Waterborne epoxy cold patch material for road pit slot repair and preparation method of waterborne epoxy cold patch material

Abstract

The invention relates to the technical field of road potholes, and discloses a waterborne epoxy cold patch material for repairing road potholes and a preparation method of the waterborne epoxy cold patch material. The cold patch material is prepared from the following raw materials in parts by weight: 30-45 parts of water-borne epoxy resin emulsion, 15-25 parts of a modified amine curing agent, 30-40 parts of 5-10mm graded broken stone aggregate, 10-15 parts of mineral powder and polyacrylonitrile fiber composite filler (wherein the mineral powder is 8-12 parts and the fiber doping amount is 0.1%-0.3%), 0.5-1 part of a dispersing agent, 0.2-0.5 part of a defoaming agent and 5-10 parts of water. Through synergistic curing of the water-borne epoxy resin and the hydrophilic modified amine and combination of the graded aggregate and the functional filler, construction in a solvent-free, humid environment and wide temperature range is achieved, initial curing is conducted within 2-4 hours, the final strength is achieved within 24 hours, and the water-borne epoxy resin-based waterproof coating has the advantages of being environmentally friendly, safe, convenient to construct, high in binding power, excellent in durability (the service life is longer than or equal to 2 years) and the like; the problems of high-temperature and low-temperature failure of VOCs (Volatile Organic Compounds), poor wet bonding and the like of the traditional cold patch material are solved, and the cold patch material is suitable for quickly repairing municipal and expressway pits.

Description

Technical Field

[0001] This invention relates to the field of road pothole technology, specifically to a water-based epoxy cold patching material for road pothole repair and its preparation method. Background Technology

[0002] Potholes are a common road surface defect. Traditional repair materials are mainly divided into two categories: hot-mix asphalt mixtures and cold-mix asphalt materials. Hot-mix asphalt mixtures require high-temperature (above 150℃) heating and mixing, rely on specialized equipment for construction, have high energy consumption, and cannot be used in humid or low-temperature environments (bonding fails below 5℃). They are also prone to cracking due to temperature stress after repair. Conventional cold-mix materials use petroleum asphalt as a base and add diesel / kerosene thinner. Although they can be applied at room temperature, they have the following drawbacks: Poor durability: Asphalt is easily oxidized after the thinner evaporates, resulting in low bonding strength between the repair and the original pavement (usually <0.5MPa), and loosening and detachment occur within 3-6 months; Poor environmental performance: High content of volatile organic compounds (VOCs) (>500g / L), polluting the working environment and endangering workers' health; Insufficient low-temperature performance: It is prone to embrittlement below 0℃ and has poor crack resistance; Existing improvement attempts Some studies have attempted to improve cold patch materials with emulsified asphalt or solvent-based epoxy resins, but there are still shortcomings: emulsified asphalt cold patch materials rely on water evaporation for curing, and the curing is slow (>24 hours) in humid environments, and the long-term water resistance is poor; although solvent-based epoxy cold patch materials have high bonding strength (up to 1.5 MPa or more), the residual organic solvents (such as acetone and xylene) lead to prominent VOCs problems, and the cured materials are brittle and have insufficient impact resistance.

[0003] Therefore, developing a solvent-free, low-VOCs, rapidly curing waterborne epoxy cold patching material that combines high bonding strength and flexibility has become an urgent technical problem for the industry.

[0004] Therefore, we propose a water-based epoxy cold patching material for road pothole repair and its preparation method. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a water-based epoxy cold patching material for road pothole repair, comprising the following raw materials in parts by weight: 30-45 parts water-based epoxy resin emulsion, 15-25 parts modified amine curing agent, 30-40 parts aggregate (5-10mm graded crushed stone), 10-15 parts filler (8-12 parts mineral powder + 0.1%-0.3% polyacrylonitrile fiber), 0.5-1 part dispersant, 0.2-0.5 parts defoamer, and 5-10 parts water.

[0006] Preferably, the aqueous epoxy resin emulsion is an E-51 type epoxy resin modified emulsion with a solid content of 50%-60%.

[0007] Preferably, the modified amine curing agent is a polyamide-amine copolymer or a low-temperature polyether-amine copolymer with an active hydrogen equivalent of 100-150.

[0008] Preferably, the aggregate is continuously graded crushed stone with a crushing value ≤12% and a particle size of 5-10mm.

[0009] Preferably, the mineral powder in the filler is finely ground limestone powder with a specific surface area of ​​400-600 m². 2 / kg; the length of the polyacrylonitrile fiber is 6-12mm, and the dosage is 0.1%-0.3% of the total filler.

[0010] A method for preparing a water-based epoxy cold patching material for road pothole repair, characterized by comprising the following steps: S1. Mix the aggregate, mineral powder, and polyacrylonitrile fiber for 5-8 minutes; S2. Add dispersant and defoamer and continue stirring for 3-5 minutes; S3. Mix the waterborne epoxy resin emulsion with water and add it to the mixture in step S2. Stir at low speed for 10-15 minutes. Finally, add the modified amine curing agent to S4 and stir at medium speed for 5-8 minutes until homogeneous.

[0011] Preferably, in step S3, the ratio of waterborne epoxy resin emulsion to water is 3:1-4:1, and the stirring speed after mixing is 300-500 rpm.

[0012] Preferably, in step S4, the stirring speed is 600-800 rpm and the ambient temperature is ≤40℃.

[0013] Compared with the prior art, the present invention provides a water-based epoxy cold patching material for road pothole repair and its preparation method, which has the following beneficial effects: 1. This water-based epoxy cold patching material for road pothole repair and its preparation method utilize water-based epoxy resin emulsion (using water as the dispersion medium to replace diesel / kerosene in traditional solvent-based asphalt) and hydrophilic modified amine curing agent (without added organic solvents). The volatile organic compound (VOCs) content in the material is strictly controlled at <50g / L (far lower than the national standard GB30981-2020 "Limits of Hazardous Substances in Industrial Protective Coatings" for solvent-based coatings of ≤500g / L, and even better than the implicit environmental protection indicators for cold patching materials in JT / T530-2019 "Road Rubber Asphalt Crack Filler").

[0014] 2. This invention relates to a water-based epoxy cold patching material for road pothole repair and its preparation method. Traditional solvent-based cold patching materials contain light hydrocarbons such as diesel and kerosene, which release a strong odor during construction. Long-term exposure can easily cause dizziness and respiratory irritation to construction workers. In contrast, the material of this invention uses water as the main volatile component, contains only trace amounts of water and non-toxic additives inherent in the emulsion, and has no pungent odor on site, significantly improving the occupational health environment for maintenance workers. The preparation process does not require high-temperature heating (mixing at room temperature), avoiding energy consumption and carbon emissions. When the material is stored in a sealed container, there is no risk of solvent evaporation, and the warehouse is highly safe (traditional solvent-based materials require explosion-proof storage).

[0015] 3. This water-based epoxy cold patch material for road pothole repair and its preparation method can be used directly in ambient temperatures of 0-40℃ (traditional hot-mix asphalt requires heating to ≥150℃, and solvent-based cold patch materials are prone to embrittlement and failure below 0℃). It maintains excellent workability and curing reliability, especially in low-temperature winter (0-5℃) or high-temperature summer (≤40℃) conditions. For potholes after rain or in high-humidity environments (base layer moisture content ≤5%), the water-based epoxy resin can slowly penetrate into the micropores of the base layer through capillary action of water. During curing, it can still undergo cross-linking reactions while coexisting with water (traditional emulsified asphalt relies on complete evaporation of water before bonding, resulting in slow curing and low strength at damp interfaces). Actual tests show that when repairing potholes with residual water on the base layer surface, initial bonding can be formed after 2 hours, and the strength is maintained after 24 hours. With a shear strength ≥1.0MPa (conventional cold-mix asphalt typically has a bond strength <0.5MPa on a damp base), it eliminates the need for drying the bottom or walls of potholes (traditional hot-mix asphalt requires a completely dry base) and purging (only large particles need to be removed), significantly reducing construction preparation time (average preparation time for a single pothole is reduced from 30 minutes to 5 minutes). The material curing process is divided into two stages: "initial (2-4 hours)" and "final (24 hours)"—after 2-4 hours, it can reach a compressive strength of over 2MPa, allowing light vehicles (such as non-motorized vehicles and small trucks) to pass; after 24 hours, the compressive strength is ≥8MPa, capable of withstanding heavy truck loads (axle load ≥10t), significantly reducing road closure time (traditional cold-mix asphalt requires 12-24 hours before light traffic can be opened).

[0016] 4. This water-based epoxy cold patch material for road pothole repair and its preparation method have a 24-hour compressive strength ≥8MPa (according to JT / T 530-2019 standard, ordinary cold patch materials require ≥5MPa), effectively distributing vehicle loads and preventing secondary collapse caused by localized pressure after pothole repair. In practical applications on heavy-duty lanes (such as highways and port roads), after more than 100,000 cycles of standard axle load (BZZ-100), the repaired area shows no significant crushing or deformation, and the bond strength with the original pavement (asphalt or cement concrete) is ≥1.2MPa (traditional solvent-based cold patch materials are typically 0.5-0.8MPa, and emulsified asphalt cold patch materials are ≤0.6MPa). MPa), especially in damp substrates (such as pothole walls that are not completely dry after rain), through the penetration and mechanical interlocking of water-based epoxy resin, the bond strength can still be kept stable above 1.0 MPa, effectively solving the industry problem of "delamination between the repair and the original pavement". Through aggregate gradation optimization (5-10mm continuously graded crushed stone, porosity ≤15%) and the three-dimensional network structure of epoxy resin, the material has a shear strength ≥0.8 MPa under dynamic loads (such as vehicle braking and acceleration) and a fatigue life (20℃, 10 6 The secondary cyclic load is more than twice that of conventional cold patching material, reducing progressive cracking at the edges of pits and grooves.

[0017] 5. This water-based epoxy cold patching material for road pothole repair and its preparation method show that after immersion in water for 24 hours (simulating a rainy season or waterlogged environment), the bond strength retention rate of the repaired body is ≥90% (the strength of traditional cold patching materials usually decreases by 40%-60% after immersion in water). This is mainly attributed to the hydrophobic network structure (water absorption rate <0.5%) formed after the water-based epoxy resin cures, and the mineral powder filling the voids, which reduces the water penetration channels. At a low temperature of -10℃, the material's impact resistance (drop hammer method, 1kg weight, 20cm height) is ≥15 times (conventional cold patching materials only 8-10 times). This is because of the polyacrylonitrile fibers (6-12mm in length). The "bridging" effect of the 0.2% (at a dosage of 0.2%) inhibits the brittle fracture of the epoxy resin curing network. Simultaneously, the flexible modified amine curing agent introduces long-chain flexible groups (such as polyether segments), improving the material's low-temperature toughness. Although pothole repair materials are usually located in the lower layer of the road surface (less exposed to direct UV radiation), the dispersants and defoamers added to the material are weather-resistant additives (such as a blend of hindered amine light stabilizers). After a 500-hour xenon lamp aging test (simulating 3 years of natural aging), the bond strength attenuation rate is <10% (compared to >30% for conventional cold patch materials). Long-term use makes it less prone to detachment due to aging and brittleness. The mineral powder (specific surface area 400-600m²) is also used. 2The high filling capacity ( / kg) and the volume stabilizing effect of the fiber result in a volume shrinkage rate of <0.3% during the curing process (compared to 0.5%-1.0% for traditional cold patching materials), effectively avoiding micro-cracks caused by shrinkage stress concentration (these cracks are the source of moisture intrusion and material deterioration).

[0018] 6. This water-based epoxy cold patching material for road pothole repair and its preparation method reduce traffic hazards: High bonding strength and crack resistance ensure that the repaired material does not loosen or fall off in the long term, avoiding the risks of "gravel flying" and "wheel slippage" at the edge of the pothole (especially in rainy weather), reducing the incidence of traffic accidents, and enhancing emergency rescue capabilities: In emergency repair scenarios such as sudden disasters (e.g., rainstorm erosion, earthquake damage) or peak traffic periods, the material does not need to wait for drying or heating, and can achieve "dig, patch, and pass immediately", ensuring the rapid recovery capability of the road network. The promotion and application of this invention will reduce the use of traditional solvent-based cold patching materials (estimated annual VOCs emission reduction > 100 tons / 10,000 kilometers of road). Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example An embodiment of a water-based epoxy cold patching material for road pothole repair and its preparation method. A water-based epoxy cold patching material for road pothole repair is composed of the following raw materials in parts by weight: 30-45 parts water-based epoxy resin emulsion, 15-25 parts modified amine curing agent, 30-40 parts aggregate (5-10mm graded crushed stone), 10-15 parts filler (8-12 parts mineral powder + 0.1%-0.3% polyacrylonitrile fiber), 0.5-1 part dispersant, 0.2-0.5 parts defoamer, and 5-10 parts water.

[0021] Specifically, the waterborne epoxy resin emulsion is an E-51 type epoxy resin modified emulsion with a solid content of 50%-60%.

[0022] Specifically, the modified amine curing agent is a polyamide-amine copolymer or a low-temperature polyether-amine copolymer with an active hydrogen equivalent of 100-150.

[0023] Specifically, the aggregate is continuously graded crushed stone with a crushing value of ≤12% and a particle size of 5-10mm.

[0024] Specifically, the mineral powder in the filler is finely ground limestone powder with a specific surface area of ​​400-600 m².2 / kg; the length of the polyacrylonitrile fiber is 6-12mm, and the dosage is 0.1%-0.3% of the total filler.

[0025] A method for preparing a water-based epoxy cold patching material for road pothole repair, characterized by comprising the following steps: S1. Mix the aggregate, mineral powder, and polyacrylonitrile fiber for 5-8 minutes; S2. Add dispersant and defoamer and continue stirring for 3-5 minutes; S3. Mix the waterborne epoxy resin emulsion with water and add it to the mixture in step S2. Stir at low speed for 10-15 minutes. Finally, add the modified amine curing agent to S4 and stir at medium speed for 5-8 minutes until homogeneous.

[0026] Specifically, in step S3, the ratio of waterborne epoxy resin emulsion to water is 3:1-4:1, and the stirring speed after mixing is 300-500 rpm.

[0027] Specifically, in step S4, the stirring speed is 600-800 rpm and the ambient temperature is ≤40℃.

[0028] Through the above technical solution, in this invention, by using water-based epoxy resin emulsion (using water as the dispersion medium to replace diesel / kerosene in traditional solvent-based asphalt) and hydrophilic modified amine curing agent (without added organic solvents), the volatile organic compound (VOCs) content in the material is strictly controlled to <50g / L (far lower than the national standard GB 30981-2020 "Limits of Hazardous Substances in Industrial Protective Coatings" requirement of ≤500g / L for solvent-based coatings, and even better than JT / T The implicit environmental protection indicators for cold-mix asphalt patching materials in standard 530-2019 "Road Rubber Asphalt Crack Sealing Adhesive" highlight the fact that traditional solvent-based cold-mix materials contain light hydrocarbons such as diesel and kerosene, which release strong odors during construction. Long-term exposure can easily cause dizziness and respiratory irritation for construction workers. In contrast, the material of this invention uses water as the main volatile component, containing only trace amounts of moisture and non-toxic additives inherent in the emulsion. It has no pungent odor on-site, significantly improving the occupational health environment for maintenance workers. The preparation process does not require high-temperature heating (mixing at room temperature), avoiding energy consumption and carbon emissions. When the material is stored in a sealed container, there is no risk of solvent evaporation, ensuring high warehouse safety (traditional solvent-based materials require explosion-proof storage). It can be used directly at ambient temperatures of 0-40℃ (unlike traditional hot-mix asphalt which requires...). Heating to ≥150℃ (solvent-based cold patching materials are prone to embrittlement and failure below 0℃), it maintains construction fluidity and curing reliability, especially in low-temperature winter (0-5℃) or high-temperature summer (≤40℃) scenarios. For potholes after rain or high-humidity environments (substrate moisture content ≤5%), water-based epoxy resin can slowly penetrate into the micropores of the substrate through the capillary action of water. During the curing process, it can still undergo cross-linking reaction while coexisting with water (traditional emulsified asphalt relies on complete evaporation of water before bonding, resulting in slow curing and low strength at damp interfaces). Actual tests show that when repairing potholes with residual water on the substrate surface, initial bonding can be formed after 2 hours, and the 24-hour shear strength is ≥1.0MPa (the bonding strength of conventional cold patching materials on damp substrates is usually <0).5MPa), eliminating the need for drying the bottom or walls of the pothole (traditional hot-mix asphalt requires a completely dry base layer) and purging (only large particles need to be removed), significantly shortening construction preparation time (average preparation time for a single pothole reduced from 30 minutes to 5 minutes). The material curing process is divided into two stages: "initial (2-4 hours)" and "final (24 hours)"—after 2-4 hours, a compressive strength of over 2MPa is achieved, allowing light vehicles (such as non-motorized vehicles and small trucks) to pass; after 24 hours, the compressive strength is ≥8MPa, capable of withstanding heavy truck loads (axle load ≥10t), significantly reducing road closure time (traditional cold-mix asphalt requires 12-24 hours before light traffic can be opened), and the material's 24-hour compressive strength is ≥8MPa (according to JT / T). According to the 530-2019 standard, ordinary cold patch material requires a strength of ≥5MPa. It effectively distributes vehicle loads, preventing secondary collapse caused by localized pressure after pothole repair. In practical applications on heavy-duty roads (such as highways and port roads), after more than 100,000 cycles of standard axle load (BZZ-100), the repaired area shows no significant crushing or deformation, and its bond strength with the original pavement (asphalt or cement concrete) is ≥1.2MPa (traditional solvent-based cold patch materials typically have a strength of 0.5-0.8MPa, and emulsified asphalt cold patch materials ≤0.6MPa). Especially in damp substrates (such as pothole walls that are not completely dry after rain), the bonding strength can still remain stable above 1.0 MPa through the penetration and mechanical interlocking of water-based epoxy resin, effectively solving the industry problem of "delamination between the repair body and the original road surface". Through aggregate gradation optimization (5-10mm continuous graded crushed stone, porosity ≤15%) and the three-dimensional network structure of epoxy resin, the material has a shear strength ≥0.8 MPa under dynamic loads (such as vehicle braking and acceleration) and a fatigue life (20℃, 10). 6The cyclic load capacity is more than twice that of conventional cold patching materials, reducing progressive cracking at the edges of pits. After 24 hours of immersion in water (simulating a rainy season or waterlogged environment), the bond strength retention rate of the repair is ≥90% (the strength of traditional cold patching materials usually decreases by 40%-60% after immersion in water). This is mainly attributed to the hydrophobic network structure (water absorption rate <0.5%) formed after the water-based epoxy resin cures, and the mineral powder filling the voids, which reduces the water penetration channels. In a low temperature environment of -10℃, the material's impact resistance (drop hammer method, drop weight 1kg, height 20cm) is ≥15 times (conventional cold patching materials only 8-10 times). This is because the polyacrylonitrile fibers (length 6-1) are stronger. The "bridging" effect of the 2mm (0.2% admixture) inhibits the brittle fracture of the epoxy resin curing network. Simultaneously, the flexible modified amine curing agent introduces long-chain flexible groups (such as polyether segments), improving the material's low-temperature toughness. Although pothole repair materials are usually located in the lower layer of the road surface (less exposed to direct UV radiation), the dispersants and defoamers added to the material are weather-resistant additives (such as a blend of hindered amine light stabilizers). After a 500-hour xenon lamp aging test (simulating 3 years of natural aging), the bond strength attenuation rate is <10% (compared to >30% for conventional cold patch materials). Long-term use makes it less prone to detachment due to aging and brittleness. The mineral powder (specific surface area 400-600m²) is also used. 2 The high filling capacity ( / kg) and the volume stability of the fibers result in a volume shrinkage rate of <0.3% during the curing process (compared to 0.5%-1.0% for traditional cold patch materials). This effectively avoids micro-cracks caused by shrinkage stress concentration (these cracks are the source of moisture intrusion and material deterioration), reducing traffic hazards. High bonding strength and crack resistance ensure that the repair remains intact and does not fall off over a long period, avoiding the risks of "gravel flying" and "wheel slippage" at the edges of potholes (especially in rainy weather), thus reducing the incidence of traffic accidents and enhancing emergency response capabilities. In emergency repair scenarios during sudden disasters (such as rainstorms or earthquake damage) or peak traffic periods, the material does not need to wait for drying or heating, achieving "dig, patch, and clear immediately," ensuring the rapid recovery capability of the road network. The promotion and application of this invention will reduce the use of traditional solvent-based cold patch materials (estimated annual VOCs emission reduction >100 tons / 10,000 kilometers of road).

[0029] Prepare water-based epoxy cold patching material according to the following parts by weight: Waterborne epoxy resin emulsion (E-51 modified, solid content 55%): 40 parts Modified amine curing agent (polyamide-amine copolymer, active hydrogen equivalent 120): 20 parts Aggregate (5-10mm continuously graded crushed stone, crushing value 10%): 35 parts Filler: Mineral powder (finely ground limestone, specific surface area 500 m²) 2 8 parts ( / kg) + 2 parts (8mm length, 0.2%) of polyacrylonitrile fiber. Dispersant (ammonium polycarboxylate): 0.8 parts Defoamer (organic silicone-polyether composite): 0.3 parts Water: 8 parts Preparation process: Add the aggregate, mineral powder, and polyacrylonitrile fiber to the mixer and stir at 1000 rpm for 6 minutes; Add dispersant and defoamer, and stir at 800 rpm for 4 minutes; Mix the waterborne epoxy emulsion with water (emulsion:water = 3:1) and stir at 300 rpm for 12 minutes; Finally, add the modified amine curing agent, stir at 700 rpm for 6 minutes, and then discharge and seal the package.

[0030] Performance testing (based on JT / T 530-2019 "Rope Asphalt Crack Sealant for Road Surface" and self-developed bond strength test method): Bond strength (damp substrate): 1.35 MPa (0.82 MPa for conventional cold patch material); Compressive strength (24h): 8.5MPa (≥6MPa is required for heavy-duty vehicle passage); VOCs content: 42g / L; 0℃ impact resistance (drop hammer method): 15 times (8 times for conventional cold patching material); Two-year field test (pothole repair on a highway): no loosening or falling off, and good flatness maintained.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A water-based epoxy cold patching material for road pothole repair, characterized in that: It is composed of the following raw materials in parts by weight: 30-45 parts of water-based epoxy resin emulsion, 15-25 parts of modified amine curing agent, 30-40 parts of aggregate (5-10mm graded crushed stone), 10-15 parts of filler (8-12 parts of mineral powder + 0.1%-0.3% of polyacrylonitrile fiber), 0.5-1 part of dispersant, 0.2-0.5 parts of defoamer, and 5-10 parts of water.

2. The water-based epoxy cold patching material for road pothole repair according to claim 1, characterized in that: The aqueous epoxy resin emulsion is an E-51 type epoxy resin modified emulsion with a solid content of 50%-60%.

3. The water-based epoxy cold patching material for road pothole repair according to claim 1, characterized in that: The modified amine curing agent is a polyamide-amine copolymer or a low-temperature polyether-amine copolymer with an active hydrogen equivalent of 100-150.

4. The water-based epoxy cold patching material for road pothole repair according to claim 1, characterized in that: The aggregate is continuously graded crushed stone with a crushing value of ≤12% and a particle size of 5-10mm.

5. A water-based epoxy cold patching material for road pothole repair according to claim 1, characterized in that: The mineral powder in the filler is finely ground limestone powder with a specific surface area of ​​400-600 m². 2 / kg; the length of the polyacrylonitrile fiber is 6-12mm, and the dosage is 0.1%-0.3% of the total filler.

6. A method for preparing a water-based epoxy cold patching material for road pothole repair, characterized in that: Includes the following steps: S1. Mix the aggregate, mineral powder, and polyacrylonitrile fiber for 5-8 minutes; S2. Add dispersant and defoamer and continue stirring for 3-5 minutes; S3. Mix the waterborne epoxy resin emulsion with water and add it to the mixture in step S2. Stir at low speed for 10-15 minutes. Finally, add the modified amine curing agent to S4 and stir at medium speed for 5-8 minutes until homogeneous.

7. A method for preparing a water-based epoxy cold patching material for road pothole repair according to claim 6, characterized in that: In step S3, the ratio of waterborne epoxy resin emulsion to water is 3:1-4:1, and the stirring speed after mixing is 300-500 rpm.

8. A method for preparing a water-based epoxy cold patching material for road pothole repair according to claim 6, characterized in that: In step S4, the stirring speed is 600-800 rpm and the ambient temperature is ≤40℃.