Chlorinated carbon nanotubes, chlorinated carbon nanotube-based conductive elastomers, and preparation methods and applications thereof

Abstract

The invention discloses a chlorinated carbon nanotube, a chlorinated carbon nanotube-based conductive elastomer, a preparation method and an application. The preparation method comprises the following steps: placing a mixture of carbon nanotubes and a chlorine source precursor in a reaction tube, and then calcining the reaction tube at 400-900°C for 2-5h after vacuum sealing to obtain the chlorinated carbon nanotube; the mass ratio of the carbon nanotube to the chlorine source precursor is 1:(0.4-2.3). The chlorinated carbon nanotube prepared by the present invention can improve the surface activity of the carbon nanotube, help to enhance the direct interface interaction with the silicone elastomer, effectively improve the interface strength of the carbon nanotube and the matrix silicone rubber, solve the defects of the traditional carbon nano-based conductive filler and the silicone rubber interface bonding force being weak and difficult to achieve high conductivity and high elasticity; the prepared chlorinated carbon nanotube-based conductive elastomer has high conductivity, high tensile properties and high strength.

Description

Technical Field

[0001] The invention specifically relates to a chlorinated carbon nanotube, a chlorinated carbon nanotube-based conductive elastomer, and a preparation method and application thereof. Background Art

[0002] Flexible and stretchable electrodes play a key role in flexible electronics and are suitable for electronic skin, physiological monitoring and wearable devices. Traditional rigid electrodes are difficult to adapt to human body curves and movements, while flexible and stretchable electrodes provide an ideal solution for innovative medical and smart wearables with their outstanding deformability and conductivity. In existing solutions, carbon nanotubes are usually combined with silicone rubber to prepare flexible and stretchable conductive components. However, there are usually some problems in the process of compounding traditional carbon nanotubes with silicone elastomers: 1. Uniform dispersion problem. Traditional carbon nanotube fillers are often difficult to disperse evenly in the silicone rubber matrix, resulting in uneven conductivity and mechanical properties; 2. Weak interface interaction: The interface interaction between silicone rubber and carbon nanotubes is weak, and it is difficult to form a good combination, which limits the comprehensive performance of the combined material; 3. The contradiction between conductivity and elasticity: While traditional carbon nanotube fillers improve conductivity, they often have a negative impact on the elastic properties of silicone rubber, resulting in a contradiction between flexibility and conductivity of the conductive composition.

[0003] Therefore, how to improve the interface properties between carbon nanotubes and silicone elastomers, enhance the compatibility of carbon nanotube materials and silicone elastomers, and prepare elastic conductive compositions with high conductivity, high strength and high toughness are current problems and difficulties that need to be solved urgently. Summary of the invention

[0004] The technical problem solved by the present invention is to overcome the defects of weak interface interaction and poor compatibility between carbon nanotube materials and silicone elastomers in the prior art, and provide a chlorinated carbon nanotube, a chlorinated carbon nanotube-based conductive elastomer, and a preparation method and application. The chlorinated carbon nanotube-based conductive elastomer prepared by the present invention has high conductivity, high tensile properties and high strength.

[0005] The present invention prepares chlorinated carbon nanotubes by calcining carbon nanotubes and a chlorine source in a vacuum-sealed reaction tube. As the temperature rises, the chlorine source polymer will first decompose to generate Cl free radicals, and the Cl free radicals contain unpaired electrons, so they have high reactivity. Under high temperature conditions, when the Cl free radicals approach the CC bond, the unpaired electrons can react with the electrons in the CC bond, thereby weakening the CC bond and eventually breaking it. Once the CC bond breaks, the carbon free radicals generated by it are very active and will pair with the unpaired electrons in the Cl free radicals to form stable Cl-C covalent bonds. The formation of C-Cl chemical bonds can improve the electronic structure of carbon nanotubes, and polar Cl atoms tend to obtain electrons from carbon atoms to form Cl ions with partial negative charges and carbon nanotubes with partial positive charges, thereby affecting the electron distribution on the surface of the carbon nanotubes, thereby changing their electronic transmission characteristics. The chlorinated carbon nanotubes prepared by this method can be used as conductive fillers to build a conductive nano-interconnection network in the silicone rubber elastic matrix. The chlorine atoms with high electron affinity on the surface can adjust the band structure of the carbon nanotubes, improve the surface activity of the carbon nanotubes, help enhance the direct interface interaction with the silicone elastomer, and effectively improve the interface strength between the carbon nanotubes and the matrix silicone rubber, thus solving the problem of difficulty in achieving high conductivity and high elasticity due to the weak interface bonding force between traditional carbon nano-based conductive fillers and silicone rubber.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a method for preparing chlorinated carbon nanotubes, which comprises the following steps:

[0008] A mixture of carbon nanotubes and a chlorine source precursor is placed in a reaction tube, and the reaction tube is vacuum sealed and calcined at 400-900° C. for 2-5 hours to obtain the chlorinated carbon nanotubes; the mass ratio of the carbon nanotubes to the chlorine source precursor is 1:(0.4-2.3).

[0009] In the present invention, the diameter of the carbon nanotube may be 5-20 nm, preferably 8-15 nm. The length of the carbon nanotube may be 20-55 μm, preferably 45-55 μm, for example 50 μm. The carbon nanotube may be a multi-walled carbon nanotube.

[0010] In the present invention, the chlorine source precursor is preferably one or more of hexachlorobenzene, PVC and PVDC, more preferably PVC.

[0011] In the present invention, the mass ratio of the carbon nanotubes to the chlorine source precursor is, for example, 1:0.43, 1:0.5, 1:0.67, 1:1, 1:1.1, 1:1.5 or 1:2.3, preferably 1:(0.9-1.1).

[0012] In the present invention, the preparation method of the mixture of carbon nanotubes and chlorine source precursor can be conventional in the art, and preferably comprises the following steps: grinding the carbon nanotubes and chlorine source precursor uniformly.

[0013] In the present invention, the reaction tube may be a quartz tube.

[0014] In the present invention, after the vacuum sealing, the vacuum degree of the reaction tube is preferably less than or equal to 10- 3 Pa.

[0015] In the present invention, the rate of increasing the temperature to the calcination temperature may be 2-10° C. / min, such as 2° C. / min or 5° C. / min.

[0016] In the present invention, the calcination temperature is, for example, 400°C, 450°C, 500°C or 600°C, preferably 500-600°C.

[0017] In the present invention, the calcination time is preferably 2-4 hours, such as 3 hours.

[0018] In the present invention, according to the common practice in the art, after the calcination is completed, it is generally necessary to cool naturally to room temperature.

[0019] In the present invention, after the calcination is completed, washing and drying are generally required. The residual carbon generated after the decomposition of the chlorine source precursor can be removed by washing. The washing can generally be carried out with water and / or ethanol, for example, washing with water and ethanol three times respectively.

[0020] The present invention also provides a chlorinated carbon nanotube prepared by the above-mentioned preparation method.

[0021] The present invention also provides a chlorinated carbon nanotube-based conductive elastomer, which comprises a chlorinated carbon nanotube self-supporting film and silica gel. The chlorinated carbon nanotube self-supporting film is made from the chlorinated carbon nanotubes as described above.

[0022] In the present invention, the thickness of the chlorinated carbon nanotube self-supporting film may be 20-200 μm.

[0023] In the present invention, the surface loading of the chlorinated carbon nanotube self-supporting film can be 0.5 mg / cm 2 -2mg / cm 2 The surface loading refers to the mass of chlorinated carbon nanotubes contained in each square centimeter of the self-supporting film.

[0024] In the present invention, the silicone can be one or more of Dragon Skin silicone, Ecoflex and PDMS (polydimethylsiloxane), preferably Dragon Skin silicone.

[0025] In the present invention, in the chlorinated carbon nanotube-based conductive elastomer, the silica gel is not only distributed on the surface of the chlorinated carbon nanotubes, but also embedded in the gaps of the chlorinated carbon nanotube conductive network.

[0026] In the present invention, the thickness of the silica gel covering the surface of the chlorinated carbon nanotube self-supporting film may be 0.1-2 mm.

[0027] In the present invention, the method for preparing the chlorinated carbon nanotube self-supporting film preferably comprises the following steps: after the solution containing the chlorinated carbon nanotubes is dispersed uniformly, suction filtration is performed.

[0028] Wherein, in the solution of chlorinated carbon nanotubes, the solvent may be one or more of ethanol, deionized water, NMP and DMF, such as ethanol.

[0029] The concentration of the chlorinated carbon nanotube solution may be 0.2-20 mg / mL, preferably 0.4-2 mg / mL, such as 0.5 mg / mL. The concentration refers to the mass of the chlorinated carbon nanotubes contained in each milliliter of the chlorinated carbon nanotube solution.

[0030] The dispersion method may be mechanical stirring, ultrasound or ball milling.

[0031] In some embodiments, the dispersion process may be: stirring the solution containing the chlorinated carbon nanotubes for 5-60 minutes, and then ultrasonicating for 20-60 minutes.

[0032] The present invention also provides a method for preparing the chlorinated carbon nanotube-based conductive elastomer as described above, which comprises the following steps: pouring the silica gel on the surface of the chlorinated carbon nanotube self-supporting film, and heating and curing it at 60-120° C. for 60-240 minutes.

[0033] In the present invention, the silicone rubber can be a conventional two-component silicone rubber in the art. The A and B components of the silicone rubber are generally flowable liquids; the components of the A component are mainly catalysts (such as platinum catalysts) and vinyl silicone oligomers, and the components of the B component are mainly crosslinking agents and vinyl silicone oligomers; the two components need to be heated and cured after mixing; the mass ratio of the A component to the B component is, for example, 1:1.

[0034] In the present invention, according to the common practice in the art, the silica gel generally needs to be vacuumed to remove bubbles before use.

[0035] In the present invention, according to the convention in the art, the pouring is generally performed in a mold.

[0036] In the present invention, the amount of silica gel used can be conventional in the art, generally on the basis of completely covering the chlorinated carbon nanotube self-supporting film and making it fully infiltrated, a blank silica gel layer with a thickness of 0.1-2 mm is reserved on the surface of the chlorinated carbon nanotube self-supporting film as a structural support layer. The pouring time can be 15-40 minutes. During the pouring process, the silica gel will continuously penetrate and embed into the gaps of the conductive network of the chlorinated carbon nanotube self-supporting film. After the chlorinated carbon nanotube self-supporting film is fully infiltrated, the silica gel will no longer penetrate, but cover the surface of the chlorinated carbon nanotube self-supporting film to form a layer of structural support silica gel layer.

[0037] In the present invention, after the pouring is completed, according to the conventional practice in the art, it is generally necessary to stand at room temperature for 6-20 hours.

[0038] In the present invention, the temperature of the heating and curing is preferably 70-100°C, such as 80°C.

[0039] In the present invention, the heating and curing time is preferably 60-150 minutes, for example, curing for 120 minutes.

[0040] The present invention also provides an application of the chlorinated carbon nanotube-based conductive elastomer as described above in the field of flexible electronics.

[0041] In the present invention, the flexible electronics are preferably stretchable electrodes, flexible sensors or electrophysiological sensors.

[0042] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0043] The reagents and raw materials used in the present invention are commercially available.

[0044] The positive and progressive effects of the present invention are:

[0045] (1) The chlorinated carbon nanotubes prepared by the present invention enhance the interface interaction between the carbon nanotubes and the silicone rubber through chlorine doping, improve the adhesion between the two, and enhance the mechanical properties of the composite material;

[0046] (2) The chlorinated carbon nanotubes prepared by the present invention can be more evenly dispersed in the silicone rubber matrix, ensuring the uniformity of the conductive properties and mechanical properties;

[0047] (3) The chlorinated carbon nanotube-based conductive elastomer prepared by the present invention has both high conductivity and original elasticity of silicone rubber, thus resolving the contradiction between conductivity and elasticity in the traditional solution;

[0048] (4) The chlorinated carbon nanotube-based conductive elastomer prepared by the present invention is suitable for a variety of flexible electronic applications, expanding the application scope in the fields of wearable devices, medical devices, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is the SEM image of the chlorinated carbon nanotube material prepared in Example 1.

[0050] Figure 2 This is the TEM image of the chlorinated carbon nanotube material prepared in Example 1.

[0051] Figure 3 This is the EDS image of the chlorinated carbon nanotube material prepared in Example 1.

[0052] Figure 4 This is the XPS graph of the chlorinated carbon nanotube material prepared in Example 1.

[0053] Figure 5 The resistance change-strain curves of the chlorinated carbon nanotube-based conductive elastomer composite material prepared in Example 1 and the carbon nanotube-based conductive elastomer composite material prepared in Comparative Example 1 as stretched electrodes.

[0054] Figure 6 The resistance change of the chlorinated carbon nanotube-based conductive elastomer composite material prepared in Example 1 under different strain states.

[0055] Figure 7 The chlorinated carbon nanotube-based conductive elastomer composite material prepared in Example 1 is used for accurate recognition of different bending angles of human fingers.

[0056] Figure 8 The chlorinated carbon nanotube-based conductive elastomer prepared in Example 1 is used for accurate monitoring of the weak pulse of the human body. DETAILED DESCRIPTION

[0057] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples. The experimental methods in the following examples without specifying specific conditions are carried out according to conventional methods and conditions, or selected according to the product specifications.

[0058] The raw material information used in the following examples and comparative examples is shown in Table 1:

[0059] Table 1

[0060]

[0061] Example 1

[0062] (1) Synthesis of chlorinated carbon nanotube materials: Weigh 0.5g PVC and 0.5g commercial multi-walled carbon nanotubes into a crucible, grind them evenly, and place them in a quartz tube with a diameter of 1cm. After evacuating the tube, seal the tube with a hydrogen-oxygen flame gun. Then heat the tube to 500℃ in a muffle furnace at a heating rate of 2℃ / min and keep it warm for 3h. Then stop heating and cool it naturally to room temperature in the furnace. After taking it out, wash it with water and ethanol three times respectively, and dry it to obtain chlorinated carbon nanotubes.

[0063] (2) Chlorinated carbon nanotube self-supporting film: 0.02 g of the chlorinated carbon nanotubes obtained in step (1) was dispersed in 40 mL of ethanol, stirred at 300 r / min for 20 min, and then ultrasonicated for 30 min to further disperse them. The uniform dispersion was assembled into a conductive film by suction filtration with a film thickness of 100 μm.

[0064] (3) Preparation of chlorinated carbon nanotube-based conductive elastomer: The chlorinated carbon nanotube self-supporting film obtained in step (2) is placed in a mold of suitable size, and the A and B components of the silica gel are weighed and mixed in a mass ratio of 1:1 and the bubbles are removed by vacuum. The silica gel is poured on the surface of the chlorinated carbon nanotube conductive film. The silica gel will partially penetrate and embed into the gaps in the chlorinated carbon nanotube conductive network. After sufficient infiltration, the thickness of the blank silica gel layer covering the surface of the chlorinated carbon nanotube conductive film is 1 mm. After standing for 12 hours, it is heated and cured at 80°C for 2 hours to obtain a chlorinated carbon nanotube-based conductive elastomer.

[0065] Example 2

[0066] Compared with Example 1, except that PVC in step (1) is replaced by PVDC, the other operations and conditions are the same as those in Example 1.

[0067] Example 3

[0068] Compared with Example 1, except that PVC in step (1) is replaced by hexachlorobenzene, the other operations and conditions are the same as those in Example 1.

[0069] Example 4

[0070] Compared with Example 1, except for weighing 0.7 g of commercial multi-walled carbon nanotubes and 0.3 g of PVC in step (1), the other operations and conditions are the same as those in Example 1.

[0071] Example 5

[0072] Compared with Example 1, except for weighing 0.4 g of commercial multi-walled carbon nanotubes and 0.6 g of PVC in step (1), the other operations and conditions are the same as those in Example 1.

[0073] Example 6

[0074] Compared with Example 1, except for weighing 0.3 g of commercial multi-walled carbon nanotubes and 0.7 g of PVC in step (1), the other operations and conditions are the same as those in Example 1.

[0075] Example 7

[0076] Compared with Example 1, except that the calcination temperature in step (1) is adjusted to 400° C., the other operations and conditions are the same as those in Example 1.

[0077] Example 8

[0078] Compared with Example 1, except that the calcination temperature in step (1) is adjusted to 600° C., the other operations and conditions are the same as those in Example 1.

[0079] Comparative Example 1

[0080] Preparation of commercial carbon nanotube-based conductive elastomer: 0.02 g of multi-walled carbon nanotubes were dispersed in 40 mL of ethanol, stirred at 300 r / min for 20 min, and then ultrasonicated for 30 min to further disperse them. The uniform dispersion was assembled into a carbon nanotube conductive film by suction filtration.

[0081] The carbon nanotube conductive film is placed in a mold of appropriate size, and the A and B components of the silicone rubber are weighed and mixed in a 1:1 ratio and the bubbles are removed by vacuum. The silicone rubber is poured on the surface of the carbon nanotube conductive film. The silicone rubber will be partially embedded in the gaps of the carbon nanotube conductive network. After sufficient infiltration, the thickness of the structural support silicone rubber layer covering the surface of the carbon nanotube conductive film is 1 mm. After standing for 12 hours, it is heated and cured at 100°C for 2 hours, and then the filter membrane is removed to obtain a carbon nanotube-based conductive elastomer.

[0082] Effect Example

[0083] (1) Morphological characterization

[0084] The SEM image of the chlorinated carbon nanotube material prepared in Example 1 is as follows: Figure 1 As shown, the TEM images of the chlorinated carbon nanotube material prepared in Example 1 are as follows: Figure 2 shown.

[0085] according to Figure 1It can be seen that the chlorinated carbon nanotubes prepared with PVC powder as the Cl-based precursor still maintain a one-dimensional linear structure, which is basically consistent with the original carbon nanotubes. It can be seen from the TEM image that the prepared chlorinated carbon nanotubes present an obvious tubular structure, indicating that the chlorination process does not cause obvious damage to the tubular structure of the carbon nanotubes. However, it can be seen from the TEM image that there is obvious structural damage and stacking in the wall layer of the carbon nanotubes. This is mainly because the chlorine atoms doped into the middle of the carbon lattice destroy the original lattice structure, thereby increasing the disorder of the atomic arrangement of the tube wall.

[0086] (2) Analysis of chlorine doping

[0087] The chlorinated carbon nanotube material prepared in Example 1 was characterized by EDS. Figure 3 As shown in the figure, it can be seen that there is an obvious chlorine peak in the prepared chlorinated carbon nanotube material, indicating that after the chlorination process, the Cl element is grafted onto the surface of the carbon nanotube. Figure 4 From the XPS data of the chlorinated carbon nanotube material prepared in Example 1, it can be seen that the chlorine atom forms a Cl-C covalent bond with the carbon, which fully demonstrates that the Cl element is connected to the carbon atom in the form of a covalent bond, rather than just adsorbed on the carbon surface.

[0088] EDS analysis was performed on the chlorinated carbon nanotubes prepared in Example 1 and Examples 4-8, as shown in Table 1:

[0089] Table 2 Atomic fraction and mass fraction of chlorine atoms doped in chlorinated carbon nanotubes

[0090] serial number Atomic fraction (%) Mass fraction (%) Example 1 0.87 2.53 Example 4 0.21 0.60 Example 5 0.43 1.26 Example 6 0.25 0.73 Example 7 0.51 1.48 Example 8 0.76 2.22

[0091] (3) Chlorinated carbon nanotube-based conductive elastomer composites are applied in stretchable electrode testing.

[0092] The chlorinated carbon nanotube-based conductive elastomer prepared in Example 1 and the carbon nanotube-based conductive elastomer prepared in Comparative Example 1 were respectively used as stretchable mechanical sensors for strain-electrical performance testing: both ends of the chlorinated carbon nanotube-based conductive elastomer composite material were fixed in a stretching fixture, and liquid metal was used as the lead-out electrode to connect to the copper foil, and an electrochemical workstation was used as a signal acquisition device to collect and record real-time electrical signals.

[0093] The test results are shown in Figure 5. The resistance of the carbon nanotube-based conductive elastomer increases rapidly during the stretching process. This is mainly because the interface bonding strength between the carbon nanotubes and the silicone is low, and the interface slip generated during the stretching process seriously affects the entire conductive network. The resistance of the chlorinated carbon nanotube-based conductive elastomer changes more slowly during the stretching process. Under a tensile strain of 900%, the resistance change rate does not exceed 100 times. Therefore, compared with the nanotube-based conductive elastomer composite material, the chlorinated carbon nanotube-based conductive elastomer composite material has better tensile electrical properties.

[0094] In addition, the chlorinated carbon nanotube-based conductive elastomer composites were subjected to cyclic tests under different strain states. Figure 6 As shown, the prepared chlorinated carbon nanotube-based conductive elastomer composite material has obvious response characteristics to different tensile strains and remains stable after multiple cycles.

[0095] (4) Application of chlorinated carbon nanotube-based conductive elastomer composites in body surface mechanical signal testing

[0096] The chlorinated carbon nanotube-based conductive elastomer composite material prepared in Example 1 was attached to the fingers and wrists, and the finger bending and pulse beat were monitored using an electrochemical workstation. The results were as follows: Figure 7 and Figure 8 As shown in the figure, at different bending angles of the finger, the resistance of the chlorinated carbon nanotube-based conductive elastomer composite material shows a significant correlation with the bending angle of the finger, and the pulse signal of the human body can be clearly monitored when it is attached to the wrist.

[0097] According to the above experimental results, the chlorinated carbon nanotube-based conductive elastomer material prepared in the present invention can be applied to flexible stretchable electrodes, and can accurately monitor mechanical signals on the human body surface, including finger bending, pulse, etc.

[0098] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A method for preparing chlorinated carbon nanotubes, characterized in that: It includes the following steps: A mixture of carbon nanotubes and a chlorine source precursor is placed in a reaction tube, and the reaction tube is vacuum-sealed and calcined at 400-900° C. for 2-5 hours to obtain the chlorinated carbon nanotubes; the mass ratio of the carbon nanotubes to the chlorine source precursor is 1:(0.4-2.3); the chlorine source precursor is one or more of hexachlorobenzene, PVC and PVDC.

2. The method for preparing chlorinated carbon nanotubes according to claim 1, characterized in that: The preparation method meets one or more of the following conditions: (1) The diameter of the carbon nanotube is 5-20 nm; (2) The length of the carbon nanotubes is 20-55 μm; (3) The mass ratio of the carbon nanotubes to the chlorine source precursor is 1:0.43, 1:0.5, 1:0.67, 1:1, 1:1.1, 1:1.5 or 1:2.

3.

3. The method for preparing chlorinated carbon nanotubes according to claim 2, characterized in that: The diameter of the carbon nanotube is 8-15 nm.

4. The method for preparing chlorinated carbon nanotubes according to claim 2, characterized in that: The length of the carbon nanotubes is 45-55 μm.

5. The method for preparing chlorinated carbon nanotubes according to claim 1, characterized in that: The mass ratio of the carbon nanotubes to the chlorine source precursor is 1:(0.9-1.1).

6. The method for preparing chlorinated carbon nanotubes according to claim 1, characterized in that: The preparation method meets one or more of the following conditions: (1) The method for preparing the mixture of carbon nanotubes and chlorine source precursor comprises the following steps: grinding the carbon nanotubes and chlorine source precursor uniformly; (2) The calcination temperature is 400°C, 450°C, 500°C or 600°C; (3) The calcination time is 2-4 hours; (4) After the calcination, washing and drying are required.

7. The method for preparing chlorinated carbon nanotubes according to claim 1, characterized in that: The calcination temperature is 500-600°C.

8. The method for preparing chlorinated carbon nanotubes according to claim 6, characterized in that: The washing is performed using water and / or ethanol.

9. A chlorinated carbon nanotube, characterized in that: It is prepared according to the preparation method described in any one of claims 1 to 8.

10. A chlorinated carbon nanotube-based conductive elastomer, comprising a chlorinated carbon nanotube self-supporting film and silica gel, wherein the chlorinated carbon nanotube self-supporting film is made from the chlorinated carbon nanotube according to claim 9.

11. The chlorinated carbon nanotube-based conductive elastomer according to claim 10, characterized in that: The chlorinated carbon nanotube-based conductive elastomer meets one or more of the following conditions: (1) The thickness of the chlorinated carbon nanotube self-supporting film is 20-200 μm; (2) The surface loading of the chlorinated carbon nanotube self-supporting film is 0.5 mg / cm 2 -2 mg / cm 2 ; (3) The silicone is one or more of Dragon Skin silicone, Ecoflex and PDMS; (4) The thickness of the silica gel covering the surface of the chlorinated carbon nanotube self-supporting film is 0.1-2 mm.

12. The chlorinated carbon nanotube-based conductive elastomer according to claim 10, characterized in that: The method for preparing the chlorinated carbon nanotube self-supporting film comprises the following steps: uniformly dispersing the solution containing the chlorinated carbon nanotubes, and then filtering.

13. The chlorinated carbon nanotube-based conductive elastomer according to claim 12, characterized in that: In the solution of chlorinated carbon nanotubes, the solvent is one or more of ethanol, deionized water, NMP and DMF.

14. The chlorinated carbon nanotube-based conductive elastomer according to claim 12, characterized in that: The concentration of the chlorinated carbon nanotube solution is 0.2-20 mg / mL.

15. The chlorinated carbon nanotube-based conductive elastomer according to claim 12, characterized in that: The dispersion method is mechanical stirring, ultrasound or ball milling.

16. A method for preparing a chlorinated carbon nanotube-based conductive elastomer as claimed in any one of claims 10 to 15, comprising the following steps: pouring the silica gel on the surface of the chlorinated carbon nanotube self-supporting film, and heating and curing it at 60-120°C for 60-240 minutes.

17. The method for preparing a chlorinated carbon nanotube-based conductive elastomer according to claim 16, characterized in that: The temperature of the heating curing is 70-100°C; And / or, the heating and curing time is 60-150 minutes.

18. Use of the chlorinated carbon nanotube-based conductive elastomer according to any one of claims 10 to 15 in the field of flexible electronics; The flexible electronics are preferably stretchable electrodes, flexible sensors or electrophysiological sensors.

19. Use of the chlorinated carbon nanotube-based conductive elastomer according to claim 18 in the field of flexible electronics, characterized in that: The flexible electronics are stretchable electrodes, flexible sensors or electrophysiological sensors.

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