High-bio-based epoxy modified hot-mix asphalt mixture and preparation method thereof

Abstract

The invention relates to the technical field of asphalt, in particular to a high-bio-based epoxy modified hot-mix asphalt mixture and a preparation method thereof.The preparation method of the high-bio-based epoxy modified hot-mix asphalt mixture comprises the steps that 1, aggregate and mineral powder are preheated for use; 2, epoxy resin and a curing agent are stirred and mixed, and a premix is obtained; 3, the premix and matrix asphalt are sheared and mixed at a high speed, and homogeneous hot-mixed epoxy modified asphalt is obtained; and Step 4, adding the aggregate into the reaction kettle, stirring and mixing, then adding the hot-mixed epoxy modified asphalt, continuously stirring, finally adding the mineral powder, and uniformly stirring to obtain the modified asphalt. The asphalt mixture prepared by the method is high in Marshall stability, good in bearing and structural stability, appropriate in flow value, easy to construct, stable in use performance, high in track dynamic stability, high in high-temperature track resistance and durability, large in low-temperature limit strain and good in low-temperature cracking resistance, adopts a high bio-based material, and is environment-friendly and sustainable.

Description

Technical Field

[0001] This application relates to the technical field of asphalt, and more specifically, it relates to a high bio-based epoxy modified hot mix asphalt mixture and its preparation method. Background Art

[0002] As one of the main materials for road construction and maintenance, asphalt mixtures are widely used in highways, urban roads, airport runways and other places. Traditional hot mix asphalt mixtures mainly use petroleum asphalt as the binder. Although they have good construction performance and certain road performance, there are also some limitations. For example, petroleum asphalt is prone to softening at high temperatures and brittle cracking at low temperatures, resulting in diseases such as rutting, cracking, and bleeding on the road surface during long-term use, affecting the service life of the road and driving safety. Traditional asphalt mixtures are difficult to meet the requirements of modern high-grade road construction. Especially in some extreme climate conditions, such as high temperature, low temperature, high cold, high altitude and other regions, the performance defects of traditional asphalt mixtures are more obvious. In recent years, with the enhancement of environmental awareness and the deepening of the concept of sustainable development, bio-based materials have been widely studied and applied in various fields. High bio-based epoxy resin, as a high-performance material prepared from renewable resources, has good environmental performance and mechanical properties similar to those of traditional epoxy resins. Applying it to asphalt mixtures can not only improve the performance of the mixtures, but also reduce the dependence on petroleum-based materials and lower carbon emissions, meeting the requirements of green road construction.

[0003] Although there are currently some studies and applications on epoxy modified asphalt mixtures, most of them focus on traditional petroleum-based epoxy resins, and there are relatively few studies on high bio-based epoxy resin modified hot mix asphalt mixtures. In addition, the existing technology lacks systematic research and optimization on the mixing ratio, mixing process of high bio-based epoxy resin, high bio-based curing agent and petroleum asphalt, and their effects on the performance of the mixtures. Therefore, it is of great practical significance to develop a high bio-based epoxy modified hot mix asphalt mixture with excellent performance, convenient construction, environmental protection and sustainability and its preparation method. To sum up, the present invention aims to provide a high bio-based epoxy modified hot mix asphalt mixture and its preparation method, giving full play to the performance advantages of high bio-based epoxy resin, solving the deficiencies of existing asphalt mixtures in terms of high temperature stability, low temperature crack resistance, durability and environmental performance, providing a new, high-performance and sustainable material solution for road construction, and having a relatively low procurement cost, meeting the trend of social development. Summary of the Invention

[0004] To solve the technical problems mentioned in the background art, this application provides a high bio-based epoxy modified hot mix asphalt mixture and its preparation method.

[0005] In the first aspect, the present application provides a high bio-based epoxy modified hot mix asphalt mixture, adopting the following technical solution: A high bio-based epoxy modified hot mix asphalt mixture, the high bio-based epoxy modified hot mix asphalt mixture comprising: 5 - 6 parts of epoxy resin, 3 - 4 parts of curing agent, 40 - 100 parts of matrix asphalt, 260 - 270 parts of aggregate, and 30 - 50 parts of mineral powder.

[0006] Preferably, the sum of the masses of the epoxy resin and the curing agent is 10 - 20% of the matrix asphalt.

[0007] Preferably, the epoxy resin is composed of 44 - 44.9 wt% of epoxidized soybean oil, 44 - 45 wt% of cardanol, 10 wt% of bisphenol A type E - 51 epoxy resin, and 0.1 - 2 wt% of crosslinking agent.

[0008] Preferably, the crosslinking agent is methyltetrahydrophthalic anhydride.

[0009] The curing agent is composed of 60 - 70 wt% of bio-based pentamethylenediamine, 29 - 39.9 wt% of methylpentamethylenediamine, and 0.1 - 1 wt% of curing accelerator.

[0010] Preferably, the curing accelerator is one or more of 4,4'-diaminodiphenyl sulfone, 4,4'-diaminodiphenyl methane, and 2,4,6-tris(dimethylaminomethyl)phenol.

[0011] Preferably, the matrix asphalt is 70# matrix petroleum asphalt.

[0012] In the second aspect, the present application further provides a preparation method of a high bio-based epoxy modified hot mix asphalt mixture, adopting the following technical solution: Step1: Preheat the aggregate and mineral powder to 160 - 170 °C for standby; Step2: Stir and mix the epoxy resin and the curing agent at room temperature to obtain a premix; Step3: High-speed shear mix the premix and the matrix asphalt at a temperature of 130 - 150 °C to obtain a homogeneous hot mix epoxy modified asphalt; Step4: Add the aggregate into the reaction kettle, stir and mix at a temperature of 170 - 180 °C, then add the hot mix epoxy modified asphalt, continue to stir, and finally add the mineral powder and stir evenly to obtain the high bio-based epoxy modified hot mix asphalt mixture.

[0013] In summary, the present application has the following beneficial effects: The high bio-based epoxy resin component of this application mainly consists of epoxidized soybean oil and cardanol, and the petroleum-based component bisphenol A type E-51 epoxy resin only accounts for 10%. Cardanol is a natural phenolic compound with a unique long-chain alkane. It has both the high-temperature resistance characteristics of aromatic compounds and the good flexibility, excellent water repellency, and low permeability of aliphatic compounds. The phenolic hydroxyl group on the benzene ring can also react with the epoxy group to open the ring. Bio-based components such as epoxidized soybean oil and cardanol provide good flexibility for the asphalt mixture, effectively improving its crack resistance. In an environment with large temperature changes, especially at low temperatures, the bio-based epoxy resin can enable the asphalt mixture to resist shrinkage stress, reduce the generation and expansion of cracks, and extend the service life of the road surface.

[0014] The high bio-based epoxy curing agent of this application is composed of bio-based pentamethylenediamine, methylpentamethylenediamine, and a small amount of curing accelerator. Taking the curing accelerator 4,4'-diaminodiphenylmethane as an example, groups such as the benzene ring in its molecular structure can improve the thermal stability of the cured product, enabling the asphalt mixture to better maintain its performance in a high-temperature environment, reducing problems such as deformation and softening caused by temperature rise, and extending the service life of the road surface in high-temperature regions or high-temperature seasons. The epoxy curing agent and the bio-based epoxy resin act synergistically to enhance the adhesion between the asphalt and the aggregate, making it difficult for the aggregate to fall off from the asphalt, maintaining the integrity of the structure, and improving the skid resistance and wear resistance of the road surface. Moreover, the bio-based pentamethylenediamine in the epoxy curing agent can prevent the embrittlement after curing of epoxidized soybean oil and cardanol. The overall bio-based content exceeds 83%. This high bio-based epoxy resin forms a stable cross-linked structure in the asphalt mixture, improving the water resistance and corrosion resistance of the mixture. Bio-based raw materials such as epoxidized soybean oil, cardanol, bio-based pentamethylenediamine, and methylpentamethylenediamine are derived from renewable plant resources and the biological fermentation process. The extensive use of these bio-based components can significantly reduce the dependence on non-renewable petroleum resources, contribute to the sustainable utilization of resources, and conform to the current concept of green development and circular economy.

[0015] The bio-based epoxy resin of this application is cured at high temperature and will not react under normal temperature conditions. It starts to cure after 140°C, which fully conforms to the process temperature of normal hot mix asphalt. It can be directly added in the asphalt tank or mixing plant without on-site addition, with simple and fast operation and strong feasibility. Detailed implementation mode

[0016] The following further elaborates on this application in combination with examples.

[0017] In the examples and comparative examples of the present invention, the epoxidized soybean oil used was purchased from Jiangsu Sanmu Chemical Co., Ltd.; the bisphenol A type E-51 epoxy resin was purchased from Changchun Chemical (Jiangsu) Co., Ltd.; the cardanol was purchased from Cardolite Corporation; the bio-based pentamethylenediamine was purchased from Shanghai Kaisai Biotechnology Co., Ltd.; and the methylpentamethylenediamine was purchased from Zibo Qixiang Tengda Chemical Co., Ltd.

[0018] Examples 1-3 provide a highly bio-based epoxy-modified hot mix asphalt mixture and a preparation method therefor.

[0019] Example 1 A highly bio-based epoxy-modified hot mix asphalt mixture, comprising: 5 parts of epoxy resin, 3 parts of curing agent, 40 parts of matrix asphalt, 260 parts of aggregate, and 30 parts of mineral powder; wherein, the matrix asphalt is 70# matrix petroleum asphalt; the sum of the masses of the epoxy resin and the curing agent is 20% of the matrix asphalt.

[0020] Among them, the epoxy resin is composed of 44 wt% of epoxidized soybean oil, 44 wt% of cardanol, 10 wt% of bisphenol A type E-51 epoxy resin, and 2 wt% of methyltetrahydrophthalic anhydride.

[0021] Among them, the curing agent is composed of 60 wt% of bio-based pentamethylenediamine, 39.9 wt% of methylpentamethylenediamine, and 0.1 wt% of 4,4'-diaminodiphenylmethane.

[0022] A preparation method for a highly bio-based epoxy-modified hot mix asphalt mixture, the specific preparation steps are as follows: Step1: Preheat the aggregate and the mineral powder to 160 °C for standby; Step2: Stir and mix the epoxy resin and the curing agent at room temperature to obtain a premix; Step3: High-speed shear and mix the premix with the matrix asphalt at a temperature of 130 °C for 30 min, and the shear speed is 3000 rpm to obtain a homogeneous hot mix epoxy-modified asphalt; Step4: Add the aggregate to the reaction kettle, under the condition of 170 °C, with a stirring speed of 4000 rpm, stir and mix for 10 min, then add the hot mix epoxy-modified asphalt, stir for 20 min, and finally add the mineral powder, and continue to stir for 30 min. After stirring evenly, a highly bio-based epoxy-modified hot mix asphalt mixture is obtained.

[0023] Example 2 A highly bio-based epoxy-modified hot mix asphalt mixture, comprising: 5.5 parts of epoxy resin, 3.5 parts of curing agent, 60 parts of matrix asphalt, 265 parts of aggregate, and 40 parts of mineral powder; wherein, the matrix asphalt is 70# matrix petroleum asphalt; the sum of the masses of the epoxy resin and the curing agent is 15% of the matrix asphalt.

[0024] Among them, the epoxy resin is composed of 44.5wt% of epoxidized soybean oil, 44.5wt% of cardanol, 10wt% of bisphenol A type E-51 epoxy resin and 1wt% of methyltetrahydrophthalic anhydride.

[0025] Among them, the curing agent is composed of 65wt% of bio-based pentamethylenediamine, 34.5wt% of methylpentamethylenediamine and 0.5wt% of 4,4'-diaminodiphenylmethane.

[0026] A preparation method of a high bio-based epoxy modified hot mix asphalt mixture, and the specific preparation steps are as follows: Step1: Preheat the aggregate and mineral powder to 165 °C for standby; Step2: Stir and mix the epoxy resin and the curing agent at room temperature to obtain a premix; Step3: High-speed shear mix the premix and the base asphalt at 140 °C for 45 min, with a shear speed of 3500 rpm, to obtain a homogeneous hot mix epoxy modified asphalt; Step4: Add the aggregate to the reaction kettle, under the condition of 175 °C, with a stirring speed of 4500 rpm, stir and mix for 12 min, then add the hot mix epoxy modified asphalt, stir for 30 min, and finally add the mineral powder, continue to stir for 40 min. After stirring evenly, the high bio-based epoxy modified hot mix asphalt mixture is obtained.

[0027] Example 3 A high bio-based epoxy modified hot mix asphalt mixture, including: 6 parts of epoxy resin, 4 parts of curing agent, 100 parts of base asphalt, 270 parts of aggregate, 50 parts of mineral powder; among them, the base asphalt is 70# base petroleum asphalt; the sum of the masses of the epoxy resin and the curing agent is 10% of the base asphalt.

[0028] Among them, the epoxy resin is composed of 44.9wt% of epoxidized soybean oil, 45wt% of cardanol, 10wt% of bisphenol A type E-51 epoxy resin and 0.1wt% of methyltetrahydrophthalic anhydride.

[0029] Among them, the curing agent is composed of 70wt% of bio-based pentamethylenediamine, 29wt% of methylpentamethylenediamine and 1wt% of 4,4'-diaminodiphenylmethane.

[0030] A preparation method of a high bio-based epoxy modified hot mix asphalt mixture, and the specific preparation steps are as follows: Step1: Preheat the aggregate and mineral powder to 170 °C for standby; Step2: Stir and mix the epoxy resin and the curing agent at room temperature to obtain a premix; Step3: High-speed shear mix the premix and the base asphalt at 150 °C for 60 min, with a shear speed of 4000 rpm, to obtain a homogeneous hot mix epoxy modified asphalt; Step 4: Add the aggregate into the reactor. Under the condition of 180 °C, with a stirring speed of 5000 rpm, stir and mix for 15 min. Then add the hot-mixed epoxy modified asphalt, stir for 40 min, and finally add the mineral powder and continue to stir for 60 min. After stirring evenly, the high bio-based epoxy modified hot-mixed asphalt mixture is obtained.

[0031] Comparative Example 1 A high bio-based epoxy modified hot-mixed asphalt mixture includes: 5 parts of epoxy resin, 3 parts of curing agent, 40 parts of matrix asphalt, 260 parts of aggregate, and 30 parts of mineral powder; wherein, the matrix asphalt is 70# matrix petroleum asphalt; the sum of the masses of the epoxy resin and the curing agent is 20% of the matrix asphalt.

[0032] Among them, the epoxy resin is composed of 88 wt% of epoxy soybean oil, 10 wt% of bisphenol A type E-51 epoxy resin, and 2 wt% of methyltetrahydrophthalic anhydride.

[0033] Among them, the curing agent is composed of 60 wt% of bio-based pentamethylenediamine, 39.9 wt% of methylpentamethylenediamine, and 0.1 wt% of 4,4'-diaminodiphenylmethane.

[0034] A preparation method of a high bio-based epoxy modified hot-mixed asphalt mixture, the specific preparation steps are as follows: Step 1: Preheat the aggregate and the mineral powder to 160 °C for standby; Step 2: Stir and mix the epoxy resin and the curing agent at room temperature to obtain a premix; Step 3: High-speed shear mix the premix and the matrix asphalt at a temperature of 130 °C for 30 min, with a shear speed of 3000 rpm, to obtain a homogeneous hot-mixed epoxy modified asphalt; Step 4: Add the aggregate into the reactor. Under the condition of 170 °C, with a stirring speed of 4000 rpm, stir and mix for 10 min. Then add the hot-mixed epoxy modified asphalt, stir for 20 min, and finally add the mineral powder and continue to stir for 30 min. After stirring evenly, the high bio-based epoxy modified hot-mixed asphalt mixture is obtained.

[0035] Comparative Example 2 A high bio-based epoxy modified hot-mixed asphalt mixture includes: 5 parts of epoxy resin, 3 parts of curing agent, 40 parts of matrix asphalt, 260 parts of aggregate, and 30 parts of mineral powder; wherein, the matrix asphalt is 70# matrix petroleum asphalt; the sum of the masses of the epoxy resin and the curing agent is 20% of the matrix asphalt.

[0036] Among them, the epoxy resin is composed of 88 wt% of cardanol, 10 wt% of bisphenol A type E-51 epoxy resin, and 2 wt% of methyltetrahydrophthalic anhydride.

[0037] Among them, the curing agent is composed of 60 wt% of bio-based pentamethylenediamine, 39.9 wt% of methylpentamethylenediamine, and 0.1 wt% of 4,4'-diaminodiphenylmethane.

[0038] A preparation method of a high bio-based epoxy modified hot mix asphalt mixture, and the specific preparation steps are as follows: Step1: Preheat the aggregate and mineral powder to 160 °C for standby; Step2: Stir and mix the epoxy resin and the curing agent at room temperature to obtain a premix; Step3: High-speed shear mix the premix and the base asphalt at a temperature of 130 °C for 30 min, and the shear speed is 3000 rpm to obtain a homogeneous hot mix epoxy modified asphalt; Step4: Add the aggregate to the reaction kettle, under the condition of 170 °C, with a stirring speed of 4000 rpm, stir and mix for 10 min, then add the hot mix epoxy modified asphalt, stir for 20 min, and finally add the mineral powder, continue to stir for 30 min. After stirring evenly, the high bio-based epoxy modified hot mix asphalt mixture is obtained.

[0039] Comparative Example 3 A high bio-based epoxy modified hot mix asphalt mixture, comprising: 5 parts of epoxy resin, 3 parts of curing agent, 40 parts of base asphalt, 260 parts of aggregate, and 30 parts of mineral powder; among them, the base asphalt is 70# base petroleum asphalt; the sum of the masses of the epoxy resin and the curing agent is 20% of the base asphalt.

[0040] Among them, the epoxy resin is composed of 44 wt% of epoxy soybean oil, 44 wt% of cardanol, 10 wt% of bisphenol A type E-51 epoxy resin, and 2 wt% of methyltetrahydrophthalic anhydride.

[0041] Among them, the curing agent is composed of 99.9 wt% of bio-based pentamethylenediamine and 0.1 wt% of 4,4'-diaminodiphenylmethane.

[0042] A preparation method of a high bio-based epoxy modified hot mix asphalt mixture, and the specific preparation steps are as follows: Step1: Preheat the aggregate and mineral powder to 160 °C for standby; Step2: Stir and mix the epoxy resin and the curing agent at room temperature to obtain a premix; Step3: High-speed shear mix the premix and the base asphalt at a temperature of 130 °C for 30 min, and the shear speed is 3000 rpm to obtain a homogeneous hot mix epoxy modified asphalt; Step 4: Add aggregate into the reaction kettle. Under the condition of 170 °C, stir at 4000 rpm for 10 min, then add hot-mixed epoxy modified asphalt and stir for 20 min. Finally, add mineral powder and continue to stir for 30 min. After stirring evenly, the high bio-based epoxy modified hot-mix asphalt mixture is obtained.

[0043] Comparative Example 4 A high bio-based epoxy modified hot-mix asphalt mixture, comprising: 5 parts of epoxy resin, 3 parts of curing agent, 40 parts of base asphalt, 260 parts of aggregate, and 30 parts of mineral powder; wherein, the base asphalt is 70# base petroleum asphalt; the sum of the masses of the epoxy resin and the curing agent is 20% of the base asphalt.

[0044] Among them, the epoxy resin is composed of 44 wt% of epoxidized soybean oil, 44 wt% of cardanol, 10 wt% of bisphenol A type E-51 epoxy resin, and 2 wt% of methyltetrahydrophthalic anhydride.

[0045] Among them, the curing agent is composed of 99.9 wt% of methylpentanediamine and 0.1 wt% of 4,4'-diaminodiphenylmethane.

[0046] A preparation method of a high bio-based epoxy modified hot-mix asphalt mixture, and the specific preparation steps are as follows: Step 1: Preheat the aggregate and mineral powder to 160 °C for standby; Step 2: Stir and mix the epoxy resin and the curing agent at normal temperature to obtain a premix; Step 3: High-speed shear and mix the premix and the base asphalt at 130 °C for 30 min, and the shear speed is 3000 rpm to obtain a homogeneous hot-mixed epoxy modified asphalt; Step 4: Add aggregate into the reaction kettle. Under the condition of 170 °C, stir at 4000 rpm for 10 min, then add hot-mixed epoxy modified asphalt and stir for 20 min. Finally, add mineral powder and continue to stir for 30 min. After stirring evenly, the high bio-based epoxy modified hot-mix asphalt mixture is obtained.

[0047] Comparative Example 5 A high bio-based epoxy modified hot-mix asphalt mixture, comprising: 5 parts of epoxy resin, 3 parts of curing agent, 40 parts of base asphalt, 260 parts of aggregate, and 30 parts of mineral powder; wherein, the base asphalt is 70# base petroleum asphalt; the sum of the masses of the epoxy resin and the curing agent is 20% of the base asphalt.

[0048] Among them, the epoxy resin is composed of 44 wt% of epoxidized soybean oil, 44 wt% of cardanol, 10 wt% of bisphenol A type E-51 epoxy resin, and 2 wt% of methyltetrahydrophthalic anhydride.

[0049] Among them, the curing agent is composed of 60 wt% of bio-based pentamethylenediamine and 40 wt% of methylpentamethylenediamine.

[0050] A preparation method of a high bio-based epoxy modified hot mix asphalt mixture, the specific preparation steps are as follows: Step1: Preheat the aggregate and mineral powder to 160 °C for standby; Step2: Stir and mix the epoxy resin and the curing agent at room temperature to obtain a premix; Step3: High-speed shear mix the premix and the matrix asphalt at 130 °C for 30 min, with a shear speed of 3000 rpm, to obtain a homogeneous hot mix epoxy modified asphalt; Step4: Add the aggregate to the reaction kettle, under the condition of 170 °C, with a stirring speed of 4000 rpm, stir and mix for 10 min, then add the hot mix epoxy modified asphalt, stir for 20 min, and finally add the mineral powder, continue to stir for 30 min. After stirring evenly, the high bio-based epoxy modified hot mix asphalt mixture is obtained.

[0051] Comparative Example 6 A high bio-based epoxy modified hot mix asphalt mixture, including: 5 parts of epoxy resin, 3 parts of curing agent, 114 parts of matrix asphalt, 260 parts of aggregate, 30 parts of mineral powder; among them, the matrix asphalt is 70# matrix petroleum asphalt; the sum of the masses of the epoxy resin and the curing agent is 7% of the matrix asphalt.

[0052] Among them, the epoxy resin is composed of 44 wt% of epoxy soybean oil, 44 wt% of cardanol, 10 wt% of bisphenol A type E-51 epoxy resin and 2 wt% of methyltetrahydrophthalic anhydride.

[0053] Among them, the curing agent is composed of 60 wt% of bio-based pentamethylenediamine, 39.9 wt% of methylpentamethylenediamine and 0.1 wt% of 4,4'-diaminodiphenylmethane.

[0054] A preparation method of a high bio-based epoxy modified hot mix asphalt mixture, the specific preparation steps are as follows: Step1: Preheat the aggregate and mineral powder to 160 °C for standby; Step2: Stir and mix the epoxy resin and the curing agent at room temperature to obtain a premix; Step3: High-speed shear mix the premix and the matrix asphalt at 130 °C for 30 min, with a shear speed of 3000 rpm, to obtain a homogeneous hot mix epoxy modified asphalt; Step 4: Add aggregate into the reactor. Under the condition of 170 °C, stir at 4000 rpm for 10 min, then add hot mix epoxy modified asphalt and stir for 20 min. Finally, add mineral powder and continue to stir for 30 min. After stirring evenly, the high bio-based epoxy modified hot mix asphalt mixture is obtained.

[0055] Comparative Example 7 A high bio-based epoxy modified hot mix asphalt mixture, comprising: 5 parts of epoxy resin, 3 parts of curing agent, 32 parts of matrix asphalt, 260 parts of aggregate, and 30 parts of mineral powder; wherein, the matrix asphalt is 70# matrix petroleum asphalt; the sum of the mass of the epoxy resin and the curing agent is 25% of the matrix asphalt.

[0056] Among them, the epoxy resin is composed of 44 wt% of epoxy soybean oil, 44 wt% of cardanol, 10 wt% of bisphenol A type E-51 epoxy resin, and 2 wt% of methyltetrahydrophthalic anhydride.

[0057] Among them, the curing agent is composed of 60 wt% of bio-based pentamethylenediamine, 39.9 wt% of methylpentamethylenediamine, and 0.1 wt% of 4,4'-diaminodiphenylmethane.

[0058] A preparation method of a high bio-based epoxy modified hot mix asphalt mixture, and the specific preparation steps are as follows: Step 1: Preheat the aggregate and mineral powder to 160 °C for standby; Step 2: Stir and mix the epoxy resin and the curing agent at normal temperature to obtain a premix; Step 3: High-speed shear mix the premix and the matrix asphalt at 130 °C for 30 min, and the shear speed is 3000 rpm to obtain a homogeneous hot mix epoxy modified asphalt; Step 4: Add aggregate into the reactor. Under the condition of 170 °C, stir at 4000 rpm for 10 min, then add hot mix epoxy modified asphalt and stir for 20 min. Finally, add mineral powder and continue to stir for 30 min. After stirring evenly, the high bio-based epoxy modified hot mix asphalt mixture is obtained.

[0059] Performance Test The comprehensive performance of the high bio-based epoxy modified hot mix asphalt mixtures prepared in Examples 1-3 and Comparative Examples 1-7 of this application is as follows: Form Marshall specimens and rutting board specimens from the high bio-based epoxy modified hot mix asphalt mixture obtained in Example 1, cure them at 100 °C for 12 h, and then cure them at normal temperature for 48 h. After the curing is completed, refer to the "JTG E20-2011 Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" to carry out Marshall stability MS, flow value FL tests, high temperature resistance tests, and low temperature resistance tests. The specific examples are as follows: Marshall stability MS and flow value FL tests: Immerse the specimens after curing and demolding and cooling in a water bath at 60 °C to ensure complete immersion of the specimens, keep warm for 30 min, then take out the specimens and use a Marshall stability tester to conduct tests within 1 min, and record the Marshall stability MS and flow value FL of the specimens.

[0060] High temperature resistance performance test: Place the cured rutting plate specimens in a rutting tester device, set the test temperature to 60 °C, the wheel pressure to 0.7 MPa, start the wheel to reciprocate and roll for 1 h after keeping warm for 5 h, and record the dynamic stability exported by the software.

[0061] Low temperature resistance performance test: Cut the rutting plate formed by wheel rolling into prism-shaped small beams with a length of 250 mm ± 2.0 mm, a width of 30 mm ± 2.0 mm, and a height of 35 mm ± 2.0 mm, with a span of 200 mm ± 0.5 mm. After the surface is dry, place the specimens in a low temperature environment of -10 °C and keep warm for at least 4 h, then load on a three-point bending testing machine at a loading speed of 50 mm / min, record the force-displacement curve, and calculate the maximum tensile strain of the specimens.

[0062] See Table 3 below for the specific test results.

[0063] Table 1 Detailed characteristic parameter table of epoxy resin and curing agent

[0064] Table 2 Mix proportion design of high bio-based epoxy modified hot mix asphalt mixture

[0065] Table 3 Performance parameters of high bio-based epoxy modified hot mix asphalt mixture in Examples 1-3 and Comparative Examples 1-7

[0066] As can be seen from Tables 1-3, the high bio-based epoxy modified hot mix asphalt mixture prepared in this application has high Marshall stability, good bearing and structural stability, can withstand heavy loads, has a suitable flow value, good workability during construction and stable service performance, high rutting dynamic stability, strong high temperature rutting resistance and durability, large low temperature ultimate strain, excellent low temperature cracking resistance, can adapt to harsh climates, and has excellent performance. At the same time, high bio-based materials are used, and the overall bio-based content exceeds 83%, which is environmentally friendly and sustainable, and conforms to the current concept of green development and circular economy.

[0067] This specific embodiment is only an explanation of this application, and it is not a limitation of this application. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs after reading this specification, but as long as it is within the scope of the claims of this application, it is protected by the patent law.

Claims

1. A high bio-based epoxy modified hot mix asphalt mixture, characterized in that, The high bio-based epoxy modified hot mix asphalt mixture includes: 5-6 parts of epoxy resin, 3-4 parts of curing agent, 40-100 parts of base asphalt, 260-270 parts of aggregate, and 30-50 parts of mineral powder.

2. The high bio-based epoxy modified hot mix asphalt mixture according to claim 1, characterized in that, The sum of the masses of the epoxy resin and the curing agent is 10-20% of the base asphalt.

3. The high bio-based epoxy modified hot mix asphalt mixture according to claim 1, characterized in that, The epoxy resin is composed of 44-44.9 wt% of epoxidized soybean oil, 44-45 wt% of cardanol, 10 wt% of bisphenol A type E-51 epoxy resin, and 0.1-2 wt% of crosslinking agent.

4. The high bio-based epoxy modified hot mix asphalt mixture according to claim 3, characterized in that The crosslinking agent is methyltetrahydrophthalic anhydride.

5. The high bio-based epoxy modified hot mix asphalt mixture according to claim 1, wherein The curing agent is composed of 60-70 wt% of bio-based pentamethylenediamine, 29-39.9 wt% of methylpentamethylenediamine, and 0.1-1 wt% of curing accelerator.

6. The high bio-based epoxy modified hot mix asphalt mixture according to claim 5, characterized in that, The curing accelerator is one or more of 4,4'-diaminodiphenyl sulfone, 4,4'-diaminodiphenyl methane, and 2,4,6-tris(dimethylaminomethyl)phenol.

7. The high bio-based epoxy modified hot mix asphalt mixture according to claim 1, wherein The base asphalt is 70# base petroleum asphalt.

8. A preparation method of a high bio-based epoxy modified hot mix asphalt mixture according to any one of claims 1-7, characterized in that, The specific preparation steps are as follows: Step1: Preheat the aggregate and mineral powder to 160-170 °C for standby; Step2: Stir and mix the epoxy resin and the curing agent at room temperature to obtain a premix; Step3: High-speed shear mix the premix and the base asphalt at a temperature of 130-150 °C to obtain a homogeneous hot mix epoxy modified asphalt; Step4: Add the aggregate to the reaction kettle, stir and mix at a temperature of 170-180 °C, then add the hot mix epoxy modified asphalt, continue to stir, and finally add the mineral powder and stir evenly to obtain the high bio-based epoxy modified hot mix asphalt mixture.

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