A stretchable electrically conductive core-sheath composite yarn insensitive to resistance strain and a drafting differential method for preparing the same and applications thereof

Abstract

The application provides a stretchable conductive core-sheath composite yarn insensitive to resistance strain and a drafting differential method for preparing and applying the same, and relates to the technical field of conductive materials.The stretchable conductive core-sheath composite yarn insensitive to resistance strain comprises an elastic sheath and a conductive core wire.The elastic sheath is an elastic polymer film layer.The conductive core wire is one of a silver-plated conductive yarn, a stainless steel conductive yarn, a graphene conductive yarn and a carbon black conductive yarn.The conductive core wire is spirally distributed.The stretchable conductive core-sheath composite yarn provided by the application is low in cost, excellent in strain insensitivity, stretchable, high in conductivity, environment-friendly and externally insulated.

Description

Technical Field

[0001] This invention relates to the field of conductive materials technology, specifically to a stretchable conductive core-sheath composite yarn that is insensitive to resistance and strain, its preparation method using a differential drafting method, and its application. Background Technology

[0002] With the rise and continuous development of smart electronic textiles and stretchable devices, there is an urgent need to develop and research conductive materials with stretchability, high conductivity, and resistance strain insensitivity. Common resistance strain-insensitive conductive materials are prepared by forming specific structures, using specific materials, or combining materials and structures. Common research methods include forming spiral, serpentine, and wrinkled structures to construct strain-insensitive conductive materials, or using liquid metals, conductive polymers, and metal nanoparticles to prepare strain-insensitive materials. However, some common research methods are relatively complex and costly. Furthermore, some strain-insensitive conductive materials have exposed conductive materials, which may leak, pollute the environment, and pose a risk of short circuits.

[0003] To solve the above problems, liquid metal is usually placed in a silicone tube. Thanks to the good properties of liquid metal itself and the protection of liquid metal by the silicone tube, strain insensitivity, environmental friendliness and electrical insulation are achieved. However, liquid metal is expensive. Summary of the Invention

[0004] The purpose of this invention is to provide a stretchable conductive core-sheath composite yarn that is insensitive to resistance and strain, as well as its preparation method and application using a differential drafting method. The stretchable conductive core-sheath composite yarn provided by this invention has low cost, excellent strain insensitivity, stretchability, high conductivity, environmental friendliness, and external electrical insulation.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] This invention provides a stretchable conductive core-sheath composite yarn that is insensitive to resistance strain, comprising an elastic sheath and a conductive core; the elastic sheath is an elastic polymer film layer; the conductive core is one of silver-plated conductive yarn, stainless steel conductive yarn, graphene conductive yarn, and carbon black conductive yarn; the conductive core is distributed in a spiral shape.

[0007] Preferably, the diameter of the conductive core wire is 0.1 to 1.5 mm; the pitch of the conductive core wire is 0.2 to 5 mm.

[0008] Preferably, the conductive material content in the conductive core wire is 0.1 to 30 wt%.

[0009] This invention provides a method for preparing the stretchable conductive core-sheath composite yarn described above using a differential drafting method, comprising the following steps:

[0010] A conductive yarn coated with a layering release agent is injected into an elastic polymer spinning tube through a spinning tube. Subsequently, the conductive yarn and the elastic polymer spinning solution pass together through a composite spinning tube into a coagulation bath. The elastic polymer spinning solution coagulates to form an elastic polymer sheath, resulting in a conductive sheath-core composite yarn. The conductive sheath-core composite yarn includes an elastic polymer sheath and a conductive yarn core. A layering release agent is filled between the elastic polymer sheath and the conductive yarn core.

[0011] The conductive core-sheath composite yarn is introduced into the drafting zone and passes through the first drafting roller and the second drafting roller in sequence. It is subjected to the drafting differential speed to obtain a stretchable conductive core-sheath composite yarn; the speed of the second drafting roller is higher than the speed of the first drafting roller.

[0012] Preferably, the delamination agent comprises one or more of distilled water, N,N-dimethylformamide, and ethanol; the conductive yarn wrapped with the delamination agent is injected in a direction perpendicular to the direction through which the elastic polymer spinning solution passes.

[0013] Preferably, the propulsion speed of the elastic polymer spinning solution is 10-50 mL / h; the injection speed of the conductive yarn coated with the layered peeling agent is 10-40 mL / h.

[0014] Preferably, the linear velocity ratio between the second drafting roller and the first drafting roller is 1 to 10:1.

[0015] Preferably, the speed of the first drafting roller is 2 to 10 mm / s; the speed of the second drafting roller is 10 to 50 mm / s.

[0016] Preferably, the concentration of the elastic polymer spinning solution is 10–70 wt%.

[0017] This invention provides the application of the stretchable conductive core-sheath composite yarn described in the above technical solution or the stretchable conductive core-sheath composite yarn prepared by the preparation method described in the above technical solution in stretchable materials.

[0018] This invention provides a stretchable conductive core-sheath composite yarn that is insensitive to resistance and strain, comprising an elastic sheath and a conductive core. The elastic sheath is an elastic polymer film layer; the conductive core is one of silver-plated conductive yarn, stainless steel conductive yarn, graphene conductive yarn, and carbon black conductive yarn; the conductive core is spirally distributed. In this invention, the conductive core has good conductivity, thus the core layer of this invention has good conductivity; the sheath, made of an elastic polymer, has good stretchability, and the conductive core in the core layer of this invention is spirally shaped. During stretching, the spiral conductive core is gradually stretched and straightened, and upon recovery, it returns to its spiral shape due to the resilience of the elastic polymer in the sheath, further improving the stretchability of the core-sheath composite yarn. On the one hand, this invention forms a spiral conductive core in the core layer, which is macroscopically elongated during stretching, while the microscopic stress is minimal. On the other hand, the conductive core itself has stable conductivity. Therefore, the core-sheath composite yarn provided by this invention exhibits extremely small resistance change rate and excellent strain insensitivity when stretched and bent. The results of the embodiments show that the resistance change rate of the stretchable conductive core-sheath composite yarn provided by the present invention does not exceed 0.2% under tensile strain.

[0019] This invention is environmentally friendly and green. Due to the presence of the elastic polymer in the outer layer and the stability of the conductive core wire itself, there is no risk of conductive material leakage.

[0020] The presence of the elastic polymer in the outer layer of this invention provides electrical insulation, preventing short circuits between circuits during use. Example results show that the stretchable conductive core-sheath composite yarn provided by this invention still functions normally when placed underwater and when the stretchable conductive core-sheath composite yarn connected to the positive and negative terminals of a power source is twisted together, proving that the elastic polymer in the outer layer of this invention has an insulating effect.

[0021] This invention provides a method for preparing the stretchable conductive core-sheath composite yarn described above using a differential drafting speed method. In this invention, conductive yarn coated with a layered peeling agent is injected into an elastic polymer spinning solution. After passing through a coagulation bath, the elastic polymer spinning solution solidifies to form an elastic polymer sheath that does not adhere to the conductive yarn. When the obtained conductive core-sheath composite yarn passes through a first drafting roller and a second drafting roller sequentially, the elastic polymer is stretched due to the speed ratio between the second and first drafting rollers, while the conductive yarn, lacking elasticity, cannot be stretched. Therefore, the conductive yarn is rapidly pulled out at a speed faster than the elastic polymer, stretching the elastic polymer while keeping the conductive yarn straight. After the conductive core-sheath composite yarn passes through the second drafting roller, the elastic polymer in the sheath recovers, forming an elastic sheath, while the conductive yarn in the core layer is forced into a spiral, forming a conductive core. Finally, a core-sheath composite yarn with a spiral conductive core is obtained.

[0022] This invention improves the coaxial wet spinning process, enabling the conductive yarn to be propelled into the elastic polymer spinning solution along with the layering stripping agent. This avoids the conductive yarn and elastic polymer adhering together and thus preventing the formation of a helical structure. Based on wet spinning, this invention achieves continuous production.

[0023] In a specific embodiment of the present invention, silver-plated conductive yarn, which is generally not stretchable, has many limitations when applied to stretchable materials. However, the present invention utilizes the stretchability of PU, pre-stretches PU by using the speed ratio of the second stretching roller and the first stretching roller, and constructs the silver-plated conductive yarn in the core layer into a spiral shape, so that the silver-plated conductive yarn, which is not originally stretchable, can be better applied to stretchable materials. Attached Figure Description

[0024] Figure 1 A cross-sectional view along the fiber length of the resistance strain-insensitive stretchable conductive core-sheath composite yarn provided by the present invention. Figure 1 In this context, 1 represents the cortex and 2 represents the core.

[0025] Figure 2 The flowchart illustrates the preparation of a stretchable conductive core-sheath composite yarn that is insensitive to resistance strain, as an example. Detailed Implementation

[0026] This invention provides a stretchable conductive core-sheath composite yarn that is insensitive to resistance strain, comprising an elastic sheath and a conductive core; the elastic sheath is an elastic polymer film layer; the conductive core is one of silver-plated conductive yarn, stainless steel conductive yarn, graphene conductive yarn, and carbon black conductive yarn; the conductive core is distributed in a spiral shape.

[0027] In a specific embodiment of the present invention, the structural schematic diagram of the resistance strain-insensitive stretchable conductive core-sheath composite yarn is shown below. Figure 1 As shown, it includes a polyurethane outer layer 1 and a silver-plated conductive yarn core layer 2; the silver-plated conductive yarn 2 is spiral in shape.

[0028] The stretchable conductive core-sheath composite yarn provided by this invention includes an elastic sheath layer. In this invention, the elastic sheath layer is an elastic polymer film layer. Preferably, the raw material for the elastic polymer film layer includes one of polyurethane, polyvinylidene fluoride, styrene-butadiene-styrene block copolymer, and polyvinyl chloride.

[0029] The stretchable conductive core-sheath composite yarn provided by this invention includes a conductive core wire. In this invention, the conductive core wire is one of silver-plated conductive yarn, stainless steel conductive yarn, graphene conductive yarn, and carbon black conductive yarn; the conductive core wire is spirally distributed. In this invention, the diameter of the conductive core wire is preferably 0.1–1.5 mm; the pitch of the conductive core wire is preferably 0.2–5 mm, more preferably 0.5–2 mm. In this invention, the smaller the pitch, the better the stretchability. In this invention, the stretchability of the stretchable conductive core-sheath composite yarn is preferably 0–275%, more preferably 60–275%, and even more preferably 170–275%.

[0030] In this invention, the content of conductive material in the conductive core wire is preferably 0.1 to 30 wt%.

[0031] In this invention, the silver-plated conductive yarn is made by twisting silver-plated filaments, and has the characteristics of fineness, high conductivity, and non-stretchability. In a specific embodiment of this invention, the silver-plated conductive yarn is a commercially available product.

[0032] In this invention, the ΔR / R (resistance change rate) of the stretchable conductive core-sheath composite yarn is preferably <0.2, more preferably 0.05-0.15; the elongation at break is preferably 100-500%, more preferably 170-275%; and the resistance per unit length is preferably 0.1-100 Ω / cm, more preferably 12-18 Ω / cm. The stretchable conductive core-sheath composite yarn provided by this invention has the advantages of excellent strain insensitivity, stretchability, and high conductivity.

[0033] This invention provides a method for preparing the stretchable conductive core-sheath composite yarn described above using a differential drafting method, comprising the following steps:

[0034] A conductive yarn coated with a layering release agent is injected into an elastic polymer spinning tube through a spinning tube. Subsequently, the conductive yarn and the elastic polymer spinning solution pass together through a composite spinning tube into a coagulation bath. The elastic polymer spinning solution coagulates to form an elastic polymer sheath, resulting in a conductive sheath-core composite yarn. The conductive sheath-core composite yarn includes an elastic polymer sheath and a conductive yarn core. A layering release agent is filled between the elastic polymer sheath and the conductive yarn core.

[0035] The conductive core-sheath composite yarn is introduced into the drafting zone and passes through the first drafting roller and the second drafting roller in sequence. It is subjected to the drafting differential speed to obtain a stretchable conductive core-sheath composite yarn; the speed of the second drafting roller is higher than the speed of the first drafting roller.

[0036] This invention involves injecting conductive yarn coated with a layering release agent into an elastic polymer spinning tube via a spinning tube. The conductive yarn and the elastic polymer spinning solution then pass together through a composite spinning tube into a coagulation bath, where the elastic polymer spinning solution coagulates to form an elastic polymer sheath, resulting in a conductive core-sheath composite yarn. In this invention, the layering release agent preferably includes one or more of distilled water, N,N-dimethylformamide, and ethanol. In this invention, the conductive yarn is one of silver-plated conductive yarn, stainless steel conductive yarn, graphene conductive yarn, and carbon black conductive yarn. In this invention, the method for preparing the conductive yarn coated with the layering release agent preferably includes: inserting the conductive yarn through a needle C into a core layer needle B; the core layer needle B is connected to a needle tube containing the layering release agent. In this invention, the needle C preferably inserts perpendicularly into the core layer needle B. This invention involves vertically inserting conductive yarn into the delamination release agent. The advantage is that the conductive yarn enters the delamination release agent under maximum tension, which helps to adsorb more delamination release agent onto its surface, facilitating the separation of the conductive yarn from the elastic polymer film layer during subsequent differential drafting. In a specific embodiment of this invention, the specification of needle C is preferably 20-23G; the specification of needle B is preferably 20-23G.

[0037] In this invention, the conductive yarn wrapped in the layering release agent is injected perpendicular to the direction through which the elastic polymer spinning solution passes. This vertical approach allows the conductive yarn wrapped in the layering release agent to enter the elastic polymer spinning solution at maximum tension, which helps form a core-sheath structure at the center of the spinning solution, providing conditions for forming a round and uniform elastic skin layer. In a specific embodiment of this invention, the needle A used in the elastic polymer spinning solution is preferably 14-16G.

[0038] In this invention, the concentration of the elastic polymer spinning solution is preferably 10-70 wt%, more preferably 45 wt%. In this invention, the solvent of the elastic polymer spinning solution is preferably an organic solvent, more preferably including N,N-dimethylformamide, dimethyl sulfoxide, methyl ethyl ketone, or tetrahydrofuran.

[0039] In this invention, the propulsion speed of the elastic polymer spinning solution is preferably 10-50 mL / h, more preferably 40 mL / h; the injection speed of the conductive yarn coated with the layered peeling agent is preferably 10-40 mL / h, more preferably 30 mL / h.

[0040] In this invention, the coagulation bath is preferably water, more preferably deionized water. In this invention, the temperature of the coagulation bath is preferably -5 to 100°C, more preferably 10 to 60°C.

[0041] In this invention, the conductive core-sheath composite yarn comprises an elastic polymer sheath and a conductive yarn core; a delamination release agent is filled between the elastic polymer sheath and the conductive yarn core.

[0042] After obtaining the conductive core-sheath composite yarn, this invention introduces the yarn into the drafting zone, where it passes sequentially through a first drafting roller and a second drafting roller, undergoing a differential drafting speed to obtain a stretchable conductive core-sheath composite yarn. The speed of the second drafting roller is higher than that of the first drafting roller. In this invention, the linear speed ratio of the second drafting roller to the first drafting roller is preferably 1 to 10:1, more preferably 1 to 5:1. By adjusting the speed ratio of the second drafting roller to the first drafting roller, this invention achieves different pre-stretching ratios of the elastic sheath and adjustment of the conductive core yarn pitch, thereby obtaining core-sheath composite yarns with different stretching ratios.

[0043] In this invention, the speed of the first drafting roller is preferably 2 to 10 mm / s, more preferably 5 mm / s; the speed of the second drafting roller is preferably 10 to 50 mm / s, more preferably 16 to 24 mm / s.

[0044] Preferably, after passing through the second drafting roller, the resulting fibers are placed in a coagulation bath to obtain a stretchable conductive core-sheath composite yarn. In this invention, the coagulation bath is preferably water, more preferably deionized water.

[0045] This invention provides the application of the stretchable conductive core-sheath composite yarn described in the above-described technical solutions, or the stretchable conductive core-sheath composite yarn prepared by the above-described preparation method, in stretchable materials. In this invention, the stretchable material preferably includes data transmission conductors, electrical conductors, or fabrics.

[0046] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0047] Example 1

[0048] The flowchart for preparing the resistance strain-insensitive stretchable conductive core-sheath composite yarn in this embodiment is as follows: Figure 2 As shown.

[0049] (1) Preparation of improved coaxial needles:

[0050] Needle selection, such as Figure 2As shown, the needle A used in the cortex is 14G; the needle B used in the core layer is 20G; the needle C used to insert and guide the silver-plated conductive yarn to the core layer is 20G; and the length of needle B is longer than the length of needle A.

[0051] Press needles A, B, and C together Figure 2 Assembly, that is, needle B passes through the plastic part of needle A, and then bends at 90° to be in the center of needle A, initially assembling into a coaxial needle. At this time, needle A and needle B are perpendicular to each other. Then, needle C is inserted vertically into the plastic part of needle B, and needle C is perpendicular to needle A and needle B.

[0052] Method for inserting silver-plated conductive yarn: First, after assembling needle A and needle B, connect needle B to the syringe. Insert a short section of the silver-plated conductive yarn into needle B and immerse it in water. Pull the syringe, using the resulting negative pressure to force the yarn through needle B. Make a small hole in the plastic part of needle B and hook out the silver-plated conductive yarn. Use the syringe suction method to pass the yarn through needle C, then assemble needle C perpendicular to needle A and needle B onto needle B. Finally, wind the silver-plated conductive yarn extracted from needle C onto the syringe to a certain length.

[0053] (2) Spinning process:

[0054] Step 1, Placement and Connection: Arrange the required experimental supplies according to... Figure 2 The setup involves connecting needle A to a syringe containing PU spinning solution and needle B to a syringe containing deionized water. Silver-plated conductive yarn (0.3mm in diameter, 15wt% silver content) is routed around an iron frame for easy yarn feeding. Needles A, B, and C are placed in a water tank filled with deionized water as a coagulation bath, with needles A and B parallel to the water surface and needle C perpendicular to the water surface, its upper end protruding above the water. Two sets of drafting rollers follow, and a beaker filled with deionized water is placed under the second set of drafting rollers to hold the resulting core-sheath composite yarn with a spiral core.

[0055] The second step involves setting the parameters: the solid content of the PU spinning solution is 45wt%; V1 is the speed at which the PU spinning solution is propelled in the outer layer, set to 40mL / h; V2 is the speed at which the deionized water is propelled in the core layer, set to 30mL / h; the silver-plated conductive yarn is drafted by rollers; V3 is the drafting speed of the first set of rollers, set to 5mm / s; V4 is the drafting speed of the second set of rollers, set to 16mm / s.

[0056] The third step is to begin spinning: manually guide the core-sheath composite yarn through the water tank. At this point, as... Figure 2As shown, the fiber sheath is made of PU, and the core layer is a silver-plated conductive yarn (straight) wrapped and protected by deionized water. The PU sheath is cured under the action of deionized water inside and outside, and does not stick to the silver-plated conductive yarn. After the fiber passes through the water tank, the sheath-core composite yarn is passed around two sets of drawing rollers in sequence to obtain a stretchable conductive sheath-core composite yarn with a core layer spiral structure that is not sensitive to resistance strain. The yarn is then collected in a beaker filled with deionized water.

[0057] A schematic diagram of the resistance strain-insensitive stretchable conductive core-sheath composite yarn prepared in this embodiment is shown below. Figure 1 As shown, it consists of a polyurethane outer layer 1 and a silver-plated conductive yarn core layer 2; the silver-plated conductive yarn 2 is spiral in shape with a pitch of 0.5 mm.

[0058] The resistance strain-insensitive stretchable conductive core-sheath composite yarn prepared in this embodiment has a breaking elongation of 170%, a resistance change rate ΔR / R of 0.05, and a resistance per unit length of 18Ω / cm.

[0059] Example 2

[0060] The preparation method is basically the same as that in Example 1, except that the speed of V3 is adjusted to 5 mm / s and the speed of V4 is adjusted to 22 mm / s.

[0061] A schematic diagram of the resistance strain-insensitive stretchable conductive core-sheath composite yarn prepared in this embodiment is shown below. Figure 1 As shown, it consists of a polyurethane outer layer 1 and a silver-plated conductive yarn core layer 2; the silver-plated conductive yarn 2 is spiral in shape with a pitch of 2 mm.

[0062] The resistance strain-insensitive stretchable conductive core-sheath composite yarn prepared in this embodiment has a breaking elongation of 225%, a resistance change rate ΔR / R of 0.1, and a resistance per unit length of 15Ω / cm.

[0063] Example 3

[0064] The preparation method is basically the same as that in Example 1, except that the speed of V3 is adjusted to 5 mm / s and the speed of V4 is adjusted to 24 mm / s.

[0065] A schematic diagram of the resistance strain-insensitive stretchable conductive core-sheath composite yarn prepared in this embodiment is shown below. Figure 1 As shown, it consists of a polyurethane outer layer 1 and a silver-plated conductive yarn core layer 2; the silver-plated conductive yarn 2 is spiral in shape with a pitch of 5 mm.

[0066] The resistance strain-insensitive stretchable conductive core-sheath composite yarn prepared in this embodiment has a breaking elongation of 275%, a resistance change rate ΔR / R of 0.15, and a resistance per unit length of 12Ω / cm.

[0067] The results of the examples show that, under the same conditions, the greater the speed difference between the second drafting roller and the first drafting roller, the greater the stretch ratio of the resulting fiber. By adjusting the speed difference between the second drafting roller and the first drafting roller, core-sheath composite yarns with different stretch ratios can be obtained.

[0068] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A stretchable conductive core-sheath composite yarn that is insensitive to resistance strain, comprising an elastic sheath and a conductive core; wherein the elastic sheath is an elastic polymer film layer; the conductive core is one of silver-plated conductive yarn, stainless steel conductive yarn, graphene conductive yarn, and carbon black conductive yarn; and the conductive core is distributed in a spiral shape. The method for preparing the stretchable conductive core-sheath composite yarn by differential drafting includes the following steps: A conductive yarn coated with a layering release agent is injected into an elastic polymer spinning tube through a spinning tube. Subsequently, the conductive yarn and the elastic polymer spinning solution pass together through a composite spinning tube into a coagulation bath. The elastic polymer spinning solution coagulates to form an elastic polymer sheath, resulting in a conductive sheath-core composite yarn. The conductive sheath-core composite yarn includes an elastic polymer sheath and a conductive yarn core. A layering release agent is filled between the elastic polymer sheath and the conductive yarn core. The conductive core-sheath composite yarn is introduced into the drafting zone and passes through the first drafting roller and the second drafting roller in sequence. It is subjected to the drafting differential speed to obtain a stretchable conductive core-sheath composite yarn. The speed of the second drafting roller is higher than that of the first drafting roller. The linear speed ratio of the second drafting roller to the first drafting roller is 1~10:

1.

2. The stretchable conductive core-sheath composite yarn according to claim 1, characterized in that, The diameter of the conductive core wire is 0.1~1.5mm; the pitch of the conductive core wire is 0.2~5mm.

3. The stretchable conductive core-sheath composite yarn according to claim 1 or 2, characterized in that, The conductive core wire contains 0.1 to 30 wt% conductive material.

4. The method for preparing the stretchable conductive core-sheath composite yarn according to any one of claims 1 to 3 by differential drafting, comprising the following steps: A conductive yarn coated with a layering release agent is injected into an elastic polymer spinning tube through a spinning tube. Subsequently, the conductive yarn and the elastic polymer spinning solution pass together through a composite spinning tube into a coagulation bath. The elastic polymer spinning solution coagulates to form an elastic polymer sheath, resulting in a conductive sheath-core composite yarn. The conductive sheath-core composite yarn includes an elastic polymer sheath and a conductive yarn core. A layering release agent is filled between the elastic polymer sheath and the conductive yarn core. The conductive core-sheath composite yarn is introduced into the drafting zone and passes through the first drafting roller and the second drafting roller in sequence. It is subjected to the drafting differential speed to obtain a stretchable conductive core-sheath composite yarn. The speed of the second drafting roller is higher than that of the first drafting roller. The linear speed ratio of the second drafting roller to the first drafting roller is 1~10:

1.

5. The preparation method according to claim 4, characterized in that, The delamination agent comprises one or more of distilled water, N,N-dimethylformamide, and ethanol; the conductive yarn wrapped with the delamination agent is injected in a direction perpendicular to the direction through which the elastic polymer spinning solution passes.

6. The preparation method according to claim 5, characterized in that, The propulsion speed of the elastic polymer spinning solution is 10~50mL / h; the injection speed of the conductive yarn coated with the layered peeling agent is 10~40mL / h.

7. The preparation method according to claim 4, characterized in that, The speed of the first drafting roller is 2~10 mm / s; the speed of the second drafting roller is 10~50 mm / s.

8. The preparation method according to claim 4, characterized in that, The concentration of the elastic polymer spinning solution is 10~70wt%.

9. The application of the stretchable conductive core-sheath composite yarn according to any one of claims 1 to 3 or the stretchable conductive core-sheath composite yarn prepared by the preparation method according to any one of claims 4 to 8 in stretchable materials.

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