Preparation process of carbon black for plastic based on polyethylene wax modification

Abstract

The invention relates to the field of materials, and particularly discloses a preparation process of polyethylene wax modification-based carbon black for plastic. The preparation process comprises the following steps: crushing original carbon black and then carrying out grading treatment; carrying out rotary granulation on the treated carbon black particles, spraying a modified liquid in the granulation process, and enabling the modified liquid drops to collide with the rotating carbon black particles for adsorption, so as to obtain spherical carbon black particles; and carrying out hot air drying and curing on the obtained spherical carbon black particles, and collecting to obtain the modified carbon black particles. In the rotary granulation process, the polyethylene wax emulsion with the solid content of 28-42wt% is sprayed as the modification liquid, so that the modified liquid drops and the rotary carbon black particles are fully collided and adsorbed, the surface characteristics of the carbon black are changed, and the dispersion uniformity of the carbon black in the plastic is improved; therefore, the color difference problem and the mobility problem of the plastic color master batch in the production process are solved.

Description

Technical Field

[0001] This application relates to the field of carbon black, and more specifically, it relates to a process for preparing carbon black for plastics based on polyethylene wax modification. Background Technology

[0002] In the field of carbon black preparation, carbon black, as an important industrial raw material, is widely used in various industries, such as rubber, plastics, and coatings. With the continuous development of these industries, the performance requirements for carbon black products are also increasing. Especially in applications such as black plastic masterbatches, including packaging films and automotive parts, there are more stringent standards for the quality and performance of carbon black, driving carbon black preparation technology towards higher quality and better performance.

[0003] In the traditional carbon black preparation process, various measures are typically taken to meet the requirements of related products. For carbon black dispersion, simple stirring or grinding methods are generally used to attempt to achieve a certain degree of dispersion within the matrix material. For carbon black forming, ordinary granulation equipment is often used, relying on physical extrusion to form granules. Furthermore, to prevent carbon black migration, conventional coating materials are mainly applied to the carbon black surface to reduce its migration potential. However, these traditional methods often fail to achieve the desired results.

[0004] Existing carbon black preparation technologies have significant drawbacks. Uneven carbon black dispersion leads to color variations in the resulting black plastic masterbatches, failing to meet high color fastness requirements. Furthermore, carbon black migration is severe during processing, easily contaminating molds. This affects product quality and increases production and maintenance costs, failing to adequately meet the demands of modern industry for high-quality carbon black. Summary of the Invention

[0005] To address the issues of large color difference and easy migration in black plastic masterbatches, this application provides a preparation process for plastic carbon black based on polyethylene wax modification.

[0006] This application provides the following technical solution: In a first aspect, this application provides a process for preparing plastic carbon black based on polyethylene wax modification, comprising: (1) The raw carbon black is crushed and then graded; (2) The treated carbon black particles are subjected to rotary granulation. During the granulation process, a modified liquid is sprayed to allow the modified liquid droplets to collide and adsorb with the rotating carbon black particles, resulting in spherical carbon black particles. (3) The obtained spherical carbon black particles were dried and cured by hot air, and the modified carbon black particles were collected. The modified liquid is a polyethylene wax emulsion, and the solid content of polyethylene wax in the modified liquid is 28-42 wt%.

[0007] By employing the above technical solution, the raw carbon black is first pulverized and graded, resulting in more uniform carbon black particle size and facilitating subsequent processing. During rotary granulation, a polyethylene wax emulsion with a solid content of 28-42 wt% is sprayed as a modifying liquid, allowing the modified droplets to fully collide and adsorb with the rotating carbon black particles, thereby altering the surface properties of the carbon black. The polyethylene wax emulsion adheres to the surface of the carbon black particles, improving the uniformity of carbon black dispersion in plastics, thus solving the color difference problem in plastic masterbatch production; it also reduces carbon black migration during processing, preventing mold contamination and resolving migration issues. Finally, hot air drying and curing yield modified carbon black particles, ensuring the stability of the modification effect.

[0008] Furthermore, the amount of polyethylene wax added to the modified liquid is 2.8-5.2 wt% of the carbon black particles.

[0009] By adopting the above technical solution, the amount of polyethylene wax added to the modified liquid is controlled at 2.8-5.2 wt% of the carbon black particles. This helps to more accurately adjust the ratio of modified liquid to carbon black particles, so that the polyethylene wax can more effectively coat the carbon black particles, further improving the performance stability of the modified carbon black particles, thereby better ensuring the quality consistency of plastic products in practical applications.

[0010] Furthermore, in the process of preparing spherical carbon black particles, the modified liquid is atomized into micron-sized droplets using a centrifugal atomizing nozzle, with an atomization pressure of 0.15-0.25 MPa and a droplet diameter of ≤50 μm.

[0011] By adopting the above technical solution, the modified liquid is atomized into micron-sized droplets using a centrifugal atomizing nozzle, which allows the modified droplets to better collide and adsorb with the rotating carbon black particles, thereby improving the dispersion uniformity of carbon black in plastics. Controlling the atomization pressure to 0.15-0.25 MPa and the droplet size to ≤50 μm ensures the atomization effect of the modified droplets, further guaranteeing their full collision and adsorption with the carbon black particles, which helps to better achieve the modification of carbon black.

[0012] Furthermore, the above-mentioned spherical carbon black particles are prepared using a rotary granulator, with the internal temperature of the granulator controlled at 120-150℃.

[0013] By adopting the above technical solution, a rotary granulator is used to prepare spherical carbon black particles, and the internal temperature is controlled at 120-150℃. This promotes the rapid penetration of wax droplets into the pores of the carbon black particles. Combined with the steps of crushing and classifying the original carbon black, spraying polyethylene wax emulsion, and hot air drying and curing, the surface properties of the carbon black are changed.

[0014] Furthermore, in the above-mentioned hot air drying and curing, the hot air temperature is 180-220℃ and the wind speed is 1-2m / s.

[0015] Furthermore, in the above-mentioned hot air drying and curing, the drying time is 10-15 seconds.

[0016] By adopting the above technical solution, the spherical carbon black particles with polyethylene wax emulsion modified liquid are dried and cured by hot air at a temperature of 180-220℃ and a wind speed of 1-2m / s. This removes the moisture from the wax emulsion and changes the surface properties of the carbon black.

[0017] Furthermore, after the spherical carbon black particles are dried and cured by hot air, the process also includes the step of collecting the finished modified carbon black particles using a cyclone separator and a bag filter.

[0018] By adopting the above technical solutions, using cyclone separators and bag filters to collect finished modified carbon black particles, it is possible to efficiently and accurately collect qualified modified carbon black particles, reduce finished product loss, and improve collection efficiency and product quality.

[0019] Further, in step (1) above, the raw carbon black is pulverized using a fluidized bed air jet mill at a pressure of 0.4-0.6 MPa and a temperature of 70-80℃ to obtain preliminary pulverized particles of 50-100 nm. Subsequently, a centrifugal air jet classifier is used at a speed of 2000-3000 rpm and a classification accuracy of D90≤50 nm to screen carbon black particles with a particle size of 20-50 nm and remove coarse particles.

[0020] By adopting the above technical solution, the raw carbon black is pulverized by a fluidized bed air jet mill under specific pressure and temperature to obtain preliminary pulverized particles with a suitable particle size range. Then, the particles are screened by a centrifugal air jet classifier at a specific speed and classification accuracy to accurately obtain carbon black particles with a particle size of 20-50nm and remove coarse particles. This effectively controls the carbon black particle size, improves the surface properties of carbon black, and thus enhances the dispersion uniformity of carbon black in plastics.

[0021] Furthermore, the preparation method of the modified liquid described above includes: Oxidized polyethylene is heated to a molten state at 130-150°C, and a composite emulsifier is added and stirred to form a primary emulsion. The composite emulsifier is formed by compounding isomeric alcohol polyoxyethylene ether and nonylphenol polyoxyethylene ether at a mass ratio of 1:0.3-0.5, and the amount of the composite emulsifier is 6-8 wt% of the mass of the oxidized polyethylene. The primary emulsion was mixed with water and homogenized using a high-pressure homogenizer to control the droplet size of the wax droplets within 0.1-1 μm, thus obtaining a stable modified liquid.

[0022] By employing the above technical solution, during the preparation of the modified liquid, oxidized polyethylene is heated to a molten state at 130-150℃. A composite emulsifier, formed by mixing isomeric alcohol polyoxyethylene ether and nonylphenol polyoxyethylene ether at a mass ratio of 1:0.3-0.5, is then added and stirred. The synergistic effect of the isomeric alcohol polyoxyethylene ether and nonylphenol polyoxyethylene ether allows for better emulsification of the oxidized polyethylene, forming a primary emulsion. The amount of the composite emulsifier, at 6-8 wt% of the oxidized polyethylene mass, ensures effective emulsification. The primary emulsion is then mixed with water and homogenized using a high-pressure homogenizer, controlling the wax droplet size to 0.1-1 μm, resulting in a stable modified liquid. Using this stable modified liquid in carbon black preparation can further improve the dispersion uniformity of carbon black in plastics.

[0023] Secondly, this application provides a plastic carbon black based on polyethylene wax modification, which is prepared by the above-described preparation method.

[0024] In summary, this application has the following beneficial effects: This application first pulverizes and grades the raw carbon black, then sprays a polyethylene wax emulsion with a polyethylene wax solid content of 28-42 wt% during rotary granulation, allowing it to collide and adsorb with the carbon black particles. After hot air drying and curing, the product is collected. The preferred scheme also includes operations such as controlling the amount of modified liquid added, using centrifugal atomizing nozzles to atomize the modified liquid, controlling the internal temperature of the granulator, controlling the hot air drying parameters, using specific equipment to collect the finished product, controlling the pulverizing and grading conditions, and using specific modified liquid preparation methods. These operations can change the surface properties of carbon black and improve the dispersion uniformity of carbon black in plastics, thereby solving the color difference and migration problems of plastic masterbatches during the production process. Attached Figure Description

[0025] Figure 1 This is a flowchart of the preparation method of modified carbon black for plastics provided in this application. Detailed Implementation

[0026] The embodiments of the present invention will be described in detail below with reference to the examples. However, those skilled in the art will understand that the following examples are only for illustrating the present invention and should not be regarded as limiting the scope of the present invention. Specific conditions not specified in the examples shall be carried out according to conventional conditions or conditions recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0027] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0028] Preparation examples of raw materials and / or intermediates Preparation Example 1 This preparation example provides a method for preparing a modified liquid, which includes: (1) Mix isomeric alcohol polyoxyethylene ether and nonylphenol polyoxyethylene ether at a mass ratio of 1:0.4 and stir evenly to form a composite emulsifier; (2) Take 500g of oxidized polyethylene and heat it to 140℃ until the oxidized polyethylene is in a molten state to ensure that the wax is completely liquefied in order to reduce cohesion and facilitate subsequent dispersion.

[0029] (3) Add 35g of the composite emulsifier from step (1) to the melt of the above-mentioned oxidized polyethylene and stir to form a primary emulsion.

[0030] (4) The above primary emulsion is mixed with water and homogenized using a high-pressure homogenizer to control the particle size of the wax droplets within the range of 0.1-1μm, thereby obtaining a stable modified liquid with a solid content of 34%.

[0031] Preparation Example 2 This preparation example provides a method for preparing a modified liquid, which includes: (1) Mix isomeric alcohol polyoxyethylene ether and nonylphenol polyoxyethylene ether at a mass ratio of 1:0.3 and stir evenly to form a composite emulsifier; (2) Take 500g of oxidized polyethylene and heat it to 150℃ until the oxidized polyethylene is in a molten state to ensure that the wax is completely liquefied in order to reduce cohesion and facilitate subsequent dispersion.

[0032] (3) Add 40g of the composite emulsifier from step (1) to the molten oxidized polyethylene and stir to form a primary emulsion.

[0033] (4) The above primary emulsion is mixed with water and homogenized using a high-pressure homogenizer to control the droplet size within the range of 0.1-1μm to obtain a stable modified liquid with a solid content of 31%.

[0034] Preparation Example 3 This preparation example provides a method for preparing a modified liquid, which includes: (1) Mix isomeric alcohol polyoxyethylene ether and nonylphenol polyoxyethylene ether at a mass ratio of 1:0.5 and stir evenly to form a composite emulsifier; (2) Take 500g of oxidized polyethylene and heat it to 130℃ until the oxidized polyethylene is in a molten state to ensure that the wax is completely liquefied in order to reduce cohesion and facilitate subsequent dispersion.

[0035] (3) Add 30g of the composite emulsifier from step (1) to the melt of the above-mentioned oxidized polyethylene and stir to form a primary emulsion.

[0036] (4) The above primary emulsion is mixed with water and homogenized using a high-pressure homogenizer to control the droplet size within the range of 0.1-1μm to obtain a stable modified liquid with a solid content of 38%.

[0037] Preparation Example 4 The difference between this preparation example and Preparation Example 1 lies in the composition of the composite emulsifier: (1) Mix isomeric alcohol polyoxyethylene ether, nonylphenol polyoxyethylene ether, and nano silica in a mass ratio of 1:0.4:0.2 and stir evenly to form a composite emulsifier.

[0038] Preparation Example 5 The difference between this preparation example and preparation example 1 is that the composition of the emulsifier is different: in this preparation example, isomeric alcohol polyoxyethylene ether (35g) is added as an emulsifier in step (3).

[0039] Preparation Example 6 The difference between this preparation example and preparation example 1 is that the composition of the emulsifier is different: in this preparation example, nonylphenol polyoxyethylene ether (35g) is added as an emulsifier in step (3). Example

[0040] Example 1 This embodiment provides a modified carbon black for plastics, the preparation method of which includes: (1) The raw carbon black generated by the incomplete combustion of gaseous hydrocarbons is crushed and then graded to screen carbon black particles with a particle size of 20-50nm. (2) Carbon black particles were fed into a rotary granulator for granulation. During the granulation process, a centrifugal atomizing nozzle was used to atomize the modified liquid (provided in Preparation Example 1) into micron-sized droplets with a particle size ≤50μm. The atomized liquid was sprayed in the central area of ​​the granulator, allowing the modified droplets to collide and adsorb with the rotating carbon black particles. Simultaneously, the temperature inside the granulator was maintained at 130-135℃ to promote the rapid penetration of the modified droplets into the voids of the carbon black particles, resulting in spherical carbon black particles. The amount of polyethylene wax added to the modified liquid was 3.6wt% of the carbon black particles; the atomization pressure was 0.2MPa; the droplet size was ≤50μm; and the coverage uniformity was ≥95%.

[0041] (3) The obtained spherical carbon black particles were dried and cured by hot air at a temperature of 200℃ and a wind speed of 2m / s for 10s. The finished product was then collected by a cyclone separator and a bag filter to obtain modified carbon black particles.

[0042] Example 2 The difference between this embodiment and Embodiment 1 lies in step (2): Carbon black particles were fed into a rotary granulator for granulation. During granulation, a modified liquid (provided in Preparation Example 2) was atomized into micron-sized droplets with a particle size ≤50μm using a centrifugal atomizing nozzle. These droplets were sprayed into the central area of ​​the granulator, allowing them to collide and adsorb with the rotating carbon black particles. Simultaneously, the granulator was maintained at 120-125℃ to promote rapid penetration of the modified droplets into the pores of the carbon black particles, resulting in spherical carbon black particles. The amount of polyethylene wax added to the modified liquid was 3.6wt% of the carbon black particles; the atomization pressure was 0.2MPa; the droplet size was ≤50μm; and the coverage uniformity was ≥95%.

[0043] Example 3 The difference between this embodiment and Embodiment 1 lies in step (2): Carbon black particles were fed into a rotary granulator for granulation. During granulation, a modified liquid (provided in Preparation Example 3) was atomized into micron-sized droplets with a particle size ≤50 μm using a centrifugal atomizing nozzle. These droplets were sprayed into the central area of ​​the granulator, allowing them to collide and adsorb with the rotating carbon black particles. Simultaneously, the granulator was maintained at 145-150°C to promote rapid penetration of the modified droplets into the pores of the carbon black particles, resulting in spherical carbon black particles. The amount of polyethylene wax added to the modified liquid was 3.6 wt% of the carbon black particles; the atomization pressure was 0.2 MPa; the droplet size was ≤50 μm; and the coverage uniformity was ≥95%.

[0044] Example 4 The difference between this embodiment and Embodiment 1 lies in step (2): Carbon black particles were fed into a rotary granulator for granulation. During granulation, a modified liquid (provided in Preparation Example 1) was atomized into micron-sized droplets with a particle size ≤50μm using a centrifugal atomizing nozzle. This atomized droplets were sprayed into the central area of ​​the granulator, allowing the modified liquid droplets to collide and adsorb with the rotating carbon black particles. Simultaneously, the granulator was maintained at 130-135℃ to promote rapid penetration of the modified liquid droplets into the voids of the carbon black particles, resulting in spherical carbon black particles. The amount of polyethylene wax added to the modified liquid was 2.8wt% of the carbon black particles; the atomization pressure was 0.15MPa; the droplet size was ≤50μm; and the coverage uniformity was ≥95%.

[0045] Example 5 The difference between this embodiment and Embodiment 1 lies in step (2): Carbon black particles were fed into a rotary granulator for granulation. During granulation, a modified liquid (provided in Preparation Example 1) was atomized into micron-sized droplets with a particle size ≤50μm using a centrifugal atomizing nozzle. These droplets were sprayed into the central area of ​​the granulator, allowing them to collide and adsorb with the rotating carbon black particles. Simultaneously, the granulator was maintained at 130-135℃ to promote rapid penetration of the modified droplets into the pores of the carbon black particles, resulting in spherical carbon black particles. The amount of polyethylene wax added to the modified liquid was 5.2wt% of the carbon black particles; the atomization pressure was 0.25MPa; the droplet size was ≤50μm; and the coverage uniformity was ≥95%.

[0046] Example 6 The difference between this embodiment and Example 5 is that in step (2): the modified liquid is provided by Preparation Example 4, and other parameters remain unchanged.

[0047] Example 7 The difference between this embodiment and Embodiment 1 lies in step (1): 1. Raw carbon black generated from the incomplete combustion of gaseous hydrocarbons is used as raw material. The raw carbon black is pulverized using a fluidized bed jet mill at a pressure of 0.5 MPa and a temperature of 75℃ to obtain preliminary pulverized particles of 50-100 nm. Subsequently, a centrifugal air classifier is used at a speed of 2500 rpm and a classification accuracy of D90≤50 nm to screen carbon black particles with a particle size of 20-50 nm and remove coarse particles.

[0048] Example 8 The difference between this embodiment and Embodiment 1 lies in step (3): (3) The obtained spherical carbon black particles were dried and cured by hot air at a temperature of 220°C and a wind speed of 1 m / s for 15 s. The finished product was then collected by a cyclone separator and a bag filter to obtain modified carbon black particles.

[0049] Comparative Example 1 This comparative example provides a method for preparing carbon black for plastics, which includes: (1) The raw carbon black generated by the incomplete combustion of gaseous hydrocarbons is crushed and then graded to screen carbon black particles with a particle size of 20-50nm. (2) Carbon black particles are fed into a rotary granulator for granulation. During the granulation process, the paraffin emulsion is atomized into micron-sized droplets with a particle size ≤50μm using a centrifugal atomizing nozzle and sprayed in the middle area of ​​the granulator.

[0050] (3) The obtained spherical carbon black particles were dried and cured by hot air at a temperature of 200℃ and a wind speed of 2m / s for 10s. The finished product was then collected by a cyclone separator and a bag filter to obtain modified carbon black particles.

[0051] Comparative Example 2 This comparative example provides a method for preparing carbon black for plastics. The difference between this method and Example 1 is that in step (2), the modified liquid is provided by Preparation Example 5, and other parameters remain unchanged.

[0052] Comparative Example 3 This comparative example provides a method for preparing carbon black for plastics. The difference between this method and Example 1 is that in step (2), the modified liquid is provided by Preparation Example 6, and other parameters remain unchanged.

[0053] Performance testing 1. Preparation of plastic masterbatch: By weight percentage, 50 wt% of conventional or modified carbon black (provided in Examples 1-8 and Comparative Examples 1-3), 45 wt% of carrier resin (low-density polyethylene, LDPE), and 3 wt% of dispersant (ethylene bis-stearamide, EBS) are stirred and mixed, melt-blended, and then extruded into plastic strips. After cooling, the extruded plastic strips are cut into uniform plastic masterbatches, and defective particles are removed by sieving.

[0054] (II) Performance Testing The dispersion uniformity of carbon black in plastic was tested using a rheometer; the color difference value ΔE (aged for 1000h) was calculated using a colorimeter; and the migration property was determined using an accelerated migration test (80℃ / 24h). The results are recorded in Table 1.

[0055] Table 1 sample Dispersibility Color difference ΔE Migration Traditional carbon black masterbatch 60 points (stripes are obvious) 2.8 Surface contamination Example 1 85 points (even) 0.75 No migration Example 2 83 points (even) 0.78 No migration Example 3 84 points (even) 0.77 No migration Example 4 82 points (even) 0.79 No migration Example 5 88 points (even) 0.72 No migration Example 6 90 points (even) 0.68 No migration Example 7 86 points (even) 0.74 No migration Example 8 84 points (even) 0.76 No migration Comparative Example 1 67 points (stripes are obvious) 2.3 Surface contamination Comparative Example 2 74 points (with slight stripes) 1.4 Surface contamination Comparative Example 3 71 points (with slight stripes) 1.6 Surface contamination As shown in Table 1, compared with traditional carbon black masterbatches, the modified carbon black masterbatches provided in Examples 1-8 of this application exhibit uniform dispersion with no streaks, representing an improvement of approximately 42%; and the color difference ΔE after aging for 1000 hours is only about 0.7, an improvement of approximately 75%. Example 6 is considered the best. In migration tests, it also exhibits excellent color fastness, with no carbon black migration and no contamination on the mold surface, completely solving the problems of low color fastness and easy mold contamination.

[0056] Compared to Example 1, Comparative Example 1 used paraffin emulsion to modify carbon black. The resulting modified carbon black masterbatch had poor dispersibility, still exhibiting obvious streaks, large color differences, and contamination on the mold surface. This demonstrates that using the polyethylene wax emulsion of this application is crucial for improving the surface properties of carbon black.

[0057] Compared with Example 1, Comparative Examples 2 and 3, the modified carbon black masterbatches prepared by using isomeric alcohol polyoxyethylene ether or nonylphenol polyoxyethylene ether alone as emulsifiers did not significantly improve color difference and carbon black migration contamination during processing. This indicates that the combination of these two isomeric alcohol polyoxyethylene ether or nonylphenol polyoxyethylene ether substances as a composite emulsifier helps to improve the surface modification effect of carbon black.

[0058] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A preparation process for plastic carbon black based on polyethylene wax modification, characterized in that, It includes: (1) The raw carbon black is crushed and then graded; (2) The treated carbon black particles are subjected to rotary granulation. During the granulation process, a modifying liquid is sprayed so that the modified liquid droplets collide and adsorb with the rotating carbon black particles to obtain spherical carbon black particles. (3) The obtained spherical carbon black particles were dried and cured by hot air, and the modified carbon black particles were collected. The modified liquid is a polyethylene wax emulsion, and the solid content of polyethylene wax in the modified liquid is 28-42 wt%.

2. The preparation process of plastic carbon black based on polyethylene wax modification according to claim 1, characterized in that, The amount of polyethylene wax added to the modified liquid is 2.8-5.2 wt% of the carbon black particles.

3. The preparation process of plastic carbon black based on polyethylene wax modification according to claim 1, characterized in that, In the process of preparing spherical carbon black particles, the modified liquid is atomized into micron-sized droplets using a centrifugal atomizing nozzle. The atomization pressure is 0.15-0.25 MPa, and the droplet size is ≤50 μm.

4. The preparation process of plastic carbon black based on polyethylene wax modification according to claim 1, characterized in that, The spherical carbon black particles are prepared using a rotary granulator, with the internal temperature of the granulator controlled at 120-150℃.

5. The preparation process of plastic carbon black based on polyethylene wax modification according to claim 1, characterized in that, During the hot air drying and curing process, the hot air temperature is 180-220℃ and the wind speed is 1-2m / s.

6. The preparation process of plastic carbon black based on polyethylene wax modification according to claim 5, characterized in that, During the hot air drying and curing process, the drying time is 10-15 seconds.

7. The preparation process of plastic carbon black based on polyethylene wax modification according to claim 1, characterized in that, After the spherical carbon black particles are dried and cured by hot air, the process also includes the step of collecting the finished modified carbon black particles using a cyclone separator and a bag filter.

8. The preparation process of plastic carbon black based on polyethylene wax modification according to claim 1, characterized in that, In step (1), the raw carbon black is pulverized using a fluidized bed jet mill at a pressure of 0.4-0.6 MPa and a temperature of 70-80℃ to obtain preliminary pulverized particles of 50-100 nm. Subsequently, a centrifugal air classifier is used at a speed of 2000-3000 rpm and a classification accuracy of D90≤50 nm to screen carbon black particles with a particle size of 20-50 nm and remove coarse particles.

9. The preparation process of plastic carbon black based on polyethylene wax modification according to claim 1, characterized in that: The preparation method of the modified liquid includes: Oxidized polyethylene is heated to a molten state at 130-150°C, and a composite emulsifier is added and stirred to form a primary emulsion. The composite emulsifier is formed by compounding isomeric alcohol polyoxyethylene ether and nonylphenol polyoxyethylene ether at a mass ratio of 1:0.3-0.5, and the amount of the composite emulsifier is 6-8 wt% of the mass of the oxidized polyethylene. The primary emulsion was mixed with water and homogenized using a high-pressure homogenizer to control the droplet size of the wax droplets within 0.1-1 μm, thus obtaining a stable modified liquid.

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