, or pyridinium hydrochloride and phosphate ester salt.

[0020] Preferably, the mass ratio of the dispersant to the carbon nanomaterial in step (1) is (0.1-10):1, for example, it can be 0.1:1, 0.2:1, 0.5:1, 1:1, 1.5:1, 2:1, 2.5:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1 or 10:1, preferably (0.2-5):1, and more preferably (0.5-3):1.

[0021] Preferably, the dispersion method in step (1) includes any one or a combination of at least two of stirring, ultrasonication, homogenization, sand milling or emulsification. Typical but non-limiting combinations include a combination of stirring and ultrasonication, a combination of ultrasonication and homogenization, a combination of homogenization and sand milling, a combination of sand milling and emulsification, a combination of stirring, ultrasonication and homogenization, or a combination of homogenization, sand milling and emulsification.

[0022] Preferably, the concentration of carbon nanomaterials in the carbon nano-dispersion in step (1) is 0.1-50 g / L, for example, it can be 0.1 g / L, 0.2 g / L, 0.5 g / L, 1 g / L, 5 g / L, 15 g / L, 20 g / L, 25 g / L, 30 g / L, 35 g / L, 40 g / L, 45 g / L or 50 g / L, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable. Preferably, it is 0.5-20 g / L, and more preferably 1-10 g / L.

[0023] Preferably, the surface tension of the carbon nanoparticle dispersion in step (1) is 21-52 mN / m, for example, it can be 21 mN / m, 25 mN / m, 30 mN / m, 35 mN / m, 40 mN / m, 45 mN / m, 50 mN / m or 52 mN / m, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0024] Preferably, the viscosity of the carbon nanoparticle dispersion in step (1) is 10-10000 mPa·s, for example, it can be 10 mPa·s, 50 mPa·s, 100 mPa·s, 500 mPa·s, 1000 mPa·s, 1500 mPa·s, 2000 mPa·s, 2500 mPa·s, 3000 mPa·s, 3500 mPa·s, 4000 mPa·s, 4500 mPa·s, 5000 mPa·s, 6000 mPa·s, 7000 mPa·s, 8000 mPa·s, 9000 mPa·s or 10000 mPa·s, preferably 100-5000 mPa·s.

[0025] Preferably, the fibers in step (2) include organic fibers and / or inorganic fibers.

[0026] Preferably, the organic fiber includes any one or a combination of at least two of the following: polyester, acrylic, nylon, polypropylene, aramid, polyethylene fiber, poly(p-phenylenebenzobisoxazole) fiber (PBO fiber), poly(p-phenylenebenzoimidazolium) fiber (PBI fiber), poly(p-phenylenepyridinium diimidazolium) fiber (M5 fiber), or polyimide fiber (PI fiber).

[0027] Preferably, the inorganic fiber includes any one or a combination of at least two of glass fiber, quartz fiber, basalt fiber, ceramic fiber, alumina fiber, aluminum silicate fiber, mullite fiber or silicon carbide fiber.

[0028] Preferably, the fiber includes any one or a combination of at least two of the following: fiber monofilament, fiber bundle, unidirectional fiber fabric, nonwoven fiber fabric, or woven fiber fabric.

[0029] Preferably, the woven fabric comprises, but is not limited to, any one or a combination of at least two of the following: plain weave, twill weave, or satin weave.

[0030] Preferably, the loading method in step (2) includes any one or a combination of at least two of dipping, spraying or spin coating. Typical but non-limiting combinations include a combination of dipping and spraying, a combination of spraying and spin coating, a combination of dipping and spin coating, or a combination of dipping, spraying and spin coating.

[0031] Preferably, the loading time in step (2) is ≥10s, for example, it can be 10s, 20s, 30s, 1min, 2min, 3min, 4min, 5min, 6min, 8min, 10min, 15min, 20min or 30min, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable. Preferably, it is ≥1min, and more preferably ≥2min.

[0032] Preferably, the medium of the coagulation bath in step (3) includes any one or a combination of at least two of alcohols, ketones, ethers, esters, or aqueous solutions. Typical but non-limiting combinations include combinations of alcohols and ketones, ketones and ethers, ethers and esters, esters and aqueous solutions, alcohols, ketones and ethers, or ethers, esters and aqueous solutions.

[0033] Preferably, the medium of the coagulation bath in step (3) includes any one or a combination of at least two of butanol, pentanol, ethanol, polyethylene glycol, acetone, ethylene glycol butyl ether, ethyl acetate, sodium sulfate aqueous solution, or deionized water. Typical but non-limiting combinations include combinations of butanol and pentanol, ethanol and polyethylene glycol, polyethylene glycol and acetone, ethylene glycol butyl ether and ethyl acetate, ethyl acetate and sodium sulfate aqueous solution, pentanol, ethanol and polyethylene glycol, or acetone, ethylene glycol butyl ether, ethyl acetate and sodium sulfate aqueous solution.

[0034] Preferably, the coagulation bath time in step (3) is ≥30s, for example, it can be 30s, 1min, 2min, 3min, 4min, 5min, 6min, 7min, 8min, 9min, 10min, 12min, 14min, 15min, 16min, 18min, 20min, 22min, 24min, 25min, 26min, 28min or 30min, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable. Preferably, it is ≥2min, and more preferably ≥4min.

[0035] In a second aspect, the present invention provides a carbon nanomaterial-supported fiber, which is prepared by the preparation method described in the first aspect.

[0036] Preferably, the sheet resistance of the carbon nanomaterial-loaded fiber is 0.5-5000 Ω / □, for example, it can be 0.5 Ω / □, 1 Ω / □, 5 Ω / □, 10 Ω / □, 50 Ω / □, 100 Ω / □, 300 Ω / □, 500 Ω / □, 800 Ω / □, 1000 Ω / □, 1200 Ω / □, 1500 Ω / □, 2000 Ω / □, 2500 Ω / □, 3000 Ω / □, 3500 Ω / □, 4000 Ω / □, 4500 Ω / □ or 5000 Ω / □, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The carbon nanomaterial loading method provided by this invention is simple, efficient, and low-cost. It does not require a complex dispersion formulation, and the resulting carbon nanomaterial loaded with fibers has high purity. In addition to the carbon nanomaterial and fibers, it does not contain any other auxiliary additives, and the loaded fibers have strong encapsulation force and good stability. Attached Figure Description

[0039] Figure 1 This is a scanning electron microscope image of the glass fiber in Example 6;

[0040] Figure 2 This is a scanning electron microscope image of the carbon nanomaterial-supported fibers provided in Example 6. Detailed Implementation

[0041] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0042] Example 1

[0043] This embodiment provides a method for preparing carbon nanomaterial-supported fibers, the method comprising the following steps:

[0044] (1) Add 0.3g of polyvinylpyrrolidone and 0.1g of single-walled carbon nanotubes to 100mL of water. The median length of the single-walled carbon nanotubes is 20μm. The mixture is ultrasonically dispersed for 30min to obtain a single-walled carbon nanotube dispersion. The concentration of carbon nanomaterials in the dispersion is 1g / L, the viscosity of the dispersion is 740mPa·s, and the surface tension of the system is 35mN / m. Then, immerse the glass fiber plain weave cloth in the obtained dispersion for 10min. The carbon nanotubes are loaded onto the surface of the glass fiber cloth to obtain a glass fiber cloth loaded with the dispersion.

[0045] (2) The obtained loaded glass fiber cloth was placed in an ethanol coagulation bath for 5 minutes, then removed and dried to obtain the carbon nanomaterial loaded fiber.

[0046] Example 2

[0047] This embodiment provides a method for preparing carbon nanomaterial-supported fibers, the method comprising the following steps:

[0048] (1) Add 0.1g of polyvinylpyrrolidone and 1g of graphene to 100mL of water. The median sheet diameter of the graphene is 2000μm. Process it in a high-pressure homogenizer at 200bar for 20min to obtain a graphene dispersion. The concentration of carbon nanomaterials in the dispersion is 50g / L, the viscosity of the dispersion is 9986mPa·s, and the surface tension of the dispersion is 48mN / m. Then, aramid fiber bundles are immersed in the dispersion for 30s. Graphene is loaded onto the surface of aramid fibers to obtain aramid fiber bundles loaded with dispersion.

[0049] (2) The obtained loaded aramid fiber bundles were placed in an acetone coagulation bath for 30 seconds, then removed and dried to obtain the carbon nanomaterial loaded fibers.

[0050] In this embodiment, the obtained carbon nanomaterials are loaded with fibers and woven into plain weave fabric.

[0051] Example 3

[0052] This embodiment provides a method for preparing carbon nanomaterial-supported fibers. Compared with Example 1, the soaking time in step (1) is controlled to be 30s, and the rest are the same as in Example 1.

[0053] Example 4

[0054] This embodiment provides a method for preparing carbon nanomaterial-supported fibers. Compared with Example 1, the solidification time of step (2) is controlled to be 2 min, and the rest are the same as in Example 1.

[0055] Example 5

[0056] This embodiment provides a method for preparing carbon nanomaterial-supported fibers. Compared with Example 1, the concentration of carbon nanomaterial in the dispersion in step (1) is 0.1 g / L, and the rest is the same as in Example 1.

[0057] Example 6

[0058] This embodiment provides a method for preparing carbon nanomaterial-supported fibers. Compared with Example 1, the concentration of carbon nanomaterial in the dispersion in step (1) is 0.5 g / L, and the rest is the same as in Example 1.

[0059] Example 7

[0060] This embodiment provides a method for preparing carbon nanomaterial-supported fibers. Compared with Example 1, the dispersant in step (1) is replaced by sodium dodecylbenzenesulfonate by the same mass, and the rest is the same as in Example 1.

[0061] Example 8

[0062] This embodiment provides a method for preparing carbon nanomaterial-supported fibers. Compared with Example 1, the medium of the coagulation bath in step (2) is replaced with ethyl acetate, and the rest is the same as in Example 1.

[0063] Example 9

[0064] This embodiment provides a method for preparing carbon nanomaterial-supported fibers. Compared with Example 1, in step (2), the medium of the coagulation bath is replaced with an aqueous sodium sulfate solution with a concentration of 25%. The rest are the same as in Example 1.

[0065] Example 10

[0066] This embodiment provides a method for preparing carbon nanomaterial-supported fibers. Compared with Example 1, the medium of the coagulation bath in step (2) is replaced with sulfuric acid, and the rest is the same as in Example 1.

[0067] Comparative Example 1

[0068] This comparative example provides a method for preparing carbon nanomaterial-loaded fibers. Compared with Example 1, the coagulation bath treatment in step (2) is not performed. Instead, the glass fibers loaded with the dispersion in step (1) are directly dried to obtain the carbon nanomaterial-loaded fibers. All other aspects are the same as in Example 1.

[0069] Comparative Example 2

[0070] This comparative example provides a method for preparing carbon nanomaterial-supported fibers. Compared with Example 1, no dispersant is added in step (1), and the rest is the same as in Example 1.

[0071] The carbon nanomaterial-loaded fibers obtained in the examples and comparative examples were subjected to electrical performance tests using a four-probe method. The uniformity of the load was determined by testing the sheet resistance of different regions of the material and calculating its relative error. The load stability was evaluated by rinsing the fiber surface after loading with 1 MPa water pressure and calculating the change in sheet resistance before and after. The results are listed in Table 1.

[0072] Table 1

[0073]

[0074] Figure 1 and Figure 2 The figures show glass fibers before and after loading carbon nanomaterials as provided in Example 6. As can be seen from the figures, the carbon nanomaterials are uniformly loaded on the surface of the glass fibers and are tightly bonded.

[0075] As shown in Table 1, the concentration of carbon nanomaterials, loading time, and coagulation time are key factors in regulating the electrical properties, loading uniformity, and stability of the fiber surface. Specifically, compared to Example 1, in Examples 5-7, the concentration of carbon nanomaterials and their stable dispersion in water directly affect the fluctuation of resistance values ​​and the uniformity of their distribution. In Example 3, insufficient loading time can easily lead to uneven distribution of the load on the fiber. In Example 4, controlling the coagulation time is also crucial; if the time is too short, it will affect the effective replacement of the dispersant and the tight accumulation of carbon nanomaterials on the fiber surface, thereby weakening its electrical performance and overall stability. Meanwhile, in Examples 8-10, the specific combination of the dispersant and the coagulation bath medium also directly affects the loading effect of carbon nanomaterials. Different combinations will affect the replacement rate and degree of the dispersion system, thus affecting the loading of carbon nanomaterials on the fiber surface.

[0076] In summary, the carbon nanomaterial loading method provided by this invention is simple, efficient, and low-cost, requiring no complex dispersion formulation. The resulting carbon nanomaterial loaded with fibers has high purity and contains no other auxiliary additives besides the carbon nanomaterial and fibers. Furthermore, the loaded fibers exhibit strong encapsulation force and good stability.

[0077] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A method for preparing carbon nanomaterial-supported fibers, characterized in that, The preparation method includes the following steps: (1) Carbon nanomaterials, dispersants and solvents are mixed and dispersed, wherein the dispersants include ionic surfactants and / or nonionic surfactants to obtain carbon nanomaterial dispersions; (2) Load the carbon nanoparticle dispersion onto the fiber surface to obtain carbon nanoparticle dispersion-loaded fiber; (3) The carbon nanomaterials loaded with fibers are subjected to coagulation bath treatment in a coagulation bath. The medium of the coagulation bath includes at least one of butanol, pentanol, ethanol, polyethylene glycol, acetone, ethylene glycol butyl ether or ethyl acetate. The coagulation bath time is ≥4 min. After drying, the carbon nanomaterials loaded with fibers are obtained.

2. The preparation method according to claim 1, characterized in that, The carbon nanomaterials mentioned in step (1) include any one or a combination of at least two of the following: carbon nanotubes, carbon black, graphene, graphene oxide, or nanographite sheets.

3. The preparation method according to claim 2, characterized in that, The carbon nanotubes include single-walled carbon nanotubes and / or multi-walled carbon nanotubes.

4. The preparation method according to claim 2, characterized in that, The median length of the carbon nanotubes is 0.1-1000 μm.

5. The preparation method according to claim 4, characterized in that, The median length of the carbon nanotubes is 1-800 μm.

6. The preparation method according to claim 5, characterized in that, The median length of the carbon nanotubes is 10-500 μm.

7. The preparation method according to claim 2, characterized in that, The graphene or graphene oxide sheet diameter is 0.1-2000 μm.

8. The preparation method according to claim 7, characterized in that, The graphene or graphene oxide sheet diameter is 1-1000 μm.

9. The preparation method according to claim 8, characterized in that, The graphene or graphene oxide sheet diameter is 5-200 μm.

10. The preparation method according to claim 1, characterized in that, The dispersant in step (1) includes any one or a combination of at least two of the following: alkyl aryl phosphate, alkylbenzene sulfonate, dialkyl sulfosuccinate, polyoxyethylene alkylphenol ether, sorbitol alkylate, polycarboxylate, polymethacrylic acid derivative, maleic anhydride copolymer quaternary ammonium salt, pyridinium hydrochloride, or phosphate ester salt.

11. The preparation method according to claim 1, characterized in that, The mass ratio of the dispersant to the carbon nanomaterial in step (1) is (0.1-10):

1.

12. The preparation method according to claim 11, characterized in that, The mass ratio of the dispersant to the carbon nanomaterial in step (1) is (0.2-5):

1.

13. The preparation method according to claim 12, characterized in that, The mass ratio of the dispersant to the carbon nanomaterial in step (1) is (0.5-3):

1.

14. The preparation method according to claim 1, characterized in that, The dispersion method in step (1) includes any one or a combination of at least two of stirring, ultrasonication, homogenization, sand milling or emulsification.

15. The preparation method according to claim 1, characterized in that, The concentration of carbon nanomaterials in the carbon nano-dispersion in step (1) is 0.1-50 g / L.

16. The preparation method according to claim 15, characterized in that, The concentration of carbon nanomaterials in the carbon nano-dispersion in step (1) is 0.5-20 g / L.

17. The preparation method according to claim 16, characterized in that, The concentration of carbon nanomaterials in the carbon nano-dispersion in step (1) is 1-10 g / L.

18. The preparation method according to claim 1, characterized in that, The surface tension of the carbon nanoparticle dispersion in step (1) is 21-52 mN / m.

19. The preparation method according to claim 1, characterized in that, The viscosity of the carbon nanoparticle dispersion in step (1) is 10-10000 mPa·s.

20. The preparation method according to claim 19, characterized in that, The viscosity of the carbon nanoparticle dispersion in step (1) is 100-5000 mPa·s.

21. The preparation method according to claim 1, characterized in that, The fibers in step (2) include organic fibers and / or inorganic fibers.

22. The preparation method according to claim 21, characterized in that, The organic fibers include any one or a combination of at least two of the following: polyester, acrylic, nylon, polypropylene, aramid, polyethylene fiber, poly(p-phenylenebenzobisoxazole) fiber, poly(p-phenylenebenzodiimidazole) fiber, poly(p-phenylenepyridinium diimidazole) fiber, or polyimide fiber.

23. The preparation method according to claim 21, characterized in that, The inorganic fibers include any one or a combination of at least two of the following: glass fiber, quartz fiber, basalt fiber, ceramic fiber, alumina fiber, aluminum silicate fiber, mullite fiber, or silicon carbide fiber.

24. The preparation method according to claim 1, characterized in that, The loading method in step (2) includes any one or a combination of at least two of immersion, spraying or spin coating.

25. The preparation method according to claim 1, characterized in that, The loading time in step (2) is ≥10s.

26. The preparation method according to claim 25, characterized in that, The load duration is ≥1 min.

27. The preparation method according to claim 26, characterized in that, The load duration is ≥2 minutes.

28. A carbon nanomaterial-supported fiber, characterized in that, The carbon nanomaterial-supported fibers are prepared by the preparation method according to any one of claims 1-27.

29. The carbon nanomaterial-supported fiber according to claim 28, characterized in that, The sheet resistance of the carbon nanomaterial-supported fiber is 0.5-5000Ω / □.

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