High-content SBS modified emulsified asphalt, preparation method and application thereof

Abstract

The application belongs to the technical field of road engineering asphalt material, and particularly relates to a high-mixing-amount SBS modified emulsified asphalt as well as a preparation method and application thereof. The high-mixing-amount SBS modified emulsified asphalt comprises the following components in parts by weight: 100 parts of base asphalt, 7-15 parts of SBS, 2-4 parts of polyether-ester block copolymer (TPEE), 1-2 parts of triethanolamine borate, 1.5-3.0 parts of Gemini double-cation emulsifier, and 60-75 parts of deionized water. The application provides hydrophilic sites by using amphiphilic polyether-ester block copolymer, realizes sulfur-free and mild dynamic crosslinking by using triethanolamine borate, and makes the high-mixing-amount SBS base asphalt have emulsifiability by cooperating with the Gemini double-cation emulsifier. The 5-day storage stability of the emulsified asphalt prepared by the application is less than or equal to 1.0%, the evaporation residue softening point is greater than or equal to 90 DEG C, the 5 DEG C ductility is greater than or equal to 40 cm, the 60 DEG C dynamic viscosity is greater than 200000 Pa.s, and the elastic recovery is greater than or equal to 95%. The application solves the industry problems that the traditional high-mixing-amount SBS modified asphalt is difficult to emulsify and has poor stability, and has the advantages of simple process, green environmental protection, high efficiency and controllability, and can be applied to cold mixing and cold paving of ultra-thin wearing layers.

Description

Technical Field

[0001] This invention relates to the field of asphalt materials technology for road engineering, and in particular to a high-content SBS modified emulsified asphalt, its preparation method, and its application. Background Technology

[0002] Ultra-thin wearing course generally refers to an asphalt concrete structural wearing course with a thickness of no more than 2.0 cm. It is used for preventive maintenance of asphalt pavement and features high skid resistance and low noise. It can effectively improve the driving safety and comfort of the road surface, while also protecting the old pavement and delaying the occurrence and development of pavement defects (such as cracks, ruts, and spalling), thereby extending the service life of asphalt pavement. It is one of the most effective technical means for highway maintenance at present.

[0003] High-viscosity, high-elasticity modified asphalt typically refers to SBS-modified asphalt with a high content of SBS. It possesses excellent high-temperature rutting resistance, low-temperature crack resistance, high dynamic viscosity, high viscosity-toughness, and high elastic recovery performance, making it the core binder material for ultra-thin wearing courses. Hot-mix ultra-thin wearing courses utilize traditional hot-mix and hot-laying processes, achieving a wearing course thickness of approximately 1 cm. In highway maintenance projects, if further thinning to 0.5-0.8 cm is required, cold-mix and cold-laying methods are typically employed, and the high-viscosity, high-elasticity modified asphalt is prepared as an emulsified asphalt system for use.

[0004] However, in the preparation of traditional high-viscosity, high-elasticity modified asphalt, aromatic rubber oil is often added as a solubilizer, and sulfur is used for cross-linking to form a rigid three-dimensional network structure. Since neither aromatic oil nor SBS macromolecules contain hydrophilic groups, the high-viscosity, high-elasticity modified asphalt is difficult to emulsify, produces coarse emulsion particles, has poor emulsion stability, is prone to demulsification and stratification, and has a short shelf life, making it difficult to obtain qualified high-viscosity, high-elasticity modified emulsified asphalt. At the same time, traditional asphalt emulsifiers are mostly ordinary single-chain cationic or nonionic surfactants, which lack sufficient emulsification ability for high polymer content systems and cannot meet the emulsification requirements of high SBS content.

[0005] Therefore, developing a high-content SBS modified emulsified asphalt that is emulsifiable, storage-stable, and has excellent performance has become an urgent technical problem to be solved in the field of road engineering. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned problems by providing a high-content SBS modified emulsified asphalt, its preparation method and application. The high-content SBS modified emulsified asphalt has excellent performance indicators, is stable in storage, and can be used for cold-mixed and cold-laid ultra-thin wearing layers.

[0007] The objective of this invention is achieved through the following technical solution: The first objective of this invention is to provide a high-content SBS-modified emulsified asphalt, comprising, by weight: 100 parts base bitumen, 7-15 parts SBS, 2-4 parts polyether-ester block copolymer (TPEE), 1-2 parts triethanolamine borate, 1.5-3.0 parts Gemini biscationic emulsifier, and 60-75 parts deionized water.

[0008] Furthermore, the SBS is linear SBS, with a styrene content of 28-32 wt% and a number-average molecular weight of 70,000-120,000.

[0009] Furthermore, the polyether-ester block copolymer is a polyester hard-segment-polyether soft-segment diblock or multiblock thermoplastic elastomer, and the density of the polyether-ester block copolymer is 1.03~1.10 g / cm³. 3 It has a melting point of 160~210℃, and its molecules contain oleophilic polyester segments and hydrophilic polyether segments. It has good compatibility with SBS and asphalt and can significantly improve the emulsifability of high-content SBS modified asphalt.

[0010] Furthermore, the polyether-ester block copolymer includes an ether segment and an ester segment, wherein the ether segment can be selected from one or more of polytetramethylene ether glycol (PTMEG), polytrimethylene ether glycol (PTTMEG), and polytetrahydrofuran ether glycol (PTHF), and the ester segment can be selected from one or more of polyethylene terephthalate (PET) and polybutylene terephthalate (PBT).

[0011] Furthermore, the polyether-ester block copolymer can be uniformly dispersed in high-content SBS modified asphalt systems. Through physical entanglement and compatibility anchoring between polyester segments and SBS macromolecules, the polyether segments are oriented at the asphalt phase interface, providing stable hydrophilic sites for non-polar SBS. This significantly reduces the emulsification difficulty of high-content SBS modified asphalt, enabling stable emulsification without the use of aromatic oils and traditional surfactants. Simultaneously, this polyether-ester block copolymer improves the low-temperature toughness of the system, enhances the storage stability of the emulsified asphalt, and improves the overall road performance of the modified asphalt after demulsification.

[0012] Furthermore, the triethanolamine borate ester has the molecular formula C6H. 12 BNO3, with an effective content ≥98% and a density of 1.08~1.15 g / cm³. 3 With a thermal decomposition temperature ≥210℃, it is a multifunctional borate ester compound containing N→B coordination bonds, which can form dynamic reversible crosslinks in asphalt and provide hydrophilic sites.

[0013] Furthermore, the core function of triethanolamine borate ester is to provide a mild, dynamically reversible sulfur-free crosslinking effect for high-dosage SBS modified asphalt, avoiding the emulsification difficulties caused by the rigid three-dimensional network formed by traditional sulfur crosslinking. At a processing temperature of 180-190℃, the borate ester bonds in the triethanolamine borate ester molecule can undergo dynamic ring-opening and bonding reactions with the hydroxyl and carboxyl groups in SBS and asphalt, constructing a moderately suitable three-dimensional crosslinking network. This significantly improves the high-temperature rutting resistance, elastic recovery, and bond strength of high-dosage SBS modified asphalt without forming a rigid gel structure, maintaining the excellent fluidity and emulsifability of the parent asphalt. Simultaneously, the polar groups such as hydroxyl and amino groups in its molecule can further supplement hydrophilic sites, forming a synergistic effect with polyether-ester block copolymers and Gemini biscationic emulsifiers, enhancing the emulsification effect, improving the storage stability of the emulsion, and avoiding problems such as stratification and demulsification after emulsification. Ultimately, this achieves the goal of sulfur-free crosslinking, easy emulsification, high performance, and high stability in high-dosage SBS modified asphalt.

[0014] Furthermore, the Gemini bis-cationic emulsifier is a bis-quaternary ammonium salt type Gemini cationic surfactant. The molecule contains a bis-hydrophilic quaternary ammonium group, a bis-long-chain alkyl hydrophobic group, and a flexible linker. The alkyl chain is C12~C16. It has strong interfacial adsorption capacity, high emulsification efficiency, and good emulsion stability, which can significantly improve the storage stability of high-dosage SBS modified emulsified asphalt.

[0015] Furthermore, the core function of Gemini's dual-cationic emulsifier is to adsorb and anchor the oleophilic phase of high-content SBS modified asphalt during emulsification through the adsorption of dual long-chain alkyl hydrophobic groups. The dual hydrophilic quaternary ammonium groups are oriented towards the aqueous phase, forming a dense, high-strength interfacial adsorption film on the surface of asphalt particles. This significantly reduces the interfacial tension between asphalt and water, achieving rapid and uniform emulsification of high-content SBS base asphalt and avoiding problems such as coarse emulsion particles and rapid demulsification. Simultaneously, the cationic groups in the emulsifier molecule can form hydrogen bonds and electrostatic synergistic effects with polar groups such as hydroxyl and ether bonds in polyether-ester block copolymers and triethanolamine borate molecules, further enhancing the stability of the interfacial film and effectively improving the storage performance of emulsified asphalt. This ensures that the emulsified asphalt shows no significant stratification or demulsification within 5 days, meeting the construction and storage requirements of cold-mixed, cold-laid, ultra-thin wearing courses.

[0016] Furthermore, the high-content SBS modified emulsified asphalt has a pH of 9-12 and a 5-day storage stability of ≤1.0%.

[0017] A second objective of this invention is to provide a method for preparing high-content SBS-modified emulsified asphalt, the method comprising the following steps: (1) Heat the base asphalt to 175-185℃, add SBS and polyether-ester block copolymer, stir for 40-60 min; raise the temperature to 180-190℃, add triethanolamine borate, and continue stirring for 30-40 min to obtain the parent asphalt. (2) Dissolve Gemini dual cationic emulsifier in deionized water and adjust the pH value to 9-12 with NaOH to prepare a soap solution at 55-75℃; (3) The parent asphalt and soap solution are emulsified by high-speed shearing at 2000-4000r / min for 5-10min, cooled and discharged to obtain high-content SBS modified emulsified asphalt.

[0018] The third objective of this invention is to provide an application of high-content SBS modified emulsified asphalt in cold-mixed, cold-laid ultra-thin wearing courses.

[0019] Furthermore, the ultrathin wear layer is an ultrathin wear layer with a thickness of 0.8~1.5cm.

[0020] Compared with the prior art, the present invention has the following advantages: 1) Traditional high-content SBS (7-15 parts) relies on sulfur crosslinking and requires the addition of aromatic oils for solubilization, which makes it difficult to emulsify and the emulsion is prone to separation and demulsification. However, this invention provides a high-content SBS modified emulsified asphalt, its preparation method and application. The polyether-ester block copolymer provides hydrophilic sites, triethanolamine borate achieves sulfur-free dynamic mild crosslinking, and Gemini bis-cationic emulsifier enhances emulsification stability. The three work synergistically to enable high-content SBS parent asphalt to emulsify quickly and uniformly to form a stable emulsion.

[0021] 2) This invention provides a high-content SBS modified emulsified asphalt, its preparation method and application. The pH of the emulsified asphalt emulsion is controlled at 9~12, and the 5-day storage stability is ≤1.0%. There is no obvious stratification or demulsification. It has excellent storage stability and can solve the problem of short storage period of traditional high-content SBS emulsified asphalt. It is suitable for the construction and storage requirements of cold-mixed and cold-laid ultra-thin wearing layers, and is convenient for engineering transportation and on-site construction.

[0022] 3) This invention provides a high-content SBS modified emulsified asphalt, its preparation method, and its application. The emulsified asphalt has an evaporation residue softening point ≥90℃, a ductility ≥40cm at 5℃, a dynamic viscosity >200000 Pa·s at 60℃, and an elastic recovery ≥95%. The high-content SBS modified emulsified asphalt has excellent high-temperature rutting resistance, low-temperature crack resistance, high viscosity and toughness, and high elastic recovery performance, which can meet the core binder performance requirements of 0.5~0.8cm cold-mixed and cold-laid ultra-thin wearing course, thus improving the service life of the pavement.

[0023] 4) This invention provides a high-content SBS modified emulsified asphalt, its preparation method and application. It uses triethanolamine borate ester to achieve sulfur-free crosslinking, replacing the traditional sulfur crosslinking agent. It has no odor and no harmful gas generation. The high-content SBS modified emulsified asphalt of this invention is green, environmentally friendly, non-toxic and controllable, which is in line with the development direction of low-carbon and environmentally friendly road engineering materials.

[0024] 5) This invention provides a high-content SBS modified emulsified asphalt, its preparation method and application. The components have strong synergy and reasonable proportions. The preparation process does not require special equipment and can be completed by conventional heating, stirring and emulsification shearing processes. The operation is controllable and the production cost is controllable. It is easy to achieve industrial mass production and has high engineering application value. Detailed Implementation

[0025] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0026] Any preparation methods, materials, structures, or composition ratios not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0027] This invention belongs to the technical field of asphalt materials for road engineering, specifically relating to a high-content SBS modified emulsified asphalt, its preparation method, and its application. The high-content SBS modified emulsified asphalt comprises the following components by weight: 100 parts base asphalt, 7-15 parts SBS, 2-4 parts polyether-ester block copolymer (PE-b-PET), 1-2 parts triethanolamine borate, 1.5-3.0 parts Gemini dicationic emulsifier, and 60-75 parts deionized water. This invention utilizes an amphiphilic polyether-ester block copolymer to provide hydrophilic sites, triethanolamine borate to achieve sulfur-free, mild, and dynamic crosslinking, and Gemini dicationic emulsifier to give the high-content SBS base asphalt excellent emulsifability. The emulsified asphalt prepared by this invention exhibits a 5-day storage stability ≤1.0%, an evaporation residue softening point ≥90℃, a ductility ≥40cm at 5℃, a dynamic viscosity >200,000 Pa·s at 60℃, and an elastic recovery ≥95%. This invention solves the industry problems of traditional high-content SBS modified asphalt being difficult to emulsify and having poor stability. The process is simple, green and environmentally friendly, highly efficient and controllable, and can be applied to cold-mixed and cold-laid ultra-thin wearing layers.

[0028] The raw materials used in the following examples are from the following sources: Base asphalt: Esso 70# heavy-duty road petroleum asphalt, penetration 60-80 (0.1mm).

[0029] SBS: Linear SBS produced by Sinopec Baling Petrochemical, model YH791-H, with a styrene content of 30% and a number-average molecular weight of 85,000.

[0030] Polyether-ester block copolymer: Produced by Sichuan Chenguang Kexin Plastics Co., Ltd., model TPEE40D, density: 1.05-1.08 g / cm³ 3 Melting point: 180-195℃.

[0031] Polybutylene terephthalate (PBT): Produced by Jiangsu Sanfangxiang Group Co., Ltd., model number JH9100, appearance is white semi-transparent granules, 25kg / bag, density: 1.32 g / cm³ 3 .

[0032] Polyurethane: Manufactured by Wanhua Chemical, model Wanthane® WHT-1185, melting point 190℃, tensile strength 45MPa, elongation at break 600%.

[0033] Triethanolamine borate: Produced by Dexu New Materials (Guangzhou) Co., Ltd., model number DX621, appearance is light yellow transparent viscous liquid, purity: ≥99%, packaging specification is 25kg / drum.

[0034] Sulfur: Sulfur stabilizer produced by Wuxi Huasheng Rubber New Material Co., Ltd., model IS-HD-7520, with a total sulfur content of 80%.

[0035] Gemini dual cationic emulsifier: Produced by Anhui Siyoupu Chemical Technology Co., Ltd., model number YJ-14-3, appearance is light yellow transparent liquid, active ingredient content ≥50%, alkyl chain is C14.

[0036] Dioctadecyl dimethyl ammonium chloride: Produced by Shandong Boxing County Haolong Chemical Co., Ltd., model number D1821, active ingredient content is 75wt%.

[0037] Alkylphenol polyoxyethylene ether: Produced by Haian Petrochemical Plant, Jiangsu Province, model OP-10 (industrial grade), packaged in 25kg / drum, active ingredient content: ≥99%.

[0038] Sodium dodecylbenzenesulfonate: Produced by Hubei Tuoyuan Fine Chemical Co., Ltd., model LAS-90, packaged in 25kg / bags, with an active ingredient content of ≥90%.

[0039] Example 1 This embodiment provides a high-content SBS modified emulsified asphalt, the formulation of which is shown in Table 1. The preparation method of the high-content SBS modified emulsified asphalt includes the following steps: (1) Heat the base asphalt to 180°C, add SBS and polyether-ester block copolymer, and stir for 40 min; raise the temperature to 185°C, add triethanolamine borate, and continue stirring for 30 min to obtain the parent asphalt; (2) Dissolve Gemini dual cationic emulsifier in deionized water, adjust the pH value to 11 with NaOH, and prepare a soap solution at 65°C; (3) The parent asphalt and soap solution are sheared and emulsified at 3000r / min for 5min, cooled and discharged to obtain high-content SBS modified emulsified asphalt.

[0040] Example 2 This embodiment provides a high-content SBS modified emulsified asphalt, the formulation of which is shown in Table 1. The preparation method of this embodiment is the same as that of Example 1.

[0041] Example 3 This embodiment provides a high-content SBS modified emulsified asphalt, the formulation of which is shown in Table 1. The preparation method of this embodiment is the same as that of Example 1.

[0042] Example 4 This embodiment provides a high-content SBS modified emulsified asphalt, the formulation of which is shown in Table 1. The preparation method of this embodiment is the same as that of Example 1.

[0043] Example 5 This embodiment provides a high-content SBS modified emulsified asphalt, the formulation of which is shown in Table 1. The preparation method of this embodiment is the same as that of Example 1.

[0044] Comparative Example 1 This comparative example provides a high-content SBS modified emulsified asphalt, the formulation of which is shown in Table 1. The preparation method of this comparative example is the same as that of Example 1.

[0045] Comparative Example 2 This comparative example provides a high-content SBS modified emulsified asphalt, the formulation of which is shown in Table 1. The preparation method of this comparative example is the same as that of Example 1.

[0046] Comparative Example 3 This comparative example provides a high-content SBS modified emulsified asphalt, the formulation of which is shown in Table 1. The preparation method of this comparative example is the same as that of Example 1.

[0047] Table 1 shows the formulations of Examples 1-5 and Comparative Examples 1-3.

[0048]

[0049] Comparative Example 4 This comparative example provides a high-content SBS-modified emulsified asphalt, which is largely the same as Example 1, except that an equal mass of polyether-ester block copolymer is replaced with polybutylene terephthalate (PBT).

[0050] Comparative Example 5 This comparative example provides a high-content SBS-modified emulsified asphalt, which is largely the same as Example 1, except that an equal mass of polyether-ester block copolymer is used instead of polyurethane.

[0051] Comparative Example 6 This comparative example provides a high-content SBS modified emulsified asphalt, which is largely the same as Example 1, except that an equal mass of triethanolamine borate is replaced with sulfur.

[0052] Comparative Example 7 This comparative example provides a high-dosage SBS-modified emulsified asphalt, which is largely the same as Example 1, except that an equal mass of Gemini biscationic emulsifier is replaced with another biscationic emulsifier (bisoctadecyl dimethyl ammonium chloride).

[0053] Comparative Example 8 This comparative example provides a high-dosage SBS-modified emulsified asphalt, which is largely the same as Example 1, except that an equal mass of Gemini biscationic emulsifier is replaced with a nonionic emulsifier (alkylphenol polyoxyethylene ether emulsifier).

[0054] Comparative Example 9 This comparative example provides a high-dosage SBS-modified emulsified asphalt, which is largely the same as Example 1, except that an equal mass of Gemini biscationic emulsifier is replaced with an anionic emulsifier (sodium dodecylbenzenesulfonate).

[0055] The high-SBS modified emulsified asphalt prepared in the above embodiments and comparative examples were subjected to the following tests: Refer to the test indicators in the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" JTG 3410-2025; Storage stability test: T 0655-1993; Evaporation residue test: T 0669-2025; Asphalt softening point: T 0606-2011; Ductility at 5℃: T 0605-2011; Elastic recovery at 25℃: T 0662-2000; Dynamic viscosity at 60℃: T 0620-2025.

[0056] The test results are shown in Table 2 below.

[0057] Table 2 shows the test results of Examples 1-5 and Comparative Examples 1-9.

[0058]

[0059] As shown in Table 2, it can be seen from Examples 1-5 that the high-content SBS modified emulsified asphalt prepared by the present invention has excellent storage stability, with a 5-day storage stability ≤1.0%, a softening point of the emulsified asphalt evaporation residue >90℃, a ductility at 5℃ >40cm, an elastic recovery >95%, and a dynamic viscosity at 60℃ >200000 Pa·s. It meets the requirements for use in cold-mixed and cold-laid ultra-thin wearing layers with a thickness of 0.5~0.8cm.

[0060] The comparisons between Comparative Example 1 and Example 1, Comparative Example 4 and Example 1, and Comparative Example 5 and Example 1 show that the reduction or replacement of polyether-ester block copolymers in the parent asphalt significantly affects the performance indicators of the modified emulsified asphalt.

[0061] The comparison between Comparative Example 2 and Example 1 shows that SBS as a base modifier, when added in amounts less than 7 parts, has a significant impact on the asphalt properties of the evaporation residue (especially softening point, elastic recovery, and dynamic viscosity). Although Comparative Example 2 has better storage stability, its softening point, elastic recovery, and dynamic viscosity are lower, which cannot meet the requirements for the use of ultra-thin wear-resistant layers.

[0062] The comparison between Comparative Example 3 and Example 1, and between Comparative Example 5 and Example 1, shows that triethanolamine borate ester plays an indispensable role as a crosslinking agent in the parent asphalt. Reducing or replacing it with other crosslinking agents will significantly affect the performance indicators of the modified emulsified asphalt.

[0063] As can be seen from the comparison between Comparative Examples 6-8 and Example 1, the role of Gemini biscationic emulsifier in this invention is irreplaceable, and other emulsifiers cannot achieve the same effect as this invention.

[0064] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A high-content SBS-modified emulsified asphalt, characterized in that, Included by weight: 100 parts base bitumen, 7-15 parts SBS, 2-4 parts polyether-ester block copolymer, 1-2 parts triethanolamine borate, 1.5-3.0 parts Gemini biscationic emulsifier, and 60-75 parts deionized water.

2. The high-content SBS modified emulsified asphalt according to claim 1, characterized in that, The SBS is linear SBS with a styrene content of 28-32 wt% and a number-average molecular weight of 70,000-120,000.

3. The high-content SBS modified emulsified asphalt according to claim 1, characterized in that, The polyether-ester block copolymer is a polyester hard-segment-polyether soft-segment diblock or multiblock thermoplastic elastomer; The density of the polyether-ester block copolymer is 1.03~1.10 g / cm³. 3 Its melting point is 160~210℃.

4. The high-content SBS modified emulsified asphalt according to claim 1, characterized in that, The triethanolamine borate ester has the molecular formula C6H. 12 BNO3, with an effective content ≥98% and a density of 1.08~1.15 g / cm³. 3 Thermal decomposition temperature ≥210℃.

5. The high-content SBS modified emulsified asphalt according to claim 1, characterized in that, The Gemini biscationic emulsifier is a bisquaternary ammonium salt type Gemini cationic surfactant. The molecule contains a bishydrophilic quaternary ammonium group, a bislong-chain alkyl hydrophobic group and a flexible linker. The alkyl chain is C12~C16.

6. The high-content SBS modified emulsified asphalt according to claim 1, characterized in that, The high-content SBS modified emulsified asphalt has a pH of 9-12 and a 5-day storage stability of ≤1.0%.

7. A method for preparing high-content SBS modified emulsified asphalt as described in any one of claims 1-6, characterized in that, Includes the following steps: (1) Heat the base asphalt to 175-185℃, add SBS and polyether-ester block copolymer, stir for 40-60 min; raise the temperature to 180-190℃, add triethanolamine borate, and continue stirring for 30-40 min to obtain the parent asphalt. (2) Dissolve Gemini dual cationic emulsifier in deionized water and adjust the pH value with NaOH to prepare a soap solution at 55-75℃; (3) The parent asphalt and soap solution are emulsified by high-speed shearing at 2000-4000r / min for 5-10min, cooled and discharged to obtain high-content SBS modified emulsified asphalt.

8. The preparation method according to claim 7, characterized in that, In step (2), NaOH is used to adjust the pH value to 9-12.

9. The application of high-content SBS modified emulsified asphalt as described in any one of claims 1-6 in cold-mixed, cold-laid ultra-thin wearing course.

10. The application according to claim 9, characterized in that, The thickness of the ultrathin wear layer is 0.5~0.8cm.

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