Preparation method of hydrophobic conductive cotton fabric

Abstract

The invention discloses a preparation method of a hydrophobic conductive cotton fabric, which comprises the following steps of: after degreasing and modifying the cotton fabric with a silane coupling agent, sequentially dipping and drying the cotton fabric in CNTs / GO / Cu < 2 + > dispersion liquid prepared from acidified carbon nanotubes, graphene oxide and copper salt for multiple times to fix conductive components; then carrying out in-situ reduction to generate a CNTs / rGO / CuNPs conductive layer; and finally, packaging with polydimethylsiloxane to obtain the PDMS / CNTs / rGO / CuNPs hydrophobic conductive cotton fabric. The method is simple in process and low in cost, and the obtained fabric has the characteristics of high conductivity, lasting hydrophobicity and flexibility and wearable performance and is suitable for flexible sensing, electromagnetic shielding, electric heating and self-cleaning intelligent textiles.

Description

Technical Field

[0001] This invention relates to a method for preparing a hydrophobic conductive cotton fabric. Background Technology

[0002] With the rapid development of flexible electronics, smart wearable devices, and other fields, functional fabrics that combine excellent conductivity and hydrophobicity have become a research hotspot in the field of materials due to their broad application prospects in motion monitoring, medical and health care, special protection, and electronic skin. These fabrics need to simultaneously meet core requirements such as "stable conductivity, long-lasting hydrophobic effect, good mechanical flexibility, and simple preparation process" to adapt to the complex environments in practical applications.

[0003] Existing technologies for preparing hydrophobic conductive fabrics have the following main shortcomings:

[0004] (1) Some solutions use conductive polymers as conductive materials. By immersing the alkali-treated fabric in a buffer solution, the anionic groups of the buffer solution attract the conductive polymer monomers, and the hydrophobic conductive fabric is obtained through in-situ chemical oxidation polymerization. However, the conductivity stability of conductive polymers is lower than that of carbon materials, and their mechanical strength is poor. They are prone to cracking after repeated deformation, which affects the service life and reliability of the fabric.

[0005] (2) Another approach involves preparing superhydrophobic fabric-based functional materials through the steps of "alkali treatment of fabric → impregnation with conductive material solution and drying → impregnation with dispersion of surface-grafted modified nano-metal oxide particles and drying". This process is relatively complex, and nano-metal oxides are semiconductor materials with significantly lower conductivity than metal nanomaterials, making it difficult to meet the application requirements for high conductivity.

[0006] Furthermore, existing methods suffer from poor compatibility between the conductive material and the fabric substrate interface, easy detachment of the hydrophobic layer, and high preparation costs, which limit the large-scale production and widespread application of hydrophobic conductive fabrics. Therefore, developing a simple, low-cost method for preparing hydrophobic conductive fabrics that simultaneously achieves high conductivity, durable hydrophobicity, and good mechanical flexibility is of significant practical importance and application value. Summary of the Invention

[0007] This invention provides a method for preparing hydrophobic conductive cotton fabric to address the problems existing in the prior art. Through key steps of "cotton fabric pretreatment - silane coupling agent modification - composite conductive dispersion loading - in-situ reduction - PDMS encapsulation," this invention achieves a stable bond between conductive materials and the fabric substrate, constructs a three-dimensional conductive network, and endows the fabric with hydrophobic properties.

[0008] The technical solutions adopted in this invention are as follows:

[0009] A method for preparing a hydrophobic conductive cotton fabric, comprising:

[0010] (1) After the cotton fabric is treated to remove oil stains, it is washed with water and dried to obtain the degreased cotton fabric.

[0011] (2) The degreased cotton fabric is immersed in a silane coupling agent solution, washed and dried to obtain the modified cotton fabric.

[0012] (3) The acidified carbon nanotube dispersion, the graphene oxide dispersion, and the copper-containing salt compound were mixed to obtain CNTs / GO / Cu. 2+ Dispersion;

[0013] (4) Place the modified cotton fabric in the CNTs / GO / Cu 2+ In the dispersion, CNTs / GO / Cu²⁺ are fixed onto the surface of cotton fabric fibers through multiple impregnation-drying cycles.

[0014] (5) The fabric obtained in step (4) is reduced in situ using a reducing agent solution to reduce Cu 2+ The process involves converting the material into copper nanoparticles (CuNPs) and simultaneously reducing graphene oxide (GO) to reduced graphene oxide (rGO), forming a CNTs / rGO / CuNPs conductive layer to obtain conductive cotton fabric.

[0015] (6) The conductive cotton fabric is immersed in a mixed solution of polydimethylsiloxane (PDMS) and curing agent, and then dried to obtain a hydrophobic conductive cotton fabric.

[0016] Further, in step (1), the degreasing treatment is as follows: the cotton fabric is immersed in a fatty alcohol polyoxyethylene ether solution with a concentration of 0.5~2wt%, the immersion temperature is 30~80℃, and the immersion time is 10~50min.

[0017] Further, in step (2), the silane coupling agent is one of γ-aminopropyltrimethoxysilane (KH-551), γ-aminopropyltriethoxysilane (KH-550), γ-glycidoxypropyltrimethoxysilane (KH-560), γ-methacryloyloxypropyltrimethoxysilane (KH-570), γ-mercaptopropyltriethoxysilane (KH-580), n-octyltriethoxysilane, vinyltrimethoxysilane, or vinyltriethoxysilane.

[0018] Further, in step (2), the silane coupling agent solution is a mixed solution of silane coupling agent and ethanol, wherein the concentration of silane coupling agent is 0.2~2wt%, the soaking temperature is room temperature, the soaking time is 0.5~4h, the bath ratio is 1:60, and the washing is carried out with anhydrous ethanol.

[0019] Further, in step (3), the copper-containing salt compound is copper sulfate; the concentration of the acidified carbon nanotube dispersion is 0.5~5g / L, the concentration of the graphene oxide dispersion is 0.5~5g / L, and the amount of copper sulfate added is 4~70mmol.

[0020] Furthermore, the preparation process of the acidified carbon nanotube dispersion is as follows:

[0021] Carbon nanotubes were added to a mixed solution of sulfuric acid and nitric acid, magnetically stirred at 30-60°C for 10-80 min, sonicated for 10-80 min, and then magnetically stirred at 80-100°C for 10-80 min. The mixture was then washed with deionized water until neutral and dispersed in deionized water.

[0022] Furthermore, the volume ratio of sulfuric acid to nitric acid is (1~4):1, and the volume ratio of carbon nanotubes to the sulfuric acid-nitric acid mixed solution is 300mg:(20~60)mL.

[0023] Furthermore, the preparation process of the graphene oxide dispersion is as follows:

[0024] Add 10-50 mL of sulfuric acid, 0.2-2 g of graphite, and 0.1-1 g of sodium nitrate to the reaction system. After reacting for 0.5-2 h, add 1-4 g of potassium permanganate and stir to dissolve. After reacting at 0-15 °C for a period of time, raise the temperature to 25-50 °C, add 50-150 mL of deionized water, and stir at 80-115 °C. After the reaction is complete, add 10-25 mL of 30% hydrogen peroxide solution. After reacting for 0.5-3 h, centrifuge, wash, and dry the product, and then redisperse it in deionized water.

[0025] Further, in step (5), the reducing agent is one of L-ascorbic acid, tyrosine, citric acid, oxalic acid, tannic acid, dopamine, tea polyphenols, sodium hypophosphite, sodium sulfite, sodium hydrosulfite, glucose, hydrazine hydrate, sodium borohydride, formaldehyde, or acetaldehyde.

[0026] Further, in step (6), the mass ratio of polydimethylsiloxane (PDMS) to curing agent is 10:1, and the solvent of the mixed solution is tetrahydrofuran or n-hexane.

[0027] The present invention has the following beneficial effects:

[0028] (1) A continuous three-dimensional conductive network of CNTs / rGO / CuNPs can be formed on the surface of modified cotton fabric by one bath and one-step in-situ reduction. The process is simple, low cost, and the conductive layer has good compatibility with the substrate interface.

[0029] (2) PDMS encapsulation gives the fabric a lasting hydrophobic ability, keeps it away from everyday liquids and acid and alkali environments, has excellent chemical stability, and can form a dense physical barrier to effectively prevent the internal conductive materials from falling off, oxidizing and discoloring or corroding, and greatly improves the environmental tolerance and service life of conductive fabrics.

[0030] (3) The fabric can be heated quickly and evenly under low pressure, and it is flexible, thin and wearable. It can be applied to flexible sensing, electromagnetic shielding, electric heating and self-cleaning smart textiles.

[0031] (4) The superhydrophobic properties of the fabric surface enable the fabric surface to quickly return to a clean state, which significantly improves the ease of use and maintenance. Attached Figure Description

[0032] Figure 1 The contact angle test diagram and surface sheet resistance value of the hydrophobic and conductive cotton fabric are shown.

[0033] Figure 2 This is a graph showing the chemical stability test results for hydrophobic and conductive cotton fabric.

[0034] Figure 3 This is a test diagram of the self-cleaning properties of hydrophobic and conductive cotton fabric.

[0035] Figure 4 This is a test diagram of the electric heating performance of a hydrophobic and conductive cotton fabric. Detailed Implementation

[0036] The invention will now be further described with reference to the accompanying drawings.

[0037] The raw materials used in the following examples are as follows:

[0038] Cotton fabric: 3cm x 3cm (natural cellulose fiber with hydroxyl active sites on the surface);

[0039] Fatty alcohol polyoxyethylene ether, ethanol, anhydrous ethanol, sulfuric acid, nitric acid, sodium nitrate, potassium permanganate, hydrogen peroxide (volume concentration 30%), copper sulfate pentahydrate (CuSO4·5H2O), L-ascorbic acid, polydimethylsiloxane (PDMS), curing agent, tetrahydrofuran, n-hexane;

[0040] Carbon nanotubes and graphite: purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0041] Sodium nitrate: purchased from Shanghai Zhenxin Reagent Factory;

[0042] Potassium permanganate: purchased from Shanghai Lingfeng Chemical Reagent Co., Ltd.;

[0043] Hydrogen peroxide: purchased from Xilong Chemical Co., Ltd.;

[0044] Copper sulfate pentahydrate: purchased from Shanghai Runjie Chemical Reagent Co., Ltd.;

[0045] L-Ascorbic acid: purchased from Shanghai Maclean Biochemical Technology Co., Ltd.;

[0046] Polydimethylsiloxane (PDMS): purchased from Dow Corning Limited;

[0047] Tetrahydrofuran: Purchased from Xilong Chemical Co., Ltd.;

[0048] n-Hexane: Purchased from Shanghai Maclean Biochemical Technology Co., Ltd.;

[0049] Silane coupling agent: γ-glycidoxypropyltrimethoxysilane (KH-560).

[0050] Example 1

[0051] Oil stain removal treatment for cotton fabrics: Immerse a 3cm×3cm cotton fabric in a mixed solution of fatty alcohol polyoxyethylene ether and water at a volume ratio of 1:100 and a bath ratio of 1:60 at 55℃ for 30 minutes. After removal, wash repeatedly with deionized water to remove residual reagents, and dry to obtain the oil-removed cotton fabric.

[0052] Modification of cotton fabric: The above-mentioned degreased cotton fabric was placed in a mixed solution of γ-glycidoxypropyltrimethoxysilane (KH-560) and ethanol at a bath ratio of 1:60, wherein the concentration of γ-glycidoxypropyltrimethoxysilane was 1wt%, and soaked at room temperature for 2 hours. After removal, it was washed with anhydrous ethanol and dried to obtain modified cotton fabric (CF).

[0053] Preparation of acidified carbon nanotube dispersion: Weigh 300 mg of carbon nanotubes and place them in a three-necked flask. Add 30 mL of a mixed solution of sulfuric acid and 10 mL of nitric acid (volume ratio of sulfuric acid to nitric acid 3:1). The volume ratio of carbon nanotubes to the mixed solution is 300 mg: 40 mL. Stir magnetically at 50 °C for 40 min, then sonicate for 30 min, and then stir magnetically at 98 °C for 30 min. Wash with deionized water until the filtrate is neutral and disperse in deionized water to obtain an acidified carbon nanotube dispersion with a concentration of 2 g / L.

[0054] Preparation of graphene oxide dispersion: 30 mL of sulfuric acid, 0.8 g of graphite, and 0.5 g of sodium nitrate were added to a three-necked flask. After reacting at room temperature for 1 h, 2.5 g of potassium permanganate was added and stirred until completely dissolved. After reacting at 10 °C for a period of time, the temperature was raised to 40 °C, 80 mL of deionized water was added, and the mixture was stirred at 95 °C. After the reaction was completed, 15 mL of 30% hydrogen peroxide solution was slowly added, and the reaction was continued for 2 h. The product was centrifuged and washed until neutral, dried under vacuum at 60 °C, and then dispersed in deionized water to obtain a graphene oxide dispersion with a concentration of 2 g / L.

[0055] Preparation and loading of conductive dispersion: 48 mmol of copper sulfate pentahydrate, 14 mL of 2 g / L acidified carbon nanotube dispersion, and 6 mL of 2 g / L graphene oxide dispersion were mixed evenly to prepare a CNTs / GO / CuSO4 dispersion. Modified cotton fabric was immersed in this dispersion and subjected to a "immersion-drying" cycle, with each immersion lasting 10 min and drying at 60℃ for 20 min, repeated multiple times until the dispersion was completely fixed to the fabric surface, yielding CNTs / GO / CuSO4. 2+ Cotton fabric.

[0056] In-situ restoration: Removing CNTs / GO / Cu 2+ The cotton fabric was placed in a 2 g / L L-ascorbic acid reducing solution, the pH was adjusted to 6, and the fabric was reduced in a 95℃ water bath for 3 hours to convert Cu²⁺ into copper nanoparticles (CuNPs). At the same time, graphene oxide (GO) was reduced to reduced graphene oxide (rGO), forming a CNTs / rGO / CuNPs conductive layer, thus obtaining a conductive cotton fabric.

[0057] PDMS encapsulation: Mix 4g PDMS with 0.4g curing agent evenly and dissolve in 30mL tetrahydrofuran solution. Immerse the above conductive cotton fabric in the mixed solution for 1min and dry at 80℃ to obtain PDMS / CNTs / rGO / CuNPs hydrophobic conductive cotton fabric.

[0058] Example 2

[0059] The process steps and parameters in this embodiment are the same as those in Embodiment 1, except that the immersion time is adjusted in the PDMS encapsulation step, as follows:

[0060] In step 7, the conductive cotton fabric is immersed in a tetrahydrofuran mixed solution of PDMS and curing agent for 5 minutes and dried at 80°C. The remaining steps are the same as in Example 1 to obtain a hydrophobic conductive cotton fabric.

[0061] Example 3

[0062] The process steps and parameters in this embodiment are the same as those in Embodiment 2, except that the number of "impregnation-drying" cycles is adjusted in the conductive dispersion loading step, as follows:

[0063] In step 5, the "immersion-drying" cycle is repeated twice; in step 7, the conductive cotton fabric is immersed in a tetrahydrofuran mixed solution of PDMS and curing agent for 5 minutes and dried at 80°C. The remaining steps are the same as in Example 1 to obtain a hydrophobic conductive cotton fabric.

[0064] Example 4

[0065] The process steps and parameters in this embodiment are the same as those in Embodiment 2, except that the number of "impregnation-drying" cycles is adjusted in the conductive dispersion loading step, as follows:

[0066] In step 5, the "immersion-drying" cycle is repeated 3 times; in step 7, the conductive cotton fabric is immersed in a tetrahydrofuran mixed solution of PDMS and curing agent for 5 minutes and dried at 80°C. The remaining steps are the same as in Example 1 to obtain a hydrophobic conductive cotton fabric.

[0067] Comparative Example 1

[0068] The process steps and parameters of this comparative example are the same as those of Example 1, except that the PDMS packaging step is omitted. The details are as follows:

[0069] Steps 1-6 are the same as in Example 1, resulting in CNTs / rGO / CuNPs conductive cotton fabric (without PDMS hydrophobic encapsulation layer), which is used to verify the effect of PDMS encapsulation on the hydrophobic properties of the fabric.

[0070] Comparative Example 2

[0071] The process steps and parameters in this embodiment are the same as those in Embodiment 2, except that the solvent type of the mixed solution is adjusted in the PDMS encapsulation step, as follows:

[0072] In step 7, 4g of PDMS and 0.4g of curing agent are mixed evenly and dissolved in 30mL of n-hexane solution. The conductive cotton fabric is soaked for 5min and dried at 80℃. The remaining steps are the same as in Example 1 to obtain hydrophobic conductive cotton fabric.

[0073] Comparative Example 3

[0074] The process steps and parameters in this embodiment are the same as those in Comparative Example 2, except that the number of "impregnation-drying" cycles is adjusted in the conductive dispersion loading step, as follows:

[0075] In step 5, the "immersion-drying" cycle is repeated twice; in step 7, the conductive cotton fabric is immersed in a mixed solution of PDMS and curing agent in n-hexane for 5 minutes and dried at 80°C. The remaining steps are the same as in Example 1 to obtain a hydrophobic conductive cotton fabric.

[0076] Performance Tests and Results

[0077] The products of Examples 1-4 and Comparative Examples 1-3 were subjected to performance tests using the following test methods. The test results are illustrated below with reference to the accompanying drawings:

[0078] Contact angle test: The surface wetting characteristics of the product were investigated by static water contact angle test. The test results are as follows: Figure 1 As shown. By Figure 1It can be seen that the contact angle of Comparative Example 1 (without PDMS encapsulation) is 0°, indicating hydrophilicity. The contact angles of Examples 1-4 (PDMS-tetrahydrofuran system) are 147.2°, 153.0°, 156.6°, and 159.0°, respectively. With the increase of PDMS immersion time and the number of "immersion-drying" cycles, the contact angle gradually increases, and the hydrophobic performance is continuously optimized. The contact angles of Comparative Examples 2-3 (PDMS-n-hexane system) are 140.2° and 143.7°, respectively, which are lower than those of the tetrahydrofuran system under the same conditions, indicating that tetrahydrofuran, as a solvent, is more conducive to the formation of a complete hydrophobic layer of PDMS on the fabric surface. In addition, durability tests were conducted on Example 4. After 20 washes and rubs, the contact angles were 157.9° and 154.1°, respectively. The contact angle decreased but was still higher than 150°, indicating that the PDMS coating on the fabric surface has good adhesion and abrasion resistance.

[0079] Conductivity test: The sheet resistance of the hydrophobic conductive cotton fabric was tested using a four-probe tester. The test results are as follows: Figure 1 As shown, the sheet resistance of the fabric increases with increasing PDMS impregnation time or number of impregnations, indicating that PDMS penetrates into the conductive layer on the fabric surface, leading to a reduction in the contact area between conductive materials, but still retaining most of the conductive pathways, and the fabric still exhibits good conductivity. After washing or rubbing, the sheet resistance of the fabric also increases, possibly because some poorly adhered conductive materials on the fabric surface detach slightly under external force, but this is within acceptable limits.

[0080] Chemical stability test: Common household liquids and acid / alkali solutions were added to the surface of the product to assess the hydrophobic stability. The test results are as follows: Figure 2 As shown. By Figure 2 It can be seen that when water, milk, cola, juice, coffee, tea and other everyday liquids, as well as strong acid solution with pH=1, NaCl solution with pH=7, strong alkali solution with pH=14 and red, yellow and blue dye solutions are added to the surface of the products of Examples 1-4, the droplets all remain spherical and do not spread. A silver mirror-like luster is formed between the fabric and the droplets, which proves that the products have stable hydrophobic properties in acid, alkali and everyday media and have excellent chemical resistance.

[0081] Self-cleaning test: The product was fixed on a glass slide and placed at an angle. Sand was sprinkled on the slide as a contaminant, and deionized water was added to assess the self-cleaning ability. The test results are as follows: Figure 3 As shown. By Figure 3 It can be seen that when water droplets roll off, they can carry away mud and sand pollutants from the fabric surface, restoring the fabric surface to its initial clean state without water droplet residue, exhibiting a self-cleaning effect similar to that of lotus leaves, thus verifying the practical application value of the product's hydrophobic properties.

[0082] Electrical heating performance test: A rated voltage of 7V was applied across the product of Example 2, and the surface temperature change was recorded using an infrared thermal imager. The test results are as follows: Figure 4 As shown. By Figure 4 It can be seen that the product of Example 2 heats up rapidly after being energized: the temperature is 22.5℃ at 0s, rises to 42.5℃ at 30s, rises to 65.7℃ at 60s, and stabilizes at 67.2℃ at 90s; the heat distribution on the fabric surface is uniform throughout the heating process, and it has the characteristics of rapid heating and constant temperature stability of electric heating.

[0083] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a hydrophobic and conductive cotton fabric, characterized in that: include: (1) After the cotton fabric is treated to remove oil stains, it is washed with water and dried to obtain the degreased cotton fabric. (2) The degreased cotton fabric is immersed in a silane coupling agent solution, washed and dried to obtain the modified cotton fabric. (3) The acidified carbon nanotube dispersion, the graphene oxide dispersion, and the copper-containing salt compound were mixed to obtain CNTs / GO / Cu. 2+ Dispersion; (4) Place the modified cotton fabric in the CNTs / GO / Cu 2+ In the dispersion, CNTs / GO / Cu²⁺ are fixed onto the surface of cotton fabric fibers through multiple impregnation-drying cycles. (5) The fabric obtained in step (4) is reduced in situ using a reducing agent solution to reduce Cu 2+ The process involves converting the material into copper nanoparticles (CuNPs) and simultaneously reducing graphene oxide (GO) to reduced graphene oxide (rGO), forming a CNTs / rGO / CuNPs conductive layer to obtain conductive cotton fabric. (6) The conductive cotton fabric is immersed in a mixed solution of polydimethylsiloxane (PDMS) and curing agent, and then dried to obtain a hydrophobic conductive cotton fabric.

2. The method for preparing the hydrophobic conductive cotton fabric as described in claim 1, characterized in that: In step (1), the degreasing treatment is as follows: the cotton fabric is immersed in a fatty alcohol polyoxyethylene ether solution with a concentration of 0.5~2wt%, the immersion temperature is 30~80℃, and the immersion time is 10~50min.

3. The method for preparing the hydrophobic conductive cotton fabric as described in claim 1, characterized in that: In step (2), the silane coupling agent is one of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, n-octyltriethoxysilane, vinyltrimethoxysilane, or vinyltriethoxysilane.

4. The method for preparing the hydrophobic conductive cotton fabric as described in claim 3, characterized in that: In step (2), the silane coupling agent solution is a mixed solution of silane coupling agent and ethanol, wherein the concentration of silane coupling agent is 0.2~2wt%, the soaking temperature is room temperature, the soaking time is 0.5~4h, the bath ratio is 1:60, and anhydrous ethanol is used for washing.

5. The method for preparing the hydrophobic conductive cotton fabric as described in claim 1, characterized in that: In step (3), the copper-containing salt compound is copper sulfate; the concentration of the acidified carbon nanotube dispersion is 0.5~5g / L, the concentration of the graphene oxide dispersion is 0.5~5g / L, and the amount of copper sulfate added is 4~70mmol.

6. The method for preparing hydrophobic conductive cotton fabric as described in claim 1 or 5, characterized in that: The preparation process of the acidified carbon nanotube dispersion is as follows: Carbon nanotubes were added to a mixed solution of sulfuric acid and nitric acid, magnetically stirred at 30-60°C for 10-80 min, sonicated for 10-80 min, and then magnetically stirred at 80-100°C for 10-80 min. The mixture was then washed with deionized water until neutral and dispersed in deionized water.

7. The method for preparing the hydrophobic conductive cotton fabric as described in claim 6, characterized in that: The volume ratio of sulfuric acid to nitric acid is (1~4):1, and the volume ratio of carbon nanotubes to sulfuric acid-nitric acid mixed solution is 300mg:(20~60)mL.

8. The method for preparing hydrophobic conductive cotton fabric as described in claim 1 or 5, characterized in that: The preparation process of the graphene oxide dispersion is as follows: Add 10-50 mL of sulfuric acid, 0.2-2 g of graphite, and 0.1-1 g of sodium nitrate to the reaction system. After reacting for 0.5-2 h, add 1-4 g of potassium permanganate and stir to dissolve. After reacting at 0-15 °C for a period of time, raise the temperature to 25-50 °C, add 50-150 mL of deionized water, and stir at 80-115 °C. After the reaction is complete, add 10-25 mL of 30% hydrogen peroxide solution. After reacting for 0.5-3 h, centrifuge, wash, and dry the product, and then redisperse it in deionized water.

9. The method for preparing the hydrophobic conductive cotton fabric as described in claim 1, characterized in that: In step (5), the reducing agent is one of L-ascorbic acid, tyrosine, citric acid, oxalic acid, tannic acid, dopamine, tea polyphenols, sodium hypophosphite, sodium sulfite, sodium hydrosulfite, glucose, hydrazine hydrate, sodium borohydride, formaldehyde, or acetaldehyde.

10. The method for preparing the hydrophobic conductive cotton fabric as described in claim 1, characterized in that: In step (6), the mass ratio of polydimethylsiloxane (PDMS) to curing agent is 10:1, and the solvent of the mixed solution is tetrahydrofuran or n-hexane.

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