High-modulus impact-resistant modified asphalt, asphalt mixture as well as preparation method and application of high-modulus impact-resistant modified asphalt and asphalt mixture

Abstract

The invention discloses high-modulus impact-resistant modified asphalt, which is mainly prepared from the following components in parts by weight: 2 to 7 parts of 2-(2-ethoxyl)-3A, 4, 7, 7A-tetrahydro-1H-4, 7-methoxy isoindole-1, 3 (2H)-diketone, 2 to 9 parts of gamma-phenyl-epsilon-caprolactone, 85 to 90 parts of matrix asphalt, 0.0003 to 0.0007 part of tricyclic [6.4.0.02, 7] dodecane-1, 8: 2, 7-tetracarboxylic acid dianhydride, and 0.001 to 0.003 part of stannous octoate (per mil). The invention also provides a preparation method of the high-modulus impact-resistant modified asphalt. The invention also provides an asphalt mixture. The invention also provides application of the asphalt mixture as a road building material in road maintenance or road construction. According to the high-modulus impact-resistant modified asphalt provided by the invention, gamma-phenyl-epsilon-caprolactone completes chain propagation, unreacted hydroxyl at the tail end and carboxylic acid groups newly generated after ring opening of tricyclic [6.4. 0.02, 7] dodecane-1, 8: 2, 7-tetracarboxylic dianhydride can form a large number of hydrogen bonds with ester groups on a long chain, so that network structures have stronger acting force, and the impact resistance of the asphalt is improved. And the impact resistance and energy absorption performance are higher.

Description

Technical Field

[0001] The invention relates to the field of asphalt modification, and in particular to a high modulus impact-resistant modified asphalt, an asphalt mixture, and a preparation method and application thereof. Background Art

[0002] Asphalt pavement construction in my country has developed rapidly and its scale has been continuously expanded. With the continuous growth of traffic volume and the intensification of climate change, the challenges faced by asphalt pavement are becoming more and more severe. For conventional roads, asphalt mixture can meet its needs due to its viscoelastic plasticity; however, for heavy-loaded roads or roads in extreme environments, such as when the asphalt pavement is subjected to high temperature for a long time or high load and the load stress exceeds the stability limit of the asphalt mixture, road rutting, road deformation, road loosening and other phenomena will occur. Therefore, the selection of impact-resistant and high-toughness asphalt materials can improve the adhesion and cohesion of the effective asphalt mixture, thereby improving its load limit, and high modulus has also become very important. Summary of the invention

[0003] The purpose of the present invention is to provide a high modulus impact-resistant modified asphalt, asphalt mixture and its preparation method and application in view of the deficiencies in the prior art. The present invention solves the above-mentioned disease problems by introducing a large amount of comb-shaped cross-linked structure polymers to improve the modulus of modified asphalt. The present invention aims to improve the durability and stability of the road surface. By using high modulus modified asphalt to increase its load limit, it can better resist road rutting, deformation and other problems, thereby improving the flatness and comfort of the road surface. Under the same cumulative axle action, the thickness can be thinner, and the bearing capacity and service life can still meet the design requirements or even higher.

[0004] The technical solution of the present invention is achieved in this way: A high modulus impact-resistant modified asphalt is mainly prepared from the following components in parts by weight: 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione 2-7 parts, γ-phenyl-ε-caprolactone 2-9 parts, base asphalt 85-90 parts, tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride 0.0003 parts to 0.0007 parts, stannous octoate 0.001 parts to 0.003 parts per thousand. Of course, other additives can be appropriately added according to different specific application environments.

[0005] Preferably, a high modulus impact-resistant modified asphalt is mainly prepared from the following components in parts by weight: 2 to 4 parts of 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione, 8 to 9 parts of γ-phenyl-ε-caprolactone, 88 to 90 parts of base asphalt, 0.0003 to 0.0005 parts of tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride, and 0.002 to 0.003 parts of stannous octoate.

[0006] The inventive principle of the present invention is as follows: 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione and γ-phenyl-ε-caprolactone undergo a ring-opening reaction under high temperature conditions with stannous octoate as a catalyst. As the reaction continues, the γ-phenyl-ε-caprolactone completes chain growth to generate a long-chain ester structure containing a hydroxyl group at the end, which can effectively improve the modulus of the modified asphalt and the viscosity of the modified asphalt. The ester-based substances produced by the reaction are more easily dispersed in the asphalt phase due to their similar polarity to asphalt, which not only effectively reduces the surface tension of the asphalt, but also helps to improve the adhesion of the modified asphalt. At the same time, the norbornene structure in 2-(2-hydroxy)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione can undergo a double decomposition polymerization reaction, and the generated five-membered ring structure polymer is arranged in a comb shape, thereby improving the modulus and shear resistance of the asphalt. γ-phenyl-ε-caprolactone completes self-polymerization chain growth and its benzene ring structure is also arranged in a comb-like manner, which effectively improves the modulus of the modified asphalt. The hydroxyl group at the end of the chain growth can also undergo a nucleophilic addition reaction with tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride to introduce a new tricyclic structure, which can effectively improve the modulus of the modified asphalt. Finally, a five-membered ring and benzene ring are arranged in a "comb-like" manner, and the long chains with ester groups are "embedded" with tricyclic structures that are cross-linked with each other. The terminal hydroxyl group and the newly generated carboxylic acid group can also form a large number of hydrogen bonds with the ester group on the long chain, which makes the network structure have a stronger force and higher impact resistance and energy absorption performance. Under the joint action of the above substances, the modified asphalt has the advantages of high modulus and impact resistance.

[0007]

[0008] The high modulus impact-resistant modified asphalt as mentioned above, the base asphalt is 70# base asphalt. 70# base asphalt has good durability and stability.

[0009] In the high modulus impact-resistant modified asphalt as described above, the density of stannous octoate is 1.251 g / cm³. Stannous octoate acts as a catalyst, with high reaction efficiency and fast reaction speed.

[0010] Based on the same inventive concept, the present invention provides a method for preparing a high modulus impact-resistant modified asphalt, comprising the following steps: Step 1, stir and heat the base asphalt to 140-180°C, add 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione into the base asphalt according to a set ratio and disperse it evenly in a high-speed mixer at a speed of 800-2000R / min for 0.5-3h to obtain material 1; preferably, the heating temperature is 160°C, the speed is 1200-1600R / min, and the time is 0.5-1.5h.

[0011] Step 2: At 140-180° C., add γ-phenyl-ε-caprolactone and stannous octoate to material 1 according to a set ratio, and disperse them evenly in a high-speed stirrer at a speed of 400-2000R / min for 0.5-3h to obtain material 2; preferably, the heating temperature is 160° C., the speed is 1400-1600R / min, and the time is 1-2h.

[0012] Step three: add tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride to material 2 at a set ratio at 140-180°C, disperse evenly in a high-speed stirrer at a speed of 400-2000R / min for 0.5-4h to obtain high modulus impact-resistant modified asphalt; preferably, the heating temperature is 180°C, the speed is 1400-1600R / min, and the time is 3-4h.

[0013] Based on the same inventive concept, the present invention also provides a high modulus impact-resistant modified asphalt mixture, the raw materials of which include a high modulus impact-resistant modified asphalt as described above, and the mass fraction of the high modulus impact-resistant modified asphalt in the high modulus impact-resistant modified asphalt mixture is 4.4% to 6%. Preferably, the mass fraction of the high modulus impact-resistant modified asphalt in the high modulus impact-resistant modified asphalt mixture is 4.6% to 5.8%. Most preferably, the mass fraction of the high modulus impact-resistant modified asphalt in the high modulus impact-resistant modified asphalt mixture is 5.2%.

[0014] Based on the same inventive concept, the present invention also provides the use of the high modulus impact-resistant modified asphalt as described above or the high modulus impact-resistant modified asphalt mixture as described above as a road building material in road maintenance or road construction.

[0015] The beneficial effects of the present invention are: 1. The present invention provides a high modulus impact-resistant modified asphalt, which is mainly prepared from the following components: 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione 2-7 parts, γ-phenyl-ε-caprolactone 2-9 parts, base asphalt 85-90 parts, tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride 0.0003 parts to 0.0007 parts, stannous octoate 0.001 parts to 0.003 parts per thousand. The norbornene structure in 2-(2-hydroxy)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione can undergo metathesis polymerization, so that the generated five-membered ring structure polymer is arranged in a comb-like pattern, thereby improving the modulus and shear resistance of the asphalt. γ-phenyl-ε-caprolactone completes self-polymerization chain growth and its benzene ring structure is also arranged in a comb-like manner, which effectively improves the modulus of the modified asphalt. The ring-opening reaction of γ-phenyl-ε-caprolactone completes chain growth to generate a long-chain ester structure containing a hydroxyl group at the end, which can effectively improve the modulus of the modified asphalt while improving the viscosity and toughness of the modified asphalt.

[0016] 2. The high modulus impact-resistant modified asphalt provided by the present invention, the unreacted hydroxyl group at the end of the chain growth of γ-phenyl-ε-caprolactone and the newly generated carboxylic acid group after the ring opening of tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride can form a large number of hydrogen bonds with the ester group on the long chain, so that the network structure has a stronger force and the impact resistance and energy absorption performance is higher.

[0017] 3. The high modulus impact-resistant modified asphalt provided by the present invention has an experimental result showing that the viscosity (25°C) is 24.5-28.4 Nm, indicating that the high modulus impact-resistant modified asphalt prepared by the present invention has the advantage of high modulus.

[0018] 4. The experimental results of the asphalt mixture prepared by the high modulus modified asphalt of the present invention show that its dynamic stability is 7623-8115 times / mm, indicating that the asphalt mixture prepared by using the high modulus impact-resistant modified asphalt has significant anti-rutting performance. DETAILED DESCRIPTION

[0019] The following will combine the contents in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0021] Unless otherwise specified, the experimental methods used in the following examples are conventional methods.

[0022] Unless otherwise specified, the materials and reagents used in the following examples can be obtained from commercial sources.

[0023] In the following examples, 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione was purchased from Jiangsu Aikang Biopharmaceutical Research and Development Co., Ltd., CAS No.: 1873-11-6. γ-phenyl-ε-caprolactone was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., CAS No.: 134339-50-7. Matrix asphalt was purchased from Jingbo Petrochemical 70# Matrix Asphalt. Tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., CAS No.: 738-90-9. Stannous octoate was purchased from Shandong Yihong Chemical Co., Ltd., CAS No.: 301-10-0, and its density is 1.251 g / cm³.

[0024] Embodiment 1: The present embodiment provides a high modulus impact-resistant modified asphalt, which is mainly prepared from the following components in parts by weight: 3 parts of 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione, 9 parts of γ-phenyl-ε-caprolactone, 89 parts of base asphalt, 0.0005 parts of tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride, and 0.002 parts of stannous octoate.

[0025] The high modulus impact-resistant modified asphalt modifier is prepared by the following preparation method, comprising the following steps: Step 1, stirring and heating the base asphalt to 160° C., adding 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione to the base asphalt according to a set ratio, and dispersing the mixture evenly in a high-speed mixer at a speed of 1400 R / min and a stirring time of 1 h to obtain material 1; Step 2: at 160° C., add γ-phenyl-ε-caprolactone and stannous octoate to material 1 according to a set ratio, disperse evenly in a high-speed stirrer at a speed of 1600 R / min and a stirring time of 1 h to obtain material 2; Step 3: Heat material 2 to 180°C, add tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride to material 2 according to the set ratio, and disperse evenly in a high-speed mixer at a speed of 1600R / min and a stirring time of 3h to obtain high modulus impact-resistant modified asphalt.

[0026] Embodiment 2: The present embodiment provides a high modulus impact-resistant modified asphalt, which is mainly prepared from the following components in parts by weight: 4 parts of 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione, 8 parts of γ-phenyl-ε-caprolactone, 89 parts of base asphalt, 0.0003 parts of tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride, and 0.003 parts of stannous octoate.

[0027] The high modulus impact-resistant modified asphalt modifier is prepared by the following preparation method, comprising the following steps: Step 1, stirring and heating the base asphalt to 160° C., adding 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione to the base asphalt according to a set ratio, and dispersing the mixture evenly in a high-speed mixer at a speed of 1200 R / min and a stirring time of 0.5 h to obtain material 1; Step 2: at 160° C., add γ-phenyl-ε-caprolactone and stannous octoate to material 1 in a set ratio and disperse them evenly in a high-speed stirrer at a speed of 1400 R / min and a stirring time of 1 h to obtain material 2; Step 3: Heat material 2 to 180°C, add tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride to material 2 according to the set ratio and disperse evenly in a high-speed mixer at a speed of 1600R / min and a stirring time of 2h to obtain high modulus impact-resistant modified asphalt.

[0028] Embodiment 3: The present invention provides a high modulus impact-resistant modified asphalt, which is mainly prepared from the following components in parts by weight: 2 parts of 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione, 8 parts of γ-phenyl-ε-caprolactone, 88 parts of base asphalt, 0.0004 parts of tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride, and 0.003 parts of stannous octoate.

[0029] The high modulus impact-resistant modified asphalt modifier is prepared by the following preparation method, comprising the following steps: Step 1, stirring and heating the base asphalt to 160° C., adding 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione to the base asphalt according to a set ratio, and dispersing the mixture evenly in a high-speed mixer at a speed of 1600 R / min and a stirring time of 1 h to obtain material 1; Step 2: at 160° C., add γ-phenyl-ε-caprolactone and stannous octoate to material 1 according to a set ratio, disperse evenly in a high-speed stirrer at a speed of 1600 R / min and a stirring time of 2 h to obtain material 2; Step 3: Heat material 2 to 180°C, add tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride to material 2 according to the set ratio, and disperse evenly in a high-speed mixer at a speed of 1600R / min and a stirring time of 3h to obtain high modulus impact-resistant modified asphalt.

[0030] Embodiment 4: The present invention provides a high modulus impact-resistant modified asphalt, which is mainly prepared from the following components in parts by weight: 3 parts of 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione, 8 parts of γ-phenyl-ε-caprolactone, 89 parts of base asphalt, 0.0004 parts of tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride, and 0.002 parts of stannous octoate.

[0031] The high modulus impact-resistant modified asphalt modifier is prepared by the following preparation method, comprising the following steps: Step 1, stirring and heating the base asphalt to 160° C., adding 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione to the base asphalt according to a set ratio, and dispersing the mixture evenly in a high-speed mixer at a speed of 1200 R / min and a stirring time of 1.5 h to obtain material 1; Step 2: at 160° C., add γ-phenyl-ε-caprolactone and stannous octoate to material 1 according to a set ratio, and disperse them evenly in a high-speed stirrer at a speed of 1400 R / min and a stirring time of 1 h to obtain material 2; Step 3: Heat material 2 to 180°C, add tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride to material 2 according to the set ratio, and disperse evenly in a high-speed mixer at a speed of 1400R / min and a stirring time of 4h to obtain high modulus impact-resistant modified asphalt.

[0032] Embodiment 5: The present invention provides a high modulus impact-resistant modified asphalt, which is mainly prepared from the following components in parts by weight: 4 parts of 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione, 8 parts of γ-phenyl-ε-caprolactone, 90 parts of base asphalt, 0.0005 parts of tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride, and 0.003 parts of stannous octoate.

[0033] The high modulus impact-resistant modified asphalt modifier is prepared by the following preparation method, comprising the following steps: Step 1, stirring and heating the base asphalt to 160° C., adding 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione to the base asphalt according to a set ratio, and dispersing the mixture evenly in a high-speed mixer at a speed of 1600 R / min and a stirring time of 0.5 h to obtain material 1; Step 2: at 160° C., add γ-phenyl-ε-caprolactone and stannous octoate to material 1 according to a set ratio, and disperse them evenly in a high-speed stirrer at a speed of 1400 R / min and a stirring time of 1 h to obtain material 2; Step 3: Heat material 2 to 180°C, add tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride to material 2 according to the set ratio, and disperse evenly in a high-speed mixer at a speed of 1400R / min and a stirring time of 4h to obtain high modulus impact-resistant modified asphalt.

[0034] Comparative Example 1: This comparative example provides a modified asphalt, which is mainly prepared from the following components in parts by weight: 3 parts of N-(2-hydroxyethyl)phthalimide, 9 parts of γ-phenyl-ε-caprolactone, 89 parts of base asphalt, 0.0005 parts of tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride, and 0.002 parts of stannous octoate. Among them, N-(2-hydroxyethyl)phthalimide, CAS No.: 3891-07-4, was purchased from Ruierfeng Chemical Co., Ltd. The same γ-phenyl-ε-caprolactone, base asphalt, tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride and stannous octoate as in Example 1 were used.

[0035] The modified asphalt is prepared by the following preparation method, comprising the following steps: Step 1, stirring and heating the base asphalt to 160° C., adding N-(2-hydroxyethyl)phthalimide to the base asphalt according to a set ratio, and dispersing it evenly in a high-speed mixer at a speed of 1400 R / min and a stirring time of 1 h, to obtain material 1; Step 2: at 160° C., add γ-phenyl-ε-caprolactone and stannous octoate to material 1 according to a set ratio, disperse evenly in a high-speed stirrer at a speed of 1600 R / min and a stirring time of 1 h to obtain material 2; Step 3: Heat material 2 to 180°C, add tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride to material 2 according to a set ratio, and disperse evenly in a high-speed mixer at a speed of 1600R / min and a stirring time of 3h to obtain modified asphalt.

[0036] Comparative Example 2: This comparative example provides a modified asphalt, which is mainly prepared from the following components in parts by weight: 3 parts of 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione, 9 parts of ε-caprolactone, 89 parts of base asphalt, 0.0005 parts of tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride, and 0.002 parts of stannous octoate. Among them, ε-caprolactone was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., CAS No.: 502-44-3. The same 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione, base asphalt, tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride and stannous octoate as in Example 1 were used.

[0037] The high modulus impact-resistant modified asphalt is prepared by the following preparation method, comprising the following steps: Step 1, stirring and heating the base asphalt to 160° C., adding 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione to the base asphalt according to a set ratio, and dispersing the mixture evenly in a high-speed mixer at a speed of 1400 R / min and a stirring time of 1 h to obtain material 1; Step 2: at 160° C., ε-caprolactone and stannous octoate are added to material 1 according to a set ratio, and dispersed evenly in a high-speed stirrer at a speed of 1600 R / min and a stirring time of 1 h to obtain material 2; Step 3: Heat material 2 to 180°C, add tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride into material 2 according to a set ratio, and disperse evenly in a high-speed mixer at a speed of 1600R / min and a stirring time of 3h to obtain modified asphalt.

[0038] Comparative Example 3: A modified asphalt prepared from a commercially available high modulus asphalt additive is mainly prepared from the following components in parts by weight: 12 parts of a high modulus asphalt additive and 89 parts of a base asphalt. The base asphalt is the same as that in Example 1.

[0039] The high modulus impact-resistant modified asphalt is prepared by the following preparation method, comprising the following steps: The base asphalt is stirred and heated to 180°C, and the commercially available high modulus asphalt additive is added to the base asphalt according to a set ratio. It is evenly dispersed in a high-speed mixer at a speed of 1600R / min and a stirring time of 4h to obtain modified asphalt.

[0040] The high modulus impact-resistant modified asphalt of the present invention and the modified asphalt of the comparative example are characterized by the test performance indexes of the prepared modified asphalt. The various related indexes of the asphalt mixture are tested according to the standard "JTGE20-2011 Highway Engineering Asphalt and Asphalt Mixture Test Procedure".

[0041] In order to characterize the performance of the high modulus impact-resistant modified asphalt prepared in Examples 1 to 5 and compare them with the modified asphalt of Comparative Examples 1 to 3, the modified asphalt and asphalt mixture prepared using Examples 1 to 5 and Comparative Examples 1 to 3 were respectively subjected to performance tests. Specific test evaluation results are shown in Tables 1 and 2.

[0042] Table 1 Test results of modified asphalt

[0043] According to the performance data of the modified asphalt of Examples 1 to 5 and Comparative Examples 1 to 3 in Table 1, the viscosity and toughness of Examples 1 to 5 are significantly improved compared with Comparative Examples 1 to 3, indicating that the high modulus impact-resistant modified asphalt prepared by the present invention has the advantage of high modulus. Among them, compared with Example 1, the viscosity and toughness of the modified asphalt prepared by N-(2-hydroxyethyl)phthalimide instead of 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione in Comparative Example 1 are significantly reduced, indicating that the comb-like structure formed by the use of 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione effectively improves the modulus of the modified asphalt.

[0044] The standard asphalt mixture was prepared and tested according to GB / T 36143-2018 High modulus anti-fatigue asphalt mixture for roads, in which the amount of modified asphalt was 5.2%.

[0045] Table 2 Test results of modified asphalt mixture

[0046] According to Table 2, the dynamic stability performance of Examples 1 to 5 is significantly improved compared with Comparative Examples 1 to 3, indicating that the asphalt mixture prepared using high modulus impact-resistant modified asphalt has significant anti-rutting performance.

[0047] The test results of Tables 1 and 2 of Examples 1 to 5 and Comparative Examples 1 to 3 show that the high modulus impact-resistant modified asphalt of the present invention has a relatively high modulus and the asphalt mixture prepared therefrom has significant anti-rutting performance. In other words, 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione, γ-phenyl-ε-caprolactone, tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride, and stannous octoate must be used in combination to achieve the overall comprehensive performance of the material. Replacing similar components cannot achieve the excellent effect of the present invention.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high modulus impact-resistant modified asphalt, characterized in that: It is mainly prepared from the following components in parts by weight: 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione 2-7 parts, γ-phenyl-ε-caprolactone 2-9 parts, base asphalt 85-90 parts, tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride 0.0003 parts to 0.0007 parts, and 0.001 parts to 0.003 parts of stannous octoate.

2. The high modulus impact-resistant modified asphalt according to claim 1, characterized in that: The base asphalt is 70# base asphalt.

3. The high modulus impact-resistant modified asphalt according to claim 1, characterized in that: It is mainly prepared from the following components in parts by weight: 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione 2-4 parts, γ-phenyl-ε-caprolactone 8-9 parts, base asphalt 88-90 parts, tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride 0.0003-0.0005 parts, and 0.002-0.003 parts of stannous octoate.

4. The method for preparing high modulus impact-resistant modified asphalt according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1, stirring and heating the base asphalt to 130-180° C., adding 2-(2-hydroxyethyl)-3A,4,7,7A-tetrahydro-1H-4,7-methoxyisoindole-1,3(2H)-dione to the base asphalt according to a set ratio, and dispersing the mixture evenly in a high-speed mixer to obtain material 1; Step 2: at 130-180° C., add γ-phenyl-ε-caprolactone and stannous octoate to material 1 according to a set ratio, and disperse them evenly in a high-speed stirrer to obtain material 2; Step 3: At 130-180° C., add tricyclo[6.4.0.02,7]dodecane-1,8:2,7-tetracarboxylic dianhydride to material 2 according to a set ratio, and disperse evenly in a high-speed mixer to obtain a high modulus impact-resistant modified asphalt.

5. The method for preparing high modulus impact-resistant modified asphalt according to claim 4, characterized in that: The rotation speed of step 1 is 400R / min-2000R / min, and the stirring time is 0.5-3h.

6. The method for preparing high modulus impact-resistant modified asphalt according to claim 4, characterized in that: The rotation speed of step 2 is 400R / min to 2000R / min, and the stirring time is 0.5 to 3h.

7. The method for preparing high modulus impact-resistant modified asphalt according to claim 4, characterized in that: The rotation speed of step three is 400R / min-2000R / min, and the stirring time is 0.5-5h.

8. An asphalt mixture, characterized in that: A high modulus impact-resistant modified asphalt prepared by the preparation method described in claims 1 to 3 or claim 4.

9. The asphalt mixture according to claim 5, characterized in that: The mass fraction of the high modulus impact-resistant modified asphalt in the asphalt mixture is 4.4% to 6%.

10. Use of the high modulus impact-resistant modified asphalt according to claims 1 to 3 or the high modulus impact-resistant modified asphalt prepared by the preparation method of claim 4 or the asphalt mixture according to claims 5 to 6 as road building materials in road maintenance or road construction.

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