Anti-segregation asphalt and method of making

Abstract

The application provides an anti-segregation asphalt and a preparation method thereof. The anti-segregation asphalt comprises the following components in parts by weight: 100 parts of asphalt, 0-3 parts of SBS, 2-3 parts of organic bentonite modified SBS, 1-6 parts of a compatilizer and 0.15-0.25 parts of a stabilizer. The organic bentonite is covalently connected to the SBS through grafting reaction, so that the organic bentonite and the SBS are not separated during the high-speed shearing process for preparing the SBS modified asphalt, the dispersibility of the SBS in the asphalt is improved, the density difference between the SBS and the asphalt is reduced, and the segregation of the SBS modified asphalt is effectively improved. The method has high universality, and the effects of the method on asphalt and SBS with different structures and properties are good. The method is particularly suitable for asphalt with too high addition amount of residual oil and difficult-to-satisfy segregation requirements of relevant standards.

Description

Technical Field

[0001] This invention relates to the field of road asphalt technology, and in particular to an anti-segregation asphalt and its preparation method. Background Technology

[0002] Asphalt is widely used in road construction due to its excellent viscoelastic properties and good bonding performance with aggregates. However, asphalt has poor rheological properties and is highly temperature sensitive. Road surfaces constructed directly with asphalt are prone to softening at high temperatures, resulting in rutting, and are prone to embrittlement and cracking at low temperatures. In addition, asphalt pavements are susceptible to UV and thermo-oxidative aging during long-term use. To address these shortcomings, many methods for modifying asphalt have been proposed. These include using rubber, thermoplastic elastomers, plastics, and inorganic minerals to modify asphalt. Among these modification methods, SBS (Special Benzoate) shows significant advantages due to its excellent overall modification effect.

[0003] Currently, there are two main types of production methods for SBS-modified asphalt both domestically and internationally: on-site mixing and factory production. On-site mixing involves mixing SBS and asphalt at the construction site, producing and using simultaneously. This method is prone to issues where production cannot keep up with usage, thus affecting construction efficiency. Factory production involves pre-producing SBS and asphalt in a factory and then transporting it to the construction site. This method involves storage and transportation. Therefore, it is essential that SBS remains stably and uniformly dispersed in the asphalt during storage and transportation, without phase separation.

[0004] However, due to significant differences between SBS and asphalt in molecular weight, polarity, and density, SBS is difficult to disperse in asphalt. Even if it is uniformly dispersed in the short term, poor compatibility can easily lead to phase separation during storage and transportation. Once phase separation occurs, the quality of SBS-modified asphalt is difficult to guarantee. Therefore, solving the dispersion stability of SBS in asphalt and improving the segregation of SBS-modified asphalt is of great significance. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this invention proposes an anti-segregation asphalt and its preparation method, which also has advantages such as stable high-temperature storage performance.

[0006] In a first aspect, the present invention provides an anti-segregation asphalt, the asphalt comprising: 100 parts by weight of asphalt, 0-3 parts of SBS, 2-3 parts of modified SBS, 1-6 parts of compatibilizer, and 0.15-0.25 parts of stabilizer.

[0007] As a specific embodiment of the present invention, if modified SBS is used entirely to prepare the anti-segregation asphalt of the present invention, its segregation will definitely be qualified. However, modified SBS has undergone a modification step, and its cost is higher than that of ordinary SBS. Therefore, considering the cost, 0-3 parts of SBS and 2-3 parts of modified SBS are used in combination.

[0008] As a specific embodiment of the present invention, the asphalt includes one or more of 70# asphalt, 90# asphalt, and 200# asphalt;

[0009] The SBS is a styrene-butadiene-styrene block copolymer, including linear, star-shaped, and star-line hybrid types;

[0010] The modified SBS is organobentonite modified SBS;

[0011] The compatibilizer is an aromatic oil;

[0012] The stabilizer includes crosslinking agents, co-crosslinking agents, and inorganic carriers. The main mechanism of action of the stabilizer is to crosslink SBS; commercially available stabilizers all have the function of crosslinking SBS.

[0013] Preferably, the asphalt is 70#, 90#, or 200# asphalt; the SBS is linear, star-shaped, or a combination of star and linear; the compatibilizer is an aromatic oil, such as reduced-three or reduced-four linear oil, the compatibilizer's role is to improve the compatibility between asphalt and SBS; the stabilizer is a commercially available general-purpose stabilizer suitable for the preparation of SBS modified asphalt, such as, but not limited to: Shandong Dashan Road and Bridge Engineering Co., Ltd., DS-SMS-03 modified asphalt stabilizer; China Petroleum & Chemical Research Institute, RSS-6 modified asphalt stabilizer; Sichuan Kelutai Transportation Technology Co., Ltd., KLT-WD modified asphalt stabilizer; these stabilizers all have the function of crosslinking SBS during the preparation of SBS modified asphalt.

[0014] As a specific embodiment of the present invention, the preparation method of the organobentonite modified SBS includes: shearing SBS at 175-185°C until the torque curve is stable, adding organobentonite, triallyl isocyanurate and dicumyl peroxide, shearing until the torque curve is stable, and discharging and cooling to obtain organobentonite modified SBS.

[0015] As a specific embodiment of the present invention, the preparation method includes, but is not limited to, adding SBS to a Hacker mixer and shearing it at 175-185°C and 50-120 r / min until the torque curve is stable. Then, adding organobentonite and shearing it until the torque curve is stable, followed by adding triallyl isocyanurate and dicumyl peroxide and shearing it until the torque curve is stable. After cooling the discharged material, it is fed into a rubber extruder and extruded and granulated into cylindrical shapes with a diameter of 2-3 mm and a length of 3-5 mm to obtain organobentonite modified SBS.

[0016] As a specific embodiment of the present invention, the weight ratio of SBS, organic bentonite, dicumyl peroxide and triallyl isocyanurate in the organic bentonite-modified SBS is 100:15-25:0.03-0.09:0.03-0.05.

[0017] As a specific embodiment of the present invention, the average interlayer spacing of the organic bentonite is not less than 0.8 nm. The organic bentonite is a commercially available product that has been modified with organic quaternary ammonium salts and other modifiers to increase the interlayer spacing.

[0018] As a specific embodiment of the present invention, the purpose of adding organic bentonite during the preparation of SBS modified with organic bentonite is as follows: 1. Under the combined action of the crosslinking agent dicumyl peroxide and the crosslinking accelerator triallyl isocyanurate, certain active groups in organic bentonite will crosslink with SBS, thereby grafting onto SBS. After SBS is grafted with organic bentonite, the density difference between it and asphalt is further reduced, which can effectively improve the sedimentation phenomenon caused by the large density difference between SBS and asphalt; 2. Organic bentonite has thixotropic properties. This property is widely used as an anti-settling agent and thickener in products such as coatings. After SBS is grafted with organic bentonite, the viscosity of the system will not increase significantly during the stirring process of preparing SBS modified asphalt, thus not significantly affecting the dispersion efficiency of SBS in asphalt. Once the SBS-modified asphalt is prepared, the viscosity of the system will increase during storage and transportation due to the presence of organobentonite, thereby effectively improving the separation of SBS from asphalt during storage and transportation, and significantly improving the segregation and high-temperature storage stability of SBS-modified asphalt; 3. Organobentonite has a layered structure, and after being added, it is uniformly dispersed in the asphalt, hindering the thermal motion of the asphalt molecular chains and improving the temperature sensitivity of the asphalt; 4. Organobentonite has a layered structure, and after being added, it is uniformly dispersed in the asphalt, effectively reducing the oxygen permeation efficiency in the asphalt, increasing the oxidation resistance of the asphalt, and improving the durability of the asphalt.

[0019] In a specific embodiment of the present invention, preferably, the organobentonite is organobentonite modified with modifiers such as organic quaternary ammonium salts. It is believed that modifier-modified organobentonite has an increased interlayer spacing. For example, the average interlayer spacing of modifier-modified organobentonite is not less than 0.8 nm. If the interlayer spacing of organobentonite is too small, SBS and asphalt cannot enter the interlayer space of organobentonite through intercalation, thus preventing the organobentonite from forming a good exfoliation structure in the SBS-modified asphalt system and affecting the beneficial effects of adding organobentonite mentioned above. Increasing the interlayer spacing of organobentonite makes it easier for SBS to enter the interlayer space of organobentonite through intercalation, and also makes it easier for subsequent asphalt components to enter the interlayer space of organobentonite, thereby increasing the stability of SBS-modified asphalt. However, generally speaking, organobentonite with a larger interlayer spacing has a higher market price. Therefore, both economic and technical considerations must be taken into account when selecting organobentonite.

[0020] In a specific embodiment of the present invention, preferably, during the preparation of organobentonite-modified SBS, the weight ratio of SBS to organobentonite is 100:15-25. Insufficient organobentonite will not fully exert the beneficial effects mentioned above. Excessive organobentonite will cause the SBS to be tightly encapsulated. When SBS tightly encapsulated in organobentonite is used in the subsequent preparation of SBS-modified asphalt, it cannot quickly and sufficiently attract the light components and compatibilizer components in the asphalt, thus preventing the SBS from swelling quickly and sufficiently. This affects the subsequent shear dispersion and effective development of SBS in the asphalt, ultimately affecting the ductility and segregation properties of the SBS-modified asphalt. Excessive organobentonite can also easily lead to agglomeration in the system, affecting the performance of the SBS-modified asphalt.

[0021] As a specific embodiment of the present invention, the purpose of adding dicumyl peroxide and triallyl isocyanurate is as follows: Dicumyl peroxide is a peroxide-based crosslinking agent. Under high temperature, it generates active free radicals, thereby causing SBS and organobentonite to undergo covalent crosslinking, making the organobentonite tightly bound to the SBS. This tightly bound structure is not easily destroyed during the high-speed shear stage in the subsequent preparation of SBS-modified asphalt. This maximizes the beneficial effects of the aforementioned addition of organobentonite. Triallyl isocyanurate is a crosslinking accelerator, which can improve the crosslinking efficiency of dicumyl peroxide.

[0022] In a preferred embodiment of the present invention, during the preparation of organobentonite-modified SBS, the weight ratio of SBS, organobentonite, dicumyl peroxide, and triallyl isocyanurate is 100:15-25:0.03-0.09:0.03-0.05. If the amount of dicumyl peroxide and triallyl isocyanurate added is too small, effective covalent cross-linking between organobentonite and SBS cannot be achieved. If the amount of dicumyl peroxide and triallyl isocyanurate added is too large, it will cause SBS to prematurely form a three-dimensional network cross-link. When this type of SBS with prematurely formed three-dimensional network cross-links is used in the subsequent preparation of SBS-modified asphalt, it cannot be effectively dispersed during the high-speed shear stage, thus severely affecting the overall performance of the SBS-modified asphalt.

[0023] In a specific embodiment of the present invention, during the preparation of organo-bentonite modified SBS, dicumyl peroxide and triallyl isocyanurate may simultaneously graft bentonite onto SBS and potentially cause SBS to crosslink. Once SBS self-crosslinks and forms a three-dimensional network structure, it becomes difficult to disperse uniformly in the asphalt during subsequent SBS-modified asphalt preparation, severely affecting the performance of the asphalt. Therefore, the key technical point of the present invention lies in controlling the amount of dicumyl peroxide and triallyl isocyanurate. The control point is to enable effective grafting of organo-bentonite onto SBS without causing SBS to form a three-dimensional network structure.

[0024] In a specific embodiment of the present invention, during the preparation of organo-bentonite modified SBS, to verify whether a three-dimensional network structure was formed in the SBS, the organo-bentonite modified SBS was wrapped in a 200-mesh copper mesh and added to toluene, then refluxed at 115°C for 4 hours. The copper mesh was then removed and observed for undissolved substances. If there were obvious residues on the copper mesh, these residues were cross-linked polymers that were difficult to dissolve in toluene. Studies have shown that when the weight ratio of dicumyl peroxide to SBS is greater than 0.09%, obvious residues will appear on the copper mesh. Based on this, it is determined that the amount of dicumyl peroxide should not exceed 0.09% of the SBS. Simultaneously, the reflux liquid was filtered while hot, and the filter cake was subjected to thermogravimetric analysis and compared with that of organo-bentonite. Studies have shown that when the amount of dicumyl peroxide is less than 0.03% of the SBS, the mass loss of the filter cake is consistent with that of organo-bentonite at room temperature to 560°C. When the amount of SBS exceeds 0.03% of the SBS, the mass loss of the filter cake at room temperature to 560°C is greater than that of organo-bentonite. This indicates that the amount of crosslinking agent dicumyl peroxide was too small to enable the grafting reaction between SBS and organobentonite.

[0025] Secondly, the present invention provides a method for preparing the anti-segregation asphalt, comprising the following steps:

[0026] S1: Heat the asphalt to a molten state, and while stirring, add the compatibilizer, SBS, and organo-bentonite modified SBS in sequence to obtain the first mixture;

[0027] S2: Add a stabilizer to the first mixture under emulsified shear conditions and stir to develop anti-segregation asphalt.

[0028] In a specific embodiment of the present invention, in step S1, the heating temperature is 170-185°C; the stirring speed is 1000-1500 r / min; and the stirring time is 30-60 min.

[0029] In a specific embodiment of the present invention, in step S2, the stabilizer is added in two parts: the first part is 50% to 75% of the total amount, and the second part is 25% to 50%.

[0030] The initial addition of the stabilizer was at a temperature of 170–175°C; the stirring speed was 4500–6000 r / min; the shearing time was 8–15 min; and / or

[0031] The second addition of stabilizer was done at a temperature of 175–185°C; the stirring speed was 500–800 r / min; and the shearing time was 8–15 min.

[0032] In a specific embodiment of the present invention, the stabilizer is added in two stages. The first addition of the stabilizer occurs during shearing at a shear rate of 4500–6000 r / min. At this rate, the stabilizer is uniformly dispersed in the asphalt system. Uniform dispersion ensures that the stabilizer exerts its optimal cross-linking effect. When the stabilizer is added to the first mixture, it begins to generate free radicals, causing SBS to cross-link. However, at this time, the system is still in a high-speed shearing process, during which the cross-linked SBS may be sheared off. Under low-speed conditions, the cross-linked SBS will not be sheared off. Therefore, a small portion (25–50%) of the stabilizer is added at low speed to ensure that the sheared SBS molecular chains can re-cross-link. The fundamental reason for asphalt formation is the separation of uncross-linked SBS from the asphalt during high-temperature storage. In other words, research shows that staged addition of the stabilizer ensures that more SBS cross-links. Therefore, the amount of stabilizer added in the first stage is 50%–75%, and in the second stage, it is 25%–50%.

[0033] As a specific embodiment of the present invention, before step S2, the process further includes emulsification and shearing for 30 to 50 minutes, with a shearing temperature of 170 to 175°C and a stirring speed of 4500 to 6000 r / min.

[0034] As a specific embodiment of the present invention, research shows that 175–185°C is the optimal crosslinking temperature. However, when the stabilizer is added for the first time, the system is in a high-speed shear state, which causes the system temperature to rise rapidly. To prevent the system from aging, the temperature is controlled at 170–175°C. When the stabilizer is added for the second time, the temperature is maintained at 175–185°C with low-speed stirring, and the temperature is also maintained at 175–185°C during the subsequent development period of 2.5–8 hours.

[0035] In a specific embodiment of the present invention, the development time in step S2 is 2.5 to 8 hours.

[0036] By selecting appropriate preparation conditions, the prepared SBS modified asphalt exhibits excellent anti-segregation properties, as well as good temperature sensitivity and resistance to heat and oxygen aging.

[0037] All of the above-mentioned raw materials used in this invention can be prepared in-house or purchased commercially; this invention does not impose any particular limitations on them.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0039] 1. This invention utilizes a rational technical means to covalently graft organobentonite onto the surface of SBS. Unlike directly adding organobentonite during the preparation of SBS-modified asphalt, the organobentonite-modified SBS prepared using this method does not separate from SBS during high-speed shearing. While leveraging the beneficial effects of organobentonite addition, it overcomes the problem of traditional direct addition of organobentonite, which results in organobentonite failing to bond tightly with SBS, thus failing to effectively reduce the density difference between SBS and asphalt, leading to severe segregation of the SBS-modified asphalt. It also overcomes the consequence of bentonite agglomeration that may result from direct addition of organobentonite, thereby affecting the performance of SBS-modified asphalt.

[0040] 2. This method for improving the segregation of SBS-modified asphalt is universally applicable. For star-shaped SBS with a high tendency to segregate, covalent grafting modification using this method significantly improves its dispersion stability in asphalt. It also shows significant effects on asphalts with different four-component contents. It is particularly suitable for asphalts with excessively high residual oil content, where segregation fails to meet relevant standards.

[0041] 3. The method for preparing anti-segregation asphalt of the present invention is simple and suitable for widespread application. Detailed Implementation

[0042] The present invention will be further described below with reference to specific embodiments, but this does not constitute any limitation on the present invention.

[0043] In the various embodiments of the present invention, the HAAKE internal mixer used is the HAAKE (polylab) type manufactured by HAAKE GmbH in Germany.

[0044] The specific information of each reagent in the various embodiments of the present invention is as follows:

[0045] Organic bentonite, color: white to pale yellow, pH: 9.0, interlayer spacing: 0.9 nm, Shanghai Wenyan Chemical Technology Co., Ltd.

[0046] Triallyl isocyanurate, analytical grade, Shanghai Aladdin Biochemical Technology Co., Ltd.

[0047] Dicumyl peroxide, analytical grade, Shanghai Aladdin Biochemical Technology Co., Ltd.

[0048] SBS, F503, Maoming Branch of China Petroleum & Chemical Corporation.

[0049] Asphalt, 70# or 90#, China Petroleum & Chemical Corporation Maoming Branch.

[0050] Compatibilizer, No. 4 oil, China Petroleum & Chemical Corporation Maoming Branch.

[0051] Stabilizer, RSS-6 type, Sinopec Research Institute of Petroleum Processing.

[0052] Example 1

[0053] This embodiment provides a method for modifying SBS with organic bentonite, the specific details of which are as follows:

[0054] SBS was added to a Hacker mixer and sheared at 180°C and 70 r / min until the torque curve stabilized. Then, organobentonite was added and sheared until the torque curve stabilized. Next, triallyl isocyanurate and dicumyl peroxide were added and sheared until the torque curve stabilized. After cooling, the material was fed into a rubber extruder and extruded into cylindrical pellets with a diameter of 2 mm and a length of 3 mm to obtain organobentonite modified SBS.

[0055] Examples 2-6

[0056] Examples 2-6 use the same preparation method as Example 1 to prepare organobentonite modified SBS, except that the raw material feeding ratio is different. Specific details are shown in Table 1.

[0057] Comparative Examples 1-3

[0058] Comparative Examples 1-3 were prepared using the same method as in Example 1 to prepare organobentonite-modified SBS, except for the different raw material feeding ratios, as detailed in Table 1.

[0059] Table 1 shows the different organobentonite-modified SBS (parts by weight) prepared by different raw material ratios in Examples 1-6 and Comparative Examples 1-3.

[0060]

[0061] Example 7

[0062] This embodiment provides an anti-segregation asphalt and its preparation method, with specific details as follows:

[0063] At 180℃, the asphalt was heated to a molten state, and stirred at 1000 rpm using a stirring rod. Compatibilizer, SBS, and the organo-bentonite modified SBS obtained in Example 1 were added sequentially, and stirring continued for 40 min. At 175℃, an emulsifying shearing machine was used for shearing for 40 min. At 175℃, 3 / 4 of the total stabilizer was added, and an emulsifying shearing machine was used for shearing for 10 min. At 180℃, 1 / 4 of the total stabilizer was added, and stirring was performed at 500 rpm using a stirring rod for a certain period of time to develop the asphalt. Anti-segregation asphalt was obtained.

[0064] Examples 8-18

[0065] Examples 8-18 use the same method for preparing anti-segregation bitumen as provided in Example 7, but with different component ratios and production conditions. Specific details are shown in Table 2.

[0066] Comparative Examples 4-6

[0067] Comparative Examples 4-6 used the same method for preparing anti-segregation bitumen as provided in Example 7, but with different component ratios and production conditions. Specific details are shown in Table 2.

[0068] Table 2. Production of anti-segregation asphalt (parts by weight) under different raw material ratios and process conditions in Examples 7-18

[0069]

[0070]

[0071] Comparative Example 7

[0072] This comparative example provides an anti-segregation bitumen and its preparation method, the details of which are as follows:

[0073] The feed ratio of asphalt, SBS, compatibilizer and stabilizer is 100:4:2:0.18 by weight.

[0074] Heat the asphalt to a molten state at 180℃, stir with a stirring rod at 1000r / min, add compatibilizer and SBS in sequence, and continue stirring for 40min;

[0075] At 175℃, an emulsifying shearing machine was used to shear at 4500 r / min for 40 min;

[0076] At 175℃, add 3 / 4 of the total amount of stabilizer and shear for 10 minutes using an emulsifying shear machine at 4500 r / min;

[0077] At 180℃, add 1 / 4 of the total amount of stabilizer and stir at 500 r / min for 3.5 h.

[0078] Comparative Example 8

[0079] This comparative example provides an anti-segregation bitumen and its preparation method, the details of which are as follows:

[0080] By weight, the feeding ratio of asphalt, SBS, organobentonite, compatibilizer and stabilizer is 100:4:0.8:2:0.18.

[0081] At 180℃, the asphalt is heated to a molten state, and stirred at 1000 r / min with a stirring rod. Compatibilizer, SBS and commercially available organic bentonite with an average interlayer spacing of 0.97 nm are added in sequence, and stirring is continued for 40 min.

[0082] At 175℃, an emulsifying shearing machine was used to shear at 4500 r / min for 40 min;

[0083] At 175℃, add 3 / 4 of the total amount of stabilizer and shear for 10 minutes using an emulsifying shear machine at 4500 r / min;

[0084] At 180℃, add 1 / 4 of the total amount of stabilizer and stir at 500 r / min for 3.5 h.

[0085] Segregation tests were performed on Examples 7-18 and Comparative Examples 7-8, and the test data are shown in Table 3.

[0086] Table 3 shows the segregation test results for Examples 7-18 and Comparative Examples 4-8.

[0087]

[0088] Of the six comparative examples, example 4 is the most preferred formulation.

[0089] Table 3 shows that Comparative Example 1, without the addition of organobentonite, achieved a segregation temperature of 22℃. Comparative Example 2, with the direct addition of organobentonite, showed some improvement in segregation temperature, but it remained at 14℃, failing to meet the JTG F40-2017 standard requirement of ≤2.5℃. Examples 7–18 all exhibited segregation temperatures less than 2.5℃, meeting the requirements of the JTG F40-2017 standard. Examples 12 and 14 yielded the best asphalt performance. This demonstrates that the method described in this patent can meet the segregation requirements of SBS modified asphalt within a wide range of formulation and process variations, exhibiting good tolerance and universality.

[0090] In summary, the anti-segregation asphalt of the present invention has excellent anti-segregation properties, as well as good temperature sensitivity and resistance to heat and oxygen aging.

[0091] Any numerical value mentioned in this invention, if there is only a two-unit interval between any minimum and any maximum value, includes all values ​​that increase by one unit each time from the minimum to the maximum value. For example, if the amount of a component, or the value of a process variable such as temperature, pressure, or time, is stated as 50-90, in this specification it means specifically listing values ​​such as 51-89, 52-88… and 69-71 and 70-71, etc. For non-integer values, it may be appropriately considered that a unit is 0.1, 0.01, 0.001, or 0.0001. These are merely some specifically specified examples. In this application, in a similar manner, all possible combinations of numerical values ​​between the listed minimum and maximum values ​​are considered to have been disclosed.

[0092] It should be noted that the embodiments described above are only for explaining the present invention and do not constitute any limitation on the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory terms, not limiting terms. Modifications can be made to the present invention within the scope of the claims, and revisions can be made to the present invention without departing from the scope and spirit of the present invention. Although the present invention described herein relates to specific methods, materials, and embodiments, it does not mean that the present invention is limited to the specific examples disclosed herein; on the contrary, the present invention can be extended to all other methods and applications with the same function.

Claims

1. An anti-segregation bitumen, characterized in that, The asphalt comprises, by weight, 100 parts asphalt, 0-3 parts SBS, 2-3 parts organobentonite modified SBS, 1-6 parts compatibilizer, and 0.15-0.25 parts stabilizer; The preparation method of the organobentonite modified SBS includes: shearing SBS at 175~185℃ until the torque curve is stable, adding organobentonite, triallyl isocyanurate and dicumyl peroxide, shearing until the torque curve is stable, and discharging and cooling to obtain organobentonite modified SBS.

2. The anti-segregation bitumen according to claim 1, characterized in that, The asphalt includes at least one of 70# asphalt, 90# asphalt, and 200# asphalt; And / or, the SBS has a molecular weight of 110,000 to 230,000, including one of linear, star-shaped, or star-line mixed SBS.

3. The anti-segregation bitumen according to claim 1, characterized in that, In the preparation method of SBS modified with organobentonite, the weight ratio of SBS, organobentonite, dicumyl peroxide and triallyl isocyanurate is 100:15~25:0.03~0.09:0.03~0.

05.

4. The anti-segregation bitumen according to any one of claims 1-3, characterized in that, The average interlayer spacing of the organic bentonite is not less than 0.8 nm.

5. A method for preparing anti-segregation bitumen according to any one of claims 1-4, characterized in that, Includes the following steps: S1: Heat the asphalt to a molten state, and under stirring conditions, add compatibilizer, optional SBS, and organo-bentonite modified SBS in sequence to obtain mixture 1; S2: Add stabilizer to mixture 1 under emulsified shear conditions and stir to develop anti-segregation asphalt.

6. The preparation method according to claim 5, characterized in that, In step S1, the heating temperature is 170~185℃; and / or the stirring speed is 1000~1500r / min; the stirring time is 30~60min.

7. The preparation method according to claim 5 or 6, characterized in that, In step S2, the stabilizer is added in two stages: the first stage is 50% to 75% of the total amount, and the second stage is 25% to 50%. The initial addition of the stabilizer was at a temperature of 170-175°C; the shear rate was 4500-6000 r / min; the shearing time was 8-15 min; and / or, The second addition of stabilizer is at a temperature of 175~185℃; the stirring speed is 500~800r / min; and the stirring time is 8~15min.

8. The preparation method according to claim 5 or 6, characterized in that, Step S2 further includes emulsifying and shearing for 30-50 minutes before adding the stabilizer, with a shearing temperature of 170-175°C and a stirring speed of 4500-6000 r / min.

9. The preparation method according to claim 5 or 6, characterized in that, In step S2, the stirring and development time is 2.5~8 hours.

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