A method for modifying asphalt with ternary eutectic solvent desulfurized waste rubber powder

Abstract

The application discloses a method for modifying asphalt by using waste rubber powder treated by a ternary eutectic solvent, and belongs to the technical field of modified asphalt preparation.The application aims at solving the problem that there is no safe and fast desulfurization method to destroy the cross-linking structure of waste rubber powder, enhance the interaction between waste rubber powder and asphalt, and improve the storage stability of waste rubber powder modified asphalt.The method comprises the following steps: 1, preparation of a ternary eutectic solvent;2, desulfurization of waste rubber powder by using the ternary eutectic solvent;3, preparation of modified asphalt.The application can be used for modifying asphalt by using waste rubber powder treated by a ternary eutectic solvent.

Description

Technical Field

[0001] This invention belongs to the field of modified asphalt preparation technology. Background Technology

[0002] Globally, approximately 1.5 billion waste tires are generated annually, and this number continues to grow. Despite the development of various processing technologies, the overall resource utilization rate of waste tires remains low due to limitations in current process efficiency and cost. It is estimated that over 60% of waste tires are currently disposed of in landfills. These materials, due to their high calorific value (>30 MJ / kg), low thermal conductivity (approximately 0.14 W / m·K), and internal porosity that easily traps water, not only significantly increase the fire risk index (flash point >300℃) but also easily create a breeding ground for disease-carrying organisms, leading to serious secondary ecological pollution.

[0003] In the field of solid waste resource utilization, the application of waste tires in road engineering has formed a large-scale technological path. Waste rubber powder prepared by mechanical crushing can replace 10% to 20% of the base asphalt in the preparation of waste rubber powder modified asphalt. This technical route has dual environmental benefits: on the one hand, it reduces the consumption of non-renewable petroleum resources, and on the other hand, it improves the material recycling rate. Studies have shown that the incorporation of waste rubber powder can increase the fatigue life of asphalt mixtures by 35% to 50%, improve the rutting resistance of pavements by more than 40%, and significantly extend the service life of roads.

[0004] However, the inherent three-dimensional cross-linked network structure of waste rubber powder (mainly CS and SS bonds) results in weak interaction between it and the asphalt matrix, leading to significant phase separation during storage of waste rubber powder modified asphalt, which severely restricts its engineering application. Existing modification technologies are mainly divided into the following aspects: (1) Physical modification method: destroying the cross-linked structure through microwave radiation, but the electromagnetic induction discharge phenomenon caused by tire steel wire residue poses a safety hazard; (2) Microbial desulfurization method: utilizing the biological enzymatic hydrolysis of sulfur-loving bacteria, but there are technical bottlenecks such as long reaction cycle (>72h).

[0005] Therefore, exploring a safe and rapid desulfurization method has become a key research direction. Based on this desulfurization technology, the cross-linked structure of waste rubber powder is disrupted, the interaction between waste rubber powder and asphalt is enhanced, the storage stability of waste rubber powder-modified asphalt is improved, and the promotion of waste rubber powder-modified asphalt is facilitated. Summary of the Invention

[0006] The present invention aims to address the lack of a safe and rapid desulfurization method to disrupt the cross-linking structure of waste rubber powder, enhance the interaction between waste rubber powder and asphalt, and improve the storage stability of waste rubber powder modified asphalt. Therefore, it provides a method for desulfurizing waste rubber powder modified asphalt using a ternary eutectic solvent.

[0007] A method for modifying asphalt using ternary eutectic solvent-desulfurized waste rubber powder comprises the following steps:

[0008] I. Preparation of ternary eutectic solvents:

[0009] Choline chloride, zinc salt, and amide compound are mixed and then reacted under constant temperature and stirring conditions until the mixture becomes a clear solution, yielding a ternary eutectic solvent.

[0010] II. Ternary eutectic solvent desulfurization waste rubber powder:

[0011] Waste rubber powder was dispersed in a ternary eutectic solvent and then reacted under constant temperature and stirring conditions. After the reaction was completed, the mixture was washed and dried to obtain desulfurized waste rubber powder.

[0012] III. Preparation of Modified Asphalt:

[0013] The desulfurized waste rubber powder is sieved and added to the base asphalt. Then, under constant temperature and stirring conditions, the desulfurized waste rubber powder is evenly dispersed in the base asphalt. Finally, under constant temperature and shear conditions, the particle size of the desulfurized waste rubber powder is reduced to obtain ternary eutectic solvent-modified asphalt.

[0014] The beneficial effects of this invention are:

[0015] (1) The ternary eutectic solvent in this invention is obtained by blending choline chloride (hydrogen bond donor), an amide compound (hydrogen bond acceptor), and a zinc Lewis acid salt. The amino group (-NH2) of the amide compound acts as the hydrogen bond donor, transferring protons (H+) to the amide group. + ) provides chloride ions (Cl - ), forming NH···Cl - Hydrogen bonding. Zinc salts act as Lewis acids, where Zn... 2+ It can form coordinate bonds with carbonyl oxygen (C=O) or amino (NH2) in amide compounds, jointly destroying the original crystal structure of the system, resulting in a further decrease in melting point, which is beneficial for subsequent full contact with waste rubber powder and improves the desulfurization modification effect;

[0016] (2) In this invention, waste rubber powder is desulfurized and modified based on a ternary eutectic solvent. On the one hand, Zn 2+ As a Lewis acid, it coordinates with sulfur atoms in sulfur crosslinking bonds (such as SS and SC bonds), polarizing and weakening the bond energy, thus promoting the pyrolysis or oxidative breakage of sulfur bonds. On the other hand, under high-temperature conditions, the amide group can accelerate the reaction with the CS and SS bonds of waste rubber powder, leading to the breakage of crosslinking bonds. Through the combined effect of these two aspects, the crosslinking network structure of waste rubber powder is destroyed to the greatest extent, improving the compatibility of waste rubber powder with asphalt.

[0017] (3) In this invention, the waste rubber powder is desulfurized based on ternary eutectic solvent, which destroys the dense three-dimensional network structure of the waste rubber powder, enhances its interaction with asphalt, and promotes the swelling-degradation process of the waste rubber powder in asphalt. While ensuring the road performance of modified asphalt, it improves the stability of waste rubber powder in asphalt and solves the problem that waste rubber powder is prone to sinking during hot storage, causing equipment damage and a decline in the road performance of waste rubber powder modified asphalt. Attached Figure Description

[0018] Figure 1 The image shows the differential scanning calorimeter of the ternary eutectic solvent prepared in step one of Example 5. Detailed Implementation

[0019] Specific Implementation Method 1: This implementation method describes a method for modifying asphalt using ternary eutectic solvent-desulfurized waste rubber powder, which is carried out according to the following steps:

[0020] I. Preparation of ternary eutectic solvents:

[0021] Choline chloride, zinc salt, and amide compound are mixed and then reacted under constant temperature and stirring conditions until the mixture becomes a clear solution, yielding a ternary eutectic solvent.

[0022] II. Ternary eutectic solvent desulfurization waste rubber powder:

[0023] Waste rubber powder was dispersed in a ternary eutectic solvent and then reacted under constant temperature and stirring conditions. After the reaction was completed, the mixture was washed and dried to obtain desulfurized waste rubber powder.

[0024] III. Preparation of Modified Asphalt:

[0025] The desulfurized waste rubber powder is sieved and added to the base asphalt. Then, under constant temperature and stirring conditions, the desulfurized waste rubber powder is evenly dispersed in the base asphalt. Finally, under constant temperature and shear conditions, the particle size of the desulfurized waste rubber powder is reduced to obtain ternary eutectic solvent-modified asphalt.

[0026] In this specific embodiment, the melting point of the ternary eutectic solvent prepared in step one is 100°C to 300°C lower than that of the single-component choline chloride.

[0027] The beneficial effects of this embodiment are:

[0028] (1) The ternary eutectic solvent in this embodiment is obtained by blending choline chloride (hydrogen bond donor), an amide compound (hydrogen bond acceptor), and a zinc Lewis acid salt. The amino group (-NH2) of the amide compound acts as a hydrogen bond donor, transferring protons (H+) to the amide group. + ) provides chloride ions (Cl - ), forming NH···Cl - Hydrogen bonding. Zinc salts act as Lewis acids, where Zn... 2+It can form coordinate bonds with carbonyl oxygen (C=O) or amino (NH2) in amide compounds, jointly destroying the original crystal structure of the system, resulting in a further decrease in melting point, which is beneficial for subsequent full contact with waste rubber powder and improves the desulfurization modification effect;

[0029] (2) In this embodiment, waste rubber powder is desulfurized and modified using a ternary eutectic solvent. On the one hand, Zn 2+ As a Lewis acid, it coordinates with sulfur atoms in sulfur crosslinking bonds (such as SS and SC bonds), polarizing and weakening the bond energy, thus promoting the pyrolysis or oxidative breakage of sulfur bonds. On the other hand, under high-temperature conditions, the amide group can accelerate the reaction with the CS and SS bonds of waste rubber powder, leading to the breakage of crosslinking bonds. Through the combined effect of these two aspects, the crosslinking network structure of waste rubber powder is destroyed to the greatest extent, improving the compatibility of waste rubber powder with asphalt.

[0030] (3) In this embodiment, the waste rubber powder is desulfurized based on ternary eutectic solvent, which destroys the dense three-dimensional network structure of the waste rubber powder, enhances its interaction with asphalt, and promotes the swelling-degradation process of the waste rubber powder in asphalt. While ensuring the road performance of modified asphalt, it improves the stability of waste rubber powder in asphalt and solves the problem that waste rubber powder is prone to sinking during hot storage, causing equipment damage and a decline in the road performance of waste rubber powder modified asphalt.

[0031] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One in that the mass ratio of zinc salt to choline chloride in step one is 1:(1-40); and the mass ratio of choline chloride to amide compound in step one is 1:(1-20). Everything else is the same as in Specific Implementation Method One.

[0032] Specific Implementation Method Three: This implementation method differs from Specific Implementation Method One or Two in that the zinc salt mentioned in step one is zinc acetate, zinc chloride, zinc nitrate, zinc acetate, or zinc sulfate. Everything else is the same as in Specific Implementation Method One or Two.

[0033] Specific Implementation Method Four: This implementation method differs from Specific Implementation Methods One to Three in that the amide compound mentioned in step one is aminoformamide, urea, acetamide, formamide, or caprolactam. Everything else is the same as in Specific Implementation Method Three.

[0034] Specific Implementation Method Five: This implementation method differs from Specific Implementation Methods One to Four in that: in step one, the reaction is carried out at a constant temperature of 40℃ to 100℃ and a stirring speed of 20 r / min to 500 r / min for 1 h to 10 h until the mixture becomes a clear solution. Everything else is the same as in Specific Implementation Methods One to Four.

[0035] Specific Implementation Method Six: This implementation method differs from Specific Implementation Methods One to Five in that: the mass ratio of waste rubber powder to ternary eutectic solvent in step two is 1:(1-100); the particle size of the waste rubber powder in step two is 20 mesh to 200 mesh. Everything else is the same as in Specific Implementation Methods One to Five.

[0036] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Methods One to Six in that: in step two, the reaction is carried out at a constant temperature of 100℃~200℃ and a stirring speed of 1000r / min~2200r / min for 1h~6h. Everything else is the same as in Specific Implementation Methods One to Six.

[0037] Specific Implementation Method Eight: This implementation method differs from Specific Implementation Methods One to Seven in that the mass ratio of desulfurized waste rubber powder to base asphalt in the ternary eutectic solvent-modified asphalt described in step three is 1:(4-99). Everything else is the same as in Specific Implementation Methods One to Seven.

[0038] Specific Implementation Method Nine: This implementation method differs from Specific Implementation Methods One to Eight in that: in step three, ultrasonic vibration is used to pass the desulfurized waste rubber powder through a 20-80 mesh sieve before adding it to the base asphalt; in step three, the mixture is stirred for 1-3 hours at a constant temperature of 130℃-200℃ and a stirring speed of 500r / min-1000r / min until the desulfurized waste rubber powder is evenly dispersed in the base asphalt. Everything else is the same as in Specific Implementation Methods One to Eight.

[0039] Specific Implementation Method Ten: This implementation method differs from Specific Implementation Methods One to Nine in that: in step three, the shearing is performed for 1 to 3 hours at a constant temperature of 140℃ to 200℃ and a shearing speed of 2000 r / min to 8000 r / min to reduce the particle size of the desulfurization waste rubber powder. Everything else is the same as in Specific Implementation Methods One to Nine.

[0040] The beneficial effects of the present invention are verified using the following embodiments:

[0041] Example 1:

[0042] A method for modifying asphalt using ternary eutectic solvent-desulfurized waste rubber powder comprises the following steps:

[0043] I. Preparation of ternary eutectic solvents:

[0044] 10g of choline chloride, 10g of zinc salt and 20g of amide compound were mixed and then reacted for 10h at a constant temperature of 40℃ and a stirring speed of 100r / min. At this time, the mixture became a clear solution and a ternary eutectic solvent was obtained.

[0045] The zinc salt mentioned is zinc acetate;

[0046] The amide compound is aminoformamide;

[0047] II. Ternary eutectic solvent desulfurization waste rubber powder:

[0048] 10g of waste rubber powder was dispersed in 500g of ternary eutectic solvent, and then reacted for 2h at a constant temperature of 100℃ and a stirring speed of 1000r / min. After the reaction was completed, the mixture was washed with anhydrous ethanol and dried to obtain desulfurized waste rubber powder.

[0049] The average particle size of the waste adhesive powder is 254 μm;

[0050] III. Preparation of Modified Asphalt:

[0051] Using ultrasonic vibration at a frequency of 18 kHz, desulfurized waste rubber powder was vibrated for 10 minutes to pass through a 60-mesh sieve and then added to the base asphalt. The mixture was then stirred for 1 hour at a constant temperature of 140℃ and a stirring speed of 500 r / min to ensure that the desulfurized waste rubber powder was evenly dispersed in the base asphalt. Finally, the mixture was sheared for 1 hour at a constant temperature of 140℃ and a shearing speed of 2000 r / min to reduce the particle size of the desulfurized waste rubber powder, thus obtaining ternary eutectic solvent-modified asphalt.

[0052] The mass ratio of desulfurized waste rubber powder to base asphalt in the ternary eutectic solvent desulfurized waste rubber powder modified asphalt is 10:90.

[0053] The base asphalt is No. 90 Liaohe Petrochemical asphalt.

[0054] Example 2:

[0055] A method for modifying asphalt using ternary eutectic solvent-desulfurized waste rubber powder comprises the following steps:

[0056] I. Preparation of ternary eutectic solvents:

[0057] 40g of choline chloride, 20g of zinc salt and 200g of amide compound were mixed and then reacted at a constant temperature of 60℃ and a stirring speed of 200r / min for 8h. At this time, the mixture became a clear solution and a ternary eutectic solvent was obtained.

[0058] The zinc salt mentioned is zinc nitrate;

[0059] The amide compound is acetamide;

[0060] II. Ternary eutectic solvent desulfurization waste rubber powder:

[0061] 15g of waste rubber powder was dispersed in 950g of ternary eutectic solvent, and then reacted for 3h at a constant temperature of 120℃ and a stirring speed of 1200r / min. After the reaction was completed, the mixture was washed with anhydrous ethanol and dried to obtain desulfurized waste rubber powder.

[0062] The average particle size of the waste adhesive powder is 254 μm;

[0063] III. Preparation of Modified Asphalt:

[0064] Using ultrasonic vibration at a frequency of 18 kHz, desulfurized waste rubber powder was vibrated for 20 minutes to pass through a 60-mesh sieve before being added to the base asphalt. Then, it was stirred for 1.5 hours at a constant temperature of 145℃ and a stirring speed of 600 r / min to ensure that the desulfurized waste rubber powder was evenly dispersed in the base asphalt. Finally, it was sheared for 1.5 hours at a constant temperature of 150℃ and a shearing speed of 3000 r / min to reduce the particle size of the desulfurized waste rubber powder, thus obtaining ternary eutectic solvent-modified asphalt.

[0065] The mass ratio of desulfurized waste rubber powder to base asphalt in the ternary eutectic solvent-modified asphalt is 12:88.

[0066] The base asphalt is No. 90 Liaohe Petrochemical asphalt.

[0067] Example 3:

[0068] A method for modifying asphalt using ternary eutectic solvent-desulfurized waste rubber powder comprises the following steps:

[0069] I. Preparation of ternary eutectic solvents:

[0070] 60g of choline chloride, 15g of zinc salt and 300g of amide compound were mixed and then reacted at a constant temperature of 70℃ and a stirring speed of 300r / min for 6h. At this time, the mixture became a clear solution and a ternary eutectic solvent was obtained.

[0071] The zinc salt mentioned is zinc acetate;

[0072] The amide compound is formamide;

[0073] II. Ternary eutectic solvent desulfurization waste rubber powder:

[0074] 20g of waste rubber powder was dispersed in 1000g of ternary eutectic solvent, and then reacted for 4h at a constant temperature of 140℃ and a stirring speed of 1400r / min. After the reaction was completed, the mixture was washed with anhydrous ethanol and dried to obtain desulfurized waste rubber powder.

[0075] The average particle size of the waste adhesive powder is 254 μm;

[0076] III. Preparation of Modified Asphalt:

[0077] Using ultrasonic vibration at a frequency of 18 kHz, desulfurized waste rubber powder was vibrated for 30 minutes to pass through a 60-mesh sieve before being added to the base asphalt. Then, it was stirred for 2 hours at a constant temperature of 150℃ and a stirring speed of 700 r / min to ensure that the desulfurized waste rubber powder was evenly dispersed in the base asphalt. Finally, it was sheared for 2 hours at a constant temperature of 160℃ and a shearing speed of 4000 r / min to reduce the particle size of the desulfurized waste rubber powder, thus obtaining ternary eutectic solvent-modified asphalt.

[0078] The mass ratio of desulfurized waste rubber powder to base asphalt in the ternary eutectic solvent-modified asphalt is 14:86.

[0079] The base asphalt is No. 90 Liaohe Petrochemical asphalt.

[0080] Example 4:

[0081] A method for modifying asphalt using ternary eutectic solvent-desulfurized waste rubber powder comprises the following steps:

[0082] I. Preparation of ternary eutectic solvents:

[0083] 100g of choline chloride, 10g of zinc salt and 350g of amide compound were mixed and then reacted for 4h at a constant temperature of 80℃ and a stirring speed of 400r / min. At this time, the mixture became a clear solution and a ternary eutectic solvent was obtained.

[0084] The zinc salt mentioned is zinc sulfate;

[0085] The amide compound is caprolactam;

[0086] II. Ternary eutectic solvent desulfurization waste rubber powder:

[0087] 25g of waste rubber powder was dispersed in 750g of ternary eutectic solvent, and then reacted for 5h at a constant temperature of 160℃ and a stirring speed of 1600r / min. After the reaction was completed, the mixture was washed with anhydrous ethanol and dried to obtain desulfurized waste rubber powder.

[0088] The average particle size of the waste adhesive powder is 254 μm;

[0089] III. Preparation of Modified Asphalt:

[0090] Using ultrasonic vibration at a frequency of 18 kHz, desulfurized waste rubber powder was vibrated for 40 minutes to pass through a 60-mesh sieve before being added to the base asphalt. Then, it was stirred for 2.5 hours at a constant temperature of 160℃ and a stirring speed of 800 r / min to ensure that the desulfurized waste rubber powder was evenly dispersed in the base asphalt. Finally, it was sheared for 2.5 hours at a constant temperature of 170℃ and a shearing speed of 5000 r / min to reduce the particle size of the desulfurized waste rubber powder, thus obtaining ternary eutectic solvent-modified asphalt.

[0091] The mass ratio of desulfurized waste rubber powder to base asphalt in the ternary eutectic solvent-modified asphalt is 16:84.

[0092] The base asphalt is No. 90 Liaohe Petrochemical asphalt.

[0093] Example 5:

[0094] A method for modifying asphalt using ternary eutectic solvent-desulfurized waste rubber powder comprises the following steps:

[0095] I. Preparation of ternary eutectic solvents:

[0096] 150g of choline chloride, 12g of zinc salt and 450g of amide compound were mixed and then reacted for 2 hours at a constant temperature of 90℃ and a stirring speed of 500r / min. At this time, the mixture became a clear solution and a ternary eutectic solvent was obtained.

[0097] The zinc salt mentioned is zinc chloride;

[0098] The amide compound is urea;

[0099] II. Ternary eutectic solvent desulfurization waste rubber powder:

[0100] 30g of waste rubber powder was dispersed in 480g of ternary eutectic solvent, and then reacted for 6h at a constant temperature of 180℃ and a stirring speed of 1800r / min. After the reaction was completed, the mixture was washed with anhydrous ethanol and dried to obtain desulfurized waste rubber powder.

[0101] The average particle size of the waste adhesive powder is 254 μm;

[0102] III. Preparation of Modified Asphalt:

[0103] Using ultrasonic vibration at a frequency of 18 kHz, desulfurized waste rubber powder was vibrated for 50 minutes to pass through a 60-mesh sieve before being added to the base asphalt. Then, it was stirred for 3 hours at a constant temperature of 180℃ and a stirring speed of 900 r / min to ensure that the desulfurized waste rubber powder was evenly dispersed in the base asphalt. Finally, it was sheared for 3 hours at a constant temperature of 190℃ and a shearing speed of 6000 r / min to reduce the particle size of the desulfurized waste rubber powder, thus obtaining ternary eutectic solvent-modified asphalt.

[0104] The mass ratio of desulfurized waste rubber powder to base asphalt in the ternary eutectic solvent-modified asphalt is 18:82.

[0105] The base asphalt is No. 90 Liaohe Petrochemical asphalt.

[0106] Comparative Example 1: Undesulfurized waste rubber powder was added to this comparative example. The difference between this comparative example and Example 4 is that steps 1 and 2 are omitted, and in step 3, the desulfurized waste rubber powder is replaced with waste rubber powder. Everything else is the same as Example 4.

[0107] Comparative Example 2: This comparative example includes commercially available desulfurization waste rubber powder. The difference between this comparative example and Example 4 is that steps 1 and 2 are omitted, and in step 3, the desulfurization waste rubber powder is replaced with commercially available desulfurization waste rubber powder (model TL-800). Everything else is the same as in Example 4.

[0108] The desulfurized waste rubber powder prepared in step two of Examples 1 to 5, the waste rubber powder in Comparative Example 1, and the commercially available desulfurized waste rubber powder in Comparative Example 2 were soaked in toluene solution (25°C). Based on the principle of equilibrium swelling, their crosslinking density was calculated, and the test results are shown in Table 1.

[0109] Table 1 Crosslinking density of waste rubber powder and desulfurization waste rubber powder

[0110] Comparative Example 1 2.52 Comparative Example 2 1.63 Example 1 1.55 Example 2 1.42 Example 3 1.36 Example 4 1.15 Example 5 1.10

[0111] As shown in Table 1, the crosslinking density of desulfurized waste rubber powder based on ternary eutectic solvent is significantly lower than that of undesulfurized waste rubber powder and commercially available desulfurized waste rubber powder. This is because Zn 2+ As a Lewis acid, it coordinates with sulfur atoms in sulfur crosslinking bonds (such as SS and SC bonds), polarizing and weakening the bond energy, thus promoting the pyrolysis or oxidative breakage of sulfur bonds. Simultaneously, under high-temperature conditions, the amide group can accelerate the reaction with the CS and SS bonds of waste rubber powder, leading to the breakage of crosslinking bonds. Through the combined effect of these two aspects, the crosslinking network structure of waste rubber powder is destroyed to the greatest extent, resulting in a decrease in crosslinking density, which is beneficial for its interaction with asphalt.

[0112] The ternary eutectic solvent-modified waste rubber powder modified asphalt prepared in Examples 1 to 5, and the modified asphalt prepared in Comparative Examples 1 and 2 were placed in segregation tubes, and then tested in a constant temperature environment of 163℃ for 48 hours. The difference in softening points at the upper and lower ends of the tubes, i.e., the segregation softening point difference, was measured. The creep rate and ductility at 5℃ of the modified asphalt were also tested. The test results are shown in Table 2.

[0113] Table 2 Test results of modified asphalt

[0114]

[0115] As shown in Table 2, the waste rubber powder modified asphalt based on ternary eutectic solvent desulfurization exhibits improved performance compared to commercially available desulfurized waste rubber powder modified asphalt. The waste rubber powder modified asphalt based on ternary eutectic solvent desulfurization shows significant improvements in 5℃ ductility, creep rate, and stability in asphalt (differentiated softening point) compared to waste rubber powder modified asphalt. This is because the three-dimensional network structure of the waste rubber powder is disrupted, accelerating the swelling-degradation process in asphalt and leading to a greater degree of degradation. Therefore, the low-temperature crack resistance of the desulfurized waste rubber powder modified asphalt is significantly improved, and the softening point is significantly reduced, making it more conducive to the widespread application of waste rubber powder modified asphalt.

[0116] Figure 1 The image shows the differential scanning calorimetry (DSC) spectrum of the ternary eutectic solvent prepared in step one of Example 5. As can be seen from the image, the upward peak on the DSC curve is an endothermic peak, indicating that the sample underwent a phase transition from solid to liquid. Therefore, the melting point of the obtained ternary eutectic solvent is 16°C, which is lower than that of choline chloride (305°C), a decrease of 289°C.

Claims

1. A method for modifying asphalt with ternary eutectic solvent-desulfurized waste rubber powder, characterized in that... It is done in the following steps: I. Preparation of ternary eutectic solvents: Choline chloride, zinc salt and amide compound are mixed and then reacted at a constant temperature of 40℃~100℃ and a stirring speed of 20r / min~500r / min for 1h~10h until the mixture becomes a clear solution, thus obtaining a ternary eutectic solvent. The mass ratio of zinc salt to choline chloride is 1:(1~40); the mass ratio of choline chloride to amide compound is 1:(1~20); the zinc salt is zinc acetate, zinc chloride, zinc nitrate, or zinc sulfate; the amide compound is aminoformamide, acetamide, formamide, or caprolactam. II. Ternary eutectic solvent desulfurization waste rubber powder: Waste rubber powder was dispersed in a ternary eutectic solvent, and then reacted for 1 to 6 hours at a constant temperature of 100℃ to 200℃ and a stirring speed of 1000 r / min to 2200 r / min. After the reaction was completed, the mixture was washed and dried to obtain desulfurized waste rubber powder. The mass ratio of the waste rubber powder to the ternary eutectic solvent is 1:(1~100); III. Preparation of Modified Asphalt: The desulfurized waste rubber powder is sieved and added to the base asphalt. Then, under constant temperature and stirring conditions, the desulfurized waste rubber powder is evenly dispersed in the base asphalt. Finally, under constant temperature and shear conditions, the particle size of the desulfurized waste rubber powder is reduced to obtain ternary eutectic solvent-modified asphalt.

2. The method for modifying asphalt with ternary eutectic solvent desulfurization waste rubber powder according to claim 1, characterized in that... The particle size of the waste adhesive powder mentioned in step two is 20 mesh to 200 mesh.

3. The method for modifying asphalt with ternary eutectic solvent desulfurization waste rubber powder according to claim 1, characterized in that... In step three, the mass ratio of desulfurized waste rubber powder to base asphalt in the ternary eutectic solvent desulfurized waste rubber powder modified asphalt is 1:(4~99).

4. The method for modifying asphalt with ternary eutectic solvent desulfurization waste rubber powder according to claim 1, characterized in that... In step three, ultrasonic vibration is used to pass the desulfurized waste rubber powder through a 20-80 mesh sieve and then add it to the base asphalt. In step three, under the conditions of constant temperature of 130℃-200℃ and stirring speed of 500r / min-1000r / min, the mixture is stirred for 1h-3h until the desulfurized waste rubber powder is evenly dispersed in the base asphalt.

5. The method for modifying asphalt with ternary eutectic solvent desulfurization waste rubber powder according to claim 1, characterized in that... In step three, under constant temperature conditions of 140℃~200℃ and shearing speed of 2000r / min~8000r / min, shearing is performed for 1h~3h to reduce the particle size of desulfurized waste rubber powder.

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