Waterproof flexible conductive film and preparation method and application thereof

Abstract

The invention provides a waterproof flexible conductive film. The waterproof flexible conductive film comprises the following components in parts by weight: 0.5-0.7 part of a conductive polymer; 40-60 parts by weight of an elastomer material; 1-3 parts by weight of a structure modifier; the structure regulator is glycosaminoglycan. Compared with the prior art, a proper amount of structure regulator is added into the flexible conductive film, so that the phase separation process of a system can be effectively regulated and controlled, the flexible conductive film is subjected to gradient phase separation in the film forming process, the side with low crosslinking density is viscous, and the side with high crosslinking density is non-viscous; meanwhile, the elastomer material is added, so that the mechanical tensile property of the conductive film can be improved, and the conductive film has waterproofness and can be used for long-range monitoring of electrophysiological signals.

Description

Technical Field

[0001] The present invention belongs to the technical field of conductive materials, and in particular relates to a waterproof flexible conductive film and a preparation method and application thereof. Background Art

[0002] With the development of miniaturization, flexibility and multifunctionality of electronic devices, flexible conductive materials have become a hot topic for domestic and foreign scholars. Flexible conductive materials are flexible and conductive and are widely used in health management materials, sensors, wearable devices and other fields. In the field of medical diagnosis and treatment, flexible conductive materials can be used to detect human blood pressure, electrocardiogram, electromyography, electroencephalogram, breathing, swallowing function, etc. The electrophysiological indicators obtained can provide corresponding health information.

[0003] Electrophysiology involves recording electrical signals or influencing signals by transferring electrical charges using electrodes as stimuli. Electrodes are critical to both technologies as an interface between humans and devices. Given the need for electrophysiological information and the comfort of the device, such electrodes require high signal quality while also having good flexibility, stretchability, and reliable adhesion. They also need to have certain waterproof and sweat-proof properties to facilitate users to wear them in daily life.

[0004] Currently, most conductive films are composed of conductive polymer PEDOT:PSS and some other water-soluble substances. Flexible electrode films are obtained after drying. However, the conductive films are not waterproof and are easily damaged when sweating a lot after exercise or taking a shower. Summary of the invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide a waterproof flexible conductive film and a preparation method and application thereof.

[0006] The present invention provides a waterproof flexible conductive film, comprising:

[0007] 0.5-0.7 parts by weight of conductive polymer;

[0008] 40-60 parts by weight of elastomeric material;

[0009] 1 to 3 parts by weight of a structural regulator;

[0010] The structural modifier is glycosaminoglycan.

[0011] Preferably, the conductive polymer is selected from conductive polymer PEDOT:PSS;

[0012] The structure regulator is hyaluronic acid.

[0013] Preferably, the elastomeric material is selected from one or more of silicone rubber, polyurethane, polyolefin elastomer, polystyrene elastomer and polyamide elastomer.

[0014] Preferably, the mass ratio of PEDOT to PSS in the conductive polymer PEDOT:PSS is 1:2 to 1:3;

[0015] and / or, the molecular weight of the glycosaminoglycan is 250-400 kDa;

[0016] And / or, the elastomeric material is formed by an elastomeric prepolymer and a curing agent; the mass ratio of the elastomeric prepolymer to the curing agent is 10:1 to 1:2.

[0017] Preferably, it includes:

[0018] 0.56-0.58 parts by weight of conductive polymer;

[0019] 45-50 parts by weight of elastomeric material;

[0020] 1.4 to 2.5 parts by weight of structural regulator.

[0021] Preferably, the elastomeric material is formed by an elastomeric prepolymer and a curing agent; the mass ratio of the elastomeric prepolymer to the curing agent is 1.3:1 to 1:1.

[0022] Preferably, the waterproof flexible conductive film has a thickness of 20 to 500 μm.

[0023] The present invention also provides a method for preparing the waterproof flexible conductive film, comprising the following steps:

[0024] S1) mixing a conductive polymer aqueous solution with a polar solvent to obtain a solution A;

[0025] S2) mixing the solution A with a structure regulator to obtain a solution B;

[0026] S3) mixing the solution B with an elastomeric material to obtain a solution C;

[0027] S4) drying the solution C to form a film to obtain a waterproof flexible conductive film.

[0028] Preferably, the mass ratio of the conductive polymer to the polar solvent in the conductive polymer aqueous solution is (0.5-0.7): (0.5-2).

[0029] Preferably, the polar solvent is selected from ethylene glycol and / or dimethyl sulfoxide.

[0030] Preferably, the elastomeric material comprises an elastomeric prepolymer and a curing agent; the mass ratio of the elastomeric prepolymer to the curing agent is 10:1 to 1:2.

[0031] Preferably, the drying and film-forming temperature is 60°C to 150°C.

[0032] The present invention also provides a flexible electronic device, comprising the above-mentioned waterproof flexible conductive film.

[0033] The present invention provides a waterproof flexible conductive film, comprising: 0.5-0.7 parts by weight of a conductive polymer; 40-60 parts by weight of an elastomeric material; 1-3 parts by weight of a structural regulator; and the structural regulator is glycosaminoglycan. Compared with the prior art, the present invention adds an appropriate amount of a structural regulator to the flexible conductive film, which can effectively regulate the phase separation process of the system, so that the flexible conductive film undergoes gradient phase separation during the film formation process, making the side with a low cross-linking density sticky and the side with a high cross-linking density non-sticky; at the same time, adding an elastomeric material can improve the mechanical tensile properties of the conductive film and make it waterproof, which can be used for long-range monitoring of electrophysiological signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a photo of testing the waterproof performance of the waterproof flexible conductive film obtained in Example 2 of the present invention;

[0035] Figure 2 This is a photograph of an object adhered to the waterproof flexible conductive film obtained in Example 2 of the present invention and immersed in water;

[0036] Figure 3 These are the test results of the ECG signal conduction performance of the flexible electrodes prepared from the waterproof flexible conductive films obtained in Example 1, Example 2 and Comparative Example 3 of the present invention. DETAILED DESCRIPTION

[0037] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0038] The present invention provides a waterproof flexible conductive film, comprising:

[0039] 0.5-0.7 parts by weight of conductive polymer;

[0040] 40-60 parts by weight of elastomeric material;

[0041] 1 to 3 parts by weight of a structural regulator;

[0042] The structural modifier is glycosaminoglycan.

[0043] Optionally, the content of the conductive polymer in the waterproof flexible conductive film is 0.5 parts by weight, 0.55 parts by weight, 0.6 parts by weight, 0.65 parts by weight, 0.7 parts by weight or a range between any two of the above values; the conductive polymer is preferably a conductive polymer PEDOT:PSS; the mass ratio of PEDOT to PSS in the conductive polymer PEDOT:PSS is preferably 1:2 to 1:3, more preferably 1:2.5.

[0044] Optionally, the content of the elastomeric material in the waterproof flexible conductive film is 40 parts by weight, 45 parts by weight, 50 parts by weight, 55 parts by weight, 60 parts by weight or a range between any two of the above values; the elastomeric material can be an elastomeric material well known to those skilled in the art without any special restrictions. In the present invention, it is preferably one or more of silicone rubber, polyurethane, polyolefin elastomer, polystyrene elastomer and polyamide elastomer.

[0045] In a specific embodiment provided by the present invention, the elastomeric material is formed by an elastomeric prepolymer and a curing agent; the mass ratio of the elastomeric prepolymer to the curing agent is preferably 10:1 to 1:2; optionally, the mass ratio of the elastomeric prepolymer to the curing agent is 10:1, 9:1, 8:1, 7:1, 6:1, 5:1, 4:1, 3:1, 2:1, 1.5:1, 1.3:1, 1.2:1, 1.1:1, 1:1, 1:1.5, 1:2 or a range between any two of the above ratios; the elastomeric prepolymer is an elastomeric prepolymer well known to those skilled in the art, and there is no special limitation. In the present invention, it is preferably one or more of PDMS prepolymer, polyurethane prepolymer, polyolefin prepolymer, polystyrene prepolymer and polyamide prepolymer; in the embodiment provided by the present invention, SYLGARD 184 is used as an example for explanation; the curing agent can be any curing agent well known to those skilled in the art without any special limitation. In the present invention, it is preferably one or more of polyamines, polyols and acid anhydrides; specifically, it can be selected according to the type of elastomer prepolymer and its matching curing agent can be selected.

[0046] In a specific embodiment provided by the present invention, the elastomeric material is formed by an elastomeric prepolymer and a curing agent; the mass ratio of the elastomeric prepolymer to the curing agent is preferably 1.3:1 to 1:1, and more preferably 1.25:1 to 1.1:1.

[0047] Optionally, the content of the structural regulator in the waterproof flexible conductive film is 1 weight part, 1.2 weight parts, 1.4 weight parts, 1.5 weight parts, 1.9 weight parts, 2 weight parts, 2.2 weight parts, 2.5 weight parts, 2.8 weight parts, 3 weight parts or a range between any two of the above values; the structural regulator is preferably a glycosaminoglycan, more preferably hyaluronic acid; the molecular weight of the glycosaminoglycan is preferably 250-400 kDa, more preferably 280-400 kDa, more preferably 300-380 kDa, more preferably 320-350 kDa, and most preferably 330 kDa; the intrinsic viscosity of the glycosaminoglycan is preferably 6.5-7.5 dL / g, more preferably 6.8-7.5 dL / g, more preferably 7.0-7.3 dL / g, more preferably 7.1-7.2 dL / g, and most preferably 7.19 dL / g.

[0048] In a specific embodiment provided by the present invention, the waterproof flexible conductive film comprises:

[0049] 0.56-0.58 parts by weight of conductive polymer;

[0050] 45-50 parts by weight of elastomeric material;

[0051] 1.4 to 2.5 parts by weight of structural regulator.

[0052] In a specific embodiment provided by the present invention, the waterproof flexible conductive film comprises:

[0053] 0.57 parts by weight of conductive polymer;

[0054] 45.55 parts by weight of elastomeric material;

[0055] 1.99 parts by weight of structure regulator.

[0056] In a specific embodiment provided by the present invention, the waterproof flexible conductive film comprises:

[0057] 0.57 parts by weight of conductive polymer;

[0058] 49.51 parts by weight of elastomeric material;

[0059] 1.98 parts by weight of structure regulator.

[0060] In a specific embodiment provided by the present invention, the waterproof flexible conductive film comprises:

[0061] 0.58 parts by weight of conductive polymer;

[0062] 49.51 parts by weight of elastomeric material;

[0063] 1.49 parts by weight of structure regulator.

[0064] In a specific embodiment provided by the present invention, the waterproof flexible conductive film comprises:

[0065] 0.56 parts by weight of conductive polymer;

[0066] 49.55 parts by weight of elastomeric material;

[0067] 2.48 parts by weight of structure regulator.

[0068] Since the present invention uses an organic solvent when preparing the waterproof flexible conductive film, the organic solvent is preferably ethylene glycol and / or dimethyl sulfoxide; during the drying and film-forming process, the organic solvent will evaporate, but some will remain in the waterproof flexible conductive film obtained by film formation.

[0069] The amount of organic solvent used in the raw materials for preparing the waterproof flexible conductive film is preferably 0.5 to 2 parts by weight; optionally, the amount of the organic solvent is 0.5 parts by weight, 1 part by weight, 1.5 parts by weight, 2 parts by weight or a range between any two of the above values; in some embodiments provided by the present invention, the amount of the organic solvent is preferably 0.5 to 1.5 parts by weight, more preferably 0.8 to 1.2 parts by weight, and even more preferably 0.9 to 1 part by weight.

[0070] According to the present invention, the thickness of the waterproof flexible conductive film is preferably 20 to 500 μm; optionally, the thickness of the waterproof flexible conductive film is 20 μm, 50 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm, 500 μm or a range between any two of the above values.

[0071] According to the present invention, the sheet resistance of the waterproof flexible conductive film is preferably 300-550 kΩ / □, and more preferably 303-530.6 kΩ / □.

[0072] According to the present invention, the elongation at break of the waterproof flexible conductive film is preferably 50% to 70%, and more preferably 53% to 69.5%.

[0073] According to the present invention, the adhesion of the waterproof flexible conductive film is preferably 0.2 to 0.6 N / cm, and more preferably 0.21 to 0.52 N / cm.

[0074] The waterproof flexible conductive film provided by the present invention has stretchability, adhesion and waterproofness, and can be used for long-range monitoring of electrophysiological signals.

[0075] The present invention also provides a method for preparing the above-mentioned waterproof flexible conductive film, comprising the following steps: S1) mixing a conductive polymer aqueous solution with a polar solvent to obtain a solution A; S2) mixing the solution A with a structure regulator to obtain a solution B; S3) mixing the solution B with an elastomeric material to obtain a solution C; S4) drying the solution C to form a film to obtain a waterproof flexible conductive film.

[0076] The present invention has no special restrictions on the sources of all raw materials, and any raw materials available on the market can be used; the conductive polymer, structure regulator and elastomeric material are the same as those described above and will not be described in detail here.

[0077] A conductive polymer aqueous solution is mixed with a polar solvent to obtain a solution A; the mass concentration of the conductive polymer in the conductive polymer aqueous solution is preferably 1.0% to 1.3%; the mass ratio of the conductive polymer to the polar solvent in the conductive polymer aqueous solution is preferably (0.5 to 0.7): (0.5 to 2), more preferably (0.5 to 0.6): (0.5 to 1), more preferably (0.55 to 0.6): (0.9 to 1), and most preferably (0.56 to 0.58): (0.91 to 0.98); the polar solvent can be a polar solvent well known to those skilled in the art without any special restrictions, and is preferably ethylene glycol and / or dimethyl sulfoxide in the present invention; the mixing method can be a method well known to those skilled in the art without any special restrictions, and is preferably stirring in the present invention; the mixing is preferably carried out at room temperature; the mixing time is preferably 0.1 to 1 h, more preferably 0.3 to 0.8 h, and more preferably 0.5 h.

[0078] The solution A is mixed with a structure regulator to obtain a solution B.

[0079] The solution B is mixed with an elastomeric material to obtain a solution C. In a specific embodiment provided by the present invention, the elastomeric material comprises an elastomeric prepolymer and a curing agent. The mass ratio of the elastomeric prepolymer to the curing agent is preferably 10:1 to 1:2. Optionally, the mass ratio of the elastomeric prepolymer to the curing agent is 10:1, 9:1, 8:1, 7:1, 6:1, 5:1, 4:1, 3:1, 2:1, 1.5:1, 1.2:1, 1.1:1, 1:1, 1:1.5, 1:2 or a range between any two of the above ratios. The elastomeric prepolymer is any elastomeric prepolymer well known to those skilled in the art without any special restrictions. In the present invention, it is preferably one or more of PDMS prepolymer, polyurethane prepolymer, polyolefin prepolymer, polystyrene prepolymer and polyamide prepolymer. In the embodiment provided by the present invention, SYLGARD 184 is used as an example for explanation; the curing agent can be any curing agent well known to those skilled in the art without any special limitation. In the present invention, it is preferably one or more of polyamines, polyols and acid anhydrides; specifically, it can be selected according to the type of elastomer prepolymer and its matching curing agent can be selected.

[0080] The solution C is dried to form a film to obtain a waterproof flexible conductive film; in a specific embodiment provided by the present invention, the solution C is preferably dripped on a substrate, dried to form a film, and then peeled off to obtain a waterproof flexible conductive film; the drying film-forming temperature is preferably 60°C to 150°C; optionally, the drying film-forming temperature is 60°C, 70°C, 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C or a range between any two ratios of the above; the drying film-forming time is preferably more than 6 hours.

[0081] The present invention adds an appropriate amount of structure regulator to the flexible conductive film, which can effectively regulate the phase separation process of the system, so that the flexible conductive film undergoes gradient phase separation during the film formation process, making the side with low cross-linking density sticky and the side with high cross-linking density non-sticky; at the same time, adding an elastomeric material can improve the mechanical tensile properties of the conductive film and make it waterproof, which can be used for long-term monitoring of electrophysiological signals.

[0082] The present invention also provides a flexible electronic device, comprising the above-mentioned waterproof flexible conductive film.

[0083] In a specific embodiment provided by the present invention, the flexible electronic device includes a flexible electrode; the flexible electrode includes a waterproof flexible conductive film and a conductive tape; the waterproof flexible conductive film and the conductive tape are connected to each other; the conductive tape can be a conductive tape well known to those skilled in the art without any special restrictions, and copper conductive tape is preferably used in the present invention.

[0084] In order to further illustrate the present invention, a waterproof flexible conductive film provided by the present invention and a preparation method and application thereof are described in detail below in conjunction with embodiments.

[0085] The reagents used in the following examples are all commercially available.

[0086] In certain embodiments of the present invention, the PEDOT:PSS aqueous solution is commonly available on the market, such as Clevios PH1000, with a solid content of 1.0% to 1.3%, wherein the mass ratio of PEDOT to PSS is 1:2.5.

[0087] In certain embodiments of the present invention, the PDMS mixture composition includes DOWSIL SYLGARD 184 Silicon prepolymer and a curing agent.

[0088] The molecular weight of the hyaluronic acid used in the examples is 330 kDa, and the intrinsic viscosity is 7.19 dL / g.

[0089] Example 1 to Example 4

[0090] Prepare according to the recipe in Table 1 and the following preparation method.

[0091] (1) Add ethylene glycol to the PEDOT:PSS aqueous solution and stir at room temperature for 0.5 h to mix well;

[0092] (2) adding hyaluronic acid to the above solution and stirring evenly;

[0093] (3) mixing PDMS prepolymer (DOWSIL SYLGARD 184 Silicon prepolymer) and curing agent in a certain proportion;

[0094] (4) mixing the solution obtained in step (2) and the solution obtained in step (3) at a certain ratio at high speed;

[0095] (5) The mixed solution of step (4) was added dropwise to a disposable culture dish, dried at 100° C. for more than 6 h, and peeled off after cooling to obtain a waterproof flexible conductive film with a thickness of 116 μm.

[0096] Table 1 Formulation of waterproof flexible conductive film

[0097]

[0098] Note: The amount of each component in Table 1 plus the solvent in the PEDOT:PSS aqueous solution is 100%.

[0099] Comparative Example 1

[0100] The difference from Example 2 is:

[0101] In step (1):

[0102] The PEDOT:PSS aqueous solution was replaced with the same amount of deionized water.

[0103] The content of each component is as follows:

[0104] PEDOT:PSS 0wt%, PDMS prepolymer 26.06wt%, hyaluronic acid 1.98wt%, ethylene glycol 0.98wt%, curing agent 23.45wt%.

[0105] Comparative Example 2

[0106] The difference from Example 2 is:

[0107] Without adding hyaluronic acid, the content of each component is as follows:

[0108] PEDOT:PSS 0.58wt%, PDMS prepolymer 26.59wt%, hyaluronic acid 0wt%, ethylene glycol 1.00wt%, supporting curing agent 23.93wt%.

[0109] Comparative Example 3

[0110] The difference from Example 2 is:

[0111] In step (1):

[0112] The solution is a PEDOT:PSS aqueous solution.

[0113] Without adding ethylene glycol, the contents of each component are as follows:

[0114] PEDOT:PSS 0.58wt%, PDMS prepolymer 26.32wt%, hyaluronic acid 2.0wt%, ethylene glycol 0wt%, supporting curing agent 23.68wt%.

[0115] The electrical and mechanical properties of the waterproof flexible conductive films obtained in Examples 1 to 4 and Comparative Examples 1 to 3 were tested. The testing method is as follows:

[0116] (1) Conductivity test: The test was performed using a four-probe resistance tester. The test strip length was 20 mm and the strip width was 15 mm. The results are shown in Table 2.

[0117] (2) Elongation at break test: The test was conducted using a universal tensile testing machine, with a test temperature of 22°C and a tensile speed of 5 mm / min. The specimen was cut into a dumbbell shape, the effective length for stretching was 20 mm, and the specimen width was 4 mm. The results are shown in Table 2.

[0118] (3) Adhesion test: The adhesion of the film on the glass sheet was tested by interfacial adhesion according to the standard 90-degree peel test method. The peeling speed was 5 mm / s, the sample length was 25 mm, and the width was 10 mm. The results are shown in Table 2.

[0119] Table 2 Electrical and mechanical properties of flexible conductive films

[0120] Group Square resistance (kΩ / □) Elongation at break (%) Adhesion force (N / cm) Example 1 530.6 65.3 0.34 Example 2 340.3 67.9 0.52 Example 3 303.5 69.4 0.28 Example 4 427.3 53.5 0.21 Comparative Example 1 ＞5000 84.3 0.72 Comparative Example 2 16.2 5.2 0 Comparative Example 3 480.2 45.6 0.16

[0121] As shown in Table 2, the conductive films obtained in Examples 1 to 4 have good stretchability and adhesion. Comparative Example 1 does not contain a conductive polymer and has no conductive properties. Comparative Example 2 does not contain hyaluronic acid, and the flexible conductive film has no adhesion. Comparative Example 3 does not contain ethylene glycol, and the stretchability and adhesion properties of the flexible conductive film are slightly worse than those of Example 2.

[0122] The waterproof performance of the waterproof flexible conductive film obtained in Example 2 was tested, and the following picture was obtained: Figure 1 The flexible conductive film did not change after being rinsed with water for 5 minutes.

[0123] The waterproof performance of the waterproof flexible conductive film obtained in Example 2 was tested, and the following picture was obtained: Figure 2 As shown, the flexible conductive film can still maintain its stickiness when the object is immersed in water.

[0124] The waterproof flexible conductive films obtained in Example 1, Example 2 and Comparative Example 3 were connected with copper conductive adhesive to prepare flexible electrodes, and their ECG signal performance was tested. The specific testing method is as follows:

[0125] A working electrode (flexible electrode) and a reference electrode (flexible electrode) were attached to the subject's forearm with a spacing of 5 cm, and another working electrode (flexible electrode) was attached to the other forearm. The three electrodes were connected to an ECG signal acquisition device (3IT_EEG OBCI Kits) to record ECG signals.

[0126] Test results such as Figure 3 shown.

[0127] The signals measured by the flexible electrodes of Example 1 and Example 2 have clear feature points, which are sufficient for subsequent signal analysis.

[0128] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A waterproof flexible conductive film, characterized in that: include: 0.5-0.7 parts by weight of conductive polymer; 40-60 parts by weight of elastomeric material; 1 to 3 parts by weight of a structural regulator; The structural modifier is glycosaminoglycan.

2. The waterproof flexible conductive film according to claim 1, characterized in that: The conductive polymer is selected from the conductive polymer PEDOT:PSS; The structural regulator is hyaluronic acid; And / or, the elastomeric material is selected from one or more of silicone rubber, polyurethane, polyolefin elastomer, polystyrene elastomer and polyamide elastomer.

3. The waterproof flexible conductive film according to claim 2, characterized in that: The mass ratio of PEDOT to PSS in the conductive polymer PEDOT:PSS is 1:2 to 1:3; and / or, the molecular weight of the glycosaminoglycan is 250-400 kDa; And / or, the elastomeric material is formed by an elastomeric prepolymer and a curing agent; the mass ratio of the elastomeric prepolymer to the curing agent is 10:1 to 1:

2.

4. The waterproof flexible conductive film according to any one of claims 1 to 3, characterized in that: include: 0.56-0.58 parts by weight of conductive polymer; 45-50 parts by weight of elastomeric material; 1.4 to 2.5 parts by weight of structural regulator.

5. The waterproof flexible conductive film according to any one of claims 1 to 4, characterized in that: The elastomer material is formed by an elastomer prepolymer and a curing agent; the mass ratio of the elastomer prepolymer to the curing agent is 1.3:1 to 1:1; And / or, the waterproof flexible conductive film has a thickness of 20 to 500 μm.

6. A method for preparing the waterproof flexible conductive film according to claim 1, characterized in that: The following steps are involved: S1) mixing a conductive polymer aqueous solution with a polar solvent to obtain a solution A; S2) mixing the solution A with a structure regulator to obtain a solution B; S3) mixing the solution B with an elastomeric material to obtain a solution C; S4) drying the solution C to form a film to obtain a waterproof flexible conductive film.

7. The preparation method according to claim 6, characterized in that: The mass ratio of the conductive polymer to the polar solvent in the conductive polymer aqueous solution is (0.5-0.7): (0.5-2).

8. The preparation method according to claim 6, characterized in that: The polar solvent is selected from ethylene glycol and / or dimethyl sulfoxide; The elastomer material comprises an elastomer prepolymer and a curing agent; the mass ratio of the elastomer prepolymer to the curing agent is 10:1 to 1:

2.

9. The preparation method according to claim 6, characterized in that: The drying and film-forming temperature is 60°C to 150°C.

10. A flexible electronic device, characterized in that: The invention comprises the waterproof flexible conductive film according to any one of claims 1 to 5 or the waterproof flexible conductive film prepared by any one of the preparation methods according to claims 6 to 9.

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