A bio-based compatible and stable particle, its preparation method and application

Abstract

The present invention discloses a bio-based compatible stable particle, its preparation method and application, belonging to the technical field of road asphalt material preparation. A bio-based compatible stable particle, the raw materials of which include a thermally triggered bio-based crosslinking agent, a bio-based nanocomposite material, a tackifier, a titanate coupling agent and an antioxidant. The present invention uses a thermally triggered bio-based crosslinking agent and a bio-based nanocomposite material to replace the crosslinking agents such as sulfur and polyphosphoric acid commonly used in the prior art, and prepares them into bio-based compatible stable particles that can be directly put into use, having obvious advantages in material stability and construction convenience. The application of bio-based materials can effectively reduce the emission of harmful gases during the production and application of high-viscosity asphalt, and improve the construction environment. At the same time, the biodegradable characteristics of bio-based materials provide strong support for environmental protection, significantly reducing the long-term pollution risk after the use of materials.

Description

Technical Field

[0001] The present invention belongs to the technical field of road asphalt material preparation, and particularly relates to a bio-based compatible stable particle, a preparation method thereof, and an application thereof. Background Art

[0002] With the continuous development of the road material engineering, the demand for high-performance road materials is increasing day by day. Styrene-butadiene-styrene (SBS) has become a popular choice for improving the performance of asphalt due to its excellent elasticity and resilience. However, although SBS shows good performance in modified asphalt, its application still has some significant limitations. Among them, the compatibility problem between high-content SBS and asphalt is particularly prominent in the modification research. The differences in physical and chemical properties between SBS and asphalt lead to their thermodynamic incompatibility, and the formed high-viscosity asphalt system is prone to stratification and phase separation phenomena, which not only reduces the performance of high-viscosity asphalt but also significantly affects its stability during construction and service.

[0003] Patent CN102977619A uses raw materials such as acidification promoter M waste residue, sulfur, promoter, and resin to compound a polymer for the stability of modified asphalt, and the waste residue can be used to promote vulcanization to solve the problem of waste residue treatment. Patent CN118185328A adds sulfur and light oil fractions to SBS asphalt to promote the chemical grafting reaction and solubility between SBS and asphalt, and is supplemented with substances such as vulcanization accelerator and dispersant to improve the development and uniformity of the cross-linked network structure. These methods can improve the compatibility and stability problems of high-viscosity asphalt to a certain extent, but the potential adverse effects of chemical additives such as sulfur and polyphosphoric acid used on the environment cannot be ignored. Especially in the context of the current global promotion of green building and environmental protection concepts, this problem is particularly important. In addition, these disclosed methods often involve complex preparation processes, which not only increase the production cost but also pose challenges to the operability of process implementation and the convenience of on-site construction. For many actual application occasions, simplifying the modification process and reducing the technical threshold are the keys to improving the application efficiency of materials. Therefore, while seeking to improve compatibility and stability, it is also necessary to take into account environmental protection and economy, and develop a green and simple modification path. Summary of the Invention

[0004] The purpose of the present invention is to provide a bio-based compatible stable particle, a preparation method thereof, and an application thereof to solve the problems existing in the above-mentioned prior art. The present invention uses a thermally triggered bio-based cross-linking agent as a cross-linking agent to enhance the chemical cross-linking degree between high-parameter SBS and asphalt, and uses a bio-based nanocomposite to enhance the mechanical properties and rheological characteristics of high-viscosity asphalt, thereby obtaining a high-viscosity asphalt material with excellent environmental protection and usability.

[0005] One of the technical solutions:

[0006] A bio-based compatible and stable particle, the raw materials of which include a thermally triggered bio-based crosslinking agent, a bio-based nanocomposite, a tackifier, a titanate coupling agent, and an antioxidant.

[0007] Preferably, the mass ratio of the thermally triggered bio-based crosslinking agent, the bio-based nanocomposite, the tackifier, the titanate coupling agent, and the antioxidant is (3-5):(3-6):(3-5):(2-4):1.

[0008] Preferably, the raw materials of the thermally triggered bio-based crosslinking agent include a polyisocyanate compound, a bio-based polyol, dibutyltin dilaurate, and a solid blocking agent; wherein the polyisocyanate compound is selected from 4,4'-diphenylmethane diisocyanate or isophorone diisocyanate; the bio-based polyol is selected from epoxy castor oil, epoxy soybean oil, or epoxy linseed oil; the solid blocking agent is selected from 3,5-dimethylpyrazole DMP, dimethylglyoxime, or sodium bisulfite.

[0009] Preferably, the preparation method of the thermally triggered bio-based crosslinking agent comprises the following steps: under a nitrogen atmosphere, dibutyltin dilaurate is added dropwise to a mixture of the polyisocyanate compound and the bio-based polyol, heated and stirred for reaction, then a solution containing the solid blocking agent is added dropwise, and stirring reaction is continued. The reaction product is dried under vacuum to obtain the thermally triggered bio-based crosslinking agent.

[0010] More preferably, the temperature of the heating and stirring reaction is 50-80 °C; the temperature of the continued stirring reaction is 50-80 °C, and the time is 3 h; the temperature of the vacuum drying is 80 °C, and the time is 2 h; the solvent in the solution containing the solid blocking agent is selected from N,N-dimethylacetamide or N,N-dimethylsulfinamide.

[0011] More preferably, the ratio of the -NCO groups in the polyisocyanate compound, the -OH groups in the bio-based polyol, and the -OH groups in the solid blocking agent is 1:(0.25-0.5):(0.6-0.9).

[0012] Limiting the above group ratio is to obtain a prepolymer with terminal isocyanate groups and ensure that its reaction activity can be completely protected by the solid blocking agent, so as to obtain a thermally triggered bio-based crosslinking agent with stable performance.

[0013] The present invention uses a thermally triggered bio-based crosslinking agent to comprehensively improve the compatibility stability, durability, and high-temperature rheological properties of high-viscosity asphalt. On the one hand, the use of bio-based materials significantly reduces environmental pollution and enhances sustainability, meeting the modern environmental protection concept. On the other hand, the solid encapsulation form effectively protects the reactivity of the terminal -NCO of the bio-based crosslinking agent, enabling it to be prepared into solid particles for convenient practical operation and storage. The thermally triggered bio-based crosslinking agent can generate a bio-based crosslinking agent with high reactivity under the high-temperature trigger of 160 - 190 °C. The preparation of high-viscosity asphalt generally requires high temperatures to ensure the full miscibility of high-content polymers and asphalt. Under such conditions, when the thermally triggered bio-based crosslinking agent is added to high-viscosity asphalt, its reactivity can be successfully triggered, thereby undergoing a chemical crosslinking reaction with the biphasic components (SBS phase and asphalt phase) in the high-viscosity asphalt.

[0014] The thermally triggered bio-based crosslinking agent provided by the present invention is a non-toxic and stable solid powder, which can generate a bio-based crosslinking agent with high reactivity under the high-temperature trigger of 160 - 190 °C. The terminal -NCO groups of the bio-based crosslinking agent can actively participate in the chemical modification of high-viscosity asphalt, thereby enhancing the performance of high-viscosity asphalt.

[0015] Preferably, the raw materials of the bio-based nanocomposite include nano-fillers, bio-based organic acids, and catalysts. Among them, the nano-fillers are selected from nano-OvPOSS, nano-calcium carbonate, or nano-silica; the bio-based organic acids are selected from oleic acid, stearic acid, palmitic acid, or linoleic acid; the catalysts are selected from triethylaminosilane, coupling agent A185, or sodium hydroxide.

[0016] Preferably, the preparation method of the bio-based nanocomposite includes the following steps: adding the nano-fillers to an organic solvent, mixing and preheating, then adding the bio-based organic acids and catalysts, stirring and reacting, filtering, washing, and vacuum drying to obtain the bio-based nanocomposite.

[0017] More preferably, the preheating temperature is 90 - 100 °C; the stirring reaction time is 2 h; the washing is to wash the filtrate with ethanol and distilled water in sequence; the vacuum drying temperature is 80 - 100 °C, and the time is 2 - 4 h.

[0018] More preferably, the mass ratio of the nano-fillers to the bio-based organic acids is (1 - 3)∶(2 - 7).

[0019] The organic solvent is selected from dichloromethane.

[0020] The present invention uses bio-based nanocomposites to improve the internal molecular structure of asphalt at the microscopic level, enhance its toughness and ductility, and reduce the risk of fatigue damage. The surface functionalization of nanomaterials with bio-based organic acids can enhance the lipophilicity of the nanomaterial surface, promote the interaction between the nanomaterial and asphalt, and enhance the interfacial bonding performance, making it easier to disperse in the asphalt matrix, reducing aggregation and agglomeration phenomena, and thus improving the uniformity, stability, and overall performance of high-viscosity asphalt. In addition, bio-based organic acids can also reduce the hydrophilicity of nanomaterials, thereby enhancing the ability of asphalt materials to resist water erosion.

[0021] Preferably, the tackifier is C9 petroleum resin; the antioxidant is obtained by compounding UV 531, nano-TiO2, Irganox 1010, and Irgafos 168 in a mass ratio of 1:6:0.3:0.6.

[0022] Technical solution two:

[0023] A method for preparing the above-mentioned bio-based compatible and stable particles includes the following steps: weighing the raw materials, mixing the thermally triggered bio-based crosslinking agent, bio-based nanocomposite, tackifier, antioxidant, and titanate coupling agent evenly, injecting the obtained mixture into a twin-screw extruder, and performing melt mixing at 100-130 °C for 3-6 minutes, and then preparing the bio-based compatible and stable particles through extrusion into filaments, pelletizing, and drying.

[0024] Technical solution three:

[0025] An application of the above-mentioned bio-based compatible and stable particles in the preparation of modified high-viscosity asphalt.

[0026] Technical solution four:

[0027] A bio-based compatible and stable particle modified high-viscosity asphalt, by mass, includes the following raw materials: 90-100 parts of matrix asphalt, 7.5-10 parts of SBS, and 15-20 parts of the above-mentioned bio-based compatible and stable particles.

[0028] The special structure of the titanate coupling agent in the bio-based compatible and stable particles enables it to combine with the polar parts of the bio-based nanocomposite and SBS molecules and the non-polar parts of asphalt, thereby forming a good interfacial bridge between the bio-based nanocomposite, SBS, and asphalt. The titanate coupling agent can also effectively promote the combination of various phase substances by providing a larger contact area and chemical interactions such as hydrogen bonds and van der Waals forces, thereby reducing the risk of phase separation and aggregation and improving the overall performance of high-viscosity asphalt.

[0029] Technical solution five:

[0030] A preparation method of the above-mentioned bio-based compatible and stable particle modified high-viscosity asphalt, comprising the following steps: weighing raw materials, and sequentially putting SBS and the above-mentioned bio-based compatible and stable particles into matrix asphalt, and preparing the bio-based compatible and stable particle modified high-viscosity asphalt through shearing, stirring and constant-temperature development.

[0031] Preferably, the temperature of the constant-temperature development is 160-190°C.

[0032] Compared with the prior art, the present invention has the following advantages and technical effects:

[0033] The present invention uses a thermally triggered bio-based crosslinking agent and a bio-based nanocomposite to replace crosslinking agents such as sulfur and polyphosphoric acid commonly used in the prior art, and prepares them into bio-based compatible and stable particles that can be directly put into use, having obvious advantages in material stability and construction convenience. The application of bio-based materials can effectively reduce the emission of harmful gases during the production and application of high-viscosity asphalt, and improve the construction environment. At the same time, the biodegradable characteristics of bio-based materials provide strong support for environmental protection, significantly reducing the long-term pollution risk after material use.

[0034] The solid sealant effectively protects the reaction activity of the terminal -NCO of the triggered bio-based crosslinking agent, facilitating actual operation and long-term storage; the high-temperature environment (160°C - 180°C) during the preparation process of high-viscosity asphalt can successfully activate the reaction activity of the triggered bio-based crosslinking agent, enabling it to participate in the chemical modification of high-viscosity asphalt in a timely manner, thereby forming a more developed and stable chemical crosslinking network structure.

[0035] Each component in the bio-based compatible and stable particles provided by the present invention can produce a synergistic effect, jointly promoting the enhancement of the compatibility and stability of high-viscosity asphalt and the improvement of the overall performance. The bio-based nanocomposite can be evenly dispersed in high-viscosity asphalt, enabling it to form a more uniform and dense network structure, thereby improving the overall strength and toughness of high-viscosity asphalt; the titanate coupling agent can act as a "bridge" to establish an effective mutual connection between SBS, the bio-based nanocomposite and asphalt, thereby improving the compatibility and stability of the high-viscosity asphalt system.

[0036] The present invention provides a bio-based compatible and stable particle applicable to high-viscosity asphalt, and improves the overall performance of road engineering materials by introducing renewable materials, providing a sustainable solution for environmental protection road construction, which not only conforms to the development trend of modern materials science, but also responds to the increasingly strong global environmental protection needs. Description of the Drawings

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 It is a flowchart for the preparation of a bio - based compatible stable particle provided by the present invention. Specific embodiments

[0039] Now, various exemplary embodiments of the present invention will be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, characteristics, and implementation schemes of the present invention.

[0040] It should be understood that the terms used in the present invention are only for describing specific embodiments and are not used to limit the present invention. Additionally, for the numerical ranges in the present invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each intermediate value within any stated value or stated range, as well as each smaller range between any other stated value or intermediate value within the stated range, is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded from the range.

[0041] Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention pertains. Although the present invention only describes preferred methods and materials, any methods and materials similar or equivalent to those described herein can also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In case of conflict with any incorporated document, the content of this specification shall prevail.

[0042] Without departing from the scope or spirit of the present invention, various improvements and changes can be made to the specific embodiments of the present invention specification, which are obvious to those skilled in the art. Other embodiments obtained from the specification of the present invention are obvious to those skilled in the art. The specification and embodiments of this application are only exemplary.

[0043] Regarding the terms "comprising", "including", "having", "containing", etc. used herein, they are all open - ended terms, meaning including but not limited to.

[0044] In the embodiments of the present invention, "parts" shall be "parts by mass" unless otherwise specified.

[0045] Sources of raw materials in the embodiments and comparative examples of the present invention:

[0046] The matrix asphalt is Shell 70 asphalt produced by Zhenjiang Shell (China) Asphalt Co., Ltd.;

[0047] 4,4'-Diphenylmethane diisocyanate and dibutyltin dilaurate are purchased from Anhui Zesheng Technology Co., Ltd.;

[0048] The nano calcium carbonate is a colorless, odorless white powder and is purchased from Beijing Merida Technology Co., Ltd.;

[0049] Oleic acid is purchased from Xilong Chemical Reagent Co., Ltd.;

[0050] The titanate coupling agent is provided by Hangzhou Jessica Chemical Co., Ltd.;

[0051] The UV 531, nano-TiO2, Irganox 1010 and Irgafos 168 for preparing the antioxidant are purchased from Macklin Biochemical Co., Ltd.;

[0052] N,N-Dimethylacetamide, 3,5-dimethylpyrazole, aromatic oil and polyphosphoric acid are purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0053] Example 1 Preparation method of a thermally triggered bio-based crosslinking agent

[0054] S1: Under a nitrogen protection atmosphere, 0.3 mol of 4,4'-diphenylmethane diisocyanate and 0.1 mol of epoxy castor oil are successively added into a three-necked flask, and two drops of the catalyst dibutyltin dilaurate are added dropwise. The obtained mixture is stirred and reacted at 50 °C for 3 h;

[0055] S2: 0.24 mol of 3,5-dimethylpyrazole is dissolved in an N,N-dimethylformamide solution, so that the ratio of the -NCO group in 4,4'-diphenylmethane diisocyanate, the -OH group in epoxy castor oil and the -OH group in 3,5-dimethylpyrazole is 1∶0.25∶0.6. The obtained N,N-dimethylformamide solution is added dropwise to the reaction solution obtained in S1, and the stirring reaction is continued for 3 h;

[0056] S3: The product obtained in S3 is dried in a vacuum drying oven at 80 °C for 2 h to prepare a thermally triggered bio-based crosslinking agent.

[0057] Example 2 Preparation method of a bio-based nanocomposite

[0058] S1: 10 g of nano calcium carbonate is added to 100 mL of dichloromethane solution, mixed evenly and preheated to 90 °C, then 20 mL (21 g) of oleic acid and 2 g of triethylaminosilane are added, and the stirring reaction is carried out for 2 h;

[0059] S2: Filter and separate the reactants obtained in S1 using a filter, and wash them successively with ethanol and distilled water. Vacuum dry the product at 80 °C for 3 h to prepare a biobased nanocomposite.

[0060] Example 3: A method for preparing biobased compatible and stable particles

[0061] S1: Mix 3 g of the thermally triggered biobased crosslinker prepared in Example 1, 5 g of the biobased nanocomposite prepared in Example 2, 3 g of C9 petroleum resin, 1 g of an antioxidant (prepared by compounding UV 531, nano-TiO2, Irganox 1010, and Irgafos 168 in a mass ratio of 1:6:0.3:0.6), and 2 g of a titanate coupling agent uniformly in a mixer;

[0062] S2: Inject the mixture obtained in S1 into a twin-screw extruder, melt and knead it at 120 °C for 4 min, and obtain biobased compatible and stable particles after extrusion into filaments, pelletizing, and drying.

[0063] Figure 1 This is a process flow chart for preparing biobased compatible and stable particles provided by the present invention.

[0064] Examples 4 - 6: A method for preparing biobased compatible and stable particle-modified high-viscosity asphalt

[0065] Table 1

[0066] Material Example 4 Example 5 Example 6 Matrix asphalt (g) 100 95 90 SBS (g) 10 8 7.5 Bio-based compatible stable particles (g) 15 18 20

[0067] S1: Weigh each raw material according to the mass fractions in Table 1.

[0068] S2: Heat the matrix asphalt to a molten state at 180 °C, then add SBS in small amounts and multiple times, and shear the mixture with a mechanical shearer at a shear rate of 2000 r / min for 20 min;

[0069] S3: Add the biobased compatible and stable particles prepared in Example 3 to the mixture, and increase the shear rate to 5000 r / min and continue shearing for 1 h;

[0070] S4: Transfer the mixture obtained in S3 to a mechanical stirrer and stir it at a speed of 700 r / min for 30 minutes;

[0071] S5: Place the mixture obtained in S4 in an oven at 170 °C for 30 min to obtain biobased compatible and stable particle-modified high-viscosity asphalt.

[0072] Comparative Example 1

[0073] S1: Heat 100 g of matrix asphalt to the molten state at 180 °C, add 5 g of aromatic oil, then add 7.5 g of SBS in small amounts multiple times, and use a mechanical shearer to shear the mixture at a shear speed of 2000 r / min for 20 min;

[0074] S2: Add 0.75 g of polyphosphoric acid (PPA) to the mixture obtained in S1 and increase the shear speed to 5000 r / min and continue shearing for 1 h;

[0075] S3: Transfer the mixture obtained in S2 to a mechanical stirrer and stir at a speed of 700 r / min for 30 minutes;

[0076] S4: Place the mixture in an oven at 170 °C for 30 min to obtain modified high-viscosity asphalt.

[0077] Comparative Example 2

[0078] Same as Example 4, except that the thermally triggered bio-based crosslinking agent was not added to the bio-based compatible and stable particles prepared in Example 3.

[0079] Comparative Example 3

[0080] Same as Example 4, except that the bio-based nanocomposite was not added to the bio-based compatible and stable particles prepared in Example 3.

[0081] Comparative Example 4

[0082] Same as Example 4, except that the titanate coupling agent was not added to the bio-based compatible and stable particles prepared in Example 3.

[0083] Performance Test

[0084] Compatibility and Stability Test:

[0085] According to the "Technical Specifications for Highway Asphalt Pavement Construction" (JTG F40 - 2004), a standard segregation experiment was conducted on the high-viscosity asphalt materials prepared in Examples 4 - 6 and Comparative Examples 1 - 4. The softening point difference between the upper and lower parts of the asphalt in the aluminum foil tube was tested after the asphalt samples were vertically stored in an oven at 163 °C for 48 h. The test results are shown in Table 2.

[0086] Table 2

[0087]

[0088] It can be seen from the test data in Table 2 that the traditional method of adding light oil and polyphosphoric acid in Comparative Example 1 cannot make the softening point difference of high-viscosity asphalt meet the specification requirement of less than 2.5°C, while the bio-based compatible and stable particles proposed in the present invention can effectively improve the compatibility and stability of high-viscosity asphalt. By comparing the softening point differences between Examples 4-6 and Comparative Examples 1-4, it is confirmed that the synergistic effect of each component in the bio-based compatible and stable particles provided by the present invention can effectively improve the compatibility and stability of high-viscosity asphalt.

[0089] Road performance test:

[0090] To study the influence of the bio-based compatible and stable particles prepared in the present invention on the high-temperature performance of high-viscosity asphalt, in accordance with the ASTM D 7175 (AASHTO T 31509) specification, the present invention conducted multiple creep and recovery (MSCR) tests at 64°C and zero-shear viscosity (ZSV) tests at 60°C by using a DSR instrument; according to the AASHTO TP 101 specification, linear amplitude sweep (LAS) tests were conducted to measure the fatigue life times of the high-viscosity asphalt prepared in Examples 4-6 and Comparative Examples 1-4 under the conditions of 20°C and 2.5% strain. The test results are shown in Table 3. The elastic recovery rate refers to the degree of rebound of a material after releasing the pressure when it is subjected to a certain pressure at a certain temperature, which reflects the recovery ability of the material after being stressed; the shear viscosity (ZSV) is an important index for evaluating the anti-flowability and stability of asphalt under long-term load. A higher ZSV indicates that the asphalt has stronger anti-deformation ability; the fatigue life calculated based on the LAS experiment is a key index for evaluating the performance of asphalt under repeated load. A higher fatigue life indicates that the asphalt material has more excellent durability and anti-cracking performance under dynamic loading conditions, indicating that it can better maintain the structural integrity and service performance in practical applications.

[0091] Table 3

[0092]

[0093] It can be seen from the comparison in Table 3 that compared with the modified high-viscosity asphalt prepared by the traditional method of adding light oil and polyphosphoric acid in Comparative Example 1, the bio-based compatible and stable particles prepared by adding Examples 4-6 of the present invention can effectively improve the high-temperature rheological properties and anti-fatigue properties of high-viscosity asphalt. From the experimental data obtained in Comparative Examples 1-4, it can be seen that the synergistic effect of each component in the bio-based compatible and stable particles provided by the present invention can effectively improve the high-temperature rheological properties and anti-fatigue properties of high-viscosity asphalt.

[0094] The above are only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A bio-based compatible and stable particle modified high-viscosity asphalt, characterized in that, It includes the following raw materials by mass parts: 90 - 100 parts of matrix asphalt, 7.5 - 10 parts of SBS, and 15 - 20 parts of bio - based compatible stable particles; The raw materials of the bio - based compatible stable particles include a thermally triggered bio - based cross - linker, a bio - based nanocomposite, a tackifier, a titanate coupling agent, and an antioxidant; the mass ratio of the thermally triggered bio - based cross - linker, the bio - based nanocomposite, the tackifier, the titanate coupling agent, and the antioxidant is (3 - 5)∶(3 - 6)∶(3 - 5)∶(2 - 4)∶1; The raw materials of the bio - based nanocomposite include a nano - filler, a bio - based organic acid, and a catalyst; The preparation method of the bio - based nanocomposite includes the following steps: adding the nano - filler into an organic solvent, mixing and preheating, then adding the bio - based organic acid and the catalyst, stirring for reaction, filtering, washing, and vacuum drying to obtain the bio - based nanocomposite; The raw materials of the thermally triggered bio - based cross - linker include a polyisocyanate compound, a bio - based polyol, dibutyltin dilaurate, and a solid blocking agent.

2. The bio-based compatible and stable particle modified high-viscosity asphalt according to claim 1, wherein The preparation method of the thermally triggered bio - based cross - linker includes the following steps: under a nitrogen atmosphere, dropping dibutyltin dilaurate into the mixture of the polyisocyanate compound and the bio - based polyol, heating and stirring for reaction, then dropping a solution containing a solid blocking agent, continuing to stir for reaction, and vacuum drying the reaction product to obtain the thermally triggered bio - based cross - linker.

3. The bio-based compatible and stable particle modified high-viscosity asphalt according to claim 1, wherein The preparation method of the bio - based compatible stable particles includes the following steps: weighing the raw materials, mixing the thermally triggered bio - based cross - linker, the bio - based nanocomposite, the tackifier, the antioxidant, and the titanate coupling agent evenly, injecting the obtained mixture into a twin - screw extruder, melt - kneading at 100 - 130 °C for 3 - 6 min, extruding into filaments, cutting into pellets, and drying to obtain the bio - based compatible stable particles.

4. A method for preparing a bio-based compatible and stable particle-modified high-viscosity asphalt according to any one of claims 1-3, characterized in that, includes the following steps: weighing the raw materials, successively adding SBS and the bio - based compatible stable particles described in any one of claims 1 - 3 into the matrix asphalt, and preparing the bio - based compatible stable particle - modified high - viscosity asphalt through shearing, stirring, and constant - temperature development.

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