A preparation method and sensor of flexible force-sensitive nonwoven sensing fabric based on MXene

Abstract

The present invention provides a method for preparing a MXene-based flexible force-sensitive nonwoven sensing fabric, comprising: preparing a MXene solution, including dissolving MXene in deionized water to prepare the MXene solution; pre-treating animal hair to remove impurities on the surface of the animal hair; repeatedly coating the pre-treated animal hair with MXene and drying it to form MXene-coated animal hair fibers; further treating the MXene-coated animal hair fibers to obtain a flexible force-sensitive nonwoven sensing fabric to be encapsulated; self-encapsulating the flexible force-sensitive nonwoven sensing fabric using a felting method to obtain animal hair felt; and evenly laying pure animal hair fibers on the animal hair felt for post-processing to obtain a MXene-based flexible force-sensitive nonwoven sensing fabric. Also provided is a force-sensitive fabric sensor, including a MXene-based flexible force-sensitive nonwoven sensing fabric prepared using the MXene-based flexible force-sensitive nonwoven sensing fabric preparation method; and a typical application of the force-sensitive fabric sensor in physiological signal monitoring.

Description

Technical Field

[0001] The present invention relates to the field of flexible wearable sensing technology, and in particular to a method for preparing a flexible force-sensitive non-woven sensing fabric based on MXene and a sensor. Background Art

[0002] With the increasing demand for portable and intelligent electronic devices, flexible wearable sensors are showing great potential for development in healthcare, sports monitoring, human-computer interaction, artificial intelligence, and other fields. Thin films, hydrogels, and fabrics are currently the most common forms of flexible sensors, each with different technical characteristics. For example, thin film sensors have high sensitivity and short response times, but due to the film's airtightness, prolonged wear may cause skin discomfort. Hydrogel sensors adhere closely to the skin and have strong stretch resistance and repair capabilities, but they are prone to water loss, which can lead to a decrease in sensing performance. Fabric sensors are currently attracting widespread attention due to their inherent wearable comfort and good electrical properties. Among them, integrating conductive sensitive materials with a non-conductive fabric substrate is currently the simplest and most effective method for preparing fabric sensors.

[0003] In recent years, two-dimensional materials have attracted extensive attention in the field of flexible wearable sensors due to their ultra-thin thickness, ultra-high carrier mobility, and excellent electrical or optical properties. x -MXene, as a new type of two-dimensional material, is a metal carbide or nitride with a layered structure. It can be selectively etched into two-dimensional nanosheets by hydrofluoric acid on Ti3AlC2. Two-dimensional nanosheets have good metallic conductivity, large specific surface area, high elastic modulus and hydrophilicity, and have attracted widespread attention as a sensitive material.

[0004] Fabric sensors use fibers / yarns / fabrics as a flexible substrate. Sensing materials are incorporated into the substrate using various fabrication methods. The sensors utilize their sensitive properties to convert the measured physical quantity into an electrical signal for measurement. Compared to thin-film sensors, fabric sensors suffer from lower sensitivity and longer response times. Furthermore, most fabric sensors utilize thin-film packaging, which still presents issues such as airtightness and skin sensitivity. As the fundamental building block of fabric sensors, fiber largely determines sensor performance. Natural animal hair fibers, a common raw material in the textile industry, possess a unique structural structure, generally consisting of three parts: the medulla, the cortex, and the scales. The scales coat the outer portion of the hair shaft. The scales are attached to the hair shaft at their base and extend outward toward the tip, forming a sloping, stepped structure. The presence of the scales increases the surface area of ​​animal hair fibers compared to chemical fibers. Therefore, the surface of animal hair fibers can accommodate a greater amount of nanomaterials as coatings. There is a clear difference between fabrics made by felting animal hair and ordinary non-woven fabrics: ordinary non-woven fabrics are made from chemical fibers through physical means, lack the scaly structure on the surface of animal hair fibers, and the sensitivity of the sensor is relatively poor. However, there is currently no mature technical method to implement the above technical concept. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a method for preparing a flexible force-sensitive non-woven sensing fabric based on MXene and a sensor. The force-sensitive non-woven fabric sensor is prepared using animal hair coated with MXene. The sensor has the advantages of high sensitivity and short response time, and can be used for real-time monitoring of weak pulse signals, respiratory signals and body posture. The principle is that the conductive fiber prepared by the coating method is used as the raw material for the weaving method to obtain a fabric sensor with better electrical properties and a denser structure; and the sensor can be self-packaged by the felting method, which solves the problem that fabric sensing still requires thin film packaging. It has broad development prospects in the field of health monitoring.

[0006] The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions.

[0007] According to one aspect of the present invention, a method for preparing a flexible force-sensitive nonwoven sensing fabric based on MXene is provided, comprising:

[0008] S1, preparing a MXene solution, comprising: dissolving MXene in deionized water to prepare the MXene solution;

[0009] S2, pre-treating the animal hair to remove impurities on the surface of the animal hair;

[0010] S3, repeatedly coating the pretreated animal hair with MXene and drying it to form animal hair fibers coated with MXene;

[0011] S4, further processing the MXene-coated animal hair fiber to obtain a flexible force-sensitive non-woven sensing fabric to be encapsulated;

[0012] S5: self-encapsulating the flexible force-sensitive non-woven sensing fabric based on a felting method to obtain animal felt;

[0013] S6: Pure animal hair fibers are evenly laid on the animal felt for post-processing to obtain a MXene-based flexible force-sensitive non-woven sensing fabric.

[0014] Preferably, the chemical formula of MXene in S1 is M n+1 X n T z , wherein M is a transition metal, X is carbon or nitrogen (n=1, 2, 3), T z They are surface hydrophilic groups such as -O, -H, -OH and F.

[0015] Preferably, the concentration of the MXene solution in S1 is in the range of 3 to 8 mg / mL.

[0016] Preferably, S2 comprises applying an organic solvent to the surface of the animal hair to remove impurities on the surface of the animal hair, and the organic solvent comprises acetone and anhydrous ethanol.

[0017] Preferably, the S3 includes:

[0018] S31, completely immersing the pretreated animal hair in the MXene solution under a constant temperature condition, so that the fiber surface of the pretreated animal hair is completely coated with MXene; wherein the constant temperature condition is 50 to 90° C.;

[0019] S32, drying the MXene-coated animal hair to obtain the MXene-coated animal hair fiber; the drying temperature is 60-80° C.;

[0020] S33, cyclically executing the "immersion-drying" cycle consisting of S31 and S32; the number of the "immersion-drying" cycles is 2 to 5 times.

[0021] Preferably, the S4 includes:

[0022] S41, drying the MXene-coated animal hair fiber, and spraying a small amount of the MXene solution on the surface to obtain the MXene-coated animal hair fiber after the first treatment; the concentration of the MXene solution in S41 is in the range of 3 to 8 mg / mL;

[0023] S42, placing the MXene-coated animal hair fiber after the first treatment between a foam film and a non-woven fabric for compaction treatment to obtain a flexible force-sensitive non-woven sensing fabric to be encapsulated.

[0024] Preferably, the S5 includes:

[0025] S51, applying pressure back and forth to the foam film using a felting tool to uniformly felt the animal hair fibers coated with MXene;

[0026] S52, naturally air-drying the uniformly felted MXene-coated animal hair fibers to obtain animal felt.

[0027] Preferably, the S6 includes:

[0028] S61, evenly spreading pure animal hair fibers on the animal felt, and spraying a small amount of deionized water on the surface to form a flexible force-sensitive non-woven sensing fabric base material;

[0029] S62, placing the base raw material between the foam film and the non-woven fabric to compact them, including: using a felting tool to apply pressure back and forth to the foam film and then naturally air-drying it, thereby obtaining a flexible force-sensitive non-woven sensing fabric based on MXene.

[0030] A second aspect of the present invention provides a force-sensitive fabric sensor, which includes a MXene-based flexible force-sensitive non-woven sensing fabric prepared by any of the aforementioned preparation methods.

[0031] A third aspect of the present invention provides an application of the force-sensitive fabric sensor described in the second aspect in physiological signal monitoring.

[0032] The present invention has significant advantages and beneficial effects compared to existing technologies. By utilizing the above technical solutions, the method, flexible force-sensitive nonwoven sensor fabric, and its applications provided by the present invention can achieve significant technological advancement and practicality, and have wide industrial application value. It has at least the following advantages:

[0033] The MXene-based nonwoven sensing fabric uses animal hair fibers with scaly surfaces as a carrier, allowing the MXene to coat its surface more thoroughly and evenly. The invention utilizes a wet felting method to create the felt from the MXene-coated fibers, allowing for more complete contact between the animal hair fibers, further enhancing sensor sensitivity and minimizing pressure response time. The use of flexible conductive silver wires as electrodes further enhances the wearability of the fabric sensor.

[0034] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, which can be implemented in accordance with the contents of the specification, and to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites preferred embodiments and describes them in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Hereinafter, some specific embodiments of the present invention will be described in detail in an illustrative and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. The objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0036] Attachment Figure 1 1 is a general flow chart of a method for preparing a MXene-based non-woven sensing fabric according to an embodiment of the present invention.

[0037] Attachment Figure 2 4 is a flow chart of a method for preparing a piezoresistive sensing fabric according to an embodiment of the present invention.

[0038] Attachment Figure 3 This is a physical picture of a MXene-based non-woven sensing fabric according to an embodiment of the present invention.

[0039] Attachment Figure 4 4 is a flow chart of a method for real-time monitoring of pulse and abdominal respiratory signals of the carotid artery, ankle artery, brachial artery, radial artery, and femoral artery according to an embodiment of the present invention.

[0040] Attachment Figure 5 These are pulse and respiratory signals obtained by monitoring physiological signals of various parts according to an embodiment of the present invention.

[0041] Attachment Figure 6 is the carotid-femoral artery pulse wave velocity measured according to an embodiment of the present invention.

[0042] Attachment Figure 7 is the brachial-ankle artery pulse wave velocity measured according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the following, in combination with the accompanying drawings and preferred embodiments, describes in detail the method for preparing a flexible force-sensitive non-woven sensing fabric based on MXene proposed by the present invention, its specific implementation method, method, steps and effects.

[0044] Through the description of the specific implementation methods, a deeper and more specific understanding of the technical means and effects adopted by the present invention to achieve the intended purpose can be obtained. However, the accompanying drawings are only provided for reference and illustration purposes and are not intended to limit the present invention.

[0045] There are various methods for combining substrates with sensitive materials, the most common of which are coating and weaving. The coating method is easy to use because of its simple operation, easy control of reaction conditions, and the resulting fabric sensor devices have high sensitivity, good linearity, and a wide measurement range. The weaving method is to weave conductive yarns to obtain conductive fabrics with sensing properties. The weaving method includes a variety of methods. In addition to the common weaving and hand weaving methods, for animal hair fibers, the felting method is also a very important method for bonding fibers into shaped fabrics. The sensors made by the felting method are non-woven fabric tissues. Non-woven tissues are denser than knitted tissues, and the resulting sensors are highly sensitive.

[0046] According to the present invention, a method for preparing a flexible force-sensitive nonwoven sensing fabric based on MXene is provided, comprising:

[0047] S1, preparing a MXene solution, comprising: dissolving MXene in deionized water to prepare the MXene solution;

[0048] S2, pre-treating the animal hair to remove impurities on the surface of the animal hair;

[0049] S3, repeatedly coating the pretreated animal hair with MXene and drying it to form animal hair fibers coated with MXene;

[0050] S4, further processing the MXene-coated animal hair fiber to obtain a flexible force-sensitive non-woven sensing fabric to be encapsulated;

[0051] S5: self-encapsulating the flexible force-sensitive non-woven sensing fabric based on a felting method to obtain animal felt;

[0052] S6: Pure animal hair fibers are evenly laid on the animal felt for post-processing to obtain a MXene-based flexible force-sensitive non-woven sensing fabric.

[0053] Preferably, the chemical formula of MXene in S1 is M n+1 X n T z , wherein M is a transition metal, X is carbon or nitrogen (n=1, 2, 3), T zIt is a surface hydrophilic group such as -O, -H, -OH and F; in the preferred embodiment, Ti3C2-MXene is used, and the Ti3C2-MXene used is obtained by etching MAX phase Ti3AlC2 powder with hydrofluoric acid for 12 to 36 hours, and then centrifuging, washing and ultrasonically dispersing it.

[0054] Preferably, the concentration of the MXene solution in S1 is in the range of 3 to 8 mg / mL.

[0055] Preferably, S2 comprises applying an organic solvent to the surface of the animal hair to remove impurities on the surface of the animal hair, and the organic solvent comprises acetone and anhydrous ethanol.

[0056] Preferably, the S3 includes:

[0057] S31, completely immersing the pretreated animal hair in the MXene solution under a constant temperature condition, so that the fiber surface of the pretreated animal hair is completely coated with MXene; wherein the constant temperature condition is 50 to 90° C.;

[0058] S32, drying the MXene-coated animal hair to obtain the MXene-coated animal hair fiber; the drying temperature is 60-80° C.;

[0059] S33, cyclically executing the "immersion-drying" cycle consisting of S31 and S32; the number of the "immersion-drying" cycles is 2 to 5 times.

[0060] Preferably, the S4 includes:

[0061] S41, after drying the MXene-coated animal hair fiber, spraying a small amount of the MXene solution on the surface to obtain the MXene-coated animal hair fiber after the first treatment; the concentration of the MXene solution in S41 is consistent with the concentration of the MXene solution in S1, and the concentration range is 3 to 8 mg / mL;

[0062] S42, placing the MXene-coated animal hair fiber after the first treatment between a foam film and a non-woven fabric for compaction treatment to obtain a flexible force-sensitive non-woven sensing fabric to be encapsulated.

[0063] Preferably, the S5 includes:

[0064] S51, using a felting tool (a cylindrical tool in this embodiment) to apply pressure back and forth to the foam film to uniformly felt the animal hair fibers coated with MXene;

[0065] S52, naturally air-drying the uniformly felted MXene-coated animal hair fibers to obtain animal felt.

[0066] Preferably, the S6 includes:

[0067] S61, evenly spreading pure animal hair fibers on the animal felt, and spraying a small amount of deionized water on the surface to form a flexible force-sensitive non-woven sensing fabric base material;

[0068] S62, placing the base raw material between the foam film and the non-woven fabric to compact them, including: using a felting tool to apply pressure back and forth to the foam film and then naturally air-drying it, thereby obtaining a flexible force-sensitive non-woven sensing fabric based on MXene.

[0069] The present invention proposes a flexible force-sensitive non-woven sensing fabric based on MXene, which not only meets the user's needs for high sensitivity and low response time, but also meets the needs for fabric packaging comfort, and can monitor indicators of human cardiovascular health.

[0070] The embodiment of the present invention provides a method for preparing a flexible force-sensitive nonwoven sensor fabric. Figure 1 ,include:

[0071] S1: Dissolve MXene in deionized water to obtain a 3-8 mg / mL MXene solution;

[0072] S2: Use acetone and anhydrous ethanol to remove impurities on the surface of animal hair;

[0073] S3: Immerse the animal hair in a MXene solution at a constant temperature of 50-90°C until the surface of the animal hair fiber is completely coated with MXene. Dry the MXene-coated animal hair at a temperature of 60-90°C. Repeat this process 2-5 times.

[0074] S4: Dry the MXene-coated animal hair fiber, spray a small amount of MXene aqueous solution on it, and place it between the foam film and non-woven fabric to compact it;

[0075] S5: Use a cylindrical tool to apply pressure back and forth on the foam film to make the animal hair evenly felted, and then let it air dry;

[0076] S6: Spread pure animal hair fibers evenly on animal felt, spray a small amount of deionized water on its surface, place it between the foam film and the non-woven fabric to compact it, and repeat S5 to obtain a flexible force-sensitive non-woven sensing fabric based on MXene.

[0077] Figure 2The schematic diagram of the preparation method of the piezoresistive sensing fabric according to the embodiment of the present disclosure is schematically shown, which includes: MXene solution 1 and animal hair 2. First, the impurities on the surface of the animal hair are washed off and dried to ensure that MXene can better cover the surface of the hair. Under constant temperature conditions, the washed hair is placed in a beaker containing the prepared MXene solution and sealed to ensure that the surface of the hair can be completely covered by MXene, and then the hair is dried. Then, the dried hair is evenly spread on a non-woven work pad, and a small amount of MXene aqueous solution is sprayed on the surface to form tiny water droplets on the surface of the hair. Afterwards, the hair is sandwiched between a foam film and a non-woven fabric to compact it, and then a cylindrical tool is used to apply pressure back and forth on the foam film to promote uniform felting of the hair. Finally, the hair felt made of hair fibers is placed flat in a ventilated place to air dry. This process of making hair into felt is called wet felting, which is a type of felting method.

[0078] The advantage of using animal hair fibers is that, as a natural fiber material, they are soft, elastic, and offer excellent warmth retention, making them an excellent textile raw material. Their main component is protein, a chain-like structure formed by a series of amino acids bound together by peptide bonds. Hair is surrounded by a layer of squamous cells, with cortical cells in the center. Within these cells, large fibers are arranged along an axis, giving each hair an orderly structure. Compared to ordinary chemical fibers, hair has a larger surface area, allowing for more contact with the MXene solution. When the fabric is subjected to external force, the distance between the fibers gradually decreases, allowing more MXene to come into contact, resulting in higher sensitivity and shorter response times.

[0079] Based on the above embodiment, the concentration of the MXene solution in S1 is in the range of 3 to 8 mg / mL. Using a MXene solution in this concentration range can better bond the MXene to the animal hair fiber.

[0080] Based on the above embodiment, the temperature range of immersing the animal hair fiber in the MXene solution in S3 is: 60-80°C.

[0081] The immersion temperature should not be too high, otherwise it will accelerate the oxidation of MXene. The immersion temperature should not be too low, otherwise the scales on the surface of the animal hair fiber will not open and the MXene will not be able to penetrate under the scale layer.

[0082] Another embodiment of the present invention provides a force-sensitive fabric sensor, which includes a flexible force-sensitive non-woven sensing fabric obtained by the aforementioned method for preparing the force-sensitive sensing fabric.

[0083] The MXene-based flexible force-sensitive non-woven sensing fabric obtained by the above-mentioned preparation method uses wool fibers with a large surface area as the substrate and MXene with strong electrical conductivity as the active material. It not only achieves the goals of high sensitivity and short response time, but can also be sewn onto clothing to monitor pulse signals with medical feature points in different parts of the body. By analyzing the pulse signals, a preliminary assessment of the human body's health status can be made.

[0084] The present invention is described in detail below with reference to specific embodiments.

[0085] Example 1:

[0086] Figure 2 This method describes a method for preparing a MXene-based nonwoven sensing fabric. The fabric sensor comprises a MXene solution 1 and animal hair 2. In this example, the animal hair used is wool fiber. First, the prepared wool is placed in a beaker of acetone and sonicated for 30 seconds to remove surface impurities. Next, the sonicated wool is placed in deionized water and sonicated for 30 seconds. After sonication, the wool is repeatedly rinsed with deionized water. Finally, the cleaned wool is dried in an oven at 60-80°C to obtain wool fibers free of surface impurities.

[0087] The resulting single-layer MXene flakes were ultrasonically dissolved in deionized water to prepare a 5 mg / mL MXene solution. Washed wool was then placed in a sealed beaker containing the MXene solution and kept at 70°C for 30 minutes to ensure the wool surface was completely covered with MXene. Finally, the wool was dried in a 70°C oven. This process was repeated three times. The dried wool was then evenly spread on a non-woven work mat. A small amount of a 5 mg / mL MXene aqueous solution was sprayed onto the surface, forming tiny water droplets. The wool was then sandwiched between a foam film and a non-woven fabric to compact it. A cylindrical tool was then used to apply pressure back and forth on the foam film to promote uniform felting. Finally, the wool felt, formed from the wool fibers, was placed flat in a well-ventilated area to air dry. This process of producing wool felt is called the wet felting method.

[0088] Since the resulting fabric will subsequently come into direct contact with the object being measured, MXene will be lost during this process, necessitating fabric encapsulation. To preserve the original texture of the wool fabric, pure wool uncoated with MXene is used for encapsulation. The prepared sensor is placed on a non-woven work mat, and then a layer of pure wool is evenly placed on the sensor. The subsequent method is the same as the wet felting method described above, except that deionized water is sprayed on the pure wool during encapsulation to promote the felting of the encapsulation layer. The encapsulated fabric sensor is air-dried to obtain the final MXene-based non-woven sensing fabric.

[0089] The actual picture of the MXene-based non-woven sensing fabric in this example is as follows Figure 3 The sensor has the advantages of good flexibility and does not require any textile technology, and can also be designed into different shapes and sizes according to different needs.

[0090] Example 2:

[0091] like Figure 4 As shown, the present invention provides a method for monitoring pulse and abdominal respiratory signals from the carotid, ankle, brachial, radial, and femoral arteries, and extracting signal parameters. Soft silver fiber threads are sewn to both sides of a fabric sensor to serve as electrodes for signal extraction. The sensors are then sewn to an elastic band and socks using ordinary sewing thread to detect pulse signals at different locations. Figure 5 The pulse signals at different locations are shown in Figure 2. By comparing and calculating the simultaneously measured femoral artery and carotid artery pulse wave velocity (cfPWV), the carotid-femoral artery pulse wave velocity (cfPWV) can be obtained. Figure 6 As shown in Figure 2, by comparing and calculating the brachial artery and ankle artery measured simultaneously, the brachial-ankle pulse wave velocity (baPWV) can be obtained, as shown in Figure 2. Figure 7 As shown. Pulse wave velocity reflects changes in vascular elasticity, and because functional changes in arterial stiffness occur earlier than structural changes, pulse wave velocity can detect arterial elasticity earlier. Both parameters are important for diagnosing cardiovascular disease. cfPWV is considered the gold standard for non-invasive aortic stiffness measurement, and baPWV is a PWV measurement method that is more popular in Asia. The latter mainly reflects peripheral arterial elasticity, while the former mainly reflects large arterial elasticity. The corresponding calculation method is PWV = △L / △T, where △L represents the distance between the two measurement points; in cfPWV, △L refers to the distance between the neck and thigh; in baPWV, △L refers to the distance between the upper arm and ankle; and △T represents the delay time for the pulse wave to move from the proximal measurement point to the distal measurement point. The higher the PWV value, the greater the risk of developing brain and cardiovascular diseases.

[0092] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed in terms of preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the present profession can make slight changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a flexible force-sensitive nonwoven sensing fabric based on MXene, characterized in that: include: S1, preparing a MXene solution, comprising: dissolving MXene in deionized water to prepare the MXene solution; S2, pre-treating the animal hair to remove impurities on the surface of the animal hair; S3, repeatedly coating the pretreated animal hair with MXene multiple times, and drying to form MXene-coated animal hair fibers; the animal hair fibers are animal hair fibers having a scaly surface; S4, further processing the MXene-coated animal hair fiber to obtain a flexible force-sensitive non-woven sensing fabric to be encapsulated; S5, self-encapsulating the flexible force-sensitive non-woven sensing fabric based on a felting method to obtain animal felt; S6, evenly laying pure animal hair fibers on the animal felt for post-processing to obtain a MXene-based flexible force-sensitive nonwoven sensing fabric; The S3 includes: S31, completely immersing the pretreated animal hair in the MXene solution under a constant temperature condition, so that the fiber surface of the pretreated animal hair is completely coated with MXene; wherein the constant temperature condition is 50 to 90° C.; S32, drying the MXene-coated animal hair to obtain the MXene-coated animal hair fiber, wherein the drying temperature is 60-80° C.; S33, cyclically executing the "immersion-drying" cycle consisting of S31 and S32, wherein the number of "immersion-drying" cycles is 2 to 5 times; The S4 includes: S41, drying the MXene-coated animal hair fiber, and spraying a small amount of the MXene solution on the surface to obtain the MXene-coated animal hair fiber after the first treatment; the concentration of the MXene solution in S41 is in the range of 3 to 8 mg / mL; S42, placing the MXene-coated animal hair fiber after the first treatment between a foam film and a non-woven fabric for compaction treatment to obtain a flexible force-sensitive non-woven sensing fabric to be encapsulated; The S5 includes: S51, applying pressure back and forth to the foam film using a felting tool to uniformly felt the animal hair fibers coated with MXene; S52, naturally air-drying the uniformly felted MXene-coated animal hair fibers to obtain animal felt; The S6 includes: S61, evenly spreading pure animal hair fibers on the animal felt, and spraying a small amount of deionized water on the surface to form a flexible force-sensitive non-woven sensing fabric base material; S62, placing the base raw material between the foam film and the non-woven fabric to compact them, including: using a felting tool to apply pressure back and forth to the foam film and then naturally air-drying it, thereby obtaining a flexible force-sensitive non-woven sensing fabric based on MXene.

2. The method for preparing a flexible force-sensitive nonwoven sensing fabric based on MXene according to claim 1, characterized in that: include: The chemical formula of MXene in S1 is M n+1 X n T z , where M is a transition metal, X is carbon or nitrogen, n = 1, 2, 3, T z They are surface hydrophilic groups such as -O, -H, -OH and F.

3. The method for preparing a flexible force-sensitive nonwoven sensing fabric based on MXene according to claim 2, characterized in that: The concentration of MXene solution in S1 ranges from 3 to 8 mg / mL.

4. The method for preparing a flexible force-sensitive nonwoven sensing fabric based on MXene according to claim 3, characterized in that: The step S2 includes applying an organic solvent to the surface of the animal hair to remove impurities on the surface of the animal hair, wherein the organic solvent includes acetone and anhydrous ethanol.

5. A force-sensitive fabric sensor, comprising a MXene-based flexible force-sensitive non-woven sensing fabric prepared by the method for preparing a MXene-based flexible force-sensitive non-woven sensing fabric as described in any one of claims 1 to 4.

6. Use of the force-sensitive fabric sensor according to claim 5 in physiological signal monitoring.

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