Regenerated carbon black reinforcing agent and preparation method thereof

Abstract

The invention relates to the technical field of carbon black preparation, and particularly discloses a regenerated carbon black reinforcing agent and a preparation method thereof, the regenerated carbon black reinforcing agent comprises the following raw materials by weight: 10-50 parts of a vulcanization accelerator, 2.5-12 parts of stearic acid, 2-10 parts of tackifying resin, 0.5-3 parts of modified nano zinc oxide, 0.2-2 parts of calcium sulfate whisker, 0.2-2 parts of white carbon black, 4-18 parts of carbon black and 1-5 parts of a modified silane coupling agent. The regenerated carbon black reinforcing agent provided by the invention is a high-performance modifier, when the regenerated carbon black reinforcing agent is used for modification treatment of the cracked carbon residues, the reinforcing performance of the cracked carbon residues can be efficiently improved, the 300% tensile strength and the tensile strength can meet the standards of reinforcing agents, and the regenerated carbon black reinforcing agent can replace part of commercial carbon black to be used as a reinforcing agent and has a relatively high application prospect.

Description

Technical Field

[0001] The invention belongs to the technical field of carbon black preparation, and particularly relates to a regenerated carbon black reinforcing agent and a preparation method thereof. Background Art

[0002] The main materials used in tire manufacturing include natural rubber and synthetic rubber. The development of the industry is closely related to the automobile industry. With the rapid development of the automobile industry, more and more waste rubber tires have become a large category of solid waste. Therefore, the treatment, disposal and recycling of waste rubber products are particularly important. Based on the current situation of shortage of rubber resources in my country, the recycling methods of waste rubber tires have become a hot topic, mainly including direct utilization, tire retreading, production of recycled rubber and recycled rubber powder, thermal cracking, incineration and heating, etc.

[0003] Among them, thermal cracking is a more effective method for recycling waste rubber products. The waste rubber products are placed in an inert gas atmosphere and heated. The heating temperature is usually between 300 and 900 ° C. The long-chain macromolecular organic matter is destroyed into small molecular substances such as fuel oil, combustible gas and cracked carbon slag. The carbon slag produced by thermal cracking is regenerated carbon black. The regenerated carbon black obtained by its recycling can realize the resource utilization of solid waste, which is of great significance.

[0004] However, the performance of the pyrolysis carbon slag commonly used in the current recycled carbon black industry is poor, and the 300% elongation and tensile strength cannot meet the requirements for its use as an additive for rubber tires or other rubber products, especially its reinforcing performance for rubber is reduced. Xiao Guoliang et al. used an ultrafine airflow classifier to grind the recycled carbon black. After grinding, the particle size of the recycled carbon black was significantly reduced, the aggregates were more compact, the specific surface area and physical adsorption capacity were improved, and when it was used as a rubber reinforcing agent, it was beneficial to improve the performance of rubber composite materials. However, the carbon black particles that were ground were prone to adhesion and agglomeration, and the reinforcement effect was reduced; Zhou et al. acidified and titanate-modified the recycled carbon black. This modification enhanced the bonding force between the recycled carbon black and rubber. When it was used as a rubber reinforcing agent, it could effectively improve the main mechanical properties of the matrix. However, there was still room for improvement in the 300% elongation and tensile strength.

[0005] In view of this, it is particularly important to disclose a regenerated carbon black reinforcing agent in this application. Summary of the invention

[0006] In view of the defects of the prior art, the purpose of the present invention is to provide a regenerated carbon black reinforcing agent and a preparation method thereof. The regenerated carbon black reinforcing agent provided by the present invention is a high-performance modifier. When it is used for cracking carbon slag modification treatment, it can effectively improve the reinforcing performance of cracking carbon slag. The 300% tensile strength and tensile strength can meet the reinforcing agent standards. It can replace part of commercial carbon black as a reinforcing agent and has a broad application prospect.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] On the one hand, the present invention provides a regenerated carbon black reinforcing agent, which comprises the following raw materials in parts by weight: 10 to 50 parts of a vulcanization accelerator, 2.5 to 12 parts of stearic acid, 2 to 10 parts of a tackifying resin, 0.5 to 3 parts of modified nano zinc oxide, 0.2 to 2 parts of calcium sulfate whiskers, 0.2 to 2 parts of white carbon black, 4 to 18 parts of carbon black and 1 to 5 parts of a modified silane coupling agent.

[0009] In some embodiments of the present invention, the vulcanization accelerator is hexamethylenetetramine.

[0010] The applicant preferably adds hexamethylenetetramine rich in active amines as a vulcanization accelerator. When it is added to the system, some active amines are preferentially adsorbed on the surface of silica and carbon black in the system, effectively weakening the adsorption of silica and carbon black on other components of the system, avoiding the delayed vulcanization phenomenon, and ensuring the performance of the regenerated carbon black reinforcing agent.

[0011] In some embodiments of the present invention, the preparation steps of the modified nano zinc oxide are as follows:

[0012] Polyethylene glycol, zinc nitrate solution and sodium carboxymethyl cellulose are added to the reactor in sequence, and then triethanolamine aqueous solution and anhydrous ethanol are added after stirring evenly. After stirring for 1 to 2 hours, the mixture is transferred to another reactor, heated to 180 to 185° C. and reacted for 10 to 30 minutes. The mixture is cooled to room temperature, centrifuged, washed, dried to constant weight, and ground to obtain modified nano zinc oxide with a particle size distribution range of 100 to 500 nm.

[0013] Preferably, the mass fraction of the zinc nitrate solution is 30-50wt%, and the solvent is deionized water.

[0014] Further preferably, the mass fraction of the zinc nitrate solution is 40wt%.

[0015] Preferably, the mass fraction of the triethanolamine aqueous solution is 10-30wt%.

[0016] Further preferably, the mass fraction of the triethanolamine aqueous solution is 20 wt %.

[0017] Preferably, the molar ratio of zinc nitrate in the zinc nitrate solution to triethanolamine in the triethanolamine aqueous solution is 0.01:(1.1-1.3).

[0018] Further preferably, the molar ratio of zinc nitrate in the zinc nitrate solution to triethanolamine in the triethanolamine aqueous solution is 0.01:1.2.

[0019] Preferably, the amount of anhydrous ethanol added is 5 to 10 times the mass of the triethanolamine aqueous solution.

[0020] Further preferably, the added amount of anhydrous ethanol is 7.5 times the mass of the triethanolamine aqueous solution.

[0021] In some embodiments of the present invention, the modifying agent is sodium carboxymethyl cellulose.

[0022] In some embodiments of the present invention, the amount of the modifier added is 0.01 to 0.1% of the mass of zinc nitrate in the zinc nitrate solution.

[0023] Preferably, the amount of the modifier added is 0.05% of the mass of zinc nitrate in the zinc nitrate solution.

[0024] Preferably, the amount of polyethylene glycol added is 0.5-1% of the mass of zinc nitrate in the zinc nitrate solution.

[0025] Further preferably, the amount of polyethylene glycol added is 0.8% of the mass of zinc nitrate in the zinc nitrate solution.

[0026] Preferably, the model of the polyethylene glycol is PEG4000.

[0027] In the field of rubber products, zinc oxide is an important auxiliary agent that affects the type, quantity and formation speed of chemical cross-linking bonds in the vulcanization process, thereby playing an activation role and accelerating the vulcanization process. Different from the commonly used technology in the prior art of directly adding a modifier to blend and graft modify nano zinc oxide, the present invention uses zinc nitrate and triethanolamine aqueous solution as raw materials for synthesizing nano zinc oxide, introduces sodium carboxymethyl cellulose in situ for graft modification, and adds the nano zinc oxide modified by sodium carboxymethyl cellulose to the regenerated carbon black reinforcing agent system as a vulcanization activator. It can effectively and quickly play an activation role. The possible reason is that the nano zinc oxide modified by in situ grafting of sodium carboxymethyl cellulose can be evenly distributed in the system. The exposed active sites are increased, the activation stability is enhanced, the carboxyl and hydroxyl functional groups introduced on the surface form coordination bonds with divalent zinc ions, forming steric hindrance, which not only reduces the collision and agglomeration of nano zinc oxide particles, but also ensures the particle size and crystal stability of nano zinc oxide; on the other hand, the ash of cracked carbon slag contains more zinc oxide. When the regenerated carbon black reinforcing agent containing modified nano zinc oxide is added to the cracked carbon slag, it can achieve uniform dispersion between zinc oxide particles, play a more efficient activation role, and reduce the impact on the structure of the regenerated carbon black of the cracked carbon slag; on the other hand, sodium carboxymethyl cellulose can also play a certain thickening role, which reduces the cost of adding tackifying resin to a certain extent.

[0028] In some embodiments of the present invention, the preparation steps of the modified silane coupling agent are as follows:

[0029] Add tetrahydrofuran into the reactor, add triethoxysilane modified liquid polybutadiene and mercaptosilane coupling agent in sequence, stir evenly, heat to 60-70°C, keep stirring at constant temperature, react for 1-2h, cool to room temperature after the reaction, remove tetrahydrofuran with a rotary evaporator, and then wash with anhydrous ethanol for 1-5 times to obtain the modified silane coupling agent.

[0030] In some embodiments of the present invention, the mercaptosilane coupling agent is bis-(γ-triethoxysilylpropyl) tetrasulfide.

[0031] In some embodiments of the present invention, the mass ratio of the triethoxysilane-modified liquid polybutadiene to the mercaptosilane coupling agent is 2:(0.2-0.5).

[0032] Preferably, the mass ratio of the triethoxysilane-modified liquid polybutadiene to the mercaptosilane coupling agent is 2:0.35.

[0033] Preferably, the added amount of tetrahydrofuran is 2 to 3 times the total mass of the triethoxysilane-modified liquid polybutadiene and the mercaptosilane coupling agent.

[0034] Further preferably, the added amount of tetrahydrofuran is 2.5 times the total mass of the triethoxysilane-modified liquid polybutadiene and the mercaptosilane coupling agent.

[0035] In the prior art, due to the influence of surface polarity and hydrophilicity, carbon black has poor compatibility with rubber base materials, and its performance as a reinforcing agent is poor. It is often used in combination with a coupling agent to increase compatibility and exert a high-quality reinforcing effect. When carbon black regenerated from cracked carbon slag is used as a reinforcing agent, its aggregates adhere to each other and cannot be effectively dispersed, resulting in generally larger carbon black particles in the aggregates and uneven particle size distribution, which seriously restricts the performance of carbon black regenerated from cracked carbon slag as a rubber reinforcing agent. Based on this, the present invention prepares a modified silane coupling agent. On the one hand, the dual-phase filler of carbon black and white carbon black in the regenerated carbon black reinforcing agent system can be efficiently dispersed, and the components of the system can be promoted to play a better reinforcing effect on the cracked carbon slag. On the other hand, when it modifies the cracked carbon slag, the physical entanglement interaction of the polymer chain with polybutadiene as the main chain increases, which can effectively improve the elasticity and durability of the regenerated carbon black from the cracked carbon slag. On the other hand, the unreacted double bonds that may exist on the main chain of the modified silane coupling agent can supplement the cross-linking points between the regenerated carbon black reinforcing agent and the rubber matrix, which to a certain extent solves the application defects of the regenerated carbon black from the cracked carbon slag in the reinforcement of the rubber substrate due to the weak interaction force between the regenerated carbon black from the cracked carbon slag and the rubber matrix and the low cross-linking density. The chemical bonding bridging effect can maximize the reinforcing effect of the regenerated carbon black from the cracked carbon slag, which is beneficial to improve the tensile stress of the regenerated carbon black from the cracked carbon slag, and is beneficial to its partial replacement application for commercial carbon black, thereby reducing the reinforcement cost of the rubber base material.

[0036] In some embodiments of the present invention, the mesh size of the calcium sulfate whiskers is 1000-2000 mesh.

[0037] Preferably, the mesh size of the calcium sulfate whiskers is 1250 mesh.

[0038] Preferably, the tackifying resin is C9 petroleum resin.

[0039] Preferably, the carbon black is carbon black N660.

[0040] On the other hand, the present invention also provides a method for preparing a regenerated carbon black reinforcing agent, comprising the following steps: adding a vulcanization accelerator, stearic acid, a tackifying resin, modified nano zinc oxide, calcium sulfate whiskers, white carbon black, carbon black and a modified silane coupling agent in a reactor in sequence, mixing and stirring to obtain the regenerated carbon black reinforcing agent.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] (1) The regenerated carbon black reinforcing agent prepared by the present invention is a high-performance modifier. When used for cracking carbon slag modification, it can effectively improve the reinforcing performance of cracking carbon slag. The 300% elongation strength and tensile strength can meet the reinforcing agent standards. It can replace part of commercial carbon black as a reinforcing agent and has a high application prospect.

[0043] (2) In the present invention, a specific mass of hexamethylenetetramine rich in active amines is added as a vulcanization accelerator. When it is added to the system, part of the active amines are preferentially adsorbed on the surface of white carbon black and carbon black in the system, effectively reducing the adsorption of white carbon black and carbon black on other components of the system, avoiding the delayed vulcanization phenomenon, and ensuring the performance of the regenerated carbon black reinforcing agent;

[0044] (3) The present invention uses zinc nitrate and triethanolamine aqueous solution as raw materials for synthesizing nano zinc oxide, and introduces sodium carboxymethyl cellulose in situ for grafting modification. The modified nano zinc oxide can achieve uniform dispersion, which not only reduces the collision and agglomeration of nano zinc oxide particles, but also ensures the stability of the particle size and crystal form of nano zinc oxide. At this time, the exposed active sites increase, the activation stability is enhanced, and the regenerated carbon black reinforcing agent system can effectively and quickly play an activation role when added as a vulcanization activator; on the other hand, the ash of the cracked carbon slag contains a large amount of zinc oxide. When the regenerated carbon black reinforcing agent containing modified nano zinc oxide is added to the cracked carbon slag, the zinc oxide particles can be evenly dispersed, and a more efficient activation effect can be played, while reducing the impact on the structure of the regenerated carbon black of the cracked carbon slag;

[0045] (4) The present invention prepares a terminal ethoxy modified silane coupling agent, which can achieve efficient dispersion of the dual-phase filler of carbon black and white carbon black in the regenerated carbon black reinforcing agent system on the one hand, and promote the various components of the system to exert a better reinforcing effect on the cracked carbon slag; on the other hand, when it modifies the cracked carbon slag, the physical entanglement interaction of the polymer chain with polybutadiene as the main chain increases, which can effectively improve the elasticity and durability of the regenerated carbon black from the cracked carbon slag; on the other hand, the unreacted double bonds that may exist on the main chain of the modified silane coupling agent can supplement the cross-linking points between the regenerated carbon black reinforcing agent and the rubber matrix to generate supplementary cross-linking bonds, which to a certain extent solves the application defects of the regenerated carbon black from the cracked carbon slag in the reinforcement of rubber substrates due to the weak interaction force between the regenerated carbon black from the cracked carbon slag and the rubber matrix and the low cross-linking density. The chemical bonding bridging effect can maximize the reinforcing effect of the regenerated carbon black from the cracked carbon slag, which is beneficial to improve the tensile stress of the regenerated carbon black from the cracked carbon slag, and is beneficial to its partial replacement of commercial carbon black and reducing the reinforcement cost of rubber base materials. DETAILED DESCRIPTION

[0046] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following embodiments are examples of the present invention and are only used to illustrate the present invention, but not to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed without departing from the spirit or scope of the present invention.

[0047] If not otherwise specified, the reagents used below can be easily obtained from commercial companies, among which sodium carboxymethyl cellulose was purchased from Wuhan Jixin Yibang Biotechnology Co., Ltd., nano zinc oxide was purchased from Fujian Zhongwei Semiconductor Materials Co., Ltd., triethoxysilane-modified liquid polybutadiene was purchased from Evonik Industrial Group of Germany, calcium sulfate whiskers (mesh size 1250 mesh) were purchased from Shijiazhuang Chaowei New Material Technology Co., Ltd., C9 petroleum resin was purchased from Dongguan County Jinda Chemical Co., Ltd., cracked carbon slag was purchased from Chengdu Duobaoli Building Materials Co., Ltd., and polyethylene glycol (model PEG4000) was purchased from Wuhan Huaxiang Kejie Biotechnology Co., Ltd.

[0048] Preparation Example 1

[0049] The preparation steps of modified nano zinc oxide are as follows:

[0050] 0.06 g PEG4000, 20 mL 40 wt % zinc nitrate solution and 0.004 g sodium carboxymethyl cellulose were added to the reactor in sequence, and after stirring evenly, 50.5 mL 20 wt % triethanolamine aqueous solution and 379 mL anhydrous ethanol were added. After stirring for 1.5 h, the mixture was transferred to another reactor, heated to 183 ° C and reacted for 20 min. The mixture was cooled to room temperature, centrifuged, washed twice with anhydrous ethanol and twice with deionized water, dried at 55 ° C to constant weight, and ground to obtain modified nano zinc oxide with a particle size of 300 nm.

[0051] Preparation Example 2

[0052] The preparation steps of modified nano zinc oxide are the same as those of Preparation Example 1, except that 0.0096 g of sodium carboxymethyl cellulose is added.

[0053] Preparation Example 3

[0054] The preparation steps of modified nano zinc oxide are as follows:

[0055] 0.04 g of sodium carboxymethyl cellulose and 0.8 g of nano zinc oxide were added to the reactor in sequence, stirred evenly, heated to 150°C and reacted for 20 min, cooled to room temperature, centrifuged, washed twice with anhydrous ethanol and twice with deionized water, dried at 55°C to constant weight, and ground to obtain modified nano zinc oxide with a particle size of 300 nm.

[0056] Preparation Example 4

[0057] The preparation steps of modified silane coupling agent are as follows:

[0058] Add 29.4g of tetrahydrofuran to the reactor, add 10g of triethoxysilane-modified liquid polybutadiene and 1.75g ​​of bis-(γ-triethoxysilylpropyl) tetrasulfide in sequence, stir evenly, heat to 65°C, keep stirring at a constant temperature, react for 1.5h, cool to room temperature after the reaction, remove tetrahydrofuran with a rotary evaporator, and wash 3 times with anhydrous ethanol to obtain a modified silane coupling agent.

[0059] Preparation Example 5

[0060] The preparation steps of the modified silane coupling agent are the same as those of Preparation Example 4, except that 0.5 g of bis-(γ-triethoxysilylpropyl)tetrasulfide is added.

[0061] Preparation Example 6

[0062] The preparation steps of the modified silane coupling agent are the same as those of Preparation Example 4, except that 3 g of bis-(γ-triethoxysilylpropyl)tetrasulfide is added.

[0063] Unless otherwise specified, in the following examples and comparative examples, the vulcanization accelerator is hexamethylenetetramine, the tackifying resin is C9 petroleum resin, and the carbon black is carbon black N660.

[0064] Example 1

[0065] A regenerated carbon black reinforcing agent, comprising the following raw materials in parts by weight: 30 parts of a vulcanization accelerator, 7.3 parts of stearic acid, 6 parts of a tackifying resin, 1.8 parts of modified nano zinc oxide, 1.1 parts of calcium sulfate whiskers, 1.1 parts of white carbon black, 11 parts of carbon black and 3 parts of a modified silane coupling agent;

[0066] The preparation method of the regenerated carbon black reinforcing agent of this embodiment comprises the following steps: adding a vulcanization accelerator, stearic acid, a tackifying resin, modified nano zinc oxide, calcium sulfate whiskers, white carbon black, carbon black and a modified silane coupling agent in a reactor in sequence, mixing and stirring, and obtaining the regenerated carbon black reinforcing agent;

[0067] The modified nano zinc oxide in this embodiment is obtained from Preparation Example 1, and the modified silane coupling agent is obtained from Preparation Example 4.

[0068] Example 2

[0069] A regenerated carbon black reinforcing agent, comprising the following raw materials in parts by weight: 50 parts of a vulcanization accelerator, 12 parts of stearic acid, 10 parts of a tackifying resin, 3 parts of modified nano zinc oxide, 2 parts of calcium sulfate whiskers, 2 parts of white carbon black, 18 parts of carbon black and 5 parts of a modified silane coupling agent;

[0070] The preparation method of the regenerated carbon black reinforcing agent in this embodiment has the same specific steps as in Example 1;

[0071] The modified nano zinc oxide in this embodiment is obtained from Preparation Example 1, and the modified silane coupling agent is obtained from Preparation Example 4.

[0072] Example 3

[0073] A regenerated carbon black reinforcing agent, comprising the following raw materials in parts by weight: 10 parts of a vulcanization accelerator, 2.5 parts of stearic acid, 2 parts of a tackifying resin, 0.5 parts of modified nano zinc oxide, 0.2 parts of calcium sulfate whiskers, 0.2 parts of white carbon black, 4 parts of carbon black and 1 part of a modified silane coupling agent;

[0074] The preparation method of the regenerated carbon black reinforcing agent in this embodiment has the same specific steps as in Example 1;

[0075] The modified nano zinc oxide in this embodiment is obtained from Preparation Example 1, and the modified silane coupling agent is obtained from Preparation Example 4.

[0076] Example 4

[0077] A regenerated carbon black reinforcing agent and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the modified nano zinc oxide used is obtained from Preparation Example 2.

[0078] Example 5

[0079] A regenerated carbon black reinforcing agent and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the modified nano zinc oxide used is obtained from Preparation Example 3.

[0080] Example 6

[0081] A regenerated carbon black reinforcing agent and a preparation method thereof. The specific implementation manner is the same as that of Example 1, except that the modified silane coupling agent used is obtained from Preparation Example 5.

[0082] Example 7

[0083] A regenerated carbon black reinforcing agent and a preparation method thereof. The specific implementation manner is the same as that of Example 1, except that the modified silane coupling agent used is obtained from Preparation Example 6.

[0084] Comparative Example 1

[0085] A regenerated carbon black reinforcing agent and a preparation method thereof, wherein the specific implementation manner is the same as that of Example 1, except that an equal amount of nano zinc oxide is used to replace the modified nano zinc oxide.

[0086] Comparative Example 2

[0087] A regenerated carbon black reinforcing agent and a preparation method thereof. The specific implementation manner is the same as that of Example 1, except that the modified silane coupling agent is replaced by an equal amount of bis-(γ-triethoxysilylpropyl) tetrasulfide.

[0088] Performance Testing

[0089] The regenerated carbon black reinforcing agent obtained in the above examples and comparative examples was mixed with cracked carbon slag in a mass ratio of 1:1, and the following performance tests were performed. The specific test results are shown in Table 1:

[0090] (1) Tensile strength test: The tensile strength is tested in accordance with standard GB / T 528-2009;

[0091] (2) 300% tensile stress test: 300% tensile stress is tested in accordance with standard GB / T 528-2009.

[0092] Table 1

[0093] project Tensile strength / MPa 300% constant tensile stress / MPa Example 1 20.2 10.10 Example 2 19.8 9.95 Example 3 20.1 9.97 Example 4 18.3 9.73 Example 5 17.9 9.65 Example 6 17.7 9.47 Example 7 17.6 9.55 Comparative Example 1 15.0 9.05 Comparative Example 2 15.9 9.35

[0094] As shown in Table 1, the tensile strength and 300% modulus of tensile stress of the carbon black reinforcing agent provided in Examples 1 to 3 of the present invention are improved, and the reinforcing performance is good;

[0095] In Example 4, the amount of sodium carboxymethyl cellulose added as a modifier in the preparation process of modified nano zinc oxide was changed. In Example 5, sodium carboxymethyl cellulose and nano zinc oxide were directly blended and modified. Compared with Example 1, the modified nano zinc oxide preferably prepared by the present invention can achieve uniform dispersion of zinc oxide in the ash of cracked carbon slag to a certain extent, increase active sites, enhance activation stability, reduce the influence on the structure of carbon black regenerated from cracked carbon slag, and effectively improve tensile strength and 300% elongation stress.

[0096] In Example 6 and Example 7, the amount of bis-(γ-triethoxysilylpropyl)tetrasulfide added during the preparation of the modified silane coupling agent was changed. In Comparative Example 2, bis-(γ-triethoxysilylpropyl)tetrasulfide was directly added as the silane coupling agent. Compared with Example 1, it can be shown that the modified silane coupling agent preferably prepared by the present invention can achieve the dispersion reinforcement of the dual-phase filler of carbon black and white carbon black in the system, and improve the elasticity and durability of the carbon black regenerated from cracked carbon slag by increasing the physical entanglement interaction of the polymer chain, and at the same time, the unreacted double bonds on the main chain are used to generate supplementary cross-linking bonds, thereby improving the tensile stress of the carbon black regenerated from cracked carbon slag;

[0097] By comparing Comparative Example 1 with Example 1, it can be seen that the addition of unmodified nano zinc oxide will cause uneven dispersion of zinc oxide particles, affecting the activation effect, and at the same time have an adverse effect on the structure of carbon black regenerated from cracked carbon slag, resulting in a decrease in the tensile strength and 300% tensile stress improvement effect of carbon black regenerated from cracked carbon slag.

[0098] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A regenerated carbon black reinforcing agent, characterized in that: The regenerated carbon black reinforcing agent comprises the following raw materials in parts by weight: 10 to 50 parts of a vulcanization accelerator, 2.5 to 12 parts of stearic acid, 2 to 10 parts of a tackifying resin, 0.5 to 3 parts of modified nano zinc oxide, 0.2 to 2 parts of calcium sulfate whiskers, 0.2 to 2 parts of white carbon black, 4 to 18 parts of carbon black and 1 to 5 parts of a modified silane coupling agent.

2. A regenerated carbon black reinforcing agent according to claim 1, characterized in that: The vulcanization accelerator is hexamethylenetetramine.

3. A regenerated carbon black reinforcing agent according to claim 1, characterized in that: The preparation steps of the modified nano zinc oxide are as follows: Polyethylene glycol, zinc nitrate solution and modifier are added to the reactor in sequence, and then triethanolamine aqueous solution and anhydrous ethanol are added after stirring evenly. After stirring for 1 to 2 hours, the mixture is transferred to another reactor, heated to 180 to 185° C. and reacted for 10 to 30 minutes. The mixture is cooled to room temperature, centrifuged, washed, dried to constant weight, and ground to obtain modified nano zinc oxide with a particle size distribution range of 100 to 500 nm.

4. A regenerated carbon black reinforcing agent according to claim 3, characterized in that: The modifier is sodium carboxymethyl cellulose.

5. A regenerated carbon black reinforcing agent according to claim 3, characterized in that: The amount of the modifier added is 0.01-0.1% of the mass of zinc nitrate in the zinc nitrate solution.

6. A regenerated carbon black reinforcing agent according to claim 1, characterized in that: The preparation steps of the modified silane coupling agent are as follows: Add tetrahydrofuran into the reactor, add triethoxysilane modified liquid polybutadiene and mercaptosilane coupling agent in sequence, stir evenly, heat to 60-70°C, keep stirring at constant temperature, react for 1-2h, cool to room temperature after the reaction, remove tetrahydrofuran with a rotary evaporator, and then wash with anhydrous ethanol for 1-5 times to obtain the modified silane coupling agent.

7. A regenerated carbon black reinforcing agent according to claim 6, characterized in that: The mercaptosilane coupling agent is bis-(γ-triethoxysilylpropyl) tetrasulfide.

8. A regenerated carbon black reinforcing agent according to claim 6, characterized in that: The mass ratio of the triethoxysilane-modified liquid polybutadiene to the mercaptosilane coupling agent is 2:(0.2-0.5).

9. A regenerated carbon black reinforcing agent according to claim 1, characterized in that: The mesh size of the calcium sulfate whisker is 1000-2000 meshes.

10. A method for preparing the regenerated carbon black reinforcing agent according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: adding a vulcanization accelerator, stearic acid, a tackifying resin, modified nano zinc oxide, calcium sulfate whisker, white carbon black, carbon black and a modified silane coupling agent in a reactor in sequence, mixing and stirring, and obtaining the regenerated carbon black reinforcing agent.