Asphalt regeneration agent, modified regenerated asphalt mixture, preparation method and use thereof

Abstract

The present invention relates to the technical field of waste asphalt regeneration, specifically an asphalt regeneration agent, a modified regenerated asphalt mixture, and a preparation method and use thereof. The asphalt regeneration agent is made of a thinning oil, a plasticizer, a surfactant, a methyl long carbon chain alkyl silicone oil, liquid EVA, emulsion styrene-butadiene rubber, a liquid petroleum resin, LLDPE, Mxenes, and a microcapsule stabilizer composed of ethylene bisstearamide, sulfur, and N-phenyl-N'-cyclohexyl-p-phenylenediamine. The modified regenerated asphalt mixture is made of milling material, an asphalt regeneration agent, SBS modified asphalt, new aggregate, and mineral powder. The prepared asphalt regeneration agent can increase the amount of milling material in the regenerated asphalt mixture and improve the performance of the regenerated asphalt mixture, thereby facilitating the recycling of waste asphalt, improving resource utilization, and reducing the cost of asphalt pavement construction.

Description

Technical Field

[0001] The present invention relates to the technical field of waste asphalt regeneration, in particular to an asphalt regeneration agent, a modified regenerated asphalt mixture, a preparation method and uses thereof. Background Art

[0002] Recycled asphalt mixture refers to a mixture made by remixing old asphalt pavement that has been excavated, recycled, crushed, and screened (i.e., waste milling material) with asphalt regeneration agents, new asphalt materials, and new aggregates in a specific proportion. Asphalt regeneration agents, also known as asphalt concrete regeneration agents, are materials added to old asphalt to restore or partially restore its performance (Asphalt Concrete Regeneration Agent CJ-T554-2024), such as improving the penetration and ductility of the old asphalt. Commonly used asphalt regeneration agents include paraffin oil, aromatic extracts, tall oil, naphthenic oil, triglycerides, and fatty acids (derived from vegetable oils).

[0003] In recent years, domestic and international scholars have conducted extensive research on the high-proportion utilization of RAP in recycled asphalt mixtures, proposing high-dosage RAP application technology to increase the RAP ratio to over 40%. However, there are problems such as the inability to restore the content of the recycled asphalt mixture modifier and the limited improvement of the mixture performance, making it impossible to apply high-dosage RAP regeneration technology to the entire structural layer of asphalt pavement. CN104893058A provides a green and environmentally friendly asphalt modifier that recycles waste rubber, but it also uses expensive nanosilver and is used as an asphalt modifier, such as improving the softening point of new asphalt or increasing the low-temperature ductility of asphalt, rather than for asphalt regeneration of waste milling materials. CN104788970A provides a regeneration agent and mixture for hot-regenerated asphalt. The regeneration agent contains tall oil, methyl silicone oil, epoxy fatty acid methyl ester, etc., and can increase the RAP production ratio to 70%. CN115385607A provides a regenerated asphalt mixture that uses aromatic oil as an asphalt regeneration agent, but it is a new warm mix agent rather than an asphalt regeneration agent or for in-situ hot-regeneration of asphalt mixtures. Summary of the Invention

[0004] To address the above issues, the present invention aims to provide an asphalt regeneration agent, a modified recycled asphalt mixture, and a preparation method and use thereof, thereby enabling the use of high-dosage RAP materials, reducing the overall cost of the recycled asphalt mixture while maintaining or improving the overall road performance of the recycled asphalt mixture. To achieve the above objectives, the present invention provides the following technical solutions:

[0005] First, the present invention provides an asphalt regeneration agent, which is made of the following materials by mass percentage: 25-40% of line-cutting oil, 5-12% of BT plasticizer, 3-10% of BH surfactant, 3-10% of methyl long carbon chain alkyl silicone oil, 5-15% of liquid EVA, 10-18% of emulsion styrene-butadiene rubber, 10-16% of liquid petroleum resin, 5-15% of LLDPE, 1-3% of microcapsule stabilizer, and 1-3% of Mxenes. The line-cutting oil is composed of line-cutting oil and line-cutting oil in a mass ratio of 3:1; the BT plasticizer is composed of tall oil, pine tar, and epoxy fatty acid methyl ester in a mass ratio of (2-5):(2-4):(2-4); and the BH surfactant is composed of surfactant alkyl glucoside, petroleum sulfonate, alkylbenzene polyoxyethylene ether, and fatty acid glyceride in a mass ratio of (1-4):(3-4):(1-2):(2-3). The microcapsule stabilizing agent consists of ethylene bisstearamide, sulfur and N-phenyl-N'-cyclohexyl-p-phenylenediamine in a mass ratio of (3-8): (1-6): (1-2).

[0006] Preferably, the mass ratio of ethylene bisstearamide, sulfur, and N-phenyl-N'-cyclohexyl-p-phenylenediamine in the microcapsule stabilizer is selected from one of 3:6:1, 8:1:1, 5:3:2, and 6:3:1.

[0007] Preferably, the mass ratio of tall oil, pine tar and epoxy fatty acid methyl ester in the BT plasticizer is selected from one of 5:2:2, 4:3:3, 3:4:3 and 2:4:4.

[0008] Preferably, the mass ratio of the surfactants alkyl glucoside, petroleum sulfonate, alkylbenzene polyoxyethylene ether, and fatty acid glyceride in the BH surfactant is selected from one of 4:3:1:2, 3:3:2:2, 2:4:2:2, and 1:4:2:3.

[0009] Preferably, the aforementioned Mxenes can be selected from one or more commercially available MXene-Ti3AlC2, MXene-Ti3C2, MXene-Ti2C, etc.

[0010] Preferably, the aforementioned alkyl glucoside can be selected from one or more of dodecyl glucoside, undecyl glucoside or cetearyl glucoside.

[0011] Preferably, the petroleum sulfonate can be selected from one or more of heavy alkylbenzene sulfonate (HABS), heavy aromatic petroleum sulfonate (HAPS) or fatty alcohol polyoxyethylene ether sulfonate (AESO).

[0012] Preferably, the aforementioned alkylbenzene polyoxyethylene ether can be selected from one or more of NP-4, NP-6, NP-9, etc. The aforementioned fatty acid glyceride can be selected from one or more of monoglyceride, diglyceride, triglyceride, etc.

[0013] Secondly, the present invention provides a method for preparing the aforementioned asphalt regeneration agent, comprising the following steps:

[0014] S1: heating the asphalt regeneration agent, BT plasticizer and methyl long carbon chain alkyl silicone oil to 120-130°C and premixing for 35 minutes to obtain an asphalt regeneration agent premix;

[0015] S2: adding liquid EVA, emulsion styrene-butadiene rubber, liquid petroleum resin, and LLDPE to the asphalt regeneration agent premix of step S1 in sequence, and shearing with a shearing machine for 20 to 60 minutes to obtain an asphalt regeneration agent pre-sheared material;

[0016] S3: The asphalt regeneration agent pre-sheared material of step S2 is transferred to the stirrer, and the microcapsule stabilizer and MXenes are added, and stirred at 600 r / min for 10 to 15 minutes to obtain the asphalt regeneration agent microcapsule premix;

[0017] S4: Add BH surfactant to the asphalt regeneration agent microcapsule premix of step S3, keep the stirring rate of step S3 unchanged, and stir for 3 to 5 minutes to obtain the asphalt regeneration agent.

[0018] Again, the present invention provides a modified recycled asphalt mixture prepared by the aforementioned asphalt regeneration agent, which is made of the following materials by mass percentage: 40-82% milling material, 0.15-0.5% asphalt modifier, 0.8-2% SBS modified asphalt, 15-50% new aggregate, and 1-2% mineral powder.

[0019] Among them, milling material, SBS modified asphalt, mineral powder, new aggregate, etc. are commonly used materials in this field. For example, the mineral powder can be selected from limestone powder or blast furnace slag, etc.; the new aggregate can be selected from basalt, limestone, etc.

[0020] In addition, the present invention provides a method for preparing the aforementioned modified recycled asphalt mixture, comprising the following steps:

[0021] Z1: Heat the milling material to 160-170℃, spray the asphalt regeneration agent into it, and mix it for 25-40 seconds to obtain the old asphalt-regeneration agent mixture;

[0022] Z2: Add the preheated new aggregate and SBS modified asphalt to the old asphalt-regeneration agent mixture in step Z1 in sequence, then add mineral powder and mix at 100-300r / min.

[0023] Preferably, the preheating temperatures of the new aggregate and SBS modified asphalt in step Z2 are 180-190° C. and 175-180° C., respectively.

[0024] Preferably, in step Z2, the new aggregate is added and mixed for 30 to 50 seconds, the SBS modified asphalt is added and mixed for 30 to 50 seconds, and the mineral powder is added and mixed for 30 to 50 seconds.

[0025] In addition, the present invention provides the use of the above-mentioned asphalt regeneration agent as a recycling and regeneration treatment agent for waste milling materials.

[0026] Beneficial effects of the present invention:

[0027] The asphalt regeneration agent provided by the present invention is used for regenerating waste milling materials, has good regeneration effect, can increase the content of waste milling materials in the regenerated asphalt mixture by 80%, and the performance of the regenerated asphalt mixture is equivalent to that of new asphalt mixture.

[0028] Among them, the line-cutting oil, primarily composed of alkanes, cycloalkanes, and aromatic hydrocarbons, is used to improve the viscosity and viscosity index of the rejuvenator, replenish the aromatic content in the rejuvenator, enhance the system stability, and improve the material's antioxidant and high-temperature resistance. BT plasticizers improve the adhesiveness and cold resistance of the rubber compound, facilitate the dispersion of additives, delay vulcanization, and generate high dynamic heat. BH surfactants modify the spatial structure of the old asphalt, reducing intermolecular friction, enhancing the flexibility and lubrication properties of the old asphalt, and significantly reducing the asphalt's surface energy. MXenes, as an inducing agent, enhance the interaction between the asphalt rejuvenator and the old asphalt matrix, promoting interfacial fusion and polymer reaction progress, and improving the mechanical and fatigue properties of the old asphalt. Methyl long-chain alkyl silicone oil has low surface tension and exhibits excellent synergy with BH surfactants, providing strong molecular lubrication, excellent heat resistance, and hydrophobicity. Liquid EVA offers permanent flexibility, acid and alkali resistance, UV aging resistance, and good compatibility. It can be mixed with most additives and exhibits a certain degree of adhesion. Emulsion styrene-butadiene rubber is a copolymer synthesized in an emulsion from 1,3-butadiene and styrene via a free radical reaction mechanism. Adding it to old asphalt as a modifier significantly improves its high- and low-temperature performance and aging resistance. Liquid petroleum resin offers excellent fluidity, stable color, aging resistance, and chemical corrosion resistance. LLDPE, produced by copolymerizing ethylene with a small amount of α-olefins, offers advantages such as excellent toughness, heat resistance, and cold resistance.

[0029] The microcapsule stabilizer utilizes sulfur and N-phenyl-N'-cyclohexyl-p-phenylenediamine as its core material, and high-melting-point ethylene bisstearamide as its wall material. Leveraging the high melting point of ethylene bisstearamide, the microcapsule stabilizer undergoes a purely physical blending phase with additives such as line oil and resin during the first stage of preparation, preventing cross-linking and ensuring the regenerator's excellent fluidity. However, when the regenerator and recycled material are mixed, the temperature exceeds the melting point of the wall material, triggering a secondary release phase where the microcapsule stabilizer cross-links with the resin and asphalt, exerting a secondary modification effect and replenishing the missing light components and modifiers in the old asphalt. This secondary action of the microcapsule stabilizer overcomes incompatibility issues in material mixing and fully utilizes the material's advantages. DETAILED DESCRIPTION

[0030] The technical solutions of the present invention are described clearly and completely below with reference to specific embodiments. Obviously, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0031] The raw materials used in the following examples are all commercially available products. For example, the methyl long carbon chain alkyl silicone oil can be selected from the commercially available VM-12 methyl long carbon chain alkyl silicone oil. MXenes can be selected from one or more of the commercially available MXene-Ti3AlC2, MXene-Ti3C2, MXene-Ti2C, etc. Alkyl glucoside can be selected from one or more of the commercially available dodecyl glucoside, undecyl glucoside, or cetearyl glucoside. Petroleum sulfonate can be selected from one or more of the commercially available heavy alkylbenzene sulfonate (HABS), heavy aromatic petroleum sulfonate (HAPS), or fatty alcohol polyoxyethylene ether sulfonate (AESO). Alkylbenzene polyoxyethylene ether can be selected from one or more of the commercially available NP-4, NP-6, NP-9, etc. Fatty acid glycerides can be selected from one or more of the commercially available monoglyceride fatty acid esters, diglyceride fatty acid esters, triglyceride fatty acid esters, etc.

[0032] Unless otherwise specified, limestone powder and basalt were used as the ore powder and new aggregate in the following examples. Unless otherwise specified, the sources, compositions, and qualities of the same materials in different examples were consistent.

[0033] Example 1: Asphalt regeneration agent and modified regenerated asphalt mixture

[0034] The asphalt regeneration agent is made of the following materials: 28wt.% of asphalt oil, 10wt.% of BT plasticizer, 8wt.% of BH surfactant, 8wt.% of methyl long-chain alkyl silicone oil (VM-12 methyl long-chain alkyl silicone oil), 6wt.% of liquid polyvinyl acetate (EVA), 14wt.% of emulsion styrene-butadiene rubber, 10wt.% of liquid petroleum resin, 12wt.% of linear low-density polyethylene (LLDPE), 2wt.% of microcapsule stabilizer and 2wt.% of inducer Mxenes (MXene-Ti3AlC2). The line-cutting oil is a mixture of line-cutting oil and line-cutting oil in a mass ratio of 3:1. The BT plasticizer is a mixture of tall oil, pine tar, and epoxy fatty acid methyl ester in a mass ratio of 5:2:2. The BH surfactant is a mixture of the nonionic surfactant alkyl glucoside (dodecyl glucoside), petroleum sulfonate (HABS), alkylbenzene polyoxyethylene ether (NP-6), and fatty acid glyceride (monoglycerol fatty acid ester) in a mass ratio of 4:3:1:2. The microcapsule stabilizer is a mixture of sulfur, N-phenyl-N'-cyclohexyl-p-phenylenediamine, and ethylene bisstearamide. The sulfur and N-phenyl-N'-cyclohexyl-p-phenylenediamine serve as the microcapsule core material in a mass ratio of 3:1. The ethylene bisstearamide serves as the microcapsule wall material in a mass ratio of 6:4. Specifically, the mass ratio of ethylene bisstearamide to sulfur and N-phenyl-N'-cyclohexyl-p-phenylenediamine is 6:3:1.

[0035] The preparation method of asphalt regeneration agent is as follows:

[0036] 1) Heat the asphalt regeneration agent, BT plasticizer and methyl long carbon chain alkyl silicone oil to 120°C and premix them in a mixer for 5 minutes to obtain an asphalt regeneration agent premix;

[0037] 2) Liquid EVA, emulsion styrene-butadiene rubber, liquid petroleum resin, and LLDPE are sequentially added to the asphalt regeneration agent premix of step 1), and the mixture is sheared for 30 minutes to uniformly disperse the LLDPE particles, thereby obtaining an asphalt regeneration agent premix;

[0038] 3): The asphalt regeneration agent pre-sheared material of step 2) is transferred to the stirrer, and the microcapsule stabilizer and inducer MXenes are added. The stirring rate is 600r / min and the stirring time is 15min to obtain the asphalt regeneration agent microcapsule premix.

[0039] 4) Add BH surfactant to the asphalt regeneration agent microcapsule premix of step 3), keep the stirring rate of step 3) unchanged, and stir for 5 minutes to obtain the asphalt regeneration agent.

[0040] Ingredients of modified recycled asphalt mixture (gradation type is AC-20): the milling material content is 50wt.%, the asphalt regeneration agent content is 0.18wt.%, the SBS modified asphalt content is 1.87wt.%, the new aggregate content is 45.95wt.%, and the mineral powder content is 2wt.%.

[0041] Preparation of modified recycled asphalt mixture: Milled material was heated to 160°C using a microwave device. The asphalt regeneration agent from step 4) was sprayed into the mixture and mixed for 28 seconds. New aggregate was added and mixed for 50 seconds. SBS modified asphalt was then added and mixed for 50 seconds. Finally, mineral powder was added and mixed for 50 seconds at a mixing speed of 100 r / min to produce the modified recycled asphalt mixture. The new aggregate was preheated to 190°C before addition, and the SBS modified asphalt was preheated to 180°C before addition. The mixing temperature was controlled between 160°C and 190°C.

[0042] Example 2: An asphalt regeneration agent and modified regenerated asphalt mixture

[0043] The asphalt rejuvenator is made from the following materials: 31 wt.% of asphalt oil, 9 wt.% of BT plasticizer, 7 wt.% of BH surfactant, 6 wt.% of VM-12 methyl long-chain alkyl silicone oil, 12 wt.% of liquid EVA, 12 wt.% of emulsion styrene-butadiene rubber, 12 wt.% of liquid petroleum resin, 8 wt.% of LLDPE, 2 wt.% of microcapsule stabilizer, and 1 wt.% of MXenes (MXene-Ti3C2) as an initiator. The asphalt oil is a mixture of three-line oil and four-line oil in a mass ratio of 3:1; the BT plasticizer is a mixture of tall oil, pine tar, and epoxy fatty acid methyl ester in a mass ratio of 5:2:2; and the BH surfactant is a mixture of a nonionic surfactant, alkyl glucoside (undecyl glucoside), petroleum sulfonate (HAPS), alkylbenzene polyoxyethylene ether (NP-4), and fatty acid glyceride (triglyceride), in a mass ratio of 4:3:1:2. The microcapsule stabilizer is a mixture of sulfur, N-phenyl-N'-cyclohexyl-p-phenylenediamine, and ethylene bisstearamide. Sulfur and N-phenyl-N'-cyclohexyl-p-phenylenediamine are used as the microcapsule core material in a mass ratio of 3:2. Ethylene bisstearamide is used as the microcapsule wall material in a mass ratio of 5:5. Specifically, the mass ratio of ethylene bisstearamide to sulfur and N-phenyl-N'-cyclohexyl-p-phenylenediamine is 5:3:2.

[0044] The preparation method of asphalt regeneration agent is as follows:

[0045] 1) Heat the asphalt regeneration agent, BT plasticizer and methyl long carbon chain alkyl silicone oil to 130°C and premix them in a mixer for 3 minutes to obtain an asphalt regeneration agent premix;

[0046] 2) Liquid EVA, emulsion styrene-butadiene rubber, liquid petroleum resin, and LLDPE are sequentially added to the asphalt regeneration agent premix of step 1), and the mixture is sheared for 50 minutes to uniformly disperse the LLDPE particles, thereby obtaining an asphalt regeneration agent premix;

[0047] 3): The asphalt regeneration agent pre-sheared material of step 2) is transferred to the stirrer, and the microcapsule stabilizer and inducer MXenes are added. The stirring rate is 600r / min and the stirring time is 10min to obtain the asphalt regeneration agent microcapsule premix.

[0048] 4) Add BH surfactant to the asphalt regeneration agent microcapsule premix of step 3), keep the stirring rate of step 3) unchanged, and stir for 3 minutes to obtain the asphalt regeneration agent.

[0049] Ingredients of modified recycled asphalt mixture (gradation type is AC-20): the milling material content is 60wt.%, the asphalt regeneration agent content is 0.22wt.%, the SBS modified asphalt content is 1.38wt.%, the new aggregate content is 36.4wt.%, and the mineral powder content is 2wt.%.

[0050] Preparation of modified recycled asphalt mixture: The milled material is heated to 170°C by microwave equipment, and the asphalt regeneration agent in step 4) is sprayed in. Mix for 30 seconds, add new aggregate and mix for 50 seconds, then add SBS modified asphalt and mix for 50 seconds, and finally add mineral powder and mix for 50 seconds at a mixing speed of 100 r / min to obtain the modified recycled asphalt mixture. The new aggregate is preheated to 180°C before adding, and the SBS modified asphalt is preheated to 175°C before adding. The mixing temperature is controlled between 170°C and 180°C.

[0051] Example 3: An asphalt regeneration agent and modified regenerated asphalt mixture

[0052] The asphalt revitalizer is made from the following materials: 34 wt.% of asphalt oil, 7 wt.% of BT plasticizer, 5 wt.% of BH surfactant, 4 wt.% of VM-12 methyl long-chain alkyl silicone oil, 10 wt.% of liquid EVA, 16 wt.% of emulsion styrene-butadiene rubber, 14 wt.% of liquid petroleum resin, 6 wt.% of LLDPE, 1 wt.% of microcapsule stabilizer, and 3 wt.% of MXenes (MXene-Ti2C) as an initiator. The asphalt oil is a mixture of three-line and four-line oils in a 3:1 mass ratio. The BT plasticizer is a mixture of tall oil, pine tar, and epoxy fatty acid methyl ester in a 5:2:2 mass ratio. The BH surfactant is a mixture of a nonionic surfactant, alkyl glucoside (cetearyl glucoside), petroleum sulfonate (AESO), alkylbenzene polyoxyethylene ether (NP-6), and fatty acid glycerides (diglycerol fatty acid esters) in a 4:3:1:2 mass ratio. The microcapsule stabilizer is a mixture of sulfur, N-phenyl-N'-cyclohexyl-p-phenylenediamine, and ethylene bisstearamide. Sulfur and N-phenyl-N'-cyclohexyl-p-phenylenediamine are used as the microcapsule core material in a 1:1 mass ratio. Ethylene bisstearamide is used as the microcapsule wall material in a mass ratio of 8:2 to the core material. That is, the mass ratio of ethylene bisstearamide to sulfur and N-phenyl-N'-cyclohexyl-p-phenylenediamine is 8:1:1.

[0053] The preparation method of asphalt regeneration agent is as follows:

[0054] 1) Heat the asphalt regeneration agent, BT plasticizer and methyl long carbon chain alkyl silicone oil to 120°C and put them into a mixer for premixing for 4 minutes to obtain an asphalt regeneration agent premix;

[0055] 2) Liquid EVA, emulsion styrene-butadiene rubber, liquid petroleum resin, and LLDPE are sequentially added to the asphalt regeneration agent premix of step 1), and the mixture is sheared for 60 minutes to uniformly disperse the LLDPE particles, thereby obtaining an asphalt regeneration agent premix;

[0056] 3): The asphalt regeneration agent pre-sheared material of step 2) is transferred to the stirrer, and the microcapsule stabilizer and inducer MXenes are added. The stirring rate is 600r / min and the stirring time is 12min to obtain the asphalt regeneration agent microcapsule premix.

[0057] 4) Add BH surfactant to the asphalt regeneration agent microcapsule premix of step 3), keep the stirring rate of step 3) unchanged, and stir for 4 minutes to obtain the asphalt regeneration agent.

[0058] Ingredients of modified recycled asphalt mixture (gradation type is AC-20): the milling material content is 70wt.%, the asphalt regeneration agent content is 0.25wt.%, the SBS modified asphalt content is 0.9wt.%, the new aggregate content is 26.85wt.%, and the mineral powder content is 2wt.%.

[0059] Preparation of modified recycled asphalt mixture: Milled material was heated to 170°C using a microwave device. The asphalt regeneration agent from step 4) was sprayed into the mixture and mixed for 35 seconds. New aggregate was added and mixed for 45 seconds. SBS modified asphalt was then added and mixed for 45 seconds. Finally, mineral powder was added and mixed for 45 seconds at a mixing speed of 300 r / min to produce the modified recycled asphalt mixture. The new aggregate was preheated to 185°C before addition, and the SBS modified asphalt was preheated to 175°C before addition. The mixing temperature was controlled between 170°C and 185°C.

[0060] Example 4: An asphalt regeneration agent and modified regenerated asphalt mixture

[0061] The asphalt revitalizer is made from the following materials: 38 wt.% asphalt oil, 6 wt.% BT plasticizer, 4 wt.% BH surfactant, 4 wt.% methyl long carbon chain alkyl silicone oil (VM-12 methyl long carbon chain alkyl silicone oil), 8 wt.% liquid EVA, 12 wt.% emulsion styrene-butadiene rubber, 10 wt.% liquid petroleum resin, 14 wt.% LLDPE, 3 wt.% microcapsule stabilizer, and 1 wt.% MXenes (MXene-Ti3AlC2) inducer. The asphalt oil is a mixture of three-line asphalt oil and four-line asphalt oil in a mass ratio of 3:1; the BT plasticizer is a mixture of tall oil, pine tar, and epoxy fatty acid methyl ester in a mass ratio of 5:2:2; and the BH surfactant is a mixture of a nonionic surfactant alkyl glucoside (cetearyl glucoside), petroleum sulfonate (AESO), alkylbenzene polyoxyethylene ether (NP-9), and fatty acid glyceride (diglycerol fatty acid ester) in a mass ratio of 4:3:1:2. The microcapsule stabilizer is a mixture of sulfur, N-phenyl-N'-cyclohexyl-p-phenylenediamine, and ethylene bisstearamide. The sulfur and N-phenyl-N'-cyclohexyl-p-phenylenediamine serve as the microcapsule core material in a mass ratio of 3:0.5. Ethylene bisstearamide serves as the microcapsule wall material in a mass ratio of 3:7 to the core material. In other words, the mass ratio of ethylene bisstearamide to sulfur and N-phenyl-N'-cyclohexyl-p-phenylenediamine is 3:6:1.

[0062] The preparation method of asphalt regeneration agent is as follows:

[0063] 1) Heat the asphalt regeneration agent, BT plasticizer and methyl long carbon chain alkyl silicone oil to 130°C and premix them in a mixer for 5 minutes to obtain an asphalt regeneration agent premix;

[0064] 2) Liquid EVA, emulsion styrene-butadiene rubber, liquid petroleum resin, and LLDPE are sequentially added to the asphalt regeneration agent premix of step 1), and the mixture is sheared for 20 minutes to uniformly disperse the LLDPE particles, thereby obtaining an asphalt regeneration agent premix;

[0065] 3): The asphalt regeneration agent pre-sheared material of step 2) is transferred to the stirrer, and the microcapsule stabilizer and inducer MXenes are added. The stirring rate is 600r / min and the stirring time is 10min to obtain the asphalt regeneration agent microcapsule premix.

[0066] 4) Add BH surfactant to the asphalt regeneration agent microcapsule premix of step 3), keep the stirring rate of step 3) unchanged, and stir for 3 minutes to obtain the asphalt regeneration agent.

[0067] Ingredients of modified recycled asphalt mixture (gradation type is AC-20): the amount of milling material is 80wt.%, the amount of asphalt regeneration agent is 0.3wt.%, the amount of SBS modified asphalt is 0.9wt.%, the amount of new aggregate added is 16.8wt.%, and the amount of mineral powder added is 2wt.%.

[0068] Preparation of modified recycled asphalt mixture: Milled material was heated to 165°C using a microwave device. The asphalt regeneration agent from step 4) was sprayed into the mixture and mixed for 40 seconds. New aggregate was added and mixed for 40 seconds. SBS modified asphalt was added and mixed for 40 seconds. Finally, mineral powder was added and mixed for 40 seconds at a mixing speed of 200 r / min to produce the modified recycled asphalt mixture. The new aggregate was preheated to 185°C before addition, and the SBS modified asphalt was preheated to 180°C before addition. The mixing temperature was controlled between 165°C and 185°C.

[0069] Example 5: An asphalt regeneration agent and modified regenerated asphalt mixture

[0070] The difference from Example 2 is that the mass ratio of tall oil, pine tar, and epoxy fatty acid methyl ester in the BT plasticizer is 4:3:3; the mass ratio of the nonionic surfactant alkyl glucoside, petroleum sulfonate, alkylbenzene polyoxyethylene ether, and fatty acid glyceride in the BH surfactant is 3:3:2:2. Other components are the same as in Example 2.

[0071] Example 6: An asphalt regeneration agent and modified regenerated asphalt mixture

[0072] The difference from Example 2 is that the mass ratio of tall oil, pine tar, and epoxy fatty acid methyl ester in the BT plasticizer is 3:4:3; the mass ratio of the nonionic surfactant alkyl glucoside, petroleum sulfonate, alkylbenzene polyoxyethylene ether, and fatty acid glyceride in the BH surfactant is 2:4:2:2. Other components are the same as in Example 2.

[0073] Example 7: Asphalt regeneration agent and modified regenerated asphalt mixture

[0074] The difference from Example 2 is that the mass ratio of tall oil, pine tar, and epoxy fatty acid methyl ester in the BT plasticizer is 2:4:4; the mass ratio of the nonionic surfactant alkyl glucoside, petroleum sulfonate, alkylbenzene polyoxyethylene ether, and fatty acid glyceride in the BH surfactant is 1:4:2:3. Other components are the same as in Example 2.

[0075] Comparative Example 1: A modified recycled asphalt mixture

[0076] The difference from Example 4 is that the asphalt regeneration agent is replaced by the commercially available RA-1 regeneration agent with the same dosage.

[0077] Comparative Example 2: An Asphalt Regeneration Agent and Modified Regenerated Asphalt Mixture

[0078] The difference from Example 4 is that the asphalt regeneration agent of Example A1 of patent CN104788970A is used in the same dosage and is prepared according to the preparation process of Example A1 (the dosage of the asphalt regeneration agent is the same as that of Example 4).

[0079] Comparative Example 3: An Asphalt Regeneration Agent and Modified Regenerated Asphalt Mixture

[0080] The difference from Example 4 is that the microcapsule stabilizer is a mixture of sulfur, N-phenyl-N`-cyclohexyl-p-phenylenediamine, and low-melting point wax (No. 48 low-melting point paraffin wax); sulfur and N-phenyl-N`-cyclohexyl-p-phenylenediamine are used as microcapsule core materials in a mass ratio of 3:1; the low-melting point wax is used as the wall material of the microcapsule, and the mass ratio of the wall material to the core material is 5:5.

[0081] Comparative Example 4: An Asphalt Regeneration Agent and Modified Regenerated Asphalt Mixture

[0082] The difference from Example 4 is that: in step 3), no microcapsule stabilizer is added (i.e., the asphalt regeneration agent does not contain microcapsule stabilizer), but when the modified regenerated asphalt mixture is prepared, the milling material is heated to 165°C through a microwave device, and the asphalt regeneration agent and microcapsule stabilizer are sprayed in (i.e., the microcapsule stabilizer is added when the milling material is heated to 165°C).

[0083] Recycled modified asphalt is prepared according to the industry standard "Asphalt Concrete Regeneration Agent" (CJ-T554-2024) issued by the Ministry of Housing and Urban-Rural Development, and the asphalt regeneration agent dosage is 5%.

[0084] The properties of recycled modified asphalt and modified recycled asphalt mixture were measured according to the conventional method "Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011). The results are shown in Table 1.

[0085] Table 1 Test results of performance indicators of recycled modified asphalt and its modified recycled asphalt mixture

[0086]

[0087]

[0088] Note: Asphalt recovery was performed using a rotary evaporator method, and the Hamburg rutting tests were performed using a 60°C water bath.

[0089] Analysis of the above test results shows that the indicators of the recycled modified asphalt and modified recycled asphalt mixture prepared by the method of the present invention meet the use standards, and the indicators such as 5°C elongation, dynamic stability, low-temperature failure strain, residual strength ratio, number of wheel rollings, and wheel track depth exceed those of the comparative examples.

[0090] The asphalt rejuvenator of this invention has the advantages of low additive costs and allows for high addition rates of waste milling material (RAP), which helps improve the recycling rate of waste material. This is due to the core-shell structure formed by the wall material and the core material, which prevents premature cross-linking of the asphalt rejuvenator, thereby ensuring the asphalt rejuvenator's excellent permeability and modified regeneration effect.

[0091] It is obvious to those skilled in the art that the present invention is not limited to the above exemplary embodiments. Moreover, the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. In addition, it should be understood that although this specification is described in terms of implementation methods, not each implementation method represents only an independent technical solution. This description is only for the sake of clarity. Those skilled in the art should read the specification as a whole. The technical solutions in the various embodiments can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An asphalt regeneration agent, characterized in that: The material is made of the following materials by mass percentage: 25-40% of wire drawing oil, 5-12% of BT plasticizer, 3-10% of BH surfactant, 3-10% of methyl long carbon chain alkyl silicone oil, 5-15% of liquid EVA, 10-18% of emulsion styrene butadiene rubber, 10-16% of liquid petroleum resin, 5-15% of LLDPE, 1-3% of microcapsule stabilizer and MXenes. 1~3%; the line reduction oil is composed of line 3 reduction oil and line 4 reduction oil in a mass ratio of 3:1; the BT plasticizer is composed of tall oil, pine tar, and epoxy fatty acid methyl ester in a mass ratio of (2~5):(2~4):(2~4); the BH surfactant is composed of surfactant alkyl glucoside, petroleum sulfonate, alkylbenzene polyoxyethylene ether, and fatty acid glyceride in a mass ratio of (1~4):(3~4):(1~2):(2~3); the microcapsule stabilizer is composed of ethylene bisstearamide, sulfur, and N-phenyl-N'-cyclohexyl-p-phenylenediamine in a mass ratio of (3~8):(1~6):(1~2); the microcapsule stabilizer uses sulfur and N-phenyl-N'-cyclohexyl-p-phenylenediamine as core materials and ethylene bisstearamide as wall material; the preparation method of the asphalt regeneration agent comprises the following steps: S1: Heat the asphalt regeneration agent, BT plasticizer and methyl long carbon chain alkyl silicone oil to 120-130 ° C and premix for 3-5 minutes to obtain an asphalt regeneration agent premix; S2: adding liquid EVA, emulsion styrene-butadiene rubber, liquid petroleum resin, and LLDPE to the asphalt regeneration agent premix of step S1 in sequence, and shearing with a shearing machine for 20 to 60 minutes to obtain an asphalt regeneration agent pre-sheared material; S3: The asphalt regeneration agent pre-sheared material of step S2 was replaced under the stirrer, microcapsule stabilizer and MXenes were added, and stirred at 600r / min for 10~15min to obtain asphalt regeneration agent microcapsule premix; S4: Add BH surfactant to the asphalt regeneration agent microcapsule premix of step S3, keep the stirring rate of step S3 unchanged, and stir for 3 to 5 minutes to obtain the asphalt regeneration agent.

2. An asphalt regeneration agent according to claim 1, characterized in that: The mass ratio of ethylene bisstearamide, sulfur and N-phenyl-N'-cyclohexyl-p-phenylenediamine in the microcapsule stabilizer is selected from one of 3:6:1, 8:1:1, 5:3:2 and 6:3:

1.

3. The asphalt regeneration agent according to claim 1, characterized in that: The mass ratio of tall oil, pine tar, and epoxy fatty acid methyl ester in the BT plasticizer is selected from one of 5:2:2, 4:3:3, 3:4:3, and 2:4:4; the mass ratio of surfactant alkyl glucoside, petroleum sulfonate, alkylbenzene polyoxyethylene ether, and fatty acid glyceride in the BH surfactant is selected from one of 4:3:1:2, 3:3:2:2, 2:4:2:2, and 1:4:2:

3.

4. The asphalt regeneration agent according to claim 1, characterized in that: The MXenes are selected from one or more of MXene-Ti3AlC2, MXene-Ti3C2, and MXene-Ti2C; the alkyl glucoside is selected from one or more of dodecyl glucoside, undecyl glucoside, or cetearyl glucoside; the petroleum sulfonate is selected from one or more of heavy alkylbenzene sulfonate, heavy aromatic petroleum sulfonate, or fatty alcohol polyoxyethylene ether sulfonate; and the fatty acid glyceride is selected from one or more of monoglyceride fatty acid ester, diglyceride fatty acid ester, and triglyceride fatty acid ester.

5. A modified regenerated asphalt mixture prepared using the asphalt regeneration agent according to claim 1, characterized in that: The modified recycled asphalt mixture is made of the following materials by mass percentage: 40-82% of milling material, 0.15-0.5% of asphalt regeneration agent, 0.8-2% of SBS modified asphalt, 15-50% of new aggregate, and 1-2% of mineral powder.

6. A method for preparing the modified recycled asphalt mixture according to claim 5, characterized in that: The steps include: Z1: Heat the milling material to 160-170℃, spray the asphalt regeneration agent into it, and mix it for 25-40 seconds to obtain the old asphalt-regeneration agent mixture; Z2: Add the preheated new aggregate and SBS modified asphalt to the old asphalt-regeneration agent mixture in step Z1 in sequence, then add the mineral powder and mix at 100-300 r / min.

7. The method for preparing the modified recycled asphalt mixture according to claim 6, characterized in that: In step Z2, the preheating temperatures of the new aggregate and the SBS modified asphalt are 180-190° C. and 175-180° C. respectively.

8. The method for preparing the modified recycled asphalt mixture according to claim 6, characterized in that: In step Z2, the new aggregate is added and the mixture is mixed for 30 to 50 seconds, the SBS modified asphalt is added and the mixture is mixed for 30 to 50 seconds, and the mineral powder is added and the mixture is mixed for 30 to 50 seconds.

9. Use of the asphalt regeneration agent according to any one of claims 1 to 4 as a recycling and regeneration agent for waste milling materials.

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