Composite high-viscosity modified asphalt and preparation method thereof

Abstract

The invention belongs to the technical field of road asphalt, and particularly relates to composite high-viscosity modified asphalt and a preparation method thereof, and the composite high-viscosity modified asphalt comprises the following components in parts by weight: 100 parts of matrix asphalt, 2-15 parts of a macromolecular copolymer, 3-8 parts of a petroleum resin modifier, 5-10 parts of a cosolvent, 0-5 parts of polyethylene, 0.1-0.4 part of a stabilizer and 0.2-0.5 part of a coupling agent. According to the technical scheme, modifiers such as the petroleum resin and the polyethylene are compounded and modified with the matrix asphalt, so that the compatibility problem can be solved, the segregation phenomenon is avoided, and the performance stability of the asphalt is effectively improved on the basis of keeping respective basic characteristics; the novel composite modified high-viscosity asphalt with enhanced or optimized characteristics is obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of road asphalt, and particularly relates to a composite high-viscosity modified asphalt and a preparation method thereof. Background Art

[0002] As a preventive maintenance technology, the drainage type ultra-thin layer asphalt overlay is generally used in sections with heavy traffic and easy rutting. This ultra-thin overlay is about 2cm thick and consists of a large void ratio, rough surface texture, and a small particle size mixture ratio. It has excellent drainage performance, anti-skid performance, and wear resistance. The paving of ultra-thin overlay asphalt concrete not only requires professional equipment, modified asphalt, and discontinuous grading, but also has a small improvement in the overall bearing capacity of the road surface due to the thin paving thickness, so the requirements for bonding materials are also high. Minor reflective cracks, rutting and other diseases that appear in actual engineering applications are often caused by poor bonding between the bonding materials between the surface layer and the lower layer. Therefore, the use of high-viscosity modified asphalt with better performance is the most direct and effective method.

[0003] At present, the preparation method of high-viscosity modified asphalt is divided into two types according to the process, one is a dry method and the other is a wet method. The dry process is to first mix the high-viscosity modifier with the base asphalt, and then directly put it into the hot mineral material, and mix it on-site in the mixing plant to obtain the asphalt mixture. Patent CN110922768B discloses a direct-injection high-viscosity asphalt modifier and its preparation method and application. The modifier includes 4303 star-shaped SBS, 1301 linear SBS, furfural extracted oil, compound petroleum resin and kaolin. The preparation method does not require high-intensity shearing, which reduces the property degradation of asphalt caused by thermal aging. However, this method uses a high-viscosity modifier to be directly put into the mixture. Although the process is simple, it is easy to have uneven stirring, and the effect of improving the performance of the asphalt mixture is unstable, which is easy to cause the problem of poor adhesion of asphalt and poor water stability of the mixture.

[0004] The corresponding wet process refers to adding SBS modifier to the base asphalt and preparing high-viscosity modified asphalt through high-speed shear mixing. Compared with directly adding high-viscosity modifiers, the wet process is easier to control quality through technical indicators and has better stability between different batches.

[0005] Patent CN202310330933.6 discloses a method for preparing high-viscosity and high-elastic rubber modified asphalt, which mainly improves the thermal stability of the modified asphalt by performing two high-speed shear grinding on the asphalt mixture to accelerate the melting and dispersion of the polymer modifier in the matrix asphalt. However, high-dosage polymer modified asphalt often has compatibility problems between SBS modifier and asphalt during storage and transportation of finished products due to the large amount of modifier and high viscosity. It is very easy to cause polymer segregation, resulting in the inability to store the product for a long time.

[0006] Patent CN107189470A discloses a technology for modifying high-viscosity asphalt. By adding butadiene-styrene block copolymer and low molecular weight polymer synthetic resin for modification, modified high-viscosity asphalt with good storage stability is prepared. However, the invention patent has a single indicator to characterize its storage stability, which only includes the quality change after aging. The evaluation index is single, lacks the characterization of the storage stability of asphalt, and cannot reflect its true high-temperature stability performance. Summary of the invention

[0007] The purpose of the present invention is to provide a composite high-viscosity modified asphalt and a preparation method to solve the compatibility problem between polymers in current high-viscosity asphalt, improve its performance stability, and provide a new composite modified high-viscosity asphalt with enhanced or optimized properties while maintaining their respective basic properties.

[0008] To achieve the above objectives, this application is implemented through the following technical solutions: A composite high-viscosity modified asphalt consists of 100 parts by weight of base asphalt, 2-15 parts of high molecular copolymer, 3-8 parts of petroleum resin modifier, 0-5 parts of polyethylene, 0.1-0.4 parts of stabilizer and 0.2-0.5 parts of coupling agent.

[0009] Furthermore, the base asphalt is No. 70 and / or No. 90 asphalt refined by atmospheric and vacuum mixing.

[0010] Furthermore, the high molecular polymer includes SBS and / or SEBS, wherein SBS is a linear structure with a molecular weight of 50,000-250,000, and SEBS is a low molecular weight linear SEBS with a styrene content of 34Wt%, 35Wt%, and 36Wt%. If SBS and SEBS are included at the same time, the weight ratio of SBS to SEBS is 1:1-3:1.

[0011] Furthermore, the petroleum resin is selected from one or a combination of C5 petroleum resin and C9 petroleum resin, has a molecular weight of 440-3000, a refractive index of 1.512, and a softening point of 100°C-140°C.

[0012] Furthermore, the co-solvent comprises one of aromatic oil, naphthenic distillate oil, and furfural-reduced oil.

[0013] Furthermore, the polyethylene is low-density polyethylene or recycled waste material, and the melt flow index is 2-30g / 10min.

[0014] Furthermore, the stabilizer is one or more of Runfeng Boyue stabilizer, Huatong stabilizer, and Wasabi stabilizer.

[0015] Furthermore, the coupling agent is selected from one or both of siloxane coupling agents KH2560 and KH550.

[0016] A method for preparing any of the above-mentioned composite high-viscosity modified asphalts comprises the following steps: S1. Prepare raw materials according to the set ratio; S2. Heat the base asphalt to 170-180°C at a stirring speed of 100-200 r / min until the asphalt is in a molten state, add the pre-weighed SBS and SEBS polymer blend into the reactor, increase the speed to 300 r / min, and stir for 1 hour after entering the pre-swelling stage; S3. After the pre-swelling is completed, the mixture is processed by a colloid mill at a speed of 3000 r / min for 30 minutes; S4, after the colloid mill treatment in step S3, add the weighed polyethylene and petroleum resin modifier to the mixture, stir evenly until the temperature is constant, add the cosolvent, stabilizer, and coupling agent, and carry out the medium swelling reaction under heating reflux conditions for 6-8 hours; S5. The mixture after the medium swelling reaction in step S4 is processed by a colloid mill at a rotation speed of 3000 r / min for 30-60 minutes to obtain a composite high-viscosity modified asphalt.

[0017] Furthermore, after step S5, the prepared composite high-viscosity modified asphalt is subjected to performance tests, including viscosity, high and low temperature performance, viscosity-toughness performance, and aging performance, to verify whether it meets the set requirements.

[0018] The beneficial effects of the present invention are: Compared with the existing modified asphalt, this technical solution uses petroleum resin, polyethylene and other modifiers to compositely modify the base asphalt, which not only solves the compatibility problems between each other and avoids the occurrence of segregation, but also effectively improves the performance stability of the asphalt while maintaining their respective basic properties, thereby obtaining a new composite modified high-viscosity asphalt with enhanced or optimized properties.

[0019] First, compared with the existing high-viscosity modified asphalt prepared by direct dry casting, the high-viscosity modified asphalt of this technical solution has a higher viscosity, which can effectively solve the problems of ordinary asphalt flowing easily at high temperature and brittle cracking at low temperature, and has a stable effect on improving the performance of asphalt mixture. Secondly, by adding polyethylene and petroleum resin materials, the storage stability and aging performance can be effectively improved, and the durability and service life of asphalt can be improved. Finally, in view of the fact that the characterization of storage stability indicators of existing products is too single, this technical solution adds the softening point difference before and after aging and the softening point difference before and after aging at 175°C and 96h different storage times to ensure that it meets the set requirements. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is described in detail below through examples. The following examples are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, but cannot be construed as limiting the technical solution of the present invention.

[0021] The composite high-viscosity modified asphalt of the present technical solution improves the compatibility of modified asphalt with high molecular polymers to avoid segregation of high-viscosity modified asphalt during use and improves its performance stability; simplifies the preparation process of modified asphalt, reduces production costs, and makes it more suitable for large-scale production; improves the viscosity and toughness of asphalt binder, resulting in poor impact and scatter resistance of the road surface, effectively reducing the peeling, potholes and other diseases of the asphalt road surface; improves the performance of modified asphalt without increasing its cost, and effectively improves the durability and environmental adaptability of the road surface.

[0022] The present application provides a composite modified asphalt which selects a specific ratio of base asphalt, high molecular polymer, petroleum resin, polyethylene PE, cosolvent, stabilizer and coupling agent as raw materials, wherein the ratio of base asphalt is 100 parts, the ratio of high molecular copolymer is 2-10 parts, the ratio of petroleum resin modifier is 3-8 parts, the ratio of polyethylene PE is 0-5 parts, the ratio of stabilizer is 0.1-0.4 parts, and the ratio of coupling agent is 0.2-0.5 parts.

[0023] In the present application, the base asphalt is 70# and / or 90# A-grade asphalt mixed and refined under atmospheric and vacuum conditions. The base asphalt is selected from 70A-grade asphalt of Jingbo Petrochemical Co., Ltd.

[0024] In the present application, the polymers herein include styrene-butadiene-styrene triblock copolymer (SBS) and hydrogenated styrene-butadiene-styrene triblock copolymer (SEBS). Among them, SBS is a linear structure with a molecular weight of 50,000-250,000, selected from one or more of Yueyang Petrochemical 791-H SBS, Baling Petrochemical YH-791SBS and Hainan Petrochemical 791SBS. SEBS is Yueyang Petrochemical YH-501 low molecular weight linear SEBS with a styrene content of 34Wt%, 35Wt%, and 36Wt%. If both SBS and SEBS are included, the weight ratio of SBS to SEBS is 1:1-3:1.

[0025] In the present application, the petroleum resin is selected from one or a combination of C5 petroleum resin and C9 petroleum resin. The manufacturer is Henan Ruike Petroleum Resin Co., Ltd. The petroleum resins are all granular, have the characteristics of slow separation and not easy to degrade, have a molecular weight of 440-3000, a refractive index of 1.512, and a softening point of 100°C-140°C.

[0026] In the present application, the cosolvent comprises one of aromatic oil, naphthenic distillate oil, and furfural extraction oil, preferably one or more of Dongying Mantec Petrochemical Co., Ltd.'s extender or aromatic oil.

[0027] In the present application, the polyethylene PE comes from the manufacturer Yanshan Petrochemical Low-density Polyethylene, and recycled waste materials can also be used, and the melt flow index is 2 to 30 g / 10 min.

[0028] In the present application, the stabilizer is one or more of Runfeng Boyue stabilizer, Huatong stabilizer, and Wasabi stabilizer.

[0029] In the present application, the coupling agent is selected from siloxane coupling agent (KH2560) or KH550 (30%, mass fraction).

[0030] The present invention also provides a method for preparing the highly compatible composite high-viscosity modified asphalt of the above technical solution, comprising the following steps: S1. Prepare the raw materials. First weigh the high molecular polymer, polyethylene, and petroleum resin. The selection of these raw materials can ensure that the prepared high-viscosity modified asphalt has higher viscosity, excellent high temperature stability and anti-aging performance.

[0031] S2. Heat the base asphalt to 170-180°C at a stirring speed of 100-200 r / min until the asphalt is in a molten state, add the pre-weighed SBS and SEBS polymer blend into the reactor, increase the speed to 300 r / min, enter the pre-swelling stage and stir for 1 hour.

[0032] S3. After the pre-swelling is completed, the mixture is processed by a colloid mill. The model of the colloid mill is JM-100, the rotation speed is 3000r / min, and the processing time is 30 minutes.

[0033] S4. After being processed by the colloid mill, weighed polyethylene and two kinds of petroleum resins are added to the mixture, stirred evenly until the temperature is constant, and then co-solvents, stabilizers and coupling agents are added to carry out medium swelling reaction under heating reflux conditions for 6-8 hours.

[0034] S5. The mixture after the medium swelling reaction is processed by a colloid mill at a rotation speed of 3000 r / min for 30-60 minutes to obtain a composite high-viscosity modified asphalt.

[0035] This application also includes testing the performance of the prepared high-viscosity modified asphalt, including viscosity, high and low temperature performance, viscosity-toughness performance, aging performance, etc., to verify whether it meets the use requirements. Example 1

[0036] Heat 100 parts of No. 70 base asphalt to 180℃, add 8 parts of Yueyang Petrochemical 791-H SBS, 3 parts of Yueyang Petrochemical YH-501 SEBS (styrene content is 34Wt%) polymer blend, stir at 300r / min, and swell and stir for 1h. After pre-swelling, enter the JM-100 colloid mill for shearing. After shearing for 30min, add 5 parts of Rick C5 petroleum resin and 3 parts of Yanshan polyethylene PE in the auxiliary material tank, blend with the asphalt mixture through the lifting pump and pump into the development tank, finally add 0.3 parts of Boyue stabilizer, 0.2 parts of silicone KH2560 coupling agent, and 6 parts of Mantek cosolvent. After 8h of development, it is treated by the colloid mill at a speed of 3000r / min for 30 minutes to obtain high-viscosity modified asphalt. Example 2

[0037] Heat 100 parts of No. 70 base asphalt to 180℃, add 7 parts of Baling Petrochemical YH-791SBS, 4 parts of Yueyang Petrochemical YH-501 SEBS (styrene content is 35Wt%) polymer blend, stir at 300r / min, and swell and stir for 1h. After pre-swelling, enter the JM-100 colloid mill for shearing. After shearing for 30 minutes, add 6 parts of Rick C9 petroleum resin and 2 parts of Yanshan polyethylene PE in the auxiliary material tank, blend with the asphalt mixture through the lifting pump and pump into the development tank, finally add 0.3 parts of Huatong stabilizer, 0.2 parts of silicone KH2550 coupling agent, and 5 parts of Furunda aromatic oil. After development for 8 hours, it is treated by the colloid mill at a speed of 3000r / min for 30 minutes to obtain high-viscosity modified asphalt. Example 3

[0038] Heat 100 parts of No. 70 base asphalt to 180°C, add 7 parts of Hainan Petrochemical YH-791SBS, 5 parts of Yueyang Petrochemical YH-501 SEBS (styrene content 36Wt%) polymer blend, stir at 300r / min, and swell and stir for 1h. After pre-swelling, enter the JM-100 colloid mill for shearing. After shearing for 30 minutes, add 6 parts of Rick C9 petroleum resin and 2 parts of waste polyethylene PE to the auxiliary material tank, blend with the asphalt mixture through the lifting pump and pump into the development tank, finally add 0.3 parts of wasabi stabilizer, 0.25 parts of silicone KH2560 coupling agent, and 6 parts of cycloalkyl distillate oil. After 6 hours of development, it is treated by a colloid mill at a speed of 3000r / min for 30 minutes to obtain high-viscosity modified asphalt.

[0039] Comparative Example 1 Heat 100 parts of No. 70 base asphalt to 180℃, add 8 parts of Yueyang Petrochemical 791-H SBS and 3 parts of Yueyang Petrochemical YH-501 SEBS (styrene content is 34Wt%) polymer blend, stir at 300r / min, and swell and stir for 1h. After pre-swelling, enter the JM-100 colloid mill for shearing, and after shearing for 30min, drive into the development tank, and finally add 0.3 parts of Boyue stabilizer, 0.2 parts of silicone KH2560 coupling agent, and 6 parts of Mantek cosolvent, and swell and develop for 8h.

[0040] Comparative Example 2 Heat 100 parts of No. 70 base asphalt to 180°C, add 11 parts of Yueyang Petrochemical 791-H SBS, stir at 300r / min, and swell and stir for 1 hour. After pre-swelling, enter the JM-100 colloid mill for shearing, and directly drive into the development tank after shearing for 30 minutes, add 0.3 parts of Boyue stabilizer, 0.2 parts of silicone KH2560 coupling agent, and 6 parts of Mantek cosolvent, and swell and develop for 8 hours.

[0041] Table 1 Test results of different implementation cases and comparison cases Table 2 Stable storage test results of Example 1 and Comparative Example 1

[0042] As can be seen from Table 1, the three high-viscosity modified asphalt samples prepared by the JM-100 colloid mill using the technical solution have stable performance in various indicators. While having high dynamic viscosity, its ductility, residual ductility after aging, and softening point difference before and after aging have all been significantly improved. In addition, in the control experiment, the samples prepared by this technical solution are better than the samples modified by a single polymer in terms of segregation and softening point difference before and after aging, and have better thermal stability.

[0043] Comparing the changes in softening point before and after aging at different storage times at 175°C between the single polymer modified comparative example 1 and the composite modified example 1 can reflect its high temperature thermal stability storage. It can be seen from Tables 1 and 2 that the values ​​of both groups of samples have changed. In the initial state, the softening point difference of the composite modified sample is 4.2°C, and the softening point of the single polymer modified sample is 3.4°C. As time goes by, when the storage time is 24 hours, the softening point of the composite modified sample becomes 3.8°C, and the softening point of the single polymer modified sample becomes 5.0°C; when the storage time is 48 hours, the softening point of the composite modified sample becomes 4.0°C, and the softening point of the single polymer modified sample becomes 5.4°C. It can be seen that the softening point difference of the high viscosity modified asphalt sample after composite modification in Example 1 has a smaller change trend, which means that with the extension of storage time, it has higher product stability and is more advantageous in long-term logistics and transportation.

[0044] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A composite high-viscosity modified asphalt, characterized in that: The invention is composed of 100 parts of base asphalt, 2-15 parts of high molecular copolymer, 3-8 parts of petroleum resin modifier, 5-10 parts of auxiliary solvent, 0-5 parts of polyethylene, 0.1-0.4 parts of stabilizer and 0.2-0.5 parts of coupling agent by weight.

2. The composite high-viscosity modified asphalt according to claim 1, characterized in that: The base asphalt is No. 70 and / or No. 90 asphalt refined by mixing under normal and reduced pressure.

3. The composite high-viscosity modified asphalt according to claim 1, characterized in that: The high molecular polymer includes SBS and / or SEBS, wherein SBS is a linear structure with a molecular weight of 50,000-250,000, and SEBS is a low molecular weight linear SEBS with a styrene content of 34wt%, 35wt%, and 36wt%. If SBS and SEBS are included at the same time, the weight ratio of SBS to SEBS is 1:1-3:

1.

4. The composite high-viscosity modified asphalt according to claim 1, characterized in that: The petroleum resin is selected from one or a combination of C5 petroleum resin and C9 petroleum resin, has a molecular weight of 440-3000, a refractive index of 1.512, and a softening point of 100°C-140°C.

5. The composite high-viscosity modified asphalt according to claim 1, characterized in that: The co-solvent comprises one of aromatic oil, naphthenic distillate oil and furfural-reduced oil.

6. The composite high-viscosity modified asphalt according to claim 1, characterized in that: The polyethylene is low-density polyethylene or recycled waste material, and has a melt flow index of 2-30 g / 10 min.

7. The composite high-viscosity modified asphalt according to claim 1, characterized in that: The stabilizer is one or more of Runfeng Boyue stabilizer, Huatong stabilizer and Wasabi stabilizer.

8. The composite high-viscosity modified asphalt according to claim 1, characterized in that: The coupling agent is selected from one or both of siloxane coupling agents KH2560 and KH550.

9. A method for preparing the composite high-viscosity modified asphalt according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Prepare raw materials according to the set ratio; S2. Heat the base asphalt to 170-180°C at a stirring speed of 100-200 r / min until the asphalt is in a molten state, add the pre-weighed SBS and SEBS polymer blend into the reactor, increase the speed to 300 r / min, and stir for 1 hour after entering the pre-swelling stage; S3. After the pre-swelling is completed, the mixture is processed by a colloid mill at a speed of 3000 r / min for 30 minutes; S4, after the colloid mill treatment in step S3, add the weighed polyethylene and petroleum resin modifier to the mixture, stir evenly until the temperature is constant, add the cosolvent, stabilizer, and coupling agent, and carry out the medium swelling reaction under heating reflux conditions for 6-8 hours; S5. The mixture after the medium swelling reaction in step S4 is processed by a colloid mill at a rotation speed of 3000 r / min for 30-60 minutes to obtain a composite high-viscosity modified asphalt.

10. The method for preparing composite high-viscosity modified asphalt according to claim 9, characterized in that: After step S5, the prepared composite high-viscosity modified asphalt is subjected to performance tests, including viscosity, high and low temperature performance, viscosity-toughness performance, and aging performance, to verify whether it meets the set requirements.

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