Carbon black, method for producing the same, and its use

Abstract

To provide carbon black with a low content of impurities produced from recycled carbon black, and a method for producing the same.SOLUTION: Carbon black of the present invention is produced by heat treating recycled carbon black, and satisfies the conditions of having a volatile substance content of less than 3.4 wt.% and polycyclic aromatic hydrocarbons of approximately 2 ppm or less. Preferably, the oil adsorption rate of the carbon black is approximately 150 mL / 100 g or less, and the nitrogen adsorption specific surface area is approximately 40 m2 / g or more.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This application claims priority to Taiwan Patent Application No. 113103570, filed January 30, 2024. This application further claims priority to Chinese Patent Application No. 202510027545.X, filed January 8, 2025. Each of these applications is incorporated herein by reference in its entirety.

[0002] The present disclosure relates to carbon black and its applications, and in particular to low-volatility carbon black obtained from recycled carbon black and its applications. [Background technology]

[0003] According to statistics, Taiwan produces approximately 120,000 tons of waste tires every year, and an average of 10,000 tons of waste tires need to be processed each month. Processed waste tires are mainly used as supplementary fuels and renewable raw materials, and can be recycled by pyrolysis into oil and carbon black.

[0004] However, currently, carbon black obtained by pyrolysis (recycled carbon black) contains a large amount of impurities such as zinc oxide and silica, so recycled carbon black can only be used as a low-level filler with little economic value, which affects the recycling rate of waste tires. Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above, it is an object of the present disclosure to provide carbon black with low impurity content that is made from recycled carbon black. [Means for solving the problem]

[0006] Based on the above objectives, the present disclosure provides the following carbon blacks, methods for preparing carbon blacks, uses of carbon blacks, and coatings or inks.

[0007] Item 1. Carbon black produced by recycling carbon black and meeting the following conditions: volatile matter content is less than 3.4% by weight.

[0008] Item 2. The carbon black according to Item 1, having a volatile substance content of 3.2% by weight or less.

[0009] Item 3. The carbon black according to Item 1 or 2, having a volatile substance content of more than about 0% by weight and not more than about 2.9% by weight.

[0010] Item 4. The carbon black according to Item 1, further satisfying the following condition: an oil adsorption rate of about 150 mL / 100 g or less.

[0011] Item 5. The carbon black according to Item 4, having an oil adsorption rate of about 140 mL / 100 g or less.

[0012] Item 6. The carbon black according to Item 4 or 5, having an oil adsorption rate of between about 100 mL / 100 g and about 135 mL / 100 g.

[0013] Item 7. The following conditions are met: Nitrogen adsorption specific surface area is approximately 40m 2 / g or more.

[0014] Item 8. Nitrogen adsorption specific surface area is approximately 60m 2 / g or more.

[0015] Item 9. Nitrogen adsorption specific surface area is approximately 65m 2 / g and approximately 150m 2 / g.

[0016] Item 10. The carbon black according to any one of Items 1, 2, 4, 5, 7, and 8, further satisfying the following condition: polycyclic aromatic hydrocarbons are about 2 ppm or less.

[0017] Item 11. Carbon black manufactured by recycling and meeting the following conditions: a volatile matter content of more than about 0% by weight and not more than about 2.9% by weight; (1) an oil adsorption rate between about 100 mL / 100 g and about 135 mL / 100 g; and (2) a nitrogen adsorption specific surface area of about 65 m. 2 / g and approximately 150m 2 / g, and (3) polycyclic aromatic hydrocarbons of about 2 ppm or less.

[0018] Item 12. A method for preparing the carbon black according to any one of Items 1 to 11, comprising: (1) providing recycled carbon black; and (2) heat-treating the recycled carbon black.

[0019] Item 13. The method according to item 12, wherein the recycled carbon black is obtained by pyrolysis of tires.

[0020] Item 14. The method according to item 12 or 13, wherein the heat treatment is carried out at a temperature of about 800°C or higher.

[0021] Item 15. The method according to Item 14, wherein the heat treatment continues for about 10 minutes or more.

[0022] Item 16. The method according to item 12, further comprising the step of (3) modifying the recycled carbon black after the heat treatment.

[0023] Item 17. The method according to Item 16, wherein the modification is carried out using an oxidizing agent.

[0024] Item 18. The method according to item 16 or 17, wherein the modification is carried out using ozone.

[0025] Item 19. Use of the carbon black according to any one of Items 1 to 11 in a coating or ink.

[0026] Item 20. A coating or ink containing the carbon black according to any one of Items 1 to 11. [Effects of the Invention]

[0027] The present disclosure can effectively reduce impurities in recycled carbon black through a simple process, thereby improving the applicability and economic value of recycled carbon black. [Brief explanation of the drawings]

[0028] [Figure 1] (a) shows the X-ray diffraction analysis pattern of the recovered carbon black after heat treatment, and (b) shows the X-ray diffraction analysis pattern of the recovered carbon black before heat treatment. DETAILED DESCRIPTION OF THE INVENTION

[0029] In this disclosure, "between X and Y" is equivalent to "X to Y," and includes the extreme values X and Y.

[0030] In this disclosure, the term "about" can be considered to modify a term or numerical value such that the term or numerical value is not an absolute value and cannot be found in the prior art. In some embodiments, the term "about" encompasses a numerical value within 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10% of a measured value (including such value), or any intermediate range (such as ±2% to 6%), which includes at least the degree of expected experimental, technical, and instrumental error of any method, assay, or measurement.

[0031] The carbon black provided by the present disclosure is obtained by recycling carbon black and meets the following criteria: a volatile matter content of less than 3.4 wt%. In some embodiments, the volatile matter content of the carbon black is 3.2 wt% or less. In some embodiments, the volatile matter content of the carbon black is greater than about 0 wt% and less than or equal to about 2.9 wt%. The volatile matter content (wt%) of the carbon black can also be equal to, less than, or between any two of the following values: about 2.9, about 2.6, about 2.3, about 2.0, about 1.7, about 1.4, about 1.1, about 0.8, about 0.5, about 0.1, and about 0.01. For example, in some embodiments, the volatile matter content is between about 0.01 wt% and about 0.8 wt%, and in other embodiments, the volatile matter content is between about 1.4 wt% and about 2.9 wt%.

[0032] The carbon black provided by the present disclosure may further satisfy the following conditions: an oil adsorption rate of about 150 mL / 100 g or less. In some embodiments, the oil adsorption rate is about 140 mL / 100 g or less. In some embodiments, the oil adsorption rate is between about 100 mL / 100 g and about 135 mL / 100 g. In some embodiments, the oil adsorption rate can be equal to or less than any of the following values, or can be between any two of the following values: about 102 mL / 100 g, about 105 mL / 100 g, about 108 mL / 100 g, about 110 mL / 100 g, about 113 mL / 100 g, about 115 mL / 100 g, about 118 mL / 100 g, about 120 mL / 100 g, about 123 mL / 100 g, about 125 mL / 100 g, about 128 mL / 100 g, about 130 mL / 100 g, about 132 mL / 100 g, and about 134 mL / 100 g.

[0033] The carbon black provided by the present disclosure may further satisfy the following conditions: 2 / g or more. In some embodiments, the nitrogen adsorption specific surface area is about 60 m 2 / g or greater. In some embodiments, the nitrogen adsorption specific surface area is about 65 m 2 / g and approximately 150m 2 In some embodiments, the nitrogen adsorption specific surface area can be equal to or less than any of the following values, or can range between any two of the following values: about 67 m 2 / g, approx. 69m 2 / g, approx. 70m 2 / g, approx. 75m 2 / g, approx. 80m 2 / g, approx. 85m 2 / g, approx. 90m 2 / g, approx. 95m 2 / g, about 100m 2 / g, approx. 105m 2 / g, approx. 110m 2 / g, approx. 115m 2 / g, approx. 120m 2 / g, approx. 125m 2 / g, approx. 130m 2 / g, approx. 135m 2 / g, approx. 140m 2 / g, approx. 145m 2 / g and approximately 150m 2 / g.

[0034] The carbon black provided by the present disclosure may further satisfy the following condition: about 2 ppm or less polycyclic aromatic hydrocarbons (PAHs). In some embodiments, the polycyclic aromatic hydrocarbon content may be equal to or less than any of the following values, or may be between any two of the following values: about 2 ppm, about 1.5 ppm, about 1.0 ppm, about 0.5 ppm, and about 0 ppm. In another embodiment, the carbon black provided by the present disclosure has a 15 PAH content of between about 0 and about 2 ppm, e.g., between about 0 and about 1.5 ppm, where 15 PAH refers to the following 15 polycyclic aromatic hydrocarbons: benzo[a]pyrene, benzo[e]pyrene, benzo[a]anthracene, benzo[b]fluoranthene, benzo[j]fluoranthene, benzo[k]fluoranthene, chrysene, dibenzo[a,h]anthracene, benzo[g,h,i]perylene, indeno[1,2,3-cd]pyrene, anthracene, fluoranthene, phenanthrene, pyrene, and naphthalene.

[0035] In some embodiments, the carbon black provided by the present disclosure meets the following conditions: a volatile matter content of greater than about 0 wt.% to about 2.9 wt.% or less; and an oil sorption rate of between about 100 mL / 100 g and about 135 mL / 100 g. In other embodiments, the carbon black meets the following conditions: a volatile matter content of greater than about 0 wt.% to about 2.9 wt.% or less; an oil sorption rate of between about 100 mL / 100 g and about 135 mL / 100 g; and an oil sorption rate of between about 65 mL / 100 g and about 135 mL / 100 g. 2 / g and approximately 150m 2 / g.

[0036] In some embodiments, the carbon black provided by the present disclosure meets the following conditions: a volatile matter content of greater than about 0 wt. % and less than or equal to about 2.9 wt. %; and 2 / g and approximately 150m 2 / g. In other embodiments, the carbon black satisfies the following conditions: a volatile matter content of greater than about 0% by weight and less than or equal to about 2.9% by weight; 2 / g and approximately 150m 2 / g; and about 2 ppm or less of polycyclic aromatic hydrocarbons.

[0037] In some embodiments, the carbon black provided by the present disclosure meets the following conditions: a volatile matter content of greater than about 0 wt.% to about 2.9 wt.% or less; and polycyclic aromatic hydrocarbons of less than about 2 ppm. In other embodiments, the carbon black meets the following conditions: a volatile matter content of greater than about 0 wt.% to about 2.9 wt.% or less; an oil adsorption rate of between about 100 mL / 100 g and about 135 mL / 100 g; and polycyclic aromatic hydrocarbons of less than about 2 ppm.

[0038] In some embodiments, the carbon black provided by the present disclosure meets the following criteria: a volatile matter content of greater than about 0 wt.% to about 2.9 wt.%; an oil adsorption rate of between about 100 mL / 100 g and about 135 mL / 100 g; and an oil adsorption rate of about 65 m 2 / g and approximately 150m 2 / g; and about 2 ppm or less of polycyclic aromatic hydrocarbons.

[0039] In some embodiments, the carbon black provided by the present disclosure satisfies the following conditions: an X-ray diffraction analysis (XRD) pattern comprising three characteristic peaks at 2θ positions of about 28° (e.g., 28.38°±0.2), about 47° (e.g., 47.26°±0.2), and about 56° (e.g., 56.08°±0.2). In some embodiments, the carbon black provided by the present disclosure satisfies the following conditions: an XRD pattern comprising four characteristic peaks at 2θ positions of about 28° (e.g., 28.38°±0.2), about 47° (e.g., 47.26°±0.2), about 56° (e.g., 56.08°±0.2), and about 69° (e.g., 69.08°±0.2). In some embodiments, the carbon black provided by the present disclosure satisfies the following criteria: an XRD pattern comprising five characteristic peaks at 2θ positions of about 28° (e.g., 28.38°±0.2), about 47° (e.g., 47.26°±0.2), about 56° (e.g., 56.08°±0.2), about 69° (e.g., 69.08°±0.2), and about 76° (e.g., 76.37°±0.2).

[0040] In some embodiments, the carbon black provided by the present disclosure has an X-ray diffraction pattern substantially as shown in FIG. 1(a).

[0041] In some embodiments, the carbon black provided by the present disclosure meets the following criteria: an oxygen-containing functional group content of about 70% or less as measured by X-ray photoelectron spectroscopy (XPS). In some embodiments, the oxygen-containing functional group content can be less than or equal to any of the following values, or can be between any two of the following values: 68, 64, 59, 54, 49, 44, 39, 35, 30, 25, 20, 15, 10, 5, and 0.

[0042] In some embodiments, the carbon black provided by the present disclosure meets the following criteria: a carbon-carbon bond (C-C) content of about 30% or greater as measured by XPS. In some embodiments, the carbon-carbon bond content can be equal to or greater than any of the following values, or can be between any two of the following values: 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, and 100.

[0043] In some embodiments, the carbon black provided by the present disclosure meets the following criteria: a carbon-oxygen single bond (C-O) content of about 40% or less as measured by XPS. In some embodiments, the carbon-oxygen single bond content can be less than or equal to any of the following values, or can range between any two of the following values: 38, 36, 34, 32, 30, 28, 26, 24, 22, 20, 15, 10, 5, and 0.

[0044] In some embodiments, the carbon black provided by the present disclosure meets the following criteria: a carbon-oxygen double bond (C=O) content of about 20% or less as measured by XPS. In some embodiments, the carbon-oxygen double bond content can be equal to or less than any of the following values, or can range between any two of the following values: 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 5, and 0.

[0045] In some embodiments, the carbon black provided by the present disclosure meets the following criteria: a carboxyl group (COOH) content of about 1% or greater as measured by XPS. In some embodiments, the carboxyl group content can be equal to or greater than any of the following values, or can be between any two of the following values: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18, and 20.

[0046] The present disclosure also provides a method for producing the aforementioned carbon black, the method comprising: preparing recycled carbon black; and subjecting the recycled carbon black to a heat treatment. The resulting carbon black satisfies the aforementioned volatile matter content characteristics, and can also satisfy at least one of the aforementioned characteristics, including oil adsorption rate, nitrogen adsorption specific surface area, and polycyclic aromatic hydrocarbon content, or any combination thereof.

[0047] In this disclosure, recycled carbon black includes, but is not limited to, recycled carbon black purchased from the market and recycled carbon black obtained from tires using conventional processes. For example, recycled carbon black can be produced by the following method: shredding scrap tires; and pyrolyzing the shredded scrap tires to obtain recycled carbon black. In some embodiments, a catalyst can be added to the shredded scrap tires before pyrolysis. Pyrolysis can be carried out at a temperature of about 500°C or less, or at any two of the following temperatures: about 350°C, about 375°C, about 400°C, about 425°C, about 450°C, and about 475°C.

[0048] In the present disclosure, the heat treatment of recycled carbon black can be carried out at a temperature of about 800°C or higher, or at a temperature between any two of the following ranges: about 825°C, about 850°C, about 875°C, about 900°C, about 925°C, about 950°C, about 975°C, about 1000°C, and about 1025°C. The duration of the heat treatment depends on the heat treatment temperature. Generally speaking, it can last for about 10 minutes or more and can be between any two of the following ranges: about 20 minutes, about 30 minutes, about 40 minutes, and about 50 minutes. The heat treatment can be carried out under air or an inert gas (such as nitrogen). The heat treatment can be carried out in a high-temperature furnace, microwave device, or other device capable of high-temperature heat treatment.

[0049] The carbon black manufacturing method provided by the present disclosure may further include modifying the heat-treated recycled carbon black to obtain modified recycled carbon black. In some embodiments, the modification is an oxidation reaction. For example, in some embodiments, the modification is carried out using an oxidizing agent; in other embodiments, the modification is carried out using ozone. The modification time depends on the user's needs. Generally speaking, it can last 20 minutes or more, and can also last any time between any two of the following ranges: about 40 minutes, about 60 minutes, about 80 minutes, about 100 minutes, and about 120 minutes. For example, in some embodiments, the modification time is between about 40 minutes and about 60 minutes; and in other embodiments, the modification time is between about 80 minutes and about 120 minutes.

[0050] The carbon blacks provided by the present disclosure can be used in coatings, inks, or other coating applications (e.g., thin films). The carbon black can be formed into a coating on a substrate by conventional coating methods. In some embodiments, the carbon black is incorporated into inks for electrostatic printing or inkjet printing. In other embodiments, the carbon black is incorporated into paints for coatings.

[0051] [Heat-treated recycled carbon black]

[0052] Production Example 1: Production of Carbon Black 1

[0053] The quartz crucible was placed in a high-temperature furnace and fired at 950°C for 10 minutes to remove impurities. Next, 20.0 g of recycled carbon black PB-365 (manufactured by Enretec) was added to the crucible, and the crucible was placed in a high-temperature furnace (DENG YNG DFH-20) and heat-treated at 950-1000°C for 30 minutes to 1 hour. After the heat treatment, the quartz crucible was placed at room temperature and cooled to obtain Carbon Black 1.

[0054] Production Example 2: Production of Carbon Black 2

[0055] Carbon black 2 was obtained in the same manner as in Production Example 1, except that heat treatment was carried out using a microwave device.

[0056] [Modified recycled carbon black]

[0057] Production Examples 3 and 4: Carbon Black 3 and Carbon Black 4

[0058] According to the conditions shown in Table 1, the carbon material post-modification treatment system disclosed in Taiwan Patent No. 1796678 can be used to modify the aforementioned carbon black 1 to produce carbon black 3 and carbon black 4. The contents of Taiwan Patent No. 1796678 are incorporated herein by reference in their entirety.

[0059] [Table 1]

[0060] Table 2 shows the nitrogen adsorption specific surface area (NSA), oil adsorption rate (OAN) and volatile substance content of the recovered carbon black and the carbon black of Production Examples 1 to 4. The measurement items shown in Table 2 were measured by the following methods.

[0061] [NSA]

[0062] The specific surface area of carbon black was measured in accordance with ASTM D6556. The pressure of gases adsorbed and desorbed on the surface and pores of carbon black at a constant temperature was measured, and the nitrogen surface area was considered to be the sum of the external and internal surface areas according to the BET theory. The specific surface area was calculated using the cross-sectional area of the gas molecule, the volume of the gas molecule, and the weight of the sample.

number

[0063] [OAN]

[0064] Carbon black OAN was measured according to ASTM D2414. Carbon black was quantitatively weighed and had a density of 1.042-1.047 g / cm. 3 The adsorption value was calculated based on the weight of the carbon black sample and the titration amount, and the OAN value was calculated by substituting the following equation:

number

[0065] [Volatile substance content]

[0066] The amount of organic compounds (including, but not limited to, residual oils, adhesives, surface functional groups, etc.) released by calcining carbon black at 950°C for 7 minutes was measured. The weight of the crucible before and after calcining the carbon black was measured, and the loss rate was calculated to obtain the amount of released organic compounds.

[0067] [Table 2]

[0068] As shown in Table 2, the heat-treated recycled carbon black (Production Examples 1 and 2) had a lower volatile matter content than recycled carbon black that was only pyrolyzed, demonstrating that the present disclosure can indeed significantly reduce the content of organic compound impurities in recovered carbon black and improve its purity through heat treatment. The experimental results for modified recycled carbon black (Production Examples 3 and 4) demonstrated that the heat-treated high-purity carbon black (Production Examples 1 and 2) can be further modified according to user needs to obtain desired properties, particularly polarity, dispersibility, light absorption, and colorability. Because the modified carbon black contains oxygen-containing functional groups on its surface, the modified recycled carbon black (Production Example 3) had a higher volatile matter content than the recycled carbon black that was only heat-treated (Production Examples 1 and 2). The longer the modification time (Production Example 4), the more oxygen-containing functional groups accumulated on the carbon black surface, which again meant an increase in the volatile matter content.

[0069] Table 3 shows the results of tests conducted to measure the polycyclic aromatic hydrocarbon content in recycled carbon black (PB-365) before heat treatment, recycled carbon black after heat treatment (Production Example 1), and modified recycled carbon black (Production Example 3) using a gas chromatography mass spectrometer (Agilent 5977B GC / MSD) in accordance with the GS PAH Standard 2019 Edition (AfPS GS 2019.PAK). The 15 PAH content of the recycled carbon black and modified recycled carbon black after heat treatment was 0, indicating that the 15 PAH content of recycled carbon black can be reduced to less than 0.2 ppm by heat treatment.

[0070] [Table 3]

[0071] Table 3-1 shows the results of XPS (PHI Quantera II, ULVAC-PHI Inc.) measurements of recycled carbon black (PB-365) and the carbon blacks from Production Examples 1 and 3. The C1 bond energy of the XPS spectra was calibrated to a standard value of 285.6 eV. The carbon-carbon bond and the content of each oxygen-containing functional group were then determined using curve fitting. The fitted bond energies for each functional group are as follows: C-C bond, 285.4 eV; C-O bond, 286 eV; C=O bond, 287 eV; and COOH bond, 289.6 eV. The sum of the areas of all peaks after fitting equals 100%.

[0072] Table 3-1 shows that the oxygen-containing functional group content of the carbon blacks of Production Examples 1 and 3 was less than 70%, lower than that of the recycled carbon black (PB-365) before heat treatment. This demonstrates that the organic compound impurity content of the recycled carbon black (Production Example 1) after heat treatment was significantly reduced compared to that of the recycled carbon black (PB-365) before heat treatment. Furthermore, the modified recycled carbon black (Production Example 3) accumulated oxygen-containing functional groups on its surface through an oxidation reaction, demonstrating a higher oxygen-containing functional group content than the recycled carbon black (Production Example 1) that was only heat-treated. However, the oxygen-containing functional group content of the modified recycled carbon black was still lower than that of the recycled carbon black (PB-365) before heat treatment.

[0073] [Table 3-1]

[0074] Figure 1(a) shows the XRD pattern of the recycled carbon black (Production Example 1) after heat treatment, and Figure 1(b) shows the XRD pattern of the recycled carbon black (PB-365) before heat treatment. Figure 1 shows that the heat-treated recycled carbon black has characteristic peaks of crystalline silicon (Si) (sourced from ash in scrap tires) at 2θ positions of 28.38°, 47.26°, 56.08°, 69.08°, and 76.37°, and a broad peak characteristic of amorphous silica (SiO) at 2θ positions of 15-30°. Figure 1 also shows that the content of pure silicon in the recycled carbon black after heat treatment is increased (the characteristic peaks are narrower and more intense) compared to the recycled carbon black before heat treatment.

[0075] Example: Metallic paint production

[0076] The components shown in Table 4 were mixed in the ratios shown. In Example 1, modified recycled carbon black (Production Example 3) was used, and in Comparative Example 1, commercially available virgin carbon black (MA100; NSA110m, manufactured by Mitsubishi Chemical Corporation) was used. 2 The mixture was prepared using a 100 mL / 100 g OAN (Oxidizing Agent) solution containing 1.5 wt. % volatile matter. After mixing, the mixture was uniformly mixed using a high-speed mixer, and the resulting slurry was added to a paint mixer (Radia Red Devil 1400-0H) and pulverized. The fineness of the particles was measured every hour using a fineness meter until the fineness of the particles became less than 10 microns. Next, the viscosity of Example 1 and Comparative Example 1 was adjusted to the same range (i.e., 60±10 seconds for FC#4) by adding a solvent, and metallic paints were obtained.

[0077] [Table 4]

[0078] This metallic paint was coated with a wire on a hiding power test paper (Table 5) and a tin plate (Table 6) and baked at 130°C for 30 minutes. Next, the gloss was measured with a gloss meter (Dr Lange REFO 3), and the blackness and color tone were measured with a colorimeter (X-rite Ci7600). When measuring the blackness and color tone, the SCE was used to remove specular reflection and faithfully represent the color as seen by the human eye. * The test results are shown in Tables 5 and 6, respectively, and the ΔE * ab is as follows:

number

[0079] [Table 5]

[0080] [Table 6]

[0081] From the results in Tables 5 and 6, it can be seen that both the metallic paints of Example 1 and Comparative Example 1 exhibited the same blackness (My) and similar chromaticity (ΔE * ab ), which indicates that the modified carbon black of the present disclosure (Production Example 3) is produced using recycled carbon black as a raw material, but has properties similar to those of commercially available virgin carbon black (Comparative Example 1). Therefore, the modified carbon black produced from recycled carbon black can be used as a direct replacement for commercially available virgin carbon black in coating or ink raw materials with only minimal changes to the raw materials.

[0082] In summary, the present disclosure demonstrates that heat treatment of recycled carbon black can effectively purify the recycled carbon black, resulting in a modified carbon black that can replace commercially available virgin carbon black, thereby improving the applicability and economic value of the recycled carbon black. Because the carbon black of the present disclosure is produced from recycled carbon black, it is also an environmentally friendly carbon black with great application value.

[0083] The above-mentioned are only preferred embodiments of the present disclosure and should not be used to limit the scope of the present disclosure, i.e., any equivalent changes or modifications made simply according to the claims and detailed description of the present disclosure still fall within the scope of the claims of the present disclosure.

[0084] (Addendum) (Appendix 1) Carbon black produced by heat treating recycled carbon black, which satisfies the following conditions: a volatile matter content of less than 3.4% by weight and a polycyclic aromatic hydrocarbon content of about 2 ppm or less.

[0085] (Appendix 2) The volatile matter content is 3.2% by weight or less; 2. The carbon black according to claim 1,

[0086] (Appendix 3) the volatile matter content is greater than about 0% by weight and less than or equal to about 2.9% by weight; 3. The carbon black according to claim 2,

[0087] (Appendix 4) The oil adsorption rate is approximately 150 mL / 100 g or less. 2. The carbon black according to claim 1,

[0088] (Appendix 5) The oil adsorption rate is about 140 mL / 100 g or less. 5. The carbon black according to claim 4,

[0089] (Appendix 6) the oil adsorption rate is between about 100 mL / 100 g and about 135 mL / 100 g; 6. The carbon black according to claim 5,

[0090] (Appendix 7) Nitrogen adsorption specific surface area is approximately 40m 2 / g or more, 2. The carbon black according to claim 1,

[0091] (Appendix 8) The nitrogen adsorption specific surface area is approximately 60m 2 / g or more, 8. The carbon black according to claim 7,

[0092] (Appendix 9) The nitrogen adsorption specific surface area is approximately 65 m 2 / g and approximately 150m 2 / g, 9. The carbon black according to claim 8,

[0093] (Appendix 10) 10. A method for preparing carbon black according to claim 1, comprising: (1) providing recycled carbon black; and (2) heat-treating the recycled carbon black. A preparation method characterized by:

[0094] (Appendix 11) The recycled carbon black is obtained by pyrolysis of tires. 11. The method of claim 10,

[0095] (Appendix 12) The heat treatment is carried out at a temperature of about 800°C or higher. 11. The method of claim 10,

[0096] (Appendix 13) The heat treatment is continued for about 10 minutes or more. 13. The method of claim 12,

[0097] (Appendix 14) (3) further comprising a step of modifying the recycled carbon black after the heat treatment; 11. The method of claim 10,

[0098] (Appendix 15) The modification is carried out using an oxidizing agent. 15. The method of claim 14,

[0099] (Appendix 16) The modification is carried out using ozone. 16. The method of claim 15,

[0100] (Appendix 17) Contains the carbon black described in Appendix 1. 1. A coating or ink comprising:

Claims

1. A carbon black produced by heat treating recycled carbon black, which satisfies the following conditions: a volatile matter content of less than 3.4 wt. % and a polycyclic aromatic hydrocarbon content of about 2 ppm or less.

2. The volatile matter content is 3.2% by weight or less; The carbon black according to claim 1 .

3. the volatile matter content is greater than about 0 wt.% and less than or equal to about 2.9 wt.%; The carbon black according to claim 2 .

4. The oil adsorption rate is about 150 mL / 100 g or less. The carbon black according to claim 1 .

5. The oil adsorption rate is about 140 mL / 100 g or less. The carbon black according to claim 4.

6. The oil adsorption rate is between about 100 mL / 100 g and about 135 mL / 100 g. The carbon black according to claim 5 .

7. Nitrogen adsorption specific surface area is approximately 40m ２ / g or more, The carbon black according to claim 1 .

8. The nitrogen adsorption specific surface area is about 60 m ２ / g or more, The carbon black according to claim 7.

9. The nitrogen adsorption specific surface area is about 65 m ２ / g and about 150m ２ / g, The carbon black according to claim 8.

10. 10. A method for preparing the carbon black of claim 1, comprising: (1) preparing recycled carbon black; and (2) heat-treating the recycled carbon black. A preparation method characterized by:

11. The recycled carbon black is obtained by pyrolysis of tires.

11. The method of claim 10.

12. The heat treatment is carried out at a temperature of about 800°C or higher.

11. The method of claim 10.

13. The heat treatment is continued for about 10 minutes or more.

13. The method of claim 12.

14. (3) further comprising a step of modifying the recycled carbon black after the heat treatment; 11. The method of claim 10.

15. The modification is carried out using an oxidizing agent.

15. The method of claim 14.

16. The modification is carried out using ozone.

16. The method of claim 15.

17. A composition comprising the carbon black according to claim 1.

1. A coating or ink comprising:

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