CN113603083A - Novel efficient modified CMC (carboxy methyl cellulose) water-phase stripping agent and application method thereof - Google Patents
Novel efficient modified CMC (carboxy methyl cellulose) water-phase stripping agent and application method thereof Download PDFInfo
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000001768 carboxy methyl cellulose Substances 0.000 title abstract description 14
- 229920002134 Carboxymethyl cellulose Polymers 0.000 title abstract description 9
- 235000010948 carboxy methyl cellulose Nutrition 0.000 title abstract description 9
- 239000008112 carboxymethyl-cellulose Substances 0.000 title abstract description 9
- 229940105329 carboxymethylcellulose Drugs 0.000 title abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 102
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical class [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims abstract description 51
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 150000007942 carboxylates Chemical class 0.000 claims abstract description 25
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 22
- 239000010439 graphite Substances 0.000 claims abstract description 22
- 239000012071 phase Substances 0.000 claims abstract description 14
- 239000008346 aqueous phase Substances 0.000 claims abstract description 12
- 239000008367 deionised water Substances 0.000 claims abstract description 12
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 12
- 238000002360 preparation method Methods 0.000 claims abstract description 6
- 239000006185 dispersion Substances 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 4
- 229920002678 cellulose Polymers 0.000 claims description 4
- 239000001913 cellulose Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000012065 filter cake Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- FDRCDNZGSXJAFP-UHFFFAOYSA-M sodium chloroacetate Chemical compound [Na+].[O-]C(=O)CCl FDRCDNZGSXJAFP-UHFFFAOYSA-M 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 239000011259 mixed solution Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000009210 therapy by ultrasound Methods 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims 1
- 239000000243 solution Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 abstract description 5
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 12
- 239000000463 material Substances 0.000 description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 239000010410 layer Substances 0.000 description 5
- 239000007791 liquid phase Substances 0.000 description 5
- 239000002356 single layer Substances 0.000 description 4
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- 230000007547 defect Effects 0.000 description 3
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000402 conductometric titration Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- -1 flake graphite Chemical compound 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
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- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000001694 spray drying Methods 0.000 description 1
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- 238000004227 thermal cracking Methods 0.000 description 1
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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
- C01B2204/00—Structure or properties of graphene
- C01B2204/04—Specific amount of layers or specific thickness
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2204/00—Structure or properties of graphene
- C01B2204/20—Graphene characterized by its properties
- C01B2204/32—Size or surface area
Abstract
The invention belongs to the technical field of graphene preparation, and particularly relates to a novel efficient modified CMC (carboxy methyl cellulose) water-phase stripping agent and an application method thereof. The modified sodium carboxymethylcellulose is prepared and dispersed in deionized water to be used as a stripping agent, and the aqueous phase stripping agent is used for dispersing graphite and then stripping is carried out through physical and mechanical effects. In the water phase stripping agent, the mass fraction of the modified sodium carboxymethylcellulose is 0.5-5%, and the mass fraction of the deionized water is 95-99.5%. The modified sodium carboxymethylcellulose is sodium carboxymethylcellulose with low carboxylate content, and the carboxylate content is within the range of 3.02-3.11 mmol/g. Compared with the prior art, the water-phase stripping agent provided by the invention can be used for efficiently stripping graphite by a simple physical stripping method, so that graphene with a large area and a small number of layers is obtained. The invention adopts the water phase stripping agent which takes water as the main body, so the production cost is lower and the harm to the environment is very small.
Description
Technical Field
The invention belongs to the technical field of graphene preparation, and particularly relates to a novel efficient modified CMC (carboxy methyl cellulose) water-phase stripping agent and an application method thereof.
Background
Graphene (Graphene) is sp2The hybridized and connected carbon atoms are tightly packed into a new material with a single-layer two-dimensional honeycomb lattice structure, as shown in figure 1. Graphene is the thinnest material known at present, and the monolayer graphene is only one carbon atom thickGraphene of this thickness possesses many properties not possessed by graphite. The graphene has better performance than other materials in the aspects of optics, mechanics and electricity, has very good prospects in various fields and is wide in application field, so that in recent years, the graphene industry is rapidly developed, and in the traditional fields of semiconductor industry, photovoltaic industry, lithium ion batteries, aerospace, military industry and the like and the emerging fields of new energy sources, new materials and the like, the graphene plays an increasingly important role and is considered to be a revolutionary material in the future.
Common production methods of the graphene powder commonly used at present are an oxidation-reduction method and a mechanical stripping method.
(1) A redox method: the method belongs to chemical stripping, and is proved to be capable of preparing graphene materials in batches as an important method for preparing the graphene materials, corresponding batch production lines appear in China, but due to severe oxidation, the prepared graphene oxide has high single-layer rate but more defects and damaged crystal structure, so that the performance in various aspects is reduced, and even if the reduced graphene oxide material is obtained by reduction means, the defects in the crystal structure cannot be completely repaired and internal oxygen-containing functional groups cannot be removed, so that the application range is limited. Moreover, the annual output of the graphene single line prepared by the method can only reach the tonnage level, the requirement of large-scale production cannot be met, and the corresponding manufacturing cost is also huge.
(2) Mechanical stripping method: the method belongs to physical stripping, and mainly comprises the steps of carrying out mechanical stripping through a liquid phase, and completely preserving the crystal structure of the prepared graphene material, but the number of layers is difficult to reach the number of layers of the graphene oxide. In liquid phase stripping, an oil phase is usually used as a liquid phase carrier, and the oil phase is an organic solvent, so that the method has certain corrosivity and pollution, and poor environmental protection benefit; and the manufacturing cost is higher, and the quality of the prepared graphene material is general. The annual output of the single graphene prepared by the method can reach ten tons, the large-scale production capacity is slightly improved, but the method has great test on continuous operation of equipment and high solvent discharge cost.
At present, chemical or physical pretreatment is mainly adopted in a redox method and a mechanical stripping method, and then organic liquid phase treatment is combined to complete large-scale production of graphene, and if water is used as a liquid phase dispersing agent on the premise of ensuring the quality of a graphene product, the cost and the environmental pollution are greatly reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a novel high-efficiency modified CMC aqueous phase stripping agent and an application method thereof.
The modified sodium carboxymethylcellulose is prepared and dispersed in deionized water to be used as the stripping agent, the water-phase stripping agent is used for dispersing graphite, and stripping is carried out through the physical mechanical action, so that the excellent stripping effect is obtained, and the excellent environmental protection property and the economical efficiency are achieved.
The water phase stripping agent used in the invention comprises uniformly mixed deionized water and modified sodium carboxymethylcellulose, wherein the mass fraction of the modified sodium carboxymethylcellulose is 0.5-5%, and the mass fraction of the deionized water is 95-99.5%. The modified sodium carboxymethylcellulose is sodium carboxymethylcellulose with low carboxylate content, and specifically, the carboxylate content is within a range of 3.02-3.11 mmol/g.
The application method of the water phase stripping agent mainly comprises the following steps:
(S1) preparation of a release agent: mixing deionized water and modified sodium carboxymethylcellulose in proportion, and uniformly dispersing to form a suspension, namely a stripping agent;
(S2) preparing a graphite dispersion liquid: adding graphite powder into the stripping agent, and uniformly dispersing to form graphite dispersion liquid;
(S3) ultrasonic peeling: transferring the graphite dispersion liquid to an ultrasonic workstation, heating and ultrasonically treating to obtain stripped graphene dispersion liquid;
(S4) separating graphene: and (3) carrying out hydraulic filtration on the graphene dispersion liquid to obtain a filter cake, washing with water and drying to obtain graphene powder.
The aqueous phase stripping agent achieves stripping effect and prevents secondary aggregation of graphene by destroying interlayer acting force of graphite and wrapping and stabilizing the graphene, so that the method can be theoretically applied to various kinds of graphene, such as flake graphite, expanded graphite, thermal cracking graphite and the like.
Has the advantages that: compared with the prior art, the water-phase stripping agent provided by the invention can be used for efficiently stripping graphite by a simple physical stripping method, so that graphene with a large area and a small number of layers is obtained. The invention adopts the water phase stripping agent which takes water as the main body, so the production cost is lower and the harm to the environment is very small.
Drawings
Fig. 1 is a schematic structural diagram of graphene.
Fig. 2a is a TEM photograph of the graphene obtained in example 1.
Fig. 2b is a TEM photograph of the graphene obtained in comparative example 4.
Detailed Description
Cellulose is used as a raw material, sodium hydroxide is used for alkalization reaction, and then sodium chloroacetate is used for processing to obtain a series of sodium carboxymethylcellulose with low carboxylate content, namely modified sodium carboxymethylcellulose. The specific operation steps are as follows: weighing 1.0g of cellulose, putting the cellulose into a reactor, sequentially adding 60mL of acetone, 15mL of isopropanol, 2mL of NaOH aqueous solution with the mass fraction of 30% and 0.2-0.5 g of sodium chloroacetate, carrying out ultrasonic treatment in a water bath at 55 ℃ for 1-4 h, centrifuging and collecting to obtain a solid, washing for 3 times by using a mixed solution of methanol and water (the volume ratio is 10:1), and drying to obtain the modified sodium carboxymethylcellulose shown in Table 1.
TABLE 1
| Carboxylate content (mmol/g) | 2.95 | 2.98 | 3.02 | 3.08 | 3.11 | 3.17 | 3.21 |
| Sodium chloroacetate dosage (g) | 0.20 | 0.25 | 0.30 | 0.35 | 0.40 | 0.45 | 0.50 |
| Reaction time (h) | 4.0 | 3.0 | 2.5 | 2.0 | 1.5 | 1.0 | 1.0 |
Wherein, the content of the carboxylate of the modified sodium carboxymethylcellulose is measured by using a conductometric titration method, and the operation steps are as follows: weighing 0.2g of sample, dissolving in 80ml of deionized water, ultrasonically dispersing for 10min, titrating by using 0.1mol/L hydrochloric acid standard solution, recording a change relation curve of the dropping amount of the conductivity hydrochloric acid standard solution, finding a mutation point of a slope on the curve, and recording the consumption amount of hydrochloric acid corresponding to the mutation point as V. Calculation formula of carboxylate content: the carboxylate content was (V × 0.1mol/L)/0.2 g.
The modified sodium carboxymethylcellulose is prepared into a stripping agent, and graphite is stripped to obtain graphene.
(S1) preparation of a release agent. Adding a certain amount of modified sodium carboxymethylcellulose into deionized water, and performing high-speed shearing by using a three-stage ultrahigh-speed homogenizing emulsifying machine until a uniformly dispersed suspension is formed, thus obtaining the stripping agent. In the prepared stripping agent, the mass fraction of the modified sodium carboxymethylcellulose is different from 0.5-5%.
(S2) preparing a graphite dispersion. Adding 30g of graphite powder into 1000mL of stripping agent, and carrying out high-speed shearing for 10min by using a three-stage ultrahigh-speed homogenizing emulsifying machine to obtain a graphite dispersion liquid.
(S3) ultrasonic peeling. And transferring the graphite dispersion liquid to an ultrasonic workstation, heating and ultrasonically treating for a period of time to obtain the stripped graphene dispersion liquid. The ultrasonic workstation adopts an XO-SM300 type ultrasonic workstation produced by Nanjing Europe-first Instrument manufacturing Limited company, the volume of the ultrasonic workstation is 400-4000 mL, the ultrasonic frequency is 25KHz, and the ultrasonic power is 0-2500W.
(S4) isolating the graphene. And (3) carrying out dispersion hydraulic filtration on the graphene to obtain a filter cake, washing the filter cake for 3 times by using deionized water, and carrying out spray drying to obtain graphene powder.
Example 1
In the embodiment, the mass fraction of the modified sodium carboxymethylcellulose in the stripping agent is 1.2%, the carboxylate content of the modified sodium carboxymethylcellulose is 3.08mmol/g, the stripping temperature is 50 ℃, the stripping time is 1.5h, the ultrasonic power is 2000W, and the graphite powder is flake graphite powder.
Example 2
In the embodiment, the mass fraction of the modified sodium carboxymethylcellulose in the stripping agent is 0.5%, the carboxylate content of the modified sodium carboxymethylcellulose is 3.08mmol/g, the stripping temperature is 50 ℃, the stripping time is 2.0h, the ultrasonic power is 2500W, and the graphite powder is flake graphite powder.
Example 3
In the embodiment, the mass fraction of the modified sodium carboxymethylcellulose in the stripping agent is 2.3%, the carboxylate content of the modified sodium carboxymethylcellulose is 3.08mmol/g, the stripping temperature is 50 ℃, the stripping time is 2.0h, the ultrasonic power is 1800W, and the graphite powder is flake graphite powder.
Example 4
In the embodiment, the mass fraction of the modified sodium carboxymethylcellulose in the stripping agent is 3.5%, the carboxylate content of the modified sodium carboxymethylcellulose is 3.08mmol/g, the stripping temperature is 50 ℃, the stripping time is 2.5h, the ultrasonic power is 1500W, and the graphite powder is expanded graphite powder.
Example 5
In the embodiment, the mass fraction of the modified sodium carboxymethylcellulose in the stripping agent is 5.0%, the carboxylate content of the modified sodium carboxymethylcellulose is 3.08mmol/g, the stripping temperature is 50 ℃, the stripping time is 1.5h, the ultrasonic power is 2200W, and the graphite powder is expanded graphite powder.
Example 6
In the embodiment, the mass fraction of the modified sodium carboxymethylcellulose in the stripping agent is 1.2%, the carboxylate content of the modified sodium carboxymethylcellulose is 3.02mmol/g, the stripping temperature is 50 ℃, the stripping time is 1.5h, the ultrasonic power is 2000W, and the graphite powder is flake graphite powder.
Example 7
In the embodiment, the mass fraction of the modified sodium carboxymethylcellulose in the stripping agent is 1.2%, the carboxylate content of the modified sodium carboxymethylcellulose is 3.11mmol/g, the stripping temperature is 50 ℃, the stripping time is 1.5h, the ultrasonic power is 2000W, and the graphite powder is flake graphite powder.
Comparative example 1
In the embodiment, the mass fraction of the modified sodium carboxymethylcellulose in the stripping agent is 1.2%, the carboxylate content of the modified sodium carboxymethylcellulose is 2.98mmol/g, the stripping temperature is 50 ℃, the stripping time is 1.5h, the ultrasonic power is 2000W, and the graphite powder is flake graphite powder.
Comparative example 2
In the embodiment, the mass fraction of the modified sodium carboxymethylcellulose in the stripping agent is 1.2%, the carboxylate content of the modified sodium carboxymethylcellulose is 2.95mmol/g, the stripping temperature is 50 ℃, the stripping time is 1.5h, the ultrasonic power is 2000W, and the graphite powder is flake graphite powder.
Comparative example 3
In the embodiment, the mass fraction of the modified sodium carboxymethylcellulose in the stripping agent is 1.2%, the carboxylate content of the modified sodium carboxymethylcellulose is 3.17mmol/g, the stripping temperature is 50 ℃, the stripping time is 1.5h, the ultrasonic power is 2000W, and the graphite powder is flake graphite powder.
Comparative example 4
In the embodiment, the mass fraction of the modified sodium carboxymethylcellulose in the stripping agent is 1.2%, the carboxylate content of the modified sodium carboxymethylcellulose is 3.21mmol/g, the stripping temperature is 50 ℃, the stripping time is 1.5h, the ultrasonic power is 2000W, and the graphite powder is flake graphite powder.
Comparative example 5
In this example, commercially available sodium carboxymethylcellulose (ordered from alatin and having a carboxylate content of 3.72mmol/g) was used. In the embodiment, the mass fraction of the sodium carboxymethylcellulose is 1.2%, the stripping temperature is 50 ℃, the stripping time is 1.5h, the ultrasonic power is 2000W, and the graphite powder is flake graphite powder.
The properties of the graphene produced in each example and comparative example are shown in table 2. The sheet diameters of the graphenes prepared in examples 1 to 7 are mainly concentrated in the range of 1.0 to 5.0 μm, and the thicknesses are concentrated in the range of 0.5 to 2.5nm, and single-layer and multi-layer graphene are mainly used. Examples 1, 6 and 7 and comparative examples 1 to 5 compare the content of the carboxylate in the modified sodium carboxymethylcellulose, and the carboxylate content is found to have a very significant and sensitive effect on the stripping of graphene, so that graphene with a large sheet diameter and a small number of layers can be stripped within a range of 3.02 to 3.11 mmol/g.
TABLE 2
| Sample examples | Graphene sheet diameter (mum) | Graphene thickness (nm) |
| Example 1 | 2.0-5.0 | 0.5-1.5 |
| Example 2 | 2.0-5.0 | 1.0-2.5 |
| Example 3 | 1.0-5.0 | 0.5-1.5 |
| Example 4 | 1.0-5.0 | 1.0-2.5 |
| Example 5 | 0.5-2.0 | 0.5-2.5 |
| Example 6 | 1.5-5.0 | 0.5-2.0 |
| Example 7 | 1.5-5.0 | 0.5-2.0 |
| Comparative example 1 | 0.5-1.5 | 2.0-4.0 |
| Comparative example 2 | 0.2-1.0 | 2.0-5.0 |
| Comparison ofExample 3 | 0.5-2.0 | 2.0-4.0 |
| Comparative example 4 | 0.5-2.0 | 2.5-5.0 |
| Comparative example 5 | 1.0-3.5 | 5.0-8.5 |
The above embodiments are exemplary only, and are intended to illustrate the technical concept and features of the present invention so that those skilled in the art can understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (9)
1. A novel high-efficiency modified CMC water-phase stripping agent is characterized in that: the modified sodium carboxymethylcellulose solution comprises deionized water and modified sodium carboxymethylcellulose which are uniformly mixed, wherein the mass fraction of the modified sodium carboxymethylcellulose is 0.5-5%.
2. The aqueous phase stripping agent according to claim 1, characterized in that: the mass fraction of the deionized water is 95-99.5%.
3. The aqueous phase stripping agent according to claim 1, characterized in that: the content of the carboxylate of the modified sodium carboxymethylcellulose is within the range of 3.02-3.11 mmol/g.
4. The aqueous phase stripping agent according to claim 3, characterized in that: the preparation method of the modified sodium carboxymethylcellulose comprises the following steps: putting 1.0g of cellulose into a reactor, sequentially adding 60mL of acetone, 15mL of isopropanol, 2mL of NaOH aqueous solution with the mass fraction of 30% and 0.2-0.5 g of sodium chloroacetate, carrying out ultrasonic treatment in a water bath at 55 ℃ for 1-4 h, centrifuging and collecting to obtain a solid, washing with a mixed solution of methanol and water (the volume ratio is 10:1), and drying to obtain modified sodium carboxymethylcellulose; or scaled equally.
5. The method of using the aqueous phase stripping agent according to claim 3, characterized in that: dispersing graphite powder in the aqueous phase stripping agent to form a suspension, and stripping the graphite powder by ultrasonic wave, grinding or high-pressure overflow impact to obtain single or multiple pieces of superposed graphene.
6. The method for applying an aqueous phase stripping agent according to claim 5, characterized in that: and stripping by ultrasonic waves, wherein the graphene is selected from crystalline flake graphite and expanded graphite.
7. The method for applying an aqueous phase stripping agent according to claim 5, characterized in that: the method comprises the following steps:
(S1) preparation of a release agent: mixing deionized water and modified sodium carboxymethylcellulose in proportion, and uniformly dispersing to form a suspension, namely a stripping agent;
(S2) preparing a graphite dispersion liquid: adding graphite powder into the stripping agent, and uniformly dispersing to form graphite dispersion liquid;
(S3) ultrasonic peeling: transferring the graphite dispersion liquid to an ultrasonic workstation, heating and ultrasonically treating to obtain stripped graphene dispersion liquid;
(S4) separating graphene: and (3) carrying out hydraulic filtration on the graphene dispersion liquid to obtain a filter cake, washing with water and drying to obtain graphene powder.
8. The method for applying an aqueous phase stripping agent according to claim 7, characterized in that: in the step (S2), the ratio of the graphite dispersion liquid is: 30g of graphite powder is added to each 1000mL of stripping agent.
9. The method for applying an aqueous phase stripping agent according to claim 8, characterized in that: in the step (S1), the mass fraction of the modified sodium carboxymethylcellulose in the stripping agent is 1.2%, and the carboxylate content of the modified sodium carboxymethylcellulose is 3.08 mmol/g; in step (S3), the peeling temperature was 50 ℃, the peeling time was 1.5 hours, and the ultrasonic power was 2000W.
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