High-tack high-elastic modified asphalt, and preparation method and application thereof

Abstract

The application belongs to the technical field of road engineering asphalt material, and particularly relates to high-viscosity and high-elasticity modified asphalt as well as a preparation method and application thereof. The high-viscosity and high-elasticity modified asphalt comprises the following components in parts by weight: 100 parts of base asphalt, 6-10 parts of SBS, 2-4 parts of polyetherimide-zinc ion coordination elastomer (PEI-Zn), 4-8 parts of perfluoropolyether (PFPE), 1-2 parts of di(tert-butyl peroxyisopropyl) benzene (BIPB), and 0.8-1.5 parts of nano silicon carbide. The high-viscosity and high-elasticity modified asphalt is modified in multiple dimensions by using ion crosslinking elastomer, perfluoropolyether, peroxide crosslinking agent and nano inorganic filler, so that the performance index of the high-viscosity and high-elasticity modified asphalt is greatly improved, the use requirement of a 0.8-1.5 cm thick ultra-thin wearing layer is met, and the high-viscosity and high-elasticity modified asphalt is used for preventive maintenance of a bridge deck and a tunnel.

Description

Technical Field

[0001] This invention relates to the field of asphalt materials technology for road engineering, and in particular to a high-viscosity, high-elasticity modified 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] The core material of ultra-thin wear-resistant decks is high-viscosity, high-elasticity modified asphalt. Its high viscosity, high elasticity, high toughness, and excellent aging and wear resistance are crucial for ensuring the performance and service life of ultra-thin wear-resistant decks. The thinner the ultra-thin wear-resistant deck, the higher the performance requirements for the asphalt binder—the asphalt binder must possess sufficient bond strength, elastic recovery capacity, and aging resistance to ensure that the ultra-thin wear-resistant deck maintains structural integrity and good functionality under repeated traffic loads.

[0004] Currently, preventive maintenance of asphalt pavements on highways generally uses ultra-thin wearing courses with a thickness of 1.5cm to 2.0cm. The high-viscosity modified asphalt in the existing specifications can barely meet the requirements. However, for bridge decks and tunnels, considering the dead load of bridges and the clearance of tunnels, ultra-thin wearing courses with a thickness of 0.8cm to 1.5cm are usually used. The high-viscosity modified asphalt in the existing specifications can no longer meet the requirements, mainly in the following ways: insufficient bond strength, which easily leads to loosening and particle shedding; poor low-temperature ductility and elastic recovery ability, which easily leads to reflective cracking; and limited aging resistance, with performance degradation too fast after long-term use, which cannot support the long-term service requirements of the wearing course. Therefore, it is urgent to further improve the comprehensive performance indicators of asphalt binders.

[0005] Currently, conventional high-viscosity and high-elasticity modified asphalt mainly incorporates SBS, polyolefin materials, resins, rubber powder, aromatic oils, and sulfur, among other conventional materials. The modification approach primarily focuses on increasing the amount of modifier and optimizing the processing technology to improve asphalt performance. However, this method has reached a technical bottleneck: on the one hand, excessive modifier dosage not only significantly increases production costs but also substantially raises the risk of segregation in the modified asphalt, leading to unstable modification effects; on the other hand, conventional asphalt modification processes mainly rely on physical blending, involving only a small amount of chemical reaction in the crosslinking modification stage. The bond between the modifier and the asphalt matrix is ​​primarily physical, resulting in weak interfacial bonding. When the modifier dosage increases to a certain extent, the efficiency of the crosslinking reaction decreases significantly, easily causing polymerization, stratification, and uneven dispersion of the modifier, ultimately leading to a decline in the overall performance of the modified asphalt.

[0006] To address the problems with existing technologies, the industry has attempted to improve asphalt performance by using chemical modifiers, such as polyphosphoric acid, through chemical reactions during the modification process. However, existing chemical modification technologies still have significant limitations: most chemical modifiers can only specifically improve a single property of asphalt (such as only improving adhesion or only improving aging resistance), and cannot achieve simultaneous improvement in comprehensive properties such as high viscosity, high elasticity, high toughness, high ductility, and aging resistance; moreover, some chemical modifiers have poor compatibility with conventional modifiers (such as SBS), easily causing antagonistic reactions, damaging the stability of the modified system, and making it difficult to meet the high-performance requirements of ultra-thin wear-resistant layers.

[0007] In addition, the crosslinking agents used in existing modified asphalt are mostly sulfur, which has a fast crosslinking reaction, low crosslinking efficiency, and is prone to producing irritating odors, posing certain environmental problems; the fillers used are mostly ordinary micron-sized fillers, which have limited effect on improving the wear resistance and rutting resistance of asphalt, and are difficult to support the use requirements of thin and ultra-thin wear layers.

[0008] Therefore, developing a high-viscosity, high-elasticity modified asphalt that can overcome existing technological bottlenecks, achieve simultaneous improvement in comprehensive performance through component compounding and chemical synergistic modification, and has good compatibility, stable storage, simple preparation, and is suitable for use in ultra-thin wear layers of 0.8~1.5cm has become an urgent technical problem to be solved in the field of asphalt materials for road engineering. Summary of the Invention

[0009] The purpose of this invention is to solve the above problems by providing a high-viscosity, high-elasticity modified asphalt, its preparation method and application, and to provide a high-viscosity, high-elasticity modified asphalt for use in ultra-thin wear layers with a thickness of less than 1.5 cm.

[0010] The objective of this invention is achieved through the following technical solution: The first objective of this invention is to provide a high-viscosity, high-elasticity modified asphalt, which, by weight, comprises the following substances: 100 parts of base bitumen, 6-10 parts of SBS, 2-4 parts of polyetherimide-zinc ion coordination elastomer (PEI-Zn), 4-8 parts of perfluoropolyether (PFPE), 1-2 parts of di(tert-butylperoxyisopropyl)benzene (BIPB), and 0.8-1.5 parts of nano-silicon carbide.

[0011] Furthermore, the base asphalt is various petroleum asphalts with a penetration of 30-100 (0.1 mm), which is the most commonly used asphalt material in road engineering.

[0012] Furthermore, the SBS is linear SBS, wherein the styrene content is 28~32wt%.

[0013] Furthermore, the polyetherimide-zinc ion coordination elastomer (PEI-Zn) is a pale yellow transparent elastic particle with a coordination degree of 50%-70%, a number-average molecular weight of 10,000-20,000, a zinc ion content of 7%-11%, a glass transition temperature (Tg) ≥ 210℃, a thermal decomposition temperature ≥ 370℃, a tensile strength ≥ 32 MPa, a fracture strain ≥ 750%, and a density of 1.28~1.42 g / cm³. 3 .

[0014] Furthermore, the polyetherimide-zinc ion coordination elastomer (PEI-Zn) is synthesized by introducing sulfonic acid and carboxyl coordination sites onto the polyetherimide (PEI) chain, thereby enabling it to interact with Zn. 2+ Ionic crosslinked elastomers are obtained by forming a reversible ionic crosslinking network of zinc ions.

[0015] Furthermore, the polyetherimide-zinc ion coordination elastomer introduces sulfonic acid groups and / or carboxyl groups into the molecular chain of polyetherimide, and zinc ions form a reversible ionic crosslinking network to construct a flexible-rigid synergistic crosslinking structure in the asphalt system. This compensates for the insufficient crosslinking strength of pure linear SBS, significantly improving the cohesion, elastic recovery ability and overall toughness of asphalt. In addition, the introduced polar coordination groups can form hydrogen bonds and polar interactions with the asphalt resins and asphaltenes, strengthening the interfacial bonding between the polymer phase and the asphalt matrix, reducing the separation of the modifier phase and improving the storage stability of the system.

[0016] Furthermore, the perfluoropolyether (PFPE) is a special elastomer containing only C, F, and O elements in its molecule. It appears as a colorless, transparent liquid at room temperature, with a number-average molecular weight of 8000-12000, a glass transition temperature (Tg) ≤ -70℃, a long-term operating temperature of -80~280℃, and a density of 1.84~1.92 g / cm³. 3The kinematic viscosity at 20℃ is 160~220 mmHg. 2 / s, volatility (150℃, 24hr) ≤0.04%.

[0017] Furthermore, perfluoropolyethers have extremely low glass transition temperatures and highly flexible molecular chains, allowing them to disperse uniformly within the gaps of asphalt and the polymer cross-linking network. This provides a flexible plasticizer, significantly improving the low-temperature crack resistance of asphalt. It can also reduce the internal frictional resistance between the polymer chains in SBS and the polyetherimide-zinc ion-coordinated elastomer, enhancing the dispersion effect of the modifier and synergistically improving the viscosity and toughness of the asphalt. Simultaneously, the high bond energy of the fluorine-carbon bonds within the perfluoropolyether molecule and its strong chemical inertness effectively improve the aging resistance of the modified asphalt.

[0018] Furthermore, the bis(tert-butylperoxyisopropyl)benzene (BIPB) is a peroxide-based crosslinking agent, appearing as pale yellow granules with an active oxygen content ≥9%, a molecular weight of 338.5, and a density of 1.07~1.09 g / cm³. 3 Its thermal decomposition temperature is ≥180℃, and its melting point is 108~115℃.

[0019] Furthermore, di(tert-butylperoxyisopropyl)benzene is a high-temperature controllable peroxide crosslinking agent. At the asphalt modification temperature of 190~200℃, its decomposition rate is moderate and stable. It can slowly initiate free radical grafting and covalent crosslinking of molecular chains in SBS and polyetherimide-zinc ion coordination elastomer. The synergistic effect of the three significantly improves the stability of the three-dimensional network structure of asphalt and effectively avoids the problem of asphalt becoming brittle and having uneven performance due to excessively rapid crosslinking.

[0020] Furthermore, the nano-silicon carbide is a nanoscale inorganic filler, appearing as a grayish-black powder with a particle size of 20-50 nm, a purity ≥99.9%, a molecular weight of 40.10, and a density of 3.20~3.28 g / cm³. 3 Specific surface area is 50~100m² 2 / g.

[0021] Furthermore, ultrafine nano-silicon carbide particles (20~50nm) can uniformly fill the microscopic voids in asphalt colloids and polymer cross-linked networks, acting as a nano-skeleton filler, effectively improving the structural stability of the mixed system and significantly enhancing the high-temperature rutting resistance of asphalt. Simultaneously, the high specific surface area of ​​nano-silicon carbide can form strong interfacial adsorption with the polymer chains in the modifier and the polar components of asphalt, thereby improving the elasticity and viscosity-toughness of the asphalt.

[0022] A second objective of this invention is to provide a method for preparing high-viscosity, high-elasticity modified asphalt, the method comprising the following steps: Heat the asphalt to 185-190℃, add SBS, polyetherimide-zinc ion coordination elastomer, and perfluoropolyether according to the mass ratio, stir at a constant speed of 300-500 r / min for 30-40 min, and shear at a constant speed of 2000-3000 r / min for 30-40 min (shearing temperature maintained at 185-190℃). Then raise the asphalt temperature to 190-200℃, add di(tert-butylperoxyisopropyl)benzene, stir at a constant speed of 300-500 r / min for 40-60 min, and finally add nano-silicon carbide, stir at a constant speed of 300-500 r / min for 30-40 min to obtain the high-viscosity and high-elasticity modified asphalt.

[0023] The third objective of this invention is to provide an application of high-viscosity, high-elasticity modified asphalt in the preparation of ultrathin wear-resistant layers.

[0024] Furthermore, the ultra-thin wear layer is an ultra-thin wear layer with a thickness of less than 1.5 cm.

[0025] More preferably, the ultrathin wear layer is an ultrathin wear layer with a thickness of 0.8~1.5cm.

[0026] This invention belongs to the technical field of asphalt materials for road engineering, specifically relating to a high-viscosity, high-elasticity modified asphalt, its preparation method, and its application. The high-viscosity, high-elasticity modified asphalt comprises the following components in the indicated weight ratios: 100 parts base asphalt, 6-10 parts SBS, 2-4 parts polyetherimide-zinc ion coordination elastomer (PEI-Zn), 4-8 parts perfluoropolyether (PFPE), 1-2 parts di(tert-butylperoxyisopropyl)benzene (BIPB), and 0.8-1.5 parts nano-silicon carbide. This invention utilizes ion-crosslinked elastomers, perfluoropolyethers, peroxide-based crosslinking agents, and nanoscale inorganic fillers to achieve multi-dimensional modification through physical blending, chemical crosslinking, ion coordination, and interfacial reinforcement. This significantly improves the performance indicators of high-viscosity and high-elasticity modified asphalt, resulting in a softening point above 100℃, dynamic viscosity at 60℃ > 600,000 Pa·s, ductility at 5℃ > 50 cm, viscosity-toughness > 40 N·m, and a high-temperature PG grade of 100 or above. The asphalt exhibits excellent aging resistance and storage stability, meeting the requirements for ultra-thin wearing courses of 0.8~1.5 cm thickness, suitable for preventive maintenance of bridge decks and tunnels.

[0027] Compared with the prior art, the present invention has the following advantages: 1) This invention provides a high-viscosity and high-elasticity modified asphalt, its preparation method, and its application. It breaks through the limitations of traditional single physical blending modification and adopts a composite modification system of physical blending, chemical crosslinking, ion coordination, and interface reinforcement. Through the compounding of linear SBS, polyetherimide-zinc ion-coordinated elastomer, perfluoropolyether, di(tert-butylperoxyisopropyl)benzene, and nano-silicon carbide, the system works synergistically to simultaneously take into account high temperature, low temperature, viscosity, elasticity, toughness, and aging resistance, thus solving the problems of single performance and prominent shortcomings of conventional modified asphalt.

[0028] 2) This invention provides a high-viscosity and high-elasticity modified asphalt, its preparation method and application. By utilizing the high-temperature ionic crosslinking network of polyetherimide-zinc ion-coordinated elastomer, the covalent crosslinking of bis(tert-butylperoxyisopropyl)benzene and the reinforcement of nano-silicon carbide skeleton, the asphalt obtained has a softening point of over 100℃, a dynamic viscosity of over 600,000 Pa·s at 60℃, a high-temperature PG classification of ≥100, and a viscosity-toughness of >40 N·m. The high-temperature deformation resistance, viscosity and viscosity-toughness of the modified asphalt are greatly improved, which can meet the stringent requirements of ultra-thin wear layers of 0.8~1.5cm.

[0029] 3) This invention provides a high-viscosity, high-elasticity modified asphalt, its preparation method, and its application. It introduces a perfluoropolyether flexible component with an ultra-low glass transition temperature to improve the low-temperature ductility of the asphalt. The ductility at 5°C is greater than 50 cm, which effectively reduces low-temperature brittleness and solves the problem of conventional high-viscosity asphalt being hard, brittle, and prone to low-temperature cracking. It also broadens the applicable temperature range of high-viscosity, high-elasticity modified asphalt and has good low-temperature crack resistance, which can effectively suppress reflective cracking.

[0030] 4) This invention provides a high-viscosity, high-elasticity modified asphalt, its preparation method, and its application. The polar groups on the surface of the polyetherimide-zinc ion coordination elastomer form hydrogen bonds and polar interactions with the asphalt gum and asphaltenes. Combined with chemical cross-linking, this strengthens the interfacial bonding between the modifier and the asphalt. The strong interfacial bonding force can inhibit the agglomeration, stratification, and phase separation of the modifier, avoiding the drawbacks of traditional high-dosage modifiers being prone to segregation and system instability.

[0031] 5) This invention provides a high-viscosity and high-elasticity modified asphalt, its preparation method and application. It uses di(tert-butylperoxyisopropyl)benzene to replace the traditional sulfur crosslinking agent. The crosslinking reaction is mild and controllable, and the rate is stable. It will not cause asphalt embrittlement and aging. At the same time, the modification efficiency is high, and it can efficiently construct a covalent crosslinking network to improve the overall structural strength. It overcomes the disadvantages of low sulfur crosslinking efficiency and uncontrollable reaction. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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).

[0035] SBS: Linear SBS produced by Sinopec Baling Petrochemical, model YH791-H, with a styrene content of 30%.

[0036] Polyetherimide-zinc ion coordination elastomer: NIMTE-PEI-Zn-T1 produced by Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences: coordination degree 65%±5%, number average molecular weight 18000, tensile strength ≥38MPa, fracture strain ≥850%, zinc ion content 9%-11%.

[0037] Polyetherimide: ULTEM 1000 manufactured by SABIC, Saudi Basic Industries Corporation, density: 1.27 g / cm³ 3 Glass transition temperature: 217 ℃, tensile strength: 105 MPa.

[0038] Perfluoropolyether: The perfluoropolyether produced by Jiangxi Zhongfu Chemical Materials Technology Co., Ltd., model ZFM-Z3, has a number average molecular weight of 10500±500, a glass transition temperature Tg of -74℃±2℃, and a kinematic viscosity of 210±20 mmHg at 20℃. 2 / s, density 1.87~1.92g / cm³ 3 .

[0039] Aromatic rubber oil: Rubber oil produced by Shandong Furunda Chemical Co., Ltd., model FRD-30, with a kinematic viscosity of 25 mm. 2 / s, flash point is 260℃.

[0040] Bis(tert-butylperoxide isopropyl)benzene: Luperox F40 manufactured by Arkema, with an active oxygen content of 9.17%, BIPB purity ≥40.0%, and density of 1.08 g / cm³. 3 .

[0041] Sulfur: Sulfur stabilizer produced by Wuxi Huasheng Rubber New Material Co., Ltd., model IS-HD-7520, with a total sulfur content of 80%.

[0042] Dicumyl peroxide (DCP): DCP-99.5 produced by Jiangsu Daoming Chemical Co., Ltd., with a purity of ≥99.5% and active oxygen content of ≥5.86%.

[0043] Nano-silicon carbide: Tosoh-nanoSiC-25 manufactured by Tosoh Corporation of Japan, with a particle size of 25±4nm, purity ≥99.95%, and density of 3.23~3.27g / cm³. 3 Specific surface area 80~100m² 2 / g.

[0044] Nano TiO2: NR-03-02 (rutile-coated aluminum silicate) produced by Shanghai Liangjiang Titanium Dioxide Co., Ltd., purity: ≥92%; particle size: 20 nm; specific surface area: ≥40 m² 2 / g.

[0045] Ordinary silicon carbide: GC F400 produced by Zhengzhou Haixu Abrasives Co., Ltd., purity ≥98.5%, particle size: D50=30±2μm (400 mesh), specific gravity: 3.20g / cm³ 3 .

[0046] Example 1 This embodiment provides a high-viscosity, high-elasticity modified asphalt, the formulation of which is shown in Table 1. The preparation method of the high-viscosity, high-elasticity modified asphalt includes the following steps: The asphalt was heated to 185℃, and SBS, polyetherimide-zinc ion coordination elastomer, and perfluoropolyether were added according to the mass ratio. The mixture was stirred at a constant speed of 300 r / min for 30 min, and then sheared at 3000 r / min for 30 min (with the shearing temperature maintained at 185℃). Then the asphalt temperature was increased to 190℃, and di(tert-butylperoxyisopropyl)benzene was added. The mixture was stirred at a constant speed of 300 r / min for 40 min. Finally, nano-silicon carbide was added, and the mixture was stirred at a constant speed of 300 r / min for 300 min to obtain high-viscosity and high-elasticity modified asphalt.

[0047] Example 2 This embodiment provides a high-viscosity, high-elasticity modified asphalt, the formulation of which is shown in Table 1. The preparation method of this embodiment is the same as that of Example 1.

[0048] Example 3 This embodiment provides a high-viscosity, high-elasticity modified asphalt, the formulation of which is shown in Table 1. The preparation method of this embodiment is the same as that of Example 1.

[0049] Example 4 This embodiment provides a high-viscosity, high-elasticity modified asphalt, the formulation of which is shown in Table 1. The preparation method of this embodiment is the same as that of Example 1.

[0050] Example 5 This embodiment provides a high-viscosity, high-elasticity modified asphalt, the formulation of which is shown in Table 1. The preparation method of this embodiment is the same as that of Example 1.

[0051] Example 6 This embodiment provides a high-viscosity, high-elasticity modified asphalt, the formulation of which is shown in Table 1. The preparation method of this embodiment is the same as that of Example 1.

[0052] Comparative Example 1 This comparative example provides a high-viscosity, high-elasticity modified 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.

[0053] Comparative Example 2 This comparative example provides a high-viscosity, high-elasticity modified 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.

[0054] Comparative Example 3 This comparative example provides a high-viscosity, high-elasticity modified 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.

[0055] Comparative Example 4 This comparative example provides a high-viscosity, high-elasticity modified 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.

[0056] Comparative Example 5 This comparative example provides a high-viscosity, high-elasticity modified 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.

[0057] Comparative Example 6 This comparative example provides a high-viscosity, high-elasticity modified 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.

[0058] Table 1 shows the formulations of Examples 1-6 and Comparative Examples 1-6.

[0059]

[0060] Comparative Example 7 This comparative example provides a high-viscosity, high-elasticity modified asphalt, which is largely the same as Example 1, except that an equal mass of polyetherimide-zinc ion coordination elastomer is replaced with polyetherimide (PEI) elastomer.

[0061] Comparative Example 8 This comparative example provides a high-viscosity, high-elasticity modified asphalt, which is largely the same as Example 1, except that an equal mass of perfluoropolyether is replaced with aromatic rubber oil.

[0062] Comparative Example 9 This comparative example provides a high-viscosity, high-elasticity modified asphalt, which is largely the same as Example 1, except that an equal mass of di(tert-butylperoxyisopropyl)benzene is replaced with sulfur powder.

[0063] Comparative Example 10 This comparative example provides a high-viscosity, high-elasticity modified asphalt, which is largely the same as Example 1, except that an equal mass of di(tert-butylperoxyisopropyl)benzene is replaced with dicumyl peroxide (DCP).

[0064] Comparative Example 11 This comparative example provides a high-viscosity, high-elasticity modified asphalt, which is largely the same as Example 1, except that an equal mass of nano-silicon carbide is replaced with nano-TiO2.

[0065] Comparative Example 12 This comparative example provides a high-viscosity, high-elasticity modified asphalt, which is largely the same as Example 1, except that an equal mass of nano-silicon carbide is replaced with 400-mesh silicon carbide particles (ordinary silicon carbide).

[0066] The high-viscosity, high-elasticity modified asphalts 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; Asphalt softening point: T 0606-2011; Ductility at 5℃: T 0605-2011; Dynamic viscosity at 60℃: T 0620-2025; Viscosity and toughness at 25℃: T 0624-2025; Elastic recovery at 25℃: T 0662-2000; Segregation test at 180℃: T 0661-2025; Ductility at 5℃ after PAV aging: T 0630-2025; High-temperature PG grading: T 0628-2011; The test results are shown in Table 2 below.

[0067] Table 2 shows the test results of Examples 1-6 and Comparative Examples 1-12.

[0068]

[0069] As shown in Table 2, it can be seen from Examples 1 to 6 that the high-viscosity and high-elasticity modified asphalt prepared using the technical solution of the present invention has a softening point >100℃, a ductility >50cm at 5℃, an elastic recovery >99%, a viscosity-toughness >40N·m, a high-temperature PG grade of 100 or above, stable asphalt storage, and excellent aging resistance. Its performance is comprehensively improved compared with ordinary high-viscosity and high-elasticity modified asphalt.

[0070] The comparison between Comparative Example 2 and Example 1 demonstrates that SBS, as the base elastomer, is crucial to the strength and elasticity of the system in this formulation.

[0071] By comparing Comparative Example 1 with Example 1, and Comparative Example 7 with Example 1, it is shown that the high-temperature stability, viscosity, elastic recovery and storage stability of asphalt will decrease when the polyetherimide-zinc ion coordination elastomer in the formulation is missing or replaced.

[0072] By comparing Comparative Example 3 with Example 1, and Comparative Example 8 with Example 1, it is shown that the absence or replacement of perfluoropolyether in this formulation significantly reduces the low-temperature crack resistance of asphalt, and also reduces the storage stability of asphalt. The comparison between Comparative Example 4 and Example 1, Comparative Example 9 and Example 1, and Comparative Example 10 and Example 1 demonstrate that the crosslinking effect of di(tert-butylperoxyisopropyl)benzene in this formulation is optimal. The absence of or replacement with ordinary crosslinking agents will significantly affect the high-temperature performance and storage stability of the modified asphalt.

[0073] By comparing Comparative Example 5 with Example 1, Comparative Example 11 with Example 1, and Comparative Example 12 with Example 1, it is shown that the nano-silicon carbide in this formulation has a significant impact on the viscosity, toughness, high-temperature PG grading, and dynamic viscosity of high-viscosity and high-elasticity asphalt. The absence of or replacement with other nanomaterials or other types of silicon carbide cannot achieve the effect of comprehensively improving the asphalt indicators.

[0074] 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-viscosity, high-elasticity modified asphalt, characterized in that, By weight, the high-viscosity, high-elasticity modified asphalt described above Includes the following substances: 100 parts of base bitumen, 6-10 parts of SBS, 2-4 parts of polyetherimide-zinc ion-coordinated elastomer, 4-8 parts of perfluoropolyether, 1-2 parts of di(tert-butylperoxyisopropyl)benzene, and 0.8-1.5 parts of nano-silicon carbide.

2. The high-viscosity, high-elasticity modified asphalt according to claim 1, characterized in that, The base asphalt is petroleum asphalt with a penetration of 30-100, in units of 0.1 mm.

3. The high-viscosity, high-elasticity modified asphalt according to claim 1, characterized in that, The SBS is linear SBS, with a styrene content of 28-32 wt%.

4. The high-viscosity, high-elasticity modified asphalt according to claim 1, characterized in that, The polyetherimide-zinc ion-coordinated elastomer is an ion-crosslinked elastomer obtained by introducing sulfonic acid groups and carboxyl groups as coordination sites on the polyetherimide chain to form a reversible ionic crosslinking network with zinc ions.

5. The high-viscosity, high-elasticity modified asphalt according to claim 1, characterized in that, The polyetherimide-zinc ion coordination elastomer appears as pale yellow transparent elastic particles. The polyetherimide-zinc ion coordination elastomer has a coordination degree of 50%-70%, a number-average molecular weight of 10,000-20,000, a zinc ion content of 7%-11%, a glass transition temperature (Tg) ≥ 210℃, a thermal decomposition temperature ≥ 370℃, a tensile strength ≥ 32 MPa, a fracture strain ≥ 750%, and a density of 1.28~1.42 g / cm³. 3 .

6. The high-viscosity, high-elasticity modified asphalt according to claim 1, characterized in that, The perfluoropolyether is a special elastomer containing only three elements, C, F, and O, and appears as a colorless and transparent liquid at room temperature. The perfluoropolyether has a number-average molecular weight of 8000-12000, a glass transition temperature (Tg) ≤ -70℃, a long-term service temperature of -80~280℃, and a density of 1.84~1.92 g / cm³. 3 The kinematic viscosity at 20℃ is 160~220 mmHg. 2 / s, volatility at 150℃ for 24 hours ≤0.04%.

7. The high-viscosity, high-elasticity modified asphalt according to claim 1, characterized in that, The di(tert-butylperoxyisopropyl)benzene appears as pale yellow granules. The di(tert-butylperoxyisopropyl)benzene has an active oxygen content of ≥9%, a molecular weight of 338.5, and a density of 1.07~1.09 g / cm³. 3 Its thermal decomposition temperature is ≥180℃, and its melting point is 108~115℃.

8. The high-viscosity, high-elasticity modified asphalt according to claim 1, characterized in that, The nano-silicon carbide appears as a gray-black powder. The nano-silicon carbide has a particle size of 20-50 nm, a purity of ≥99.9%, a molecular weight of 40.10, and a density of 3.20~3.28 g / cm³. 3 Specific surface area is 50~100m² 2 / g.

9. A method for preparing high-viscosity, high-elasticity modified asphalt as described in any one of claims 1 to 8, characterized in that, Includes the following steps: The asphalt is heated to 185-190℃, and SBS, polyetherimide-zinc ion coordination elastomer, and perfluoropolyether are added according to the mass ratio. The mixture is stirred at a constant speed of 300-500 r / min for 30-40 min, and then sheared at a constant speed of 2000-3000 r / min for 30-40 min, with the shearing temperature maintained at 185-190℃. Then, the asphalt temperature is increased to 190-200℃, and di(tert-butylperoxyisopropyl)benzene is added. The mixture is stirred at a constant speed of 300-500 r / min for 40-60 min. Finally, nano-silicon carbide is added, and the mixture is stirred at a constant speed of 300-500 r / min for 30-40 min to obtain the high-viscosity and high-elasticity modified asphalt.

10. The application of a high-viscosity, high-elasticity modified asphalt as described in any one of claims 1 to 8 in the preparation of an ultrathin wear layer.

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