Epoxy grafted composite modified asphalt

Abstract

The invention relates to epoxy grafted composite modified asphalt, and relates to the technical field of asphalt, the epoxy grafted composite modified asphalt comprises the following components by mass: 90-94 parts of modified asphalt, and 6-10 parts of an epoxy resin component; the epoxy resin component comprises epoxy resin and a compatibilization curing agent. According to the present invention, the compatibility between the epoxy resin and the asphalt is improved so as to improve the strength, the hardness and the wear resistance of the asphalt, such that the asphalt can well bear the vehicle load, the heat resistance and the weather resistance of the asphalt are enhanced, the problems of high-temperature deformation, low-temperature cracking and the like are reduced, and the service life of the road and other related projects is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of asphalt, and in particular to an epoxy-grafted composite modified asphalt. Background Art

[0002] In the field of road engineering, modified asphalt is widely used in infrastructure such as high-grade highways, bridges, and airport runways due to its excellent performance. Traditional modified asphalt mainly improves its high-temperature stability, low-temperature crack resistance, and durability by adding polymers (such as SBS) or rubber powder. However, with the continuous increase in traffic load and the increasingly harsh environmental conditions, traditional modified asphalt still shows certain limitations under some extreme conditions (such as high temperature, low temperature, or heavy traffic), such as insufficient high-temperature stability, poor low-temperature crack resistance, and difficulty in meeting the requirements of long-term durability.

[0003] In order to further improve the comprehensive performance of modified asphalt, researchers have begun to explore introducing epoxy resin into the asphalt modification system in recent years. Epoxy resin is considered an ideal modifier due to its high bonding strength, excellent mechanical properties, and chemical stability. By grafting epoxy resin with asphalt, a stable three-dimensional network structure can be formed, thus significantly improving the mechanical properties and durability of asphalt. However, the compatibility problem between epoxy resin and asphalt has become the main technical bottleneck restricting its wide application. Due to the significant differences in chemical structure and polarity between epoxy resin and asphalt, phase separation easily occurs during the mixing process, resulting in a decrease in the uniformity and stability of the modified asphalt, and further affecting its mechanical properties and construction performance, so it needs to be improved. Summary of the Invention

[0004] In order to improve the stability of epoxy-grafted composite modified asphalt, this application provides an epoxy-grafted composite modified asphalt.

[0005] An epoxy-grafted composite modified asphalt provided by this application adopts the following technical solution: An epoxy-grafted composite modified asphalt, comprising the following components in parts by mass: Modified asphalt 90 - 94 parts Epoxy resin component 6 - 10 parts; The epoxy resin component includes epoxy resin and compatibilizing curing agent.

[0006] The modified asphalt provides good base adhesiveness and flexibility, and can adapt to the deformation requirements of road and other usage scenarios; the epoxy resin in the epoxy resin component has high activity and cross-linking ability, and the compatibilizing curing agent promotes the cross-linking reaction of the epoxy resin to form a three-dimensional network structure, enhancing the compatibility between the epoxy resin and the modified asphalt; during the combination of the two, the epoxy grafting reaction forms a chemical bond connection between the epoxy resin and the modified asphalt, greatly enhancing the compatibility and bonding force of the two, not only improving the strength, hardness and wear resistance of the asphalt, enabling it to better withstand vehicle loads, but also enhancing its heat resistance and weather resistance, reducing problems such as high-temperature deformation and low-temperature cracking, and extending the service life of roads and other related projects.

[0007] Preferably, the preparation raw materials of the modified asphalt include SBS, rubber powder and matrix asphalt.

[0008] SBS has good elasticity and thermal stability, can improve the high and low temperature performance of asphalt, forms a continuous phase in the asphalt, enhances the flexibility and deformation resistance of the asphalt, prevents the asphalt from flowing at high temperatures, and reduces cracking at low temperatures; the rubber powder is rich in rubber components, can swell with the asphalt, can improve the viscosity and toughness of the asphalt, and enhance the fatigue resistance; SBS and the rubber powder act together on the matrix asphalt, and the three are fully mixed and reacted, so that the modified asphalt has better adhesiveness and flexibility while having more excellent high and low temperature stability and durability, thus laying a foundation for subsequent grafting and compounding with the epoxy resin component, further improving the comprehensive performance of the epoxy grafted composite modified asphalt, and meeting the complex and changeable road use conditions.

[0009] Preferably, the preparation raw materials of the modified asphalt further include sodium dimethyldithiocarbamate and coumarone resin.

[0010] Sodium dimethyldithiocarbamate can react with the active groups in the rubber powder, the polar part of its molecular structure can interact with the polar groups in the epoxy resin, and the non-polar part is affinity with the asphalt molecules, thus playing a bridging role between the two, promoting mutual dispersion and fusion, improving the dispersion and stability of the rubber powder in the asphalt, and enhancing the adhesion between the asphalt and the aggregate; coumarone resin has good tackifying and plasticizing effects, reduces the interfacial tension between the epoxy resin and the modified asphalt, makes the epoxy resin more easily dispersed and uniform in the asphalt, and increases the compatibility between the epoxy resin and the asphalt; at the same time, coumarone resin increases the viscosity of the modified asphalt, improves its bonding strength with other materials, and improves the flexibility and processing performance of the asphalt.

[0011] Preferably, the epoxy resin is modified to obtain a modified epoxy resin, and the preparation raw materials of the modified epoxy resin include an epoxy resin body and a modifier.

[0012] The modifier can improve the compatibility between epoxy resin and modified asphalt. Its molecule contains reactive groups that can chemically react with the epoxy resin body, introducing new structural units into the epoxy resin molecular chain. Part of the newly introduced structural units has a polarity similar to that of epoxy resin and can closely combine with epoxy resin, while the other part has groups similar to the asphalt molecular structure and can intertwine and dissolve with asphalt molecules. Through bridging action, the interfacial tension between the two is reduced, enabling the epoxy resin to be evenly dispersed in the asphalt system, enhancing their compatibility, so that each component can be fully mixed and synergistically play a role, making the composite modified asphalt have the advantages of high strength and high adhesiveness of epoxy resin as well as the flexibility and waterproofness of asphalt, improving the comprehensive performance of pavement materials and extending the service life of roads.

[0013] Preferably, the preparation raw materials of the modifier include linolenic acid, N-(n-butyl)-3-aminopropyltrimethoxysilane, and vanillin.

[0014] Linolenic acid is an unsaturated fatty acid, and its long carbon chain structure is similar to the hydrocarbon components in asphalt. It can interact with asphalt molecules through van der Waals forces between molecules, enhancing the affinity between the modifier and asphalt. The silane part in N-(n-butyl)-3-aminopropyltrimethoxysilane can be hydrolyzed to form silanol, which then undergoes a condensation reaction with the hydroxyl groups in epoxy resin to form a strong chemical bond, while the aminopropyl group can react with the carboxyl group of linolenic acid to connect the two. Vanillin contains an aldehyde group and a phenolic hydroxyl group. The aldehyde group can react with amino groups to further expand the molecular structure, and the phenolic hydroxyl group can participate in the whole system through weak interactions such as hydrogen bonds to regulate the intermolecular forces. The modifier formed by the reaction of the three has one end tightly combined with asphalt by virtue of the carbon chain of linolenic acid and the other end connected to epoxy resin through silane, building a stable molecular bridge between epoxy resin and asphalt, enabling the modifier to penetrate into the molecular level of the two materials, effectively reducing the interfacial tension between them, promoting the dispersion and fusion of epoxy resin in asphalt, significantly enhancing the compatibility between epoxy resin and asphalt, and enhancing the comprehensive performance and durability of pavement materials.

[0015] Preferably, the modifier is prepared by the following steps: Mix and disperse linolenic acid, N-(n-butyl)-3-aminopropyltrimethoxysilane, and vanillin in toluene, heat and stir, then raise the temperature for reaction. After cooling, rotary evaporate to remove the solvent to obtain the modifier.

[0016] The modifier prepared according to the above steps can effectively improve the compatibility between epoxy resin and modified asphalt.

[0017] Preferably, the compatibilizing curing agent includes polyamide curing agent and dicyandiamide.

[0018] The polyamide curing agent molecule contains a long-chain structure and polar groups. The long-chain part has a certain similarity with asphalt molecules and can entangle with asphalt molecules through van der Waals forces to achieve a preliminary affinity effect. Its polar groups can undergo a ring-opening reaction with the epoxy groups in the epoxy resin to form a chemical bond connection, thereby enhancing the compatibility between the epoxy resin and the modified asphalt. Dicyandiamide plays a role in promoting crosslinking and reacts with the epoxy resin under high-temperature conditions to increase the crosslinking density of the epoxy resin, making the structure of the epoxy resin more stable. This stable structure, in cooperation with the polyamide curing agent, enables the epoxy resin to have a more stable interface when compounded with asphalt, reducing the occurrence of phase separation phenomena, allowing the epoxy resin to be uniformly and stably dispersed in the asphalt system, enhancing the compatibility between the epoxy resin and the asphalt, and improving the service life and stability of road materials.

[0019] Preferably, the raw materials for preparing the polyamide curing agent include tall oil fatty acid dimer acid and diethylenetriamine.

[0020] The molecular structure of tall oil fatty acid dimer acid has the characteristics of long-chain fatty acids and contains two carboxyl groups. The long-chain part is similar to the hydrocarbon structure in asphalt and can attract and entangle with asphalt molecules through van der Waals forces, enhancing the affinity with asphalt. Its carboxyl groups have high reactivity and can undergo a polycondensation reaction with the amino groups in diethylenetriamine to form a polyamide structure. Diethylenetriamine contains multiple active amino groups, which can not only react with tall oil fatty acid dimer acid to form the polyamide main chain but also undergo a ring-opening addition reaction with the epoxy groups in the epoxy resin subsequently. The polyamide curing agent can play a bridging role, connecting with asphalt through the long-chain fatty acid structure at one end and tightly binding with the epoxy resin through amino groups at the other end, effectively reducing the interfacial tension between the epoxy resin and asphalt, enabling the epoxy resin to be uniformly dispersed in asphalt, enhancing the compatibility between the two, and enhancing the adhesion, flexibility, and durability of asphalt.

[0021] Preferably, the mass ratio of the tall oil fatty acid dimer acid to diethylenetriamine is (2.5 - 3.5):1.

[0022] The polyamide curing agent prepared according to the above mass ratio has good reactivity, can effectively enhance the compatibility between the epoxy resin and the modified asphalt, and thus improve the road performance of the epoxy grafted composite modified asphalt.

[0023] Preferably, the epoxy grafted composite modified asphalt is prepared by the following steps: Stir and heat up the base asphalt, add SBS, increase the rotation speed and stir to obtain a preliminary mixture; add the rubber powder to the preliminary mixture, stir, heat up and react to obtain the modified asphalt; add the epoxy resin component to the modified asphalt, heat and stir to react, and discharge after cooling to obtain the epoxy grafted composite modified asphalt.

[0024] The epoxy-grafted composite modified asphalt prepared according to the above steps has good compatibility and stability, has good adhesion, flexibility and durability, can withstand vehicle loads, and has excellent high and low temperature performance.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The modified asphalt provides good basic adhesion and flexibility, and can adapt to the deformation requirements of road and other usage scenarios; the epoxy resin in the epoxy resin component has high activity and cross-linking ability, and the compatibilizing curing agent promotes the cross-linking reaction of the epoxy resin to form a three-dimensional network structure, improving the compatibility between the epoxy resin and the modified asphalt; during the combination of the two, the epoxy grafting reaction forms a chemical bond connection between the epoxy resin and the modified asphalt, greatly enhancing the compatibility and bonding force of the two, not only improving the strength, hardness and wear resistance of the asphalt, enabling it to better withstand vehicle loads, but also enhancing its heat resistance and weather resistance, reducing problems such as high temperature deformation and low temperature cracking, and extending the service life of related projects such as roads.

[0026] 2. Linolenic acid is an unsaturated fatty acid, and its long carbon chain structure is similar to the hydrocarbon components in asphalt, and can interact with asphalt molecules through van der Waals forces between molecules, enhancing the affinity between the modifier and asphalt; the silane part in N-(n-butyl)-3-aminopropyltrimethoxysilane can be hydrolyzed to generate silanol, which then undergoes a condensation reaction with the hydroxyl group in the epoxy resin to form a strong chemical bond, while the aminopropyl group can react with the carboxyl group of linolenic acid to connect the two; vanillin contains an aldehyde group and a phenolic hydroxyl group, the aldehyde group can react with the amino group to further expand the molecular structure, and the phenolic hydroxyl group can participate in the whole system through weak interactions such as hydrogen bonds to regulate the intermolecular forces; the modifier generated by the reaction of the three, one end is tightly combined with asphalt by virtue of the carbon chain of linolenic acid, and the other end is connected to the epoxy resin through silane, building a stable molecular bridge between the epoxy resin and asphalt, enabling the modifier to penetrate into the molecular level of the two materials, effectively reducing the interfacial tension between the two, promoting the dispersion and fusion of the epoxy resin in asphalt, significantly improving the compatibility between the epoxy resin and asphalt, and enhancing the comprehensive performance and durability of pavement materials.

[0027] 3. The molecular structure of tall oil fatty acid dimeric acid has the characteristics of long-chain fatty acids and contains two carboxyl groups. The long-chain part is similar to the hydrocarbon structure in asphalt. By virtue of van der Waals forces, it can attract and entangle with asphalt molecules, enhancing its affinity with asphalt. Its carboxyl group has high reactivity and can undergo a polycondensation reaction with the amino group in diethylenetriamine to form a polyamide structure. Diethylenetriamine contains multiple active amino groups. It can not only react with tall oil fatty acid dimeric acid to form the main chain of the polyamide, but also undergo a ring-opening addition reaction with the epoxy group in epoxy resin subsequently. The polyamide curing agent can play a bridging role, connecting with asphalt through the long-chain fatty acid structure at one end and tightly binding with epoxy resin through the amino group at the other end, effectively reducing the interfacial tension between epoxy resin and asphalt, enabling epoxy resin to be evenly dispersed in asphalt, improving the compatibility between the two, enhancing the adhesion of asphalt, and improving flexibility and durability. Detailed implementation mode

[0028] The embodiment of the present application discloses an epoxy grafted composite modified asphalt. Except for special instructions, the raw materials used in this application can be obtained from commercially available raw materials. The following further details the present application in combination with the embodiments: Raw material description: Tall oil fatty acid (CAS No.: 61790-12-3), activated clay (CAS No.: 70131-50-9), diethylenetriamine (CAS No.: 111-40-0), the matrix asphalt is 70# matrix asphalt, the SBS model is Yuehua 791H, the particle size of the rubber powder is 40 mesh, the epoxy resin model is E-51, dicyandiamide (CAS No.: 461-58-5), adipic acid (CAS No.: 124-04-9), sodium dimethyldithiocarbamate (CAS No.: 128-04-1), coumarone resin (CAS No.: 63393-89-5), linolenic acid (CAS No.: 463-40-1), N-(n-butyl)-3-aminopropyltrimethoxysilane (CAS No.: 31024-56-3), vanillin (CAS No.: 121-33-5).

[0029] Example 1 Preparation of polyamide curing agent Mix and seal tall oil fatty acid and activated clay according to a mass ratio of 1:0.05, stir and heat up to 250 °C at a speed of 200 rpm for 8 h to obtain a mixture; filter the mixture, rectify the obtained filtrate, and collect the fraction at 260-300 °C to obtain tall oil fatty acid dimeric acid; mix 7.14 kg of tall oil fatty acid dimeric acid and 2.86 kg of diethylenetriamine, add 2 L of toluene, stir at a speed of 300 rpm, heat up to 180 °C at a speed of 2 °C / min for 5 h, and after cooling to below 30 °C, rotary evaporate to remove toluene to obtain the polyamide curing agent.

[0030] Preparation of epoxy grafted composite modified asphalt 81 kg of matrix asphalt was stirred and heated to 140 °C at a speed of 50 rpm, 5 kg of SBS was added, the rotation speed was increased to 400 rpm and stirred for 1 h to obtain a preliminary mixture; 14 kg of rubber powder was added to the preliminary mixture, stirred and heated to 160 °C at a speed of 500 rpm, and after reacting for 1 h, modified asphalt was obtained; 10 kg of epoxy resin component was added to 90 kg of modified asphalt, and stirred and reacted at 170 °C at a speed of 500 rpm for 1.5 h, and after cooling to below 30 °C, it was discharged to obtain epoxy grafted composite modified asphalt. The mass ratio of epoxy resin, polyamide curing agent and dicyandiamide in the epoxy resin component was 1:0.5:0.08.

[0031] Example 2 Preparation of polyamide curing agent Tall oil fatty acid and activated clay were mixed and sealed according to a mass ratio of 1:0.05, stirred and heated to 250 °C at a speed of 200 rpm and reacted for 8 h to obtain a mixture; the mixture was filtered, and the filtrate was rectified to collect the fraction at 260 - 300 °C to obtain tall oil fatty acid dimer acid; 7.78 kg of tall oil fatty acid dimer acid and 2.22 kg of diethylenetriamine were mixed, 2 L of toluene was added, stirred at a speed of 300 rpm, heated to 180 °C at a speed of 2 °C / min and reacted for 5 h. After cooling to below 30 °C, toluene was removed by rotary evaporation to obtain the polyamide curing agent.

[0032] Preparation of epoxy grafted composite modified asphalt 81 kg of matrix asphalt was stirred and heated to 140 °C at a speed of 50 rpm, 5 kg of SBS was added, the rotation speed was increased to 400 rpm and stirred for 1 h to obtain a preliminary mixture; 14 kg of rubber powder was added to the preliminary mixture, stirred and heated to 160 °C at a speed of 500 rpm, and after reacting for 1 h, modified asphalt was obtained; 6 kg of epoxy resin component was added to 94 kg of modified asphalt, and stirred and reacted at 170 °C at a speed of 500 rpm for 1.5 h, and after cooling to below 30 °C, it was discharged to obtain epoxy grafted composite modified asphalt. The mass ratio of epoxy resin, polyamide curing agent and dicyandiamide in the epoxy resin component was 1:0.5:0.08.

[0033] Example 3 Preparation of polyamide curing agent Mix tall oil fatty acid and activated clay in a mass ratio of 1:0.05, seal the mixture, stir and heat it to 250 °C at a speed of 200 rpm for 8 h to obtain a mixture; filter the mixture, rectify the obtained filtrate, and collect the fraction at 260 - 300 °C to obtain tall oil fatty acid dimer acid; mix 7.5 kg of tall oil fatty acid dimer acid and 2.5 kg of diethylenetriamine, add 2 L of toluene, stir at a speed of 300 rpm, heat it to 180 °C at a speed of 2 °C / min for 5 h, and after cooling to below 30 °C, remove toluene by rotary evaporation to obtain a polyamide curing agent.

[0034] Preparation of epoxy grafted composite modified asphalt Stir 81 kg of matrix asphalt at a speed of 50 rpm and heat it to 140 °C, add 5 kg of SBS, increase the rotation speed to 400 rpm and stir for 1 h to obtain a preliminary mixture; add 14 kg of rubber powder to the preliminary mixture, stir and heat it to 160 °C at a speed of 500 rpm, and after reacting for 1 h, obtain modified asphalt; add 8 kg of epoxy resin component to 92 kg of modified asphalt, stir and react at 170 °C at a speed of 500 rpm for 1.5 h, and after cooling to below 30 °C, discharge to obtain epoxy grafted composite modified asphalt. The mass ratio of epoxy resin, polyamide curing agent and dicyandiamide in the epoxy resin component is 1:0.5:0.08.

[0035] Example 4 Example 4 is based on Example 3. The difference between Example 4 and Example 3 is only that the dosage of tall oil fatty acid dimer acid in Example 4 is 6.67 kg and the dosage of diethylenetriamine is 3.33 kg.

[0036] Example 5 Example 5 is based on Example 3. The difference between Example 5 and Example 3 is only that the dosage of tall oil fatty acid dimer acid in Example 5 is 8 kg and the dosage of diethylenetriamine is 2 kg.

[0037] Example 6 Example 6 is based on Example 3. The difference between Example 6 and Example 3 is only that in Example 6, tall oil fatty acid dimer acid is replaced by adipic acid.

[0038] Example 7 Example 7 is based on Example 3. The difference between Example 7 and Example 3 is only that sodium dimethyldithiocarbamate and coumarone resin are added when preparing modified asphalt in Example 7.

[0039] 81 kg of matrix asphalt was stirred and heated to 140 °C at a speed of 50 rpm, 5 kg of SBS was added, the rotation speed was increased to 400 rpm and stirred for 1 h to obtain a preliminary mixture; 0.5 kg of sodium dimethyldithiocarbamate was dispersed in 5 L of toluene to obtain a dispersion, 14 kg of rubber powder and the dispersion were added to the preliminary mixture, stirred and heated to 160 °C at a speed of 500 rpm, after reacting for 1 h, 6 kg of coumarone resin was added, and stirred and reacted at 180 °C at a speed of 1000 rpm for 60 min to obtain modified asphalt; 10 kg of epoxy resin component was added to 90 kg of modified asphalt, stirred and reacted at 170 °C at a speed of 500 rpm for 1.5 h, and after cooling to below 30 °C, it was discharged to obtain epoxy grafted composite modified asphalt. The mass ratio of epoxy resin, polyamide curing agent and dicyandiamide in the epoxy resin component was 1:0.5:0.08.

[0040] Preparation Example 1 Preparation of modified epoxy resin 3.62 kg of linolenic acid, 3.69 kg of N-(n-butyl)-3-aminopropyltrimethoxysilane and 2.37 kg of vanillin were mixed and dispersed in 25 L of toluene, stirred at a speed of 300 rpm at 35 °C for 50 min, heated to 60 °C and reacted for 2 h. After cooling to 30 °C, the solvent was removed by rotary evaporation to obtain a modifier.

[0041] Example 8 Example 8 was based on Example 3. The difference between Example 8 and Example 3 was only that in Example 8, the epoxy resin was modified with the modifier prepared in Preparation Example 1.

[0042] Preparation of modified epoxy resin 100 kg of epoxy resin was stirred and heated to 80 °C at a speed of 50 rpm, 20 kg of modifier was added, and stirred and reacted at a speed of 300 rpm for 1 h. After cooling to below 30 °C, it was discharged to obtain modified epoxy resin.

[0043] Example 9 Example 9 was based on Example 8. The difference between Example 9 and Example 8 was only that in Example 9, the modifier was replaced with N-(n-butyl)-3-aminopropyltrimethoxysilane.

[0044] Comparative Example 1 Comparative Example 1 was based on Example 3. The difference between Comparative Example 1 and Example 3 was only that in Comparative Example 1, the modified asphalt was replaced with matrix asphalt.

[0045] Comparative Example 2 Comparative Example 2 was based on Example 3. The difference between Comparative Example 2 and Example 3 was only that in Comparative Example 2, the curing agent was replaced with polyamide curing agent.

[0046] Performance detection test (1) Tensile property test: Prepare specimens and conduct experiments using a tensile testing machine. The tensile temperature is 23 °C, and the specimens are stretched at a rate of 50 mm / min until they break. The maximum load and deformation at the moment of specimen fracture are obtained through the sensors of the testing machine. According to the numerical values of the specimen cross-sectional dimensions, the tensile strength and elongation at break of the specimen are calculated, and the results are recorded in Table 1.

[0047] (2) Dynamic stability test: Mix aggregate, specimen, and mineral powder according to a mass ratio of 6:1:3 to prepare asphalt mixture. The aggregate is a mixture of basalt and manufactured sand with a weight ratio of 2:1, and the mineral powder is limestone powder; make the asphalt mixture into specimens with dimensions of 300 mm × 300 mm × 50 mm, install the specimens on the test bench of the rutting testing machine, preheat them in an environment of 60 °C, and the tire pressure is 0.7 MPa. During the test, the rubber tire walks back and forth on the specimen surface at a speed of 42 times / min, and at the same time, continuously record the deformation of the specimen surface. The dynamic stability is expressed by the number of walking times required to produce a 1 mm rutting deformation, with the unit of times / mm, and the results are recorded in Table 2. Each specimen is tested three times, and the average value is taken after measurement, and the results are recorded in Table 1.

[0048] (3) Low-temperature crack resistance experiment: Mix aggregate, specimen, and mineral powder according to a mass ratio of 6:1:3 to prepare asphalt mixture. The aggregate is a mixture of basalt and manufactured sand with a weight ratio of 2:1, and the mineral powder is limestone powder; pour the asphalt mixture into specimens, cut the specimens into beam specimens with dimensions of 250 mm × 30 mm × 35 mm, conduct a low-temperature beam bending test, the test temperature is -10 °C, and the loading rate is 50 mm / min, calculate the bending ultimate strain, and the results are recorded in Table 1.

[0049] Table 1 Detection results of tensile properties and high and low temperature properties of epoxy grafted composite modified asphalt As can be seen from Table 1, the tensile strength of Examples 1-3 is greater than 2.6 MPa, the elongation at break is greater than 213%, the dynamic stability is greater than 13752 times / mm, and the bending ultimate strain is greater than 3275 με. Thus, it can be seen that the epoxy grafted composite modified asphalt prepared in this application has good compatibility, adhesion properties, and high and low temperature properties.

[0050] As can be seen from Table 1, the differences between Examples 4 and 5 and Example 3 are only as follows: in Example 4, the mass ratio of tall oil fatty acid dimer acid to diethylenetriamine is 2:1, and in Example 5, the mass ratio of tall oil fatty acid dimer acid to diethylenetriamine is 4:1. Compared with Example 3, the performance of the asphalt in Examples 4 and 5 has decreased; this is because too much or too little tall oil fatty acid dimer acid will affect the reaction activity and crosslinking density of the polyamide curing agent, and further affect the compatibility between the epoxy resin and the asphalt, thus affecting the performance.

[0051] As can be seen from Table 1, the difference between Example 6 and Example 3 is only that in Example 6, the tall oil fatty acid dimer acid is replaced by adipic acid. Compared with Example 3, the performance has decreased; this is because when the tall oil fatty acid dimer acid is replaced by adipic acid, the stability of the formed crosslinked network and crosslinked structure decreases, and the intermolecular interaction weakens, thus reducing the performance of the epoxy grafted composite modified asphalt.

[0052] As can be seen from Table 1, the difference between Example 7 and Example 3 is only that in Example 7, sodium dimethyldithiocarbamate and coumarone resin are added during the preparation of the modified asphalt. Compared with Example 3, the performance of the epoxy grafted composite modified asphalt has increased; this is because sodium dimethyldithiocarbamate and coumarone resin can improve the dispersibility and compatibility of the components in the asphalt, reduce the interfacial tension, thus improving the stability of the asphalt and enhancing the high and low temperature performance.

[0053] As can be seen from Table 1, the differences between Examples 8 and 9 and Example 3 are only that in Example 8, the epoxy resin is modified with a modifier, and in Example 9, the modifier is replaced by N-(n-butyl)-3-aminopropyltrimethoxysilane. Compared with Example 3, the performance in Examples 8 and 9 has increased; this is because the modifier can enhance the intermolecular force and improve the crosslinking degree of the epoxy resin, thus improving the stability and the ability to resist deformation, and enhancing the high and low temperature performance of the asphalt; when the modifier is replaced by N-(n-butyl)-3-aminopropyltrimethoxysilane in Example 9, the improvement effect decreases.

[0054] As can be seen from Table 1, the difference between Comparative Example 1 and Example 3 is only that in Comparative Example 1, the modified asphalt is replaced by matrix asphalt. Compared with Example 3, the performance has decreased significantly; this is because the lack of modification treatment with SBS and rubber powder results in a decrease in the flexibility and deformation resistance of the asphalt, and a weakening of the adhesion force, thus significantly reducing the performance.

[0055] As can be seen from Table 1, the difference between Comparative Example 2 and Example 3 is only that: in Comparative Example 2, the curing agent is replaced with a polyamide curing agent. Compared with Example 3, the performance of Comparative Example 2 has decreased; this is because the lack of the compounding synergistic effect of the curing agent. A single polyamide curing agent will cause an increase in flexibility, a decrease in tensile strength, and a poor ability to resist deformation, resulting in a decrease in high-temperature performance.

[0056] This specific embodiment is only an explanation of the present application, and it does not limit the present application. Through the above description, relevant staff can make various changes and modifications completely within the scope without deviating from the technical idea of this application. The technical scope of this application is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An epoxy grafted composite modified asphalt, characterized in that: Comprising the following components in parts by mass: 90 - 94 parts of modified asphalt 6 - 10 parts of epoxy resin component; The epoxy resin component includes epoxy resin and compatibilizing curing agent.

2. An epoxy grafted composite modified asphalt according to claim 1, characterized in that: The raw materials for preparing the modified asphalt include SBS, rubber powder and base asphalt.

3. The epoxy grafted composite modified asphalt according to claim 2, characterized in that: The raw materials for preparing the modified asphalt also include sodium dimethyldithiocarbamate and coumarone resin.

4. An epoxy grafted composite modified asphalt according to claim 1, wherein: The epoxy resin is subjected to modification treatment to obtain modified epoxy resin, and the raw materials for preparing the modified epoxy resin include epoxy resin body and modifier.

5. An epoxy grafted composite modified asphalt according to claim 4, characterized in that: The raw materials for preparing the modifier include linolenic acid, N-(n-butyl)-3-aminopropyltrimethoxysilane and vanillin.

6. The epoxy grafted composite modified asphalt according to claim 5, wherein: The modifier is prepared by the following steps: Mix and disperse linolenic acid, N-(n-butyl)-3-aminopropyltrimethoxysilane and vanillin in toluene, heat and stir, then raise the temperature for reaction. After cooling, remove the solvent by rotary evaporation to obtain the modifier.

7. An epoxy grafted composite modified asphalt according to claim 1, characterized in that: The compatibilizing curing agent includes polyamide curing agent and dicyandiamide.

8. An epoxy grafted composite modified asphalt according to claim 7, characterized in that: The raw materials for preparing the polyamide curing agent include tall oil fatty acid dimer acid and diethylenetriamine.

9. An epoxy-grafted composite modified asphalt according to claim 8, characterized in that: The mass ratio of the tall oil fatty acid dimer acid to the diethylenetriamine is (2.5 - 3.5):

1.

10. An epoxy graft composite modified asphalt according to any one of claims 1-9, characterized in that: The epoxy grafted composite modified asphalt is prepared by the following steps: Stir and heat up the base asphalt, add SBS, increase the rotation speed and stir to obtain a preliminary mixture; add the rubber powder to the preliminary mixture, stir and heat up for reaction to obtain modified asphalt; Add the epoxy resin component to the modified asphalt, heat and stir for reaction, and discharge after cooling to obtain the epoxy grafted composite modified asphalt.

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