Resistively stable stretchable conductive fibers and continuous process for their production

Abstract

The application discloses a kind of resistance stable stretchable conductive fiber and its continuous preparation method, comprising the following steps: S1, with elastic fiber as baseline, through feeding roller pay-off, after wetting, coating carbon nanotube, solvent bath, drying, through collection roller take-up;The linear velocity of collection roller is greater than the linear velocity of feeding roller;S2, the fiber obtained in the previous step is payed-off by feeding roller, after wetting, coating carbon nanotube, solvent bath, drying, through collection roller take-up;The linear velocity of feeding roller and collection roller is the same as step S1;S3, repeat step S2 to coat multiple layers of carbon nanotube, and obtain resistance stable stretchable conductive carbon fiber.The application uses elastic fiber as baseline, realizes the elongation of elastic fiber to preset multiple by the speed difference of feeding roller and collection roller, and obtains resistance stable stretchable conductive fiber by wetting and coating carbon nanotube multiple times, and the preparation method is simple, low in cost, and continuous production can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of conductive fibers, in particular to a stretchable conductive fiber with stable resistance and a continuous preparation method thereof. BACKGROUND

[0002] Stretchable conductive fibers are a kind of fibers with certain mechanical and electrical properties, and they can effectively solve the problem that deformation and stable conductivity cannot coexist in traditional rigid conductive wires, and have broad application prospects in the fields of intelligent textiles, wearable electronic devices, human motion detection, etc.

[0003] At present, there are mainly three methods for preparing stretchable conductive fibers: the first method is to disperse conductive materials in a polymer elastomer solution to prepare elastic conductive fibers by wet spinning. For example, in the document (Appl. Mater. Today, 2018, 11, 255), poly(3,4-ethylenedioxythiophene), polystyrene sulfonate and polyurethane solution are mixed to obtain a spinning solution, and then an elastic conductive yarn is prepared by wet spinning process. This method can realize the continuous preparation of stretchable conductive fibers, but the conductivity of the prepared fibers needs to be improved due to the limited addition of conductive components. The second method is to coat conductive materials on the outer layer of existing elastic fibers to give the elastic fibers certain conductivity. For example, patent CN114108152B discloses a preparation method of a multi-level structure composite yarn with strain sensing and stable tensile resistance, which uses spandex filament as core yarn, adds a conductive crimp layer (the conductive material is carbon nanotube or liquid metal), then performs surface coating by electrospinning, then covers carbon-based nanomaterials and metal nanomaterials, and finally covers a layer of electrospun fiber web to prepare a complete yarn. The multi-level structure disclosed in this patent can well avoid the problem of nanomaterials falling off, but the preparation method is complex, the materials used are more and the cost is higher. The third method is to first prepare a conductive fiber, and then wrap it around the surface of an elastic fiber filament to prepare an elastic conductive yarn. For example, patent CN110129942B discloses an elastic conductive yarn and a preparation method thereof, which first prepares a conductive core-spun yarn by ring spinning, then twists and wraps the elastic fiber filament with the obtained conductive core-spun yarn, and finally obtains an elastic conductive yarn. This preparation method is easy to realize large-scale production, but the preparation process is complex, and there is a problem of unstable resistance under large deformation.

[0004] Therefore, it is of great significance to develop a stretchable conductive fiber with stable resistance, which has a simple preparation method, can be continuously prepared and has low cost. SUMMARY

[0005] The present application aims at the deficiencies in the prior art, and provides a stretchable conductive fiber with stable resistance and a continuous preparation method thereof, so as to realize the elongation of elastic fibers to a preset multiple through the speed difference between feeding rollers and collecting rollers, and obtain the stretchable conductive fiber with stable resistance through multiple wetting and carbon nanotube coating, and the preparation method is simple, low in cost and capable of realizing continuous production.

[0006] In order to solve the above technical problems, the present application provides a continuous preparation method of a stretchable conductive fiber with stable resistance, comprising the following steps:

[0007] S1, taking elastic fibers as a baseline, feeding through feeding rollers, wetting, carbon nanotube coating, solvent bath, drying, winding through collecting rollers, releasing tension after winding, and retracting elastic fibers;

[0008] In the step, the linear speed of the collecting rollers is greater than that of the feeding rollers.

[0009] S2, feeding the fibers obtained in the above step through feeding rollers, wetting, carbon nanotube coating, solvent bath, drying, winding through collecting rollers, releasing tension after winding, and retracting elastic fibers;

[0010] In the step, the linear speed of the feeding rollers and the collecting rollers is the same as that in step S1.

[0011] S3, repeating step S2 to coat multiple layers of carbon nanotubes, and obtaining the stretchable conductive carbon fiber with stable resistance.

[0012] In the present application, the speed difference between the feeding rollers and the collecting rollers is used to elongate the elastic fibers to a preset multiple, the multiple of the fibers is maintained, the fibers are wetted multiple times and coated with carbon nanotubes, the stretching force is released after the coating of multiple layers of carbon nanotubes is completed, the fibers retract, the carbon nanotube layer is folded with the baseline, and the stretchable conductive fiber with stable resistance is obtained. When the fiber is applied again, the folded carbon nanotube layer is restructured in space with the stretching of the baseline, and the bonding force between the carbon nanotube layer and the baseline wetted by the polyurethane solution is strong, and there is no risk of falling off, so that the conductive performance of the fiber is stable. The diameter and resistance of the stretchable conductive fiber can be adjusted by adjusting the thickness of the baseline and the number of coatings. The preparation method is simple, low in cost and capable of realizing continuous production.

[0013] Further, the multiple of the pre-stretching is 1.5-4 times.

[0014] Further, in S1 and S2, the solution used for wetting is an aqueous polyurethane solution with a mass concentration of 5-10%, and the carbon nanotubes are coated after wetting by the aqueous polyurethane solution, the polyurethane plays a role of adhesion between the baseline and the carbon nanotube layer, improves the bonding force between the two, and reduces the risk of carbon nanotube falling off.

[0015] Further, the elastic fiber is a polyurethane fiber, and the fineness of the elastic fiber is 280-2280D.

[0016] Further, in S1 and S2, the coating specifically refers to contacting the wetted elastic fiber with the carbon nanotubes to coat a layer of carbon nanotubes on the surface of the elastic fiber.

[0017] Further, in S1 and S2, the carbon nanotubes are prepared by a floating catalyst chemical vapor deposition method.

[0018] Further, in S1 and S2, the solvent used in the solvent bath is water, ethanol or acetone.

[0019] Further, the number of repetitions is 0-4 times.

[0020] The second aspect of the application discloses the electrically resistive stable stretchable conductive fiber prepared by the preparation method of the first aspect.

[0021] Further, when the tensile deformation rate of the fiber is 50-300%, the resistance change rate is less than 15%.

[0022] The beneficial effects of the application are as follows:

[0023] The application uses an elastic fiber as a baseline, coats a carbon nanotube cylinder on the surface of the pre-stretched baseline, and releases the stretching force to obtain an electrically resistive stable stretchable conductive fiber, the preparation method is simple, the cost is low, and the method can be continuously performed, and is suitable for mass production.

[0024] The electrically resistive stable stretchable conductive fiber prepared by the method has good bonding force between the outer layer of carbon nanotubes and the inner layer of elastic fiber baseline, and there is no risk of falling off, and can realize stable conductive performance within a certain deformation range, and has good flexibility.

[0025] The application can adjust the diameter and resistance of the fiber by adjusting the thickness of the baseline and the number of coatings, so as to obtain stretchable conductive fibers with different sizes and resistances. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described in the following are only the embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0027] Figure 1 is the SEM image of the conductive fiber prepared in Example 1 of the present application;

[0028] Figure 2 is the SEM image of the conductive fiber prepared in Example 2 of the present application;

[0029] Figure 3 is the SEM image of the conductive fiber prepared in Example 3 of the present application;

[0030] Figure 4 is the resistance change graph of the conductive fiber prepared in Example 4 of the present application under different tensile deformations. DETAILED DESCRIPTION

[0031] The technical solutions of the present application will be described clearly and completely in the following by combining the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present application.

[0032] Example 1

[0033] The present embodiment relates to a continuous preparation method of stretchable conductive fiber with stable resistance, comprising the following steps:

[0034] (1) preparing carbon nanotube cylinders by using floating catalyst chemical vapor deposition method:

[0035] The mixture of catalyst precursor, growth promoter and carbon source is fed by peristaltic pump and carried into the reactor by carrier gas for reaction, to obtain carbon nanotube cylinders, wherein the catalyst precursor is ferrocene, the growth promoter is thiophene, and the carbon source is ethanol, the mass ratio of the three is 98.8:0.6:0.6, the reaction temperature is 1300℃, and the carrier gas is high-purity nitrogen;

[0036] (2) taking polyurethane fiber as the baseline (fineness is 560D), the polyurethane fiber is pre-stretched to 3 times of the original length by setting the linear speed of the feeding roller and the collecting roller, and then the following steps are performed: wetting, coating carbon nanotubes, solvent bath, drying, and then releasing the tension after the winding is finished, and the elastic fiber is retracted;

[0037] (3) The fiber obtained in the previous step is fed out through the feed roller, wetted, coated with carbon nanotubes, in a solvent bath, and dried, and then taken in through the collecting roller. After the take-up is completed, the tension is released and the elastic fiber retracts; wherein, the linear speed of the feed roller and the collecting roller is the same as in step (2).

[0038] (4) Repeat step (3) 3 times to obtain the resistance-stable stretchable conductive carbon fiber.

[0039] In steps (2) and (3), wetting is specifically achieved by adding a 5 wt.% aqueous polyurethane solution to wet the fiber; coating the carbon nanotubes is specifically achieved by contacting the wetted fiber with the carbon nanotube tubular material, thereby coating the fiber surface with the carbon nanotube tubular material; the solvent in the solvent bath is ethanol; and the drying conditions are drying at 80°C for 1 hour.

[0040] The scanning electron microscope image of the stretchable conductive fiber finally produced in this embodiment is shown below. Figure 1 As shown, the fiber surface is uniformly coated with carbon nanotubes, and the carbon nanotube layer is arranged in concentric rings around the baseline surface. This is because the carbon nanotubes are coated under pre-stretched conditions; after the tensile force is released, the fiber retracts, and the carbon nanotube layer wrinkles along with the baseline. Its linear resistivity is 47.5 ± 2.5 Ωcm. -1 During tensile deformation, the rate of change in resistance increases with the increase in deformation rate. When the tensile deformation rate is 200%, the rate of change in resistance of the stretchable conductive fiber is less than 12%.

[0041] Example 2

[0042] This embodiment relates to a continuous preparation method for a resistance-stable stretchable conductive fiber, comprising the following steps:

[0043] (1) Preparation of carbon nanotube tubular materials by floating catalyst chemical vapor deposition:

[0044] A mixture of catalyst precursor, growth promoter and carbon source is fed into a reactor via a peristaltic pump and carried by a carrier gas to obtain carbon nanotubes. The catalyst precursor is ferrocene, the growth promoter is thiophene, and the carbon source is ethanol. The mass ratio of the three is 98.8:0.6:0.6. The reaction temperature is 1300℃ and the carrier gas is high-purity nitrogen.

[0045] (2) Using polyurethane fiber as the baseline (fineness of 840D), the fiber is fed out through the feed roller, wetted, coated with carbon nanotubes, in a solvent bath, and dried, and then taken back through the collection roller. After the take-up is completed, the tension is released and the elastic fiber retracts. The linear speed of the feed roller and the collection roller is set to pre-stretch the polyurethane fiber to 4 times its original length.

[0046] (3) the fiber obtained in the previous step is unwound through a feeding roller, wetted, coated with carbon nanotubes, dried in a solvent bath, and then wound up through a collection roller, after which the tension is released and the elastic fiber retracts; the linear speed of the feeding roller and the collection roller is the same as in step (2);

[0047] (4) step (3) is repeated once to obtain the electrically resistive stable stretchable conductive carbon fiber;

[0048] In steps (2) and (3), the wetting is specifically achieved by adding a water-based polyurethane solution with a concentration of 7.5 wt.% to wet the fiber; the carbon nanotube coating is specifically achieved by contacting the wetted fiber with a carbon nanotube cylinder, thereby achieving the coating of the fiber surface with the carbon nanotube cylinder; the solvent of the solvent bath is ethanol; and the drying condition is 80°C for 1 h.

[0049] The scanning electron microscope image of the stretchable conductive fiber finally prepared in this example is shown in FIG. 1. Figure 2 The fiber obtained in Example 1 is similar, and the fiber surface is uniformly coated with a carbon nanotube layer. The linear resistance of the fiber is 60.0 ± 3.0 Ωcm -1 When the fiber is stretched, the resistance change rate increases with the increase of the deformation rate, and when the stretch deformation rate is 300%, the resistance change rate of the stretchable conductive fiber is less than 13%.

[0050] Example 3

[0051] This example relates to a continuous preparation method of an electrically resistive stable stretchable conductive fiber, comprising the following steps:

[0052] (1) carbon nanotube cylinders are prepared by a floating catalyst chemical vapor deposition method:

[0053] The mixture of catalyst precursor, growth promoter and carbon source is fed by a peristaltic pump and carried into the reactor by a carrier gas to react, thereby obtaining the carbon nanotube cylinder, wherein the catalyst precursor is ferrocene, the growth promoter is thiophene, and the carbon source is ethanol, the mass ratio of the three is 98.8:0.6:0.6, the reaction temperature is 1300°C, and the carrier gas is high-purity nitrogen;

[0054] (2) polyurethane fiber is used as the base line (fineness is 1120D), which is unwound through a feeding roller, wetted, coated with carbon nanotubes, dried in a solvent bath, and then wound up through a collection roller, after which the tension is released and the elastic fiber retracts; the linear speed of the feeding roller and the collection roller is set to pre-stretch the polyurethane fiber to 4 times the original length;

[0055] (3) the fiber obtained in the previous step is unwound through a feeding roller, wetted, coated with carbon nanotubes, dried in a solvent bath, and then wound up through a collection roller, after which the tension is released and the elastic fiber retracts; the linear speed of the feeding roller and the collection roller is the same as in step (2);

[0056] (4) step (3) is repeated once to obtain the stretchable conductive carbon fiber with stable resistance;

[0057] In steps (2) and (3), the wetting is specifically achieved by adding a water-based polyurethane solution with a concentration of 7.5 wt.% to wet the fiber; the carbon nanotube coating is specifically achieved by contacting the wetted fiber with a carbon nanotube cylinder, thereby achieving the coating of the fiber surface with the carbon nanotube cylinder; the solvent of the solvent bath is ethanol; and the drying condition is 80°C for 1 h.

[0058] The scanning electron microscope image of the stretchable conductive fiber finally prepared in this example is shown in FIG. 2. Figure 3 The linear resistance of the fiber is 98.0 ± 3.5 Ωcm -1 When the fiber is stretched, the resistance change rate increases with the increase of the deformation rate, and when the stretch deformation rate is 300%, the resistance change rate of the stretchable conductive fiber is less than 15%.

[0059] Example 4

[0060] This example relates to a continuous preparation method of a stretchable conductive fiber with stable resistance, comprising the following steps:

[0061] (1) carbon nanotube cylinders are prepared by a floating catalyst chemical vapor deposition method:

[0062] The mixture of catalyst precursor, growth promoter and carbon source is fed by a peristaltic pump and carried into the reactor by a carrier gas to react, thereby obtaining the carbon nanotube cylinder, wherein the catalyst precursor is ferrocene, the growth promoter is thiophene, and the carbon source is ethanol, the mass ratio of the three is 98.8:0.6:0.6, the reaction temperature is 1300°C, and the carrier gas is high-purity nitrogen;

[0063] (2) polyurethane fiber is used as the base line (fineness is 1120D), which is unwound through a feeding roller, wetted, coated with carbon nanotubes, dried in a solvent bath, and then wound up through a collection roller, after which the tension is released and the elastic fiber retracts; the linear speed of the feeding roller and the collection roller is set to pre-stretch the polyurethane fiber to 4 times the original length;

[0064] (3) the fiber obtained in the previous step is unwound by a feeding roller, wetted, coated with carbon nanotubes, dried in a solvent bath, and then wound by a collection roller, after which the tension is released and the elastic fiber retracts; wherein the linear speed of the feeding roller and the collection roller is the same as in step (2);

[0065] (4) step (3) is repeated 3 times to obtain the stretchable conductive carbon fiber with stable resistance;

[0066] In steps (2) and (3), the wetting is specifically achieved by adding a water-based polyurethane solution with a concentration of 7.5 wt.% to wet the fiber; the carbon nanotube coating is specifically achieved by contacting the wet fiber with a carbon nanotube cylinder, thereby coating the fiber surface with the carbon nanotube cylinder; the solvent of the solvent bath is ethanol; and the drying condition is 80°C for 1 h.

[0067] The linear resistance of the stretchable conductive fiber finally prepared in this example is 86.0 ± 2.5 Ωcm -1 When the stretch deformation rate increases, the resistance change rate increases, and when the stretch deformation rate is 300%, the resistance change rate of the stretchable conductive fiber is less than 14%, with reference to Figure 4 .

[0068] Example 5

[0069] This embodiment relates to a continuous preparation method of a stretchable conductive carbon fiber with stable resistance, comprising the following steps:

[0070] (1) carbon nanotube cylinders are prepared by a floating catalyst chemical vapor deposition method:

[0071] The mixture of catalyst precursor, growth promoter and carbon source is fed by a peristaltic pump and carried into the reactor by a carrier gas to react, thereby obtaining the carbon nanotube cylinder, wherein the catalyst precursor is ferrocene, the growth promoter is thiophene, and the carbon source is ethanol, and the mass ratio of the three is 98.8:0.6:0.6, the reaction temperature is 1300°C, and the carrier gas is high-purity nitrogen;

[0072] (2) polyurethane fiber is used as the baseline (fineness is 2280D), the fiber is unwound by a feeding roller, wetted, coated with carbon nanotubes, dried in a solvent bath, and then wound by a collection roller, after which the tension is released and the elastic fiber retracts; wherein the linear speed of the feeding roller and the collection roller is set to pre-stretch the polyurethane fiber to 3 times the original length;

[0073] (3) the fiber obtained in the previous step is unwound by a feeding roller, wetted, coated with carbon nanotubes, dried in a solvent bath, and then wound by a collection roller, after which the tension is released and the elastic fiber retracts; wherein the linear speed of the feeding roller and the collection roller is the same as in step (2);

[0074] (4) repeating step (3) 3 times to obtain the stretchable conductive carbon fiber with stable resistance;

[0075] In step (2) and step (3), the wetting is specifically achieved by wetting the fiber by dropping the aqueous polyurethane solution with a concentration of 10 wt.%; the wrapping of the carbon nanotube is specifically achieved by contacting the wetted fiber with the carbon nanotube cylinder, so that the fiber surface is coated with the carbon nanotube cylinder; the solvent of the solvent bath is ethanol; and the drying condition is 80℃ for 1h.

[0076] The linear resistance of the stretchable conductive fiber finally prepared in this example is 115.0±1.5Ωcm -1 When the fiber is stretched, the resistance change rate increases with the increase of the deformation rate, and when the stretch deformation rate is 200%, the resistance change rate of the stretchable conductive fiber is less than 15%.

[0077] Example 6

[0078] This embodiment relates to a continuous preparation method of a stretchable conductive fiber with stable resistance, comprising the following steps:

[0079] (1) preparing a carbon nanotube cylinder by a floating catalyst chemical vapor deposition method:

[0080] The mixture of the catalyst precursor, the growth promoter and the carbon source is fed by a peristaltic pump and carried into the reactor by a carrier gas to react, so as to obtain the carbon nanotube cylinder, wherein the catalyst precursor is ferrocene, the growth promoter is thiophene, and the carbon source is ethanol, the mass ratio of the three is 98.8:0.6:0.6, the reaction temperature is 1300℃, and the carrier gas is high-purity nitrogen;

[0081] (2) taking a polyurethane fiber as a baseline (with a fineness of 560D), unwinding the fiber through a feeding roller, wetting, coating the carbon nanotube, solvent bath, drying, and then winding the fiber through a collection roller, and releasing the tension after winding is completed, so that the elastic fiber retracts; wherein the linear speed of the feeding roller and the collection roller is set to pre-stretch the polyurethane fiber to twice the original length;

[0082] (3) unwinding the fiber obtained in the previous step through a feeding roller, wetting, coating the carbon nanotube, solvent bath, drying, and then winding the fiber through a collection roller, and releasing the tension after winding is completed, so that the elastic fiber retracts; wherein the linear speed of the feeding roller and the collection roller is the same as that in step (2);

[0083] (4) repeating step (3) 1 time to obtain the stretchable conductive carbon fiber with stable resistance;

[0084] In step (2) and step (3), the wetting is specifically achieved by wetting the fiber by dropping the aqueous polyurethane solution with a concentration of 5 wt.%; the wrapping of the carbon nanotube is specifically achieved by contacting the wetted fiber with the carbon nanotube cylinder, i.e. the fiber surface is coated with the carbon nanotube cylinder; the solvent of the solvent bath is ethanol; and the drying condition is 80℃ for 1h.

[0085] The linear resistance of the stretchable conductive fiber finally prepared in the example is 53.5±2Ωcm -1 When the fiber is stretched, the resistance change rate increases with the increase of the deformation rate, and when the stretch deformation rate is 100%, the resistance change rate of the stretchable conductive fiber is less than 12%.

[0086] In summary, the stretchable conductive fiber with stable resistance is prepared by coating the carbon nanotube cylinder on the surface of the pre-stretched baseline according to the present application, and the resistance change rate is less than 15% when the deformation of the conductive fiber is not more than the stretch elongation rate of the pre-stretching, and the preparation method is simple, low in cost and suitable for continuous production, and suitable for mass production; the stretchable conductive fiber with stable resistance prepared by the method of the present application has good bonding force between the outer carbon nanotube and the inner elastic fiber baseline, and there is no risk of falling off; the diameter and resistance of the fiber can be adjusted by adjusting the thickness of the baseline and the number of coatings, so that stretchable conductive fibers with different sizes and resistances can be obtained.

[0087] The present application has been described in detail with reference to specific embodiments and exemplary examples, but these descriptions are not to be construed as limiting the present application. Those skilled in the art understand that various equivalent substitutions, modifications or improvements can be made to the technical solutions and embodiments of the present application without departing from the spirit and scope of the present application, and these all fall within the scope of the present application. The scope of protection of the present application is subject to the appended claims.

Claims

1. A continuous preparation method for a resistance-stable stretchable conductive fiber, characterized in that, Includes the following steps: S1. Using elastic fiber as the baseline, the fiber is fed out through a feeding roller, wetted, coated with carbon nanotubes, in a solvent bath, and dried. Then, it is taken back through a collecting roller. After the take-up is completed, the tension is released and the elastic fiber retracts. The linear velocities of the feed roller and the collecting roller are set according to the pre-stretch ratio, wherein the linear velocity of the collecting roller is greater than that of the feed roller. S2. The fiber obtained in the previous step is fed out through the feeding roller, wetted, coated with carbon nanotubes, in a solvent bath, and dried. Then it is taken back through the collecting roller. After the take-up is completed, the tension is released and the elastic fiber retracts. The linear velocities of the feed roller and the collecting roller are the same as in step S1; S3. Repeat step S2 to coat multiple layers of carbon nanotubes to obtain the resistance-stable stretchable conductive carbon fiber. In S1 and S2, the wetting solution is an aqueous polyurethane solution with a mass concentration of 5%-10%.

2. The continuous preparation method of resistance-stable stretchable conductive fiber as described in claim 1, characterized in that, In S1, the pre-stretching ratio is 1.5-4 times.

3. The continuous preparation method of resistance-stable stretchable conductive fiber as described in claim 1, characterized in that, In S1, the elastic fiber is a polyurethane fiber, and the fineness of the elastic fiber is 280-2280 D.

4. The continuous preparation method of resistance-stable stretchable conductive fiber as described in claim 1, characterized in that, In S1 and S2, the coating specifically involves contacting the wetted elastic fiber with the carbon nanotube and coating its surface with a layer of carbon nanotubes.

5. The continuous preparation method of resistance-stable stretchable conductive fiber as described in claim 1, characterized in that, In S1 and S2, the carbon nanotubes are prepared by floating catalyst chemical vapor deposition.

6. The continuous preparation method of resistance-stable stretchable conductive fiber as described in claim 1, characterized in that, In S1 and S2, the solvent used in the solvent bath is water, ethanol, or acetone.

7. The continuous preparation method of resistance-stable stretchable conductive fiber as described in claim 1, characterized in that, In S3, the number of repetitions is 0-4 times.

8. A resistance-stable stretchable conductive fiber prepared by the preparation method according to any one of claims 1-7.

9. The resistance-stable stretchable conductive fiber as described in claim 8, characterized in that, When the tensile deformation rate of the fiber is 50%-300%, the resistivity change rate is less than 15%.

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