A modified pyrolysis carbon black and its preparation method

Abstract

This invention discloses a modified pyrolysis carbon black and its preparation method, belonging to the field of pyrolysis carbon black production technology application. It includes pyrolysis carbon slag, a modulus enhancer, an aluminate coupling agent, and a carbon black dispersant; the modulus enhancer includes any one or more combinations of enhancer 9010, enhancer 8180, or HMZ; the aluminate coupling agent includes any one or more combinations of distearate, DL-411, and anti-settling aluminate; the carbon black dispersant includes YY5502 and / or AD8085. This invention is applied to the modification of pyrolysis carbon black, solving the problem that pyrolysis carbon black products obtained by existing pyrolysis technologies cannot be well further applied due to low performance. It can effectively improve the surface activity of pyrolysis carbon black, and the resulting modified pyrolysis carbon black has excellent properties such as tensile stress, tensile strength, and abrasion resistance.

Description

Technical Field

[0001] This invention belongs to the field of pyrolysis carbon black production technology application, and particularly relates to a modified pyrolysis carbon black and its preparation method. Background Technology

[0002] With the rapid development of the automotive industry, a large number of waste tires are generated every year, and the massive accumulation of waste tires has led to a serious "black pollution" problem. How to properly dispose of waste tires has become an important social responsibility issue.

[0003] Currently, countries around the world are committed to the comprehensive utilization of waste tires. The main method for processing waste tires at home and abroad is the thermal pyrolysis method, which involves crushing, removing impurities, and pyrolyzing waste tires at high temperatures to produce products such as pyrolysis carbon black, pyrolysis oil, pyrolysis gas, and steel wire, so as to achieve the complete recycling of waste tires.

[0004] However, traditional pyrolysis technology still suffers from drawbacks such as high energy consumption, high cost, and low performance of pyrolysis carbon black products. Therefore, it is of great significance to explore how to modify pyrolysis carbon black and provide a modified pyrolysis carbon black preparation method that is simple in process, low in cost, and produces carbon black with ideal quality. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the technical problem to be solved by the present invention is to overcome the problem that the pyrolysis carbon black products obtained by the existing pyrolysis technology cannot be well applied due to their low performance. The present invention proposes a modified pyrolysis carbon black that can effectively improve the surface activity of pyrolysis carbon black and has excellent properties such as tensile stress, tensile strength, and wear resistance, as well as its preparation method.

[0006] To solve the aforementioned technical problem, the technical solution adopted by the present invention is as follows:

[0007] This invention provides a modified pyrolysis carbon black, comprising pyrolysis carbon slag, a modulus enhancer, an aluminate coupling agent, and a carbon black dispersant; the modulus enhancer comprises any one or more combinations of enhancer 9010, enhancer 8180, or HMZ; the aluminate coupling agent comprises any one or more combinations of distearyloxyisopropyl aluminate, DL-411, and anti-settling aluminate; and the carbon black dispersant comprises YY5502 and / or AD8085.

[0008] Preferably, it also includes stearic acid and protective wax.

[0009] Preferably, by weight, the pyrolysis carbon slag is 100 parts, the stearic acid is any value of 1-5 parts, the protective wax is any value of 0.2-5 parts, the modulus enhancer is any value of 0.1-8 parts, the aluminate coupling agent is any value of 0.2-3 parts, and the carbon black dispersant is any value of 0.2-6 parts.

[0010] Preferably, by weight, the pyrolysis carbon slag is 100 parts, the stearic acid is 3 parts, the protective wax is 3 parts, the modulus enhancer is 5 parts, the aluminate coupling agent is 2 parts, and the carbon black dispersant is 3 parts.

[0011] The present invention also provides a method for preparing modified pyrolysis carbon black according to any of the above technical solutions, including a grinding and modification treatment step; the grinding and modification treatment step further includes: mixing and stirring the pyrolysis carbon slag with the aluminate coupling agent to obtain mixture A, and then adding the mixture A, modulus enhancer, stearic acid, protective wax and carbon black dispersant into a grinding mill for grinding and modification treatment to obtain the modified pyrolysis carbon black.

[0012] Preferably, the stirring temperature for mixing the pyrolysis carbon slag with the aluminate coupling agent is any value between 90-130°C, and the stirring time is any value between 0.5-1h.

[0013] Preferably, the grinding modification treatment temperature for adding the mixture A, modulus enhancer, stearic acid, protective wax and carbon black dispersant into the grinding mill for grinding modification treatment is any value between 70-110℃.

[0014] Preferably, the process further includes a crushing process, a magnetic separation process, and a pyrolysis and carbonization process prior to the grinding and modification process.

[0015] Preferably, the crushing process includes: the waste tires are first crushed to obtain rubber strips, and the rubber strips are then crushed to obtain rubber blocks; the device used for the first crushing process is a strip crusher, and the device used for the second crushing process is a granular crusher; the particle size of the rubber blocks is ≤35mm.

[0016] Preferably, the pyrolysis and carbonization treatment step includes: conveying the magnetically separated rubber block to the pyrolysis device and performing pyrolysis and carbonization treatment at 350-500°C to obtain the pyrolysis carbon slag.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] This invention provides a modified pyrolysis carbon black. By employing a modulus enhancer, an aluminate coupling agent, and a carbon black dispersant, and further limiting the types of the modulus enhancer, aluminate coupling agent, and carbon black dispersant, the surface activity of the pyrolysis carbon black is effectively improved, and the dispersibility of the pyrolysis carbon black in rubber is enhanced. This results in a modified pyrolysis carbon black product with excellent properties such as tensile stress, tensile strength, and abrasion resistance, thus expanding the application range of modified pyrolysis carbon black in rubber products such as tires and conveyor belts.

[0019] The present invention also provides a method for preparing modified pyrolysis carbon black, which has the advantages of simple preparation process and controllable cost. Detailed Implementation

[0020] The technical solutions in specific embodiments of the present invention will be described in detail and completely below. Obviously, the described embodiments are only some specific implementations of the overall technical solution of the present invention, and not all implementations. Based on the overall concept of the present invention, all other embodiments obtained by those skilled in the art fall within the protection scope of the present invention.

[0021] This invention provides a modified pyrolysis carbon black, comprising pyrolysis carbon slag, a modulus reinforcing agent, an aluminate coupling agent, and a carbon black dispersant; the modulus reinforcing agent comprises any one or more combinations of reinforcing agent 9010, reinforcing agent 8180, or HMZ; the aluminate coupling agent comprises any one or more combinations of distearate, DL-411, and anti-settling aluminate; the carbon black dispersant comprises YY5502 and / or AD8085. This modified pyrolysis carbon black, by employing a modulus reinforcing agent, an aluminate coupling agent, and a carbon black dispersant, and further limiting the types of these agents, effectively improves the surface activity of the pyrolysis carbon black and enhances its dispersibility in rubber, thereby obtaining a modified pyrolysis carbon black product with excellent properties such as tensile stress, tensile strength, and abrasion resistance, thus expanding the application range of modified pyrolysis carbon black in rubber products such as tires and conveyor belts. This modified pyrolysis carbon black utilizes the numerous highly active polysulfide bonds of the hardening and reinforcing agent to organically chelate with rubber. The aluminate coupling agent and the surface of the pyrolysis carbon black particles interact through covalent bonding. The inorganic and organic ends of the coupling agent can chemically react with the surface of the pyrolysis carbon black and the organic resin, respectively, or form entangled structures, enhancing the interfacial compatibility between the pyrolysis carbon black and the organic resin. The carbon black dispersant has a multifunctional structure with highly active anchoring groups. Through the multi-point adsorption of the "anchor" groups, the surface of the pyrolysis carbon black particles is fully activated and modified, destroying and preventing the aggregation of inorganic substances, thereby dispersing them more uniformly into the polymer. This results in a pyrolysis carbon black product with excellent performance, expanding the application range of this novel modified pyrolysis carbon black in rubber products such as tires and conveyor belts.

[0022] In a preferred embodiment, stearic acid and a protective wax are also included.

[0023] In a preferred embodiment, by weight, the pyrolysis carbon slag is 100 parts, the stearic acid is any value of 1-5 parts, the protective wax is any value of 0.2-5 parts, the modulus enhancer is any value of 0.1-8 parts, the aluminate coupling agent is any value of 0.2-3 parts, and the carbon black dispersant is any value of 0.2-6 parts. Further, by weight, the pyrolysis carbon slag is 100 parts, the stearic acid is 3 parts, the protective wax is 3 parts, the modulus enhancer is 5 parts, the aluminate coupling agent is 2 parts, and the carbon black dispersant is 3 parts.

[0024] This invention also provides a method for preparing modified pyrolysis carbon black according to any of the above technical solutions, including a grinding and modification step; the grinding and modification step further includes: mixing and stirring the pyrolysis carbon slag with the aluminate coupling agent to obtain mixture A, and then adding mixture A, modulus enhancer, stearic acid, protective wax and carbon black dispersant to a grinding mill for grinding and modification treatment to obtain the modified pyrolysis carbon black. Specifically, the pyrolysis carbon slag is first mixed and stirred with the coupling agent in a mixing tank, which is beneficial for the inorganic and organic ends of the coupling agent to react chemically with the surface of the pyrolysis carbon black and the organic resin respectively, or to form an entangled structure. The reason for specifically limiting the mixing and stirring of the pyrolysis carbon slag and the aluminate coupling agent in the grinding and modification step is that the siloxane groups in the pyrolysis carbon black and the aluminate coupling agent need to react under certain temperature conditions and time to modify the pyrolysis carbon black. In a preferred embodiment, the stirring temperature for mixing the pyrolysis slag and the aluminate coupling agent is any value between 90-130°C, and the stirring time is any value between 0.5-1h. It is understood that the stirring temperature can also be any value within the range of 100°C, 110°C, 120°C, and the stirring time can also be any value within the range of 0.6h, 0.7h, 0.8h, 0.9h, and so on.

[0025] The above preparation method can solve the technical problems of high energy consumption, high cost, and low performance of pyrolysis carbon black products in existing technologies. It has the characteristics of simple preparation process, controllable cost, and excellent carbon black performance, realizing the recycling of waste tire resources. The modified pyrolysis carbon black prepared by this method has a grinding particle size controlled between 10 and 18 μm, and this particle size distribution is obtained by measuring the D90 particle size value using a laser particle size analyzer.

[0026] In a preferred embodiment, the grinding modification treatment temperature for adding the mixture A, modulus enhancer, stearic acid, protective wax, and carbon black dispersant to a grinding mill for grinding modification is any value between 70-110°C. It is understood that the grinding modification treatment temperature can also be any value within the range of 80°C, 90°C, 100°C, or 100°C.

[0027] In a preferred embodiment, the process further includes a crushing step, a magnetic separation step, and a pyrolysis and carbonization step, preceding the grinding and modification step. The magnetic separation step removes the steel wire from the rubber block, resulting in a magnetically separated rubber block.

[0028] In a preferred embodiment, the crushing process includes: waste tires undergoing a first-stage crushing process to obtain rubber strips, which are then subjected to a second-stage crushing process to obtain rubber blocks; the first-stage crushing process uses a strip crusher, and the second-stage crushing process uses a granular crusher; the particle size of the rubber blocks is ≤35mm. Processing waste tires into rubber blocks of this particle size allows them to fully react in subsequent pyrolysis and carbonization processes, thereby further improving the surface activity of the modified pyrolysis carbon black.

[0029] In a preferred embodiment, the pyrolysis carbonization step includes: conveying the magnetically separated rubber block to a pyrolysis device and performing pyrolysis carbonization treatment at 350-500°C to obtain the pyrolysis carbon slag. It is understood that the pyrolysis carbonization temperature can also be any value within 400°C, 450°C, or a range thereof.

[0030] To provide a clearer and more detailed description of the modified pyrolysis carbon black and its preparation method provided in the embodiments of the present invention, the following description will be based on specific embodiments.

[0031] Example 1

[0032] This embodiment provides a method for preparing modified pyrolysis carbon black, the details of which are as follows:

[0033] The modified pyrolysis carbon black formulation contains the following raw materials in parts by weight:

[0034] The mixture contains 100 parts of pyrolysis carbon slag, 5 parts of stearic acid, 5 parts of protective wax, 8 parts of modulus enhancer, 3 parts of aluminate coupling agent, and 6 parts of carbon black super dispersant. The modulus enhancer is enhancer 9010, the aluminate coupling agent is distearyloxyisopropyl aluminate, and the carbon black super dispersant is YY5502.

[0035] The preparation method of modified pyrolysis carbon black includes the following steps:

[0036] (1) Crushing process: Waste tires are first crushed by a strip crusher to obtain rubber strips, and then crushed by a granular crusher to obtain rubber blocks. The rubber blocks have a particle size of ≤35mm.

[0037] (2) Magnetic separation: The rubber block obtained in step (1) is subjected to magnetic separation to remove the steel wire in the rubber block, and the rubber block after magnetic separation is obtained.

[0038] (3) Pyrolysis and carbonization treatment: The gel block obtained in step (2) after magnetic separation is transferred to the pyrolysis kettle and subjected to pyrolysis and carbonization treatment at 350°C to obtain pyrolysis carbon slag;

[0039] (4) Grinding and modification treatment: According to the weight ratio, the pyrolysis carbon slag and aluminate coupling agent are first added to the mixing tank and mixed and stirred at 130°C for 0.5h to obtain mixture A. Then, mixture A, modulus enhancer, stearic acid, protective wax and carbon black super dispersant are added to the grinding mill and ground and modified at 110°C to obtain the new modified pyrolysis carbon black.

[0040] Example 2

[0041] This embodiment provides a method for preparing modified pyrolysis carbon black, the details of which are as follows:

[0042] The modified pyrolysis carbon black formulation contains the following raw materials in parts by weight:

[0043] The mixture contains 100 parts of pyrolysis carbon slag, 1 part of stearic acid, 0.2 parts of protective wax, 0.1 parts of modulus enhancer, 0.2 parts of aluminate coupling agent, and 0.2 parts of carbon black super dispersant. The modulus enhancer is enhancer 8180, the aluminate coupling agent is DL-411, and the carbon black super dispersant is AD8085.

[0044] The preparation method of modified pyrolysis carbon black includes the following steps:

[0045] (1) Crushing process: Waste tires are first crushed by a strip crusher to obtain rubber strips, and then crushed by a granular crusher to obtain rubber blocks. The rubber blocks have a particle size of ≤35mm.

[0046] (2) Magnetic separation: The rubber block obtained in step (1) is subjected to magnetic separation to remove the steel wire in the rubber block, and the rubber block after magnetic separation is obtained.

[0047] (3) Pyrolysis and carbonization treatment: The gel block obtained in step (2) after magnetic separation is transferred to the pyrolysis kettle and subjected to pyrolysis and carbonization treatment at 500°C to obtain pyrolysis carbon slag;

[0048] (4) Grinding and modification treatment: According to the weight ratio, the pyrolysis carbon slag and aluminate coupling agent are first added to the mixing tank and mixed and stirred at 90°C for 1 hour to obtain mixture A. Then, mixture A, modulus enhancer, stearic acid, protective wax and carbon black super dispersant are added to the grinding mill and ground and modified at 70°C to obtain the new modified pyrolysis carbon black.

[0049] Example 3

[0050] This embodiment provides a method for preparing modified pyrolysis carbon black, the details of which are as follows:

[0051] The modified pyrolysis carbon black formulation contains the following raw materials in parts by weight:

[0052] The composition includes 100 parts of pyrolysis carbon slag, 3 parts of stearic acid, 3 parts of protective wax, 4 parts of modulus enhancer, 1.5 parts of aluminate coupling agent, and 3 parts of carbon black super dispersant. The modulus enhancer is HMZ, the aluminate coupling agent is an anti-settling aluminate, and the carbon black super dispersant is YY5502 and AD8085.

[0053] The preparation method of modified pyrolysis carbon black includes the following steps:

[0054] (1) Crushing process: Waste tires are first crushed by a strip crusher to obtain rubber strips, and then crushed by a granular crusher to obtain rubber blocks. The rubber blocks have a particle size of ≤35mm.

[0055] (2) Magnetic separation: The rubber block obtained in step (1) is subjected to magnetic separation to remove the steel wire in the rubber block, and the rubber block after magnetic separation is obtained.

[0056] (3) Pyrolysis and carbonization treatment: The gel block obtained in step (2) after magnetic separation is transferred to the pyrolysis kettle and subjected to pyrolysis and carbonization treatment at 420°C to obtain pyrolysis carbon slag;

[0057] (4) Grinding and modification treatment: According to the weight ratio, the pyrolysis carbon slag and aluminate coupling agent are first added to the mixing tank and mixed and stirred at 110°C for 0.5h to obtain mixture A. Then, mixture A, modulus enhancer, stearic acid, protective wax and carbon black super dispersant are added to the grinding mill and ground and modified at 90°C to obtain the new modified pyrolysis carbon black.

[0058] Example 4

[0059] This embodiment provides a method for preparing modified pyrolysis carbon black, the details of which are as follows:

[0060] The modified pyrolysis carbon black formulation contains the following raw materials in parts by weight:

[0061] The composition includes 100 parts of pyrolysis carbon slag, 2 parts of stearic acid, 2 parts of protective wax, 2 parts of modulus enhancer, 0.8 parts of aluminate coupling agent, and 2 parts of carbon black super dispersant. The modulus enhancer consists of enhancer 9010 and HMZ, the aluminate coupling agent consists of distearyloxyisopropyl aluminate and anti-settling aluminate, and the carbon black super dispersant consists of YY5502 and AD8085.

[0062] The preparation method of modified pyrolysis carbon black includes the following steps:

[0063] (1) Crushing process: Waste tires are first crushed by a strip crusher to obtain rubber strips, and then crushed by a granular crusher to obtain rubber blocks. The rubber blocks have a particle size of ≤35mm.

[0064] (2) Magnetic separation: The rubber block obtained in step (1) is subjected to magnetic separation to remove the steel wire in the rubber block, and the rubber block after magnetic separation is obtained.

[0065] (3) Pyrolysis and carbonization treatment: The gel block obtained in step (2) after magnetic separation is transferred to the pyrolysis kettle and subjected to pyrolysis and carbonization treatment at 390°C to obtain pyrolysis carbon slag;

[0066] (4) Grinding and modification treatment: According to the weight ratio, the pyrolysis carbon slag and aluminate coupling agent are first added to the mixing tank and mixed and stirred at 100°C for 1 hour to obtain mixture A. Then, mixture A, modulus enhancer, stearic acid, protective wax and carbon black super dispersant are added to the grinding mill and ground and modified at 80°C to obtain the new modified pyrolysis carbon black.

[0067] Example 5

[0068] This embodiment provides a method for preparing modified pyrolysis carbon black, the details of which are as follows:

[0069] The modified pyrolysis carbon black formulation contains the following raw materials in parts by weight:

[0070] The composition includes 100 parts of pyrolysis carbon slag, 4 parts of stearic acid, 4 parts of protective wax, 6 parts of modulus enhancer, 2 parts of aluminate coupling agent, and 4.5 parts of carbon black super dispersant. The modulus enhancers are enhancer 9010 and enhancer 8180, the aluminate coupling agents are distearyloxyisopropyl aluminate and DL-411, and the carbon black super dispersant is YY5502.

[0071] The preparation method of modified pyrolysis carbon black includes the following steps:

[0072] (1) Crushing process: Waste tires are first crushed by a strip crusher to obtain rubber strips, and then crushed by a granular crusher to obtain rubber blocks. The rubber blocks have a particle size of ≤35mm.

[0073] (2) Magnetic separation: The rubber block obtained in step (1) is subjected to magnetic separation to remove the steel wire in the rubber block, and the rubber block after magnetic separation is obtained.

[0074] (3) Pyrolysis and carbonization treatment: The gel block obtained in step (2) after magnetic separation is transferred to the pyrolysis kettle and subjected to pyrolysis and carbonization treatment at 460°C to obtain pyrolysis carbon slag;

[0075] (4) Grinding and modification treatment: According to the weight ratio, the pyrolysis carbon slag and aluminate coupling agent are first added to the mixing tank and mixed and stirred at 120°C for 0.5h to obtain mixture A. Then, mixture A, modulus enhancer, stearic acid, protective wax and carbon black super dispersant are added to the grinding mill and ground and modified at 120°C to obtain the new modified pyrolysis carbon black.

[0076] Comparative Example 1

[0077] This embodiment provides a method for preparing pyrolysis carbon black, the details of which are as follows:

[0078] The modified pyrolysis carbon black formulation contains the following raw materials in parts by weight:

[0079] The composition includes 100 parts of pyrolysis carbon slag, 3 parts of stearic acid, 3 parts of protective wax, 4 parts of modulus enhancer, and 3 parts of carbon black super dispersant. The modulus enhancer is enhancer 9010, and the carbon black super dispersant is YY5502.

[0080] The preparation method of modified pyrolysis carbon black includes the following steps:

[0081] (1) Crushing process: Waste tires are first crushed by a strip crusher to obtain rubber strips, and then crushed by a granular crusher to obtain rubber blocks. The rubber blocks have a particle size of ≤35mm.

[0082] (2) Magnetic separation: The rubber block obtained in step (1) is subjected to magnetic separation to remove the steel wire in the rubber block, and the rubber block after magnetic separation is obtained.

[0083] (3) Pyrolysis and carbonization treatment: The gel block obtained in step (2) after magnetic separation is transferred to the pyrolysis kettle and subjected to pyrolysis and carbonization treatment at 420°C to obtain pyrolysis carbon slag;

[0084] (4) Grinding and modification treatment: According to the weight ratio, the modulus enhancer, stearic acid, protective wax and carbon black super dispersant are added to the grinding mill for grinding and modification treatment to obtain the modified pyrolysis carbon black.

[0085] Comparative Example 2

[0086] This embodiment provides a method for preparing modified pyrolysis carbon black, the details of which are as follows:

[0087] The modified pyrolysis carbon black formulation contains the following raw materials in parts by weight:

[0088] The mixture contains 100 parts of pyrolysis carbon slag, 3 parts of stearic acid, 3 parts of protective wax, 1.5 parts of aluminate coupling agent, and 3 parts of carbon black super dispersant. The aluminate coupling agent is distearyloxyisopropyl aluminate, and the carbon black super dispersant is YY5502.

[0089] The preparation method of modified pyrolysis carbon black includes the following steps:

[0090] (1) Crushing process: Waste tires are first crushed by a strip crusher to obtain rubber strips, and then crushed by a granular crusher to obtain rubber blocks. The rubber blocks have a particle size of ≤35mm.

[0091] (2) Magnetic separation: The rubber block obtained in step (1) is subjected to magnetic separation to remove the steel wire in the rubber block, and the rubber block after magnetic separation is obtained.

[0092] (3) Pyrolysis and carbonization treatment: The gel block obtained in step (2) after magnetic separation is transferred to the pyrolysis kettle and subjected to pyrolysis and carbonization treatment at 420°C to obtain pyrolysis carbon slag;

[0093] (4) Grinding and modification treatment: According to the weight ratio, aluminate coupling agent, stearic acid, protective wax and carbon black super dispersant are added to a grinding mill for grinding and modification treatment to obtain the modified pyrolysis carbon black.

[0094] Comparative Example 3

[0095] This embodiment provides a method for preparing modified pyrolysis carbon black, the details of which are as follows:

[0096] The modified pyrolysis carbon black formulation contains the following raw materials in parts by weight:

[0097] The composition includes 100 parts of pyrolysis carbon slag, 3 parts of stearic acid, 3 parts of protective wax, 4 parts of modulus enhancer, and 1.5 parts of aluminate coupling agent. The modulus enhancer is enhancer 9010, and the aluminate coupling agent is distearyloxyisopropyl aluminate.

[0098] The preparation method of modified pyrolysis carbon black includes the following steps:

[0099] (1) Crushing process: Waste tires are first crushed by a strip crusher to obtain rubber strips, and then crushed by a granular crusher to obtain rubber blocks. The rubber blocks have a particle size of ≤35mm.

[0100] (2) Magnetic separation: The rubber block obtained in step (1) is subjected to magnetic separation to remove the steel wire in the rubber block, and the rubber block after magnetic separation is obtained.

[0101] (3) Pyrolysis and carbonization treatment: The gel block obtained in step (2) after magnetic separation is transferred to the pyrolysis kettle and subjected to pyrolysis and carbonization treatment at 420°C to obtain pyrolysis carbon slag;

[0102] (4) Grinding and modification treatment: According to the weight ratio, the modulus enhancer, aluminate coupling agent, stearic acid and protective wax are added to the grinding mill for grinding and modification treatment to obtain the modified pyrolysis carbon black.

[0103] Comparative Example 4

[0104] This embodiment provides a method for preparing modified pyrolysis carbon black, the details of which are as follows:

[0105] The modified pyrolysis carbon black formulation contains the following raw materials in parts by weight:

[0106] The composition includes 100 parts of pyrolysis carbon slag, 3 parts of stearic acid, 3 parts of protective wax, 4 parts of modulus enhancer, 1.5 parts of aluminate coupling agent, and 3 parts of carbon black super dispersant. The modulus enhancer is RT-2401, the aluminate coupling agent is an anti-settling aluminate, and the carbon black super dispersant is YY5502 and AD8085.

[0107] The preparation method of modified pyrolysis carbon black includes the following steps:

[0108] (1) Crushing process: Waste tires are first crushed by a strip crusher to obtain rubber strips, and then crushed by a granular crusher to obtain rubber blocks. The rubber blocks have a particle size of ≤35mm.

[0109] (2) Magnetic separation: The rubber block obtained in step (1) is subjected to magnetic separation to remove the steel wire in the rubber block, and the rubber block after magnetic separation is obtained.

[0110] (3) Pyrolysis and carbonization treatment: The gel block obtained in step (2) after magnetic separation is transferred to the pyrolysis kettle and subjected to pyrolysis and carbonization treatment at 420°C to obtain pyrolysis carbon slag;

[0111] (4) Grinding and modification treatment: According to the weight ratio, the pyrolysis carbon slag and aluminate coupling agent are first added to the mixing tank and mixed and stirred at 110°C for 0.5h to obtain mixture A. Then, mixture A, modulus enhancer, stearic acid, protective wax and carbon black super dispersant are added to the grinding mill and ground and modified at 90°C to obtain the new modified pyrolysis carbon black.

[0112] Comparative Example 5

[0113] This embodiment provides a method for preparing modified pyrolysis carbon black, the details of which are as follows:

[0114] The modified pyrolysis carbon black formulation contains the following raw materials in parts by weight:

[0115] The composition includes 100 parts of pyrolysis carbon slag, 3 parts of stearic acid, 3 parts of protective wax, 4 parts of modulus enhancer, 1.5 parts of aluminate coupling agent, and 3 parts of carbon black super dispersant. The modulus enhancer is HMZ, the aluminate coupling agent is DL-331, and the carbon black super dispersant is YY5502 and AD8085.

[0116] The preparation method of modified pyrolysis carbon black includes the following steps:

[0117] (1) Crushing process: Waste tires are first crushed by a strip crusher to obtain rubber strips, and then crushed by a granular crusher to obtain rubber blocks. The rubber blocks have a particle size of ≤35mm.

[0118] (2) Magnetic separation: The rubber block obtained in step (1) is subjected to magnetic separation to remove the steel wire in the rubber block, and the rubber block after magnetic separation is obtained.

[0119] (3) Pyrolysis and carbonization treatment: The gel block obtained in step (2) after magnetic separation is transferred to the pyrolysis kettle and subjected to pyrolysis and carbonization treatment at 420°C to obtain pyrolysis carbon slag;

[0120] (4) Grinding and modification treatment: According to the weight ratio, the pyrolysis carbon slag and aluminate coupling agent are first added to the mixing tank and mixed and stirred at 110°C for 0.5h to obtain mixture A. Then, mixture A, modulus enhancer, stearic acid, protective wax and carbon black super dispersant are added to the grinding mill and ground and modified at 90°C to obtain the new modified pyrolysis carbon black.

[0121] Comparative Example 6

[0122] This embodiment provides a method for preparing modified pyrolysis carbon black, the details of which are as follows:

[0123] The modified pyrolysis carbon black formulation contains the following raw materials in parts by weight:

[0124] The composition includes 100 parts of pyrolysis carbon slag, 3 parts of stearic acid, 3 parts of protective wax, 4 parts of modulus enhancer, 1.5 parts of aluminate coupling agent, and 3 parts of carbon black super dispersant. The modulus enhancer is HMZ, the aluminate coupling agent is an anti-settling aluminate, and the carbon black super dispersant is FNS-78T.

[0125] The preparation method of modified pyrolysis carbon black includes the following steps:

[0126] (1) Crushing process: Waste tires are first crushed by a strip crusher to obtain rubber strips, and then crushed by a granular crusher to obtain rubber blocks. The rubber blocks have a particle size of ≤35mm.

[0127] (2) Magnetic separation: The rubber block obtained in step (1) is subjected to magnetic separation to remove the steel wire in the rubber block, and the rubber block after magnetic separation is obtained.

[0128] (3) Pyrolysis and carbonization treatment: The gel block obtained in step (2) after magnetic separation is transferred to the pyrolysis kettle and subjected to pyrolysis and carbonization treatment at 420°C to obtain pyrolysis carbon slag;

[0129] (4) Grinding and modification treatment: According to the weight ratio, the pyrolysis carbon slag and aluminate coupling agent are first added to the mixing tank and mixed and stirred at 110°C for 0.5h to obtain mixture A. Then, mixture A, modulus enhancer, stearic acid, protective wax and carbon black super dispersant are added to the grinding mill and ground and modified at 90°C to obtain the new modified pyrolysis carbon black.

[0130] Performance testing

[0131] Rubber was prepared using the modified pyrolysis carbon black filler obtained in Examples 1-5 and Comparative Examples 1-6, and untreated waste tire pyrolysis carbon residue. The composition, by weight, consisted of 50 parts SMR20 natural rubber, 50 parts SBR1502, 3 parts stearic acid, 5 parts zinc oxide, 1.2 parts accelerator NS, 2.0 parts sulfur, 7.0 parts aromatic oil, 20 parts N220, and 50 parts modified pyrolysis carbon black filler. The properties of the prepared rubber (using untreated waste tire pyrolysis carbon residue) were tested according to national standard methods. The test results are shown in Table 1.

[0132] Table 1. Performance of the rubber compounds in the examples and comparative examples.

[0133]

[0134] Table 1 shows that the performance test data indicates that the novel modified pyrolysis carbon black prepared by this invention has good dispersibility and higher tensile strength, tensile stress, hardness, tear strength, and abrasion resistance, and has broad application prospects. Through five examples and six comparative examples, Example 3 shows the best performance. Therefore, Example 3 is the best example. Variables within the range are also within the scope of protection of this solution.

[0135] In summary, this invention proposes a novel modified pyrolysis carbon black and its preparation method. By modifying the pyrolysis carbon black, the hardening and reinforcing agent utilizes its numerous highly active polysulfide bonds to organically chelate with rubber. The aluminate coupling agent and the surface of the pyrolysis carbon black particles interact through covalent bonding. The inorganic and organic ends of the coupling agent can chemically react with the surface of the pyrolysis carbon black and the organic resin, respectively, or form entangled structures, enhancing the interfacial compatibility between the pyrolysis carbon black and the organic resin. The carbon black super-dispersant possesses a multifunctional structure with highly active anchoring groups. Through multi-point adsorption of the "anchor" groups, the surface of the pyrolysis carbon black particles is fully activated and modified, disrupting and preventing the aggregation of inorganic substances, thus achieving more uniform dispersion in the polymer. This results in a pyrolysis carbon black product with excellent performance characteristics, expanding the application range of this novel modified pyrolysis carbon black in rubber products such as tires and conveyor belts. This invention features a simple preparation process, controllable cost, and excellent carbon black performance.

Claims

1. A modified pyrolysis carbon black, characterized in that, The mixture includes pyrolysis carbon slag, a modulus enhancer, an aluminate coupling agent, and a carbon black dispersant; the modulus enhancer is HMZ; the aluminate coupling agent is an anti-settling aluminate; the carbon black dispersant includes YY5502 and AD8085; it also includes stearic acid and a protective wax; by weight, the pyrolysis carbon slag is 100 parts, the stearic acid is any value of 1-5 parts, the protective wax is any value of 0.2-5 parts, the modulus enhancer is any value of 0.1-8 parts, the aluminate coupling agent is any value of 0.2-3 parts, and the carbon black dispersant is any value of 0.2-6 parts.

2. The modified pyrolysis carbon black according to claim 1, characterized in that, By weight, the pyrolysis carbon slag is 100 parts, the stearic acid is 3 parts, the protective wax is 3 parts, the modulus enhancer is 5 parts, the aluminate coupling agent is 2 parts, and the carbon black dispersant is 3 parts.

3. The method for preparing modified pyrolysis carbon black according to any one of claims 1-2, characterized in that, Includes grinding and modification steps; The grinding and modification process further includes: mixing and stirring the pyrolysis carbon slag with the aluminate coupling agent to obtain mixture A, and then adding mixture A, modulus enhancer, stearic acid, protective wax and carbon black dispersant into a grinding mill for grinding and modification to obtain the modified pyrolysis carbon black.

4. The method for preparing modified pyrolysis carbon black according to claim 3, characterized in that, The stirring temperature for mixing the pyrolysis carbon slag with the aluminate coupling agent is any value between 90-130℃, and the stirring time is any value between 0.5-1 h.

5. The method for preparing modified pyrolysis carbon black according to claim 3, characterized in that, The grinding modification process, in which the mixture A, modulus enhancer, stearic acid, protective wax, and carbon black dispersant are added to a grinding mill for grinding modification, takes place at any temperature between 70 and 110°C.

6. The method for preparing modified pyrolysis carbon black according to claim 3, characterized in that, It also includes a crushing process, a magnetic separation process, and a pyrolysis and carbonization process preceding the grinding and modification process.

7. The method for preparing modified pyrolysis carbon black according to claim 6, characterized in that, The crushing process includes: waste tires are first crushed to obtain rubber strips, and the rubber strips are then crushed in a second stage to obtain rubber blocks; the device used for the first stage crushing is a strip crusher, and the device used for the second stage crushing is a granular crusher; the particle size of the rubber blocks is ≤35 mm.

8. The method for preparing modified pyrolysis carbon black according to claim 6, characterized in that, The pyrolysis and carbonization process includes: conveying the magnetically separated rubber block to the pyrolysis device and performing pyrolysis and carbonization treatment at 350-500℃ to obtain the pyrolysis carbon slag.

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