High-performance high-viscosity modified asphalt and preparation method thereof

Abstract

The invention belongs to the technical field of asphalt, and particularly relates to high-performance and high-viscosity modified asphalt and a preparation method thereof.The high-viscosity modified asphalt contains less than 10 ppm of polycyclic aromatic hydrocarbon, less than 1 ppm of benzo (alpha) pyrene, less than 10 ppm of polycyclic aromatic hydrocarbon, less than 10 ppm of polycyclic aromatic hydrocarbon and less than 10 ppm of polycyclic aromatic hydrocarbon. The anti-aging asphalt comprises the following components in parts by weight: 100 parts of petroleum asphalt, 4-7 parts of SBS, 3-5 parts of SEBS, 1-4 parts of an anti-aging component A, 0.4-0.6 part of an anti-aging component B, 2-3 parts of a phase change material, 2-6 parts of a cosolvent and 0.2-0.4 part of a stabilizer, the petroleum asphalt is matrix asphalt refined by adopting mixed oil, and one kind of crude oil in the mixed oil is Middle East crude oil. The raw materials are simple in variety and not complex, industrial application is facilitated, the content of polycyclic aromatic hydrocarbon in the high-viscosity modified asphalt prepared through crude oil optimization is smaller than 10 ppm, the content of benzo (alpha) pyrene is smaller than 1 ppm, and the high-viscosity modified asphalt is very friendly to health of personnel in the production and application process.

Description

Technical Field

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

[0002] High-viscosity asphalt is generally asphalt with a dynamic viscosity of >20000Pa.s at 60℃, and is often used in the construction of drainage asphalt pavements and the maintenance of ultra-thin overlay roads. Because drainage asphalt pavements have large voids, they have excellent drainage, noise reduction, and anti-skid properties. However, this structural characteristic of large porosity also increases the contact area between asphalt and air and ultraviolet light, which accelerates the aging of asphalt and shortens the service life of the pavement. In addition, high-viscosity asphalt often adds a large amount of modified materials to increase its viscosity. During the production, mixing and use process, these large doses of modified materials often undergo degradation and other attenuation reactions under the action of heat, oxygen, ultraviolet light, etc., resulting in insufficient anti-aging performance of high-viscosity asphalt products and deterioration of other indicators of high-viscosity asphalt.

[0003] Patent 201710066696.1 discloses an anti-aging high-viscosity modified asphalt additive, which is prepared by high SBS, petroleum resin, aromatic oil, surface-modified mesoporous molecular sieve, and antioxidant. The patent mainly improves the anti-aging performance of asphalt through the synergistic effect of polysulfide groups and antioxidants on the surface-modified mesoporous molecular sieve. At the same time, this polysulfide group can also promote the cross-linking of additives and asphalt, and improve the compatibility of asphalt and modifiers. The anti-aging performance of this patent is mainly characterized by the penetration ratio and residual ductility after film aging. According to the index tests of various high-viscosity asphalts, the penetration ratio and ductility indicators of high-viscosity asphalts on the market are generally rich, but the softening point difference before and after aging is generally large, often >10°C. Therefore, to examine the aging resistance of high-viscosity asphalt, it is necessary to combine multiple indicators for comprehensive characterization. In addition, another important indicator of high-viscosity asphalt, viscosity-toughness and toughness, did not appear in the indicators examined. Insufficient toughness and viscosity-toughness of the asphalt binder will result in poor impact and scatter resistance of the road surface. After it is opened to traffic, there are common defects such as peeling and potholes, which affect the performance of the road surface.

[0004] Patent 202110944328.9 discloses a high-viscosity asphalt specially used for anti-aging maintenance and its preparation method. High-viscosity asphalt is prepared by high molecular polymer, stabilizer, petroleum resin, petroleum asphalt, and compatibilizer. The patent mainly improves the anti-aging performance by adding surfactants and anti-thermal oxidative aging additives. The viscosity and toughness indicators related to the anti-scattering of high-viscosity asphalt are not reflected in this patent, and the needle penetration ratio, which indicates its anti-aging performance, is not particularly excellent, and the needle penetration ratio is concentrated between 70% and 80%. In addition, from the perspective of production technology, the production process of this patent is relatively complicated, the production raw materials need to be added in batches, and the production temperature also needs to be repeatedly raised and lowered.

[0005] Patent 201710066705.7 discloses a high-viscosity asphalt additive that is resistant to UV aging. It is prepared by adding SBS, petroleum resin, aromatic oil, and organic-inorganic composite materials, wherein the organic-inorganic composite material is formed by the co-hydrolysis and polycondensation reaction of tetraethyl orthosilicate and an organic silane containing a triazinetrione group. The patent's anti-UV aging performance is provided by the organic-inorganic composite material, through the organic group's UV absorption, free radical capture, decomposition of hydroperoxides, etc., and the inorganic component has a strong shielding effect on UV rays. The two effects are coordinated with each other to greatly improve the anti-UV aging performance.

[0006] Patent 201911040860.7 discloses an anti-aging high-viscosity modified asphalt additive and its preparation method, which is prepared using SBS, petroleum resin, aromatic oil, stabilizer and coating, and anti-aging agent. The coating is surface-modified silica, which mainly improves the poor aging resistance of high-viscosity asphalt through the synergistic effect of the coating and the anti-aging agent.

[0007] Patent 202310260922.5 discloses an aging-resistant high-viscosity modified asphalt and its preparation method. It is prepared using petroleum asphalt, anti-aging components, high molecular polymers, viscosity-reducing components, stabilizers and co-solvents. The anti-aging performance of this patent is mainly provided by the addition of anti-aging agents, and the reduction in viscosity is mainly provided by the viscosity-reducing components. The viscosity at 175°C is still as high as nearly 1.0 Pa•s, which is still a big gap compared with the conventional ordinary modified asphalt with a viscosity of <3 Pa•s at 135°C. The viscosity-reducing effect is not outstanding, and there are still problems with poor construction and workability.

[0008] Patent 202210932039.1 discloses a high-viscosity modified asphalt and a preparation method thereof, which is prepared using petroleum asphalt, high molecular polymer, activated rubber powder, stabilizer and co-solvent. The patent provides a high-viscosity asphalt material with excellent comprehensive performance, but the viscosity at 175°C in its implementation case is basically close to 3Pa•s. Although its viscosity is lower than that of conventional rubber-modified asphalt, the viscosity is still too high during actual use, and the construction and workability are still not ideal.

[0009] In summary, firstly, the anti-aging performance of the existing products is characterized by a single method, which is characterized only by the penetration ratio and residual ductility, and cannot truly reflect its anti-aging performance. These indicators belong to the penetration grading system indicators, and the penetration grading system has the following problems: 1) The temperature range (15-135°C) for measuring the three major indicators is narrower than the temperature range of actual road asphalt application. 2) According to the current specifications, the road performance of asphalt of the same grade may vary greatly. Secondly, for the road paved with asphalt products, during use, little attention is paid to the release of polycyclic aromatic hydrocarbons due to friction with tires during production and use, especially high-viscosity modified asphalt, which is often used as the upper layer material of the road surface. The probability of contact with the human body is greatly increased compared with the middle and lower layers. Polycyclic aromatic hydrocarbons are carcinogens and have a certain impact on human health. Finally, while emphasizing the anti-aging performance, the existing patents pay less attention to other indicators of high-viscosity asphalt, and the indicator performance is not outstanding. Summary of the invention

[0010] The purpose of the present invention is to provide a high-viscosity asphalt product with excellent comprehensive performance, good aging resistance, construction and workability, so as to solve the following problems:

[0011] 1. The current high-viscosity asphalt has weak resistance to thermal oxidative aging and ultraviolet aging during production and use, resulting in severe aging.

[0012] 2. The current high-viscosity asphalt has high viscosity at high temperatures, resulting in poor construction and workability.

[0013] 3. The current high-viscosity asphalt has poor environmental performance.

[0014] At the same time, the technical solution also solves the problems of unstable storage of existing high-viscosity asphalt at high temperatures, which easily leads to phase separation of polymer and asphalt; the asphalt binder has insufficient viscosity and toughness, resulting in poor impact and scattering resistance of the road surface, and widespread defects such as peeling and potholes after opening to traffic, which affect the performance of the road surface; high-viscosity additives are expensive, resulting in a significant increase in material costs and difficulty in promotion, and the compatibility of additives with any asphalt may not be good, resulting in uneven final performance. In addition, the core components of other high-viscosity modified asphalts are often high-molecular polymers, and the amount added is large, which greatly increases the production cost.

[0015] To achieve the above objectives, this application is implemented through the following technical solutions:

[0016] A high-performance and high-viscosity modified asphalt, wherein the polycyclic aromatic hydrocarbons 15 items of the high-viscosity modified asphalt are less than 10ppm, and benzo(α)pyrene is less than 1ppm, and the high-viscosity modified asphalt is composed of the following components by weight:

[0017] 100 parts of petroleum asphalt;

[0018] SBS 4-7 parts;

[0019] SEBS 3-5 parts;

[0020] Anti-aging component A 1-4 parts;

[0021] Anti-aging component B 0.4-0.6 parts;

[0022] 2-3 parts of phase change material;

[0023] 2-6 parts of co-solvent;

[0024] Stabilizer 0.2-0.4 parts;

[0025] The petroleum asphalt is a base asphalt refined using mixed oil, and one of the crude oils in the mixed oil must be Middle Eastern crude oil, and the distillation temperature of No. 70 petroleum asphalt is not less than 490°C, and among the four components, the gum content is not less than 25%, the aromatic content is not less than 35%, the asphaltene content is between 8%-15%, and the saturated content is between 10%-20%.

[0026] Furthermore, the SBS is selected from one or more of Yueyang Petrochemical 791SBS, Yuhuang 7301SBS, and Dushanzi Petrochemical T161BSBS.

[0027] Furthermore, the SEBS is SEBS of different degrees of hydrogenation produced by Zhongli Technology, wherein the degree of hydrogenation is 40%-49%.

[0028] Furthermore, the anti-aging component A is nano-montmorillonite, and the anti-aging component B is a hindered phenol antioxidant, which is one or a combination of antioxidant 1010 or antioxidant 246.

[0029] Furthermore, the phase change material is polyethylene wax with a molecular weight of 6000.

[0030] Furthermore, the co-solvent is one or more of Mantek extender, Furunda aromatic oil, and line reduction oil.

[0031] Furthermore, the stabilizer is one or both of Boyue stabilizer or Zhongquan protection stabilizer.

[0032] A high-performance and high-viscosity modified asphalt is prepared by heating the base asphalt to 170-180°C, adding a solvent, SBS, and SEBS, and then adding nano-montmorillonite after high-speed shearing with a shearing machine for a period of time, and then adding a stabilizer, and then adding a phase change component after low-speed development at 175-185°C for a period of time, and stirring for a period of time.

[0033] The beneficial effects of the present invention are:

[0034] 1. The raw material varieties of the present invention are simple and uncomplicated, which is convenient for industrial application. Moreover, through crude oil optimization, the polycyclic aromatic hydrocarbon content of the prepared high-viscosity modified asphalt is less than 10 ppm, and the benzopyrene content is less than 1 ppm, which is very friendly to the health of personnel in the production and application process.

[0035] 2. The present invention significantly improves the anti-aging performance of high-viscosity asphalt through the effective and reasonable combination of various components. The anti-aging performance indicators of high-viscosity asphalt after thermal oxidation aging: needle penetration ratio, residual ductility, and PG grade change are all significantly improved.

[0036] 3. In addition to good anti-aging properties, the present invention also has good performance in other key indicators related to high-viscosity asphalt performance. It is a high-viscosity modified asphalt with excellent comprehensive performance, especially the viscosity index has been well improved, and it has very excellent construction and workability. DETAILED DESCRIPTION

[0037] 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.

[0038] The key to this technical solution is that the 15 polycyclic aromatic hydrocarbons of the prepared high-viscosity modified asphalt are less than 10ppm, and benzo(α)pyrene is less than 1ppm. Through repeated tests, it is found that this application can only be achieved when the petroleum asphalt used in this application is a base asphalt refined with mixed oil, and one of the crude oils in the mixed oil must be Middle Eastern crude oil, and the distillation temperature of No. 70 petroleum asphalt is not less than 490°C, and among the four components, the gum content is not less than 25%, the aromatic content is not less than 35%, the asphaltene content is between 8%-15%, and the saturated content is between 10%-20%. This result cannot be achieved by using other components.

[0039] Example 1

[0040] Heat 100 parts of No. 70 base asphalt to 180°C, add 4 parts of Mantek extender, 6 parts of Yueyang Petrochemical 791SBS, and 3 parts of SEBS with a hydrogenation degree of 49%, use a shearing machine to high-speed shear at 5000rpm for 10 minutes, slowly add 3 parts of DK4 nano-montmorillonite, continue shearing for 30 minutes, then stop shearing, transfer to normal stirring, add 0.3 parts of Boyue stabilizer and 0.6 parts of antioxidant 1010, stir and develop at 600rpm for 3.5 hours, add 2.3 parts of polyethylene wax, and continue stirring and developing for 0.5 hours.

[0041] Example 2

[0042] Heat 100 parts of No. 70 base asphalt to 180°C, add 6 parts of Furunda aromatic oil, 4 parts of Yuhuang 7301SBS, and 5 parts of SEBS with a hydrogenation degree of 40%, use a shearing machine to high-speed shear at 5000rpm for 10 minutes, slowly add 1 part of DK3 nano-montmorillonite, continue shearing for 30 minutes, then stop shearing, transfer to normal stirring, add 0.35 parts of Zhongquan protective stabilizer and 0.4 parts of antioxidant 246, stir and develop at 600rpm for 3.5 hours, add 3 parts of polyethylene wax, and continue stirring and developing for 0.5 hours.

[0043] Example 3

[0044] Heat 100 parts of No. 70 base asphalt to 180℃, add 3 parts of reduced three-line wax oil, 5 parts of Dushanzi Petrochemical T161BSBS, and 4 parts of SEBS with a hydrogenation degree of 40%, use a shearing machine to high-speed shear at 5000rpm for 10 minutes, slowly add 2 parts of DK4 nano-montmorillonite, continue shearing for 30 minutes, then stop shearing, transfer to normal stirring, add 0.3 parts of Boyue stabilizer and 0.5 parts of antioxidant 1010, stir and develop at 600rpm for 3.5 hours, add 2 parts of polyethylene wax, and continue stirring and developing for 0.5 hours.

[0045] Comparative Example 1

[0046] Heat 100 parts of No. 70 base asphalt (South American Marui base asphalt single refining, cutting temperature 450℃) to 180℃, add 4 parts of Mantek extender, 6 parts of Yueyang Petrochemical 791SBS, and 3 parts of SEBS with a hydrogenation degree of 49%, use a shearing machine to high-speed shear at 5000rpm for 10 minutes, slowly add 3 parts of DK4 nano-montmorillonite, continue shearing for 30 minutes, then stop shearing, transfer to normal stirring, add 0.3 parts of Boyue stabilizer and 0.6 parts of antioxidant 1010, and stir at 600rpm for 4.0h.

[0047] Comparative Example 2

[0048] Heat 100 parts of No. 70 base asphalt (South American Marui base asphalt single refining, cutting temperature 450℃) to 180℃, add 4 parts of Mantek extender and 9 parts of Yueyang Petrochemical 791SBS, use a shearing machine to high-speed shear at 5000rpm for 40min, transfer to normal stirring, add 0.3 parts of Boyue stabilizer, and stir at 600rpm for 4.0h.

[0049] Table 1. Test results of different implementation cases and comparison cases

[0050]

[0051] As can be seen from the above table, firstly, the high-viscosity modified asphalt prepared by using suitable crude oil varieties and distillation temperatures has 15 items of polycyclic aromatic hydrocarbons and less than 10ppm, and benzo(α)pyrene is less than 1ppm, which meets the requirements of EU REACH regulations. However, when using inappropriate crude oil varieties and distillation temperatures, the content of polycyclic aromatic hydrocarbons and benzo(α)pyrene is high. As we all know, polycyclic aromatic hydrocarbons and benzo(α)pyrene are carcinogens, which are not conducive to the health of personnel in production, construction and use projects. Secondly, by adding phase change materials, the low-temperature 60°C dynamic viscosity of Examples 1, 2, and 3 is significantly improved, which is beneficial to the grip of asphalt on aggregates, while the high-temperature 135°C and 175°C are significantly reduced, which is beneficial to construction and workability, and has little effect on other indicators. Furthermore, the anti-aging performance of the high-viscosity modified asphalt is characterized by the change degree of elongation after aging, needle penetration ratio and rutting factor (G*sinα) before and after aging. The anti-aging performance is characterized by both the needle penetration system and the performance grading system indicators, which is more comprehensive and can better reflect the anti-aging performance of the asphalt during actual use. It can be seen from the table that the high-viscosity modified asphalt prepared in Examples 1, 2 and 3 has a small change in high temperature grade before and after aging, and has better anti-aging performance.

[0052] 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-performance and high-viscosity modified asphalt, characterized in that: The high viscosity modified asphalt contains 15 items of polycyclic aromatic hydrocarbons and less than 10ppm, and benzo(α)pyrene is less than 1ppm. It is composed of the following components by weight: 100 parts of petroleum asphalt; SBS 4-7 parts; SEBS 3-5 parts; Anti-aging component A 1-4 parts; Anti-aging component B 0.4-0.6 parts; 2-3 parts of phase change material; 2-6 parts of co-solvent; Stabilizer 0.2-0.4 parts; The petroleum asphalt is a base asphalt refined using mixed oil, and one of the crude oils in the mixed oil must be Middle Eastern crude oil, and the distillation temperature of No. 70 petroleum asphalt is not less than 490°C, and among the four components, the gum content is not less than 25%, the aromatic content is not less than 35%, the asphaltene content is between 8%-15%, and the saturated content is between 10%-20%.

2. The high performance and high viscosity modified asphalt according to claim 1, characterized in that: SBS is selected from one or more of Yueyang Petrochemical 791SBS, Yuhuang 7301SBS, and Dushanzi Petrochemical T161BSBS.

3. The high performance and high viscosity modified asphalt according to claim 1, characterized in that: SEBS refers to SEBS with different degrees of hydrogenation produced by Zhongli Technology, with the degree of hydrogenation ranging from 40% to 49%.

4. The high performance and high viscosity modified asphalt according to claim 1, characterized in that: The anti-aging component A is nano-montmorillonite, and the anti-aging component B is a hindered phenol antioxidant, which is one or a combination of antioxidant 1010 or antioxidant 246.

5. The high performance and high viscosity modified asphalt according to claim 1, characterized in that: The phase change material is polyethylene wax with a molecular weight of 6000.

6. The high performance and high viscosity modified asphalt according to claim 1, characterized in that: The co-solvent is one or more of Mantek extender, Furunda aromatic oil and line reduction oil.

7. The high performance and high viscosity modified asphalt according to claim 1, characterized in that: The stabilizer is one or both of Boyue stabilizer and Zhongquan protective stabilizer.

8. A method for preparing the high-performance and high-viscosity modified asphalt according to any one of claims 1 to 7, characterized in that: The base asphalt is heated to 170-180°C, a co-solvent, SBS and SEBS are added, nano-montmorillonite is added after high-speed shearing with a shearing machine for a period of time, and then a stabilizer is added. After a period of low-speed development at 175-185°C, a phase change component is added, and the mixture is prepared after stirring for a period of time.

Images