Modified super-viscous emulsified asphalt as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of road engineering materials, and particularly relates to modified super-viscous emulsified asphalt as well as a preparation method and application thereof. The modified super-viscous emulsified asphalt is prepared from the following raw materials in parts by mass: 55-65 parts of matrix asphalt, 3-8 parts of an asphalt modifier, 10-15 parts of filler, 3-5 parts of a tackifier, 2-5 parts of an emulsifier, 3-5 parts of a stabilizer, 3-5 parts of a cross-linking agent, 30-40 parts of water, 1-3 parts of a plasticizer and 5-8 parts of auxiliaries, and the auxiliaries comprise an anti-stripping agent, an antioxidant, a plasticizer and an acidity regulator. The modified super-viscous emulsified asphalt provided by the invention has excellent film-forming property, adhesivity and waterproofness, and not only improves the interlayer bonding capacity, but also enhances the use durability. The modified super-viscous emulsified asphalt disclosed by the invention has excellent cohesiveness, waterproofness and durability, is suitable for being used as a road engineering material, and can meet application scenes with different requirements.

Description

Technical Field

[0001] The present invention belongs to the technical field of road engineering materials, and in particular relates to a modified super-viscous emulsified asphalt, and a preparation method and application thereof. Background Art

[0002] With the continuous advancement of road and bridge construction and construction engineering, asphalt has played an important role in road and bridge construction and waterproofing operations due to its excellent waterproof and bonding properties. When paving asphalt pavement, a key construction step is to lay a layer of emulsified asphalt between adjacent structural layers as a bonding medium to promote the overall force between structural layers and effectively resist inter-layer displacement caused by vehicle loads, especially heavy vehicles, thereby significantly reducing the risk of pavement diseases and extending the service life of the road.

[0003] The production process of emulsified asphalt involves dispersing molten asphalt into water with the aid of emulsifiers and other additives through high-intensity shearing mechanical equipment to form an oil-in-water emulsion. However, this type of emulsified asphalt has limitations such as insufficient mechanical properties and sensitivity to temperature changes, and is only suitable for base layer treatment.

[0004] In recent years, researchers have tried to improve the overall performance of water-based asphalt coatings by adding rubber ingredients such as SBS to molten asphalt. This measure significantly enhanced the performance and elongation at break of the material in high and low temperature environments. Despite this, rubber-modified water-based asphalt coatings still face challenges in actual construction, mainly reflected in the insufficient bonding strength between the coating and the base layer. As the frequency of loads increases, internal defects in the material gradually emerge, and microcracks continue to expand, causing the strength of the pavement structure to gradually decrease until fatigue damage occurs and cracks eventually appear on the pavement.

[0005] Therefore, it is necessary to develop an emulsified asphalt, and a preparation method and application thereof to improve the overall performance of road engineering materials and meet application scenarios with different needs. Summary of the invention

[0006] The purpose of the present invention is to overcome the disadvantages of the above-mentioned emulsified asphalt and provide a modified super-viscous emulsified asphalt.

[0007] The present invention adopts the following technical solutions: A modified super-viscous emulsified asphalt is made from the following raw materials in parts by weight: 55-65 parts of base asphalt, 3-8 parts of asphalt modifier, 10-15 parts of filler, 3-5 parts of tackifier, 2-5 parts of emulsifier, 3-5 parts of stabilizer, 3-5 parts of cross-linking agent, 30-40 parts of water, 1-3 parts of plasticizer, and 5-8 parts of additives, wherein the additives include anti-stripping agent, antioxidant, plasticizer, and pH regulator.

[0008] Specifically, the base asphalt is the main component of the emulsified asphalt, providing the basic bonding and waterproofing properties for the entire system. Further, the asphalt modifier can significantly improve the high and low temperature performance and elongation at break of the asphalt. Further, the filler can increase the solid content of the emulsified asphalt and improve the thickness and durability of the coating. Further, the tackifier can enhance the bonding force between the emulsified asphalt and the base surface and improve the adhesion of the coating. Further, the emulsifier can ensure that the asphalt particles are stably dispersed in the water to form a uniform emulsion, which has the effect of reducing the interfacial tension between the asphalt and the water. Further, the stabilizer helps to maintain the stability of the emulsified asphalt, helps to ensure the long-term stability of the emulsion, and prevents the emulsion from stratification or water loss. Further, the cross-linking agent can promote the cross-linking reaction between the asphalt molecules, helps to improve the overall performance of the emulsified asphalt, and improves the strength and durability of the coating. Further, water provides the necessary medium for the formation of the emulsion, which can ensure that the emulsion has good fluidity and construction performance.

[0009] Additionally, plasticizers can increase the flexibility and ductility of the coating, reduce its brittleness, and help improve the overall performance of the coating. Furthermore, anti-stripping agents can increase the adhesion between the coating and the substrate to prevent the occurrence of peeling. Furthermore, antioxidants can delay the aging process of the coating and improve its durability. Furthermore, pH regulators can adjust the pH value of the emulsion to ensure its stability.

[0010] The base asphalt is one of No. 70 or No. 90 road petroleum asphalt, and the asphalt modifier includes at least two of styrene-butadiene-styrene block copolymer, styrene-butadiene rubber, and ethylene-vinyl acetate copolymer.

[0011] Specifically, No. 70 or No. 90 road petroleum asphalt has good fluidity, thermal stability, long-lasting adhesion, elastic-plasticity, electrical insulation and water resistance. Specifically, No. 70 road petroleum asphalt has low wax content, good crack resistance, good brittleness resistance, good high temperature stability, strong strain capacity and strong rutting resistance. No. 90 road petroleum asphalt has the characteristics of high ductility, good plasticity and durability, large ratio of evaporation to needle penetration, good product homogeneity and heat aging resistance. In areas with higher temperatures, No. 70 asphalt has better resistance to high temperature deformation and reduces the occurrence of rutting; in areas with lower temperatures, No. 90 asphalt is beneficial to prevent the road surface from cracking at low temperatures.

[0012] Specifically, styrene-butadiene-styrene block copolymers have excellent tensile strength, elasticity and electrical properties, and in asphalt modification, can significantly improve the low-temperature flexibility and high-temperature stability of asphalt.

[0013] Specifically, styrene-butadiene rubber has the advantages of wear resistance, cold resistance, low heat generation, low shrinkage, etc. In asphalt modification, it can enhance the adhesion and durability of asphalt, and improve the crack resistance and rutting resistance of the road surface.

[0014] Specifically, ethylene-vinyl acetate copolymer has good softness, elasticity, and excellent anti-aging and ozone resistance. In asphalt modification, it can improve the flexibility and weather resistance of asphalt, and increase the durability and service life of the road surface.

[0015] Furthermore, the combination of styrene-butadiene-styrene block copolymer and styrene-butadiene rubber can make the emulsified asphalt less likely to flow and deform at high temperatures, maintain good flexibility at low temperatures, and reduce the occurrence of cracks.

[0016] Furthermore, the combination of styrene-butadiene-styrene block and ethylene-vinyl acetate copolymer can make the emulsified asphalt resist erosion by aging factors such as ultraviolet rays and oxidation during long-term use, while maintaining a good load-bearing capacity under vehicle load.

[0017] Furthermore, the combination of styrene-butadiene rubber and ethylene-vinyl acetate copolymer makes the emulsified asphalt perform well in bonding aggregates, while also maintaining good performance under complex environmental conditions. For example, in a humid environment, the good bonding properties can reduce the spalling of aggregates, and its aging resistance can ensure the stability of the road surface under long-term sun and rain.

[0018] Specifically, by combining base asphalt with at least two asphalt modifiers, a modified super-viscous emulsified asphalt with excellent performance can be prepared. The modified super-viscous emulsified asphalt not only has excellent adhesion, water resistance and durability, but also can maintain stable performance under different temperature conditions. At the same time, due to the use of multiple modifiers for composite modification, the comprehensive performance of asphalt can be further improved to meet the needs of various complex application scenarios.

[0019] The filler comprises at least three of modified silicon dioxide, nano calcium carbonate, polypropylene composite particles, modified montmorillonite and modified carbon nanotubes.

[0020] Specifically, the modified silica of the present invention is γ-(2,3-epoxypropoxy)propyltrimethoxysilane-modified silica. The modified silica has higher dispersibility and reactivity, and can enhance the mechanical strength and wear resistance of the coating. In emulsified asphalt, the modified silica has a high specific surface area, which can enhance the interfacial bonding force with asphalt, improve the strength and stability of the emulsified asphalt, and reduce the deformation of the road surface during use. Furthermore, the modified silica can be used as a reinforcing agent to increase the hardness and durability of the coating. Improve the high temperature performance of the emulsified asphalt, so that it is not easy to soften and flow at high temperatures.

[0021] The preparation steps of γ-(2,3-epoxypropoxy)propyltrimethoxysilane modified silica are as follows: N1. Dry the nano-silica at 100°C for 2-4 hours to remove the moisture adsorbed on the surface, and cool to room temperature; N2. Prepare a γ-(2,3-epoxypropoxy)propyltrimethoxysilane-ethanol solution with a γ-(2,3-epoxypropoxy)propyltrimethoxysilane concentration of 1%. Use hydrochloric acid to adjust the pH value of the solution to 3-4 to promote the hydrolysis reaction of silane. Add the dried silica to the silane solution to allow the silane to fully contact and coat the surface of the silica. Heat the mixture to 50-60°C and stir with a magnetic stirrer or mechanical stirrer for 2-4 hours to promote the hydrolysis and condensation reaction of silane. N3. Filter the modified silica and wash it with anhydrous ethanol and deionized water several times to remove unreacted silane and other impurities. Dry the washed silica at 60-80°C for 4-6 hours until it is completely dry.

[0022] Specifically, nano calcium carbonate has an excellent reinforcing effect and can significantly improve the strength and toughness of coatings. The nanoscale size of nano calcium carbonate enables it to be evenly dispersed in asphalt to form a dense filling network, which can fill the tiny pores in asphalt, improve the density and waterproof performance of emulsified asphalt, enhance the hardness and wear resistance of emulsified asphalt, and reduce the wear of the road surface.

[0023] Specifically, the polypropylene composite particles are made of glass fiber and polypropylene composite materials, which have excellent heat resistance and weather resistance, and can increase the thermal stability and service life of emulsified asphalt. In emulsified asphalt, the polypropylene composite particles can be used as an anti-aging agent to prevent asphalt from aging due to long-term exposure to sunlight.

[0024] Specifically, the modified montmorillonite is montmorillonite modified with hexadecyltrimethylammonium bromide, which has good water absorption and swelling properties, and can increase the adhesion and impermeability of asphalt. In emulsified asphalt, it can be used as a waterproofing agent to improve the waterproof performance of the coating and improve the rheological properties of emulsified asphalt, making it easier to apply and shape during construction.

[0025] The preparation method of modified montmorillonite is: M1: Sodium montmorillonite is dissolved in deionized water, and an exfoliated montmorillonite suspension is obtained under stirring, and the mass concentration of montmorillonite in the suspension is 0.1-2%; M2: Add hexadecyltrimethylammonium bromide to deionized water, stir evenly to prepare a hexadecyltrimethylammonium bromide solution, and adjust the pH value to 6-8; M3: Slowly add hexadecyltrimethylammonium bromide to the exfoliated montmorillonite suspension. The reaction temperature is controlled at 50-100°C and the reaction time is 90-210 minutes; M4: The reaction product is centrifuged and washed 2-5 times to remove unreacted hexadecyltrimethylammonium bromide and other impurities, and dried at 70-80°C for 12-18 hours to remove moisture and residual solvent.

[0026] Specifically, the modified carbon nanotubes are polyaniline-modified carbon nanotubes, which have excellent mechanical properties and can significantly improve the strength and toughness of emulsified asphalt. They have good electrical conductivity and can promote the self-healing properties of emulsified asphalt. When microcracks appear on the road surface, they can accelerate the flow and healing process of asphalt. At the same time, the modified carbon nanotubes can improve the thermal conductivity of emulsified asphalt, which is beneficial for the heat dissipation of the road surface at high temperatures and reduce the generation of rutting.

[0027] The method for preparing polyaniline-modified carbon nanotubes comprises the following steps: P1. Add aniline monomer into deionized water, stir evenly, prepare an aniline solution of a certain concentration, and adjust the pH value of the aniline solution to 2-3 with hydrochloric acid to promote the protonation of aniline; P2. Disperse 100 mg of multi-walled carbon nanotubes in an appropriate amount of deionized water, use an ultrasonic disperser to disperse for 30 minutes to ensure that the carbon nanotubes are evenly dispersed, and wash the dispersed carbon nanotubes with deionized water several times to remove impurities; P3. Add the dispersed carbon nanotubes to the aniline solution to ensure that the carbon nanotubes are completely immersed in the solution; use a magnetic stirrer or a mechanical stirrer to stir for 30-60 minutes at room temperature to obtain a mixed solution, so that the aniline can fully contact and adsorb on the surface of the carbon nanotubes; dissolve an appropriate amount of ammonium persulfate in a small amount of deionized water, and then slowly add it to the above mixed solution; cool the mixed solution to 0-5°C in an ice bath, and continue stirring for 4-8 hours to promote the in-situ polymerization of polyaniline on the surface of the carbon nanotubes.

[0028] P4. Filter the modified carbon nanotubes and wash them with deionized water and anhydrous ethanol for multiple times to remove unreacted aniline, ammonium sulfate and other impurities. Dry the washed carbon nanotubes at 60-80° C. for 4-6 hours until they are completely dry.

[0029] The above-mentioned at least three fillers are used in combination to prepare a modified super-viscous emulsified asphalt with excellent performance. These fillers can form a multi-level filling network in the asphalt to enhance the mechanical properties and durability of the coating. At the same time, due to the synergistic effect between different fillers, the present invention can further improve the comprehensive performance of the coating, such as improving the hardness, wear resistance, heat resistance, weather resistance and bonding strength of the coating film.

[0030] The tackifier includes epoxy tackifier resin and thermoplastic elastomer. The tackifier can improve the adhesion and elastic recovery of asphalt, and can significantly improve the anti-rutting performance, durability and noise reduction effect of asphalt mixture.

[0031] Specifically, the tackifier used is the high-viscosity modifier PT-HVA for drainage asphalt pavement of Guolu New Materials, which includes epoxy-based tackifying resin and thermoplastic elastomer, which can effectively improve the absolute viscosity of asphalt, and has the characteristics of high softening point, high elastic recovery, high viscosity toughness, high anti-aging and the like. Furthermore, the epoxy-based tackifying resin has high adhesion and reactivity. Among the tackifiers, the epoxy-based tackifying resin can improve the bonding strength between the emulsified asphalt and the stone and the different structural layers, effectively prevent interlayer slippage, and ensure the integrity and stability of the pavement structure. In addition, the epoxy-based tackifying resin also has excellent heat resistance, chemical resistance and mechanical properties, making the emulsified asphalt difficult to soften and flow under high temperature conditions. Furthermore, thermoplastic elastomers give emulsified asphalt good elastic recovery properties, allowing the road surface to quickly return to its original state after being subjected to vehicle loads, reducing the accumulation of permanent deformation, and improving the impact resistance of the road surface. In low temperature environments, thermoplastic elastomers can maintain the flexibility of emulsified asphalt and prevent road cracking. Thermoplastic elastomers can improve the rheological properties of emulsified asphalt, making it easier to apply and compact during construction, thereby improving construction efficiency and quality.

[0032] The emulsifier is a fatty amine cationic emulsifier.

[0033] The fatty amine cationic emulsifier is prepared by reacting palmitic acid with 1,3-propylenediamine, comprising the following steps: Q1: Dissolve palmitic acid in xylene solvent to form a solution, add p-toluenesulfonic acid as a catalyst to the solution to promote the esterification reaction, heat the mixture to a reflux temperature of 110-120°C, and continue stirring to allow the palmitic acid to completely dissolve and undergo esterification. After the reaction is completed, cool to room temperature, filter to remove unreacted solid impurities, and obtain a fatty acid ester solution; Q2: Heat the fatty acid ester solution to 80-100°C, slowly drop 1,3-propylenediamine into the fatty acid ester solution while continuing to stir, heat the mixture to 120-150°C, and continue to stir to carry out the amidation reaction; Q3: After the reaction is completed, cool to room temperature and wash with deionized water several times to remove unreacted 1,3-propylenediamine and other impurities.

[0034] Specifically, the fatty amine cationic emulsifier of the present invention has a lipophilic group and a hydrophilic group. The lipophilic group can combine with asphalt, and the hydrophilic group can interact with water. Through the action of mechanical forces such as high-speed shearing, the asphalt is evenly dispersed in the water in the form of tiny particles, and a stable emulsion system is formed. Furthermore, the cationic emulsifier will be adsorbed on the surface of the asphalt particles in the emulsion, so that the asphalt particles have a positive charge. Since the same charges repel each other, this electrostatic repulsion can prevent the asphalt particles from aggregating with each other, thereby improving the stability of the emulsion and extending the storage time of the emulsified asphalt.

[0035] In addition, in asphalt pavement construction, the use of fatty amine cationic emulsifiers can significantly reduce the viscosity of asphalt, making it easier to spread, compact and solidify, thereby improving construction efficiency. Fatty amine cationic emulsifiers can enhance the adhesion between asphalt and substrates such as stone, and improve the durability and resistance to water damage of the pavement. Compared with other types of emulsifiers, fatty amine cationic emulsifiers have lower environmental pollution and meet environmental protection requirements.

[0036] The stabilizer includes one or both of polyvinyl alcohol solution and polyacrylamide solution.

[0037] Specifically, the stabilizer includes a polyvinyl alcohol solution with a mass fraction of 0.5-2% and a polyacrylamide solution with a mass fraction of 0.1-1%.

[0038] Specifically, polyvinyl alcohol molecules can adsorb on the surface of polymer particles and form a protective film, which helps prevent agglomeration and precipitation between particles. By reducing the interfacial tension in the system, polyvinyl alcohol helps to enhance the stability of the emulsion. The addition of polyvinyl alcohol solution can increase the viscosity of the entire system, thereby further stabilizing the emulsion. Polyvinyl alcohol contains a large number of hydroxyl groups on the molecular chain, which can form hydrogen bonds with asphalt molecules and stone surfaces. When emulsified asphalt is used in road construction, this hydrogen bonding helps to enhance the bonding force between the emulsified asphalt and the stone, making the road surface structure more solid and reducing the possibility of interlayer peeling.

[0039] Specifically, polyacrylamide has good flocculation properties and can connect asphalt particles together to form a three-dimensional network structure through the extension and entanglement of molecular chains. This structure can enhance the shear resistance of emulsified asphalt, so that it can maintain the integrity of the emulsion when subjected to external forces. At the same time, this three-dimensional network structure also helps to improve the stability of the emulsion and reduce the sedimentation of asphalt particles.

[0040] The crosslinking agent includes terephthalate and dimethoxymethane.

[0041] Specifically, terephthalate glycol can undergo cross-linking reaction with active groups (such as hydroxyl, carboxyl, etc.) in emulsified asphalt. This cross-linking reaction will form a three-dimensional network structure inside the emulsified asphalt, which can improve the cohesion and bonding strength of the emulsified asphalt. Terephthalate glycol also has a certain antibacterial effect and can inhibit the reproduction and growth of microorganisms such as bacteria and fungi, which helps to extend the storage effect and service life of emulsified asphalt and reduce maintenance costs. After adding terephthalate glycol to emulsified asphalt, its crack resistance, rutting resistance and durability can be significantly improved. In a high temperature environment, due to its three-dimensional network structure, the movement of the molecular chain of the cross-linked emulsified asphalt is restricted, and it is not easy to soften and flow, which can maintain the flatness of the road surface and improve the high temperature resistance of the road surface.

[0042] Specifically, the methoxy group in the chemical structure of dimethoxymethane can react with the hydroxyl or acid group in the polymer chain to form a cross-linked structure. This cross-linked structure can significantly improve the thermal stability and chemical resistance of the material, allowing the emulsified asphalt to maintain stable performance under high temperature or harsh environment. Dimethoxymethane can react with the components in the emulsified asphalt to promote the curing process of the emulsified asphalt. After road construction, when the water evaporates, it can speed up the drying speed of the emulsified asphalt, allowing the road surface to reach the strength requirements for opening to traffic more quickly.

[0043] As the water evaporates continuously, the asphalt particles in the emulsified asphalt begin to aggregate and form a continuous asphalt film. P-phenylene glycol and dimethoxymethane can play a synergistic role in the modified super-viscous emulsified asphalt. The three-dimensional network structure constructed by p-phenylene glycol provides a basic strength and stability framework for the emulsified asphalt, which can increase the softening point of the asphalt, thereby improving the stability of the asphalt under high temperature conditions, while dimethoxymethane can increase the disorder of the carbon layer and the surface defects, play a role in promoting curing and chemical resistance. The combination of the two can significantly improve the strength, stability, aging resistance, water resistance and chemical corrosion resistance of the emulsified asphalt.

[0044] The anti-stripping agent is at least one of calcium stearate and zinc acetate, the antioxidant is β-(4-hydroxyphenyl-3,5-di-tert-butyl) propionate, the plasticizer is alkyl sulfonate phenyl ester, and the pH adjuster includes hydrochloric acid and sodium hydroxide.

[0045] Specifically, calcium stearate can form a chemical bond with the surface of stone in asphalt, enhance the adhesion between asphalt and stone, effectively prevent asphalt from peeling off the stone surface, improve the durability of the road surface, and enhance the splitting tensile strength and water damage resistance of the asphalt mixture.

[0046] Specifically, zinc acetate can improve the hydrophilicity of the stone surface, enhance the adhesion between emulsified asphalt and acidic stone, help enhance the adhesion and durability of the material, prevent coating peeling, and increase the service life of the material.

[0047] Specifically, β-(4-hydroxyphenyl-3,5-di-tert-butyl) propionate can inhibit the oxidation reaction of asphalt, delay the aging process of emulsified asphalt during use, maintain the adhesion and waterproofness of emulsified asphalt, and thus extend the service life of the road surface.

[0048] Specifically, alkyl phenyl sulfonate can reduce the glass transition temperature of emulsified asphalt, improve its flexibility and low-temperature performance, make emulsified asphalt easier to apply and shape during construction, improve construction efficiency, reduce cracks in the road surface caused by low temperatures, improve the frost resistance of the road surface, and enhance the plasticity of emulsified asphalt, so that it can better adapt to the deformation of the road surface and reduce the stress concentration of the road surface under vehicle load. It has high saponification resistance, can protect the coating even after a long period of cleaning, and has very good compatibility with polymers.

[0049] Specifically, hydrochloric acid, as an acidic regulator, can lower the pH value of water to prevent the emulsification effect and stability from being affected by excessive alkalinity. Sodium hydroxide, as an alkaline regulator, can increase the pH value of water, which helps to adjust the hardness of water and the optimal pH value for emulsified asphalt.

[0050] Furthermore, another object of the present invention is to provide a method for preparing a modified super-viscous emulsified asphalt, comprising the following steps: S1. Stir corresponding amounts of stabilizer, part of water and part of emulsifier at 50-60°C with a high-speed stirrer at 400-600rpm for 1-5min to obtain a first mixed solution, adjust the pH value to 2-3 with a pH adjuster, add an anti-stripping agent and an antioxidant to the first mixed solution, and stir with a high-speed stirrer at 400-600 rpm for 5-10 minutes to obtain a basic soap solution; high-speed stirring helps to evenly disperse ingredients such as stabilizers and emulsifiers to form a stable solution, adjust the pH value to 2-3 with a pH adjuster, optimize the effect of the emulsifier and improve the stability of the emulsification process, add anti-stripping agents and antioxidants to improve the adhesion and aging resistance of the emulsified asphalt, and the obtained basic soap solution has stable chemical properties and good dispersibility, providing a good foundation for the subsequent emulsification process.

[0051] S2. Heat the base asphalt to 130-180°C, add a corresponding amount of asphalt modifier by mass, and stir at 800-1200 rpm for 30-60 minutes using a high-speed mixer to obtain a modified base asphalt; high temperature and high-speed stirring help the asphalt modifier to completely dissolve and evenly disperse, thereby improving the modification effect.

[0052] S3. Slowly add the modified matrix asphalt into the base soap solution, and use a high-speed shear emulsifier to emulsify it at the same time. The shear speed is 3000-5000 rpm and the emulsification time is 10-30 minutes to obtain an emulsified asphalt intermediate. The high-speed shear emulsifier can provide a strong shear force to fully mix the modified matrix asphalt with the base soap solution, ensuring that the modified matrix asphalt is evenly dispersed under the action of the emulsifier to form fine particles, thereby improving the stability of the emulsified asphalt and forming a stable emulsion.

[0053] S4. Stir the corresponding mass parts of tackifier, plasticizer, remaining water and remaining emulsifier at 50-60°C with a high-speed stirrer at 800-1200 rpm for 20-50 minutes to obtain a second mixed solution; high-speed stirring ensures that the tackifier, plasticizer and emulsifier are fully mixed to form a uniform liquid. The obtained second mixed solution can further improve the adhesion and plasticity of the emulsified asphalt.

[0054] S5. Add the filler of corresponding mass parts to the emulsified asphalt intermediate, stir for 30-60 minutes at 800-1200 rpm by high-speed mixer, add the second mixed solution and continue stirring for 10-30 minutes at 800-1200 rpm, adjust the pH value to 2-5 by pH regulator, add cross-linking agent, continue stirring for 10-30 minutes at 800-1200 rpm, and obtain modified super-viscous emulsified asphalt. High-speed stirring can ensure that the filler is evenly dispersed in the emulsified asphalt intermediate and improve the mechanical properties of the emulsified asphalt. Tackifiers and plasticizers can improve the adhesion and flexibility of emulsified asphalt, improve construction performance, and ensure that all ingredients are fully mixed and reach a uniform state. Adjusting the pH value helps to stabilize the emulsified system, and adding a cross-linking agent can promote the cross-linking reaction between asphalt molecules and improve the strength and durability of emulsified asphalt.

[0055] The strength and toughness of emulsified asphalt can be improved by adding modifiers and fillers. The long-term stability and uniformity of emulsified asphalt can be ensured by pH adjustment and high-speed shear emulsification. The adhesion and flexibility of emulsified asphalt can be improved by adding tackifiers and plasticizers, making it easier to construct. The durability and fatigue resistance of emulsified asphalt can be improved by adding cross-linking agents.

[0056] Furthermore, another object of the present invention is to provide an application of a modified super-viscous emulsified asphalt, wherein the modified super-viscous emulsified asphalt is used in the preventive maintenance construction of a super-viscous anti-slip seal layer.

[0057] Specifically, modified super-viscous emulsified asphalt has excellent film-forming, adhesion, and waterproof properties, which not only improves the interlayer bonding ability, but also enhances the durability of use. Therefore, the application of modified super-viscous emulsified asphalt in the preventive maintenance construction of super-viscous anti-skid seal can effectively improve the anti-skid performance and durability of the road surface, thereby extending the service life of the road and improving driving safety.

[0058] Compared with the prior art, the present invention has the following advantages: 1. The modified super-viscous emulsified asphalt of the present invention has excellent film-forming properties, adhesion, and waterproof properties, which not only improves the interlayer bonding ability, but also enhances the durability of use. The formula design of the modified super-viscous emulsified asphalt of the present invention is reasonable, and each raw material can give full play to its respective role, thereby improving the comprehensive performance of the emulsified asphalt. The modified super-viscous emulsified asphalt of the present invention has excellent adhesion, waterproofness and durability, is suitable for use as a road engineering material, and can meet application scenarios with different needs.

[0059] 2. The preparation method of the present invention can improve the mechanical strength of the modified super-viscous emulsified asphalt, and ensure the long-term stability and uniformity of the emulsified asphalt through pH adjustment and high-speed shear emulsification. The present invention utilizes the addition of tackifiers and plasticizers to improve the adhesion and flexibility of the emulsified asphalt, making it easier to construct.

[0060] 3. The application of the modified super-viscous emulsified asphalt of the present invention in the preventive maintenance construction of super-viscous anti-skid seal layer can effectively improve the anti-skid performance and durability of the road surface, thereby extending the service life of the road and improving driving safety. DETAILED DESCRIPTION

[0061] In order to make those skilled in the art more clearly understand the technical solution of the present invention, the following examples are listed for illustration. Unless otherwise specified, the raw materials, reagents or devices used in the following embodiments can be obtained from conventional commercial channels or can be obtained by existing known methods.

[0062] The present invention will be further described below in conjunction with specific embodiments: The modified silica is silica modified with γ-(2,3-epoxypropoxy)propyltrimethoxysilane.

[0063] The preparation steps of γ-(2,3-epoxypropoxy)propyltrimethoxysilane modified silica are as follows: N1, nano-silica was dried at 100°C for 2 hours to remove the moisture adsorbed on the surface and then cooled to room temperature; N2. Prepare γ-(2,3-epoxypropoxy)propyltrimethoxysilane-ethanol solution with a concentration of 1%. Adjust the pH value of the solution to 3 with hydrochloric acid. Add the dried silica to the silane solution. Heat the mixture to 50°C and continue stirring for 3 hours.

[0064] N3. Filter the modified silica, wash it with anhydrous ethanol and deionized water for several times, and dry the washed silica at 80° C. for 4 hours until it is completely dry to obtain γ-(2,3-epoxypropoxy)propyltrimethoxysilane-modified silica.

[0065] The polypropylene composite particles adopt VLF 80107 CC of RTP of the United States.

[0066] The modified montmorillonite is montmorillonite modified by hexadecyltrimethylammonium bromide, and the preparation method of the modified montmorillonite is as follows: M1: 2 g of sodium montmorillonite was dissolved in deionized water, and a montmorillonite suspension with a mass concentration of 2% was obtained under stirring. The cation exchange capacity of the sodium montmorillonite was 100 meq / 100 g; M2: Add hexadecyltrimethylammonium bromide to deionized water, stir evenly, prepare hexadecyltrimethylammonium bromide solution, adjust pH value to 6-8, the amount of hexadecyltrimethylammonium bromide is 2 mol / meq montmorillonite exchange capacity; M3: Slowly add hexadecyltrimethylammonium bromide to the exfoliated montmorillonite suspension. The reaction temperature is controlled at 100°C and the reaction time is 210 minutes; M4: The reaction product is centrifuged and washed 2-5 times to remove unreacted hexadecyltrimethylammonium bromide and other impurities, and dried at 70-80°C for 12-18 hours to remove moisture and residual solvent.

[0067] The modified carbon nanotubes are polyaniline-modified carbon nanotubes.

[0068] The method for preparing polyaniline-modified carbon nanotubes comprises the following steps: P1. Add 0.5 g of aniline monomer into 100 ml of deionized water, stir evenly to prepare an aniline solution, and adjust the pH value of the aniline solution to 2-3 with hydrochloric acid to promote the protonation of aniline; P2, dispersing 100 mg of multi-walled carbon nanotubes in 100 ml of deionized water, using an ultrasonic disperser for 30 minutes, and washing the dispersed carbon nanotubes with deionized water several times; P3. Add the dispersed carbon nanotubes to the aniline solution, stir for 60 minutes at room temperature using a magnetic stirrer or a mechanical stirrer to obtain a mixed solution, dissolve 0.5 g of ammonium persulfate in a small amount of deionized water, and then slowly add the mixed solution to the mixed solution; cool the mixed solution to 5° C. in an ice bath, and continue stirring for 8 hours; P4. Filter the modified carbon nanotubes, wash them with deionized water and anhydrous ethanol for multiple times, and dry the washed carbon nanotubes at 80° C. for 4 hours until they are completely dry.

[0069] The emulsifier is a fatty amine cationic emulsifier.

[0070] The fatty amine cationic emulsifier is prepared by reacting palmitic acid with 1,3-propylenediamine, comprising the following steps: Q1: Dissolve 50g of palmitic acid in 100mL of xylene solvent to form a solution, add 0.5g of p-toluenesulfonic acid as a catalyst to the solution, heat the mixture to a reflux temperature of 120°C, and continue stirring. After the reaction is completed, cool to room temperature, filter to remove unreacted solid impurities, and obtain a fatty acid ester solution; Q2: Heat the above fatty acid ester solution to 100°C, slowly drop 15g of 1,3-propylenediamine into the fatty acid ester solution while continuing to stir, heat the mixture to 120°C, and continue stirring; Q3: After the reaction is completed, cool to room temperature and wash with deionized water for several times to remove unreacted propylene diamine and other impurities to obtain a fatty amine cationic emulsifier.

[0071] The viscosity enhancer used is Guolu New Materials' high viscosity modifier for drainage asphalt pavement PT-HVA.

[0072] The stabilizer includes one or both of a 1% by mass polyvinyl alcohol solution and a 0.5% by mass polyacrylamide solution.

[0073] A method for preparing modified super-viscous emulsified asphalt comprises the following steps: S1, stirring corresponding parts by mass of a stabilizer, part of water, and part of an emulsifier at 50-60° C. at 400-600 rpm using a high-speed stirrer for 1-5 min to obtain a first mixed solution, adjusting the pH value to 2-3 using a pH adjuster, and then adding an anti-stripping agent and an antioxidant to the first mixed solution, and then stirring at 400-600 rpm using a high-speed stirrer for 5-10 minutes to obtain a basic soap solution; S2, heating the base asphalt to 130-180° C., adding a corresponding amount of asphalt modifier by mass, and stirring at 800-1200 rpm for 30-60 minutes using a high-speed mixer to obtain a modified base asphalt; S3, slowly adding the modified matrix asphalt into the base soap solution, and simultaneously using a high-speed shear emulsifier for emulsification, with a shear speed of 3000-5000 rpm and an emulsification time of 10-30 minutes to obtain an emulsified asphalt intermediate; S4, stirring the corresponding mass parts of tackifier, plasticizer, remaining water, and remaining emulsifier at 50-60° C. using a high-speed stirrer at 800-1200 rpm for 20-50 minutes to obtain a second mixed solution; S5. Add the filler of corresponding mass parts to the emulsified asphalt intermediate, stir it at 800-1200 rpm for 30-60 minutes using a high-speed stirrer, add the second mixed liquid and continue stirring at 800-1200 rpm for 10-30 minutes, adjust the pH value to 2-5 using a pH adjuster, then add the cross-linking agent, and continue stirring at 800-1200 rpm for 10-30 minutes to obtain a modified super-viscous emulsified asphalt.

[0074] Table 1: Weight distribution ratio of the formula

[0075] Example 1 A method for preparing modified super-viscous emulsified asphalt comprises the following steps: S1, stirring corresponding parts by mass of a stabilizer, 20 parts of water, and 2 parts of an emulsifier at 50-60° C. at 600 rpm for 1 min using a high-speed stirrer to obtain a first mixed solution, adjusting the pH value to 2 using a pH adjuster, and then adding an anti-stripping agent and an antioxidant to the first mixed solution, and then stirring at 400 rpm for 5 minutes using a high-speed stirrer to obtain a basic soap solution; S2, heating the base asphalt to 130° C., adding a corresponding amount of asphalt modifier by mass, and stirring the mixture at 800 rpm for 30 minutes using a high-speed mixer to obtain a modified base asphalt; S3, slowly adding the modified matrix asphalt into the base soap solution, and simultaneously emulsifying it using a high-speed shear emulsifier at a shear speed of 3000 rpm and an emulsification time of 10 minutes to obtain an emulsified asphalt intermediate; S4, stirring the corresponding mass parts of tackifier, plasticizer, remaining water, and remaining emulsifier at 50° C. and 800 rpm in a high-speed stirrer for 20 minutes to obtain a second mixed solution; S5. Add the filler in corresponding parts by mass to the emulsified asphalt intermediate, stir the mixture at 800 rpm for 30 minutes using a high-speed stirrer, add the second mixed solution and continue stirring at 800 rpm for 10 minutes, adjust the pH value to 2 using a pH adjuster, then add the cross-linking agent, and continue stirring at 800 rpm for 10 minutes to obtain a modified super-viscous emulsified asphalt.

[0076] Example 2 A method for preparing modified super-viscous emulsified asphalt comprises the following steps: S1, stirring corresponding parts by mass of a stabilizer, 30 parts of water, and 2 parts of an emulsifier at 60° C. with a high-speed stirrer at 600 rpm for 5 min to obtain a first mixed solution, adjusting the pH value to 3 with a pH adjuster, adding an anti-stripping agent and an antioxidant to the first mixed solution, and stirring at 600 rpm with a high-speed stirrer for 10 minutes to obtain a basic soap solution; S2, heating the base asphalt to 150° C., adding a corresponding amount of asphalt modifier by mass, and stirring the mixture at 1200 rpm for 60 minutes using a high-speed mixer to obtain a modified base asphalt; S3, slowly adding the modified matrix asphalt into the base soap solution, and simultaneously emulsifying it using a high-speed shear emulsifier at a shear speed of 5000 rpm and an emulsification time of 30 minutes to obtain an emulsified asphalt intermediate; S4, stirring the corresponding mass parts of tackifier, plasticizer, remaining water, and remaining emulsifier at 60° C. and 1200 rpm in a high-speed stirrer for 50 minutes to obtain a second mixed solution; S5. Add the filler in corresponding parts by mass to the emulsified asphalt intermediate, stir the mixture at 1200 rpm for 60 minutes using a high-speed stirrer, add the second mixed solution and continue stirring at 1200 rpm for 30 minutes, adjust the pH value to 2 using a pH adjuster, then add the cross-linking agent, and continue stirring at 1200 rpm for 30 minutes to obtain a modified super-viscous emulsified asphalt.

[0077] Example 3 A method for preparing modified super-viscous emulsified asphalt comprises the following steps: S1, stirring corresponding parts by mass of stabilizer, 20 parts of water, and 2 parts of emulsifier at 50-60°C with a high-speed stirrer at 500 rpm for 3 min to obtain a first mixed solution, adjusting the pH value to 2 with a pH adjuster, adding an anti-stripping agent and an antioxidant to the first mixed solution, and stirring at 500 rpm with a high-speed stirrer for 7 minutes to obtain a basic soap solution; S2, heating the base asphalt to 180° C., adding a corresponding amount of asphalt modifier by mass, and stirring the mixture at 1000 rpm for 40 minutes using a high-speed mixer to obtain a modified base asphalt; S3, slowly adding the modified matrix asphalt into the base soap solution, and simultaneously emulsifying it using a high-speed shear emulsifier at a shear speed of 4000 rpm and an emulsification time of 40 minutes to obtain an emulsified asphalt intermediate; S4, stirring corresponding parts by mass of tackifier, plasticizer, remaining water, and remaining emulsifier at 55° C. and 1000 rpm in a high-speed stirrer for 40 minutes to obtain a second mixed solution; S5. Add the filler in corresponding parts by mass to the emulsified asphalt intermediate, stir the mixture at 1000 rpm for 40 minutes using a high-speed stirrer, add the second mixed solution and continue stirring at 1000 rpm for 40 minutes, adjust the pH value to 3 using a pH adjuster, then add the cross-linking agent, and continue stirring at 1000 rpm for 40 minutes to obtain a modified super-viscous emulsified asphalt.

[0078] Example 4 A method for preparing modified super-viscous emulsified asphalt comprises the following steps: S1, stirring corresponding parts by mass of a stabilizer, 25 parts of water, and 1.5 parts of an emulsifier at 50° C. at 400 rpm for 1 min using a high-speed stirrer to obtain a first mixed solution, adjusting the pH value to 2 using a pH adjuster, adding an anti-stripping agent and an antioxidant to the first mixed solution, and stirring at 500 rpm for 5 minutes using a high-speed stirrer to obtain a basic soap solution; S2, heating the base asphalt to 160° C., adding a corresponding amount of asphalt modifier by mass, and stirring the mixture at 900 rpm for 50 minutes using a high-speed mixer to obtain a modified base asphalt; S3, slowly adding the modified matrix asphalt into the base soap solution, and simultaneously emulsifying it using a high-speed shear emulsifier at a shear speed of 3000 rpm and an emulsification time of 50 minutes to obtain an emulsified asphalt intermediate; S4, stirring the corresponding mass parts of tackifier, plasticizer, remaining water, and remaining emulsifier at 50° C. and 900 rpm in a high-speed stirrer for 30 minutes to obtain a second mixed solution; S5. Add the filler of corresponding mass parts to the emulsified asphalt intermediate, stir it at 900 rpm for 50 minutes using a high-speed stirrer, add the second mixed liquid and continue stirring at 900 rpm for 20 minutes, adjust the pH value to 5 using a pH adjuster, then add the cross-linking agent, and continue stirring at 900 rpm for 20 minutes to obtain a modified super-viscous emulsified asphalt.

[0079] Example 5 A method for preparing modified super-viscous emulsified asphalt comprises the following steps: S1, stirring corresponding parts by mass of a stabilizer, 20 parts of water, and 3 parts of an emulsifier at 60° C. with a high-speed stirrer at 600 rpm for 5 min to obtain a first mixed solution, adjusting the pH value to 3 with a pH adjuster, adding an anti-stripping agent and an antioxidant to the first mixed solution, and stirring at 400 rpm with a high-speed stirrer for 10 minutes to obtain a basic soap solution; S2, heating the base asphalt to 130° C., adding a corresponding amount of asphalt modifier by mass, and stirring the mixture at 1100 rpm for 30 minutes using a high-speed mixer to obtain a modified base asphalt; S3, slowly adding the modified matrix asphalt into the base soap solution, and simultaneously emulsifying it using a high-speed shear emulsifier at a shear speed of 5000 rpm and an emulsification time of 10 minutes to obtain an emulsified asphalt intermediate; S4, stirring corresponding parts by mass of tackifier, plasticizer, remaining water, and remaining emulsifier at 60° C. and 1100 rpm in a high-speed stirrer for 20 minutes to obtain a second mixed solution; S5. Add the filler in corresponding parts by mass to the emulsified asphalt intermediate, stir the mixture at 1100 rpm for 30 minutes using a high-speed stirrer, add the second mixed solution and continue stirring at 1100 rpm for 20 minutes, adjust the pH value to 4 using a pH adjuster, then add the cross-linking agent, and continue stirring at 1100 rpm for 20 minutes to obtain a modified super-viscous emulsified asphalt.

[0080] Comparative Example 1 The main difference between Comparative Example 1 and Example 2 is that the asphalt modifier is completely replaced with styrene-butadiene-styrene block copolymer in Comparative Example 1. The remaining steps and component parameters of Comparative Example 1 are the same as those of Example 2.

[0081] Comparative Example 2 The main difference between Comparative Example 2 and Example 2 is that all fillers are replaced with commercially available silicon dioxide in Comparative Example 2. The remaining steps and component parameters of Comparative Example 2 are the same as those of Example 2.

[0082] Comparative Example 3 The main difference between Comparative Example 3 and Example 2 is that the tackifier and the crosslinking agent are omitted in Comparative Example 3. The remaining steps and component parameters of Comparative Example 3 are the same as those of Example 2.

[0083] Comparative Example 4 The main difference between Comparative Example 4 and Example 2 is that the emulsifier in Comparative Example 4 is replaced by commercially available octylphenol polyoxyethylene ether Triton x-100. The remaining steps and component parameters of Comparative Example 4 are the same as those of Example 2.

[0084] Comparative Example 5 The main difference between Comparative Example 5 and Example 2 is that the preparation method in Comparative Example 5 is modified as follows: A method for preparing modified super-viscous emulsified asphalt comprises the following steps: S1. Stir corresponding amounts of stabilizer, water and emulsifier at 60° C. and 600 rpm in a high-speed stirrer for 5 min to obtain a first mixed solution, adjust the pH value to 3 using a pH adjuster, add an anti-stripping agent, an antioxidant, a tackifier, a plasticizer, a filler and a cross-linking agent to the first mixed solution, and stir the mixture at 600 rpm in a high-speed stirrer for 10 minutes to obtain a basic soap solution; S2, heating the base asphalt to 150° C., adding a corresponding amount of asphalt modifier by mass, and stirring for 60 minutes at a speed of 1200 rpm using a high-speed mixer to obtain a modified super-viscous emulsified asphalt; S3. Slowly add the modified matrix asphalt into the base soap solution and use a high-speed shear emulsifier to emulsify it at the same time. The shear speed is 5000 rpm and the emulsification time is 30 minutes to obtain modified super-viscous emulsified asphalt.

[0085] The component parameters of Comparative Example 5 are the same as those of Example 2.

[0086] The above embodiments and comparative examples were subjected to performance tests, wherein the test method for residual solid content was T0651, the test method for demulsification rate was T0658-1993, the test method for storage stability was T0655, the test method for ductility (10°, 5cm / min) was T0605, the test method for softening point (TR&B) was T0604, the test method for 60°C dynamic viscosity was T0620, the prepared emulsified asphalt was used to make test pieces according to the Marshall method, the test methods for viscosity (25°C) and toughness (25°C) were T0624, the test method for elastic recovery (25°) was T0662, the water permeability coefficient of the test piece with a molding thickness of 3 cm was tested, the time taken for the water level to drop from 1000 ml to 500 ml was tested by a water permeability coefficient measuring instrument, and the water permeability coefficient mL / min was obtained, and the wear rate was tested by a wet wheel abrasion test, and the test method was JTG E20-2011, T 0752-2011, the BPN value is determined by a pendulum friction coefficient tester.

[0087] The test data are shown in Table 2 and Table 3: Table 2: Performance test results of Examples 1-5

[0088] Table 3: Performance test results of comparative examples 1-5

[0089] Specifically, the water permeability coefficients of Examples 1-5 are 635, 627, 632, 674, and 653 mL / min, respectively, the BPN values ​​of Examples 1-5 are 80.6, 81.2, 80.5, 81.1, and 80.2, respectively, and the wear rates of Examples 1-5 are 0.4, 0.4, 0.4, 0.4, and 0.4, respectively. As can be seen from Table 2, in Examples 1-5, through the coordination between the raw materials, each of the functions can be fully exerted to improve the comprehensive performance of the emulsified asphalt. Emulsified asphalt has excellent adhesion, waterproofness, and durability, and is suitable for various road and bridge engineering and waterproof engineering. The preparation method of Example 1-5 can improve the mechanical strength of the modified super-viscous emulsified asphalt, and ensure the long-term stability and uniformity of the emulsified asphalt through pH adjustment and high-speed shear emulsification. By adding tackifiers and plasticizers, the adhesion and flexibility of the emulsified asphalt are improved, making it easier to construct. The modified super-viscous emulsified asphalt of Examples 1 to 5 has excellent film-forming properties, adhesion, and waterproof properties, which not only improves the interlayer bonding ability, but also enhances the durability of use. The application of modified super-viscous emulsified asphalt in the preventive maintenance construction of super-viscous anti-skid seal can effectively improve the anti-skid performance and durability of the road surface, thereby extending the service life of the road and improving driving safety.

[0090] As can be seen from Table 3, compared with Example 2, Comparative Example 1 adopts styrene-butadiene-styrene block copolymer instead of all asphalt modifiers. The water permeability coefficient of Comparative Example 1 is 723mL / min, the BPN value of Comparative Example 1 is 77.6, and the wear rate of Comparative Example 1 is 0.5. In Example 2, the combination of styrene-butadiene-styrene block copolymer and styrene-butadiene rubber can make emulsified asphalt difficult to flow and deform at high temperature, maintain good flexibility at low temperature, and reduce the generation of cracks. The combination of styrene-butadiene-styrene block and ethylene-vinyl acetate copolymer can make emulsified asphalt resist the erosion of aging factors such as ultraviolet rays and oxidation during long-term use, and maintain good bearing capacity under vehicle load. The combination of styrene-butadiene rubber and ethylene-vinyl acetate copolymer makes emulsified asphalt perform well in bonding aggregates, and can also maintain good performance under complex environmental conditions. For example, in a humid environment, due to good bonding, the peeling of aggregates can be reduced, and under long-term sun and rain, its aging resistance can ensure the stability of the road surface. Example 2 is superior in ductility, softening point, viscosity, toughness, elastic recovery, wear resistance and skid resistance. Therefore, the mechanical properties, aging resistance and temperature resistance of Comparative Example 1 are worse than those of Example 2.

[0091] Comparative Example 2 Compared with Example 2, Comparative Example 2 uses commercially available silicon dioxide. The water permeability coefficient of Comparative Example 2 is 1023mL / min, the BPN value of Comparative Example 2 is 78.9, and the wear rate of Comparative Example 2 is 0.6. The filler of Example 2 can prepare a modified super-viscous emulsified asphalt with excellent performance, and these fillers can form a multi-level filling network in asphalt to enhance the mechanical properties and durability of the coating. At the same time, due to the synergistic effect between different fillers, the comprehensive properties of the coating can be further improved, such as improving the hardness, wear resistance, heat resistance, weather resistance and bonding strength of the coating. Therefore, the mechanical properties, aging resistance, water resistance, temperature resistance, wear resistance and skid resistance of Comparative Example 2 are worse than those of Example 2.

[0092] Compared with Example 2, Comparative Example 3 omits the thickener and the cross-linking agent. The water permeability coefficient of Comparative Example 3 is 1123 mL / min, the BPN value of Comparative Example 3 is 76.6, and the wear rate of Comparative Example 3 is 0.4. The thickener of Example 2 is the high-viscosity modifier PT-HVA for drainage asphalt pavement produced by Guolu New Materials, which includes an epoxy thickening resin and a thermoplastic elastomer, can increase the absolute viscosity of asphalt, and has the characteristics of high softening point, high elastic recovery, high viscosity toughness, and high anti-aging.

[0093] As the water evaporates continuously, the asphalt particles in the emulsified asphalt begin to aggregate to form a continuous asphalt film. The terephthalate glycol and dimethoxymethane in Example 2 can play a synergistic role in the modified super-viscous emulsified asphalt. The three-dimensional network structure constructed by terephthalate glycol provides a basic strength and stability framework for the emulsified asphalt, while dimethoxymethane plays a role in curing promotion and chemical resistance. The combination of the two can significantly improve the strength, stability, aging resistance, water resistance and chemical corrosion resistance of the emulsified asphalt. Therefore, the 60°C dynamic viscosity of Comparative Example 3 is lower than that of Example 2, and the storage stability, water resistance, mechanical properties, aging resistance, temperature resistance and skid resistance of Comparative Example 3 are worse than those of Example 2.

[0094] Comparative Example 4 Compared with Example 2, the emulsifier used in Comparative Example 4 is commercially available octylphenol polyoxyethylene ether Triton x-100, the water permeability coefficient of Comparative Example 4 is 683mL / min, the wear rate of Comparative Example 3 is 0.4, and the BPN value of Comparative Example 4 is 77.6. The fatty amine cationic emulsifier in Example 2 has a lipophilic group and a hydrophilic group. The lipophilic group can combine with asphalt, and the hydrophilic group can interact with water. Through the action of mechanical forces such as high-speed shear, the asphalt is evenly dispersed in the water in the form of tiny particles, and a stable emulsion system is formed. The cationic emulsifier will be adsorbed on the surface of the asphalt particles in the emulsion, so that the asphalt particles have a positive charge. Since the same charges repel each other, this electrostatic repulsion can prevent the asphalt particles from aggregating with each other, thereby improving the stability of the emulsion and extending the storage time of the emulsified asphalt.

[0095] In asphalt pavement construction, emulsifiers can significantly reduce the viscosity of asphalt, making it easier to spread and compact, thereby improving construction efficiency. Fatty amine cationic emulsifiers can enhance the adhesion of asphalt to substrates such as stone, and improve the durability and water damage resistance of the pavement. Triton x-100 is a non-ionic surfactant. The foam of Triton x-100 is relatively more than that of cationic emulsifiers. The demulsification speed of asphalt emulsified by Triton X-100 is relatively slow. Under normal environmental conditions, it can keep the emulsified asphalt in an emulsion state for a long time, which provides more time for construction operations. Therefore, the demulsification speed, storage stability, mechanical properties, aging resistance, and temperature resistance of Comparative Example 4 are all worse than those of Example 2. Due to its long demulsification time, the implementation of the spreading process of Comparative Example 4 will also affect the overall construction progress.

[0096] Compared with Example 2, in Comparative Example 5, multiple materials are mixed simultaneously, the water permeability coefficient of Comparative Example 5 is 943 mL / min, the BPN value of Comparative Example 5 is 75.3, the wear rate of Comparative Example 3 is 0.4, and the filler in Comparative Example 5 is easier to agglomerate during mixing than that in Example 2, and the thickener in Comparative Example 5 is not heated during mixing, resulting in incomplete mixing and dispersion of the thickener, and the overall viscosity cannot be completely improved, resulting in the storage stability, mechanical properties, aging resistance, water resistance, and temperature resistance of Comparative Example 5 being worse than those of Example 2.

[0097] The above is a preferred embodiment of the present invention. Relevant personnel in this technical field may make several improvements and modifications without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A modified super-viscous emulsified asphalt, characterized in that: The invention is made of the following raw materials in parts by weight: 65-75 parts of base asphalt, 3-8 parts of asphalt modifier, 10-15 parts of filler, 3-5 parts of tackifier, 2-5 parts of emulsifier, 3-5 parts of stabilizer, 3-5 parts of cross-linking agent, 30-40 parts of water and 5-8 parts of auxiliary agents, wherein the auxiliary agents include anti-stripping agent, antioxidant, plasticizer and pH regulator.

2. A modified super-viscous emulsified asphalt according to claim 1, characterized in that: The base asphalt is one of No. 70 or No. 90 road petroleum asphalt, and the asphalt modifier includes at least two of styrene-butadiene-styrene block copolymer, styrene-butadiene rubber, and ethylene-vinyl acetate copolymer.

3. A modified super-viscous emulsified asphalt according to claim 1, characterized in that: The filler comprises at least three of modified silicon dioxide, nano calcium carbonate, polypropylene composite particles, modified montmorillonite and modified carbon nanotubes.

4. A modified super-viscous emulsified asphalt according to claim 1, characterized in that: The tackifier includes an epoxy-based tackifying resin and a thermoplastic elastomer.

5. A modified super-viscous emulsified asphalt according to claim 1, characterized in that: The emulsifier is a fatty amine cationic emulsifier.

6. A modified super-viscous emulsified asphalt according to claim 2, characterized in that: The stabilizer includes one or both of polyvinyl alcohol solution and polyacrylamide solution.

7. A modified super-viscous emulsified asphalt according to claim 3, characterized in that: The crosslinking agent includes terephthalate and dimethoxymethane.

8. The modified super-viscous emulsified asphalt according to claim 1, characterized in that: The anti-stripping agent is at least one of calcium stearate and zinc acetate, the antioxidant is β-(4-hydroxyphenyl-3,5-di-tert-butyl) propionate, the plasticizer is alkyl sulfonate phenyl ester, and the pH adjuster includes hydrochloric acid and sodium hydroxide.

9. A method for preparing a modified super-viscous emulsified asphalt according to any one of claims 1 to 8, characterized in that: The steps include: S1. Stir corresponding amounts of stabilizer, part of water and part of emulsifier at 50-60° C. with a high-speed stirrer at 400-600 rpm for 1-5 min to obtain a first mixed solution, adjust the pH value to 2-3 with an acidity regulator, add an anti-stripping agent and an antioxidant to the first mixed solution, and stir with a high-speed stirrer at 400-600 rpm for 5-10 minutes to obtain a basic soap solution; S2, heating the base asphalt to 130-180° C., adding a corresponding amount of asphalt modifier by mass, and stirring at 800-1200 rpm for 30-60 minutes using a high-speed mixer to obtain a modified base asphalt; S3, slowly adding the modified matrix asphalt into the base soap solution, and simultaneously emulsifying it using a high-speed shear emulsifier, with a shear speed of 3000-5000 rpm and an emulsification time of 10-30 minutes, to obtain an emulsified asphalt intermediate; S4, stirring corresponding weight portions of tackifier, plasticizer, remaining water, and remaining emulsifier at 50-60° C. with a high-speed stirrer at 800-1200 rpm for 20-50 minutes to obtain a second mixed solution; S5. Add the filler in corresponding parts by mass to the emulsified asphalt intermediate, stir it at a speed of 800-1200 rpm for 30-60 minutes using a high-speed stirrer, add the second mixed solution, continue stirring at a speed of 800-1200 rpm for 10-30 minutes, adjust the pH value to 2-5 using an acidity regulator, then add the cross-linking agent, and continue stirring at a speed of 800-1200 rpm for 10-30 minutes to obtain a modified super-viscous emulsified asphalt.

10. The use of a modified super-viscous emulsified asphalt according to any one of claims 1 to 8, characterized in that: The modified super-viscous emulsified asphalt is used in the preventive maintenance construction of super-viscous anti-skid sealing layers.

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