Self-repairing multifunctional super-hydrophobic fabric and preparation method thereof

Abstract

The application discloses a self-repairing multifunctional super-hydrophobic fabric and a preparation method thereof, and belongs to the technical field of functional textile materials. The self-repairing multifunctional super-hydrophobic fabric is prepared by mixing graphene oxide dispersion liquid, hydrophobic long-chain silane with carbon atom number n greater than or equal to 6, water-based polyurethane and disperse dye to form a composite coating solution, and then performing finishing on the fabric by using a one-step dispersion dyeing method, so that a self-repairing multifunctional super-hydrophobic composite coating is formed on the surface of the fabric. During the forming of the composite coating, the graphene oxide is reduced in situ, the water-based polyurethane is used as an adhesive, the hydrophobic long-chain silane agent and the reduced graphene oxide are combined, a rough structure is constructed, the surface free energy is reduced, and the self-repairing multifunctional super-hydrophobic fabric is obtained, and meanwhile, the fabric is dyed. An efficient and clean strategy is provided, and a fluorine-free super-hydrophobic fabric coating which is firm, colorful and has antibacterial and antistatic properties is prepared by using a simple one-step dispersion dyeing process.

Description

Technical Field

[0001] This invention belongs to the field of functional textile materials technology, specifically relating to a self-healing multifunctional superhydrophobic fabric and its preparation method. Background Technology

[0002] Superhydrophobic fabrics have wide applications in self-cleaning, antifogging, antifreeze / fogging / corrosion, drag reduction, antimicrobial growth, and liquid handling. Their preparation methods can be categorized into physical methods (such as dip coating, vapor deposition, spraying, self-assembly, and photolithography), chemical methods (such as grafting reactions, in-situ polymerization, electrochemical deposition, and crosslinking), or a combination of both. Generally, most superwetting coatings are not durable against chemical and mechanical damage, such as chemical / solvent attack, UV radiation, extreme conditions, prolonged washing, and abrasion. Significant efforts have been devoted to improving coating durability, for example, by bonding functional layers and substrates through crosslinking or chemical grafting, constructing layered structures on the substrate surface, utilizing robust elastic nanocomposite coatings, and designing self-healing coatings. Fluorinated surfactants have been widely used to reduce surface free energy and enhance surface superhydrophobicity, but they have been found to pose potential health and environmental hazards. Therefore, the development of fluorine-free superhydrophobic coatings has been a major focus.

[0003] In recent years, fabrics with different colors and superhydrophobic properties have begun to attract great attention due to their perfect combination of function and aesthetics. A two-step coating method was used to prepare colored superhydrophobic cotton fabrics, employing natural tannins as dyes and trimethoxysilane, the alkoxy-silane precursor phenyltriethoxysilane, and n-octyltrimethoxysilane as coating materials. Existing technologies disclose superhydrophobic colored polyester fabrics, which involve pre-treating the fabric under alkali reduction to form a rough surface, followed by dyeing and heat aging at 130°C for 24 hours. However, due to the high temperature and pressure of the disperse dyeing system, it is difficult to precisely control the physical / chemical reactions involved. Highly durable one-step multifunctional dyeing is highly anticipated but often difficult to achieve. Furthermore, the surface processing of multifunctional fabrics undoubtedly involves multiple processing steps, the application of different equipment and the use of various materials, inevitably generating additional wastewater discharge and consuming more power. Based on this, the present invention provides a green one-step strategy to prepare strong, colored, fluorine-free, antibacterial, antistatic, and self-healing superhydrophobic fabrics through a simple one-step disperse dyeing process. Summary of the Invention

[0004] The purpose of this invention is to address the problems of poor durability, cumbersome coating processes, and toxicity caused by additional chemical treatments in existing superhydrophobic fabrics. This invention provides a self-healing multifunctional superhydrophobic fabric and its preparation method. The fabric is treated with a one-step disperse dyeing method to form a self-healing antibacterial and antistatic superhydrophobic composite coating on the fabric surface. The composite coating contains waterborne polyurethane (WPU) resin such as silicone-modified waterborne polyurethane, hydrophobic long-chain silanes such as hexadecyltrimethoxysilane (HDTMS), graphene oxide (GO), and disperse dyes.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] The first objective of this invention is to provide a method for preparing a self-healing, multifunctional superhydrophobic fabric, comprising the following steps:

[0007] A composite coating solution is formed by mixing graphene oxide dispersion, hydrophobic long-chain silanes with n≥6 carbon atoms, waterborne polyurethane, and disperse dyes. A one-step disperse dyeing method is used to reduce and finish the fabric, forming a self-healing antibacterial and antistatic superhydrophobic composite coating on the fabric surface. During the formation of the composite coating, graphene oxide is reduced in situ, and waterborne polyurethane acts as a binder to combine the hydrophobic long-chain silanes and reduced graphene oxide, constructing a rough structure and reducing surface free energy, thereby obtaining a self-healing multifunctional superhydrophobic fabric.

[0008] Furthermore, the ratio of graphene oxide dispersion, hydrophobic long-chain silane, and waterborne polyurethane is 30 mL: 0.1-1.0 g: 0.5-1.0 g.

[0009] Furthermore, the hydrophobic long-chain silane is a silane coupling agent with n≥6 carbon atoms, and the waterborne polyurethane is an organosilicon-modified waterborne polyurethane.

[0010] Furthermore, the mass ratio of the disperse dye to the waterborne polyurethane is 1-5:20.

[0011] Furthermore, the concentration of the graphene oxide dispersion is 2-3 g / L.

[0012] Furthermore, the fabric is a fiber fabric that can be dyed with disperse dyes.

[0013] Furthermore, during the restoration process, the fabric is immersed in a composite coating solution, first heated to 50-70℃, then heated to 120-150℃ and held for 60 minutes. After the holding period, it is rotated at 60 r / min to cool to room temperature and then dried to obtain a self-healing multifunctional superhydrophobic fabric.

[0014] Furthermore, the heating rate to 50-70℃ is 5-10℃ / min, the heating rate to 120-150℃ is 2-3℃ / min, the pressure is 280-295KPa, and the cooling rate to room temperature is 5℃ / min.

[0015] The second objective of this invention is to provide a method for preparing a self-healing, multifunctional superhydrophobic fabric.

[0016] Furthermore, the superhydrophobic fabric exhibits self-healing properties under thermal induction.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) This invention uses a mixture of graphene oxide dispersion, hydrophobic long-chain silane such as hexadecyltrimethoxysilane (HDTMS), waterborne polyurethane (WPU) resin such as organosilicon-modified waterborne polyurethane, and disperse dyes to form a composite coating (reduced graphene oxide / HDTMS / WPU / composite coating) solution. A one-step disperse dyeing method is used to reduce and finish the fabric. The disperse dyeing treatment under high temperature / high pressure can not only form a multifunctional coating that is firmly bonded to the fabric surface, but also realize the in-situ reduction of graphene oxide and fabric dyeing. A self-healing antibacterial and antistatic superhydrophobic composite coating is formed on the fabric surface. During the formation of the composite coating, WPU is stably attached to the fabric surface as a strong hydrophobic coating matrix and acts as an adhesive to fix the reduced graphene oxide / HDTMS. The miniaturized reduced graphene oxide and hydrophobic long-chain silane such as HDTMS further increase the surface roughness, reduce the surface free energy, and improve the surface superhydrophobicity, thereby obtaining a self-healing multifunctional superhydrophobic fabric.

[0019] (2) This invention provides an efficient and clean strategy for preparing a robust, colored, fluorine-free, antibacterial, and antistatic superhydrophobic fabric coating through a simple one-step dispersion dyeing process. The method is simple to operate, highly controllable, and widely applicable. The preparation process does not involve any toxic or harmful reagents or gases, making it green and environmentally friendly. Furthermore, the product exhibits excellent uniformity and reproducibility, demonstrating high application potential in achieving green production of functional fabrics.

[0020] (3) After the present invention forms a self-healing antibacterial and antistatic superhydrophobic composite coating on the fabric surface, the superhydrophobic fabric has a water contact angle (WCA) > 155°, exhibits good liquid repellency against various aqueous solutions, endows the fabric with self-cleaning properties, and has significantly high stability against washing, abrasion, acid and alkali attack, high temperature and extremely low temperature (i.e., liquid nitrogen) treatment. In addition, the superhydrophobic composite coating also exhibits self-healing ability against chemical damage, and the reduced graphene oxide in the coating matrix gives the fabric antistatic and antibacterial capabilities against Staphylococcus aureus (antibacterial rate exceeding 98%). Attached Figure Description

[0021] Figure 1 This invention relates to the dye coating mechanism of the self-healing multifunctional superhydrophobic fabric.

[0022] Figure 2 This is a process diagram illustrating the preparation of the superhydrophobic fabric of this invention.

[0023] Figure 3 The images shown are scanning electron microscope (SEM) images and hydrophobic property diagrams of the superhydrophobic fabric of this invention. Figure 3 In the diagram, a is a scanning electron microscope image, b is a water droplet image on the treated fabric, c is various aqueous phase droplet images, d is a physical image of Example 1, e is a physical image of Example 2, f is a physical image of Example 3, g is a physical image of Example 4, h is a physical image of Example 5, and i is a physical image of Example 6.

[0024] Figure 4 The images show the XRD patterns of graphene oxide sheets before and after dispersion staining treatment according to the present invention.

[0025] Figure 5 This is the X-ray photoelectron spectrum of the superhydrophobic fabric dyeing treatment in Example 1 of the present invention. Figure 5 In the diagram, a is the XPS full spectrum, b is the C 1s spectrum, c is the Si 2p spectrum, d is the N 1s spectrum, e is the EDX scatter plot of C, f is the EDX scatter plot of O, g is the EDX scatter plot of N, and h is the EDX scatter plot of Si.

[0026] Figure 6 The images show the superhydrophobicity of the superhydrophobic fabric in Example 1 of this invention after repeated washing cycles, and the scanning electron microscope images after the cycles. Figure 6 In the figure, a represents the superhydrophobicity after repeated washing cycles, b represents the scanning electron microscope result after 100 washing cycles, and c represents the staining fastness after washing cycles.

[0027] Figure 7 This is a diagram illustrating the abrasion resistance of the superhydrophobic fabric of Example 1 of the present invention. Figure 7 In the figure, a represents the effect of wear cycle on superhydrophobicity, b represents the scanning electron microscope image after 2000 wear cycles, and c represents the staining fastness after wear.

[0028] Figure 8 The diagram shows the hydrophobic properties of the superhydrophobic fabric of Example 1 of the present invention after immersion in an organic solvent.

[0029] Figure 9 This is a diagram showing the hydrophobic properties of the superhydrophobic fabric in Example 5 of the present invention under ultraviolet irradiation.

[0030] Figure 10 The graphs show the hydrophobic properties and color fastness of the superhydrophobic fabric in Example 5 of this invention under ultrasonic treatment. Figure 10In the figure, a represents the hydrophobic properties under ultrasonic treatment, and b represents the color fastness of the fabric after 30 minutes of ultrasonic treatment.

[0031] Figure 11 The graphs show the hydrophobic properties of the superhydrophobic fabric of Example 5 of the present invention at high and low temperatures. Figure 11 In step a, heating at 180℃ for 30 minutes and step b, freezing in liquid nitrogen for 3 minutes.

[0032] Figure 12 The graphs show the electrostatic voltage and half-life properties of the superhydrophobic fabric before and after treatment in Example 1 of this invention. Figure 12 In this context, 'a' represents static voltage and 'b' represents half-life.

[0033] Figure 13 This is a diagram showing the antibacterial properties of the superhydrophobic fabric in Example 1 of the present invention.

[0034] Figure 14 This is a diagram illustrating the self-healing properties of the superhydrophobic fabric in Embodiment 1 of the present invention. Figure 14 In the diagram, 'a' represents vacuum plasma treatment, 'b' represents plasma treatment followed by heating at 150°C for 10 minutes, and 'c' represents repeated plasma heating cycles. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] It should be noted that the technical terms used in this invention are for the purpose of describing specific embodiments only and are not intended to limit the scope of protection of this invention. Unless otherwise specified, all raw materials, reagents, instruments, and equipment used in the following embodiments of this invention can be purchased commercially or prepared by existing methods. In this invention, polyester fabric (PET, plain weave, 160g / m²) 2 Provided by the National Dyeing and Finishing Innovation Center. Hexadecyltrimethoxysilane (HTDMS, H3C(CH2)) 15 Si(OCH3)3 (85%) and anhydrous ethanol (≥99.7%) were supplied by Shanghai Mscklin Biotechnology Co., Ltd. Silicone-modified waterborne polyurethane (WPU) was purchased from Tianjin Qisheng Trading Co., Ltd. Graphene oxide (6.0 g / L water-borne dispersant) was supplied by the National Dyeing and Finishing Innovation Center. Disperse dyes, such as Black SE-2R, Navy Blue S-2R, Red S-BR, Blue SE-2R, Brown S-2RFLN, and Violet S-FRL, were supplied by Yorkshire Chemicals Holdings Ltd.

[0037] Multifunctional superhydrophobic fabrics have enormous application potential in daily life. In recent years, physical methods (such as dip coating, vapor deposition, spraying, etc.), chemical methods (such as grafting reaction, in-situ polymerization, electrochemical deposition, etc.), or a combination of both have been used to form superwetting coatings on the surface of fabrics. However, the chemical and mechanical damage is not lasting, and the coating process is also cumbersome. While using fluorinated surfactants can reduce surface free energy and enhance surface superhydrophobicity, it requires the use of solvents that are harmful to humans and the environment, or the generation of toxic and harmful gases. Therefore, it is particularly important to research and develop a fast, environmentally friendly, and durable finishing method for superhydrophobic fabrics.

[0038] In recent years, graphene materials have attracted widespread attention due to their excellent low density, high electrical conductivity, flexibility, and superior thermal and chemical stability. Some synthetic fibers suffer from surface static electricity buildup, negatively impacting wearing comfort. Microbial adhesion and proliferation on fabrics can lead to unpleasant odors, stains, discoloration, and even pathogen infections, affecting human health; therefore, endowing fabrics with antibacterial properties is of great significance. The application of graphene materials in coatings provides antistatic and bactericidal functions. However, directly dispersing graphene in coating solutions results in uneven and unstable dispersion, and because graphene itself is black, it cannot dye fabrics in different colors, limiting its application.

[0039] Based on this, the present invention provides a green one-step strategy for easily preparing colored, multifunctional, fluorine-free superhydrophobic coatings on fabrics using traditional dispersion dyeing methods. This one-step multifunctional coating strategy exhibits advantages such as energy saving, emission reduction, reduced carbon footprint, and environmental protection. It is ideal for the simple manufacturing of fabric coatings and provides an application for preparing durable, multifunctional colored fabrics through traditional dispersion dyeing processes. It has great application potential in realizing the green production of functional fabrics.

[0040] On one hand, the present invention provides a method for preparing a self-healing multifunctional superhydrophobic fabric, comprising the following steps:

[0041] A composite coating solution is formed by mixing graphene oxide dispersion, hydrophobic long-chain silanes with n≥6 carbon atoms, waterborne polyurethane, and disperse dyes. A one-step disperse dyeing method is used to reduce and finish the fabric, forming a self-healing antibacterial and antistatic superhydrophobic composite coating on the fabric surface. During the formation of the composite coating, graphene oxide is reduced in situ, and waterborne polyurethane acts as a binder to combine the hydrophobic long-chain silanes and reduced graphene oxide, constructing a rough structure and reducing surface free energy, thereby obtaining a self-healing multifunctional superhydrophobic fabric.

[0042] This invention uses a composite coating solution formed by mixing graphene oxide dispersion, hexadecyltrimethoxysilane, aqueous polyurethane, and disperse dyes. A one-step disperse dyeing method is used to reduce and finish the fabric. The disperse dyeing treatment under high temperature / high pressure not only forms a multifunctional coating that is firmly bonded to the fabric surface, but also achieves in-situ reduction of graphene oxide and dyeing of the fabric. A self-healing antibacterial, antistatic, and superhydrophobic composite coating is formed on the fabric surface. During the formation of the composite coating, WPU acts as a robust hydrophobic coating matrix that is stably attached to the fabric surface and acts as an adhesive to fix the reduced graphene oxide / HDTMS. The miniaturized reduced graphene oxide and long carbon chain HDTMS further increase the surface roughness, reduce the surface free energy, and improve the surface superhydrophobicity, thereby obtaining a self-healing multifunctional superhydrophobic fabric.

[0043] Figure 1 This describes the dye coating mechanism of the self-healing multifunctional superhydrophobic fabric of the present invention. For example... Figure 1 As shown, due to the high temperature and pressure during the disperse dyeing process, hydrophobic disperse dyes easily separate from the bath solution, migrate to the surface of hydrophobic polyester fibers, and deposit, eventually diffusing into the fibers, exhibiting vibrant colors. Simultaneously, graphene oxide flakes are successfully reduced to reduced graphene oxide and uniformly dispersed in the solution. When the dyed fabric is removed from the solution, a thin layer of reduced graphene oxide / HDTMS / WPU / composite coating solution remains on the surface, forming a durable, multifunctional coating. During the heating process at 150°C, WPU plays a crucial role in matrix fixation of the reduced graphene oxide / HDTMS / dye molecules and firmly adhering the coating surface. Reduced graphene oxide increases the surface roughness of the coating while also imparting antistatic and antibacterial properties. The low surface energy of HDTMS in the coating and the layered surface of the coating make it superhydrophobic. Furthermore, HDTMS molecules enable the coating to exhibit self-healing properties because they can migrate to the surface under heat treatment, replacing hydrophilic groups caused by chemical damage and further reducing the surface energy.

[0044] This invention provides an efficient and clean strategy for preparing a robust, colored, fluorine-free, superhydrophobic fabric coating with antibacterial and antistatic properties through a simple one-step dispersion dyeing process. The method is simple to operate, highly controllable, and widely applicable. The preparation process does not involve any toxic or harmful reagents or gases, making it environmentally friendly. Furthermore, the product exhibits excellent uniformity and reproducibility, demonstrating high application potential in the green production of functional fabrics.

[0045] In one specific embodiment, the ratio of the graphene oxide dispersion, hydrophobic long-chain silane, and aqueous polyurethane is 30 mL: 0.1-1.0 g: 0.5-1.0 g. In this invention, within a certain range, a higher amount of graphene oxide improves conductivity and antibacterial properties. However, since graphene oxide is reduced to form reduced graphene oxide, which is inherently colored, increasing the amount of graphene oxide increases the dyeing effect on fabrics. Furthermore, during the high-temperature / high-pressure dispersion dyeing process, partial reduction occurs, resulting in uneven and unstable dispersion, making it impossible to dye fabrics in different colors and limiting their application.

[0046] In one specific embodiment, the hydrophobic long-chain silane is a silane coupling agent with a carbon atom number n≥6, and the waterborne polyurethane is an organosilicon-modified waterborne polyurethane. In this invention, the silane coupling agent can be one or two of hexadecyltrimethoxysilane (HDTMS), polydimethylsiloxane (PDMS), octadecyltrichlorosilane (OTS), octadecylamine (ODA), silicone oil, etc., with the aim of increasing surface roughness, reducing surface free energy, and improving surface superhydrophobicity. Preferably, the silane coupling agent is HDTMS. HDTMS molecules enable the coating to exhibit self-healing properties because they can migrate to the surface under heat treatment, replacing hydrophilic groups caused by chemical damage, and further reducing surface energy. The waterborne polyurethane can also be other hydrophobic, fluorine-free waterborne polyurethanes, which serve as a robust hydrophobic coating matrix stably adhered to the fabric surface and as an adhesive to fix reduced graphene oxide / HDTMS.

[0047] In one specific embodiment, the mass ratio of the disperse dye to the waterborne polyurethane is 1-5:20. In this invention, a one-step disperse dyeing process is used to reduce and finish the fabric to prepare a colored, multifunctional, fluorine-free superhydrophobic coating. The amount of disperse dye can be determined and optimized according to the actual needs of the fabric's dyeing degree. The mass ratio of the disperse dye to the waterborne polyurethane can be any ratio between 1 and 5:20, such as 1:20, 2:20, 3:20, 4:20, or 5:20.

[0048] In one specific embodiment, the concentration of the graphene oxide dispersion is 2-3 g / L. In this invention, during the dispersion dyeing process under high temperature / high pressure, the graphene oxide dispersion is successfully reduced to reduced graphene oxide and uniformly dispersed in the solution, playing a certain dyeing role on the fabric. A multifunctional coating is formed by WPU fixation. The reduced graphene oxide improves the surface roughness of the coating and simultaneously gives the coating antistatic and antibacterial properties. Preferably, the preparation method of the graphene oxide dispersion includes the following steps: adding water to the graphene oxide dispersion, mixing evenly, then adding ethanol, mixing evenly to obtain the graphene oxide dispersion; the graphene oxide concentration is 6.0 g / L; the volume ratio of the graphene oxide dispersion, water, and ethanol is 9:18:3.

[0049] In one specific embodiment, the fabric is a fiber fabric that can be dyed with disperse dyes. In this invention, the fiber fabric is not specifically limited, as long as it is a fiber fabric that can be dyed with disperse dyes and a stable coating is formed on the surface of the fiber fabric. Preferably, the fiber fabric is polyester.

[0050] In one specific embodiment, the fabric is immersed in a composite coating solution, first heated to 50-70°C, then heated to 120-150°C and held for 60 minutes. After the heating is completed, it is cooled to room temperature at 60 r / min and dried to obtain a self-healing multifunctional superhydrophobic fabric. The heating rate to 50-70°C is 5-10°C / min, the heating rate to 120-150°C is 2-3°C / min, the pressure is 280-295 kPa, and the cooling rate to room temperature is 5°C / min. In this invention, the disperse dyeing method is conventional disperse dye dyeing, which uses conventional dyeing temperature and pressure, without the need for additional dyeing steps, and is compatible with various conventional dyeing equipment. This provides many possibilities for preparing durable multifunctional colored fabrics through traditional disperse dyeing processes and has high application potential in realizing the green production of functional fabrics.

[0051] On the other hand, this invention provides a self-healing multifunctional superhydrophobic fabric. The superhydrophobic fabric has a water contact angle (WCA) > 155°, exhibits excellent liquid repellency to various aqueous solutions, endows the fabric with self-cleaning properties, and demonstrates significantly high stability against washing, abrasion, acid and alkali attacks, and high and extremely low temperature (i.e., liquid nitrogen) treatments. Furthermore, when its superhydrophobicity is damaged by physicochemical processes, its original hydrophobicity can be restored using a simple heating process; that is, the superhydrophobic fabric exhibits self-healing properties under thermal induction, demonstrating a self-healing ability against chemical damage. The reduced graphene oxide in the coating matrix gives the fabric antistatic and antibacterial capabilities against Staphylococcus aureus (antibacterial rate exceeding 98%).

[0052] The following specific examples will provide further explanation.

[0053] Example 1

[0054] A method for preparing a self-healing multifunctional superhydrophobic fabric includes the following steps:

[0055] S1. Add 9 mL of graphene oxide dispersion to 18 mL of distilled water and stir for 5 min. Then slowly add 3 mL of ethanol to the prepared graphene oxide dispersion and stir for another 5 min. Then magnetically stir for 10 min to form a graphene oxide dispersion.

[0056] S2. Add hexadecyltrimethoxysilane (HDTMS) and organosilicon waterborne polyurethane (WPU) sequentially to 30 mL of graphene oxide dispersion to obtain a functionally uniform graphene oxide / HDTMS / WPU coating solution. To prepare a colored functional coating solution, add 0.03 g of disperse dye black SE-2R to the obtained GO / HDTMS / WPU / dye composite coating solution.

[0057] S3. Immerse a 5cm × 5cm piece of polyester fabric (PET) in a dyeing machine containing a 30mL GO / HDTMS / WPU / dye composite coating solution. To ensure uniform dyeing, the dyeing bath temperature is rapidly increased to 70℃ (heating rate 5℃ / min), then gradually increased to 130℃ (heating rate 2℃ / min), and finally maintained at 130℃ for 60min. The steam pressure inside the container is approximately 280-295kPa. After dyeing, the container temperature is lowered to room temperature at a cooling rate of 5℃ / min. During cooling, the container rotates at a speed of 60r / min. The treated fabric is thoroughly rinsed with tap water to remove any floating redundant coating, and then dried at 150℃ for 30min to obtain a self-healing multifunctional superhydrophobic fabric.

[0058] Example 2

[0059] A method for preparing a self-healing multifunctional superhydrophobic fabric includes the following steps:

[0060] S1. Add 9 mL of graphene oxide dispersion to 18 mL of distilled water and stir for 5 min. Then slowly add 3 mL of ethanol to the prepared graphene oxide dispersion and stir for another 5 min. Then magnetically stir for 10 min to form a graphene oxide dispersion.

[0061] S2. Add hexadecyltrimethoxysilane (HDTMS) and organosilicon waterborne polyurethane (WPU) sequentially to 30 mL of graphene oxide dispersion to obtain a functionally uniform graphene oxide / HDTMS / WPU coating solution. To prepare a colored functional coating solution, add 0.03 g of disperse dye Navy Blue S-2R to the obtained GO / HDTMS / WPU / dye composite coating solution.

[0062] S3. Immerse a 5cm × 5cm piece of polyester fabric (PET) in a dyeing machine containing a 30mL GO / HDTMS / WPU / dye composite coating solution. To ensure uniform dyeing, the dyeing bath temperature is rapidly increased to 70℃ (heating rate 5℃ / min), then gradually increased to 130℃ (heating rate 2℃ / min), and finally maintained at 130℃ for 60min. The steam pressure inside the container is approximately 280-295kPa. After dyeing, the container temperature is lowered to room temperature at a cooling rate of 5℃ / min. During cooling, the container rotates at a speed of 60r / min. The treated fabric is thoroughly rinsed with tap water to remove any floating redundant coating, and then dried at 150℃ for 30min to obtain a self-healing multifunctional superhydrophobic fabric.

[0063] Example 3

[0064] A method for preparing a self-healing multifunctional superhydrophobic fabric includes the following steps:

[0065] S1. Add 9 mL of graphene oxide dispersion to 18 mL of distilled water and stir for 5 min. Then slowly add 3 mL of ethanol to the prepared graphene oxide dispersion and stir for another 5 min. Then magnetically stir for 10 min to form a graphene oxide dispersion.

[0066] S2. Add hexadecyltrimethoxysilane (HDTMS) and organosilicon waterborne polyurethane (WPU) sequentially to 30 mL of graphene oxide dispersion to obtain a functionally uniform graphene oxide / HDTMS / WPU coating solution. To prepare a colored functional coating solution, add 0.03 g of disperse dye red S-BR to the obtained GO / HDTMS / WPU / dye composite coating solution.

[0067] S3. Immerse a 5cm × 5cm piece of polyester fabric (PET) in a dyeing machine containing a 30mL GO / HDTMS / WPU / dye composite coating solution. To ensure uniform dyeing, the dyeing bath temperature is rapidly increased to 70℃ (heating rate 5℃ / min), then gradually increased to 130℃ (heating rate 2℃ / min), and finally maintained at 130℃ for 60min. The steam pressure inside the container is approximately 280-295kPa. After dyeing, the container temperature is lowered to room temperature at a cooling rate of 5℃ / min. During cooling, the container rotates at a speed of 60r / min. The treated fabric is thoroughly rinsed with tap water to remove any floating redundant coating, and then dried at 150℃ for 30min to obtain a self-healing multifunctional superhydrophobic fabric.

[0068] Example 4

[0069] A method for preparing a self-healing multifunctional superhydrophobic fabric includes the following steps:

[0070] S1. Add 9 mL of graphene oxide dispersion to 18 mL of distilled water and stir for 5 min. Then slowly add 3 mL of ethanol to the prepared graphene oxide dispersion and stir for another 5 min. Then magnetically stir for 10 min to form a graphene oxide dispersion.

[0071] S2. Add hexadecyltrimethoxysilane (HDTMS) and organosilicon waterborne polyurethane (WPU) sequentially to 30 mL of graphene oxide dispersion to obtain a functionally uniform graphene oxide / HDTMS / WPU coating solution. To prepare a colored functional coating solution, add 0.03 g of disperse dye blue SE-2R to the obtained GO / HDTMS / WPU / dye composite coating solution.

[0072] S3. Immerse a 5cm × 5cm piece of polyester fabric (PET) in a dyeing machine containing a 30mL GO / HDTMS / WPU / dye composite coating solution. To ensure uniform dyeing, the dyeing bath temperature is rapidly increased to 70℃ (heating rate 5℃ / min), then gradually increased to 130℃ (heating rate 2℃ / min), and finally maintained at 130℃ for 60min. The steam pressure inside the container is approximately 280-295kPa. After dyeing, the container temperature is lowered to room temperature at a cooling rate of 5℃ / min. During cooling, the container rotates at a speed of 60r / min. The treated fabric is thoroughly rinsed with tap water to remove any floating redundant coating, and then dried at 150℃ for 30min to obtain a self-healing multifunctional superhydrophobic fabric.

[0073] Example 5

[0074] A method for preparing a self-healing multifunctional superhydrophobic fabric includes the following steps:

[0075] S1. Add 9 mL of graphene oxide dispersion to 18 mL of distilled water and stir for 5 min. Then slowly add 3 mL of ethanol to the prepared graphene oxide dispersion and stir for another 5 min. Then magnetically stir for 10 min to form a graphene oxide dispersion.

[0076] S2. Add hexadecyltrimethoxysilane (HDTMS) and organosilicon waterborne polyurethane (WPU) sequentially to 30 mL of graphene oxide dispersion to obtain a functionally uniform graphene oxide / HDTMS / WPU coating solution. To prepare a colored functional coating solution, add 0.03 g of disperse dye violet S-FRL to the obtained GO / HDTMS / WPU / dye composite coating solution.

[0077] S3. Immerse a 5cm × 5cm piece of polyester fabric (PET) in a dyeing machine containing a 30mL GO / HDTMS / WPU / dye composite coating solution. To ensure uniform dyeing, the dyeing bath temperature is rapidly increased to 70℃ (heating rate 5℃ / min), then gradually increased to 130℃ (heating rate 2℃ / min), and finally maintained at 130℃ for 60min. The steam pressure inside the container is approximately 280-295kPa. After dyeing, the container temperature is lowered to room temperature at a cooling rate of 5℃ / min. During cooling, the container rotates at a speed of 60r / min. The treated fabric is thoroughly rinsed with tap water to remove any floating redundant coating, and then dried at 150℃ for 30min to obtain a self-healing multifunctional superhydrophobic fabric.

[0078] Example 6

[0079] A method for preparing a self-healing multifunctional superhydrophobic fabric includes the following steps:

[0080] S1. Add 9 mL of graphene oxide dispersion to 18 mL of distilled water and stir for 5 min. Then slowly add 3 mL of ethanol to the prepared graphene oxide dispersion and stir for another 5 min. Then magnetically stir for 10 min to form a graphene oxide dispersion.

[0081] S2. Add hexadecyltrimethoxysilane (HDTMS) and organosilicon waterborne polyurethane (WPU) sequentially to 30 mL of graphene oxide dispersion to obtain a functionally uniform graphene oxide / HDTMS / WPU coating solution. To prepare a colored functional coating solution, add 0.03 g of disperse dye brown S-2RFLN to the obtained GO / HDTMS / WPU / dye composite coating solution.

[0082] S3. Immerse a 5cm × 5cm piece of polyester fabric (PET) in a dyeing machine containing a 30mL GO / HDTMS / WPU / dye composite coating solution. To ensure uniform dyeing, the dyeing bath temperature is rapidly increased to 70℃ (heating rate 5℃ / min), then gradually increased to 130℃ (heating rate 2℃ / min), and finally maintained at 130℃ for 60min. The steam pressure inside the container is approximately 280-295kPa. After dyeing, the container temperature is lowered to room temperature at a cooling rate of 5℃ / min. During cooling, the container rotates at a speed of 60r / min. The treated fabric is thoroughly rinsed with tap water to remove any floating redundant coating, and then dried at 150℃ for 30min to obtain a self-healing multifunctional superhydrophobic fabric.

[0083] Figure 2 This is a process diagram illustrating the preparation of the superhydrophobic fabric of this invention. (See diagram below.) Figure 2 As shown, a functional coating solution was prepared by adding HDTMS and WPU to a graphene oxide dispersion solution using magnetic stirring. Adding disperse dyes to the prepared graphene oxide / HDTMS / WPU solution allowed for the creation of a specific coating color. The obtained graphene oxide / HDTMS / WPU / dye solution maintained high stability even after two weeks of storage under ambient conditions, without precipitation. The solution was then applied to polyester fabric via a disperse dyeing process at 130°C for 60 minutes, forming a durable coating of the predetermined color with superhydrophobic, antibacterial, and antistatic properties, while simultaneously achieving in-situ reduction of graphene oxide within the coating. To determine the in-situ reduction of graphene oxide during the disperse dyeing process, a white polyester fabric was used as a model fabric substrate and treated with the graphene oxide / HDTMS / WPU solution without disperse dyes. The fabric color changed from white to black, which was attributed to the partial reduction of GO promoted by the high-temperature / vapor pressure dyeing process and subsequent heat treatment. In contrast, when the fabric was coated with a graphene oxide / HDTMS / WPU solution and dried under ambient conditions, the fabric turned brown, indicating that the graphene oxide was not reduced.

[0084] Figure 3 The images shown are scanning electron microscope (SEM) images and hydrophobic property diagrams of the superhydrophobic fabric of this invention. Figure 3 In the diagram, 'a' is a scanning electron microscope image, 'b' is an image of water droplets on the treated fabric, 'c' is an image of various aqueous phase droplets, 'd' is a photograph of the actual product of Example 1, 'e' is a photograph of the actual product of Example 2, 'f' is a photograph of the actual product of Example 3, 'g' is a photograph of the actual product of Example 4, 'h' is a photograph of the actual product of Example 5, and 'i' is a photograph of the actual product of Example 6. Figure 3As shown in Figure a, a layered surface can be observed, indicating the formation of a thin reduced graphene oxide / HDTMS / WPU coating on the PET fabric. The resulting high surface roughness enhances the coating's liquid repellency. In contrast, the original fibers exhibit a smooth fibrous morphology. Figure 3 As shown in b, after dyeing, the reduced graphene oxide / HDTMS / WPU coated fabric exhibits superhydrophobicity, with a WCA of 158° and a small SA of only 5; Figure 3 As shown in c, the fabric exhibits excellent liquid repellency to various aqueous solutions, such as hydrochloric acid (pH=1), sodium hydroxide (pH=14), salt water, fruit juice, milk, and coffee, with CAs exceeding 150° and SAs less than 6. When a water jet splashes onto the coated fabric, it immediately splashes away without leaving any water traces on the surface, indicating that the coating has strong liquid repellency properties. This also endows the fabric with self-cleaning characteristics. Furthermore, the fabric still retains satisfactory flexibility. Although the treated fabric is dark in color due to the presence of reduced graphene oxide in the coating, it can still be dyed in different colors. Figure 3 As shown in diagram di, different dark-colored disperse dyes, such as blue, purple, yellow, red, navy blue, and black, have been introduced into the GO / HDTMS / WPU coating system. After dyeing and curing, the synthesized fabrics exhibit different colors, all of which are superhydrophobic, with WCA greater than 155° and SA less than 5.

[0085] The crystal structure of graphene oxide was studied using X-ray diffraction (XRD). Figure 4 These are XRD patterns of the graphene oxide sheets before and after dispersion staining treatment according to the present invention. Figure 4 As shown, there is a characteristic peak at around 11.5°, which represents the typical diffraction mode (001) of the graphene oxide crystal structure; for the treated fabric, there is another peak near 2θ = 15°, which is also considered to be the crystal diffraction peak of graphene oxide

[29] . The characteristic (001) peak disappears, and a broad new peak appears at around 23°, corresponding to (002) diffraction, indicating that the oxygen-containing groups on the graphene oxide basal surface are partially removed and the graphene oxide is partially reduced.

[0086] The surface chemical properties of the fabric treated with reduced graphene oxide / HDTMS / WPU were analyzed using X-ray photoelectron spectroscopy (XPS). Figure 5 This is the X-ray photoelectron spectroscopy spectrum of the superhydrophobic fabric dyeing treatment in Example 1 of the present invention. Figure 5 In the diagram, 'a' represents the full XPS spectrum, 'b' represents the C 1s spectrum, 'c' represents the Si 2p spectrum, 'd' represents the N 1s spectrum, 'e' represents the EDX dispersion of C, 'f' represents the EDX dispersion of O, 'g' represents the EDX dispersion of N, and 'h' represents the EDX dispersion of Si. Figure 5As shown in a, after staining, C, N, O, and Si elements can be observed in the XPS measurement spectrum. The presence of N and Si elements verifies the existence of WPU and HDTMS molecules. Figure 5 In the high-resolution C1s spectrum shown in b, the four peaks with binding energies of CC (284.9 eV, 285.6 eV, 287.1 eV and 289.1 eV) are assigned to CC (CH), CO, C=O and OC=O, respectively. Figure 5 c in the figure shows the high-resolution Si2p spectrum, with peaks at 100.2 eV and 101.6 eV attributed to the Si-C and Si-O bonds in the HDTMS molecule, respectively. Figure 5 In the figure, d represents the N1s spectrum of the treated fabric. The peaks with binding energies of 399.7 eV and 397.9 eV, respectively, indicate the presence of WPU and the NC=O and CN bonds, confirming their existence. The surface chemical composition of the treated fabric was also analyzed by FTIR spectroscopy, and the energy dispersive spectroscopy (EDS) results are shown below. Figure 5 The results from eh and XPS are consistent, indicating that the graphene oxide / HDTMS / WPU coating contains C, O, Si, and N elements, which are uniformly distributed on the surface of the treated fabric, with atomic ratios of 35.98%, 52.12%, 1.07%, and 10.83%, respectively. In contrast, the original fabric contains only C and O elements, with atomic ratios of 47.93% and 52.07%, respectively.

[0087] Washing and abrasion durability tests were conducted on the superhydrophobic fabrics after dyeing. The washing durability tests were performed according to the standard washing procedure specified by the American Association of Textile Chemists and Color Manufacturers (AATCC, Test Method 61-2006, Test No. 2A). All tests were conducted in a standard washing machine equipped with a 500mL stainless steel tank (750mm × 75mm). Fabric samples (5 × 5cm) 2 The fabric was washed in an aqueous solution containing 150 mL. The washing temperature was set at 49°C, and the stirring speed was 40 ± 2 rpm. The standard washing cycle was 45 minutes, equivalent to 5 household washing cycles. The abrasion resistance of the fabric coating was evaluated using a commercial Martindale abrasion tester and the Martindale method (ASTM D4966) under a loading pressure of 9 kPa.

[0088] The color fastness was evaluated using an SW-24E washing fastness instrument and the ISO 105-C10-C10:2001 and ISO 105X-12:2001 standards for color fastness of textiles. Color fastness test: The treated fabric was washed in standard soap solution (5 g / L) at 50°C for 45 min; color fastness was tested under dry and wet rubbing. The dry rubbing method was as follows: The fabric was fixed on a 104 mm rubbing channel, a cylinder (16 mm in diameter) was wrapped with white cotton fabric, a 9 N friction force was applied, and the rubbing finger was moved back and forth 20 times on the fabric fixed on the rubbing channel. For wet rubbing, the fabric was first soaked in distilled water, and then rubbed 20 times under the same conditions as dry rubbing.

[0089] Figure 6 The images show the superhydrophobicity of the superhydrophobic fabric in Example 1 of this invention after repeated washing cycles, and the scanning electron microscope images after the cycles. Figure 6 In the diagram, 'a' represents the superhydrophobicity after repeated washing cycles, 'b' represents the scanning electron microscope result after 100 washing cycles, and 'c' represents the staining fastness after washing cycles. For example... Figure 6 As shown in Figure a, increasing the number of washing cycles results in the WCA remaining almost unchanged, while the SA increases slightly. After 100 washing cycles, the fabric's WCA is still 153.8°, and the SA is 10.5°. Figure 6 As shown in b, the layered coating on the washed fabric showed almost no damage, indicating a strong adhesion between the coating and the fabric matrix; Figure 6 As shown in c, the K / S value of the washed fabric decreased significantly with changes in washing volume, dropping to 19.63 in the first 40 washing cycles. This is because some over-dispersed dye particles remaining on the coating surface were washed away. With further increases in washing cycles to 100, the K / S value decreased only slightly, stabilizing at 18.20, indicating high color fastness.

[0090] Figure 7 This is a diagram showing the abrasion resistance of the superhydrophobic fabric of Example 1 of the present invention. Figure 7 In the diagram, 'a' represents the effect of wear cycles on superhydrophobicity, 'b' shows the scanning electron microscope results after 2000 wear cycles, and 'c' shows the staining fastness after wear. (Example:) Figure 7 As shown in Figure a, the coating also exhibits excellent abrasion resistance, as evaluated based on a Martindale abrasion test under a 9 kPa load. With increasing abrasion cycles, the WCA remains almost unchanged, while the SA increases. After 2000 abrasion cycles, the fabric's WCA is 151.2° and SA is 13.5°. Figure 7 As shown in b, after 2000 abrasion cycles, some fibers on the top surface of the coating are damaged, and part of the coating peels off, leading to an increase in the SA value. However, the unexposed fibers are still firmly covered by the high surface roughness coating, which makes the abraded fabric exhibit superhydrophobicity; as shown in b. Figure 7As shown in c, the effect of abrasion on the color fastness of the coated fabric is illustrated. The K / S value decreases sharply in the first 800 abrasion cycles, and then begins to decrease gradually as the number of abrasion cycles increases to 2000. After 2000 cycles, the K / S value of the fabric is 18.98.

[0091] The coated fabrics were immersed in various solvents (such as hydrochloric acid (pH=1), sodium hydroxide (pH=14), ethanol, N-methylpyridinone (NMP), dimethylformamide (DMF), tetrahydrofuran (THF), and cyclohexane (CYH)) for 24 hours, then rinsed with water and dried under ambient conditions. Figure 8 The image shows the hydrophobic properties of the superhydrophobic fabric of Example 1 of the present invention after immersion in an organic solvent. Figure 8 As shown, all treated fabrics exhibited a WCA greater than 150° and an SA value not greater than 10 for all liquids, maintaining superhydrophobicity. Simultaneously, the K / S values ​​of the treated fabrics showed slight changes, indicating that the coating possessed good colorfastness to chemical attack.

[0092] Furthermore, the colorfastness of the coating to dry and wet rubbing was evaluated according to textile standards ISO 105-C10:2006 and ISO 105X-12:2001. The calculated grayscale evaluation showed that the reduced graphene oxide / HDTMS / WPU / dye composite coating exhibited a colorfastness grade of 4-5, indicating good colorfastness. The coating's superhydrophobicity also remained unaffected by long-term UV exposure.

[0093] Figure 9 The graph shows the hydrophobic properties of the superhydrophobic fabric of Example 5 of the present invention under ultraviolet irradiation. Figure 9 As shown, after 72 hours of irradiation with 365nm ultraviolet light, the fabric still exhibits superhydrophobicity, with a WCA of 152.8° and an SA of 9.4. To further investigate the durability of the coating, the coated fabric was subjected to ultrasonic treatment in tap water.

[0094] Figure 10 The graphs show the hydrophobic properties and color fastness of the superhydrophobic fabric in Example 5 of this invention under ultrasonic treatment. Figure 10 In the figure, a represents the hydrophobic properties under ultrasonic treatment, and b represents the color fastness of the fabric after 30 minutes of ultrasonic treatment. Figure 10 As shown in a, with the extension of ultrasonic treatment time, WCA decreased slightly and SA increased. However, after 30 minutes of ultrasonic treatment, the fabric still maintained superhydrophobicity, with WCA at 153° and SA at 9°. Figure 10 In Figure b, the coated fabric is immersed in water after 30 minutes of ultrasonic treatment. The water is clear and colorless, indicating that the dispersed dye is safely embedded in the coating and that the fabric has extremely high color fastness to ultrasonic treatment.

[0095] Figure 11 The diagram shows the hydrophobic properties of the superhydrophobic fabric in Example 5 of the present invention at high and low temperatures. Figure 11 In step a, heating at 180℃ for 30 minutes, and in step b, freezing with liquid nitrogen for 3 minutes. Figure 11 As shown, the coating is stable under both high and low temperature conditions. After heating at 180°C for 30 minutes and freezing with liquid nitrogen for 3 minutes, the WCA of the coated fabric still exceeds 150° and the color change is not obvious.

[0096] The antibacterial zone and antibacterial activity of the superhydrophobic fabric from Example 1 were evaluated using the AGAR diffusion method after dyeing treatment. Staphylococcus aureus (Gram-positive) was used as the model bacterium. The antibacterial zone was measured after 24 hours of bacterial growth. The antibacterial rate (R, %) was calculated using the following formula:

[0097]

[0098] A and B represent the number of viable bacteria on the fabric before and after coating treatment, respectively, after 24 hours of cultivation.

[0099] According to standard GB / T 12703.1-2008 (Evaluation of electrostatic properties of textiles - Part 1: Static voltage and half-life), the static voltage and half-life of the superhydrophobic fabric of Example 1 were tested on a YG(L)342D electrostatic tester. The discharge voltage was 10kV, the rotation speed was 1500rpm, and the test duration was approximately 30s.

[0100] Due to the presence of conductive reduced graphene oxide flakes, the prepared reduced graphene oxide / HDTMS / WPU / dye coating exhibits good antistatic properties. The electrostatic voltage and half-life of the fabric and the dyed fabric were measured. Figure 12 The graphs show the electrostatic voltage and half-life properties of the superhydrophobic fabric before and after treatment in Example 1 of this invention. Figure 12 In this context, 'a' represents the static voltage, and 'b' represents the half-life. For example... Figure 12 As shown, the original fabric has a standard antistatic voltage of 500V and a half-life of 160s, exhibiting no antistatic properties. After dyeing, the fabric's static voltage is significantly reduced by 130V, and the half-life is only 0.01s. This is because the reduced graphene oxide embedded in the coating establishes numerous conductive channels for electron transport, thereby improving the conductivity of the coated fabric.

[0101] Figure 13 The diagram shows the antibacterial properties of the superhydrophobic fabric in Example 1 of this invention. Figure 13As shown, bacteria grew rapidly on agar plates, indicating that untreated PET did not exhibit antibacterial ability, while most Staphylococcus aureus could be effectively killed by the treated fabric. The antibacterial activity of the coating was calculated using the viable cell counting method (ASTM E2180), and the antibacterial rate of the fabric treated with reduced graphene oxide / HDTMS / WPU / dye was over 98%. Therefore, when Staphylococcus aureus was used as a model bacterium, the GO / HDTMS / WPU / dye composite coating also exhibited good antibacterial properties.

[0102] Figure 14 This is a diagram illustrating the self-healing properties of the superhydrophobic fabric in Embodiment 1 of the present invention. Figure 14 In the diagram, 'a' represents vacuum plasma treatment, 'b' represents heating at 150°C for 10 minutes after plasma treatment, and 'c' represents repeated plasma heating cycles. For example... Figure 14 As shown, after 3 minutes of vacuum plasma treatment, the fabric becomes hydrophilic, and water droplets immediately diffuse into the fabric when WCA is 0. Figure 14 (a) in the text; however, when the plasma-treated fabric was heated at 150°C for 10 min, its superhydrophobicity was restored at a WCA of 153°. Figure 14 (b) This process is repeatable; after 10 plasma / heat treatment cycles, the fabric exhibits superhydrophobicity with a WCA of 151° ( Figure 14 (e in the text)

[0103] In summary, this invention not only enables in-situ reduction of graphene oxide and fabric dyeing during the dyeing process, but also allows for the application of colored, multifunctional composite coatings to the fabric surface. Due to the synergistic effect among all coating materials, the treated fabric exhibits superhydrophobicity, with a WCA exceeding 158° and an SA of 5. In this composite coating system, the microscale reduced graphene oxide possesses high surface roughness, while the hydrophobic WPU acts as a binder, firmly adhering the composite coating to the fabric substrate and combining HDTMS and reduced graphene oxide. The fluorine-free long-chain HDTMS embedded in the WPU matrix reduces the surface free energy, increasing the coating's superhydrophobicity. Furthermore, the uniform dispersion of dyes in the coating imparts different colors with minimal impact on functionality (such as superhydrophobicity, antibacterial properties, and antistatic properties). The developed functional coating exhibits excellent durability against various severe damages and can recover its superhydrophobicity from chemical damage.

[0104] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0105] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for preparing a self-healing multifunctional superhydrophobic fabric, characterized in that, Includes the following steps: A composite coating solution is formed by mixing graphene oxide dispersion, hexadecyltrimethoxysilane, aqueous polyurethane, and disperse dye. The fabric is then subjected to a one-step disperse dyeing method to reduce and finish it, thereby forming a self-healing, antibacterial, antistatic, and superhydrophobic composite coating on the fabric surface. During the formation of the composite coating, graphene oxide is reduced in situ, and aqueous polyurethane acts as a binder to combine hexadecyltrimethoxysilane and reduced graphene oxide, creating a rough structure and reducing surface free energy, thus obtaining a self-healing, multifunctional superhydrophobic fabric. The waterborne polyurethane is an organosilicon-modified waterborne polyurethane; During the restoration process, the fabric is immersed in a composite coating solution, first heated to 50-70℃, then heated to 120-150℃ and held for 60 minutes. After that, it is rotated at 60 r / min to cool to room temperature and dried to obtain a self-healing multifunctional superhydrophobic fabric. The heating rate to 50-70℃ is 5-10℃ / min, the heating rate to 120-150℃ is 2-3℃ / min, the pressure is 280-295KPa, and the cooling rate to room temperature is 5℃ / min.

2. The method for preparing the self-healing multifunctional superhydrophobic fabric according to claim 1, characterized in that, The ratio of the graphene oxide dispersion, hexadecyltrimethoxysilane, and aqueous polyurethane is 30 mL: 0.1-1.0 g: 0.5-1.0 g.

3. The method for preparing the self-healing multifunctional superhydrophobic fabric according to claim 1, characterized in that, The mass ratio of the disperse dye to the waterborne polyurethane is 1-5:

20.

4. The method for preparing the self-healing multifunctional superhydrophobic fabric according to claim 1, characterized in that, The concentration of the graphene oxide dispersion is 2-3 g / L.

5. The method for preparing the self-healing multifunctional superhydrophobic fabric according to claim 1, characterized in that, The fabric is a fiber fabric that can be dyed with disperse dyes.

6. A self-healing, antibacterial, antistatic, multifunctional superhydrophobic fabric is prepared by the preparation method according to any one of claims 1-5.

7. The self-healing multifunctional superhydrophobic fabric according to claim 6, characterized in that, The superhydrophobic fabric exhibits self-healing properties under thermal induction.

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