Modified asphalt and preparation method thereof
By synergistically reacting geopolymer precursor solutions with epoxy compounds in a mercaptosilane bridging system, an organic-inorganic hybrid interpenetrating network is constructed, which solves the problems of poor compatibility and weak interfacial bonding of modified asphalt, and improves high-temperature stability, low-temperature crack resistance and durability, making it suitable for road engineering materials.
Patent Information
- Application Number
- CN202511907071.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-17
- Publication Date
- 2026-02-03
AI Technical Summary
Existing modified asphalt technologies often sacrifice low-temperature performance when improving high-temperature stability, or the components cannot work synergistically due to insufficient interfacial compatibility, making it difficult to build a stable organic-inorganic hybrid network, resulting in unbalanced performance of pavement materials under complex working conditions.
A stable organic-inorganic hybrid interpenetrating network structure is constructed by synergistic reaction of geopolymer precursor solution, epoxidized natural rubber, epoxidized soybean oil and mercaptosilane coupling agent under the action of catalyst. A strong chemical bridge is formed through mercapto-epoxy click chemical reaction. The viscosity of the system is adjusted by wax modifier to form a modified asphalt with both rigidity and flexibility.
This technology improves the high-temperature stability, low-temperature crack resistance, interfacial bonding strength, and durability of modified asphalt, while maintaining good workability, thus solving the technical bottlenecks of traditional modified asphalt in terms of compatibility and durability.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of road engineering materials, in particular to a modified asphalt material and a preparation method thereof. BACKGROUND
[0002] With the rapid development of modern transportation infrastructure, road engineering puts forward higher requirements for the performance of asphalt materials. Traditional base asphalt has inherent defects such as easy softening at high temperature and easy brittle cracking at low temperature, and has gradually failed to meet the use requirements under complex working conditions. Therefore, modified asphalt technology emerges as the times require, among which the process route represented by elastomer blending modification has become the mainstream scheme. However, such modification methods mostly rely on the principle of physical blending, and organic components such as thermoplastic elastomers or recycled rubber are directly added into the asphalt system. Although such materials can significantly improve the ductility and flexibility of asphalt in the short term, there are still obvious limitations in long-term performance: on the one hand, the compatibility of elastomer and asphalt matrix is poor, which leads to insufficient interfacial bonding force and easy peeling failure under repeated load; on the other hand, organic elastomer is easy to oxidize and degrade and the flow performance is poor in high temperature environment, which significantly increases the risk of rutting deformation and other diseases of pavement materials.
[0003] In order to further optimize the comprehensive performance of asphalt, the industry has begun to try to introduce bio-based materials for modification. For example, natural rubber or soybean oil derivatives have attracted widespread attention due to their renewable properties. However, the polarity difference between such materials and asphalt is large, and simple physical mixing is difficult to form a stable interaction network, which limits its enhancement effect. In addition, the traditional modification process usually lacks a targeted chemical bonding mechanism design, so that the modified agent and the asphalt matrix are only sustained by van der Waals force, which is difficult to resist the double challenges of water erosion and long-term environmental stress.
[0004] In summary, the existing modification technology system is often difficult to balance other key indicators when improving a certain performance of asphalt, especially when improving high temperature stability, the low temperature performance is often sacrificed, or the components cannot work together due to the lack of interfacial compatibility. This performance imbalance problem seriously restricts the actual engineering application effect of modified asphalt. Therefore, developing a new modification system that can break through the limitations of traditional physical blending, realize the synergistic enhancement of organic and inorganic components, and construct an asphalt material with excellent high temperature stability, firm interfacial bonding force and long-term durability has become a technical problem to be solved in the field. SUMMARY
[0005] The purpose of the present application is to overcome the shortcomings of the prior art and provide a modified asphalt and a preparation method thereof.
[0006] In a first aspect, the application provides a modified asphalt, comprising the following components: road asphalt, geopolymer precursor solution, star-shaped SBS modifier, epoxidized natural rubber, epoxy soybean oil, mercapto silane coupling agent, dibutyl tin dilaurate, hydrogenated petroleum resin, nano organic montmorillonite, wax regulator, light stabilizer and antioxidant.
[0007] By adopting the above technical scheme, through the synergistic reaction of the geopolymer precursor solution, the epoxidized natural rubber, the epoxy soybean oil and the mercapto silane coupling agent under the action of the catalyst, a stable organic-inorganic hybrid interpenetrating network structure can be constructed in the asphalt system, effectively solving the technical bottleneck of poor compatibility between the geopolymer and the organic phase of the asphalt, and the mercapto silane coupling agent can have a high-efficiency “mercapto-epoxy” click chemistry reaction with the epoxy groups in the epoxidized natural rubber and the epoxy soybean oil to form a firm chemical bridge; thereby simultaneously improving the high-temperature stability, the low-temperature crack resistance, the interface bonding strength and the durability of the modified asphalt.
[0008] Optionally, the wax regulator comprises Fischer-Tropsch wax and polyethylene wax.
[0009] By adopting the above technical scheme, the Fischer-Tropsch wax and the polyethylene wax are used in combination, which can synergistically regulate the viscosity of the system, improve the workability and enhance the rigidity after solidification.
[0010] Optionally, the components comprise, by weight: 60-80 parts of road asphalt; 5-12 parts of geopolymer precursor solution; 1-5 parts of star-shaped SBS modifier; 0.5-3 parts of epoxidized natural rubber; 1-3 parts of epoxy soybean oil; 0.2-0.6 parts of mercapto silane coupling agent; 0.01-0.05 parts of dibutyl tin dilaurate; 0.5-2 parts of hydrogenated petroleum resin; 1-2 parts of nano organic montmorillonite; 0.3-1 parts of Fischer-Tropsch wax; 0.3-1 parts of polyethylene wax; 0.05-0.2 parts of light stabilizer; and 0.02-0.1 parts of antioxidant.
[0011] Optionally, the weight of the star-shaped SBS modifier is 3 parts.
[0012] Optionally, the weight of the geopolymer precursor solution is 8 parts.
[0013] Optionally, the weight of the epoxidized natural rubber is 1.5 parts, and the weight of the epoxy soybean oil is 2 parts.
[0014] By adopting the technical scheme, the star-shaped SBS modifier can form an optimal three-dimensional elastic network in the asphalt, providing excellent toughness and elastic recovery capability for the material, and realizing a rigid-flexible combined synergistic reinforcing effect with the rigid network constructed by the geopolymer. The geopolymer precursor solution is a key point for realizing volume balance and optimal performance matching of the organic phase and the inorganic phase, so that the modified asphalt has excellent high-temperature stability and acceptable low-temperature deformation capability. The epoxidized natural rubber is a key component with both elasticity and reactivity, and the epoxy groups thereof can participate in the construction of the interface chemical bond; the epoxidized soybean oil is both a compatibilizer and a reactive plasticizer, and the specific proportion of the two is a guarantee for realizing efficient bridging of the organic-inorganic two phases and obtaining excellent comprehensive performance.
[0015] Optionally, the geopolymer precursor solution comprises the following components: sodium silicate solution, calcined kaolin, sodium hydroxide, alkaline silica sol, amino silane coupling agent and deionized water.
[0016] Optionally, the geopolymer precursor solution comprises, by weight, 50-70 parts of sodium silicate solution, 10-20 parts of calcined kaolin, 4-8 parts of sodium hydroxide, 5-15 parts of alkaline silica sol, 0.3-0.5 parts of amino silane coupling agent and 5-10 parts of deionized water.
[0017] By adopting the technical scheme, the geopolymer precursor solution prepared by the specific formula and process has high reactivity and good stability, and when the inorganic silicon-aluminum network structure is subsequently compounded with the organic phase, the inorganic silicon-aluminum network structure can be effectively grafted by the coupling agent to become a rigid support skeleton of the hybrid network.
[0018] Optionally, the geopolymer precursor solution is prepared by the following method: The sodium hydroxide is dissolved in the deionized water to prepare a concentrated alkali solution by stirring; The alkaline silica sol is slowly added to the concentrated alkali solution under the condition of 30-50 DEG C, and the mixture is kept warm and stirred to obtain a composite alkaline activator; The calcined kaolin is added to the sodium silicate solution under the condition of 50-70 DEG C and stirring, and the mixture is continuously stirred and aged to obtain a silicon-aluminum source matrix; The silicon-aluminum source matrix is cooled to 45-55 DEG C, and the composite alkaline activator and the amino silane coupling agent are added, and the mixture is continuously reacted at 45-55 DEG C for 0.5-1.5 hours, and after discharging, the mixture is sealed and aged for 20-28 hours to obtain the geopolymer precursor solution.
[0019] By adopting the technical scheme, the preparation method ensures the homogenization and functional modification of the geopolymer precursor solution, and the amino silane coupling agent added in advance can pre-modify the inorganic phase, greatly improving the interfacial compatibility and reaction efficiency of the inorganic phase with the subsequent organic components.
[0020] In a second aspect, the application provides a modified asphalt as described in the first aspect, which is prepared by the following method: heating the road asphalt to 155-165°C, adding the hydrogenated petroleum resin and the star-shaped SBS modifier, high-speed shearing at a speed of 3500-4500 rpm for 0.8-1.2 hours, then adding the epoxidized natural rubber, continuing to shear at a speed of 2500-3500 rpm for 20-40 minutes to form an organic elastomer masterbatch; mixing and stirring the geopolymer precursor solution, the epoxidized soybean oil, part of the mercapto silane coupling agent, and the dibutyl tin dilaurate at 60-70°C and a stirring speed of 400-600 rpm for 30-50 minutes to obtain a geopolymer hybrid pre-reaction solution; adding the geopolymer hybrid pre-reaction solution to the organic elastomer masterbatch, adding the remaining mercapto silane coupling agent, and adding the nano-organic montmorillonite, the Fischer-Tropsch wax, and the polyethylene wax after high-speed shearing at 145-155°C and a speed of 3000-4000 rpm for 0.8-1.2 hours, adjusting the shearing speed to 2000-3000 rpm, and continuing to shear for 20-40 minutes to obtain a primary product; cooling the primary product to 135-145°C, adding the light stabilizer and the antioxidant, stirring at a speed of 500-1000 rpm for 20-40 minutes, and then statically developing at 155-165°C for 80-100 minutes to obtain the modified asphalt.
[0021] By using the above technical solution, the preparation method adopts a process route of "step-by-step pre-reaction-high-speed shearing compounding-static development". First, an organic elastomer masterbatch and a geopolymer hybrid pre-reaction solution are prepared respectively to ensure that the components are fully dispersed and pre-activated; then, forced mixing and interfacial reaction of the two phases are realized under high-speed shearing; finally, the hybrid network structure is perfected and stabilized through static development. The method has a reasonable process design and strong operability, and is the key to realizing the industrialization of the high-performance modified asphalt of the application.
[0022] In summary, the application includes at least one of the following beneficial technical effects: 1. By the synergistic effect of the geopolymer precursor solution and the bio-based epoxidized compound under the mercapto silane bridging system, a stable organic-inorganic hybrid interpenetrating network is successfully constructed, solving the core technical problem of poor compatibility and weak interfacial bonding in traditional physical blending modification; 2. The obtained modified asphalt material realizes a balance of high performance, with excellent high-temperature stability, strong interfacial bonding force, excellent water damage resistance, and good low-temperature toughness, while maintaining ideal construction and workability and storage stability; 3. The preparation method of the present application has a clear process route. Through step-by-step pre-reaction and precise process parameter control, the high-efficiency compounding of a complex multi-component system and the full formation of a hybrid network are ensured, the product performance is stable and reliable, and the product has a significant industrial application prospect. DETAILED DESCRIPTION
[0023] The present application is further described below in combination with preparation examples and examples.
[0024] The raw materials used in the preparation examples and examples are all commercially available products. Among them: sodium silicate solution is purchased from Weifang Zhengcan New Material Co., Ltd., model ZCXCL-4; calcined kaolin is purchased from Guangzhou Zhanfei Chemical Technology Co., Ltd., particle size not less than 800 mesh; the cargo number of alkaline silica sol is WLJ-10040; the star-shaped SBS modifier requires a styrene / butadiene block ratio of 30 / 70, and the melt flow rate is not less than 1 g / 10 min; the epoxidized natural rubber has an epoxidation degree of 25; the epoxidized soybean oil has an epoxy value of 6.3; the amino silane coupling agent is KH-550 type, the mercapto silane coupling agent is KH-570 type; the hydrogenated petroleum resin requires an acid value not more than 1 mg KOH / g, and a softening point of 110±5℃; the nano-organic montmorillonite needs to be modified by cetyltrimethylammonium bromide, and the interlayer spacing is not less than 2.5 nm; the type of Fischer-Tropsch wax is YT-90, and the penetration is 15 mm; the type of polyethylene wax is C-816, and the acid value is not more than 4 mg KOH / g; the type of light stabilizer is UV-326; the type of antioxidant is 1010; the remaining raw materials are also conventional commercially available products in the art.
[0025] Preparation example Geopolymer precursor solution The components include the following substances: sodium silicate solution, calcined kaolin (industrial grade), sodium hydroxide (flaky, analytical pure), alkaline silica sol, amino silane coupling agent, deionized water.
[0026] Preparation method: Preparation of modified alkaline activator: 6 parts of sodium hydroxide are dissolved in 8 parts of deionized water, stirred until clear, and a concentrated lye is prepared; 10 parts of alkaline silica solvent are slowly added to the concentrated lye under constant stirring at 40℃; after the addition is completed, continue to stir at 40℃ for 30 minutes, and a silica sol modified composite alkaline activator is obtained.
[0027] Preparation of silicon aluminum source matrix: 15 parts of calcined kaolin are slowly added to 60 parts of sodium silicate solution at 60℃ with a speed of 300 rpm, the speed is adjusted to 500 rpm, and the stirring is continued for 2 hours.
[0028] Activation: The silica-alumina source matrix is cooled to 50℃, the composite alkaline activator is slowly added, 1 part of the amino silane coupling agent is also added, and the temperature is maintained at 50℃ and 500 rpm for 1 hour to complete the functional modification. After the reaction solution is cooled to room temperature, it is discharged, sealed and aged for 24 hours before use. Example 1
[0029] The components include the following substances: 70# base pitch 70 parts; geopolymer precursor solution 8 parts (obtained from the preparation example); star-shaped SBS modifier 3 parts, epoxidized natural rubber 1.5 parts, epoxy soybean oil 2 parts, mercapto silane coupling agent 0.4 parts, dibutyl tin dilaurate 0.03 parts, hydrogenated petroleum resin 1 part, nano organic montmorillonite 1.5 parts, Fischer-Tropsch wax 0.5 parts, polyethylene wax 0.5 parts, light stabilizer 0.1 parts, antioxidant 0.05 parts.
[0030] Preparation method: Preparation of the organic elastomer masterbatch: 70# base pitch is heated to 160℃, hydrogenated petroleum resin and star-shaped SBS modifier are added, and high-speed shearing is performed at 4000 rpm for 1 hour to ensure that the star-shaped SBS modifier is completely swollen and dispersed. Epoxidized natural rubber is added, and shearing is continued at 3000 rpm for 30 minutes to form a uniform organic elastomer masterbatch, which is cooled to 150℃ for standby; Pre-reaction: The geopolymer precursor solution, epoxy soybean oil, 0.3 parts of mercapto silane coupling agent, and dibutyl tin dilaurate are mixed and stirred at 65℃ and 500 rpm for 40 minutes. After the system is slightly thickened, a geopolymer hybrid pre-reaction solution is obtained for standby; Formal reaction: The organic elastomer masterbatch is kept at a temperature of 150℃, and the geopolymer hybrid pre-reaction solution is slowly added under high-speed shearing at 3500 rpm. Then, 0.1 parts of mercapto silane coupling agent is added, and high-speed shearing is continued for 1 hour. Nano organic montmorillonite, Fischer-Tropsch wax, and polyethylene wax are added, and the shearing speed is reduced to 2500 rpm, and shearing is continued for 30 minutes to ensure uniform dispersion of the nano materials; Stable curing: After cooling to 140℃, light stabilizer and antioxidant are added, and stirring is performed at 800 rpm for 30 minutes. The final product is moved to a 160℃ oven for static development for 90 minutes, and then it is discharged and packaged. Example 2
[0031] The difference between this example and Example 1 is that the geopolymer precursor solution is 10 parts. Example 3
[0032] The difference between this example and Example 1 is that the geopolymer precursor solution is 6 parts. Example 4
[0033] The difference between this embodiment and embodiment 1 is that the star SBS modifier is 4 parts. Example 5
[0034] The difference between this embodiment and embodiment 1 is that the star SBS modifier is 2 parts. Example 6
[0035] The difference between this embodiment and embodiment 1 is that the epoxy soybean oil is 2.5 parts, and the mercapto silane coupling agent is 0.5 parts. Example 7
[0036] The difference between this embodiment and embodiment 1 is that the epoxy soybean oil is 1.5 parts, and the mercapto silane coupling agent is 0.3 parts. Example 8
[0037] The difference between this embodiment and embodiment 1 is that 1.5 parts of ordinary natural rubber is used instead of epoxidized natural rubber. Example 9
[0038] The difference between this embodiment and embodiment 1 is that 0.4 parts of an amino silane coupling agent is used instead of a mercapto silane coupling agent.
[0039] Comparative Example 1 The difference between this comparative example and embodiment 1 is that the geopolymer precursor solution and the pre-reaction step are removed, and the total asphalt fraction is made up.
[0040] Comparative Example 2 The difference between this comparative example and embodiment 1 is that the epoxy soybean oil and the mercapto silane coupling agent are removed.
[0041] Comparative Example 3 The difference between this comparative example and embodiment 1 is that the epoxy soybean oil, the mercapto silane coupling agent, dibutyl tin dilaurate, and the epoxidized natural rubber are removed, and 1.5 parts of natural ordinary rubber and 2 parts of tall oil are used instead.
[0042] Performance tests: softening point, 5℃ ductility, 135℃ viscosity, 48h segregation softening point difference, dynamic stability, freeze-thaw splitting strength ratio, bending failure strain test indicators are carried out in accordance with "Highway Engineering Asphalt and Asphalt Mixture Test Procedures" (JTGE20-2011) Tensile strength is detected in accordance with ASTM D4541 Rutting factor is detected in accordance with standard AASHTO T315 Table 1 Performance test results of asphalt obtained in each embodiment and comparative example
[0043] Table 2 Asphalt mixture road performance index comparison
[0044] Example 1 As the basic formula, through the synergistic effect of the geopolymer precursor solution, the star-shaped SBS modifier, the epoxidized natural rubber and the epoxy soybean oil-mercapto silane bridging system, a stable organic-inorganic hybrid network structure is constructed. The comprehensive performance is excellent, not only realizes the significant improvement of high temperature stability, interface bonding strength and water damage resistance, but also maintains good low temperature toughness and construction workability.
[0045] Examples 2 and 3 mainly verify the key role of the geopolymer precursor solution in the control of material performance by adjusting the amount of the geopolymer precursor solution. Increasing the amount can significantly strengthen the inorganic network and give the material more excellent high temperature performance and rigidity; reducing the amount makes the material exhibit better low temperature deformation ability.
[0046] Examples 4 and 5 mainly clarify the role of the organic elastomer grid in the system by changing the amount of the star-shaped SBS modifier. Increasing the amount of SBS mainly enhances the elasticity and low temperature crack resistance of the material; on the contrary, reducing the amount leads to short board of the overall performance, especially the toughness. SBS raw material is an important basis for maintaining the flexibility of the material.
[0047] Examples 6 and 7 change the amount of the chemical bridging agent. Adequate and appropriate bridging agent is the guarantee for forming a perfect hybrid grid and obtaining excellent interface performance and storage stability; and insufficient bridging agent will lead to the deterioration of interface bonding strength and serious decline of storage stability, which also shows that the epoxy soybean oil-mercapto silane bridging system is an important guarantee for realizing the organic-inorganic two-phase composite.
[0048] Example 8 uses ordinary natural rubber instead of epoxidized natural rubber, and the interface bonding strength and water damage resistance of the product appear obvious decline, which also proves that the epoxy groups in the epoxidized natural rubber can participate in the chemical reaction and play a key role in building strong interface bonding.
[0049] Example 9 uses amino silane coupling agent instead of mercapto silane coupling agent, and the obtained product also fails to reach the optimal level, which also shows that the specific click chemical reaction path of mercapto-epoxy adopted in the present application has unique advantages in reaction efficiency and final performance effect.
[0050] In Comparative Example 1, the geopolymer component is missing, and the high temperature performance is obviously insufficient. In Comparative Example 2, the chemical bridging agent is removed, which leads to the destruction of the system compatibility and cannot be effectively detected. Comparative Example 3 is a traditional physical blending process, and the comprehensive performance is significantly different from that of the examples.
[0051] In summary, by the synergistic reaction of the geopolymer precursor solution and the bio-based epoxy compounds (including epoxy soybean oil and epoxidized natural rubber) under the specific bridging system, a stable organic-inorganic hybrid interpenetrating network structure is constructed. This structure design can solve the technical bottleneck of poor compatibility between geopolymer and asphalt organic phase, thereby simultaneously endowing the material with excellent high-temperature stability, strong interfacial bonding force, excellent water damage resistance and good storage stability, without sacrificing its low-temperature performance and workability. The specific function and synergistic mechanism of the key components are verified, and the absence or improper replacement of any key component will lead to a significant decline in performance, especially the interface-related performance. Compared with traditional modification technology such as physical blending, the present application realizes a qualitative leap in performance, showing outstanding technical advantages and application prospects.
[0052] The embodiments of the present embodiment are the preferred embodiments of the present application, and are not limited to the protection scope of the present application, wherein the same parts are represented by the same marks. Therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.
Claims
1. A modified bitumen, characterized in that, Comprise the following components: Road asphalt, geopolymer precursor solution, star SBS modifier, epoxidized natural rubber, epoxy soybean oil, mercapto silane coupling agent, dibutyl tin dilaurate, hydrogenated petroleum resin, nano organic montmorillonite, wax regulator, light stabilizer and antioxidant.
2. The modified bitumen of claim 1, wherein, The wax regulator comprises Fischer-Tropsch wax and polyethylene wax.
3. The modified bitumen of claim 2, wherein, Comprise the following components: Road asphalt is 60-80 parts; geopolymer precursor solution is 5-12 parts; star SBS modifier is 1-5 parts; epoxidized natural rubber is 0.5-3 parts; epoxy soybean oil is 1-3 parts; mercapto silane coupling agent is 0.2-0.6 parts; Dibutyl tin dilaurate 0.01-0.05 parts; hydrogenated petroleum resin 0.5-2 parts; nano organic montmorillonite 1-2 parts; Fischer-Tropsch wax 0.3-1 part; polyethylene wax 0.3-1 part; light stabilizer 0.05-0.2 part; antioxidant 0.02-0.1 part.
4. The modified bitumen of claim 3, wherein, The weight parts of the star SBS modifier is 3 parts.
5. The modified bitumen of claim 3, wherein, The weight parts of the geopolymer precursor solution is 8 parts.
6. The modified bitumen of claim 3, wherein, The weight parts of the epoxidized natural rubber is 1.5 parts, and the weight parts of the epoxy soybean oil is 2 parts.
7. The modified bitumen of claim 1, wherein, The geopolymer precursor solution comprises the following components: sodium silicate solution, calcined kaolin, sodium hydroxide, alkaline silica sol, amino silane coupling agent, deionized water.
8. The modified bitumen of claim 7, wherein, Comprise the following components: sodium silicate solution 50-70 parts, calcined kaolin 10-20 parts, sodium hydroxide 4-8 parts, alkaline silica sol 5-15 parts, amino silane coupling agent 0.3-0.5 parts, deionized water 5-10 parts.
9. The modified bitumen of claim 7, wherein, The geopolymer precursor solution is prepared by the following method: Dissolve the sodium hydroxide in deionized water and stir to form a concentrated lye; Slowly add the alkaline silica sol to the concentrated lye at 30-50℃, and incubate and stir to obtain a composite alkaline activator; Add the calcined kaolin to the sodium silicate solution at 50-70℃ and under stirring, and continue to stir and age to obtain a silicon-aluminum source matrix; Cool the silicon-aluminum source matrix to 45-55℃, add the composite alkaline activator and the amino silane coupling agent, and continue to react at 45-55℃ for 0.5-1.5 hours. After discharging, seal and age for 20-28 hours to obtain the geopolymer precursor solution.
10. A process for the preparation of the modified bitumen as claimed in claims 1-9, characterized in that, Comprise the following steps: Heat the road asphalt to 155-165℃, add the hydrogenated petroleum resin and the star SBS modifier, and high-speed shear at a speed of 3500-4500 rpm for 0.8-1.2 hours. Then add the epoxidized natural rubber and continue to shear at a speed of 2500-3500 rpm for 20-40 minutes to form an organic elastomer masterbatch; Mix the geopolymer precursor solution, the epoxy soybean oil, part of the mercapto silane coupling agent and the dibutyl tin dilaurate at 60-70℃ and a stirring speed of 400-600 rpm for 30-50 minutes to obtain a geopolymer hybrid pre-reaction liquid; adding the nano-organic montmorillonite, the Fischer-Tropsch wax and the polyethylene wax after adding the geopolymer hybrid pre-reaction solution into the organic elastomer masterbatch and adding the remaining mercapto silane coupling agent, shearing at a high speed of 145-155 ℃ and a rotating speed of 3000-4000 rpm for 0.8-1.2 hours, adjusting the shearing speed to 2000-3000 rpm and continuing to shear for 20-40 minutes to obtain a primary product; cooling the primary product to 135-145 ℃, adding the light stabilizer and the antioxidant, stirring at a rotating speed of 500-1000 rpm for 20-40 minutes, and then statically developing at 155-165 ℃ for 80-100 minutes to obtain the modified asphalt.