A flexible conductive hydrophobic material and its preparation method

Abstract

This invention discloses a method for preparing a flexible conductive hydrophobic material, comprising the following steps: Step 1, activating the flexible fabric through atmospheric pressure plasma pretreatment; Step 2, brushing liquid metal onto the surface of the activated flexible fabric; Step 3, coating polydimethylsiloxane onto the flexible surface coated with liquid metal, and then cross-linking to form a film to obtain the flexible conductive hydrophobic material. In this invention, the atmospheric pressure plasma method is used to pretreat the surface of the fiber / yarn / fabric, which allows the liquid metal to be uniformly distributed on the surface of the fiber / yarn / fabric. An organosilicon polymer is then attached to the surface, and cross-linking is induced under the action of plasma or a chemical cross-linking agent to form a coating. This not only effectively prevents the aggregation of liquid metal on the fiber / yarn surface but also imparts a certain degree of waterproofing to the yarn / fiber, further protecting the conductive stability of the material, while not affecting the overall performance of the fiber / yarn.

Description

Technical Field

[0001] This invention relates to the field of flexible conductive hydrophobic materials, specifically to a flexible conductive hydrophobic material and its preparation method. Background Technology

[0002] Research on hydrophobic materials has a long history. Superhydrophobic materials refer to materials whose water contact angle is greater than 90° and into which water cannot penetrate. Currently, one of the research hotspots regarding hydrophobic materials is multifunctional hydrophobic materials, of which flexible conductive hydrophobic materials are one type. Flexible conductive hydrophobic materials combine excellent hydrophobicity and conductivity, and can be applied in fields such as waterproof sensors, anti-icing and de-icing materials, and electromagnetic shielding materials where special requirements for material deformation performance are required. The presence of hydrophobic properties can further improve service life and expand application scenarios.

[0003] In the article "Preparation and Properties of Liquid Metal / Polyurethane Composite Elastic Conductive Fibers," highly elastic thermoplastic polyurethane (TPU) fibers were prepared using a wet spinning method. Then, waterborne polyurethane (WPU) was dip-coated as an adhesive layer to improve the wettability between TPU and liquid metal (LM). LM was coated under pre-stretch conditions to enhance the fiber's electrical resistance stability. Finally, the LM layer was encapsulated within the WPU coating using a dip-coating method to obtain composite elastic conductive fibers. Meanwhile, in the article "Preparation and Properties of Polyurethane-Based Carbon Nanotube-Liquid Metal Conductive Fibers," to address the insufficient elasticity of carbon nanotubes (CNTs) as conductive fillers, CNTs and liquid metal (LM) were used as conductive fillers, thermoplastic polyurethane (TPU) as the matrix, N,N-dimethylformamide (DMF) as the solvent, and deionized water as the coagulation bath. (CNT)LM / TPU conductive fibers were prepared by wet spinning, and the properties of LM and liquid metal (LM) were investigated. The impact of CNTs (carbon nanotubes) on fiber structure and properties; however, liquid metal has poor wettability with flexible substrates, making it easy to detach from the substrate. Existing technologies use waterborne polyurethane (TPU) to improve the bonding performance between liquid metal and flexible substrates, but the use of TPU affects the feel and some performance characteristics of the fiber material. At the same time, liquid metal has a large surface tension (>450 N / m), which easily agglomerates under internal stress during use, leading to uneven coating and decreased conductivity. Existing technologies mainly address this by coating with waterborne polyurethane or mixing it with spinning solution. The preparation of spinning solution requires the use of organic solvents, and a large amount of liquid metal needs to be added to obtain better conductivity, which will reduce the mechanical properties of the fiber to some extent. To reduce the amount of liquid metal used, it needs to be mixed with carbon nanotubes, which makes the preparation of uniform spinning solution more difficult and increases the difficulty of spinning. In existing technologies, fibers produced by the mixed spinning method cannot be directly used for weaving and need to be twisted into yarn. During the processing, the fibers will be worn, and uneven or rough fiber surfaces or poor uniformity along the length direction will affect the yarn performance. Summary of the Invention

[0004] This invention designs and develops a flexible conductive hydrophobic material. The purpose of this invention is to solve the problems of unstable conductivity, poor hydrophobicity, poor waterproofness, and poor overall performance of existing flexible materials.

[0005] This invention designs and develops a method for preparing flexible conductive hydrophobic materials. The purpose of this invention is to solve the problems of uniform dispersion of liquid metal during preparation and easy agglomeration during use. At the same time, the plasma treatment only treats the surface of the fiber / yarn at a number of nanometers, ensuring waterproofing without affecting the overall performance of the fiber / yarn.

[0006] The technical solution provided by this invention is as follows:

[0007] A method for preparing a flexible conductive hydrophobic material includes the following steps:

[0008] Step 1: Activate the flexible fabric by pretreatment with atmospheric pressure plasma;

[0009] Step 2: Apply liquid metal to the surface of the activated flexible fabric by brushing.

[0010] Step 3: After coating polydimethylsiloxane onto the flexible surface of the brush-coated liquid metal, cross-linking is performed to form a film, thereby obtaining the flexible conductive hydrophobic material.

[0011] Preferably, in step one, the plasma pretreatment process includes: the working gas being one or more of oxygen, hydrogen, carbon dioxide, and nitrogen; the processing power being 100–500W; the processing time being 3–100s; and the processing spacing being 1–3.5mm.

[0012] Preferably, in step two, the coating thickness is controlled to be 0.1–4 mm.

[0013] Preferably, in step three, the crosslinking film formation process includes a plasma-induced crosslinking film formation process: polydimethylsiloxane with a viscosity of 1000-10000 cps is selected as the raw material, coated onto the flexible surface of the brush-coated liquid metal, and then placed in a plasma discharge chamber to induce crosslinking film formation.

[0014] Preferably, the processing parameters for inducing cross-linking film formation in the plasma discharge cavity are: the plasma discharge device is capacitively coupled and inductively coupled discharge, and can be classified into one of DC, pulse, low frequency, and radio frequency plasma discharge according to the discharge frequency;

[0015] The reactant gases are argon, helium, oxygen, and air, or a mixture of one or more of these gases; and

[0016] The power is 50-500W, the modulation pulse is 2%-100%, the processing time is 20-300s, and the processing interval is 1-12cm.

[0017] Preferably, in step three, the crosslinking film formation process includes a chemical crosslinking agent crosslinking film formation process: selecting hydroxyl-terminated polydimethylsiloxane with a viscosity of 1000-4000 cps as raw material, tetraethyl orthosilicate as crosslinking agent, and dioctyltin dilaurate as catalyst, and then coating it onto the flexible surface of the brush-coated liquid metal, and placing it in an oven for heating to crosslink and form a film.

[0018] Preferably, in step three, the crosslinking film formation process includes a chemical crosslinking agent crosslinking film formation process: Dow Corning 184 is selected as the raw material, polydimethylsiloxane and crosslinking agent are thoroughly mixed and coated onto the flexible surface of the brush-coated liquid metal, and then placed in an oven for heating to crosslink and form a film.

[0019] Preferably, the crosslinking temperature is 60–150°C and the crosslinking time is 30–600 min.

[0020] Preferably, the coating thickness is between 0.5 and 5 mm.

[0021] A flexible conductive hydrophobic material is prepared using the aforementioned method for preparing flexible conductive hydrophobic materials.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. The preparation method of the flexible conductive hydrophobic material provided by the present invention uses atmospheric pressure plasma to activate and roughen the material surface. The operation is simple and effective. After plasma surface activation, liquid metal can be uniformly dispersed on the material surface. At the same time, by using polydimethylsiloxane to coat the material surface, the problem of unstable conductivity caused by the large internal stress and easy accumulation of liquid metal can be effectively solved.

[0024] 2. The increased surface roughness of the flexible conductive hydrophobic material after plasma treatment provided by the present invention can appropriately increase the amount of liquid metal adhering to the material surface, further increasing the conductivity. The use of organosilicon polymers to adhere to its surface and induce cross-linking to form a coating under the action of plasma or chemical cross-linking agents can also impart certain hydrophobic functions to the yarn / fiber, further protecting the conductive stability of the material.

[0025] 3. The flexible conductive hydrophobic material provided by the present invention is made by uniformly distributing liquid metal on the material surface to form a flexible conductive electrothermal material. The method of plasma pretreatment and siloxane polymer coating can ensure the conductivity of liquid metal without affecting the extension of liquid metal on the material surface, thereby ensuring the conductivity of flexible conductive material under deformation conditions. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the surface temperature of the conductive fabric after energization in Embodiment 1 of the present invention.

[0027] Figure 2 This is a graph showing the change in surface temperature of the conductive fabric over time under different terminal voltages in Embodiment 1 of the present invention.

[0028] Figure 3 This is a temperature distribution diagram of the fabric surface when the voltage across both ends is 1.5V according to Embodiment 5 of the present invention.

[0029] Figure 4 This is a graph showing the average surface temperature change of the fabric under different voltages in Example 5 of the present invention.

[0030] Figure 5 The static water contact angle diagram of the flexible conductive fabric surface prepared in Example 8 of the present invention. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0032] This invention provides a method for preparing a flexible conductive hydrophobic material, specifically including the following steps:

[0033] Step 1: To solve the surface wetting problem of liquid metal, atmospheric pressure plasma method is used to pretreat the surface of fiber / yarn / fabric using atmospheric pressure plasma method;

[0034] Depending on the material, the working gas is one or more of oxygen, hydrogen, carbon dioxide, and nitrogen. The processing power is 100-500W, the processing time is 3-100s, and the processing spacing is 1-3.5mm. Active groups are introduced on the surface to activate the surface. The etching process can increase the surface roughness, which allows the liquid metal to be evenly distributed on the fiber / fabric surface.

[0035] Step 2: Select indium gallium alloy liquid metal as raw material and directly brush it onto the surface of fiber / yarn / fabric cut into a certain shape. Alternatively, screen printing technology can be used on the fabric surface to coat it into a certain shape to form circuits with different structures.

[0036] The coating structure includes, but is not limited to, circular, U-shaped, string-shaped, and mosquito coil-shaped structures. To ensure conductivity, the coating thickness is preferably controlled between 0.1 and 4 mm.

[0037] Step 3: Crosslinking of polysiloxane into a film. In this invention, plasma-induced crosslinking or chemical crosslinking agents are used for film formation, specifically including the following processes:

[0038] (1) The process of plasma-induced cross-linking film formation includes: selecting polydimethylsiloxane with a viscosity of 1000-10000cps as raw material, scraping it onto the surface of fibers / yarns / fabrics cut into a certain shape with liquid metal adhering to the surface, controlling the scraping thickness between 0.5-5mm, and then placing it in a plasma discharge chamber, discharging under certain conditions, and inducing cross-linking film formation; wherein, the processing parameters are: the plasma discharge device is capacitive coupling and inductive coupling discharge, which can be divided into DC, pulse, low frequency, and radio frequency plasma discharge according to the discharge frequency; the reaction gas is argon, helium, oxygen, air, etc., one or a mixture of several; the power is 50-500W; the modulation pulse is 2%-100%; the processing time is 20-300s; and the processing interval is 1-12cm.

[0039] (2) The process of cross-linking film formation using chemical cross-linking agents includes:

[0040] ① Select hydroxyl-terminated polydimethylsiloxane with a viscosity of 1000-4000 cps as raw material, tetraethyl orthosilicate as crosslinking agent, and di-n-octyltin dilaurate as catalyst, and mix them in a certain mass ratio (M 聚二甲基硅氧烷 M 正硅酸乙酯 M 二月桂酸二正辛基锡 =100:5:1~100:10:2) After thorough mixing, apply the mixture to the surface of fibers / yarns / fabrics cut into a certain shape that have liquid metal adhering to them. The coating thickness should be controlled between 0.5 and 5 mm.

[0041] ② Dow Corning 184 was selected as the raw material, and polydimethylsiloxane and crosslinking agent were mixed in a certain mass ratio (M 聚二甲基硅氧烷 M 交联剂 =10:1~10:5) After thorough mixing, apply the mixture to the surface of fibers / yarns / fabrics cut into a certain shape that have liquid metal adhering to them. The coating thickness should be controlled between 0.5 and 5 mm.

[0042] After the above-mentioned coating is applied to the surface of fibers / yarns / fabrics cut into a certain shape with liquid metal adhering to the surface, it is placed in an oven and heated to crosslink into a film. The crosslinking temperature is 60-150℃ and the crosslinking time is 30-600min.

[0043] The present invention also provides a flexible conductive hydrophobic material, which is prepared by the above-described method for preparing flexible conductive hydrophobic materials.

[0044] The present invention will be further described below with reference to specific embodiments.

[0045] Example 1

[0046] Using polyester woven plain weave fabric as the flexible material, cut to approximately 1cm × 5cm, and surface activation was performed using atmospheric pressure plasma. The treatment process was as follows: working gas was air, treatment power was 300W, treatment time was 50s, and treatment spacing was 2.8mm. Liquid metal was uniformly brushed onto the surface of the activated fabric at room temperature, with a coating thickness of 4mm. Polydimethylsiloxane with a viscosity of 10000cps was selected as the raw material and scraped onto the fabric surface with the adhering liquid metal, with a coating thickness of 5mm. The fabric was then placed in a plasma discharge chamber with the following parameters: low-voltage capacitively coupled discharge plasma device, discharge mode was radio frequency discharge, reaction gas was argon, power was 50W, modulation frequency was 100%, treatment time was 300s, and treatment spacing was 1cm. The surface polydimethylsiloxane was induced to cross-link and form a film under the action of plasma, resulting in a flexible, conductive, hydrophobic polyester fabric.

[0047] Example 2

[0048] Polyester woven plain weave fabric was used as the flexible material, cut to approximately 1cm × 10cm. Surface activation was performed using atmospheric pressure plasma. The process involved: air as the working gas, 300W of processing power, 50s of processing time, and a processing interval of 2.8mm. Liquid metal was uniformly brushed onto the activated fabric surface at room temperature, with a coating thickness of 2mm. Polydimethylsiloxane with a viscosity of 5000cps was then applied to the fabric surface with the liquid metal adhering, with a coating thickness of 2mm. The fabric was then placed in a plasma discharge chamber with the following parameters: low-voltage capacitively coupled discharge plasma device, radio frequency discharge, argon as the reaction gas, 200W of power, 75% modulation frequency, 200s of processing time, and a processing interval of 8cm. The polydimethylsiloxane on the surface was induced to cross-link and form a film under plasma action, resulting in a flexible, conductive, hydrophobic polyester fabric.

[0049] Example 3

[0050] Polyester woven plain weave fabric was used as the flexible material, cut to approximately 1cm × 10cm. Surface activation was performed using atmospheric pressure plasma. The process involved: working gas air, processing power 300W, processing time 50s, and processing spacing 2.8mm. Liquid metal was uniformly brushed onto the activated fabric surface at room temperature, with a coating thickness of 0.1mm. Polydimethylsiloxane with a viscosity of 1000cps was then applied to the fabric surface with the liquid metal adhering, with a coating thickness of 0.5mm. The fabric was then placed in a plasma discharge chamber with the following parameters: low-voltage inductively coupled plasma device, pulsed discharge, helium gas, power 500W, modulation frequency 2%, processing time 20s, and processing spacing 12cm. The polydimethylsiloxane on the surface was induced to cross-link and form a film under plasma action, resulting in a flexible, conductive, hydrophobic polyester fabric.

[0051] Example 4

[0052] Using high-density nylon woven plain weave fabric as the flexible material, cut to approximately 10cm × 10cm, and surface activation was performed using atmospheric pressure plasma. The process involved a mixed gas of hydrogen, carbon dioxide, and nitrogen, a processing power of 500W, a processing time of 3 seconds, and a processing spacing of 1mm. At room temperature, an "S-shaped" mask was selected, and liquid metal was printed onto the surface of the activated fabric using screen printing technology, with a liquid metal thickness of 4mm. Polydimethylsiloxane with a viscosity of 4000cps was selected as the raw material and mixed with tetraethyl orthosilicate and di-n-octyltin dilaurate at a mass ratio of 50:5:1 and stirred evenly. This mixture was then uniformly coated onto the fabric surface with the adhered liquid metal using a scraping method, with a coating thickness of approximately 5mm. The mixture was then cured at 80℃ for 480 minutes to produce a flexible, conductive, hydrophobic nylon fabric.

[0053] Example 5

[0054] Using polyester weft-knitted fabric as a flexible material, cut to approximately 1cm × 10cm, surface activation was performed under atmospheric pressure plasma. The process involved a mixed gas of hydrogen, carbon dioxide, and nitrogen, a processing power of 100W, a processing time of 100s, and a processing interval of 3.5mm. Liquid metal was then uniformly brushed onto the surface of the activated fabric at room temperature, with a coating thickness of 0.1mm. Polydimethylsiloxane with a viscosity of 1000cps was selected as the raw material and mixed with tetraethyl orthosilicate and di-n-octyltin dilaurate at a mass ratio of 100:5:1. The mixture was stirred until homogeneous and then uniformly coated onto the fabric surface with the liquid metal using a scraping method, with a coating thickness of approximately 0.5mm. The mixture was then cured at 120℃ for 30 minutes to produce a flexible, conductive, hydrophobic polyester fabric.

[0055] Example 6

[0056] High-density nylon woven plain weave fabric was used as the flexible material, cut to approximately 10cm × 10cm. Surface activation was performed using atmospheric pressure plasma. The process involved air as the working gas, 500W of processing power, 3 seconds of processing time, and 1mm of processing spacing. At room temperature, an "S-shaped" mask was used, and liquid metal was printed onto the activated fabric surface using screen printing technology. The liquid metal thickness was 4mm. Hydroxyl-terminated polydimethylsiloxane with a viscosity of 4000cps was selected as the raw material and mixed with tetraethyl orthosilicate and di-n-octyltin dilaurate at a mass ratio of 50:5:1. The mixture was stirred evenly and then uniformly coated onto the fabric surface with the liquid metal using a scraping method. The coating thickness was approximately 5mm. The mixture was then cured at 60℃ for 600 minutes to produce a flexible, conductive, hydrophobic nylon fabric.

[0057] Example 7

[0058] High-density nylon woven plain weave fabric was used as the flexible material, cut to approximately 10cm × 10cm. Surface activation was performed using atmospheric pressure plasma. The process involved a nitrogen-oxygen mixture as the working gas, a processing power of 400W, a processing time of 20s, and a processing spacing of 2.5mm. At room temperature, an "S-shaped" mask was used, and liquid metal was printed onto the surface of the activated fabric using screen printing technology. The liquid metal thickness was 2mm. Hydroxyl-terminated polydimethylsiloxane with a viscosity of 3000cps was selected as the raw material and mixed with tetraethyl orthosilicate and di-n-octyltin dilaurate at a mass ratio of 75:5:1. The mixture was stirred evenly and then uniformly coated onto the fabric surface with the liquid metal using a scraping method, with a coating thickness of approximately 3mm. The mixture was then cured at 100℃ for 240 minutes to produce a flexible, conductive, hydrophobic nylon fabric.

[0059] Example 8

[0060] High-density nylon woven plain weave fabric was used as the flexible material, cut to approximately 1cm × 10cm. Surface activation was performed using atmospheric pressure plasma. The process involved air as the working gas, 400W of processing power, 20s of processing time, and a processing interval of 2.5mm. At room temperature, a liquid metal coating of 1.5mm thickness was applied. Dow Corning 184 was selected as the raw material and mixed with a crosslinking agent at a 10:1 mass ratio. The mixture was then uniformly coated onto the fabric surface with the liquid metal coating using a scraping method, achieving a coating thickness of approximately 3mm. The coating was then cured at 120℃ for 60 minutes to produce a flexible, conductive, hydrophobic nylon fabric.

[0061] Example 9

[0062] High-density aramid woven plain weave fabric was used as the flexible material, cut to approximately 10cm x 10cm. Surface activation was performed using atmospheric pressure plasma. The process involved air as the working gas, 300W of processing power, 10s of processing time, and a processing interval of 2.3mm. At room temperature, a "mosquito coil" type mask was used, and liquid metal was brushed onto the activated fabric surface to a thickness of 2mm. Dow Corning 184 was selected as the raw material and mixed with a crosslinking agent at a mass ratio of 10:5. The mixture was then uniformly coated onto the fabric surface with the adhering liquid metal using a scraping method to a thickness of approximately 2mm. The mixture was then cured at 150℃ for 30 minutes to produce a flexible, conductive, hydrophobic aramid fabric.

[0063] Test case

[0064] Surface hydrophobicity test: The hydrophobicity of a material surface is judged by the size of the static water contact angle; the larger the contact angle, the better the hydrophobicity. Test method: Use an OCA15EC contact angle meter, select deionized water as the test liquid, the droplet volume is 5μL, the injection rate is 2μL / s, and each group of samples is tested 5 times, and the average value is taken.

[0065] Conductivity testing includes resistance testing and electrothermal performance testing. Resistance testing involves placing a multimeter with positive and negative probes at both ends of the flexible conductive fabric and observing the multimeter readings. Each sample is tested 5-8 times, and the average value is taken. Electrothermal performance testing involves using a dovetail clip to hold both ends of the fabric, adjusting the voltage at both ends with a DC power supply, and then applying power. A thermal infrared imager is used to test the temperature change on the fabric surface after power is applied, with voltage and temperature measurements taken every 10 seconds.

[0066] In Example 1, the static water contact angle of the fabric surface before and after treatment increased from ≤10° to 143°; in Example 5, the static water contact angle of the fabric surface before and after treatment increased from ≤10° to 132°; in Example 8, the static water contact angle of the fabric surface before and after treatment increased from ≤10° to 121°; the resistance at both ends of the fabric is approximately 1.9Ω.

[0067] like Figure 1 , Figure 2 As shown, in Example 1, the resistance of the fabric at both ends is about 0.5Ω; after applying different voltages to both ends, the surface temperature increases with the increase of voltage, and reaches 115.3℃ at 0.8V. The temperature remains basically unchanged after 1 minute, and gradually decreases after the power is turned off.

[0068] like Figure 3 , Figure 4As shown, in Example 5, the resistance of the fabric at both ends is about 0.2Ω; after applying different voltages to the two ends, the surface temperature increases with the increase of voltage, and reaches 115.3℃ at 0.5V. The temperature remains basically unchanged after 1 minute. After the power is turned off, the temperature gradually decreases.

[0069] like Figure 5 As shown, in Example 8, the static water contact angle of the fabric surface increased from ≤10° to 121° before and after treatment; the resistance at both ends of the fabric was approximately 1.9Ω.

[0070] The results of the above embodiments show that the flexible conductive and hydrophobic materials and their preparation methods provided by this invention, when used to make flexible conductive fabrics, all exhibit relatively stable conductivity and good hydrophobicity after treatment. The surface hydrophobicity of the flexible conductive fabric formed by plasma-induced crosslinking is slightly better than that formed by chemical crosslinking agent-induced crosslinking. This indicates that the atmospheric pressure plasma method for surface pretreatment can effectively solve the problems of uniform dispersion and poor conductivity stability of liquid metal on the material surface. It is simple to operate, effective, and does not affect the overall performance of the material. Using polydimethylsiloxane to coat the material surface not only effectively solves the problem of unstable conductivity caused by the high internal stress and easy accumulation of liquid metal, but also endows the flexible conductive material with certain hydrophobic and waterproof functions, further protecting the material's conductivity stability.

[0071] In this invention, to address the issue of uniform dispersion of liquid metal, an atmospheric pressure plasma method is used to pretreat the surface of fibers / yarns / fabrics using atmospheric pressure plasma. This introduces active groups onto the surface, activating it. The etching process increases surface roughness, thereby enabling uniform distribution of liquid metal on the fiber / yarn / fabric surface. To address the issue of liquid metal agglomeration during use, an organosilicon polymer is attached to its surface and induced to crosslink under the action of plasma or a chemical crosslinking agent to form a coating. This not only effectively prevents the agglomeration of liquid metal on the fiber / yarn surface but also imparts a certain degree of waterproofing to the yarn / fiber, further protecting the material's electrical conductivity. The plasma pretreatment-silicon polymer attachment-induced crosslinking film formation method can directly treat the fiber / yarn surface. The plasma action only treats the surface of the fiber / yarn at a density of tens of nanometers, without affecting the overall performance of the fiber / yarn.

[0072] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for preparing a flexible conductive hydrophobic material, characterized in that, Includes the following steps: Step 1: Activate the flexible fabric by pretreatment with atmospheric pressure plasma; Step 2: Apply liquid metal to the surface of the activated flexible fabric by brushing. Step 3: After coating polydimethylsiloxane onto the flexible surface of the brushed liquid metal, crosslinking is performed to form a film, thereby obtaining the flexible conductive hydrophobic material. In step one, the plasma pretreatment process includes: working gas is air, processing power is 300W, processing time is 50s, and processing spacing is 2.8mm. In step one, the plasma pretreatment process includes: working gas is air, processing power is 500W, processing time is 3s, and processing spacing is 1mm. In step one, the plasma pretreatment process includes: working gas is air, processing power is 400W, processing time is 20s, and processing spacing is 2.5mm. In step one, the plasma pretreatment process includes: working gas is air, processing power is 300W, processing time is 10s, and processing spacing is 2.3mm; In step one, the plasma pretreatment process includes: using a mixture of hydrogen, carbon dioxide, and nitrogen as the working gas; a processing power of 500W; a processing time of 3 seconds; and a processing spacing of 1 mm; or In step one, the plasma pretreatment process includes: the working gas is a nitrogen-oxygen mixture, the processing power is 400W, the processing time is 20s, and the processing spacing is 2.5mm.

2. The method for preparing the flexible conductive hydrophobic material as described in claim 1, characterized in that, In step two, the coating thickness is controlled to be 0.1–4 mm.

3. The method for preparing the flexible conductive hydrophobic material as described in claim 1, characterized in that, In step three, the crosslinking film formation process includes a plasma-induced crosslinking film formation process: polydimethylsiloxane with a viscosity of 1000-10000 cps is selected as the raw material, coated onto the flexible surface of the brush-coated liquid metal, and then placed in a plasma discharge chamber to induce crosslinking film formation.

4. The method for preparing the flexible conductive hydrophobic material as described in claim 3, characterized in that, Processing parameters for inducing cross-linking film formation in a plasma discharge cavity: The plasma discharge device is capacitively coupled and inductively coupled discharge, and can be classified into one of DC, pulse, low-frequency, and radio frequency plasma discharge according to the discharge frequency; The reactant gases are argon, helium, oxygen, and air, or a mixture of one or more of these gases; and The power is 50-500W, the modulation pulse is 2%-100%, the processing time is 20-300s, and the processing interval is 1-12cm.

5. The method for preparing the flexible conductive hydrophobic material as described in claim 1, characterized in that, In step three, the crosslinking film formation process includes a chemical crosslinking agent crosslinking film formation process: hydroxyl-terminated polydimethylsiloxane with a viscosity of 1000-4000 cps is selected as the raw material, tetraethyl orthosilicate is used as the crosslinking agent, and dioctyltin dilaurate is used as the catalyst. After being scraped onto the flexible surface of the brush-coated liquid metal, it is placed in an oven and heated to crosslink and form a film.

6. The method for preparing the flexible conductive hydrophobic material as described in claim 1, characterized in that, In step three, the crosslinking film formation process includes a chemical crosslinking agent crosslinking film formation process: Dow Corning 184 is selected as the raw material, polydimethylsiloxane and crosslinking agent are thoroughly stirred and mixed, and then coated onto the flexible surface of the brushed liquid metal, and then placed in an oven for heating to crosslink and form a film.

7. The method for preparing the flexible conductive hydrophobic material as described in claim 5 or 6, characterized in that, The crosslinking temperature is 60–150℃, and the crosslinking time is 30–600 min.

8. The method for preparing the flexible conductive hydrophobic material as described in claim 3, 5, or 6, characterized in that, The coating thickness is 0.5–5 mm.

9. A flexible conductive hydrophobic material, characterized in that, The material was prepared using the method for preparing flexible conductive hydrophobic materials as described in any one of claims 1-8.

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