Integrated Super-elastic, Antibacterial and Waterproof Hierarchical Multifunctional Fabric and Its Preparation Method and Application

Abstract

Integrated Superelastic Antibacterial Waterproof Hierarchical Multifunctional Fabric and Its Preparation Method and Application. The present invention belongs to the field of multifunctional intelligent fabric preparation. The purpose of the present invention is to solve the technical problems of the existing skin-friendly flexible electronic devices being airtight, impermeable to moisture, waterproof, having poor antibacterial properties, and having a single function. The present invention uses a thermoplastic nonwoven fabric with high elasticity and low Young's modulus prepared by electrospinning as a breathable and moisture-permeable substrate material and a circuit isolation layer, loads antibacterial nanoparticles on the near-skin fabric layer to maintain a healthy microenvironment during long-term skin contact, and prints two kinds of liquid metal circuits thereon to detect human strain signals and physiological electrical signals respectively; a liquid metal heating circuit is printed on the intermediate layer to achieve the function of thermotherapy; the outermost encapsulation layer is modified with superhydrophobic nanoparticles to protect the internal circuit from environmental moisture erosion. Finally, a multifunctional fabric integrating multiple functions with excellent wearing comfort and weather resistance is obtained.

Description

Technical Field

[0001] The present invention belongs to the field of multifunctional intelligent fabrics and their preparation, and particularly relates to an integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric, its preparation method and application. Background Art

[0002] With the continuous development of the wearable electronics industry and the increasing attention of people to personal health issues, the academic and industrial communities have been paying more and more attention to flexible electronic devices. Among them, wearable epidermal electronic devices with skin-like modulus, high elasticity and multifunctional integration (including wearing comfort, antibacterial performance, protective performance, intelligent response performance, monitoring performance of human physiological signals, etc.) can be directly attached to the human skin to monitor motion signals and physiological electrical signals (such as electromyogram, electrocardiogram, electroencephalogram, etc.) in real time, overcoming the defects of traditional rigid metal electrodes with low flexibility and poor skin-friendliness, and having great application prospects in the fields of medical devices, wearable electronics and human-computer interaction.

[0003] Flexible and stretchable epidermal electrodes are generally prepared by compounding elastic polymers and conductive materials. There are mainly three categories of conductive materials. Among them, carbon materials have good conductivity and low price but poor ductility; although conductive polymer materials have good ductility, their conductivity is relatively poor and they are not very environmentally friendly. In contrast, eutectic gallium-indium liquid metal not only has extremely high conductivity, infinite ductility and fluidity, but also has the advantages of non-toxicity and good biocompatibility, and is an ideal conductive material for preparing skin-attached flexible electronic devices.

[0004] Existing flexible and stretchable wearable electronic devices are mostly made of airtight and moisture-impermeable polymer films, and most of them do not consider the antibacterial performance of the devices. Long-term wearing will cause health problems such as skin inflammation and swelling due to sweat accumulation. In addition, the weather resistance of polymer-based flexible electronic devices is generally poor. When liquid invades the inner circuit, it will cause short circuit, seriously affecting the service life of electronic devices. Therefore, while pursuing the overall performance of wearable electronic devices, how to ensure wearing comfort and weather resistance is a key problem to be solved in the preparation of high-performance flexible electronic devices.

[0005] At the same time, the current frontier research of flexible electronic technology is developing towards multifunctionalization and integration. Wearable electronic devices with single functions on the market have gradually been unable to meet the needs of people. Realizing thermal management, protection, and parallel monitoring of multiple human physiological signals in a single device can solve the bottleneck problem of single-function wearable electronic devices. Summary of the Invention

[0006] To solve the above technical problems, the present invention provides the following technical solutions: an integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric, its preparation method and application.

[0007] One of the objectives of the present invention is to provide a preparation method of an integrated super-elastic antibacterial and waterproof hierarchical multi-functional fabric, and the preparation method includes:

[0008] S1: Electrospinning a SEBS (styrene-ethylene-butene-styrene block copolymer) spinning solution to obtain a fibrous fabric substrate. After subjecting it to plasma treatment, it is immersed in an antibacterial nanoparticle dispersion liquid, ultrasonically treated and dried, and then a strain-sensitive circuit and a strain-insensitive circuit are respectively printed on both sides thereof with liquid metal to obtain a single-layer liquid metal fabric;

[0009] S2: Stacking a SEBS fibrous fabric as an isolation layer on one side of the strain-sensitive circuit of the single-layer liquid metal fabric through electrospinning, and then printing a Joule heating circuit with liquid metal on the surface of the isolation layer to obtain a double-layer liquid metal fabric;

[0010] S3: Stacking SEBS fibrous fabrics as encapsulation layers on both sides of the double-layer liquid metal fabric through electrospinning, and then spraying superhydrophobic nanoparticles on the surface of the encapsulation layer. After drying, an integrated super-elastic antibacterial and waterproof hierarchical multi-functional fabric is obtained.

[0011] As a preferred solution of the present invention, wherein, the SEBS spinning solution in S1 is composed of a SEBS solution and an ionic liquid, the solid content of the SEBS spinning solution is 8-25 wt.%, and the mass of the ionic liquid is 0.1-0.5% of the mass of SEBS.

[0012] As a further preferred solution of the present invention, wherein, the solvent of the SEBS solution is composed of chloroform and toluene in a mass ratio of 95:5 to 80:20.

[0013] As a further preferred solution of the present invention, wherein, SEBS is a linear triblock copolymer with a polystyrene content of 20-30 wt.%.

[0014] As a preferred solution of the present invention, wherein, the electrospinning parameters in S1 are: voltage 10-30 kV, receiving distance 8-25 cm, spinneret aperture 0.25-1 mm, receiving roller rotation speed 60-150 rpm, spinning speed 3-10 mL / h, and spinning time 30-180 min.

[0015] As a preferred solution of the present invention, wherein, the thickness of the fibrous fabric substrate in S1 is 100-300 μm.

[0016] As a preferred solution of the present invention, wherein, the power of the plasma treatment in S1 is 200-600 W, and the treatment time is 2-5 min.

[0017] As a preferred embodiment of the present invention, in the preparation process of the antibacterial nanoparticle dispersion in S1: Add Ag / Zn particles and tetrabutyl titanate to ultrapure water, and perform dispersion treatment under ultrasonic waves of 400 - 800W for 0.5 - 3h; wherein, the content of Ag / Zn particles is 1.0 - 2.5 wt.% of the ultrapure water, and the content of tetrabutyl titanate is 0.8 - 1.4 wt.% of the ultrapure water.

[0018] As a preferred embodiment of the present invention, in S1, the power of the ultrasonic treatment is 200 - 600W, and the time is 30 - 90min.

[0019] As a preferred embodiment of the present invention, in S1, the liquid metal is gallium indium alloy (EGaIn), and the printing thickness is 10 - 20μm.

[0020] As a preferred embodiment of the present invention, in S2, the electrospinning time is 30 - 90min, the thickness of the isolation layer is 100 - 200μm, and the other parameters are the same as those in S1.

[0021] As a preferred embodiment of the present invention, in S2, the printing thickness of the Joule heating circuit is 10 - 20μm.

[0022] As a preferred embodiment of the present invention, in S3, the electrospinning time is 30 - 90min, the thickness of the single - side encapsulation layer is 100 - 200μm, and the other parameters are the same as those in S1.

[0023] As a preferred embodiment of the present invention, in the preparation process of the super - hydrophobic nanoparticles in S3: Add Ag / Zn particles and perfluorooctyltriethoxysilane (PFOTES) to absolute ethanol, and perform dispersion treatment under ultrasonic waves of 400 - 800W for 0.5 - 3h; wherein, the content of Ag / Zn particles is 5.0 - 7.5 wt.% of the absolute ethanol, and the content of PFOTES is 0.5 - 1.5 wt.% of the absolute ethanol.

[0024] As a preferred embodiment of the present invention, in S3, the spraying dosage of the super - hydrophobic nanoparticles is 1.5 - 5.0g / cm 2 。

[0025] The second object of the present invention is to provide an integrated super - elastic antibacterial and waterproof hierarchical multi - functional fabric prepared by the above method.

[0026] The third object of the present invention is to provide an application of an integrated super - elastic antibacterial and waterproof hierarchical multi - functional fabric prepared by the above method as a skin - adhering electrode for real - time monitoring of human physiological electrical signals.

[0027] A fourth object of the present invention is to provide an application of an integrated super-elastic antibacterial and waterproof hierarchical multi-functional fabric prepared by the above method in the preparation of a flexible strain sensing device.

[0028] A fifth object of the present invention is to provide an application of an integrated super-elastic antibacterial and waterproof hierarchical multi-functional fabric prepared by the above method as a Joule heating device in personal thermal management.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention uses a highly elastic and low Young's modulus thermoplastic non-woven fabric prepared by electrospinning as a breathable and moisture-permeable substrate material and a circuit isolation layer, and prepares a hierarchical flexible electronic device through different surface functional modification means, liquid metal printing, and layer-by-layer electrospinning. The preparation process is simple and easy to operate, the raw materials used are inexpensive, and large-scale preparation can be carried out. The specific advantages are as follows:

[0031] 1) The hierarchical multi-functional fabric of the present invention loads antibacterial nanoparticles in the near-skin fabric layer to maintain a healthy microenvironment during long-term skin contact. Two kinds of liquid metal circuits are printed on it to detect human strain signals and physiological electrical signals respectively; a liquid metal heating circuit is printed in the middle layer to achieve the function of heat therapy; the outermost encapsulation layer is modified with superhydrophobic nanoparticles to protect the internal circuit from environmental moisture erosion. Finally, an integrated super-elastic antibacterial and waterproof hierarchical multi-functional fabric is prepared, which integrates the functions of heat therapy and monitoring of various human physiological signals, as well as excellent wearing comfort and weather resistance.

[0032] 2) The hierarchical functional fabric prepared by the present invention is formed by layer-by-layer stacking through electrospinning, and the base materials are all SEBS elastomers. Therefore, the interfacial bonding force between layers is very strong, and it can be repeatedly stretched under large strains without detachment. At the same time, the non-woven fabric substrate has good breathable and moisture-permeable properties, improving the wearing comfort.

[0033] 3) The hierarchical functional fabric prepared by the present invention uses SEBS as the base material and eutectic gallium-indium liquid metal to print the circuit, constructing a strong bonding force between the circuit and the fabric. The prepared hierarchical functional fabric has stable conductivity under various complex strains and stretching, and can be used as a highly stretchable skin electrode for monitoring human motion signals and physiological electrical signals, as well as Joule heating.

[0034] 4) The present invention spins a polymer into a micro-nano scale fiber non-woven fabric through electrospinning technology. By adjusting various electrospinning parameters (such as spinning solution composition, voltage, nozzle size, receiving distance, spinning time, etc.), the fiber diameter and fabric thickness can be easily adjusted. At the same time, adding ionic liquid to the spinning solution effectively improves the diameter uniformity of the SEBS fabric.

[0035] 5) The present invention forms active groups such as hydroxyl groups, carbonyl groups, and carboxyl groups and unsaturated bonds on the surface of SEBS fibers through plasma treatment. These active groups form hydrogen bond interactions with tetra-n-butyl titanate on the surface of Ag / Zn particles, thereby effectively improving the loading firmness of Ag / Zn particles on the surface of SEBS fibers.

[0036] 6) The present invention introduces Ag / Zn nanoparticles into the hierarchical functional fabric. Ag / Zn particles belong to silver ion antibacterial agents, which are safe and harmless to the human body. They can achieve a broad-spectrum antibacterial effect by interfering with and destroying proteins inside bacteria, and have good bacteriostatic and bactericidal effects on Escherichia coli, Staphylococcus aureus, Candida albicans, Klebsiella pneumoniae, Pseudomonas aeruginosa, and various fungi. Surface treatment of SEBS non-woven fabrics with Ag / Zn particles not only endows the wearable electronic devices with antibacterial properties, but also improves the surface roughness of the SEBS fiber membrane to improve the printing process of liquid metal.

[0037] 7) The hierarchical functional fabric prepared by the present invention seamlessly integrates different functional liquid metal circuits in an integrated non-woven fabric, not only realizing multi-functional parallel operation, but also ensuring the overall air permeability of the device.

[0038] 8) The present invention performs superhydrophobic modification on the outermost encapsulation layer of the hierarchical functional fabric. Through the synergistic effect of PFOTES and Ag / Zn nanoparticles, the SEBS fabric fibers are endowed with excellent water-repellent properties, which can prevent liquids from infiltrating into the inner layer circuit and damaging the device, greatly improving the weather resistance and service life of the wearable electronic device.

[0039] 9) The integrated super-elastic antibacterial and waterproof hierarchical multi-functional fabric prepared by the present invention has broad application prospects in the fields of flexible electrodes, flexible wearable electronic devices, and smart fabrics, etc. Description of the Drawings

[0040] Figure 1 It is a cross-sectional electron micrograph of the integrated super-elastic antibacterial and waterproof hierarchical multi-functional fabric obtained in Example 1. (A) Cross-sectional SEM image, (B) is a digital photo of each liquid metal circuit;

[0041] Figure 2 It is a physical diagram of the integrated super-elastic antibacterial and waterproof hierarchical multi-functional fabric obtained in Example 1 under 300% stretching;

[0042] Figure 3Comparison chart of antibacterial performance tests for the integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric obtained in Example 1 and the hierarchical multifunctional fabric obtained in Comparative Example 1. (A) Survival rate curve of Escherichia coli (E-Coli) before and after 24 hours of washing. (B) Scanning electron micrograph of Escherichia coli on the surface of the hierarchical multifunctional fabric obtained in Comparative Example 1. (C) Scanning electron micrograph of Escherichia coli on the surface of the hierarchical multifunctional fabric obtained in Example 1;

[0043] Figure 4 Waterproof performance test of the integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric obtained in Example 1: (A) Photographs of water repellency performance for different liquids. (B) Statistical chart of contact angles corresponding to (A);

[0044] Figure 5 Test chart for monitoring elbow flexion movement underwater of the integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric obtained in Example 1. (A) Photograph of the monitored object. (B) Resistance signal corresponding to finger flexion movement;

[0045] Figure 6 Monitoring chart of human physiological electrical signals by the integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric obtained in Example 1. (A) Electrocardiogram signals during push-up and jogging exercises. (B) Electromyogram signals of the forearm when applying different grip forces;

[0046] Figure 7 Performance test chart for the integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric as a Joule heating patch application. (A) Infrared photographs at different time points when attached to the back of the human hand. (B) Temperature response chart at different voltages. (C) Stability performance test chart at different input voltages. Detailed implementation manners

[0047] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following describes the detailed implementation manners of the present invention in conjunction with the embodiments of the specification.

[0048] Many specific details are set forth in the following description to facilitate a thorough understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0049] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation manner of the present invention. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they separate or alternative embodiments that exclude each other with other embodiments.

[0050] The Escherichia coli (E-Coli) used below is a commercially available product.

[0051] Example 1. The preparation method of the integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric in this example includes the following steps:

[0052] S1:

[0053] Preparation of SEBS spinning solution: Weigh 40 g of SEBS masterbatch and 0.4 g of ionic liquid respectively, add them into a mixed solvent composed of 204 g of chloroform and 22.7 g of toluene, stir at room temperature for 4 h until completely dissolved, and prepare a SEBS spinning solution with a concentration of 15 wt.%. The SEBS masterbatch is a linear triblock copolymer with a polystyrene content of 20 wt.%, and the ionic liquid is 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide;

[0054] Preparation of antibacterial nano-particle dispersion: Add 1.8 g of Ag / Zn particles ( Composite antibacterial agent, Shanghai Langyi Functional Materials Co., Ltd.) and 1.2 g of tetrabutyl titanate into 100 g of ultrapure water, disperse and treat under 800 W ultrasonic for 2 h to obtain an antibacterial nano-particle dispersion;

[0055] Preparation of single-layer liquid metal fabric: First, transfer the SEBS spinning solution into a syringe, install it on an electrospinning machine, and carry out electrospinning under the following spinning parameters: positive voltage is 20 kV, negative voltage is -2 kV, receiving distance is 15 cm, inner diameter of the spinneret is 0.6 mm, rotational speed of the receiving roller is 80 rpm, spinning speed is 0.4 mL / min, and spinning time is 100 min to obtain a fiber fabric substrate with a thickness of 200 μm;

[0056] Then, perform plasma treatment on the obtained fiber fabric substrate. The power of plasma treatment is 600 W, the treatment time is 2 min, and the oxygen flow rate is 1 Nl / min;

[0057] Subsequently, soak it in the antibacterial nano-particle dispersion, perform ultrasonic treatment at 600 W for 30 min, and dry it in an oven for 30 min;

[0058] Finally, print a strain-sensitive circuit and a strain-insensitive circuit (combined with Figure 1 ) on both the front and back sides thereof with gallium-indium alloy liquid metal, and the printing thickness is 20 μm to obtain a single-layer liquid metal fabric;

[0059] S2:

[0060] Isolation layer preparation: An SEBS fiber fabric is stacked on one side of the printed strain-sensitive circuit on the single-layer liquid metal fabric through electrospinning as the isolation layer. The electrospinning parameters are as follows: the positive voltage is 20 kV, the negative voltage is -2 kV, the receiving distance is 15 cm, the inner diameter of the spinneret is 0.6 mm, the rotation speed of the receiving roller is 80 rpm, the electrospinning speed is 0.4 mL / min, and the electrospinning time is 60 min, obtaining an isolation layer with a thickness of 150 μm;

[0061] Printed circuit: A Joule heating circuit is printed on the surface of the isolation layer with a gallium-indium alloy liquid metal (combined with Figure 1 ), and the printing thickness is 20 μm, obtaining a double-layer liquid metal fabric;

[0062] S3:

[0063] Encapsulation layer preparation: An SEBS fiber fabric is stacked on both sides of the double-layer liquid metal fabric through electrospinning as the encapsulation layer. The electrospinning parameters are as follows: the positive voltage is 20 kV, the negative voltage is -2 kV, the receiving distance is 15 cm, the inner diameter of the spinneret is 0.6 mm, the rotation speed of the receiving roller is 80 rpm, the electrospinning speed is 0.4 mL / min, and the electrospinning time is 60 min, obtaining an encapsulation layer with a thickness of 150 μm;

[0064] Preparation of superhydrophobic nanoparticles: 6 g of Ag / Zn particles ( Composite antibacterial agent, Shanghai Langyi Functional Materials Co., Ltd.) and 1 g of PFOTES are added to 100 g of absolute ethanol, and dispersed under ultrasonic treatment at 800 W for 2 h to obtain a superhydrophobic nanoparticle dispersion;

[0065] Hydrophobic layer preparation: The superhydrophobic nanoparticles are sprayed on the surface of the encapsulation layer, and the spraying dosage is 2.5 g / cm 2 , and after drying in an oven at 60 °C, an integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric is obtained.

[0066] Figure 1 is the cross-sectional electron micrograph of the integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric obtained in Example 1. (A) Cross-sectional SEM image, (B) is the digital photo of each liquid metal circuit; as Figure 1 can be seen, it has a clear layered structure, and the three-layer liquid metal circuits are evenly printed on each layer of SEBS fabric.

[0067] Figure 2 is the physical diagram of the integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric obtained in Example 1 under 300% stretching; as Figure 2 can be seen, the integrated hierarchical multifunctional fabric of the present invention has excellent elasticity.

[0068] Figure 3Test comparison chart of antibacterial properties of the integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric obtained in Example 1 and the hierarchical multifunctional fabric obtained in Comparative Example 1. (A) is the survival rate curve of Escherichia coli (E-Coli) before and after 24-hour washing. (B) is the scanning electron micrograph of Escherichia coli on the surface of the hierarchical multifunctional fabric obtained in Comparative Example 1. (C) is the scanning electron micrograph of Escherichia coli on the surface of the hierarchical multifunctional fabric obtained in Example 1. As can be seen from Figure 3 It can be seen that the fabric of the present invention has significant antibacterial properties compared with the pure SEBS fabric, and Escherichia coli cannot survive on the fiber surface. Moreover, after 24-hour water washing, the antibacterial properties of the fabric remain stable.

[0069] Figure 4 Waterproof performance test of the integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric obtained in Example 1: (A) is the water-repellent performance photos of different liquids (water, tea, orange juice, milk, coffee and ink). (B) is the corresponding contact angle statistical chart of (A). As can be seen from Figure 4 It can be seen that the hierarchical functional fabric of the present invention has excellent water-repellent ability and shows consistent super-hydrophobic performance for different liquids.

[0070] Application Example 1: The integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric obtained in Example 1 is used as a strain sensor to monitor the bending movement of finger joints underwater.

[0071] Figure 5 Test chart of the integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric obtained in Example 1 for monitoring the bending movement of finger joints underwater. (A) is the monitoring physical photo. (B) is the corresponding resistance signal when the finger joint bends. As can be seen from Figure 5 It can be seen that when the functional fabric is used as a skin-attached strain sensor, it can also monitor the bending of human joints in real time underwater.

[0072] Application Example 2: The integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric obtained in Example 1 is used as a skin-attached bioelectrode to monitor human physiological electrical signals.

[0073] Figure 6 Monitoring chart of the integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric obtained in Example 1 for human physiological electrical signals. (A) is the electrocardiogram signal during push-ups and jogging. (B) is the electromyogram signal of the forearm when different grip forces are applied. As can be seen from Figure 6 It can be seen that the hierarchical functional fabric prepared by the present invention can be used as a skin electrode to monitor human electrocardiogram signal (ECG) and electromyogram signal (EMG) of different movements in real time, and the measured bioelectrical signals are stable and reproducible.

[0074] Application Example 3: The integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric obtained in Example 1 is used as a Joule heating patch and attached to the back of the human hand.

[0075] Figure 7 Performance test diagrams of the integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric obtained in Example 1 when applied as a Joule heating patch. (A) Infrared photo when attached to the back of the human hand. (B) Temperature response diagram at different voltages. (C) Stability performance test diagram. As can be seen from Figure 7 it, the hierarchical functional fabric prepared by the present invention has Joule heating function, its temperature response performance is stable and repeatable, and it can be used for skin-attached heating electrode sheets.

[0076] Example 2:

[0077] The difference between this example and Example 1 is that: in S1, the spinning time is 30 min and the thickness of the fiber fabric substrate is 100 μm; in S2, the spinning time is 30 min and the thickness of the isolation layer is 100 μm; in S3, the spinning time is 30 min and the thickness of the encapsulation layer is 100 μm. Other steps and parameters are the same as those in Example 1.

[0078] Comparative Example 1:

[0079] The difference between this comparative example and Example 1 is that: in S1, the plasma treatment and soaking in the antibacterial nanoparticle dispersion are omitted. Other steps and parameters are the same as those in Example 1.

[0080] The hierarchical functional fabric obtained in Comparative Example 1 does not have antibacterial performance compared with the functional fabrics obtained in Examples 1-2; and the surface roughness of the fiber is not improved, resulting in a decrease in the printing and forming accuracy of the liquid metal.

[0081] Comparative Example 2:

[0082] The difference between this comparative example and Example 1 is that: in S1, the process parameters of the plasma treatment are: power is 200 W and treatment time is 1 min. Other steps and parameters are the same as those in Example 1.

[0083] The loading amount of Ag / Zn antibacterial particles on the hierarchical functional fabric obtained in Comparative Example 2 is significantly less than that in Examples 1-2, and the particle adhesion fastness is poor, and the antibacterial performance is significantly low.

[0084] Comparative Example 3:

[0085] The difference between this comparative example and Example 1 is that: in S3, the preparation of superhydrophobic nanoparticles: 6 g of Ag / Zn particles ( composite antibacterial agent, Shanghai Langyi Functional Materials Co., Ltd.) are added to 100 g of absolute ethanol, and dispersed and treated under ultrasonic wave at 800 W for 2 h to obtain a superhydrophobic nanoparticle dispersion. Other steps and parameters are the same as those in Example 1.

[0086] The water contact angle of the functional fabric obtained in Comparative Example 3 is 130°, which does not have a superhydrophobic effect compared with Examples 1-2 and cannot achieve the protection of the internal circuit.

[0087] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. Preparation method of an integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric, characterized in that, The hierarchical multifunctional fabric includes a fiber fabric substrate, a strain-sensitive circuit, a strain-insensitive circuit, an isolation layer, a Joule heating circuit, and a packaging layer; The preparation method includes the following steps: S1: Electrospinning the SEBS spinning solution to obtain a fiber fabric substrate. After plasma treatment, it is immersed in an antibacterial nanoparticle dispersion solution, ultrasonically treated and dried, and then a strain-sensitive circuit and a strain-insensitive circuit are printed on both sides thereof with liquid metal to obtain a single-layer liquid metal fabric; The power of the plasma treatment is 200 - 600 W, and the treatment time is 2 - 5 min; The preparation process of the antibacterial nanoparticle dispersion solution: Add Ag / Zn particles and tetrabutyl titanate to ultrapure water, and disperse and treat it under ultrasonic waves of 400 - 800 W for 0.5 - 3 h; among them, the content of Ag / Zn particles is 1.0 - 2.5 wt% of the ultrapure water, and the content of tetrabutyl titanate is 0.8 - 1.4 wt% of the ultrapure water; The power of the ultrasonic treatment is 200 - 600 W, and the time is 30 - 90 min; The liquid metal is a gallium-indium alloy, and the printing thickness is 10 - 20 μm; S2: Stack a SEBS fiber fabric on one side of the strain-sensitive circuit of the single-layer liquid metal fabric by electrospinning as an isolation layer, and then print a Joule heating circuit on the surface of the isolation layer with liquid metal to obtain a double-layer liquid metal fabric; S3: Stack SEBS fiber fabrics on both sides of the double-layer liquid metal fabric by electrospinning as a packaging layer, and then spray superhydrophobic nanoparticles on the surface of the packaging layer. After drying, an integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric is obtained; Preparation process of superhydrophobic nanoparticles: Add Ag / Zn particles and PFOTES into absolute ethanol, and disperse them under ultrasonic treatment at 400 - 800 W for 0.5 - 3 h; among them, the content of Ag / Zn particles is 5.0 - 7.5 wt% of absolute ethanol, the content of PFOTES is 0.5 - 1.5 wt% of absolute ethanol, and the spraying dosage of superhydrophobic nanoparticles in S3 is 1.5 - 5.0 g / cm 2 .

2. The preparation method of the integrated super-elastic antibacterial and waterproof hierarchical multi-functional fabric according to claim 1, characterized in that In S1, the SEBS spinning solution is composed of a SEBS solution and an ionic liquid. The solid content of the SEBS spinning solution is 8 - 25 wt%, and the mass of the ionic liquid is 0.1 - 0.5% of the mass of the SEBS; Among them, the solvent of the SEBS solution is composed of chloroform and toluene in a mass ratio of 95:5 - 80:20, and the SEBS is a linear triblock copolymer with a polystyrene content of 20 - 30 wt%.

3. The preparation method of the integrated super-elastic antibacterial and waterproof hierarchical multi-functional fabric according to claim 1, characterized in that, The electrospinning parameters in S1 are: voltage 10 - 30 kV, receiving distance 8 - 25 cm, spinneret hole diameter 0.25 - 1 mm, receiving roller rotation speed 60 - 150 rpm, spinning speed 3 - 10 mL / h, spinning time 30 - 180 min, and the thickness of the fiber fabric substrate is 100 - 300 μm.

4. The preparation method of the integrated super-elastic antibacterial and waterproof hierarchical multi-functional fabric according to claim 3, characterized in that, The electrospinning time in S2 is 30 - 90 min, the thickness of the isolation layer is 100 - 200 μm, and the remaining electrospinning parameters are: voltage 10 - 30 kV, receiving distance 8 - 25 cm, spinneret hole diameter 0.25 - 1 mm, receiving roller rotation speed 60 - 150 rpm, spinning speed 3 - 10 mL / h. The printing thickness of the Joule heating circuit in S2 is 10 - 20 μm.

5. The preparation method of the integrated super-elastic antibacterial and waterproof hierarchical multi-functional fabric according to claim 3, characterized in that, In S3, the electrospinning time is 30 to 90 min, the thickness of the single-sided encapsulation layer is 100 to 200 μm, and the remaining electrospinning parameters are: voltage 10 to 30 kV, receiving distance 8 to 25 cm, spinneret aperture 0.25 to 1 mm, receiving roller rotation speed 60 to 150 rpm, and spinning speed 3 to 10 mL / h.

6. The integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric prepared by the preparation method of the integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric according to any one of claims 1-5.

7. Application of the integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric according to claim 6 as a skin-attached electrode in the real-time monitoring of human physiological electrical signals.

8. Application of the integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric according to claim 6 in the preparation of a flexible strain sensing device.

9. Application of the integrated super-elastic antibacterial and waterproof hierarchical multifunctional fabric according to claim 6 as a Joule heating device in personal thermal management.

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