Epoxy resin material for epoxy asphalt and use method of epoxy resin material

Abstract

The invention relates to the technical field of epoxy asphalt, in particular to an epoxy resin material for epoxy asphalt and a using method thereof.The epoxy resin material comprises a component A and a component B which are mixed according to the mass ratio of 100: (50-90), and the epoxy equivalent in the component A and the amine equivalent in the component B are (1-1.1): 1; the component A comprises bisphenol A epoxy resin, modified epoxy resin, a reactive diluent and an interfacial compatibilizer in parts by mass; the component B comprises an alicyclic amine curing agent, a polyamide curing agent, a dynamic ionic cross-linking agent and an imidazole catalyst. Through scientific design and precise matching, the epoxy resin with the mechanical property, durability, flexibility, low-temperature adaptability and the like remarkably improved is prepared, the modified epoxy resin provides a flexible chain segment, a dynamic reversible cross-linked network is introduced into the dynamic ionic cross-linking agent, the anti-fatigue performance of the material is greatly improved, and the service life of the material is prolonged. And the requirements of high-dynamic load scenes such as bridge pavement are met.

Description

Technical Field

[0001] The present invention relates to the technical field of epoxy asphalt, and in particular to an epoxy resin material for epoxy asphalt and a method for using the same. Background Art

[0002] Epoxy asphalt, as a high-performance pavement material, is widely used in bridge paving, highway and tunnel waterproofing projects. However, the performance of epoxy asphalt composites depends on the type of epoxy resin and the compatibility of asphalt. In current technology, most epoxy resins are bisphenol A epoxy resins, which have weak interfacial bonding with asphalt and are prone to phase separation, thereby affecting the mechanical properties and service life of the composite material.

[0003] Furthermore, in bridge paving and highway applications, pavement materials must withstand high-frequency dynamic loads. Traditional epoxy resins, due to their brittleness and high rigidity, are prone to failure under fatigue loads. While existing technologies have attempted to introduce toughening methods such as rubber crumb and SBS modification, these modifications have had limited success in improving dynamic fatigue performance and have not been ideal for improving the compatibility of epoxy resin with asphalt.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an epoxy resin material for epoxy asphalt, which solves the problems of poor compatibility, insufficient flexibility and poor dynamic fatigue performance existing in traditional epoxy asphalt materials through multi-component collaborative design and optimized preparation process.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] An epoxy resin material for epoxy asphalt, comprising component A and component B mixed in a mass ratio of 100:50-90, wherein the epoxy equivalent in component A and the amine equivalent in component B are 1-1.1:1;

[0008] In parts by mass, component A includes:

[0009] Bisphenol A epoxy resin: 50-60 parts;

[0010] Modified epoxy resin: 30 to 40 parts;

[0011] Active diluent: 10 to 15 parts;

[0012] 1 to 3 parts of interface compatibilizer;

[0013] In terms of parts by mass, component B includes:

[0014] Alicyclic amine curing agent: 50 to 60 parts;

[0015] Polyamide curing agent: 30 to 40 parts;

[0016] Dynamic ionic crosslinker: 3 to 5 parts;

[0017] Imidazole catalyst: 1 to 2 parts.

[0018] Preferably, the bisphenol A epoxy resin has an epoxy value of one or more of E51 and E44. E51 and E44 are liquid bisphenol A epoxy resins with moderate viscosity and good fluidity, maintaining good uniformity when mixed with other components. E51 has an epoxy equivalent weight of 190-210 g / eq, a high epoxy group content, strong reactivity, and a more rigid material after curing. E44 has an epoxy equivalent weight of 210-250 g / eq, a moderate epoxy group content, low reactivity, and slightly higher material flexibility. By adjusting the ratio of E51 and E44, a balance between strength, flexibility, adhesion, and low-temperature performance can be optimized.

[0019] Preferably, the modified epoxy resin is produced by reacting glycidyl ether with polyether polyol or long-chain aliphatic polyol. Polyether polyol or long-chain aliphatic polyol molecules contain long-chain flexible segments. Their introduction significantly reduces the crosslink density of the cured epoxy resin, enhancing the material's flexibility, improving its elongation at break and impact resistance, and preventing brittle cracking under dynamic loads or low temperatures, meeting the requirements of bridge pavement and dynamic fatigue environments.

[0020] Preferably, the modified epoxy resin is prepared by reacting glycidyl ether and polyether polyol, comprising the following steps:

[0021] A11 polyether polyol is vacuum dehydrated at 50-60°C to ensure that the moisture content is less than 0.1% to avoid fluctuations in material properties caused by moisture impurities;

[0022] A12 Add polyether polyol into the reactor in proportion, heat to 50-60℃, slowly add glycidyl ether and stir evenly; avoid excessive ring opening of epoxy groups under high temperature conditions, and improve the conversion rate of the reaction.

[0023] A13 When the temperature of the mixture stabilizes at 60-80°C, add the catalyst and continue stirring, maintaining the reaction temperature at 80-100°C for 4-6 hours.

[0024] After the reaction of A14 is completed, the solvent and volatile by-products are removed under reduced pressure, and then the mixture is cooled to room temperature and filtered to remove impurities to obtain a modified epoxy resin.

[0025] Preferably, the glycidyl ether is one or more of methyl glycidyl ether and ethoxy glycidyl ether;

[0026] Preferably, the polyether polyol is one or more of polypropylene glycol and polytetramethylene glycol; the flexible ether bond (-O-) contained in its molecular structure has a high degree of rotational freedom, which can significantly reduce the Tg of the modified epoxy resin, and because of its polar properties, it has good compatibility with epoxy groups and polar groups in asphalt.

[0027] Preferably, the molar ratio of glycidyl ether to polyether polyol is 1.2:1.

[0028] Preferably, the catalyst is a tertiary amine or a quaternary ammonium salt.

[0029] Under the action of the catalyst, the hydroxyl groups in the polyether polyol undergo a ring-opening reaction with the epoxy groups in the glycidyl ether. The hydroxyl groups act as nucleophiles and combine with the carbon atoms in the epoxy groups to generate new ether bonds and hydroxyl groups, which significantly improves the polarity of the epoxy resin, increases the interaction with the polar groups of asphalt, and enhances the interfacial bonding strength between the epoxy resin and asphalt, solving the problem of poor compatibility between traditional epoxy resins and asphalt and easy separation of the interface.

[0030] As another preferred embodiment, the modified epoxy resin is prepared by reacting glycidyl ether with a long-chain aliphatic polyol:

[0031] A21 long-chain aliphatic polyol is vacuum dehydrated at 70-80°C to ensure that there is no free water;

[0032] A22: Add long-chain aliphatic polyol to the reactor, heat to 50-70°C, slowly add glycidyl ether, and stir evenly;

[0033] A23 then adds the catalyst and stirs evenly, raising the temperature to 80-120°C, maintaining the reaction temperature at 100-120°C, and the reaction time is 6-8 hours;

[0034] After the reaction of A24 is completed, unreacted glycidyl ether and volatile by-products are removed by distillation under reduced pressure, the mixture is cooled to room temperature, and insoluble matter is removed by filtration to obtain a modified epoxy resin.

[0035] Under the action of catalysts (such as tertiary amines, quaternary ammonium salts), the hydroxyl groups of long-chain aliphatic polyols act as nucleophiles and undergo nucleophilic addition reactions with the epoxy groups of glycidyl ethers. During this process, the epoxy group opens to form a new ether bond and generates a hydroxyl group, thereby increasing the molecular chain segments.

[0036] Preferably, the glycidyl ether is one or more of methyl glycidyl ether and ethoxy glycidyl ether;

[0037] The long-chain aliphatic polyol is one or more of 1,6-hexanediol and polyethylene adipate. 1,6-hexanediol or polyethylene adipate have long, flexible aliphatic chains that significantly reduce the crosslink density of the epoxy resin after curing, imparting exceptional flexibility to the material. Furthermore, the long-chain aliphatic chains have an extremely low Tg, significantly lowering the Tg of the modified epoxy resin and maintaining excellent flexibility even at low temperatures.

[0038] The molar ratio of glycidyl ether to long-chain aliphatic polyol is 1.1:1.

[0039] Preferably, the reactive diluent is one or more of glycidyl methacrylate, n-butyl glycidyl ether, ethoxy glycidyl ether, phenyl glycidyl ether, and glycidyl ether ester. The epoxy groups in the reactive diluent can participate in the curing reaction of the epoxy resin and cross-link with the curing agent to form a three-dimensional network structure. Compared with inactive diluents (such as benzyl alcohol), the reactive diluent can participate in the curing reaction with the epoxy resin without significantly reducing the crosslink density.

[0040] Among them, glycidyl methacrylate is used to enhance the rigidity and chemical stability of the material and improve its durability under high dynamic fatigue environment. n-Butyl glycidyl ether and ethoxy glycidyl ether reduce the glass transition temperature (Tg) of the material by introducing flexible chain segments, thereby improving low-temperature toughness and crack resistance. Phenyl glycidyl ether can enhance heat resistance and interfacial bonding. Glycidyl ether ester provides both flexibility and certain strength, and is suitable for scenarios with high requirements for dynamic fatigue performance.

[0041] Preferably, the interfacial compatibilizer is one or more of a maleic anhydride grafted styrene-butadiene block copolymer and a silane coupling agent. The maleic anhydride group (-COCH=CHCO-) in SBS-g-MAH can react chemically with the polar groups in the epoxy resin to form a chemical bond, thereby improving the bonding strength between the epoxy resin and the compatibilizer. The styrene (PS) segment in SBS has good compatibility with the epoxy resin, while the butadiene (PB) segment is compatible with the non-polar components of asphalt. Its block structure forms a "bridge" at the interface between the epoxy resin and the asphalt, significantly improving the interfacial bonding strength between the two phases. The silane coupling agent molecule contains reactive groups (such as amino and epoxy groups) and siloxane groups (-SiOR) at both ends. The siloxane groups can combine with the polar groups (such as carboxyl and hydroxyl groups) in the asphalt through a condensation reaction, while the reactive groups cross-link with the epoxy resin to form a strong interfacial bond. The introduction of the interfacial compatibilizer significantly enhances the compatibility between the epoxy resin and the asphalt, improves the interfacial bonding strength, and reduces interfacial defects.

[0042] Preferably, the alicyclic amine curing agent is one or more of isophorone diamine, 4,4-diaminodicyclohexylmethane, or 1,3-cyclohexanediamine. The alicyclic structure in the molecule gives the cured epoxy resin a high crosslink density and rigidity. Among them, isophorone diamine and 4,4-diaminodicyclohexylmethane have high thermal stability, and the glass transition temperature (Tg) of the cured material is high. 4,4-diaminodicyclohexylmethane (PACM) provides excellent thermal stability due to its symmetrical alicyclic structure. 1,3-cyclohexanediamine combines high flexibility and low-temperature resistance, making it suitable for scenarios with high dynamic performance requirements.

[0043] Preferably, the polyamide curing agent is a long-chain aliphatic polyamide, which contains long-chain aliphatic segments (C6 to C12) and uniformly distributed amide groups, specifically one or more of polyhexamethylene adipamide, polydecanediamine adipate, and polyamide elastomer (PEBA). Compared with aromatic or short-chain polyamides, long-chain aliphatic polyamides provide higher molecular segment flexibility, which significantly improves the elongation at break of the material and exhibits excellent impact resistance. Under dynamic load conditions, the material is not prone to breakage and is suitable for bridge pavements and dynamic engineering applications that require higher toughness.

[0044] As a preferred embodiment, the dynamic ion crosslinking agent is one or more of zinc acetate, calcium acetate, and magnesium acetate. The dynamic ion crosslinking agent is a divalent metal ion (Zn 2+ , Ca 2+ or Mg 2+ ) undergoes reversible ionic coordination with polar groups (such as carboxyl or hydroxyl) in epoxy resin, compatibilizer or other components. This crosslinking can dissociate under dynamic load or external force, thereby absorbing energy and dispersing stress.

[0045] In the present invention, acetate has good chemical stability, is not easy to decompose or produce side reactions, can stably exist in epoxy resin systems and asphalt, and avoid interference with system performance. The coordination bond between acetate and divalent metal ions is a medium-strength ionic bond, which can not only provide the stability required for dynamic cross-linking, but also quickly break and recombine under the action of external forces, thereby showing excellent dynamic adaptability. On this basis, acetate has better biocompatibility and environmental protection performance than anions such as nitrate and chloride ions, and has less potential harm to the environment. In particular, acetate does not release oxidizing or corrosive by-products, and is more suitable for application in long-term exposure environments such as bridge pavement and tunnel waterproofing.

[0046] The second purpose of the present invention is to provide a method for using epoxy resin material for epoxy asphalt, which has the same technical effect.

[0047] In order to achieve the above object, the technical solution adopted by the present invention is:

[0048] A method for using an epoxy resin material for epoxy asphalt, comprising the following steps:

[0049] S1: Weigh each component according to the mass ratio and set aside;

[0050] S2: Add bisphenol A epoxy resin to a reaction kettle under stirring conditions, heat to 50-60°C to reduce the viscosity, then slowly add modified epoxy resin and stir evenly, then add reactive diluent and interfacial compatibilizer in sequence, continue stirring until the system is uniform and transparent, and cool to room temperature to obtain component A;

[0051] Bisphenol A epoxy resin provides highly reactive epoxy groups (-CH2-O-CH-) as the core reaction site of the curing reaction. The flexible chain segments and polar groups introduced into the modified epoxy resin can effectively reduce the crosslinking density of the epoxy resin, improve its flexibility and low-temperature performance, and enhance its compatibility with asphalt. The epoxy groups in the active diluent participate in the curing reaction together with the bisphenol A epoxy resin, which not only reduces the viscosity but also improves the crosslinking density and chemical stability of the cured material. The interfacial compatibilizer enhances the interfacial bonding between the epoxy resin and asphalt through chemical or physical interactions and reduces interfacial defects.

[0052] S3: At room temperature, the alicyclic amine curing agent and the polyamide curing agent are added to a stirred tank in proportion and mixed evenly, a dynamic ionic crosslinking agent is added and dispersed evenly under stirring, an imidazole catalyst is added, and stirring is continued to obtain component B;

[0053] The alicyclic structure in the alicyclic amine curing agent provides high reactivity and thermal stability, allowing it to react quickly with epoxy groups to form a high-strength three-dimensional network. The long-chain aliphatic segments in the polyamide curing agent reduce the crosslink density, enhancing the flexibility and low-temperature adaptability of the curing system. The two work synergistically to balance the material's strength and flexibility. Zinc acetate, calcium acetate, or magnesium acetate form a dynamic ionic crosslinking network with polar groups (such as hydroxyl and amide groups) in the curing system. The reversible nature of the dynamic crosslinking network allows the crosslinks to break and reform under stress or heat, enhancing the material's dynamic fatigue performance.

[0054] S4: mixing component A obtained in step S2 and component B obtained in step S3 according to a mass ratio, and stirring evenly to obtain an epoxy resin material for epoxy asphalt;

[0055] S5: The epoxy resin material for epoxy asphalt that has been stirred and mixed evenly is mixed with asphalt (70# road petroleum asphalt) preheated to 170°C in a mass ratio of 1:1 to form a hot-mix epoxy asphalt binder.

[0056] The beneficial effects of the present invention are:

[0057] In the present invention, by scientifically designing the combination ratio of component A and component B, and accurately matching the epoxy equivalent and the amine equivalent, an epoxy resin with significantly improved mechanical properties, durability, flexibility and low-temperature adaptability is prepared. Among them, the bisphenol A type epoxy resin provides high strength and high rigidity, ensuring the stability of the material under high temperature and high load environments. The modified epoxy resin provides flexible chain segments, effectively improving the flexibility and low-temperature crack resistance of the material, and preventing the material from cracking under dynamic load or low-temperature environment. The dynamic ion crosslinking agent (Zn 2+ , Ca 2+ Mg 2+ ) introduced a dynamic reversible cross-linking network, which greatly improved the material's fatigue resistance and met the needs of high dynamic load scenarios such as bridge paving. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0060]

[0061]

[0062] Example 1

[0063] An epoxy resin material for epoxy asphalt, comprising component A and component B mixed in a mass ratio of 100:90,

[0064] Component A comprises, by weight, 55 parts of E51, 35 parts of modified epoxy resin, 10 parts of glycidyl methacrylate, and 2 parts of SBS-g-MAH. The modified epoxy resin is prepared by reacting methyl glycidyl ether with polytetramethylene glycol.

[0065] Calculated by weight, component B includes: 55 parts of isophorone diamine; 35 parts of polydecanediamine adipate; 4 parts of zinc acetate; and 1 part of imidazole catalyst.

[0066] A method for preparing an epoxy resin material for epoxy asphalt, comprising the following steps:

[0067] S1: Weigh each component according to the mass ratio and set aside;

[0068] S2: Add bisphenol A epoxy resin to a reactor under stirring conditions, heat to 60°C to reduce the viscosity, then slowly add modified epoxy resin and stir evenly, then add reactive diluent and interfacial compatibilizer in sequence, continue stirring until the system is uniform and transparent, and cool to room temperature to obtain component A;

[0069] S3: At room temperature, the alicyclic amine curing agent and the polyamide curing agent are added to a stirred tank in proportion and mixed evenly, a dynamic ionic crosslinking agent is added and dispersed evenly under stirring, an imidazole catalyst is added, and stirring is continued to obtain component B;

[0070] S4: mixing component A obtained in step S2 and component B obtained in step S3 according to a mass ratio, and stirring evenly to obtain an epoxy resin material for epoxy asphalt;

[0071] S5: The epoxy resin material for epoxy asphalt that has been stirred and mixed evenly is mixed with 70# road petroleum asphalt that has been preheated to 170°C in a mass ratio of 1:1 to form a hot-mix epoxy asphalt binder.

[0072] Example 2

[0073] An epoxy resin material for epoxy asphalt, comprising component A and component B mixed in a mass ratio of 100:80,

[0074] Calculated by weight, component A includes: E44: 50 parts; modified epoxy resin: 30-40 parts; n-butyl glycidyl ether: 10 parts; KH-550: 2 parts; the modified epoxy resin is prepared by reacting ethoxy glycidyl ether with 1,6-hexanediol.

[0075] Calculated by weight, component B includes: 60 parts of 4,4-diaminodicyclohexylmethane; 30 parts of polyhexamethylene adipamide; 3.5 parts of calcium acetate; and 1.5 parts of imidazole catalyst.

[0076] A method for preparing an epoxy resin material for epoxy asphalt, comprising the following steps:

[0077] S1: Weigh each component according to the mass ratio and set aside;

[0078] S2: Add bisphenol A epoxy resin to a reactor under stirring conditions, heat to 55°C to reduce the viscosity, then slowly add modified epoxy resin and stir evenly, then add reactive diluent and interfacial compatibilizer in sequence, continue stirring until the system is uniform and transparent, and cool to room temperature to obtain component A;

[0079] S3: At room temperature, the alicyclic amine curing agent and the polyamide curing agent are added to a stirred tank in proportion and mixed evenly, a dynamic ionic crosslinking agent is added and dispersed evenly under stirring, an imidazole catalyst is added, and stirring is continued to obtain component B;

[0080] S4: mixing component A obtained in step S2 and component B obtained in step S3 according to a mass ratio, and stirring evenly to obtain an epoxy resin material for epoxy asphalt;

[0081] S5: The epoxy resin material for epoxy asphalt that has been stirred and mixed evenly is mixed with 70# road petroleum asphalt that has been preheated to 170°C in a mass ratio of 1:1 to form a hot-mix epoxy asphalt binder.

[0082] Example 3

[0083] An epoxy resin material for epoxy asphalt, comprising component A and component B mixed in a mass ratio of 100:70,

[0084] Calculated by weight, component A includes: E51: 55 parts; modified epoxy resin: 38 parts; ethoxy glycidyl ether: 12 parts; KH-570: 1 part; the modified epoxy resin is prepared by reacting ethoxy glycidyl ether with polypropylene glycol.

[0085] Calculated by weight, component B includes: 50 parts of 1,3-cyclohexanediamine; 40 parts of polyhexamethylene adipamide; 4 parts of magnesium acetate; and 1 part of imidazole catalyst.

[0086] A method for preparing an epoxy resin material for epoxy asphalt, comprising the following steps:

[0087] S1: Weigh each component according to the mass ratio and set aside;

[0088] S2: Add bisphenol A epoxy resin to a reactor under stirring conditions, heat to 50°C to reduce the viscosity, then slowly add modified epoxy resin and stir evenly, then add reactive diluent and interfacial compatibilizer in sequence, continue stirring until the system is uniform and transparent, and cool to room temperature to obtain component A;

[0089] S3: At room temperature, the alicyclic amine curing agent and the polyamide curing agent are added to a stirred tank in proportion and mixed evenly, a dynamic ionic crosslinking agent is added and dispersed evenly under stirring, an imidazole catalyst is added, and stirring is continued to obtain component B;

[0090] S4: mixing component A obtained in step S2 and component B obtained in step S3 according to a mass ratio, and stirring evenly to obtain an epoxy resin material for epoxy asphalt;

[0091] S5: The epoxy resin material for epoxy asphalt that has been stirred and mixed evenly is mixed with 70# road petroleum asphalt that has been preheated to 170°C in a mass ratio of 1:1 to form a hot-mix epoxy asphalt binder.

[0092] Comparative Example 1

[0093] An epoxy resin material for epoxy asphalt, comprising component A and component B mixed in a mass ratio of 100:90,

[0094] Component A includes, by weight: E51: 60 parts; glycidyl ether epoxy resin: 35 parts; glycidyl methacrylate: 10 parts; SBS-g-MAH: 2 parts;

[0095] Calculated by weight, component B includes: 55 parts of isophorone diamine; 35 parts of polydecanediamine adipate; 4 parts of zinc acetate; and 1 part of imidazole catalyst.

[0096] A method for preparing an epoxy resin material for epoxy asphalt, comprising the following steps:

[0097] S1: Weigh each component according to the mass ratio and set aside;

[0098] S2: Add bisphenol A epoxy resin to a reaction kettle under stirring conditions, heat to 60°C to reduce the viscosity, then slowly add glycidyl ether epoxy resin and stir evenly, then add reactive diluent and interfacial compatibilizer in sequence, continue stirring until the system is uniform and transparent, and cool to room temperature to obtain component A;

[0099] S3: At room temperature, the alicyclic amine curing agent and the polyamide curing agent are added to a stirred tank in proportion and mixed evenly, a dynamic ionic crosslinking agent is added and dispersed evenly under stirring, an imidazole catalyst is added, and stirring is continued to obtain component B;

[0100] S4: mixing component A obtained in step S2 and component B obtained in step S3 according to a mass ratio, and stirring evenly to obtain an epoxy resin material for epoxy asphalt;

[0101] S5: The epoxy resin material for epoxy asphalt that has been stirred and mixed evenly is mixed with 70# road petroleum asphalt that has been preheated to 170°C in a mass ratio of 1:1 to form a hot-mix epoxy asphalt binder.

[0102] Comparative Example 2

[0103] An epoxy resin material for epoxy asphalt, comprising component A and component B mixed in a mass ratio of 100:90,

[0104] Component A includes, by weight: E51: 60 parts; glycidyl ether epoxy resin: 35 parts; glycidyl methacrylate: 10 parts; SBS-g-MAH: 2 parts;

[0105] Calculated by weight, component B includes: 55 parts of isophorone diamine; 35 parts of polydecanediamine adipate; and 1 part of imidazole catalyst.

[0106] A method for preparing an epoxy resin material for epoxy asphalt, comprising the following steps:

[0107] S1: Weigh each component according to the mass ratio and set aside;

[0108] S2: Add bisphenol A epoxy resin to a reaction kettle under stirring conditions, heat to 60°C to reduce the viscosity, then slowly add glycidyl ether epoxy resin and stir evenly, then add reactive diluent and interfacial compatibilizer in sequence, continue stirring until the system is uniform and transparent, and cool to room temperature to obtain component A;

[0109] S3: At room temperature, the alicyclic amine curing agent and the polyamide curing agent are added to a stirring kettle in proportion, mixed evenly, and an imidazole catalyst is added and stirred evenly to obtain component B;

[0110] S4: mixing component A obtained in step S2 and component B obtained in step S3 according to a mass ratio, and stirring evenly to obtain an epoxy resin material for epoxy asphalt;

[0111] S5: The epoxy resin material for epoxy asphalt that has been stirred and mixed evenly is mixed with 70# road petroleum asphalt that has been preheated to 170°C in a mass ratio of 1:1 to form a hot-mix epoxy asphalt binder.

[0112] Performance Testing

[0113] 1. The workability time of hot mix epoxy asphalt binder is determined according to EN 10364-2018, and the tensile strength and elongation at break of hot mix epoxy asphalt binder are determined according to ASTM D638-2008.

[0114] 2. A hot-mix epoxy asphalt binder and basalt aggregate were mixed according to SMA grading and an asphalt-to-aggregate ratio of 7 wt% to form a hot-mix epoxy asphalt mixture. Marshall stability testing was conducted according to ASTM D6927-2015; rutting testing was conducted according to EN 12697-22; freeze-thaw splitting testing was conducted according to ASTM D6931-2017; and bending testing was conducted according to EN 12697-26-2018. Finally, a four-point bending fatigue life test of the hot-mix epoxy asphalt mixture was conducted according to ASTM D4760-2010.

[0115] The test results are shown in the following table:

[0116]

[0117]

[0118] In the present invention, the modified epoxy resin has flexible segments, which can reduce the crosslinking density of the epoxy resin, improve flexibility and toughness, and effectively disperse stress and alleviate stress concentration. As shown above, compared with Example 1, Comparative Example 1, which does not use modified epoxy resin, results in higher rigidity of the cured material, significantly reduced elongation at break, and significant stress concentration, resulting in significantly reduced fatigue life and low-temperature crack resistance.

[0119] On this basis, compared with Comparative Example 1, Comparative Example 2 does not add a dynamic ionic crosslinker. The dynamic ionic crosslinker can break and reorganize under dynamic load by forming reversible ionic bonds, effectively dispersing stress and alleviating stress concentration. After curing, the material of Comparative Example 2 lacks dynamic adjustment ability, the dynamic fatigue life is further reduced, and the brittleness in low temperature environment is significantly increased, and obvious cracking occurs.

[0120] Therefore, Example 1 achieves better comprehensive performance by combining modified epoxy resin and dynamic ion crosslinking agent, especially in terms of elongation at break, four-point bending fatigue life and interface bonding strength, which is significantly better than the two comparative examples.

[0121] Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An epoxy resin material for epoxy asphalt, characterized in that: The invention comprises a component A and a component B mixed in a mass ratio of 100:50-90, wherein the epoxy equivalent in the component A and the amine equivalent in the component B are 1-1.1:1; In parts by mass, the component A comprises: Bisphenol A epoxy resin: 50-60 parts; Modified epoxy resin: 30~40 parts; Active diluent: 10 to 15 parts; 1 to 3 parts of interface compatibilizer; In parts by mass, the B component includes: Alicyclic amine curing agent: 50~60 parts; Polyamide curing agent: 30~40 parts; Dynamic ionic crosslinker: 3 to 5 parts; Imidazole catalyst: 1 to 2 parts.

2. The epoxy resin material for epoxy asphalt according to claim 1, characterized in that: The modified epoxy resin is prepared by reacting glycidyl ether with polyether polyol or long-chain aliphatic polyol.

3. The epoxy resin material for epoxy asphalt according to claim 1, characterized in that: The active diluent is one or more of glycidyl methacrylate, n-butyl glycidyl ether, ethoxy glycidyl ether, phenyl glycidyl ether, and glycidyl ether ester.

4. The epoxy resin material for epoxy asphalt according to claim 1, characterized in that: The interfacial compatibilizer is one or more of a maleic anhydride grafted styrene-butadiene block copolymer and a silane coupling agent.

5. The epoxy resin material for epoxy asphalt according to claim 1, characterized in that: The alicyclic amine curing agent is one or more of isophorone diamine, 4,4-diaminodicyclohexylmethane or 1,3-cyclohexanediamine.

6. The epoxy resin material for epoxy asphalt according to claim 1, characterized in that: The polyamide curing agent is a long-chain aliphatic polyamide.

7. The epoxy resin material for epoxy asphalt according to claim 1, characterized in that: The dynamic ionic crosslinking agent is one or more of zinc acetate, calcium acetate, and magnesium acetate.

8. The method for using the epoxy resin material for epoxy asphalt according to claim 1, characterized in that: The steps are as follows: S1: Weigh each component according to the mass ratio and set aside; S2: Add bisphenol A epoxy resin to a reactor under stirring conditions, heat to 50-60°C to reduce the viscosity, then slowly add modified epoxy resin and stir evenly, then add reactive diluent and interfacial compatibilizer in sequence, continue stirring until the system is uniform and transparent, and cool to room temperature to obtain component A; S3: At room temperature, the alicyclic amine curing agent and the polyamide curing agent are added to a stirred tank in proportion and mixed evenly, a dynamic ionic crosslinking agent is added and dispersed evenly under stirring, an imidazole catalyst is added, and stirring is continued to obtain component B; S4: Component A obtained in step S2 and component B obtained in step S3 are mixed according to a mass ratio, and stirred evenly to obtain an epoxy resin material for epoxy asphalt; S5: The epoxy resin material for epoxy asphalt that has been stirred and mixed evenly is stirred and mixed evenly with asphalt preheated to 170° C. in a mass ratio of 1:1 to form a hot-mix epoxy asphalt binder.

9. The method for using the epoxy resin material for epoxy asphalt according to claim 8, characterized in that: The modified epoxy resin is prepared by reacting glycidyl ether and polyether polyol, and comprises the following steps: A11 polyether polyol is vacuum dehydrated at 50-60°C to ensure that the moisture content is less than 0.1%; A12 Add polyether polyol into the reactor in proportion, heat to 50-60°C, slowly add glycidyl ether, and stir evenly; A13 When the mixture temperature stabilizes at 60-80°C, add the catalyst and continue stirring, maintaining the reaction temperature at 80-100°C for 4-6 hours; After the reaction of A14 is completed, the solvent and volatile by-products are removed under reduced pressure, and then the mixture is cooled to room temperature and filtered to remove impurities to obtain a modified epoxy resin.

10. The method for using the epoxy resin material for epoxy asphalt according to claim 8, characterized in that: The modified epoxy resin is prepared by reacting glycidyl ether and long-chain aliphatic polyol: A21 long-chain aliphatic polyol is vacuum dehydrated at 70-80°C to ensure there is no free water; A22: Add long-chain aliphatic polyol to the reactor, heat to 50-70°C, slowly add glycidyl ether, and stir evenly; A23 then adds the catalyst and stirs evenly, raising the temperature to 80-120°C and maintaining the reaction temperature at 100-120°C for 6-8 hours; After the reaction of A24 is completed, unreacted glycidyl ether and volatile by-products are removed by distillation under reduced pressure, the mixture is cooled to room temperature, and insoluble matter is removed by filtration to obtain a modified epoxy resin.

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