High-elasticity sensing core yarn and preparation method thereof

Abstract

The invention discloses a high-elasticity sensing core yarn and a preparation method thereof, and belongs to the technical field of intelligent textile preparation, and the preparation method comprises the following steps: step S1, placing composite elastic fibers in a conductive nano dispersion liquid for dipping treatment to obtain modified conductive fibers; s2, modified conductive fibers are added into the polyurethane solution, after dipping treatment is conducted for 30-50 min, drying is conducted under the condition of 60 DEG C, opening, carding and twisting are conducted, and the high-elasticity sensing core yarn is obtained. According to the invention, by introducing the modified carbon nanotube dispersion liquid with good dispersibility, the agglomeration phenomenon of the modified carbon nanotubes during impregnation of the composite elastic fiber is effectively avoided, the elastic core yarn is endowed with good sensing performance, and meanwhile, the internal molecular structure of the composite elastic fiber contains polyaniline with good electrochemical performance, so that the composite elastic fiber has good electrochemical performance. And an internal and external conductive path is formed in the elastic core yarn, so that the sensing performance of the elastic core yarn is further enhanced.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent textile preparation, and specifically relates to a high-elasticity sensing core yarn and a preparation method thereof. Background Art

[0002] High-elasticity sensing core yarn is a yarn composed of a high-elastic polymer as a base and a conductive filler. Its main use is as the core sensing element of smart textiles for real-time monitoring of human physiological parameters such as heart rate, blood oxygen saturation, respiratory rate, etc. It is widely used in medical health, sports and fitness, smart home and other fields.

[0003] In the existing technology, carbon nanotubes are usually added as sensing fillers when preparing high-elasticity sensing core yarns. Carbon nanotubes have good electrical conductivity and can give the yarn excellent sensing properties. However, the surface of carbon nanotubes lacks active functional groups and has poor dispersion properties. They are easily agglomerated in solvents, which limits their application in core yarn sensing. Therefore, how to improve the dispersion properties of carbon nanotubes without destroying their conductive properties is a technical problem that needs to be solved at present. Summary of the Invention

[0004] The object of the present invention is to provide a high-elasticity sensing core yarn and a preparation method thereof, so as to solve the problems in the background technology.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A method for preparing a high-elasticity sensing core yarn comprises the following steps:

[0007] Step S1: Preparation of conductive fibers:

[0008] Adding composite elastic fibers to the modified carbon nanotube dispersion, subjecting the fibers to ultrasonic reaction at room temperature for 10-15 minutes, removing the fibers from the dispersion after drying, placing the fibers in a silver nanowire dispersion, continuing the ultrasonic reaction for 10-15 minutes, removing the fibers from the dispersion after drying, and obtaining modified conductive fibers.

[0009] Step S2: Synthesis of high-elasticity sensing core yarn:

[0010] The modified conductive fiber is added into the polyurethane solution, impregnated for 30-50 minutes, dried at 60°C, and then opened, combed and twisted to obtain a high-elasticity sensing core yarn.

[0011] Furthermore, in step S1, the usage ratio of the modified carbon nanotube dispersion, the composite elastic fiber, and the silver nanowire dispersion is 80 mL:15-20 g:60 mL; the concentration of the silver nanowire dispersion is 0.9-1.3 wt %; in step S2, the usage ratio of the polyurethane solution and the modified conductive fiber is 80 mL:10-12 g; the concentration of the polyurethane solution is 0.4-0.6 wt %.

[0012] Furthermore, the modified carbon nanotube dispersion is obtained by dispersing multi-walled carbon nanotubes, sericin and dodecylbenzenesulfonic acid in deionized water and then ultrasonicating for 40 minutes;

[0013] Among them, sericin is used as a surface modifier. With the assistance of the small molecule surfactant dodecylbenzenesulfonic acid, the aromatic groups in the sericin are bonded to the multi-walled carbon nanotubes through π-π non-covalent bonds, thereby obtaining modified carbon nanotubes with sericin modified surfaces. Compared with the covalent modification of multi-walled carbon nanotubes by grafting active functional groups on the surface of multi-walled carbon nanotubes, non-covalent modification can not only improve the dispersibility of multi-walled carbon nanotubes, but also will not destroy the crystal structure of multi-walled carbon nanotubes, thereby not reducing the conductive properties of multi-walled carbon nanotubes.

[0014] Furthermore, the usage ratio of the multi-walled carbon nanoparticles, sericin, dodecylbenzenesulfonic acid and deionized water is 3-5 g: 0.6-1 g: 0.02-0.1 g: 100 mL.

[0015] Furthermore, the composite elastic fiber is prepared by the following steps:

[0016] A1. Add citric acid and ammonium persulfate to deionized water, disperse them ultrasonically, then add dichloromethane and the bio-based elastomer, stir and mix at 1-5°C, then add aniline solution, continue stirring and react for 3-4 hours, filter, wash, and dry to obtain a conductive elastomer.

[0017] A2. Mixing the vacuum-dried spandex resin and the conductive elastomer in a mixer, and then melt-spinning the fibers. After pulling and winding, composite elastic fibers are obtained.

[0018] Among them, ammonium persulfate is used as an initiator and citric acid is used as a cross-linking agent. In situ emulsion polymerization is adopted to synthesize polyaniline on the molecular chain of bio-based elastomer. Polyaniline has special electrochemical properties. After doping, a conductive elastomer is obtained, which is then combined with spandex resin through covalent bonds to obtain a composite elastic fiber with intrinsic conductive properties.

[0019] Composite elastic fiber of the present invention

[0020] Furthermore, in step A1, the usage ratio of deionized water, citric acid, ammonium persulfate, dichloromethane, bio-based elastomer, and aniline solution is 50 mL: 6.2-8.1 g: 3.6-4.3 g: 40 mL: 5-7 g: 50 mL; and in step A2, the mass ratio of spandex resin to conductive elastomer is 30-50: 6-9.

[0021] Furthermore, the aniline solution is prepared by dispersing aniline in a polyvinyl pyrrolidone solution with a concentration of 13.6-14.5 wt%;

[0022] Among them, the volume ratio of aniline to polyvinyl pyrrolidone solution is 3-4:60; polyvinyl pyrrolidone is a polymer surfactant, and its aqueous solution has good dispersibility and stability, which can not only improve the dispersibility of aniline in deionized water, but also prevent aniline from premature polymerization during the preparation of conductive elastomer.

[0023] Furthermore, the bio-based elastomer is prepared by the following steps:

[0024] Under an argon atmosphere, hydroxy-terminated polybutadiene is added to toluene, and the mixture is stirred and mixed. 4,4'-diphenylmethane diisocyanate and dibutyltin dilaurate are added, and the mixture is reacted at 40-45°C for 4-5 hours. The mixture is then heated to 80-90°C and the reaction is continued for 6-7 hours. Lactide and stannous octoate are then added, mixed evenly, and the mixture is reacted at 100-110°C for 10-12 hours. The mixture is then placed in excess anhydrous ethanol for precipitation, and finally filtered, washed, and dried to obtain a bio-based elastomer.

[0025] Among them, terminal hydroxyl polybutadiene is used as a prepolymer, 4,4'-diphenylmethane diisocyanate is used as a chain extender, and dibutyltin dilaurate is used as a catalyst. A macromolecular soft segment containing terminal hydroxyl groups is obtained through a coupling reaction. The macromolecular soft segment is used as an initiator. Under the catalysis of stannous octoate, the terminal hydroxyl groups and lactide undergo ring-opening polymerization to obtain a block-type bio-based elastomer with polylactic acid as a hard segment.

[0026] Furthermore, the usage ratio of toluene, hydroxy-terminated polybutadiene, 4,4'-diphenylmethane diisocyanate, dibutyltin dilaurate, lactide and stannous octoate is 100 mL: 14.1-20.6 mL: 1.2-1.6 g: 0.1-0.3 mL: 16-24 g: 0.01-0.03 mL.

[0027] A high-elasticity sensing core yarn is prepared by the above preparation method.

[0028] Beneficial effects of the present invention:

[0029] The composite elastic fiber of the present invention contains active groups such as amino and isocyanate groups on its surface. When immersed in a modified carbon nanotube dispersion, the modified carbon nanotubes contain sericin on their surface, which can exert the bioadhesive properties of sericin, attaching the modified carbon nanotubes to the surface of the composite elastic fiber. Stable chemical bonds are formed through the hydroxyl and isocyanate groups, thereby enhancing the intermolecular forces between the composite elastic fiber and the modified carbon nanotubes. At the same time, the silver nanowires can be adsorbed on the surface of the modified carbon nanotubes through electrostatic action, and cooperate with them to construct a dense three-dimensional conductive network on the surface of the modified conductive fiber, thus giving the core yarn excellent conductive sensing properties. In addition, the polyurethane coating treatment of the modified conductive fiber can effectively prevent the oxidation of the silver nanowires on the surface of the sensing core yarn, thereby improving the stability of the conductive network. It can also act as an "adhesive" to enhance the interfacial bonding between the conductive layer and the fiber surface, effectively preventing the conductive layer from falling off, and further improving the conductive sensing properties of the sensing core yarn.

[0030] The present invention introduces a modified carbon nanotube dispersion with good dispersibility, effectively avoiding the agglomeration of the modified carbon nanotubes when the composite elastic fiber is impregnated, and making the modified carbon nanotubes evenly and firmly bonded to the surface of the composite elastic fiber, giving the elastic core yarn good sensing performance. At the same time, the internal molecular structure of the composite elastic fiber of the present invention contains polyaniline with good electrochemical properties, which synergizes with the three-dimensional conductive layer of the modified carbon nanotubes and silver nanowires to form internal and external conductive paths in the elastic core yarn, further enhancing the sensing performance of the elastic core yarn. DETAILED DESCRIPTION

[0031] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] Example 1

[0033] This embodiment provides a bio-based elastomer, which is prepared by the following steps:

[0034] Under an argon atmosphere, 14.1 mL of hydroxy-terminated polybutadiene was added to 100 mL of toluene and stirred. 1.2 g of 4,4'-diphenylmethane diisocyanate and 0.1 mL of dibutyltin dilaurate were added, and the mixture was reacted at 40°C for 4 hours. The temperature was then raised to 80°C and the reaction was continued for 6 hours. 16 g of lactide and 0.01 mL of stannous octoate were then added, mixed evenly, and reacted at 100°C for 10 hours. The mixture was then placed in excess anhydrous ethanol for precipitation. Finally, the bio-based elastomer was obtained after filtration, washing, and drying.

[0035] Example 2

[0036] This embodiment provides a bio-based elastomer, which is prepared by the following steps:

[0037] Under an argon atmosphere, 16.3 mL of hydroxy-terminated polybutadiene was added to 100 mL of toluene and stirred. 1.4 g of 4,4'-diphenylmethane diisocyanate and 0.2 mL of dibutyltin dilaurate were added and reacted at 43°C for 4.5 h. The temperature was then raised to 85°C and the reaction was continued for 6.5 h. 20 g of lactide and 0.02 mL of stannous octoate were then added and mixed evenly. The mixture was reacted at 105°C for 11 h. The mixture was then placed in excess anhydrous ethanol for precipitation. Finally, the bio-based elastomer was obtained after filtration, washing, and drying.

[0038] Example 3

[0039] This embodiment provides a bio-based elastomer, which is prepared by the following steps:

[0040] Under an argon atmosphere, 20.6 mL of hydroxy-terminated polybutadiene was added to 100 mL of toluene and stirred. 1.6 g of 4,4'-diphenylmethane diisocyanate and 0.3 mL of dibutyltin dilaurate were added and reacted at 45°C for 5 h. The temperature was then raised to 90°C and the reaction was continued for 7 h. 24 g of lactide and 0.03 mL of stannous octoate were then added and mixed evenly. The mixture was reacted at 110°C for 12 h. The mixture was then placed in excess anhydrous ethanol for precipitation. Finally, the bio-based elastomer was obtained after filtration, washing, and drying.

[0041] Example 4

[0042] This embodiment provides a composite elastic fiber, which is prepared by the following steps:

[0043] A1. Add 3 mL of aniline to 60 mL of a 13.6 wt% polyvinylpyrrolidone solution, mix well, and obtain an aniline solution.

[0044] A2. Add 6.2 g of citric acid and 3.6 g of ammonium persulfate to 50 mL of deionized water, and after ultrasonic dispersion, add 40 mL of dichloromethane and 5 g of the bio-based elastomer prepared in Example 1, and stir and mix at 1°C. Then add 50 mL of aniline solution, continue stirring and reacting for 3 h, and then filter, wash, and dry to obtain a conductive elastomer.

[0045] A3. 30 g of vacuum-dried spandex resin and 6 g of conductive elastomer were placed in a mixer and mixed evenly, and then melt-spun. After drawing and winding, a composite elastic fiber was obtained.

[0046] Example 5

[0047] This embodiment provides a composite elastic fiber, which is prepared by the following steps:

[0048] A1. Add 3.5 mL of aniline to 60 mL of a 14.1 wt% polyvinylpyrrolidone solution, mix well, and obtain an aniline solution.

[0049] A2. Add 7.2 g of citric acid and 3.9 g of ammonium persulfate to 50 mL of deionized water, and after ultrasonic dispersion, add 40 mL of dichloromethane and 6 g of the bio-based elastomer prepared in Example 2, and stir and mix at 3°C. Then add 50 mL of aniline solution, continue stirring and react for 3.5 hours, and then filter, wash, and dry to obtain a conductive elastomer.

[0050] A3. 40 g of vacuum-dried spandex resin and 7 g of conductive elastomer were placed in a mixer and mixed evenly, and then melt-spun. After pulling and winding, a composite elastic fiber was obtained.

[0051] Example 6

[0052] This embodiment provides a composite elastic fiber, which is prepared by the following steps:

[0053] A1. Add 4 mL of aniline to 60 mL of a 14.5 wt% polyvinylpyrrolidone solution, mix well, and obtain an aniline solution.

[0054] A2. Add 8.1 g of citric acid and 4.3 g of ammonium persulfate to 50 mL of deionized water, and after ultrasonic dispersion, add 40 mL of dichloromethane and 7 g of the bio-based elastomer prepared in Example 3, and stir and mix at 5°C. Then add 50 mL of aniline solution, continue stirring and reacting for 4 hours, and then filter, wash, and dry to obtain a conductive elastomer.

[0055] A3. 50 g of vacuum-dried spandex resin and 9 g of conductive elastomer were placed in a mixer and mixed evenly, and then melt-spun. After pulling and winding, composite elastic fibers were obtained.

[0056] Comparative Example 1: Compared with Example 5, the difference is that the spandex resin is directly melt-spun with the bio-based elastomer, and the other raw materials and steps are the same.

[0057] Comparative Example 2: Compared with Example 5, the difference is that the spandex resin is directly melt-spun with the commercially available styrene elastomer, and the other raw materials and steps are the same.

[0058] Example 7

[0059] This embodiment provides a method for preparing a high-elasticity sensing core yarn, comprising the following steps:

[0060] Step S1: Preparation of modified carbon nanotube dispersion:

[0061] 0.02 g of dodecylbenzenesulfonic acid was added to 100 mL of deionized water, and the mixture was stirred. 3 g of multi-walled carbon nanotubes and 0.6 g of sericin were added, and the carbon nanotube dispersion was modified after ultrasonic treatment for 40 min.

[0062] Step S2: Preparation of conductive fibers:

[0063] 15 g of the composite elastic fiber prepared in Example 4 was added to 80 mL of the modified carbon nanotube dispersion, and ultrasonically reacted at room temperature for 10 min. After being removed and dried, the composite elastic fiber was placed in 60 mL of a 0.9 wt % silver nanowire dispersion and ultrasonically reacted for another 10 min. The composite elastic fiber was removed and dried to obtain a modified conductive fiber.

[0064] Step S3: Synthesis of high-elasticity sensing core yarn:

[0065] 10 g of modified conductive fiber was added to 80 mL of 0.4 wt% polyurethane solution, and the mixture was immersed for 30 min and then dried at 60° C. The yarn was then opened, combed, and twisted to obtain a highly elastic sensing core yarn.

[0066] Example 8

[0067] This embodiment provides a method for preparing a high-elasticity sensing core yarn, comprising the following steps:

[0068] Step S1: Preparation of modified carbon nanotube dispersion:

[0069] 0.06 g of dodecylbenzenesulfonic acid was added to 100 mL of deionized water, stirred and mixed, and 4 g of multi-walled carbon nanotubes and 0.8 g of sericin were added. After ultrasonication for 40 min, the carbon nanotube dispersion was modified.

[0070] Step S2: Preparation of conductive fibers:

[0071] 18 g of the composite elastic fiber prepared in Example 5 was added to 80 mL of the modified carbon nanotube dispersion, and ultrasonically reacted at room temperature for 12 minutes. After being removed and dried, the composite elastic fiber was placed in 60 mL of a 1.1 wt% silver nanowire dispersion and ultrasonically reacted for another 12 minutes. The composite elastic fiber was removed and dried to obtain a modified conductive fiber.

[0072] Step S3: Synthesis of high-elasticity sensing core yarn:

[0073] 11 g of modified conductive fiber was added to 80 mL of 0.5 wt% polyurethane solution, and the mixture was immersed in water for 40 min and then dried at 60° C. The yarn was then opened, combed, and twisted to obtain a highly elastic sensing core yarn.

[0074] Example 9

[0075] This embodiment provides a method for preparing a high-elasticity sensing core yarn, comprising the following steps:

[0076] Step S1: Preparation of modified carbon nanotube dispersion:

[0077] 0.1 g of dodecylbenzenesulfonic acid was added to 100 mL of deionized water, stirred and mixed, and 5 g of multi-walled carbon nanotubes and 1 g of sericin were added. After ultrasonication for 40 min, the carbon nanotube dispersion was modified.

[0078] Step S2: Preparation of conductive fibers:

[0079] 20 g of the composite elastic fiber prepared in Example 6 was added to 80 mL of the modified carbon nanotube dispersion, and ultrasonically reacted at room temperature for 15 minutes. After being removed and dried, the composite elastic fiber was placed in 60 mL of a 1.3 wt% silver nanowire dispersion and ultrasonically reacted for another 15 minutes. The composite elastic fiber was removed and dried to obtain a modified conductive fiber.

[0080] Step S3: Synthesis of high-elasticity sensing core yarn:

[0081] 12 g of modified conductive fiber was added to 80 mL of 0.6 wt% polyurethane solution, and the mixture was immersed in the solution for 50 min, dried at 60° C., and then opened, combed, and twisted to obtain a highly elastic sensing core yarn.

[0082] Comparative Example 3: Compared with Example 7, the difference is that the composite elastic fiber prepared in Comparative Example 1 is used, and the other raw materials and steps are the same.

[0083] Comparative Example 4: Compared with Example 7, the difference is that the composite elastic fiber prepared in Comparative Example 2 is used, and the other raw materials and steps are the same.

[0084] Comparative Example 5: Compared with Example 7, the difference is that the modified carbon nanotube dispersion is replaced by the carbon nanotube dispersion in an equal amount, and the other raw materials and steps are the same.

[0085] Performance tests were conducted on Examples 7-9 and Comparative Examples 3-5. Stress sensing performance was tested by connecting a strain control device (electronic universal testing machine) and an electrical signal acquisition device (high-precision digital multimeter) to the same computer. The resistance at a strain range of 150-240 wt% was recorded, and the sensitivity at this time was calculated. Elasticity testing was performed by measuring the elongation at break of the samples in accordance with FZ / T 50006-2013. The results are shown in Table 1.

[0086] Table 1

[0087]

[0088] As can be seen from Table 1, the resistance of the high-elasticity sensing core yarn prepared by modified carbon nanotube dispersion and composite elastic fiber in Examples 7-9 is significantly lower than that of Comparative Examples 3-5, and the sensitivity is higher than that of Comparative Examples 3-5, with good sensing performance. At the same time, the elongation at break can reach up to 763%, and it has high elasticity; in addition, compared with Comparative Examples 4 and 5, Example 7 has higher sensitivity and elongation at break, indicating that the high-elasticity sensing core yarn prepared by the modified carbon nanotube dispersion and composite elastic fiber has better elasticity and sensing properties.

[0089] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0090] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a high elastic sensing core yarn, characterized in that: The following steps are involved: Step S1, preparation of conductive fibers: Adding composite elastic fiber to the modified carbon nanotube dispersion, subjecting it to ultrasonic reaction for 10-15 minutes at room temperature, taking it out and drying it, placing it in the silver nanowire dispersion, continuing the ultrasonic reaction for 10-15 minutes, taking it out and drying it, to obtain the modified conductive fiber; Step S2: Synthesis of high elastic sensing core yarn: The modified conductive fiber is added into the polyurethane solution, impregnated for 30-50 minutes, dried at 60°C, and then opened, combed and twisted to obtain a high-elasticity sensing core yarn.

2. The method for preparing a high elastic sensing core yarn according to claim 1, characterized in that: In step S1, the usage ratio of the modified carbon nanotube dispersion, the composite elastic fiber, and the silver nanowire dispersion is 80mL:15-20g:60mL; the concentration of the silver nanowire dispersion is 0.9-1.3wt%; in step S2, the usage ratio of the polyurethane solution and the modified conductive fiber is 80mL:10-12g; the concentration of the polyurethane solution is 0.4-0.6wt%.

3. The method for preparing a high elastic sensing core yarn according to claim 1, characterized in that: The modified carbon nanotube dispersion is prepared by dispersing multi-walled carbon nanotubes, sericin and dodecylbenzene sulfonic acid in deionized water and then ultrasonicating the water for 40 minutes.

4. The method for preparing a high elastic sensing core yarn according to claim 3, characterized in that: The usage ratio of the multi-walled carbon nanoparticles, sericin, dodecylbenzene sulfonic acid and deionized water is 3-5 g: 0.6-1 g: 0.02-0.1 g: 100 mL.

5. The method for preparing a high elastic sensing core yarn according to claim 1, characterized in that: The composite elastic fiber is prepared by the following steps: A1. Add citric acid and ammonium persulfate to deionized water, and after ultrasonic dispersion, add dichloromethane and bio-based elastomer, stir and mix at 1-5°C, then add aniline solution, continue stirring and reacting for 3-4h, and then filter, wash and dry to obtain a conductive elastomer; A2. The vacuum-dried spandex resin and the conductive elastomer are placed in a mixer and mixed evenly, and then melt-spun. After pulling and winding, a composite elastic fiber is obtained.

6. The method for preparing a high elastic sensing core yarn according to claim 5, characterized in that: In step A1, the dosage ratio of deionized water, citric acid, ammonium persulfate, dichloromethane, bio-based elastomer, and aniline solution is 50 mL: 6.2-8.1 g: 3.6-4.3 g: 40 mL: 5-7 g: 50 mL; and in step A2, the mass ratio of spandex resin to conductive elastomer is 30-50: 6-9.

7. The method for preparing a high elastic sensing core yarn according to claim 5, characterized in that: The aniline solution is prepared by dispersing aniline in a polyvinyl pyrrolidone solution with a concentration of 13.6-14.5wt%; the volume ratio of the aniline to the polyvinyl pyrrolidone solution is 3-4:

60.

8. The method for preparing a high elastic sensing core yarn according to claim 5, characterized in that: The bio-based elastomer is prepared by the following steps: Add terminal hydroxyl polybutadiene to toluene under an argon atmosphere, stir and mix, add 4,4'-diphenylmethane diisocyanate and dibutyltin dilaurate, react at 40-45°C for 4-5h, then heat to 80-90°C and continue to react for 6-7h, then add lactide and stannous octoate, mix well, react at 100-110°C for 10-12h, then place in excess anhydrous ethanol for precipitation, and finally filter, wash and dry to obtain a bio-based elastomer.

9. The method for preparing a high elastic sensing core yarn according to claim 8, characterized in that: The dosage ratio of toluene, hydroxyl-terminated polybutadiene, 4,4'-diphenylmethane diisocyanate, dibutyltin dilaurate, lactide and stannous octoate is 100mL: 14.1-20.6mL: 1.2-1.6g: 0.1-0.3mL: 16-24g: 0.01-0.03mL.

10. A high elastic sensing core yarn, characterized in that: Prepared according to the preparation method according to any one of claims 1 to 9.

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