Composite modified high-performance emulsified asphalt and preparation method thereof
By using SEBS and polyethylene composite modified asphalt and a specific emulsification process, the problems of high-temperature stability, low-temperature crack resistance and storage stability of emulsified asphalt were solved, and high-performance emulsified asphalt suitable for high-grade pavements and heavy traffic was prepared.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-09
- Publication Date
- 2026-03-10
AI Technical Summary
Existing emulsified asphalt has shortcomings in high-temperature stability, low-temperature crack resistance, and storage stability. Furthermore, the modifier is prone to degradation during emulsification, resulting in poor performance and making it difficult to apply in high-grade pavements and heavy traffic.
High-performance emulsified asphalt was prepared by using SEBS modifier and polyethylene modifier to modify asphalt, combined with compatibilizer and asphalt phase stabilizer, nonionic and cationic emulsifiers and aqueous phase stabilizer, through a specific heating shear sequence and emulsification process.
It achieves a balance between high-temperature rutting resistance, low-temperature crack resistance, and excellent storage stability, making it suitable for various applications in road engineering.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of road engineering materials technology, specifically to an emulsified asphalt. In particular, it relates to a high-performance emulsified asphalt prepared by composite modification with hydrogenated styrene-butadiene-styrene block copolymer (SEBS) and polyethylene (PE) through a specific emulsification process. This product possesses excellent high and low temperature performance, storage stability, and workability. Background Technology
[0002] Emulsified asphalt is a stable emulsion formed by dispersing asphalt in water through mechanical shearing under the action of an emulsifier. Because it is fluid at room temperature and does not require high-temperature heating during construction, it offers significant advantages such as energy saving, environmental friendliness, and safety, and is widely used in tack coats, seal coats, micro-surfacing, and cold-mix asphalt mixtures.
[0003] However, ordinary emulsified asphalt has two major bottlenecks: 1. Insufficient performance: Its mechanical properties after film formation (such as strength, elasticity, and adhesion) are far lower than those of hot-mix modified asphalt, especially its high-temperature rutting resistance and low-temperature crack resistance, which limits its application in high-grade pavements and heavy traffic.
[0004] 2. Challenges in the Preparation of Modified Emulsified Asphalt: To improve performance, asphalt is usually first polymer-modified (e.g., SBS-modified) before emulsification. However, polymer-modified asphalt such as SBS has high viscosity, making emulsification difficult; moreover, the modifier is prone to degradation due to high-speed shear during emulsification, leading to performance degradation. In addition, the poor compatibility between the modifier and emulsifier system often results in poor emulsion storage stability and easy demulsification and precipitation.
[0005] While existing technologies utilize SBS and SBR to modify emulsified asphalt, their modification effects, particularly in balancing high and low temperature performance, still lag significantly behind those of hot-mix SBS-modified asphalt. SEBS, as a hydrogenated product of SBS, exhibits superior heat resistance, aging resistance, and fatigue resistance; however, its compatibility and dispersion in asphalt are more challenging, resulting in limited reports and unsatisfactory effects when used in emulsified asphalt. Polyethylene (PE) can significantly improve the stiffness and high-temperature performance of asphalt, but its use alone exacerbates low-temperature brittleness.
[0006] Therefore, developing a technology that combines the advantages of SEBS and PE and successfully emulsifies them into a stable, high-performance emulsion is an urgent problem to be solved in this field. Summary of the Invention
[0007] This invention provides a composite modified high-performance emulsified asphalt and its preparation method to solve the problems of insufficient high-temperature stability, poor low-temperature crack resistance and elastic recovery ability, and difficulties in emulsification and poor storage stability when the polymer content is high. By introducing SEBS modifier and polyethylene modifier into the base asphalt, and combining them with compatibilizer and asphalt phase stabilizer to construct a composite modified asphalt system, and simultaneously using a non-ionic emulsifier and cationic emulsifier combined with an aqueous phase stabilizer to construct an emulsifier aqueous solution, combined with specific heating shear sequence and emulsification process conditions, the prepared emulsified asphalt retains its room-temperature workability while also possessing high-temperature rutting resistance, low-temperature crack resistance, and excellent storage stability. It is suitable for various applications in road engineering, including prime coats, tack coats, seal coats, and cold-mix asphalt mixtures.
[0008] According to a first aspect of the present invention, a composite modified high-performance emulsified asphalt is provided, comprising, by weight: 100 parts of composite modified asphalt; 60-80 parts of emulsifier aqueous solution; in, The composite modified asphalt is prepared from base asphalt, SEBS modifier, polyethylene modifier, compatibilizer and asphalt phase stabilizer; The emulsifier aqueous solution is composed of water, a composite emulsifier, and an aqueous phase stabilizer. The composite emulsifier is a mixture of a nonionic emulsifier and a cationic emulsifier.
[0009] In some technical solutions, the composite modified asphalt is prepared from the following components in parts by weight: 80-95 parts of base asphalt; 3-10 parts of SEBS modifier; Polyethylene modifier, 2-8 parts; 3-8 parts compatibilizer; Stabilizer 0.1 to 0.5 parts.
[0010] In some technical solutions, the raw materials for preparing the composite modified asphalt are selected from one or more of the following: The base asphalt is road petroleum asphalt with a penetration grade of 50# to 90#. The SEBS modifier is a star-shaped or linear hydrogenated styrene-butadiene-styrene block copolymer; The polyethylene modifier is low-density polyethylene or linear low-density polyethylene; The compatibilizer is a naphthenic oil or an aromatic oil; The asphalt phase stabilizer is sulfur.
[0011] In some technical solutions, the mass ratio of nonionic emulsifier to cationic emulsifier in the composite emulsifier is (1:1) to (1:3), the amount of composite emulsifier is 1.0% to 3.0% of the weight of water, and the amount of aqueous phase stabilizer is 0.2% to 1.0% of the weight of water.
[0012] In some technical solutions, the nonionic emulsifier is fatty alcohol polyoxyethylene ether, the cationic emulsifier is octadecyl dimethyl benzyl ammonium chloride, and the aqueous phase stabilizer is selected from at least one of calcium chloride, polyvinyl alcohol, and dextran.
[0013] The composite modified high-performance emulsified asphalt provided in this case adopts a composite modification system that combines rigidity and flexibility. SEBS, as the "flexible" component, provides excellent elasticity, toughness, and low-temperature deformation capacity. Its hydrogenated structure makes its aging resistance superior to SBS, ensuring the long-term performance stability of the emulsion. Polyethylene (PE), as the "rigid" component, forms a crystalline network structure in the asphalt, greatly improving the asphalt's stiffness, viscosity, and high-temperature deformation resistance. With the help of a compatibilizer, SEBS and PE form an interpenetrating network structure in the asphalt. SEBS effectively improves the brittleness tendency introduced by PE, while PE strengthens the rigid support of the SEBS network. The synergy between the two results in a final product that simultaneously possesses an extremely high softening point and excellent low-temperature ductility, achieving a perfect balance between high and low temperature performance.
[0014] According to a second aspect of the present invention, a method for preparing the above-mentioned composite modified high-performance emulsified asphalt is further provided, comprising the following steps: The base asphalt is heated, and compatibilizer, SEBS modifier, and polyethylene modifier are added sequentially for shearing. Finally, an asphalt phase stabilizer is added for development to obtain composite modified asphalt. The composite emulsifier and aqueous phase stabilizer are dissolved in hot water, and the pH value is adjusted to obtain an aqueous emulsifier solution; The obtained composite modified asphalt was emulsified together with an emulsifier aqueous solution through a colloid mill to obtain composite modified high-performance emulsified asphalt.
[0015] In some technical solutions, the specific preparation steps of the composite modified asphalt are as follows: Heat the base asphalt to 160-175℃, add the compatibilizer, and stir at low speed for 5-10 minutes. Under high-speed shearing, the SEBS modifier is slowly added and sheared for 30 to 60 minutes until a homogeneous system is formed; Maintain the temperature at 165-175℃, add polyethylene modifier, and continue high-speed shearing for 30-45 minutes; Then, an asphalt phase stabilizer is added, and the stirring speed is reduced for 60-90 minutes to obtain the composite modified asphalt.
[0016] In some technical solutions, the shearing rate of the high-speed shearing is 3000-5000 rpm, and the stirring speed during the development stage is 500-1000 rpm.
[0017] In some technical solutions, the specific preparation steps of the emulsifier aqueous solution are as follows: Add the composite emulsifier and aqueous phase stabilizer to hot water at 60-70°C and stir thoroughly until completely dissolved, then adjust the pH value to 2-4.
[0018] In some technical solutions, the temperature at which the composite modified asphalt enters the colloid mill is 160–175°C, and the temperature at which the emulsifier aqueous solution enters the colloid mill is 50–65°C.
[0019] The method for preparing composite modified high-performance emulsified asphalt provided in this case employs a composite emulsifier system, specifically a nonionic-cationic composite emulsifier. The nonionic emulsifier offers broad adaptability and improves compatibility with polymers, while the cationic emulsifier ensures good adhesion between the emulsion and the aggregate. This system effectively encapsulates high-viscosity composite modified asphalt particles, forming a robust double electrical layer to ensure emulsion stability. Simultaneously, it provides a precise preparation process: by controlling the temperature of the modified asphalt and the pH and temperature of the emulsifier aqueous solution, emulsification is carried out under optimal viscosity and surface tension conditions, avoiding emulsification failure or modifier degradation due to improper processing.
[0020] The present invention, by employing the above technical solution, has at least the following beneficial effects: 1. This invention introduces SEBS modifier and polyethylene modifier into the base asphalt simultaneously, along with appropriate amounts of compatibilizer and asphalt phase stabilizer, to create a composite network structure within the modified asphalt where elastic and rigid phases work synergistically. The SEBS modifier forms a continuous or quasi-continuous elastic phase in the asphalt, improving the elastic recovery and low-temperature deformation capacity of the asphalt binder. The polyethylene modifier forms a rigid skeleton with crystalline characteristics, significantly improving the high-temperature deformation resistance of the modified asphalt. The compatibilizer improves the compatibility between the SEBS and polyethylene modifiers and the base asphalt, refining and dispersing each phase within the asphalt to form an interpenetrating network structure. The preferred asphalt phase stabilizer is sulfur, which generates limited cross-linking during the development stage, further stabilizing the structural relationship between the polymer and the asphalt. Through this combination, the modified asphalt exhibits a high softening point and rutting resistance at high temperatures, while maintaining good ductility and crack resistance at low temperatures, achieving a comprehensive balance between high-temperature stability and low-temperature flexibility.
[0021] 2. This invention employs a compound system of nonionic and cationic emulsifiers, and introduces an aqueous phase stabilizer into the aqueous phase. This allows the emulsifier aqueous solution to simultaneously possess excellent wetting and encapsulation capabilities for the composite modified asphalt phase and superior adhesion to the aggregate surface. The nonionic emulsifier is preferably fatty alcohol polyoxyethylene ether, which has good oleophilic-hydrophilic balance properties, facilitating the formation of a stable interfacial adsorption layer on the composite modified asphalt surface, reducing oil-water interfacial tension, and thus obtaining fine and uniformly distributed droplets under colloid mill shearing. The cationic emulsifier is preferably octadecyl dimethyl benzyl ammonium chloride, which can impart a positive charge to the droplet surface, enhancing the electrostatic repulsion between droplets and improving the adhesion of emulsified asphalt to the negatively charged aggregate surface. The aqueous phase stabilizer is preferably calcium chloride, polyvinyl alcohol, and / or dextran, which further inhibits droplet aggregation and sedimentation by providing inorganic electrolyte action and polymeric protective colloid action. The synergistic effect of the above-mentioned aqueous system and the composite modified asphalt system gives the resulting emulsified asphalt excellent storage stability and workability, and it is not prone to severe stratification or demulsification during a long storage period.
[0022] 3. In the preparation process, this invention achieves full formation and stable transfer of the composite modified asphalt structure into the emulsion system by rationally controlling the order of addition of each component and the shear development conditions. The base asphalt is first mixed with a compatibilizer at 160–175°C, which helps reduce the system viscosity and pre-improves the polymer's dissolution environment. The SEBS modifier is slowly added under high-speed shear conditions and sheared for a certain time, ensuring that the SEBS fully swells and disperses to form a uniform elastic phase. A polyethylene modifier is then introduced while maintaining a relatively high temperature and shearing continues, allowing the polyethylene to fully melt and disperse in the asphalt, forming a fine and continuous rigid phase. Based on the above, an asphalt phase stabilizer is added and developed at a low stirring speed for a period of time, which avoids polymer degradation caused by excessive shearing and simultaneously completes a moderate cross-linking or structural stabilization process. Through these steps, the composite modified asphalt system possesses a relatively stable microstructure and suitable rheological properties, providing a good foundation for the subsequent emulsification process.
[0023] 4. In the emulsification stage, this invention controls the temperature of the composite modified asphalt and the emulsifier aqueous solution as they enter the colloid mill, ensuring that their viscosities are matched within a suitable range. The composite modified asphalt has sufficient fluidity at a temperature of 160–175°C, facilitating its refinement into droplets within the colloid mill's gaps. The emulsifier aqueous solution, at 50–65°C, ensures the activity of both the emulsifier and the aqueous phase stabilizer, while avoiding excessively low temperatures leading to excessively high system viscosity or excessively high temperatures leading to decreased emulsifier stability. By subjecting the two phases to high-shear emulsification in the colloid mill and cooling after discharge, the resulting emulsified asphalt droplets have uniform particle size and an intact interfacial film. Its demulsification performance matches its workability, facilitating on-site paving, mixing, and compaction, and providing excellent road performance after film formation. Detailed Implementation
[0024] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those familiar to those skilled in the art. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to the methods of the present invention. The preferred embodiments and materials described herein are for illustrative purposes only.
[0025] Example 1
[0026] We provide composite modified high-performance emulsified asphalt product C, which is prepared from raw materials including composite modified asphalt and an aqueous emulsifier solution.
[0027] Composite modified asphalt, by weight, includes: 84.7 parts of base asphalt; Six star-shaped SEBS samples; 4 portions of LLDPE; 5 parts naphthenic oil; 0.3 parts sulfur.
[0028] The emulsifier aqueous solution comprises, by weight: 70 parts water; 1.4 parts of compound emulsifier; 0.35 parts of dextran.
[0029] The mass ratio of nonionic emulsifier to cationic emulsifier in the composite emulsifier is 1:2, the amount of composite emulsifier is 2% of the weight of water, and the amount of dextran is 0.5% of the weight of water.
[0030] The base asphalt is road petroleum asphalt with a penetration grade of 90#, the star-shaped SEBS is star-shaped hydrogenated styrene-butadiene-styrene block copolymer, the LLDPE is linear low-density polyethylene, naphthenic oil is used as a compatibilizer to improve the compatibility between the polymer and the asphalt phase, and sulfur is used as an asphalt phase stabilizer; the nonionic emulsifier is fatty alcohol polyoxyethylene ether, the cationic emulsifier is octadecyl dimethyl benzyl ammonium chloride, and dextran is used as an aqueous phase stabilizer to protect the colloid in the aqueous phase.
[0031] In this embodiment, the preparation process of the composite modified asphalt is as follows: Heat the base asphalt to 170°C, add 5 parts of naphthenic oil at this temperature, start low-speed stirring, and stir for 7 minutes to ensure that the naphthenic oil is evenly dispersed in the base asphalt.
[0032] Switch the mixing device to high-speed shear mode. At a shear rate of 4000 rpm, slowly add 6 parts of star-shaped SEBS, controlling the addition rate to avoid local agglomeration. Continue high-speed shearing for 45 minutes until the system has a uniform appearance and no visible gel particles, forming a homogeneous SEBS modified asphalt system.
[0033] Keep the system temperature at around 170℃, slowly add 4 parts of LLDPE, and continue shearing at around 4000 rpm for 35 minutes to allow the LLDPE to fully melt and disperse in the asphalt phase, thus obtaining a composite modified system in which the elastic and rigid phases are synergistically distributed.
[0034] Add 0.3 parts of sulfur to the system, reduce the stirring speed to 800 rpm, and continue stirring at a temperature of about 170°C for 80 minutes to allow the sulfur to undergo limited cross-linking or structural stabilization with the asphalt and polymer system under high temperature conditions, thereby obtaining composite modified asphalt. This composite modified asphalt has moderate viscosity and relatively stable microstructure, making it suitable for subsequent emulsification processes.
[0035] The emulsifier aqueous solution was prepared in this embodiment according to the following steps: Take 70 parts by weight of water, heat to 65°C, and add 1.4 parts of a composite emulsifier while stirring. The mass ratio of nonionic to cationic emulsifier is 1:2. Continue stirring until the composite emulsifier is completely dissolved and uniformly dispersed in the aqueous phase. Then add 0.35 parts of dextran and maintain stirring at 65°C to fully dissolve the dextran and form a uniform transparent or semi-transparent solution. Slowly add an acid adjuster to adjust the pH of the emulsifier aqueous solution to 3, placing the system within the suitable pH range for cationic emulsified asphalt, thus obtaining an emulsifier aqueous solution for emulsification. Through the combination of the composite emulsifier and dextran, the aqueous phase possesses both good interfacial activity and certain electrical stability and protective colloidal stabilization effects.
[0036] In the emulsification step, the composite modified asphalt prepared above is kept at 165°C, while the emulsifier aqueous solution is kept at 60°C. The composite modified asphalt and the emulsifier aqueous solution are continuously fed into a colloid mill, and emulsification is carried out at a set interval. After discharge, the material is cooled to room temperature to obtain a composite modified high-performance emulsified asphalt with a uniform appearance, no obvious coarse particles, and no obvious stratification, i.e., product C.
[0037] Samples were prepared after removing PE, SEBS, and sulfur from the formulation of Example 1. The comparison of evaporation residue indicators is as follows:
[0038] The data in the table shows that PE, SEBS, and sulfur all affect the product data.
[0039] Example 2
[0040] Provide composite modified high-performance emulsified asphalt product D, the raw materials for which are prepared include composite modified asphalt and an aqueous emulsifier solution.
[0041] Composite modified asphalt, by weight, includes: 78.6 parts of base asphalt; Linear SEBS, 8 parts; 6 portions of LDPE; 7 parts aromatic oil; 0.4 parts sulfur.
[0042] The emulsifier aqueous solution comprises, by weight: 65 parts water; 1.95 parts of compound emulsifier; 0.65 parts of polyvinyl alcohol.
[0043] The mass ratio of nonionic emulsifier to cationic emulsifier in the composite emulsifier is 1:1.5, the amount of composite emulsifier is 3% of the weight of water, and the amount of polyvinyl alcohol is 1% of the weight of water.
[0044] The base asphalt is road petroleum asphalt with a penetration grade of 70#, linear SEBS is linear hydrogenated styrene-butadiene-styrene block copolymer, LDPE is low-density polyethylene, aromatic oil is used as a compatibilizer to improve the compatibility between the polymer and the asphalt phase, and sulfur is used as an asphalt phase stabilizer; the nonionic emulsifier is fatty alcohol polyoxyethylene ether, the cationic emulsifier is octadecyl dimethyl benzyl ammonium chloride, and polyvinyl alcohol is used as an aqueous phase stabilizer to protect the colloid in the aqueous phase.
[0045] In this embodiment, the preparation process of the composite modified asphalt is as follows: Heat the base asphalt to 165°C, add 7 parts of aromatic oil at this temperature, start low-speed stirring, and stir for 10 minutes to ensure that the aromatic oil is evenly dispersed in the base asphalt.
[0046] Switch the mixing device to high-speed shear mode. At a shear rate of 4000 rpm, slowly add 8 parts of linear SEBS, controlling the addition rate to avoid local agglomeration. Continue high-speed shearing for 45 minutes until the system has a uniform appearance and no visible gel particles, forming a homogeneous SEBS modified asphalt system.
[0047] Keep the system temperature at around 170℃, slowly add 6 parts of LDPE, and continue shearing at around 4000 rpm for 35 minutes to allow LDPE to fully melt and disperse in the asphalt phase, thus obtaining a composite modified system in which the elastic and rigid phases are synergistically distributed.
[0048] Add 0.4 parts of sulfur to the system, reduce the stirring speed to 800 rpm, and continue stirring at a temperature of about 170°C for 80 minutes to allow the sulfur to undergo limited cross-linking or structural stabilization with the asphalt and polymer system under high temperature conditions, thereby obtaining composite modified asphalt. This composite modified asphalt has moderate viscosity and a relatively stable microstructure, making it suitable for subsequent emulsification processes.
[0049] The emulsifier aqueous solution was prepared in this embodiment according to the following steps: Take 65 parts by weight of water, heat to 70°C, and add 1.95 parts of a composite emulsifier while stirring. The mass ratio of nonionic to cationic emulsifier is 1:1.5. Continue stirring until the composite emulsifier is completely dissolved and uniformly dispersed in the aqueous phase. Then add 0.65 parts of polyvinyl alcohol and maintain stirring at 70°C to fully dissolve the polyvinyl alcohol and form a uniform transparent or semi-transparent solution. Slowly add an acid regulator to adjust the pH of the emulsifier aqueous solution to 4, placing the system within the suitable pH range for cationic emulsified asphalt, thus obtaining an emulsifier aqueous solution for emulsification. Through the combination of the composite emulsifier and polyvinyl alcohol, the aqueous phase possesses both good interfacial activity and certain electrical stability and protective colloidal stabilization effects.
[0050] In the emulsification step, the composite modified asphalt prepared above is kept at 170℃, while the emulsifier aqueous solution is kept at 65℃. The composite modified asphalt and the emulsifier aqueous solution are continuously fed into a colloid mill, and emulsification is carried out at a set interval. After discharge, the material is cooled to room temperature to obtain a composite modified high-performance emulsified asphalt with a uniform appearance, no obvious coarse particles, and no obvious stratification, i.e., product D.
[0051] Samples were prepared after removing PE, SEBS, and sulfur from the formulation of Example 2. The comparison of evaporation residue indicators is as follows:
[0052] The data in the table shows that PE, SEBS, and sulfur all affect the product data.
[0053] Comparative Example Ordinary SBS modified asphalt (SBS content 4.5%) was used and emulsified with the same cationic emulsifier to obtain ordinary SBS modified emulsified asphalt.
[0054] Performance testing: The emulsified asphalts prepared in Examples 1 and 2 and the comparative example were tested for their evaporation residue properties. The results are shown in the table below:
[0055] Test results show that the emulsified asphalt prepared in Examples 1 and 2 of this invention exhibits significantly better softening point (high-temperature performance) and low-temperature ductility (low-temperature performance) than the conventional SBS-modified emulsified asphalt in the comparative example, achieving an optimal balance between high and low temperature performance. Furthermore, the emulsion itself demonstrates excellent storage stability.
[0056] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention, including the best mode, and also to enable any person skilled in the art to practice the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A composite modified high performance emulsified asphalt, characterized by, It comprises the following components by weight parts: Composite modified asphalt 100 parts; Water solution of emulsifier 60-80 parts; Among them, The composite modified asphalt is prepared from base asphalt, SEBS modifier, polyethylene modifier, compatibility agent and asphalt phase stabilizer; The water solution of emulsifier is composed of water, composite emulsifier and water phase stabilizer, and the composite emulsifier is a complex of non-ionic emulsifier and cationic emulsifier.
2. The compound modified high performance emulsified asphalt according to claim 1, characterized in that, The composite modified asphalt is prepared from the following components by weight parts: Base asphalt 80-95 parts; SEBS modifier 3-10 parts; Polyethylene modifier 2-8 parts; Compatibility agent 3-8 parts; Stabilizer 0.1-0.5 parts.
3. The complex modified high performance emulsified asphalt according to claim 1 or 2, characterized in that, The preparation raw materials of the composite modified asphalt select one or several of the following: The base asphalt is road petroleum asphalt with penetration grade of 50#-90#; The SEBS modifier is star-shaped or linear hydrogenated styrene-butadiene-styrene block copolymer; The polyethylene modifier is low-density polyethylene or linear low-density polyethylene; The compatibility agent is naphthenic oil or aromatic oil; The asphalt phase stabilizer is sulfur.
4. The compound modified high performance emulsified asphalt according to claim 1, characterized in that, The mass ratio of non-ionic emulsifier to cationic emulsifier in the composite emulsifier is (1:1)-(1:3), the amount of the composite emulsifier is 1.0%-3.0% of the weight of water, and the amount of the water phase stabilizer is 0.2%-1.0% of the weight of water.
5. The complex modified high performance emulsified asphalt according to claim 1 or 4, characterized in that, The non-ionic emulsifier is fatty alcohol polyoxyethylene ether, the cationic emulsifier is octadecyl dimethyl benzyl ammonium chloride, and the water phase stabilizer is selected from at least one of calcium chloride, polyvinyl alcohol and dextran.
6. A method for preparing the composite modified high performance emulsified asphalt according to any one of claims 1 to 5, characterized in that, It comprises the following steps: Heat the base asphalt, add the compatibility agent, SEBS modifier and polyethylene modifier in sequence for shearing, and finally add the asphalt phase stabilizer for development to obtain the composite modified asphalt; Dissolve the composite emulsifier and water phase stabilizer in hot water, adjust the pH value to obtain the water solution of emulsifier; Emulsify the obtained composite modified asphalt and the water solution of emulsifier together through a colloid mill to obtain the composite modified high-performance emulsified asphalt.
7. The method of claim 6, wherein, The specific preparation steps of the composite modified asphalt are as follows: Heat the base asphalt to 160-175℃, add the compatibility agent, and stir at low speed for 5-10 minutes; Slowly add the SEBS modifier under high-speed shearing, and shear for 30-60 minutes until a homogeneous system is formed; Maintain the temperature at 165-175℃, add the polyethylene modifier, and continue to shear at high speed for 30-45 minutes; Then add the asphalt phase stabilizer, reduce the stirring speed for development for 60-90 minutes to obtain the composite modified asphalt.
8. The method according to claim 7, characterized in that, The shearing rate of the high-speed shearing is 3000-5000 rpm, and the stirring speed in the development stage is 500-1000 rpm.
9. The method of claim 6, wherein, The specific preparation steps of the water solution of emulsifier are as follows: Add the composite emulsifier and water phase stabilizer into hot water at 60-70℃, stir thoroughly until completely dissolved, and adjust the pH value to 2-4.
10. The method of claim 6, wherein, The temperature of the composite modified asphalt entering the colloid mill is 160-175℃, and the temperature of the water solution of emulsifier entering the colloid mill is 50-65℃.