High-permeability asphalt pavement recycling agent and preparation method thereof

Abstract

The application discloses a high-permeability asphalt pavement regenerating agent and a preparation method thereof, and relates to the technical field of asphalt pavement maintenance. Raw materials of the high-permeability asphalt pavement regenerating agent include 15-25 parts of emulsified asphalt, 20-30 parts of furfural extract oil, 15-25 parts of naphthenic rubber oil, 10-18 parts of 200# solvent oil, 8-15 parts of epoxy soybean oil, 3-8 parts of modified nano silicon dioxide, 2-6 parts of a plasticizer, 0.5-3 parts of a hydroxyl sulfobetaine Gemini surfactant, 0.3-1.5 parts of an antioxidant, 0.2-0.5 parts of an anti-stripping agent, 2-5 parts of a curing agent and 0.05-0.1 parts of a defoaming agent. The raw materials are sequentially added into a stirring kettle, and are stirred at 500-600 rpm for 30-60 minutes, so that the asphalt pavement regenerating agent is obtained. The asphalt pavement regenerating agent has excellent permeability, can significantly improve a penetration recovery rate, obviously reduce a softening point and significantly improve a ductility.

Description

Technical Field

[0001] This application relates to the field of asphalt pavement maintenance technology, and in particular to a high-penetration asphalt pavement regenerator and its preparation method. Background Technology

[0002] After asphalt pavement is built, due to the long-term effects of vehicle load, wear and tear and natural climate, asphalt will gradually age, its performance will deteriorate, and various defects such as pavement cracks, potholes, ruts, loosening, water seepage, pitting, and insufficient skid resistance will gradually appear.

[0003] Current technologies for treating asphalt aging involve mixing materials and additives containing significant amounts of asphalt aromatics in a specific ratio, allowing them to penetrate into the aged asphalt pavement. However, traditional asphalt pavement recycling agents often use single light oil components as softeners, reducing the viscosity of aged asphalt through physical dilution. These components are highly volatile and have low flash points, leading to significant environmental pollution and safety hazards during construction. Furthermore, they evaporate quickly after penetration, causing secondary hardening, cracking, and other re-aging phenomena in the recycled pavement within 2-3 years. While emulsified recycling agents improve construction safety, they suffer from poor emulsion stability, short shelf life, and rapid demulsification. Their penetration depth is typically less than 10mm, making it difficult to effectively repair aged asphalt in the intermediate layer and below. Summary of the Invention

[0004] In order to provide an asphalt pavement recycling agent with high penetration, this application provides a high-penetration asphalt pavement recycling agent and its preparation method.

[0005] This application provides a high-penetration asphalt pavement recycling agent, which adopts the following technical solution:

[0006] A high-penetration asphalt pavement recycling agent, the raw materials by weight include 15-25 parts emulsified asphalt, 20-30 parts furfural extract oil, 15-25 parts naphthenic rubber oil, 10-18 parts 200# solvent oil, 8-15 parts epoxidized soybean oil, 3-8 parts modified nano silica, 2-6 parts plasticizer, 0.5-3 parts hydroxysulfonated quaternary ammonium salt Gemini surfactant, 0.3-1.5 parts antioxidant, 0.2-0.5 parts anti-stripping agent, 2-5 parts curing agent, and 0.05-0.1 parts defoamer.

[0007] Preferably, the raw materials include, by weight, 20 parts emulsified asphalt, 25 parts furfural extracted oil, 20 parts naphthenic rubber oil, 14 parts 200# solvent oil, 12 parts epoxidized soybean oil, 6 parts modified nano silica, 4 parts plasticizer, 2 parts hydroxysulfonated quaternary ammonium salt Gemini surfactant, 0.9 parts antioxidant, 0.3 parts anti-stripping agent, 3.5 parts curing agent, and 0.075 parts defoamer.

[0008] Preferably, the emulsified asphalt is prepared by adding water to No. 90 asphalt and a high-penetration emulsifier, and has a solid content of 60-75%.

[0009] Preferably, the modified nano-silica is prepared from the following raw materials in parts by weight: 13-26 parts zinc-aluminum layered double hydroxide, 60-120 parts deionized water, 2.1-4.2 parts sodium dodecylbenzenesulfonate, 14.2-28.4 parts water glass, and 30-60 parts ethanol.

[0010] Preferably, the zinc-aluminum layered double hydroxide is prepared from the following raw materials in parts by weight: 30-45 parts zinc nitrate hexahydrate, 19-28.5 parts aluminum nitrate nonahydrate, 170-260 parts deionized water, 14-21 parts sodium hydroxide, and 10-15 parts anhydrous sodium carbonate.

[0011] Preferably, the method for preparing the zinc-aluminum layered double hydroxide includes the following steps:

[0012] Add 30-45 parts of zinc nitrate hexahydrate and 19-28.5 parts of aluminum nitrate nonahydrate to 70-110 parts of deionized water and stir until completely dissolved to obtain solution a; add 14-21 parts of sodium hydroxide and 10-15 parts of anhydrous sodium carbonate to 100-150 parts of deionized water and stir until completely dissolved to obtain solution b; add solution a dropwise to solution b under stirring, and then stir the reaction at 65-75℃ for 12-16 h; then let stand for 12-16 h, wash the resulting slurry with deionized water and anhydrous ethanol in sequence, centrifuge, and dry the centrifuged solid product at 60-70℃ for 24-30 h to obtain zinc-aluminum layered double hydroxide.

[0013] Preferably, the method for preparing the modified nano-silica includes the following steps:

[0014] Add 13-26 parts of zinc-aluminum layered double hydroxide to 60-120 parts of deionized water, stir evenly, then add 2.1-4.2 parts of sodium dodecylbenzenesulfonate, and continue stirring for 1-2 hours; then add 14.2-28.4 parts of water glass, stir for 1-3 hours, then add 30-60 parts of ethanol, and age at 80-90℃ for 2-3 hours, then adjust the pH of the mixed solution to 5-6; continue the reaction for 1-2 hours, and age for 2-3 hours; wash the product with deionized water and anhydrous ethanol, centrifuge, and dry the centrifuged solid product at 60-70℃ for 24-30 hours to obtain modified nano-silica.

[0015] Preferably, the hydroxysulfonyl quaternary ammonium salt Gemini surfactant is prepared from the following raw materials in parts by weight: 2-3 parts sodium 3-chloro-2-hydroxypropanesulfonate, 35-70 parts anhydrous ethanol, 15-30 parts deionized water, 2.7-4 parts hexadecyl dimethyl tertiary amine, 0.9-1.4 parts 1,2-dibromoethane, 2.5-5 parts dodecyl chloride, and 50-100 parts acetone.

[0016] Preferably, the preparation method of the hydroxysulfonyl quaternary ammonium salt Gemini surfactant includes the following steps:

[0017] Add 2-3 parts of sodium 3-chloro-2-hydroxypropanesulfonate to a mixed solution of 35-70 parts anhydrous ethanol and 15-30 parts deionized water, and heat and stir until completely dissolved. Add 2.7-4 parts of hexadecyl dimethyl tertiary amine, and react at 80-90℃ for 3-5 hours, maintaining the pH of the system at 9-10. Then add 0.9-1.4 parts of 1,2-dibromoethane dropwise, stirring continuously, and continue the reaction at 80-90℃ for 24-28 hours. After cooling, add 2.5-5 parts of a mixed solution of dodecyl chloride and 50-100 parts of acetone dropwise under ice bath conditions, stirring until homogeneous. Maintain the pH of the system at 9-10. After the addition is complete, raise the temperature to 20-30℃ and continue the reaction for 2-3 hours. Then wash several times with acetone and recrystallize several times with anhydrous ethanol. After drying, the hydroxysulfonyl quaternary ammonium salt Gemini surfactant is obtained.

[0018] This application provides a method for preparing a high-penetration asphalt pavement recycling agent, which adopts the following technical solution:

[0019] A method for preparing a high-penetration asphalt pavement recycling agent includes the following steps:

[0020] Add 15-25 parts emulsified asphalt, 20-30 parts furfural extracted oil, 15-25 parts naphthenic rubber oil, 10-18 parts 200# solvent oil, 8-15 parts epoxidized soybean oil, 3-8 parts modified nano silica, 2-6 parts plasticizer, 0.5-3 parts hydroxysulfonated quaternary ammonium salt Gemini surfactant, 0.3-1.5 parts antioxidant, 0.2-0.5 parts anti-stripping agent, 2-5 parts curing agent, and 0.05-0.1 parts defoamer to a mixing tank in sequence, and stir at 500-600 rpm for 30-60 minutes to obtain asphalt pavement recycling agent.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. This application uses hydroxysulfonyl quaternary ammonium salt Gemini surfactant as the core penetrant. Its double-chain, double-headed structure can significantly reduce interfacial tension. Combined with the layered structure of nano-modified silica, it enhances the penetration pathway, achieving deep repair of aged asphalt. Furfural extracted oil and naphthenic rubber oil synergistically supplement the light components, dissolve asphalt aggregates, restore the colloidal stability of asphalt, significantly improve the penetration recovery rate, significantly reduce the softening point, and significantly improve ductility. Detailed Implementation

[0023] The present application will be further described in detail below with reference to the embodiments.

[0024] The chemical reagents used in the preparation examples, embodiments, and comparative examples provided in this invention are all commercially available products, and their brands and manufacturers are as follows:

[0025] Water glass, 40% by mass, Wuhan Jiyesheng Chemical Co., Ltd.

[0026] Hexadecyl dimethyl tertiary amine, Shanghai Yi'en Chemical Technology Co., Ltd., Product No.: R001189;

[0027] Ladecyl chloride, Shanghai Maclean Biochemical Technology Co., Ltd., Product No.: D807294;

[0028] Epoxidized soybean oil, Shanghai Maclean Biochemical Technology Co., Ltd., Product No.: E808876;

[0029] Epoxy fatty acid methyl ester, Shandong Xiya Chemical Co., Ltd., Product No.: 296680;

[0030] N-Cocoyl-1,3-Propanediamine, Shanghai Maclean Biochemical Technology Co., Ltd., Product No.: N889744, Purity: Total amides: 375-450 mg / g;

[0031] Polyetheramine D-230, Shanghai Yi'en Chemical Technology Co., Ltd., Product No.: PB044721, Product No.: R054755, Purity: average Mn-230.

[0032] Preparation Example 1: Preparation of Modified Nano-Silica

[0033] Preparation Example 1.1

[0034] S1. Add 30g of zinc nitrate hexahydrate and 19g of aluminum nitrate nonahydrate to 70g of deionized water and stir until completely dissolved to obtain solution a; add 14g of sodium hydroxide and 10g of anhydrous sodium carbonate to 100g of deionized water and stir until completely dissolved to obtain solution b; slowly add solution a to solution b under stirring, and then stir the reaction at 65℃ for 12h; then let it stand for 12h, wash the resulting slurry three times with deionized water and anhydrous ethanol, centrifuge, and dry the solid product after centrifugation at 60℃ for 24h to obtain zinc-aluminum layered double hydroxide;

[0035] S2. Add 13g of the zinc-aluminum layered double hydroxide prepared in S1 to 60g of deionized water, stir evenly, then add 2.1g of sodium dodecylbenzenesulfonate and continue stirring for 1h; then add 14.2g of 40% water glass, stir for 1h, then add 30g of ethanol, age at 80℃ for 2h, then adjust the pH of the mixed solution to 6 with 1mol / L citric acid solution; continue the reaction for 1h, and age for 2h; wash the product three times with deionized water and anhydrous ethanol, centrifuge, and dry the centrifuged solid product at 60℃ for 24h to obtain modified nano silica.

[0036] Preparation Example 1.2

[0037] S1. Add 37.5g of zinc nitrate hexahydrate and 23.75g of aluminum nitrate nonahydrate to 90g of deionized water and stir until completely dissolved to obtain solution a; add 17.5g of sodium hydroxide and 12.5g of anhydrous sodium carbonate to 125g of deionized water and stir until completely dissolved to obtain solution b; slowly add solution a to solution b under stirring, and then stir the reaction at 70℃ for 14h; then let stand for 14h, wash the resulting slurry four times with deionized water and anhydrous ethanol, centrifuge, and dry the solid product after centrifugation at 65℃ for 27h to obtain zinc-aluminum layered double hydroxide;

[0038] S2. Add 19.5g of the zinc-aluminum layered double hydroxide prepared in S1 to 90g of deionized water, stir evenly, then add 3.15g of sodium dodecylbenzenesulfonate and continue stirring for 1.5h; then add 21.3g of 40% water glass, stir for 2h, then add 45g of ethanol, and age at 85℃ for 2.5h. Then adjust the pH of the mixed solution to 5.5 with 1mol / L citric acid solution; continue the reaction for 1.5h, and age for 2.5h; wash the product four times with deionized water and anhydrous ethanol, centrifuge, and dry the centrifuged solid product at 65℃ for 27h to obtain modified nano-silica.

[0039] Preparation Example 1.3

[0040] S1. Add 45g of zinc nitrate hexahydrate and 28.5g of aluminum nitrate nonahydrate to 110g of deionized water and stir until completely dissolved to obtain solution a; add 21g of sodium hydroxide and 15g of anhydrous sodium carbonate to 150g of deionized water and stir until completely dissolved to obtain solution b; slowly add solution a to solution b under stirring, and then stir the reaction at 75℃ for 16h; then let it stand for 16h, wash the resulting slurry five times with deionized water and anhydrous ethanol, centrifuge, and dry the solid product after centrifugation at 70℃ for 30h to obtain zinc-aluminum layered double hydroxide;

[0041] S2. Add 26g of the zinc-aluminum layered double hydroxide prepared in S1 to 120g of deionized water, stir evenly, then add 4.2g of sodium dodecylbenzenesulfonate and continue stirring for 3h; then add 28.4g of 40% water glass, stir for 3h, then add 60g of ethanol, age at 90℃ for 3h, then adjust the pH of the mixed solution to 5 with 1mol / L citric acid solution; continue the reaction for 2h, then age for 3h; wash the product 5 times with deionized water and anhydrous ethanol, centrifuge, and dry the centrifuged solid product at 70℃ for 30h to obtain modified nano silica.

[0042] Preparation Example 2: Preparation of Gemini surfactants containing hydroxysulfonyl quaternary ammonium salts

[0043] Preparation Example 2.1

[0044] 2 g of sodium 3-chloro-2-hydroxypropanesulfonate was added to a mixed solution of 35 g anhydrous ethanol and 15 g deionized water, and heated and stirred until completely dissolved. 2.7 g of hexadecyl dimethyl tertiary amine was added, and the reaction was carried out at 80 °C for 3 h, maintaining the pH of the system at 9. Subsequently, 0.9 g of 1,2-dibromoethane was added dropwise, and the mixture was stirred continuously at 80 °C for another 24 h. After cooling, a mixed solution of 2.5 g dodecyl chloride and 50 g acetone was added dropwise under ice bath conditions, and stirred until homogeneous. The pH of the system was maintained at 9. After the addition was completed, the temperature was raised to 20 °C, and the reaction was carried out for another 2 h. The mixture was then washed three times with acetone and recrystallized twice with anhydrous ethanol. After drying at 60 °C, the hydroxysulfonyl quaternary ammonium salt Gemini surfactant was obtained.

[0045] Preparation Example 2.2

[0046] 2.5 g of sodium 3-chloro-2-hydroxypropanesulfonate was added to a mixed solution of 52.5 g anhydrous ethanol and 22.5 g deionized water, and heated and stirred until completely dissolved. 3.35 g of hexadecyl dimethyl tertiary amine was added, and the reaction was carried out at 85 °C for 4 h, maintaining the pH of the system at 9.5. Then, 1.15 g of 1,2-dibromoethane was added dropwise, and the reaction was continued at 85 °C for 26 h with continuous stirring. After cooling, a mixed solution of 3.75 g dodecyl chloride and 75 g acetone was added dropwise under ice bath conditions, and stirred until homogeneous. The pH of the system was maintained at 9.5. After the addition was completed, the temperature was raised to 25 °C, and the reaction was continued for 2.5 h. The product was then washed four times with acetone and recrystallized three times with anhydrous ethanol. After drying at 65 °C, the hydroxysulfonyl quaternary ammonium salt Gemini surfactant was obtained.

[0047] Preparation Example 2.3

[0048] 3 g of sodium 3-chloro-2-hydroxypropanesulfonate was added to a mixed solution of 70 g anhydrous ethanol and 30 g deionized water, and heated and stirred until completely dissolved. 4 g of hexadecyl dimethyl tertiary amine was added, and the reaction was carried out at 90 °C for 5 h while maintaining the pH of the system at 10. Then, 1.4 g of 1,2-dibromoethane was added dropwise, and the mixture was stirred continuously at 90 °C for another 28 h. After cooling, a mixed solution of 5 g dodecyl chloride and 100 g acetone was added dropwise under ice bath conditions, and stirred until homogeneous. The pH of the system was maintained at 10. After the addition was completed, the temperature was raised to 30 °C, and the reaction was carried out for another 3 h. The mixture was then washed 5 times with acetone and recrystallized 4 times with anhydrous ethanol. After drying at 70 °C, the hydroxysulfonyl quaternary ammonium salt Gemini surfactant was obtained.

[0049] Example 1

[0050] 15g emulsified asphalt, 20g furfural extract oil, 15g naphthenic rubber oil, 10g 200# solvent oil, 8g epoxidized soybean oil, 3g modified nano silica prepared in Preparation Example 1.1, 2g plasticizer, 0.5g hydroxysulfonyl quaternary ammonium salt Gemini surfactant prepared in Preparation Example 2.1, 0.3g antioxidant, 0.2g anti-stripping agent, 2g curing agent, and 0.05g defoamer were sequentially added to a mixing tank and stirred at 500 rpm for 30 minutes to obtain asphalt pavement recycling agent;

[0051] In this embodiment, the emulsified asphalt is prepared by using 59.4% by mass of No. 90 asphalt, 0.6% by mass of high-penetration emulsifier cetyltrimethylammonium bromide, and 40% by mass of water, with a solid content of 60%.

[0052] The plasticizer used is epoxy fatty acid methyl ester;

[0053] Antioxidants include antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2;

[0054] The anti-stripping agent is N-cocoyl-1,3-propylene diamine;

[0055] The curing agent used is polyetheramine D-230;

[0056] The defoamer used is BYK-024 defoamer.

[0057] Example 2

[0058] 20g emulsified asphalt, 25g furfural extract oil, 20g naphthenic rubber oil, 14g 200# solvent oil, 12g epoxidized soybean oil, 6g modified nano silica prepared in Preparation Example 1.1, 4g plasticizer, 2g hydroxysulfonyl quaternary ammonium salt Gemini surfactant prepared in Preparation Example 2.1, 0.9g antioxidant, 3.5g curing agent, 0.3g anti-stripping agent, and 0.075g defoamer were sequentially added to a mixing tank and stirred at 500 rpm for 30 minutes to obtain asphalt pavement recycling agent;

[0059] In this embodiment, the emulsified asphalt is prepared by using 59.4% by mass of No. 90 asphalt, 0.6% by mass of high-penetration emulsifier cetyltrimethylammonium bromide, and 40% by mass of water, with a solid content of 60%.

[0060] The plasticizer used is epoxy fatty acid methyl ester;

[0061] Antioxidants include antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2;

[0062] The anti-stripping agent is N-cocoyl-1,3-propylene diamine;

[0063] The curing agent used is polyetheramine D-230;

[0064] The defoamer used is BYK-024 defoamer.

[0065] Example 3

[0066] 25g emulsified asphalt, 30g furfural extract oil, 25g naphthenic rubber oil, 18g 200# solvent oil, 15g epoxidized soybean oil, 8g modified nano silica prepared in Preparation Example 1.1, 6g plasticizer, 3g hydroxysulfonyl quaternary ammonium salt Gemini surfactant prepared in Preparation Example 2.1, 1.5g antioxidant, 0.5g anti-stripping agent, 5g curing agent, and 0.1g defoamer were sequentially added to a mixing tank and stirred at 500 rpm for 30 minutes to obtain asphalt pavement recycling agent;

[0067] In this embodiment, the emulsified asphalt is prepared by using 59.4% by mass of No. 90 asphalt, 0.6% by mass of high-penetration emulsifier cetyltrimethylammonium bromide, and 40% by mass of water, with a solid content of 60%.

[0068] The plasticizer used is epoxy fatty acid methyl ester;

[0069] Antioxidants include antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2;

[0070] The anti-stripping agent is N-cocoyl-1,3-propylene diamine;

[0071] The curing agent used is polyetheramine D-230;

[0072] The defoamer used is BYK-024 defoamer.

[0073] Example 4

[0074] 15g emulsified asphalt, 20g furfural extract oil, 15g naphthenic rubber oil, 10g 200# solvent oil, 8g epoxidized soybean oil, 3g modified nano silica prepared in Preparation Example 1.2, 2g plasticizer, 0.5g hydroxysulfonyl quaternary ammonium salt Gemini surfactant prepared in Preparation Example 2.2, 0.3g antioxidant, 0.2g anti-stripping agent, 2g curing agent, and 0.05g defoamer were sequentially added to a mixing tank and stirred at 550 rpm for 45 minutes to obtain asphalt pavement recycling agent;

[0075] In this embodiment, the emulsified asphalt is prepared by using 64.3% by mass of No. 90 asphalt, 0.7% by mass of high-penetration emulsifier cetyltrimethylammonium bromide, and 40% by mass of water, with a solid content of 65%.

[0076] The plasticizer used is epoxy fatty acid methyl ester;

[0077] Antioxidants include antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2;

[0078] The anti-stripping agent is N-cocoyl-1,3-propylene diamine;

[0079] The curing agent used is polyetheramine D-230;

[0080] The defoamer used is BYK-024 defoamer.

[0081] Example 5

[0082] 15g emulsified asphalt, 20g furfural extract oil, 15g naphthenic rubber oil, 10g 200# solvent oil, 8g epoxidized soybean oil, 3g modified nano silica prepared in Preparation Example 1.3, 2g plasticizer, 0.5g hydroxysulfonyl quaternary ammonium salt Gemini surfactant prepared in Preparation Example 2.3, 0.3g antioxidant, 0.2g anti-stripping agent, 2g curing agent, and 0.05g defoamer were sequentially added to a mixing tank and stirred at 600 rpm for 60 minutes to obtain asphalt pavement recycling agent;

[0083] In this embodiment, the emulsified asphalt is prepared by using 74.2% by mass of No. 90 asphalt, 0.8% by mass of high-penetration emulsifier cetyltrimethylammonium bromide, and 35% by mass of water, with a solid content of 25%.

[0084] The plasticizer used is epoxy fatty acid methyl ester;

[0085] Antioxidants include antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2;

[0086] The anti-stripping agent is N-cocoyl-1,3-propylene diamine;

[0087] The curing agent used is polyetheramine D-230;

[0088] The defoamer used is BYK-024 defoamer.

[0089] Comparative Example 1

[0090] The difference between Comparative Example 1 and Example 1 is that an equal amount of unmodified nano-silica was used in Comparative Example 1 instead of the modified nano-silica prepared in Preparation Example 1.1.

[0091] Comparative Example 2

[0092] The difference between Comparative Example 2 and Example 1 is that an equal amount of commercially available Gemini surfactant was used in Comparative Example 2 instead of the hydroxysulfonyl quaternary ammonium salt Gemini surfactant prepared in Preparation Example 2.1; the commercially available Gemini surfactant was purchased from Wuhan Camick Technology Co., Ltd.

[0093] Performance testing

[0094] Take 500g of unaged 90# base asphalt, labeled as a standard sample, and test its penetration at 25℃ (93.4mm), ductility at 15℃ (>100cm), and softening point (41℃). Take 500g of each of 7 samples of 90# base asphalt aged for 85 minutes. Add 15g each of the asphalt pavement curing agents prepared in Examples 1-5 and Comparative Examples 1-2 to the samples. After thorough stirring at room temperature, perform the following tests: penetration depth of the penetrating agent after 24 hours; asphalt penetration: T0604-2000; ductility: T0605-1993; and softening point: T0606-2000. The test results are shown in Table 1.

[0095] The specific test results are as follows:

[0096] Table 1 Performance Test Results

[0097]

[0098] As can be seen from the test results in Table 1, the asphalt pavement recycling agent provided in this application has significant changes in penetration, ductility and softening point after being added to aged asphalt, and the penetration depth reaches 4-5.3 cm in 24 hours; indicating that the asphalt pavement recycling agent provided in this application has high permeability and can increase penetration and ductility while reducing softening point.

[0099] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-penetration asphalt pavement recycling agent, characterized in that: The raw materials, by weight, include 15-25 parts emulsified asphalt, 20-30 parts furfural extracted oil, 15-25 parts naphthenic rubber oil, 10-18 parts 200# solvent oil, 8-15 parts epoxidized soybean oil, 3-8 parts modified nano silica, 2-6 parts plasticizer, 0.5-3 parts hydroxysulfonated quaternary ammonium salt Gemini surfactant, 0.3-1.5 parts antioxidant, 0.2-0.5 parts anti-stripping agent, 2-5 parts curing agent, and 0.05-0.1 parts defoamer.

2. The high-penetration asphalt pavement recycling agent according to claim 1, characterized in that: The raw materials, by weight, include 20 parts emulsified asphalt, 25 parts furfural extracted oil, 20 parts naphthenic rubber oil, 14 parts 200# solvent oil, 12 parts epoxidized soybean oil, 6 parts modified nano silica, 4 parts plasticizer, 2 parts hydroxysulfonated quaternary ammonium salt Gemini surfactant, 0.9 parts antioxidant, 0.3 parts anti-stripping agent, 3.5 parts curing agent, and 0.075 parts defoamer.

3. The high-penetration asphalt pavement recycling agent according to claim 1, characterized in that: The emulsified asphalt is made from No. 90 asphalt, high-penetration emulsifier and water, with a solid content of 60-75%.

4. The high-penetration asphalt pavement recycling agent according to claim 1, characterized in that: The modified nano-silica is prepared from the following raw materials in parts by weight: 13-26 parts zinc-aluminum layered double hydroxide, 60-120 parts deionized water, 2.1-4.2 parts sodium dodecylbenzenesulfonate, 14.2-28.4 parts water glass, and 30-60 parts ethanol.

5. The high-penetration asphalt pavement recycler according to claim 4, characterized in that: The zinc-aluminum layered double hydroxide is prepared from the following raw materials in parts by weight: 30-45 parts zinc nitrate hexahydrate, 19-28.5 parts aluminum nitrate nonahydrate, 170-260 parts deionized water, 14-21 parts sodium hydroxide, and 10-15 parts anhydrous sodium carbonate.

6. The high-penetration asphalt pavement recycling agent according to claim 5, characterized in that: The method for preparing the zinc-aluminum layered double hydroxide includes the following steps: Add 30-45 parts of zinc nitrate hexahydrate and 19-28.5 parts of aluminum nitrate nonahydrate to 70-110 parts of deionized water and stir until completely dissolved to obtain solution a; add 14-21 parts of sodium hydroxide and 10-15 parts of anhydrous sodium carbonate to 100-150 parts of deionized water and stir until completely dissolved to obtain solution b; add solution a dropwise to solution b under stirring, and then stir the reaction at 65-75℃ for 12-16 h; then let stand for 12-16 h, wash the resulting slurry with deionized water and anhydrous ethanol in sequence, centrifuge, and dry the centrifuged solid product at 60-70℃ for 24-30 h to obtain zinc-aluminum layered double hydroxide.

7. The high-penetration asphalt pavement recycler according to claim 4, characterized in that: The method for preparing the modified nano-silica includes the following steps: Add 13-26 parts of zinc-aluminum layered double hydroxide to 60-120 parts of deionized water, stir evenly, then add 2.1-4.2 parts of sodium dodecylbenzenesulfonate, and continue stirring for 1-2 hours; then add 14.2-28.4 parts of water glass, stir for 1-3 hours, then add 30-60 parts of ethanol, and age at 80-90℃ for 2-3 hours, then adjust the pH of the mixed solution to 5-6; continue the reaction for 1-2 hours, and age for 2-3 hours; wash the product with deionized water and anhydrous ethanol, centrifuge, and dry the centrifuged solid product at 60-70℃ for 24-30 hours to obtain modified nano-silica.

8. The high-penetration asphalt pavement recycling agent according to claim 1, characterized in that: The hydroxysulfonyl quaternary ammonium salt Gemini surfactant is prepared from the following raw materials in parts by weight: 2-3 parts sodium 3-chloro-2-hydroxypropanesulfonate, 35-70 parts anhydrous ethanol, 15-30 parts deionized water, 2.7-4 parts hexadecyl dimethyl tertiary amine, 0.9-1.4 parts 1,2-dibromoethane, 2.5-5 parts dodecyl chloride, and 50-100 parts acetone.

9. The high-penetration asphalt pavement recycling agent and its preparation method according to claim 1, characterized in that: The preparation method of the hydroxysulfonyl quaternary ammonium salt Gemini surfactant includes the following steps: Add 2-3 parts of sodium 3-chloro-2-hydroxypropanesulfonate to a mixed solution of 35-70 parts anhydrous ethanol and 15-30 parts deionized water, and heat and stir until completely dissolved. Add 2.7-4 parts of hexadecyl dimethyl tertiary amine, and react at 80-90℃ for 3-5 hours, maintaining the pH of the system at 9-10. Then add 0.9-1.4 parts of 1,2-dibromoethane dropwise, stirring continuously, and continue the reaction at 80-90℃ for 24-28 hours. After cooling, add 2.5-5 parts of a mixed solution of dodecyl chloride and 50-100 parts of acetone dropwise under ice bath conditions, stirring until homogeneous. Maintain the pH of the system at 9-10. After the addition is complete, raise the temperature to 20-30℃ and continue the reaction for 2-3 hours. Then wash several times with acetone and recrystallize several times with anhydrous ethanol. After drying, the hydroxysulfonyl quaternary ammonium salt Gemini surfactant is obtained.

10. A method for preparing a high-penetration asphalt pavement recycling agent according to any one of claims 1-9, characterized in that: Includes the following steps: Add 15-25 parts emulsified asphalt, 20-30 parts furfural extracted oil, 15-25 parts naphthenic rubber oil, 10-18 parts 200# solvent oil, 8-15 parts epoxidized soybean oil, 3-8 parts modified nano silica, 2-6 parts plasticizer, 0.5-3 parts hydroxysulfonated quaternary ammonium salt Gemini surfactant, 0.3-1.5 parts antioxidant, 0.2-0.5 parts anti-stripping agent, 2-5 parts curing agent, and 0.05-0.1 parts defoamer to a mixing tank in sequence, and stir at 500-600 rpm for 30-60 minutes to obtain asphalt pavement recycling agent.

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