CN109455696B - Aqueous carbon nanotube slurry and preparation method thereof - Google Patents
Aqueous carbon nanotube slurry and preparation method thereof Download PDFInfo
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- CN109455696B CN109455696B CN201811235809.7A CN201811235809A CN109455696B CN 109455696 B CN109455696 B CN 109455696B CN 201811235809 A CN201811235809 A CN 201811235809A CN 109455696 B CN109455696 B CN 109455696B
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- C—CHEMISTRY; METALLURGY
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- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/158—Carbon nanotubes
- C01B32/168—After-treatment
- C01B32/174—Derivatisation; Solubilisation; Dispersion in solvents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F31/00—Mixers with shaking, oscillating, or vibrating mechanisms
- B01F31/80—Mixing by means of high-frequency vibrations above one kHz, e.g. ultrasonic vibrations
- B01F31/83—Mixing by means of high-frequency vibrations above one kHz, e.g. ultrasonic vibrations comprising a supplementary stirring element
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/83—Mixing plants specially adapted for mixing in combination with disintegrating operations
- B01F33/831—Devices with consecutive working receptacles, e.g. with two intermeshing tools in one of the receptacles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
- B01F33/8361—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating
- B01F33/83613—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating by grinding or milling
Abstract
The invention discloses a water-based carbon nanotube slurry and a preparation method thereof, and the preparation method comprises the following steps: a) reserving 10-20% of the total mass of the deionized water, and mixing and dispersing the rest of the deionized water, the dispersing agent A, the dispersing agent B, the wetting agent and the humectant in a dispersion machine to obtain a premix; b) adding carbon nano tubes into the premix obtained in the step a) for dispersion, dispersing for not less than 30 minutes by using a dispersion machine at a speed higher than 200 revolutions per minute, and adding the deionized water reserved in the step a) in the dispersion process to obtain pre-dispersed carbon nano tube slurry; c) grinding and dispersing the pre-dispersed carbon nano tube slurry obtained in the step b) in a grinder for 3-10 times, and then performing ultrasonic dispersion treatment for 0.5-2 hours to obtain the water-based carbon nano tube slurry.
Description
Technical Field
The invention relates to water-based carbon nanotube slurry, and belongs to the field of fine chemical engineering.
Background
Carbon nanotubes have received much attention because of their unique nanostructure and excellent mechanical, electrical, magnetic and optical properties. However, the carbon nano tube has few surface defects, lacks active groups and has lower dispersing ability in water and solvents; in addition, the carbon atoms in the carbon nano-tube are mainly SP2The hybridization mode forms highly delocalized big pi bonds, so that strong van der waals force exists among the carbon nanotubes, and the specific surface area and the long diameter of the carbon nanotubes are large, so that the dispersion in a solvent is seriously influenced, and particularly the dispersion in water is poor. Generally, carbon nanotubes are intertwined together and exist in the form of aggregates, which affects the physical properties of the carbon nanotubes and greatly limits the applications of the carbon nanotubes in the fields of battery conductive agents, coatings (conductive/antistatic, heat dissipation and corrosion prevention), rubber and latex, cement, polymer coatings, textiles and the like.
In the fields of conductive coatings, conductive ink and the like in which carbon nanotubes are used as functional additives, the critical problem to be solved is that the carbon nanotubes are uniformly and stably dispersed in a solvent, particularly water. In recent years, various methods for dispersing aqueous carbon nanotubes have been disclosed, including physical methods such as ultrasonic wave, mechanical stirring, ball milling, etc., and for example, U.S. Pat. No. US2006039848 discloses a method for preparing a single-walled carbon nanotube dispersion by ultrasonic dispersion treatment at a high frequency of at least 20 KHZ; however, the ultrasonic dispersion device is small in scale, is only suitable for laboratory preparation, and is not suitable for large-scale industrial production. The conventional ultrasonic wave needs to be filled with a medium, and the volume of a substance to be ultrasonically dispersed is small, and for example, US6438998 discloses an ultrasonic dispersing apparatus for silicone gel, which is ultrasonically dispersed through a bent pipe. The traditional ultrasonic dispersing device is suitable for dispersing and mixing low-viscosity materials, the liquid content of the high-viscosity materials is low, the fluidity is not good, the ultrasonic transmission is not facilitated, and an important way for improving the ultrasonic dispersing effect is provided by equipment improvement, and Chinese patent CN201610763172.3 discloses ultrasonic strong dispersing equipment for high-viscosity slurry, which comprises an ultrasonic dispersing device, an autoclave, a homogenizer and a low-pressure kettle.
Another method for dispersing the aqueous carbon nanotube slurry is a surface modification method, which is classified into covalent bond modification and non-covalent bond modification, wherein the non-covalent bond modification is a main method because the structure of the carbon nanotube itself is not damaged. Research shows that the carbon nano tubes can be well dispersed uniformly by using physical dispersion and surface modification simultaneously. Chinese patent CN201310350352.5 discloses a method for preparing aqueous carbon nanotube slurry by using lithium salt or sodium salt of naphthalene sulfonic acid-styrene sulfonic acid-maleic anhydride polymer as a dispersant, adding a defoaming agent and a suspension thickener, and adopting a stirring or sanding method; chinese patent CN201410114650.9 discloses a method for preparing carbon nanotube conductive paste by grinding, using common dispersant: at least one of polyvinylpyrrolidone, polyvinyl alcohol, polyethylene glycol, sodium carboxymethylcellulose, sodium dodecyl sulfonate and sodium dodecyl benzene sulfonate.
The aqueous carbon nanotube slurry prepared by the prior art still has certain defects, such as the problems of sedimentation, aggregation and the like of the carbon nanotube slurry in a short time, and the performances of the slurry such as stability and the like are difficult to meet the requirements of customers.
Disclosure of Invention
In order to overcome the technical defects, the invention provides the water-based carbon nanotube slurry and the preparation method thereof, the method carries out non-covalent modification on the carbon nanotube by using two dispersants, and a benzene ring in the dispersant has strong attraction with carbon atoms in the carbon nanotube, so that the dispersant and the carbon nanotube are combined; the sulfonate in the dispersant has good water solubility, so that the combination of the dispersant and the carbon nano tube can be fully dispersed in water. In addition, the dispersant A is polymethylene diphenyl diether sulfonate, has excellent surface activity and also has good dispersibility and wettability. The polyoxyethylene ether chain segment in the dispersant B plays a good role in the transition of the carbon nano tube dispersed in water, so that the benzene ring and the sulfonate can play a role independently. The ultrasonic dispersion device for dispersing the carbon nanotube slurry is formed by orderly arranging a plurality of ultrasonic generators into a plurality of layers, and each layer is arranged by a plurality of ultrasonic generators at equal intervals, so that the large-scale ultrasonic dispersion of the carbon nanotube slurry is realized, and the high-viscosity carbon nanotube slurry can be ultrasonically dispersed. The aqueous carbon nanotube slurry prepared by grinding and ultrasonic dispersion treatment by using two dispersing agents has good storage stability.
The technical scheme of the invention is as follows:
an aqueous carbon nanotube slurry comprises the following components:
carbon nanotubes accounting for 2-10% of the total mass of the carbon nanotube slurry,
20-80% of dispersant A in the mass percentage of the carbon nano tube,
dispersant B accounting for 5-50% of the mass of the carbon nano tube,
a wetting agent accounting for 0.1 to 5.0 percent of the mass percent of the carbon nano tube,
a humectant accounting for 2-20% of the total mass of the carbon nano tube slurry,
defoaming agent accounting for 0.1-0.5 percent of the total mass of the carbon nano tube slurry,
the balance of deionized water;
the structural general formula of the dispersant A is as follows:
R1is a straight chain or branched chain alkyl group having 1 to 20 carbon atoms, a is an integer of 1 to 10, M is H, K, Na, NH4One or more of；
The dispersing agent B is alkylphenol polyoxyethylene ether sulfonate or plant polyphenol polyoxyethylene ether sulfonate, wherein the structural general formula of the alkylphenol polyoxyethylene ether sulfonate is as follows:
R2is a straight chain or branched chain alkyl group having 1 to 10 carbon atoms, b is an integer of 1 to 30, M is H, K, Na, NH4One or more of them.
Further, the carbon nano tube is one or a mixture of a single-wall carbon nano tube and a multi-wall carbon nano tube.
Further, the wetting agent is at least one of phosphatidylcholine and dodecyl glucoside.
Further, the humectant is at least one of ethylene glycol, propylene glycol, glycerin and diethylene glycol.
Further, the defoaming agent is at least one of polysiloxane ether copolymer and polyether compound.
The preparation method of the aqueous carbon nanotube slurry is characterized by comprising the following steps of:
a) reserving 10-20% of the total mass of the deionized water, and mixing and dispersing the rest of the deionized water, the dispersing agent A, the dispersing agent B, the wetting agent and the humectant in a dispersion machine to obtain a premix;
b) adding carbon nano tubes into the premix obtained in the step a) for dispersion, dispersing for not less than 30 minutes by using a dispersion machine at a speed higher than 200 revolutions per minute, and adding the deionized water reserved in the step a) in the dispersion process to obtain pre-dispersed carbon nano tube slurry;
c) grinding and dispersing the pre-dispersed carbon nano tube slurry obtained in the step b) in a grinder for 3-10 times, and then performing ultrasonic dispersion treatment for 0.5-2 hours to obtain the water-based carbon nano tube slurry.
Further, a defoaming agent is added during the grinding in step c).
An ultrasonic dispersion apparatus includes a plurality of ultrasonic generator layers arranged in an orderly fashion.
Further, the ultrasonic generator layer is formed by arranging a plurality of ultrasonic generators at equal intervals.
Compared with the prior art, the invention has the beneficial technical effects that: the invention provides aqueous carbon nanotube slurry and a preparation method thereof, the method carries out non-covalent modification on a carbon nanotube by using two dispersants, and a benzene ring in the dispersant has strong attraction with carbon atoms in the carbon nanotube, so that the dispersant and the carbon nanotube are combined; the sulfonate in the dispersant has good water solubility, so that the combination of the dispersant and the carbon nano tube can be fully dispersed in water. The ultrasonic dispersion device for dispersing the carbon nano tube slurry is formed by orderly arranging a plurality of ultrasonic generators into a plurality of layers, and each layer is arranged by a plurality of ultrasonic generators at equal intervals, so that the large-scale ultrasonic dispersion of the carbon nano tube slurry is realized, and the high-viscosity carbon nano tube slurry can be ultrasonically dispersed. The aqueous carbon nanotube slurry obtained through mixing, dispersing, grinding and ultrasonic dispersing treatment has good storage stability, and the preparation method has high efficiency and realizes large-scale automatic continuous and integrated production.
Drawings
Fig. 1 is a schematic view of an apparatus for dispersing an aqueous carbon nanotube slurry according to the present invention.
FIG. 2 is a schematic cross-sectional view of an ultrasonic dispersion apparatus.
1 disperser, 2 first delivery pumps, 3 grinders, 4 second delivery pumps, 5 ultrasonic dispersing devices, 5-1 ultrasonic generators, 6 third delivery pumps and 7 liquid storage tanks.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
the examples and comparative examples were prepared by the following methods:
a) reserving 10-20% of the total mass of the deionized water, and mixing and dispersing the rest of the deionized water, the dispersing agent A, the dispersing agent B, the wetting agent and the humectant in a dispersion machine 1 to obtain a premix;
b) adding carbon nanotubes into the premix obtained in the step a) for dispersion, dispersing for not less than 30 minutes by using a dispersion machine 1 at a speed higher than 200 revolutions per minute, and adding the deionized water reserved in the step a) in the dispersion process to obtain pre-dispersed carbon nanotube slurry;
c) grinding and dispersing the pre-dispersed carbon nanotube slurry obtained in the step b) in a grinder 3 for 3-10 times by using a first conveying pump 2, sending the pre-dispersed carbon nanotube slurry to an ultrasonic dispersing device 5 by using a second conveying pump 4 for ultrasonic dispersing for 0.5-2 hours to obtain aqueous carbon nanotube slurry, and sending the aqueous carbon nanotube slurry to a liquid storage tank 7 by using a third conveying pump 6.
In order to reduce the generation of bubbles during the milling process, an antifoaming agent is added during the milling in step c).
In order to improve the ultrasonic dispersion effect, a plurality of ultrasonic generator layers which are orderly arranged are arranged in the ultrasonic dispersion device 5, and the ultrasonic generator layers are formed by arranging a plurality of ultrasonic generators 5-1 at equal intervals.
The dispersants A and B used in the examples and comparative examples are specifically:
the structural general formula of the dispersant A is as follows:
in dispersant A1, R1Is C10H21A is 6, M is Na;
in dispersant A2, R1Is CH3A is 10 and M is K;
in dispersant A3, R1Is C20H41A is 1, M is NH4。
The dispersant B is alkylphenol polyoxyethylene ether sulfonate or plant polyphenol polyoxyethylene ether sulfonate, wherein the general formula of the alkylphenol polyoxyethylene ether sulfonate is as follows:
in dispersant B1, R2Is C5H11-b is 15 and M is Na;
in dispersant B2, R2Is C10H21-b is 30 and M is H;
the dispersant B3 is catechol polyoxyethylene ether sulfonate.
Specifically, the method comprises the following steps:
example 1
Reserving 10 parts of deionized water, and dispersing 68.82 parts of deionized water, 3 parts of a dispersing agent A1, 1.8 parts of a dispersing agent B1, 0.18 part of phosphatidylcholine and 10 parts of ethylene glycol in a dispersing machine to obtain a premix; adding 6 parts of multi-walled carbon nanotubes into the premix for dispersion, dispersing for 40 minutes at the speed of 600 revolutions per minute by using a dispersion machine, and adding 10 parts of reserved deionized water in the dispersion process to obtain pre-dispersed carbon nanotube slurry; and grinding and dispersing the pre-dispersed carbon nanotube slurry in a grinding machine for 8 times, adding 0.2 part of polysiloxane ether copolymer in the grinding process, and then performing ultrasonic dispersion treatment for 1 hour to obtain the aqueous carbon nanotube slurry.
Example 2
Reserving 15 parts of deionized water, and dispersing 78.2 parts of deionized water, 1.6 parts of a dispersing agent A2, 1 part of a dispersing agent B2, 0.1 part of dodecyl glucoside and 2 parts of glycerol in a dispersion machine to obtain a premix; adding 2 parts of single-walled carbon nanotubes into the premix for dispersion, dispersing for 50 minutes at the speed of 500 revolutions per minute by using a dispersion machine, and adding 15 parts of reserved deionized water in the dispersion process to obtain pre-dispersed carbon nanotube slurry; and grinding and dispersing the pre-dispersed carbon nanotube slurry in a grinder for 3 times, adding 0.1 part of polyether compound in the grinding process, and then performing ultrasonic dispersion treatment for 2 hours to obtain the aqueous carbon nanotube slurry.
Example 3
Reserving 10 parts of deionized water, and dispersing 53.49 parts of deionized water, 2 parts of a dispersant A3, 4 parts of a dispersant B3, 0.005 part of phosphatidylcholine, 0.005 part of dodecyl glucoside and 20 parts of diethylene glycol in a dispersion machine to obtain a premix; adding 6 parts of multi-walled carbon nanotubes and 4 parts of single-walled carbon nanotubes into the premix for dispersion, dispersing for 60 minutes at the speed of 200 revolutions per minute by using a dispersion machine, and adding 10 parts of reserved deionized water in the dispersion process to obtain pre-dispersed carbon nanotube slurry; grinding and dispersing the pre-dispersed carbon nanotube slurry in a grinder for 10 times, adding 0.2 part of polysiloxane ether copolymer and 0.3 part of polyether compound in the grinding process, and then performing ultrasonic dispersion treatment for 0.5 hour to obtain the water-based carbon nanotube slurry.
Example 4
Reserving 10 parts of deionized water, and dispersing 66.25 parts of deionized water, 3 parts of a dispersant A1, 0.15 part of a dispersant B2, 0.1 part of a dispersant B3, 0.2 part of phosphatidylcholine, 10 parts of ethylene glycol and 5 parts of propylene glycol in a dispersion machine to obtain a premix; adding 5 parts of multi-walled carbon nanotubes into the premix for dispersion, dispersing for 30 minutes at the speed of 400 revolutions per minute by using a dispersion machine, and adding 10 parts of reserved deionized water in the dispersion process to obtain pre-dispersed carbon nanotube slurry; grinding and dispersing the pre-dispersed carbon nanotube slurry in a grinder for 6 times, adding 0.3 part of polyether compound in the grinding process, and then performing ultrasonic dispersion treatment for 1.5 hours to obtain the aqueous carbon nanotube slurry.
Comparative example 1
Reserving 10 parts of deionized water, and dispersing 70.62 parts of deionized water, 3 parts of a dispersing agent A1, 0.18 part of phosphatidylcholine and 10 parts of ethylene glycol in a dispersion machine to obtain a premix; adding 6 parts of multi-walled carbon nanotubes into the premix for dispersion, dispersing for 40 minutes at the speed of 600 revolutions per minute by using a dispersion machine, and adding 10 parts of reserved deionized water in the dispersion process to obtain pre-dispersed carbon nanotube slurry; and grinding and dispersing the pre-dispersed carbon nanotube slurry in a grinding machine for 8 times, adding 0.2 part of polysiloxane ether copolymer in the grinding process, and then performing ultrasonic dispersion treatment for 1 hour to obtain the aqueous carbon nanotube slurry.
Comparative example 2
Reserving 10 parts of deionized water, and dispersing 71.82 parts of deionized water, 1.8 parts of dispersant B1, 0.18 part of phosphatidylcholine and 10 parts of ethylene glycol in a dispersion machine to obtain a premix; adding 6 parts of multi-walled carbon nanotubes into the premix for dispersion, dispersing for 40 minutes at the speed of 600 revolutions per minute by using a dispersion machine, and adding 10 parts of reserved deionized water in the dispersion process to obtain pre-dispersed carbon nanotube slurry; and grinding and dispersing the pre-dispersed carbon nanotube slurry in a grinding machine for 8 times, adding 0.2 part of polysiloxane ether copolymer in the grinding process, and then performing ultrasonic dispersion treatment for 1 hour to obtain the aqueous carbon nanotube slurry.
Comparative example 3
Reserving 10 parts of deionized water, and dispersing 68.82 parts of deionized water, 3 parts of a dispersing agent A1, 1.8 parts of sodium dodecyl benzene sulfonate, 0.18 part of phosphatidylcholine and 10 parts of ethylene glycol in a dispersing machine to obtain a premix; adding 6 parts of multi-walled carbon nanotubes into the premix for dispersion, dispersing for 40 minutes at the speed of 600 revolutions per minute by using a dispersion machine, and adding 10 parts of reserved deionized water in the dispersion process to obtain pre-dispersed carbon nanotube slurry; and grinding and dispersing the pre-dispersed carbon nanotube slurry in a grinding machine for 8 times, adding 0.2 part of polysiloxane ether copolymer in the grinding process, and then performing ultrasonic dispersion treatment for 1 hour to obtain the aqueous carbon nanotube slurry.
Comparative example 4
Reserving 10 parts of deionized water, and dispersing 70.5 parts of deionized water, 3 parts of sodium dodecyl benzene sulfonate, 1.8 parts of dispersant B1, 0.18 part of phosphatidylcholine and 10 parts of ethylene glycol in a dispersion machine to obtain a premix; adding 6 parts of multi-walled carbon nanotubes into the premix for dispersion, dispersing for 40 minutes at the speed of 600 revolutions per minute by using a dispersion machine, and adding 10 parts of reserved deionized water in the dispersion process to obtain pre-dispersed carbon nanotube slurry; and grinding and dispersing the pre-dispersed carbon nanotube slurry in a grinding machine for 8 times, adding 0.2 part of polysiloxane ether copolymer in the grinding process, and then performing ultrasonic dispersion treatment for 1 hour to obtain the aqueous carbon nanotube slurry.
Comparative example 5
Reserving 10 parts of deionized water, and dispersing 70.5 parts of deionized water, 3 parts of sodium salt of a naphthalenesulfonic acid-styrenesulfonic acid-maleic anhydride polymer, 0.18 part of phosphatidylcholine and 10 parts of ethylene glycol in a dispersion machine to obtain a premix; adding 6 parts of multi-walled carbon nanotubes into the premix for dispersion, dispersing for 40 minutes at the speed of 600 revolutions per minute by using a dispersion machine, and adding 10 parts of reserved deionized water in the dispersion process to obtain pre-dispersed carbon nanotube slurry; and grinding and dispersing the pre-dispersed carbon nanotube slurry in a grinding machine for 8 times, adding 0.2 part of polysiloxane ether copolymer in the grinding process, and then performing ultrasonic dispersion treatment for 1 hour to obtain the aqueous carbon nanotube slurry.
Comparative example 6
Reserving 10 parts of deionized water, and dispersing 68.82 parts of deionized water, 3 parts of sodium dodecyl benzene sulfonate, 1.8 parts of polyvinylpyrrolidone, 0.18 part of phosphatidylcholine and 10 parts of ethylene glycol in a dispersion machine to obtain a premix; adding 6 parts of multi-walled carbon nanotubes into the premix for dispersion, dispersing for 40 minutes at the speed of 600 revolutions per minute by using a dispersion machine, and adding 10 parts of reserved deionized water in the dispersion process to obtain pre-dispersed carbon nanotube slurry; and grinding and dispersing the pre-dispersed carbon nanotube slurry in a grinding machine for 8 times, adding 0.2 part of polysiloxane ether copolymer in the grinding process, and then performing ultrasonic dispersion treatment for 1 hour to obtain the aqueous carbon nanotube slurry.
Stability testing of aqueous carbon nanotube slurries
Use of
Stability Analyzer the clarity index (instability index) of the aqueous carbon nanotube slurries prepared in examples 1-4 and comparative examples 1-6 was measured under conditions of 25 deg.C and centrifugation at 2000 rpm for 250 minutes, with a smaller clarity index indicating better stability. Table 1 shows the results, and examples 1-4 have a smaller clarification index after centrifugation, indicating good dispersion stability and almost no change in stability; comparative examples 1-6 have higher clarification indices after centrifugation, indicating poorer centrifuge stability.
TABLE 1 clarification index of aqueous carbon nanotube slurries
As can be seen from table 1, the clarity index of the aqueous carbon nanotube slurry containing both the dispersant a and the dispersant B is significantly better than that of the aqueous carbon nanotube slurry containing one of the dispersant a or B and the other dispersant, indicating that the aqueous carbon nanotube slurry of the present invention has good stability.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein. Simple variations or modifications made without departing from the core of the invention fall within the scope of protection of the invention.
Claims (7)
1. The aqueous carbon nanotube slurry is characterized by comprising the following components:
carbon nanotubes accounting for 2-10% of the total mass of the carbon nanotube slurry,
20-80% of dispersant A in the mass percentage of the carbon nano tube,
dispersant B accounting for 5-50% of the mass of the carbon nano tube,
a wetting agent accounting for 0.1 to 5.0 percent of the mass percent of the carbon nano tube,
a humectant accounting for 2-20% of the total mass of the carbon nano tube slurry,
defoaming agent accounting for 0.1-0.5 percent of the total mass of the carbon nano tube slurry,
the balance of deionized water;
the structural general formula of the dispersant A is as follows:
R1is a straight chain or branched chain alkyl group having 1 to 20 carbon atoms, a is an integer of 1 to 10, M is H, K, Na, NH4One or more of the above;
the dispersing agent B is alkylphenol polyoxyethylene ether sulfonate or plant polyphenol polyoxyethylene ether sulfonate, wherein the structural general formula of the alkylphenol polyoxyethylene ether sulfonate is as follows:
R2is a straight chain or branched chain alkyl group having 1 to 10 carbon atoms, b is an integer of 1 to 30, M is H, K, Na, NH4One or more of them.
2. The aqueous carbon nanotube slurry according to claim 1, wherein said carbon nanotubes are single-walled carbon nanotubes, multi-walled carbon nanotubes, or a mixture thereof.
3. The aqueous carbon nanotube slurry according to claim 1, wherein the wetting agent is at least one of phosphatidylcholine and dodecyl glycoside.
4. The aqueous carbon nanotube slurry according to claim 1, wherein the humectant is at least one of ethylene glycol, propylene glycol, glycerin, and diethylene glycol.
5. The aqueous carbon nanotube slurry according to claim 1, wherein the defoaming agent is at least one of a polysiloxane ether copolymer and a polyether compound.
6. The method for preparing an aqueous carbon nanotube slurry according to any one of claims 1 to 5, comprising the steps of:
a) reserving 10-20% of the total mass of the deionized water, and mixing and dispersing the rest of the deionized water, the dispersing agent A, the dispersing agent B, the wetting agent and the humectant in a dispersion machine to obtain a premix;
b) adding carbon nano tubes into the premix obtained in the step a) for dispersion, dispersing for not less than 30 minutes by using a dispersion machine at a speed higher than 200 revolutions per minute, and adding the deionized water reserved in the step a) in the dispersion process to obtain pre-dispersed carbon nano tube slurry;
c) grinding and dispersing the pre-dispersed carbon nano tube slurry obtained in the step b) in a grinder for 3-10 times, and then performing ultrasonic dispersion treatment for 0.5-2 hours to obtain the water-based carbon nano tube slurry.
7. The method for preparing an aqueous carbon nanotube slurry according to claim 6, wherein an antifoaming agent is added during the grinding in step c).
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