Preparation method of near-zero pollution chain pyrolysis liquefaction rubber powder-based bioasphalt

Abstract

This invention discloses a method for preparing near-zero pollution chain-linked pyrolysis liquefaction rubber powder-based bio-asphalt, comprising the following steps: 1) mixing waste oil-based bio-asphalt, rubber powder, and montmorillonite evenly, and allowing it to swell to obtain a mixture; 2) pyrolyzing the swollen mixture to obtain pyrolysis liquefaction product A; 3) adding rubber powder to pyrolysis liquefaction product A in batches, mixing evenly, and reacting each batch for 10-40 minutes to obtain pyrolysis liquefaction product B; 4) mixing pyrolysis liquefaction product B with petroleum asphalt evenly, then adding linear SBS copolymer and mixing evenly, while simultaneously shearing, followed by swelling and development for 1-3 hours to obtain an asphalt blend; 5) sequentially adding sulfur and montmorillonite to the asphalt blend, mixing evenly, and continuing development for 1-3 hours to obtain near-zero pollution chain-linked pyrolysis liquefaction rubber powder-based bio-asphalt. The rubber powder-based bio-asphalt prepared by this invention has excellent high and low temperature performance, thermal storage stability, workability, and good environmental performance.

Description

Technical Field

[0001] This invention belongs to the field of road asphalt material technology, specifically relating to a method for preparing near-zero pollution chain-linked pyrolysis liquefaction rubber powder-based bio-asphalt. Background Technology

[0002] Bio-asphalt, as a substitute for road asphalt binder, has received increasing attention in recent years. Bio-asphalt generally exhibits excellent low-temperature crack resistance, water damage resistance, and aging resistance, but its high-temperature rutting resistance is poor. To compensate for these shortcomings, adding polymer modifiers to bio-asphalt is a feasible technical solution. For example, patent number CN114106572 A discloses a DOP / SBS bio-asphalt modifier and a method for preparing modified asphalt, which uses dioctyl phthalate, SBS, and C9 petroleum resin to prepare the bio-asphalt modifier, thereby solving the problem of poor high-temperature performance of traditional bio-asphalt. However, relying on large amounts of expensive polymers would result in excessively high costs.

[0003] Modifying asphalt with rubber powder can effectively improve its road performance and make full use of waste tire resources. The technical solution involves mixing the rubber powder into base asphalt at 170-190℃ and stirring for 1 hour until fully swollen. The resulting rubberized asphalt exhibits excellent resistance to high-temperature rutting and fatigue, but its low-temperature crack resistance is poor, with a ductility of approximately 10 cm at 5℃, and a low-temperature performance grade typically of PG-22. Furthermore, the incompatibility between rubber powder and asphalt leads to unstable storage, hindering its performance and quality control. Rubberized asphalt is primarily produced and used on construction sites, releasing large amounts of harmful volatile organic compounds such as polycyclic aromatic hydrocarbons and benzothiazoles into the environment, severely polluting the atmosphere and threatening the health of construction workers.

[0004] To address the compatibility issue between rubber powder and asphalt, patent CN 106674589A discloses a method for desulfurizing rubber powder using waste edible oil. This method aims to change the blending state of the rubber powder in asphalt, transforming it from a swollen state to a desulfurized and degraded state, thereby solving the compatibility problem. However, the resulting desulfurized rubber powder-modified asphalt exhibits poor high-temperature performance, with a softening point below 59.3℃ and high-temperature performance grades all below PG76. Furthermore, the process of desulfurizing rubber powder using waste edible oil not only generates harmful volatile organic compounds from the rubber powder but also produces a large amount of oil fumes, posing a significant threat to atmospheric pollution. Summary of the Invention

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the main objective of this invention is to provide a near-zero pollution chain-linked pyrolysis liquefaction rubber powder-based bio-asphalt preparation method, to address the problems of poor high-temperature performance of existing bio-asphalt, high construction difficulty, poor thermal storage stability, harmful volatile matter pollution of the atmosphere, and unsatisfactory high-temperature performance of desulfurized rubber powder-modified asphalt.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A method for preparing near-zero pollution chain-linked pyrolysis liquefaction rubber powder-based bio-asphalt includes the following steps:

[0008] 1) Place waste oil-based bio-asphalt, rubber powder and montmorillonite in a sealed reactor at room temperature and mix evenly. Let stand and swell for 2-6 hours to obtain a mixture.

[0009] 2) The swollen mixture is then pyrolyzed to obtain pyrolyzed liquefaction product A;

[0010] 3) Add the pyrolysis liquefaction powder to the pyrolysis liquefaction product A in portions. After each addition of the liquefaction powder, mix it evenly and react for 10-40 minutes to obtain the pyrolysis liquefaction product B.

[0011] 4) Mix the pyrolysis liquefaction B with petroleum asphalt evenly, then add linear SBS copolymer and mix evenly. At the same time, use a high-speed shearing device to shear. After shearing, swelling and development will take 1-3 hours to obtain asphalt blend.

[0012] 5) After adding sulfur and montmorillonite to the asphalt blend in sequence and mixing evenly, continue to develop for 1-3 hours to obtain near-zero pollution chain-linked liquefied rubber powder-based bio-asphalt.

[0013] In the aforementioned preparation method, through the chain-like pyrolysis liquefaction process in steps 2) and 3), the rubber powder is first pyrolyzed in a sufficient amount of bio-asphalt. The resulting liquid rubber molecules and bio-asphalt serve as pyrolysis solvents for subsequently added rubber powder, continuing the pyrolysis liquefaction process. This chain-like pyrolysis liquefaction process results in pyrolyzed rubber powder with varying degrees of pyrolysis (heavy, moderate, and shallow), forming a tiered distribution. This effectively solves the problem of poor high-temperature performance of modified asphalt caused by excessive desulfurization and pyrolysis of rubber powder in existing desulfurized rubber powder modified asphalt technologies.

[0014] In some specific embodiments, the mass ratio of bio-asphalt, rubber powder and montmorillonite in step 1) is (40-60):(40-60):(3-6).

[0015] In some specific embodiments, the pyrolysis liquefaction conditions in step 2) are as follows: the swollen mixture is pyrolyzed and liquefied at a stirring speed of 150-300 r / min and a temperature of 250-270°C for 10-40 minutes.

[0016] In some specific embodiments, the characteristic is that after adding the adhesive powder in step 3), the mass ratio of the biological matrix to the adhesive powder in the system is (2-5):(4-10).

[0017] In some specific embodiments, in step 4), the mass ratio of the pyrolysis liquefaction B, petroleum bitumen and linear SBS copolymer is (10-30):(70-90):(2-4).

[0018] In some specific embodiments, in step 4), the shearing conditions of the high-speed shearing device are: shearing temperature of 150-200℃, shearing rate of 4000-6000rpm, and shearing time of 30-45 minutes.

[0019] In some specific embodiments, the mass ratio of the asphalt blend, sulfur and montmorillonite in step 5) is 100:(0.2-0.6):(2-4).

[0020] In some specific embodiments, the rubber powder is waste tire rubber powder with a mesh size of 30-80; the bio-asphalt is waste oil-based bio-asphalt.

[0021] Compared with the prior art, the present invention has at least the following advantages:

[0022] 1) The near-zero pollution chain-type pyrolysis liquefied rubber powder-based bio-asphalt preparation method provided by the present invention changes the distribution mode of the degree of rubber powder pyrolysis in the traditional desulfurization pyrolysis rubber powder modifier, changing it from an average distribution to a stepped distribution, effectively improving the high-temperature performance of desulfurization pyrolysis rubber powder modified asphalt, and without the need for a large amount of polymer modifier, saving material costs.

[0023] 2) This invention enables bio-asphalt, rubber powder, SBS and petroleum asphalt to undergo a cross-linking reaction to obtain bio-rubber powder modified asphalt with stable morphology and structure, further improving the high and low temperature performance of rubber powder-based bio-asphalt and solving the problem of unstable thermal storage of rubber powder modified asphalt.

[0024] 3) Compared with traditional rubber asphalt technology, this invention removes some polluting volatiles by cracking and liquefying the rubber powder before using it to modify asphalt. At the same time, montmorillonite is used as an adsorbent for harmful volatiles to adsorb and inhibit the volatiles generated during the cracking and liquefaction process and the modification of asphalt. This significantly reduces the content of volatile organic compounds in the modified asphalt processing and has significant environmental benefits. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to specific embodiments. The following embodiments are merely descriptive and not limiting, and should not be used to limit the scope of protection of the present invention.

[0026] When a quantity, concentration, or other value or parameter is described as a range, preferred range, or preferred upper and lower limits, it should be understood that it is equivalent to specifically disclosing any range by combining any pair of upper or preferred values ​​with any lower or preferred values, regardless of whether the range is specifically disclosed. Unless otherwise stated, the numerical range values ​​listed herein include the endpoints of the range and all integers and fractions within that range.

[0027] Unless otherwise stated, all percentages, parts, ratios, etc. in this document are by weight.

[0028] The materials, methods, and embodiments described herein are exemplary and should not be construed as limiting unless otherwise stated.

[0029] In the following examples, the bio-asphalt used is waste oil-based bio-asphalt, specifically the residue after distilling neutral oil in the distillation tower during the biodiesel refining process, purchased from Chongqing Yubang New Energy Technology Co., Ltd.; the rubber powder used is waste tire rubber powder with a mesh size of 30-80 mesh, purchased from Sichuan Zhongneng Rubber Powder Co., Ltd.; the montmorillonite used is purchased from Hebei Chengzun Mineral Products Processing Plant, with a purity of 99%, an organic treatment agent content of 38%, and a specific gravity of 1.9 g / cm³. 3 Moisture content 2%, bulk density 280 kg / m³ 3 The petroleum asphalt is 70# petroleum asphalt, purchased from Maoming Weilong Petrochemical Co., Ltd.; the linear SBS copolymer is purchased from China Petrochemical Corporation, and its performance indicators are: block ratio (S / B) 30 / 70, Shore hardness (A) 72, 300% tensile stress 2.6, tensile strength 16.8MPa, elongation at break 790%, permanent deformation at break 35%, volatile matter 0.64%, and melt flow rate 2.10g / 10min; the sulfur used is industrial sulfur, which acts as a stabilizer and crosslinking agent to cause crosslinking reaction between bio-asphalt, rubber powder, linear SBS copolymer and petroleum asphalt, forming a stable phase and structure; the montmorillonite used is an adsorbent to adsorb alicyclic, aromatic and heterocyclic compounds, non-methane volatile organic compounds, sulfides, polycyclic aromatic hydrocarbons, etc. generated during the pyrolysis and liquefaction of rubber powder, as well as asphalt fumes and volatile organic compounds generated during asphalt production.

[0030] In the following embodiments, the penetration, softening point, ductility, Brookfield rotational viscosity, segregation index, RTFOT post-rutting factor, PAV post-fatigue factor, PAV post-stiffness modulus, and PAV post-m value of the near-zero pollution chain-pyrolysis liquefied rubber powder-based bioasphalt were tested according to the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011); the recovery rate and irrecoverable creep compliance were tested according to the "Standard Method of Test for Multiple Stress Creep Recovery (MSCR) Test of Asphalt Binder Using a Dynamic Shear Rheometer (DSR)" (AASHTOTP 70-12); the benzene soluble content was tested according to the "Determination of Benzene Soluble Matter in Exhaust Gas from Stationary Sources by Soxhlet Extraction-Gravimetric Method" (HJ 690-2014); and the benzothiazole content was quantitatively tested using gas chromatography-mass spectrometry.

[0031] Example 1

[0032] The near-zero pollution chain-linked pyrolysis liquefaction rubber powder-based bio-asphalt preparation method provided by the present invention includes the following steps:

[0033] 1) Add 40 parts by weight of waste oil-based bio-asphalt, 60 parts by weight of rubber powder (30 mesh) and 3 parts by weight of montmorillonite to a room temperature sealed reactor with a feed port and mix evenly. Let it stand and swell for 2 hours to obtain a mixture.

[0034] 2) Start the heating device of the reactor (the reactor is equipped with a pressure reducing valve to ensure that the reaction is carried out at atmospheric pressure), and pyrolyze the swollen mixture at 250°C and a stirring rate of 300 r / min for 40 minutes to obtain pyrolyzed liquefaction product A;

[0035] 3) Add 16.65 parts by weight of rubber powder (30 mesh) to pyrolysis liquefaction A through the feed port, and react at 250°C with a stirring speed of 300 r / min for 40 minutes; then add another 16.65 parts by weight of rubber powder, and continue to react at 250°C with a stirring speed of 300 r / min for 40 minutes to obtain pyrolysis liquefaction B (where the mass ratio of rubber powder to biological matrix in pyrolysis liquefaction B is 7:3), cool, and set aside for later use;

[0036] 4) Take 10 parts by weight of pyrolysis liquefaction B from step 3) and 90 parts by weight of 70# petroleum asphalt and stir them evenly in a reactor at 190°C. Then add 2 parts by weight of linear SBS copolymer and mix evenly. Then transfer it to a reaction vessel equipped with a high-speed shearing device and mix evenly. The shearing temperature of the high-speed shearing device is 180°C, the shearing rate is 4000 rpm, and the shearing time is 45 minutes. After shearing, the product is transferred to a development tank for swelling and development for 1 hour to obtain asphalt blend.

[0037] 5) Add 0.2 parts by weight of sulfur and 2 parts by weight of montmorillonite to the asphalt blend in sequence, mix evenly, and continue to develop for 1 hour to obtain near-zero pollution chain-linked liquefied rubber powder-based bio-asphalt.

[0038] Example 2

[0039] The near-zero pollution chain-linked pyrolysis liquefaction rubber powder-based bio-asphalt preparation method provided by the present invention includes the following steps:

[0040] 1) Add 60 parts by weight of waste oil-based bio-asphalt, 40 parts by weight of waste tire rubber powder (80 mesh) and 6 parts by weight of montmorillonite to a room temperature sealed reactor with a feed port and mix evenly. Let stand and swell for 6 hours to obtain a mixture.

[0041] 2) Start the heating device of the reactor (the reactor is equipped with a pressure reducing valve to ensure that the reaction is carried out at atmospheric pressure), and pyrolyze the swollen mixture at 270°C and a stirring rate of 300 r / min for 40 minutes to obtain pyrolyzed liquefaction product A;

[0042] 3) Add 50 parts by weight of rubber powder (80 mesh) to pyrolysis liquefaction A through the feed port, and react at 270°C with a stirring speed of 300 r / min for 40 minutes; then add another 50 parts by weight of rubber powder, and continue to react at 270°C with a stirring speed of 300 r / min for 40 minutes to obtain pyrolysis liquefaction B (where the mass ratio of rubber powder to biological matrix in pyrolysis liquefaction B is 7:3), cool, and set aside for later use;

[0043] 4) Take 30 parts by weight of pyrolysis liquefaction B from step 3) and 70 parts by weight of 70# petroleum asphalt and stir them evenly in a reactor at 190°C. Then add 4 parts by weight of linear SBS copolymer and mix evenly. Then transfer it to a reaction vessel equipped with a high-speed shearing device and mix evenly. The shearing temperature of the high-speed shearing device is 180°C, the shearing rate is 6000 rpm, and the shearing time is 45 minutes. After shearing, the product is transferred to a development tank for swelling and development for 3 hours to obtain asphalt blend.

[0044] 5) Add 0.6 parts by weight of sulfur and 4 parts by weight of montmorillonite to the asphalt blend in sequence, mix evenly, and continue to develop for 3 hours to obtain near-zero pollution chain-linked liquefied rubber powder-based bio-asphalt.

[0045] Example 3

[0046] The near-zero pollution chain-linked pyrolysis liquefaction rubber powder-based bio-asphalt preparation method provided by the present invention includes the following steps:

[0047] 1) Add 50 parts by weight of waste oil-based bio-asphalt, 50 parts by weight of waste tire rubber powder (60 mesh) and 5 parts by weight of montmorillonite to a room temperature sealed reactor with a feed port in sequence, mix evenly, and let stand to swell for 5 hours to obtain a mixture;

[0048] 2) Start the heating device of the reactor (the reactor is equipped with a pressure reducing valve to ensure that the reaction is carried out at atmospheric pressure), and pyrolyze the swollen mixture at 260°C and a stirring rate of 200 r / min for 30 minutes to obtain pyrolyzed liquefaction product A;

[0049] 3) Add 33.35 parts by weight of rubber powder (60 mesh) to pyrolysis liquefaction A through the feed port, and react at 260°C with a stirring speed of 200 r / min for 30 minutes; then add another 33.35 parts by weight of rubber powder, and continue to react at 260°C with a stirring speed of 200 r / min for 30 minutes to obtain pyrolysis liquefaction B (where the mass ratio of rubber powder to biological matrix in pyrolysis liquefaction B is 7:3), cool, and set aside for later use.

[0050] 4) Take 20 parts by weight of pyrolysis liquefaction B from step 3) and 80 parts by weight of 70# petroleum asphalt and stir them evenly in a reactor at 200°C. Then add 3 parts by weight of linear SBS copolymer and mix evenly. Then transfer it to a reaction vessel equipped with a high-speed shearing device and mix evenly. The shearing temperature of the high-speed shearing device is 180°C, the shearing rate is 5000 r / pm, and the shearing time is 40 minutes. After shearing, the product is transferred to a development tank for swelling and development for 2 hours to obtain asphalt blend.

[0051] 5) Add 0.4 parts by weight of sulfur and 3 parts by weight of montmorillonite to the asphalt blend in sequence, mix evenly, and continue to develop for 2 hours to obtain near-zero pollution chain-linked liquefied rubber powder-based bio-asphalt.

[0052] The present invention tested the performance of the near-zero pollution chain-pyrolysis liquefaction rubber powder-based bioasphalt prepared by the preparation methods provided in Examples 1-3, and the results are shown in Table 1:

[0053] Table 1 Performance test results of rubber powder-based bio-asphalt in Examples 1-3

[0054]

[0055] Comparative Example 1

[0056] The near-zero pollution chain pyrolysis liquefaction rubber powder-based bioasphalt preparation method provided in this comparative example has the same components as in Example 2, and its process steps are basically the same as in Example 2, except that it does not contain step 3); specifically: 1) 60 parts by weight of waste oil-based bioasphalt, 140 parts by weight of rubber powder (80 mesh) and 6 parts by weight of montmorillonite are added sequentially to a room temperature sealed reactor with a feed port and mixed evenly, and allowed to stand and swell for 6 hours to obtain a mixture;

[0057] 2) Start the heating device of the reactor (the reactor is equipped with a pressure reducing valve to ensure that the reaction is carried out at atmospheric pressure), and pyrolyze the swollen mixture at 270°C and a stirring rate of 300 r / min for 40 minutes to obtain the pyrolyzed liquefied product;

[0058] 3) Take 30 parts by weight of the pyrolysis liquefaction product from step 2) and 70 parts by weight of 70# petroleum asphalt and stir them evenly in a reactor at 190°C. Then add 4 parts by weight of linear SBS copolymer and mix evenly. Then transfer the mixture to a reaction vessel equipped with a high-speed shearing device and mix evenly. The shearing temperature of the high-speed shearing device is 180°C, the shearing rate is 6000 rpm, and the shearing time is 45 minutes. After shearing, the product is transferred to a development tank for swelling and development for 3 hours to obtain asphalt blend.

[0059] 4) Add 0.6 parts by weight of sulfur and 4 parts by weight of montmorillonite to the asphalt blend in sequence, mix evenly, and continue to develop for 3 hours to obtain the near-zero pollution chain pyrolysis liquefaction rubber powder-based bio-asphalt in this comparative example.

[0060] Comparative Example 2

[0061] The near-zero pollution chain-linked liquefied rubber powder-based bioasphalt preparation method provided in this comparative example has the same components and process steps as in Example 2, except that step 3 is omitted and montmorillonite adsorbent is not added. The specific steps are as follows:

[0062] 1) Add 60 parts by weight of waste oil-based bio-asphalt and 140 parts by weight of rubber powder (80 mesh) to a room temperature sealed reactor with a feed port, mix evenly, and let stand to swell for 6 hours to obtain a mixture;

[0063] 2) Start the heating device of the reactor (the reactor is equipped with a pressure reducing valve to ensure that the reaction is carried out at atmospheric pressure), and pyrolyze the swollen mixture at 270°C and a stirring rate of 300 r / min for 40 minutes to obtain the pyrolyzed liquefied product;

[0064] 3) Take 30 parts by weight of the pyrolysis liquefaction product from step 2) and 70 parts by weight of 70# petroleum asphalt and stir them evenly in a reactor at 190°C. Then add 4 parts by weight of linear SBS copolymer and mix evenly. Then transfer the mixture to a reaction vessel equipped with a high-speed shearing device and mix evenly. The shearing temperature of the high-speed shearing device is 180°C, the shearing rate is 6000 rpm, and the shearing time is 45 minutes. After shearing, the product is transferred to a development tank for swelling and development for 3 hours to obtain asphalt blend.

[0065] 4) After adding 0.6 parts by weight of sulfur to the asphalt blend and mixing evenly, continue to develop for 3 hours to obtain the near-zero pollution chain-linked liquefied rubber powder-based bio-asphalt in this comparative example.

[0066] The present invention performs performance tests on the near-zero pollution chain-pyrolysis liquefaction rubber powder-based bio-asphalt prepared by the preparation methods provided in Comparative Examples 1 and 2. The results are shown in Table 2.

[0067] Table 2 Performance test results of rubber-based bio-asphalt in Comparative Examples 1 and 2

[0068]

[0069] As can be seen from the data in Tables 1 and 2, the near-zero pollution chain-linked liquefied rubber powder-based bio-asphalt obtained by the preparation method of this application has excellent high and low temperature performance, thermal storage stability, workability and good environmental performance.

[0070] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A method for preparing near-zero pollution chain-linked pyrolysis liquefaction rubber powder-based bio-asphalt, characterized in that, Includes the following steps: 1) Place waste oil-based bio-asphalt, rubber powder and montmorillonite in a sealed reactor at room temperature and mix evenly. Let stand and swell for 2-6 hours to obtain a mixture. 2) The swollen mixture is then pyrolyzed to obtain pyrolyzed liquefaction product A; 3) Add the pyrolysis liquefaction powder to the pyrolysis liquefaction product A in portions. After each addition of the liquefaction powder, mix it evenly and react for 10-40 minutes to obtain the pyrolysis liquefaction product B. 4) Mix the pyrolysis liquefaction B with petroleum asphalt evenly, then add linear SBS copolymer and mix evenly. At the same time, use a high-speed shearing device to shear. After shearing, swelling and development will take 1-3 hours to obtain asphalt blend. 5) After adding sulfur and montmorillonite to the asphalt blend and mixing them evenly, continue to develop for 1-3 hours to obtain near-zero pollution chain-linked liquefied rubber powder-based bio-asphalt. The rubber powder is waste tire rubber powder with a mesh size of 30-80; the bio-asphalt is waste oil-based bio-asphalt; and the petroleum asphalt is 70# petroleum asphalt.

2. The method for preparing near-zero pollution chain-linked pyrolysis liquefaction rubber powder-based bioasphalt according to claim 1, characterized in that, The mass ratio of bio-asphalt, rubber powder and montmorillonite in step 1) is (40-60):(40-60):(3-6).

3. The method for preparing near-zero pollution chain-linked pyrolysis liquefaction rubber powder-based bio-asphalt according to claim 1, characterized in that, The pyrolysis and liquefaction conditions described in step 2) are as follows: the swollen mixture is pyrolyzed and liquefied at a stirring speed of 150-300 r / min and a temperature of 250-270℃ for 10-40 minutes.

4. The method for preparing near-zero pollution chain-linked pyrolysis liquefaction rubber powder-based bio-asphalt according to claim 1, characterized in that, After adding the adhesive powder in step 3), the mass ratio of the biological matrix to the adhesive powder in the system is (2-5):(4-10).

5. The method for preparing near-zero pollution chain-linked pyrolysis liquefaction rubber powder-based bio-asphalt according to claim 4, characterized in that, In step 4), the mass ratio of the pyrolysis liquefaction B, petroleum asphalt and linear SBS copolymer is (10-30):(70-90):(2-4).

6. The method for preparing near-zero pollution chain-linked pyrolysis liquefaction rubber powder-based bio-asphalt according to claim 1, characterized in that, In step 4), the shearing conditions of the high-speed shearing equipment are: shearing temperature of 150-200℃, shearing rate of 4000-6000rpm, and shearing time of 30-45 minutes.

7. The method for preparing near-zero pollution chain-linked pyrolysis liquefaction rubber powder-based bio-asphalt according to claim 4, characterized in that, The mass ratio of the asphalt blend, sulfur and montmorillonite mentioned in step 5) is 100:(0.2-0.6):(2-4).

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