Polyurethane-epoxy modified asphalt pavement normal-temperature repairing material and preparation method thereof

Abstract

The invention relates to the technical field of road paving materials, in particular to a polyurethane-epoxy modified asphalt pavement normal-temperature repairing material and a preparation method thereof. The specific preparation method comprises the following steps: stirring and mixing the epoxy resin, the epoxy resin diluent and the polyurethane prepolymer at 40-60 DEG C to obtain a component A; heating asphalt to a molten state, uniformly mixing the asphalt with an asphalt diluent, cooling to 40 DEG C or below, adding a curing agent and a compatibilizer, and stirring and mixing to obtain a component B; and uniformly mixing and stirring the component A and the component B to obtain the polyurethane-epoxy modified asphalt pavement normal-temperature repairing material. A flexible chain segment is introduced into a cross-linking system by utilizing the polyurethane prepolymer, so that the toughness of the material is improved, the mechanical property of the material is enhanced, the service life of the material is prolonged, cold repair of asphalt pavement diseases is met, and the service life of the pavement is prolonged; the problems that an existing cold mixing type epoxy asphalt material can be laid only after being heated during construction and the overall performance of the material is relatively poor are solved.

Description

Technical Field

[0001] The invention relates to the technical field of road paving materials, and in particular to a polyurethane-epoxy modified asphalt pavement normal temperature repair material and a preparation method thereof. Background Art

[0002] Municipal road maintenance places higher demands on pothole repair, especially in terms of appearance, quality and completion time. Maintenance units are faced with an urgent need to complete tasks quickly and efficiently. However, there are many problems with traditional hot-mix asphalt repair methods, such as high cost, difficulty in compaction under low temperature conditions, and uneconomical small-scale repairs. In addition, the traditional hot-mix asphalt repair method will form hot and cold joints around the repaired potholes. Due to the expansion and contraction of asphalt, cracks may split, resulting in poor overall connectivity between the newly repaired pavement and the original pavement. At the same time, hot-mix asphalt requires more preliminary preparation work, long construction time, and slow traffic opening, which is not conducive to the rapid restoration of road traffic. Therefore, it is necessary to explore new repair technologies or methods to meet the high efficiency and high quality requirements of municipal road maintenance.

[0003] In comparison, asphalt cold patch material is simpler and faster, and can be repaired immediately, so that oil road diseases can be curbed in the early stage and prevent the disease from further expanding. It is suitable for all-season and all-weather road maintenance. In addition, asphalt cold patch material overcomes the limitations of traditional methods and can be stored for a long time. Even small potholes can be repaired at any time, and the performance of the repaired road surface is consistent with that of hot-mix asphalt mixture. Therefore, asphalt cold patch material has replaced traditional hot-mix asphalt mixture and become the first choice for road pavement pothole repair. It not only meets high-standard repair requirements, but also shows significant superiority in improving maintenance efficiency and reducing costs. Cold-mix epoxy asphalt materials, due to their excellent strength and high-temperature performance, provide a new option for cold repair of road diseases. However, due to certain limitations of epoxy resin itself, cold-mix epoxy asphalt has the problem of insufficient toughness after curing.

[0004] In order to solve the problem of insufficient toughness after cold-mix epoxy asphalt curing, prior art 1: CN105016655B discloses a polyurethane-modified epoxy asphalt mixture that can be cured twice. Although the mixture has improved strength and toughness, it fails to meet the requirements of cold-mix construction at room temperature. It still needs to be heated during construction before laying, and the construction time is long. Prior art 2: CN102321372B discloses a water-based polyurethane epoxy resin modified emulsified asphalt, which can achieve room-temperature construction of materials and significantly improve the convenience of construction. However, due to the inherent characteristics and limitations of the two basic materials, emulsified asphalt and water-based polyurethane, the overall performance of the composite material, such as strength and toughness, still has room for improvement and fails to fully meet the high standards for material performance in the field of municipal road maintenance. Summary of the invention

[0005] In order to solve the problem that the existing cold-mix epoxy asphalt material still needs to be heated before paving during construction and the material has insufficient mechanical properties, the purpose of the present invention is to provide a polyurethane-epoxy modified asphalt pavement room temperature repair material that can be laid at room temperature and a preparation method thereof.

[0006] The present invention utilizes polyurethane to introduce flexible segments into the cross-linking system to improve the toughness of the material, enhance the mechanical properties and service life of the material, meet the requirements of cold repair of asphalt pavement diseases and extend the service life of the pavement.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows.

[0008] The first aspect of the present invention provides a method for preparing a polyurethane-epoxy modified asphalt pavement room temperature repair material, comprising the following steps:

[0009] The epoxy resin, epoxy resin diluent and polyurethane prepolymer are stirred and mixed at 40-60° C. to obtain component A.

[0010] After the asphalt is heated to a molten state, it is mixed with an asphalt diluent, and after the temperature is lowered to below 40° C., a curing agent and a compatibilizer are added, and the mixture is stirred and mixed to obtain component B.

[0011] The component A and the component B are stirred and mixed to obtain a polyurethane-epoxy modified asphalt pavement room temperature repair material.

[0012] The epoxy resin diluent is 1,6-hexanediol diglycidyl ether, polypropylene glycol diglycidyl ether, C 12 -C 14 At least one of alkyl glycidyl ether, benzyl glycidyl ether and decyl glycidyl ether; the asphalt diluent is at least one of fatty acid methyl ester, trichloroethylene, unsaturated fatty acid, acetone, toluene, dibutyl phthalate and dioctyl phthalate; the curing agent is at least one of fatty amine curing agent, phenolic amine curing agent and polyamide curing agent.

[0013] The polyurethane-epoxy modified asphalt pavement room temperature repair material of the present invention is mainly prepared by mixing component A and component B, wherein component A includes epoxy resin, epoxy resin diluent and polyurethane prepolymer; component B includes asphalt, asphalt diluent, curing agent and compatibilizer.

[0014] The present invention modifies asphalt by using polyurethane prepolymer and epoxy resin. The epoxy resin contains active functional groups that can undergo curing and cross-linking, and can undergo gelation reaction to form a stable and uniform cross-linked phase with asphalt in thermodynamics. The polyurethane prepolymer introduces flexible segments into the cross-linking system to improve the toughness of the system. Through the polyurethane-epoxy resin composite modification, the mechanical properties of the material are greatly enhanced.

[0015] In the present invention, the introduction of asphalt diluent and epoxy resin diluent can significantly reduce the viscosity of the system, so that the material still maintains good fluidity and processability at room temperature, which is convenient for on-site construction and paving. The use of amine curing agents allows the epoxy resin to complete the curing reaction at room temperature; through the mutual coordination of various raw materials, the curable temperature range of the material is broadened, the temperature requirements for the construction environment are reduced, and cold mixing construction can be carried out normally even in cold conditions, solving the problem that the existing cold-mix epoxy asphalt material still needs to be heated before paving during construction and the overall performance of the material is insufficient.

[0016] Preferably, the fatty acid methyl ester is commercially available C8~C 12 A mixture of fatty acid methyl esters. The number average molecular weight of the unsaturated fatty acid is ≤400, and the unsaturated fatty acid is a mixture of one or more of ricinoleic acid, palmitoleic acid and soybean oleic acid.

[0017] Preferably, the asphalt diluent is at least one of fatty acid methyl ester and trichloroethylene. Fatty acid methyl ester is a commercially available C8-C 12 A mixture of fatty acid methyl esters.

[0018] The epoxy resin diluent is at least one of polypropylene glycol diglycidyl ether and decyl glycidyl ether. The epoxy value of polypropylene glycol diglycidyl ether is 0.34eq / 100g. The molecular formula of decyl glycidyl ether is C 36 H 72 O6, molecular weight is 600.95.

[0019] Preferably, the mass ratio of asphalt, asphalt diluent, curing agent and compatibilizer is 60:20-60:22-80:7-30; the mass ratio of component A to component B is 100:100-200. The present invention broadens the curable temperature range of the material and reduces the temperature requirement for the construction environment by complementing the performance of each raw material and controlling the dosage.

[0020] In the present invention, the asphalt is evenly distributed in the epoxy resin in an "island structure", indicating that the material has good compatibility. This distribution structure plays an important role in improving the overall performance of the material. The asphalt phase can disperse external forces and prevent the expansion of cracks, while the epoxy resin provides a high-strength matrix support. The two work synergistically, allowing the material to have better toughness while maintaining high strength.

[0021] Preferably, the mass ratio of epoxy resin, epoxy resin diluent and polyurethane prepolymer is 100:30-50:5-15. In the present invention, too high a dosage of polyurethane prepolymer will lead to too fast curing and insufficient construction time, so the dosage of polyurethane prepolymer should not be too high.

[0022] Preferably, the epoxy resin is a liquid bisphenol A glycidyl ether epoxy resin. Specifically, the epoxy resin is an E51 epoxy resin with an epoxy value of 0.48 to 0.54 eq / 100 g.

[0023] The polyurethane prepolymer is an MDI type polyurethane prepolymer purchased from Shandong Aolilong Chemical Co., Ltd., with a purity of 98%. The mass percentage of -NCO in the MDI type polyurethane prepolymer is 18% to 20%.

[0024] Preferably, the asphalt is 70# base asphalt or 90# base asphalt.

[0025] Preferably, the curing agent is at least one of a phenolic amine curing agent and a polyamide curing agent. Preferably, the curing agent is a polyamide 651 curing agent or a T31 curing agent. T31 curing agent belongs to a phenolic amine curing agent. Polyamide 651 curing agent belongs to a polyamide curing agent. The curing agent selected by the present invention can enable the epoxy resin to complete the curing reaction at room temperature.

[0026] Preferably, the compatibilizer is at least one of epoxy soybean oil, epoxy stearic acid, epoxy linoleic acid and polyepoxy stearic acid. The compatibilizer is preferably epoxy soybean oil.

[0027] Preferably, the temperature at which the asphalt is heated to a molten state is 110°C to 130°C, more preferably 120°C.

[0028] The second aspect of the present invention provides a room temperature polyurethane-epoxy modified asphalt pavement repair material, which is prepared by the preparation method described in the first aspect.

[0029] The application method of the room temperature repair material of the polyurethane-epoxy modified asphalt pavement of the present invention is: firstly prepare component A and component B, and then respectively put the prepared component A and component B into two independent sealed containers, such as plastic, glass or iron containers. Pay attention to tightly sealing, isolating from air, and storing in a place away from fire sources or smoking places.

[0030] When used, component A and component B are mixed and stirred fully, for example, stirred rapidly at a rate of 500 to 1000 rpm for 3 to 5 minutes to obtain a polyurethane-epoxy modified asphalt pavement normal temperature repair material. The prepared polyurethane-epoxy modified asphalt pavement normal temperature repair material is directly laid, or mixed with aggregate stone and laid on the pavement diseased area.

[0031] No prior preparation is required for construction. Construction can be carried out after mixing the two prepared components. The construction is simple and quick, which not only meets the repair needs of asphalt pavement at room temperature, but also maintains the performance indicators of asphalt pavement.

[0032] Beneficial effects of the present invention:

[0033] 1. The present invention uses polyurethane prepolymer and epoxy resin to modify asphalt. Epoxy resin contains active functional groups that can undergo curing and crosslinking, and can undergo gelation reaction to form a stable and uniform crosslinked phase with asphalt in thermodynamics. The polyurethane prepolymer introduces flexible segments in the crosslinking system to improve the toughness of the system. The polyurethane-epoxy resin composite modification greatly enhances the mechanical properties of asphalt. Through the complementary performance of each raw material, the curable temperature range of the material is broadened, the temperature requirements for the construction environment are reduced, and cold-mix construction can be carried out normally even under cold conditions, solving the problem that the existing cold-mix epoxy asphalt material still needs to be heated before laying during construction and the overall performance of the material is insufficient.

[0034] 2. The performance of the room temperature repair material of the polyurethane-epoxy modified asphalt pavement of the present invention is better than that of the common asphalt pavement repair materials on the market, and it has excellent toughness and high temperature stability, and is suitable for repairing various road diseases.

[0035] 3. The room temperature repair material of the polyurethane-epoxy modified asphalt pavement of the present invention can not only solve the problems of asphalt road repair materials in performance and application, but also reduce smoke emissions during asphalt material construction, provide material alternatives and technical references for cold mix epoxy asphalt paving technology for high-grade highways, simplify the paving process of asphalt pavement repair, reduce repair costs and energy consumption, while improving the repair quality and extending the service life of the asphalt pavement. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a fluorescence micrograph of the room temperature polyurethane-epoxy modified asphalt pavement repair material prepared in Example 1.

[0037] Figure 2 This is a fluorescence micrograph of the room temperature polyurethane-epoxy modified asphalt pavement repair material prepared in Example 2. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0040] The present invention provides a method for preparing a room temperature repair material of a polyurethane-epoxy modified asphalt pavement, wherein the room temperature repair material of the polyurethane-epoxy modified asphalt pavement comprises component A and component B, wherein component A is mainly prepared by mixing epoxy resin, diluent and polyurethane prepolymer, and component B is mainly prepared by mixing base asphalt, asphalt diluent, curing agent and compatibilizer. The present invention modifies asphalt by polyurethane prepolymer and epoxy resin, the epoxy resin contains active functional groups that can undergo curing and crosslinking, can undergo gelation reaction and form a stable and uniform crosslinked phase with asphalt in thermodynamics, and the polyurethane prepolymer introduces a flexible segment in the crosslinking system to improve the toughness of the system, and the polyurethane-epoxy resin composite modification greatly enhances the mechanical properties of asphalt. The modified asphalt repair material of the present invention has better performance than the common asphalt pavement repair materials on the market, has excellent toughness and high temperature stability, and is suitable for repairing various pavement diseases.

[0041] Specifically, a method for preparing a room temperature repair material for a polyurethane-epoxy modified asphalt pavement comprises the following steps:

[0042] Preparation of component A: epoxy resin, diluent and polyurethane prepolymer are mixed, heated to 40° C. to 60° C., stirred at a rate of 200 rpm to 500 rpm for 0.5 hour to 3 hours, and cooled to room temperature to obtain component A.

[0043] Preparation of component B: heat the asphalt to 120°C to melt, weigh the asphalt and the diluent and mix them, and stir at a rate of 500 to 2000 rpm until the asphalt is completely dissolved; cool to below 40°C, add the curing agent and the compatibilizer, and stir at a rate of 300 to 1000 rpm until uniformly mixed to obtain component B.

[0044] Place the prepared component A and component B separately in two sealed containers, seal them tightly, isolate them from air, and store them away from fire sources or smoking places.

[0045] The specific application method is: when using, mix component A and component B at room temperature, and stir rapidly at a rate of 500 to 1000 rpm for 3 to 5 minutes to obtain a normal-temperature polyurethane-epoxy modified asphalt pavement repair material. The mixed normal-temperature polyurethane-epoxy modified asphalt pavement repair material is directly laid or mixed with aggregate stone and laid on the road surface diseased area.

[0046] The material of the present invention has a simple construction process, uses an amine curing agent, can be mixed and constructed at room temperature, is suitable for various climatic conditions, and can normally repair the road surface even in high-cold areas. Compared with traditional processes, it not only simplifies the construction process, but also has significant energy-saving and environmental protection effects. No cumbersome preliminary preparations are required, and the construction time is greatly shortened. After the repair is completed, only short-term maintenance is required to open traffic immediately, effectively alleviating the traffic pressure caused by road pothole repair construction, and greatly improving construction efficiency and convenience.

[0047] The present invention utilizes interpenetrating network cross-linking technology and uses polyurethane-epoxy composite modified asphalt materials to significantly improve the flexibility of the material while ensuring the strength of the material. This modification technology enables epoxy resin and polyurethane prepolymer to form a stable interpenetrating network structure, enhances the compatibility and synergy between the two, thereby improving the crack resistance and durability of the material, strengthening the adhesion and bonding force between the stone and the road surface, and can effectively prevent the repair material from falling off or being worn by wheels.

[0048] The present invention improves the interface characteristics of asphalt and epoxy resin and reduces the emission of volatile toxic substances by introducing epoxidized soybean oil as an environmentally friendly compatibilizer, which not only reduces material costs but also achieves good environmental benefits. The improved compatibility enables the material to have good low-temperature flexibility and high-temperature stability. Whether it is used for road maintenance or disease repair, it can significantly increase the service life of the road and reduce the occurrence of secondary diseases.

[0049] The technical solution of the present invention is further described below by means of specific examples. In the following examples, the methods described are conventional methods unless otherwise specified; the reagents and materials described are commercially available unless otherwise specified.

[0050] In the following embodiments, the asphalt is 70# base asphalt or 90# base asphalt purchased from Nantong Tongsha Asphalt Technology Co., Ltd.

[0051] The epoxy resin is a liquid bisphenol A glycidyl ether epoxy resin, referred to as bisphenol A epoxy resin, the full English name is Diglycidyl Ether of Bisphenol A, abbreviated as DGEBA, specifically E51 epoxy resin, purchased from Kunshan Jiulimei Electronic Materials Co., Ltd., with a density of 1.167 g / cm at 15°C. 3, viscosity at 25°C is 7000-9000mPa·s, flash point is 280°C, epoxy value is 0.48-0.54eq / 100g, organic chlorine value is 0.02 equivalent / 100g, and water content is 0.02%.

[0052] Decyl glycidyl ether was purchased from Wuhan Smik Biotechnology Co., Ltd., with a molecular formula of C 36 H 72 O6, molecular weight is 600.95, density at 25℃ is 0.9g / cm 3 .

[0053] The MDI type polyurethane prepolymer was purchased from Shandong Olilong Chemical Co., Ltd. with a purity of 98%. The -NCO mass percentage content of the MDI type polyurethane prepolymer was 20%.

[0054] Fatty acid methyl ester, purchased from Guangzhou Fufei Chemical Technology Co., Ltd., density at 25 °C is 0.868 g / cm 3 , content 99%. Fatty acid methyl ester is commercially available C8~C 12 A mixture of fatty acid methyl esters.

[0055] T31 curing agent is an epoxy resin curing agent with an amine value of 460-550 mgKOH / g, purchased from Guangzhou Suixin Chemical Co., Ltd.

[0056] Epoxidized soybean oil, purchased from Shandong Narmei New Materials Group Co., Ltd., epoxy value 6.03, flash point 292, light yellow transparent liquid; molecular formula C 57 H 106 O 10 , molecular weight 950.

[0057] Polypropylene glycol diglycidyl ether was purchased from Zhangjiagang Yuanbang Chemical Materials Co., Ltd., with a viscosity of 25-90 mPa·s at 25°C and an epoxy value of 0.34 eq / 100 g.

[0058] Polyamide 651 curing agent, low molecular weight, purchased from Changzhou Runxiang Electronic Technology Co., Ltd., model DY300, amine value of 300±20mgKOH / g; viscosity of 8000-12000.

[0059] Trichloroethylene was purchased from Shandong Yinglang Chemical Co., Ltd., analytical grade.

[0060] In the following examples, the room temperature is 20°C to 30°C.

[0061] Example 1

[0062] A method for preparing a room-temperature repair material for a polyurethane-epoxy modified asphalt pavement comprises the following steps:

[0063] Step 1, 100g E51 epoxy resin, 30g decyl glycidyl ether, and 5g MDI polyurethane prepolymer with a -NCO mass percentage of 20% are stirred at 60°C and 500 rpm for 0.5 hour, and cooled to room temperature to obtain component A.

[0064] Step 2, heat 60g 70# base asphalt to 120°C to completely melt it, add 30g fatty acid methyl ester, stir at 2000 rpm for 10 minutes until the asphalt is fully diluted, cool to below 40°C, add 22.5g T31 curing agent and 7.5g epoxidized soybean oil, stir at 1000 rpm for 15 minutes, cool to room temperature, and obtain component B.

[0065] 100 g of component A and 100 g of component B were mixed at room temperature and stirred at a rate of 1000 rpm for 3 minutes to obtain a polyurethane-epoxy modified asphalt pavement room temperature repair material.

[0066] Example 2

[0067] A method for preparing a room-temperature repair material for a polyurethane-epoxy modified asphalt pavement comprises the following steps:

[0068] Step 1, 100g E51 epoxy resin, 40g polypropylene glycol diglycidyl ether, and 5g MDI polyurethane prepolymer with a -NCO mass percentage of 20% are stirred at 60°C and 300 rpm for 1 hour, and cooled to room temperature to obtain component A.

[0069] Step 2, heat 60g 70# base asphalt to 120°C to completely melt it, add 30g trichloroethylene, stir at 1000 rpm for 10 minutes until the asphalt is fully diluted, cool to below 40°C, add 80g polyamide 651 curing agent and 20g epoxy soybean oil, stir at 500 rpm for 10 minutes, cool to room temperature, and obtain component B.

[0070] 100 g of component A and 200 g of component B were mixed at room temperature and stirred at a rate of 1000 rpm for 5 minutes to obtain a room temperature polyurethane-epoxy modified asphalt pavement repair material.

[0071] Example 3

[0072] A method for preparing a room-temperature repair material for a polyurethane-epoxy modified asphalt pavement comprises the following steps:

[0073] Step 1, 100g of E51 epoxy resin, 30g of polypropylene glycol diglycidyl ether, and 15g of MDI polyurethane prepolymer with a -NCO mass percentage of 20% are stirred at 40°C and 500 rpm for 2 hours, and then cooled to room temperature to obtain component A.

[0074] Step 2, heat 60g 90# base asphalt to 120°C to completely melt it, add 20g fatty acid methyl ester, stir at 1500 rpm for 15 minutes until the asphalt is fully diluted, cool to below 40°C, add 30g T31 curing agent and 20g epoxidized soybean oil, stir at 1000 rpm for 15 minutes, cool to room temperature, and obtain component B.

[0075] 100 g of component A and 150 g of component B were mixed at room temperature and stirred at a rate of 1000 rpm for 5 minutes to obtain a polyurethane-epoxy modified asphalt pavement room temperature repair material.

[0076] Example 4

[0077] A method for preparing a room-temperature repair material for a polyurethane-epoxy modified asphalt pavement comprises the following steps:

[0078] Step 1, stirring 100g of E51 epoxy resin, 50g of polypropylene glycol diglycidyl ether, and 10g of MDI polyurethane prepolymer with a -NCO mass percentage of 20% at 50°C and a rotation speed of 400 rpm for 3 hours, and cooling to room temperature to obtain component A.

[0079] Step 2, heat 60g of 70# base asphalt to 120°C to completely melt it, add 30g of trichloroethylene, stir at 500 rpm for 20 minutes until the asphalt is fully diluted, cool to below 40°C, add 60g of polyamide 651 curing agent and 30g of epoxy soybean oil, stir at 1000 rpm for 15 minutes, cool to room temperature, and obtain component B.

[0080] 100 g of component A and 120 g of component B were mixed at room temperature and stirred at a rate of 800 rpm for 4 minutes to obtain a polyurethane-epoxy modified asphalt pavement room temperature repair material.

[0081] Table 1 Raw material feeding of component A

[0082]

[0083] Note: “-” means not added.

[0084] Table 2 Raw material feeding of component B

[0085] raw material Example 1 Example 2 Example 3 Example 4 70# Base Asphalt 60g 60g - 60g 90# Base Asphalt - - 60g - Fatty acid methyl esters 30g - 20g - Trichloroethylene - 30g - 30g T31 Curing Agent 22.5g - 30g - Polyamide 651 curing agent - 80g - 60g Epoxidized soybean oil 7.5g 20g 20g 30g

[0086] Note: “-” means not added.

[0087] Table 3 Feeding conditions of component A and component B

[0088] raw material Example 1 Example 2 Example 3 Example 4 Component A 100g 100g 100g 100g Component B 100g 200g 150g 120g

[0089] Fluorescence microscopy observation and related performance tests were performed on the room temperature polyurethane-epoxy modified asphalt pavement repair material prepared in the above embodiment.

[0090] Test 1: Fluorescence microscopy.

[0091] Fluorescence microscopy observations were performed on the polyurethane-epoxy modified asphalt pavement repair materials prepared in Example 1 and Example 2. Figure 1 and Figure 2 .

[0092] Figure 1 This is a fluorescence micrograph of the room temperature polyurethane-epoxy modified asphalt pavement repair material prepared in Example 1. Figure 2 This is a fluorescence micrograph of the room temperature polyurethane-epoxy modified asphalt pavement repair material prepared in Example 2.

[0093] Depend on Figure 1 and Figure 2 It can be seen that the asphalt is evenly distributed in the epoxy resin in an "island structure", indicating that the material has good compatibility. This distribution structure plays an important role in improving the overall performance of the material. The asphalt phase can disperse external forces and prevent the expansion of cracks, while the epoxy resin provides a high-strength matrix support. The synergistic effect of the two enables the material to have better toughness while maintaining high strength. The difference between the polyurethane prepolymer and the epoxy resin cannot be observed from the fluorescence micrograph, but from the experimental results, too high a dosage of the polyurethane prepolymer will lead to too fast curing and insufficient construction time.

[0094] Test 2: Related performance test.

[0095] Mechanical properties test:

[0096] The polyurethane-epoxy modified asphalt pavement room temperature repair materials prepared in Examples 1 to 4 were poured into corresponding tetrafluoroethylene molds, cured and maintained at room temperature for 48 hours, and demolded to obtain polyurethane-epoxy modified asphalt pavement room temperature repair material specimens, referred to as specimens. The prepared specimens are dumbbell-shaped specimens. The mechanical properties of the corresponding specimens were tested on a universal testing machine. The conditions for the mechanical properties test are: temperature 23°C ± 2°C, tensile rate 10mm / min. The tensile strength and elongation at break of the corresponding specimens were obtained by testing, and the test results are shown in Table 2.

[0097] Viscosity test:

[0098] The viscosity of the polyurethane-epoxy modified asphalt pavement room temperature repair materials prepared in the above Examples 1 to 4 was tested respectively by using a Brookfield viscometer. The test temperature was 25°C. The viscosity values ​​of the polyurethane-epoxy modified asphalt pavement room temperature repair materials were recorded to determine whether the polyurethane-epoxy modified asphalt pavement room temperature repair materials had good construction fluidity. The test results are shown in Table 2.

[0099] Adhesion test:

[0100] Adhesion test was conducted using a digital pull-off adhesion tester. A 20 mm spindle was used to prefabricate a 30 cm × 30 cm × 5 cm cement concrete slab. The polyurethane-epoxy modified asphalt pavement room temperature repair material prepared in the above Examples 1 to 4 was applied to the concrete slab. After room temperature curing for 36 hours, the AB glue was used to bond the pulling head on the surface of the specimen. After the AB glue was completely cured for 24 hours and reached the required strength, the test could be conducted. The test results are shown in Table 4.

[0101] Table 4 Related performance test results

[0102]

[0103] As shown in Table 2, the polyurethane-epoxy modified asphalt pavement room temperature repair materials prepared in Examples 1 to 4 of the present invention exhibit excellent construction performance, especially in operation at room temperature. The retention time of the material is at least 35 minutes, far exceeding the construction time standard of more than 30 minutes required by the specification. This feature ensures that under normal temperature conditions, construction personnel have sufficient time to mix, lay and level the materials, greatly improving the flexibility and operability of the construction.

[0104] After being fully cured, the material exhibits excellent mechanical properties. The tensile strength of the specimen can reach 2.45MPa, which fully proves the high strength characteristics of the material. At the same time, the elongation at break of the specimen is as high as 166.05%, which reflects the excellent toughness of the material. This enables the material to not only withstand repeated rolling by road vehicles, but also effectively prevent the road surface from cracking or being damaged again after repair, significantly extending the service life of the road.

[0105] In summary, the embodiment of the present invention uses polyurethane prepolymer and epoxy resin to modify the asphalt repair material, so that it has the excellent strength and high temperature performance of epoxy resin, and has the flexibility and anti-aging performance of polyurethane material. The introduction of room temperature curing agent and diluent also makes the material have the advantage of being able to be laid at room temperature, so that the road repair work is not restricted by rainy and snowy weather, and the construction does not require pre-preparation, the operation is simple, the construction time is short, and the traffic can be opened after a short period of maintenance.

[0106] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a room temperature repair material for a polyurethane-epoxy modified asphalt pavement, characterized in that: The following steps are involved: The epoxy resin, epoxy resin diluent and polyurethane prepolymer are stirred and mixed at 40-60° C. to obtain component A; After heating the asphalt to a molten state, the asphalt is mixed with an asphalt diluent, and after cooling to below 40°C, a curing agent and a compatibilizer are added, and the mixture is stirred and mixed to obtain component B; The component A and the component B are stirred and mixed to obtain a polyurethane-epoxy modified asphalt pavement room temperature repair material; The epoxy resin diluent is 1,6-hexanediol diglycidyl ether, polypropylene glycol diglycidyl ether, C 12 -C 14 At least one of alkyl glycidyl ether, benzyl glycidyl ether and decyl glycidyl ether; The asphalt diluent is at least one of fatty acid methyl ester, trichloroethylene, unsaturated fatty acid, acetone, toluene, dibutyl phthalate and dioctyl phthalate; The curing agent is at least one of aliphatic amine curing agents, phenolic amine curing agents and polyamide curing agents.

2. The method for preparing the room temperature repair material of polyurethane-epoxy modified asphalt pavement according to claim 1, characterized in that: The mass ratio of asphalt, asphalt diluent, curing agent and bulking agent is 60:20-60:22-80:7-30; The mass ratio of component A to component B is 100:100-200.

3. The method for preparing the normal temperature repair material of polyurethane-epoxy modified asphalt pavement according to claim 1, characterized in that: The mass ratio of epoxy resin, epoxy resin diluent and polyurethane prepolymer is 100:30-50:5-15.

4. The method for preparing the room temperature repair material of polyurethane-epoxy modified asphalt pavement according to claim 1, characterized in that: The epoxy resin is a liquid bisphenol A glycidyl ether epoxy resin; the polyurethane prepolymer is an MDI polyurethane prepolymer, and the mass percentage of -NCO in the MDI polyurethane prepolymer is 18% to 20%.

5. The method for preparing the room temperature repair material of polyurethane-epoxy modified asphalt pavement according to claim 1, characterized in that: The asphalt is 70# base asphalt or 90# base asphalt.

6. The method for preparing the room temperature repair material of polyurethane-epoxy modified asphalt pavement according to claim 1, characterized in that: The curing agent is polyamide 651 curing agent or T31 curing agent.

7. The method for preparing the room temperature repair material of polyurethane-epoxy modified asphalt pavement according to claim 1, characterized in that: The compatibilizer is at least one of epoxy soybean oil, epoxy stearic acid, epoxy linoleic acid and polyepoxy stearic acid.

8. The method for preparing the room temperature repair material of polyurethane-epoxy modified asphalt pavement according to claim 1, characterized in that: The temperature at which asphalt is heated to a molten state is 110°C to 130°C.

9. A polyurethane-epoxy modified asphalt pavement room temperature repair material, characterized in that: The preparation method is described in any one of claims 1 to 8.

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