Highly elastic sensing woven fabric and preparation method thereof, fabric sensor

Abstract

The application discloses a kind of high elasticity sensing woven fabric and preparation method thereof, fabric sensor, belong to flexible sensor technical field, preparation method includes: using cellulose-based yarn preparation Z twist single yarn and S twist single yarn, two Z twist single yarns are parallel to Z twist strand; two S twist single yarns are parallel to S twist strand; Z twist strand and S twist strand are alternately arranged to form warp, use another twist degree fiber yarn as weft, mixed weaving forms woven fabric;Woven fabric is treated by mixing solution of ratio of lye, conductive nanoparticles and deionized water, impregnation, rinsing, drying.The application uses cellulose-based Z / S twist strand with specific high twist structure as warp, and uses the alkali swelling effect of lye, triggers the torque potential stored in strand to release, makes it directional shrinkage buckling out of fabric plane, forms regular spring-like structure;Make woven fabric have spring-like tensile-rebound characteristics in warp direction, so that high elasticity far exceeding traditional woven fabric is obtained.

Description

Technical Field

[0001] This invention belongs to the field of flexible sensor technology, specifically relating to a highly elastic sensing woven fabric and its preparation method, and a fabric sensor. Background Technology

[0002] Flexible sensors are a new type of electronic device that can be bent, stretched, and conform to complex surfaces like skin. Their core lies in converting external stimuli such as deformation and pressure into electrical signals through special materials and structures. Flexible sensors achieve a combination of flexibility and sensing capabilities through their unique materials and construction.

[0003] The sensing film of flexible sensors is mainly formed by coating a conductive material onto the surface of a flexible substrate. Existing conventional flexible substrates are typically films made of polyimide, polyester, or polydimethylsiloxane, which possess good flexibility and chemical stability. The conductive material is usually composed of carbon-based materials (graphene, carbon nanotubes, or carbon black), metallic materials (silver nanowires, liquid metal), or conductive polymer composites. The conductive material is coated and cured onto the surface of the flexible substrate through processes such as coating and imprinting to form a conductive film.

[0004] However, the instability of the interface between existing flexible substrates and conductive coating materials can easily cause signal drift or failure, affecting the reliability and durability of the sensor. To address the bonding problem between flexible substrates and conductive coating materials, existing technologies involve blending conductive materials with polymers through spinning. While this method improves the durability of the resulting flexible conductive material, the mismatch in mechanical properties between the conductive material and the flexible textile substrate during weaving can lead to stress concentration under dynamic deformation, affecting the sensing accuracy and wearability comfort of the flexible sensor. Summary of the Invention

[0005] In view of one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a method for preparing a highly elastic sensing woven fabric, which is used to prepare a highly elastic sensing woven fabric to solve the problem of easy separation between the flexible substrate and the conductive coating material in existing flexible sensors.

[0006] To achieve the above objectives, the present invention provides a method for preparing a highly elastic sensing woven fabric, comprising the following steps: S1. Use cellulose-based yarn to spin Z-twist single yarn and S-twist single yarn with the first twist respectively. Combine the two Z-twist single yarns to form a Z-twist ply; combine the two S-twist single yarns to form an S-twist ply. S2. Alternately arrange Z-twist and S-twist yarns to form warp yarns; use fiber yarn with the second twist as weft yarn, and mix the warp and weft yarns to form woven fabric; S3. Mix the alkaline solution, conductive nanoparticles and deionized water according to the set mass ratio to obtain a mixed solution; S4. Immerse the woven fabric in the mixed solution, and then rinse and dry the woven fabric after immersion. S5. Repeat step S4 several times to obtain a highly elastic sensing fabric.

[0007] As a further improvement of the present invention, the first twist is 450~550; the twist of the Z-twist yarn and the S-twist yarn is 1.3~1.5 times the first twist; and the second twist is 300~350.

[0008] As a further improvement of the present invention, the Z-twist single yarn and the S-twist single yarn are formed from one of cotton fiber, linen fiber or viscose fiber; the second twist fiber yarn is formed from one of polyester fiber, nylon fiber or aramid fiber.

[0009] As a further improvement of the present invention, the ratio of the spacing between two adjacent fiber yarns in the weft yarn to the diameter of the fiber yarn is 2 to 4.

[0010] As a further improvement of the present invention, the alkaline solution in S3 is a sodium hydroxide solution, and the mass ratio of the alkaline solution, conductive nanoparticles and deionized water is 1:3:10 to 3:8:10.

[0011] As a further improvement of the present invention, the conductive nanoparticles are a mixture of carbon nanotubes and copper powder, wherein the mass ratio of carbon nanotubes to copper powder is 1:1 to 1:2, and the particle size of copper powder ranges from 100 nm to 1 μm.

[0012] As a further improvement of the present invention, the immersion time of the woven fabric in S4 is 30~60min, and the immersion temperature is 30~90℃.

[0013] As a further improvement of the present invention, the drying temperature in S4 is 50~80℃.

[0014] The present invention also includes a highly elastic sensing fabric, which is prepared by the same method used for preparing the highly elastic sensing fabric.

[0015] The present invention also includes a fabric sensor comprising the aforementioned highly elastic sensing fabric.

[0016] The aforementioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0017] In summary, the beneficial effects of the above-described technical solutions conceived by this invention compared with the prior art include: (1) The method for preparing the high elasticity sensing woven fabric of the present invention is to form Z-twist ply and S-twist ply respectively by two Z-twist single yarns and two S-twist single yarns. After the two single yarns with the same twisting direction are twisted together, they form ply with internal torsional potential energy. When treated with alkaline solution, the Z-twist ply and S-twist ply release torque potential energy outward under the swelling effect of alkaline solution. The Z-twist ply and S-twist ply abut against each other, which restricts the release of the torsional force in the ply. This makes the Z-twist ply and S-twist ply form a structure that abuts against each other. By restricting the warp yarn with the weft yarn, a complete planar structure with internal potential energy is formed. Meanwhile, due to the mutual contact between the Z-twist and S-twist yarns, the conductive nanoparticles attached to the surface of the woven fabric form a stable conductive path through mutual contact. When the woven fabric is subjected to tensile force, the adjacent Z-twist and S-twist yarns are straightened, the contact points between the Z-twist and S-twist yarns decrease or even separate, and part of the path formed by the conductive nanoparticles is broken, resulting in a significant increase in contact resistance. After the strain is released, the Z-twist and S-twist yarns will retract, allowing the conductive nanoparticles to return to the stable conductive path state. Through this mechanism of reversible contact resistance change, the highly elastic sensing woven fabric achieves a sensitive and repeatable response to strain.

[0018] (2) The method for preparing the high-elasticity sensing woven fabric of the present invention involves strictly controlling the twist of the Z-twist single yarn and the S-twist single yarn, as well as the twist of the Z-twist ply and the S-twist ply, to ensure that the S-twist ply and the Z-twist ply swell to a state of tight contact after soaking in alkaline solution, and that the ply gradually separates after being stretched. On the other hand, the fiber yarn with the second twist, which serves as the weft yarn, is mainly used to assist the warp yarn, and the two work together to form the woven fabric structure. By appropriately reducing the second twist, the warp yarn is not disturbed by the weft yarn when the subsequent torsional potential energy is released, thus ensuring the stable change of the resistance of the high-elasticity sensing woven fabric.

[0019] (3) The preparation method of the high elasticity sensing woven fabric of the present invention uses cotton fiber, hemp fiber or viscose fiber for the warp yarn. The above fibers have the characteristics of alkali swelling, etching, hydroxyl content and skin-friendly. After being treated with alkali solution, conductive nanoparticles are formed on the surface and a spring structure is formed. The weft yarn mainly serves as the limiting structure of the warp yarn. It uses polyester fiber, nylon fiber or aramid fiber, which makes it have good alkali resistance, high strength, dimensional stability and inert surface. It can serve as the fabric skeleton, maintain a sparse structure, not be affected by alkali solution, ensure the stable deformation of the woven fabric along the warp direction, and ensure the stable change of resistance of the high elasticity sensing woven fabric under tension.

[0020] (4) The method for preparing the high-elasticity sensing woven fabric of the present invention involves micro-etching the surface of cellulose with sodium hydroxide solution to form a microcrack structure on the yarn surface, which facilitates the physical embedding and anchoring of carbon nanotubes and makes it easier to form conductive bridging parts at the warp yarn junctions. Copper powder generates copper ions and their complexes under the action of alkaline solution, which can undergo coordination reactions with the hydroxyl groups on the cellulose macromolecular chain, thereby forming a stable bond between cellulose and conductive materials. Through the dual combination of physical anchoring (carbon nanotubes) and chemical bonding (copper ions and their complexes), the cellulose is firmly bonded to the conductive network, which can effectively resist the loss of conductive components due to friction, bending or washing, thereby significantly improving the long-term stability and service life of the sensor signal prepared by the corresponding high-elasticity sensing woven fabric. Attached Figure Description

[0021] Figure 1 This is a schematic flowchart of the preparation method of the highly elastic sensing woven fabric in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structural changes of the highly elastic sensing fabric during the stretching and rebound process in an embodiment of the present invention; Figure 3 This is a photograph of the highly elastic sensing fabric taken under an optical microscope in an embodiment of the present invention. Figure 4 This is a diagram illustrating the sensing and resistance change mechanism of the highly elastic sensing woven fabric in this embodiment of the invention; Figure 5 This is a graph showing the test results of strain and resistivity change rate of the highly elastic sensing fabric in an embodiment of the present invention; Figure 6 This is the result of a 1000-cycle sensing stability test of the highly elastic sensing woven fabric in the embodiment of the present invention. Figure 7 These are microstructure diagrams of cotton fibers before and after treatment with a mixed solution of alkali and conductive nanoparticles in an embodiment of the present invention. Figure 8 This is a cross-sectional structural diagram of cotton fibers after mixed solution treatment in an embodiment of the present invention, showing the penetration results of microparticles; Figure 9 This is a structural mechanism diagram of the physical anchoring of carbon nanoparticles and the chemical bonding of copper ions in cotton fibers after treatment with a mixed solution in this embodiment of the invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0023] In the description of this invention, it should be understood that, unless otherwise stated, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0024] Furthermore, unless otherwise stated, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] Example: Please see Figure 1 The method for preparing the highly elastic sensing woven fabric in a preferred embodiment of the present invention includes the following steps: S1. Use cellulose-based yarn to spin Z-twist single yarn and S-twist single yarn with the first twist respectively. Combine the two Z-twist single yarns to form a Z-twist ply; combine the two S-twist single yarns to form an S-twist ply. S2. Alternately arrange Z-twist and S-twist yarns to form warp yarns; use fiber yarn with the second twist as weft yarn, and mix the warp and weft yarns to form woven fabric; S3. Mix the alkaline solution, conductive nanoparticles and deionized water according to the set mass ratio to obtain a mixed solution; S4. Immerse the woven fabric in the mixed solution, and then rinse and dry the woven fabric after immersion. S5. Repeat step S4 several times to obtain a highly elastic sensing fabric.

[0028] The method for preparing the high-elasticity sensing woven fabric of the present invention firstly forms Z-twist ply and S-twist ply respectively by two Z-twist single yarns and two S-twist single yarns. The two single yarns with the same twisting direction are combined to form ply with internal torsional potential energy. When treated with alkaline solution, the Z-twist ply and S-twist ply release torsional potential energy outward under the swelling effect of alkaline solution. The mutual abutment of the Z-twist ply and S-twist ply restricts the release of torsional force in the ply, so that the Z-twist ply and S-twist ply form a mutually abutting structure. Through the restriction of the warp yarn by the weft yarn, a complete planar structure with internal potential energy is formed. Simultaneously, due to the abutting relationship between the Z-twist and S-twist yarns, the conductive nanoparticles attached to the surface of the woven fabric form stable conductive pathways through mutual contact. When the woven fabric is subjected to tensile force, adjacent Z-twist and S-twist yarns are straightened, reducing or even separating the contact points between them. This partially breaks the pathways formed by the conductive nanoparticles, leading to a significant increase in contact resistance. However, after the strain is released, the Z-twist and S-twist yarns retract, allowing the conductive nanoparticles to return to a stable conductive pathway state, such as... Figures 2-4 As shown. Through this mechanism of reversible contact resistance change, a sensitive and repeatable response of highly elastic sensing woven fabric to strain is achieved.

[0029] Furthermore, the Z-twist yarn and S-twist yarn are formed in the same way in this invention. Taking the Z-twist yarn as an example, two Z-twist single yarns are nested and arranged, with the two Z-twist single yarns abutting each other in the axial shrinkage direction. It can be understood that the formed Z-twist yarn is similar to an integrated spring structure, with the spring wire of the spring structure composed of two Z-twist single yarns arranged side by side. In this form, the two Z-twist single yarns restrain each other after alkali swelling (synchronous shrinkage and expansion), thereby constraining the overall morphology of the Z-twist yarn and facilitating the uniform distribution of conductive nanoparticles on the surface of the woven fabric. On the other hand, by twisting two Z-twist yarns into a Z-twist yarn, this invention can further increase the untwisting force of the Z-twist yarn after swelling, thereby forming a woven fabric with higher elasticity.

[0030] Optionally, the high elasticity of the high elasticity sensing fabric here refers to its better elasticity compared to conventional cellulose-based yarns, and does not mean that the fabric has a specific elastic modulus.

[0031] Further, as an optional embodiment of the present invention, the first twist of the Z-twist single yarn and the S-twist single yarn is 450~550; and the twist of the Z-twist ply and the S-twist ply is 1.3~1.5 times the first twist; and the second twist is 300~350. The highly elastic sensing woven fabric in the present invention serves as the matrix material for the flexible sensor, and it needs to ensure stable and controllable changes in resistance. Therefore, the conductive nanoparticles on the surface of the woven fabric need to be uniformly distributed, so that the resistance of the woven fabric changes stably when subjected to tension. Based on this, the present invention strictly controls the twist of the Z-twist single yarn and the S-twist single yarn, as well as the twist of the Z-twist ply and the S-twist ply, to ensure that the S-twist ply and the Z-twist ply swell to a tight fit after immersion in alkaline solution, and that the ply gradually separates after being stretched. On the other hand, the second twist fiber yarn, which is the weft yarn, is mainly used to assist the warp yarn. The two work together to form the woven fabric structure. By appropriately reducing the second twist, the warp yarn is not disturbed by the weft yarn when the subsequent torsional potential energy is released, thus ensuring the stable change of the resistance of the highly elastic sensing woven fabric.

[0032] As an optional embodiment of the present invention, the Z-twist single yarn and S-twist single yarn are formed from one of cotton fiber, hemp fiber, or viscose fiber; the second twist fiber yarn is formed from one of polyester fiber, nylon fiber, or aramid fiber. Since the woven fabric after the warp and weft yarns are woven needs to be treated in an alkaline solution, the warp yarn needs to be able to attach conductive nanoparticles after treatment to achieve the attachment of conductive materials. Therefore, the warp yarn is made of cotton fiber, hemp fiber, or viscose fiber. The above-mentioned fibers have the characteristics of alkali swelling, etching, hydroxyl content for compounding, and skin-friendly properties. After alkaline treatment, the surface of the warp yarn forms attachment sites for conductive nanoparticles and forms a spring structure. The weft yarn mainly serves as the constraint structure of the warp yarn. It is made of polyester fiber, nylon fiber, or aramid fiber, which gives it good alkali resistance, high strength, dimensional stability, and an inert surface. It can serve as the fabric skeleton, maintain a sparse structure, and is not affected by the alkaline solution, ensuring the stable deformation of the woven fabric along the warp direction and ensuring the stable change of resistance of the highly elastic sensing woven fabric under tension.

[0033] As an optional embodiment of the present invention, the ratio of the spacing between two adjacent fiber yarns to the diameter of the fiber yarn in the weft yarn is 2 to 4. The weft yarn acts as the supporting skeleton for the elasticity release of the warp yarn. By controlling the spacing between the weft yarns and the diameter ratio, better stretching space can be reserved for the warp yarn. When the weft yarn is too tightly arranged, the warp yarn will be firmly bound, preventing it from bending outwards during subsequent alkali treatment. The warp yarn cannot effectively form a spring-like structure, and cannot achieve a stable change in resistance during subsequent stretching. When the weft yarn is loosely arranged, the weft yarn loses its binding force on the warp yarn, resulting in a loose overall fabric arrangement. During subsequent multiple stretching processes, the warp and weft yarns are prone to relative slippage, leading to a reduction in the durability of the highly elastic sensing fabric.

[0034] As an optional embodiment of the present invention, in S3, the alkaline solution is a sodium hydroxide solution, and the mass ratio of the alkaline solution, conductive nanoparticles, and deionized water is 1:3:10 to 3:8:10. While all alkaline solutions can induce swelling in warp yarns, sodium hydroxide has smaller sodium ions and stronger hydration, resulting in the most significant swelling effect. This can induce an irreversible crystal transformation in the fibers, facilitating the subsequent adhesion of the conductive nanoparticles. The ratio of alkaline solution, conductive nanoparticles, and deionized water here is specifically for the preparation of sodium hydroxide solutions.

[0035] Of course, alternatively, in addition to sodium hydroxide solution, other alkaline solutions such as potassium hydroxide solution, lithium hydroxide solution, or ammonia water can also be used as treatment solutions for cellulose-based yarns.

[0036] like Figures 7-9 As shown, in an optional embodiment of the present invention, the conductive nanoparticles are a mixture of carbon nanotubes and copper powder, with a mass ratio of carbon nanotubes to copper powder of 1:1 to 1:2, and the copper powder particle size ranging from 100 nm to 1 μm. The micro-etching effect of sodium hydroxide solution on the cellulose surface creates microcrack structures on the yarn surface, which facilitates the physical embedding and anchoring of carbon nanotubes, making it easier to form conductive bridging sections at the warp yarn junctions, such as... Figure 7 As shown. Copper powder, under the action of alkaline solution, generates copper ions and their complexes, which can undergo coordination reactions with the hydroxyl groups on the cellulose macromolecular chain, thereby forming a stable bond between cellulose and the conductive material, such as... Figure 8 , Figure 9 As shown. Among them, Figure 8 The cross-sectional structure diagram of cotton fiber shows the good integration of conductive nanoparticles with cotton fiber; Figure 9 The diagrams show the binding of cotton fibers with carbon nanotubes and copper ions, respectively. Figure 9 The number 1 indicates the good physical bonding ability between carbon nanotubes and cellulose. Figure 9The number 2 indicates the coordination reaction between copper ions and their complexes and the hydroxyl groups on the cellulose molecular chain. Through the dual combination of physical anchoring (carbon nanotubes) and chemical bonding (copper ions and their complexes), the cellulose is firmly bonded to the conductive network, effectively resisting the loss of conductive components due to friction, bending, or washing. This significantly improves the long-term stability and lifespan of the sensor signal prepared from the corresponding highly elastic sensing fabric.

[0037] As an optional embodiment of the present invention, the immersion time of the woven fabric in step S4 is 30-60 minutes, and the immersion temperature is 30-90°C. Further optionally, the drying temperature in step S4 is 50-80°C. The immersion time, immersion temperature, and drying temperature in steps S4 and S5 are preferred conditions for the preparation method of the high-elasticity sensing woven fabric of the present invention. By controlling these conditions, a high-elasticity sensing woven fabric with high resilience and stable resistance change under tension can be obtained.

[0038] The present invention also includes a highly elastic sensing fabric, which is prepared by the above-described method for preparing highly elastic sensing fabric.

[0039] Furthermore, the present invention also includes a fabric sensor comprising the aforementioned highly elastic sensing fabric.

[0040] Example 1: S1: Combed cotton fiber is selected as the cellulose-based fiber raw material, and a single yarn with a linear density of 20 tex is spun. Z-twist single yarn with a twist coefficient of 680 and S-twist single yarn with a twist coefficient of 680 are prepared separately; then the two Z-twist single yarns are combined and twisted to make Z-twist ply yarn with a twist coefficient of 500; the two S-twist single yarns are combined and twisted to make S-twist ply yarn with a twist coefficient of 500.

[0041] S2: The Z-twist yarn and S-twist yarn are arranged alternately in a 1:1 ratio as warp yarns; polyester filament with a twist coefficient of 320 is selected as weft yarn; plain weave is used for weaving, and the ratio of weft yarn spacing W to weft yarn diameter d (W / d) is controlled at 3 by adjusting the weft yarn density to form a blended woven fabric with a sparse weft yarn structure.

[0042] S3: Mix NaOH, conductive nanoparticles and deionized water in a weight ratio of 2:5:10; wherein the conductive nanoparticles are a mixture of carbon nanotubes and copper powder in a weight ratio of 1:1.5, and the copper powder has a particle size of 300 nm. After ultrasonic dispersion for 30 min, a uniform mixed solution is formed.

[0043] S4: Immerse the blended fabric in the mixed solution and treat it at 60 ℃ for 45 min; take out the treated blended fabric, rinse it repeatedly with deionized water until neutral, and then dry it at 65 ℃.

[0044] S5: Repeat step S4 twice to obtain a highly elastic sensing fabric. The resulting fabric exhibits obvious reversible helical untwisting-retwisting behavior when stretched in the warp direction, with a strain range of over 50%. The resistance shows a stable linear relationship with strain, making it suitable for human motion monitoring.

[0045] Example 2: This embodiment adjusts the material system and process parameters to obtain higher sensitivity strain sensing performance.

[0046] S1: Viscose fiber is selected as the cellulose-based fiber raw material and a single yarn with a linear density of 18 tex is spun; Z-twist single yarn and S-twist single yarn with a twist coefficient of 750 are prepared respectively; the two Z-twist single yarns are twisted together to form a Z-twist ply with a twist coefficient of 520; the two S-twist single yarns are twisted together to form an S-twist ply with a twist coefficient of 520.

[0047] S2: Z-twist yarns and S-twist yarns are arranged alternately in a 1:1 ratio as warp yarns; nylon fiber yarns with a twist coefficient of 340 are selected as weft yarns; plain weave is adopted, and the ratio of weft yarn spacing to weft yarn diameter (W / d) is controlled at 2.5 to form a more significant sparse weft yarn structure.

[0048] S3: Mix NaOH, conductive nanoparticles and deionized water in a weight ratio of 3:8:10; the conductive nanoparticles are a mixture of carbon nanotubes and copper powder in a weight ratio of 1:2, and the copper powder has a particle size of 800 nm. The mixture is dispersed by mechanical stirring and ultrasonication for 40 min. S4: Immerse the blended fabric in the mixed solution and treat it at 85 ℃ for 60 min; rinse the treated fabric thoroughly with deionized water to remove residual alkali, and then dry it at 75 ℃.

[0049] S5: Repeat S4 four times to improve the stability of the conductive network and the consistency of strain response. The resulting strain fabric sensor exhibits high linearity and sensitivity within a 60% strain range, and has good resolution of minute strain changes, making it suitable for wearable physiological signal detection and fine motion recognition.

[0050] Furthermore, the highly elastic sensing fabric prepared in the above embodiments was tested to obtain... Figure 5 , Figure 6 The test chart in the image. Based on... Figure 5 It can be seen that the resistance value of the highly elastic sensing fabric prepared by this invention is basically positively correlated with its strain within the 100% strain range, indicating that the resistance value of the highly elastic sensing fabric has good controllability under tensile force. Based on Figure 6It can be seen that the highly elastic sensing fabric prepared by this invention maintains a basically stable resistance change during long-term cyclic sensing stability testing, ensuring that the sensor prepared by the highly elastic sensing fabric has a long service life and stable operation.

[0051] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a highly elastic sensing woven fabric, characterized in that, Includes the following steps: S1. Use cellulose-based yarn to spin Z-twist single yarn and S-twist single yarn with the first twist respectively. Combine the two Z-twist single yarns to form a Z-twist ply; combine the two S-twist single yarns to form an S-twist ply. S2. Alternately arrange Z-twist and S-twist yarns to form warp yarns; use fiber yarn with the second twist as weft yarn, and mix the warp and weft yarns to form woven fabric; S3. Mix the alkaline solution, conductive nanoparticles and deionized water according to the set mass ratio to obtain a mixed solution; S4. Immerse the woven fabric in the mixed solution, and then rinse and dry the woven fabric after immersion. S5. Repeat step S4 several times to obtain a highly elastic sensing fabric.

2. The method for preparing the highly elastic sensing woven fabric according to claim 1, characterized in that, The first twist is 450~550; the twist of the Z-twist yarn and the S-twist yarn is 1.3~1.5 times the first twist; the second twist is 300~350.

3. The method for preparing the highly elastic sensing woven fabric according to claim 1, characterized in that, The Z-twist single yarn and the S-twist single yarn are formed from one of cotton fiber, linen fiber or viscose fiber; the second twist fiber yarn is formed from one of polyester fiber, nylon fiber or aramid fiber.

4. The method for preparing the highly elastic sensing woven fabric according to claim 1, characterized in that, The ratio of the spacing between two adjacent fiber yarns in the weft yarn to the diameter of the fiber yarn is between 2 and 4.

5. The method for preparing the highly elastic sensing woven fabric according to claim 1, characterized in that, The alkaline solution in S3 is a sodium hydroxide solution, and the mass ratio of the alkaline solution, conductive nanoparticles and deionized water is 1:3:10 to 3:8:

10.

6. The method for preparing the highly elastic sensing woven fabric according to claim 1, characterized in that, The conductive nanoparticles are a mixture of carbon nanotubes and copper powder, with a mass ratio of carbon nanotubes to copper powder of 1:1 to 1:2, and the copper powder particle size range of 100 nm to 1 μm.

7. The method for preparing the highly elastic sensing woven fabric according to claim 1, characterized in that, The immersion time for the woven fabric in S4 is 30-60 minutes, and the immersion temperature is 30-90°C.

8. The method for preparing the highly elastic sensing woven fabric according to claim 1, characterized in that, The drying temperature in S4 is 50~80℃.

9. A highly elastic sensing fabric, characterized in that, It is prepared by the method for preparing a highly elastic sensing woven fabric as described in any one of claims 1 to 8.

10. A fabric sensor, characterized in that, Including the highly elastic sensing fabric as described in claim 9.

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