An in-situ non-temperature-destroying regeneration agent for asphalt pavement and preparation method thereof

Abstract

The present invention relates to the technical field of warm regeneration of asphalt pavement, and in particular to an in-situ non-destructive temperature regeneration agent for asphalt pavement and a preparation method thereof. The following steps are included: preparation of a mobile dispersant; activation and modification of acetylene black; compounding of aromatic oil, SBS and microwave sensitive materials. Styrene-butadiene-styrene block copolymer and aromatic oil are first compounded to obtain an aromatic oil / SBS type regeneration agent, and then stearic acid amide is added. The in-situ non-destructive temperature regeneration agent for asphalt pavement obtained after compounding has high electrolyte stability, storage stability and mechanical stability, and the activated and surface-modified nano-scale microwave sensitive material acetylene black powder is added, so that the in-situ non-destructive temperature regeneration agent for asphalt pavement can obtain a better softening and regeneration effect of the original asphalt pavement under the microwave-assisted action without affecting the performance of the in-situ non-destructive temperature regeneration agent for asphalt pavement.

Description

Technical Field

[0001] The invention relates to the technical field of warm regeneration of asphalt pavement, and in particular to an in-situ non-destructive temperature regeneration agent for asphalt pavement and a preparation method thereof. Background Art

[0002] Under the background of "dual carbon", how to recycle and turn waste asphalt mixtures generated during the operation and maintenance period into treasure, and reduce environmental pollution and resource waste has become a hot topic of social concern and research. Asphalt pavement recycling technology has received more and more attention from all walks of life in the industry.

[0003] At present, the main methods of asphalt pavement regeneration in my country are on-site or factory-mixed hot regeneration and cold regeneration. Although the waste asphalt mixture treated by hot regeneration technology can be comparable to the performance of ordinary hot-mix asphalt mixture, the amount of waste asphalt mixture is usually only 20%~30%, and the production and construction temperature requirements are high, the energy consumption is large, and the traditional heating method not only causes secondary aging of asphalt in the waste asphalt mixture, but also produces a large amount of CO2, SO2, NO in the hot regeneration process. x and other toxic and harmful gases; although cold recycling technology can achieve 100% utilization of waste asphalt mixtures, cold recycled mixtures are mainly used for the base, subbase or lower layers of low-grade roads or high-grade roads, and cold recycled mixtures have significant problems such as long curing time, poor water stability and durability. Against this background, warm mix recycling technology for waste asphalt mixtures came into being. Warm mix recycling technology usually refers to a new type of asphalt mixture recycling technology that uses technical means to reduce the mixing temperature of asphalt mixtures by more than 30~40℃ under the premise of basically maintaining the asphalt mixture ratio and construction process, but the performance reaches that of hot mix asphalt mixtures. The core of this technology is to use warm mix regeneration agents to reduce the mixing temperature of waste asphalt mixtures.

[0004] The warm mix recycling technology for waste asphalt mixtures still has technical bottlenecks such as being only applicable to plant-mixed recycling, high cost of warm mix regeneration agents, destruction of the original road surface mineral material gradation when the waste asphalt mixture is milled and recycled, and high energy consumption of traditional heating methods. Unlike traditional heating methods such as thermal radiation and heat conduction, microwave heating technology can achieve simultaneous heating inside and outside the object and uniform heating. It is a new type of heating technology that is fast, green, and can achieve selective heating. It can significantly reduce the secondary aging of asphalt in waste asphalt mixtures. However, the exploration and research on existing microwave heating technology mainly focuses on the field of plant-mixed hot recycling of waste asphalt mixtures, and has not involved the field of on-site recycling of asphalt pavements. In addition, relevant research on existing microwave plant-mixed hot recycling technology has shown that conventional waste asphalt mixtures have poor microwave sensitivity and it is difficult to reach the temperature required for softening and regeneration in a short time under microwave irradiation. Summary of the invention

[0005] In order to solve the above technical defects, the present invention combines warm mix regeneration technology and microwave heating technology to develop a method for preparing an in-situ non-destructive temperature regeneration agent for asphalt pavement. The prepared in-situ non-destructive temperature regeneration agent has good physical properties and high storage stability, and has a good effect of softening and regenerating original asphalt pavement under the assistance of microwaves.

[0006] A method for preparing an in-situ non-temperature-destroying regeneration agent for an asphalt pavement comprises the following steps:

[0007] S1: Preparation of mobile dispersants

[0008] Dissolving methyl nadic anhydride, vinyl acetate and N,N-dimethylaminoethyl methacrylate in toluene under a nitrogen atmosphere to obtain a pre-reaction solution, then heating the pre-reaction solution, adding an initiator to react, rotating and drying, and grinding to obtain a flowable dispersant;

[0009] S2: Activation and modification of acetylene black

[0010] Plasma treatment is performed on acetylene carbon black powder to obtain activated acetylene carbon black powder, and then the activated acetylene carbon black powder is ultrasonically dispersed in deionized water, dodecyltrimethylammonium chloride is added to perform heating and stirring treatment, and after centrifugal filtration, the powder is washed and dried to obtain surface-modified acetylene carbon black powder;

[0011] S3: Compound of aromatic oil, SBS and microwave sensitive materials

[0012] The aromatic oil is placed in a high-speed shearing machine, and styrene-butadiene-styrene block copolymer is added while high-speed shearing is performed. After heat preservation and melting, an aromatic oil / SBS type regeneration agent is obtained. A flow dispersant and surface-modified acetylene carbon black powder are added to the aromatic oil / SBS type regeneration agent, and stearic acid amide is added after high-speed shearing. High-speed shearing is continued to obtain an in-situ non-temperature-destructive regeneration agent for asphalt pavement.

[0013] Furthermore, the preparation of the mobile dispersant in step S1 comprises the following steps:

[0014] S1.1: Nadic methyl anhydride, vinyl acetate and N,N-dimethylaminoethyl methacrylate are placed in a container at a molar ratio of 1:(6-8):(8-10), and 3-5 times the mass of toluene is added to obtain a mixture, nitrogen is introduced into the mixture for 30-35 minutes, and then stirring is continued under a nitrogen atmosphere until the nadic methyl anhydride, vinyl acetate and N,N-dimethylaminoethyl methacrylate are completely dissolved to obtain a pre-reaction solution;

[0015] S1.2: Place the pre-reaction solution in a flask equipped with a condensing device, heat it to 100-105°C, then add 0.8-1wt% of the initiator, stir evenly and react at a constant temperature for 5-6 hours to obtain a reaction solution, place the reaction solution in a rotary evaporator and evaporate it at 45-50°C for 4-5 hours, then place it in a vacuum drying oven and dry it at 80-85°C, then grind it into powder, pass it through a 200-220 mesh sieve, and obtain a flowable dispersant.

[0016] Further, step S2, activation and modification of acetylene black, comprises the following steps:

[0017] S2.1: Place the acetylene carbon black powder in an oven and heat it at 45-50°C for 8-10 minutes. Then place it in a plasma treatment machine while it is still hot and adjust the vacuum degree to 10 -3 -10 -2 Pa, the plasma flow rate is 150-180sccm, and the processing power is 240-260W for 8-10 minutes to obtain activated acetylene carbon black powder;

[0018] S2.2: Place activated acetylene carbon black powder and deionized water in an ultrasonic disperser at a mass ratio of 1: (20-25), perform ultrasonic dispersion at a frequency of 25-30kHz for 5-8 minutes, then add 2-5wt% of dodecyltrimethylammonium chloride, stir at 75-80°C for 4-6 hours, then place in a centrifuge for centrifugal separation at a speed of 2500-3000r / min, filter out the solid matter, rinse with deionized water, rinse until the pH of the deionized water is neutral, and then dry to obtain surface modified acetylene carbon black powder.

[0019] Furthermore, step S3 of compounding the aromatic oil, SBS and microwave sensitive material comprises the following steps:

[0020] S3.1: Place 100-120 parts of aromatic oil in a high-speed shearing machine, adjust the shearing speed to 2000-2200r / min, the temperature to 80-85°C, maintain high-speed shearing, and then slowly add 30-40 parts of styrene-butadiene-styrene block copolymer to the aromatic oil. After all the addition, stop shearing, maintain the temperature of 80-85°C for melting and development for 4-5 hours, and obtain an aromatic oil / SBS type regeneration agent;

[0021] S3.2: Add 2.5-3wt% of flow dispersant and 3-3.2wt% of surface modified acetylene black powder to the aromatic oil / SBS type regeneration agent prepared in step S3.1, and perform high-speed shearing at a shear rate of 2000-2200r / min at 50-55°C for 15-20 minutes. Then add 20-30 parts of stearic acid amide and continue high-speed shearing for 10-12 minutes to obtain an in-situ non-destructive temperature regeneration agent for asphalt pavement.

[0022] Furthermore, the initiator in step S1.2 is AIBN or benzoyl peroxide.

[0023] Furthermore, the time for slowly adding the styrene-butadiene-styrene block copolymer into the aromatic oil in step S3.1 is 25-30 minutes.

[0024] An in-situ non-temperature-loss regeneration agent for asphalt pavement is prepared by the preparation method of the in-situ non-temperature-loss regeneration agent for asphalt pavement.

[0025] The beneficial effects are as follows: 1. The present invention firstly compounded styrene-butadiene-styrene block copolymer and aromatic oil to obtain an aromatic oil / SBS type regeneration agent, and then added stearic acid amide for high-speed shearing to obtain an emulsion. Stearic acid amide can not only effectively improve the high-temperature performance of asphalt, but also has little effect on the low-temperature performance of asphalt, and has a good viscosity reduction effect from 90°C in the low-temperature zone to 170°C in the high-temperature zone, and has a low cost. The asphalt pavement in-situ non-destructive temperature regeneration agent obtained after compounding with the aromatic oil / SBS type regeneration agent has good physical properties and high storage stability. In addition, activated and surface-modified nano-scale microwave-sensitive material acetylene carbon black powder is added, and the addition amount is controlled to be 2.5-3wt%. Under the premise of not affecting the performance of the in-situ non-destructive temperature regeneration agent for the asphalt pavement, it can obtain a better softening and regenerating effect of the original asphalt pavement under the assistance of microwaves.

[0026] The invention prepares a mobile dispersant by dissolving methyl nadic anhydride, vinyl acetate and N,N-dimethylaminoethyl methacrylate in toluene under a nitrogen atmosphere and performing a temperature-raising reaction. The mobile dispersant can prevent the substances from agglomerating easily, thereby improving the electrolyte stability, storage stability and mechanical stability of an in-situ non-destructive temperature regeneration agent for an asphalt pavement. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a flow chart of the method for preparing the in-situ non-temperature-destructive regeneration agent for asphalt pavement used in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings 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.

[0029] Example 1: An in-situ non-temperature-destroying regeneration agent for asphalt pavement and a preparation method thereof, such as Figure 1 As shown, the following steps are included:

[0030] S1: Preparation of mobile dispersants

[0031] S1.1: Nadic methyl anhydride, vinyl acetate and N, N-dimethylaminoethyl methacrylate are placed in a container at a molar ratio of 1:6:8, and 3 times the mass of toluene is added to obtain a mixture, and nitrogen is introduced into the mixture for 30 minutes, and then stirred continuously under a nitrogen atmosphere until the Nadic methyl anhydride, vinyl acetate and N, N-dimethylaminoethyl methacrylate are completely dissolved to obtain a pre-reaction solution;

[0032] S1.2: Place the pre-reaction solution in a flask equipped with a condensing device, heat it to 100°C, then add 0.8wt% AIBN, stir evenly and react at a constant temperature for 5 hours to obtain a reaction solution, place the reaction solution in a rotary evaporator and evaporate it at 45°C for 4 hours, then place it in a vacuum drying oven and dry it at 80°C, then grind it into powder, pass it through a 200-mesh sieve, and obtain a flowable dispersant.

[0033] S2: Activation and modification of acetylene black

[0034] S2.1: Place the acetylene carbon black powder in an oven and heat it at 45°C for 8 minutes. Then, place it in a plasma treatment machine while it is still hot and adjust the vacuum degree to 10 -3 Pa, the plasma flow rate is 150sccm, and the treatment power is 240W for 8 minutes to obtain activated acetylene carbon black powder;

[0035] S2.2: Place activated acetylene black powder and deionized water in an ultrasonic disperser at a mass ratio of 1:20, perform ultrasonic dispersion at a frequency of 25 kHz for 5 minutes, then add 2 wt% of dodecyltrimethylammonium chloride, stir at 75°C for 4 hours, then place in a centrifuge for centrifugal separation at a speed of 2500 r / min, filter out the solid substance, rinse it with deionized water, rinse until the pH of the deionized water is neutral, and then dry it to obtain surface modified acetylene black powder.

[0036] S3: Compound of aromatic oil, SBS and microwave sensitive materials

[0037] S3.1: Place 100 parts of aromatic oil in a high-speed shearing machine, adjust the shearing speed to 2000r / min, the temperature to 80°C, maintain high-speed shearing, and then slowly add 30 parts of styrene-butadiene-styrene block copolymer to the aromatic oil within 25 minutes. After all the addition, stop shearing, maintain the temperature of 80°C for molten development for 4 hours, and obtain an aromatic oil / SBS type regeneration agent;

[0038] S3.2: Add 2.5 wt% of flow dispersant and 3 wt% of surface modified acetylene black powder to the aromatic oil / SBS type regeneration agent prepared in step S3.1, and perform high-speed shearing at a shear rate of 2000 r / min at 50°C for 15 minutes. Then add 20 parts of stearic acid amide and continue high-speed shearing for 10 minutes to obtain an in-situ non-destructive temperature regeneration agent for asphalt pavement.

[0039] Example 2: An in-situ non-temperature-destroying regeneration agent for asphalt pavement and a preparation method thereof, such as Figure 1 As shown, the following steps are included:

[0040] S1: Preparation of mobile dispersants

[0041] S1.1: Nadic methyl anhydride, vinyl acetate and N, N-dimethylaminoethyl methacrylate are placed in a container at a molar ratio of 1:8:10, and 5 times the mass of toluene is added to obtain a mixture, and nitrogen is introduced into the mixture for 30 minutes, and then stirred continuously under a nitrogen atmosphere until the Nadic methyl anhydride, vinyl acetate and N, N-dimethylaminoethyl methacrylate are completely dissolved to obtain a pre-reaction solution;

[0042] S1.2: Place the pre-reaction solution in a flask equipped with a condensing device, heat it to 100°C, then add 1wt% AIBN, stir evenly and react at a constant temperature for 5 hours to obtain a reaction solution, place the reaction solution in a rotary evaporator and evaporate it at 45°C for 4 hours, then place it in a vacuum drying oven and dry it at 80°C, then grind it into powder, pass it through a 200-mesh sieve, and obtain a flowable dispersant.

[0043] S2: Activation and modification of acetylene black

[0044] S2.1: Place the acetylene carbon black powder in an oven and heat it at 45°C for 8 minutes. Then, place it in a plasma treatment machine while it is still hot and adjust the vacuum degree to 10 -3 Pa, the plasma flow rate is 150sccm, and the treatment power is 240W for 8 minutes to obtain activated acetylene carbon black powder;

[0045] S2.2: Place activated acetylene carbon black powder and deionized water in an ultrasonic disperser at a mass ratio of 1:25, perform ultrasonic dispersion at a frequency of 25 kHz for 5 minutes, then add 5 wt% of dodecyltrimethylammonium chloride, stir at 75°C for 4 hours, then place in a centrifuge for centrifugal separation at a speed of 2500 r / min, filter out the solid substance, rinse it with deionized water, rinse until the pH of the deionized water is neutral, and then dry it to obtain surface modified acetylene carbon black powder.

[0046] S3: Compound of aromatic oil, SBS and microwave sensitive materials

[0047] S3.1: Place 120 parts of aromatic oil in a high-speed shearing machine, adjust the shearing speed to 2000r / min, the temperature to 80°C, maintain high-speed shearing, and then slowly add 40 parts of styrene-butadiene-styrene block copolymer to the aromatic oil within 25 minutes. After all the addition, stop shearing, maintain the temperature of 80°C for molten development for 4 hours, and obtain an aromatic oil / SBS type regeneration agent;

[0048] S3.2: Add 3 wt% of flow dispersant and 3.2 wt% of surface modified acetylene black powder to the aromatic oil / SBS type regeneration agent prepared in step S3.1, and perform high-speed shearing at a shear rate of 2000 r / min at 50°C for 15 minutes. Then add 30 parts of stearic acid amide and continue high-speed shearing for 10 minutes to obtain an in-situ non-destructive temperature regeneration agent for asphalt pavement.

[0049] Example 3: An in-situ non-temperature-destroying regeneration agent for asphalt pavement and a preparation method thereof, such as Figure 1 As shown, the following steps are included:

[0050] S1: Preparation of mobile dispersants

[0051] S1.1: Nadic methyl anhydride, vinyl acetate and N, N-dimethylaminoethyl methacrylate are placed in a container at a molar ratio of 1:6:8, and 3 times the mass of toluene is added to obtain a mixture, and nitrogen is introduced into the mixture for 35 minutes, and then stirred continuously under a nitrogen atmosphere until the nadic methyl anhydride, vinyl acetate and N, N-dimethylaminoethyl methacrylate are completely dissolved to obtain a pre-reaction solution;

[0052] S1.2: Place the pre-reaction solution in a flask equipped with a condensing device, heat it to 105°C, then add 0.8wt% AIBN, stir evenly and react at a constant temperature for 6 hours to obtain a reaction solution, place the reaction solution in a rotary evaporator and evaporate it at 50°C for 5 hours, then place it in a vacuum drying oven and dry it at 85°C, then grind it into powder, pass it through a 220-mesh sieve, and obtain a flowable dispersant.

[0053] S2: Activation and modification of acetylene black

[0054] S2.1: Place the acetylene carbon black powder in an oven and heat it at 50°C for 10 minutes. Then, place it in a plasma treatment machine while it is still hot and adjust the vacuum degree to 10 -2 Pa, the plasma flow rate is 180sccm, and the treatment power is 260W for 10 minutes to obtain activated acetylene carbon black powder;

[0055] S2.2: Place activated acetylene carbon black powder and deionized water in an ultrasonic disperser at a mass ratio of 1:20, perform ultrasonic dispersion at a frequency of 30 kHz for 8 minutes, then add 2 wt% of dodecyltrimethylammonium chloride, stir at 80°C for 6 hours, then place in a centrifuge for centrifugal separation at a speed of 3000 r / min, filter out the solid substance, rinse it with deionized water, rinse until the pH of the deionized water is neutral, and then dry it to obtain surface modified acetylene carbon black powder.

[0056] S3: Compound of aromatic oil, SBS and microwave sensitive materials

[0057] S3.1: Place 100 parts of aromatic oil in a high-speed shearing machine, adjust the shearing speed to 2200r / min, the temperature to 85°C, maintain high-speed shearing, and then slowly add 30 parts of styrene-butadiene-styrene block copolymer to the aromatic oil within 25 minutes. After all the addition, stop shearing, maintain the temperature of 85°C for melting and development for 5 hours, and obtain an aromatic oil / SBS type regeneration agent;

[0058] S3.2: Add 2.5 wt% of flow dispersant and 3 wt% of surface modified acetylene black powder to the aromatic oil / SBS type regeneration agent prepared in step S3.1, perform high-speed shearing at a shear rate of 2200 r / min at 55°C for 20 minutes, then add 20 parts of stearic acid amide and continue high-speed shearing for 12 minutes to obtain an in-situ non-destructive temperature regeneration agent for asphalt pavement.

[0059] Comparative Example 1: The difference between Comparative Example 1 and Example 1 is that in Comparative Example 1, the stearic acid amide in step S3.2 is replaced with an equal amount of CR-6 modified polyether type non-ionic surfactant, and the remaining steps are the same as Example 1 to prepare an in-situ non-temperature-destructive regeneration agent for asphalt pavement, which is recorded as Comparative Example 1.

[0060] Comparative Example 2: The difference between Comparative Example 2 and Example 1 is that in Comparative Example 2, the stearic acid amide in step S3.2 is replaced with an equal amount of kerosene, and the remaining steps are the same as Example 1 to prepare an in-situ non-temperature-destructive regeneration agent for asphalt pavement, which is recorded as Comparative Example 2.

[0061] Comparative Example 3: The difference between Comparative Example 3 and Example 1 is that Comparative Example 3 removes step S2 and does not add surface-modified acetylene carbon black powder in step S3.2. The remaining steps are the same as Example 1 to prepare an in-situ temperature-free regeneration agent for asphalt pavement, which is recorded as Comparative Example 3.

[0062] Comparative Example 4: The difference between Comparative Example 4 and Example 1 is that Comparative Example 4 removes step S1 and does not add a mobile dispersant in step S3.2. The remaining steps are the same as Example 1, and an in-situ non-temperature-destructive regeneration agent for asphalt pavement is obtained, which is recorded as Comparative Example 4.

[0063] Physical property test: In order to clarify the actual application conditions of the developed in-situ non-destructive temperature regeneration agent for asphalt pavement and its impact on the performance of asphalt mixture, the basic physical properties of the in-situ non-destructive temperature regeneration agent for asphalt pavement prepared in Examples 1-3 and Comparative Examples 1-4 were tested. The test results are shown in Table 1.

[0064] Table 1: Basic physical properties of in-situ non-temperature-depleting regeneration agent

[0065]

[0066] It can be seen from Table 1 that the physical properties of the asphalt pavement in-situ non-destructive temperature regeneration agent prepared in Examples 1-3 are better than those in Comparative Examples 1-4, the pH value thereof is close to neutral, and will not have an adverse effect on the performance of the asphalt mixture, and the demulsification temperature thereof is relatively high and the emulsion viscosity is moderate. Therefore, the developed in-situ non-destructive temperature regeneration agent has good practical application effect and excellent workability.

[0067] Storage stability test: The asphalt pavement in-situ non-destructive temperature regeneration agent prepared in Examples 1-3 and Comparative Examples 1-4 were injected into dark bottles and tightly covered. They were stored at room temperature for 240 h, 264 h, 288 h, and 312 h, respectively, and their viscosity changes were tested. The test results are shown in Table 2.

[0068] Table 2: Storage stability of in-situ non-temperature-degrading regeneration agent for asphalt pavement

[0069]

[0070] It can be seen from 2 that the storage stability of the in-situ non-temperature-destructive regeneration agent for asphalt pavement prepared in Examples 1-3 is better than that of Comparative Examples 1-4. The viscosity of the in-situ non-temperature-destructive regeneration agent prepared in the examples does not change much during storage. The test results show that the developed in-situ non-temperature-destructive regeneration agent has good storage stability and can meet conventional storage conditions.

[0071] Performance test of softened asphalt under microwave: Several AC-13 graded Marshall specimens were formed using limestone and SK-90 matrix asphalt. Equal masses of Examples 1-3 and Comparative Examples 1-4 were smeared on the upper surface of the Marshall specimens, and irradiated with microwaves at a power of 800 W. The changes in the Marshall specimens after 5 minutes of microwave exposure were tested. The test results are shown in Table 3.

[0072] Table 3: Softening performance of in-situ non-temperature-depleting regeneration agent

[0073]

[0074] It can be seen from Table 3 that the Marshall specimens without the regeneration agent and the Marshall specimens with the addition of comparative examples 1-4 are difficult to soften under long-term microwave irradiation; while the Marshall specimens coated with the asphalt pavement in-situ non-destructive temperature regeneration agent prepared in Examples 1-3 have a significant surface softening effect in a short time and a deep softening depth.

[0075] Test on the effect of regenerated asphalt pavement under microwave: The milled waste asphalt mixture was used to carry out the regeneration test of the full amount of waste asphalt mixture, that is, without adding any new aggregate and new asphalt, the waste asphalt mixture of Example 1 was added, and the addition amount was 8%. The mixture was irradiated with microwaves at a power of 800W for 5 minutes. The test results are shown in Table 4. The standard value is selected from the index requirements of general asphalt concrete in "humid, hot in summer and cold in winter areas".

[0076] It can be seen from Table 4 that the in-situ non-destructive temperature regeneration agent for asphalt pavement prepared in Example 1 can still ensure good temperature regeneration effect of the full amount of waste asphalt mixture after the gradation of the original ore material of the asphalt mixture is destroyed, and meet the regeneration demand of the waste asphalt mixture.

[0077] Table 4: Regeneration effect of in-situ non-temperature-depleting regeneration agent

[0078]

[0079] From all the above experiments, it can be seen that the asphalt pavement in-situ non-destructive temperature regeneration agent obtained by compounding stearic acid amide with aromatic oil / SBS type regeneration agent has good physical properties, high storage stability and thermal stability, and by adding activated and surface-modified nano-scale microwave-sensitive material acetylene carbon black powder, the addition amount is controlled to 2.5-3wt%, so that the asphalt pavement in-situ non-destructive temperature regeneration agent can obtain a better softening and regenerating effect of the original asphalt pavement under the assistance of microwaves without affecting the performance of the asphalt pavement.

[0080] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for preparing an in-situ non-temperature-destroying regeneration agent for asphalt pavement, characterized in that: The following steps are involved: S1: Preparation of mobile dispersants Dissolving methyl nadic anhydride, vinyl acetate and N,N-dimethylaminoethyl methacrylate in toluene under a nitrogen atmosphere to obtain a pre-reaction solution, then heating the pre-reaction solution, adding an initiator to react, rotating and drying, and grinding to obtain a flowable dispersant; S2: Activation and modification of acetylene black Plasma treatment is performed on acetylene carbon black powder to obtain activated acetylene carbon black, and then the activated acetylene carbon black is ultrasonically dispersed in deionized water, dodecyltrimethylammonium chloride is added to perform heating and stirring treatment, and after centrifugal filtration, the mixture is washed and dried to obtain surface-modified acetylene carbon black powder; S3: Compound of aromatic oil, SBS and microwave sensitive materials The aromatic oil is placed in a high-speed shearing machine, and styrene-butadiene-styrene block copolymer is added while performing high-speed shearing. After heat preservation and melting, an aromatic oil / SBS type regeneration agent is obtained. A flow dispersant and surface-modified acetylene carbon black powder are added to the aromatic oil / SBS type regeneration agent. After high-speed shearing, stearic acid amide is added, and high-speed shearing is continued to obtain an in-situ non-temperature-destructive regeneration agent for asphalt pavement. Step S1 specifically includes the following steps: S1.1: Nadic methyl anhydride, vinyl acetate and N,N-dimethylaminoethyl methacrylate are placed in a container at a molar ratio of 1:(6-8):(8-10), and 3-5 times the mass of toluene is added to obtain a mixture, nitrogen is introduced into the mixture for 30-35 minutes, and then stirring is continued under a nitrogen atmosphere until the nadic methyl anhydride, vinyl acetate and N,N-dimethylaminoethyl methacrylate are completely dissolved to obtain a pre-reaction solution; S1.2: Place the pre-reaction solution in a flask equipped with a condensing device, heat it to 100-105°C, then add 0.8-1wt% of an initiator, stir evenly and react at a constant temperature for 5-6 hours to obtain a reaction solution, place the reaction solution in a rotary evaporator at a temperature of 45-50°C for 4-5 hours, then place it in a vacuum drying oven at a temperature of 80-85°C for drying, then grind it into powder, pass it through a 200-220 mesh sieve, and obtain a mobile dispersant; Step S2 specifically includes the following steps: S2.1: Place the acetylene carbon black powder in an oven and heat it at 45-50°C for 8-10 minutes. Then place it in a plasma treatment machine while it is still hot and adjust the vacuum degree to 10 -3 -10 -2 Pa, the plasma flow rate is 150-180sccm, and the processing power is 240-260W for 8-10 minutes to obtain activated acetylene carbon black powder; S2.2: Activated acetylene carbon black powder and deionized water are placed in an ultrasonic disperser at a mass ratio of 1: (20-25), and ultrasonic dispersion is performed at a frequency of 25-30kHz for 5-8 minutes, and then 2-5wt% of dodecyltrimethylammonium chloride is added, and stirred at 75-80°C for 4-6 hours, and then placed in a centrifuge for centrifugal separation at a speed of 2500-3000r / min, and the solid matter is filtered out and rinsed with deionized water until the pH of the deionized water is neutral, and then dried to obtain surface-modified acetylene carbon black powder; Step S3 specifically includes the following steps: S3.1: Place 100-120 parts of aromatic oil in a high-speed shearing machine, adjust the shearing speed to 2000-2200r / min, the temperature to 80-85°C, maintain high-speed shearing, and then slowly add 30-40 parts of styrene-butadiene-styrene block copolymer to the aromatic oil. After all the addition, stop shearing, maintain the temperature of 80-85°C for melting and development for 4-5 hours, and obtain an aromatic oil / SBS type regeneration agent; S3.2: Add 2.5-3wt% of flow dispersant and 3-3.2wt% of surface modified acetylene black powder to the aromatic oil / SBS type regeneration agent prepared in step S3.1, and perform high-speed shearing at a shear rate of 2000-2200r / min at 50-55°C for 15-20 minutes. Then add 20-30 parts of stearic acid amide and continue high-speed shearing for 10-12 minutes to obtain an in-situ non-destructive temperature regeneration agent for asphalt pavement.

2. The method for preparing an in-situ non-temperature-destructive regeneration agent for asphalt pavement according to claim 1, characterized in that: The initiator in step S1.2 is AIBN or benzoyl peroxide.

3. The method for preparing an in-situ non-temperature-destructive regeneration agent for asphalt pavement according to claim 1, characterized in that: The time for slowly adding the styrene-butadiene-styrene block copolymer into the aromatic oil in step S3.1 is 25-30 minutes.

4. An in-situ non-temperature-destroying regeneration agent for asphalt pavement, characterized in that: The asphalt pavement in-situ non-temperature-destructive regeneration agent is prepared by the preparation method of any one of claims 1 to 3.

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