High-viscosity rubber modified asphalt and preparation method thereof

Abstract

The invention belongs to the technical field of asphalt processing, and discloses high-viscosity rubber modified asphalt and a preparation method thereof.The high-viscosity rubber modified asphalt is prepared from 70 # matrix asphalt, graded vulcanized rubber powder, a linear SBS polymer, C5 petroleum resin type terpene resin, cycloalkane oil, polyisobutene modified nano-zinc oxide and a sulfur cross-linking stabilizer; by combining a three-dimensional network structure formed by the cross-linking stabilizer, the layering risk caused by density difference is remarkably reduced, the factory production and transportation period is prolonged, the anti-aging performance is further improved through the synergistic effect of the nanometer material and vulcanization, the asphalt is endowed with better elastic recovery and anti-fatigue capacity, and the service life of the asphalt is prolonged. And the whole formula breaks through the limitation of the mixing amount of the traditional rubber powder, the fluidity of the mixture is optimized while the high viscoelastic characteristic is ensured, the problems of wheel sticking during paving and non-uniform void ratio are solved, the construction efficiency and the pavement durability are considered, and the efficient cyclic utilization of waste rubber resources is promoted.

Description

Technical Field

[0001] The present invention belongs to the technical field of asphalt production, and specifically relates to a high-viscosity rubber-modified asphalt and a preparation method thereof. Background Art

[0002] Rubber-modified asphalt is made by adding a certain proportion of waste rubber particles or rubber powder, then fusing and modifying the rubber with asphalt through a process involving high-temperature melting and shear mixing. Rubber-modified asphalt exhibits excellent high-temperature stability, fatigue resistance, and rutting resistance, effectively improving the pavement's resistance to cracking, wear, and aging. The addition of rubber enhances the asphalt's toughness and elasticity, making it adaptable to complex climates and traffic conditions. It is particularly suitable for areas with heavy traffic and significant climate change. The use of rubber-modified asphalt not only extends the life of roads and reduces maintenance costs, but also effectively utilizes waste rubber, achieving the dual benefits of resource recovery and environmental protection.

[0003] Conventional rubber-modified asphalt is prone to poor storage stability during production and use, primarily manifested by phase separation (segregation) between the rubber powder and the asphalt. This is due to the lack of compatibility between the rubber powder and asphalt. At high temperatures, the rubber powder particles gradually sink or aggregate due to density differences, leading to stratification of the modified asphalt system. For example, traditional rubber asphalt requires continuous stirring at temperatures of 190-200°C, but even under these conditions, its shelf life exceeds four hours, making it impractical for factory production and long-distance transportation. Furthermore, excessive rubber powder content (e.g., exceeding 20%) increases the system's viscosity, further reducing storage stability.

[0004] The high-temperature viscosity of conventional rubber-modified asphalt is significantly higher than that of ordinary asphalt (e.g., the kinematic viscosity at 177°C can reach 1.5-4.0 Pa.s), making mixing and paving the mixture more difficult. For example, when the rubber powder content reaches 15%-22% in traditional processes, the oil-to-stone ratio of the mixture needs to be increased to approximately 8%, far exceeding the 5%-6% of ordinary asphalt. High viscosity also results in excessive asphalt film thickness, poor mixture fluidity, and defects such as wheel sticking and uneven porosity during rolling. Furthermore, the volatilization of residual solvents in the rubber powder at high temperatures can pose a fire risk (for example, when the rubber powder content exceeds 10%). Summary of the Invention

[0005] The object of the present invention is to provide a high-viscosity rubber-modified asphalt and a preparation method thereof to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above object, the present invention provides the following technical solution: a high-viscosity rubber-modified asphalt, comprising the following materials: No. 70 base asphalt, graded vulcanized rubber powder, linear SBS polymer, C5 petroleum resin type terpene resin, cycloparaffin oil, polyisobutylene modified nano zinc oxide, sulfur cross-linking stabilizer, the No. 70 base asphalt ratio range is 70-80%, preferably 75%, the graded vulcanized rubber powder ratio range is 18-25%, preferably 20 %, the ratio of the linear SBS polymer is in the range of 4-6%, preferably 5%, the ratio of the C5 petroleum resin type terpene resin is in the range of 3-5%, preferably 3%, the ratio of the cycloparaffin oil is in the range of 1.5-2.5%, preferably 2%, the ratio of the polyisobutylene modified nano zinc oxide is in the range of 0.4-0.6%, preferably 0.5%, and the ratio of the sulfur cross-linking stabilizer is in the range of 0.1-0.3%, preferably 0.2%.

[0007] As a further technical solution of the present invention, the No. 70 matrix asphalt is the basic bonding material, the graded vulcanized rubber powder is a 40-60 mesh non-single particle size rubber powder, which has been pre-swelling treated and has both modification and filling effects, and the linear SBS polymer is used to improve high and low temperature performance and cooperates with the rubber powder to form a cross-linked network structure.

[0008] As a further technical solution of the present invention, the C5 petroleum resin-type terpene resin is used as a tackifier to improve viscosity and weather resistance and enhance compatibility with SBS polymer. The cycloalkane oil is used as a pre-swelling agent to reduce the interfacial tension between the rubber powder and asphalt and improve dispersibility. The polyisobutylene-modified nano zinc oxide is used as an activator to promote the interfacial reaction between the rubber powder and asphalt and enhance the anti-aging performance. The sulfur cross-linking stabilizer is used to enhance the stability of the polymer network and inhibit segregation during storage.

[0009] A method for preparing high-viscosity rubber-modified asphalt comprises the following steps: S1: material pretreatment; S2: matrix asphalt pretreatment; S3: staged shearing process; S4: Finished product quality control; S5: Performance indicators and verification; The material pretreatment includes rubber powder pre-swelling and rubber powder activation, the staged shear process includes primary shear dispersion and composite modified shear and cross-linking stabilization treatment, and the finished product quality control includes viscosity testing and storage stability verification.

[0010] As a further technical solution of the present invention, the rubber powder pre-swelling includes mixing 40-60 mesh graded vulcanized rubber powder at a mass ratio of 18-20% with cycloparaffin oil at a mass ratio of 2%, and swelling at a constant temperature of 60°C for 6 hours to make the volume expansion rate of the rubber powder reach more than 30%. The rubber powder activation includes adding polyisobutylene-modified nano-zinc oxide at a mass ratio of 0.5% to the pre-swelling rubber powder, and using 800W microwave-assisted heating for 120 seconds to accelerate the vulcanization reaction.

[0011] As a further technical solution of the present invention, the matrix asphalt pretreatment includes selecting No. 70 matrix asphalt at a mass ratio of 75%, heating it to 170°C and keeping it warm to ensure that the fluidity meets the subsequent mixing requirements.

[0012] As a further technical solution of the present invention, the primary shear dispersion includes heating the pretreated matrix asphalt to 180°C, adding activated rubber powder, and shearing at a low speed of 1500r / min for 30 minutes to achieve uniform dispersion of the rubber powder. The composite modified shear includes adding a linear SBS polymer at a mass ratio of 5% and a C5 petroleum resin type terpene resin at a mass ratio of 3%, heating to 185°C, and shearing at a high speed of 5000r / min for 60 minutes to form a uniform cross-linking system. The cross-linking stabilization treatment includes adding a sulfur cross-linking agent at a mass ratio of 0.2%, and developing at a low speed of 1500r / min for 2 hours to eliminate bubbles and stabilize the network structure.

[0013] As a further technical solution of the present invention, the viscosity test includes using a Brookfield viscometer SC4-27 rotor to test the 180°C rotational viscosity, requiring the rotational viscosity to be 1.2-1.5 Pa.s; the storage stability verification includes allowing the finished asphalt to stand at 170-180°C for 48 hours, requiring the softening point difference between the upper and lower layers to be ≤2.5°C.

[0014] As a further technical solution of the present invention, the performance indicators and verification include high viscoelasticity, anti-segregation and construction adaptability. The indicator of high viscoelasticity is dynamic viscosity ≥25000Pa.s at 60°C, the indicator of anti-segregation is softening point difference in segregation test <3°C, the construction adaptability is viscosity 1.2-1.5Pa.s at 180°C to meet paving requirements, and the rolling temperature window is 160-170°C.

[0015] The beneficial effects of the present invention are as follows: (1) The present invention significantly improves the storage stability and construction adaptability of the material through multi-component synergistic modification technology. The introduction of innovative thickeners and activators effectively regulates the interfacial compatibility between rubber powder and asphalt, inhibits the phase separation phenomenon during high-temperature storage, and ensures the long-term homogeneity and stability of the modified system. The optimized rubber powder pre-swelling process enhances its dispersibility. Combined with the three-dimensional network structure formed by the cross-linking stabilizer, it significantly reduces the risk of stratification caused by density differences and extends the factory production and transportation cycle. The synergistic effect of nanomaterials and vulcanization further improves the anti-aging performance, giving asphalt better elastic recovery and fatigue resistance, adapting to the complex mechanical environment under heavy traffic and extreme climates. The overall formula breaks through the traditional rubber powder dosage limit, optimizes the fluidity of the mixture while ensuring high viscoelastic properties, reduces the problems of paving wheel sticking and uneven porosity, takes into account both construction efficiency and road durability, and promotes the efficient recycling of waste rubber resources.

[0016] (2) The present invention realizes precise control of material properties and upgrades engineering applicability through staged shearing and dynamic cross-linking control. Pre-swelling and microwave activation technology strengthens the interfacial reaction activity between rubber powder and asphalt, and combines with multi-stage shearing process to form a homogeneous and stable cross-linking network, which significantly improves the mechanical properties and environmental tolerance of modified asphalt. The dynamic shearing strategy balances the viscosity and dispersion effect of the system, solves the mixing and paving problems caused by high viscosity of traditional processes, widens the construction temperature window, and strictly controls the quality of finished products to ensure that the material maintains uniform performance after standing at high temperature, reducing the risk of construction defects. This technical solution breaks through the bottleneck of short storage period and poor construction adaptability of traditional modified asphalt, and provides high-grade roads with green paving materials that have high stability, low maintenance cost and long life, promoting the transformation of road engineering towards resource recycling and low carbon. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the overall preparation method of the present invention; Figure 2 This is a schematic diagram of the process of material pretreatment of the present invention; Figure 3 Schematic diagram of the process of the staged shearing process of the present invention; Figure 4 Schematic diagram of the process of quality control of finished products of the present invention. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] like Figures 1 to 4 As shown, in an embodiment of the present invention, a high-viscosity rubber-modified asphalt comprises the following materials: No. 70 base asphalt, graded vulcanized rubber powder, linear SBS polymer, C5 petroleum resin type terpene resin, cycloparaffin oil, polyisobutylene modified nano zinc oxide, and sulfur cross-linking stabilizer. The ratio of No. 70 base asphalt is in the range of 70-80%, preferably 75%, the ratio of graded vulcanized rubber powder is in the range of 18-25%, preferably 20%, the ratio of linear SBS polymer is in the range of 4-6%, preferably 5%, the ratio of C5 petroleum resin type terpene resin is in the range of 3-5%, preferably 3%, the ratio of cycloparaffin oil is in the range of 1.5-2.5%, preferably 2%, the ratio of polyisobutylene modified nano zinc oxide is in the range of 0.4-0.6%, preferably 0.5%, and the ratio of sulfur cross-linking stabilizer is in the range of 0.1-0.3%, preferably 0.2%.

[0020] The synergistic effect of multiple components significantly enhances the overall material performance. Vulcanized rubber powder undergoes pre-swelling and activation treatments to form a stable interface with the matrix asphalt, effectively inhibiting segregation and enhancing fatigue resistance. Linear SBS and terpene resins are compositely modified to create a three-dimensional crosslinked network, imparting excellent high-temperature deformation resistance and low-temperature crack resistance to the asphalt. Cycloalkane oil improves the dispersibility of the rubber powder and reduces system viscosity, ensuring ease of construction and workability. Nano-zinc oxide delays aging through interfacial activation, while sulfur crosslinking strengthens the polymer network stability. The overall material maintains high viscoelasticity while combining storage stability and construction adaptability. It significantly improves the pavement's resistance to rutting, reflective cracking, and water damage, extending road service life and making it suitable for durable paving projects under high loads and complex climatic conditions.

[0021] Among them, No. 70 matrix asphalt is the basic bonding material, the graded vulcanized rubber powder is 40-60 mesh non-single particle size rubber powder, which has been pre-swelling treated and has both modification and filling functions. The linear SBS polymer is used to improve high and low temperature performance and cooperates with the rubber powder to form a cross-linked network structure.

[0022] The synergistic effect of multiple components significantly improves road performance. The base asphalt provides fundamental bonding strength, forming a dense interface with the pre-swelled rubber powder, enhancing fatigue and deformation resistance. The optimized gradation of the rubber powder effectively fills microscopic voids, improves stress distribution, and slows crack propagation. The synergistic crosslinking of the linear polymer and the rubber powder creates a stable three-dimensional network, endowing the material with excellent high-temperature rutting resistance and low-temperature crack resistance. The dispersion and crosslinking of the active ingredients within the system enhance the viscoelastic balance, ensuring satisfactory fluidity during construction while maintaining long-term structural stability.

[0023] Among them, C5 petroleum resin type terpene resin is used as a thickener to improve viscosity and weather resistance and enhance compatibility with SBS polymer. Cycloalkane oil is used as a pre-swelling agent to reduce the interfacial tension between rubber powder and asphalt and improve dispersibility. Polyisobutylene modified nano zinc oxide is used as an activator to promote the interfacial reaction between rubber powder and asphalt and enhance anti-aging performance. Sulfur cross-linking stabilizer is used to enhance the stability of the polymer network and inhibit segregation during storage.

[0024] Through the precise synergy of functional components, viscosity control and long-term stability are achieved. Tackifying resins enhance high-temperature adhesion and weather resistance, optimize interpolymer molecular chain entanglement, and improve shear resistance under dynamic loads. Pre-swelling agents promote uniform dispersion of rubber powder by regulating interfacial tension, avoiding performance fluctuations caused by localized agglomeration. Nanoactivators accelerate interfacial reactions to form a dense bond, blocking UV and oxidative corrosion pathways and slowing material performance degradation. Cross-linking stabilizers solidify the three-dimensional network structure, inhibiting component delamination during storage and ensuring performance uniformity. The overall formula optimizes viscoelastic balance, anti-aging properties, and construction adaptability, imparting asphalt with lasting resistance to deformation, fatigue, and environmental tolerance, making it suitable for long-term protection of high-load and extreme climate pavement.

[0025] A method for preparing high-viscosity rubber-modified asphalt comprises the following steps: S1: material pretreatment; S2: matrix asphalt pretreatment; S3: staged shearing process; S4: Finished product quality control; S5: Performance indicators and verification; Material pretreatment includes rubber powder pre-swelling and rubber powder activation. The staged shear process includes primary shear dispersion, composite modified shear, and cross-linking stabilization treatment. Finished product quality control includes viscosity testing and storage stability verification.

[0026] Through systematic process design, we achieve in-depth optimization of material properties. Pretreatment enhances the activity and dispersion efficiency of the rubber powder, preventing storage segregation. The segmented shearing process precisely controls the microstructure, forming a uniform and stable cross-linked network and enhancing high-temperature deformation resistance and low-temperature crack resistance. Dynamic viscosity testing and stability verification ensure the homogeneity and reliability of the finished product, meeting stringent construction requirements. This multi-stage synergistic effect imparts asphalt with excellent viscoelastic balance, aging resistance, and fatigue resistance, while also balancing storage stability and construction adaptability, significantly improving the pavement's resistance to rutting, water damage, and dynamic loads.

[0027] like Figure 2As shown in FIG, the rubber powder pre-swelling includes mixing 40-60 mesh graded vulcanized rubber powder in a mass ratio of 18-20% with cycloparaffin oil in a mass ratio of 2%, and swelling at a constant temperature of 60° C. for 6 hours to make the volume expansion rate of the rubber powder reach more than 30%. The rubber powder activation includes adding polyisobutylene modified nano zinc oxide in a mass ratio of 0.5% to the pre-swelled rubber powder, and using 800W microwave-assisted heating for 120 seconds to accelerate the vulcanization reaction.

[0028] Through volume expansion and interface optimization, the compatibility between rubber powder and asphalt is significantly improved, eliminating the risk of segregation caused by density differences. Activation treatment, utilizing nanomaterials and energy to assist in accelerating the vulcanization process, enhances the surface activity and aging resistance of the rubber powder. These two factors work together to form a dense and stable rubber-asphalt interface, imparting homogeneous dispersion and fatigue resistance to the material while simultaneously suppressing performance degradation during storage. This lays the microstructural foundation for subsequent shearing processes, ensuring the finished product possesses both high viscoelasticity and workability.

[0029] Among them, the matrix asphalt pretreatment includes selecting No. 70 matrix asphalt at a mass ratio of 75%, heating it to 170°C and keeping it warm to ensure that the fluidity meets the subsequent mixing requirements.

[0030] Precise temperature control optimizes initial fluidity, ensures efficient integration with modified components, eliminates interfacial defects, and lays the foundation for building a homogeneous system. Its stable thermal state promotes the subsequent uniform dispersion of rubber powder and polymer, improves cross-linking reaction efficiency, and ultimately enhances the synergistic properties of asphalt's high-temperature deformation resistance and low-temperature cracking resistance.

[0031] like Figure 3 As shown, the primary shear dispersion includes heating the pretreated matrix asphalt to 180°C, adding activated rubber powder, and shearing at a low speed of 1500 r / min for 30 minutes to achieve uniform dispersion of the rubber powder. The composite modified shear includes adding linear SBS polymer at a mass ratio of 5% and C5 petroleum resin type terpene resin at a mass ratio of 3%, heating to 185°C, and high-speed shearing at 5000 r / min for 60 minutes to form a uniform cross-linking system. The cross-linking stabilization treatment includes adding sulfur cross-linking agent at a mass ratio of 0.2%, and developing at a low speed of 1500 r / min for 2 hours to eliminate bubbles and stabilize the network structure.

[0032] By dynamically manipulating the microstructure, synergistic performance enhancement is achieved. Primary shear promotes uniform dispersion of the rubber powder and forms a dense bonding interface, eliminating agglomeration defects. Composite modified shear drives the directional alignment and crosslinking of polymer chains, creating a high-temperature stable and low-temperature flexible three-dimensional network. Crosslinking stabilizes the cured structure, inhibiting internal stress concentration and microcrack initiation. These processes synergistically enhance viscoelasticity, fatigue resistance, and durability, ensuring the material maintains structural integrity under complex loads while maintaining fluidity during construction.

[0033] like Figure 4The viscosity test includes using a Brookfield viscometer SC4-27 rotor to test the 180°C rotational viscosity, requiring the rotational viscosity to be 1.2-1.5 Pa.s. The storage stability verification includes leaving the finished asphalt at 170-180°C for 48 hours, requiring the softening point difference between the upper and lower layers to be ≤2.5°C.

[0034] By precisely controlling high-temperature fluidity, we ensure that the asphalt possesses appropriate adhesion and paving ductility during construction, preventing mixture agglomeration or adhesion failure due to excessively high or low viscosity. Storage stability verification simulates long-term static conditions to verify the material's resistance to segregation, inhibit rubber powder settling and component stratification, and ensure homogeneity and consistent performance of the finished product. The synergistic effect of these two methods eliminates the risk of quality fluctuations at the source of the process, ensuring that the asphalt maintains stable viscoelastic properties and deformation resistance under complex working conditions. This provides reliable protection for the pavement's resistance to rutting, water damage, and fatigue, thereby extending the service life of the pavement structure.

[0035] Among them, the performance indicators and verification include high viscoelasticity, anti-segregation and construction adaptability. The indicator of high viscoelasticity is dynamic viscosity ≥25000Pa.s at 60℃, the indicator of anti-segregation is softening point difference of segregation test <3℃, construction adaptability is viscosity of 1.2-1.5Pa.s at 180℃ to meet paving requirements, and the rolling temperature window is 160-170℃.

[0036] Through the coordinated control of multiple indicators, the material is endowed with comprehensive and balanced road performance. High viscoelasticity ensures rutting resistance at high temperatures and efficient energy dissipation under dynamic loads, significantly suppressing permanent pavement deformation. Segregation resistance ensures homogeneous and stable components during storage and construction, preventing localized performance degradation. Optimized construction viscosity and temperature windows enhance paving density and rolling compaction, reducing uneven porosity. Comprehensive verification results ensure that asphalt possesses both structural strength and durability, maintaining resistance to cracking, spalling, and fatigue under harsh climates and heavy loads.

[0037] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-viscosity rubber-modified asphalt, characterized by: The invention comprises the following materials: No. 70 matrix asphalt, graded vulcanized rubber powder, linear SBS polymer, C5 petroleum resin type terpene resin, cycloparaffin oil, polyisobutylene modified nano zinc oxide, and sulfur cross-linking stabilizer. The proportion of the No. 70 matrix asphalt is in the range of 70-80%, preferably 75%, the proportion of the graded vulcanized rubber powder is in the range of 18-25%, preferably 20%, the proportion of the linear SBS polymer is in the range of 4-6%, preferably 5%, the proportion of the C5 petroleum resin type terpene resin is in the range of 3-5%, preferably 3%, the proportion of the cycloparaffin oil is in the range of 1.5-2.5%, preferably 2%, the proportion of the polyisobutylene modified nano zinc oxide is in the range of 0.4-0.6%, preferably 0.5%, and the proportion of the sulfur cross-linking stabilizer is in the range of 0.1-0.3%, preferably 0.2%.

2. The high-viscosity rubber-modified asphalt according to claim 1, characterized in that: The No. 70 matrix asphalt is the basic bonding material, the graded vulcanized rubber powder is a 40-60 mesh non-single particle size rubber powder, which has been pre-swelling treated and has both modification and filling functions. The linear SBS polymer is used to improve high and low temperature performance and cooperates with the rubber powder to form a cross-linked network structure.

3. The high-viscosity rubber-modified asphalt according to claim 1, characterized in that: The C5 petroleum resin-type terpene resin acts as a tackifier to improve viscosity and weather resistance and enhance compatibility with SBS polymer. The cycloparaffin oil acts as a pre-swelling agent to reduce the interfacial tension between the rubber powder and asphalt and improve dispersibility. The polyisobutylene-modified nano zinc oxide acts as an activator to promote the interfacial reaction between the rubber powder and asphalt and enhance anti-aging performance. The sulfur cross-linking stabilizer is used to enhance the stability of the polymer network and inhibit segregation during storage.

4. The method for preparing high-viscosity rubber-modified asphalt according to claim 1, wherein: The following steps are involved: S1: material pretreatment; S2: matrix asphalt pretreatment; S3: staged shearing process; S4: Finished product quality control; S5: Performance indicators and verification; The material pretreatment includes rubber powder pre-swelling and rubber powder activation, the staged shear process includes primary shear dispersion and composite modified shear and cross-linking stabilization treatment, and the finished product quality control includes viscosity testing and storage stability verification.

5. The high-viscosity rubber-modified asphalt and the preparation method thereof according to claim 4, characterized in that: The rubber powder pre-swelling comprises mixing 40-60 mesh graded vulcanized rubber powder in a mass ratio of 18-20% with cycloparaffin oil in a mass ratio of 2%, and swelling the mixture at a constant temperature of 60° C. for 6 hours to achieve a volume expansion rate of the rubber powder of more than 30%. The rubber powder activation comprises adding polyisobutylene-modified nano-zinc oxide in a mass ratio of 0.5% to the pre-swelled rubber powder, and accelerating the vulcanization reaction by using 800W microwave-assisted heating for 120 seconds.

6. The high-viscosity rubber-modified asphalt and the preparation method thereof according to claim 4, characterized in that: The matrix asphalt pretreatment includes selecting No. 70 matrix asphalt at a mass ratio of 75%, heating it to 170°C and keeping it warm to ensure that the fluidity meets the subsequent mixing requirements.

7. The high-viscosity rubber-modified asphalt and the preparation method thereof according to claim 4, characterized in that: The primary shear dispersion includes heating the pretreated base asphalt to 180°C, adding activated rubber powder, and shearing at a low speed of 1500r / min for 30 minutes to achieve uniform dispersion of the rubber powder. The composite modified shear includes adding a linear SBS polymer at a mass ratio of 5% and a C5 petroleum resin type terpene resin at a mass ratio of 3%, heating to 185°C, and shearing at a high speed of 5000r / min for 60 minutes to form a uniform cross-linking system. The cross-linking stabilization treatment includes adding a sulfur cross-linking agent at a mass ratio of 0.2%, and developing at a low speed of 1500r / min for 2 hours to eliminate bubbles and stabilize the network structure.

8. The high-viscosity rubber-modified asphalt and the preparation method thereof according to claim 4, characterized in that: The viscosity test includes using a Brookfield viscometer SC4-27 rotor to test the rotational viscosity at 180°C, requiring the rotational viscosity to be 1.2-1.5 Pa.s. The storage stability verification includes allowing the finished asphalt to stand at 170-180°C for 48 hours, requiring the softening point difference between the upper and lower layers to be ≤2.5°C.

9. The high-viscosity rubber-modified asphalt and the preparation method thereof according to claim 4, characterized in that: The performance indicators and verification include high viscoelasticity, anti-segregation and construction adaptability. The indicator of high viscoelasticity is dynamic viscosity ≥25000Pa.s at 60℃, the indicator of anti-segregation is softening point difference in segregation test <3℃, the construction adaptability is viscosity 1.2-1.5Pa.s at 180℃ to meet paving requirements, and the rolling temperature window is 160-170℃.

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