A method for preparing highly dispersible acetylene black and its granules

Abstract

This invention belongs to the field of carbon black production technology, specifically relating to a method for preparing highly dispersible acetylene carbon black and its granules. The method involves mixing raw acetylene carbon black with a CH3COOOH solution to form a mixture; wherein the mass ratio of the CH3COOOH solution to the raw acetylene carbon black is (4 to 6):15; the mixture is then subjected to a conductive treatment to prepare highly dispersible acetylene carbon black; the dispersibility value of the prepared highly dispersible acetylene carbon black is 17.4. No dispersant or auxiliary agent is introduced during the conductive treatment of the raw acetylene carbon black mixed with the CH3COOOH solution to prepare the highly dispersible acetylene carbon black, therefore the prepared highly dispersible acetylene carbon black is free of impurities and has high purity; the resistivity of the highly dispersible acetylene carbon black prepared by the method provided by this invention is 1.3 Ω·m, compared to the resistivity of 3 Ω·m of high-quality acetylene carbon black on the market, exhibiting both high dispersibility and high conductivity.

Description

Technical Field

[0001] This invention belongs to the field of carbon black production technology, specifically relating to a method for preparing highly dispersible acetylene carbon black and its granules. Background Technology

[0002] Acetylene black is a carbon black obtained by continuously pyrolyzing acetylene with a purity of over 99%, which is obtained by decomposing and refining acetylene, a byproduct of the pyrolysis of calcium carbide or naphtha (crude gasoline). Compared with furnace black, it has a more developed crystal structure and secondary structure, resulting in better electrical conductivity and liquid absorption. Due to its lower levels of heavy metals and other impurities, it suffers less loss due to self-discharge. It is mainly used as the negative electrode in nickel-metal hydride batteries and can also be used as a conductor in supercapacitors.

[0003] Currently, to improve the dispersibility and stability of carbon black in polar solvent systems, the main method is dispersant-assisted dispersion. For example, Chinese invention patent CN201380047462.2 discloses an acetylene black dispersion slurry and a lithium-ion secondary battery. To improve the dispersibility of acetylene black, a dispersant is added to it, which can increase the dispersibility value of acetylene black to about 17 and the resistivity to 3 Ω·m, thus making it easier for acetylene black to disperse in the dispersion medium and improving its dispersibility. However, because a dispersant is added to acetylene black, impurities are indirectly introduced, reducing the purity of acetylene black and resulting in low purity that does not meet the requirements of some products. Summary of the Invention

[0004] In view of this, the present invention provides a method for preparing highly dispersible acetylene black and granules, to solve the technical problem in the prior art that when adding dispersing aids to improve the dispersibility of acetylene black, impurities are indirectly introduced, reducing the purity of acetylene black and resulting in low purity that does not meet the requirements of some products.

[0005] To achieve the above objectives, this application adopts the following approach:

[0006] A method for preparing highly dispersible acetylene black includes the following steps:

[0007] The raw material acetylene black is mixed with CH3COOOH solution to form a mixture; wherein the mass ratio of CH3COOOH solution to raw material acetylene black is (4 to 6):15.

[0008] The mixture is subjected to a conductive treatment to prepare highly dispersible acetylene black.

[0009] Preferably, the step of "conductively treating the mixture to prepare highly dispersible acetylene black" includes the following steps:

[0010] A conductive container is provided, the conductive container including at least one carbon black modified cylinder, the two ends of the carbon black modified cylinder are provided with caps, the caps are provided with conductive posts, and the conductive posts can be connected to a power source.

[0011] The mixture is introduced into the carbon black modification cylinder, the cover is closed, and the conductive post is brought into contact with the mixture.

[0012] After maintaining the power supply for a first preset time, open the cover to obtain the highly dispersible acetylene black.

[0013] Preferably, in the "first preset duration of maintaining the energized state", the energizing voltage is 220V to 380V.

[0014] Preferably, in the "maintain energized state for a first preset duration", the energized state is maintained until the current in the circuit remains constant.

[0015] Preferably, the mass concentration of the CH3COOOH solution is 3% to 5%.

[0016] Preferably, the temperature of the CH3COOOH solution is between 60°C and 90°C.

[0017] Preferably, the acetylene black raw material has an average particle size of 30 nm to 45 nm and a specific surface area of ​​55 m². 2 / g to 70m 2 / g, oxygen content of 0.07% to 0.26%, pH value of 5 to 7, resistivity of 3 Ω·m to 5 Ω·m.

[0018] Preferably, the preparation of the highly dispersible acetylene black also includes a drying process.

[0019] A highly dispersible acetylene black particle is prepared by the following method: highly dispersible acetylene black is prepared by the method described above and dried; the dried highly dispersible acetylene black is impregnated with water, and then granulated to obtain highly dispersible acetylene black particles.

[0020] A highly dispersible acetylene black particle is prepared by the following method: raw acetylene black is impregnated with a CH3COOOH solution, wherein the mass ratio of the CH3COOOH solution to the raw acetylene black is (4 to 6):15, and the mass concentration of the CH3COOOH solution is 3% to 5%; the impregnated raw acetylene black is subjected to a conductive treatment; the conductive treated raw acetylene black is then granulated and dried to obtain highly dispersible acetylene black particles.

[0021] The technical solution adopted in this application has at least the following beneficial effects:

[0022] 1. This application provides a method for preparing highly dispersible acetylene black. The method involves mixing the raw acetylene black with a CH3COOOH solution in a mixer to form a mixture. The mixture is then subjected to a conductive treatment to obtain highly dispersible acetylene black. The mass ratio of the CH3COOOH solution to the raw acetylene black is (4 to 6):15. The resulting highly dispersible acetylene black has a dispersibility value of 17.4 and a hydroxyl value of 0.32 mgKOH / g. Compared to the dispersibility value of the raw acetylene black (8.21), the method provided in this application produces highly dispersible acetylene black with higher dispersibility. Furthermore, no dispersant or auxiliary agent is introduced during the conductive treatment of the raw acetylene black with the CH3COOOH solution, resulting in highly dispersible acetylene black free of impurities and with high purity.

[0023] 2. The highly dispersible acetylene black prepared by the method provided in this invention has a resistivity of 1.3 Ω·m, which is higher than the resistivity of 3 Ω·m of high-quality acetylene black on the market. It has both high dispersibility and high conductivity.

[0024] 3. When the prepared highly dispersible acetylene black was left to stand in room temperature water for 15 days, there was no precipitation, no stratification, and no agglomeration. In contrast, the raw acetylene black showed precipitation, stratification, and agglomeration when left to stand in room temperature water for more than 5 days. It can be seen that the method provided in this invention can prepare highly dispersible acetylene black with good stability. Attached Figure Description

[0025] Figure 1 This is a line graph showing the dispersibility value of acetylene black in Example 2 of this invention;

[0026] Figure 2 This is a line graph showing the hydroxyl value of acetylene black in Example 2 of this invention;

[0027] Figure 3 This is a line graph showing the resistivity of acetylene black in Example 2 of this invention;

[0028] Figure 4 This is a line graph showing the dispersion stability values ​​of acetylene carbon black in Example 2 of this invention.

[0029] Figure 5 This is a schematic diagram of the conductive container in this invention.

[0030] In the figure, there is a conductive container 100, a carbon black modified cylinder 110, a cover 111, a conductive column 112, and a power supply 120. Detailed Implementation

[0031] To facilitate understanding of this application, a more comprehensive description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are also given. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of this application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] In this embodiment, a method for preparing highly dispersible acetylene black includes: mixing raw acetylene black with a CH3COOOH solution to form a mixture; wherein the mass ratio of the CH3COOOH solution to the raw acetylene black is (4 to 6):15; and subjecting the mixture to conductive treatment to prepare highly dispersible acetylene black.

[0034] In this embodiment, the raw material acetylene black is acetylene black powder. To prepare highly dispersible acetylene black, the raw material acetylene black and the CH3COOOH solution are mixed in a mixer to form a mixture. Then, the mixture is subjected to a conductive treatment to obtain highly dispersible acetylene black. When the mass ratio of the CH3COOOH solution to the raw material acetylene black is (4 to 6):15, the prepared highly dispersible acetylene black exhibits high dispersibility, dispersion stability, and conductivity. The effect is even better when the mass ratio of the CH3COOOH solution to the raw material acetylene black is 6:15.

[0035] The prepared highly dispersible acetylene black has a dispersibility value of 17.4 and a hydroxyl value of 0.32 mgKOH / g. Compared with the dispersibility value of 8.21 of the raw acetylene black, the highly dispersible acetylene black prepared by the method provided in this application has higher dispersibility. Furthermore, when preparing highly dispersible acetylene black by mixing the raw acetylene black with CH3COOOH solution for conductive treatment, no dispersant or auxiliary agent is introduced. Therefore, the prepared highly dispersible acetylene black is free of impurities and has high purity. The resistivity of the highly dispersible acetylene black prepared by the method provided in this invention is 1.3 Ω·m, compared with the resistivity of 3 Ω·m of commercially available high-quality acetylene black, exhibiting both high dispersibility and high conductivity. When the prepared highly dispersible acetylene black is left to stand in room temperature water for 15 days, there is no precipitation, no stratification, and no agglomeration. In contrast, the raw acetylene black, when left to stand in room temperature water for more than 5 days, exhibits precipitation, stratification, and agglomeration. This demonstrates that the method provided in this invention can prepare highly dispersible acetylene black with good stability.

[0036] Please refer to Figure 5 The process of "conductively treating the mixture to prepare highly dispersible acetylene black" includes: providing a conductive container 100, the conductive container 100 including at least one carbon black modification cylinder 110, the carbon black modification cylinder 110 having caps 111 at both ends, the caps 111 having conductive posts 112, the conductive posts 112 being able to connect to a power source 120; introducing the mixture into the carbon black modification cylinder 110, closing the caps 111, and making the conductive posts 112 contact the mixture; maintaining an energized state, and after the energization is completed, opening the caps 111 to obtain the highly conductive acetylene black.

[0037] The conductive container 100 provided in this application includes at least one carbon black modification cylinder 110. The carbon black modification cylinder 110 can be a cylindrical or square cylinder, and its size can be set according to actual needs. Preferably, in this embodiment, two carbon black modification cylinders 110 are provided, which can be used alternately to save time and improve efficiency. Both ends of the carbon black modification cylinder 110 are provided with caps 111, and conductive posts 112 are provided on the caps 111. The conductive posts 112 are connected to a power supply 120. In use, the caps 111 are first opened, and the mixture is introduced into the carbon black modification cylinder 110. When the carbon black modification cylinder 110 is full of the mixture, the caps 111 are closed, and the power supply 120 is switched on. The conductive posts 112 remain energized to conduct electricity to the mixture.

[0038] Specifically, in the "first preset duration of maintaining the energized state", the energizing voltage is between 220V and 380V. The preferred energizing voltage is 220V.

[0039] Specifically, in the "first preset duration of maintaining the energized state", the energized state is maintained until the current in the circuit is constant. When the mixture in the carbon black modification cylinder 110 is subjected to conductive treatment, the energizing voltage is fixed, preferably 220V. When the current is constant, that is, when the resistance of the mixture in the carbon black modification cylinder 110 basically tends to be stable and no longer fluctuates significantly, the energizing is stopped, and highly dispersed acetylene carbon black is obtained.

[0040] Preferably, the CH3COOOH solution has a mass concentration of 3% to 5%, more preferably 5%.

[0041] Preferably, the temperature of the CH3COOOH solution is 60°C to 90°C, and more preferably 75°C.

[0042] In the above embodiments, the raw material acetylene carbon black has an average particle size of 30 nm to 45 nm and a specific surface area of ​​55 m². 2 / g to 70m 2 / g, oxygen content of 0.07% to 0.26%, pH value of 5 to 7, resistivity of 3Ω·m.

[0043] In some optional embodiments, the prepared highly dispersible acetylene black is also dried.

[0044] A highly dispersible acetylene black particle is prepared by the following method: highly dispersible acetylene black is prepared by the method described above and dried; the dried highly dispersible acetylene black is impregnated with water, and then granulated to obtain highly dispersible acetylene black particles.

[0045] The highly dispersible acetylene black prepared by the method provided in this invention is dried until the moisture content reaches the conventional limit, thus obtaining dried highly dispersible acetylene black. Then, the dried highly dispersible acetylene black is soaked in water for a period of time and then granulated to obtain highly dispersible acetylene black particles with high purity and high conductivity.

[0046] A highly dispersible acetylene black particle is prepared by the following method: raw acetylene black is impregnated with a CH3COOOH solution, wherein the mass ratio of the CH3COOOH solution to the raw acetylene black is (4 to 6):15, and the mass concentration of the CH3COOOH solution is 3% to 5%; the impregnated raw acetylene black is subjected to a conductive treatment; the conductive treated raw acetylene black is then granulated and dried to obtain highly dispersible acetylene black particles.

[0047] In preparing highly dispersible acetylene black particles, firstly, the raw acetylene black is impregnated with the CH3COOOH solution. Preferably, the mass ratio of the CH3COOOH solution to the raw acetylene black is 6:15, and the mass concentration of the CH3COOOH solution is 5%. Then, the impregnated raw acetylene black is introduced into a conductive container 100 for conductive treatment to obtain highly dispersible acetylene black particles with high purity and high conductivity.

[0048] The following specific experimental examples further illustrate the technical solution and effects of the present invention. It should be noted that the following experimental examples are only for further explanation of the present invention and do not limit the technical solution of the present invention.

[0049] 1. Experimental Materials and Methods

[0050] 1.1 Experimental Materials

[0051] The raw materials are acetylene black and CH3COOOH solution. The acetylene black comes from Ningxia Jinhai Wode Technology Co., Ltd., and the CH3COOOH solution is commercially available.

[0052] The conductive container 100 used in the following embodiments includes a carbon black modified cylinder 110. For ease of resistivity calculation, the cross-sectional area of ​​the carbon black modified cylinder 110 is 0.25 m². 2 The length of the carbon black modification cylinder 110 is 2m;

[0053] The raw material, acetylene carbon black, has a dispersibility value of 8.21, a hydroxyl value of 0.2 mg KOH / g, a resistivity of 3 Ω·m, and slight precipitation after standing in room temperature water for 6 days.

[0054] 1.2 Experimental Methods

[0055] The experiment was divided into six treatment groups: Comparative Example 1, Comparative Example 2, Comparative Example 3, Example 1, Example 2, and Example 3. Acetylene black (dried acetylene black) was prepared from each of the six treatment groups, and its parameters were measured according to the following detection methods:

[0056] The current and voltage during the conductive treatment are detected, the resistance is calculated, and the resistivity of the treated acetylene black is calculated according to the formula for resistance and resistivity.

[0057] The treated acetylene black was placed in room temperature water for different periods of time to test its dispersion stability.

[0058] According to the patent number: CN201710367601.X, entitled "Detection method for carbon black dispersibility provided in determining carbon black dispersibility using blackness distribution curve", the dispersibility value of the acetylene carbon black treated in the following examples was detected.

[0059] The hydroxyl value of the treated acetylene black was determined by gas chromatography.

[0060] 2. Comparative Example 1: Conductivity treatment of raw material acetylene black

[0061] Raw acetylene black was introduced into the carbon black modification cylinder 110. When the carbon black modification cylinder 110 was full of raw acetylene black, the cover 111 was closed, the power supply 120 was turned on, and the power supply was kept on. The power supply voltage was 220V. When the current in the circuit was constant, the power supply 120 was turned off to obtain the processed acetylene black. The current value and voltage value when the current was constant were recorded. The resistivity of the processed acetylene black was calculated according to the above calculation method, and its dispersibility, dispersion stability and hydroxyl value were tested. The results are shown in Table 1.

[0062] 3. Comparative Example 2: Conductivity treatment of the mixture (raw materials: acetylene black and water)

[0063] The difference between Comparative Example 2 and Comparative Example 1 above is that: water at 75°C and raw material acetylene carbon black are mixed at a mass ratio of 6:15 to form a mixture. The mixture is then introduced into the carbon black modification cylinder 110. After the carbon black modification cylinder 110 is filled with the mixture, the cover 111 is closed, the power supply 120 is connected, and the power supply is maintained. The other steps are the same as those in Comparative Example 1 above. The results are shown in Table 1.

[0064] 4. Comparative Example 3: Non-conductive treatment of the mixture (raw materials: acetylene black and CH3COOOH solution)

[0065] The difference between Comparative Example 3 and Comparative Example 1 above is that: CH3COOOH solution at 75℃ was mixed with raw material acetylene black at a mass ratio of 6:15 to form a mixture. The mass concentration of the CH3COOOH solution was 5%. No conductive treatment was performed. After drying, acetylene black was obtained. The results are shown in Table 1.

[0066] 5. Example 1: Conductive treatment of the mixture (raw materials: acetylene black and CH3COOOH solution)

[0067] The difference between Example 1 and Comparative Example 1 is that: CH3COOOH solution at 75°C is mixed with raw material acetylene black at a mass ratio of 6:15 to form a mixture. The mass concentration of the CH3COOOH solution is 5%. Other steps are the same as those in Comparative Example 1. The results are shown in Table 1.

[0068] Table 1 Experimental Results Detection Table

[0069]

[0070] As can be seen from the data in Comparative Example 1 in Table 1 above, when the raw material acetylene carbon black is directly introduced into the carbon black modification cylinder 110 and energized, the dispersibility value of the treated acetylene carbon black is 8.39 and the hydroxyl value is 0.2 mgKOH / g; when energized at a voltage of 220V, the current is 10A when the current reaches a constant value, and according to the resistivity calculation formula, the resistivity of the acetylene carbon black is 2.75Ω·m; when the acetylene carbon black is left to stand in room temperature water for 7 days, there is slight precipitation, no stratification, and no agglomeration after standing for 1 to 6 days;

[0071] As can be seen from the data in Comparative Example 2 in Table 1 above, when acetylene black is mixed with water at 75°C to form a mixture, and this mixture is then introduced into the carbon black modification cylinder 110 and energized, the resulting acetylene black has a dispersibility value of 11.37 and a hydroxyl value of 0.25 mgKOH / g. When energized at 220V, the current reaches a constant value of 14A. According to the resistivity calculation formula, the resistivity of this acetylene black is 1.96 Ω·m. Slight precipitation only occurs after the acetylene black has been left to stand in room temperature water for 12 days.

[0072] As can be seen from the data in Comparative Example 3 in Table 1 above, when CH3COOOH solution at 75℃ is mixed with raw acetylene black at a mass ratio of 6:15 to form a mixture, and dried, the resulting acetylene black has a dispersibility value of 8.9 and a hydroxyl value of 0.21 mgKOH / g; when energized at 220V, the current reaches a constant value of 11A, and according to the resistivity calculation formula, the resistivity of this acetylene black is 2.6 Ω·m; when the acetylene black is left to stand in room temperature water for 8 days, slight precipitation occurs.

[0073] As can be seen from the data in Example 1 in Table 1 above, when CH3COOOH solution at 75℃ is mixed with raw material acetylene carbon black at a mass ratio of 6:15 to form a mixture, and the mixture is introduced into the carbon black modification cylinder 110 and energized, the resulting acetylene carbon black has a dispersibility value of 17.4 and a hydroxyl value of 0.32 mgKOH / g; when energized at a voltage of 220V, the current reaches a constant value of 22A, and according to the resistivity calculation formula, the resistivity of the acetylene carbon black is 1.3 Ω·m; when the acetylene carbon black is left to stand in room temperature water for 15 days, there is no precipitation, no stratification, and no agglomeration.

[0074] The data in Table 1 above fully demonstrates that when acetylene black is mixed with CH3COOOH solution to form a mixture, and this mixture is then introduced into the carbon black modification cylinder 110 and electrified, the resulting acetylene black has a larger hydroxyl value, lower resistivity, higher dispersibility, and better dispersion stability compared to the acetylene black obtained in Comparative Examples 1, 2, and 3. The lower the resistivity, the better the conductivity. Therefore, the acetylene black in Example 1 has high dispersibility and conductivity, making it a highly dispersible acetylene black. Furthermore, because only CH3COOOH solution was added during the preparation process for conductivity treatment to improve the dispersibility of the acetylene black, without the use of other dispersants or additives, the resulting highly dispersible acetylene black is free of impurities and has high purity.

[0075] 6. Example 2: Optimal mass ratio of raw material acetylene black to CH3COOOH solution

[0076] The difference between Example 2 and Example 1 above is that the mass ratio of the raw material acetylene black to the CH3COOOH solution is changed to form a mixture, and the mass concentration of the CH3COOOH solution is changed accordingly at this mass ratio. The other steps are the same as those in Example 1 above. The specific mass ratio of the raw material acetylene black to the CH3COOOH solution is shown in Table 2.

[0077] Table 2 Mass ratio of raw material acetylene black to CH3COOOH solution

[0078]

[0079]

[0080] After the experiment, the hydroxyl value, resistivity, dispersibility value, and dispersion stability of the highly dispersible acetylene black after the first to twenty-fourth experimental groups were measured and calculated. The specific results are shown in Table 3.

[0081] Table 3. Experimental Results Detection Table for Example 2

[0082]

[0083]

[0084] Please refer to Table 3 and... Figure 1When the mass ratio of CH3COOOH solution to raw acetylene black is constant, changing the concentration of CH3COOOH solution reveals that when the concentration is between 1% and 4%, the dispersibility value of highly dispersible acetylene black gradually increases; when the concentration is greater than 4%, the dispersibility value essentially remains unchanged; and when the concentration is greater than 4%, the dispersibility value tends to decrease. Therefore, the concentration of CH3COOOH solution is typically between 3% and 5%. Similarly, when the concentration of CH3COOOH solution is constant, changing the mass ratio of CH3COOOH solution to raw acetylene black reveals that when the mass ratio is between 2 and 6:15, the dispersibility value of highly dispersible acetylene black gradually increases; and when the mass ratio is greater than 6:15, the dispersibility value essentially remains unchanged.

[0085] Please refer to Table 3 and... Figure 2 When the mass ratio of CH3COOOH solution to raw acetylene black is constant, changing the concentration of CH3COOOH solution reveals that when the concentration is between 1% and 4%, the hydroxyl value of highly dispersible acetylene black gradually increases. When the concentration of CH3COOOH solution is greater than 4%, the hydroxyl value of highly dispersible acetylene black essentially stops changing and becomes stable. Therefore, the concentration of CH3COOOH solution is 3% to 5%. Similarly, when the concentration of CH3COOOH solution is constant, changing the mass ratio of CH3COOOH solution to raw acetylene black reveals that when the mass ratio is between 2 and 6:15, the hydroxyl value of highly dispersible acetylene black gradually increases. When the mass ratio is greater than 6:15, the hydroxyl value of highly dispersible acetylene black essentially stops changing.

[0086] Please refer to Table 3 and... Figure 3When the mass ratio of CH3COOOH solution to raw acetylene black is constant, changing the concentration of CH3COOOH solution reveals that when the concentration is between 1% and 4%, the resistivity of highly dispersible acetylene black gradually decreases. When the concentration of CH3COOOH solution is greater than 4%, the resistivity of highly dispersible acetylene black essentially stops changing and becomes stable. Therefore, the concentration of CH3COOOH solution is typically between 3% and 5%. Similarly, when the concentration of CH3COOOH solution is constant, changing the mass ratio of CH3COOOH solution to raw acetylene black reveals that when the mass ratio is between 2 and 6:15, the resistivity of highly dispersible acetylene black gradually decreases. When the mass ratio is greater than 6:15, the resistivity of highly dispersible acetylene black essentially stops changing.

[0087] Please refer to Table 3 and... Figure 4 When the mass ratio of CH3COOOH solution to raw acetylene black is 2:15 and 8:15, and the concentration of CH3COOOH solution is greater than 3%, the dispersion stability of the prepared highly dispersible acetylene black is lower than that when the mass ratio of CH3COOOH solution to raw acetylene black is 4:15 and 6:15, and the concentration of CH3COOOH solution is greater than 3%. At the same time, when the mass ratio of CH3COOOH solution to raw acetylene black is 4 to 6:15, and the concentration of CH3COOOH solution is greater than 3%, the dispersion stability of the prepared highly dispersible acetylene black is significantly weaker.

[0088] Based on the experimental data in the charts, when the mass ratio of CH3COOOH solution to raw material acetylene black is greater than 6:15, the dispersibility value, hydroxyl value, resistivity, and dispersion stability of the obtained highly dispersible acetylene black remain essentially unchanged. In other words, when the proportion of CH3COOOH solution is relatively high, the performance of highly dispersible acetylene black is basically not affected by the same treatment method. Therefore, to save costs and resources, the preferred mass ratio of raw material acetylene black to CH3COOOH solution is 4 to 6:15, preferably 6:15.

[0089] Similarly, when the concentration of the CH3COOOH solution is greater than 5%, the dispersibility value, hydroxyl value, resistivity and dispersion stability of the highly dispersible acetylene black also remain essentially unchanged. Therefore, the concentration of the CH3COOOH solution is selected to be 3% to 5%, preferably 5%.

[0090] 7. Example 3: Optimal Temperature of CH3COOOH Solution

[0091] The difference between Example 3 and Example 1 above is that the temperature of the CH3COOOH solution is changed, and the raw material acetylene black is mixed with CH3COOOH solutions at different temperatures to form a mixture. The other steps are the same as those in Example 1 above. The specific temperatures of the CH3COOOH solution are shown in Table 4.

[0092] Table 4 Temperature of CH3COOOH solution

[0093]

[0094] After the experiment, the hydroxyl value, resistivity, dispersibility value, and dispersion stability of the highly dispersible acetylene black prepared in groups 25 and 26 were measured and calculated. The specific results are shown in Table 5.

[0095] Table 5. Experimental Results Detection Table for Example 3

[0096]

[0097] As can be seen from the data in Table 5, when the temperature of the CH3COOOH solution is 60℃, the hydroxyl value of the highly dispersible acetylene black obtained is 0.29 mgKOH / g, the resistivity is 1.4 Ω·m, and the dispersibility value is 17.0; when the temperature of the CH3COOOH solution is 90℃, the hydroxyl value of the highly dispersible acetylene black obtained is 0.30 mgKOH / g, the resistivity is 1.4 Ω·m, and the dispersibility value is 17.2. All these data are not as good as those obtained in Example 1 when the temperature of the CH3COOOH solution is 75℃.

[0098] It is evident that the temperature of the CH3COOOH solution has an effect on the dispersibility, dispersion stability, and conductivity of highly dispersible acetylene black, but the effect is not significant. When the temperature of the CH3COOOH solution is 75℃, the highly dispersible acetylene black prepared exhibits better dispersibility and conductivity.

[0099] Furthermore, it has been verified that the highly dispersible acetylene black can also be successfully prepared using the method provided by this invention at a voltage of 380V. The dispersibility value, hydroxyl value, resistivity, and dispersion stability of the highly dispersible acetylene black prepared at 380V are basically the same as those of the highly dispersible acetylene black prepared at 220V in Example 1 above. However, the high voltage of 380V is energy-intensive. Therefore, under the premise of achieving the same effect, it is preferable to use a voltage of 220V to prepare the highly dispersible acetylene black.

[0100] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions should all be covered within the scope of protection of the present invention.

Claims

1. A method for preparing highly dispersible acetylene black, characterized in that, Includes the following steps: Acetylene black is mixed with a CH3COOOH solution to form a mixture; wherein the mass ratio of CH3COOOH to acetylene black is 4-6:15, the mass concentration of the CH3COOOH solution is 3% to 5%, the temperature of the CH3COOOH solution is 60°C to 90°C, and the average particle size of the acetylene black is 30nm to 45nm, with a specific surface area of ​​55 m². 2 / g to 70m 2 / g, oxygen content of 0.07% to 0.26%, pH value of 5 to 7, resistivity of 3 Ω·m to 5 Ω·m; A conductive container is provided, the conductive container including at least one carbon black modified cylinder, the two ends of the carbon black modified cylinder are provided with caps, the caps are provided with conductive posts, and the conductive posts can be connected to a power source. The mixture is introduced into the carbon black modification cylinder, the cover is closed, and the conductive post is brought into contact with the mixture. After maintaining the energized state for a first preset time, open the cover to obtain the highly dispersible acetylene black; In the "first preset duration of maintaining the energized state", the energized voltage is 220 V to 380 V; In the "maintain energized state for a first preset duration", the energized state is maintained until the current in the circuit remains constant.

2. The method for preparing highly dispersible acetylene black according to claim 1, characterized in that, It also includes drying the prepared highly dispersible acetylene black.

3. A highly dispersible acetylene carbon black particle, characterized in that, Prepared by the following method: Highly dispersible acetylene black was prepared by the method for preparing highly dispersible acetylene black according to claim 1, and then dried. The dried highly dispersible acetylene black was soaked in water and then granulated to obtain highly dispersible acetylene black particles.

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