High-weather-resistance high-viscosity asphalt modifier, high-viscosity asphalt and preparation method of high-weather-resistance high-viscosity asphalt modifier

Abstract

The invention relates to the technical field of asphalt modification, in particular to a high-weather-resistance and high-viscosity asphalt modifier which is mainly prepared from the following components in parts by weight: 5-20 parts of epoxidized soybean oil, 3-10 parts of tannic acid, 30-50 parts of SEBS (Styrene-Ethylene-Butylene-Styrene) and 25-55 parts of LOTADER3410. According to the present invention, under the respective performance and the mutual synergistic effect of the components, the obtained asphalt modifier is applied to asphalt modification, such that the viscosity toughness and the thermal stability of the prepared high-viscosity asphalt can be improved, the excellent ductility, the excellent viscosity, the excellent impact resistance, the excellent aging resistance and the excellent weather resistance are provided, and the good storage stability is provided; and the high-viscosity asphalt is not easy to split phases, good in heat storage stability and relatively good in applicability. The invention also provides a preparation method and application thereof. The preparation method is convenient and easy to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt modification, and in particular to a high-weatherability and high-viscosity asphalt modifier, high-viscosity asphalt and a preparation method thereof. Background Art

[0002] Compared with traditional asphalt, high-viscosity asphalt has excellent dynamic viscosity at 60°C, maintains high viscosity under high temperature conditions, is not easy to soften and deform, can effectively prevent road cracking and deformation, can better resist the extrusion and shear force of vehicle tires, and has good construction and workability. Therefore, high-viscosity asphalt is widely used in highways, urban roads, bridges and other projects. However, there are also some problems in actual use: factors such as temperature, ultraviolet radiation or harsh and extreme climatic conditions will accelerate the aging of high-viscosity asphalt, resulting in a decrease in its performance; at the same time, traffic conditions such as heavy load, overload, and frequent vehicle driving are also important factors affecting the weather resistance of high-viscosity asphalt, making fluidity shear deformation very easy to occur. Therefore, it is of great significance to study a high-viscosity asphalt modifier with anti-ultraviolet, anti-aging and high weather resistance. Summary of the invention

[0003] In view of the technical problems in the prior art, the purpose of the present invention is to provide a high-weather-resistant and high-viscosity asphalt modifier, which can effectively improve the viscosity and thermal stability of asphalt after modifying the asphalt, and has excellent ductility, aging resistance and weather resistance. At the same time, the high-viscosity asphalt is not easy to separate into phases and has good thermal storage stability. At the same time, the present invention provides a preparation method and application of the high-weather-resistant and high-viscosity asphalt modifier.

[0004] To achieve the above purpose, the technical solution provided by the present invention is: In a first aspect, the present invention provides a highly weather-resistant and highly viscous asphalt modifier, which is mainly prepared from the following components in parts by weight: 5 to 20 parts of epoxidized soybean oil, 3 to 10 parts of tannic acid, 30 to 50 parts of SEBS, and 25 to 55 parts of LOTADER® 3410.

[0005] The present application provides a highly weatherable and high-viscosity asphalt modifier, including epoxidized soybean oil, tannic acid, SEBS and LOTADER® 3410. Based on the respective properties of the above components and the synergistic effect between them, the obtained asphalt modifier is applied in asphalt modification, which can improve the viscosity and thermal stability of the prepared high-viscosity asphalt, and has excellent ductility, viscosity, impact resistance, aging resistance and weather resistance, as well as good storage stability and dispersibility. High-viscosity asphalt is not easy to phase separate, has good thermal storage stability, and has good applicability. It should be noted that in this application, other additives may be appropriately added according to the specific application environment.

[0006] Specifically, the SEBS is copolymerized from three monomers: styrene, ethylene and butene, wherein styrene is a hard segment, and ethylene and butene are soft segments; the SEBS molecular chain has a regular structure, with both hard and soft segment structures, good impact resistance and low temperature resistance, and can also increase the viscosity of the system.

[0007] The epoxidized soybean oil has an epoxide value of ≥6.6 and an iodine value of ≤3.0. The epoxidized soybean oil at this value has excellent thermal stability and light stability, can impart good mechanical strength and weather resistance to high-viscosity asphalt, and effectively improves the viscosity of high-viscosity asphalt while improving its toughness and impact strength; its smaller iodine value determines that it has a high degree of epoxidation, a low double bond content, and a higher UV resistance.

[0008] The LOTADER® 3410 is a random terpolymer of ethylene, butyl acrylate and maleic anhydride. On the one hand, it has polar groups similar to the polarity of asphalt, which can reduce the surface tension of asphalt and reduce segregation. On the other hand, the polarity of its ethylene copolymer is similar to the polarity of ethylene and butene in SEBS, which improves the dispersibility and stability of SEBS in the asphalt phase. More importantly, the maleic anhydride in the LOTADER® 3410 reacts with the phenolic structure of tannic acid to generate an ester group and a carboxyl structure. The carbonyl structure is more easily dispersed in the asphalt phase due to its similar polarity to asphalt, and has good compatibility with the asphalt phase. The generated carboxyl structure further undergoes a ring-opening reaction with the epoxy group of epoxidized soybean oil at high temperature to generate a hyperbranched polymer with high viscosity and low glass transition temperature in the asphalt phase. The polycyclic structure of the tannic acid itself also effectively increases the viscosity of the system. Therefore, under the performance of each of the above components and their synergistic effect, a stable and efficient high-weather-resistant and high-viscosity asphalt modifier is formed, which not only gives high-viscosity asphalt high viscosity, but also has good dispersibility, while also having impact resistance and weather resistance.

[0009] Based on the above technical solution, the epoxy value of the epoxidized soybean oil is ≥6.6 and the iodine value is ≤3.0. The epoxidized soybean oil was purchased from Shandong Kexing Chemical Co., Ltd. The tannic acid was purchased from Sigma Aldrich (Shanghai) Trading Co., Ltd., CAS No.: 1401-55-4, molecular weight: 1701.20; the specific gravity of the SEBS is 0.910g / cm³. SEBS was purchased from YH-533 produced by Baling Petrochemical, with a specific gravity of 0.910g / cm³. The LOTADER® 3410 has a melt index of 5.0g / 10min at 190°C and a load of 2.16KG, and was purchased from SK Chemicals of South Korea.

[0010] In a second aspect, the present invention provides a method for preparing a high-weather-resistant and high-viscosity asphalt modifier, comprising the following steps: Step 1: LOTADER® 3410 and SEBS are mixed evenly in a high-speed mixer according to a set ratio to obtain material 1; Step 2: Add the epoxidized soybean oil to material 1 according to a set ratio, and mix them evenly in a high-speed mixer to obtain material 2; Step 3: Add tannic acid to material 2 according to a set ratio and mix evenly in a high-speed mixer to obtain material 3; Step 4: Add material 3 from the main feed port into the parallel twin-screw extruder for extrusion and granulation, use water-cooling to cut the pellets, and after drying, obtain a high-weather-resistant and high-viscosity asphalt modifier.

[0011] Based on the above technical solution, in step one, the mixing speed is 50-800 rpm and the time is 10-50 min; in step two, the mixing speed is 50-800 rpm and the time is 10-60 min.

[0012] Based on the above technical solution, in step four, the screw speed is 200-400 rpm, the granulation temperature is 160-180°C, the pellets after water-cooled pelletizing are dried with hot air at 60-80°C, and a highly weather-resistant and highly viscous asphalt modifier is obtained after drying.

[0013] In a third aspect, the present invention provides a high-viscosity asphalt, including the above-mentioned high-weatherability and high-viscosity asphalt modifier.

[0014] Based on the above technical solution, the weight fraction of the high-weather-resistant and high-viscosity asphalt modifier in the high-viscosity asphalt is 7% to 13%. More preferably, the weight fraction of the high-weather-resistant and high-viscosity asphalt modifier in the high-viscosity asphalt is 12%.

[0015] In a fourth aspect, the present invention provides a high-viscosity asphalt mixture, including the above-mentioned high-viscosity asphalt.

[0016] In a fifth aspect, the present invention also provides an application of a high-viscosity asphalt mixture as a road construction material in road maintenance or road construction.

[0017] The beneficial effects of the technical solution provided by the present invention are: The present application provides a highly weather-resistant and highly viscous asphalt modifier, including epoxidized soybean oil, tannic acid, SEBS and LOTADER® 3410. Due to the respective properties of the above components and the synergistic effect between them, the obtained asphalt modifier is used in asphalt modification to improve the viscosity and thermal stability of the prepared high-viscosity asphalt, and has excellent ductility, viscosity, impact resistance, aging resistance and weather resistance, as well as good storage stability. The high-viscosity asphalt is not easy to phase separate, has good thermal storage stability, and has good applicability.

[0018] Also provided are a preparation method and application thereof, and the preparation method is convenient and easy to operate. DETAILED DESCRIPTION

[0019] The following will combine the contents in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items. It should be understood that, unless otherwise specified, various raw materials of the present invention can be obtained commercially.

[0021] Example 1 A high-weather-resistant and high-viscosity asphalt modifier is mainly prepared from the following components in parts by weight: 12 parts of epoxidized soybean oil, 7 parts of tannic acid, 46 parts of SEBS, and 35 parts of LOTADER® 3410.

[0022] A method for preparing a high-weather-resistant and high-viscosity asphalt modifier comprises the following steps: Step 1: LOTADER® 3410 and SEBS were mixed evenly in a high-speed mixer according to a set ratio at a speed of 500 rpm for 30 min to obtain material 1; Step 2: Add the epoxidized soybean oil to material 1 in a high-speed mixer according to a set ratio and mix evenly at a speed of 500 rpm for 50 min to obtain material 2; Step 3: Add tannic acid to material 2 according to a set ratio and mix evenly in a high-speed mixer at a speed of 300 rpm for 30 min to obtain material 3; Step 4: Add material 3 from the main feeding port into the parallel twin-screw extruder for extrusion and granulation, use water-cooling to cut the pellets, and obtain a high-weather-resistant and high-viscosity asphalt modifier after drying; the granulation temperature is 170°C, the screw speed is 300rpm, water-cooling pelletizing is used, and the obtained pellets are dried with 60°C hot air to obtain a high-weather-resistant and high-viscosity asphalt modifier after drying.

[0023] Example 2 A high-weather-resistant and high-viscosity asphalt modifier is mainly prepared from the following components in parts by weight: 15 parts of epoxidized soybean oil, 5 parts of tannic acid, 36 parts of SEBS, and 44 parts of LOTADER® 3410.

[0024] A method for preparing a high-weather-resistant and high-viscosity asphalt modifier comprises the following steps: Step 1: LOTADER® 3410 and SEBS were mixed evenly in a high-speed mixer according to a set ratio at a speed of 400 rpm for 40 min to obtain material 1; Step 2: Add the epoxidized soybean oil to material 1 in a high-speed mixer according to a set ratio and mix evenly at a speed of 500 rpm for 40 min to obtain material 2; Step 3: Add tannic acid to material 2 according to a set ratio and mix evenly in a high-speed mixer at a speed of 400 rpm for 30 min to obtain material 3; Step 4: Add material 3 from the main feeding port into the parallel twin-screw extruder for extrusion and granulation, and use water-cooled pelletizing to obtain a high-weather-resistant and high-viscosity asphalt modifier after drying; the granulation temperature is 170°C, the screw speed is 300rpm, and water-cooled pelletizing is used. The obtained pellets are dried with hot air at 65°C to obtain a high-weather-resistant and high-viscosity asphalt modifier after drying.

[0025] Example 3 A high-weather-resistant and high-viscosity asphalt modifier is mainly prepared from the following components in parts by weight: 10 parts of epoxidized soybean oil, 4 parts of tannic acid, 45 parts of SEBS, and 41 parts of LOTADER® 3410.

[0026] A method for preparing a high-weather-resistant and high-viscosity asphalt modifier comprises the following steps: Step 1: LOTADER® 3410 and SEBS were mixed evenly in a high-speed mixer at a set ratio at a speed of 300 rpm for 40 min to obtain material 1; Step 2: Add the epoxidized soybean oil to material 1 in a high-speed mixer according to a set ratio and mix evenly at a speed of 400 rpm for 60 min to obtain material 2; Step 3: Add tannic acid to material 2 according to a set ratio and mix evenly in a high-speed mixer at a speed of 500 rpm for 40 min to obtain material 3; Step 4: Add material 3 from the main feeding port into the parallel twin-screw extruder for extrusion and granulation, and use water-cooled pelletizing. After drying, a high-weather-resistant and high-viscosity asphalt modifier is obtained; the granulation temperature is 170°C, the screw speed is 300rpm, water-cooled pelletizing is used, and the obtained pellets are dried with hot air at 60°C to obtain a high-weather-resistant and high-viscosity asphalt modifier after drying.

[0027] Example 4 A high-weather-resistant and high-viscosity asphalt modifier is mainly prepared from the following components in parts by weight: 17 parts of epoxidized soybean oil, 7 parts of tannic acid, 48 parts of SEBS, and 28 parts of LOTADER® 3410.

[0028] A method for preparing a high-weather-resistant and high-viscosity asphalt modifier comprises the following steps: Step 1: LOTADER® 3410 and SEBS were mixed uniformly in a high-speed mixer at a set ratio at a speed of 300 rpm for 20 min to obtain material 1; Step 2: Add the epoxidized soybean oil to material 1 in a high-speed mixer according to a set ratio and mix evenly at a speed of 400 rpm for 40 minutes to obtain material 2; Step 3: Add tannic acid to material 2 in a set ratio and mix evenly in a high-speed mixer at a speed of 400 rpm for 50 min to obtain material 3; Step 4: Add material 3 from the main feeding port into the parallel twin-screw extruder for extrusion and granulation, and use water-cooled pelletizing to obtain a high-weather-resistant and high-viscosity asphalt modifier after drying; the granulation temperature is 170°C, the screw speed is 200rpm, water-cooled pelletizing is used, and the obtained pellets are dried with hot air at 60°C to obtain a high-weather-resistant and high-viscosity asphalt modifier after drying.

[0029] Example 5 A high-weather-resistant and high-viscosity asphalt modifier is mainly prepared from the following components in parts by weight: 9 parts of epoxidized soybean oil, 5 parts of tannic acid, 34 parts of SEBS, and 52 parts of LOTADER® 3410.

[0030] A method for preparing a high-weather-resistant and high-viscosity asphalt modifier comprises the following steps: Step 1: LOTADER® 3410 and SEBS were mixed evenly in a high-speed mixer according to a set ratio at a speed of 300 rpm for 30 min to obtain material 1; Step 2: Add the epoxidized soybean oil to material 1 in a high-speed mixer according to a set ratio and mix evenly at a speed of 500 rpm for 50 min to obtain material 2; Step 3: Add tannic acid to material 2 in a set ratio and mix evenly in a high-speed mixer at a speed of 300 rpm for 50 min to obtain material 3; Step 4: Add material 3 from the main feeding port into the parallel twin-screw extruder for extrusion and granulation, and use water-cooled pelletizing. After drying, a high-weather-resistant and high-viscosity asphalt modifier is obtained; the granulation temperature is 170°C, the screw speed is 200rpm, water-cooled pelletizing is used, and the obtained pellets are dried with hot air at 65°C to obtain a high-weather-resistant and high-viscosity asphalt modifier after drying.

[0031] Comparative Example 1 An asphalt modifier is mainly prepared from the following components in parts by weight: 12 parts of dioctyl phthalate, 7 parts of tannic acid, 46 parts of SEBS, and 35 parts of LOTADER® 3410. Among them, dioctyl phthalate is purchased from Shandong Kexing Chemical Co., Ltd., with a CAS number of 117-81-7; and the same tannic acid, SEBS, and LOTADER® 3410 as in Example 1 are used.

[0032] The preparation method of the above-mentioned asphalt modifier comprises the following steps: Step 1: LOTADER® 3410 and SEBS were mixed evenly in a high-speed mixer according to a set ratio at a speed of 500 rpm for 30 min to obtain material 1; Step 2: Add dioctyl phthalate to material 1 in a high-speed mixer according to a set ratio and mix evenly at a speed of 500 rpm for 50 min to obtain material 2; Step 3: Add tannic acid to material 2 according to a set ratio and mix evenly in a high-speed mixer at a speed of 300 rpm for 30 min to obtain material 3; Step 4: Add material 3 from the main feeding port to the parallel twin-screw extruder for extrusion and granulation, use water-cooled pelletizing, and obtain asphalt modifier after drying; the granulation temperature is 170°C, the screw speed is 300rpm, water-cooled pelletizing is used, and the obtained pellets are dried with 60°C hot air to obtain asphalt modifier after drying.

[0033] Comparative Example 2 An asphalt modifier is mainly prepared from the following components in parts by weight: 12 parts of epoxidized soybean oil, 7 parts of bisphenol A, 46 parts of SEBS, and 35 parts of LOTADER® 3410. Bisphenol A is purchased from Sigma-Aldrich (Shanghai) Trading Co., Ltd., with a CAS number of 80-05-7; the same epoxidized soybean oil, tannic acid, and LOTADER® 3410 as in Example 1 are used.

[0034] The preparation method of the above-mentioned asphalt modifier comprises the following steps: Step 1: LOTADER® 3410 and SEBS were mixed evenly in a high-speed mixer according to a set ratio at a speed of 500 rpm for 30 min to obtain material 1; Step 2: Add the epoxidized soybean oil to material 1 in a high-speed mixer according to a set ratio and mix evenly at a speed of 500 rpm for 50 min to obtain material 2; Step 3: Add bisphenol A to material 2 in a set ratio and mix evenly in a high-speed mixer at a speed of 300 rpm for 30 min to obtain material 3; Step 4: Add material 3 from the main feed port to the parallel twin-screw extruder for extrusion and granulation, use water cooling to cut the pellets, and after drying, obtain the asphalt modifier. The granulation temperature is 170°C, the screw speed is 300rpm, water cooling is used for pelletizing, and the obtained pellets are dried by hot air at 60°C to obtain the asphalt modifier after drying.

[0035] Comparative Example 3 An asphalt modifier is mainly prepared from the following components in parts by weight: 12 parts of epoxidized soybean oil, 7 parts of tannic acid, 46 parts of SBS, and 35 parts of LOTADER® 3410. SBS is a styrene-butadiene-styrene block copolymer purchased from Baling Petrochemical with a grade of YH-796; the same epoxidized soybean oil, tannic acid and LOTADER® 3410 as in Example 1 are used.

[0036] The preparation method of the above-mentioned asphalt modifier comprises the following steps: Step 1: LOTADER® 3410 and SBS were mixed evenly in a high-speed mixer according to a set ratio at a speed of 500 rpm for 30 min to obtain material 1; Step 2: Add the epoxidized soybean oil to material 1 in a high-speed mixer according to a set ratio and mix evenly at a speed of 500 rpm for 50 min to obtain material 2; Step 3: Add tannic acid to material 2 according to a set ratio and mix evenly in a high-speed mixer at a speed of 300 rpm for 30 min to obtain material 3; Step 4: Add material 3 from the main feed port to the parallel twin-screw extruder for extrusion and granulation, use water cooling to cut the pellets, and after drying, obtain the asphalt modifier. The granulation temperature is 170°C, the screw speed is 300rpm, water cooling is used for pelletizing, and the obtained pellets are dried by hot air at 60°C to obtain the asphalt modifier after drying.

[0037] Comparative Example 4 An asphalt modifier is mainly prepared from the following components in parts by weight: 12 parts of epoxidized soybean oil, 7 parts of tannic acid, 46 parts of SEBS, and 35 parts of EVA. EVA is ethylene-vinyl acetate copolymer purchased from DuPont Company of the United States with a brand number of 11D554; the same epoxidized soybean oil, tannic acid and SEBS as in Example 1 are used.

[0038] The preparation method of the above-mentioned asphalt modifier comprises the following steps: Step 1: EVA and SEBS are mixed evenly in a high-speed mixer according to a set ratio at a speed of 500 rpm for 30 min to obtain material 1; Step 2: Add the epoxidized soybean oil to material 1 in a high-speed mixer according to a set ratio and mix evenly at a speed of 500 rpm for 50 min to obtain material 2; Step 3: Add tannic acid to material 2 according to a set ratio and mix evenly in a high-speed mixer to obtain material 3; Step 4: Add material 3 from the main feed port to the parallel twin-screw extruder for extrusion and granulation, use water cooling to cut the pellets, and after drying, obtain the asphalt modifier. The granulation temperature is 170°C, the screw speed is 300rpm, water cooling is used for pelletizing, and the obtained pellets are dried by hot air at 60°C to obtain the asphalt modifier after drying.

[0039] Experimental results and performance analysis 1. Preparation and performance testing of high-viscosity asphalt The test evaluation of the high-weather-resistant and high-viscosity asphalt modifier prepared in the examples of the present application and the asphalt modifier prepared in the comparative examples are characterized by the test performance index of the prepared high-viscosity asphalt. That is, in order to characterize the performance of the high-weather-resistant and high-viscosity asphalt modifier prepared in Examples 1 to 5 and compare it with the asphalt modifier of Comparative Examples 1 to 4, different modifiers prepared in Examples 1 to 5 and Comparative Examples 1 to 4 are used respectively, and the corresponding high-viscosity asphalt is prepared according to the above method, and the performance of different high-viscosity asphalts is tested.

[0040] The preparation method of high-viscosity asphalt is as follows: in a 1.2L stainless steel straight-cylinder reactor with insulation interlayer, add 880g of asphalt and preheat to 180℃, add 120g of modifier within 30min, stir at 500rpm until completely melted, and develop at 180℃ for 2h to prepare high-viscosity asphalt. The mass fraction of asphalt modifier in the prepared high-viscosity asphalt is 12%. The asphalt comes from Jingbo Petrochemical Co., Ltd., and the test results of its various indicators are: needle penetration (0.1mm): 60-80, elongation 10℃ (cm): 20, softening point (℃): 46, solubility (%): 99.5, dynamic viscosity 60℃ Pa·s: 180.

[0041] According to the standard “JTGE20-2011 Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering”, various relevant indicators of high-viscosity asphalt and asphalt mixtures were tested. The specific test evaluation results are shown in Table 1.

[0042] Table 1 Evaluation results of high viscosity asphalt

[0043] According to the performance data analysis of high-viscosity asphalt prepared by asphalt modifiers of Examples 1 to 5 and Comparative Examples 1 to 4 in Table 1, it can be seen that: Compared with Example 1, the asphalt modifier prepared by replacing epoxidized soybean oil with dioctyl phthalate has a higher needle penetration and a significantly reduced dynamic viscosity at 60°C, indicating that the addition of the epoxidized soybean oil component in the present application causes the epoxy group to undergo a ring-opening reaction, which effectively increases the ductility and viscosity of the asphalt and improves the weather resistance of the asphalt.

[0044] Compared with Example 1, in Comparative Example 2, the asphalt modifier prepared by replacing tannic acid with bisphenol A has lower viscosity and toughness of the modified asphalt, indicating that the addition of tannic acid in the present application effectively improves the viscosity and toughness of the asphalt, and the cyclic polyphenol structure stabilized by tannic acid plays a better cross-linking role in the polymer hyperbranching process.

[0045] In Comparative Example 3, compared with Example 1, the asphalt modifier prepared by replacing SEBS with SBS has a significantly decreased ductility after aging of the modified asphalt, indicating that SEBS in the present application has a good effect on improving the thermal stability of asphalt and has excellent aging resistance.

[0046] Comparative Example 4 Compared with Example 1, the asphalt modifier prepared by replacing LOTADER® 3410 with EVA has different degrees of decrease in 60°C dynamic viscosity, elongation before aging and elongation after aging, needle penetration and viscosity toughness of the prepared modified asphalt, indicating that the hyperbranched polymer produced by adding LOTADER® 3410 and its copolymer anhydride in this application effectively improves the viscosity and viscosity toughness of the asphalt. At the same time, it can also be clearly seen that the high-viscosity asphalt prepared by the high-viscosity asphalt modifier in Examples 1 to 5 has higher viscosity and better aging resistance than the modified asphalt prepared by the asphalt modifier in Comparative Examples 1 to 4. At the same time, according to the storage stability separation test index, it can be seen that the high-viscosity asphalt in the present application also has good storage stability, that is, the high-viscosity asphalt is not easy to phase separate, and the thermal storage stability performance is stable.

[0047] 2. Preparation and performance testing of high-viscosity asphalt mixture According to GB / T 36143-2018 High modulus anti-fatigue asphalt mixture for roads, a standard sample of high-viscosity asphalt mixture was prepared and tested, and the test results are shown in Table 2. The amount of high-viscosity asphalt binder was 5.3%.

[0048] Table 2 Evaluation results of high viscosity asphalt mixture

[0049] According to the test data in Table 2, the high-viscosity asphalt mixture prepared by using the high-weather-resistant and high-viscosity asphalt modifier in Examples 1 to 5 has significantly improved low-temperature stiffness modulus and high-temperature dynamic stability compared to the modified asphalt mixture prepared by using the asphalt modifier in Comparative Examples 1 to 4, indicating that the asphalt mixture prepared by using the high-weather-resistant and high-viscosity asphalt modifier provided in the present application has significant low-temperature resistance and high-temperature rutting resistance.

[0050] Through the test results analysis of Tables 1 and 2 of Examples 1 to 5 and Comparative Examples 1 to 4, it can be seen that the high-viscosity asphalt mixture prepared by the high-weather-resistant high-viscosity asphalt modifier in this application has good dispersion stability and high viscosity, not only has high weather resistance, but also effectively improves the problem of rutting. Therefore, the epoxidized soybean oil, tannic acid, SEBS, and LOTADER® 3410 components cooperate with each other, so that the comprehensive performance of the asphalt modifier in high-viscosity asphalt and high-viscosity asphalt mixture as a whole can be achieved, and replacing similar components cannot achieve the excellent effect of the present invention.

[0051] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention. In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high-weather-resistant and high-viscosity asphalt modifier, characterized in that: The invention is mainly prepared from the following components in parts by weight: 5 to 20 parts of epoxidized soybean oil, 3 to 10 parts of tannic acid, 30 to 50 parts of SEBS and 25 to 55 parts of LOTADER® 3410.

2. A highly weather-resistant and highly viscous asphalt modifier according to claim 1, characterized in that: The epoxidized soybean oil has an epoxide value of ≥6.6 and an iodine value of ≤3.

0.

3. A method for preparing a highly weather-resistant and highly viscous asphalt modifier according to claim 1 or 2, characterized in that: The following steps are involved: Step 1: LOTADER® 3410 and SEBS are mixed evenly in a high-speed mixer according to a set ratio to obtain material 1; Step 2: Add the epoxidized soybean oil to material 1 according to a set ratio, and mix them evenly in a high-speed mixer to obtain material 2; Step 3: Add tannic acid to material 2 according to a set ratio and mix evenly in a high-speed mixer to obtain material 3; Step 4: Add material 3 from the main feed port into the parallel twin-screw extruder for extrusion and granulation, use water-cooling to cut the pellets, and after drying, obtain a high-weather-resistant and high-viscosity asphalt modifier.

4. The method for preparing a high-weather-resistant and high-viscosity asphalt modifier according to claim 3, characterized in that: In the step 1, the mixing speed is 50-800 rpm, and the mixing time is 10-50 min; in the step 2, the mixing speed is 50-800 rpm, and the mixing time is 10-60 min.

5. The method for preparing a high-weather-resistant and high-viscosity asphalt modifier according to claim 3, characterized in that: In the step 4, the screw speed is 200-400 rpm, the granulation temperature is 160-180° C., and the pellets after water-cooled pelletizing are dried with hot air at 60-80° C. to obtain a high-weather-resistant and high-viscosity asphalt modifier.

6. A high viscosity asphalt, characterized in that: It includes the high weather resistance and high viscosity asphalt modifier described in claim 1 or 2 or the high weather resistance and high viscosity asphalt modifier prepared by the preparation method described in any one of claims 3-5.

7. A high viscosity asphalt according to claim 6, characterized in that: The weight fraction of the high-weatherability high-viscosity asphalt modifier in the high-viscosity asphalt is 7% to 13%.

8. A high-viscosity asphalt mixture, characterized in that: Including the high-viscosity asphalt according to claim 6.

9. Use of the high-viscosity asphalt mixture according to claim 8 as a road building material in road maintenance or road construction.

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