Waterborne epoxy emulsified asphalt as well as preparation method and application thereof

Abstract

The invention discloses waterborne epoxy emulsified asphalt as well as a preparation method and application thereof, and belongs to the technical field of pavement materials, the waterborne epoxy emulsified asphalt comprises the following raw materials: emulsified asphalt, waterborne epoxy resin, a curing agent, a polymerization inhibitor and a coupling agent; the curing agent comprises a curing agent core layer and an inorganic nano-material shell layer, and polyethylene oxide is grafted on the surface of the inorganic nano-material shell layer through cellulose nanocrystals. The curing agent is wrapped in the inner core through the inorganic nano material shell layer, and meanwhile, a rigid framework is provided through the cellulose nanocrystals, so that the mechanical strength of the shell layer is improved, and self-curing of the waterborne epoxy emulsified asphalt caused by shell layer breakage in the transportation or storage process is prevented; the polyethylene oxide can improve the compatibility with the emulsified asphalt through hydrogen bonds and chain entanglement, prevent demulsification of the emulsified asphalt and improve the stability of a waterborne epoxy emulsified asphalt system.

Description

Technical Field

[0001] The invention relates to water-based epoxy emulsified asphalt and a preparation method and application thereof, belonging to the technical field of pavement materials. Background Art

[0002] SBR and SBS modified asphalt emulsions, currently widely used in microsurfacing technology, exhibit poor adhesion to RAP. Water-based epoxy asphalt emulsions offer excellent adhesion properties, improving the bond between fresh asphalt and RAP. Furthermore, because the RAP surface is coated with the old asphalt, making it hydrophobic, they bond better with RAP than with fresh aggregate. However, the curing agent in water-based epoxy asphalt emulsions is not compatible with the emulsified asphalt, causing demulsification and poor transport and storage stability. Summary of the Invention

[0003] The purpose of the present invention is to provide a water-based epoxy emulsified asphalt and its preparation method and application, wherein the curing agent is wrapped in the core by an inorganic nanomaterial shell layer, and the rigid skeleton is provided by cellulose nanocrystals to improve the mechanical strength of the shell layer, thereby preventing the shell layer from rupturing during transportation or storage, thereby preventing the water-based epoxy emulsified asphalt from self-curing; and polyethylene oxide can improve the compatibility with the emulsified asphalt through hydrogen bonds and chain entanglements, thereby preventing the emulsified asphalt from demulsifying.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: A water-based epoxy emulsified asphalt, the raw materials of which include the following components, calculated by weight: 80-130 parts of emulsified asphalt, 10-30 parts of water-based epoxy resin, 10-30 parts of curing agent, 0.2-1 part of polymerization inhibitor, and 0.6-2 parts of coupling agent; The curing agent comprises a curing agent core layer and an inorganic nano material shell layer, and polyethylene oxide is grafted on the surface of the inorganic nano material shell layer through cellulose nanocrystals.

[0005] Preferably, the curing agent core layer includes a polyamide curing agent and an aromatic amine curing agent, and the mass ratio of the polyamide curing agent to the aromatic amine curing agent is 100:(1-10).

[0006] Preferably, the molecular weight of the polyamide curing agent is 1000-3000; The aromatic amine curing agent is any one of m-phenylenediamine, m-xylylenediamine and m-aminomethylamine.

[0007] Preferably, the inorganic nanomaterial used in the inorganic nanomaterial shell layer is nano-SiO2, nano-Al2O3 or nano-MgO.

[0008] Preferably, the preparation method of the curing agent comprises the following steps: S1, dissolving the curing agent in the solvent, adding the emulsifier, and forming a core emulsion by shear emulsification; S2, dispersing the inorganic nanomaterial in an alcohol solution, adding a silane coupling agent, adjusting the pH to 4-5, and centrifuging, washing, and drying after the reaction to obtain amino nanoparticles; S3, adding the amino nanoparticles to the core emulsion, heating and stirring, evaporating the solvent, and then centrifuging, washing, and drying to obtain a core-shell curing agent; S4. Disperse cellulose nanocrystals in water, add glutaraldehyde and core-shell curing agent, react at room temperature, centrifuge, wash, and freeze-dry to obtain CNC-loaded core-shell curing agent, which is then dispersed in toluene. Add ethylene oxide monomer and catalyst, react under nitrogen atmosphere, and then centrifuge, wash, and dry.

[0009] Preferably, in step S1, the amount of the solvent is 40-60% of the mass of the curing agent, and the amount of the emulsifier is 2-4% of the mass of the curing agent; The shearing conditions are: 60-80°C, 10000-15000 rpm, 10-20 min.

[0010] Preferably, in step S2, the amount of the silane coupling agent is 5-10% of the mass of the inorganic nanomaterial; the reaction conditions are: 65-80° C., 3-5 h; In step S3, the mass ratio of the amino nanoparticles to the core emulsion is (5-8):(2-4); the heating and stirring conditions are: 50-70° C., 100-500 rpm, and 1-3 h.

[0011] Preferably, in step S4, the amount of cellulose nanocrystals is 15-30% of the mass of the core-shell curing agent, and the amount of glutaraldehyde is 10-15% of the mass of the cellulose nanocrystals; the reaction time at room temperature is 10-15 hours; and the freeze-drying conditions are: -40~-20°C, 1-3 hours; The mass ratio of ethylene oxide monomer to cellulose nanocrystals is (15-20):1; the amount of catalyst used is 0.5-1% of the mass of the ethylene oxide monomer; and the reaction conditions under a nitrogen atmosphere are: 100-130° C., 5-7 hours.

[0012] The preparation method of any of the above-mentioned water-based epoxy emulsified asphalts is to first add the polymerization inhibitor to the emulsified asphalt and stir it, then add the coupling agent and shear it until there is no flocculation in the emulsified asphalt; then add the water-based epoxy resin and curing agent and disperse them evenly.

[0013] The use of any of the above-mentioned water-based epoxy emulsified asphalt in the preparation of recycled micro-surfacing mixture is to dry-mix 80-120 parts by mass of mineral material with 1-3 parts by mass of cement, add 5-15 parts by mass of water, stir until the dry material is moistened, and then add 5-15 parts by mass of the prepared water-based epoxy emulsified asphalt and mix.

[0014] The beneficial effects of the present application are: 1. The core-shell structure of the curing agent is wrapped in the core by the inorganic nanomaterial shell layer, and at the same time, the rigid skeleton is provided by the cellulose nanocrystal to improve the mechanical strength of the shell layer and prevent the shell layer from being broken during transportation or storage, which leads to the self-curing of water-based epoxy emulsified asphalt; and the polyethylene oxide can improve the compatibility with the emulsified asphalt through hydrogen bonding and chain entanglement, prevent the demulsification of the emulsified asphalt, and improve the stability of the water-based epoxy resin system; 2. The polymerization inhibitor can prevent the polymerization reaction of the water-based epoxy emulsified asphalt during storage and transportation, thereby prolonging the storage time of the water-based epoxy emulsified asphalt. The coupling agent can further improve the compatibility of the water-based epoxy resin and the emulsified asphalt, and reduce the delamination of the water-based epoxy emulsified asphalt; 3. The water-based epoxy emulsified asphalt can improve the adhesion of new asphalt and RAP, and the adhesion effect of RAP material is better than that of new aggregate, and the wear resistance, water damage resistance, and rut deformation resistance of the prepared recycled micro-surfacing mixture are improved. DETAILED DESCRIPTION

[0015] In the following examples and comparative examples, the sources of new aggregate, RAP, and cement are respectively: Jiangsu Tongyong Road and Bridge Engineering Co., Ltd. (particle size ≤ 10 mm), Jiangxi Provincial Transportation Research Institute (particle size ≤ 10 mm), and Haishua P·O42.5 ordinary portland cement.

[0016] Example 1: The preparation method of the curing agent includes the following steps: The low molecular weight polyamide curing agent (molecular weight 1000-3000) is mixed with m-phenylenediamine at a mass ratio of 10:1, heated and stirred at 50°C for 30 min, then dimethylbenzene (amounting to 50% of the total mass of the curing agent) is added, Span-80 is used as the emulsifier (amounting to 3% of the total mass of the curing agent), and high-speed shearing emulsification (10000 rpm, 15 min) is carried out at 70°C to form a core emulsion.

[0017] The nano-SiO2 is dispersed in ethanol, γ-aminopropyltriethoxysilane (amounting to 5% of the mass of nano-SiO2) is added, the pH is adjusted to 5 (glacial acetic acid), and the reaction is carried out at 70°C for 3 h, then centrifugation, washing, and drying (60°C, 12 h) are carried out to obtain amino-functionalized nanoparticles.

[0018] The amino-functionalized nanoparticles are added to the core emulsion (the mass ratio of amino-functionalized nanoparticles to core emulsion is 7:3), and the reaction is carried out at 65°C and a rotation speed of 200 rpm for 2 h, then part of the dimethylbenzene is removed by reduced pressure distillation, and then centrifugation, washing, and drying (60°C, 12 h) are carried out to obtain the core-shell curing agent.

[0019] Cellulose nanocrystals (20% of the mass of the core-shell curing agent) were dispersed in water, and glutaraldehyde (10% of the mass of the cellulose nanocrystals) and the core-shell curing agent were added. The reaction was carried out at room temperature for 10 hours, and then the mixture was centrifuged, washed, and freeze-dried (-30°C, 2 hours) to obtain the CNC-loaded core-shell curing agent. The CNC-loaded core-shell curing agent was then dispersed in toluene, and ethylene oxide monomer (15 times the mass of the cellulose nanocrystals) and stannous octoate (1% of the mass of the ethylene oxide monomer) were added. The reaction was carried out at 120°C under a nitrogen atmosphere for 6 hours, and then the mixture was centrifuged, washed, and dried (60°C, 12 hours).

[0020] Comparative Example 1: The preparation method of the curing agent comprises the following steps: A low molecular weight polyamide curing agent (molecular weight 1000-3000) and m-phenylenediamine were mixed in a mass ratio of 10:1, heated and stirred at 50°C for 30 minutes, and then xylene (50% of the total mass of the curing agent) was added. Span-80 was used as an emulsifier (3% of the total mass of the curing agent) and high-speed shear emulsification (10,000 rpm, 15 minutes) was performed at 70°C to form a core emulsion.

[0021] Nano-SiO2 was dispersed in ethanol, γ-aminopropyltriethoxysilane (5% of the mass of nano-SiO2) was added, the pH was adjusted to 5 (glacial acetic acid), the reaction was carried out at 70°C for 3h, and then centrifuged, washed and dried (60°C, 12h) to obtain amino nanoparticles.

[0022] The aminated nanoparticles were added to the core emulsion (the mass ratio of the aminated nanoparticles to the core emulsion was 7:3), and the reaction was carried out at 65°C and 200 rpm for 2 h. After removing part of the xylene by vacuum distillation, the mixture was centrifuged, washed, and dried (60°C, 12 h) to obtain a core-shell curing agent.

[0023] Cellulose nanocrystals (20% by mass of the core-shell curing agent) were dispersed in water, and glutaraldehyde (10% by mass of the cellulose nanocrystals) and the core-shell curing agent were added. The mixture was reacted at room temperature for 10 h, and then centrifuged, washed, and freeze-dried (-30°C, 2 h) to obtain the CNC-loaded core-shell curing agent.

[0024] Comparative Example 2: The preparation method of the curing agent comprises the following steps: A low molecular weight polyamide curing agent (molecular weight 1000-3000) and m-phenylenediamine were mixed in a mass ratio of 10:1, heated and stirred at 50°C for 30 minutes, and then xylene (50% of the total mass of the curing agent) was added. Span-80 was used as an emulsifier (3% of the total mass of the curing agent) and high-speed shear emulsification (10,000 rpm, 15 minutes) was performed at 70°C to form a core emulsion.

[0025] Nano-SiO2 was dispersed in ethanol, γ-aminopropyltriethoxysilane (5% of the mass of nano-SiO2) was added, the pH was adjusted to 5 (glacial acetic acid), the reaction was carried out at 70°C for 3h, and then centrifuged, washed and dried (60°C, 12h) to obtain amino nanoparticles.

[0026] The aminated nanoparticles were added to the core emulsion (the mass ratio of the aminated nanoparticles to the core emulsion was 7:3), and the reaction was carried out at 65°C and 200 rpm for 2 h. After removing part of the xylene by vacuum distillation, the mixture was centrifuged, washed, and dried (60°C, 12 h) to obtain a core-shell curing agent.

[0027] The core-shell curing agent was dispersed in toluene, and ethylene oxide monomer (the amount was 3 times that of the core-shell curing agent) and stannous octoate (the amount was 1% of the mass of the ethylene oxide monomer) were added. The reaction was carried out at 120°C under a nitrogen atmosphere for 6 hours, and then centrifuged, washed, and dried (60°C, 12 hours).

[0028] Example 2: The method for preparing water-based epoxy emulsified asphalt is as follows: 0.6 parts by mass of a phenolic inhibitor is added to 100 parts by mass of emulsified asphalt, stirred for 15 minutes, and then 1 part by mass of a silane coupling agent is added, and sheared at 60°C and 5000 rpm until there is no flocculation in the emulsified asphalt (20 minutes); then 20 parts by mass of a water-based epoxy resin and 10 parts by mass of the curing agent prepared in Example 1 are added, and stirred at 3000 rpm for 30 minutes to obtain a water-based epoxy emulsified asphalt.

[0029] Comparative Example 3: The method for preparing water-based epoxy emulsified asphalt is as follows: add 0.6 parts by mass of a phenolic inhibitor to 100 parts by mass of emulsified asphalt, stir for 15 minutes, then add 1 part by mass of a silane coupling agent, and shear at 60°C and 5000 rpm until there is no flocculation in the emulsified asphalt (20 minutes); then add 20 parts by mass of a water-based epoxy resin and 10 parts by mass of the curing agent prepared in Comparative Example 1, stir at 3000 rpm for 30 minutes to obtain water-based epoxy emulsified asphalt.

[0030] Comparative Example 4: The method for preparing water-based epoxy emulsified asphalt is as follows: add 0.6 parts by mass of a phenolic inhibitor to 100 parts by mass of emulsified asphalt, stir for 15 minutes, then add 1 part by mass of a silane coupling agent, and shear at 60°C and 5000 rpm until there is no flocculation in the emulsified asphalt (20 minutes); then add 20 parts by mass of a water-based epoxy resin and 10 parts by mass of the curing agent prepared in Comparative Example 2, stir at 3000 rpm for 30 minutes to obtain a water-based epoxy emulsified asphalt.

[0031] Comparative Example 5: The method for preparing water-based epoxy emulsified asphalt is as follows: 0.6 parts by mass of a phenolic inhibitor is added to 100 parts by mass of emulsified asphalt, stirred for 15 minutes, and then 1 part by mass of a silane coupling agent is added, and sheared at 60°C and 5000 rpm until there is no flocculation in the emulsified asphalt (20 minutes); then 20 parts by mass of a water-based epoxy resin and 10 parts by mass of a curing agent obtained by mixing a low molecular weight polyamide curing agent (molecular weight 1000-3000) and m-phenylenediamine in a mass ratio of 10:1 are added, and stirred at 3000 rpm for 30 minutes to obtain water-based epoxy emulsified asphalt.

[0032] The stability of the water-based epoxy emulsified asphalt obtained in Example 2 and Comparative Examples 3, 4, and 5 was tested. The specific test method was to take 50 g of the prepared water-based epoxy emulsified asphalt and place it in a beaker. It was then placed in an 80°C water bath for constant temperature treatment for 10 minutes, and then transferred to an oscillator for 30 minutes at a frequency of 100 times / min. It was then allowed to stand and cooled to room temperature, and the state of the stratified interface was recorded. The results are shown in Table 1.

[0033] Table 1 Stability test results of waterborne epoxy emulsified asphalt obtained in Example 2 and Comparative Examples 3, 4, and 5

[0034] As can be seen from Table 1, the water-based epoxy emulsified asphalt prepared in Example 2 showed no stratification phenomenon after the test, indicating that its demulsification rate was low.

[0035] Example 3: The method for preparing a waterborne epoxy emulsified asphalt regeneration micro-surfacing mixture is as follows: First, a total of 100 parts by mass of mineral material (the mass ratio of new aggregate to RAP is 1:1) and 2 parts by mass of cement were dry-mixed until uniform, then 7 parts by mass of water were added and mixed at 60 rpm for 15 seconds until the dry material was completely wetted, and finally 10 parts by mass of the water-based epoxy emulsified asphalt prepared in Example 2 was added and mixed at 60 rpm for 25 seconds to obtain a regenerated micro-surfacing mixture.

[0036] Comparative Example 6: The method for preparing a water-based epoxy emulsified asphalt regeneration micro-surfacing mixture is as follows: First, a total of 100 parts by mass of mineral material (the mass ratio of new aggregate to RAP is 1:1) and 2 parts by mass of cement are dry-mixed until uniform, then 7 parts by mass of water are added and mixed at 60 rpm for 15 seconds until the dry material is completely wetted, and finally 10 parts by mass of the water-based epoxy emulsified asphalt prepared in Comparative Example 3 is added and mixed at 60 rpm for 25 seconds to obtain a regenerated micro-surfacing mixture.

[0037] Comparative Example 7: The method for preparing a water-based epoxy emulsified asphalt regeneration micro-surfacing mixture is as follows: First, a total of 100 parts by mass of mineral material (the mass ratio of new aggregate to RAP is 1:1) and 2 parts by mass of cement are dry-mixed until uniform, then 7 parts by mass of water are added and mixed at 60 rpm for 15 seconds until the dry material is completely wetted, and finally 10 parts by mass of the water-based epoxy emulsified asphalt prepared in Comparative Example 4 is added and mixed at 60 rpm for 25 seconds to obtain a regenerated micro-surfacing mixture.

[0038] Comparative Example 8: The method for preparing a water-based epoxy emulsified asphalt regeneration micro-surfacing mixture is as follows: First, a total of 100 parts by mass of mineral material (the mass ratio of new aggregate to RAP is 1:1) and 2 parts by mass of cement are dry-mixed until uniform, then 7 parts by mass of water are added and mixed at 60 rpm for 15 seconds until the dry material is completely wetted, and finally 10 parts by mass of the water-based epoxy emulsified asphalt prepared in Comparative Example 5 is added and mixed at 60 rpm for 25 seconds to obtain a regenerated micro-surfacing mixture.

[0039] Comparative Example 9: The method for preparing a water-based epoxy emulsified asphalt regeneration micro-surfacing mixture is as follows: First, a total of 100 parts by mass of mineral material (the mass ratio of new aggregate to RAP is 1:1) and 2 parts by mass of cement are dry-mixed until uniform, then 7 parts by mass of water are added and mixed at 10 rpm for 15 seconds until the dry material is completely wetted, and finally 10 parts by mass of the aqueous epoxy emulsified asphalt prepared in Example 2 are added and mixed at 10 rpm for 25 seconds to obtain a regenerated micro-surfacing mixture (the core-shell structure cannot be completely destroyed at a speed of 10 rpm, resulting in poor curing effect, which affects the performance of the regenerated micro-surfacing mixture).

[0040] Comparative Example 10: The method for preparing a new micro-surfacing mixture is as follows: First, 100 parts by mass of mineral material (new aggregate) and 2 parts by mass of cement were dry-mixed until uniform, then 7 parts by mass of water were added and mixed at 60 rpm for 15 seconds until the dry material was completely wetted, and finally 10 parts by mass of the water-based epoxy emulsified asphalt prepared in Example 2 was added and mixed at 60 rpm for 25 seconds to obtain a regenerated micro-surfacing mixture.

[0041] Comparative Example 11: The method for preparing SBR modified emulsified asphalt regeneration micro-surfacing mixture is as follows: First, 100 parts by mass of mineral material (the mass ratio of new aggregate to RAP is 1:1) and 2 parts by mass of cement were dry-mixed until uniform, then 7 parts by mass of water were added and mixed at 60 rpm for 15 seconds until the dry material was completely wetted, and finally 10 parts by mass of SBR modified emulsified asphalt was added and mixed at 60 rpm for 25 seconds to obtain the recycled micro-surfacing mixture.

[0042] Comparative Example 12: The method for preparing SBS modified emulsified asphalt regeneration micro-surfacing mixture is as follows: First, 100 parts by mass of mineral material (the mass ratio of new aggregate to RAP is 1:1) and 2 parts by mass of cement were dry-mixed until uniform, then 7 parts by mass of water were added and mixed at 60 rpm for 15 seconds until the dry material was completely wetted, and finally 10 parts by mass of SBS modified emulsified asphalt was added and mixed at 60 rpm for 25 seconds to obtain the recycled micro-surfacing mixture.

[0043] The performance of the recycled micro-surfacing mixture prepared above was tested according to the test process in the "Technical Guide for Micro-surfacing and Slurry Seal", and the results are shown in Table 2.

[0044] Table 2 Properties of the recycled microsurfacing mixtures prepared in Example 3 and Comparative Examples 6-12

[0045] As can be seen from Table 2, the micro-surfacing mixture prepared using the water-based epoxy emulsified asphalt prepared by the curing agent prepared in Example 1 has excellent wear resistance, water damage resistance (reflected by the 6d wet wheel abrasion value, the smaller the value, the better the water damage resistance), and anti-rutting deformation performance, and is better than the new material micro-surfacing mixture, SBR modified emulsified asphalt recycled micro-surfacing mixture, and SBS modified emulsified asphalt recycled micro-surfacing mixture.

[0046] The above is only a preferred embodiment of the patent of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the patent of the present invention. These improvements and modifications should also be regarded as the scope of protection of the patent of the present invention.

Claims

1. A water-based epoxy emulsified asphalt, characterized in that: The raw materials include the following components by mass: 80-130 parts of emulsified asphalt, 10-30 parts of waterborne epoxy resin, 10-30 parts of curing agent, 0.2-1 parts of polymerization inhibitor, and 0.6-2 parts of coupling agent; The curing agent comprises a curing agent core layer and an inorganic nano material shell layer, and polyethylene oxide is grafted on the surface of the inorganic nano material shell layer through cellulose nanocrystals.

2. The water-based epoxy emulsified asphalt according to claim 1, characterized in that The curing agent core layer comprises a polyamide curing agent and an aromatic amine curing agent, and the mass ratio of the polyamide curing agent to the aromatic amine curing agent is 100:(1-10).

3. The water-based epoxy emulsified asphalt according to claim 2, characterized in that The molecular weight of the polyamide curing agent is 1000-3000; The aromatic amine curing agent is any one of m-phenylenediamine, m-xylylenediamine and m-aminomethylamine.

4. The water-based epoxy emulsified asphalt according to claim 1, characterized in that The inorganic nanomaterial used in the inorganic nanomaterial shell layer is nano-SiO2, nano-Al2O3 or nano-MgO.

5. The water-based epoxy emulsified asphalt according to claim 1, characterized in that The preparation method of the curing agent comprises the following steps: S1, dissolving the curing agent in the solvent, adding the emulsifier, and forming a core emulsion by shear emulsification; S2, dispersing the inorganic nanomaterial in an alcohol solution, adding a silane coupling agent, adjusting the pH to 4-5, and centrifuging, washing, and drying after the reaction to obtain amino nanoparticles; S3, adding the amino nanoparticles to the core emulsion, heating and stirring, evaporating the solvent, and then centrifuging, washing, and drying to obtain a core-shell curing agent; S4. Disperse cellulose nanocrystals in water, add glutaraldehyde and core-shell curing agent, react at room temperature, centrifuge, wash, and freeze-dry to obtain CNC-loaded core-shell curing agent, which is then dispersed in toluene. Add ethylene oxide monomer and catalyst, react under nitrogen atmosphere, and then centrifuge, wash, and dry.

6. The water-based epoxy emulsified asphalt according to claim 5, characterized in that In step S1, the amount of solvent used is 40-60% of the mass of the curing agent, and the amount of emulsifier used is 2-4% of the mass of the curing agent; The shearing conditions are: 60-80°C, 10000-15000 rpm, 10-20 min.

7. The water-based epoxy emulsified asphalt according to claim 5, characterized in that In step S2, the amount of the silane coupling agent is 5-10% of the mass of the inorganic nanomaterial; the reaction conditions are: 65-80°C, 3-5h; In step S3, the mass ratio of the amino nanoparticles to the core emulsion is (5-8):(2-4); the heating and stirring conditions are: 50-70° C., 100-500 rpm, and 1-3 h.

8. The water-based epoxy emulsified asphalt according to claim 5, characterized in that In step S4, the amount of cellulose nanocrystals used is 15-30% of the mass of the core-shell curing agent, and the amount of glutaraldehyde used is 10-15% of the mass of the cellulose nanocrystals; the reaction time at room temperature is 10-15 hours; and the freeze-drying conditions are: -40~-20°C, 1-3 hours; The mass ratio of ethylene oxide monomer to cellulose nanocrystals is (15-20):1; the amount of catalyst used is 0.5-1% of the mass of the ethylene oxide monomer; and the reaction conditions under a nitrogen atmosphere are: 100-130° C., 5-7 hours.

9. The method for preparing the waterborne epoxy emulsified asphalt according to any one of claims 1 to 8, characterized in that: First, add the polymerization inhibitor into the emulsified asphalt and stir it, then add the coupling agent and shear it until there is no flocculation in the emulsified asphalt; then add the water-based epoxy resin and curing agent and disperse them evenly.

10. Use of the waterborne epoxy emulsified asphalt according to any one of claims 1 to 8 in preparing a regenerated microsurfacing mixture, characterized in that: The method comprises dry-mixing 80-120 parts by mass of mineral materials and 1-3 parts by mass of cement, adding 5-15 parts by mass of water, stirring until the dry materials are moistened, and then adding 5-15 parts by mass of the prepared waterborne epoxy emulsified asphalt and mixing.

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