Anti-rutting epoxy asphalt modifier and use method thereof

Abstract

The invention relates to the technical field of bridge and tunnel paving materials, in particular to an anti-rutting epoxy asphalt modifier and a using method thereof.The anti-rutting epoxy asphalt modifier is prepared from, by mass, 13-27 parts of a component A and 12.1-27 parts of a component B; the component A comprises the following components in parts by mass: 10-20 parts of epoxy resin; 2-4 parts of a reactive diluent; 1-3 parts of a composite bifunctional compatilizer; the component B comprises the following components in parts by mass: 10-20 parts of a curing agent; 2-4 parts of an accelerant; 0.1-3 parts of a functionalized carbon nanomaterial; a carbon nanomaterial is subjected to amino silane functional modification, so that the adaptability among epoxy, asphalt and aggregate is improved, the carbon nanomaterial and the asphalt are premixed to form an asphalt-carbon nanoskeleton structure, and the compatibility between the epoxy and the asphalt is improved by utilizing a composite bifunctional compatilizer; finally, the epoxy, the asphalt and the aggregate are tightly bonded through physical blending and chemical bonding, so that the anti-rutting performance is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge and tunnel paving materials, and in particular to an anti-rutting epoxy asphalt modifier and a use method thereof. Background Art

[0002] In recent years, with rapid economic development and a dramatic increase in transportation volume, existing roads are facing the challenges of increasing traffic volumes and heavy vehicle loads. Rutting has become a critical issue affecting road lifespan and driving safety. Existing anti-rutting agents are mostly polymer modifiers, which can improve asphalt properties to a certain extent. Currently, they primarily enhance high-temperature stability by raising the softening point. However, due to environmental factors, their performance gradually declines, resulting in poor long-term anti-rutting effectiveness.

[0003] As a thermosetting material with excellent performance, epoxy resin can greatly improve the rutting resistance of asphalt. When the epoxy content is high, a two-phase structure with a thermosetting epoxy network as the continuous phase can be formed in the asphalt system, which can greatly improve the rutting resistance. Conversely, the improvement of the rutting resistance of the asphalt system is limited. In addition, epoxy asphalt mixtures are mainly composed of three components: epoxy, asphalt, and aggregate. Epoxy and asphalt have poor compatibility, while epoxy asphalt has good compatibility with acidic aggregates. However, in actual engineering, the type of aggregate is often limited by the environment and region, making it difficult to ensure the compatibility of the three-component system of epoxy asphalt mixtures. Therefore, considering the balance between cost and performance, it is urgent to solve the compatibility problem between low-dosage epoxy, asphalt, and aggregates to achieve improved rutting resistance.

[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 first purpose of the present invention is to provide an anti-rutting epoxy asphalt modifier, which improves the compatibility between epoxy, asphalt and aggregate by functionalizing carbon nanomaterials with aminosilane, premixing the carbon nanomaterials with asphalt to form an asphalt-carbon nano skeleton structure, and utilizing a composite bifunctional compatibilizer to enhance the compatibility between epoxy and asphalt. Finally, the epoxy, asphalt and aggregate are physically blended and chemically bonded to form a tight bond, thereby achieving a substantial improvement in anti-rutting performance.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] An anti-rutting epoxy asphalt modifier comprising, by weight, 13 to 27 parts of component A and 12.1 to 27 parts of component B;

[0008] Component A is calculated by mass and includes:

[0009] 10-20 parts of epoxy resin;

[0010] 2 to 4 parts of reactive diluent;

[0011] 1~3 composite bifunctional compatibilizer;

[0012] Component B is calculated by mass and includes:

[0013] 10-20 parts of curing agent;

[0014] 2-4 parts of accelerator;

[0015] 0.1 to 3 parts of functionalized carbon nanomaterials.

[0016] The anti-rutting epoxy asphalt modifier of the present invention comprises a functionalized carbon nanomaterial that has been functionalized with an aminosilane compound. When used, the functionalized carbon nanomaterial is first mixed with the matrix asphalt. The amino groups can participate in the epoxy curing reaction, and the silane groups can form chemical bonds with the surface active groups of the aggregate. Furthermore, the carbon nanomaterial with a high specific surface area has excellent affinity with asphalt and can adsorb and fill the asphalt to form a physical skeleton structure. This not only provides rigid support for the asphalt, but also enhances the interfacial bonding between the asphalt, the epoxy resin, and the aggregate through chemical grafting, thus compensating for the lack of physical support in low-dosage epoxy systems.

[0017] The composite bifunctional compatibilizer contains epoxy groups and maleic anhydride groups. The epoxy groups can copolymerize with epoxy resins, while the maleic anhydride groups react with the hydroxyl and carboxyl groups in asphalt to form a strong bond across the epoxy-asphalt phase, significantly improving the poor compatibility between the two phases.

[0018] The physical skeleton support of functionalized carbon nanomaterials and the chemical interface bridging of composite bifunctional compatibilizers form a synergistic effect. The former restricts the flow of asphalt through the carbon nanonetwork, and the latter enhances the compatibility of the multiphase system through chemical bonding. Ultimately, under low epoxy dosage conditions, the synergistic improvement of the compatibility among epoxy, asphalt and aggregate is achieved, effectively solving the problems of long-term performance degradation of traditional anti-rutting agents and poor compatibility of epoxy asphalt with aggregates, while taking into account the balance between cost and anti-rutting performance.

[0019] As a preferred embodiment of the present invention, the functionalized carbon nanomaterial is prepared by functionalizing a carbon nanomaterial with an aminosilane compound;

[0020] The carbon nanomaterial is one or more of graphene, graphyne, carbon nanotubes, and fullerene. More specifically, the carbon nanomaterial and asphalt have similar elemental compositions, are highly compatible, and have a hollow skeleton structure with a high specific surface area. The asphalt can be fully filled into the skeleton structure of the carbon nanomaterial to form an asphalt-carbon nanostructure, thereby increasing the strength of the asphalt and improving its rutting resistance.

[0021] The aminosilane compound is one or more of aminopropyltriethoxysilane, aminopropyldimethoxymethylsilane and aminopropyltrimethoxysilane.

[0022] Preferably, the preparation method of the functionalized carbon nanomaterial comprises: dispersing 3-8 parts of carbon nanomaterial in 8-12 parts of ethanol, adding 0.5-2 parts of aminosilane compound, heating under reflux at 50-65° C. for 2-3 hours, separating and drying the product to obtain the functionalized carbon nanomaterial.

[0023] More specifically, in the above preparation process, the aminosilane compound is first hydrolyzed in an ethanol solvent to generate an active intermediate containing silanol groups. The intermediate forms a covalent bond with the active groups (such as hydroxyl groups) on the surface of the carbon nanomaterial through a condensation reaction, thereby grafting the aminosilane to the surface of the carbon nanomaterial, so that the carbon nanomaterial has both amino groups that can participate in the epoxy curing reaction and silane groups that can chemically bond with the active groups on the aggregate surface.

[0024] As a preferred embodiment of the present invention, the composite bifunctional compatibilizer is an epoxy maleic anhydride prepolymer;

[0025] Epoxy maleic anhydride prepolymer is prepared by free radical polymerization of ethylene oxide and maleic anhydride;

[0026] Preferably, the preparation method of the epoxy maleic anhydride prepolymer comprises: dissolving 4-8 parts of ethylene oxide and 4-9 parts of maleic anhydride in xylene, adding 0.1-0.7 parts of benzoyl peroxide, and reacting at 55-65° C. for 1-4 hours to obtain a composite bifunctional compatibilizer.

[0027] More specifically, in the above preparation method, benzoyl peroxide is used as a free radical initiator. Under the condition of 55-65°C, it decomposes to produce free radicals, which trigger a free radical copolymerization reaction between the epoxy groups in ethylene oxide and the anhydride groups in maleic anhydride, so that the two are connected by chemical bonds to form an epoxymaleic anhydride prepolymer. The prepolymer molecular chain retains both the epoxy groups and the maleic anhydride groups, wherein the epoxy groups can participate in the epoxy curing reaction, and the maleic anhydride groups can bond with the hydroxyl and carboxyl groups in asphalt, thereby achieving the dual function of improving the compatibility of epoxy and asphalt.

[0028] The molecular weight of the epoxy maleic anhydride prepolymer is 5,000 to 10,000.

[0029] More specifically, if the molecular weight of the epoxy maleic anhydride prepolymer is too low, the short molecular chain and insufficient functional group density will weaken its cross-linking effect with the epoxy system and its bonding effect with asphalt, resulting in insufficient interfacial bridging effect, making it difficult to effectively improve the compatibility and bonding strength between epoxy and asphalt; if the molecular weight is too high, the molecular chain will be too long and the steric hindrance will increase, resulting in a decrease in the fluidity of the system, making it difficult to disperse evenly in the epoxy and asphalt, and may even cause a surge in the viscosity of the system and construction difficulties. In addition, overly entangled molecular chains will weaken the chemical reaction efficiency with epoxy and asphalt. The molecular weight within the above range enables the prepolymer to have both appropriate molecular chain length and functional group density, which can not only fully participate in the epoxy curing reaction through the epoxy groups on the molecular chain to form a cross-linked network with the epoxy resin, but also effectively bond with the hydroxyl and carboxyl groups in the asphalt through the maleic anhydride groups to form a strong chemical connection layer at the interface between epoxy and asphalt.

[0030] As a preferred embodiment of the present invention, the epoxy resin is one or more of E44 and E51.

[0031] More specifically, E44 and E51 epoxy resins, which are rich in epoxy groups in their molecular structure, can undergo copolymerization reaction with the epoxy groups of the composite bifunctional compatibilizer to construct a stable epoxy cross-linking network, thereby improving structural stability and achieving improved anti-rutting performance.

[0032] As a preferred embodiment of the present invention, the reactive diluent is one or more of 1,4-butanediol diglycidyl ether, resorcinol diglycidyl ether, and poly(dimethylsiloxane) diglycidyl ether.

[0033] More specifically, the above-mentioned reactive diluent molecules contain active epoxy groups, which can reduce the viscosity of the epoxy resin system and improve the mixing and paving process during construction. At the same time, they can participate in the curing reaction through the epoxy groups, avoiding the pore defects left after the traditional non-reactive diluent evaporates. It has a similar chemical structure to epoxy resin and excellent compatibility, and the introduced flexible chain segments (such as polysiloxane groups) can adjust the rigidity and flexibility balance of the epoxy network, and synergistically improve the deformation resistance and toughness of epoxy asphalt under load.

[0034] As a preferred embodiment of the present invention, the curing agent is one or more of acid anhydride, dicyandiamide and polyetheramine.

[0035] More specifically, the above-mentioned curing agents are all high-temperature curing agents. Since component B and the matrix asphalt need to be premixed at high temperature, the curing agent is not easy to volatilize and lose under high temperature conditions, and can be stably present in the asphalt system, ensuring that it can fully participate in the curing reaction when subsequently mixed with the epoxy resin to form a high-temperature resistant cross-linked network structure, thereby effectively improving the high-temperature stability and anti-rutting performance of epoxy asphalt; at the same time, it avoids the imbalance of system components and the decrease in bonding strength caused by the volatilization of the curing agent, and ensures the integrity and effectiveness of the chemical cross-linking network under low-dosage epoxy conditions.

[0036] As a preferred embodiment of the present invention, the accelerator is one or more of tertiary amine, imidazole, resorcinol and aminophenol.

[0037] More specifically, the above-mentioned accelerator can significantly accelerate the cross-linking rate of the curing agent and epoxy resin by reducing the activation energy of the epoxy curing reaction, shorten the curing time during construction, and improve engineering efficiency; in a low-dosage epoxy system, the accelerator can accurately adjust the curing reaction process, avoiding the problem of slow curing caused by low epoxy content, while ensuring that the amino groups of the functionalized carbon nanomaterial and the epoxy groups of the composite bifunctional compatibilizer fully react with the epoxy system.

[0038] A second object of the present invention is to provide a method for using the anti-rutting epoxy asphalt modifier, comprising:

[0039] S1: uniformly mixing epoxy resin, reactive diluent and composite bifunctional compatibilizer to obtain component A;

[0040] S2: mixing the functionalized carbon nanomaterial, the curing agent and the accelerator to obtain component B;

[0041] S3: mixing and dispersing the B component and the matrix asphalt to obtain a carbon nano-skeleton modified asphalt material;

[0042] S4 adds component A to the carbon nano-skeleton modified asphalt material and mixes them evenly to obtain anti-rutting epoxy asphalt.

[0043] More specifically, the specific steps of the method of use are:

[0044] S1: preheat the epoxy resin, reactive diluent, and composite bifunctional compatibilizer to 60°C, add them into a reactor in proportion, and stir at 300 rpm for 2 hours to obtain component A;

[0045] S2: adding functionalized carbon nanomaterials, curing agent, and accelerator into the reactor in proportion, stirring at 300 r / min for 2 h to obtain component B;

[0046] S3: Add component B and matrix asphalt into the reactor in proportion, stir at 300 r / min for 2 h, and obtain carbon nano-skeleton modified asphalt material;

[0047] S4 adds component A to the carbon nano-skeleton modified asphalt material and mixes them evenly to obtain anti-rutting epoxy asphalt.

[0048] When the anti-rutting epoxy asphalt modifier of the present invention is used, components A and B are first prepared, component B is then made to form a carbon nano-skeleton structure with asphalt, and finally component A is introduced for cross-linking to ensure that the functionalized carbon nano-material and asphalt fully form a physical support network. Then, a composite bifunctional compatibilizer is used to achieve chemical bonding between the epoxy and asphalt, synergistically enhancing the compatibility and structural stability of the system in steps. The operation is simple and convenient and is conducive to engineering applications.

[0049] As a preferred embodiment of the present invention, the mass ratio of component A: component B: matrix asphalt is 5-10: 5-10: 80-90.

[0050] More specifically, the total dosage of modifiers (A+B components) accounts for 10% to 20%, which not only ensures the minimum dosage requirement of functionalized carbon nanomaterials to form an asphalt-carbon nanoskeleton structure and composite bifunctional compatibilizers to achieve chemical cross-linking of epoxy and asphalt, but also avoids the cost increase caused by excessive dosage; the mass ratio of component A to component B is close to 1:1, which can balance the synergistic effect of physical skeleton support and chemical interface enhancement, and prevent the excessive amount of a certain component from causing compatibility imbalance; the matrix asphalt accounts for 80% to 90% to ensure that it maintains the stability of the system as a continuous phase, and at the same time, the anti-rutting performance is improved through the precise dosage of modifiers, taking into account both material performance and engineering economy.

[0051] As a preferred embodiment of the present invention, the mixing temperature of component B and base asphalt is 100-120°C.

[0052] Preferably, the matrix asphalt is 70# matrix asphalt.

[0053] More specifically, this temperature range can not only keep the matrix asphalt in good fluidity, facilitate the uniform dispersion of functionalized carbon nanomaterials and their full contact with asphalt to form a stable asphalt carbon nanoskeleton structure, but also avoid excessively high temperatures leading to oxidation and aging of the asphalt or volatilization and loss of the curing agent; at the same time, under conditions of 100-120°C, the physical adsorption and chemical reactions between the asphalt and the surface groups of the functionalized carbon nanomaterials can be activated, thereby enhancing the stability of the skeleton structure and laying the foundation for the synergistic effect of the physical skeleton and chemical cross-linking when subsequently mixed with component A, thereby ensuring the effective improvement of the anti-rutting performance.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] 1) The present invention pre-mixes functionalized carbon nanomaterials with matrix asphalt to form a carbon nano-skeleton modified asphalt, which provides a physical skeleton structure while improving the compatibility between epoxy resin and asphalt. By pre-mixing a composite bifunctional compatibilizer with epoxy resin, a bifunctional modified epoxy resin is formed, achieving a synergistic improvement in the compatibility among epoxy, asphalt and aggregate, thereby significantly improving the anti-rutting performance of the epoxy asphalt mixture.

[0056] 2) The functionalized carbon nanomaterial of the present invention is prepared by functionalizing carbon nanomaterial with aminosilane compounds. The elemental composition of carbon nanomaterial and asphalt is similar, the two have good compatibility, and the carbon nanomaterial has a high specific surface area. The asphalt can be fully filled in the carbon nanomaterial to form an asphalt carbon nanoskeleton structure, thereby improving the strength of the asphalt; in addition, the functionalized carbon nanomaterial contains amino and silane groups, which can form chemical bonds with the epoxy system, thereby improving the compatibility of asphalt and the epoxy system, and the asphalt carbon nanophysical skeleton structure can effectively supplement the low-dosage epoxy resin network to form a physical skeleton-chemical network synergistic reinforcement system, further improving the anti-rutting performance of epoxy asphalt.

[0057] 3) The composite bifunctional compatibilizer of the present invention is an epoxy maleic anhydride prepolymer, which contains both epoxy groups and anhydride groups, which can chemically react with the epoxy system and asphalt, respectively, thereby effectively improving the compatibility of the epoxy system and asphalt; in addition, the composite bifunctional compatibilizer is a high molecular weight polymer, and the chemical connection structure formed between the epoxy system and asphalt has a certain mechanical strength, which can effectively enhance the anti-rutting performance of epoxy asphalt.

[0058] 4) The functionalized carbon nanomaterials of the present invention contain amino and silane groups, which can chemically react with the active groups on the surface of acidic aggregates. The composite bifunctional compatibilizer contains epoxy groups and anhydride groups, which can chemically react with acidic aggregates and alkaline aggregates respectively, thereby improving the compatibility between the epoxy asphalt system and different types of stone, fundamentally solving the compatibility problem between epoxy asphalt and aggregates. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 Schematic diagram of the synergistic effect of functionalized carbon nanomaterials and composite bifunctional compatibilizers;

[0060] Figure 2 This is the microstructure diagram of the anti-rutting epoxy asphalt in Example 2;

[0061] Figure 3 This is the microstructure diagram of the anti-rutting epoxy asphalt in Comparative Example 3;

[0062] Reference numerals: 1. asphalt; 2. epoxy; 3. functionalized carbon nanomaterial; 4. composite bifunctional compatibilizer;

[0063] Figure 2 and Figure 3 In the figure, at the same magnification, the light-colored areas are epoxy and the dark-colored areas are the matrix asphalt. DETAILED DESCRIPTION

[0064] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0065] Sources of raw materials used in the examples and comparative examples:

[0066] Epoxy resin: E51, Shanghai MacLean Biochemical Technology Co., Ltd.

[0067] Reactive diluent: 1,4-butanediol diglycidyl ether, Shanghai Aladdin Biochemical Technology Co., Ltd.

[0068] Composite bifunctional compatibilizer: ethylene oxide, maleic anhydride, benzoyl peroxide, Shanghai Aladdin Biochemical Technology Co., Ltd.

[0069] Curing agent: dicyandiamide, Shanghai Aladdin Biochemical Technology Co., Ltd.

[0070] Accelerator: 2,4,6-tris(dimethylaminomethyl)phenol, Sinopharm Chemical Reagent Co., Ltd.

[0071] Carbon nanomaterials: carbon nanotube powder, Jiangsu Chaocarbon Xianfeng Technology Co., Ltd.

[0072] Ethanol: Shanghai Aladdin Biochemical Technology Co., Ltd.

[0073] Aminosilane compound: aminopropyltriethoxysilane, Shanghai Aladdin Biochemical Technology Co., Ltd.

[0074] The preparation method of the composite bifunctional compatibilizer in the examples and comparative examples is:

[0075] Dissolve 5 parts of ethylene oxide and 5 parts of maleic anhydride in xylene, add 0.2 parts of benzoyl peroxide, and react at 60°C for 2 hours to obtain a composite bifunctional compatibilizer.

[0076] The preparation method of the functionalized carbon nanomaterial in the examples and comparative examples is as follows:

[0077] Disperse 5 parts of carbon nanotubes in 10 parts of ethanol, add 1 part of aminopropyltriethoxysilane, heat under reflux at 60° C. for 2 to 3 hours, separate and dry the product, and obtain functionalized carbon nanomaterials.

[0078] The test method for the performance of the mixture in the embodiments and comparative examples is as follows:

[0079] Refer to "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011):

[0080] The anti-rutting factor G* / sinδ is tested according to T0628-2011 "Asphalt Rheological Properties Test";

[0081] The Marshall stability of asphalt mixtures is tested according to T0709-2011 "Marshall Stability Test of Asphalt Mixtures";

[0082] The dynamic stability is tested according to T0719-2011 "Asphalt Mixture Rutting Test";

[0083] The low temperature crack resistance is tested according to T0715-2011 "Asphalt Mixture Bending Test";

[0084] The adhesion and toughness of epoxy asphalt and aggregate were tested according to T0624-2011 "Asphalt Adhesion and Toughness Test";

[0085] The adhesion between epoxy asphalt and aggregate is tested according to T0616-1993 "Test for adhesion between asphalt and coarse aggregate".

[0086] Example 1:

[0087] The anti-rutting epoxy asphalt modifier provided in this embodiment is calculated by weight as follows: the anti-rutting epoxy asphalt component A includes 10 parts of epoxy resin, 2 parts of reactive diluent, and 3 parts of composite bifunctional compatibilizer; the anti-rutting epoxy asphalt component B includes 10 parts of curing agent, 2 parts of accelerator, and 1.5 parts of functionalized carbon nanomaterial;

[0088] The preparation and use process of an anti-rutting epoxy asphalt modifier is as follows:

[0089] S1: Preheat 10 parts of epoxy resin, 2 parts of reactive diluent, and 1 part of composite bifunctional compatibilizer to 60°C, add them into a reactor in proportion, and stir at 300 rpm for 2 hours to obtain component A;

[0090] S2: 10 parts of curing agent, 2 parts of accelerator, and 0.5 parts of functionalized carbon nanomaterial are added to the reactor and stirred at 300 r / min for 2 h to obtain component B;

[0091] S3: Add 10 parts of component B and 80 parts of base asphalt into a reactor, stir at 300 rpm for 2 hours at 100-120°C to obtain a carbon nano-skeleton modified asphalt material;

[0092] S4: Add 10 parts of component A to the carbon nano-skeleton modified asphalt material and mix them evenly to obtain anti-rutting epoxy asphalt.

[0093] Performance testing:

[0094] Table 1. Test results of anti-rutting epoxy asphalt and mixture performance in Example 1

[0095]

[0096] Example 2:

[0097] The anti-rutting epoxy asphalt modifier provided in this embodiment is calculated by weight as follows: the anti-rutting epoxy asphalt component A includes 10 parts of epoxy resin, 2 parts of reactive diluent, and 2 parts of composite bifunctional compatibilizer; the anti-rutting epoxy asphalt component B includes 10 parts of curing agent, 2 parts of accelerator, and 1 part of functionalized carbon nanomaterial;

[0098] The preparation and use process of an anti-rutting epoxy asphalt modifier is as follows:

[0099] S1: Preheat 10 parts of epoxy resin, 2 parts of reactive diluent, and 2 parts of composite bifunctional compatibilizer to 60°C, add them into a reactor in proportion, and stir at 300 rpm for 2 hours to obtain component A;

[0100] S2: 10 parts of curing agent, 2 parts of accelerator, and 1 part of functionalized carbon nanomaterial were added to the reactor and stirred at 300 r / min for 2 h to obtain component B;

[0101] S3: Add 10 parts of component B and 80 parts of base asphalt into a reactor, stir at 300 rpm for 2 hours at 100-120°C to obtain a carbon nano-skeleton modified asphalt material;

[0102] S4: Add 10 parts of component A to the carbon nano-skeleton modified asphalt material and mix them evenly to obtain anti-rutting epoxy asphalt.

[0103] Performance testing:

[0104] Table 2. Test results of anti-rutting epoxy asphalt and mixture performance in Example 2

[0105]

[0106] Example 3:

[0107] The anti-rutting epoxy asphalt modifier provided in this embodiment is calculated by weight as follows: the anti-rutting epoxy asphalt component A includes 10 parts of epoxy resin, 2 parts of reactive diluent, and 1 part of composite bifunctional compatibilizer; the anti-rutting epoxy asphalt component B includes 10 parts of curing agent, 2 parts of accelerator, and 0.5 parts of functionalized carbon nanomaterial;

[0108] The preparation and use process of an anti-rutting epoxy asphalt modifier is as follows:

[0109] S1: Preheat 10 parts of epoxy resin, 2 parts of reactive diluent, and 3 parts of composite bifunctional compatibilizer to 60°C, add them into a reactor in proportion, and stir at 300 rpm for 2 hours to obtain component A;

[0110] S2: 10 parts of curing agent, 2 parts of accelerator, and 1.5 parts of functionalized carbon nanomaterial are added to the reactor and stirred at 300 r / min for 2 h to obtain component B;

[0111] S3: Add 10 parts of component B and 80 parts of base asphalt into a reactor, stir at 300 rpm for 2 hours at 100-120°C to obtain a carbon nano-skeleton modified asphalt material;

[0112] S4: Add 10 parts of component A to the carbon nano-skeleton modified asphalt material and mix them evenly to obtain anti-rutting epoxy asphalt.

[0113] Performance testing:

[0114] Table 3. Test results of anti-rutting epoxy asphalt and mixture performance of Example 3

[0115]

[0116] Figure 1 This is a schematic diagram of the synergistic effect of functionalized carbon nanomaterials and composite bifunctional compatibilizers, showing that the functionalized carbon nanomaterials and asphalt form an asphalt-carbon nanoskeleton structure to provide physical support. The amino and silane groups on its surface are chemically bonded to the epoxy system and aggregate, respectively. At the same time, the composite bifunctional compatibilizer copolymerizes with the epoxy resin through the epoxy group and bonds with the polar groups of the asphalt through the maleic anhydride group, forming a chemical connection layer between the epoxy and the asphalt. The two improve the compatibility and bonding strength among the epoxy, asphalt and aggregate through the synergistic effect of physical skeleton support and chemical interface enhancement, thereby enhancing the anti-rutting performance of the epoxy asphalt.

[0117] Comparative Example 1:

[0118] The anti-rutting epoxy asphalt modifier provided in this comparative example is calculated by weight as follows: the anti-rutting epoxy asphalt component A includes 10 parts of epoxy resin, 2 parts of reactive diluent, and 2 parts of composite bifunctional compatibilizer; the anti-rutting epoxy asphalt component B includes 10 parts of curing agent and 2 parts of accelerator.

[0119] In this comparative example, the preparation and use methods are the same as those in Example 2, except that no functionalized carbon nanomaterial is added.

[0120] Performance testing:

[0121] Table 4. Comparative Example 1 Anti-rutting Epoxy Asphalt and Mixture Performance Test Results

[0122]

[0123] Compared with Example 2, Comparative Example 1 did not incorporate functionalized carbon nanomaterials. As shown in Table 4, the anti-rutting factor G* / sinδ decreased from 24.12 kPa to 11.01 kPa, and the microscopic distribution uniformity of the epoxy asphalt deteriorated. The Marshall stability decreased from 22.34 kN to 11.24 kN, the dynamic stability decreased from 14,113 times / mm to 6,954 times / mm, and the maximum flexural strain decreased from 2,436 to 1,243. The toughness of the epoxy asphalt to aggregate decreased from 21.44 N·m to 10.96 N·m, and the adhesion to aggregate decreased from the highest level of 5 to level 2. These data indicate that functionalized carbon nanomaterials can provide a skeletal support in epoxy asphalt and mixtures, effectively improving anti-rutting performance, mixture strength, and low-temperature crack resistance. Furthermore, they improve the compatibility of epoxy and asphalt to a certain extent, enhancing the adhesion between epoxy asphalt and aggregate.

[0124] Comparative Example 2:

[0125] The anti-rutting epoxy asphalt modifier provided in this comparative example is calculated by weight: the anti-rutting epoxy asphalt component A includes 10 parts of epoxy resin, 2 parts of reactive diluent, and 2 parts of composite bifunctional compatibilizer; the anti-rutting epoxy asphalt component B includes 10 parts of curing agent, 2 parts of accelerator, and 1 part of carbon nanomaterial;

[0126] In this comparative example, the preparation and use methods are the same as those in Example 2, except that the carbon nanomaterial is not subjected to amino-silanization modification.

[0127] Performance testing:

[0128] Table 5. Comparative Example 2 Anti-rutting Epoxy Asphalt and Mixture Performance Test Results

[0129]

[0130] Compared with Example 2, Comparative Example 2 did not perform aminosilanization modification on the carbon nanomaterial. As shown in Table 5, the anti-rutting factor G* / sinδ decreased from 24.12 kPa to 13.27 kPa, and the microscopic distribution uniformity of the epoxy asphalt deteriorated. The Marshall stability decreased from 22.34 kN to 13.54 kN, the dynamic stability decreased from 14113 times / mm to 7842 times / mm, and the maximum flexural strain decreased from 2436 to 1466. The toughness of the epoxy asphalt to aggregate decreased from 21.44 N·m to 12.78 N·m, and the adhesion to aggregate decreased from the highest level of 5 to level 2. These data indicate that aminosilanization modification of the carbon nanomaterial can increase the compatibility between the epoxy asphalt and aggregate, forming chemical bonds between the epoxy, asphalt, and aggregate, thereby improving the mixture's strength, low-temperature crack resistance, and anti-rutting properties.

[0131] Comparative Example 3:

[0132] The anti-rutting epoxy asphalt modifier provided in this comparative example is calculated by weight: the anti-rutting epoxy asphalt component A includes 10 parts of epoxy resin, 2 parts of reactive diluent, and 2 parts of sodium dodecylbenzene sulfonate; the anti-rutting epoxy asphalt component B includes 10 parts of curing agent, 2 parts of accelerator, and 1 part of functionalized carbon nanomaterial;

[0133] In this comparative example, the preparation and use methods are the same as those in Example 2, except that the composite bifunctional compatibilizer is replaced by the common epoxy asphalt compatibilizer sodium dodecylbenzene sulfonate.

[0134] Performance testing:

[0135] Table 6. Comparative Example 3 Anti-rutting Epoxy Asphalt and Mixture Performance Test Results

[0136]

[0137] Compared with Example 2, Comparative Example 3 replaced the composite bifunctional compatibilizer with sodium dodecylbenzene sulfonate, a common epoxy asphalt compatibilizer. As shown in Table 6, the anti-rutting factor G* / sinδ decreased from 24.12 kPa to 12.11 kPa, and the microscopic distribution uniformity of the epoxy asphalt deteriorated. The Marshall stability decreased by 12.32 kN from 22.34 kN, the dynamic stability decreased from 14113 times / mm to 7367 times / mm, and the maximum flexural strain decreased from 2436 to 1398. The epoxy asphalt-aggregate adhesion toughness decreased from 21.44 N·m to 11.34 N·m, and the aggregate adhesion decreased from level 5 to level 3. It can be seen from the data results that the composite bifunctional compatibilizer can improve the compatibility of epoxy and asphalt while enhancing the bonding strength between epoxy and asphalt, and through synergistic action with functionalized carbon nanomaterials, it can improve the compatibility among epoxy, asphalt and aggregate, thereby achieving a significant improvement in the mixture strength, low-temperature crack resistance and rutting resistance.

[0138] Figure 2 The epoxy asphalt in Example 2 has good uniformity of microstructural distribution. The reason is that: functionalized carbon nanomaterials are pre-mixed with asphalt to form an asphalt-carbon nanoskeleton structure to provide physical support. At the same time, the composite bifunctional compatibilizer copolymerizes with the epoxy resin through epoxy groups and bonds with the asphalt through maleic anhydride groups, forming a strong chemical connection layer at the interface between epoxy and asphalt. The synergistic effect of the two achieves uniform dispersion and tight bonding of epoxy and asphalt.

[0139] Figure 3 The epoxy asphalt in Comparative Example 3 has extremely poor microstructural distribution uniformity. The reason is that the composite bifunctional compatibilizer is replaced with the ordinary compatibilizer sodium dodecylbenzene sulfonate, which cannot simultaneously undergo bonding reactions with epoxy and asphalt through chemical groups and lacks chemical interface bridging effect, resulting in poor compatibility between epoxy and asphalt, obvious separation of the two phases, and a significant decrease in structural uniformity.

[0140] Comparative Example 4:

[0141] The ratio of the anti-rutting epoxy asphalt modifier provided in this comparative example is exactly the same as that in Example 2.

[0142] In this comparative example, except that the functionalized carbon nanomaterial and the asphalt are not premixed, the rest of the preparation and use methods are the same as those in Example 2.

[0143] Performance testing:

[0144] Table 7. Comparative Example 4 Anti-rutting Epoxy Asphalt and Mixture Performance Test Results

[0145]

[0146] Compared with Example 2, Comparative Example 4 did not premix the functionalized carbon nanomaterials with the asphalt. As shown in Table 7, the anti-rutting factor G* / sinδ decreased from 24.12 kPa to 14.56 kPa, and the microscopic distribution uniformity of the epoxy asphalt deteriorated; the Marshall stability decreased from 22.34 kN to 15.66 kN, the dynamic stability decreased from 14113 times / mm to 8934 times / mm, and the maximum flexural strain decreased from 2436 to 1574; the toughness of the epoxy asphalt to aggregate decreased from 21.44 N·m to 13.46 N·m, and the adhesion to the aggregate decreased from the highest level of 5 to level 3. The data results show that premixing the functionalized carbon nanomaterials with asphalt for 2 hours can greatly enhance the synergistic effect between the asphalt and the functionalized carbon nanomaterials, forming an effective asphalt-carbon nanostructured structure, improving the compatibility between the asphalt, epoxy, and aggregate, and significantly improving the mixture strength, low-temperature crack resistance, and anti-rutting performance.

[0147] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An anti-rutting epoxy asphalt modifier, characterized in that: Calculated by weight, it includes 13 to 27 parts of component A and 12.1 to 27 parts of component B; The A component is calculated by weight and includes: 10-20 parts of epoxy resin; 2~4 parts of reactive diluent; 1~3 composite bifunctional compatibilizer; The B component is calculated by mass and includes: 10~20 parts of curing agent; 2~4 parts of accelerator; 0.1~3 parts of functionalized carbon nanomaterials.

2. The anti-rutting epoxy asphalt modifier according to claim 1, characterized in that The functionalized carbon nanomaterial is prepared by functionalizing carbon nanomaterial with an aminosilane compound; The carbon nanomaterial is one or more of graphene, graphyne, carbon nanotube and fullerene; The aminosilane compound is one or more of aminopropyltriethoxysilane, aminopropyldimethoxymethylsilane and aminopropyltrimethoxysilane.

3. The anti-rutting epoxy asphalt modifier according to claim 1, wherein The composite bifunctional compatibilizer is an epoxy maleic anhydride prepolymer; The epoxy maleic anhydride prepolymer is prepared by free radical polymerization of ethylene oxide and maleic anhydride; The molecular weight of the epoxy maleic anhydride prepolymer is 5000-10000.

4. The anti-rutting epoxy asphalt modifier according to claim 1, characterized in that The epoxy resin is one or more of E44 and E51.

5. The anti-rutting epoxy asphalt modifier according to claim 1, characterized in that: The reactive diluent is one or more of 1,4-butanediol diglycidyl ether, resorcinol diglycidyl ether and poly(dimethylsiloxane) diglycidyl ether.

6. The anti-rutting epoxy asphalt modifier according to claim 1, characterized in that: The curing agent is one or more of acid anhydride, dicyandiamide and polyetheramine.

7. The anti-rutting epoxy asphalt modifier according to claim 1, characterized in that: The accelerator is one or more of tertiary amine, imidazole, resorcinol and aminophenol.

8. The method for using the anti-rutting epoxy asphalt modifier according to any one of claims 1 to 7, wherein: include: The epoxy resin, the reactive diluent and the composite bifunctional compatibilizer are uniformly mixed to obtain component A; The functionalized carbon nanomaterial, the curing agent and the accelerator are uniformly mixed to obtain component B; The B component and the matrix asphalt are mixed and dispersed uniformly to obtain a carbon nano-skeleton modified asphalt material; Component A is added to the carbon nano-skeleton modified asphalt material and mixed evenly to obtain anti-rutting epoxy asphalt.

9. The method for using the anti-rutting epoxy asphalt modifier according to claim 8, wherein: The mass ratio of component A: component B: matrix asphalt is 5~10:5~10:80~90.

10. The method for using the anti-rutting epoxy asphalt modifier according to claim 8, wherein: The mixing temperature of the B component and the matrix asphalt is 100-120°C.

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