Environment-friendly direct injection type waste rubber powder based asphalt mixture modifier and preparation method thereof

Abstract

The application discloses an environment-friendly direct-throwing waste rubber powder-based asphalt mixture modifier and a preparation method thereof. The modifier comprises base asphalt, coumarone-indene resin, waste rubber powder, grafted eucommia rubber, modifier 1, modifier 2, composite crosslinking agent, dibenzoyl peroxide, N-(2-hydroxyethyl)dodecylamide, cocamide propyl betaine and composite release agent. Compared with traditional rubber asphalt preparation technology, the environment-friendly direct-throwing waste rubber powder-based asphalt mixture modifier avoids pollution emission in the waste rubber powder modified asphalt mixing construction process, saves heat preservation and heating energy consumption in the modified asphalt transportation process, completely solves the problem of heavy pollution of rubber asphalt, and does not need to transform the mixing construction equipment, so that the cost of construction units is greatly saved.

Description

Technical Field

[0001] This invention belongs to the technical field of asphalt mixture modifiers, specifically relating to an environmentally friendly direct-application waste rubber powder-based asphalt mixture modifier and its preparation method. Background Technology

[0002] Current research hotspots in the field of asphalt and asphalt mixtures mainly focus on green, environmentally friendly, high-performance, and convenient construction aspects. These include warm-mix asphalt, foamed asphalt, high-modulus asphalt, self-healing asphalt, and related mixture modification technologies. The implementation of environmentally friendly direct-application waste rubber powder-based asphalt mixture modifiers highly aligns with these research hotspots and development strategies.

[0003] Currently, the preparation process of rubber asphalt faces challenges such as high preparation and construction temperatures, storage difficulties, severe performance degradation, and insufficient workability, necessitating specialized equipment for mixing and paving rubber asphalt mixtures. Furthermore, the high mixing and paving temperatures lead to asphalt aging and severe asphalt fumes, causing significant harm to construction workers and surrounding residents. Current methods to address the heavy pollution and poor workability caused by high mixing and construction temperatures in rubber asphalt primarily involve adding warm mix agents; however, conventional viscosity-reducing warm mix agents are not very effective for rubber asphalt. Therefore, a major challenge in the rubber asphalt industry remains how to mitigate the generation of asphalt fumes during the mixing and construction process.

[0004] To address the problems of heavy pollution, large amounts of smoke, and high construction difficulty in the application of rubber asphalt, we will continue to develop a process or material that can eliminate rubber asphalt smoke and improve construction workability. This will promote the application of rubber asphalt in the highway industry, fully leveraging its advantages such as good noise reduction, strong fatigue resistance, and excellent water damage resistance. At the same time, by preparing rubber asphalt or rubber asphalt mixtures, we can achieve the resource utilization of waste, which will help dispose of solid waste such as waste rubber products and provide technical support for achieving my country's "dual carbon" goals. Summary of the Invention

[0005] To effectively address the problems of heavy pollution, excessive fumes, and insufficient workability during the mixing and paving of waste rubber powder modified asphalt, this invention develops an environmentally friendly direct-application waste rubber powder-based asphalt mixture modifier and its preparation method. Compared to traditional rubber asphalt preparation technologies, this environmentally friendly direct-application waste rubber powder-based asphalt mixture modifier avoids pollution emissions during the mixing and construction of waste rubber powder modified asphalt, while also saving energy consumption for heat preservation and heating during the transportation of modified asphalt. Even if there are changes in the construction schedule, there will be no problems such as unusable modified asphalt or tank blockage due to unloading. Furthermore, it completely solves the problem of heavy pollution from rubber asphalt and does not require modification of mixing and construction equipment, greatly saving costs for construction units.

[0006] The composition of the environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier includes base petroleum asphalt, coumarone-indene resin, waste rubber powder, grafted eucommia gum, modifier 1, modifier 2, composite crosslinking agent, benzoyl peroxide, N-(2-hydroxyethyl)dodecylamide, cocamidopropyl betaine, and composite release agent.

[0007] The base petroleum asphalt is grade 70# or 90#.

[0008] The waste rubber powder needs to be preheated to 80-100℃, and the specifications are radial tire rubber powder or bias tire rubber powder, with a mesh size of 30-60 mesh.

[0009] The softening point of the coumarone-indene resin is not lower than 110℃-130℃.

[0010] The modifier 1 is SBS, and its specifications are one or more of 30 / 70 linear, 40 / 60 linear, 30 / 70 star-shaped, and 40 / 60 star-shaped.

[0011] The composite crosslinking agent is composed of 65wt% of 400-mesh calcium powder, 20-25wt% of 200 or 400-mesh sulfur powder, 5-10wt% of 100-300nm nano zinc oxide powder, and 5wt% of 4,4'-dithiodimorpholine.

[0012] The modifier 2 is EVA and / or POE, wherein the EVA has a VA content of 9% to 28% and a melt index of 2.0 to 3.0 g / 10 min, and the POE has a melt index of 2.0 to 3.0 g / 10 min and a softening point ≥ 85℃.

[0013] The composite isolating agent is composed of 10-20 wt% palmitamide propyl dimethylamine lactate, 20-25 wt% sodium di(2-ethylhexyl) succinate sulfonate and 55-70 wt% talc.

[0014] The preparation method of the aforementioned environmentally friendly direct-application waste rubber powder-based asphalt mixture modifier is as follows:

[0015] 1) Weigh 100 parts by weight of base petroleum asphalt and add it to the development tank. Protect it with nitrogen gas and stir at 300-500 rpm for 3-5 minutes at 230-280℃. Add 20-50 parts by weight of coumarone-indene resin and continue stirring for 5-10 minutes. Then add 100-250 parts by weight of waste rubber powder in batches. After the addition is complete, shear at 2000-8000 rpm for 30-90 minutes at 230-280℃. Then add 10-30 parts by weight of grafted eucommia gum. Keep the temperature and shear rate constant and react for 10-20 minutes to make it a uniform fluid without particles.

[0016] 2) Weigh 20-30% of the mass of the base petroleum asphalt and add modifier 1 to the above-mentioned development tank. Adjust the reaction temperature to 230-250℃ and shear the reaction at 6000-8000 rpm for 20-30 min under nitrogen protection.

[0017] 3) Pump the product obtained in step 2) into the reaction tank using a high-viscosity asphalt pump. At the same time, add 0.1-0.2% of the composite crosslinking agent by weight of waste rubber powder. Maintain the temperature of the reaction tank at 230-250℃, adjust the stirring speed to 1000-2000 rpm, purge with nitrogen for protection, increase the pressure of the reaction tank to 3-5 MPa, and stir for 30-60 minutes.

[0018] 4) Add 0.3-0.5% benzoyl peroxide, 3-5% N-(2-hydroxyethyl)dodecylamide, 1-3% modifier 2, and 1-2% cocamidopropyl betaine to the reaction vessel by total mass. Purge with nitrogen and maintain the pressure at 3-5 MPa. Reduce the reaction temperature to 200℃±10℃ and maintain the stirring speed at 1000-2000 rpm for 20-30 min.

[0019] 5) The material is conveyed to the twin-screw extruder through the discharge port of the reaction tank. The heating temperature of the twin-screw extruder is maintained at 130-150℃. The material is extruded into 2-5mm granules through the twin-screw extruder. The temperature of the granules is reduced to 50-80℃ through the air-cooling device at the discharge port of the twin-screw extruder. After cooling, the granules are uniformly coated with the composite release agent.

[0020] The exhaust pipe of the development tank is connected to the inlet pipe of the reaction tank, the exhaust pipe of the reaction tank is connected to spray tower 1, and spray tower 1 is connected to spray tower 2. The spray liquid of spray tower 1 is a 2-5% NaOH aqueous solution, and the spray liquid of spray tower 2 is a 2-5% H2SO4 aqueous solution. The exhaust gas discharged from the reaction tank passes through spray tower 1 and spray tower 2, is dehydrated by a dryer, and then passes through a regenerative thermal oxidizer to remove the remaining VOCs in the exhaust gas before being discharged after meeting the standards.

[0021] The advantages of this invention are:

[0022] 1. This environmentally friendly direct-application waste rubber powder-based asphalt mixture modifier granules can directly modify asphalt mixtures without the need to prepare rubber asphalt. Therefore, it does not require much adjustment to equipment and processes during construction, greatly improving the adaptability of the project. At the same time, since the modifier granules contain asphalt components, they can effectively reduce the asphalt-aggregate ratio of the asphalt mixture, saving the amount of asphalt used.

[0023] 2. The environmentally friendly direct-discharge waste rubber powder-based asphalt mixture modifier particles contain palmitamide propyl dimethylamine lactate and sodium di(2-ethylhexyl) succinate sulfonate in the composite release agent on the surface. In addition to acting as a release agent between modifier particles together with talc, they are also good surfactants. They can reduce the mixing temperature of the mixture to a certain extent and further reduce the emission of polluting gases during the asphalt mixture mixing and construction process.

[0024] 3. The amino and alcoholic hydroxyl groups contained in N-(2-hydroxyethyl)dodecylamide and cocamidopropyl betaine added during the preparation of this environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier can react with SO2 and nitrogen oxides in rubber asphalt fumes, effectively reducing nitrogen and sulfur compounds in the fumes, thereby achieving a deodorizing effect on the asphalt mixture.

[0025] 4. Simultaneously, during the preparation process of this environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier, 4,4'-dithiodimorpholine, under the action of benzothiazole and methylthiophene produced by the high-temperature decomposition of waste rubber powder, can more efficiently promote the crosslinking reaction between the crosslinking agent and the waste rubber powder and SBS modifier, thereby improving the network structure of the environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier. As a result, after the modified mixture is prepared, the high-temperature performance and water loss resistance of the asphalt and the mixture itself are significantly improved. Detailed Implementation

[0026] To better understand this invention, the following embodiments further illustrate its content; however, the invention is not limited to these embodiments. If the experiments and construction based on this invention do not involve creative improvements or labor by the construction personnel, then these embodiments also fall within the scope of protection of this invention.

[0027] The values ​​in this embodiment are all test values ​​under laboratory and pilot-scale conditions. In order to better compare the differences with existing rubber asphalt, the indicators tested in this experiment are all based on 20% waste rubber powder modified asphalt and its mixture.

[0028] Example 1:

[0029] The preparation method of the aforementioned environmentally friendly direct-application waste rubber powder-based asphalt mixture modifier includes the following steps:

[0030] 1) Weigh 100 parts of 90# base petroleum asphalt and add it to the development tank. Protect it with nitrogen gas and stir at 300 rpm for 5 minutes at 230℃. Add 20 parts of coumarone-indene resin and continue stirring for 5 minutes. Then add 100 parts of 60-mesh bias tire waste rubber powder (preheated to 100℃) in batches. After the addition is complete, raise the temperature to 250±10℃ and shear at 5000 rpm for 50 minutes. Then add 10 parts of grafted eucommia gum and keep the temperature and shearing speed constant. React for 20 minutes to make it a uniform fluid without particles.

[0031] 2) Weigh 20 parts of the mass of asphalt and add 30 / 70 type linear SBS to the above-mentioned development tank. Adjust the reaction temperature to 230℃ and shear the reaction at 6000 rpm for 20 min under nitrogen protection.

[0032] 3) Pump the product obtained in 2) into the reaction tank using a high-viscosity asphalt pump, and simultaneously add 0.1 parts by weight of waste rubber powder of composite crosslinking agent (65% 400-mesh calcium powder, 20% 200-mesh sulfur powder, 10% 100nm nano zinc oxide powder, and 5% 4,4'-dithiodimorpholine). Maintain the reaction tank temperature at 230℃, adjust the stirring speed to 1000rpm, purge with nitrogen for protection, increase the reaction tank pressure to 5MPa, and stir for 30min.

[0033] 4) Add 0.3% benzoyl peroxide, 3% N-(2-hydroxyethyl)dodecylamide, 3% EVA (VA content 9%, melt index 2.0 g / 10 min), and 1% cocamidopropyl betaine by total mass to the reaction vessel. Purge with nitrogen to maintain a pressure of 5 MPa, lower the reaction temperature to 200℃±10℃, maintain a stirring speed of 2000 rpm, and react for 20 min to prepare an environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier.

[0034] 5) The environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier is conveyed to the twin-screw extruder through the discharge port of the reaction tank. The heating temperature of the twin-screw extruder is maintained at 130℃. The environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier is formed into 5mm environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier granules through the twin-screw extruder discharge port air cooling device to reduce the temperature of the granules to below 65℃. After cooling, the environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier granules are uniformly coated with a composite release agent (10% palmitamide propyl dimethylamine lactate, 25% sodium di(2-ethylhexyl) succinate sulfonate and 65% talc).

[0035] The exhaust pipe of the development tank is connected to the inlet pipe of the reaction tank, and the exhaust pipe of the reaction tank is connected to spray tower 1. Spray tower 1 is connected to spray tower 2. The spray liquid of spray tower 1 is a 2% NaOH aqueous solution, and the spray liquid of spray tower 2 is a 2% H2SO4 aqueous solution. The exhaust gas discharged from the reaction tank passes through spray tower 1 and spray tower 2, and after being dehydrated by a dryer, it passes through a regenerative thermal oxidizer to remove the remaining VOCs in the exhaust gas.

[0036] The prepared environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier particles were used to modify 70# base asphalt mixture at a dosage of 3% of the asphalt mixture. The gradation was AC-13, the optimal asphalt-aggregate ratio was determined to be 3.4%, the mixing temperature was 165℃, and the measured VOCs were 54 mg / m³. 3 The dynamic stability, Marshall stability, and freeze-thaw splitting strength ratio of the mixture were tested.

[0037] Example 2:

[0038] The preparation method of the aforementioned environmentally friendly direct-application waste rubber powder-based asphalt mixture modifier includes the following steps:

[0039] 1) Weigh 100 parts of base petroleum asphalt and add it to the development tank. Protect it with nitrogen gas and stir at 500 rpm for 5 minutes at 280°C. Add 50 parts of coumarone-indene resin and continue stirring for 10 minutes. Then add 250 parts of 30-mesh radial tire waste rubber powder in batches. After the addition is complete, shear at 8000 rpm for 90 minutes at 280°C. Then add 30 parts of grafted eucommia gum and keep the temperature and shearing speed constant. React for 20 minutes to make it a uniform fluid without particles.

[0040] 2) Weigh 30% of the mass of asphalt and add 40 / 60 star-shaped SBS to the above-mentioned development tank. Adjust the reaction temperature to 250℃ and shear the reaction at 8000 rpm for 30 min under nitrogen protection.

[0041] 3) Pump the product obtained in 2) into the reaction tank using a high-viscosity asphalt pump, and simultaneously add 0.2% of the weight of waste rubber powder as a composite crosslinking agent (65% of 400-mesh calcium powder, 25% of 400-mesh sulfur powder, 5% of 150nm nano zinc oxide powder, and 5% of 4,4'-dithiodimorpholine). Maintain the reaction tank temperature at 250℃, adjust the stirring speed to 2000rpm, purge with nitrogen for protection, increase the reaction tank pressure to 5MPa, and stir for 60min.

[0042] 4) Add 0.5% benzoyl peroxide, 5% N-(2-hydroxyethyl) dodecylamide, 1% POE (melt index 3.0 g / 10 min, softening point 95℃) and 2% cocamidopropyl betaine by total mass to the reaction vessel, purge with nitrogen to maintain a pressure of 5 MPa, reduce the reaction temperature to 200℃±10℃, maintain a stirring speed of 1000 rpm, and react for 25 min to prepare an environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier;

[0043] 5) The environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier is conveyed to the twin-screw extruder through the discharge port of the reaction tank. The heating temperature of the twin-screw extruder is maintained at 150℃. The environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier is formed into 4mm environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier granules through the twin-screw extruder discharge port air cooling device to reduce the temperature of the granules to no more than 70℃. After cooling, the environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier granules are uniformly coated with a composite release agent (20% palmitamide propyl dimethylamine lactate, 20% sodium di(2-ethylhexyl) succinate sulfonate and 55% talc).

[0044] The exhaust pipe of the development tank is connected to the inlet pipe of the reaction tank, and the exhaust pipe of the reaction tank is connected to spray tower 1. Spray tower 1 is connected to spray tower 2. The spray liquid of spray tower 1 is a 5% NaOH aqueous solution, and the spray liquid of spray tower 2 is a 5% H2SO4 aqueous solution. The exhaust gas discharged from the reaction tank passes through spray tower 1 and spray tower 2, and after being dehydrated by a dryer, it passes through a regenerative thermal oxidizer to remove the remaining VOCs in the exhaust gas.

[0045] The prepared environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier particles were used to modify 70# base asphalt mixture at a dosage of 3% of the asphalt mixture. The gradation was AC-13, the optimal asphalt-aggregate ratio was determined to be 3.6%, and the mixing temperature was 160℃. The measured VOCs were 47 mg / m³. 3 The dynamic stability, Marshall stability, and freeze-thaw splitting strength ratio of the mixture were tested.

[0046] Example 3:

[0047] The method for preparing the environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier particles is the same as in Example 2. It is used to modify 70# base asphalt mixture at a dosage of 5% of the asphalt mixture. The gradation is AC-13, the optimal asphalt-aggregate ratio is determined to be 2.9%, the mixing temperature is 155℃, and the measured VOCs are 35 mg / m³. 3 The dynamic stability, Marshall stability, and freeze-thaw splitting strength ratio of the mixture were tested.

[0048] Example 4:

[0049] The preparation method of the aforementioned environmentally friendly direct-application waste rubber powder-based asphalt mixture modifier includes the following steps:

[0050] 1) Weigh 100 parts of base petroleum asphalt and add it to the development tank. Protect it with nitrogen gas and stir at 500 rpm for 5 minutes at 280°C. Add 50 parts of coumarone-indene resin and continue stirring for 10 minutes. Then add 150 parts of 40-mesh radial tire waste rubber powder in batches. After the addition is complete, shear it at 7000 rpm for 80 minutes at 260°C. Then add 25 parts of grafted eucommia gum and keep the temperature and shearing speed constant. React for 15 minutes to make it a uniform fluid without particles.

[0051] 2) Weigh 10% of the mass of 40 / 60 linear SBS and 5% of 30 / 70 star-shaped SBS and add them to the above-mentioned development tank. Adjust the reaction temperature to 240℃ and shear the reaction at 7000 rpm for 30 min under nitrogen protection.

[0052] 3) Pump the product obtained in 2) into the reaction tank using a high-viscosity asphalt pump, and simultaneously add 0.15% of the weight of waste rubber powder as a composite crosslinking agent (65% of 400-mesh calcium powder, 20% of 200-mesh sulfur powder, 10% of 300nm nano zinc oxide powder, and 5% of 4,4'-dithiodimorpholine). Maintain the reaction tank temperature at 240℃, adjust the stirring speed to 1500rpm, purge with nitrogen for protection, increase the pressure of the reaction tank to 3MPa, and stir for 50min.

[0053] 4) Add 0.4% benzoyl peroxide, 4% N-(2-hydroxyethyl)dodecylamide, 1% EVA (VA content 15%, melt index 2.3 g / 10 min), 1% POE (melt index 2.0 g / 10 min, softening point 85℃), and 1% cocamidopropyl betaine by total mass to the reaction vessel. Purge with nitrogen to maintain a pressure of 3 MPa, lower the reaction temperature to 200℃±10℃, maintain a stirring speed of 1000 rpm, and react for 20 min to prepare an environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier.

[0054] 5) The environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier is conveyed to the twin-screw extruder through the discharge port of the reaction tank. The heating temperature of the twin-screw extruder is maintained at 150℃. The environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier is formed into 3mm environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier granules through the twin-screw extruder discharge port air cooling device to reduce the temperature of the granules to no more than 70℃. After cooling, the environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier granules are uniformly coated with a composite release agent (15% palmitamide propyl dimethylamine lactate, 20% sodium di(2-ethylhexyl) succinate sulfonate and 65% talc).

[0055] The exhaust pipe of the development tank is connected to the inlet pipe of the reaction tank, and the exhaust pipe of the reaction tank is connected to spray tower 1. Spray tower 1 is connected to spray tower 2. The spray liquid of spray tower 1 is a 4% NaOH aqueous solution, and the spray liquid of spray tower 2 is a 4% H2SO4 aqueous solution. The exhaust gas discharged from the reaction tank passes through spray tower 1 and spray tower 2, and after being dehydrated by a dryer, it passes through a regenerative thermal oxidizer to remove the remaining VOCs in the exhaust gas.

[0056] The prepared environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier particles were used to modify 70# base asphalt mixture at a dosage of 4% of the asphalt mixture. The gradation was AC-13, the optimal asphalt-aggregate ratio was determined to be 3.2%, the mixing temperature was 165℃, and the measured VOCs were 51 mg / m³. 3 The dynamic stability, Marshall stability, and freeze-thaw splitting strength ratio of the mixture were tested.

[0057] For comparison, 20 parts of 30-mesh radial tire rubber powder were used to modify 80 parts of 70# base asphalt. The modification temperature was 200–210℃, and the shearing time was 60 min. The asphalt mixture adopted AC-13 gradation, with an optimal asphalt-aggregate ratio of 5.8% and a mixing temperature of 190℃. The measured VOCs were 233 mg / m³. 3 The dynamic stability, Marshall stability, and freeze-thaw splitting strength ratio of the mixture were tested.

[0058] The performance tests are shown in the table below, and the test methods refer to relevant standards. VOCs refers to the VOCs content in a unit volume of asphalt fumes during the mixing process.

[0059] The performance is as follows:

[0060]

Claims

1. A preparation method of an environmentally friendly direct injection type waste rubber powder based asphalt mixture modifier, characterized in that, The composition of the environmentally friendly direct-injection waste rubber powder-based asphalt mixture modifier includes base petroleum asphalt, coumarone-indene resin, waste rubber powder, grafted eucommia gum, modifier 1, modifier 2, composite crosslinking agent, benzoyl peroxide, N-(2-hydroxyethyl)dodecylamide, cocamidopropyl betaine, and composite release agent. The softening point of the coumarone-indene resin is not lower than 110℃-130℃; The modifier 1 is SBS, and its specifications are one or more of 30 / 70 linear, 40 / 60 linear, 30 / 70 star, and 40 / 60 star. The modifier 2 is EVA and / or POE; The specific steps of the preparation method are as follows: 1) Weigh 100 parts by weight of base petroleum asphalt and add it to the development tank. Purge with nitrogen and stir at 300-500 rpm for 3-5 minutes at 230-280℃. Add 20-50 parts by weight of coumarone-indene resin and continue stirring for 5-10 minutes. Then add 100-250 parts by weight of waste rubber powder in batches. After the addition is complete, shear at 2000-8000 rpm for 30-90 minutes at 230-280℃. Then add 10-30 parts by weight of grafted eucommia gum. Keep the temperature and shear rate constant and react for 10-20 minutes to make it a uniform fluid without particles. 2) Weigh 20-30% of the mass of the base petroleum asphalt and add the modifier 1 to the above-mentioned development tank. Adjust the reaction temperature to 230-250℃ and shear the reaction at 6000-8000 rpm for 20-30 minutes under nitrogen protection. 3) Pump the product obtained in step 2) into the reaction tank using a high-viscosity asphalt pump. At the same time, add 0.1-0.2% of the composite crosslinking agent by weight of waste rubber powder. Maintain the temperature of the reaction tank at 230-250℃, adjust the stirring speed to 1000-2000 rpm, purge with nitrogen for protection, increase the pressure of the reaction tank to 3-5 MPa, and stir for 30-60 minutes. 4) Add 0.3-0.5% benzoyl peroxide, 3-5% N-(2-hydroxyethyl)dodecylamide, 1-3% modifier 2, and 1-2% cocamidopropyl betaine to the reaction vessel. Purge with nitrogen and maintain the pressure at 3-5 MPa. Reduce the reaction temperature to 200℃±10℃ and maintain the stirring speed at 1000-2000 rpm for 20-30 min. 5) The material is conveyed to the twin-screw extruder through the discharge port of the reaction tank. The heating temperature of the twin-screw extruder is maintained at 130-150℃. The material is extruded into 2-5mm granules through the twin-screw extruder. The temperature of the granules is reduced to 50-80℃ through the air-cooling device at the discharge port of the twin-screw extruder. After cooling, the granules are uniformly coated with the composite release agent. The composite crosslinking agent is composed of 65wt% of 400-mesh calcium powder, 20-25wt% of 200 or 400-mesh sulfur powder, 5-10wt% of 100-300nm nano zinc oxide powder, and 5wt% of 4,4'-dithiodimorpholine. The composite isolating agent is composed of 10-20 wt% palmitamide propyl dimethylamine lactate, 20-25 wt% sodium di(2-ethylhexyl) succinate sulfonate and 55-70 wt% talc.

2. The preparation method according to claim 1, characterized in that, The base petroleum asphalt is grade 70# or 90#.

3. The preparation method according to claim 1, characterized in that, The waste rubber powder needs to be preheated to 80-100℃, and the specifications are radial tire rubber powder or bias tire rubber powder, with a mesh size of 30-60 mesh.

4. The preparation method according to claim 1, characterized in that, The exhaust pipe of the development tank is connected to the inlet pipe of the reaction tank, the exhaust pipe of the reaction tank is connected to spray tower 1, and spray tower 1 is connected to spray tower 2. The spray liquid of spray tower 1 is a 2-5% NaOH aqueous solution, and the spray liquid of spray tower 2 is a 2-5% H2SO4 aqueous solution. The exhaust gas discharged from the reaction tank passes through spray tower 1 and spray tower 2, is dehydrated by a dryer, and then passes through a regenerative thermal oxidizer to remove the remaining VOCs in the exhaust gas before being discharged after meeting the standards.

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