High-quality carbon black powder usnig general carbon black and recycled carbon black, and method for manufacturing same

Abstract

Disclosed are a high-quality carbon black powder using general carbon black and recycled carbon black, and a method for manufacturing same. More specifically, disclosed are a high-quality carbon black powder using general carbon black and recycled carbon black, and a method for manufacturing same, in which general carbon black and recycled carbon black are mixed and efficiently pelletized to improve productivity, reduce production process costs, and enhance product quality, thereby securing economic feasibility.

Description

High-quality carbon black powder using general carbon black and recycled carbon black and its manufacturing method

[0001] The present invention relates to a high-quality carbon black powder using general carbon black and recycled carbon black and a method for producing the same, and more specifically, to a high-quality carbon black powder using general carbon black and recycled carbon black and a method for producing the same, which can secure economic feasibility by improving product quality while reducing the cost of the production process by mixing general carbon black and recycled carbon black and efficiently pelletizing them to improve productivity.

[0002]

[0003] Carbon black refers to an aggregate of very fine spherical particles obtained through the incomplete combustion of hydrocarbons or carbon-containing compounds. Carbon black forms primary particles in a reactor, and these primary particles fuse together to form grape-shaped aggregates. Meanwhile, carbon black can be broadly divided into acetylene black and furnace black. Among these, furnace black has the advantage of being inexpensive, but has the disadvantage of being difficult to achieve high crystallinity compared to acetylene black.

[0004] Carbon black's physical properties influence the quality of the materials it is used in. These properties include crystallinity, specific surface area, structure, and particle size. Carbon black's properties can be tailored through various post-treatments. Carbon black is used in a variety of fields, including as an industrial additive, industrial paints, coating compositions, and various printed materials.

[0005] In particular, carbon black, used in tire manufacturing, is an essential additive that enhances the bonding strength of rubber, the main component of tires, and requires a purity of 99% or higher. Furthermore, pyrolysis is a widely used method for recovering carbon black from waste tires.

[0006] Accordingly, research is being conducted on carbon black recycling methods to establish a circular economy for waste tires. Recycled carbon black (r-CB) is a product processed from the char produced by the pyrolysis of waste tires. Currently, tire manufacturers use it in some tire compound manufacturing processes at concentrations of approximately 1 to 5 wt%.

[0007] However, with the strengthening of ESG regulations in the future, the use of recycled carbon black is expected to increase further. Consequently, the need for eco-friendly carbon black, which incorporates and mixes recycled carbon black into the production process of standard carbon black, is increasing. Eco-friendly carbon black allows for higher recycled carbon black inputs than conventional simple input methods and offers more stable physical properties, making it highly likely to be utilized by tire manufacturers in the future.

[0008]

[0009] In view of the above-described technical problems, the present invention aims to provide a high-quality carbon black powder using general carbon black and regenerated carbon black and a method for producing the same, which can secure economic feasibility by improving product quality while reducing the cost of the production process by mixing general carbon black and regenerated carbon black and efficiently pelletizing them to improve productivity.

[0010]

[0011] In order to achieve the above object, a method for producing high-quality carbon black powder using general carbon black and regenerated carbon black according to an embodiment of the present invention comprises the steps of: (a) transporting general carbon black produced through a reactor of a carbon black production device and regenerated carbon black fed into a reprocessing storage tank to a process bag filter to mix the general carbon black and the regenerated carbon black; (b) crushing the general carbon black and regenerated carbon black mixed in the process bag filter with a crusher; and (c) co-pelletizing the crushed product to form pellets, and then drying the pellets to form carbon black powder.

[0012] In the above step (a), during the mixing, the general carbon black and regenerated carbon black and tail gas are separated in the process bag filter.

[0013] In the above step (a), the general carbon black is used in which the oil absorption number (OAN) value is increased by 1 to 5 in the reactor.

[0014] It is preferable to use the above general carbon black having an oil absorption number (OAN) value of 91 to 96 ml / 100g.

[0015] In the above step (a), the general carbon black is mixed in a ratio of 85 to 95 wt% and the recycled carbon black is mixed in a ratio of 5 to 15 wt%.

[0016] It is more preferable to mix the above-mentioned recycled carbon black at 8 to 12 wt%.

[0017] In the above step (b), the crushing is performed using any one selected from among a hammer mill, a high-speed mixer, a ball mill, and an air jet mill.

[0018] In the above step (c), during the co-pelletizing, a binder, an emulsion solution, and a solvent are added together to the pulverized powder.

[0019]

[0020] In order to achieve the above object, a high-quality carbon black powder using general carbon black and recycled carbon black according to an embodiment of the present invention is a carbon black powder manufactured by a method for manufacturing high-quality carbon black powder using general carbon black and recycled carbon black, and the carbon black powder is characterized in that it contains 85 to 95 wt% of general carbon black and 5 to 15 wt% of recycled carbon black.

[0021] The above general carbon black is used with an oil absorption number (OAN) value increased by 1 to 5.

[0022] It is preferable to use the above general carbon black having an oil absorption number (OAN) value of 91 to 96 ml / 100g.

[0023] It is more preferable that the above-mentioned regenerated carbon black contains 8 to 12 wt%.

[0024]

[0025] The high-quality carbon black powder and the manufacturing method thereof using general carbon black and recycled carbon black according to the present invention can secure economic feasibility by improving product quality while reducing the cost of the production process by mixing general carbon black and recycled carbon black and efficiently pelletizing them to improve productivity.

[0026] To this end, the high-quality carbon black powder and the manufacturing method thereof using general carbon black and recycled carbon black according to the present invention can improve the phenomenon of deterioration of the physical properties of carbon black powder and rubber composition by using general carbon black whose oil absorption number (OAN) value, which is a tensile property affecting factor, is increased by 1 to 5 by changing the operating conditions of the reactor.

[0027] As a result, the high-quality carbon black powder and the manufacturing method thereof using general carbon black and regenerated carbon black according to the present invention can efficiently produce high-quality carbon black powder like carbon black made only of general carbon black while increasing the amount of regenerated carbon black input by mixing and pelletizing general carbon black and regenerated carbon black.

[0028] In addition, the carbon black powder manufactured by the method according to the present invention can improve product quality without causing a decrease in physical properties even when the amount of recycled carbon black input is increased when used in the production of various products, particularly tires, plastics, and other rubber-based products, and this can contribute to the production of sustainable products by suggesting an environmentally friendly and economical manufacturing process.

[0029] In addition to the effects described above, specific effects of the present invention are described below while explaining specific details for carrying out the invention.

[0030]

[0031] Figure 1 is a process flow diagram showing a method for manufacturing high-quality carbon black powder using general carbon black and recycled carbon black according to an embodiment of the present invention.

[0032] Figure 2 is a process schematic diagram showing a method for manufacturing high-quality carbon black powder using general carbon black and recycled carbon black according to an embodiment of the present invention.

[0033]

[0034] The above-described objects, features, and advantages will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can easily practice the technical idea of ​​the present invention. In describing the present invention, if it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0035] Any details not described in this specification that can be sufficiently technically inferred by a person skilled in the art will be omitted.

[0036] In this specification, the phrase "any component is disposed "on (or below)" a component or "on (or below)" a component may mean not only that any component is disposed in contact with the upper surface (or lower surface) of said component, but also that another component may be interposed between said component and any component disposed on (or below) said component.

[0037] As used herein, singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as "contains," "has (has)," or "includes" should not necessarily be construed as including all components described in the specification, and should be construed to mean that some of the components may not be included, or that additional components may be included.

[0038] Hereinafter, with reference to the attached drawings, a detailed description will be given of a high-quality carbon black powder and a manufacturing method thereof using general carbon black and recycled carbon black according to a preferred embodiment of the present invention.

[0039]

[0040] FIG. 1 is a process flow diagram showing a method for manufacturing high-quality carbon black powder using general carbon black and regenerated carbon black according to an embodiment of the present invention, and FIG. 2 is a process schematic diagram showing a method for manufacturing high-quality carbon black powder using general carbon black and regenerated carbon black according to an embodiment of the present invention.

[0041] Referring to FIGS. 1 and 2, a method for manufacturing high-quality carbon black powder using general carbon black and regenerated carbon black according to an embodiment of the present invention includes a general carbon black and regenerated carbon black mixing step (S110), a grinding step (S120), and a pelletizing and drying step (S130).

[0042]

[0043] Mixture of regular carbon black and recycled carbon black

[0044] In the general carbon black and regenerated carbon black mixing step (S110), the general carbon black produced through the reactor of the carbon black manufacturing device and the regenerated carbon black fed into the reprocessing storage tank are transferred to the process bag filter (120) to mix the general carbon black and the regenerated carbon black.

[0045] In the specification of the present invention, the term general carbon black may be referred to as normal carbon black, normal carbon black, general CB and n-CB, respectively, and these are all defined as being homonyms.

[0046] During this mixing, the normal carbon black and regenerated carbon black and the tail gas are separated by the process bag filter (120). In this way, the tail gas separated from the carbon black by the process bag filter (120) can be supplied to a dryer or utilized as boiler fuel gas.

[0047] At this stage, it is preferable to mix the general carbon black and the recycled carbon black in a ratio of 85 to 95 wt% of the general carbon black and 5 to 15 wt% of the recycled carbon black. More preferably, it is preferable to mix the general carbon black and the recycled carbon black in a ratio of 88 to 92 wt% of the general carbon black and 8 to 12 wt% of the recycled carbon black.

[0048] When the recycled carbon black is mixed in an amount of less than 5 wt% relative to the total 100 wt% of general carbon black and recycled carbon black, the amount of recycled carbon black input may be too small, which may result in insufficient recycling of the recycled carbon black, resulting in insufficient economic feasibility. Conversely, when the recycled carbon black is mixed in an amount of more than 15 wt% relative to the total 100 wt% of general carbon black and recycled carbon black, the amount of recycled carbon black input may be too excessive, which may result in deterioration of the physical properties of the carbon black powder and the rubber composition containing the carbon black powder.

[0049] In particular, it is preferable to use general carbon black with an oil absorption number (OAN) value increased by 1 to 5 in the reactor. More specifically, it is preferable to use general carbon black with an oil absorption number (OAN) value of 91 to 96 ml / 100g. In this way, it was confirmed through experiments that when general carbon black was introduced with the oil absorption number (OAN), which is a factor influencing tensile properties, increased by 1 to 5 due to changes in the operating conditions of the reactor, the deterioration of the physical properties of the carbon black powder and rubber composition was significantly improved.

[0050]

[0051] smash

[0052] In the crushing step (S120), the general carbon black and regenerated carbon black mixed in the process bag filter (120) are crushed by a crusher (140).

[0053] In this step, the grinding can be performed using any one selected from among a hammer mill, a high-speed mixer, a ball mill, and an air jet mill, and among these, grinding using a high-speed rotating hammer mill is preferred. Through this grinding step (S120), the general carbon black and the regenerated carbon black can be ground into fine powder having an average diameter of 500 μm or less.

[0054]

[0055] Pelletizing and drying

[0056] In the pelletizing and drying step (S130), the crushed material is co-pelletized to form pellets, and then dried to form carbon black powder.

[0057] For this purpose, a pelletizer and a dryer (160) may be sequentially installed at the rear end of the crusher (140).

[0058] In order to facilitate the transport and handling of carbon black, which is a fine powder, during co-pelletizing, it is preferable to add a binder, an emulsion solution, and a solvent to the pulverized powder. In this way, during co-pelletizing, a binder, an emulsion solution, and a solvent are added together to the pulverized powder, and the resulting powder is granulated into 1 to 2 mm-sized granules through a rotating centrifugal action, thereby pelletizing the result.

[0059] Thereafter, moisture is evaporated using a heat source and air flow, and the particles of the pulverized material are dried to obtain carbon black particles. During this drying process, it is preferable to dry at 150 to 250°C for 1 to 2 hours to remove moisture (50% → less than 0.5%) within the pulverized material. Furthermore, it is preferable to use a rotating cylinder-type dryer for drying, and the desired moisture content can be obtained by precisely controlling the temperature and time during the drying process.

[0060] The carbon black powder that has completed these pelletizing and drying steps (S130) can be packaged as a final product through a packaging process after exiting the dryer.

[0061] With this, the method for producing high-quality carbon black powder using general carbon black and regenerated carbon black according to an embodiment of the present invention can be completed.

[0062]

[0063] The high-quality carbon black powder and the manufacturing method thereof using general carbon black and regenerated carbon black according to the above-described embodiment of the present invention can secure economic feasibility by improving product quality while reducing the cost of the production process by mixing general carbon black and regenerated carbon black and efficiently pelletizing them to improve productivity.

[0064] To this end, the high-quality carbon black powder and the manufacturing method thereof using general carbon black and recycled carbon black according to an embodiment of the present invention can improve the phenomenon of deterioration of the physical properties of carbon black powder and rubber composition by using general carbon black whose oil absorption number (OAN) value, which is a tensile property affecting factor, is increased by 1 to 5 by changing the operating conditions of the reactor.

[0065] As a result, the high-quality carbon black powder and the manufacturing method thereof using general carbon black and regenerated carbon black according to the embodiment of the present invention can efficiently produce high-quality carbon black powder like carbon black made only of general carbon black while increasing the input amount of regenerated carbon black by mixing and pelletizing general carbon black and regenerated carbon black.

[0066] In addition, the carbon black powder manufactured by the method according to the embodiment of the present invention can improve product quality without causing a decrease in physical properties even when the amount of recycled carbon black input is increased when used in the production of various products, particularly tires, plastics, and other rubber-based products, and this can contribute to the production of sustainable products by suggesting an environmentally friendly and economical manufacturing process.

[0067]

[0068] Example

[0069] Hereinafter, the structure and operation of the present invention will be described in more detail through preferred embodiments of the present invention. However, these are presented as preferred examples of the present invention and should not be construed as limiting the present invention in any way.

[0070] Anything not described here will be omitted as it is technically feasible for those skilled in this field to infer.

[0071]

[0072] 1. Lab Mixed Evaluation

[0073] Table 1 below shows the results of lab mixing evaluations of carbon black powders produced at different mixing ratios of normal CB (normal carbon black) and r-CB (recycled carbon black) and rubber compositions using the same. At this time, for the purpose of confirming the tendency before co-pelletizing, a simple mixing method was applied in the same manner as tire manufacturers to mix normal carbon black and recycled carbon black at the mixing ratios shown in Table 1 on a lab scale. At this time, Carbon Black N660, a trade name, was used as the normal carbon black, and a product from Enrestec was obtained and used as the recycled carbon black.

[0074] In addition, a master batch was prepared by adding carbon black powder, zinc oxide, stearic acid, TDAE oil, and 6PPD and RD as additives to raw rubber, respectively, and stirring at 150°C for 5 minutes. Subsequently, S (Sulfur) and NS were added to the master batch, and stirring was performed at 110°C for 2 minutes to prepare a rubber composition for tires.

[0075]

[0076] (1) Microcrystalline properties

[0077] 1) IA (Iodine Adsorption Number)

[0078] This method analyzes the specific surface area of ​​carbon black based on its iodine adsorption capacity. Measurements were conducted according to ASTM-D1510. The higher the iodine adsorption capacity, the smaller the carbon black particle size. Conversely, the lower the iodine adsorption capacity, the larger the particle size.

[0079]

[0080] 2) OAN (Oil Absorption number)

[0081] The OAN value is an evaluation of the oil absorption of DBP (dibutyl phthalate) that can be contained in 100g of carbon black. OAN was measured according to the analysis method based on ASTM D2414 (measuring the amount of dibutyl phthalate oil absorbed by 100g of carbon black (ml / 100g)). A higher OAN value indicates a more complex and developed carbon black structure.

[0082]

[0083] 3) Tint

[0084] Tint was measured according to ASTM-D3265. This value represents the color of carbon black. A higher Tint indicates a smaller particle size and a simpler structure. Conversely, a lower Tint indicates a larger particle size and a more complex structure.

[0085]

[0086] 4) Ash

[0087] Ash is used to measure impurities in carbon black, and measures the content of inorganic impurities remaining after burning carbon black at a temperature of 550℃.

[0088] The reason for measuring ash is that when producing carbon black compounds, if the ash content is high, the carbon black is not effectively dispersed, which is due to the reduction in the surface area of ​​the carbon black compound and the hindering of interaction with the rubber.

[0089] In the present invention, when mixing general carbon black and recycled carbon black, the ash content is used as a numerical value to predict and prove the mixing ratio of recycled carbon black.

[0090]

[0091] 5) Pattern viscosity (ML1+4, 100℃)

[0092] Mooney viscosity was measured for each rubber composition manufactured in each example according to ASTM D 1646: RUBBER FROM NATURAL OR SYNTHETIC SOURCES-VISCOSITY AND VULCANIZATION CHARACTERISTICS (MOONEY VISCOMETER). 50-ML1+4(100℃), where 50-M is a viscosity number, L indicates that a large rotor was used, 1 means that the motor was preheated for 1 minute before operating, 4 means the specified measurement time, and 100℃ means the measurement temperature. The higher the Mooney viscosity, the worse the dispersibility of the components in the rubber composition.

[0093]

[0094] (2) Vulcanizing properties

[0095] Tensile stress (M300) and elongation (EL) were measured according to ASTM 412-98a: STANDARD TEST METHODS FOR VULCANIZED RUBBER AND THERMOPLASTIC ELASTOMERS-TENSION.

[0096]

[0097] [Table 1]

[0098]

[0099] As shown in Table 1 above, the results of the physical property measurement of the carbon black powder of the mixed product on a lab scale showed that when 15 wt% or more of recycled carbon black was simply added, the physical properties of the carbon black that affect the rubber properties such as IA and OAN changed.

[0100] In addition, the analysis results of the rubber compound also showed that a decrease in tensile properties occurred when simply adding 15 wt% or more of recycled carbon black. Through this, it was confirmed that when simply mixing general CB and r-CB, it is desirable to add r-CB at 15 wt% or less.

[0101]

[0102] 2. Trial production evaluation (simple co-pelletizing / co-pelletizing after changing operating conditions)

[0103] Table 2 below shows the results of a pilot production evaluation of carbon black powder produced by simple co-pelletizing with a mixing ratio of general CB (90 wt%) and r-CB (10 wt%) and a rubber composition using the same, and Table 3 shows the results of a pilot production evaluation of carbon black powder produced by co-pelletizing with a mixing ratio of general CB (90 wt%) and r-CB (10 wt%) after changing the operating conditions of the reactor and a rubber composition using the same.

[0104] At this time, recycled carbon black was input up to 10 wt% based on daily production volume. 10 tons of recycled carbon black were input for 8 hours on the on-site production line, and co-pelletizing was performed for 4 hours by simply mixing with general carbon black from the process bag filter stage without changing the reactor operating conditions. For the remaining 4 hours, the concentration of the additive in the reactor was controlled to 0.1 to 1%, the input amount was lowered to 1 to 5 L, and the OAN (Oil Absorption Number) value was increased to 1 to 5.

[0105]

[0106] [Table 2]

[0107]

[0108]

[0109] [Table 3]

[0110]

[0111] First, as can be seen from Table 2 above, the physical properties of the carbon black powder and rubber composition after simple co-pelletizing were measured, and although the physical properties of the carbon black powder were at an equivalent level, a decrease in the physical properties of the rubber composition was observed compared to general carbon black.

[0112] However, when compared with the physical properties results obtained at the lab scale, the tensile properties (M300, Elong, TB) showed an increasing trend, and it was determined that the degree of mixing of general carbon black and recycled carbon black was improved through the co-pelletizing method starting from the press bag filter process compared to the simple mixing method such as the lab scale evaluation.

[0113] In particular, it was found that at a mixing ratio of 10 wt% of recycled carbon black, it provides economic and environmental benefits while maintaining properties similar to those of general carbon black, and it was confirmed that some deterioration in properties occurs as the content of recycled carbon black increases at a mixing ratio of 15 to 25 wt% of recycled carbon black.

[0114] Therefore, it was determined that the optimal mixing ratio of recycled carbon black was in the range of 5 to 10 wt%, which provides a balance of economic efficiency and physical properties.

[0115] Meanwhile, as can be seen from Table 3 above, the results of evaluating the properties of carbon black powder and rubber composition after co-pelletizing after changing the operating conditions of the reactor by inputting the mixing ratio of recycled carbon black at 5 wt%, 10 wt%, 15 wt%, and 25 wt% showed that all properties except the ash content were improved compared to the simple co-pelletizing properties, and it was confirmed that co-pelletized carbon black at the level of general carbon black could be produced.

[0116]

[0117] 3. Conclusion

[0118] In conclusion, the two evaluation results obtained through the co-pelletizing process confirmed that a series of improvements in the properties of the blend of regular carbon black and recycled carbon black were achieved.

[0119] In particular, the results of increasing the OAN (Oil Absorption Number) value in the reactor showed that the surface area increased as the OAN value increased, indicating a change in the surface properties of the material.

[0120] In addition, it was confirmed that the same level of properties as general carbon black were secured as a result of increasing the OAN value in the rubber composition properties.

[0121] In particular, the OAN value, which is one of the major influencing factors determining tensile properties (M300, Elongation, TB), was improved, which means that the phenomenon of deterioration in properties due to the introduction of recycled carbon black was improved, suggesting the efficiency of the new manufacturing method and successful improvement in properties.

[0122]

[0123] While the above description focuses on specific embodiments of the present invention, those skilled in the art will appreciate that various modifications and variations can be made. Such modifications and variations, as long as they do not depart from the scope of the technical concept provided by the present invention, are considered to be within the scope of the present invention. Therefore, the scope of the present invention should be determined by the claims set forth below.

[0124]

[0125] [Explanation of symbols]

[0126] S110: Mixing stage of regular carbon black and recycled carbon black

[0127] S120: Crushing stage

[0128] S130: Pelletizing and drying stage

Claims

1. (a) A step of mixing the general carbon black and the regenerated carbon black produced through the reactor of the carbon black manufacturing device and the regenerated carbon black fed into the reprocessing storage tank by transporting them to a process bag filter; (b) a step of crushing the mixed general carbon black and regenerated carbon black in the above process bag filter using a crusher; and (c) a step of co-pelletizing the pulverized material to make pellets, and then drying the pellets to form carbon black powder; characterized by including, A method for producing high-quality carbon black powder using general carbon black and recycled carbon black.

2. In paragraph 1, In step (a) above, In the above mixing, the general carbon black and regenerated carbon black and tail gas are separated by the process bag filter, characterized in that A method for producing high-quality carbon black powder using general carbon black and recycled carbon black.

3. In paragraph 1, In step (a) above, The above general carbon black is characterized in that it uses an oil absorption number (OAN) value increased by 1 to 5 in the reactor. A method for producing high-quality carbon black powder using general carbon black and recycled carbon black.

4. In paragraph 3, The above general carbon black is characterized by having an oil absorption number (OAN) value of 91 to 96 ml / 100g. A method for producing high-quality carbon black powder using general carbon black and recycled carbon black.

5. In paragraph 1, In step (a) above, Characterized in that it is mixed in a ratio of 85 to 95 wt% of the above general carbon black and 5 to 15 wt% of the recycled carbon black. A method for producing high-quality carbon black powder using general carbon black and recycled carbon black.

6. In paragraph 5, The above-mentioned regenerated carbon black is characterized by being mixed at 8 to 12 wt%. A method for producing high-quality carbon black powder using general carbon black and recycled carbon black.

7. In paragraph 1, In step (b) above, The above grinding is characterized by using one selected from a hammer mill, a high-speed mixer, a ball mill, and an air jet mill. A method for producing high-quality carbon black powder using general carbon black and recycled carbon black.

8. In paragraph 1, In step (c) above, In the above co-pelletizing, a binder, an emulsion solution and a solvent are added together to the pulverized pulverized material. A method for producing high-quality carbon black powder using general carbon black and recycled carbon black.

9. Carbon black powder manufactured by a high-quality carbon black powder manufacturing method using general carbon black and regenerated carbon black according to any one of clauses 1 to 8, The above carbon black powder is characterized in that it contains 85 to 95 wt% of general carbon black and 5 to 15 wt% of recycled carbon black. High quality carbon black powder using regular carbon black and recycled carbon black.

10. In paragraph 9, The above general carbon black is characterized by using an oil absorption number (OAN) value increased by 1 to 5. High quality carbon black powder using regular carbon black and recycled carbon black.

11. In paragraph 10, The above general carbon black is, Characterized by having an oil absorption number (OAN) value of 91 to 96 ml / 100g, High quality carbon black powder using regular carbon black and recycled carbon black.

12. In paragraph 9, The above-mentioned regenerated carbon black is characterized by containing 8 to 12 wt%, High quality carbon black powder using regular carbon black and recycled carbon black.

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