A super-stretchable double-network composite conductive hydrogel and its preparation method

Abstract

The present invention provides a super-stretchable double-network composite conductive hydrogel and a preparation method thereof. The method comprises dissolving LiCl in a polyvinyl alcohol aqueous solution to obtain a mixed solution; uniformly dispersing a DMSO aqueous solution and a PEDOT:PSS aqueous solution to obtain a PEDOT:PSS mixed solution; then uniformly dispersing the PEDOT:PSS mixed solution and the mixed solution to obtain a mixed system A; adding graphene oxide to acrylic acid and uniformly dispersing the mixture; then adding ammonium persulfate and mixing the mixture to obtain a mixed system B; uniformly dispersing the mixed systems A and B, then vacuum defoaming and performing a cross-linking reaction, and finally freezing and thawing to obtain a super-stretchable double-network composite conductive hydrogel. The composite conductive hydrogel has both high conductivity and super-stretchability, can be used as a stretchable conductor, and has broad application prospects in the field of flexible sensing.

Description

Technical Field

[0001] The present invention belongs to the field of flexible electronics and sensing materials, and particularly relates to an ultra-stretchable double-network composite conductive hydrogel and a preparation method thereof. Background Art

[0002] In recent years, with the rapid development of flexible wearable devices, electronic skin and other fields, conductive hydrogels have been widely used in flexible electronics, artificial skin, flexible energy storage devices and other fields due to their flexible mechanical properties, good biocompatibility, adjustable conductive sensing channels and excellent multidimensional structure.

[0003] Hydrogel formation can generally be categorized as physical or chemical crosslinking. Chemically crosslinked hydrogels primarily utilize strong covalent bonds for crosslinking. However, since covalent interactions are too stable to be broken or reorganized under mild conditions, this makes it difficult to recover once bonds are broken during deformation. Hydrogels physically crosslinked via hydrogen bonds can address the irreversibility of chemical crosslinking by enabling reversible crosslinking between molecular chains. However, the mechanical properties of a crosslinked network composed of single hydrogen bonds are poor. Therefore, constructing multiple hydrogen bond crosslinks is considered a promising approach for developing hydrogels with high mechanical strength.

[0004] The conductive polymer poly (3,4-ethylenedioxythiophene):polystyrene sulfonate) (PEDOT:PSS) has good stability and dispersibility at lower temperatures due to the use of hydrophilic PSS as a dispersant. However, it easily aggregates at room temperature and is only soluble in a very small number of solvents, which to some extent affects the mechanical properties and conductivity of the hydrogel.

[0005] Therefore, how to prepare conductive hydrogels with both excellent electrical properties and mechanical flexibility remains a difficult problem. Summary of the Invention

[0006] In response to the problems existing in the prior art, the present invention provides an ultra-stretchable dual-network composite conductive hydrogel and a preparation method thereof, which has both high conductivity and ultra-stretchability, can be used as a stretchable conductor, and has broad application prospects in the field of flexible sensing.

[0007] The present invention is achieved through the following technical solutions:

[0008] A method for preparing an ultra-stretchable dual-network composite conductive hydrogel comprises the following steps:

[0009] S1, dissolving LiCl in a polyvinyl alcohol aqueous solution, with a mass ratio of LiCl to polyvinyl alcohol being (0.5-1):2, to obtain a mixed solution;

[0010] S2, uniformly dispersing the DMSO aqueous solution and the PEDOT:PSS aqueous solution to obtain a PEDOT:PSS mixed solution, wherein the mass ratio of DMSO to PEDOT:PSS is 5:(3-3.8), and then uniformly dispersing the PEDOT:PSS mixed solution and the mixed solution at a mass ratio of 3:(24.25-24.5) to obtain a mixed system A;

[0011] Graphene oxide was added to acrylic acid and dispersed evenly, and then ammonium persulfate was added and mixed evenly. The mass ratio of graphene oxide, acrylic acid and ammonium persulfate (0.1-0.2):9:0.045 was obtained to obtain a mixed system B.

[0012] S3, the mixed system A and the mixed system B are evenly dispersed according to the mass ratio of (25.25~27.5):(9.145~9.245), and then vacuum defoamed and cross-linked, and finally frozen and thawed to obtain an ultra-stretchable double-network composite conductive hydrogel.

[0013] Preferably, the molecular weight of the polyvinyl alcohol in S1 is 205,000, and the polyvinyl alcohol is stirred in deionized water at 70 to 80° C. for 1 to 1.5 hours to obtain a polyvinyl alcohol solution.

[0014] Preferably, in S2, the DMSO aqueous solution and the PEDOT:PSS aqueous solution are first stirred for 10 to 15 minutes, and then ultrasonically dispersed for 15 to 30 minutes at an ultrasonic power of 700 to 900 W to obtain a PEDOT:PSS mixed solution.

[0015] Furthermore, the solid content of the PEDOT:PSS aqueous solution is 1.5-1.9%, the conductivity is 600-700 S / cm, and the mass percentage concentration of the DMSO aqueous solution is 5%.

[0016] Preferably, after adding the PEDOT:PSS mixed solution to the mixed solution, the S2 is stirred for 5 to 10 minutes, and then ultrasonically dispersed for 15 to 30 minutes at an ultrasonic power of 700 to 900 W to obtain a mixed solution A.

[0017] Preferably, in S2, graphene oxide is added to acrylic acid and stirred evenly, and then ammonium persulfate is added after ultrasonic dispersion and stirred for 10 to 15 minutes to obtain a mixed system B.

[0018] Preferably, in S3, the mixed system A and the mixed system B are mixed and stirred for 5 to 10 minutes, and then ultrasonically dispersed at 0 to 5° C., and finally vacuum defoamed at a pressure of -0.15 to -0.1 MPa for 20 to 30 minutes.

[0019] Preferably, the cross-linking reaction in S3 is carried out at 60-70° C. for 4-5 hours.

[0020] Preferably, the S3 is first frozen at -15 to -10°C and then thawed at room temperature, and the operation is repeated 3 to 4 times to obtain an ultra-stretchable double-network composite conductive hydrogel.

[0021] A super-stretchable double-network composite conductive hydrogel is obtained by using any one of the above methods for preparing a super-stretchable double-network composite conductive hydrogel.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] The present invention discloses an ultra-stretchable double-network composite conductive hydrogel, which uses PVA (polyvinyl alcohol) and AA (acrylic acid) as matrix materials, PEDOT:PSS and LiCl as conductive fillers, and constructs a double hydrogen bond network skeleton by introducing polyvinyl alcohol and acrylic acid monomers, thereby greatly improving the mechanical properties of the hydrogel. At the same time, the introduction of metal salt LiCl cooperates with the salting-out effect to further improve the mechanical strength while the ions provide conductivity. The one-pot preparation method is adopted, and the process is simple and easy to operate. PEDOT:PSS is hydrogen-bonded and cross-linked in the hydrogel, so that the hydrogel has a certain self-repairing ability. The addition of DMSO is beneficial to improving the conductivity of PEDOT:PSS, and can change the connection mode of PEDOT and PSS and the interaction force between them, thereby obtaining a more complete conductive path. Vacuum defoaming can avoid the appearance of bubbles inside the hydrogel during the subsequent gelation process, thereby affecting the overall mechanical properties. It is also beneficial to the uniform dispersion of the conductive polymer, and the conductive path is more complete. Graphene oxide can act as a reinforcing agent and dispersant, which is beneficial to the dispersion of PEDOT:PSS in the gel skeleton and can improve the overall mechanical properties of the composite hydrogel. The present invention constructs a double-network gel skeleton through non-covalent cross-linking of hydrogen bonds, introduces graphene oxide, PEDOT:PSS and lithium chloride (LiCl) to form an ion / electronic dual conductive network, and prepares a flexible conductive hydrogel with both high conductivity and ultra-stretchability through freezing and thawing treatment. It can be used as a stretchable conductor and has broad application prospects in the field of flexible sensing.

[0024] Furthermore, the high-polymerization degree PVA with a molecular weight of 205,000 has a high viscosity when dissolved in water, which is beneficial to improving the strength and solvent resistance of the composite conductive hydrogel.

[0025] The composite conductive hydrogel of the present invention has good ductile mechanical properties and electrical conductivity, and can be used as a flexible conductor to replace some traditional metal wires. It also has excellent sensing properties and can be used for the personalized preparation of flexible sensor materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1a Schematic diagram of the formation mechanism of the composite conductive hydrogel of the present invention;

[0027] Figure 1b yes Figure 1a Magnified image of .

[0028] Figure 2 This is a physical picture of the composite conductive hydrogel precursor obtained in Example 1 of the present invention;

[0029] Figure 3 This is a physical picture of the composite conductive hydrogel obtained in Example 1 of the present invention after stretching;

[0030] Figure 4 This is a photo of the composite conductive hydrogel obtained in Example 1 of the present invention being used as a conductor and connected to a light bulb;

[0031] Figure 5 1 is the maximum stress-strain curve of the composite conductive hydrogel prepared in Examples 1 to 3 of the present invention;

[0032] Figure 6 The conductivity test of the composite conductive hydrogel prepared in Examples 1 to 3 of the present invention;

[0033] Figure 7 This is a curve diagram showing the response sensitivity of the composite conductive hydrogel prepared in Example 3 of the present invention to a strain signal when used as a strain sensor. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, which are intended to explain the present invention rather than to limit it.

[0035] The present invention is a method for preparing an ultra-stretchable double-network composite conductive hydrogel, which specifically comprises the following steps:

[0036] Step 1: Measure 1 g of polyvinyl alcohol (PVA) with a molecular weight of 205,000 and 23 g of deionized water, where the mass ratio of PVA to deionized water is 1:23, and stir and dissolve them in a constant temperature water bath at 70 to 80° C. for 1 to 1.5 hours to obtain a PVA solution;

[0037] Step 2, weighing 0.25 g to 0.5 g of LiCl and dissolving it in a PVA solution at room temperature, wherein the mass ratio of LiCl to PVA in the mixed solution is (0.5 to 1):2;

[0038] Step 3: Weigh 1 g of a DMSO aqueous solution (hereinafter referred to as DMSO) and 2 g of a PEDOT:PSS aqueous solution (hereinafter referred to as PEDOT:PSS), where the mass ratio of DMSO to PEDOT:PSS is 1:2, mix and stir for 10 to 15 minutes, and then ultrasonically disperse for 15 to 30 minutes at an ultrasonic power of 700 to 900 W to obtain a PEDOT:PSS mixed solution;

[0039] Product Name Solid content (%) Conductivity (S / cm) OE-000 Extra Espresso 1.5～1.9 600～700

[0040] The mass percentage concentration of DMSO is 5wt%;

[0041] Step 4: Add 1 to 3 g of the PEDOT:PSS mixed solution obtained in step 3 to the mixture in step 2, stir for 5 to 10 minutes, and then ultrasonically disperse for 15 to 30 minutes at an ultrasonic power of 700 to 900 W to obtain a mixed solution A.

[0042] Step 5: 9 g of acrylic acid, 0.045 g of ammonium persulfate, and 0.1-0.2 g of graphene oxide are measured, where the mass ratio of acrylic acid to ammonium persulfate is 1:0.005;

[0043] Step 6: adding 0.1-0.2 g of graphene oxide to acrylic acid and stirring evenly; adding ammonium persulfate after ultrasonic dispersion; and stirring with a glass rod for 10-15 minutes to obtain a mixed solution B;

[0044] Step 7, the mixed solution A obtained in step 4 and the mixed solution B obtained in step 6 are mixed uniformly (generally stirred for 5 to 10 minutes), then ultrasonically dispersed at 0 to 5° C. (generally 15 to 30 minutes), and vacuum defoamed at a pressure of -0.15 to -0.1 MPa for 20 to 30 minutes to obtain a PEDOT:PSS composite hydrogel precursor solution;

[0045] Step 8: Transfer the precursor solution to a mold and place it at 60-70°C for a cross-linking reaction for 4-5 hours. Then, freeze it at -15--10°C and thaw it at room temperature, which usually takes half an hour. This freeze-thaw operation is repeated three to four times to obtain a composite hydrogel.

[0046] like Figure 1a and Figure 1b As shown in the figure, the addition of LiCl can cause salting out, inducing the PVA molecular chain to entangle in the subsequent hydrogel formation process. This entanglement is a physical effect, which destroys the microcrystalline area originally formed by hydrogen bonds to a certain extent, helps to form a dense physical cross-linked network structure, and at the same time provides anions and cations to increase conductivity; the addition of conductive polymer PEDOT:PSS increases conductivity, and LiCl is a metal salt that provides cationic Li in the entire hydrogel system. + 、Anion Cl -These ions will be adsorbed on the molecular chains of the hydrogel, thereby forming a network conductive pathway, which synergizes with the electronic conductive network formed by the conductive polymer PEDOT:PSS to form an ion / electronic dual conductive network; acrylic acid monomers are introduced to cooperate with PVA, and the double bonds of the acrylic acid monomer molecules are opened to form polyacrylic acid, and then the carboxyl groups of the molecular chains form hydrogen bonds with the hydroxyl groups on the polyvinyl alcohol molecular chains, which can be used to construct a double network skeleton hydrogel, which is beneficial to improving the mechanical properties of the hydrogel. Ammonium persulfate is used as a thermal initiator. Graphene oxide has good hydrophilicity and has rich oxygen-containing functional groups on its surface, such as carboxyl, hydroxyl and carbonyl groups. These oxygen-containing functional groups are easy to form hydrogen bonds with polyvinyl alcohol molecules, which on the one hand strengthens the hydrogen bond gel network, and on the other hand is beneficial to the dispersion of GO, and can be used as a reinforcing agent and dispersant in the entire gel system.

[0047] Example 1

[0048] The present invention provides a method for preparing an ultra-stretchable double-network composite conductive hydrogel, which specifically comprises the following steps:

[0049] Step 1: Measure 1 g of PVA (molecular weight 205,000) and 23 g of deionized water (at a mass ratio of 1:23), and dissolve them in a 70°C constant temperature water bath while stirring for 1 hour.

[0050] Step 2: Weigh 0.25 g of LiCl and dissolve it in the PVA solution at room temperature. The mass ratio of LiCl to PVA in the mixed solution is 0.5:2.

[0051] Step 3: Weigh 1 g DMSO and 2 g PEDOT:PSS, which is a 1:2 mass ratio of DMSO to PEDOT:PSS. Mix and stir for 10 minutes, then ultrasonically disperse for 15 minutes at 800 W to obtain a PEDOT:PSS mixed solution.

[0052] Step 4: On the basis of step 2, 1 g of the PEDOT:PSS mixed solution obtained in step 3 was added, mixed and stirred for 5 minutes, and ultrasonically dispersed for 15 minutes to obtain a mixed solution A;

[0053] Step 5: Measure 9 g of acrylic acid, 0.045 g of ammonium persulfate, and 0.1 g of graphene oxide. The mass ratio of acrylic acid to ammonium persulfate is 1:0.005.

[0054] Step 6: Add 0.1 g of graphene oxide to acrylic acid and stir evenly. After ultrasonic dispersion, add ammonium persulfate and stir with a glass rod for 10 minutes to obtain a mixed solution B.

[0055] Step 7: The mixed solution A obtained in step 4 and the mixed solution B obtained in step 6 were mixed evenly, ultrasonically dispersed, and then vacuum defoamed for 20 minutes in an environment with a pressure of -0.1 MPa to obtain Figure 2 The dark blue or steel blue PEDOT:PSS composite hydrogel precursor solution shown;

[0056] Step 8: Transfer the precursor solution to the mold and place it at 60℃ for 4 hours for cross-linking reaction. Then freeze it at -10℃, take it out and thaw it at room temperature. Repeat this operation three times to finally obtain a composite hydrogel. Apply a certain tensile force to it, and the hydrogel will undergo tensile deformation, such as Figure 3 As shown, it has good flexibility.

[0057] like Figure 4 As shown, the conductive hydrogel is connected to a power source, a small light bulb, and two wires to form a conductive closed loop, in which the small light bulb and the conductive hydrogel are clamped at both ends of the wires. The small light bulb can be lit normally and when the hydrogel is stretched, it has little effect on the brightness of the small light bulb, indicating its application potential as a stretchable conductor.

[0058] Example 2

[0059] The present invention provides a method for preparing an ultra-stretchable double-network composite conductive hydrogel, which specifically comprises the following steps:

[0060] Step 1: Measure 1 g of PVA (molecular weight 205,000) and 23 g of deionized water (at a mass ratio of 1:23), and dissolve them in a 70°C water bath with stirring for 1 hour.

[0061] Step 2: Weigh 0.5 g of LiCl and dissolve it in the PVA solution at room temperature. The mass ratio of LiCl to PVA in the mixed solution is 1:2.

[0062] Step 3: Weigh 1 g DMSO and 2 g PEDOT:PSS, which is a 1:2 mass ratio of DMSO to PEDOT:PSS. Mix and stir for 15 minutes, then ultrasonically disperse for 30 minutes at 900 W to obtain a PEDOT:PSS mixed solution.

[0063] Step 4: On the basis of step 2, 1 g of the PEDOT:PSS mixed solution obtained in step 3 was added, mixed and stirred for 10 minutes, and ultrasonically dispersed for 30 minutes to obtain a mixed solution A;

[0064] Step 5: Measure 9 g of acrylic acid, 0.045 g of ammonium persulfate, and 0.1 g of graphene oxide. The mass ratio of acrylic acid to ammonium persulfate is 1:0.005.

[0065] Step 6: Add 0.1 g of graphene oxide to acrylic acid and stir evenly. After ultrasonic dispersion, add ammonium persulfate and stir with a glass rod for 10 minutes to obtain a mixed solution B.

[0066] Step 7: The mixed solution A obtained in step 4 and the mixed solution B obtained in step 6 are mixed uniformly, ultrasonically dispersed, and then vacuum defoamed for 20 minutes in an environment with a pressure of -0.1 MPa to obtain a PEDOT:PSS composite hydrogel precursor solution;

[0067] Step 8: Transfer the precursor solution to a mold and place it at 60°C for 4 hours for cross-linking reaction. Then, freeze it at -10°C and thaw it at room temperature. Repeat this process three times to obtain a composite hydrogel.

[0068] Example 3

[0069] The present invention provides a method for preparing an ultra-stretchable double-network composite conductive hydrogel, which specifically comprises the following steps:

[0070] Step 1: Measure 1 g of PVA (molecular weight 205,000) and 23 g of deionized water (at a mass ratio of 1:23), and dissolve them in a 70°C water bath with stirring for 1 hour.

[0071] Step 2: Weigh 0.5 g of LiCl and dissolve it in the PVA solution at room temperature. The mass ratio of LiCl to PVA in the mixed solution is 1:2.

[0072] Step 3: Weigh 1 g DMSO and 2 g PEDOT:PSS, which is a 1:2 mass ratio of DMSO to PEDOT:PSS. Mix and stir for 15 minutes, then ultrasonically disperse for 30 minutes at 700 W to obtain a PEDOT:PSS mixed solution.

[0073] Step 4: On the basis of step 2, 3 g of the PEDOT:PSS mixed solution obtained in step 3 was added, mixed and stirred for 10 minutes, and ultrasonically dispersed for 30 minutes to obtain a mixed solution A;

[0074] Step 5: Measure 9 g of acrylic acid, 0.045 g of ammonium persulfate, and 0.2 g of graphene oxide. The mass ratio of acrylic acid to ammonium persulfate is 1:0.005.

[0075] Step 6: Add 0.2 g of graphene oxide to acrylic acid and stir evenly. After ultrasonic dispersion, add initiator ammonium persulfate and stir with a glass rod for 15 minutes to obtain a mixed solution B.

[0076] Step 7: The mixed solution A obtained in step 4 and the mixed solution B obtained in step 6 are mixed uniformly, ultrasonically dispersed, and then vacuum defoamed for 20 minutes in an environment with a pressure of -0.1 MPa to obtain a PEDOT:PSS composite hydrogel precursor solution;

[0077] Step 8: Transfer the precursor solution to a mold and place it at 60°C for 4 hours for cross-linking reaction. Then, freeze it at -15°C and thaw it at room temperature. Repeat this process four times to obtain a composite hydrogel.

[0078] The prepared conductive hydrogel was then used as a strain sensor to test its sensitivity to strain signals. During the test, the electronic universal tensile machine was used in conjunction with a source meter for measurement. The electronic universal tensile machine was used to control the stretching speed and strain size of the sample, and the source meter was used to detect the resistance change of the sample in real time. The resistance change of the sample is expressed as R / R0, where R represents the real-time resistance of the sample and R0 represents the initial resistance of the sample. Figure 7 The test results show that the hydrogel has good linear responsiveness when used as a tensile strain sensor under 0-400% tensile strain.

[0079] Mechanical properties test: The hydrogel was subjected to tensile strain test using a universal material testing machine. Figure 5 As shown, the hydrogel can withstand a deformation of up to 2160% of its own and has excellent tensile properties.

[0080] Conductivity test: Use a digital four-probe tester to test the resistance of the conductive hydrogel. It mainly includes a host test bench, a four-probe head and a computer. The testable conductivity range is 10 -5 ~10 4 s / m, the basic spacing of the four-probe probes is 1±0.01mm. During the test, cut the hydrogel into a size of 400mm×500mm for testing. After the digital four-probe tester is turned on for self-test, set the current indicator to 1mA and the voltage range indicator to 2V. Enter the sample thickness as 2mm and click the test button to test. Figure 6 It can be seen that the electrical conductivities of the three examples are 5.17, 6.54, and 8.87 s / m, indicating that they all have good electrical conductivity. The increase in conductivity from Example 1 to Example 2 is due to the increase in LiCl content and the increase in anions and cations. The increase in conductivity from Example 2 to Example 3 is due to the increase in graphene oxide, which makes the conductive network inside the hydrogel more dense and the conductivity enhanced.

Claims

1. A method for preparing an ultra-stretchable double-network composite conductive hydrogel, characterized in that: The steps include: S1, dissolving LiCl in a polyvinyl alcohol aqueous solution, with a mass ratio of LiCl to polyvinyl alcohol being (0.5-1):2, to obtain a mixed solution; S2, uniformly dispersing the DMSO aqueous solution and the PEDOT:PSS aqueous solution to obtain a PEDOT:PSS mixed solution, wherein the mass ratio of DMSO to PEDOT:PSS is 5:(3-3.8), the solid content of the PEDOT:PSS aqueous solution is 1.5-1.9%, the conductivity is 600-700 S / cm, and the mass percentage concentration of the DMSO aqueous solution is 5%, and then uniformly dispersing the PEDOT:PSS mixed solution and the mixed solution at a mass ratio of 3:(24.25-24.5) to obtain a mixed system A; Graphene oxide was added to acrylic acid and dispersed evenly, and then ammonium persulfate was added and mixed evenly. The mass ratio of graphene oxide, acrylic acid and ammonium persulfate (0.1-0.2):9:0.045 was obtained to obtain a mixed system B. S3, according to the mass ratio of (25.25~27.5): (9.145~9.245), the mixed system A and the mixed system B are evenly dispersed, and then vacuum defoamed and cross-linked at 60~70℃ for 4~5h. Finally, they are frozen at -15~-10℃ and then thawed at room temperature. The operation is repeated 3~4 times to obtain an ultra-stretchable double-network composite conductive hydrogel.

2. The method for preparing the ultra-stretchable double-network composite conductive hydrogel according to claim 1, characterized in that: The polyvinyl alcohol described in S1 has a molecular weight of 205,000. The polyvinyl alcohol is stirred in deionized water at 70 to 80° C. for 1 to 1.5 hours to obtain a polyvinyl alcohol solution.

3. The method for preparing the ultra-stretchable double-network composite conductive hydrogel according to claim 1, wherein: In the step S2, the DMSO aqueous solution and the PEDOT:PSS aqueous solution are first stirred for 10 to 15 minutes, and then ultrasonically dispersed for 15 to 30 minutes at an ultrasonic power of 700 to 900 W to obtain a PEDOT:PSS mixed solution.

4. The method for preparing the ultra-stretchable double-network composite conductive hydrogel according to claim 1, wherein: After adding the PEDOT:PSS mixed solution to the mixed solution of S2, stirring was first performed for 5 to 10 minutes, and then ultrasonic dispersion was performed for 15 to 30 minutes at an ultrasonic power of 700 to 900 W to obtain a mixed solution A.

5. The method for preparing the ultra-stretchable double-network composite conductive hydrogel according to claim 1, characterized in that: In the step S2, graphene oxide is added to acrylic acid and stirred evenly, and then ammonium persulfate is added after ultrasonic dispersion and stirred for 10 to 15 minutes to obtain a mixed system B.

6. The method for preparing the ultra-stretchable double-network composite conductive hydrogel according to claim 1, characterized in that: In the step S3, the mixed system A and the mixed system B are mixed and stirred for 5 to 10 minutes, and then ultrasonically dispersed at 0 to 5° C., and finally vacuum defoamed at a pressure of -0.15 to -0.1 MPa for 20 to 30 minutes.

7. An ultra-stretchable double-network composite conductive hydrogel obtained by the preparation method of the ultra-stretchable double-network composite conductive hydrogel according to any one of claims 1 to 6.

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