Cooling and odor-removing high-effect asphalt modifier as well as preparation method and application thereof
By using materials such as carbon nanotubes modified with cationic surfactant and tourmaline negative ion powder modified with silane coupling agent in asphalt modifiers, the problems of deformation and rutting diseases of asphalt pavement in high temperature environments are solved, and the emission of toxic gases is reduced, which significantly improves the cooling and odor clean performance of asphalt pavement.
Patent Information
- Application Number
- CN202411808717.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-04-11
AI Technical Summary
The existing asphalt pavement is prone to deformation and rut diseases in high temperature environments in summer. At the same time, the asphalt mixture will release a large amount of toxic and harmful gases during high temperature mixing and construction, polluting the environment and endangering the health of construction workers.
A cooling and odor-cleaning high-performance asphalt modifier is used. The modifier consists of carbon nanotubes modified by cationic surfactant, tourmaline negative ion powder modified by silane coupling agent, and sugar alcohol. Through the use of the modifier, the asphalt flue gas emission can be significantly reduced, and the temperature can be reduced on the road surface, reducing the occurrence of rut diseases.
This modifier can effectively reduce asphalt flue gas emissions, reduce pavement temperature, reduce rutting diseases caused by high temperatures in summer, and significantly improve the performance and construction environment of asphalt pavement.
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of road construction materials, and in particular relates to a high-performance asphalt modifier capable of reducing temperature and removing odor, and a preparation method and application thereof. Background Art
[0002] Asphalt pavement has become the main structural form of high-grade pavement in my country due to its advantages such as smooth and continuous surface, smooth and low noise driving, early opening to traffic, and easy maintenance. Asphalt, as the most commonly used material in highways, is a viscoelastic and plastic organic polymer material. Its performance is very sensitive to temperature changes. As the temperature rises, its ability to resist deformation decreases significantly. Especially under the dual effects of high temperature environment and heavy traffic in summer, asphalt pavement is prone to deformation, resulting in rutting, congestion and other diseases. In addition, during the high-temperature mixing, transportation and paving process of asphalt mixture, a large amount of toxic and harmful gases will be released, polluting the environment and endangering the health of construction workers.
[0003] Regarding pavement cooling technology, according to different cooling principles, it can be divided into thermal resistance pavement, phase change temperature control pavement, evaporative pavement and heat reflective pavement. Among them, the first three technologies are aimed at processing the heat entering the interior of the pavement, which is a passive cooling method, while the heat reflective pavement actively adjusts the reflectivity of the mixture to reduce the heat absorption of the pavement structure. There are two main types of pavement heat reflection technology applications: one is coating technology, and the other is to improve the reflectivity by modifying the asphalt mixture. Although the use of coating technology has a significant effect on pavement cooling in summer, the reflective coating will reduce the pavement's anti-skid performance, and its wear resistance and durability are also problems that limit the promotion and application of coatings.
[0004] There are two main types of research on smoke suppression and odor removal of asphalt mixtures. One is to reduce the mixing temperature of the mixture. This technology can extend the construction season, save fuel, and reduce the emission of harmful gases, but warm-mix asphalt mixtures are expensive and have poor water stability. The other is to add smoke suppression modifiers to the mixture. By adding a certain modifier, the release of asphalt smoke can be significantly reduced while ensuring road performance, and it can play a role in odor removal. However, these modifiers have some inherent defects, such as the production of new toxic substances or poor stability.
[0005] In summary, the current research on asphalt pavement cooling and odor reduction has problems such as single material function, large dosage, and unclear effect. Therefore, there is an urgent need for a high-performance asphalt modifier that is simple to prepare, efficient, and has no side effects. Summary of the invention
[0006] In order to solve the above problems, the present invention provides a high-efficiency asphalt modifier with cooling and odor removal. The preparation conditions of the modifier are simple, and it can effectively reduce the road surface temperature and alleviate the impact of road rutting diseases. At the same time, it can absorb and purify some toxic gases generated by asphalt mixtures.
[0007] A high-performance asphalt modifier for reducing temperature and removing odor, characterized in that it comprises the following raw materials measured by mass ratio: Cationic surfactant-modified carbon nanotubes (CNTs) 0.9-1.2 parts; Silane coupling agent modified tourmaline anion powder (TAP) 10-13 parts; 17~20 parts of sugar alcohol.
[0008] Preferably, the cationic surfactant is dodecyltrimethylammonium bromide (DTAB), tetradecyltrimethylammonium bromide (TTAB) or hexadecyltrimethylammonium bromide (HTAB).
[0009] Furthermore, the cationic surfactant is dodecyltrimethylammonium bromide.
[0010] Preferably, carbon nanotubes (CNT) are added to a cationic surfactant solution at a mass ratio of 1:20, ultrasonically dispersed for 45 min, the ultrasonic treatment power is 400-500 W, then filtered, washed with water, and dried at 100°C.
[0011] Preferably, tourmaline anion powder (TAP) is added to the silane coupling agent solution at a mass ratio of 1:16, magnetically stirred for 1 hour at a stirring speed of 800-1000 rpm, then filtered, washed with water, and dried at 80°C.
[0012] Preferably, the carbon nanotube (CNT) is a single-walled carbon nanotube or a multi-walled carbon nanotube.
[0013] Furthermore, the carbon nanotubes (CNTs) are multi-walled carbon nanotubes. Preferably, the carbon nanotube (CNT) has a diameter of 12-200 nm and a length of 0.5-15 μm.
[0014] Furthermore, the carbon nanotube (CNT) has a diameter of 80-150 nm and a length of 0.5-5 μm.
[0015] Preferably, the particle size of the tourmaline anion powder (TAP) is 20-80 mesh.
[0016] Furthermore, the particle size of the tourmaline anion powder (TAP) is 80 meshes.
[0017] Preferably, the sugar alcohol is sorbitol, xylitol or isomalt.
[0018] Furthermore, the particle size of the sugar alcohol is 50-70 mesh.
[0019] Furthermore, the sugar alcohol is sorbitol.
[0020] The second aspect of the present invention provides a method for preparing a high-performance asphalt modifier for reducing temperature and removing odor, comprising the following steps: (1) adding carbon nanotubes (CNT) modified by cationic surfactant, tourmaline anion powder (TAP) modified by silane coupling agent and sugar alcohol into an ethanol solution according to a certain proportion, stirring for two hours, and drying in an oven at 80°C; (2) Add the dry mixed material into an extrusion granulator for granulation, with a particle size of 1 mm; (3) The obtained granules are ground in a planetary ball mill at 450 rpm for one hour to obtain a powder with a particle size of less than 40 μm, which is a high-performance asphalt modifier.
[0021] The third aspect of the present invention provides an application of a high-performance asphalt modifier for cooling and removing odor, characterized in that the high-performance asphalt modifier for cooling and removing odor is used for asphalt mixture; the mass fraction of the high-performance asphalt modifier for cooling and removing odor is 9 to 11% of the asphalt.
[0022] Compared with the prior art, the present invention has the following beneficial effects: the mixture with the addition of the asphalt modifier can significantly reduce the emission of asphalt fume under the action of the carbon nanotubes (CNT) modified by the cationic surfactant and the tourmaline anion powder (TAP) modified by the silane coupling agent, play a odor-removing role in the construction process, and reduce the emission of asphalt fume by more than 29% compared with the ordinary asphalt mixture; under the action of the tourmaline anion powder (TAP) modified by the silane coupling agent and the sugar alcohol, the road surface temperature can be significantly reduced by 7-9°C, reducing the asphalt road surface rutting and other diseases caused by high temperature in summer. DETAILED DESCRIPTION
[0023] The following will be combined with 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 making creative work are within the scope of protection of the present invention.
[0024] In addition, unless otherwise stated, all raw materials used were commercially available. Example
[0025] Example 1 provides a high-performance asphalt modifier for cooling and removing odor, which comprises the following raw materials, measured by mass ratio: 1 part of carbon nanotubes (CNT) modified with a cationic surfactant, 10 parts of tourmaline anion powder (TAP) modified with a silane coupling agent, and 17 parts of xylitol.
[0026] Among them, the carbon nanotube (CNT) is a multi-walled structure with a tube diameter of 12~200 nm and a length of 0.5~15 μm, and the cationic surfactant is hexadecyltrimethylammonium bromide.
[0027] Carbon nanotubes (CNTs) were added to the cationic surfactant solution at a mass ratio of 1:20, ultrasonically dispersed for 45 min at a power of 400 W, then filtered, washed with water, and dried at 100 °C.
[0028] Tourmaline anion powder (TAP) with a particle size of 80 mesh was added to the silane coupling agent solution at a mass ratio of 1:16, and magnetic stirring was performed for 1 hour at a stirring speed of 800 rpm, and then filtered, washed with water, and dried at 80°C.
[0029] Preparation method: (1) Add carbon nanotubes (CNT) modified with cationic surfactant, tourmaline anion powder (TAP) modified with silane coupling agent and xylitol in proportion to an ethanol solution with a mass fraction of 72 parts, stir for two hours, and dry in an oven at 80°C; (2) Add the dry mixture to an extrusion granulator for granulation, and the particle size is 1 mm; (3) Grind the obtained granules in a planetary ball mill at 450 rpm for one hour, and finally obtain a powder with a particle size of less than 40 μm, which is a high-efficiency asphalt modifier. Example
[0030] Example 2 provides a high-performance asphalt modifier for cooling and removing odor, which comprises the following raw materials, measured in mass proportions: 1 part of carbon nanotubes (CNT) modified with a cationic surfactant, 13 parts of tourmaline anion powder (TAP) modified with a silane coupling agent, and 20 parts of sorbitol.
[0031] Among them, the carbon nanotube (CNT) is a multi-walled structure with a tube diameter of 12~200 nm and a length of 0.5~15 μm, and the cationic surfactant is dodecyltrimethylammonium bromide.
[0032] Carbon nanotubes (CNTs) were added to the cationic surfactant solution at a mass ratio of 1:20, ultrasonically dispersed for 45 min at a power of 500 W, then filtered, washed with water, and dried at 100 °C.
[0033] Tourmaline anion powder (TAP) with a particle size of 20 mesh was added to the silane coupling agent solution at a mass ratio of 1:16, and magnetic stirring was performed for 1 hour at a stirring speed of 1000 rpm, and then filtered, washed with water, and dried at 80°C.
[0034] Preparation method: (1) Add carbon nanotubes (CNT) modified with cationic surfactant, tourmaline anion powder (TAP) modified with silane coupling agent and sorbitol in proportion to a 66 parts by mass ethanol solution, stir for two hours, and dry in an oven at 80°C; (2) Add the dry mixture to an extrusion granulator for granulation, with a particle size of 1 mm; (3) Grind the obtained granules in a planetary ball mill at 450 rpm for one hour, and finally obtain a powder with a particle size of less than 40 μm, which is a high-efficiency asphalt modifier. Example
[0035] Example 3 provides a high-performance asphalt modifier for cooling and removing odor, which comprises the following raw materials, measured in mass proportions: 0.5 parts of carbon nanotubes (CNTs) modified with cationic surfactants, 13 parts of tourmaline anion powder (TAP) modified with silane coupling agents, and 17 parts of sorbitol.
[0036] Among them, the carbon nanotube (CNT) is a multi-walled structure with a tube diameter of 12~200 nm and a length of 0.5~15 μm, and the cationic surfactant is dodecyltrimethylammonium bromide.
[0037] Carbon nanotubes (CNTs) were added to the cationic surfactant solution at a mass ratio of 1:20, ultrasonically dispersed for 45 min at a power of 400 W, then filtered, washed with water, and dried at 100 °C.
[0038] Tourmaline anion powder (TAP) with a particle size of 40 mesh was added to the silane coupling agent solution at a mass ratio of 1:16, and magnetic stirring was performed for 1 hour at a stirring speed of 900 rpm, and then filtered, washed with water, and dried at 80°C.
[0039] Preparation method: (1) Add carbon nanotubes (CNT) modified with cationic surfactant, tourmaline anion powder (TAP) modified with silane coupling agent and sorbitol in proportion to 69.5 parts by mass of ethanol solution, stir for two hours, and dry in an oven at 80°C; (2) Add the dry mixture to an extrusion granulator for granulation, with a particle size of 1 mm; (3) Grind the obtained granules in a planetary ball mill at 450 rpm for one hour, and finally obtain a powder with a particle size of less than 40 μm, which is a high-efficiency asphalt modifier. Example
[0040] The high-performance asphalt modifier for cooling and odor removal described in Example 1 was used to prepare AC-13 asphalt mixture, and the optimal oil-stone ratio was determined to be 4.87%. The mass fraction of the high-performance asphalt modifier for cooling and odor removal was 9% of the asphalt.
[0041] The preparation method of the asphalt mixture is as follows: the aggregate is heated to 155°C, and then the base asphalt at a temperature of 165°C is added, and then the cooling and odor-free high-performance asphalt modifier is quickly and evenly spread on the asphalt surface, mixed for 90 seconds, and finally the mineral powder is added and stirred again for 90 seconds. The modified asphalt mixture can be obtained through the molding process. Example
[0042] The high-performance asphalt modifier for cooling and odor removal described in Example 2 was used to prepare AC-13 asphalt mixture, and the optimal oil-stone ratio was determined to be 4.7%. The mass fraction of the high-performance asphalt modifier for cooling and odor removal was 10% of the asphalt.
[0043] The preparation method of the asphalt mixture is as follows: the aggregate is heated to 160°C, and then the base asphalt at a temperature of 165°C is added, and then the cooling and odor-free high-performance asphalt modifier is quickly and evenly spread on the asphalt surface, mixed for 90 seconds, and finally the mineral powder is added and stirred again for 90 seconds. The modified asphalt mixture can be obtained through the molding process. Example
[0044] The high-performance asphalt modifier for cooling and odor removal described in Example 3 was used to prepare AC-13 asphalt mixture, and the optimal oil-stone ratio was determined to be 4.9%. The mass fraction of the high-performance asphalt modifier for cooling and odor removal was 10% of the asphalt.
[0045] The preparation method of the asphalt mixture is as follows: the aggregate is heated to 160°C, and then the base asphalt at a temperature of 165°C is added, and then the cooling and odor-free high-performance asphalt modifier is quickly and evenly spread on the asphalt surface, mixed for 90 seconds, and finally the mineral powder is added and stirred again for 90 seconds. The modified asphalt mixture can be obtained through the molding process.
[0046] Comparative Example 1 AC-13 asphalt mixture was prepared, and the optimal asphalt-to-stone ratio was determined to be 4.9%, without adding high-performance asphalt modifier.
[0047] The preparation method of the asphalt mixture is: heating the aggregate to 160°C, adding the base asphalt at a temperature of 165°C, stirring for 90 seconds, and finally adding the mineral powder and stirring again for 90 seconds. After the molding process, the modified asphalt mixture can be obtained.
[0048] In order to verify the odor-free effect of the asphalt modifier provided by the present invention, a smoke density test was carried out during the asphalt mixture mixing process with reference to the relevant provisions of the "Test Method for Smoke Density Grade of Combustion or Decomposition of Building Materials" (GB-T8627). The specific experimental data are shown in Table 1.
[0049] Table 1 shows the asphalt smoke test results Detection items Example 4 Example 5 Example 6 Comparative Example <![CDATA[Asphalt fume concentration (mg / m 3 )]]> 151.6 177.3 162.5 251.7 Decrease (%) 39.7% 29.5% 33.4% - In order to verify the heat-resistant effect of the asphalt modifier provided by the present invention, referring to the relevant provisions of the "Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), rutting plates with a size of 30 cm*30 cm*5 cm mixed with the asphalt modifiers of Examples 1 to 3 and the comparative asphalt mixture were prepared respectively, a heating plate and a thermocouple were placed on the top of the rutting plate, and a thermocouple was placed on the bottom. After heating to 60°C and then keeping warm for 4 hours, the top and bottom temperatures of the rutting plate were tested to simulate the temperature change of the asphalt pavement. The specific experimental data are shown in Table 2.
[0050] Table 2 shows the test results of the temperature change of the rutting plate temperature Example 4 Example 5 Example 6 Comparative Example Top surface temperature (℃) 58.8 57.7 58.1 59.7 Bottom surface temperature (℃) 51.1 48.5 49.8 54.5 Top-bottom temperature difference (℃) 7.7 9.2 8.3 5.2 The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.
[0051] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.
Claims
1. A high-performance asphalt modifier for cooling and removing odor, characterized in that: Measured by mass ratio, including the following raw materials: Cationic surfactant-modified carbon nanotubes (CNTs) 0.9-1.2 parts; Silane coupling agent modified tourmaline anion powder (TAP) 10-13 parts; 17~20 parts of sugar alcohol.
2. The high-performance asphalt modifier for cooling and removing odor according to claim 1, characterized in that: The cationic surfactant is dodecyltrimethylammonium bromide (DTAB), tetradecyltrimethylammonium bromide (TTAB) or hexadecyltrimethylammonium bromide (HTAB).
3. The high-performance asphalt modifier for reducing temperature and removing odor according to claim 1, characterized in that: The carbon nanotubes (CNT) are added to a cationic surfactant solution at a mass ratio of 1:20, and ultrasonically dispersed for 45 minutes at a power of 400-500 W. The solution is then filtered, washed with water, and dried at 100°C.
4. The high-performance asphalt modifier for reducing temperature and removing odor according to claim 1, characterized in that: The tourmaline anion powder (TAP) is added to the silane coupling agent solution at a mass ratio of 1:16, and magnetically stirred for 1 hour at a stirring speed of 800-1000 rpm, then filtered, washed with water, and dried at 80°C.
5. The high-performance asphalt modifier for reducing temperature and removing odor according to claim 1, characterized in that: The carbon nanotube (CNT) is a single-walled carbon nanotube or a multi-walled carbon nanotube.
6. The high-performance asphalt modifier for reducing temperature and removing odor according to claim 1, characterized in that: The diameter of the carbon nanotube (CNT) is 12-200 nm, and the length is 0.5-15 μm.
7. The high-performance asphalt modifier for reducing temperature and removing odor according to claim 1, characterized in that: The particle size of the tourmaline anion powder (TAP) is 20-80 meshes.
8. The high-performance asphalt modifier for reducing temperature and removing odor according to claim 1, characterized in that: The sugar alcohol is sorbitol, xylitol or isomalt; the particle size of the sugar alcohol is 50-70 meshes.
9. A method for preparing a high-performance asphalt modifier for reducing temperature and removing odor according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) adding carbon nanotubes (CNT) modified by cationic surfactant, tourmaline anion powder (TAP) modified by silane coupling agent and sugar alcohol into an ethanol solution according to a certain proportion, stirring for two hours, and drying in an oven at 80°C; (2) Add the dry mixed material into an extrusion granulator for granulation, with a particle size of 1 mm; (3) The obtained granules are ground in a planetary ball mill at 450 rpm for one hour to obtain a powder with a particle size of less than 40 μm, which is a high-performance asphalt modifier.
10. An application of the high-performance asphalt modifier for reducing temperature and removing odor according to any one of claims 1 to 8, characterized in that: The high-efficiency asphalt modifier for cooling and removing odor is used for asphalt mixture; the mass fraction of the asphalt modifier for cooling and removing odor is 9-11%.