Conductive carbon black compositions, conductive carbon black slurries, and methods of making and using the same

Abstract

The present application provides a kind of electrically conductive carbon black composition and electrically conductive carbon black slurry.The composition of the present application includes carbon black and admixture, the carbon black includes high structure carbon black and negative pressure carbon black.The electrically conductive carbon black slurry prepared by using the composition can greatly reduce the amount of admixture, shorten the grinding time, and the electrically conductive carbon black slurry obtained has good dispersibility, few bubbles, high stability, the coating film is more smooth and uniform, and has good conductive performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of conductive material, in particular to a conductive carbon black composition, a conductive carbon black slurry and a preparation method and application thereof. BACKGROUND

[0002] High-structure conductive carbon black has the characteristics of small particle size, large specific surface area, high structure, low or high resistance, and can impart conductive or anti-static properties to products, and is widely used in the fields of conductive, electromagnetic shielding, anti-static, etc. in various industrial sectors such as electronics, electromechanical, communication, printing, aerospace, weapons, etc.

[0003] The conventional carbon black organic slurry process is to pre-mix high-structure carbon black, carbon nanotubes and graphene and other carbon nanomaterials in an organic solvent, and then further grind to achieve the specified fineness and dispersion performance. In order to achieve good dispersion and stability, more dispersants and defoamers are added, and the grinding time is also relatively long. More dispersants and defoamers are equivalent to introducing impurities, which will have a certain degree of negative impact on the application performance of the slurry; longer grinding time not only increases the production cost, but also may cause over-processing in fineness, which in turn affects the application performance of the slurry. SUMMARY

[0004] In order to solve one of the above technical problems in the prior art, the present application provides a conductive carbon black composition, a conductive carbon black slurry and a preparation method of the conductive carbon black slurry. The conductive carbon black composition of the present application can be used to prepare a conductive carbon black slurry, and the amount of dispersants and defoamers can be greatly reduced during the preparation process, the grinding time is shortened, and the obtained conductive carbon black slurry has good dispersion, less bubbles, high stability, smoother and more uniform coating film and good conductive performance.

[0005] In a first aspect, the present application provides a conductive carbon black composition comprising carbon black and additives, wherein the carbon black comprises high-structure carbon black and negative pressure carbon black.

[0006] The "negative pressure carbon black" of the present application refers to carbon black prepared under negative pressure (lower than atmospheric pressure) conditions, relative to the existing carbon black preparation process under positive pressure (equal to or higher than atmospheric pressure) conditions. The microstructure and performance of the negative pressure carbon black of the present application are significantly different from those of the carbon black prepared under positive pressure conditions. The present application found that by adding a small amount of negative pressure carbon black to high-structure carbon black, the dispersion of high-structure carbon black in organic solvents can be significantly improved, the amount of additives such as dispersants and defoamers can be greatly reduced, the grinding time can be significantly reduced, the stability of the conductive carbon black slurry can be enhanced, and the conductive performance of the final product using the conductive carbon black slurry is not affected.

[0007] In some embodiments, the mass ratio of the negative pressure carbon black to the high structure carbon black is 1:(4-200), for example, 1:4, 1:10, 1:15, 1:20, 1:30, 1:36, 1:50, 1:80, 1:100, 1:110, 1:150, 1:180, 1:200, or any value therebetween. In some preferred embodiments, the mass ratio of the negative pressure carbon black to the high structure carbon black is 1:(15-110). In some more preferred embodiments, the mass ratio of the negative pressure carbon black to the high structure carbon black is 1:(36-110).

[0008] In some embodiments, the negative pressure carbon black is prepared at an absolute pressure of 0.003-0.025 MPa, for example, 0.003 MPa, 0.005 MPa, 0.008 MPa, 0.01 MPa, 0.012 MPa, 0.015 MPa, 0.018 MPa, 0.02 MPa, 0.022 MPa, 0.025 MPa.

[0009] In some embodiments, the particle size of the negative pressure carbon black is 25-80 nm, preferably 30-60 nm.

[0010] The preparation of the carbon black according to the present application can be performed using conventional methods in the art, for example, contact method, furnace method, thermal cracking method, acetylene method, etc., under negative pressure conditions.

[0011] In some embodiments, the negative pressure carbon black is prepared by the furnace method, and the preparation comprises the following steps:

[0012] The raw oil containing anthracene oil is heated and vaporized, mixed with a diluent, and then introduced into a reaction furnace to perform a reaction under negative pressure conditions to obtain the negative pressure carbon black. In some embodiments, the reaction is performed at a pressure of 0.003-0.025 MPa. In some embodiments, the reaction is performed at a pressure of 0.005-0.015 MPa.

[0013] In some embodiments, the raw oil further contains aromatic oil, and the aromatic oil preferably includes at least one of toluene and naphthalene. In some embodiments, the raw oil includes anthracene oil and toluene. In some embodiments, the raw oil includes anthracene oil, toluene, and naphthalene. In some embodiments, the mass percentage of the aromatic oil in the raw oil is not more than 1%.

[0014] In some embodiments, the diluent includes at least one of an inert gas and nitrogen, preferably argon or nitrogen.

[0015] In some embodiments, the furnace temperature of the reaction furnace is 1000-2000°C. In some embodiments, the furnace temperature of the reaction furnace is 1100-1600°C, preferably 1200-1500°C.

[0016] In the present application, in order to adjust the furnace temperature and the reaction yield, the carbon / oxygen ratio (C / O) in the reaction system is preferably 0.6% to 1.5%.

[0017] In the present application, after the preparation of the negative pressure carbon black, the floating scum is preferably removed by air floatation, and then the negative pressure carbon black is filtered, dried, and then used in combination with other raw materials. The dispersing and stabilizing performance of the negative pressure carbon black after removal of the floating scum can be more effectively utilized. The operation of the air floatation method includes: mixing the negative pressure carbon black with 20 times the amount of deionized water, blowing pure air while stirring, and standing, so that the negative pressure carbon black forms a precipitate.

[0018] In some embodiments, the water content of the negative pressure carbon black is ≤0.3%.

[0019] In some embodiments, the oil absorption value of the high-structure carbon black is 450×10 -5 to 550×10 -5 m 3 / kg.

[0020] In some embodiments, the water content of the high-structure carbon black is ≤0.3%.

[0021] In some embodiments, the admixture includes at least one of a dispersant, a solvent, and a conductive filler. In some embodiments, the admixture includes a dispersant, a solvent, and a conductive filler.

[0022] Optionally, the admixture of the present application further includes a defoaming agent. In some embodiments, the admixture includes a dispersant, a solvent, a conductive filler, and a defoaming agent.

[0023] In some embodiments, the composition includes a high-structure carbon black, a negative pressure carbon black, a conductive filler, a dispersant, a solvent, and optionally a defoaming agent.

[0024] In some embodiments, the content of the high-structure carbon black is 2wt% to 20wt%, for example 2wt%, 5wt%, 8wt%, 10wt%, 15wt%, 18wt%, 20wt%, or any value therebetween, based on the total weight of the composition being 100%.

[0025] In some embodiments, the content of the negative pressure carbon black is 0.1wt% to 0.5wt%, for example 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, or any value therebetween, based on the total weight of the composition being 100%.

[0026] In some embodiments, the conductive filler content is 0.1 wt% to 1.0 wt% based on 100% of the total weight of the composition, for example 0.1 wt%, 0.2 wt%, 0.4 wt%, 0.6 wt%, 0.8 wt%, 1.0 wt%, or any value between them.

[0027] The present invention does not impose a special limitation on the amount of dispersant used, and those skilled in the art can adjust it according to actual needs. In some embodiments, the content of the dispersant is 0.5wt% to 2.0wt% based on 100% of the total weight of the composition, for example, 0.5wt%, 0.8wt%, 1.0wt%, 1.2wt%, 1.5wt%, 1.8wt%, 2.0wt%, or any value between them.

[0028] In some embodiments, the solvent content is 76.45 wt% to 97.3 wt% based on 100% of the total weight of the composition, for example 77 wt%, 80 wt%, 85 wt%, 90 wt%, 95 wt%, 97.3 wt%, or any value between them.

[0029] The present invention does not impose any particular limitation on the amount of defoamer used, and those skilled in the art can adjust it according to actual needs. In some embodiments, the content of the defoamer is 0 wt% to 0.05 wt%, for example, 0 wt%, 0.01 wt%, 0.02 wt%, 0.03 wt%, 0.04 wt%, 0.05 wt%, or any value between them, based on the total weight of the composition (100%).

[0030] In some preferred embodiments, the composition comprises, by weight percentage: 2 wt% to 20 wt% high-structure carbon black, 0.1 wt% to 0.5 wt% negative pressure carbon black, 0.1 wt% to 1.0 wt% conductive filler, 0.5 wt% to 2.0 wt% dispersant, 0 wt% to 0.05 wt% defoamer, with the balance being solvent.

[0031] The solvent described in this invention includes at least one of water and an organic solvent. An organic solvent is preferred. The organic solvent described in this invention includes, but is not limited to, N-methylpyrrolidone, N,N-dimethylformamide, etc.

[0032] The addition of conductive fillers can further enhance the conductivity of the prepared conductive carbon black slurry. In some embodiments, the conductive filler is selected from carbon-based conductive materials, preferably at least one of carbon nanotubes, graphene, graphite, and carbon fibers, and more preferably carbon nanotubes. Preferably, the diameter of the carbon nanotubes is 5–20 nm. Preferably, the length of the carbon nanotubes is 5–100 μm.

[0033] The present invention does not impose any particular limitation on the types of dispersants and defoamers mentioned herein; any dispersants and defoamers known in the art can be used to achieve the technical effects of the present invention. The dispersant includes, but is not limited to, polymeric dispersants, preferably polyvinylpyrrolidone (PVP). In this invention, the PPVP can be anionic, nonionic, or a combination of anionic and nonionic PPVP dispersants. The defoamer includes, but is not limited to, silicone defoamers such as dimethyl silicone oil.

[0034] In a second aspect, the present invention provides a conductive carbon black slurry, which is prepared from raw materials comprising the composition described in the first aspect of the present invention.

[0035] Thirdly, the present invention provides a method for preparing the conductive carbon black slurry described in the second aspect, comprising the following steps:

[0036] The carbon black raw material, including the high-structure carbon black and negative pressure carbon black, is mixed with conductive filler, dispersant, and organic solvent and then ground. Optionally, an antifoaming agent is added before grinding.

[0037] In this invention, it is preferable to first dry the high-structure carbon black at a temperature of 120-130°C until the moisture content is ≤0.3% before mixing it with other raw materials.

[0038] The grinding process described in this invention preferably employs a sand mill. Preferably, grinding media, such as zirconium beads, with a preferred particle size of 0.6–0.8 mm, are added during grinding. The amount of zirconium beads added is 2.0–2.5 kg / L, depending on the volume of the grinding chamber. The degree of grinding is primarily determined by the good dispersion of conductive fillers, such as carbon nanotubes. Specifically, if the slurry can quickly and uniformly diffuse in a ribbon-like pattern when dropped into clear water, it is considered to have good dispersion performance; if it does not separate or agglomerate after standing for 90 days after grinding, it is considered a qualified product; if it does not separate or agglomerate after standing for 180 days, it is considered a superior product. There is no strict requirement for the fineness of the carbon black after grinding. If a finer fineness is required, the grinding time can be appropriately extended, or a smaller particle size grinding media, such as zirconium beads with a particle size of 0.4–0.6 mm, can be used. However, excessively fine grinding media can lead to increased pressure in the grinding chamber and decreased production efficiency. Therefore, zirconium beads with a particle size ≤0.6 mm are preferred as the grinding media.

[0039] In some embodiments, the grinding temperature is 10–20°C. Grinding raises the temperature of the material, and low-temperature grinding can reduce solvent evaporation.

[0040] In some embodiments, the grinding time is 20 to 30 minutes.

[0041] Fourthly, the present invention provides the application of the carbon black composition described in the first aspect or the conductive carbon black slurry described in the second aspect in battery materials, electromagnetic wave shielding materials, and electronic component coating materials.

[0042] The conductive carbon black composition and conductive carbon black slurry of this invention can be used in batteries, especially lithium-ion batteries, electromagnetic wave shielding coatings, and coating materials for antistatic electronic components.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] (1) After adding negative pressure carbon black, the prepared conductive carbon black slurry has good dispersibility and fewer bubbles, saving more than 50% of dispersant and defoamer, or even no need to add defoamer, and reducing grinding time by more than 30%.

[0045] (2) It has good stability and does not separate or agglomerate even after being left to stand for more than 180 days.

[0046] (3) The coating is smoother and more uniform.

[0047] (4) The slurry has good electrical conductivity. Detailed Implementation

[0048] 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. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way.

[0049] The high-structure carbon black used in the following examples has an oil absorption value of 450 × 10⁻⁶. -5 ~550×10 -5 m 3 / kg.

[0050] The preparation method of the negative pressure carbon black used in the following examples is as follows:

[0051] Anthracene oil and toluene are mixed in a certain proportion, vaporized in an oil bath, diluted with argon or nitrogen, and then introduced into a reaction furnace with pure oxygen for combustion. The absolute pressure inside the furnace is controlled at 0.003–0.025 MPa, the furnace temperature at 1200–1500℃, and the C / O ratio at 0.6%–1.5%.

[0052] The dispersant used is polyvinylpyrrolidone, and the defoamer is dimethyl silicone oil.

[0053] The raw materials and weight percentages used in the conductive carbon black slurries prepared in Examples 1-5 and Comparative Examples 1-2 are shown in Table 1.

[0054] Table 1

[0055]

[0056] Example 1

[0057] The sand mill has an inner volume of 10L. It is filled with 22kg of zirconium beads with a particle size of 0.6–0.8mm. The cooling water inlet temperature is ≤15℃. 175kg of NMP is weighed and pumped into the mixing tank. The disperser speed is set to 300rpm. 22kg of high-structure carbon black, 0.6kg of negative-pressure carbon black, 0.5kg of carbon nanotubes, and 1.4kg of dispersant are weighed and slowly poured into the mixing tank. After initial mixing for 2 minutes, the disperser speed is adjusted to 800rpm and mixing continues for 5 minutes until the mixture is relatively uniform. Mixing is stopped, and the premixed slurry is pumped into the sand mill using a pneumatic pump. The sand mill feed rate is set to 30L / min, and the main motor speed is set to 1000rpm. Two high-density polyethylene plastic buckets are used alternately as the feed and discharge buckets. Dispersion is basically achieved after 15 minutes, and good dispersion is achieved after 20 minutes. Grinding is then stopped.

[0058] Example 2

[0059] The only difference from Example 1 is that the amount of negative pressure carbon black used is 0.2 kg.

[0060] The sand mill has an inner volume of 10L. It is filled with 22kg of zirconium beads with a particle size of 0.6–0.8mm. The cooling water in the sand mill is turned on, with an inlet water temperature ≤15℃. 175kg of NMP is weighed and pumped into the mixing tank. The dispersant speed is set to 300rpm. 22kg of high-structure carbon black, 0.2kg of negative-pressure carbon black, 0.5kg of carbon nanotubes, and 1.4kg of dispersant are weighed and slowly poured into the mixing tank. After initial mixing for 2 minutes, the dispersant speed is adjusted to 800rpm and mixing continues for 5 minutes until the mixture is relatively uniform. Mixing is stopped, and the premixed slurry is pumped into the sand mill using a pneumatic pump for grinding. The sand mill feed rate is set to 30L / min, and the main motor speed is set to 1000rpm. Two high-density polyethylene plastic buckets are used alternately as the feed and discharge buckets. The dispersibility is basically up to standard after 20 minutes, and good after 25 minutes. Grinding is then stopped.

[0061] Example 3

[0062] The only difference from Example 1 is that the amount of negative pressure carbon black used is 1 kg.

[0063] The sand mill has an inner volume of 10L. It is filled with 22kg of zirconium beads with a particle size of 0.6–0.8mm. The cooling water inlet temperature is ≤15℃. 175kg of NMP is weighed and pumped into the mixing tank. The disperser speed is set to 300rpm. 22kg of high-structure carbon black, 1kg of negative-pressure carbon black, 0.5kg of carbon nanotubes, and 1.4kg of dispersant are weighed and slowly poured into the mixing tank. After initial mixing for 2 minutes, the disperser speed is adjusted to 800rpm and mixing continues for 5 minutes until the mixture is relatively uniform. Mixing is stopped, and the premixed slurry is pumped into the sand mill using a pneumatic pump. The sand mill feed rate is set to 30L / min, and the main motor speed is set to 1000rpm. Two high-density polyethylene plastic buckets are used alternately as the feed and discharge buckets. Dispersion is basically achieved after 15 minutes, and good dispersion is achieved after 20 minutes. Grinding is then stopped.

[0064] Example 4

[0065] The only difference from Example 1 is that the amount of high-structure carbon black used is 10 kg.

[0066] The sand mill has an inner volume of 10L and is filled with 22kg of zirconium beads with a particle size of 0.6-0.8mm. The cooling water inlet temperature is ≤15℃. 175kg of NMP is weighed and pumped into the mixing tank, with the disperser set to a stirring speed of 300rpm. 10kg of high-structure carbon black, 0.6kg of negative-pressure carbon black, 0.5kg of carbon nanotubes, and 1.4kg of dispersant are weighed and slowly poured into the mixing tank. After initial mixing for 2 minutes, the disperser speed is adjusted to 800rpm and mixing continues for 5 minutes until the mixture is relatively uniform. Mixing is stopped, and the premixed slurry is pumped into the sand mill using a pneumatic pump for grinding. The sand mill feed rate is set to 30L / min, and the main motor speed is set to 1000rpm. Two high-density polyethylene plastic buckets are used alternately as the feed and discharge buckets. Grinding is stopped after 15 minutes when the dispersibility is basically satisfactory and after 20 minutes when the dispersibility is good.

[0067] Example 5

[0068] The only difference from Example 1 is that the amount of high-structure carbon black used is 40 kg.

[0069] The sand mill has an inner volume of 10L and is filled with 22kg of zirconium beads with a particle size of 0.6-0.8mm. The cooling water inlet temperature is ≤15℃. 175kg of NMP is weighed and pumped into the mixing tank, with the disperser set to a stirring speed of 300rpm. 40kg of high-structure carbon black, 0.6kg of negative-pressure carbon black, 0.5kg of carbon nanotubes, and 1.4kg of dispersant are weighed and slowly poured into the mixing tank. After initial mixing for 2 minutes, the disperser speed is adjusted to 800rpm and mixing continues for 5 minutes until the mixture is relatively uniform. Mixing is stopped, and the premixed slurry is pumped into the sand mill using a pneumatic pump for grinding. The sand mill feed rate is set to 30L / min, and the main motor speed is set to 1000rpm. Two high-density polyethylene plastic buckets are used alternately as the feed and discharge buckets. Grinding is stopped after 15 minutes when the dispersibility is basically satisfactory and after 20 minutes when the dispersibility is good.

[0070] Comparative Example 1

[0071] The sand mill has an inner volume of 10L and is filled with 22kg of zirconium beads with a particle size of 0.6-0.8mm. The cooling water inlet of the sand mill is turned on, with a water temperature ≤15℃. 175kg of N-methylpyrrolidone (NMP) organic solvent is weighed and pumped into the mixing tank. The dispersant speed is set to 300rpm. 22kg of high-structure carbon black, 0.5kg of carbon nanotubes, and 3.2kg of dispersant are weighed and slowly poured into the mixing tank. After initial mixing for 2 minutes, the dispersant speed is adjusted to 800rpm and mixing continues for 5 minutes until the mixture is relatively uniform. 0.1kg of defoamer is added during the mixing process. Mixing is stopped, and the premixed slurry is pumped into the sand mill using a pneumatic pump for grinding. The sand mill feed rate is set to 30L / min, and the main motor speed is set to 1000rpm. Two high-density polyethylene plastic buckets are used alternately as the feed and discharge buckets. Grinding is stopped after 20 minutes when the dispersibility is basically satisfactory and after 30 minutes when the dispersibility is good.

[0072] Comparative Example 2

[0073] The sand mill has an inner volume of 10L. It is filled with 22kg of zirconium beads with a particle size of 0.6–0.8mm. The cooling water inlet temperature is ≤15℃. 175kg of NMP is weighed and pumped into the mixing tank. The disperser speed is set to 300rpm. 22kg of high-structure carbon black, 0.5kg of carbon nanotubes, and 1.4kg of dispersant are weighed and slowly poured into the mixing tank. After initial mixing for 2 minutes, the disperser speed is adjusted to 800rpm and mixing continues for 5 minutes until the mixture is relatively uniform. 0.1kg of defoamer is added during the mixing process. Mixing is stopped, and the premixed slurry is pumped into the sand mill using a pneumatic pump for grinding. The sand mill feed rate is set to 30L / min, and the main motor speed is set to 1000rpm. Two high-density polyethylene plastic drums are used alternately as the feed and discharge drums. The dispersibility was not up to standard after 20 minutes and 30 minutes. After adding 0.6 kg of dispersant, the dispersibility was still not up to standard by 45 minutes (sample retained). After adding another 0.6 kg of dispersant, the dispersibility was basically up to standard by 60 minutes. However, the dispersibility could not be improved further by 80 minutes, so grinding was stopped.

[0074] Comparative Example 3

[0075] The only difference from Example 1 is the preparation pressure of the "negative pressure carbon black," and the specific method is as follows:

[0076] Anthracene oil and toluene are mixed in a certain proportion, vaporized in an oil bath, diluted with argon or nitrogen, and then introduced into a reaction furnace with pure oxygen for combustion. The absolute pressure inside the furnace is controlled at 0.05 MPa, the furnace temperature at 1200–1500 °C, and the C / O ratio at 0.6%–1.5%.

[0077] The grinding time, stability, and film-forming properties of the high-structure carbon black organic slurries prepared in Examples 1-5 and Comparative Examples 1-3 are shown in Table 2.

[0078] Table 2

[0079]

[0080] The results showed that the high-structure carbon black organic slurries prepared in Comparative Examples 1 and 2 were difficult to disperse without the addition of negative pressure carbon black, requiring a significant increase in the amount of dispersant and grinding time to achieve a better dispersion effect. Comparative Example 3 used carbon black prepared under an absolute pressure of 0.05 MPa. Compared with the product without negative pressure carbon black, the product's dispersibility was improved to some extent, but slight stratification and minor cracking of the coating occurred after prolonged storage, possibly due to insufficient negative pressure causing a difference in carbon black performance compared to carbon black prepared under 0.003–0.025 MPa. In Examples 1–5, the addition of a small amount of negative pressure carbon black significantly improved the dispersibility of high-structure carbon black in organic solvents, greatly reducing the amount of dispersant and defoamer, and significantly reducing grinding time, while maintaining good dispersibility and stability, and producing a smoother and more uniform coating. A mass ratio of approximately 1:37 between negative pressure carbon black and conductive carbon black was sufficient to achieve good results, and there was no need to further increase the proportion of negative pressure carbon black. However, it should be noted that too little negative pressure carbon black will affect the product's dispersibility and stability.

[0081] The technical solutions of the present invention are not limited to the specific embodiments described above. Any technical modifications made in accordance with the technical solutions of the present invention fall within the protection scope of the present invention.

Claims

1. A conductive carbon black composition comprising carbon black and an additive, wherein the carbon black comprises high-structure carbon black and negative pressure carbon black, and the mass ratio of the negative pressure carbon black to the high-structure carbon black is 1:(4~200). The negative pressure carbon black is prepared under an absolute pressure of 0.003~0.025 MPa; The particle size of the negative pressure carbon black is 25~80nm; The moisture content of the negative pressure carbon black is ≤0.3%; The preparation of the negative pressure carbon black includes the following steps: The raw material oil containing anthracene oil is heated and vaporized, mixed with a diluent, and then introduced into a reactor. The reaction is carried out under negative pressure to obtain negative pressure carbon black. The reaction pressure is 0.003~0.025 MPa; The furnace temperature of the reactor is 1000~2000℃; The carbon-to-oxygen ratio (C / O) in the reaction system is 0.6%~1.5%; The raw material oil also contains aromatic oil; The diluent includes at least one of an inert gas and nitrogen. The additives include dispersants, solvents, and conductive fillers; The solvent is an organic solvent, and the organic solvent is at least one of N-methylpyrrolidone and N,N-dimethylformamide; The dispersant is polyvinylpyrrolidone; The conductive filler is a carbon nanotube; Based on the total weight of the composition (100%), the content of the high-structure carbon black is 2wt%~20wt%, the content of the negative pressure carbon black is 0.1wt%~0.5wt%, the content of the conductive filler is 0.1wt%~1.0wt%, the content of the dispersant is 0.5wt%~2.0wt%, and the content of the solvent is 76.45wt%~97.3wt%.

2. The composition according to claim 1, characterized in that, The mass ratio of the negative pressure carbon black to the high-structure carbon black is 1:(36~110).

3. The composition according to claim 1, characterized in that, The particle size of the negative pressure carbon black is 30~60nm.

4. The composition according to claim 1, characterized in that, The reaction pressure is 0.005~0.015 MPa.

5. The composition according to claim 1, characterized in that, The furnace temperature of the reactor is 1100~1600℃.

6. The composition according to claim 1, characterized in that, The furnace temperature of the reactor is 1200~1500℃.

7. The composition according to claim 1, characterized in that, The aromatic oil is at least one of toluene and naphthalene.

8. The composition according to claim 1, characterized in that, The diluent is argon or nitrogen.

9. The composition according to any one of claims 1-8, characterized in that, The oil absorption value of the high-structure carbon black is 450 × 10⁻⁶. -5 ~550×10 -5 m 3 / kg; The moisture content of the high-structure carbon black is ≤0.3%.

10. The composition according to claim 1, characterized in that, The additives also include defoamers.

11. The composition according to claim 10, characterized in that, The composition includes high-structure carbon black, negative pressure carbon black, conductive filler, dispersant, solvent and optional defoamer; The content of the defoamer is 0 wt% to 0.05 wt% based on the total weight of the composition (100%).

12. The composition according to claim 10, characterized in that, The composition includes high-structure carbon black, negative pressure carbon black, conductive filler, dispersant, solvent and optional defoamer; Based on the total weight of the composition (100%), the composition comprises the following components: 2wt%~20wt% high-structure carbon black, 0.1wt%~0.5wt% negative pressure carbon black, 0.1wt%~1.0wt% conductive filler, 0.5wt%~2.0wt% dispersant, 0wt%~0.05wt% defoamer, and the balance being solvent.

13. The composition according to any one of claims 10-12, characterized in that, The defoamer is an organosilicone defoamer.

14. The composition according to claim 13, characterized in that, The defoamer is dimethyl silicone oil.

15. A conductive carbon black slurry, prepared from raw materials comprising the carbon black composition of any one of claims 1-14.

16. A method for preparing the conductive carbon black slurry according to claim 15, comprising the following steps: The composition, including high-structure carbon black, negative pressure carbon black, conductive filler, dispersant and organic solvent, is mixed and then ground. The grinding temperature is 10~20℃; the grinding time is 20~30min.

17. The preparation method according to claim 16, characterized in that, Add defoamer before grinding.

18. The use of the carbon black composition according to any one of claims 1-14 or the conductive carbon black slurry according to claim 15 in battery materials, electromagnetic wave shielding materials and electronic component coating materials.

Images