High-viscosity and high-toughness self-repairing modified asphalt based on dual dynamic cross-linked network structure as well as preparation method and application of high-viscosity and high-toughness self-repairing modified asphalt

Abstract

The invention relates to the technical field of road maintenance, and discloses high-viscosity and high-toughness self-repairing modified asphalt based on a dual dynamic cross-linked network structure, which comprises matrix asphalt, a hydrogen bond and DA cross-linked dual network toughening elastomer, a styrene thermoplastic elastomer, a styrene-isoprene-styrene block copolymer and rubber powder, the weight ratio of the raw materials is (80-100): (3-7): (2-6): (4-7): (8-18); the preparation method comprises the following steps: uniformly mixing the matrix asphalt, the hydrogen bond and DA cross-linked dual-network toughening elastomer, the styrene thermoplastic elastomer, the styrene-isoprene-styrene block copolymer and the rubber powder according to a weight ratio of (80-100): (3-7): (2-6): (4-7): (8-18) to prepare the high-viscosity and high-toughness self-repairing modified asphalt based on the dual dynamic cross-linked network structure. The pavement repairing agent is applied to pavement repairing. According to the technical scheme, the toughness, self-repairing performance and long-term storage stability of the ultrathin overlay asphalt binder can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of road maintenance, and particularly relates to a highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure, and a preparation method and application thereof. Background Technique

[0002] In recent years, China's transportation construction industry has made rapid progress, the highway network has been gradually improved, and the highway construction concept has gradually shifted from "equal emphasis on construction and maintenance" to "mainly maintenance". Pavement preventive maintenance can avoid the further spread of diseases in the initial stage of diseases, extend the service life of the pavement, and ensure the service function of the pavement. Among many preventive maintenance technologies, the ultra-thin overlay technology has been widely used because it can effectively repair diseases such as mild rutting, pavement cracks, and looseness. At the same time, it has the advantages of fast repair speed, low cost, long service life, and the ability to improve the anti-skid performance and wear resistance of the pavement.

[0003] Traditional ultra-thin overlay technologies usually use ordinary asphalt as the binder. Due to the too low viscosity of ordinary asphalt binder, problems such as scattering and dropping particles are likely to occur during use, and the durability is poor.

[0004] Existing ultra-thin overlay technologies usually use high-performance, highly viscous modified asphalt as the binder. For example, Novabinder high-viscosity asphalt used in the United States, EVA polymer-modified high-viscosity asphalt used in France and Spain, and TPS high-viscosity modified asphalt used in Japan. Using the above high-performance, highly viscous modified asphalt as the binder can improve the adhesion and cohesion of asphalt, thereby reducing the risk of asphalt peeling from the aggregate surface. At the same time, the binder will not cause diseases such as dropping particles or scattering due to insufficient cohesion of asphalt. However, due to the unique traffic climate conditions in China, higher requirements are put forward for ultra-thin overlay asphalt binders, and the toughness, self-healing performance and long-term storage stability of existing ultra-thin overlay asphalt binders still need to be further improved. Summary of the Invention

[0005] The present invention aims to provide a highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure, and a preparation method and application thereof, so as to improve the toughness, self-healing performance and long-term storage stability of ultra-thin overlay asphalt binders.

[0006] To achieve the above object, the present invention adopts the following technical scheme: A highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure, including matrix asphalt, a dual-network toughened elastomer cross-linked by hydrogen bonds and DA, a styrene-based thermoplastic elastomer, a styrene-isoprene-styrene block copolymer and rubber powder, and their weight ratios are in turn: (80-100): (3-7): (2-6): (4-7): (8-18).

[0007] Preferably, a method for preparing a hydrogen bond and DA crosslinked double network toughened elastomer includes the following steps: S1. Synthesize hydrogen bond monomers; S2. Synthesize linear copolymers; S3. Synthesize a hydrogen bond and DA crosslinked double network toughened elastomer.

[0008] Preferably, the synthesis of hydrogen bond monomers in S1 includes the following steps: S1.1. Measure a certain amount of hydroxyl group-containing organic matter and ester compound respectively, mix the two evenly, place them in an ice bath atmosphere, add a catalyst, and stir. React for 5 - 6 h, wherein the volume ratio of the hydroxyl group-containing organic matter, ester compound and catalyst is 100:(100 - 180):(13.2 - 44); S1.2. After the reaction, wash the reaction product with a first organic solvent 3 - 4 times, then place the reaction product in a vacuum box and dry it to constant weight at 30℃ - 60℃ to obtain hydrogen bond monomers.

[0009] Preferably, the synthesis of linear copolymers in S2 includes the following steps: S2.1. Weigh butyl acrylate, furfuryl methacrylate and the hydrogen bond monomers prepared in S1 according to a molar ratio of (70 - 95):(2 - 5):(8 - 15), place them in a three-necked flask equipped with a stir bar, then measure 40 - 200 mL of a second organic solvent and place it in the three-necked flask. Connect the three-necked flask to a spherical condenser, cool with condensed water, bubble for 20 - 30 min under an inert atmosphere, and then react at 70℃ - 90℃ for 6 - 7 h; S2.2. After the reaction is completed, put the reaction product into a non-polar solvent and precipitate it 3 - 4 times, then place the reaction product in a vacuum box and dry it to constant weight at 60℃ - 90℃ to obtain linear copolymers.

[0010] Preferably, the synthesis of a hydrogen bond and DA crosslinked double network toughened elastomer in S3 includes the following steps: S3.1. Weigh a certain amount of the linear copolymer prepared in S2 and dissolve it in 100 - 300 ml of a third organic solvent; S3.2. Weigh a certain amount of the hydrogen bond monomers and bismaleimide prepared in S1 respectively, dissolve them in 50 - 250 mL of a third organic solvent, and the weight ratio of the linear copolymer prepared in S2 to the hydrogen bond monomers and bismaleimide prepared in S1 is 100:(40 - 90):(30 - 50); S3.3. Mix the solution in S3.1 with the solution in S3.2 evenly, pour the evenly mixed solution into a tetrafluoro mold, and react at 60 °C - 70 °C for 3 - 4 days. After the solvent evaporates, a double-network toughened elastomer crosslinked by hydrogen bonds and DA is prepared.

[0011] Preferably, the preparation method of the catalyst in S1.1 is: dissolve 2 mL of dibutyltin dilaurate in 145 mL of tetrahydrofuran solvent.

[0012] Preferably, the hydroxy-containing organic compound in S1.1 is any one of p-methoxyphenol, p-hydroxybenzoate, N-(3-hydroxypropyl)acrylamide, N-hydroxy-3-(3-phenylaminosulfonylphenyl)acrylamide, N-hydroxymethylacrylamide, 4-hydroxy diphenyl ether, hydroquinone dihydroxyethyl ether, N-(2-hydroxyethyl)acrylamide; the ester compound is any one of n-butyl isocyanate, butyl acrylate, butyl methacrylate, furfuryl methacrylate, methyl 2-methylacrylate.

[0013] Preferably, the preparation method of the second organic solvent in S2.1 is: dissolve 3 - 10 g of azobisisobutyronitrile in 400 mL of ethyl acetate.

[0014] The present invention also provides another technical solution, a preparation method of a highly viscous and highly tough self-healing modified asphalt based on a double dynamic crosslinked network structure. Mix matrix asphalt, a double-network toughened elastomer crosslinked by hydrogen bonds and DA, a styrene-based thermoplastic elastomer, a styrene-isoprene-styrene block copolymer, and rubber powder in a weight ratio of (80 - 100):(3 - 7):(2 - 6):(4 - 7):(8 - 18) evenly, and a highly viscous and highly tough self-healing modified asphalt based on a double dynamic crosslinked network structure can be prepared.

[0015] The present invention also provides another technical solution, an application of a highly viscous and highly tough self-healing modified asphalt based on a double dynamic crosslinked network structure. Use the prepared highly viscous and highly tough self-healing modified asphalt based on a double dynamic crosslinked network structure for the repair of road surfaces.

[0016] Compared with the prior art, the beneficial effects of this solution are: (1) Use a double-network toughened elastomer crosslinked by both hydrogen bonds and DA bonds to prepare an ultra-thin wearing course asphalt binder. On the one hand, utilize the characteristic that the hydrogen bond crosslinked network dissipates energy when broken under external force to improve the toughness and mechanical strength of the asphalt binder; on the other hand, the high-strength DA bonds help the asphalt binder to quickly recover its shape after deformation, ensuring elasticity and long-term stability; in addition, the hydrogen bonds and DA bonds can break and recombine at a certain temperature, endowing the ultra-thin wearing course asphalt binder with self-healing ability.

[0017] (2)Toughen the asphalt binder with an elastomer having a dual dynamic cross-linked network structure. By introducing highly elastic and tough components, the adhesion and cohesion of the wearing course asphalt binder are improved, and the risk of peeling, chipping, or scattering of the wearing course asphalt binder can be reduced. Detailed implementation manners

[0018] The following is a further detailed description through specific implementation manners: Example 1 A highly viscous and tough self-healing modified asphalt based on a dual dynamic cross-linked network structure, including matrix asphalt, a dual network toughening elastomer cross-linked by hydrogen bonds and DA, a styrene-based thermoplastic elastomer, a styrene-isoprene-styrene block copolymer, and rubber powder, and their weight ratios are in sequence: (80 - 100):(3 - 7):(2 - 6):(4 - 7):(8 - 18). In this example, the weight ratios of matrix asphalt, the dual network toughening elastomer cross-linked by hydrogen bonds and DA, the styrene-based thermoplastic elastomer, the styrene-isoprene-styrene block copolymer, and rubber powder are in sequence: 80:7:2:4:8.

[0019] Among them, the styrene-based thermoplastic elastomer is abbreviated as SBS, and the manufacturer is: Shanghai Secco Petrochemical Co., Ltd.; The styrene-isoprene-styrene block copolymer is abbreviated as SIS, and the manufacturer is: Yanshan Petrochemical; Both the matrix asphalt and the rubber powder can be commercially available products.

[0020] The preparation of the dual network toughening elastomer cross-linked by hydrogen bonds and DA includes the following steps: S1, synthesize the hydrogen bond monomer; S1.1, Measure a certain amount of hydroxyl-containing organic compounds and ester compounds respectively, and place them in a eggplant-shaped flask. Stir until the two are evenly mixed. Place the eggplant-shaped flask in an ice bath atmosphere, then add a catalyst to the eggplant-shaped flask and stir. React for 5 - 6 h. Among them, the volume ratio of the hydroxyl-containing organic compound, the ester compound and the catalyst is 100:(100 - 180):(13.2 - 44) in sequence. The hydroxyl-containing organic compound is any one of p-methoxyphenol, p-hydroxybenzoate, N-(3-hydroxypropyl)acrylamide, N-hydroxy-3-(3-phenylsulfamoylphenyl)acrylamide, N-hydroxymethylacrylamide, 4-hydroxydiphenyl ether, hydroquinone dihydroxyethyl ether, N-(2-hydroxyethyl)acrylamide; the ester compound is any one of n-butyl isocyanate, butyl acrylate, butyl methacrylate, furfuryl methacrylate, methyl methacrylate. The preparation method of the catalyst is: dissolve 2 mL of dibutyltin dilaurate in 20 mL of tetrahydrofuran solvent; in this example, the hydroxyl-containing organic compound is selected as N-(2-hydroxyethyl)acrylamide, and its manufacturer is Shanghai Aladdin; the ester compound is selected as n-butyl isocyanate, and its manufacturer is Shanghai Macklin; the reaction time is 5 h, the dosage of the hydroxyl-containing organic compound is 100 mL, the dosage of the ester compound is 150 mL, and the dosage of the catalyst is 20 mL. It should be noted that the ice bath atmosphere refers to an ice-water mixture at 0 °C; S1.2, After the reaction is completed, wash the reaction product with a first organic solvent 3 - 4 times, and then place the reaction product in a vacuum box and dry it to constant weight at 30 °C - 60 °C to obtain a hydrogen bond monomer. Among them, the first organic solvent is any one of dimethylacetamide, n-hexane, diethyl ether, tetrahydrofuran. In this example, the first organic solvent is selected as tetrahydrofuran solvent, the washing times is 3 times, and the drying temperature is 30 °C. If the temperature is higher than 60 °C, the generated hydrogen bond monomer is easily degraded. If the temperature is lower than 30 °C, the drying purpose cannot be achieved.

[0021] S2, Synthesize linear copolymer; S2.1, Weigh butyl acrylate, furfuryl methacrylate and the hydrogen bond monomer prepared in S1 according to the molar ratio of (70 - 95):(2 - 5):(8 - 15), and place them in a three-necked flask equipped with a magnetic stirrer. Then measure 40 - 200 mL of the second organic solvent and add it to the three-necked flask. Connect the three-necked flask to a spherical condenser, cool it with condensed water, and under an inert atmosphere, bubble for 20 - 30 min to remove the oxygen in the solution. Then react at 70°C - 90°C for 6 - 7 h. Among them, the preparation method of the second organic solvent is: dissolve 3 - 10 g of azobisisobutyronitrile in 400 mL of ethyl acetate, and the inert atmosphere is any one of argon and nitrogen; in this example, the amount of butyl acrylate used is 223 g, the amount of furfuryl methacrylate used is 10 g, and the amount of the urethane prepared in S1 used is 42.9 g, that is, the molar ratio of butyl acrylate, furfuryl methacrylate and the urethane prepared in S1 is 87:3:10 in sequence. The preparation method of the second organic solvent is: dissolve 3 g of azobisisobutyronitrile in 400 mL of ethyl acetate, the amount of the second organic solvent used is 160 mL, the bubbling time is 20 min, the reaction temperature is 70°C, and the reaction time is 6 h. The manufacturer of butyl acrylate is Shanghai Aladdin, the manufacturer of furfuryl methacrylate is Shanghai Macklin, and the manufacturer of azobisisobutyronitrile is Shanghai Aladdin. S2.2, After the reaction is completed, put the reaction product into a non-polar solvent and precipitate 3 - 4 times. Then place the reaction product in a vacuum oven and dry it to a constant weight at 60°C - 90°C to obtain a linear copolymer. Among them, the non-polar solvent is any one of petroleum ether and n-hexane. In this example, the number of precipitation times is 3 times, the drying temperature is 60°C, and the non-polar solvent selected is petroleum ether. S3, Synthesize a double-network toughened elastomer with hydrogen bonds and DA crosslinking. S3.1, Weigh a certain amount of the linear copolymer prepared in S2 and dissolve it in 100 - 300 ml of the third organic solvent. Among them, the third organic solvent is any one of tetrahydrofuran, dimethylacetamide, and dimethylformamide. In this example, the third organic solvent is tetrahydrofuran, and the amount of the third organic solvent used is 130 mL. S3.2, Weigh a certain amount of the hydrogen-bond monomer and bismaleimide prepared in S1 respectively, and dissolve them in 50 - 250 mL of the third organic solvent. The weight ratio of the linear copolymer prepared in S2 to the hydrogen-bond monomer and bismaleimide prepared in S1 is 100:(40 - 90):(30 - 50). Among them, the third organic solvent is any one of tetrahydrofuran, dimethylacetamide, and dimethylformamide. In this example, the third organic solvent is tetrahydrofuran, and the dosage of the third organic solvent is 160 mL; the dosage of the linear copolymer prepared in S2 is 40 g, the hydrogen-bond monomer prepared in S1 is 36 g, and the dosage of bismaleimide is 20 g, that is, the weight ratio of the linear copolymer prepared in S2 to the hydrogen-bond monomer and bismaleimide prepared in S1 is 10:9:5; S3.3, Mix the solution in S3.1 and the solution in S3.2 evenly, and pour the evenly mixed solution into a square tetrafluoro mold. React at 60℃ - 70℃ for 3 - 4 days. After the solvent evaporates, a double-network toughened elastomer crosslinked by hydrogen bonds and DA is prepared. In this example, the reaction temperature is 60℃ and the reaction time is 3 days. Since the tetrafluoro mold has the advantages of a smooth surface and a small friction coefficient, using a tetrafluoro mold is beneficial for product demolding, reduces damage to the product surface, the material is not easily adhered to the mold surface, and is convenient for cleaning and reuse.

[0022] The preparation method of the highly viscous, highly tough and self-healing modified asphalt based on a double dynamic crosslinked network structure is as follows: Mix matrix asphalt, the double-network toughened elastomer crosslinked by hydrogen bonds and DA, styrene-based thermoplastic elastomer, styrene-isoprene-styrene block copolymer and rubber powder evenly according to a weight ratio of (80 - 100):(3 - 7):(2 - 6):(4 - 7):(8 - 18), and then the highly viscous, highly tough and self-healing modified asphalt based on a double dynamic crosslinked network structure can be prepared. In this example, matrix asphalt, the double-network toughened elastomer crosslinked by hydrogen bonds and DA, styrene-based thermoplastic elastomer, styrene-isoprene-styrene block copolymer and rubber powder are mixed evenly according to a weight ratio of 80:7:2:4:8.

[0023] Detect the toughness, self-healing performance and long-term storage stability of the prepared highly viscous, highly tough and self-healing modified asphalt based on a double dynamic crosslinked network structure, and the detection results are shown in Table 1.

[0024] Application of the highly viscous, highly tough and self-healing modified asphalt based on a double dynamic crosslinked network structure: Use the prepared highly viscous, highly tough and self-healing modified asphalt based on a double dynamic crosslinked network structure for road surface repair.

[0025] Example 2 Different from Example 1, in the highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure, the weight ratio of matrix asphalt, dual network toughening elastomer cross-linked by hydrogen bonds and DA, styrene-based thermoplastic elastomer, styrene-isoprene-styrene block copolymer, and rubber powder is 90:5:4:5:15.

[0026] In the preparation method of the highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure, mix matrix asphalt, dual network toughening elastomer cross-linked by hydrogen bonds and DA, styrene-based thermoplastic elastomer, styrene-isoprene-styrene block copolymer, and rubber powder evenly according to the weight ratio of 90:5:4:5:15. Detect the toughness, self-healing performance and long-term storage stability of the prepared highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure, and the test results are shown in Table 1.

[0027] Example 3 Different from Example 1, in the highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure, the weight ratio of matrix asphalt, dual network toughening elastomer cross-linked by hydrogen bonds and DA, styrene-based thermoplastic elastomer, styrene-isoprene-styrene block copolymer, and rubber powder is 100:3:6:7:18.

[0028] In the preparation method of the highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure, mix matrix asphalt, dual network toughening elastomer cross-linked by hydrogen bonds and DA, styrene-based thermoplastic elastomer, styrene-isoprene-styrene block copolymer, and rubber powder evenly according to the weight ratio of 100:3:6:7:18. Detect the toughness, self-healing performance and long-term storage stability of the prepared highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure, and the test results are shown in Table 1.

[0029] Comparative Example 1 Different from Example 1, in the highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure, the DA cross-linked dual network toughening elastomer is not contained, that is, the weight ratio of matrix asphalt, styrene-based thermoplastic elastomer, styrene-isoprene-styrene block copolymer, and rubber powder is successively: 80:2:4:8.

[0030] In the preparation method of the highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure, mix matrix asphalt, styrene-based thermoplastic elastomer, styrene-isoprene-styrene block copolymer, and rubber powder evenly according to the weight ratio of 87:2:4:8. Detect the toughness, self-healing performance and long-term storage stability of the prepared highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure, and the test results are shown in Table 1.

[0031] Comparative Example 2 Different from Example 1: In the highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure, the weight ratios of matrix asphalt, the dual network toughening elastomer cross-linked by hydrogen bonds and DA, styrene-based thermoplastic elastomer, styrene-isoprene-styrene block copolymer, and rubber powder are successively: 80:2:2:4:8.

[0032] In the preparation method of the highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure, matrix asphalt, the dual network toughening elastomer cross-linked by hydrogen bonds and DA, styrene-based thermoplastic elastomer, styrene-isoprene-styrene block copolymer, and rubber powder are mixed evenly according to a weight ratio of 80:2:2:4:8. The toughness, self-healing performance, and long-term storage stability of the prepared highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure are detected, and the detection results are shown in Table 1.

[0033] Comparative Example 3 Different from Example 1: Different from Example 1: In the highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure, the weight ratios of matrix asphalt, the dual network toughening elastomer cross-linked by hydrogen bonds and DA, styrene-based thermoplastic elastomer, styrene-isoprene-styrene block copolymer, and rubber powder are successively: 80:9:2:4:8.

[0034] In the preparation method of the highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure, matrix asphalt, the dual network toughening elastomer cross-linked by hydrogen bonds and DA, styrene-based thermoplastic elastomer, styrene-isoprene-styrene block copolymer, and rubber powder are mixed evenly according to a weight ratio of 80:9:2:4:8. The toughness, self-healing performance, and long-term storage stability of the prepared highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure are detected, and the detection results are shown in Table 1.

[0035] Table 1 shows the detection results of the toughness, self-healing performance, and long-term storage stability of the highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure prepared in Examples 1-3 and Comparative Examples 1-3.

[0036] Table 1

[0037] Conclusion: The difference between Example 1 and Comparative Example 1 is that Comparative Example 1 does not contain the dual network toughening elastomer cross-linked by hydrogen bonds and DA. As can be seen from Table 1, the modified asphalt prepared in Comparative Example 1 shows phenomena such as peeling, chipping, and scattering, and the toughness, self-healing rate, and long-term storage stability of Comparative Example 1 are all poor.

[0038] The difference between Example 1 and Comparative Example 2 lies in that: in Comparative Example 2, the content of the double-network toughened elastomer with hydrogen bonds and DA crosslinking is too small, which has an adverse effect on the toughness of the prepared modified asphalt.

[0039] The difference between Example 1 and Comparative Example 3 lies in that: in Comparative Example 3, the content of the double-network toughened elastomer with hydrogen bonds and DA crosslinking is too large, which also has an adverse effect on the toughness of the prepared modified asphalt.

[0040] The above are only the embodiments of the present invention, and specific technical solutions and / or common knowledge such as characteristics well known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A highly viscous and tough self-healing modified asphalt based on a dual dynamic cross-linked network structure, characterized in that: It includes matrix asphalt, a dual-network toughened elastomer with hydrogen bonds and DA crosslinking, a styrene-based thermoplastic elastomer, a styrene-isoprene-styrene block copolymer, and rubber powder, and their weight ratios are in turn: (80 - 100) : (3 - 7) : (2 - 6) : (4 - 7) : (8 - 18).

2. The highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure according to claim 1, wherein: The preparation method of the dual-network toughened elastomer with hydrogen bonds and DA crosslinking includes the following steps: S1, synthesize hydrogen bond monomers; S2, synthesize linear copolymers; S3, synthesize the dual-network toughened elastomer with hydrogen bonds and DA crosslinking.

3. The highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure according to claim 2, wherein: The synthesis of hydrogen bond monomers in S1 includes the following steps: S1.1, respectively measure a certain amount of hydroxyl-containing organic compounds and ester compounds, mix the two evenly, place them in an ice bath atmosphere, then add a catalyst, and stir. React for 5 - 6 h, where the volume ratios of the hydroxyl-containing organic compounds, ester compounds, and catalyst are in turn 100 : (100 - 180) : (13.2 - 44); S1.2, after the reaction is completed, wash the reaction product with the first organic solvent 3 - 4 times, then place the reaction product in a vacuum box, and dry it to constant weight at 30℃ - 60℃ to obtain hydrogen bond monomers.

4. The highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure according to claim 3, wherein: The synthesis of linear copolymers in S2 includes the following steps: S2.1, respectively weigh butyl acrylate, furfuryl methacrylate, and the hydrogen bond monomers prepared in S1 according to a molar ratio of (70 - 95) : (2 - 5) : (8 - 15), and place them in a three-necked flask equipped with a magnetic stirrer. Then measure 40 - 200 mL of the second organic solvent and place it in the three-necked flask. Connect the three-necked flask to a spherical condenser, connect the cooling water for cooling, bubble for 20 - 30 min under an inert atmosphere, and then react at 70℃ - 90℃ for 6 - 7 h; S2.2, after the reaction is completed, put the reaction product into a non-polar solvent and precipitate it 3 - 4 times. Then place the reaction product in a vacuum box and dry it to constant weight at 60℃ - 90℃ to obtain linear copolymers.

5. The highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure according to claim 4, characterized in that: The synthesis of the dual-network toughened elastomer with hydrogen bonds and DA crosslinking in S3 includes the following steps: S3.1, weigh a certain amount of the linear copolymers prepared in S2 and dissolve them in 100 - 300 ml of the third organic solvent; S3.2, respectively weigh a certain amount of the hydrogen bond monomers and bismaleimide prepared in S1 and dissolve them in 50 - 250 mL of the third organic solvent, and the weight ratio of the linear copolymers prepared in S2 to the hydrogen bond monomers and bismaleimide prepared in S1 is 100 : (40 - 90) : (30 - 50); S3.3, mix the solution in S3.1 with the solution in S3.2 evenly, pour the evenly mixed solution into a tetrafluoro mold, and react at 60℃ - 70℃ for 3 - 4 days. After the solvent evaporates, obtain the dual-network toughened elastomer with hydrogen bonds and DA crosslinking.

6. The highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure according to claim 5, characterized in that: The preparation method of the catalyst in S1.1 is: dissolve 2 mL of dibutyltin dilaurate in 20 mL of tetrahydrofuran solvent.

7. The highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure according to claim 6, characterized in that: The hydroxyl-containing organic compound in S1.1 is any one of p-methoxyphenol, p-hydroxybenzoate, N-(3-hydroxypropyl)acrylamide, N-hydroxy-3-(3-phenylaminosulfonylphenyl)acrylamide, N-hydroxymethylacrylamide, 4-hydroxydiphenyl ether, di(2-hydroxyethyl)hydroquinone, N-(2-hydroxyethyl)acrylamide; the ester compound is any one of n-butyl isocyanate, butyl acrylate, butyl methacrylate, furfuryl methacrylate, methyl methacrylate.

8. The highly viscous, highly tough and self-healing modified asphalt based on a dual dynamic cross-linked network structure according to claim 7, characterized in that: The preparation method of the second organic solvent in S2.1 is: dissolving 3-10 g of azobisisobutyronitrile in 400 mL of ethyl acetate.

9. Preparation method of highly viscous and tough self-healing modified asphalt based on dual dynamic cross-linked network structure, characterized in that: Mix matrix asphalt, hydrogen bond and DA cross-linked double network toughened elastomer, styrene-based thermoplastic elastomer, styrene-isoprene-styrene block copolymer and rubber powder evenly according to the weight ratio of (80-100):(3-7):(2-6):(4-7):(8-18), and the highly viscous, highly tough and self-healing modified asphalt based on the double dynamic cross-linked network structure can be prepared.

10. Application of a highly viscous and tough self-healing modified asphalt based on a dual dynamic cross-linked network structure, characterized in that: Use the prepared highly viscous, highly tough and self-healing modified asphalt based on the double dynamic cross-linked network structure for the repair of road surfaces.

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