Long-acting anti-aging modified asphalt based on bionic inspiration and preparation and application thereof

Abstract

The application discloses a long-acting anti-aging modified asphalt based on bionic inspiration and a preparation and application thereof. The long-acting anti-aging modified asphalt based on bionic inspiration comprises the following components in mass fractions: 2-4 parts of zinc diethyl dithiocarbamate, 0.5-1.5 parts of a bionic polymer-benzene and propylene copolymer grafted dopamine, 4 parts of a thermoplastic elastomer SBS and 400 parts of a base asphalt. Through the synergistic effect of the bionic polymer and the sulfur anti-aging agent, a double anti-aging protection system is constructed. After short-term thermal oxygen aging, the modified asphalt can still maintain excellent high-temperature stability and low-temperature crack resistance. After long-term pressure aging, the performance attenuation amplitude of the modified asphalt is significantly reduced compared with that of a traditional SBS modified asphalt, and the long-acting anti-aging characteristics are exhibited.

Description

Technical Field

[0001] This invention relates to the field of road engineering technology, and in particular to a biomimetic-inspired long-lasting anti-aging modified asphalt and its preparation and application. Background Technology

[0002] To improve the overall performance of asphalt and extend the service life of highways, polymer-modified asphalt is widely used in the field of road engineering. Polymer-modified asphalt often has excellent high and low temperature performance, which makes the asphalt pavement have good road performance. Among them, styrene-butadiene-styrene triblock copolymer (SBS) is currently the most widely used asphalt modifier.

[0003] However, as an organic polymer material, asphalt binder is prone to aging and cracking to varying degrees under prolonged heating or high-temperature heavy loads, leading to common defects such as cracks and rutting in asphalt pavements. Furthermore, SBS polymers are composed of polystyrene (PS) and polybutadiene (PB) segments. The PB segments, due to their carbon-carbon double bond structure, are easily broken under heat and oxygen, disrupting the cross-linked network structure formed by the polymer. This indicates that the aging process of common SBS polymer-modified asphalt involves both the aging of the asphalt matrix and the breakage of polymer molecular chains. Therefore, it is necessary to specifically research long-term anti-aging technologies to improve the long-term aging resistance of polymer-modified asphalt, given its susceptibility to aging. Existing anti-aging technologies for asphalt binders are mostly limited to using small-molecule antioxidants or shielding agents, which suffer from rapid performance degradation and high maintenance costs in practical applications, further limiting the use and development of high-performance asphalt materials.

[0004] Therefore, there is a need to provide a modified asphalt to improve its anti-aging properties. Summary of the Invention

[0005] In view of this, this application provides a biomimetic-inspired long-lasting anti-aging modified asphalt and its preparation and application, in order to solve the problem of how to improve the anti-aging performance of road petroleum asphalt.

[0006] To achieve the above technical objectives, this application adopts the following technical solution: In one aspect, this application provides a biomimetic-inspired long-lasting anti-aging modified asphalt, comprising the following components in parts by weight: 2-4 parts zinc diethyldithiocarbamate, 0.5-1.5 parts biomimetic polymer-styrene-propylene copolymer grafted dopamine, 4 parts thermoplastic elastomer SBS, and 400 parts base asphalt.

[0007] Preferably, the base asphalt is No. 70 base asphalt.

[0008] Preferably, the biomimetic polymer-styrene copolymer grafted with dopamine has a rigid copolymer unit of styrene-acrylic acid as its main chain and dopamine functional groups as its side chains.

[0009] Preferably, the thermoplastic elastomer SBS is YH-791H linear SBS.

[0010] Secondly, this application provides a method for preparing long-lasting anti-aging modified asphalt based on biomimetic inspiration, comprising the following steps: The base asphalt is heated once, then thermoplastic elastomer SBS is added, and after one stirring, it is heated a second time. Then, biomimetic polymer-styrene copolymer grafted with dopamine and zinc diethyldithiocarbamate is added, and after a second stirring, it is kept at a constant temperature to obtain the biomimetic-inspired long-lasting anti-aging modified asphalt.

[0011] Preferably, the temperature of the first heating is 140-150℃; the temperature of the second heating is 170-180℃; and the temperature of the constant temperature development is 100-120℃.

[0012] Preferably, the stirring speed is 400-600 r / min and the stirring time is 20-30 min.

[0013] Preferably, the secondary stirring process is to stir at 4000-5000 r / min for 40-60 min, and then stir at 1500-2000 r / min for 90-120 min.

[0014] Preferably, the preparation method of the biomimetic polymer-styrene-acrylic copolymer grafted dopamine is as follows: using styrene, acrylic acid and dopamine hydrochloride as raw materials, a copolymerization-condensation reaction is carried out to obtain the biomimetic polymer-styrene-acrylic copolymer grafted dopamine.

[0015] Thirdly, this application provides an application of biomimetic-inspired long-lasting anti-aging modified asphalt in the field of highways. The beneficial effects of this application are as follows: This application constructs a dual anti-aging protection system through the synergistic effect of biomimetic polymers and sulfur-based anti-aging agents. The catechol groups in the biomimetic polymer effectively inhibit the oxidative degradation of the asphalt matrix through a free radical capture mechanism, and their coordination effect can also passivate the catalytic effect of metal ions. The ZDC sulfur-based anti-aging agent blocks the polymer chain reaction by decomposing peroxides. Under the synergistic effect of these two mechanisms, the thermo-oxidative aging rate of the asphalt binder is significantly reduced. Experiments show that after short-term thermo-oxidative aging, this modified asphalt still maintains excellent high-temperature stability and low-temperature crack resistance. After long-term pressure aging, the degradation of various properties is significantly lower than that of traditional SBS modified asphalt, exhibiting long-term anti-aging characteristics. Detailed Implementation

[0016] The embodiments of the technical solution of this application will be described in detail below. The following embodiments are only used to illustrate the technical solution of this application more clearly, and are therefore only examples, and should not be used to limit the scope of protection of this application.

[0017] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0018] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0019] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0020] Unless otherwise explicitly defined and specified herein, all technical and scientific terms used in this application shall have the generally accepted meanings understood by one of ordinary skill in the field of chemical and chemical materials technology (including but not limited to polymer chemistry, inorganic chemistry, organic synthesis, catalysis chemistry, materials processing, and chemical unit operations) based on their professional knowledge and conventional practice. The use of any terminology herein is intended to describe the specific embodiments of this application in the clearest and most accurate manner, so as to fully disclose the technical solution. Such use shall not in any way be construed as a limitation on the scope of the claims, nor does it imply the exclusion of equivalent technical solutions that could be reasonably known by one of skill in the art based on the concept of this application.

[0021] The terms "comprising," "including," "having," "containing," and any grammatical variations or similar expressions used in the specification and claims of this application are all open-ended and non-exhaustive descriptive terms. Their purpose is to explicitly describe the existence of the stated technical features, components, steps, or parts, while explicitly allowing and covering the possibility that other features, components, steps, parts, or any combinations thereof not explicitly listed may exist or be added to the technical solution, as long as such additions do not destroy the integrity and inventiveness of the original technical solution.

[0022] When the terms "embodiments," "some embodiments," or "specific embodiments" are mentioned in the specification, they refer to examples that, in conjunction with the specific parameters, materials, steps, and results described in that section, constitute one or a group of examples for implementing the technical solutions of this application. These embodiments are used for full disclosure and illustrative purposes, not for exhaustive enumeration. Those skilled in the art should understand that, without departing from the overall inventive concept of this application, the various technical features disclosed in different embodiments can be combined, substituted, modified, or deleted to form other implementation methods that are not listed one by one in the specification but also fall within the protection scope of this application.

[0023] Unless otherwise expressly specified and limited, all terms related to chemical process operations, material preparation, processing and analytical testing involved in this application shall be interpreted in the broadest sense based on the conventional understanding of those skilled in the art.

[0024] Regarding performance testing and structural characterization, all testing and characterization methods involved in this application, unless otherwise specified, refer to conventional methods known in the art. Specific testing conditions may be selected and adjusted according to the sample properties and relevant national standards, international standards, or industry-standard methods. Test items may include mechanical properties (such as tensile, bending, and impact strength), thermal properties (such as DSC and TGA analysis), and chemical stability (such as solvent resistance and acid / alkali corrosion resistance). Structural characterization methods may include FT-IR, NMR, XRD, SEM, TEM, and BET. All test results should be understood to be within the allowable range of conventional experimental errors.

[0025] Regarding numerical values ​​and ranges, all parameter ranges expressed in this application in the form of "from a certain value to a certain value" should be understood as explicitly disclosing the endpoints of the range, each specific numerical point between the endpoints, and all sub-ranges formed by any two numerical points within the range. For example, "30℃ to 80℃" discloses 30, 31, ..., 80℃, as well as sub-ranges such as 30-50℃, 45-70℃, etc. When a numerical value is preceded by "about," "approximately," or similar words, it indicates that the numerical value is allowed to have reasonable errors recognized in the art under the measurement or control conditions, which can generally be understood as the deviation allowed by relevant standards or a normal fluctuation range of ±5% or ±10%.

[0026] This application provides a biomimetic-inspired long-lasting anti-aging modified asphalt, comprising the following components in parts by weight: 2-4 parts, 0.5-1.5 parts of biomimetic polymer-styrene-propylene copolymer grafted dopamine, 4 parts of thermoplastic elastomer SBS, and 400 parts of base asphalt.

[0027] In this application, a dual anti-aging protection system is constructed through the synergistic effect of biomimetic polymers and sulfur-based anti-aging agents. The catechol groups in the biomimetic polymers effectively inhibit the oxidative degradation of the asphalt matrix through a free radical capture mechanism, and their coordination effect can also passivate the catalytic effect of metal ions. The ZDC sulfur-based anti-aging agent blocks the polymer chain reaction by decomposing peroxides. Under the synergistic effect of these two mechanisms, the thermo-oxidative aging rate of the asphalt binder is significantly reduced. Experiments show that this modified asphalt maintains excellent high-temperature stability and low-temperature crack resistance even after short-term thermo-oxidative aging. The degradation of various properties after long-term pressure aging is significantly lower than that of traditional SBS modified asphalt, demonstrating long-lasting anti-aging characteristics.

[0028] In some embodiments, the base asphalt is No. 70 base asphalt.

[0029] In this embodiment, the softening point of the No. 70 base bitumen is 48°C, the penetration at 25°C is 68 dmm, and the ductility at 10°C is 42 cm.

[0030] In some embodiments, the biomimetic polymer-styrene copolymer grafted with dopamine has a rigid copolymer unit of styrene-acrylic acid as its main chain and dopamine functional groups as its side chains.

[0031] In this embodiment, the functional group of the biomimetic polymer-styrene copolymer grafted with dopamine is the catechol group on the side chain. The two adjacent phenolic hydroxyl groups endow it with unique redox activity and coordination ability, which can inhibit the oxidative aging of the asphalt matrix. At the same time, the material has a polymer structure, which is relatively stable and not easy to fail or decompose, and can play a long-term anti-aging role in the asphalt matrix. Zinc diethyldithiocarbamate is a sulfur-based anti-aging agent with peroxide scavenging effect. It is often used as an accelerator for natural rubber, synthetic rubber and latex. Therefore, this material can remove the peroxides generated during the degradation of thermoplastic elastomer SBS polymer and hinder its chain reaction, thereby achieving the purpose of inhibiting polymer degradation.

[0032] In some embodiments, the thermoplastic elastomer SBS is YH-791H linear SBS.

[0033] In this embodiment, the YH-791H linear SBS has a block ratio of 30 / 70 and a tensile strength of 20 MPa.

[0034] This application provides a method for preparing long-lasting anti-aging modified asphalt based on biomimetic inspiration, comprising the following steps: The base asphalt is heated once, then thermoplastic elastomer SBS is added, and after one stirring, it is heated a second time. Then, biomimetic polymer-styrene copolymer grafted with dopamine and zinc diethyldithiocarbamate is added, and after a second stirring, it is kept at a constant temperature to obtain the biomimetic-inspired long-lasting anti-aging modified asphalt.

[0035] In some embodiments, the temperature of the first heating is 140-150°C; the temperature of the second heating is 170-180°C; and the temperature of the isothermal development is 100-120°C.

[0036] In some embodiments, the stirring speed is 400-600 r / min and the stirring time is 20-30 min.

[0037] In some embodiments, the secondary stirring process involves stirring at 4000-5000 r / min for 40-60 min, and then stirring at 1500-2000 r / min for 90-120 min.

[0038] Specifically, the preparation method of biomimetic-inspired long-lasting anti-aging modified asphalt includes the following steps: Weigh 400g of No. 70 base asphalt and heat it to 140-150℃ until it reaches a fluid state. Add 4% by weight of thermoplastic elastomer SBS and stir at a low speed of 400-600 r / min for 20-30 min to allow it to slowly swell in the asphalt matrix. Then raise the temperature to 170-180℃ and add 0.5%-1.5% of biomimetic polymer-styrene copolymer grafted with dopamine, along with 2%-4% of zinc diethyldithiocarbamate (ZDC). Shear at a high speed of 4000-5000 r / min for 40-60 min. After shearing, transfer the sample to a mixer and stir thoroughly at 1500-2000 r / min for 90-120 min. After stirring, place the sample in a constant temperature oven at 100-120℃ for 30-40 min to fully develop, thus obtaining anti-aging modified asphalt. After preparation, the anti-aging modified asphalt was tested for softening point, penetration at 25℃ and ductility at 5℃ according to the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG 3410-2025), and the test results were recorded.

[0039] In some embodiments, the preparation method of the biomimetic polymer-styrene-acrylic copolymer grafted dopamine is as follows: using styrene, acrylic acid and dopamine hydrochloride as raw materials, a copolymerization-condensation reaction is carried out to obtain the biomimetic polymer-styrene-acrylic copolymer grafted dopamine.

[0040] This application provides a biomimetic-inspired long-lasting anti-aging modified asphalt for use in the highway sector. Raw material preparation: The preparation method of dopamine grafted onto the biomimetic polymer-styrene-acrylic copolymer is as follows: Under N2 protection, 20g of styrene, 1g of acrylic acid, 0.2g of azobisisobutyronitrile (AIBN), and 40ml of anhydrous DMF were sequentially added to a single-necked round-bottom flask at room temperature, stirred evenly, and reacted in a 60℃ water bath for 10h. After the reaction, the mixture was repeatedly washed with n-hexane until the upper layer was colorless, and the lower layer was dried in a 60℃ vacuum oven for 5h to obtain the reaction product, styrene-acrylic copolymer (St-A). The condensation of the styrene-acrylic copolymer with dopamine: First, 6g of crushed St-A was added to a single-necked flask at room temperature, dissolved completely in 20ml of anhydrous DMF, and then 0.643g of 1-hydroxybenzotriazole (HOBt) was added. Next, the system was cooled to zero degrees Celsius, and 0.912g of carbodiimide salt (EDC) was added, and the mixture was stirred and dissolved while being bubbled with N2 for 30min. Subsequently, in another single-necked flask, 0.902 g of dopamine hydrochloride (DA) was added, dissolved in 15 ml of anhydrous DMF, and 0.481 g of anhydrous triethylamine (TEA) was added for activation. After 10 min, the solution was added to the aforementioned flask. Finally, the pH of the reaction system was adjusted to approximately 8 with anhydrous triethylamine, and the reaction was carried out at 25 °C under N2 protection for 12 h. After the reaction was completed, the resulting solution was precipitated three times with dilute hydrochloric acid solution, washed several times, and dried under vacuum at 50 °C to obtain biomimetic polymer-styrene-propylene copolymer grafted dopamine.

[0041] The following specific embodiments further illustrate this solution.

[0042] Example 1 A biomimetic-inspired long-lasting anti-aging modified asphalt comprises the following components in parts by weight: 3 parts zinc diethyldithiocarbamate (ZDC), 1 part biomimetic polymer-styrene-propylene copolymer grafted dopamine, 4 parts thermoplastic elastomer SBS, and 400 parts base asphalt.

[0043] The preparation method of biomimetic-inspired long-lasting anti-aging modified asphalt is as follows: The No. 70 base asphalt was heated to 150℃ and fully heated to a fluid state. An appropriate mass of thermoplastic elastomer SBS was added, and the mixture was stirred at a low speed of 500 r / min for 20 min to allow it to slowly swell in the asphalt matrix. Then, the temperature was raised to 175℃, and an appropriate mass of biomimetic polymer-styrene-propylene copolymer grafted dopamine was added, along with an appropriate mass of ZDC. The mixture was then sheared at a high speed of 4000 r / min for 50 min. After shearing, the sample was transferred to a mixer and stirred thoroughly at a speed of 2000 r / min for 100 min. After stirring, the sample was placed in a constant temperature oven at 110℃ for 30 min to fully develop, thus obtaining the anti-aging modified asphalt.

[0044] Example 2 A biomimetic-inspired long-lasting anti-aging modified asphalt is described, which is otherwise identical to Example 1, except that the biomimetic polymer-styrene copolymer grafted with dopamine is 0.5 parts by mass.

[0045] Example 3 A biomimetic-inspired long-lasting anti-aging modified asphalt is described, which is otherwise identical to Example 1, except that the biomimetic polymer-styrene copolymer grafted with dopamine is 1.5 parts by mass.

[0046] Example 4 A biomimetic-inspired long-lasting anti-aging modified asphalt is described, which is otherwise identical to Example 1, except that the amount of zinc diethyldithiocarbamate (ZDC) is 2 parts by mass.

[0047] Example 5 A biomimetic-inspired long-lasting anti-aging modified asphalt is described, which is otherwise identical to Example 1, except that the amount of zinc diethyldithiocarbamate (ZDC) is 4 parts by mass.

[0048] Comparative Example 1 An anti-aging modified asphalt comprises 400g of No. 70 base asphalt, 4% of thermoplastic elastomer SBS relative to the asphalt mass, and 1% of biomimetic polymer-styrene-propylene copolymer grafted dopamine relative to the asphalt mass.

[0049] The preparation method of anti-aging modified asphalt is as follows: The No. 70 base asphalt was heated to 150℃ and fully heated to a fluid state. An appropriate mass of thermoplastic elastomer SBS was added, and the mixture was stirred at a low speed of 500 r / min for 20 min to allow it to slowly swell in the asphalt matrix. Then, the temperature was raised to 175℃, and an appropriate mass of biomimetic polymer-styrene-propylene copolymer grafted dopamine was added. The mixture was then sheared at a high speed of 4000 r / min for 50 min. After shearing, the sample was transferred to a mixer and stirred thoroughly at a speed of 2000 r / min for 100 min. After stirring, the sample was placed in a constant temperature oven at 110℃ for 30 min to fully develop.

[0050] Comparative Example 2 An anti-aging modified asphalt comprises 400g of No. 70 base asphalt, 4% of thermoplastic elastomer SBS relative to the asphalt mass, and 3% of ZDC relative to the asphalt mass.

[0051] The preparation method of anti-aging modified asphalt is as follows: Heat the No. 70 base asphalt to 150℃ until it reaches a fluid state. Add the appropriate mass of thermoplastic elastomer SBS and stir at a low speed of 500 r / min for 20 min to allow it to slowly swell in the asphalt matrix. Then raise the temperature to 175℃, add the appropriate mass of ZDC, and shear at a high speed of 4000 r / min for 50 min. After shearing, transfer the sample to a mixer and stir thoroughly at a speed of 2000 r / min for 100 min. After stirring, transfer the sample to a constant temperature oven at 110℃ for 30 min to fully develop.

[0052] Comparative Example 3 A conventional modified asphalt is prepared as follows: Weigh 400g of No. 70 base asphalt and heat it to 150℃ until it reaches a fluid state. Add 4% by weight of thermoplastic elastomer SBS and stir at a low speed of 500 r / min for 20 min to allow it to slowly swell in the asphalt matrix. Then raise the temperature to 175℃ and shear at a high speed of 4000 r / min for 50 min. After shearing, transfer the sample to a mixer and stir thoroughly at a speed of 2000 r / min for 100 min. After stirring, transfer the sample to a constant temperature oven at 110℃ for 30 min to fully develop, thus obtaining conventional modified asphalt.

[0053] Testing and Evaluation Laboratory simulations of thermo-oxidative aging were conducted on the prepared conventional modified asphalt and anti-aging modified asphalt. First, the prepared modified asphalt was evenly poured into each aging pan, with the mass of asphalt in each pan controlled at 50 ± 0.5 g. Then, the aging pans containing the modified asphalt were placed in a thin-film oven (TFOT) and subjected to short-term aging at 163℃ for 5 hours to simulate thermo-oxidative aging caused by heat during storage, transportation, mixing, and paving, thus preparing the short-term aged anti-aging modified asphalt. Simultaneously, based on the short-term aging, the samples were transferred to an asphalt pressure aging tester (PAV) and aged for 20 hours at a test temperature of 100℃ and an air pressure of 2.1 MPa to obtain the long-term aged modified asphalt.

[0054] The following performance tests were conducted on conventional modified asphalt and anti-aging modified asphalt before aging tests and after long-term aging: Softening point (°C) test: The test is conducted according to GB / T 4507. The 2014 standard tests the softening temperature of asphalt under heating conditions using the ring and sphere methods, reflecting the thermal stability of asphalt materials in high-temperature environments.

[0055] 5℃ ductility (cm) test: The test is based on GB / T 4508. 2010 Standard; The test content is to measure the length of asphalt specimens stretched to fracture under low temperature conditions to evaluate the low-temperature flexibility and crack resistance of the material.

[0056] 25℃ Penetration (0.1mm) Test: Test standard is GB / T 4509 The 2010 standard tests the depth to which a standard needle penetrates an asphalt sample under its own weight at a standard temperature, reflecting the hardness and consistency of the asphalt.

[0057] TFOT mass loss (%): Tested according to GB / T 5304 The 2001 standard tested asphalt by using the Thin Film Oven Test (TFOT) to evaluate its volatilization loss and thermal aging characteristics at high temperatures.

[0058] Rheological property test: The test is based on ASTM D7175 standard; the test content is to obtain the complex modulus (Pa) and phase angle (°) of the asphalt sample by temperature scanning test using a dynamic shear rheometer (DSR), which reflects the asphalt's resistance to deformation.

[0059] The performance test results are summarized in Tables 1 and 2.

[0060] Table 1. Performance test results of modified asphalt before aging

[0061] Table 2. Performance test results of modified asphalt after aging

[0062] In summary, comparing the performance test results of unaged and aged modified asphalt, the changes in their thermal stability, physical properties, and rheological properties directly reflect the significant improvement effect of the anti-aging modified asphalt of this invention. The specific summary is as follows: The anti-aging modified asphalt prepared in Example 1 exhibits significantly improved low-temperature flexibility compared to conventional modified asphalt. The anti-aging modified asphalt achieves a ductility of 50.5 cm at 5°C, an increase of approximately 40%. Even under long-term aging, the ductility at 5°C still reaches 16.7 cm, with a ductility retention rate of 33.1%, compared to only 3.9% for conventional modified asphalt, representing an improvement of approximately 29.2%. This significantly reduces the risk of insufficient flexibility and cracking of asphalt materials at low temperatures. While high-temperature performance decreases slightly, its high-temperature aging resistance is significantly improved. The softening point of the anti-aging modified asphalt decreases by only 4.7°C compared to conventional modified asphalt. The high-temperature mass loss of conventional modified asphalt is 0.75%, while that of the anti-aging modified asphalt is only 0.36%, indicating excellent thermal stability. Rheological performance tests showed a significant improvement in its anti-aging properties. Based on the results of the complex modulus and phase angle obtained from the tests, the rutting factor was calculated. Under long-term aging, compared with conventional modified asphalt, the rutting factor of anti-aging modified asphalt increased slowly, with an increase rate of only 54% of that of conventional modified asphalt. The calculated aging index was 7.59 for conventional modified asphalt and 4.55 for anti-aging modified asphalt, a decrease of 40%. This indicates that the high-temperature fluidity and deformation resistance of anti-aging modified asphalt are well preserved, and it has considerable durability.

[0063] The test results of Examples 1-3 show that by adjusting the amount of biomimetic polymer, the softening point and rutting factor decrease slightly with the increase of the amount of biomimetic polymer, while the ductility and penetration increase significantly. The changes in physical properties after aging are inconsistent. Example 1 has the lowest softening point, the highest ductility and penetration, and the lowest aging index, indicating that Example 1 has the best anti-aging effect.

[0064] The test results of Examples 1, 4 and 5 show that by adjusting the amount of ZDC, the softening point and rutting factor gradually increase with the increase of ZDC content, while the ductility and penetration decrease slightly. After aging, the softening point increases and the ductility and penetration decrease significantly. Compared with Example 1, the aging index of Examples 4 and 5 is significantly larger, indicating that Example 1 has the best anti-aging effect.

[0065] Example 1, and the test results of Comparative Examples 1 and 2 show that by adding biomimetic polymer and ZDC alone to determine whether they have a synergistic anti-aging effect, adding biomimetic polymer alone significantly improved the low-temperature ductility and penetration of conventional modified asphalt, while the softening point and rutting factor decreased slightly. The ductility after aging was 10.6 cm, a significant decrease, and the aging index was 5.98, a significant increase. Adding ZDC alone increased the softening point and rutting factor, while decreasing the ductility and penetration. The ductility after aging was only 4.8 cm, and the aging index was 6.36. This indicates that the anti-aging effect of adding biomimetic polymer and ZDC alone is limited, and the anti-aging effect of biomimetic polymer is superior to that of ZDC. When both are used simultaneously, Example 1 shows the best anti-aging effect.

[0066] This application achieves durable anti-aging properties through the chemical bonding of biomimetic polymers and the non-degradability of long-chain polymers. The preparation process employs a melt blending method to ensure uniform dispersion of the modifier in the asphalt matrix, giving the modified asphalt excellent high and low temperature performance and durability. In engineering applications, this anti-aging modified asphalt can extend pavement service life, reduce maintenance frequency, and exhibits significantly better resistance to thermo-oxidative aging than currently used modified asphalt systems. It is particularly suitable for road construction in low-temperature environments and areas with heavy traffic loads, and has broad engineering application prospects.

[0067] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A biomimetic-inspired long-lasting anti-aging modified asphalt, characterized in that, The product contains the following components in parts by weight: 2-4 parts zinc diethyldithiocarbamate, 0.5-1.5 parts biomimetic polymer-styrene-propylene copolymer grafted dopamine, 4 parts thermoplastic elastomer SBS, and 400 parts base bitumen.

2. The biomimetic-inspired long-lasting anti-aging modified asphalt according to claim 1, characterized in that, The base asphalt is No. 70 base asphalt.

3. The biomimetic-inspired long-lasting anti-aging modified asphalt according to claim 1, characterized in that, The biomimetic polymer-styrene copolymer grafted with dopamine has a rigid copolymer unit of styrene-acrylic acid as its main chain and dopamine functional groups as its side chains.

4. The biomimetic-inspired long-lasting anti-aging modified asphalt according to claim 1, characterized in that, The thermoplastic elastomer SBS is YH-791H linear SBS.

5. A method for preparing biomimetic-inspired long-lasting anti-aging modified asphalt as described in any one of claims 1-4, characterized in that, Includes the following steps: The base asphalt is heated once, then thermoplastic elastomer SBS is added, and after one stirring, it is heated a second time. Then, biomimetic polymer-styrene copolymer grafted with dopamine and zinc diethyldithiocarbamate is added, and after a second stirring, it is kept at a constant temperature to obtain the biomimetic-inspired long-lasting anti-aging modified asphalt.

6. The preparation method according to claim 5, characterized in that, The temperature of the first heating is 140-150℃; the temperature of the second heating is 170-180℃; and the temperature of the constant temperature development is 100-120℃.

7. The preparation method according to claim 5, characterized in that, The stirring speed for one stirring cycle is 400-600 r / min, and the stirring time is 20-30 min.

8. The preparation method according to claim 5, characterized in that, The secondary stirring process involves stirring at 4000-5000 r / min for 40-60 minutes, followed by stirring at 1500-2000 r / min for 90-120 minutes.

9. The preparation method according to claim 5, characterized in that, The preparation method of the biomimetic polymer-styrene-acrylic copolymer grafted dopamine is as follows: using styrene, acrylic acid and dopamine hydrochloride as raw materials, a copolymerization-condensation reaction is carried out to obtain the biomimetic polymer-styrene-acrylic copolymer grafted dopamine.

10. The application of the biomimetic-inspired long-lasting anti-aging modified asphalt as described in any one of claims 1-4 in the field of highways.

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