Silane polyether-based water-excited cold-patch recycled asphalt material and preparation method thereof

Abstract

The invention belongs to the technical field of road engineering materials, and provides a silane polyether-based water-excited cold-patch recycled asphalt material and a preparation method thereof. The material is prepared from the following raw materials in parts by weight: 5 to 25 parts of silane modified polyether resin, 90 to 100 parts of matrix asphalt, 0.5 to 3 parts of triallyl isocyanurate (TAIC) and 15 to 35 parts of diluent. The silane-terminated polyether is used as a matrix, and can be cured at normal temperature through a water-excited cross-linking reaction, so that the early-stage viscosity and toughness, complex modulus and rut factor of the cold patch material can be improved, and the cold patch material has construction adaptability and environmental friendliness. The introduction of the TAIC is beneficial to promoting the reactivity reconstruction and network recovery of the aged SBS phase and improving the viscoelasticity of the regenerated asphalt. The diluent is composed of naphthenic oil, epoxidized soybean oil, polyisobutene, a nonionic surfactant and a polar cosolvent, and not only can dilute asphalt, but also can adjust the component balance of aged asphalt. The obtained material has excellent construction performance, early-stage viscosity and toughness, rheological property and regeneration and repair capacity, and is suitable for old road repair and regeneration and green road construction.

Description

Technical Field

[0001] This invention belongs to the field of road engineering materials technology, specifically relating to a silane polyether-based water-activated cold patching recycled asphalt material and its preparation method. Background Technology

[0002] With the continuous development of road maintenance and recycling technologies, cold-patch asphalt has been widely used in municipal roads, bridge repair, and emergency repairs due to its advantages such as simple construction, no heating required, and ability to be stored and used at room temperature. Traditional cold-patch asphalt often uses a solvent-based system, that is, using petroleum solvents (such as diesel, kerosene, or solvent oil) as diluents to disperse or dissolve the base asphalt at room temperature to obtain fluidity. Although this type of material can meet the construction requirements in the initial stage of use, its curing mainly depends on the solvent evaporation process, resulting in problems such as solvent residue, insufficient bonding performance, and low early strength. At the same time, a large amount of organic solvents evaporate during production, storage, and construction, which can easily cause environmental pollution and safety hazards, and its storage stability is also poor.

[0003] To reduce solvent use and improve environmental performance, water-activated cold patching materials have emerged in recent years. These systems typically involve introducing water-reactive resins or polyesters, which cure into a film through hydrolysis and condensation at room temperature, exhibiting good environmental friendliness and construction adaptability. However, SBS-modified asphalt is widely used as a surface or bonding layer material in existing road structures, and recycled asphalt mixtures (RAP) recovered from abandoned old pavements also commonly contain aged SBS-modified asphalt. Traditional water-activated and solvent-based cold patching materials are designed primarily for cold-mix construction and flowability control, without fully considering the interaction with aged SBS-modified asphalt in old pavements or RAP materials. Their curing mechanism mainly relies on physical encapsulation or interfacial bonding, lacking effective chemical repair capabilities for the molecular structure of aged asphalt. Because aged SBS is prone to oxidation, cross-linking, and chain scission reactions during long-term service, its elasticity, ductility, and bonding properties significantly decrease. Existing cold patching systems struggle to rebuild their original molecular network structure, thus limiting the effectiveness of recycling and the overall performance improvement of the recycled layer.

[0004] Because existing cold patch materials cannot achieve compatibility with aged asphalt, they can typically only be used in conjunction with new aggregates in practical applications, failing to consider the impact of actual aged asphalt and other waste pavement materials. This hinders the promotion of resource recycling and green road construction. In summary, there is an urgent need for a cold patch recycled asphalt material that combines water-activated curing properties with the ability to repair aged asphalt. This material should be able to achieve rapid curing at room temperature while simultaneously repairing aged SBS modified asphalt, thereby improving the bond strength, ductility, and durability of the recycled layer and meeting the needs of environmentally friendly road construction. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing solvent-based cold patch asphalt and water-activated cold patch materials in terms of environmental performance and recyclability, and to provide a silane polyether-based water-activated cold patch recycled asphalt material and its preparation method. This material not only achieves rapid curing at room temperature and possesses excellent construction adaptability and environmental performance, but also, when mixed with RAP materials containing aged asphalt, restores the performance of aged SBS modified asphalt through specific recycled components, significantly improving the elasticity of the recycled layer, thereby promoting the efficient reuse of old asphalt materials.

[0006] To achieve the above objectives, the present invention provides a silane polyether-based water-activated cold patching recycled asphalt material, prepared from the following raw materials in parts by mass: 5 to 25 parts of silane-modified polyether resin (preferably 20 parts); 90-100 parts of base bitumen (preferably 100 parts). Triallyl isocyanurate (TAIC) 0.5 to 3 parts (preferably 1 part); 15-35 parts of diluent (preferably 20 parts); The diluent includes naphthenic oil, epoxidized soybean oil, polyisobutylene, nonionic surfactant, and polar cosolvent, which are used to dilute asphalt and adjust the ratio of saturated components, aromatic components, resins, and asphaltenes in aged asphalt, thereby improving the compatibility and dispersibility of polar and nonpolar components.

[0007] The triallyl isocyanurate (TAIC) in the system promotes the reactive reconstruction and network recovery of the aged SBS phase, thereby improving the elasticity and ductility of the recycled asphalt.

[0008] Furthermore, the silane-modified polyether resin is a silane-terminated polyether, which is cured at room temperature through a hydrolysis-condensation reaction in the presence of water; the end group of the silane-terminated polyether is selected from at least one of methoxysilane, ethoxysilane and isopropoxysilane (preferably methoxysilane).

[0009] Furthermore, the silane-modified polyether resin is one or more of the following: KANEKA SAX510 resin, SAX520 resin, SAX750 resin, S203H resin, S303H resin, and AGC S5830E resin, S888E resin, and S2410E resin.

[0010] Furthermore, the base asphalt is at least one of 50#, 70# and 90# base asphalt (preferably 70#).

[0011] Furthermore, the nonionic surfactant is polyoxyethylene-polyoxypropylene block copolymer Pluronic L61, and the polar cosolvent is N,N-dimethylformamide (DMF).

[0012] Furthermore, in the diluent, the mass ratio of naphthenic oil, epoxidized soybean oil, polyisobutylene, nonionic surfactant Pluronic L61, and N,N-dimethylformamide is (2-4):(1-2):(1-3):(0.1-1):(0.5-2) (preferably 3.0:1.5:2.0:0.5:1.0).

[0013] The present invention also provides a method for preparing the above-mentioned silane polyether-based water-activated cold patching recycled asphalt material, comprising the following steps: (1) Base asphalt pretreatment: The base asphalt is heated to 120-160℃ (preferably 140℃) and kept in a flowing state under stirring conditions to obtain hot asphalt; (2) Preparation of cold patch diluted asphalt: Add diluent and triallyl isocyanurate TAIC to the hot asphalt obtained in step (1) in sequence, and stir evenly at 90-160℃ (preferably 140℃) to obtain cold patch diluted asphalt containing TAIC; (3) Preparation of silane polyether-based cold patch recycled asphalt mother liquor: After cooling the TAIC-containing cold patch diluted asphalt obtained in step (2) to room temperature, add silane-modified polyether resin, stir evenly to obtain silane polyether-based cold patch recycled asphalt mother liquor, namely silane polyether-based water-activated cold patch recycled asphalt material.

[0014] Furthermore, in step (2), the stirring speed is controlled at 300-800 rpm (preferably 500 rpm); the stirring time is 15-30 minutes (preferably 30 minutes); and the diluent is added in several batches (preferably in three batches).

[0015] This invention also provides an application of the above-mentioned silane polyether-based water-activated cold patch recycled asphalt material in the recycling and repair of old pavements, cold patch construction, and green road construction.

[0016] Furthermore, the curing is carried out at 5~35℃ and under the action of moisture, triggered by ambient humidity or an external water source, and the curing time is 2~24 hours (preferably 24 hours under room temperature and 95% relative humidity conditions).

[0017] Compared with the prior art, the technical solution of the present invention has the following advantages and beneficial technical effects: (1) Excellent environmental performance: The water-activated cross-linking curing system is adopted, which does not require volatile organic solvents, thus avoiding environmental pollution and construction safety hazards caused by solvent volatilization, and meeting the requirements of green road construction.

[0018] (2) Strong regeneration and repair capabilities: The introduction of triallyl isocyanurate (TAIC) as a reactive regenerator in the system is beneficial to promoting the reactive reconstruction and network recovery of the aged SBS phase, and significantly improving the elasticity and durability of the regenerated layer.

[0019] (3) Improved compatibility and flowability: The diluent system improves the compatibility and dispersibility between aged asphalt and the newly formed polyether matrix by adjusting the ratio of the four components of asphalt, so that the system has good construction flowability and storage stability.

[0020] (4) Room temperature curing and efficient construction: The silane polyether matrix can be rapidly cured by water activation at room temperature. It has a short initial setting time and high early strength, which can meet the needs of rapid repair in low temperature and humid environments.

[0021] (5) Significant resource utilization: This material can be directly used for cold patching and recycling of RAP material during the preparation of cold patching material, without the need for high-temperature heating or replacement of new aggregates, which greatly improves the utilization rate of waste asphalt and has good economic and social benefits.

[0022] In summary, this invention achieves the organic unity of room temperature construction, rapid curing, and aged asphalt regeneration repair through a synergistic technical route of "silane polyether water-activated curing + TAIC reactive repair + composite diluent adjustment system". It solves the problems of serious environmental pollution and slow curing of traditional solvent-based cold patch materials, as well as the inability of existing water-activated cold patch materials to repair RAP aged asphalt. It has significant innovation and application value. Attached Figure Description

[0023] Figure 1 The infrared spectra of the silane polyether-based water-activated cold patch recycled asphalt material (uncured) prepared in step (4) of Example 1 of the present invention and the material obtained after curing in step (5) are compared with those of the material prepared in Comparative Example 1. Figure 2 This is a comparison of the infrared spectra of the materials prepared in Example 1 and Comparative Example 2 of the present invention; Figure 3 This is a comparison of the infrared spectra of the materials prepared in Example 1 and Comparative Example 3 of the present invention; Figure 4 This is a comparison of the infrared spectra of the materials prepared in Example 1 and Comparative Example 4 of the present invention. Detailed Implementation

[0024] To further illustrate the technical solution of the present invention, the following detailed description of the silane polyether-based water-activated cold patching recycled asphalt material and its preparation method is provided in conjunction with specific embodiments. However, it should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0025] Unless otherwise specified, all raw materials used in the embodiments are commercially available conventional raw materials, and the technical means used are conventional means well known to those skilled in the art.

[0026] The silane-modified polyether resin used in the embodiments and comparative examples of this invention is AGC S888E resin.

[0027] All parts in this invention are by weight, and each part has the same weight. In the following examples and comparative examples, each part weighs 5g and the room temperature is 25°C.

[0028] Example 1 A method for preparing a silane polyether-based water-activated cold patching recycled asphalt material includes the following steps: (1) Pretreatment of base asphalt Take 100 parts of base asphalt (70#), place it in a reaction vessel and heat it to 140°C. Maintain its flow state at a stirring rate of 300 rpm to obtain hot asphalt.

[0029] (2) Preparation of composite diluent Naphthenic oil (4006, kinematic viscosity: 53.53 cSt at 40℃, the same below), epoxidized soybean oil (ESBO-6.6, the same below), polyisobutylene (average molecular weight Mn~1300, the same below), nonionic surfactant Pluronic L61 (polyoxyethylene-polyoxypropylene block copolymer, BASF, the same below) and N,N-dimethylformamide were mixed in a mass ratio of 3.0:1.5:2.0:0.5:1.0 and stirred evenly at 300 rpm at 60℃ to obtain a composite diluent.

[0030] (3) Preparation of cold-mixed diluted asphalt In step (1), 25 parts of composite diluent are slowly added to the hot asphalt in three portions. The temperature is maintained at 140°C and the mixture is stirred continuously at 500 rpm for 15 minutes until the system is homogeneous. Then, 2 parts of triallyl isocyanurate (TAIC) are added to the homogeneous system and stirred for another 15 minutes under the same conditions to obtain cold patch diluted asphalt containing TAIC.

[0031] (4) Add silane-modified polyether resin The TAIC-containing cold patch diluted asphalt was naturally cooled to room temperature. Ten parts of silane-modified polyether resin were slowly added while stirring at 300 rpm. After the addition was complete, the mixture was continuously stirred at 300 rpm for 30 minutes to obtain a uniform silane polyether-based cold patch recycled asphalt mother liquor, which was then sealed and stored.

[0032] (5) Curing and molding The obtained silane polyether-based cold patch recycled bitumen mother liquor was exposed to air alone and cured for 24 hours at room temperature and 95% relative humidity.

[0033] Example 2 Performance verification under different formulation ratios The preparation method in this embodiment is basically the same as that in Example 1, except for the proportion of each component, as follows: The dosage of each component is based on 100 parts by weight of the base asphalt: The amount of composite diluent added in step (3) is 20 parts; The amount of TAIC added in step (3) is 1 unit; The amount of silane-modified polyether resin added in step (4) is 20 parts.

[0034] Example 3 Performance verification under different formulation ratios The preparation method of this embodiment is basically the same as that of Example 1, except that the content of surfactant and the ratio of each component in the composite diluent in step (2) are different.

[0035] Specifically: In step (2), the mass ratio of each component in the composite diluent is adjusted to: the mass ratio of naphthenic oil, epoxidized soybean oil, polyisobutylene, nonionic surfactant Pluronic L61 and N,N-dimethylformamide is changed to 3.0:1.5:2.0:0.3:1.0.

[0036] The dosage of each component is based on 100 parts by weight of the base asphalt: In step (3), the amount of the added composite diluent is 15 parts; In step (3), 1.5 parts of TAIC are added; In step (4), 15 parts of silane-modified polyether resin are added.

[0037] Comparative Example 1: Traditional solvent-based cold patching material This comparative example provides a traditional solvent-based cold patching system.

[0038] 1. Material composition: The traditional solvent-based cold patching asphalt system is adopted: base asphalt (70#): 100 parts; solvent oil (200# solvent oil): 35 parts.

[0039] 2. Preparation method: 100 parts of base asphalt were heated to 130°C and melted into a fluid state by stirring at 300 rpm. 35 parts of solvent oil were added and stirred evenly under the same conditions. The mixture was then sealed and cooled to room temperature for later use, thus obtaining a traditional solvent-based cold patch asphalt mother liquor.

[0040] 3. Curing and molding: The conventional solvent-based cold patching asphalt mother liquor obtained in this comparative example was cured under the same conditions as in the embodiments of the present invention.

[0041] Comparative Example 2: TAIC-free silane polyether cold feed system This comparative example provides a silane polyether cold feed system without TAIC reactive regenerator.

[0042] 1. Material composition: Base asphalt: 100 parts; Composite diluent: 20 parts (its composition is: naphthenic oil, epoxidized soybean oil, polyisobutylene, Pluronic L61, N,N-dimethylformamide in a mass ratio of 3.0:1.5:2.0:0.3:1.0); Silane-modified polyether resin: 20 parts.

[0043] 2. Preparation method: The preparation method of this comparative example is basically the same as that of Example 2, except that TAIC is not added in step (3) during the preparation of cold patch diluted asphalt. The specific steps are as follows: (1) Pretreatment of base asphalt Take 100 parts of base asphalt (70#), place it in a reaction vessel and heat it to 140°C. Maintain its flow state under stirring at 300 rpm to obtain hot asphalt.

[0044] (2) Preparation of composite diluent Naphthenic oil, epoxidized soybean oil, polyisobutylene, nonionic surfactant Pluronic L61, and N,N-dimethylformamide were mixed in a mass ratio of 3.0:1.5:2.0:0.3:1.0 and stirred evenly at 300 rpm at 60°C to obtain a composite diluent.

[0045] (3) Preparation of cold-mixed diluted asphalt In step (1), 20 parts of composite diluent are slowly added to the hot asphalt in three batches. The temperature is maintained at 140℃ and the mixture is continuously stirred at 500 rpm until the system is homogeneous, thus obtaining cold-mixed diluted asphalt.

[0046] (4) Add silane-modified polyether resin The cold-mix diluted asphalt was naturally cooled to room temperature. 20 parts of silane-modified polyether resin were slowly added at a stirring rate of 300 rpm. After the addition was complete, the mixture was continuously mixed for 30 minutes at a mechanical stirring rate of 300 rpm to obtain a uniform silane polyether-based cold-mix asphalt mother liquor, which was then sealed and stored.

[0047] (5) Curing and molding The silane polyether-based cold patching asphalt mother liquor obtained in this comparative example was cured under the same conditions as in the embodiments of the present invention.

[0048] Comparative Examples 3-7: Component-Deficient Comparison Experiments To verify the functional synergistic relationship of the five-component diluent system, comparative examples 3-7 included component-deficient comparison experiments. Except for the change in the composition of the composite diluent described below, the experimental conditions were the same as in Example 2, including 100 parts of base asphalt, 1 part of triallyl isocyanurate (TAIC), 20 parts of composite diluent, and 20 parts of silane-modified polyether resin.

[0049] The complete formulation of the composite diluent (see Example 1) is naphthenic oil: epoxidized soybean oil: polyisobutylene: Pluronic L61: N,N-dimethylformamide = 3.0:1.5:2.0:0.5:1.0. To verify the synergistic effect of each component in the system, one component was removed from each of the comparative examples 3-7, while the proportions of the remaining four components remained unchanged. The specific composition is shown in Table 1 below.

[0050] Table 1. Composition of the composite diluents in Comparative Examples 3-7 Comparative Example 8: Epoxy Resin Curing Cold Patching System This comparative example provides a typical epoxy resin-cured cold patching system.

[0051] 1. Material composition: The following materials were selected: 100 parts of bisphenol A type epoxy resin E-51 (epoxy equivalent of about 0.51), 30 parts of aliphatic amine curing agent (polyamide curing agent, model 650), 10 parts of diluent (using 200# solvent oil), and 100 parts of matrix asphalt (70#).

[0052] 2. Preparation method: (1) Heat 100 parts of base asphalt to 130°C and keep it in a flowing state under stirring at 300 rpm to obtain hot asphalt; (2) In another container, mix 100 parts of epoxy resin E-51 with 10 parts of diluent until homogeneous; (3) Slowly add the mixture obtained in step (2) into the hot asphalt and stir at 300 rpm for 20 minutes at 130°C to fully disperse the epoxy resin E-51 in the asphalt system. (4) After cooling the system to below 60°C, slowly add 30 parts of aliphatic amine curing agent under stirring at 300 rpm, and mix evenly under mechanical stirring at 300 rpm to obtain epoxy cold patching mother liquor. (5) The obtained epoxy cold-mix mother liquor was left to stand at room temperature and cross-linked and cured through the chemical reaction of amine and epoxy groups. The curing time was 24 hours.

[0053] Comparative Example 9: Polyurethane-based cold patching system This comparative example provides a typical polyurethane-based cold patching system.

[0054] 1. Material composition: 100 parts of polyether polyol (PPG2000), 35 parts of polyisocyanate (MDI), 25 parts of diluent (a mixture of naphthenic oil and solvent oil at a mass ratio of 1:1), 100 parts of base bitumen (70#), and 5 parts of water-containing chain extender (ethylene glycol / water mixture, with ethylene glycol and water mixed at a mass ratio of 1:1).

[0055] 2. Preparation method: (1) Under the protection of an inert gas, 100 parts of polyether polyol and 35 parts of polyisocyanate were reacted at 80°C for 30 min to obtain NCO-terminated polyurethane prepolymer. (2) Heat 100 parts of base asphalt to 130°C and keep it in a flowing state under stirring at 300 rpm to obtain hot asphalt; (3) Cool the hot asphalt in step (1) to 90°C, slowly add 25 parts of diluent to the hot asphalt and stir evenly at a rate of 300 rpm, and then slowly add the NCO-terminated polyurethane prepolymer obtained at 90°C to the hot asphalt and continue stirring for 20 min to make the system uniform. (4) After cooling the mixture obtained in step (3) to room temperature, add 5 parts of water-containing chain extender and stir evenly to obtain polyurethane cold repair mother liquor. (5) The polyurethane cold patching mother liquor was left to stand at room temperature and then cured for 6 hours by isocyanate-hydroxy addition polymerization.

[0056] Performance testing The materials obtained in the aforementioned embodiments and comparative examples were subjected to performance tests. The test indicators were 24-hour visco-toughness test, 24-hour complex modulus, 24-hour rutting factor, and elastic recovery rate of recycled aged asphalt. The specific test methods are as follows: 1. 24-Hour Viscosity-Toughness Test: The test was conducted according to the requirements of "Asphalt Viscosity-Toughness Test" in T0624-2025 of the latest effective version of the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering". First, all materials in the system were thoroughly mixed according to the design ratio. After uniform mixing, the mixture was placed in a mold and allowed to cure at a constant temperature of 25℃ for 24 hours. After curing, the specimen was bonded to a standard steel plate and placed at 25℃ for 24 hours before a pull-out test. A pull-out testing machine with an accuracy of 0.01 kN was used, and the specimen was pulled at a constant tensile rate of 500 mm / min until it reached 300 mm or broke. The viscosity-toughness (N·m) and toughness (N·m) of the asphalt specimen were recorded.

[0057] 2. 24-hour complex modulus: The DSR test was performed according to the requirements of T0628-2011 "Dynamic Shear Modulus and Phase Angle Test (DSR Test) of Asphalt" in the latest effective version of "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering". After thoroughly mixing all materials according to the design ratio, the mixture was poured into a mold and cured at 25℃ for 24 hours. Then, the complex modulus (G) at 60℃ was tested using a dynamic shear rheometer. * ).

[0058] 3. 24-hour rutting factor: The DSR test was performed according to the requirements of T0628-2011 "Dynamic Shear Modulus and Phase Angle Test (DSR Test) of Asphalt" in the latest effective version of "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering". After thoroughly mixing all materials according to the design ratio, the mixture was poured into a mold and cured at 25℃ for 24 hours. Then, the rutting factor (G) at 60℃ was tested using a dynamic shear rheometer. * / sinδ).

[0059] 4. Elastic recovery rate of aged asphalt: The cold-mixed asphalt from the examples and comparative examples was added at a mass percentage of 10% to the PAV-aged asphalt. Then, the elastic recovery rate of each group of aged asphalt was tested according to the requirements of "Asphalt Elastic Recovery Test" in T0662-2000 of the latest effective version of the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering". The test temperature was 25℃.

[0060] 5. Chemical Structure Characterization Test: Infrared spectroscopy was performed on the samples obtained in Example 1 and Comparative Examples 1-4. The functional group structure of the samples was characterized using Fourier Transform Infrared Spectroscopy (FTIR). During the test, the samples were prepared according to conventional methods and placed in the infrared spectrometer for scanning at room temperature. The scanning wavenumber range was 600–4000 cm⁻¹. -1 The infrared absorption spectra of each sample within the wavenumber range were recorded, and the characteristic absorption peak positions and peak intensity changes of Example 1 and each comparative sample were compared and analyzed to evaluate the differences in functional group structure and component synergistic effect in different formulation systems.

[0061] The test results of each embodiment and comparative example are shown in Table 2.

[0062] Table 2 Test Results As shown in Table 2, the silane polyether-based water-activated cold-patch recycled asphalt material of this invention exhibits excellent viscosity, toughness, and rheological properties under different formulation ratios. Overall, Examples 1-3 are significantly superior to all comparative samples, indicating that the synergistic system of "silane polyether water-activated curing + TAIC chemical repair + composite diluent regulation" of this invention can form a dense, strongly adhesive, and highly elastic recycled asphalt material at room temperature. Compared with traditional solvent-based systems, the viscosity and toughness are generally improved by about 1.5 to 2.5 times, and the elastic recovery rate is improved by more than 20%.

[0063] Among them, Example 2 exhibits the most outstanding overall performance. The 24-hour viscosity and toughness of the system in Example 2 are 11.8 N·m, toughness is 6.4 N·m, composite rheological modulus G is 11.09 kPa, high-temperature deformation resistance index G* / sin δ is 13.55 kPa, and elastic recovery rate reaches 87%, achieving a good balance between bond strength, toughness, and elastic recovery. Example 1, due to its higher TAIC content, shows a more complete reaction in restoring the SBS structure, resulting in the highest elastic recovery rate (89%) for aged asphalt. However, due to the relatively high proportion of diluent, the system density is slightly lower, and the bond strength is relatively weaker. Example 3, with its higher silane polyether resin content and lower diluent content, has a denser structure after curing, exhibiting superior viscosity, toughness, and rheological properties. However, the degree of crosslinking is relatively limited, and the elastic recovery rate is 83%.

[0064] Comparative Example 1 is a traditional solvent-based cold patching system. Due to the lack of water-activated curing and chemical repair mechanisms, the material structure is loose, the interfacial bonding is poor, the visco-toughness is only 4.7 N·m, and the elastic recovery rate is 62%, which is significantly lower than the system of this invention. Although Comparative Example 2 uses a silane polyether matrix, it does not add TAIC reactive regenerator. The system only generates water-activated curing and does not repair the SBS structure, resulting in an elastic recovery rate of 71%. This indicates that TAIC plays a role in the chemical crosslinking repair of aged SBS segments.

[0065] Furthermore, comparative experiments with missing components in Examples 3–7 showed that when any component in the diluent system was missing, the material's viscosity, toughness, G* / sinδ, and elastic recovery rate all decreased significantly. The most significant decreases were observed in samples lacking cycloalkane oil (Comparative Example 3) and polyisobutylene (Comparative Example 5), with viscosity decreasing by approximately 30%–35% compared to Example 2, and elastic recovery rate dropping to 69%–72%. When epoxidized soybean oil or Pluronic L61 (Comparative Examples 4 and 6) was missing, polarity balance and dispersibility were impaired, and all properties decreased by 10%–20%. When DMF was missing (Comparative Example 7), the curing rate slowed, the structure became uneven, and the overall performance slightly decreased. The results indicate that cycloalkane oil provides flowability, epoxidized soybean oil regulates polarity, polyisobutylene imparts flexibility, Pluronic L61 stabilizes interfacial dispersion, and DMF promotes uniform reaction; the five-component system exhibits a significant synergistic effect in physical dilution, polarity balance, and interfacial stability.

[0066] In addition, to verify the differences between the silane polyether system and other chemically cured systems, comparative data of epoxy and polyurethane cold patching materials were supplemented (Comparative Examples 8 and 9). The 24-hour viscous toughness of the two was only 7.4 N·m and 8.0 N·m, respectively, with G* / sinδ of 9.10 kPa and 9.50 kPa, and elastic recovery rates of 68% and 70%, respectively, all significantly lower than the system of this invention. The reason for this is that the epoxy and polyurethane systems are two-component chemically cured systems, which are easily affected by humidity during curing and have high brittleness, making them unable to effectively chemically rebuild with aged asphalt. In contrast, the silane polyether system of this invention is a single-component water-activated curing system, using water as a trigger, which can self-crosslink and cure in a humid environment, while simultaneously achieving chemical repair with aged SBS molecules, forming a three-dimensional crosslinked network with both high strength and high toughness.

[0067] From infrared spectrum Figure 1 It can be seen that the unhydrated sample and the water-cured sample in Example 1 have similar properties at 2800–3000 cm⁻¹. -1 Both regions exhibited typical aliphatic CH stretching vibration absorption peaks characteristic of asphalt systems, indicating that the main organic matrix structures of both samples were essentially identical. After water curing, the samples showed absorption peaks at 3200–3600 cm⁻¹. -1 The nearby broad peaks are significantly enhanced, and the 1000–1200 cm peaks are particularly prominent. -1 The enhanced absorption in the fingerprint region indicates that the methoxysilane end groups in the silane-modified polyether resin undergo hydrolysis and further condensation under the action of water, forming a Si-O-Si network structure. In contrast, Comparative Example 1 did not show the corresponding characteristic changes, indicating that its curing mainly relies on solvent evaporation rather than chemical crosslinking.

[0068] Infrared spectroscopy Figure 2 This indicates that the difference between Example 1 and Comparative Example 2 mainly stems from the introduction of TAIC. Example 1, at 3070–3085 cm⁻¹, showed this difference.-1 1630–1650 cm -1 990~1005 cm -1 and 920–935 cm -1 The near-alkeny SBS exhibits significant characteristic absorptions corresponding to the =CH, C=C, and allyl vibrations. In contrast, Comparative Example 2, lacking TAIC, shows significantly weakened or even absent characteristic absorptions, indicating a deficiency of polyalkeny reactive functional groups. Based on the system composition, the introduction of TAIC facilitates its reaction with the unsaturated bonds or active sites of the aged SBS segments in the regenerated system, promoting SBS phase structure repair and network reconstruction, and enhancing the system's reactivity and structural integrity. In contrast, Comparative Example 2, lacking TAIC, struggles to form the aforementioned reactive structures, thus falling short of Example 1 in both regeneration repair and curing performance.

[0069] Infrared spectroscopy Figure 3 This indicates that the difference between Example 1 and Comparative Example 3 mainly stems from the presence of naphthenic oil. Example 1, at 2920–2930 cm⁻¹, showed a difference primarily due to the presence of naphthenic oil. -1 2850~2860 cm -1 1450~1465 cm -1 1370~1380 cm -1 and 720 cm -1 The absorption of aliphatic hydrocarbons in the vicinity is more pronounced, while the absorption in Comparative Example 3 is weakened, indicating that the lack of naphthenic oil reduces the amount of low-polarity hydrocarbons in the system.

[0070] Infrared spectroscopy Figure 4 This indicates that the difference between Example 1 and Comparative Example 4 mainly stems from the presence of epoxidized soybean oil. Example 1, at 1730–1740 cm⁻¹, showed a difference primarily due to the presence of epoxidized soybean oil. -1 1240~1255 cm -1 1150~1170 cm -1 1020~1045 cm -1 and 840-850cm -1 The presence of significant characteristic absorption in the vicinity indicates the presence of ester groups, COC, and epoxide-related functional groups in the system. In contrast, the characteristic absorption in Comparative Example 4 is significantly weakened, indicating that it lacks the polarity-regulating structure provided by epoxide soybean oil.

[0071] Comprehensive infrared spectroscopy experiments show that Example 1 exhibits more obvious infrared characteristics in terms of water-induced curing features, the unsaturated reaction structure introduced by TAIC, and the synergistic effect formed by naphthenic oil and epoxidized soybean oil in the composite diluent. This indicates that the system of the present invention has a more reasonable functional group composition and a more favorable structural basis for curing and molding.

[0072] In summary, the results demonstrate that this invention, through a synergistic technical route of "silane polyether water-activated curing + TAIC reactive repair + composite diluent regulation," achieves rapid curing, high adhesion, high toughness, and excellent elastic recovery performance of cold-patch recycled asphalt under ambient temperature conditions. Compared with traditional solvent-based and non-reactive systems, the material of this invention not only possesses significantly higher structural density and mechanical stability but also demonstrates outstanding environmental friendliness and recyclability, fully proving the scientific validity, innovation, and superior engineering application value of the proposed technical solution.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A silane polyether-based water-activated cold-patch recycled asphalt material, characterized in that, Prepared from the following raw materials, in parts by mass: 5-25 parts of silane-modified polyether resin; 90-100 parts of base bitumen; Triallyl isocyanurate (TAIC) 0.5–3 parts; 15-35 parts of diluent; The diluents include naphthenic oil, epoxidized soybean oil, polyisobutylene, nonionic surfactants, and polar cosolvents.

2. The silane polyether-based water-activated cold-patch regenerated asphalt material according to claim 1, characterized in that, The silane-modified polyether resin is a silane-terminated polyether, and the end group of the silane-terminated polyether is selected from at least one of methoxysilyl, ethoxysilyl and isopropoxysilyl.

3. The silane polyether-based water-activated cold-patch recycled asphalt material according to claim 1, characterized in that, The base asphalt is at least one of 50#, 70# and 90# base asphalt.

4. The silane polyether-based water-activated cold-patch recycled asphalt material according to claim 1, characterized in that, The nonionic surfactant is Pluronic L61, a block copolymer of polyethylene oxide and polypropylene oxide, and the polar cosolvent is N,N-dimethylformamide.

5. The silane polyether-based water-activated cold patching recycled asphalt material according to claim 4, characterized in that, The mass ratio of naphthenic oil, epoxidized soybean oil, polyisobutylene, nonionic surfactant Pluronic L61, and N,N-dimethylformamide in the diluent is (2-4):(1-2):(1-3):(0.1-1):(0.5-2).

6. A method for preparing a silane polyether-based water-activated cold-patch recycled asphalt material according to any one of claims 1 to 5, characterized in that, Includes the following steps: (1) Base asphalt pretreatment: The base asphalt is heated to 120-160℃ and kept in a flowing state under stirring conditions to obtain hot asphalt; (2) Preparation of cold patch diluted asphalt: Add diluent and triallyl isocyanurate TAIC to the hot asphalt obtained in step (1) in sequence, and stir evenly at 90-160℃ to obtain cold patch diluted asphalt containing TAIC. (3) Preparation of silane polyether-based cold patch regenerated asphalt mother liquor: After cooling the TAIC-containing cold patch diluted asphalt obtained in step (2) to room temperature, slowly add silane-modified polyether resin, stir evenly to obtain silane polyether-based cold patch regenerated asphalt mother liquor, namely silane polyether-based water-activated cold patch regenerated asphalt material.

7. The preparation method according to claim 6, characterized in that, The stirring speed in step (2) is controlled at 300-800 rpm; the stirring time is 15-30 minutes; and the diluent is added in several batches.

8. The application of the silane polyether-based water-activated cold patch recycled asphalt material according to any one of claims 1 to 5 or the silane polyether-based water-activated cold patch recycled asphalt material obtained by the preparation method according to any one of claims 6 to 7 in the recycling and repair of old pavements, cold patch construction and green road construction.

9. The application according to claim 8, characterized in that, The curing process is carried out at 5~35℃ and under the influence of moisture, triggered by ambient humidity or an external water source, and the curing time is 2~24 hours.

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