Anti-rutting epoxy asphalt toughening additive and preparation method thereof

Abstract

The invention belongs to the technical field of road and bridge paving materials, and discloses an anti-rutting epoxy asphalt toughening additive. The formula comprises the following components in parts by weight: 40 parts of solid epoxy resin, 35 parts of a latent polyester curing agent, 5 parts of an ultra-high molecular weight epoxy toughening agent, 20 parts of a water damage resistant improver, 100 parts of hard asphalt particles, 2 parts of an antioxidant, 5.5 parts of a silane coupling agent, 6 parts of nano silicon dioxide, 0.1 part of a curing accelerator, 0.5 part of a light stabilizer and 1 part of a lubricating separant. In the formula, solid epoxy reacts with a latent polyester curing agent to form a three-dimensional rigid structure, and the three-dimensional rigid structure is matched with oxidized asphalt particles and nano silicon dioxide, so that the high-temperature stability and the pressure resistance are remarkably improved, and ruts are inhibited from the source; the ultra-high molecular weight epoxy flexibilizer can prolong the molecular chain segment of a cross-linking point, and is combined with the curing accelerator to regulate and control the reaction rate, so that the low-temperature crack resistance and fatigue resistance are enhanced while the strength is ensured.

Description

Technical Field

[0001] This invention belongs to the field of road and bridge paving materials technology, specifically a rutting-resistant epoxy asphalt toughening additive and its preparation method. Background Technology

[0002] Rutting-resistant epoxy asphalt is a functional asphalt material that modifies ordinary asphalt with epoxy resin and its curing agent to significantly improve the high-temperature stability of the pavement and reduce rutting damage. It is mainly used in areas with extremely high requirements for pavement rutting resistance, such as wheel track strips of highways and urban expressways, airport runways, and heavy-duty pavements of cargo ports.

[0003] To meet the long-term traffic demands of highways and urban expressways under high-frequency traffic and heavy loads, pavement rutting resistance has become a core technical indicator. Therefore, a method of reinforcing and modifying asphalt mixtures by adding thermoplastic polyolefins (TPEs) is adopted to improve the high-temperature stability of the mixture and reduce rutting damage caused by repeated vehicle compaction. However, the molecular structures of TPEs and asphalt matrix differ significantly, resulting in inherent incompatibility. Even using the mainstream direct-injection mixing process, uneven dispersion of TPE particles and segregation from the asphalt still occur during high-temperature mixing, leading to localized performance fluctuations in the asphalt mixture and reduced rutting resistance in some areas. Insufficient strength and the presence of thermoplastic polyolefins (TPEs) in some areas affecting adhesion lead to significant uncertainties in the overall performance stability of the pavement. Furthermore, TPE-modified asphalt concrete suffers from a prominent imbalance between high-temperature and low-temperature performance: while TPEs enhance high-temperature rutting resistance, the low-temperature crack toughness of the mixture is significantly reduced. This not only severely limits the potential for improving high-temperature rutting resistance but also makes it unsuitable for use in frigid winter regions and under freezing-thaw cycles, leading to low-temperature cracking and crack propagation, severely impacting pavement lifespan and traffic safety. Therefore, improvements are necessary. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a rutting-resistant epoxy asphalt toughening additive and its preparation method, which has the advantages of excellent low-temperature crack resistance and water stability.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a rutting-resistant epoxy asphalt toughening additive, the formulation comprising the following components in parts by weight: 40 parts solid epoxy resin, 35 parts latent polyester curing agent, 5 parts ultra-high molecular weight epoxy toughening agent, 20 parts water damage resistance enhancer, 100 parts hard asphalt particles, 2 parts antioxidant, 5.5 parts silane coupling agent, 6 parts nano silica, 0.1 parts curing accelerator, 0.5 parts light stabilizer, and 1 part lubricating and isolating agent.

[0006] Preferably, the solid epoxy resin is E-12, the softening point of the solid epoxy resin is 90~93℃, the epoxy equivalent is 741~847g / eq, the latent polyester curing agent is P5998, the softening point of the latent polyester curing agent is 105~115℃, the acid value is 69~79mgKOH / g, and the curing accelerator is 2-methylimidazole.

[0007] Preferably, the ultra-high molecular weight epoxy toughening agent is jER1256, the molecular weight of the ultra-high molecular weight epoxy toughening agent is 51000, the epoxy equivalent is 7800 g / eq, the water loss resistance enhancer is HY811, the softening point of the water loss resistance enhancer is 90~100℃, and the epoxy equivalent is 500~560 g / eq.

[0008] Preferably, the hard asphalt particles are oxidized asphalt, the softening point of the hard asphalt particles is 100~120℃, the nano silica is fumed silica, the particle size of the nano silica is 10~20nm, and the specific surface area is 200~300m² / g.

[0009] Preferably, the antioxidant is antioxidant 1010, the lubricating and isolating agent is AW128 polyethylene microwax powder, the silane coupling agent is KH-560, and the light stabilizer is UV-531.

[0010] A method for preparing a rutting-resistant epoxy asphalt toughening additive, the specific steps of which are as follows:

[0011] Step 1: Preliminary Preparation and Raw Material Pretreatment

[0012] Accurately weigh all materials according to the formula, using an electronic balance to ensure accurate measurements: 40 parts solid epoxy resin, 35 parts latent polyester curing agent, 5 parts ultra-high molecular weight epoxy toughening agent, 100 parts hard asphalt granules, 2 parts antioxidant, 5.5 parts silane coupling agent, 6 parts nano silica, 0.1 parts curing accelerator, 0.5 parts light stabilizer, 1 part lubricating and isolating agent, and 20 parts water loss resistance enhancer;

[0013] Add 6 parts of nano silica and 5.5 parts of silane coupling agent to a planetary mixer and stir at 800 rpm for 15 minutes at room temperature to make the silane coupling agent uniformly coat the surface of nano silica, eliminate agglomeration, and improve subsequent dispersibility, thus preparing a "nano silica-coupling agent complex" for later use.

[0014] Step 2: Low-temperature premixing stage

[0015] First, preheat the high-speed mixer to 80-85℃, then add 40 parts of solid epoxy resin and 20 parts of water loss resistance enhancer. Start stirring and stir at 1200 rpm for 3 minutes until the material softens and is initially mixed. Then add other solid components in batches.

[0016] First batch: Add 35 parts of latent polyester curing agent and 5 parts of ultra-high molecular weight epoxy toughening agent. Stir at 1200 rpm for 5 minutes at 80-85℃ in a high-speed mixer to ensure that the resin, curing agent and toughening agent are in full contact.

[0017] Second batch: Add 2 parts antioxidant, 0.5 parts light stabilizer, and 1 part lubricant and release agent, and continue stirring for 3 minutes. The lubricant and release agent is used to prevent the additives from agglomerating, while the antioxidant and light stabilizer are evenly dispersed in the resin system.

[0018] Third batch: Add the pretreated “nano silica-coupling agent complex”, stir for 4 minutes until the mixture is a uniform powder with no obvious particles or agglomerates, stop stirring, and obtain the premixed powder;

[0019] Step 3: Melt blending and addition of curing accelerator

[0020] First, start the twin-screw extruder, then set the temperatures for each section: 110-115℃ for the feeding section, 125-130℃ for the first plasticizing section, 135-140℃ for the first mixing section, 140-145℃ for the second mixing section, and 135-140℃ for the die head. After the temperatures of each section stabilize, maintain no-load operation for 5 minutes. Then, feed the premixed powder into the twin-screw extruder at a uniform speed using the main feeder. After the powder enters the first mixing section, turn on the side feeder and add 100 parts of hard asphalt granules at a uniform speed to ensure that the asphalt and resin system are mixed according to the formula ratio. When the material enters the second mixing section, slowly inject 0.1 parts of curing accelerator using a liquid injection pump to ensure that the accelerator is evenly dispersed in the molten system and to avoid excessively rapid local curing reactions.

[0021] Step 4: Granulation and Finished Product Processing

[0022] The molten material is extruded from the extruder head to form a continuous cylindrical strip, which is immediately cooled in a water cooling tank for 10-15 seconds. After the surface of the strip hardens, it is fed into a pelletizer to be cut into 2-3mm long particles with a particle size controlled between 20-80 mesh. The cut particles are then sent to a hot air dryer for drying. After drying, they are sieved through an 80-mesh screen to ensure particle uniformity, thus obtaining the finished product of the anti-rutting epoxy asphalt toughening additive.

[0023] Preferably, the screw speed of the twin-screw extruder in step three is set to 300-350 rpm, and the torque of the twin-screw extruder is controlled at 60%-70%.

[0024] Preferably, the curing accelerator described in step three needs to be diluted with a small amount of ethanol, and the concentration of the curing accelerator is diluted to 5%.

[0025] Preferably, the temperature of the hot air dryer in step four is set to 60-70℃, the wind speed is set to 1.5-2m / s, and the drying time of the hot air dryer is set to 30 minutes.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] In this formulation, solid epoxy reacts with latent polyester curing agent to form a three-dimensional rigid structure. Combined with oxidized asphalt particles and nano-silica, it significantly improves high-temperature stability and compressive strength, suppressing rutting at its source. Ultra-high molecular weight epoxy toughening agent can extend the molecular chain segments at the cross-linking points, and combined with curing accelerator to regulate the reaction rate, it enhances low-temperature crack resistance and fatigue resistance while ensuring strength. At the same time, antioxidants and light stabilizers can inhibit oxidation and UV aging, while water damage enhancers and silane coupling agents can strengthen interfacial adhesion and resist water damage. Lubricating and isolating agents can also improve processing fluidity and prevent particle agglomeration, balancing performance and construction convenience, greatly extending the service life of the road surface and reducing maintenance costs. Detailed Implementation

[0028] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] This invention provides a rutting-resistant epoxy asphalt toughening additive, the formulation of which includes the following components in parts by weight: 40 parts solid epoxy resin, 35 parts latent polyester curing agent, 5 parts ultra-high molecular weight epoxy toughening agent, 20 parts water damage resistance enhancer, 100 parts hard asphalt particles, 2 parts antioxidant, 5.5 parts silane coupling agent, 6 parts nano silica, 0.1 parts curing accelerator, 0.5 parts light stabilizer, and 1 part lubricating and isolating agent.

[0030] Solid epoxy reacts with latent polyester curing agents to form a three-dimensional rigid structure. Combined with oxidized asphalt particles and nano-silica, this significantly improves high-temperature stability and compressive strength, fundamentally inhibiting rutting. Ultra-high molecular weight epoxy toughening agents extend the molecular chain segments at crosslinking points and synergistically regulate the reaction rate with curing accelerators, enhancing low-temperature crack resistance and fatigue resistance while ensuring strength. Meanwhile, antioxidants and light stabilizers inhibit oxidation and UV aging, while water damage enhancers and silane coupling agents strengthen interfacial adhesion and resist water damage. Lubricating and isolating agents also improve processing fluidity, prevent particle agglomeration, balance performance and ease of construction, significantly extend the service life of the pavement, and reduce maintenance costs.

[0031] Among them, the solid epoxy resin is E-12, the softening point of the solid epoxy resin is 90~93℃, the epoxy equivalent is 741~847g / eq, the latent polyester curing agent is P5998, the softening point of the latent polyester curing agent is 105~115℃, the acid value is 69~79mgKOH / g, and the curing accelerator is 2-methylimidazole.

[0032] The parameters of P5998 latent polyester curing agent are highly matched with those of E-12 solid epoxy resin, taking into account both ease of construction and post-curing performance. 2-Methylimidazole curing accelerator is a highly efficient catalyst for epoxy systems, mainly solving the problems of construction efficiency and thorough curing.

[0033] Among them, the ultra-high molecular weight epoxy toughening agent is jER1256, the molecular weight of the ultra-high molecular weight epoxy toughening agent is 51000, the epoxy equivalent is 7800g / eq, the water loss resistance improver is HY811, the softening point of the water loss resistance improver is 90~100℃, and the epoxy equivalent is 500~560g / eq.

[0034] The combination of jER1256 ultra-high molecular weight epoxy toughening agent and HY811 water loss resistance enhancer creates a dual effect of "complementary performance + system compatibility". jER1256 ultra-high molecular weight epoxy toughening agent focuses on crack resistance, while HY811 water loss resistance enhancer focuses on water loss resistance. Together, they solve the two major failure risks of epoxy asphalt pavement besides rutting resistance, extending the service life of the pavement. At the same time, the softening point and reactivity of both are matched with the main system (E-12+P5998), which will not disrupt the original preparation process and curing rhythm, ensuring the stability of production and construction.

[0035] Among them, the hard asphalt particles are oxidized asphalt, the softening point of the hard asphalt particles is 100~120℃, the nano silica is fumed silica, the particle size of the nano silica is 10~20nm, and the specific surface area is 200~300m² / g.

[0036] Hard asphalt particles serve as a dispersed phase, providing flexible support and reducing system costs; nano-silica forms a three-dimensional network through physical filling and chemical cross-linking, enhancing high-temperature stability.

[0037] Among them, the antioxidant is antioxidant 1010, the lubricating and isolating agent is AW128 polyethylene micro wax powder, the silane coupling agent is KH-560, and the light stabilizer is UV-531.

[0038] Antioxidants inhibit oxidative degradation during long-term use; lubricating and isolating agents improve processing fluidity and prevent particle agglomeration; silane coupling agents improve the compatibility of epoxy resin and asphalt and enhance interfacial adhesion; and light stabilizers absorb ultraviolet rays and prevent aging and degradation caused by long-term light exposure.

[0039] A method for preparing a rutting-resistant epoxy asphalt toughening additive, the specific steps of which are as follows:

[0040] Step 1: Preliminary Preparation and Raw Material Pretreatment

[0041] Accurately weigh all materials according to the formula, using an electronic balance to ensure accurate measurements: 40 parts solid epoxy resin, 35 parts latent polyester curing agent, 5 parts ultra-high molecular weight epoxy toughening agent, 100 parts hard asphalt granules, 2 parts antioxidant, 5.5 parts silane coupling agent, 6 parts nano silica, 0.1 parts curing accelerator, 0.5 parts light stabilizer, 1 part lubricating and isolating agent, and 20 parts water loss resistance enhancer;

[0042] Add 6 parts of nano silica and 5.5 parts of silane coupling agent to a planetary mixer and stir at 800 rpm for 15 minutes at room temperature to make the silane coupling agent uniformly coat the surface of nano silica, eliminate agglomeration, and improve subsequent dispersibility, thus preparing a "nano silica-coupling agent complex" for later use.

[0043] Step 2: Low-temperature premixing stage

[0044] First, preheat the high-speed mixer to 80-85℃, then add 40 parts of solid epoxy resin and 20 parts of water loss resistance enhancer. Start stirring and stir at 1200 rpm for 3 minutes until the material softens and is initially mixed. Then add other solid components in batches.

[0045] First batch: Add 35 parts of latent polyester curing agent and 5 parts of ultra-high molecular weight epoxy toughening agent. Stir at 1200 rpm for 5 minutes at 80-85℃ in a high-speed mixer to ensure that the resin, curing agent and toughening agent are in full contact.

[0046] Second batch: Add 2 parts antioxidant, 0.5 parts light stabilizer, and 1 part lubricant and release agent, and continue stirring for 3 minutes. The lubricant and release agent is used to prevent the additives from agglomerating, while the antioxidant and light stabilizer are evenly dispersed in the resin system.

[0047] Third batch: Add the pretreated “nano silica-coupling agent complex”, stir for 4 minutes until the mixture is a uniform powder with no obvious particles or agglomerates, stop stirring, and obtain the premixed powder;

[0048] Step 3: Melt blending and addition of curing accelerator

[0049] First, start the twin-screw extruder, then set the temperatures for each section: 110-115℃ for the feeding section, 125-130℃ for the first plasticizing section, 135-140℃ for the first mixing section, 140-145℃ for the second mixing section, and 135-140℃ for the die head. After the temperatures of each section stabilize, maintain no-load operation for 5 minutes. Then, feed the premixed powder into the twin-screw extruder at a uniform speed using the main feeder. After the powder enters the first mixing section, turn on the side feeder and add 100 parts of hard asphalt granules at a uniform speed to ensure that the asphalt and resin system are mixed according to the formula ratio. When the material enters the second mixing section, slowly inject 0.1 parts of curing accelerator using a liquid injection pump to ensure that the accelerator is evenly dispersed in the molten system and to avoid excessively rapid local curing reactions.

[0050] Step 4: Granulation and Finished Product Processing

[0051] The molten material is extruded from the extruder head to form a continuous cylindrical strip, which is immediately cooled in a water cooling tank for 10-15 seconds. After the surface of the strip hardens, it is fed into a pelletizer to be cut into 2-3mm long particles with a particle size controlled between 20-80 mesh. The cut particles are then sent to a hot air dryer for drying. After drying, they are sieved through an 80-mesh screen to ensure particle uniformity, thus obtaining the finished product of the anti-rutting epoxy asphalt toughening additive.

[0052] Pre-treatment eliminates agglomeration of nano-silica, improves dispersibility, and lays the foundation for subsequent mixing; low-temperature premixing with batch feeding and temperature control at 80-85℃ avoids premature reaction of components, prevents additive agglomeration, and achieves uniform dispersion; segmented temperature control during melt blending ensures full integration of asphalt and resin; side feeding and liquid injection pumps add accelerators to ensure accurate proportions and uniform dispersion, avoiding localized solidification; subsequent water-cooled pelletizing, drying, and sieving ensure uniform particle size and stable finished product quality, ultimately contributing to improved performance of rutting-resistant epoxy asphalt toughening additives.

[0053] In step three, the screw speed of the twin-screw extruder is set to 300-350 rpm, and the torque of the twin-screw extruder is controlled at 60%-70%.

[0054] This design applies extremely high shear force at high speeds to achieve ultra-uniform dispersion and efficient reaction of materials. At the same time, by monitoring and stabilizing the torque at the "optimal process window" of 60%-70%, the entire process is ensured to be carried out safely, stably, and continuously within the equipment's capacity. Ultimately, this results in the mass production of epoxy asphalt toughening additives with consistent performance and excellent rutting resistance.

[0055] In step three, the curing accelerator needs to be diluted with a small amount of ethanol to reduce its concentration to 5%.

[0056] This design facilitates uniform injection of the curing accelerator, improves dispersion uniformity, and avoids localized rapid curing.

[0057] In step four, the temperature of the hot air dryer is set to 60-70℃, the wind speed is set to 1.5-2m / s, and the drying time is set to 30 minutes.

[0058] This design removes surface moisture from the anti-rutting epoxy asphalt toughening additive, preventing the finished product from clumping during storage.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rutting-resistant epoxy asphalt toughening additive, characterized in that, The formula comprises the following components in parts by weight: 40 parts solid epoxy resin, 35 parts latent polyester curing agent, 5 parts ultra-high molecular weight epoxy toughening agent, 20 parts water damage resistance enhancer, 100 parts hard asphalt particles, 2 parts antioxidant, 5.5 parts silane coupling agent, 6 parts nano silica, 0.1 parts curing accelerator, 0.5 parts light stabilizer, and 1 part lubricating and isolating agent.

2. The rutting-resistant epoxy asphalt toughening additive according to claim 1, characterized in that: The solid epoxy resin is E-12, with a softening point of 90~93℃ and an epoxy equivalent of 741~847g / eq. The latent polyester curing agent is P5998, with a softening point of 105~115℃ and an acid value of 69~79mgKOH / g. The curing accelerator is 2-methylimidazole.

3. The rutting-resistant epoxy asphalt toughening additive according to claim 1, characterized in that: The ultra-high molecular weight epoxy toughening agent is jER1256, the molecular weight of the ultra-high molecular weight epoxy toughening agent is 51000, and the epoxy equivalent is 7800 g / eq. The water loss resistance enhancer is HY811, the softening point of the water loss resistance enhancer is 90~100℃, and the epoxy equivalent is 500~560 g / eq.

4. The rutting-resistant epoxy asphalt toughening additive according to claim 1, characterized in that: The hard asphalt particles are oxidized asphalt, the softening point of the hard asphalt particles is 100~120℃, the nano silica is fumed silica, the particle size of the nano silica is 10~20nm, and the specific surface area is 200~300m² / g.

5. The rutting-resistant epoxy asphalt toughening additive according to claim 1, characterized in that: The antioxidant is antioxidant 1010, the lubricating and isolating agent is AW128 polyethylene microwax powder, the silane coupling agent is KH-560, and the light stabilizer is UV-531.

6. A method for preparing a rutting-resistant epoxy asphalt toughening additive, characterized in that, The specific steps are as follows: Step 1: Preliminary Preparation and Raw Material Pretreatment Accurately weigh all materials according to the formula, using an electronic balance to ensure accurate measurements: 40 parts solid epoxy resin, 35 parts latent polyester curing agent, 5 parts ultra-high molecular weight epoxy toughening agent, 100 parts hard asphalt granules, 2 parts antioxidant, 5.5 parts silane coupling agent, 6 parts nano silica, 0.1 parts curing accelerator, 0.5 parts light stabilizer, 1 part lubricating and isolating agent, and 20 parts water loss resistance enhancer; Add 6 parts of nano silica and 5.5 parts of silane coupling agent to a planetary mixer and stir at 800 rpm for 15 minutes at room temperature to make the silane coupling agent uniformly coat the surface of nano silica, eliminate agglomeration, and improve subsequent dispersibility, thus preparing a "nano silica-coupling agent complex" for later use. Step 2: Low-temperature premixing stage First, preheat the high-speed mixer to 80-85℃, then add 40 parts of solid epoxy resin and 20 parts of water loss resistance enhancer. Start stirring and stir at 1200 rpm for 3 minutes until the material softens and is initially mixed. Then add other solid components in batches. First batch: Add 35 parts of latent polyester curing agent and 5 parts of ultra-high molecular weight epoxy toughening agent. Stir at 1200 rpm for 5 minutes at 80-85℃ in a high-speed mixer to ensure that the resin, curing agent and toughening agent are in full contact. Second batch: Add 2 parts antioxidant, 0.5 parts light stabilizer, and 1 part lubricant and release agent, and continue stirring for 3 minutes. The lubricant and release agent is used to prevent the additives from agglomerating, while the antioxidant and light stabilizer are evenly dispersed in the resin system. Third batch: Add the pretreated "nano silica-coupling agent complex", stir for 4 minutes until the mixture is a uniform powder with no obvious particles or agglomerates, stop stirring, and obtain the premixed powder; Step 3: Melt blending and addition of curing accelerator First, start the twin-screw extruder, then set the temperatures for each section: 110-115℃ for the feeding section, 125-130℃ for the first plasticizing section, 135-140℃ for the first mixing section, 140-145℃ for the second mixing section, and 135-140℃ for the die head. After the temperatures of each section stabilize, maintain no-load operation for 5 minutes. Then, feed the premixed powder into the twin-screw extruder at a uniform speed using the main feeder. After the powder enters the first mixing section, turn on the side feeder and add 100 parts of hard asphalt granules at a uniform speed to ensure that the asphalt and resin system are mixed according to the formula ratio. When the material enters the second mixing section, slowly inject 0.1 parts of curing accelerator using a liquid injection pump to ensure that the accelerator is evenly dispersed in the molten system and to avoid excessively rapid local curing reactions. Step 4: Granulation and Finished Product Processing The molten material is extruded from the extruder head to form a continuous cylindrical strip, which is immediately cooled in a water cooling tank for 10-15 seconds. After the surface of the strip hardens, it is fed into a pelletizer to be cut into 2-3mm long particles with a particle size controlled between 20-80 mesh. The cut particles are then sent to a hot air dryer for drying. After drying, they are sieved through an 80-mesh screen to ensure particle uniformity, thus obtaining the finished product of the anti-rutting epoxy asphalt toughening additive.

7. The preparation method of the rutting-resistant epoxy asphalt toughening additive according to claim 6, characterized in that: In step three, the screw speed of the twin-screw extruder is set to 300-350 rpm, and the torque of the twin-screw extruder is controlled at 60%-70%.

8. The method for preparing a rutting-resistant epoxy asphalt toughening additive according to claim 6, characterized in that: The curing accelerator mentioned in step three needs to be diluted with a small amount of ethanol, and the concentration of the curing accelerator is diluted to 5%.

9. The method for preparing a rutting-resistant epoxy asphalt toughening additive according to claim 6, characterized in that: In step four, the temperature of the hot air dryer is set to 60-70℃, the wind speed is set to 1.5-2m / s, and the drying time of the hot air dryer is set to 30 minutes.