Carbon nanotube composite dispersants and carbon nanotube dispersions

Abstract

This invention discloses a carbon nanotube composite dispersant and a carbon nanotube dispersion. The carbon nanotube composite dispersant is composed of an anionic dispersant and a cationic dispersant, wherein the anionic dispersant is a small molecule containing an aromatic ring anion, and the cationic dispersant is a cationic water-soluble polymer. This invention also discloses a carbon nanotube dispersion obtained based on this carbon nanotube composite dispersant. This composite dispersant utilizes the strong electrostatic attraction between anions and cations, resulting in a carbon nanotube dispersion with advantages such as fewer defects, smaller particle size, and better conductivity, as well as being environmentally friendly and stable. This composite dispersant is based on common dispersants and has a significant cost advantage.

Description

Technical Field

[0001] This invention belongs to the field of polymer material preparation technology, specifically relating to a carbon nanotube composite dispersant and a carbon nanotube dispersion prepared based on the carbon nanotube composite dispersant. Background Technology

[0002] Carbon nanotubes (CNTs) are cylindrical graphene tubes with a one-dimensional π-conjugated structure. They are among the most representative high-performance nanomaterials. Due to their significant electrical, mechanical, thermal conductivity, and optical properties, CNTs have become candidate materials for various applications such as electronics, sensors, energy conversion, and storage devices.

[0003] Aqueous dispersions of CNTs offer significant advantages in terms of environmental friendliness and biocompatibility, making them suitable for specific applications such as biomaterials and waterborne coatings. Therefore, developing homogeneous CNT aqueous suspensions is crucial for exploring environmentally friendly processes for CNTs. However, the sp... 2 The high aspect ratio of the carbon nanotube skeleton, the extremely strong van der Waals forces between tubes, and its inherent hydrophobicity make it difficult to prepare stable aqueous suspensions of CNTs, which greatly hinders the further development and application of CNTs. Therefore, research on the opening and stability of carbon nanotube aggregates is of paramount importance.

[0004] Therefore, researching the preparation of excellent carbon nanotube aqueous dispersion systems is crucial. For example, Chinese patent application CN116799212A discloses a method for preparing a carbon nanotube conductive paste, which involves adding hyperbranched polymer-modified purified carbon nanotubes to a mixture using N-methylpyrrolidone as the solvent and polyvinylpyrrolidone K30 as the dispersant, followed by sand milling. However, the hyperbranched polymer-modified purified carbon nanotubes require advance preparation, are time-consuming, and involve complex processes. Furthermore, the modification of the carbon nanotubes can damage their original structure, affecting their performance. Summary of the Invention

[0005] In view of this, the present invention needs to provide a carbon nanotube composite dispersant, which is composed of anionic dispersant and cationic dispersant. By utilizing the strong electrostatic attraction between anions and cations, the carbon nanotube dispersion obtained has the advantages of fewer defects, smaller particles and better conductivity, and is also environmentally friendly and has good stability.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This invention provides a carbon nanotube composite dispersant, which is composed of anionic dispersant and cationic dispersant, wherein the anionic dispersant is an anionic small molecule containing an aromatic ring, and the cationic dispersant is a cationic water-soluble polymer.

[0008] Preferably, the molecular weight of the anionic small molecule is <500.

[0009] Preferably, the molecular weight of the cationic water-soluble polymer is between 1000 and 3000.

[0010] In a further embodiment, the molar ratio of anion in the anionic dispersant to cation in the cationic dispersant is 1:(0.5-0.8).

[0011] Preferably, the molar ratio of anion in the anionic dispersant to cation in the cationic dispersant is 1:0.6.

[0012] In a further embodiment, the anionic dispersant is one of sodium dodecylbenzenesulfonate, benzoic acid, salicylic acid, 1-pyrenebutyric acid, and 2,5-thiophene dicarboxylic acid;

[0013] And / or, the cationic dispersant is one of cationic polyacrylamide and cationic polyvinylpyrrolidone.

[0014] This invention further discloses the application of the carbon nanotube composite dispersant as described above in the preparation of carbon nanotube dispersions.

[0015] The present invention further discloses a carbon nanotube dispersion, which is obtained by dispersing with the carbon nanotube composite dispersant as described above.

[0016] This invention further discloses a method for preparing a carbon nanotube dispersion, comprising the following steps:

[0017] The carbon nanotube powder, anionic dispersant and deionized water are thoroughly mixed and dispersed to obtain a pretreated carbon nanotube dispersion.

[0018] The pretreated carbon nanotube dispersion was mixed with a cationic dispersant and the dispersion was continued to obtain a carbon nanotube dispersion.

[0019] In a further embodiment, the carbon nanotube powder is selected from either arrayed carbon nanotubes or coiled carbon nanotubes.

[0020] Preferably, the size (length) of the carbon nanotube powder is 3-100 μm.

[0021] In a further embodiment, the mass ratio of the carbon nanotube powder to the anionic dispersant is 1:(0.25-2).

[0022] In a further embodiment, the mixing is achieved using ultrasound.

[0023] Preferably, the power of the ultrasound is 200-400W and the duration is 0.5-2h.

[0024] In a further embodiment, the dispersion is carried out using a high-speed homogeneous dispersion method;

[0025] Preferably, the high-speed homogeneous dispersion has a rotation speed of 10,000-20,000 rpm and a dispersion time of 10-60 min.

[0026] The beneficial effects of this invention are:

[0027] (1) The self-dispersing multifunctional composite dispersant disclosed in this invention is composed of two substances: anionic dispersant and cationic dispersant. The anionic dispersant provides aromatic rings, structurally similar to carbon nanotubes. These aromatic rings are anchored to the carbon nanotubes through π-π interactions, acting as anchoring groups. The cationic dispersant provides cations, which are electrostatically attracted to the anionic dispersant. Since anions have negative charges and cations have positive charges, the charge difference between them generates electrostatic attraction, leading to the formation of ionic bonds. These ionic bonds tightly bind the anions and cations together. Therefore, this increases the molecular weight of the dispersant, enhances steric hindrance, promotes the dispersion of carbon nanotubes, and prevents secondary aggregation between carbon nanotubes.

[0028] (2) The method for dispersing carbon nanotubes in this invention is a non-covalent functional method, which does not destroy the original structure of the carbon nanotubes and preserves their original sp. 2 The hybrid state is preserved, giving full play to its excellent performance.

[0029] (3) The carbon nanotube composite dispersant in this invention is obtained by compounding common raw materials, which is simple to synthesize and directly blends the raw materials. The dispersion process is simple to operate and suitable for industrial production. Moreover, the raw materials used are all sourced from the market and are inexpensive. In addition, the carbon nanotube slurry prepared by this invention has the characteristics of high concentration, high dispersibility and high stability, and can be used in fields such as conductivity, antistatic and corrosion prevention. Attached Figure Description

[0030] Figure 1 This is a schematic diagram illustrating the mechanism by which the carbon nanotube composite dispersant of the present invention disperses carbon nanotubes.

[0031] Figure 2 This is a scanning electron microscope image of the carbon nanotube aqueous dispersion in Example 5.

[0032] Figure 3 From left to right, the images show a comparison of the dispersion states of carbon nanotube aqueous dispersions in Example 5, Comparative Example 1, and Comparative Example 2. Detailed Implementation

[0033] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0035] The first aspect of the present invention provides a carbon nanotube composite dispersant, which is composed of an anionic dispersant and a cationic dispersant, wherein the anionic dispersant is an anionic small molecule containing an aromatic ring, and the cationic dispersant is a cationic water-soluble polymer.

[0036] The anionic dispersant described in this article is anionic small molecule material, defined as having a molecular weight <500 and containing an aromatic ring in its structure, thus enabling it to bind with carbon nanotubes through strong π-π bond interactions. The anionic dispersant described in this article may be one of sodium dodecylbenzenesulfonate, benzoic acid, salicylic acid, 1-pyrenebutyric acid, or 2,5-thiophene dicarboxylic acid, but is not limited to these.

[0037] The cationic dispersant described herein is a cationic water-soluble polymer with a molecular weight between 1000 and 3000. Here, water solubility refers to its solubility in water or an aqueous medium. This water-soluble polymer possesses a sufficient number of hydrophilic groups, such as amide groups, for water solubility. The cationic polymer described herein may be one of cationic polyacrylamide (CPAM) or cationic polyvinylpyrrolidone (CPVP), but is not limited to these.

[0038] The composite dispersant in this invention consists of anionic and cationic dispersants, and the dispersion mechanism utilizes the strong electrostatic attraction between anions and cations. Under external force, the anionic dispersant allows its small molecules to penetrate into the spaces between carbon nanotubes. The aromatic rings in its structure bind to the carbon nanotubes through strong π-π bond interactions. Subsequently, the cationic dispersant and anionic dispersants are electrostatically attracted to form hydrophilic segments, which helps stabilize the dispersion of carbon nanotubes in water and prevents secondary aggregation of the dispersed carbon nanotubes, thereby improving the quality and yield of the prepared carbon nanotube slurry. A schematic diagram of the carbon nanotube dispersion process is shown below. Figure 1 As shown in the image.

[0039] Furthermore, since small-molecule anionic dispersants adsorb more particles onto carbon nanotubes, resulting in less steric hindrance and a denser structure, the addition of cationic dispersants leads to a larger molecular weight and greater steric hindrance, preventing surrounding anions from attracting cations. Therefore, considering that the anions in the anionic dispersant cannot completely attract the cations in the cationic dispersant, and that excessive cationic dispersant would increase viscosity and hinder mechanical dispersion, a small amount of cationic dispersant is controlled during the specific preparation process. According to an embodiment of the present invention, the molar ratio of anions in the anionic dispersant to cations in the cationic dispersant is 1:(0.5-0.8); more preferably, the molar ratio of anions in the first substance to cations in the second substance is 1:0.6.

[0040] The second aspect of the present invention provides the application of the carbon nanotube composite dispersant described in the first aspect of the present invention in the preparation of carbon nanotube dispersions.

[0041] A third aspect of the present invention provides a carbon nanotube dispersion, which is obtained by dispersing the carbon nanotube composite dispersant described in the first aspect of the present invention.

[0042] A fourth aspect of this invention provides a method for preparing a carbon nanotube dispersion, comprising the following steps:

[0043] The carbon nanotube powder is thoroughly mixed with an anionic dispersant and deionized water to obtain a pretreated carbon nanotube dispersion.

[0044] A cationic dispersant was then added to the mixture, and the dispersion was continued to obtain an aqueous dispersion of carbon nanotubes.

[0045] There are no particular limitations on the type and size of the carbon nanotube powder. Any type of carbon nanotube powder commonly used in the art for preparing carbon nanotube slurry can be prepared using the preparation method of this invention. The selection can be made according to the actual situation. In some specific embodiments of this invention, the carbon nanotube powder is selected from one of arrayed carbon nanotubes and coiled carbon nanotubes, and the size (length) of the carbon nanotube powder is 3-100 μm.

[0046] In a further embodiment, the amount of anionic dispersant can be adjusted according to the amount of carbon nanotube powder. In some specific embodiments of the present invention, the mass ratio of the carbon nanotube powder to the anionic dispersant is 1:(0.25-2).

[0047] In a further embodiment, the dispersion of the present invention is mechanical dispersion, which is a conventional operation in the field. In order to further improve the dispersion efficiency, some embodiments of the present invention preferably use ultrasonic-assisted high-speed homogeneous dispersion. In some specific embodiments of the present invention, the power of the ultrasound is 200W-400W, and the time is 0.5-2h; the rotation speed of the high-speed homogeneous dispersion is 10000-20000rpm, and the dispersion time is 10-60min.

[0048] The present invention will be described below through specific embodiments. It should be noted that the specific embodiments below are for illustrative purposes only and do not limit the scope of the present invention in any way. In addition, unless otherwise specified, methods that do not specifically describe conditions or steps are conventional methods.

[0049] Information on some of the raw materials used in the following examples and comparative examples is as follows. Other reagents and materials not specified are commercially available:

[0050] Carbon nanotube powder, coiled carbon nanotubes, diameter 9-16nm, length 3-15μm, Jiangsu Xianfeng Nanomaterials Technology Co., Ltd.

[0051] Cationic polyvinylpyrrolidone with a molecular weight between 1000 and 3000 was synthesized using the method described in the reference "Preparation of Cationic Polyvinylpyrrolidone and its RNA Loading Performance".

[0052] Cationic polyacrylamide with a molecular weight between 1000 and 3000 was synthesized using the method described in the reference "Synthesis of low relative molecular mass cationic polyacrylamide and determination of its monomer content".

[0053] Example 1

[0054] In this embodiment, the carbon nanotube composite dispersant is composed of sodium dodecylbenzenesulfonate and cationic polyvinylpyrrolidone at a molar ratio of 1:0.5. The specific steps for preparing the carbon nanotube dispersion with this composite dispersant are as follows:

[0055] 2g of carbon nanotube powder was mixed evenly with sodium dodecylbenzenesulfonate and deionized water, wherein the mass ratio of carbon nanotube powder, sodium dodecylbenzenesulfonate and deionized water was 1:0.25:48.75. After ultrasonic dispersion for 0.5h under the assistance of ultrasonic power of 200W, it was homogenized at 10000rpm for 5min. Then, cationic polyvinylpyrrolidone with a molecular weight of 2400 was added and mixed evenly, and homogenized at 10000rpm for 5min. Through mechanical dispersion, a highly stable carbon nanotube aqueous dispersion with a carbon content of 2% was obtained.

[0056] Example 2

[0057] In this embodiment, the carbon nanotube composite dispersant is composed of sodium dodecylbenzenesulfonate and cationic polyacrylamide at a molar ratio of 1:0.6. The specific steps for preparing the carbon nanotube dispersion with this composite dispersant are as follows:

[0058] 0.5g of carbon nanotube powder was mixed evenly with sodium dodecylbenzenesulfonate and deionized water, wherein the mass ratio of carbon nanotube powder, sodium dodecylbenzenesulfonate and deionized water was 1:1:198. After ultrasonic dispersion for 1 hour with ultrasonic assistance at a power of 400W, it was homogenized at a high speed of 15000rpm for 10 minutes. Then, cationic polyacrylamide with a molecular weight of 2700 was added and mixed evenly, and homogenized at a high speed of 18000rpm for 10 minutes. Through mechanical dispersion, a highly stable carbon nanotube aqueous dispersion with a carbon content of 0.5% was obtained.

[0059] Example 3

[0060] In this embodiment, the carbon nanotube composite dispersant is composed of benzoic acid and cationic polyvinylpyrrolidone at a molar ratio of 1:0.8. The specific steps for preparing the carbon nanotube dispersion with this composite dispersant are as follows:

[0061] 3g of carbon nanotube powder was mixed evenly with benzoic acid and deionized water, wherein the mass ratio of carbon nanotube powder, benzoic acid and deionized water was 1:0.5:31.83. After ultrasonic dispersion for 0.5h under the assistance of 300W ultrasound, it was homogenized at 10000rpm for 30min. Then, cationic polyvinylpyrrolidone with a molecular weight of 1200 was added and mixed evenly, and homogenized at 20000rpm for 10min. Through mechanical dispersion, a highly stable carbon nanotube aqueous dispersion with a carbon content of 3% was obtained.

[0062] Example 4

[0063] In this embodiment, the carbon nanotube composite dispersant is composed of 1-pyrene butyric acid and cationic polyacrylamide at a molar ratio of 1:0.7. The specific steps for preparing the carbon nanotube dispersion with this composite dispersant are as follows:

[0064] 1g of carbon nanotube powder was mixed evenly with 1-pyrene butyric acid and deionized water, wherein the mass ratio of carbon nanotube powder, 1-pyrene butyric acid and deionized water was 1:2:97. After ultrasonic dispersion for 2 hours under the assistance of 200W ultrasound, it was homogenized at 18000rpm for 10 minutes. Then, cationic polyacrylamide with a molecular weight of 1300 was added and mixed evenly, and homogenized at 18000rpm for 5 minutes. Through mechanical dispersion, a highly stable carbon nanotube aqueous dispersion with a carbon content of 1% was obtained.

[0065] Example 5

[0066] In this embodiment, the carbon nanotube composite dispersant is composed of salicylic acid and cationic polyvinylpyrrolidone at a molar ratio of 1:0.6. The specific steps for preparing the carbon nanotube dispersion with this composite dispersant are as follows:

[0067] 5g of carbon nanotube powder was mixed evenly with salicylic acid and deionized water, wherein the mass ratio of carbon nanotube powder, salicylic acid and deionized water was 1:0.5:18.5. After ultrasonic dispersion for 1.5h under the assistance of 400W ultrasound, it was homogenized at 20000rpm for 15min. Then, cationic polyvinylpyrrolidone with a molecular weight of 1500 was added and mixed evenly, and homogenized at 20000rpm for 20min. Through mechanical dispersion, a highly stable carbon nanotube aqueous dispersion with a carbon content of 5% was obtained.

[0068] Comparative Example 1

[0069] This comparative example uses the same implementation method as Example 5, except that no dispersant is added.

[0070] The specific steps are as follows:

[0071] 5g of carbon nanotube powder was mixed evenly with deionized water, wherein the mass ratio of carbon nanotube powder to deionized water was 1:18.5. After ultrasonic dispersion for 1.5h under the assistance of 400W ultrasound, it was homogenized at 20000rpm for 35min. Through mechanical dispersion, a carbon nanotube aqueous dispersion with a carbon content of 5% was obtained.

[0072] Comparative Example 2

[0073] This comparative example uses the same implementation method as Example 5, except that the cationic dispersant cationic polyvinylpyrrolidone was not added. The specific steps are as follows:

[0074] 5g of carbon nanotube powder was mixed evenly with salicylic acid and deionized water, wherein the mass ratio of carbon nanotube powder, salicylic acid and deionized water was 1:0.5:18.5. After ultrasonic dispersion for 1.5h under the assistance of 400W ultrasound, it was homogenized at 20000rpm for 35min. Through mechanical dispersion, a carbon nanotube aqueous dispersion with a carbon content of 5% was obtained.

[0075] Comparative Example 3

[0076] This comparative example uses the same implementation method as Example 5, except that the anionic dispersant salicylic acid was not added. The specific steps are as follows:

[0077] Take 5g of carbon nanotube powder and mix it evenly with deionized water, wherein the mass ratio of carbon nanotube powder to deionized water is 1:18.5; after ultrasonic dispersion for 1.5h under ultrasonic assistance at a power of 400W, it is homogenized at a high speed of 20000rpm for 15min; then, cationic polyvinylpyrrolidone with a molecular weight of 1500 is added and mixed evenly, and homogenized at a high speed of 20000rpm for 20min. Through mechanical dispersion, a carbon nanotube aqueous dispersion with a carbon content of 5% is obtained.

[0078] Comparative Example 4

[0079] This comparative example uses the same implementation method as Example 5, except that the cationic dispersant is replaced with ordinary nonionic polyvinylpyrrolidone K30. The specific steps are as follows:

[0080] Take 5g of carbon nanotube powder and mix it evenly with salicylic acid and deionized water. The mass ratio of carbon nanotube powder, salicylic acid and deionized water is 1:0.5:18.5. After ultrasonic dispersion for 1.5h under the assistance of 400W ultrasound, it is homogenized at 20000rpm for 15min. Then, add polyvinylpyrrolidone K30 and mix evenly. It is also homogenized at 20000rpm for 20min. Through mechanical dispersion, a carbon nanotube aqueous dispersion with a carbon content of 5% is obtained.

[0081] Performance testing

[0082] 1. The dispersion of the carbon nanotube aqueous dispersion is shown in Table 1.

[0083] Table 1. Dispersion of carbon nanotube aqueous dispersion

[0084] Dispersion of carbon nanotube aqueous dispersion (visual inspection) Example 1 Stable, no stratification Example 2 Stable, no stratification Example 3 Stable, no stratification Example 4 Stable, no stratification Example 5 Stable, no stratification Comparative Example 1 There is a clear separation, with the supernatant being clear. Comparative Example 2 The layering is quite pronounced, and the upper layer contains a small amount of carbon nanotubes. Comparative Example 3 The layering is quite pronounced, and the upper layer contains a small amount of carbon nanotubes. Comparative Example 4 The layering is quite pronounced, and the upper layer contains a small amount of carbon nanotubes.

[0085] also, Figure 3 The figure shows a comparison of the dispersion states of the carbon nanotube aqueous dispersions in Example 5, Comparative Example 1, and Comparative Example 2.

[0086] The results above show that the composite dispersant used in this application has excellent carbon nanotube dispersion effect.

[0087] 2. SEM characterization: Figure 2 The image shows a scanning electron microscope image of the carbon nanotube aqueous dispersion in Example 5. As can be seen from the image, the entangled carbon nanotubes are opened up, and the circuitry of the carbon nanotubes can be seen, with some even in a single bundle state.

[0088] 3. Conductivity test

[0089] Test method: A certain mass of dispersion was extracted to obtain filter cake, which was dried and then hot-pressed at 120℃ and 20MPa for 10 minutes using a flat plate hot press. The resistivity was measured using a four-probe method at ten different locations, and the average value was calculated. The results are shown in Table 2.

[0090] Table 2. Conductivity Test Results

[0091]

[0092] In summary, it can be seen that the composite dispersant used in this invention has excellent carbon nanotube dispersion effect. Furthermore, the composite dispersant disperses carbon nanotubes based on a non-covalent functional method, which does not damage the original structure of the carbon nanotubes. The resulting carbon nanotube aqueous dispersion has the advantages of fewer defects, smaller particles, and better conductivity.

[0093] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0094] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A carbon nanotube composite dispersant, characterized in that, It is composed of anionic dispersant and cationic dispersant, wherein the anionic dispersant is an anionic small molecule containing an aromatic ring, and the cationic dispersant is a cationic water-soluble polymer; wherein the molecular weight of the anionic small molecule is <500; and the molecular weight of the cationic water-soluble polymer is between 1000 and 3000.

2. The carbon nanotube composite dispersant as described in claim 1, characterized in that, The molar ratio of anion in the anionic dispersant to cation in the cationic dispersant is 1:(0.5-0.8).

3. The carbon nanotube composite dispersant as described in claim 2, characterized in that, The molar ratio of anion in the anionic dispersant to cation in the cationic dispersant is 1:0.

6.

4. The carbon nanotube composite dispersant as described in claim 1, characterized in that, The anionic dispersant is one of sodium dodecylbenzenesulfonate, benzoic acid, salicylic acid, 1-pyrenebutyric acid, and 2,5-thiophene dicarboxylic acid; And / or, the cationic dispersant is one of cationic polyacrylamide and cationic polyvinylpyrrolidone.

5. The application of the carbon nanotube composite dispersant as described in any one of claims 1-4 in the preparation of carbon nanotube dispersions.

6. A carbon nanotube dispersion, characterized in that, It is obtained by dispersing with the carbon nanotube composite dispersant as described in any one of claims 1-4.

7. A method for preparing the carbon nanotube dispersion according to claim 6, characterized in that, Includes the following steps: The carbon nanotube powder, anionic dispersant and deionized water are thoroughly mixed and dispersed to obtain a pretreated carbon nanotube dispersion. The pretreated carbon nanotube dispersion was mixed with a cationic dispersant and the dispersion was continued to obtain a carbon nanotube dispersion.

8. The method for preparing the carbon nanotube dispersion as described in claim 7, characterized in that, The carbon nanotube powder is selected from either arrayed carbon nanotubes or coiled carbon nanotubes.

9. The method for preparing the carbon nanotube dispersion as described in claim 7 or 8, characterized in that, The length of the carbon nanotube powder is 3-100 μm.

10. The method for preparing the carbon nanotube dispersion as described in claim 7, characterized in that, The mass ratio of the carbon nanotube powder to the anionic dispersant is 1:(0.25-2).

11. The method for preparing the carbon nanotube dispersion as described in claim 7, characterized in that, The mixing process is achieved using ultrasound.

12. The method for preparing the carbon nanotube dispersion as described in claim 11, characterized in that, The ultrasound power is 200-400W, and the duration is 0.5-2h.

13. The method for preparing the carbon nanotube dispersion as described in claim 7, characterized in that, The dispersion is carried out using a high-speed homogeneous dispersion method.

14. The method for preparing the carbon nanotube dispersion as described in claim 13, characterized in that, The high-speed homogeneous dispersion is carried out at a rotation speed of 10,000-20,000 rpm and a dispersion time of 10-60 min.

Images