A kind of heterogeneous yarn based on friction spinning and its preparation method and application

Abstract

The present invention discloses a heterogeneous yarn based on friction spinning, and its preparation method and application, which belongs to the field of sensor material technology. The heterogeneous yarn is prepared by friction spinning technology, and conductive filaments are used as core filaments and outer filaments, which are combined with short fiber whiskers to form an interlayer stitched and interlocked structure. The outer filament feeding assembly applies periodic harmonic migration to the outer filaments to achieve controllable construction of the yarn. Compared with the prior art, the heterogeneous yarn of the present invention has excellent wear resistance and dielectric sensing performance, and the mechanical stability and sensing sensitivity of the yarn are optimized by adjusting the spinning parameters and filament migration parameters. The heterogeneous yarn of the present invention not only improves the durability of the yarn, but also realizes multi-site differentiated sensing of one-dimensional yarn, providing a new solution for smart wearable devices.

Description

Technical Field

[0001] The present invention relates to the technical field of sensor materials, and in particular to a friction-spinning-based heterogeneous yarn and a preparation method and application thereof. Background Art

[0002] With the development of smart wearable technology, flexible pressure-sensing yarns have shown great potential for application in smart textiles. These yarns can be integrated into everyday clothing, directly contacting the human body and monitoring physiological information such as movement and posture changes. However, existing yarn sensors are susceptible to damage to their electrical and mechanical properties under repeated deformation, resulting in reduced interfacial bonding strength, which seriously affects the durability and sensing performance of smart textiles.

[0003] Conventional capacitive pressure sensing yarns are primarily composed of a composite of conductive materials and traditional fiber materials. When these yarns are subjected to mechanical deformations such as friction, bending, stretching, compression, and washing, the interfacial bonding between the conductive material and the fiber decreases, affecting the sensor's stability and cycling stability. To address this issue, researchers have attempted to enhance the interfacial strength between the conductive material and the fiber substrate through coating techniques. However, the majority of the conductive material remains exposed on the yarn surface, challenging the sensor's cycling stability under large deformations or sustained friction.

[0004] In addition, transferring conductive materials into the yarn body is another strategy to improve sensing stability. However, conductive fillers such as carbon nanotubes, graphene, and silver nanoparticles are difficult to evenly disperse in polymer fibers, limiting the improvement of the sensor's electrical performance. The core-wrapped, wrapped, and braided structures of yarns have high mechanical stability, but these structures are prone to delamination during actual use, making it difficult to maintain a stable yarn structure and reducing the yarn's mechanical properties.

[0005] Friendly interactive interfaces and intelligent recognition for smart wearable devices are crucial for the development of novel human-computer interaction and intelligent devices. Traditional multi-point yarn / fabric sensor arrays struggle to achieve high-resolution sensing and face challenges such as data acquisition and integration difficulties. Therefore, achieving simpler and more efficient differentiated signal interaction interfaces for smart wearable devices through yarn structure manipulation is a significant challenge.

[0006] Chinese invention patent CN114739280A discloses a multi-component nanocarbon fiber yarn strain sensor and its preparation method. First, carbon black / carbon nanotubes / graphene are uniformly dispersed in a dimethylformamide / tetrahydrofuran mixed solvent. Thermoplastic polyurethane particles are then dissolved in the dispersion to prepare a spinning solution. Nanofiber bundles are then formed by electrospinning, which are then twisted to produce a conductive yarn composed of multi-component nanocarbon fibers. Finally, electrodes are formed at both ends of the yarn using tin foil and conductive silver glue to create the multi-component nanocarbon fiber yarn strain sensor. This preparation method is simple and reasonable, enabling the mass production of braidable and washable conductive nanofiber yarns, which can be used directly as strain sensors. The yarn sensor can be directly woven or sewn into clothing, sports equipment such as wristbands and kneepads, and other items on the human body, such as plasters applied to the human body, to detect human movement and physiological information such as breathing and heartbeat. However, the multi-component nanocarbon fiber yarn strain sensor prepared in this manner suffers from poor wear resistance and dielectric sensing performance, and the complex preparation process does not fully meet the material requirements for smart wearables.

[0007] Chinese invention patent CN109023614A discloses a flexible intelligent yarn sensor comprising a conductive yarn, a yarn holding component, a yarn twist control mechanism, and a tension mechanism. The yarn holding component comprises an insulating support rod, a hinge connected to the insulating support rod and a lower insulating support plate, a fixed electrode clamp connected to the hinge, a side insulating plate connected to the lower insulating support plate, and a rotating electrode clamp connected to the side insulating plate. The yarn twist control mechanism is connected to the rotating electrode clamp and drives the rotating electrode clamp to rotate to change the twist number of the conductive yarn. The tension mechanism comprises a tension rod and a tension adjustment slider mounted on the tension rod, the tension rod being connected to the fixed electrode clamp. The conductive yarn is positioned between the fixed electrode clamp and the rotating electrode clamp. This invention utilizes the flexibility of conductive fibers to adjust the resistance according to the set twist number of the conductive yarn. However, this flexible intelligent yarn sensor suffers from poor dielectric sensing performance and complex equipment, making it unsuitable for use on existing industrial equipment.

[0008] Chinese invention patent CN108896199A discloses a stretchable yarn sensor and its preparation method, relating to the field of flexible sensor technology. The sensor comprises an elastic yarn and an electrode yarn wound in an S-shaped spiral around the surface of the elastic yarn. The electrode yarn comprises a sensitive fiber, electrode wires connected to both ends of the sensitive fiber, and an encapsulation layer coated on the surfaces of the sensitive fiber and the electrode wires. The sensitive fiber comprises a base fiber and a temperature-sensitive or humidity-sensitive material coated on the base fiber. The yarn sensor uses the electrode wires as electrodes and the encapsulation layer as a dielectric material, monitoring temperature or humidity changes by changes in the resistance of the sensitive fiber. The invention also provides a method for preparing the yarn sensor. The resulting yarn sensor exhibits excellent stability and high sensitivity. Its entire structure is made of flexible materials, making it lightweight and adaptable to human skin, enabling long-term, real-time monitoring. However, the electrode yarns of this yarn sensor are wrapped around the outside of the yarn, making it extremely uncomfortable to wear and the sensing effect susceptible to environmental influences. Summary of the Invention

[0009] In response to the above problems, the present invention provides a heterogeneous yarn based on friction spinning, a preparation method and application thereof, aiming to improve the durability and sensing performance of the yarn through innovative yarn structure design and material combination, while realizing multi-site differentiated sensing of one-dimensional yarn, providing a new solution for smart wearable devices.

[0010] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0011] A method for preparing heterogeneous yarn based on friction spinning is as follows:

[0012] Friction spinning is adopted, and the conductive filaments are used as the core filaments and the outer filaments respectively, and the short fibers are used as the short fiber whiskers; the core filaments and the short fiber whiskers are fed in the conventional friction spinning method, and the short fiber whiskers first pass through the feeding roller, and then are stretched by the drafting roller, and then enter the combing roller for combing, and enter the fiber coagulation zone in the friction roller. The outer filament feeding assembly applies periodic harmonic migration to the outer filaments, and the outer filament feeding assembly drives the outer filaments to perform harmonic migration in the fiber coagulation zone, realizing the controllable construction of interlayer stitched and embedded composite yarns. During the friction spinning process, the short fiber whiskers and the outer filaments are successively wound around the outside of the core filament to form an outer layer of the core filament. The outer layer is an interlocking structure of short fibers and conductive filaments to obtain a heterogeneous yarn.

[0013] The outer filament feeding assembly is arranged outside the friction roller and can move along the core filament direction. The feeding point of the outer filament feeding assembly is arranged in front of the combing roller.

[0014] The outer covering filament feeding assembly is used for feeding the outer covering filament into the friction roller along the core filament direction and embedding the outer covering filament with the short fiber strips and wrapping them around the core filament.

[0015] The conductive filament is at least one of a silver-plated filament, stainless steel, copper, and aluminum wire.

[0016] The short fiber is at least one of cotton fiber, wool fiber, viscose fiber, polyester fiber, polyamide fiber, polyacrylonitrile fiber, polypropylene fiber, polylactic acid fiber, flax fiber, jute fiber, bamboo fiber, modal fiber, and lyocell fiber.

[0017] The width of the fiber coagulation zone ranges from 0.1 to 0.4 m.

[0018] The parameters of the friction spinning are: the friction roller speed is 3000-5000 r / min, the carding roller speed is 3000-5000 r / min, the feeding speed of the short fiber sliver is 0.3-1 m / min, the output speed is 15-20 m / min, the curling speed is 15-20 m / min, and the mass ratio of the short fiber to the core yarn in the heterogeneous yarn is 5-20:1.

[0019] The periodic harmonic migration distance of the outer filament feeding component is 0.2 to 0.4 m, and the speed is 2 to 6 m / min.

[0020] The friction-spinning-based heterogeneous yarn prepared by the present invention is used for smart textiles and wearable devices.

[0021] The theoretical basis and design of the present invention are mainly based on the fiber tension transfer theory, friction spinning technology and dielectric sensing principles. The invention uses the fiber tension transfer theory to apply periodic harmonic migration to the conductive filaments during the friction spinning process to achieve an interlayer stitched and interlocked composite structure of conductive filaments and short fibers, thereby constructing a yarn with a heterogeneous structure. This structural design aims to improve the mechanical stability and wear resistance of the yarn, and at the same time, by regulating the spatial distribution of the filaments, achieve differentiated dielectric sensing performance of the yarn in one dimension, providing a highly durable and highly sensitive pressure sensing solution for smart wearable devices. In addition, it also involves in-depth research on the relationship between yarn structure and performance, including the impact of heterogeneous structure on yarn durability and sensing performance, in order to reveal the collective stress transfer mechanism and failure law of multi-level structural fibers.

[0022] These contents together constitute the core of this invention, which aims to improve the mechanical stability and dielectric sensing performance of the yarn through the innovative design of the heterogeneous yarn structure, and provide new ideas and technical support for the development of smart wearable devices.

[0023] Compared with the existing technology, it has the following beneficial effects:

[0024] 1) The present invention applies periodic harmonic migration during the friction spinning process, so that the conductive filaments and short fibers form an interlayer stitched and interlocked structure, which significantly improves the mechanical stability and wear resistance of the yarn and solves the problem that the performance of traditional sensing yarns is easily damaged under repeated deformation.

[0025] 2) The present invention utilizes a heterogeneous structure to achieve multi-site differentiated sensing of the yarn in one dimension. By regulating the distribution of conductive filaments, the dielectric sensing performance of the yarn is optimized, the sensitivity and response time of the sensor are improved, and more accurate and efficient sensing capabilities are provided for smart wearable devices.

[0026] 3) The heterogeneous yarn of the present invention not only maintains high durability and sensing performance, but also has good softness and thermal and moisture comfort, is suitable for direct contact with the skin, and meets the dual requirements of comfort and functionality in practical applications of smart wearable devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the spinning of the heterogeneous yarn according to Example 1 of the present invention;

[0028] Figure 2 Schematic diagram of the heterogeneous yarn structure and filament distribution according to Example 1 of the present invention;

[0029] Figure 3 The geometric model of the heterogeneous yarn structure described in Example 1 of the present invention;

[0030] Figure 4 The displacement S, velocity v, and distance r between two filaments of the outer filament feeding assembly of the heterogeneous yarn described in Example 1 of the present invention are shown;

[0031] Figure 5 Schematic diagram of the dielectric test model of the heterogeneous yarn described in Example 1 of the present invention; (a) Schematic diagram of the dielectric sensing mechanism model of the heterogeneous sensing yarn; (b) Schematic diagram of the yarn compression simulation result;

[0032] Figure 6 Wear resistance test and microscopic magnification of the heterogeneous yarn described in Example 1 of the present invention; (a) Photo of filament harmonic migration yarn; (b) Optical microscope photo of yarn appearance; (c) Microscope photo of filament distribution in the yarn cross section; (d) Wear resistance test of heterogeneous structure yarn.

[0033] Figure 1 The markings of the components are as follows:

[0034] 1. Outer filament; 2. Core filament; 3. Staple fiber strand; 4. Outer filament feeding assembly; 5. Friction roller; 6. Fiber coagulation area; 7. Combing roller; 8. Feed roller; 9. Drafting roller; 10. Inhomogeneous yarn; The outer filament 1 reciprocates between AB through the outer filament feeding assembly 4, and the AB direction is parallel to the core filament direction. DETAILED DESCRIPTION

[0035] Main sources of substances:

[0036] Silver-plated filament, denier 100D, item number: HW-001, Hangzhou Hengwei Wire and Tape Co., Ltd.

[0037] Cotton fiber slivers, fiber length 28-35cm, cotton fiber sliver weight 150g / m.

[0038] The remaining raw materials in the examples and comparative examples of the present invention are all commercially available products.

[0039] The design idea of ​​this invention is to use friction spinning technology to apply periodic harmonic migration to the conductive filaments during the spinning process to achieve an interlayer stitching and interlocking composite structure of conductive filaments and short fibers, thereby constructing a yarn with a heterogeneous structure. This structure not only enhances the mechanical stability and wear resistance of the yarn, but also achieves differentiated dielectric sensing performance of the yarn in one dimension by regulating the spatial distribution of the filaments, providing a highly durable and highly sensitive pressure sensing solution for smart wearable devices.

[0040] Example 1

[0041] A method for preparing heterogeneous yarn based on friction spinning is as follows:

[0042] Friction spinning is adopted, and silver-plated filaments are used as core filaments 2 and outer filaments 1 respectively, and cotton fiber whiskers are used as short fiber whiskers 3; the core filaments 2 and short fiber whiskers 3 are fed in a conventional friction spinning method, and the short fiber whiskers 3 first pass through the feeding roller 8, and then are drafted by the drafting roller 9, and then enter the combing roller 7 for combing, and enter the fiber coagulation area 6 in the friction roller 5, and periodic harmonic migration is applied to the outer filaments 1 through the outer filament feeding component 4, and the outer filament feeding component 4 drives the outer filaments 1 to perform harmonic migration in the fiber coagulation area 6, so as to realize the controllable construction of interlayer stitched and interlocked composite yarns. In the friction spinning process, the short fiber whiskers 3 and the outer filaments 1 are sequentially wound around the outside of the core filament 2 to form an outer covering of the core filament 2, and the outer covering is an interlocking structure of cotton fibers and silver-plated filaments, thereby obtaining a heterogeneous yarn 10;

[0043] The outer filament feeding assembly 4 is arranged outside the friction roller 5 and can move along the direction of the core filament 2. The feeding point of the outer filament feeding assembly 4 is arranged in front of the combing roller 7;

[0044] The outer covering filament feeding assembly 4 is used to feed the outer covering filament 1 into the friction roller 5 along the direction of the core filament 2 and embed the short fiber strands 3 around the core filament 2;

[0045] The parameters of the friction spinning are as follows: the speed of the friction roller 5 is 4000 r / min, the speed of the carding roller 7 is 4000 r / min, the feeding speed of the short fiber sliver 3 is 0.4 m / min, the output speed is 18 m / min, the curling speed is 18 m / min, the mass ratio of cotton fiber to core filament 2 in the heterogeneous yarn is 8:1; the periodic harmonic migration distance of the outer filament feeding component 4 is 0.3 m, and the speed is 4 m / min.

[0046] Example 2

[0047] A method for preparing a heterogeneous yarn based on friction spinning is basically the same as that of Example 1, with the only difference being that the periodic harmonic migration distance of the outer filament feeding assembly 4 is 0.2 m and the speed is 4 m / min.

[0048] Example 3

[0049] A method for preparing a heterogeneous yarn based on friction spinning is basically the same as that of Example 1, with the only difference being that the periodic harmonic migration distance of the outer filament feeding assembly 4 is 0.4 m and the speed is 4 m / min.

[0050] Example 4

[0051] A method for preparing a heterogeneous yarn based on friction spinning is basically the same as that of Example 1, with the only difference being that the periodic harmonic migration distance of the outer filament feeding assembly 4 is 0.3 m and the speed is 2 m / min.

[0052] Example 5

[0053] A method for preparing a heterogeneous yarn based on friction spinning is basically the same as that of Example 1, with the only difference being that the periodic harmonic migration distance of the outer filament feeding assembly 4 is 0.3 m and the speed is 3 m / min.

[0054] Example 6

[0055] A method for preparing a heterogeneous yarn based on friction spinning is basically the same as that of Example 1, with the only difference being that the periodic harmonic migration distance of the outer filament feeding assembly 4 is 0.3 m and the speed is 5 m / min.

[0056] Example 7

[0057] A method for preparing a heterogeneous yarn based on friction spinning is basically the same as that of Example 1, with the only difference being that the periodic harmonic migration distance of the outer filament feeding assembly 4 is 0.3 m and the speed is 6 m / min.

[0058] Comparative Example 1

[0059] A method for preparing friction-spun core-spun yarn is as follows:

[0060] Friction spinning is used, with two identical silver-plated filaments as core yarns 2 and cotton fiber whiskers as staple fiber whiskers 3. The core yarns 2 and staple fiber whiskers 3 are fed in a conventional friction spinning method. The staple fiber whiskers 3 first pass through a feeding roller 8, then are drafted by a drafting roller 9, and then enter a combing roller 7 for combing. The staple fiber whiskers 3 then enter a fiber coagulation zone 6 in a friction roller 5, where they are sequentially wound around the outer side of the core yarn 2 to form an outer covering of the core yarn 2. The outer covering is cotton fiber, thus obtaining a friction-spun core-spun yarn.

[0061] The friction spinning parameters are as follows: the speed of the friction roller 5 is 4000 r / min, the speed of the carding roller 7 is 4000 r / min, the feeding speed of the short fiber sliver 3 is 0.4 m / min, the output speed is 18 m / min, the curling speed is 18 m / min, and the mass ratio of cotton fiber to core filament 2 in the heterogeneous yarn is 4:1.

[0062] Comparative Example 2

[0063] A method for preparing friction-spun wrapped yarn is as follows:

[0064] Friction spinning is adopted, with silver-plated filaments as core filaments 2 and outer filaments 1, and cotton fiber whiskers as short fiber whiskers 3; the core filaments 2 and short fiber whiskers 3 are fed in a conventional friction spinning manner, the short fiber whiskers 3 first pass through a feeding roller 8, then are drafted by a drafting roller 9, then enter a combing roller 7 for combing, and enter a fiber coagulation zone 6 in a friction roller 5, the outer filament feeding assembly 4 fixes the outer filament 1 in the middle position of the periodic harmonic migration, and during the friction spinning process, the short fiber whiskers 3 and the outer filament 1 are sequentially wound around the outer side of the core filament 2 to form an outer covering of the core filament 2, thereby obtaining a friction-spun wrapped yarn;

[0065] The outer filament feeding assembly 4 is arranged outside the friction roller 5 and fixed at the middle position of the periodic harmonic migration. The feeding point of the outer filament feeding assembly 4 is arranged in front of the combing roller 7.

[0066] The parameters of the friction spinning are: the speed of the friction roller 5 is 4000 r / min, the speed of the carding roller 7 is 4000 r / min, the feeding speed of the short fiber sliver 3 is 0.4 m / min, the output speed is 18 m / min, the curling speed is 18 m / min, and the mass ratio of cotton fiber to core filament 2 in the heterogeneous yarn is 8:1.

[0067] Test Example 1

[0068] Wear resistance test

[0069] The yarns prepared in this example and the comparative example were subjected to wear resistance testing using an FFZ622 yarn abrasion tester according to Chinese standard FZ / T01058-1999. The yarns were straightened using a 30g weight and rubbed with 600-grit sandpaper using a reciprocating friction roller method until they broke. Each yarn was tested 60 times, and the number of breaks was recorded and averaged. The test results are shown in Table 1.

[0070] Table 1

[0071]

[0072] Test Example 2

[0073] Study on the dielectric sensing mechanism of heterogeneous composite yarns

[0074] Pressure sensing data from different locations within a harmonic cycle in a composite yarn are collected and fitted to analyze the differences in sensing performance at different locations along the yarn's one-dimensional direction. The influence of filament distribution on the composite yarn's sensing sensitivity, detection range, response time, and cycle durability is explored. The structure-activity relationship between various integrated design parameters and sensing performance is clarified, and feedback is used to guide the integrated fabrication of flexible smart wearable devices.

[0075] It is planned to verify the influence of heterogeneous structure on yarn sensing performance by combining finite element simulation analysis with experiments, and clarify the dielectric sensing mechanism of composite yarn. The capacitance formula of capacitive pressure sensor is:

[0076] C=k0(lw / d0)

[0077] Where k0 is the dielectric constant of the fiber layer, l, w, and d0 refer to the length, width, and equivalent distance between the harmonic migration filaments. When the yarn cross section is compressed, the area lw between the filaments remains unchanged, while the distance d decreases. The dielectric constant of the fiber composite after compression is k, ΔP is the pressure change, and the sensitivity of the yarn capacitance change, S, can be expressed as:

[0078] S=ΔC / ΔP=(k / d-k0 / d0) / ΔP

[0079] The test results are shown in Table 2.

[0080] Table 2

[0081]

[0082] It can be seen from the data in Tables 1 and 2 that the heterogeneous yarn prepared in Example 1 has the best wear resistance and dielectric sensing performance.

[0083] The reason why the heterogeneous yarn in Example 1 exhibits the best wear resistance and dielectric sensing performance may be that the combination of the periodic displacement distance of 0.3m and the speed of 4m / min of the outer filament feeding assembly 4 provides the yarn with an ideal wrapping and interlocking effect. This combination may provide the yarn with the best wrapping and interlocking effect. The moderate periodic displacement distance can ensure that the outer filament 1 performs effective harmonic migration within the width range of the friction-spun yarn, while the speed setting ensures the uniform combination of the outer filament 1 and the short fiber strip 3. This parameter combination helps to form a heterogeneous yarn structure within the period, enhances the wear resistance of the yarn, and makes the pressure sensing data more stable and accurate, thereby improving the dielectric sensing sensitivity and detection range, making the yarn perform optimally in terms of functionality and practicality.

[0084] The embodiment shows better wear resistance and dielectric sensing performance than comparative examples 1 and 2, which may be due to the periodic displacement combination of its specific outer filament feeding assembly 4, which provides better structural uniformity and stability for the yarn. This specific parameter setting may make the outer filament 1 more tightly combined with the core filament 2 and the short fiber whiskers, thereby enhancing the wear resistance of the yarn. At the same time, this structure is also conducive to improving the dielectric sensing performance of the yarn, because there is a certain distance between the distributed conductive materials (silver-plated filaments), which makes the change of capacitance more sensitive when the pressure changes. Therefore, this optimized parameter setting helps to improve the functionality and practicality of the yarn, making it perform best in wear resistance and sensing performance.

Claims

1. A method for preparing heterogeneous yarn based on friction spinning, characterized in that: Here’s how: Friction spinning is adopted, and the conductive filament is used as the core filament (2) and the outer filament (1), and the short fiber is used as the short fiber sliver (3); the core filament (2) and the short fiber sliver (3) are fed in a conventional friction spinning method, and the short fiber sliver (3) first passes through the feeding roller (8), and then is stretched by the drawing roller (9), and then enters the combing roller (7) for combing, and enters the fiber coagulation area (6) of the friction roller (5), and is fed to the outer filament feeding component (4) for the outer filament. The filaments (1) are subjected to periodic harmonic migration, and the outer filament feeding assembly (4) drives the outer filaments (1) to perform harmonic migration in the fiber cohesion zone (6), thereby realizing the controllable construction of interlayer stitched interlocking composite yarns. During the friction spinning process, the short fiber strands (3) and the outer filaments (1) are sequentially wound around the outside of the core filament (2) to form an outer layer of the core filament (2), and the outer layer is an interlocking structure of the short fibers and the conductive filaments, thereby obtaining a heterogeneous yarn (10); The conductive filament is at least one of a silver-plated filament, stainless steel, copper, and aluminum wire; The width of the fiber coagulation zone (6) ranges from 0.1 to 0.4 m; The periodic harmonic migration distance of the outer filament feeding assembly (4) is 0.3 m, and the speed is 4 m / min.

2. The method for preparing heterogeneous yarn based on friction spinning according to claim 1, characterized in that: The outer filament feeding assembly (4) is arranged outside the friction roller (5) and can move along the direction of the core filament (2). The feeding point of the outer filament feeding assembly (4) is arranged in front of the combing roller (7).

3. The method for preparing heterogeneous yarn based on friction spinning according to claim 1, characterized in that: The outer covering filament feeding assembly (4) is used to feed the outer covering filament (1) into the friction roller (5) along the direction of the core filament (2) and embed the outer covering filament (1) with the short fiber strands (3) to be wrapped around the core filament (2).

4. The method for preparing heterogeneous yarn based on friction spinning according to claim 1, characterized in that: The short fiber is at least one of cotton fiber, wool fiber, viscose fiber, polyester fiber, polyamide fiber, polyacrylonitrile fiber, polypropylene fiber, polylactic acid fiber, flax fiber, jute fiber, bamboo fiber, modal fiber, and lyocell fiber.

5. The method for preparing heterogeneous yarn based on friction spinning according to claim 1, characterized in that: The parameters of the friction spinning are as follows: the speed of the friction roller (5) is 3000~5000r / min, the speed of the combing roller (7) is 3000~5000r / min, the feeding speed of the short fiber sliver (3) is 0.3~1m / min, the output speed is 15~20m / min, the curling speed is 15~20m / min, and the mass ratio of the short fiber to the core filament (2) in the heterogeneous yarn is 5~20:

1.

6. A non-homogeneous yarn based on friction spinning, characterized in that: Prepared by the preparation method according to any one of claims 1 to 5.

7. The use of the friction-spun heterogeneous yarn according to claim 6, characterized in that: For use in smart textiles and wearable devices.

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