Heterogeneous yarn based on friction spinning and preparation method and application thereof

Abstract

The invention discloses a heterogeneous yarn based on friction spinning and a preparation method and application thereof, and belongs to the technical field of sensor materials, the heterogeneous yarn is prepared through the friction spinning technology, conductive filaments serve as core filaments and outer wrapping filaments and are combined with short fiber strands, and an interlayer sewing and mutual embedding type structure is formed. The outer wrapping filament feeding assembly applies periodic harmonic migration to the outer wrapping filaments, and controllable construction of the yarn is achieved. Compared with the prior art, the heterogeneous yarn has excellent wear resistance and dielectric sensing performance, and the mechanical stability and sensing sensitivity of the yarn are optimized by adjusting spinning parameters and filament migration parameters. According to the heterogeneous yarn, the durability of the yarn is improved, multi-site differential sensing of the one-dimensional yarn is achieved, and a new solution is provided for intelligent wearable equipment.

Description

Technical Field

[0001] The 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 application potential in the field of smart textiles. These yarns can be integrated into daily clothing and directly contact the human body to monitor physiological information such as human movement and posture changes. However, the electrical and mechanical properties of existing yarn sensors are easily damaged under repeated deformation, resulting in reduced interfacial bonding strength, which seriously affects the durability and sensing performance of smart textiles.

[0003] Traditional capacitive pressure sensing yarns are mainly composed 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 force between the conductive material and the fiber will decrease, thus affecting the stability and cycle stability of the sensor. To solve this problem, researchers have tried to enhance the interface strength between the conductive material and the fiber substrate through coating technology, but most of the conductive material is directly exposed to the outside of the yarn, which challenges the cycle stability of the sensor under large deformation or continuous friction.

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

[0005] Friendly interactive interfaces and intelligent recognition of smart wearable devices are of great significance in the development of new human-computer interaction and smart devices. Traditional multi-point yarn / fabric sensor arrays are difficult to achieve high-resolution sensing and face challenges such as difficulty in sensor data collection and integration. Therefore, it is a huge challenge to achieve a simpler and more efficient differentiated signal interaction interface for smart wearable devices through yarn structure regulation.

[0006] Chinese invention patent CN114739280A discloses a multi-element nano-carbon fiber yarn strain sensor and its preparation method. First, carbon black / carbon nanotubes / graphene are uniformly dispersed in a dimethylformamide / tetrahydrofuran mixed solvent, and then thermoplastic polyurethane particles are dissolved in the dispersion to prepare a spinning solution. A nanofiber bundle is formed by an electrostatic spinning method, and then it is twisted to obtain a conductive yarn composed of multi-element nano-carbon fibers. Finally, electrodes are prepared at both ends of the yarn with tin foil and conductive silver glue to obtain a multi-element nano-carbon fiber yarn strain sensor. The preparation method is simple and reasonable, and conductive nano-fiber yarn with weavability and washability can be prepared in large quantities. The yarn can be directly used as a strain sensor. The yarn sensor can be directly woven or sewn into clothing, sports equipment such as wrist guards and knee pads, and other objects on the human body, such as plasters attached to the human body, to detect human body movement and physiological information such as breathing and heartbeat. However, the wear resistance and dielectric sensing performance of the prepared multi-element nano-carbon fiber yarn strain sensor are poor, and the preparation process is complicated, and it cannot fully meet the material requirements of smart wearables.

[0007] Chinese invention patent CN109023614A discloses a flexible intelligent yarn sensor, including conductive yarn, yarn holding component, yarn twist number control mechanism and tension mechanism; the yarn holding component includes an insulating support rod, a hinge and a lower insulating support plate connected to the insulating support rod, 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 number control mechanism is connected to the rotating electrode clamp, driving the rotating electrode clamp to rotate to change the twist number of the conductive yarn; the tension mechanism includes a tension rod and a tension adjustment slider sleeved on the tension rod, the tension rod is connected to the fixed electrode clamp; the conductive yarn is placed between the fixed electrode clamp and the rotating electrode clamp. The invention utilizes the flexible characteristics of conductive fibers to adjust the resistance according to the change of the set number of twists of the conductive yarn. However, the dielectric sensing performance of the flexible intelligent yarn sensor is poor, the equipment is complex, and it is not conducive to use on existing industrial equipment.

[0008] Chinese invention patent CN108896199A discloses a stretchable yarn sensor and a preparation method thereof, which relates to the field of flexible sensor technology. The sensor includes an elastic yarn and an electrode yarn wound on the surface of the elastic yarn in an "S"-shaped spiral. The electrode yarn includes a sensitive fiber, an electrode wire connected to both ends of the sensitive fiber, and a packaging layer coated on the surface of the sensitive fiber and the electrode wire. The sensitive fiber includes a matrix fiber and a temperature-sensitive material or a humidity-sensitive material coated on the surface of the matrix fiber. The yarn sensor uses the electrode wire as an electrode and the packaging layer as a dielectric material to monitor temperature or humidity changes by changes in the resistance of the sensitive fiber. The invention also provides a preparation method for the yarn sensor. The prepared yarn sensor has good stability and high sensitivity, and all structures are flexible materials, which are thin and can be attached. It can fit comfortably on the surface of human skin to achieve the purpose of long-term and real-time monitoring. However, the electrode yarn of the yarn sensor is wound outside the yarn, which is extremely uncomfortable to wear, and the sensing effect is easily affected by the external environment. Summary of the invention

[0009] In response to the above problems, the present invention provides a friction spinning-based heterogeneous yarn and 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 a non-homogeneous yarn based on friction spinning is as follows:

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

[0013] The outer covering filament feeding assembly is arranged outside the friction roller and can move along the core filament direction. The feeding point of the outer covering 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 strands and wrapping them around the core filament.

[0015] The conductive filaments are at least one of silver-plated filaments, stainless steel, copper and aluminum wires.

[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 is in the range of 0.1 to 0.4 m.

[0018] The parameters of the friction spinning are: the friction roller speed is 3000-5000 r / min, the combing 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 assembly is 0.2-0.4 m, and the speed is 2-6 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 principle. The invention utilizes the fiber tension transfer theory to achieve an interlayer stitching and interlocking composite structure of conductive filaments and short fibers by applying periodic harmonic migration to the conductive filaments during the friction spinning process, thereby constructing a yarn with a heterogeneous structure. This structural design aims to improve the mechanical stability and wear resistance of the yarn, while at the same time achieving 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. 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 the present 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 prior art, 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 the short fibers form an interlayer stitching and interlocking 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-dimensional direction. 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 has good softness and thermal and moisture comfort while maintaining high durability and sensing performance, and is suitable for direct contact with the skin, thus meeting the dual requirements of comfort and functionality of smart wearable devices in practical applications. 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 This is a schematic diagram of the heterogeneous yarn structure and filament distribution according to Example 1 of the present invention;

[0029] Figure 3 is a geometric model of the inhomogeneous yarn structure described in Example 1 of the present invention;

[0030] Figure 4 The displacement S, speed 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;

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

[0032] Figure 6 Wear resistance test and microscopic magnification of the non-homogeneous 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 yarn cross section; (d) wear resistance test of non-homogeneous 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 zone; 7. Combing roller; 8. Feeding roller; 9. Drawing 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 ​​the present invention is to utilize 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 the conductive filaments and the 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-dimensional direction 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 a non-homogeneous yarn based on friction spinning is as follows:

[0042] Friction spinning is adopted, and the silver-plated filaments are used as the core filaments 2 and the outer filaments 1, respectively, and the cotton fiber whiskers are used as the short fiber whiskers 3; the core filaments 2 and the short fiber whiskers 3 are fed in a conventional friction spinning manner, the short fiber whiskers 3 first pass through the feeding roller 8, and then are stretched 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 the outer filament feeding component 4 applies periodic harmonic migration to the outer filaments 1, 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 stitching and interlocking composite yarns, and in the friction spinning process, the short fiber whiskers 3 and the outer filaments 1 are successively wound around the outside of the core filaments 2 to form an outer sheath of the core filament 2, and the outer sheath is an interlocking structure of cotton fibers and silver-plated filaments, so as to obtain 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: the speed of the friction roller 5 is 4000r / min, the speed of the combing roller 7 is 4000r / min, the feeding speed of the short fiber sliver 3 is 0.4m / min, the output speed is 18m / min, the curling speed is 18m / 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 0.3m, and the speed is 4m / min.

[0046] Example 2

[0047] A method for preparing a non-homogeneous yarn based on friction spinning is substantially the same as that of Example 1, 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 non-homogeneous yarn based on friction spinning is substantially the same as that of Example 1, 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 non-homogeneous yarn based on friction spinning is substantially the same as that of Example 1, 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 non-homogeneous yarn based on friction spinning is substantially the same as that of Example 1, 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 non-homogeneous yarn based on friction spinning is substantially the same as that of Example 1, 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 non-homogeneous yarn based on friction spinning is substantially the same as that of Example 1, 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 a friction spun core-spun yarn is as follows:

[0060] Friction spinning is adopted, two identical silver-plated filaments are used as core filaments 2, and cotton fiber whiskers are used as short fiber whiskers 3; the core filaments 2 and the short fiber whiskers 3 are fed in a conventional friction spinning method, 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 area 6 in a friction roller 5, and the short fiber whiskers 3 are successively wound around the outer side of the core filament 2 to form an outer sheath of the core filament 2, the outer sheath being cotton fiber, and a friction spinning core-spun yarn is obtained;

[0061] The friction spinning parameters are: the speed of the friction roller 5 is 4000r / min, the speed of the combing roller 7 is 4000r / min, the feeding speed of the short fiber sliver 3 is 0.4m / min, the output speed is 18m / min, the curling speed is 18m / 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, 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 the short fiber whiskers 3 are fed in a conventional friction spinning manner, the short fiber whiskers 3 first pass through a feeding roller 8, and then are stretched by a drafting roller 9, and then enter a combing roller 7 for combing, and enter a fiber coagulation area 6 in a friction roller 5, and the outer filament feeding assembly 4 is used to fix the outer filament 1 at the middle position of the periodic harmonic migration, and in 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 sheath of the core filament 2, and a friction spinning wrapped yarn is obtained;

[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 4000r / min, the speed of the combing roller 7 is 4000r / min, the feeding speed of the short fiber sliver 3 is 0.4m / min, the output speed is 18m / min, the curling speed is 18m / 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 test

[0069] The yarns prepared in this embodiment and the comparative example were tested for wear resistance. According to the Chinese FZ / T01058-1999 standard, the friction performance of different yarn samples was tested using a FFZ622 yarn wear tester. The yarns were straightened using a 30g weight, and rubbed with 600-mesh sandpaper until they broke using a reciprocating friction roller method; each yarn was tested 60 times, the number of friction breaks was recorded, and the average value was taken. 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] The pressure sensing data of different sites in the same harmonic cycle in the composite yarn are collected and fitted, and the difference in sensing performance of different sites in the one-dimensional direction of the yarn is analyzed. The influence of filament distribution on the sensing sensitivity, detection range, response time and cycle durability of the composite yarn is explored. The structure-activity relationship between various integrated design parameters and sensing performance is clarified, and feedback is provided to guide the integrated preparation of flexible intelligent wearable devices.

[0075] It is planned to verify the influence of heterogeneous structure on yarn sensing performance through the combination of finite element simulation analysis and 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 two filaments of the harmonic migration filament. When the yarn cross section is compressed, the area lw between the filaments remains unchanged, and the distance d decreases. The dielectric constant of the fiber composite material 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 abrasion resistance and dielectric sensing performance of the heterogeneous yarn prepared in Example 1 are the best.

[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, which may provide the best wrapping and interlocking effect for the yarn. 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 whiskers 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] Compared with Comparative Examples 1 and 2, the embodiment shows better wear resistance and dielectric sensing performance, 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), making 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 filaments are used as the core filaments (2) and the outer filaments (1), and the short fibers are used as the short fiber whiskers (3); the core filaments (2) and the short fiber whiskers (3) are fed in a conventional friction spinning method, and the short fiber whiskers (3) first pass through a feeding roller (8), and then pass through a drafting roller (9) for drafting, and then enter a combing roller (7) for combing, and enter a fiber coagulation area (6) in a friction roller (5), and pass through an outer filament feeding component (4) to the outer filament whiskers (3). 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 coagulation zone (6), thereby realizing the controllable construction of interlayer stitched and interlocked composite yarns. During 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 cladding of the core filament (2), wherein the outer cladding is an interlocked structure of the short fibers and the conductive filaments, thereby obtaining a heterogeneous yarn (10).

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 conductive filaments are at least one of silver-plated filaments, stainless steel, copper and aluminum wires.

5. 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.

6. The method for preparing heterogeneous yarn based on friction spinning according to claim 1, characterized in that: The width of the fiber coagulation zone (6) is in the range of 0.1 to 0.4 m.

7. The method for preparing heterogeneous yarn based on friction spinning according to claim 1, characterized in that: The parameters of the friction spinning are: the speed of the friction roller (5) is 3000-5000 r / min, the speed of the combing roller (7) is 3000-5000 r / min, the feeding speed of the short fiber strands (3) 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 filament (2) in the heterogeneous yarn is 5-20:

1.

8. The method for preparing heterogeneous yarn based on friction spinning according to claim 1, characterized in that: The periodic harmonic migration distance of the outer filament feeding component (4) is 0.2-0.4 m, and the speed is 2-6 m / min.

9. A non-homogeneous yarn based on friction spinning, characterized in that: Prepared by the preparation method according to any one of claims 1 to 8.

10. The use of the friction-spun heterogeneous yarn according to claim 9, characterized in that: For use in smart textiles and wearable devices.

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