A kind of high-efficiency recycled asphalt and preparation method thereof

Abstract

The present invention discloses a high-efficiency regenerated asphalt and a preparation method thereof, relating to the technical field of regenerated asphalt. The high-efficiency regenerated asphalt comprises the following raw materials in parts by weight: 5-15 parts base oil, 1-3 parts plasticizer, 0.5-1.5 parts anti-aging agent, 0.5-0.8 parts penetrant, 100 parts aged SBS modified asphalt, 3-5 parts structural repair agent, 1-4 parts anti-stripping agent, and 0.05 parts benzyldimethylamine; the structural repair agent is prepared by reacting tetrakis[4-(4'-carboxyphenyl)phenyl]ethylene with linoleyl alcohol to form a tetraester compound, which is then prepared under the action of formic acid and H2O2. The high-efficiency regenerated asphalt prepared by the present invention has good needle penetration, softening point, and anti-stripping properties.

Description

Technical Field

[0001] The present invention relates to the technical field of recycled asphalt, and in particular to a high-efficiency recycled asphalt and a preparation method thereof. Background Art

[0002] SBS is a thermoplastic copolymer with a triblock structure formed by the polymerization of butadiene and styrene. Due to its unique structural characteristics and performance advantages, SBS is often used in asphalt modification to improve the low-temperature cracking resistance and high-temperature rutting resistance of road asphalt. It is widely used in asphalt pavement construction worldwide. Over time, SBS-modified asphalt in roads is exposed to environmental influences and naturally ages, causing pavement damage. Compared to conventional base asphalt, the degree of aging of SBS-modified asphalt is not only related to the aging of the base asphalt but also largely depends on the degradation of the three-dimensional molecular network of the SBS modifier. Considering the large amount of recycled asphalt (RAP) generated during pavement maintenance and repair, if this waste is not effectively utilized, it will not only have a significant impact on the ecological environment but also lead to a significant waste of resources such as asphalt and stone. Therefore, recycling is currently the common practice.

[0003] Chinese invention patent publication number CN114874635A discloses a novel SBS-modified asphalt containing a synchronous warm-mix regeneration agent and its preparation method. The invention's novel SBS-modified asphalt containing a synchronous warm-mix regeneration agent comprises the following components: 78%-89% SBS-modified asphalt, 5%-10% colloidal structure regulator, 1%-3% SBS cross-linker, 3%-5% warm-mix agent, and 2%-4% warm-mix compensator. This warm-mix regenerated asphalt not only restores the colloidal structural stability of aged SBS-modified asphalt but also repairs the SBS three-dimensional molecular network, achieving a synchronous regeneration effect. However, its needle penetration is low, making it prone to brittle fracture. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a high-efficiency regenerated asphalt and a preparation method thereof.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A high-efficiency recycled asphalt comprising the following raw materials in parts by weight:

[0007] 5-15 parts of base oil, 1-3 parts of plasticizer, 0.5-1.5 parts of anti-aging agent, 0.5-0.8 parts of penetrant, 100 parts of aged SBS modified asphalt, 3-5 parts of structural repair agent, 1-4 parts of anti-stripping agent, 0.05 parts of benzyldimethylamine;

[0008] The structural repair agent is prepared by the following method:

[0009] S1: Tetrakis[4-(4'-carboxyphenyl)phenyl]ethylene reacts with linoleyl alcohol to form a tetraester compound; the reaction equation is as follows:

[0010]

[0011] S2: The tetraester compound generates a structural repair agent under the action of formic acid and H2O2; the reaction equation is as follows:

[0012]

[0013] In step S1, the molar ratio of tetrakis[4-(4'-carboxyphenyl)phenyl]ethylene to linoleyl alcohol is 1:(4.2-5).

[0014] In step S2, the mass ratio of the tetraester compound to formic acid is 4:(1-1.1).

[0015] The anti-stripping agent is prepared by the following method:

[0016] N1: 2,2'-dithiodiethanol reacts with p-aminophenylacetic acid to form a diamino compound; the reaction equation is as follows:

[0017]

[0018] N2: The diamino compound reacts with 3-(methacryloyloxy)propyltrimethoxysilane to form an anti-stripping agent; the reaction equation is as follows:

[0019]

[0020] In step N1, the molar ratio of 2,2'-dithiodiethanol to p-aminophenylacetic acid is 1.1:2.

[0021] In step N2, the molar ratio of the bisamino compound to 3-(isomethacryloyloxy)propyltrimethoxysilane is 1:2.1.

[0022] The penetrant is nonylphenol polyoxyethylene ether.

[0023] The plasticizer is one of dibutyl phthalate and dioctyl phthalate.

[0024] The anti-aging agent is a mixture of one or more of antioxidant 1076, antioxidant 1010, and light stabilizer 770DF.

[0025] A method for preparing high-efficiency regenerated asphalt comprises the following steps:

[0026] (1) Weigh by weight: 5-15 parts of base oil, 1-3 parts of plasticizer, 0.5-1.5 parts of anti-aging agent, 0.5-0.8 parts of penetrant, 100 parts of aged SBS modified asphalt, 3-5 parts of structural repair agent, 1-4 parts of anti-stripping agent, and 0.05 parts of benzyldimethylamine;

[0027] (2) The base oil, plasticizer, anti-aging agent, and penetrant are heated and stirred to obtain a composite oil component; the aged SBS modified asphalt is heated to a molten state, and the composite oil component is injected into the aged SBS modified asphalt under stirring; a structural repair agent and benzyldimethylamine are added and stirred; the temperature is lowered, and an anti-stripping agent is added and stirred to obtain a highly efficient regenerated asphalt.

[0028] Due to the adoption of the above technical solution, the beneficial effects of the present invention include:

[0029] (1) The epoxy functional groups in the structural repair agent prepared by the present invention can react with the hydroxyl and carboxyl groups generated by SBS aging to form a cross-linked structure, thereby restoring its mechanical properties; the rigid biphenyl structure can improve its high-temperature stability.

[0030] (2) The silyl methoxy and amino groups in the anti-stripping agent prepared by the present invention are connected to the stone surface through covalent bonds or hydrogen bonds, and the amino benzene ring structure and the benzene ring in asphalt or SBS are stacked through π-π, playing an anchoring role. The three work synergistically to improve the anti-stripping performance. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the embodiments, but the present invention is not limited to these embodiments.

[0032] Example 1 Preparation of structural repair agent:

[0033] S1: Under nitrogen protection, 500 ml of anhydrous toluene, 0.1 mol of tetrakis[4-(4'-carboxyphenyl)phenyl]ethylene, 0.42 mol of linoleyl alcohol, and 5 g of p-toluenesulfonic acid were added to a reaction kettle, heated to 80°C, and reacted for 14 h (water was removed using a water separator during the reaction). The mixture was cooled to room temperature and the pH was adjusted to 7 with saturated sodium bicarbonate. The layers were separated and the organic phase was washed three times with deionized water (300 ml each time), dried over 30 g of anhydrous magnesium sulfate, filtered, and distilled under reduced pressure at 70°C for 5 h to obtain a tetraester compound. Its H NMR spectrum data are as follows: 1 H NMR (300 MHz, Chloroform- d) δ 8.06 - 7.95 (m, 8H), 7.84 -7.74 (m, 8H), 7.64 - 7.52 (m, 16H), 5.57 - 5.34 (m, 16H), 4.36 (t, J = 6.1Hz, 8H), 2.37 (dddt, J = 6.8, 5.0, 1.8, 0.8 Hz, 8H), 2.11 - 1.96 (m, 16H), 1.86 - 1.71 (m, 8H), 1.50 - 1.18 (m, 64H), 0.97 - 0.82 (m, 12H);

[0034] S2: 500 ml of DMF, 180 g of a tetraester compound, and 8 g of a strong acid cation exchange resin were sequentially added to a reactor, stirred, and heated to 60°C. A mixed solution of 45 g of formic acid and 110 g of 30 wt% H2O2 was added dropwise over a period of 1 hour. The mixture was allowed to react for 10 hours, cooled to room temperature, filtered, and distilled under reduced pressure at 60°C for 3 hours. The mixture was washed three times with deionized water (500 ml each time), and dried under vacuum at 60°C for 10 hours to obtain a structural repair agent. Its H NMR spectrum data are as follows: 1 H NMR (300 MHz, Chloroform- d ) δ 8.04 - 7.97 (m,8H), 7.65 - 7.53 (m, 16H), 7.33 - 7.25 (m, 8H), 4.32 (t, J = 6.1 Hz, 8H), 3.42 (q, J = 5.0 Hz, 8H), 3.22 (dt, J = 0.89 (ddt, J = 7.0, 4.1, 2.5 Hz, 12H).

[0035] Example 2 Preparation of structural repair agent:

[0036] S1: Under nitrogen protection, 500 ml of anhydrous toluene, 0.1 mol of tetrakis[4-(4'-carboxyphenyl)phenyl]ethylene, 0.45 mol of linoleyl alcohol, and 5 g of p-toluenesulfonic acid were added to a reactor, heated to 85°C, reacted for 11 h (water was removed using a water separator during the reaction), cooled to room temperature, and the pH was adjusted to 7 with saturated sodium bicarbonate. The layers were separated, and the organic phase was washed three times with deionized water (300 ml each time), dried with 30 g of anhydrous magnesium sulfate, filtered, and distilled under reduced pressure at 70°C for 5 h to obtain a tetraester compound;

[0037] S2: 500 ml of DMF, 180 g of a tetraester compound, and 8 g of a strong acid cation exchange resin were sequentially added to a reactor, stirred, and heated to 65°C. A mixed solution of 47 g of formic acid and 115 g of 30 wt% H2O2 was added dropwise for 1 hour. The reaction was continued for 8 hours, cooled to room temperature, filtered, and distilled under reduced pressure at 60°C for 3 hours. The mixture was washed three times with deionized water (500 ml each time), and vacuum dried at 60°C for 10 hours to obtain a structural repair agent.

[0038] Example 3 Preparation of structural repair agent:

[0039] S1: Under nitrogen protection, 500 ml of anhydrous toluene, 0.1 mol of tetrakis[4-(4'-carboxyphenyl)phenyl]ethylene, 0.5 mol of linoleyl alcohol, and 5 g of p-toluenesulfonic acid were added to a reactor, heated to 90°C, reacted for 10 h (water was removed using a water separator during the reaction), cooled to room temperature, and the pH was adjusted to 7 with saturated sodium bicarbonate. The layers were separated, and the organic phase was washed three times with deionized water (300 ml each time), dried with 30 g of anhydrous magnesium sulfate, filtered, and distilled under reduced pressure at 70°C for 5 h to obtain a tetraester compound;

[0040] S2: 500 ml of DMF, 180 g of a tetraester compound, and 8 g of a strong acid cation exchange resin were sequentially added to a reactor, stirred, and heated to 70°C. A mixed solution of 50 g of formic acid and 120 g of 30 wt% H2O2 was added dropwise for 1 hour. The reaction was continued for 6 hours, cooled to room temperature, filtered, and distilled under reduced pressure at 60°C for 3 hours. The mixture was washed three times with deionized water (500 ml each time), and vacuum dried at 60°C for 10 hours to obtain a structural repair agent.

[0041] Example 4 Preparation of anti-stripping agent:

[0042] N1: Under nitrogen protection, 300 ml of toluene, 0.11 mol of 2,2'-dithiodiethanol, 0.2 mol of p-aminophenylacetic acid, and 2 g of p-toluenesulfonic acid were added to a reactor, heated to 90°C, and reacted for 8 h (water was removed using a water separator during the reaction). The mixture was cooled to room temperature and the pH was adjusted to 7 with saturated sodium bicarbonate. The layers were separated and the organic phase was washed three times with deionized water (200 ml each time), dried over 30 g of anhydrous magnesium sulfate, filtered, and distilled under reduced pressure at 60°C for 3 h to obtain a bisamino compound. Its H NMR spectrum data are as follows: 1 H NMR (300 MHz, Chloroform- d ) δ 7.27 - 7.16 (m, 4H), 6.63 - 6.52 (m, 4H), 4.34 (t, J = 4.7 Hz, 4H), 4.28 (s, 4H), 3.58 (t, J = 0.8 Hz, 4H), 2.95 (t, J= 4.7 Hz, 4H);

[0043] N2: 500 ml of anhydrous toluene, 0.1 mol of a bisamino compound, 0.21 mol of 3-(isomethylacryloyloxy)propyltrimethoxysilane, and 0.02 mol of BiCl3 were added to a sealed reaction vessel, stirred and mixed, and refluxed for 10 h. The mixture was cooled to room temperature, filtered, and distilled under reduced pressure at 60°C for 3 h to obtain an anti-stripping agent. Its H NMR spectrum data are as follows: 1 H NMR (300 MHz, Chloroform- d )δ 7.16 (dt, J = 8.0, 1.0 Hz, 4H), 6.54 - 6.47 (m, 4H), 5.44 (t, J = 5.9 Hz,2H), 4.29 (t, J = 4.7 Hz, 4H), 4.08 (td, J = 7.6, 0.9 Hz, 4H), 3.57 (d, J =5.8 Hz, 22H), 3.45 (d, J = 20.7 Hz, 4H), 2.99 (dt, J = 9.3, 4.8 Hz, 4H), 2.67(d, J = 7.3 Hz, 2H), 1.85 - 1.75 (m, 4H), 1.09 (d, J = 7.3 Hz, 6H), 0.72 (t,J = 9.8 Hz, 4H).

[0044] Example 5 Preparation of High-Efficiency Regenerated Asphalt:

[0045] (1) Weigh: 50 g of base oil, 10 g of plasticizer (dibutyl phthalate), 5 g of antioxidant (antioxidant 1076), 5 g of penetrant (nonylphenol polyoxyethylene ether), 1000 g of aged SBS modified asphalt, 30 g of structural repair agent (prepared in Example 1), 10 g of anti-stripping agent (prepared in Example 4), and 0.5 g of benzyldimethylamine;

[0046] (2) The base oil, plasticizer, anti-aging agent, and penetrant were heated to 90°C and stirred for 1 hour to obtain a composite oil component; the aged SBS modified asphalt was heated to a molten state at 150°C and stirred at a speed of 500 rpm, and the above composite oil component was injected into the aged SBS modified asphalt and stirred for 10 minutes; the structural repair agent was added and stirred at 800 rpm for 30 minutes; the temperature was lowered to 90°C, and an anti-stripping agent and benzyldimethylamine were added and stirred for 20 minutes to obtain a high-efficiency regenerated asphalt.

[0047] Example 6 Preparation of High-Efficiency Regenerated Asphalt:

[0048] (1) Weigh: 100 g of base oil, 20 g of plasticizer (dioctyl phthalate), 2 g of antioxidant (10768 g of antioxidant, 2 g of light stabilizer 770DF), 6 g of penetrant (nonylphenol polyoxyethylene ether), 1000 g of aged SBS modified asphalt, 40 g of structural repair agent (prepared in Example 2), 30 g of anti-stripping agent (prepared in Example 4), and 0.5 g of benzyldimethylamine;

[0049] (2) The base oil, plasticizer, anti-aging agent, and penetrant were heated to 95°C and stirred for 1.5 hours to obtain a composite oil component; the aged SBS modified asphalt was heated to a molten state at 155°C with a stirring speed of 500 rpm, and the above composite oil component was injected into the aged SBS modified asphalt and stirred for 10 minutes; the structural repair agent was added and stirred at 800 rpm for 30 minutes; the temperature was lowered to 95°C, and an anti-stripping agent and benzyldimethylamine were added and stirred for 20 minutes to obtain a high-efficiency regenerated asphalt.

[0050] Example 7 Preparation of High-Efficiency Regenerated Asphalt:

[0051] (1) Weigh: 150 g of base oil, 30 g of plasticizer (dioctyl phthalate), 10 g of antioxidant (antioxidant 101010 g, 5 g of light stabilizer 770DF), 8 g of penetrant (nonylphenol polyoxyethylene ether), 1000 g of aged SBS modified asphalt, 50 g of structural repair agent (prepared in Example 3), 40 g of anti-stripping agent (prepared in Example 4), and 0.5 g of benzyldimethylamine;

[0052] (2) The base oil, plasticizer, anti-aging agent, and penetrant were heated to 100°C and stirred for 2 h to obtain a composite oil component; the aged SBS modified asphalt was heated to 160°C to a molten state, the stirring speed was 500 rpm, and the above composite oil component was injected into the aged SBS modified asphalt and stirred for 10 min; the structural repair agent was added and stirred at 800 rpm for 30 min; the temperature was lowered to 100°C, and the anti-stripping agent and benzyldimethylamine were added and stirred for 20 min to obtain a high-efficiency regenerated asphalt.

[0053] Comparative Example 1

[0054] The raw material composition and process of high-efficiency regenerated asphalt are basically the same as those in Example 6, except that the structural repair agent (prepared in Example 2) is replaced by an equal weight of a structural repair agent prepared by the following method:

[0055] The preparation method of the structural repair agent is substantially the same as that of Example 2, except that the tetrakis[4-(4'-carboxyphenyl)phenyl]ethylene in step S1 is replaced with an equimolar amount of butanetetracarboxylic acid.

[0056] Comparative Example 2

[0057] The raw material composition and process of high-efficiency regenerated asphalt are basically the same as those in Example 6, except that the structural repair agent (prepared in Example 2) is replaced by an equal weight of a structural repair agent prepared by the following method:

[0058] The preparation method of the structural repair agent is substantially the same as that of Example 2, except that the linoleyl alcohol in step S1 is replaced by an equal molar amount of oleyl alcohol.

[0059] Comparative Example 3

[0060] The raw material composition and process of high-efficiency regenerated asphalt are basically the same as those in Example 6, except that the structural repair agent (prepared in Example 2) is replaced by an equal weight of a structural repair agent prepared by the following method:

[0061] The preparation method of the structural repair agent is basically the same as that of Example 2, except that the linoleyl alcohol in step S1 is replaced by an equimolar amount of (9Z,12Z,15Z)-9,12,15-octadecatrie-1-ol; the amount of formic acid added in step S2 is increased to 67 g, and the amount of 30 wt% H2O2 added is increased to 165 g.

[0062] Comparative Example 4

[0063] The raw material composition and process of high-efficiency regenerated asphalt are basically the same as those in Example 6, except that the anti-stripping agent (prepared in Example 4) is replaced by an equal weight of an anti-stripping agent prepared by the following method:

[0064] The preparation method of the anti-stripping agent is substantially the same as that of Example 4, except that the 2,2'-dithiodiethanol in step N1 is replaced by an equal molar amount of 1,6-hexanediol.

[0065] Comparative Example 5

[0066] The raw material composition and process of high-efficiency regenerated asphalt are basically the same as those in Example 6, except that the anti-stripping agent (prepared in Example 4) is replaced by an equal weight of an anti-stripping agent prepared by the following method:

[0067] The preparation method of the anti-stripping agent is basically the same as that of Example 4, except that the p-aminophenylacetic acid in step N1 is replaced by an equimolar amount of glycine.

[0068] Comparative Example 6

[0069] The raw material composition and process of high-efficiency regenerated asphalt are basically the same as those in Example 6, except that the anti-stripping agent (prepared in Example 4) is replaced by an equal weight of a diamino compound (prepared in step N1 of Example 4).

[0070] The aged SBS modified asphalt used in the examples and comparative examples of the present application was prepared by the following method: the base asphalt was heated to 150°C, 4.5 wt% of SBS was added with stirring, and mechanical stirring was carried out at a speed of 1000 rpm for 2 hours to obtain SBS modified asphalt; the SBS modified asphalt was placed in a rotary thin film oven and aged at 163°C for 100 hours to obtain aged SBS modified asphalt.

[0071] The matrix asphalt used in this application is AH-70 road petroleum asphalt, produced by Liaohe Petrochemical Branch of China National Petroleum Corporation; the SBS model is SBS1301-1 (YH-791H), produced by Baling Petrochemical Branch of China Petrochemical Group; the base oil model is Maoming Petrochemical 150N; the nonylphenol polyoxyethylene ether model is NP-10; the strong acid cation exchange resin is a polymer of divinylbenzene and sodium vinylbenzene sulfonate, and the brand is Amberlite® IMAC HP1110 resin.

[0072] The regenerated asphalt prepared in Examples 5-7 and Comparative Examples 1-3 of the present application was tested for 25°C needle penetration and softening point according to JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures for Highway Engineering". The test results are shown in Table 1.

[0073] An asphalt mixture was prepared by heating the recycled asphalt prepared in Examples 5-7 or Comparative Examples 4-6 to 150°C, mixing 200g of the heated asphalt composite with 300g of fine aggregate and 600g of coarse aggregate, and stirring for 30 minutes. The coarse aggregate was basalt crushed stone with a particle size of 5-8mm and an apparent relative density of 2.83; the fine aggregate was basalt machine-made sand with a particle size of 1-2mm and an apparent relative density of 2.75.

[0074] The prepared asphalt mixture was tested for its water-immersion Marshall residual stability according to JTG E20-2011 “Test Procedure for Asphalt and Asphalt Mixtures for Highway Engineering”. The test results are shown in Table 1.

[0075] Table 1 Asphalt performance indicators

[0076]

[0077] It can be seen from Table 1 that the high-efficiency regenerated asphalt prepared in Examples 5-7 of the present application has good needle penetration, softening point and anti-stripping performance.

[0078] The structural repair agent prepared by the present invention contains a large number of epoxy groups, which can produce cross-linking reactions with the hydroxyl and carboxyl groups in the aged SBS product, and can reconnect the broken SBS molecular chains to restore their molecular weight and mechanical properties. The stability of the rigid biphenyl structure can provide high-temperature resistance, which is manifested as an increase in the softening point. The structural repair agent used in Comparative Example 1 does not contain a benzene ring structure and has poor high-temperature resistance, which is manifested as a low softening point. The structural repair agents used in Comparative Examples 2 and 3 have different numbers of epoxy groups. The structural repair agents with fewer epoxy groups have a lower cross-linking density and a lower softening point. On the other hand, the structural repair agents with more epoxy groups have a higher cross-linking density, which leads to an increase in the softening point, a decrease in needle penetration, and are prone to low-temperature cracking.

[0079] The silyl methoxy group in the anti-stripping agent prepared by the present invention can form a covalent bond or hydrogen bond with the hydroxyl group on the surface of the stone through a condensation reaction, and the hydrophilic amino group has a strong affinity with the acidic stone; the benzene ring structure and the benzene ring in the asphalt play an anchoring role through π-π stacking, thereby enhancing its anti-stripping effect; the amino group forms a covalent bond or hydrogen bond with the active sites on the surface of the stone (such as hydroxyl group, Ca carbonate) through hydrogen bonds or ionic bonds. 2+ ) to form a strong adsorption layer, improving anti-stripping performance. Anti-stripping agents contain dynamic disulfide bonds. Their break-and-recombination properties enable asphalt to self-repair when damaged by external forces or microcracks through dynamic exchange reactions to reconnect broken molecular chains, thereby improving anti-stripping performance.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. However, any equivalent changes, modifications and evolutions made by ordinary technicians in this field without departing from the scope of the technical solution of the present invention by using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A high-efficiency recycled asphalt, characterized in that: The composition comprises the following raw materials in parts by weight: 5-15 parts of base oil, 1-3 parts of plasticizer, 0.5-1.5 parts of anti-aging agent, 0.5-0.8 parts of penetrant, 100 parts of aged SBS modified asphalt, 3-5 parts of structural repair agent, 1-4 parts of anti-stripping agent, 0.05 parts of benzyldimethylamine; The structural repair agent is prepared by the following method: S1: Tetrakis[4-(4'-carboxyphenyl)phenyl]ethylene reacts with linoleyl alcohol to form a tetraester compound; S2: Tetraester compounds generate structural repair agents under the action of formic acid and H2O2; The anti-stripping agent is prepared by the following method: N1: 2,2'-dithiodiethanol reacts with p-aminophenylacetic acid to form a diamino compound; N2: The bisamino compound reacts with 3-(methacryloyloxy)propyltrimethoxysilane to form an anti-stripping agent.

2. The high-efficiency regenerated asphalt according to claim 1, characterized in that: In step S1, the molar ratio of tetrakis[4-(4'-carboxyphenyl)phenyl]ethylene to linoleyl alcohol is 1:(4.2-5).

3. The high-efficiency regenerated asphalt according to claim 1, characterized in that: In step S2, the mass ratio of the tetraester compound to formic acid is 4:(1-1.1).

4. The high-efficiency regenerated asphalt according to claim 1, characterized in that: In step N1, the molar ratio of 2,2'-dithiodiethanol to p-aminophenylacetic acid is 1.1:

2.

5. The high-efficiency regenerated asphalt according to claim 1, characterized in that: In step N2, the molar ratio of the bisamino compound to 3-(isomethacryloyloxy)propyltrimethoxysilane is 1:2.

1.

6. The high-efficiency regenerated asphalt according to claim 1, characterized in that: The penetrant is nonylphenol polyoxyethylene ether.

7. The high-efficiency regenerated asphalt according to claim 1, characterized in that: The plasticizer is one of dibutyl phthalate and dioctyl phthalate.

8. The high-efficiency regenerated asphalt according to claim 1, characterized in that: The anti-aging agent is a mixture of one or more of antioxidant 1076, antioxidant 1010, and light stabilizer 770DF.

9. A method for preparing high-efficiency regenerated asphalt according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) Weigh by weight: 5-15 parts of base oil, 1-3 parts of plasticizer, 0.5-1.5 parts of anti-aging agent, 0.5-0.8 parts of penetrant, 100 parts of aged SBS modified asphalt, 3-5 parts of structural repair agent, 1-4 parts of anti-stripping agent, and 0.05 parts of benzyldimethylamine; (2) The base oil, plasticizer, anti-aging agent, and penetrant are heated and stirred to obtain a composite oil component; the aged SBS modified asphalt is heated to a molten state, and the composite oil component is injected into the aged SBS modified asphalt under stirring; a structural repair agent and benzyldimethylamine are added and stirred; the temperature is lowered, and an anti-stripping agent is added and stirred to obtain a highly efficient regenerated asphalt.

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