High-modulus additive, preparation method and application thereof and asphalt mixture
By developing a combination of high-modulus additives, including SEBS, PE, cycloane oil, PP wax and antioxidants, and mixing with asphalt and mineral powder, the existing modified asphalt additives have poor compatibility and complex preparation processes have been solved, and the high strength and aging resistance of the asphalt mixture has been achieved, simplified the construction process and reduced costs.
Patent Information
- Application Number
- CN202411826539.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-04-11
AI Technical Summary
The existing modified asphalt additives are poorly compatible in asphalt mixtures, difficult to disperse evenly, and the preparation process is complicated, resulting in increased construction difficulty and high cost.
A high modulus additive, including a combination of SEBS, PE, cycloane oil, PP wax and antioxidants, was developed, and mixed with asphalt and mineral powder by a simple preparation method to form an ultra-high strength asphalt mixture.
It significantly improves the rut resistance, waterproof damage and aging resistance of asphalt mixture, simplifies the construction process, reduces costs and improves the quality of the project.
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of road engineering, and in particular relates to a high modulus additive, a preparation method and application thereof, and an asphalt mixture. Background Art
[0002] Asphalt pavement has become the preferred pavement type in highway construction due to its smoothness, seamlessness, comfortable ride, low noise and easy maintenance. However, with the increase in vehicle speed, traffic volume and the increase in the proportion of heavy-loaded and even super-heavy-loaded vehicles, asphalt pavement has suffered serious damage, manifested in problems such as rutting, cracks, spalling and potholes. Rutting is particularly prominent, which seriously affects the performance of the road. The root cause of these problems is the lack of high temperature resistance and anti-aging properties of the asphalt material itself.
[0003] In order to improve the performance of asphalt and meet the engineering quality standards, engineers have developed a variety of modified asphalts to meet different engineering needs by means of blending and adding admixtures. Although the application of modified asphalt has significantly improved the performance of the road surface, the current modified additives still have the problem of poor compatibility with asphalt and are difficult to disperse evenly in the asphalt mixture. At the same time, the diversity of additive raw materials and the complexity of the preparation process also bring challenges to construction.
[0004] In view of this, there is an urgent need to develop a new type of high modulus additive for the preparation of asphalt mixtures. This high modulus additive not only has excellent performance, but also has a simple preparation process, can effectively simplify the construction process, and significantly reduce the cost of modified asphalt, thereby achieving a dual improvement in economic benefits and construction efficiency. Summary of the invention
[0005] In view of the above technical problems, the purpose of the present invention is to provide a high modulus additive, its preparation method and application, and asphalt mixture. The asphalt mixture after adding the high modulus additive significantly improves its anti-rutting performance, water damage resistance and aging resistance. The asphalt mixture is very suitable for key occasions such as pavement paving in tunnels, paving operations on steel bridge decks, heavy-loaded traffic roads, and construction of airport runways, ensuring the long-term stability and safe use of these important infrastructures.
[0006] In order to achieve the above object, the technical solution adopted by the present invention is:
[0007] A high modulus additive comprises the following components in weight proportion: SEBS: PE: naphthenic oil: PP wax: antioxidant = (40-50): (20-30): (10-20): (10-20): (1-3).
[0008] The present invention also provides a preparation method based on the above-mentioned high modulus additive, wherein the weight proportions of SEBS are mixed with cyclohexane oil for oil extension, and after the oil extension is completed, PE, PP wax and antioxidant are added and stirred evenly to obtain the high modulus additive.
[0009] In some technical solutions, the preparation method further comprises: placing the high modulus additive in a twin-screw for extrusion granulation to obtain pellets.
[0010] The present invention also provides an application of a high modulus additive. According to the above-mentioned high modulus additive, or the above-mentioned method for preparing the high modulus additive, it is applied to prepare asphalt mixture and mixed with asphalt and mineral powder.
[0011] In some technical solutions, the step of preparing the asphalt mixture includes: putting the high modulus additive into a mixing tank for dry mixing for a period of time, and then adding asphalt and mineral powder for wet mixing to obtain an ultra-high strength asphalt mixture.
[0012] In some technical solutions, the high modulus additive accounts for 0.3% to 0.7% of the ultra-high strength asphalt mixture.
[0013] In some technical solutions, the dry mixing time is greater than or equal to 20 seconds.
[0014] In some technical solutions, the wet mixing time is greater than or equal to 50s.
[0015] In some technical solutions, before the high modulus additive is added into the mixing tank, the method further includes: heating the gravel in the mixing plant to 190-200°C.
[0016] The present invention also provides an asphalt mixture, wherein the asphalt mixture contains the high modulus additive.
[0017] The present invention adopts the above technical solution to have at least the following beneficial effects:
[0018] 1. The high modulus additive provided by the present invention is a direct-injection modifier formed by mixing SEBS, PE and PP wax. After addition, a lubricating polymer chain structure is formed inside the binder, which greatly improves the anti-rutting ability of the asphalt mixture. Thanks to the addition of PP wax, the fluidity of the overall binder is improved, thereby optimizing the compaction performance and ensuring that the road surface has higher strength; compared with SBS mixture, SEBS mixture shows more excellent high temperature resistance and anti-rutting ability, water damage performance and anti-aging properties. The asphalt mixture added with the high modulus additive is particularly suitable for high-demand occasions such as tunnel pavement, steel bridge deck paving, heavy-load traffic roads and airport runways, ensuring the durability and efficient operation of these key infrastructures;
[0019] 2. The high modulus additive provided by the present invention has a simple and efficient preparation process and supports a continuous production process. This feature greatly promotes its application and promotion in actual production, ensuring the improvement of production efficiency and effective control of costs. DETAILED DESCRIPTION
[0020] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope limited by the appended claims of the present application. The various commonly used reagents used in the examples are all commercially available products.
[0021] Example 1
[0022] The invention provides a high modulus additive, comprising the following components in weight proportion: SEBS: PE: naphthenic oil: PP wax: antioxidant = (40-50): (20-30): (10-20): (10-20): (1-3).
[0023] The above-mentioned SEBS (hydrogenated styrene-butadiene block copolymer) is a linear triblock copolymer with polystyrene as the terminal segment and ethylene-butene copolymer obtained by hydrogenating polybutadiene as the middle elastic block.
[0024] Example 2
[0025] Based on Example 1, the present invention also provides a method for preparing the high modulus additive, comprising the steps of:
[0026] The SEBS and naphthenic oil are mixed and extended with the oil in parts by weight. After the oil extension is completed, PE, PP wax and antioxidant are added and stirred evenly to obtain a high modulus additive.
[0027] Furthermore, the preparation step also includes: placing the high modulus additive in a twin-screw for extrusion granulation to obtain pellets of the high modulus additive.
[0028] Example 3
[0029] On the basis of Example 1 and Example 2, the present invention also provides the application of the high modulus additive, which is applied to the preparation of asphalt mixture and mixed with asphalt and mineral powder.
[0030] In some embodiments, the above-mentioned step of preparing the asphalt mixture includes: adding the high modulus additive into a mixing tank for dry mixing for a period of time, and then adding asphalt and mineral powder for wet mixing to obtain an ultra-high strength asphalt mixture.
[0031] Furthermore, the ratio of the high modulus additive to the asphalt mixture is 0.3% to 0.7%.
[0032] Furthermore, the dry mixing time is greater than or equal to 20S.
[0033] Furthermore, the wet mixing time is greater than or equal to 50S.
[0034] Furthermore, before the high modulus additive is added into the mixing tank, the step of preparing the asphalt mixture also includes: heating the gravel in the mixing plant to 190-200°C.
[0035] Example 4
[0036] Based on Examples 1-3, the present invention further provides an asphalt mixture, which contains the above-mentioned high modulus additive.
[0037] The preparation steps of the asphalt mixture are:
[0038] The gravel in the mixing plant is heated to 190-200°C, 0.3%-0.7% of high modulus additives are added to the mixing tank for dry mixing for more than 20 seconds, and then asphalt and mineral powder are added for wet mixing for more than 50 seconds to obtain an ultra-high strength asphalt mixture.
[0039] The asphalt mixture can be used in the construction of tunnel pavement, steel bridge deck paving, heavy-load roads or airport runways.
[0040] The high modulus additive provided by the present invention and its preparation method and application are described below in conjunction with specific embodiments.
[0041] Example 5
[0042] The high modulus additive comprises the following components in weight proportions:
[0043] SEBS: PE: cyclohexane oil: PP wax: antioxidant = 40: 20: 10: 10: 1.
[0044] The above-mentioned SEBS in parts by weight is mixed with cyclohexane oil for oil extension. After the oil extension is completed, PE, PP wax and antioxidant are added and stirred evenly to obtain a high modulus additive.
[0045] The high modulus additive is then placed in a twin-screw extruder for extrusion granulation to obtain pellets of the high modulus additive.
[0046] When using this high modulus additive to prepare asphalt mixture, first heat the gravel in the mixing plant to 190-200°C, then put 0.3% of the high modulus additive into the mixing tank and dry mix for more than 20 seconds, then add asphalt and mineral powder and wet mix for more than 50 seconds to obtain an ultra-high strength asphalt mixture.
[0047] Example 6
[0048] The high modulus additive comprises the following components in weight proportions:
[0049] SEBS: PE: cyclohexane oil: PP wax: antioxidant = 50: 30: 20: 20: 3.
[0050] The above-mentioned SEBS in parts by weight is mixed with cyclohexane oil for oil extension. After the oil extension is completed, PE, PP wax and antioxidant are added and stirred evenly to obtain a high modulus additive.
[0051] The high modulus additive is then placed in a twin-screw extruder for extrusion granulation to obtain pellets of the high modulus additive.
[0052] When using this high modulus additive to prepare asphalt mixture, first heat the gravel in the mixing plant to 190-200°C, then put 0.7% of the high modulus additive into the mixing tank and dry mix for more than 20 seconds, then add asphalt and mineral powder and wet mix for more than 50 seconds to obtain an ultra-high strength asphalt mixture.
[0053] Example 7
[0054] The high modulus additive comprises the following components in weight proportions:
[0055] SEBS: PE: cyclohexane oil: PP wax: antioxidant = 45: 25: 15: 15: 2.
[0056] The above-mentioned SEBS in parts by weight is mixed with cyclohexane oil for oil extension. After the oil extension is completed, PE, PP wax and antioxidant are added and stirred evenly to obtain a high modulus additive.
[0057] The high modulus additive is then placed in a twin-screw extruder for extrusion granulation to obtain pellets of the high modulus additive.
[0058] When using this high modulus additive to prepare asphalt mixture, first heat the gravel in the mixing plant to 190-200°C, then put 0.5% of the high modulus additive into the mixing tank and dry mix for more than 20 seconds, then add asphalt and mineral powder and wet mix for more than 50 seconds to obtain an ultra-high strength asphalt mixture.
[0059] Example 8
[0060] The high modulus additive comprises the following components in weight proportions:
[0061] SEBS: PE: cyclohexane oil: PP wax: antioxidant = 45: 20: 15: 12: 2.
[0062] The above-mentioned SEBS in parts by weight is mixed with cyclohexane oil for oil extension. After the oil extension is completed, PE, PP wax and antioxidant are added and stirred evenly to obtain a high modulus additive.
[0063] The high modulus additive is then placed in a twin-screw extruder for extrusion granulation to obtain pellets of the high modulus additive.
[0064] When using this high modulus additive to prepare asphalt mixture, first heat the gravel in the mixing plant to 190-200°C, then put 0.3% of the high modulus additive into the mixing tank and dry mix for more than 20 seconds, then add asphalt and mineral powder and wet mix for more than 50 seconds to obtain an ultra-high strength asphalt mixture.
[0065] Example 9
[0066] The high modulus additive comprises the following components in weight proportions:
[0067] SEBS: PE: cyclohexane oil: PP wax: antioxidant = 48: 26: 14: 17: 3.
[0068] The above-mentioned SEBS in parts by weight is mixed with cyclohexane oil for oil extension. After the oil extension is completed, PE, PP wax and antioxidant are added and stirred evenly to obtain a high modulus additive.
[0069] The high modulus additive is then placed in a twin-screw extruder for extrusion granulation to obtain pellets of the high modulus additive.
[0070] When using this high modulus additive to prepare asphalt mixture, first heat the gravel in the mixing plant to 190-200°C, then put 0.6% of the high modulus additive into the mixing tank and dry mix for more than 20 seconds, then add asphalt and mineral powder and wet mix for more than 50 seconds to obtain an ultra-high strength asphalt mixture.
[0071] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.
Claims
1. A high modulus additive, characterized in that The invention comprises the following components in the following weight ratio: SEBS: PE: naphthenic oil: PP wax: antioxidant = (40-50): (20-30): (10-20): (10-20): (1-3).
2. The method for preparing the high modulus additive according to claim 1, characterized in that: The SEBS in the weight proportion is mixed with cyclohexane oil for oil extension. After the oil extension is completed, PE, PP wax and antioxidant are added and stirred evenly to obtain the high modulus additive.
3. The preparation method according to claim 2, characterized in that: Also includes: The high modulus additive is placed in a twin-screw extruder for extrusion granulation to obtain pellets.
4. An application of a high modulus additive, characterized in that: The high modulus additive according to claim 1, or the preparation method of the high modulus additive according to claims 2-3, is used in the preparation of asphalt mixture and is mixed with asphalt and mineral powder.
5. The use according to claim 4, characterized in that: The step of preparing the asphalt mixture comprises: putting the high modulus additive into a mixing tank for dry mixing for a period of time, and then adding asphalt and mineral powder for wet mixing to obtain the asphalt mixture with ultra-high strength.
6. The use according to claim 5, characterized in that: The high modulus additive accounts for 0.3% to 0.7% of the asphalt mixture.
7. The use according to claim 5, characterized in that: The dry mixing time is greater than or equal to 20S.
8. The use according to claim 5, characterized in that: The wet mixing time is greater than or equal to 50S.
9. The use according to claim 5, characterized in that: Before the high modulus additive is added to the mixing tank, the method further comprises: Heat the stones in the mixing plant to 190-200℃.
10. An asphalt mixture, characterized in that: The asphalt mixture contains the high modulus additive according to claim 1 or any one of claims 2-3.