CN117049526A - Application of dispersion grinding aid in preparation of graphene slurry and graphene slurry - Google Patents
Application of dispersion grinding aid in preparation of graphene slurry and graphene slurry Download PDFInfo
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- 239000006245 Carbon black Super-P Substances 0.000 description 2
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- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/184—Preparation
- C01B32/19—Preparation by exfoliation
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/194—After-treatment
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1409—Abrasive particles per se
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Nanotechnology (AREA)
- Inorganic Chemistry (AREA)
- Carbon And Carbon Compounds (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
Abstract
The application provides an application of a dispersion grinding aid in preparation of graphene slurry and the graphene slurry, wherein the dispersion grinding aid comprises carbon black particles, the carbon black particles are crushed bodies with a carbon black primary structure, and the particle diameter D50 of the carbon black particles is smaller than 300nm. The carbon black particles can be used as a dispersing grinding aid for graphene, can improve sanding efficiency, can be used as a physical barrier dispersing agent for expanded graphite and graphene, and can prevent graphene sheets from overlapping.
Description
The application relates to a split application of a Chinese patent application, which is originally applied for application days 2018-12-26, has application number of CN201811596851.1 and has the name of 'a dispersing grinding aid for graphene and a preparation method thereof'.
Technical Field
The application belongs to the field of graphene dispersing aids, and particularly relates to application of a dispersing grinding aid in preparation of graphene slurry and the graphene slurry.
Background
Graphene is a thin-layer two-dimensional nano material, has high specific surface area and high surface energy, has strong van der Waals force and large pi bond conjugation between sheet layers, and is easy to agglomerate and fold. When graphene is prepared by a liquid phase exfoliation method, a dispersing agent is generally added to prevent agglomeration and lamination in order to prevent irreversible lamination of the exfoliated graphene.
The dispersing agent which is commonly added in the industry is an organic surfactant or an organic polymer, and the organic dispersing agent is an impurity in a sense that the performance of graphene, particularly the conductivity, is affected. Such as: (1) a surfactant such as: the conventional dispersing agent used in patent CN201610001211.6 is polyvinyl alcohol, gelatin, tween series and span series; (2) polymeric coating barriers such as: PVDF is added to the patent CN 201510962558.2; (3) pi-pi coupled dispersants such as: in patent CN201510770154.3, pi-pi complex of electroactive polymer containing aniline oligomer unit is added.
Another dispersant commonly added in the industry is a small-sized inorganic dispersant, essentially a physical barrier agent, such as carbon black, carbon tubes. For example, patent CN201410828853.4 adds a small-sized barrier: acetylene black, ketjen black, carbon nanotubes. However, because the acetylene black, ketjen black, carbon nanotubes and graphene are difficult to match in size, and the contact points and contact areas are small, so that the binding force is weak, besides the small-size blocking agent, dispersing agents and adhesives are also required to be added, and the final conductivity can be influenced.
When the liquid phase stripping method is used for preparing graphene by taking expanded graphite as a raw material, two main effects occur: peeling between the expanded graphite sheets and reduction in the diameter of the graphite sheets, a sand mill is now commonly used in industry for peeling and crushing. The technical difficulty is that the expanded graphite sheet is high in strength, not easy to break and peel, and in order to achieve the required granularity and sheet thickness, the expanded graphite sheet needs to be peeled and grinded for a long time and has high requirements on equipment, so that the popularization and application of the graphene slurry are affected under the condition of high production cost. In the face of this, there is a great need to find grinding aids compatible with graphene systems.
Disclosure of Invention
Aiming at the defects of the prior art, the application provides a dispersion grinding aid for graphene and a preparation method thereof, wherein the dispersion grinding aid comprises the following components:
aiming at the defects of the prior art, the application provides a dispersion grinding aid for graphene and a preparation method thereof, wherein the dispersion grinding aid comprises the following components:
a dispersion grinding aid for graphene, the dispersion grinding aid comprising carbon black particles, the carbon black particles being carbon black crushed bodies, the carbon black particles having a particle diameter D50 of less than 300nm as measured by a laser particle sizer.
Optionally, the carbon black particles have a particle size D50 of less than 200nm as measured by a laser particle sizer.
Optionally, the carbon black particles are crushed bodies of carbon black primary structures.
Optionally, the dispersion grinding aid is a dispersion of the carbon black particles comprising a solvent.
Optionally, the solvent is any one or a combination of two of an organic solvent and a resin.
Alternatively, the dispersion grinding aid is prepared from a dispersion of carbon black by crushing with a high pressure homogenizer.
Optionally, the carbon black particles have a solids content of 0.1 to 10wt% in the dispersion of the carbon black particles.
Optionally, the carbon black is composed of one or more of acetylene black, byproduct carbon black and furnace black.
Adding carbon black with a primary structure into a solvent, pre-dispersing the carbon black with a dispersing disc, filtering large particles by a sieve to obtain carbon black dispersion liquid with the primary structure, and then adding the carbon black dispersion liquid with the primary structure into a high-pressure homogenizer for homogenizing and crushing.
Optionally, the pressure of the high-pressure homogenizer is greater than 80MPa.
Compared with the prior art, the dispersing grinding aid for graphene provided by the application comprises carbon black particles, wherein the carbon black particles are crushed bodies of a carbon black primary structure, and the carbon black particles of the dispersing grinding aid are inserted between expanded graphite layers and adsorbed on the expanded graphite layers, so that the molecular acting force between expanded graphite sheets is weakened, the crack defect of the expanded graphite is expanded, and the difficulty in grinding and crushing the expanded graphite is reduced. And the carbon black particles are crushed bodies of carbon black primary structures, and the presence of the carbon black corners is more advantageous for grinding, as compared with known low-structure nano carbon black particles (nearly spherical non-corners), although the particle size may be similar in size. Under the action force of the grinding medium, as the graphene and the expanded graphite both adsorb carbon black particles, the graphene and the expanded graphite are easy to slide between sheets, so that the viscosity of the slurry is reduced, the rheological property is improved, and the sanding efficiency is improved. Meanwhile, the carbon black particles can also be used as a physical barrier dispersing agent for expanded graphite and graphene, so that the graphene sheets are prevented from overlapping, and the effect of stable dispersion is achieved.
Drawings
FIG. 1 shows the particle size distribution of carbon blacks of example 1 and comparative example 1 under different treatment conditions.
Fig. 2 is a graph of graphene morphology with the addition of a dispersion grinding aid according to example 4 of the present application.
Fig. 3 is an SEM image of graphene powder having carbon black adsorbed on the surface of comparative example 4.
Detailed Description
The present application will be described in further detail with reference to the following examples, but the present application is not limited to the following embodiments.
The dispersing grinding aid for graphene of the specific embodiment of the application comprises carbon black particles, wherein the particle diameter D50 of the carbon black particles is smaller than 300nm. The inventor finds through research that the component structure of the carbon black particles is very similar to that of graphite, the size of the carbon black particles is very small, the carbon black particles are easily adsorbed on the surface of expanded graphite, the surface free energy of graphene is reduced, meanwhile, the carbon black particles are crushed bodies of carbon black primary structural bodies, the edges of the carbon black particles are sharp, the crack defects of the expanded graphite can be expanded, and the sanding easiness is improved; and the carbon black particles are crushed bodies of carbon black primary structures, and the edges and corners of the carbon black are more beneficial to grinding, compared with the known nano carbon black particles with low structures (nearly spherical non-edges and corners), although the particle sizes may be similar; the carbon black particles are partly crushed graphite microcrystals on the microcosmic scale, so that the slip effect can be realized, the viscosity of slurry can be reduced, the rheological property can be improved, and the sanding efficiency can be improved; and meanwhile, the carbon black crushed particles can also be used as a physical barrier dispersing agent for expanded graphite and graphene, so that the graphene sheets are prevented from overlapping. Generally, an organic dispersant is added into the graphene conductive paste to prevent sedimentation, the organic dispersant can damage the conductivity of the graphene conductive paste, and the carbon black particles have conductivity, so that the conductivity of the graphene conductive paste is not reduced. Further, in order to satisfy the better grinding aid property, the particle diameter D50 of the carbon black particles measured by a laser particle sizer is less than 200nm, and the particle diameter of the carbon black particles is usually equal to or larger than the primary particle diameter of the carbon black. The particle size D50 refers to the particle size corresponding to the cumulative particle size distribution percentage reaching 50%, particles larger than the particle size account for 50%, particles smaller than the particle size account for 50%, D50 is also called median diameter or median particle size, and D50 is commonly used for representing the average particle size of powder.
The dispersion grinding aid for graphene of the specific embodiment of the application is a dispersion liquid of the carbon black particles containing a solvent, wherein the solvent can be any one or a combination of two of an organic solvent and a resin, and is preferably an organic solvent, and the organic solvent comprises but is not limited to: NMP (N-methylpyrrolidone), DMF (N, N-dimethylformamide), N-dimethylacetamide, dimethylsulfoxide, ethanol, isopropanol, benzyl alcohol, ethyl acetate, toluene, xylene, tetrahydrofuran and the like, and NMP and DMF are more preferable. In the dispersion of the carbon black particles, the solid content of the carbon black particles is 0.1 to 10wt%, preferably 1 to 8wt%, and specifically may be, for example, 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, or the like.
The dispersion grinding aid for graphene of the specific embodiment of the application is prepared by crushing a dispersion liquid of carbon black through a high-pressure homogenizer.
The application relates to a dispersion grinding aid for graphene, which is prepared from one or more of acetylene black, byproduct carbon black and furnace carbon black.
The application relates to a dispersion grinding aid for graphene, which is prepared from one or more of acetylene black, byproduct carbon black and furnace carbon black.
The dispersion grinding aid disclosed by the application is suitable for preparing graphene slurry, and the mass ratio of the dispersion grinding aid to expanded graphite or graphene is 1: 200-1: 2, preferably the mass ratio is 1: 200-1: 20.1. the preparation of the graphene slurry is carried out by dispersing and mixing a dispersion grinding aid, expanded graphite and a solvent uniformly by a high-speed dispersing machine to obtain a premix; and then placing the premix into a sand mill to perform sand grinding liquid phase stripping to obtain graphene slurry containing a dispersion grinding aid, wherein the dispersion grinding aid and the expanded graphite or graphene sheet are mutually attracted through Van der Waals force and pi-pi acting force, and can be closely attached to the surfaces of the expanded graphite and the graphene without adding an organic dispersing agent.
The specific embodiment of the application also provides a preparation method of the dispersion grinding aid for graphene, which comprises the steps of adding carbon black into a solvent, pre-dispersing the carbon black by using a dispersion disc, filtering out large particles by using a sieve to obtain a carbon black dispersion liquid, and then adding the carbon black dispersion liquid into a high-pressure homogenizer for homogenizing and crushing. Under the high temperature condition in the carbon black manufacturing process, adjacent primary particles are generated simultaneously, mutually fused into a chain shape and occupy a three-dimensional space, and the structure is called a primary structure and is also called a primary structure. The original structure is usually difficult to break, the original structure can be broken by a high-pressure homogenizer for the first time, and in order to break up carbon black and fuse together into a grape cluster-shaped aggregate, the shearing force of cavitation effect and turbulence by using the high-pressure homogenizer is needed, and the pressure of the high-pressure homogenizer is more than 80Mpa, preferably more than 100 Mpa. In order to prevent the high pressure homogenizer from plugging, the dispersion of carbon black needs to be screened to remove large agglomerates, the mesh number of the screen being 50 mesh or more, preferably 80 mesh or more.
Further description will be given below by way of specific examples.
The raw material description:
carbon black: available from Shanghai Haiyaku Koch Co., ltd., manufactured by Yi Rui Shi Co., ltd., model number is Super PLi
Expanded graphite: purchased from Shanghai Sail graphite Co., ltd., expansion ratio 400 times, particle size 300. Mu.m.
NMP: purchased from ataxia-allied Chemie Co., ltd, and the purity was electronic purity.
Test description:
viscosity test: the test was carried out using a DV2T-RV viscometer produced by Brookfield. The rotor is 21, the interval between the values is set to be 5 seconds and the time is set to be 1 minute, and the average viscosity of the last three points is taken as the viscosity value of the measured sample. Shear rate (shear rate) at test was set to 10S -1 . The temperature at the time of the test was controlled at 25.+ -. 1 ℃.
D50 particle size test: the testing equipment is a laser particle size analyzer S2600 of Dandong and a laser particle size analyzer, NMP is used as a mobile phase, the refractive index is 1.8 and 0.7 of an imaginary part during testing, 1 droplet of slurry sample is taken by a small dropper to drop into a sample pool after the mobile phase background is scanned, the ultrasonic treatment is carried out for 30 seconds by a built-in ultrasonic machine of the laser particle size analyzer before testing, and the average value is obtained through continuous testing.
Pole piece resistivity test: the graphene composite slurry is used in a ternary system material of a lithium ion battery, the mass ratio of ternary active material NCM523 to polyvinylidene fluoride to graphene composite slurry conductive agent is 100:1.5:1.5 (calculated by conductive agent), the solid content is adjusted to 72% by adding NMP, the mixture is stirred for 2 hours to prepare positive slurry, the positive slurry is coated on a PET film, and the positive electrode sheet is obtained after 90-degree drying. The pole piece (PET film) is cut into a square with the length of 5cmx5cm, the thickness of the pole piece is measured by a screw micrometer, and the resistivity of the pole piece is measured by a Suzhou lattice ST2258C type four-probe resistivity tester.
SEM test: filtering out NMP (N-methyl pyrrolidone) serving as a solvent in 200ml of graphene slurry containing a dispersion grinding aid by using a solvent filter, adding 3000ml of deionized water, repeatedly washing for a plurality of times, replacing NMP to obtain 200ml of graphene aqueous slurry, performing ultrasonic dispersion for 1 minute, quickly freezing the graphene aqueous slurry into thin blocks, performing freeze drying by using a freeze dryer to obtain graphene powder, and finally placing the graphene powder into a field emission scanning electron microscope for SEM (scanning electron microscope) test.
Sedimentation stability test: placing 150g of graphene slurry into a transparent glass bottle with a volume of 150ml, standing at a sealed room temperature, observing sedimentation conditions at intervals of weeks, testing the solid content value of the slurry at a position 1/3 higher than the liquid level under different standing time, and considering that the slurry has settled when the test value is 10% different from the initial solid content value when the test value is just prepared, wherein the time is the sedimentation stability time.
Examples
Example 1
50g of carbon black Super P Li was added to 950g of NMP, pre-dispersed for 15 minutes at 1500rpm with a dispersion disk, and then passed through a 80-mesh stainless steel sieve to obtain a carbon black dispersion. Adding the carbon black dispersion liquid into high-pressure homogenization, homogenizing under 120MPa for 1 time to obtain a dispersion grinding aid 1; putting the carbon black dispersion liquid into a high-pressure homogenizer, homogenizing for 1 time under the homogenizing pressure of 100MPa to obtain a dispersion grinding aid 2; and (3) placing the carbon black dispersion liquid into a high-pressure homogenizer, homogenizing for 1 time under the homogenizing pressure of 80MPa, and obtaining the dispersion grinding aid 3. The carbon black dispersion and the resulting 3 dispersion grinding aids were each tested for particle size by a laser particle sizer, the results of which are shown in fig. 1 and table 1.
Example 2
16g of the dispersion grinding aid 1 (calculated by solid content) obtained in example 1, 384g of expanded graphite with expansion ratio of 400 times, 7280g of solvent NMP were dispersed and mixed uniformly for 1 hour by using a high-speed dispersing machine at 2500RPM to obtain a premix; and then the premix is put into a sand mill for sand grinding liquid phase stripping, the linear speed of the sand mill is 12m/s, the diameter of zirconium beads of the sand mill is 1 millimeter, and the sand grinding time is 5 hours, so that the graphene slurry containing the dispersion grinding aid is obtained. The particle size and viscosity of the sanded intermediate state material was measured for 2 hours. The obtained graphene slurry is subjected to viscosity test, granularity test and pole piece resistivity test, and the results are shown in Table 2; the SEM was tested by water-washing lyophilization and the results are shown in figure 2.
Example 3
The dispersion grinding aid used in example 2 was replaced with dispersion grinding aid 2, with the other conditions unchanged.
Example 4
The dispersion grinding aid used in example 2 was replaced with dispersion grinding aid 3, with the other conditions unchanged.
Comparative example
Comparative example 1
400g of carbon black Super P Li is added into 7600g of NMP, and the mixture is dispersed and mixed evenly for 1 hour by using a high-speed dispersing machine at 2500RPM to obtain carbon black dispersoid; and then the carbon black dispersoid is put into a sand mill for sand liquid phase stripping, the linear speed of the sand mill is 12m/s, the diameter of zirconium beads of the sand mill is 1 millimeter, and the sand milling time is 2 hours, so that the carbon black sand abrasive is obtained. The particle size was measured by a laser particle sizer and the results are shown in fig. 1 and table 1.
Comparative example 2
Dispersing and uniformly mixing 400g of expanded graphite with expansion ratio of 400 times and 7600g of solvent NMP with 2500RPM of a high-speed dispersing machine for 1 hour to obtain premix; and then the premix is put into a sand mill for sand grinding liquid phase stripping, the linear speed of the sand mill is 12m/s, the diameter of zirconium beads of the sand mill is 1 millimeter, and the sand grinding time is 5 hours, so that the carbon black and graphene compound slurry is obtained. The particle size and viscosity of the sanded intermediate state material was measured for 2 hours. The resulting composite slurry was subjected to viscosity testing, particle size testing and pole piece resistivity, the results are shown in table 2.
Comparative example 3
Dispersing and uniformly mixing 16g of carbon powder Super P Li, 384g of expanded graphite with expansion ratio of 400 times and 7600g of solvent NMP for 1 hour by using a high-speed dispersing machine at 2500RPM to obtain a premix; and then the premix is put into a sand mill for sand grinding liquid phase stripping, the linear speed of the sand mill is 12m/s, the diameter of zirconium beads of the sand mill is 1 millimeter, and the sand grinding time is 5 hours, so that the carbon black and graphene compound slurry is obtained. The particle size and viscosity of the sanded intermediate state material was measured for 2 hours. The resulting composite slurry was subjected to viscosity testing, particle size testing and pole piece resistivity, the results are shown in table 2.
Comparative example 4
Referring to CN20141082885, 30g of graphene and 10g of carbon black are stirred in ethanol for ultrasonic treatment for 1h, uniformly mixed and dried at 80 ℃ to obtain graphene powder with carbon black adsorbed on the surface, and the result is shown in figure 3 by a test SEM. 16g of dispersing agent PVP K30 powder, 384g of graphene powder with carbon black adsorbed on the surface, and NMP are diluted to 8kg of slurry with the solid content of 5%, and the slurry is placed into a sand mill for sand grinding liquid phase stripping, wherein the linear speed of the sand mill is 12m/s, the diameter of zirconium beads of the sand mill is 1 millimeter, and the sand grinding time is 5 hours, so that the carbon black and graphene compound slurry is obtained. The particle size and viscosity of the sanded intermediate state material was measured for 2 hours. The resulting composite slurry was subjected to viscosity testing, particle size testing and pole piece resistivity, the results are shown in table 2.
Comparative example 5
Dispersing and mixing 16g of dispersing agent PVP K30 powder, 384g of expanded graphite with expansion ratio of 400 times and 7600g of solvent NMP for 1 hour by using a high-speed dispersing machine at 2500RPM to obtain premix; and then the premix is put into a sand mill for sand grinding liquid phase stripping, the linear speed of the sand mill is 12m/s, the diameter of zirconium beads of the sand mill is 1 millimeter, and the sand grinding time is 5 hours, so that the carbon black and graphene compound slurry is obtained. The particle size and viscosity of the sanded intermediate state material was measured for 2 hours. The resulting composite slurry was subjected to viscosity testing, particle size testing and pole piece resistivity, the results are shown in table 2.
TABLE 1
TABLE 2
From fig. 1 and table 1, it can be seen that conventional dispersion and sanding cannot break up the carbon black primary structure. The high-pressure homogenizer breaks up the primary structure of the carbon black to obtain particles of the carbon black, i.e., primary particles of the carbon black.
The D50 values of the dispersion grinding aid 1, the dispersion grinding aid 2 and the dispersion grinding aid 3 obtained in example 1 in Table 1 show that the D50 values of the carbon black particles obtained under different homogenization pressures are different, and when the homogenization pressure is greater than 80MPa, the D50 value can be less than 200nm, and the result of using 3 different D50 dispersion grinding aids in Table 2 is that the particle size of the dispersion grinding aid is slightly smaller.
According to the results of table 2, in example 2, compared with comparative example 2, the addition of the dispersion grinding aid can effectively reduce the viscosity of the slurry when the expanded graphite is peeled off, and the particle size of the addition of the dispersion grinding aid is reduced more rapidly and the grinding efficiency is higher at the same grinding time. The results of comparative example 3 show that the direct addition of carbon black is effective without crushing the carbon black before addition. The results of comparative examples 4 and 5 show that the addition of the dispersant PVP, which is commonly used in the industry, drastically reduces the viscosity of the slurry and improves the sanding efficiency, but deteriorates the sedimentation stability of the slurry. Overall, the results in table 2 show that the overall properties (e.g., pole piece resistivity, sedimentation stability, grinding stripping efficiency) of graphene with added dispersion grinding aid are improved, and that the viscosity during grinding is lower, and the size is smaller, the viscosity is higher, and the crushing stripping efficiency is higher, than that obtained without adding dispersion grinding aid at the same time.
According to fig. 2, it can be seen that the carbon black particles can be closely adhered to the surface of graphene, so that the graphene sheets can be prevented from being overlapped, and an adhesive and an organic dispersing agent are not required. From fig. 3, it can be seen that the carbon black is loosely adhered to the graphene sheet in the form of beads, the contact point and adsorption point of the graphene and the carbon black primary structure are small, the falling off is easy, and the addition amount of the carbon black is high.
Although the present application is disclosed above, the present application is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the application, and the scope of the application should be assessed accordingly to that of the appended claims.
Claims (10)
1. The use of a dispersion grinding aid in the preparation of a graphene slurry, characterized in that the dispersion grinding aid comprises carbon black particles, the particle size D50 of which is less than 300nm as measured by a laser particle sizer.
2. The use according to claim 1, characterized in that the carbon black nibs have a particle diameter D50 of less than 200nm as measured by a laser granulometer.
3. The use according to claim 1, wherein the carbon black nibs are crushed bodies of carbon black primary structures.
4. The use according to claim 1, wherein the dispersion grinding aid is a dispersion of the carbon black particles comprising a solvent.
5. The use according to claim 4, wherein the solvent is any one or a combination of two of an organic solvent and a resin.
6. The use according to claim 3, wherein the dispersion grinding aid is prepared from a dispersion of carbon black by crushing with a high pressure homogenizer.
7. The use according to claim 4, characterized in that the carbon black granulate has a solids content of 0.1 to 10 wt.% in the dispersion of the carbon black granulate.
8. The use according to claim 1, characterized in that the carbon black consists of one or several of acetylene black, by-product carbon black and furnace carbon black.
9. The graphene slurry is characterized in that the dispersion grinding aid comprises carbon black particles, and the particle size D50 of the carbon black particles is smaller than 300nm.
10. The graphene slurry according to claim 9, wherein the graphene slurry is prepared by: dispersing and uniformly mixing a dispersing grinding aid, expanded graphite and a solvent by using a high-speed dispersing machine to obtain a premix; and then placing the premix into a sand mill to perform sand grinding liquid phase stripping to obtain the graphene slurry containing the dispersion grinding aid.
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