Stretchable conductive ink based on alkylated carbon nanotube robust conductive network as well as preparation method and application of stretchable conductive ink
By using a hybrid network formed by alkylated carbon nanotubes and sheet-like silver powder, the problems of conductivity stability and cost of stretchable conductive inks have been solved, achieving the preparation of conductive inks with high conductivity and low cost, which are suitable for the field of flexible electronics.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SOUTH CHINA UNIV OF TECH
- Filing Date
- 2026-03-25
- Publication Date
- 2026-05-19
AI Technical Summary
Existing stretchable conductive inks suffer from poor physical stretchability and high manufacturing costs due to the reliance on high fillers for high conductivity, and also lack sufficient conductive stability.
A robust conductive network of alkylated carbon nanotubes was developed by combining alkylated carbon nanotubes with flake silver powder to form a hybrid network, thereby reducing the content of conductive fillers and improving dispersibility and slippage ability, thus preparing a stretchable conductive ink.
It achieves high conductivity and electrical stability with low conductive filler content, reduces production costs, and has adjustable viscosity and shear thinning characteristics, making it suitable for a variety of patterning schemes.
Smart Images
Figure CN122060360A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of conductive inks, specifically relating to a stretchable conductive ink based on a robust conductive network of alkylated carbon nanotubes, its preparation method, and its application. Background Technology
[0002] With the rapid development of flexible electronics, wearable devices, health monitoring sensors, and soft robots, the demand for stretchable circuits that combine excellent conductivity with mechanical flexibility is becoming increasingly urgent. Stretchable circuits need to withstand complex deformations such as stretching, bending, and twisting while maintaining stable conductivity. Stretchable circuit structures, such as serpentine or paper-cut shapes, can impart some stretchability to the circuit, but the effect is limited and does not address the intrinsic stretchability of the conductor. Liquid metal, as an intrinsically stretchable conductor, has good conductivity stability, but due to its physical state, it is prone to leakage and alloying with the metal leads of electronic components. Stretchable conductive inks achieve conductivity stability by relying on the stretchable polymer's encapsulation and protection of conductive fillers, and the sliding and alignment of the conductive fillers during stretching. Furthermore, stretchable conductive inks can be patterned into desired circuits through additive manufacturing methods such as printing or lithography, which not only reduces production costs and improves production efficiency but also allows for rapid circuit customization, making it considered the most promising solution for achieving large-area, low-cost stretchable circuits. Stretchable conductive inks are mainly composed of stretchable polymer elastomers and conductive fillers. A qualified stretchable conductive ink should possess good tensile electrical stability and high conductivity. Generally, reducing internal friction between conductive fillers and protecting them with the polymer can improve tensile electrical stability. Among conductive fillers, precious metals such as silver and gold, due to their excellent electrical properties, can ensure the conductivity of the conductive ink. Increasing their content can further improve conductivity. However, with the increase of conductive fillers, a large number of stress concentration points will be created, leading to physical cracking of the ink during stretching, thus compromising the conductive stability of the ink during stretching.
[0003] Therefore, preparing a stretchable conductive ink with high conductivity and conductive stability at a low conductive filler content not only reduces the manufacturing cost of stretchable conductive ink, but also lays the foundation for the development of flexible and stretchable electronics. Summary of the Invention
[0004] To address the shortcomings and deficiencies of existing technologies, the primary objective of this invention is to provide a stretchable conductive ink based on a robust conductive network of alkylated carbon nanotubes. This addresses the problems of poor physical stretchability and high manufacturing costs caused by high filler content in existing technologies, and further improves the conductive stretchability.
[0005] Another object of the present invention is to provide a method for preparing the above-mentioned stretchable conductive ink based on a robust conductive network of alkylated carbon nanotubes.
[0006] Another object of the present invention is to provide an application of the above-mentioned stretchable conductive ink based on a robust conductive network of alkylated carbon nanotubes.
[0007] To achieve this objective, the present invention adopts the following technical solution:
[0008] In a first aspect, the present invention provides a stretchable conductive ink based on a robust conductive network of alkylated carbon nanotubes, comprising the following components by weight:
[0009] 30–170 parts of alkylated carbon nanotube dispersion, 20–90 parts of flake silver powder, and 100–200 parts of stretchable organic carrier solution.
[0010] Preferably, the concentration of the alkylated carbon nanotube dispersion is 0.25–2 wt%.
[0011] Preferably, the solvent of the alkylated carbon nanotube dispersion includes at least one selected from N,N-dimethylformamide, dimethyl sulfoxide, tetrahydrofuran, toluene, xylene, cyclohexane, dichloromethane, and trichloromethane.
[0012] Preferably, in the alkylated carbon nanotube dispersion, the alkylated carbon nanotubes are obtained by reacting hydroxylated carbon nanotubes and silane coupling agent at a mass ratio of (1-3):(3-15).
[0013] More preferably, the silane coupling agent includes at least one selected from butyltrimethoxysilane, hexyltrimethoxysilane, octyltrimethoxysilane, n-decyltrimethoxysilane, dodecyltrimethoxysilane, butyltriethoxysilane, hexyltriethoxysilane, octyltriethoxysilane, n-decyltriethoxysilane, and dodecyltriethoxysilane.
[0014] More preferably, the hydroxylated carbon nanotubes have an oxygen content of 0.8–7 wt%, a diameter of 5–15 nm, and a length of 10–30 μm.
[0015] More preferably, the alkylated carbon nanotubes in the alkylated carbon nanotube dispersion are obtained by the following method:
[0016] Adjust the pH of the ethanol solution to 4-5, disperse the hydroxylated carbon nanotubes in it, add a silane coupling agent dropwise, stir the reaction, dry, wash, and dry again to obtain alkylated carbon nanotubes.
[0017] More preferably, the volume concentration of the ethanol solution is 80-95%.
[0018] More preferably, the pH of the ethanol solution is adjusted to 4-5 using glacial acetic acid.
[0019] More preferably, the concentration of the hydroxylated carbon nanotubes in an ethanol solution with a pH of 4 to 5 is 1 to 3 mg / mL.
[0020] More preferably, the stirring reaction time is 0.3 to 1 hour, and most preferably 0.5 hours.
[0021] More preferably, the drying temperature is 60-80 °C and the drying time is 8-12 hours.
[0022] More preferably, the washing refers to washing with anhydrous ethanol.
[0023] Preferably, the flake silver powder is micron-sized flake silver powder with a particle size range of 5–9 μm.
[0024] Preferably, the concentration of the stretchable organic carrier solution is 15–30 wt%.
[0025] Preferably, the solvent of the stretchable organic carrier solution includes at least one selected from N,N-dimethylformamide, dimethyl sulfoxide, tetrahydrofuran, toluene, xylene, cyclohexane, dichloromethane, and trichloromethane.
[0026] Preferably, in the stretchable organic carrier solution, the stretchable organic carrier is a thermoplastic elastomer, including at least one of thermoplastic polyurethane, styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, and hydrogenated styrene-butadiene-styrene block copolymer.
[0027] Preferably, the stretchable organic carrier solution is prepared by the following method:
[0028] The thermoplastic elastomer and organic solvent are placed in a water bath at 70–85 °C and stirred at 200–500 r / min for 0.5–2.5 h until the elastomer is completely dissolved. After dissolution, the mixture is cooled to room temperature to obtain a stretchable organic carrier solution.
[0029] Preferably, the stretchable conductive ink based on the robust conductive network of alkylated carbon nanotubes further includes the following components by mass: 0.1 to 0.25 parts of leveling agent.
[0030] More preferably, the leveling agent includes at least one of BYK-358, BYK-381, BYK-333, EFKA-3030, EFKA-3031, TEGO-245, DC-57, DC-193, X-630, B-202, CM-6358N, and HY-6102.
[0031] Preferably, the stretchable conductive ink based on the robust conductive network of alkylated carbon nanotubes further includes the following components by mass: 0.2 to 0.5 parts of defoamer.
[0032] More preferably, the defoamer includes at least one of BYK-052, BYK-057, BYK-065, BYK-066N, TEGO Glide410, EFKA-2500, TEGO Foamex 10, DF-103, and DF-105.
[0033] Preferably, the stretchable conductive ink based on a robust conductive network of alkylated carbon nanotubes comprises the following components by weight:
[0034] 100 parts of alkylated carbon nanotube dispersion, 36.25-57.08 parts of flake silver powder, 100 parts of stretchable organic carrier solution, 0.25 parts of leveling agent, and 0.5 parts of defoamer;
[0035] The concentration of the alkylated carbon nanotube dispersion was 1.25 wt%; the concentration of the stretchable organic carrier solution was 25 wt%.
[0036] Secondly, the present invention provides a method for preparing the above-mentioned stretchable conductive ink based on a robust conductive network of alkylated carbon nanotubes, comprising the following steps:
[0037] Mix all components thoroughly to obtain a stretchable conductive ink.
[0038] The mixing temperature is room temperature, and the time is 4 to 8 hours.
[0039] Thirdly, the present invention provides an application of the above-mentioned stretchable conductive ink based on a robust conductive network of alkylated carbon nanotubes.
[0040] Preferably, it is used in the field of flexible electronics.
[0041] Compared with the prior art, the present invention has the following advantages and beneficial effects:
[0042] This invention designs a robust conductive network using alkylated carbon nanotubes and applies it to conductive inks. On one hand, alkylated carbon nanotubes can improve the dispersibility of conductive fillers, thereby enabling the conductive ink to have higher conductivity with less conductive filler content. This not only reduces the amount of conductive filler used, thus lowering the cost of using conductive fillers, but also allows alkylated carbon nanotubes to act as a lubricant, promoting the slippage of the conductive network during the stretching process, thereby improving the conductive stability of the conductive ink. The prepared conductive ink also has adjustable viscosity and shear thinning properties, making it suitable for various patterning schemes. Attached Figure Description
[0043] Figure 1 These are TEM images of hydroxylated carbon nanotubes and synthesized alkylated carbon nanotubes in Example 1 of this invention.
[0044] Figure 2 The thermogravimetric curves of hydroxylated carbon nanotubes and synthesized alkylated carbon nanotubes in Example 1 of this invention are shown.
[0045] Figure 3 The images show the energy dispersive spectroscopy (EDS) and SEM images of silver elements in the conductive films obtained by drying the stretchable conductive ink at 110 °C for 1 h in Examples 1 and 1 of this invention.
[0046] Figure 4 The diagram shows the conductive ink (A), the circuit obtained by patterning the conductive ink (B), and the conductive display diagram of the circuit under stretching (C) in Embodiment 1 of the present invention.
[0047] Figure 5 In Figure A, the conductive ink obtained in Embodiment 1 of the present invention is used to print a star-shaped circuit by inkjet printing using method 1. In Figure B, the conductive ink obtained in Embodiment 1 of the present invention is used to print interdigitated electrodes by screen printing using method 2. Detailed Implementation
[0048] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.
[0049] Unless otherwise specified in the embodiments of this invention, the conditions shall be performed according to conventional conditions or conditions recommended by the manufacturer. All raw materials and reagents used, unless otherwise specified, are commercially available conventional products.
[0050] Example 1
[0051] The stretchable conductive ink of this embodiment comprises, by weight, the following raw materials: 100 parts of alkylated carbon nanotube dispersion, 57.08 parts of flake silver powder, 100 parts of stretchable organic carrier solution, 0.25 parts of BYK-333 leveling agent, and 0.5 parts of BYK-066N defoamer. Excluding the solvent, the total mass fraction of alkylated carbon nanotubes and flake silver powder is 70 wt%.
[0052] The alkylated carbon nanotube dispersion was prepared by the following steps:
[0053] Step 1: Adjust the pH of 250 mL of 95% ethanol solution to 4.75 with glacial acetic acid, and then disperse 0.4 g of hydroxylated carbon nanotubes (manufacturer: Chengdu Jiacai Technology Co., Ltd., brand name: JCMWCH2) in it;
[0054] Step 2: Slowly add 1 mL of octyltriethoxysilane dropwise to the hydroxylated carbon nanotube dispersion described in Step 1 while stirring vigorously. After the addition is complete, stir mechanically for 0.5 h.
[0055] Step 3: The dispersion was dried at 60 °C for 10 h to obtain alkylated carbon nanotubes, which were then washed three times in anhydrous ethanol. After washing, the ethanol was dried at 60 °C. The alkylated carbon nanotubes were then ground for later use. Figure 1 The TEM image shows that an alkyl layer appeared on the surface of the modified alkylated carbon nanotubes. Figure 2 The thermogravimetric analysis shows that the alkylated carbon nanotubes exhibit two weight loss steps. The weight loss step at 330–450 °C belongs to the alkyl layer, thus confirming the successful synthesis of the alkylated carbon nanotubes.
[0056] Step 4: Disperse alkylated carbon nanotubes in N,N-dimethylformamide and adjust the concentration to 1.25 wt% to obtain an alkylated carbon nanotube dispersion;
[0057] The flake-shaped silver powder is micron-sized silver powder with an average particle size of 5.4 μm;
[0058] The method for preparing the stretchable organic carrier solution is as follows: thermoplastic polyurethane granules and N,N-dimethylformamide are mixed at a mass ratio of 25:75 and stirred in a water bath at 70 °C with a stirring rate of 300 rpm for 1.5 h to obtain a homogeneous stretchable organic carrier solution, which is then cooled at room temperature.
[0059] A method for preparing a stretchable conductive ink, comprising the following steps:
[0060] After mixing the alkylated carbon nanotube dispersion, stretchable organic carrier solution, leveling agent and defoamer in a certain proportion and stirring evenly, the flake silver powder is added in small amounts and multiple times in steps, and mixed evenly by stirring. After the addition is complete, the mixture is stirred at room temperature for 10 hours to obtain stretchable conductive ink.
[0061] Example 2
[0062] The stretchable conductive ink of this embodiment comprises, by weight, the following raw materials: 100 parts alkylated carbon nanotube dispersion, 36.25 parts flake silver powder, 100 parts stretchable organic carrier solution, 0.25 parts BYK-333 leveling agent, and 0.5 parts BY-K066N defoamer. Excluding the solvent, the total mass fraction of alkylated carbon nanotubes and flake silver powder is 60 wt%.
[0063] The alkylated carbon nanotube dispersion was prepared by the following steps:
[0064] Step 1: Adjust the pH of 250 mL of 95% ethanol solution to 4.25 with glacial acetic acid, and then disperse 0.4 g of hydroxylated carbon nanotubes (manufacturer: Chengdu Jiacai Technology Co., Ltd., brand name: JCMWCH2) in it;
[0065] Step 2: Slowly add 1 mL of hexyltriethoxysilane dropwise to the hydroxylated carbon nanotube dispersion described in Step 1 while stirring vigorously. After the addition is complete, stir mechanically for 0.5 h.
[0066] Step 3: Dry the dispersion at 60 °C for 10 h to obtain alkylated carbon nanotubes, wash them three times in anhydrous ethanol, dry the ethanol at 60 °C after washing, and grind the alkylated carbon nanotubes for later use.
[0067] Step 4: Disperse alkylated carbon nanotubes in N,N-dimethylformamide and adjust the concentration to 1.25 wt% to obtain an alkylated carbon nanotube dispersion;
[0068] The flake-shaped silver powder is micron-sized silver powder with an average particle size of 5.4 μm;
[0069] The method for preparing the stretchable organic carrier solution is as follows: thermoplastic polyurethane granules and N,N-dimethylformamide are mixed at a mass ratio of 25:75 and stirred in a water bath at 70 °C with a stirring rate of 300 rpm for 1.5 h to obtain a homogeneous stretchable organic carrier solution, which is then cooled at room temperature.
[0070] A method for preparing a stretchable conductive ink, comprising the following steps:
[0071] After mixing the alkylated carbon nanotube dispersion, stretchable organic carrier solution, leveling agent and defoamer in a certain proportion and stirring evenly, the flake silver powder is added in small amounts and multiple times in steps, and mixed evenly by stirring. After the addition is complete, the mixture is stirred at room temperature for 10 hours to obtain stretchable conductive ink.
[0072] Comparative Example 1
[0073] Compared with Example 1, Comparative Example 1 did not use alkylated carbon nanotube dispersion, the amount of flake silver powder added was 58.33 parts, and the mass fraction of solvent removed was 70 wt%.
[0074] Comparative Example 2
[0075] Compared with Example 2, Comparative Example 2 did not use alkylated carbon nanotube dispersion, the amount of flake silver powder added was 37.5 parts, and the mass fraction of solvent removed was 60 wt%.
[0076] Comparative Example 3
[0077] Compared with Example 1, Comparative Example 3 uses a dispersion of hydroxylated carbon nanotubes (manufacturer: Chengdu Jiacai Technology Co., Ltd., brand name: JCMWCH2). After removing the solvent, the total mass fraction of hydroxylated carbon nanotubes and flake silver powder is 70 wt%.
[0078] Comparative Example 4
[0079] Compared with Example 1, Comparative Example 4 uses a carbon nanotube dispersion with a diameter of 5-15 nm and a length of 10-30 μm (manufacturer: Chengdu Jiacai Technology Co., Ltd., brand name: JCMWC2). After removing the solvent, the total mass fraction of carbon nanotubes and flake silver powder is 70 wt%.
[0080] Performance testing:
[0081] The stretchable conductive ink samples prepared in Examples 1, 2 and Comparative Examples 1 to 4 were leveled on a release film and dried at 110°C for one hour to prepare conductive films with a thickness of 0.03 to 0.05 mm. The conductivity and stretchability of the films were then tested, and the results are shown in Table 1 below.
[0082] The following are application methods for stretchable conductive inks:
[0083] Method 1: Inkjet printing using an inkjet printer: needle diameter 260 μm, printing speed 5 mm / s, printing air pressure 2 kPa, printing according to the preset pattern, and drying in an oven at 110 ℃ for 1 h after printing to obtain the circuit.
[0084] Method 2: Screen printing: Clean the squeegee and screen, pour conductive ink onto the screen, and use the squeegee to quickly and evenly cover the conductive ink onto the screen pattern. After completion, dry in an oven at 110 ℃ for 1 hour to obtain the electrode.
[0085] Table 1 Performance Test Results
[0086]
[0087] The test results in Table 1 show that the stretchable conductive inks of Examples 1 and 2 exhibit excellent initial and stretched conductivity. This is because the hybrid network formed by alkylated carbon nanotubes and sheet-like silver powder has a higher initial conductivity but a lower conductive filler content compared to the pure silver conductive network: Example 2 has a total carbon-silver conductive filler content of 60 wt% and an initial conductivity of 1126.26 S / cm; Comparative Example 2 has a silver conductive filler content of 60 wt% and an initial conductivity of only 30.05 S / cm; and Comparative Example 1 has a silver conductive filler content of 70 wt% and an initial conductivity of only 455.76 S / cm. Although the hybrid network formed by alkylated carbon nanotubes and sheet-like silver powder has a slightly lower electrical conductivity than the hybrid network formed by hydroxylated carbon nanotubes and sheet-like silver powder, it has a higher electrical conductivity and a higher physical elongation under the same strain: Example 1: initial electrical conductivity 3349.78 S / cm, electrical conductivity at 50% stretch 378.53 S / cm, electrical conductivity at 100% stretch 35.21 S / cm, physical elongation 305%; Comparative Example 3: initial electrical conductivity 3629.54 S / cm, electrical conductivity at 50% stretch 102.49 S / cm, electrical conductivity at 100% stretch 2.43 S / cm, physical elongation 150%. The hybrid network formed by alkylated carbon nanotubes and sheet-like silver powder has higher electrical conductivity than the hybrid network formed by alkylated carbon nanotubes and sheet-like silver powder. Under the same strain, the electrical conductivity is higher and the physical elongation is higher: Example 1: initial electrical conductivity 3349.78 S / cm, electrical conductivity at 50% stretch 378.53 S / cm, electrical conductivity at 100% stretch 35.21 S / cm, physical elongation 305%; Comparative Example 4: initial electrical conductivity 2855.82, electrical conductivity at 50% stretch 73.54 S / cm, physical elongation 70%.
[0088] This invention introduces alkyl chains onto the surface of carbon nanotubes by hydrolyzing siloxanes to form silanols, which are then dehydrated and covalently bonded to the hydroxyl groups on the surface of hydroxylated carbon nanotubes. On the one hand, alkylated carbon nanotubes can improve the dispersibility of conductive fillers, such as... Figure 3 As shown, the introduction of alkylated carbon nanotubes into the conductive network enables more uniform dispersion of the conductive silver flakes, thereby allowing the conductive ink to achieve higher conductivity with less conductive filler content. This not only reduces the amount of conductive filler used and lowers the cost, but also, alkylated carbon nanotubes act as a lubricant, promoting the slippage of the conductive network during stretching, thus improving the conductive stability of the conductive ink. Figure 4 As shown, conductive ink ( Figure 4 The circuit obtained by patterning (A) in ( ) Figure 4 (B) of the middle part has good tensile conductivity. Figure 4 (C) in the middle.
[0089] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.
Claims
1. A stretchable conductive ink based on a robust conductive network of alkylated carbon nanotubes, characterized in that, By mass, it includes the following components: 30–170 parts of alkylated carbon nanotube dispersion, 20–90 parts of flake silver powder, and 100–200 parts of stretchable organic carrier solution.
2. The stretchable conductive ink according to claim 1, characterized in that, The concentration of the alkylated carbon nanotube dispersion is 0.25–2 wt%; And / or, the concentration of the stretchable organic carrier solution is 15–30 wt%.
3. The stretchable conductive ink according to claim 1 or 2, characterized in that, In the alkylated carbon nanotube dispersion, the alkylated carbon nanotubes are obtained by reacting hydroxylated carbon nanotubes and silane coupling agents in a mass ratio of (1-3):(3-15); The silane coupling agent includes at least one of butyltrimethoxysilane, hexyltrimethoxysilane, octyltrimethoxysilane, n-decyltrimethoxysilane, dodecyltrimethoxysilane, butyltriethoxysilane, hexyltriethoxysilane, octyltriethoxysilane, n-decyltriethoxysilane, and dodecyltriethoxysilane. The hydroxylated carbon nanotubes have an oxygen content of 0.8–7 wt%, a diameter of 5–15 nm, and a length of 10–30 μm.
4. The stretchable conductive ink according to claim 3, characterized in that, The alkylated carbon nanotubes in the alkylated carbon nanotube dispersion were prepared by the following method: Adjust the pH of the ethanol solution to 4-5, disperse the hydroxylated carbon nanotubes in it, add silane coupling agent dropwise, stir the reaction, dry, wash, and dry again to obtain alkylated carbon nanotubes. The volume concentration of the ethanol solution is 80-95%; Adjust the pH of the ethanol solution to 4-5 using glacial acetic acid; The concentration of the hydroxylated carbon nanotubes in an ethanol solution with a pH of 4–5 is 1–3 mg / mL. The stirring reaction time is 0.3 to 1 hour.
5. The stretchable conductive ink according to claim 1 or 2, characterized in that, The flake-shaped silver powder is micron-sized flake-shaped silver powder with a particle size range of 5–9 μm; And / or, in the stretchable organic carrier solution, the stretchable organic carrier is a thermoplastic elastomer, including at least one of thermoplastic polyurethane, styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer and hydrogenated styrene-butadiene-styrene block copolymer; And / or, the solvent of the stretchable organic carrier solution includes at least one of N,N-dimethylformamide, dimethyl sulfoxide, tetrahydrofuran, toluene, xylene, cyclohexane, dichloromethane, and trichloromethane; And / or, the solvent of the alkylated carbon nanotube dispersion includes at least one of N,N-dimethylformamide, dimethyl sulfoxide, tetrahydrofuran, toluene, xylene, cyclohexane, dichloromethane, and chloroform.
6. The stretchable conductive ink according to claim 1 or 2, characterized in that, By weight, it also includes the following components: 0.1 to 0.25 parts of leveling agent; The leveling agent includes at least one of BYK-358, BYK-381, BYK-333, EFKA-3030, EFKA-3031, TEGO-245, DC-57, DC-193, X-630, B-202, CM-6358N, and HY-6102.
7. The stretchable conductive ink according to claim 1 or 2, characterized in that, By weight, it also includes the following components: 0.2 to 0.5 parts of defoamer; The defoamer includes at least one of BYK-052, BYK-057, BYK-065, BYK-066N, TEGO Glide 410, EFKA-2500, TEGO Foamex 10, DF-103, and DF-105.
8. The stretchable conductive ink according to claim 1 or 2, characterized in that, By mass, it includes the following components: 100 parts of alkylated carbon nanotube dispersion, 36.25-57.08 parts of flake silver powder, 100 parts of stretchable organic carrier solution, 0.25 parts of leveling agent, and 0.5 parts of defoamer; The concentration of the alkylated carbon nanotube dispersion was 1.25 wt%, and the concentration of the stretchable organic carrier solution was 25 wt%.
9. A method for preparing a stretchable conductive ink based on a robust conductive network of alkylated carbon nanotubes as described in any one of claims 1 to 8, characterized in that, Includes the following steps: Mix all components thoroughly to obtain a stretchable conductive ink.
10. The application of the stretchable conductive ink based on a robust conductive network of alkylated carbon nanotubes as described in any one of claims 1 to 8.