Preparation method for improving conductivity of carbon black

Abstract

The invention relates to the technical field of carbon black, in particular to a preparation method for improving conductivity of carbon black, which comprises the following steps: activating carbon black by potassium hydroxide, then performing plasma treatment to obtain a porous carbon black material, performing heat treatment on the porous carbon black material by a nitrogen source compound, and then performing treatment by a mixed amino acid solution to obtain the carbon black. And carrying out sensitization treatment to obtain a sensitized carbon black material, adding a silver nitrate solution into the sensitized carbon black material, adding a silver ammonia solution into a carbon black material loaded in silver crystals, dropwise adding formaldehyde for reaction, and then filtering, washing and drying to obtain a high-conductivity carbon black product. By adopting the preparation method, the conductivity of the carbon black can be greatly improved.

Description

Technical Field

[0001] This invention relates to the field of carbon black technology, and in particular to a method for preparing carbon black to improve its conductivity. Background Technology

[0002] Carbon black is an amorphous carbon with various properties such as dispersion, adsorption, and conductivity. Based on these properties, it is widely used in environmental protection, chemical industry, food, and pharmaceuticals. In the battery and energy sector, carbon black is commonly used as an additive to improve the conductivity of electrode materials. However, existing carbon black has poor conductivity, affecting the performance of batteries or electrode materials. Therefore, it is necessary to develop a method for preparing carbon black that improves conductivity. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for improving the conductivity of carbon black, which can be used to obtain carbon black products with high conductivity, in order to address the shortcomings of the prior art.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0005] A method for preparing carbon black with improved conductivity, the method comprising the following steps:

[0006] (1) Take carbon black with a particle size of 50-60nm, add solid potassium hydroxide, stir and mix well, and then activate it under nitrogen protection. After the activation treatment is completed, wash the filtrate until it is neutral and no potassium ions are detected. Dry the porous carbon black material for later use.

[0007] (2) Take the porous carbon black material described in step (1), and treat it with plasma to obtain the plasma-treated porous carbon black material for later use.

[0008] (3) Take the porous carbon black material after plasma treatment in step (2), add an aqueous solution of nitrogen source compound, heat and stir, filter, dry and then heat treat to obtain surface-modified porous carbon black material for later use.

[0009] (4) Take the surface-modified porous carbon black material described in step (3), add a mixed amino acid solution, adjust the pH, heat, stir, filter, and dry to obtain carbon black material loaded with a mixed amino acid adsorption layer for later use.

[0010] (5) Take the carbon black material loaded with the mixed amino acid adsorption layer in step (4), add stannous chloride hydrochloric acid solution and stir to carry out sensitization treatment. After the sensitization treatment is completed, filter, wash and dry to obtain the sensitized carbon black material for later use.

[0011] (6) Take the sensitized carbon black material described in step (5), add silver nitrate aqueous solution and stir, control the reaction temperature and reaction time, centrifuge and dry after the reaction to obtain carbon black material loaded with silver seeds for later use;

[0012] (7) Take the carbon black material loaded with silver seeds described in step (6), add silver ammonia solution and stir, then add formaldehyde solution dropwise, continue stirring and control pH and reaction temperature, filter, wash and dry after the reaction is completed to obtain conductive carbon black product.

[0013] As an improved technical solution, in step (1), carbon black and potassium hydroxide are added in a mass ratio of 1:3-4, the activation temperature is 550-650℃, and the activation time is 1-2h.

[0014] As an improved technical solution, the power of ion treatment in step (2) is 20-60W and the treatment time is 2-5min.

[0015] As an improved technical solution, the concentration of the aqueous solution of the nitrogen source compound in step (3) is 10-15 wt%, and the nitrogen source compound in the aqueous solution of the nitrogen source compound includes lysine or polyethyleneimine.

[0016] As an improved technical solution, in step (3), the porous carbon black material after plasma treatment is added to the aqueous solution of the nitrogen source compound at a ratio of 1:20-25, heated to 60-90℃, and stirred for 1-3 hours; then heat-treated at 450-550℃ for 1-2 hours under nitrogen protection.

[0017] As an improved technical solution, the surface-modified porous carbon black material in step (4) is mixed with the mixed amino acid solution at a mass-volume ratio of 1:2-3; the mixed amino acid solution is a solution of arginine, cysteine, glutamic acid and a pH 6.0 acetate-ammonium acetate buffer solution mixed at a mass-volume ratio of 2-4 mg:2-6 mg:2-4 mg:10-20 mL; the pH of the reaction system is adjusted to 6.0-6.5, heated to 50-60℃, and stirred for 20-40 min.

[0018] As an improved technical solution, in step (5), the carbon black material loaded with the mixed amino acid adsorption layer and the stannous chloride hydrochloric acid solution are added at a ratio of 1:15-20, the concentration of stannous chloride in the stannous chloride hydrochloric acid solution is 5-10 g / L, the sensitization temperature is 20-30℃, and the treatment time is 5-10 min.

[0019] As an improved technical solution, the concentration of the silver nitrate aqueous solution in step (6) is 10-15 g / L, and the sensitized carbon black material is mixed with the silver nitrate aqueous solution at a ratio of 1:12-15; the reaction temperature is controlled at 20-30℃ and the reaction time is 20-30 min.

[0020] As an improved technical solution, the concentration of the silver ammonia solution in step (7) is 0.01-0.03 mol / L, and the concentration of the formaldehyde solution is 0.1-0.2 mol / L; the pH is controlled at 9.5-10.5, the reaction temperature is 50-65℃, and the reaction time is 30-60 min.

[0021] After adopting the above technical solution, the beneficial effects of the present invention are:

[0022] This invention first chemically activates carbon black with potassium hydroxide, constructing well-developed microporous and mesoporous structures inside and on the surface of the carbon black particles, significantly increasing its specific surface area and porosity. This provides sufficient active sites and space for the introduction of functional groups, adsorption of amino acid molecules, and loading of silver nanoparticles in subsequent steps. Subsequently, low-temperature plasma treatment introduces oxygen-containing functional groups such as carboxyl, hydroxyl, and carbonyl groups onto the carbon black surface, improving the hydrophilicity and chemical activity of the carbon black surface and enhancing its interaction with subsequent composite amino acid solutions and metal ions.

[0023] Based on this, the present invention constructs a ternary mixed amino acid adsorption layer composed of arginine, cysteine, and glutamic acid. This adsorption layer has multiple functions: on the one hand, after the amino acid molecules are adsorbed on the carbon black surface, the dispersion stability of carbon black in the aqueous system is significantly improved through steric hindrance and electrostatic repulsion, effectively preventing particle agglomeration; on the other hand, the amino and carboxyl groups in the amino acid molecules and the thiol group unique to cysteine ​​can act as coordinating groups, interacting strongly with silver ions in subsequent steps, greatly increasing the adsorption amount and binding stability of silver ions on the carbon black surface. Among them, the thiol group of cysteine ​​forms a stable Ag-S chemical bond with silver ions, providing a molecular-level anchoring mechanism for the firm loading of the silver layer.

[0024] In the silver loading stage, this invention employs a two-step growth method to achieve precise and controllable construction of the silver layer. First, sensitized carbon black is added to an aqueous silver nitrate solution, utilizing the Sn adsorbed in the sensitized layer... 2+ Ag +The carbon black is reduced to fine silver seed crystals, which are uniformly loaded onto the surface and pores of the carbon black. Subsequently, the carbon black loaded with silver seed crystals is added to a silver ammonia solution. Under precisely controlled pH (9.5-10.5) and temperature (50-65℃) conditions, using formaldehyde as a reducing agent, silver ions are epitaxially grown on the seed crystal surface, forming a layer of silver nanoparticles with uniform particle size, dense distribution, and strong bonding to the matrix. Because the silver nanoparticles form highly efficient conductive pathways between the carbon black particles, and simultaneously, the amino acid adsorption layer optimizes the interfacial bonding state through the interaction of its functional groups with the carbon substrate and silver particles, thus significantly improving the conductivity of the carbon black product. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] Example 1

[0027] A method for preparing carbon black with improved conductivity includes the following steps:

[0028] (1) Take 100 mg of carbon black with a particle size of 50-60 nm (specific surface area of ​​140-160 m²). 2 / g), add solid potassium hydroxide at a mass ratio of 1:3, stir and mix well, then heat to 550℃ at a rate of 5℃ / min under nitrogen protection for 1 hour of activation treatment. Wash first with hydrochloric acid, then with deionized water until the filtrate is neutral and no potassium ions are detected (flame photometry). After drying, 94.7 mg of porous carbon black material (specific surface area 800-1000 m²) is obtained. 2 / g) for later use;

[0029] (2) Take 94.7 mg of porous carbon black material from step (1), and treat it with plasma (power is 20W, treatment time is 2min, working gas is carbon dioxide, gas flow rate is 20sccm) to obtain 93.6 mg of porous carbon black material after plasma treatment for later use.

[0030] (3) Take 93.6 mg of porous carbon black material after ion treatment in step (2), add it to a 10 wt% nitrogen source compound aqueous solution (lysine aqueous solution) at a material-to-liquid ratio of 1:20 (g:mL), heat to 60℃, stir for 1 h, filter, dry, and then heat treat at 450℃ for 1 h at a rate of 5℃ / min under nitrogen protection to obtain 97.8 mg of surface-modified porous carbon black material for later use;

[0031] (4) Take 97.8 mg of the surface-modified porous carbon black material from step (3), add it to a mixed amino acid solution (arginine, cysteine, glutamic acid and acetic acid-ammonium acetate buffer solution at pH 6.0 mixed in a mass-volume ratio of 2 mg:2 mg:2 mg:10 mL under nitrogen protection) at a mass-volume ratio of 1:2 (mg:ml), adjust the pH of the reaction system to 6.0, heat to 50°C under nitrogen protection, stir for 20 min, filter and dry to obtain 117.8 mg of carbon black material loaded with mixed amino acid adsorption layer for later use;

[0032] (5) Take 117.8 mg of carbon black material loaded with mixed amino acid adsorption layer in step (4), add freshly prepared stannous chloride hydrochloric acid solution with a concentration of 5 g / L at a material-to-liquid ratio of 1:15 (g:mL), control the pH of the reaction system to 1.5, stir and sensitize at 20℃ for 10 min under nitrogen protection, after sensitization, add 10 mL of hydrochloric acid solution with pH of 1.5 to the reaction system, ultrasonically disperse for 1 min to obtain a uniform suspension, then filter (remove liquid phase), wash (first rinse with hydrochloric acid with pH of 1.5, then rinse quickly with a small amount of deionized water), collect the solid phase and dry to obtain 121.5 mg of sensitized carbon black material for later use;

[0033] (6) Take 121.5 mg of the sensitized carbon black material in step (5), add silver nitrate aqueous solution with a concentration of 10 g / L at a material-to-liquid ratio of 1:12 (g:mL), stir, control the reaction temperature at 20℃, centrifuge after 20 min, collect the solid phase and dry to obtain 128.2 mg of carbon black material loaded with silver seeds for later use.

[0034] (7) Take 128.2 mg of carbon black material loaded with silver seeds in step (6), add 50 mL of silver ammonia solution with a concentration of 0.015 mol / L and stir, then add 10 mL of formaldehyde solution with a concentration of 0.1 mol / L, continue stirring and control the pH to 9.5, the reaction temperature to 50℃, and after reacting for 30 min, filter, wash and dry to obtain 146.1 mg of conductive carbon black product.

[0035] Example 2

[0036] A method for preparing carbon black with improved conductivity includes the following steps:

[0037] (1) Take 100 mg of carbon black with a particle size of 50-60 nm (specific surface area of ​​140-160 m²). 2 / g), add solid potassium hydroxide at a mass ratio of 1:3.5, stir and mix well, then heat to 600℃ at a rate of 5℃ / min under nitrogen protection for 1.5h activation treatment. After activation treatment, wash with hydrochloric acid and then wash with deionized water until neutral and no potassium ions are detected (flame photometry detection). 92.8mg of porous carbon black material (specific surface area 1000-1200m²) is obtained after drying. 2 / g) for later use;

[0038] (2) Take 92.8 mg of porous carbon black material from step (1), and treat it with plasma (power is 40W, treatment time is 3.5min, working gas is carbon dioxide, gas flow rate is 25sccm) to obtain 90.7 mg of porous carbon black material after plasma treatment for later use.

[0039] (3) Take 90.7 mg of porous carbon black material after ion treatment in step (2), add it to a 12 wt% nitrogen source compound aqueous solution (lysine aqueous solution) at a material-to-liquid ratio of 1:23 (g:mL), heat to 75℃, stir for 2 h, filter, dry, and then heat treat at 500℃ for 1.5 h at a rate of 5℃ / min under nitrogen protection to obtain 97.3 mg of surface-modified porous carbon black material for later use;

[0040] (4) Take 97.3 mg of the surface-modified porous carbon black material from step (3), add it to the mixed amino acid solution (arginine, cysteine, glutamic acid and acetic acid-ammonium acetate buffer solution at pH 6.0 mixed in a mass-volume ratio of 3 mg:4 mg:3 mg:15 mL under nitrogen protection) at a mass-volume ratio of 1:2.5 (mg:ml), adjust the pH of the reaction system to 6.3, heat to 55°C under nitrogen protection, stir for 30 min, filter and dry to obtain 124.8 mg of carbon black material loaded with mixed amino acid adsorption layer for later use;

[0041] (5) Take 124.8 mg of carbon black material loaded with mixed amino acid adsorption layer in step (4), add freshly prepared stannous chloride hydrochloric acid solution with a concentration of 8 g / L at a material-to-liquid ratio of 1:18 (g:mL), stir and sensitize at 25°C for 8 min under nitrogen protection, add 10 mL of hydrochloric acid solution with pH 1.5 to the reaction system after sensitization, and ultrasonically disperse for 1 min to obtain a uniform suspension. Then filter and wash (first rinse with hydrochloric acid with pH 1.5, and then rinse quickly with a small amount of deionized water). The collected solid phase is dried to obtain 129.2 mg of sensitized carbon black material for later use.

[0042] (6) Take 129.2 mg of the sensitized carbon black material in step (5), add silver nitrate aqueous solution with a concentration of 13 g / L at a material-to-liquid ratio of 1:15 (g:mL), stir, control the reaction temperature at 25℃, and after reacting for 25 min, centrifuge and dry to obtain 134.4 mg of carbon black material loaded with silver seeds for later use.

[0043] (7) Take 134.4 mg of carbon black material loaded with silver seeds in step (6), add 55 ml of silver ammonia solution with a concentration of 0.023 mol / L and stir, then add 10 ml of formaldehyde solution with a concentration of 0.15 mol / L, continue stirring and control the pH to 10, the reaction temperature to 58℃, and after reacting for 45 min, filter, wash and dry to obtain 153.2 mg of conductive carbon black product.

[0044] Example 3

[0045] A method for preparing carbon black with improved conductivity includes the following steps:

[0046] (1) Take 100 mg of carbon black with a particle size of 50-60 nm (specific surface area of ​​140-160 m²). 2 Add potassium hydroxide at a mass ratio of 1:4, stir and mix well, then heat to 650℃ at a rate of 5℃ / min under nitrogen protection for 2 hours for activation treatment. After activation treatment, wash with hydrochloric acid and then wash with deionized water until neutral and no potassium ions are detected (flame photometry). After drying, 91.2 mg of porous carbon black material (specific surface area 1200-1300 m²) is obtained. 2 / g) for later use;

[0047] (2) Take 91.2 mg of porous carbon black material from step (1), and treat it with plasma (power is 60W, treatment time is 5min, working gas is carbon dioxide, gas flow rate is 20sccm) to obtain 88.4 mg of porous carbon black material after plasma treatment for later use.

[0048] (3) Take 88.4 mg of porous carbon black material after ion treatment in step (2), add it to a 15 wt% nitrogen source compound aqueous solution (polyethyleneimine aqueous solution) at a material-to-liquid ratio of 1:25 (g:mL), heat to 90℃, stir for 3 h, filter, dry, and then heat to 550℃ at a rate of 5℃ / min under nitrogen protection for 2 h to obtain 108.9 mg of surface-modified porous carbon black material for later use;

[0049] (4) Take 108.9 mg of the surface-modified porous carbon black material from step (3), add it to a mixed amino acid solution (arginine, cysteine, glutamic acid and acetic acid-ammonium acetate buffer solution at pH 6.0 mixed in a mass-volume ratio of 4 mg: 6 mg: 4 mg: 20 mL under nitrogen protection) at a mass-volume ratio of 1:3 (mg: mL), adjust the pH of the reaction system to 6.5, heat to 60°C under nitrogen protection, stir for 40 min, filter and dry to obtain 144.3 mg of carbon black material loaded with mixed amino acid adsorption layer for later use;

[0050] (5) Take 144.3 mg of carbon black material loaded with mixed amino acid adsorption layer in step (4), add freshly prepared stannous chloride hydrochloric acid solution with a concentration of 10 g / L at a material-to-liquid ratio of 1:20 (g:mL), stir and sensitize at 30°C for 10 min under nitrogen protection, add 10 mL of hydrochloric acid solution with pH 1.5 to the reaction system after sensitization, and ultrasonically disperse for 1 min to obtain a uniform suspension. Then filter and wash (first rinse with hydrochloric acid with pH 1.5, and then rinse quickly with a small amount of deionized water). The collected solid phase is dried to obtain 149.6 mg of sensitized carbon black material for later use.

[0051] (6) Take 149.6 mg of the sensitized carbon black material in step (5), add silver nitrate aqueous solution with a concentration of 15 g / L at a material-to-liquid ratio of 1:13 (g:mL), stir, control the reaction temperature at 30℃, and after reacting for 30 min, centrifuge and dry to obtain 155.9 mg of carbon black material loaded with silver seeds for later use.

[0052] (7) Take 155.9 mg of carbon black material loaded with silver seeds in step (6), add 60 ml of silver ammonia solution with a concentration of 0.03 mol / L and stir, then add 10 ml of formaldehyde solution with a concentration of 0.2 mol / L, continue stirring and control the pH to 10.5, the reaction temperature to 65℃, and after reacting for 60 min, filter, wash and dry to obtain 178.2 mg of conductive carbon black product.

[0053] To better demonstrate that the process of this invention can prepare highly conductive carbon black products, a comparative example was set up with Example 2 as a reference. The DBP oil absorption values ​​of the samples from Examples 1-3 and the comparative example were measured according to the national standard GB / T3780.2-2003 "Carbon Black Part 2: Determination of Dibutyl Phthalate Absorbance"; the resistivity of the above samples was measured according to the national standard GB / T3781.9-2006 "Acetylene Black Part 9: Determination of Resistivity". Specific results are shown in Table 1.

[0054] Comparative Example 1

[0055] Unlike Example 2, the activation temperature in step (1) was 700°C, resulting in a porous carbon black material with a surface area of ​​1200-1350 m². 2 / g, the rest of the operations are the same.

[0056] Comparative Example 2

[0057] Unlike Example 2, step (2) is missing; the rest of the operations are the same.

[0058] Comparative Example 3

[0059] Unlike Example 2, step (3) is missing; the rest of the operations are the same.

[0060] Comparative Example 4

[0061] Unlike Example 2, step (4) is missing; the rest of the operations are the same.

[0062] Comparative Example 5

[0063] Unlike Example 2, the mixed amino acid solution in step (4) was prepared by mixing arginine, glutamic acid and a pH 6.0 acetate-ammonium acetate buffer solution in a mass-volume ratio of 3 mg:3 mg:15 mL; the rest of the operation was the same.

[0064] Comparative Example 6

[0065] Unlike Example 2, step (5) sensitization treatment and step (6) silver seed loading are not performed. Instead, the carbon black material loaded with the mixed amino acid adsorption layer in step (4) is directly added to the silver ammonia solution, and formaldehyde solution is added dropwise for chemical silver plating. All other operations are the same.

[0066] Comparative Example 7

[0067] Unlike Example 2, in step (4), after mixing the surface-modified porous carbon black material and the mixed amino acid solution, the pH was adjusted to 5.5, and the rest of the operations were the same.

[0068] Comparative Example 8

[0069] Unlike Example 2, in step (4), after mixing the surface-modified porous carbon black material and the mixed amino acid solution, the pH was adjusted to 7, and the rest of the operations were the same.

[0070] Comparative Example 9

[0071] Unlike Example 2, in step (4), the temperature is raised to 45°C, while the rest of the operation is the same.

[0072] Comparative Example 10

[0073] Unlike Example 2, in step (4), the temperature is raised to 65°C, while the rest of the operation is the same.

[0074]

[0075] The data in Table 1 shows that the carbon black product prepared using the process method of Example 2 of the present invention has better overall conductivity than other examples and comparative examples.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing carbon black with improved conductivity, characterized in that, The preparation method includes the following steps: (1) Take carbon black with a particle size of 50-60nm, add solid potassium hydroxide, stir and mix well, and then activate it under nitrogen protection. After the activation treatment is completed, wash the filtrate until it is neutral and no potassium ions are detected. Dry the porous carbon black material for later use. (2) Take the porous carbon black material described in step (1), and treat it with plasma to obtain the plasma-treated porous carbon black material for later use. (3) Take the porous carbon black material after plasma treatment in step (2), add an aqueous solution of nitrogen source compound, heat and stir, filter, dry and then heat treat to obtain surface-modified porous carbon black material for later use. (4) Take the surface-modified porous carbon black material described in step (3), add a mixed amino acid solution, adjust the pH, heat, stir, filter, and dry to obtain carbon black material loaded with a mixed amino acid adsorption layer for later use. (5) Take the carbon black material loaded with the mixed amino acid adsorption layer in step (4), add stannous chloride hydrochloric acid solution and stir to carry out sensitization treatment. After the sensitization treatment is completed, filter, wash and dry to obtain the sensitized carbon black material for later use. (6) Take the sensitized carbon black material described in step (5), add silver nitrate aqueous solution and stir, control the reaction temperature and reaction time, centrifuge and dry after the reaction to obtain carbon black material loaded with silver seeds for later use; (7) Take the carbon black material loaded with silver seeds described in step (6), add silver ammonia solution and stir, then add formaldehyde solution dropwise, continue stirring and control pH and reaction temperature, filter, wash and dry after the reaction is completed to obtain conductive carbon black product.

2. The method for preparing carbon black with improved conductivity according to claim 1, characterized in that, In step (1), carbon black and potassium hydroxide are added in a mass ratio of 1:3-4. The activation temperature is 550-650℃ and the activation time is 1-2h.

3. The method for preparing carbon black with improved conductivity according to claim 1, characterized in that, In step (2), the power of the ion treatment is 20-60W and the treatment time is 2-5min.

4. The method for preparing carbon black with improved conductivity according to claim 1, characterized in that, The concentration of the aqueous solution of the nitrogen source compound in step (3) is 10-15 wt%, and the nitrogen source compound in the aqueous solution includes lysine or polyethyleneimine.

5. The method for preparing carbon black with improved conductivity according to claim 1, characterized in that, In step (3), the plasma-treated porous carbon black material and the aqueous solution of the nitrogen source compound are added at a ratio of 1g:20-25mL, heated to 60-90℃, and stirred for 1-3h; then heat-treated at 450-550℃ for 1-2h under nitrogen protection.

6. The method for preparing carbon black with improved conductivity according to claim 1, characterized in that, The surface-modified porous carbon black material described in step (4) is mixed with the mixed amino acid solution at a mass-volume ratio of 1 mg: 2-3 mL; the mixed amino acid solution is a solution composed of arginine, cysteine, glutamic acid and a pH 6.0 acetate-ammonium acetate buffer solution at a mass-volume ratio of 2-4 mg: 2-6 mg: 2-4 mg: 10-20 mL; the pH of the reaction system is adjusted to 6.0-6.5, heated to 50-60℃, and stirred for 20-40 min.

7. The method for preparing carbon black with improved conductivity according to claim 1, characterized in that, In step (5), the carbon black material loaded with the mixed amino acid adsorption layer and the stannous chloride hydrochloric acid solution are added at a ratio of 1g:15-20mL. The concentration of stannous chloride in the stannous chloride hydrochloric acid solution is 5-10g / L. The sensitization treatment temperature is 20-30℃ and the treatment time is 5-10min.

8. The method for preparing carbon black with improved conductivity according to claim 1, characterized in that, In step (6), the concentration of the silver nitrate aqueous solution is 10-15 g / L. The sensitized carbon black material is mixed with the silver nitrate aqueous solution at a ratio of 1 g: 12-15 mL. The reaction temperature is controlled at 20-30℃ and the reaction time is 20-30 min.

9. The method for preparing carbon black with improved conductivity according to claim 1, characterized in that, In step (7), the concentration of the silver ammonia solution is 0.01-0.03 mol / L, and the concentration of the formaldehyde solution is 0.1-0.2 mol / L; the pH is controlled at 9.5-10.5, the reaction temperature is 50-65℃, and the reaction time is 30-60 min.

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