High-temperature-resistant SBS modified asphalt and preparation method thereof

Abstract

The invention belongs to the field of new materials, particularly relates to a new material for road construction, and more particularly relates to high-temperature-resistant SBS modified asphalt and a preparation method thereof.The high-temperature-resistant SBS modified asphalt mainly comprises matrix asphalt, an SBS asphalt modifier, a rubber oil ductility enhancer, a stabilizer and the like. The main improvement is that the 325-600-mesh stone powder is added into the modified asphalt, so that the use amount of the SBS asphalt modifier is reduced, the softening point of the modified asphalt is increased, the needle penetration is reduced, and the preparation cost of the modified asphalt is reduced.

Description

Technical Field

[0001] The invention belongs to the field of new materials, specifically relates to new materials for road construction, and more specifically relates to a high-temperature resistant SBS modified asphalt and a preparation method thereof. Background Art

[0002] The large amount of stone powder dust generated in the fields of transportation and construction can be recycled and utilized, and the product application performance advantages can be improved. Limestone can be divided into three types: biological deposition, chemical deposition and secondary deposition. The mineral components of limestone are mainly calcite, accompanied by dolomite, magnesite and other carbonate minerals. Magnesium is in the form of white limestone and magnesite, silicon oxide is free quartz, free oxides (magnetite, hematite) and hydroxides (hydrous goethite) exist; there is also glauconite, and some types of limestone also contain organic matter such as coal and asphalt, sulfates such as gypsum and anhydrite, as well as compounds of phosphorus and calcium. Limestone has good processability, polishability and good cementation properties. It is insoluble in water, easily soluble in saturated sulfuric acid, and can react with various strong acids to form corresponding calcium salts, while releasing CO2. Limestone can withstand high temperatures above 900°C.

[0003] Asphalt is a dark brown complex mixture of hydrocarbons and their non-metallic derivatives of different molecular weights, with high viscosity organic matter. SBS belongs to the styrene thermoplastic elastomer, which is a styrene-butadiene-styrene triblock copolymer. The polystyrene segment and polybutadiene segment in SBS clearly present a two-phase structure, with polybutadiene as the continuous phase and polystyrene as the dispersed phase. From the application of SBS modified asphalt to the present, SBS modified asphalt has significantly improved the high temperature, low temperature, fatigue, aging resistance, rutting on the road surface, cracking and other properties of asphalt, and the comprehensive performance has been significantly improved in the application field. The existing SBS modified asphalt has greatly improved the base asphalt in terms of rutting resistance, temperature stability, durability, and anti-skid performance of the road surface. The greater the amount of SBS modifier used, the better the rutting resistance and temperature stability, but the greater the cost. When the traditional modified asphalt fails to mix evenly with the coarse aggregate and mineral powder during the mixing process during the construction application stage, the structural stability of the asphalt concrete cannot be achieved, and permanent deformation occurs under the action of mechanical load. The optimization and upgrading of industrial structure requires continuous exploration, optimization and upgrading of SBS modified asphalt, and continuous improvement of the superior performance of SBS modified asphalt products. Summary of the invention

[0004] In order to solve the problems of low asphalt softening point, large needle penetration and high cost caused by large amount of SBS in the prior art, the present invention provides a high temperature resistant SBS modified asphalt and a preparation method thereof. The raw materials of the high temperature resistant SBS modified asphalt mainly include base asphalt, SBS asphalt modifier, rubber oil extender, stabilizer, etc. Compared with the traditional asphalt formula, the main improvement is that 325-600 mesh stone powder is added to the modified asphalt, the amount of SBS asphalt modifier is reduced, and the preparation cost of the modified asphalt is reduced while the softening point of the modified asphalt is increased and the needle penetration is reduced.

[0005] The high temperature resistant SBS modified asphalt provided by the present invention comprises the following raw materials by weight: 88-95 parts of base asphalt, 2.0-4.5 parts of SBS asphalt modifier, 1.0-3.5 parts of rubber oil extender, 0.16-0.37 parts of stabilizer, 3.0-5.0 parts of stone powder, 0.10-0.35 parts of polyvinyl alcohol amide sodium, and 0.05-0.10 parts of hydroxymethyl cellulose; wherein the fineness of the stone powder is 325-600 meshes.

[0006] Modified asphalt goes through the process of swelling → shearing → development. Swelling is closely related to compatibility and directly affects the performance of modified asphalt. The degree of swelling of SBS in asphalt directly affects the compatibility and final performance of modified asphalt. The swelling rate accelerates with the increase of temperature. Shearing is a key step in the production process of SBS modified road asphalt, which directly affects the uniformity and stability of the final product. During the shearing process, the SBS modifier is continuously dispersed by strong shearing and collision, and the particles are ground to form a miscible and stable system with asphalt to achieve the purpose of uniform blending. This process is usually carried out under high temperature and high speed operation, using colloid mill equipment. After shearing, the asphalt enters the development stage, usually at a temperature of 180-200℃, and the development process is carried out for a certain period of time under the action of the agitator. The fineness of stone powder can have a good shearing effect within a reasonable range. The fineness of stone powder is large, the specific surface area is large, and the fine particles are firmly locked with the SBS asphalt modifier. The stone powder modifier plays a role of uniform dispersion in the asphalt. If it exceeds a reasonable range, the asphalt and the modifier cannot wrap the stone powder, the connection performance between the stone powder particles and the asphalt is poor, the interaction force between the molecules becomes fragile, and it is easy to separate and disperse under high temperature conditions, and the high temperature resistance performance of the modified asphalt cannot be achieved.

[0007] Preferably, the high temperature resistant SBS modified asphalt comprises the following raw materials: 90 parts of base asphalt, 3.5 parts of SBS asphalt modifier, 2.7 parts of rubber oil extender, 0.25 parts of stabilizer, 3.5 parts of stone powder, 0.10-0.35 parts of polyvinyl alcohol amide sodium, and 0.05-0.10 parts of hydroxymethyl cellulose.

[0008] More preferably, the amount of the polyvinyl alcohol amide sodium is 0.15 parts and the amount of hydroxymethyl cellulose is 0.05 parts.

[0009] Preferably, the stone powder is limestone powder. The free calcium element contained in the limestone powder is alkaline and can neutralize the acidic substances in the asphalt, adjust the pH value of the stone powder modified asphalt, and make the connection between the molecules of the modified asphalt closer. The alkaline substances in the limestone powder can also inhibit the aging process of the modified asphalt and significantly improve the thermal stability of the modified asphalt, which is more advantageous than other stone powders.

[0010] More preferably, the limestone powder is 400 mesh; the limestone powder is formed by processing limestone, and the limestone is a by-product of limestone ore mining.

[0011] Preferably, the base asphalt is No. 70 base asphalt; and the SBS asphalt modifier is a linear SBS asphalt modifier.

[0012] The advantages of linear SBS modifiers include lower glass transition temperature and better fluidity. They have better dispersibility, fluidity and oil absorption performance during swelling and shearing. Compared with nonlinear SBS modifiers, linear SBS modifiers have better compatibility with base asphalt and limestone, and are not easy to produce gel state in the production of modified asphalt. The high temperature resistance of asphalt can be improved through the modification of modifiers.

[0013] More preferably, the base asphalt is one of Jingbo No. 70 A-grade road petroleum asphalt, Tapco No. 70 A-grade road petroleum asphalt, and Shell No. 70 A-grade road petroleum asphalt.

[0014] The rubber oil extending agent is preferably produced by Dongying Mantec Petrochemical Co., Ltd., and the stabilizer is XT series modified asphalt stabilizer.

[0015] The present invention also provides a method for preparing the high temperature resistant SBS modified asphalt, comprising the following steps: 1) Heat the base asphalt in an oven at 135°C until it flows, add SBS asphalt modifier, and stir for 15-20 minutes to allow the base asphalt to wrap the SBS asphalt modifier, so that the base asphalt and the SBS asphalt modifier form a mixture in an oil-in-water state; 2) placing the mixture obtained by stirring the base asphalt and the SBS asphalt modifier in step 1) in a shearing machine, heating the shearing machine to 180-200° C., so that the mixture of the base asphalt and the SBS asphalt modifier is heated to 180-200° C., and obtaining a base material; The above two steps are conventional methods for preparing SBS modified asphalt, and the inventors will not elaborate on them; 3) Shearing the base material obtained in step 2) at 180-200° C. for 40-50 minutes, and then putting the stone powder into the shearing machine and continuing shearing for 20-30 minutes to obtain a semi-finished modified asphalt; First, the SBS asphalt modifier is sheared, so that the SBS asphalt modifier can fully swell and dissolve in the base asphalt, which makes it easier to form a denser connection structure for the subsequent addition of limestone powder modifier; the interaction force structure between limestone powder, SBS asphalt modifier and base asphalt is increased, and the stability of the overall modified asphalt is increased; 4) Add the rubber oil extender, stabilizer, sodium polyvinyl alcohol amide and hydroxymethyl cellulose to the semi-finished modified asphalt obtained after shearing in step 3) in order, stir and develop at 180-200° C. for 5-8 hours to obtain high temperature resistant SBS modified asphalt.

[0016] The high temperature resistant SBS modified asphalt of the present invention has achieved the following technical effects: In the traditional formula, the preparation of SBS modified asphalt with high softening point and high thermal stability requires increasing the amount of SBS asphalt modifier, resulting in increased production costs. The modified asphalt of the present invention reduces the amount of SBS modifier used relative to the traditional formula, adds relatively cheap limestone powder to replace a part, effectively reduces the material cost in the construction cost, and can also maintain other technical indicators of asphalt. The addition of limestone powder improves the thermal stability of the modified asphalt, can be better compatible with asphalt mixture, and reduces the construction difficulties caused by viscosity. After testing, after combining with asphalt mixture in road pavement construction, it significantly improves the high temperature stability of the asphalt material and the road surface rutting, cracking, looseness, potholes and other properties.

[0017] The fineness of limestone powder can have a good shearing effect within a reasonable range. The fineness of the stone powder is large, the specific surface area is large, and the fine particles are firmly locked with the SBS asphalt modifier. The stone powder modifier plays a role of uniform dispersion in the asphalt. When it exceeds the reasonable range, the asphalt and the modifier cannot wrap the stone powder, the connection performance between the stone powder particles and the asphalt is poor, the interaction force between the molecules becomes fragile, and it is easy to separate and disperse under high temperature conditions, and the high temperature resistance of the modified asphalt cannot be achieved. The addition of stone powder as a filler and modifier reduces the hazards of dust generated by mining and dust generated by cutting limestone decorations. The stone powder generated by ore crushing can be recycled and can be recycled for the second time in the overall environment. The limestone powder of the present invention mainly comes from the by-products produced when limestone is mined in the mine to prepare stone materials, as well as the limestone left by the excavation of mountain ore sand during road construction and the dust by-products when limestone is processed to produce machine-made sand, which realizes the secondary utilization of waste, saves energy, and protects the environment.

[0018] The modified asphalt of the present invention is combined with asphalt mixture to form mastic asphalt, which has certain flexibility and will not be torn when the structure is deformed. It has the composition characteristics of high content of coarse aggregate, high content of mineral powder, large asphalt dosage, and low content of intermediate particle size particles. The high content of coarse aggregate in the mixture directly bears the load by forming a skeleton with direct contact and mutual interlocking of the particles, and this skeleton is less sensitive to temperature. The high content of stone powder forms a gel-like substance with high cohesion with asphalt, which improves the overall mechanical properties of the mixture. The effects of these two aspects make the mixture have sufficient vertical and lateral constraints, and no or only slight permanent deformation occurs under the action of vehicle load. It can be seen that the modified asphalt of the present invention is more excellent in anti-rutting ability, temperature stability, and anti-skid performance of the road surface. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below in conjunction with specific embodiments. These embodiments are only used to illustrate the technical solution of the present invention in more detail and should not be construed as limiting the protection scope of the present invention.

[0020] The base asphalt used in the embodiment is Jingbo No. 70 A-grade road petroleum asphalt; the SBS asphalt modifier is Yueyang Petrochemical linear SBS modifier; other substances, unless otherwise specified, are directly purchased general commercial products. The modified asphalt standard detection method of the present invention uses two inspection methods of JIG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" T0604-2011 and T0606-2011. The rubber oil extender uses the G26 rubber oil extender produced by Dongying Mantec Petrochemical Co., Ltd., and the stabilizer uses the XT-3 modified asphalt stabilizer.

[0021] Based on the existing conventional technical treatment methods, limestone is processed into powder. The limestone powder is made of irregularly shaped limestone crushed in the by-product of limestone ore mining. After cleaning, the surface layer of soil and other impurities are removed to ensure the purity of the limestone powder. After cleaning, it is dried in an oven at 105°C for 1 hour to dry the wet limestone to remove the moisture in the limestone. The limestone is fed by a vibrating feeder. The first crushing is done with a jaw crusher (the jaw crusher should be equipped with a strip partition screen to filter soil and slender flat blocks). The 500mm stone is crushed to less than 130mm. The second crushing is done with a cone crusher to crush the 130mm stone to less than 40mm. The third crushing is done with an impact crusher, and the crushed stone is then vibrated and screened into the final product, namely 20~40mm, 10~20mm, 5~10mm, and 3~5mm.

[0022] The crushed limestone is further heated in a high-temperature furnace at 1000℃ for 2 hours to decompose it into carbon dioxide gas and calcium oxide. A small sample is taken out after decomposition and added to dilute hydrochloric acid without bubbles, indicating that the limestone is completely decomposed. Then the stone is ground and graded using Guilin Hongcheng HC series pendulum mill: the decomposed calcium oxide is ground through the grinder equipment to make it into fine particles. At the same time, the vibrating screen, drum screen and swing screen are used in sequence for continuous screening to separate limestone powder of different particle sizes. The ground stone powder is graded by the T-Sepax high-efficiency three-separation powder classifier. The stone powder that meets the fineness is sent into the new isolated cyclone powder collector with the air flow through the pipeline for separation and collection. The collected stone powder product is sent to the stone powder bin through the discharge port and the conveying device to obtain limestone powder of the required particle size.

[0023] The limestone powders used in the following examples and comparative examples have mesh sizes of 100 mesh, 325 mesh, 400 mesh and 600 mesh, respectively.

[0024] Example 1 A high temperature resistant SBS modified asphalt comprises the following raw materials, measured by mass: 90 parts of base asphalt, 3.5 parts of SBS asphalt modifier, 2.7 parts of rubber oil extender, 3.5 parts of 325 mesh limestone powder, 0.25 parts of stabilizer, 0.15 parts of polyvinyl alcohol amide sodium, and 0.05 parts of hydroxymethyl cellulose.

[0025] The specific preparation method is as follows: A1: Heat the base asphalt in an oven at 135°C until it flows, add SBS asphalt modifier, and stir for 20 minutes to allow the base asphalt to wrap the SBS asphalt modifier, so that the base asphalt and the SBS asphalt modifier form an oil-in-water state; A2: placing the mixture obtained by stirring the base asphalt and the SBS asphalt modifier in step A1 in a shearing machine, heating the shearing machine to 190° C., so that the mixture of the base asphalt and the SBS asphalt modifier is heated to 190° C., and obtaining a base material; A3: Shear the base material obtained in step A2 at 190° C. for 45 minutes, then put the stone powder into the shearing machine and continue shearing for 25 minutes to obtain a semi-finished modified asphalt; A4 adds rubber oil extender, stabilizer, polyvinyl alcohol amide sodium and hydroxymethyl cellulose to the semi-finished modified asphalt obtained after shearing in step A3 in order, and stirs and develops at 190° C. for 7 hours to obtain high temperature resistant SBS modified asphalt.

[0026] Example 2

[0027] A high temperature resistant SBS modified asphalt comprises the following raw materials, measured by mass: 92 parts of base asphalt, 2.8 parts of SBS asphalt modifier, 2.0 parts of rubber oil extender, 3.2 parts of 325 mesh limestone powder, 0.25 parts of stabilizer, 0.15 parts of polyvinyl alcohol amide sodium, and 0.05 parts of hydroxymethyl cellulose.

[0028] The preparation method is consistent with that described in Example 1.

[0029] Example 3

[0030] A high temperature resistant SBS modified asphalt comprises the following raw materials, measured by mass: 90 parts of base asphalt, 3.5 parts of SBS asphalt modifier, 2.7 parts of rubber oil extender, 3.5 parts of 400 mesh limestone powder, 0.25 parts of stabilizer, 0.15 parts of polyvinyl alcohol amide sodium, and 0.05 parts of hydroxymethyl cellulose.

[0031] The preparation method is consistent with that described in Example 1.

[0032] Example 4

[0033] A high temperature resistant SBS modified asphalt comprises the following raw materials, measured by mass: 92 parts of base asphalt, 2.8 parts of SBS asphalt modifier, 2.0 parts of rubber oil extender, 3.2 parts of 400 limestone powder, 0.25 parts of stabilizer, 0.15 parts of polyvinyl alcohol amide sodium, and 0.05 parts of hydroxymethyl cellulose.

[0034] The preparation method is consistent with that described in Example 1.

[0035] Example 5

[0036] A high temperature resistant SBS modified asphalt comprises the following raw materials, measured by mass: 90 parts of base asphalt, 3.5 parts of SBS asphalt modifier, 2.7 parts of rubber oil extender, 3.5 parts of 600 mesh limestone powder, 0.25 parts of stabilizer, 0.15 parts of polyvinyl alcohol amide sodium, and 0.05 parts of hydroxymethyl cellulose.

[0037] The preparation method is consistent with that described in Example 1.

[0038] Example 6

[0039] A high temperature resistant SBS modified asphalt comprises the following raw materials, measured by mass: 92 parts of base asphalt, 2.8 parts of SBS asphalt modifier, 2.0 parts of rubber oil extender, 3.2 parts of 600 mesh limestone powder, 0.25 parts of stabilizer, 0.15 parts of polyvinyl alcohol amide sodium, and 0.05 parts of hydroxymethyl cellulose.

[0040] The preparation method is consistent with that described in Example 1.

[0041] Comparative Example 1

[0042] A modified asphalt, comprising the following raw materials by weight: 92 parts of base asphalt, 4.6 parts of SBS asphalt modifier, 3.5 parts of rubber oil extender, 0.25 parts of stabilizer, 0.15 parts of polyvinyl alcohol amide sodium, and 0.05 parts of hydroxymethyl cellulose. The common modified asphalt is prepared according to the following steps: 1) The base asphalt is heated in an oven at 135°C until it flows, and then the SBS asphalt modifier is added and stirred for 20 minutes to allow the base asphalt to wrap the SBS asphalt modifier, so that the base asphalt and the SBS asphalt modifier form an oil-in-water state; 2) The mixture obtained by stirring the base asphalt and the SBS asphalt modifier is placed in a shearing machine, and the shearing machine is heated to 190° C., so that the mixture of the base asphalt and the SBS asphalt modifier is heated to 190° C., and sheared at 190° C. for 70 minutes; and the base material is obtained.

[0043] 3) Add rubber oil extender, stabilizer, sodium polyvinyl alcohol amide and hydroxymethyl cellulose to the base material obtained in step 2) in sequence, and stir and grow at 190° C. for 7 hours to finally obtain a high temperature resistant modified asphalt.

[0044] Comparative Example 2

[0045] A high temperature resistant SBS modified asphalt comprises the following raw materials, measured by mass: 90 parts of base asphalt, 4.5 parts of SBS asphalt modifier, 2.7 parts of rubber oil extender, 2.5 parts of 100 mesh limestone powder, 0.25 parts of stabilizer, 0.15 parts of polyvinyl alcohol amide sodium, and 0.05 parts of hydroxymethyl cellulose.

[0046] The preparation method is consistent with that described in Example 1.

[0047] Comparative Example 3

[0048] A high temperature resistant SBS modified asphalt comprises the following raw materials, measured by mass: 90 parts of base asphalt, 3.5 parts of SBS asphalt modifier, 2.7 parts of rubber oil extender, 3.5 parts of 325 mesh granite powder, 0.25 parts of stabilizer, 0.15 parts of polyvinyl alcohol amide sodium, and 0.05 parts of hydroxymethyl cellulose.

[0049] The preparation method is consistent with that described in Example 1.

[0050] The above-mentioned 325 mesh granite powder is purchased as a mineral processing product from Shandong Linyi Xinyuan Stone Powder Factory.

[0051] Comparative Example 4

[0052] A high temperature resistant SBS modified asphalt comprises the following raw materials, measured by mass: 90 parts of base asphalt, 4.5 parts of SBS asphalt modifier, 2.7 parts of rubber oil extender, 2.5 parts of 325 mesh granite powder, 0.25 parts of stabilizer, 0.15 parts of polyvinyl alcohol amide sodium, and 0.05 parts of hydroxymethyl cellulose.

[0053] The preparation method is consistent with that described in Example 1.

[0054] The above-mentioned 325 mesh granite powder is purchased as a mineral processing product from Shandong Linyi Xinyuan Stone Powder Factory.

[0055] Experimental example The asphalt products obtained in Examples 1-6 and Comparative Example 1 were tested, and the test results are shown in Table 1.

[0056] Table 1 Comparative results of the performance tests of the asphalt products of Comparative Example 1 and Examples 1-6 project Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 SBS asphalt modifier dosage 4.6 3.5 2.8 3.5 2.8 3.5 2.8 Stone powder fineness / mesh 0 325 325 400 400 600 600 Needle penetration (25℃), 0.1mm 56 50 52 44 45 43 42 Softening point, ℃ 66 70.5 69 76 75 73 72 Table 2 Performance test results of asphalt finished products of Comparative Examples 1-4 project Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 SBS asphalt modifier dosage 4.6 4.5 3.5 4.5 Stone powder fineness / mesh / 100 Granite powder 325 Granite powder 325 Needle penetration (25℃), 0.1mm 56 52 50 54 Softening point, ℃ 66 62 56 58 From the data in the above table, it can be seen that at 25°C, the needle penetration of the modified asphalts prepared in Examples 1-6 of the present invention is lower than that of the ordinary modified asphalt prepared in Comparative Example 1, and the softening point is significantly improved, with a normal distribution trend; the softening point of the modified asphalts prepared in Examples 1-6 is improved compared with the ordinary modified asphalts prepared in Comparative Examples 1-4 and other stone powders, and the heat resistance stability of the modified asphalt is significantly improved. In addition, the amount of SBS modifier used in the scheme of the present invention is reduced, and part of it is replaced by cheap limestone powder. The market value of SBS asphalt modifier is about 12,000 yuan / ton, while the market value of limestone powder is about 200 yuan / ton. While the cost is reduced, the performance is even better.

[0057] Comparative Examples 3 and 4 use granite powder. Compared with limestone powder as a modifier, the granite powder-modified asphalt has poor heat stability and a low softening point.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any equivalent substitutions, modifications, etc. made by technicians in this field without any creative work within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high temperature resistant SBS modified asphalt, characterized in that: The following raw materials are included by mass: 88-95 parts of base asphalt, 2.0-4.5 parts of SBS asphalt modifier, 1.0-3.5 parts of rubber oil extender, 0.16-0.37 parts of stabilizer, 3.0-5.0 parts of stone powder, 0.10-0.35 parts of polyvinyl alcohol amide sodium, and 0.05-0.10 parts of hydroxymethyl cellulose; wherein the fineness of the stone powder is 325-600 mesh.

2. The high temperature resistant SBS modified asphalt according to claim 1, characterized in that: The following raw materials are included by mass: 90 parts of base asphalt, 3.5 parts of SBS asphalt modifier, 2.7 parts of rubber oil extender, 3.5 parts of stone powder, 0.25 parts of stabilizer, 0.10-0.35 parts of polyvinyl alcohol amide sodium, and 0.05-0.10 parts of hydroxymethyl cellulose.

3. The high temperature resistant SBS modified asphalt according to claim 2, characterized in that: The amount of the polyvinyl alcohol amide sodium is 0.15 parts by mass, and the amount of the hydroxymethyl cellulose is 0.05 parts by mass.

4. The high temperature resistant SBS modified asphalt according to any one of claims 1 to 3, characterized in that: The stone powder is limestone powder.

5. The high temperature resistant SBS modified asphalt according to claim 4, characterized in that: The limestone powder is 400 mesh.

6. The high temperature resistant SBS modified asphalt according to claim 4, characterized in that: The limestone powder is formed by processing limestone, and the limestone is a by-product of limestone ore mining.

7. The high temperature resistant SBS modified asphalt according to claim 1, characterized in that: The base asphalt is No. 70 base asphalt; and the SBS asphalt modifier is a linear SBS asphalt modifier.

8. The high temperature resistant SBS modified asphalt according to claim 7, characterized in that: The matrix asphalt is one of Jingbo No. 70 A-grade road petroleum asphalt, Tipco No. 70 A-grade road petroleum asphalt, and Shell No. 70 A-grade road petroleum asphalt.

9. The high temperature resistant SBS modified asphalt according to claim 1, characterized in that: The stabilizer is XT series modified asphalt stabilizer.

10. The method for preparing the high temperature resistant SBS modified asphalt according to claim 1, characterized in that: The following steps are involved: 1) Heat the base asphalt in an oven at 135°C until it flows, add SBS asphalt modifier, and stir for 15-20 minutes to allow the base asphalt to wrap the SBS asphalt modifier, so that the base asphalt and the SBS asphalt modifier form a mixture in an oil-in-water state; 2) placing the mixture obtained by stirring the base asphalt and the SBS asphalt modifier in step 1) in a shearing machine, heating the shearing machine to 180-200° C., so that the mixture of the base asphalt and the SBS asphalt modifier is heated to 180-200° C., and obtaining a base material; 3) Shearing the base material obtained in step 2) at 180-200° C. for 40-50 minutes, and then putting the stone powder into the shearing machine and continuing shearing for 20-30 minutes to obtain a semi-finished modified asphalt; 4) Add the rubber oil extender, stabilizer, sodium polyvinyl alcohol amide and hydroxymethyl cellulose to the semi-finished modified asphalt obtained after shearing in step 3) in order, stir and develop at 180-200° C. for 5-8 hours to obtain high temperature resistant SBS modified asphalt.