Anti-aging modified asphalt composition and preparation method thereof

Abstract

The invention discloses an anti-aging modified asphalt composition and a preparation method thereof. The anti-aging modified asphalt composition comprises the following components in parts by weight: 100 parts of matrix asphalt; 2-13 parts of a polymer modifier; 0.1-1 part of a vulcanizing agent; 0.01 to 0.3 part of a vulcanization accelerator; the polymer modifier comprises SBS and a monomeric compound. The anti-aging modified asphalt composition can effectively inhibit the aging process of asphalt under the photo-thermal condition, physical migration and volatilization of the anti-aging agent are avoided, meanwhile, the asphalt and the additive have good compatibility, and the modified asphalt is not prone to rutting at the high temperature and not prone to frost cracking at the low temperature.

Description

Technical Field

[0001] The invention belongs to the field of road modified asphalt, and particularly relates to an anti-aging modified asphalt composition and a preparation method thereof. Background Art

[0002] With the development of economy, the traffic volume has increased rapidly, and high-grade highways have developed very fast. High-grade highways need to be equipped with high-performance asphalt, but petroleum asphalt is highly temperature-sensitive, flows at high temperatures, and becomes brittle at low temperatures, and cannot fully meet the requirements of high-grade highways. In order to overcome the above-mentioned shortcomings of petroleum asphalt, modified asphalt has received widespread attention. Modified asphalt is to add a certain amount of modifier to asphalt to comprehensively improve the temperature sensitivity, stability, durability, adhesion, aging resistance and other aspects of asphalt. Among the many modifiers, polymer modifiers are the most widely used and studied. Among polymer modifiers, SBS (styrene-butadiene-styrene block copolymer) is widely used for its excellent tensile properties, good low temperature resistance, solubility and unique anti-skid properties.

[0003] At present, modified asphalt is widely used in asphalt pavement due to its excellent high and low temperature performance. However, it is easily affected by heat, light, oxygen and other factors during construction and service, resulting in thermal oxygen and ultraviolet aging, which greatly reduces the service life of asphalt pavement. In order to overcome this problem, technicians in this field have developed a variety of anti-aging modified asphalts, but the results are mostly unsatisfactory.

[0004] CN109401348A discloses an anti-aging modified asphalt, which heats and melts the matrix asphalt and then adds aliphatic polyurethane resin and SBS asphalt modifier for heat preservation and swelling, thereby improving the fluidity and anti-aging performance of the asphalt. CN111471308A discloses an anti-aging modified asphalt and a preparation method thereof, which adopts a stripping and assembly method, first stripping the layered manganese dioxide to obtain manganese dioxide nanosheets, then adding alkyl ammonium cations (dioctadecyl dimethyl ammonium chloride), reacting and assembling to obtain a supramolecular intercalation structure, and then stripping occurs during the mixing process with SBS rubber, generating nanosheets that are uniformly dispersed in the matrix asphalt, showing a UV shielding effect. CN111607242A discloses an anti-aging modified asphalt composition and a preparation method and use thereof, which uses N-isopropyl-N'-phenyl-p-phenylenediamine as an anti-aging agent to improve the anti-aging performance of the modified asphalt. CN114958020A discloses an anti-aging modified asphalt, which uses a mixture of 2,2,4-trimethyl-1,2-dihydroquinoline polymer and N-phenyl-2-naphthylamine as a composite antioxidant, wherein the 2,2,4-trimethyl-1,2-dihydroquinoline polymer inhibits the diffusion of highly active species such as superoxide radicals, peroxide radicals and hydroxyl radicals, and the N-phenyl-2-naphthylamine mainly shields ultraviolet light with a wavelength of less than 400nm.

[0005] In summary, the prior art generally adopts the method of adding antioxidants to asphalt to inhibit the aging of asphalt materials. However, if the antioxidant is simply added to asphalt, it will cause the antioxidant and asphalt to separate and stratify, as well as the physical migration and volatilization of the antioxidant. Although it can inhibit asphalt aging to a certain extent, the anti-aging performance is limited. In addition, due to the large differences in the composition and structure of SBS and asphalt, it is difficult to form a stable system when blended, and SBS and asphalt are prone to phase separation during hot storage. Therefore, it is urgent to develop a new anti-aging asphalt composition and preparation method thereof. Summary of the invention

[0006] In view of the shortcomings and defects of the prior art, the present invention provides an anti-aging modified asphalt composition and a preparation method thereof. The anti-aging modified asphalt composition of the present invention can effectively inhibit the aging process of asphalt under light and heat conditions, and physical migration and volatilization of the anti-aging agent will not occur. At the same time, the asphalt and the additive have good compatibility, which can make the modified asphalt less likely to have rutting at high temperatures and less likely to freeze and crack at low temperatures.

[0007] The first aspect of the present invention provides an anti-aging modified asphalt composition, which comprises the following components in parts by weight:

[0008] 100 parts of base asphalt;

[0009] 2 to 13 parts of polymer modifier, preferably 3 to 6 parts;

[0010] Vulcanizing agent 0.1-1 part;

[0011] Vulcanization accelerator 0.01-0.3 parts;

[0012] The polymer modifier includes SBS and a monomer compound.

[0013] The softening point of the matrix asphalt is 40-80° C. The matrix asphalt is selected from one or more of straight run asphalt, oxidized asphalt, solvent deasphalted asphalt and natural asphalt.

[0014] Based on the weight of the polymer modifier, SBS accounts for 90% to 97% and the monomer compound accounts for 3% to 10%, preferably SBS accounts for 94% to 96% and the monomer compound accounts for 4% to 6%.

[0015] The SBS refers to a styrene-butadiene-styrene copolymer, and its molecular weight is 60,000 to 120,000. The mass content of styrene in the styrene-butadiene-styrene copolymer is 30% to 40%.

[0016] The SBS undergoes a grafting reaction with a monomer compound under the action of an initiator to form a polymer modifier.

[0017] The initiator is one or more of benzoyl peroxide (BPO), azobisisobutyronitrile (AIBN), didodecanoyl peroxide, di-tert-butyl peroxide, tert-butyl peroxyethyl ester, and tert-butyl peroxyethyl ester.

[0018] Based on the weight of the polymer modifier, the added amount of the initiator is 0.1% to 0.5% by weight of the polymer modifier, preferably 0.2% to 0.4% by weight.

[0019] The monomer compound is a piperidine compound, preferably a piperidine compound containing a double bond, and further preferably one or more of 1,2-dimethyl-5-methylenepiperidine, 2,2,6,6-tetramethyl-4-piperidinyl methacrylate, 1-ethyl-3-piperidinyl methacrylate, 1-acetyl-4-methylenepiperidine, and 1-ethyl-3-methylenepiperidine.

[0020] The vulcanizing agent is one or more of elemental sulfur, peroxide, diaryl disulfide, and phenolic resin, preferably one or more of elemental sulfur and diaryl disulfide.

[0021] The vulcanization accelerator is a thiazole compound, preferably one or more of 2-(p-aminobenzenesulfonylamino)thiazole, zinc mercaptobenzothiazole, and 2-mercaptobenzothiazole.

[0022] The second aspect of the present invention provides a method for preparing the above-mentioned anti-aging modified asphalt composition, comprising the following steps:

[0023] (1) adding SBS modifier and monomer compound into a reaction kettle, heating until SBS is dissolved, adding initiator under protective gas atmosphere, heating to reaction temperature, and carrying out grafting reaction;

[0024] (2) adding a solvent to the polymer colloid obtained after the reaction in step (1) to obtain a precipitate, and drying and extracting the precipitate to obtain a polymer modifier;

[0025] (3) heating the base asphalt, then adding the polymer modifier obtained in step (2) and shearing; adding the vulcanizing agent and the vulcanization accelerator after the first stirring, and reacting under the second stirring to obtain an anti-aging modified asphalt composition.

[0026] In step (1), the reaction kettle can be a four-necked flask.

[0027] In step (1), the SBS dissolution temperature is 40-60°C.

[0028] In step (1), the protective gas is one or more of nitrogen, carbon dioxide and helium.

[0029] In step (1), the reaction temperature is 40-90°C, preferably 60-80°C; the reaction time is 30-70 min, preferably 40-60 min. The reaction is carried out under stirring at a speed of 600-800 r / min.

[0030] In step (2), a solvent is slowly added to the polymer glue obtained after the reaction in step (1) until no more precipitates are precipitated, and then the addition of solvent is stopped.

[0031] In step (2), the solvent is one or more of isopropanol, n-butanol, carbon tetrachloride, and tetrahydrofuran.

[0032] In step (2), the drying is performed under vacuum, and the drying is performed so that the obtained precipitate is dried to a constant weight. Generally speaking, the drying temperature is 60 to 80° C. and the drying time is 4 to 8 hours.

[0033] In step (2), the extraction can be carried out in a Soxhlet extractor. The extraction time is 18 to 24 hours.

[0034] In step (3), the base asphalt is heated to make the base asphalt fluid. The heating temperature of the base asphalt is generally 130-150°C.

[0035] In step (3), the shearing rate is 3000-5000 r / min, preferably 3000-4500 r / min, the shearing time is 20 min-1 h, and the temperature required for shearing is 140-180° C., preferably 140-160° C.

[0036] In step (3), the first stirring conditions are: a stirring speed of 200 to 400 r / min and a stirring time of 20 to 40 min.

[0037] In step (3), the stirring speed of the second stirring is 200-400 r / min. The reaction temperature is 140-180° C., preferably 160-180° C., and the reaction time is 2-4 h.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] (1) The anti-aging modified asphalt composition of the present invention has good compatibility with asphalt, improves the stability of the modified asphalt, and avoids the physical migration and volatilization problems of the antioxidant caused by directly adding the antioxidant. At the same time, the anti-aging modified asphalt composition can effectively inhibit the aging process of asphalt under light and heat conditions, showing excellent anti-aging performance.

[0040] (2) The polymer modifier used in the present invention is an SBS modifier which undergoes a grafting reaction with a monomer compound under the action of an initiator to form a polymer modifier. The monomer compound is grafted to modify the SBS modifier, thereby improving the cohesive strength, tensile strength and degradation difficulty of the modifier, thereby improving the anti-aging stability of the anti-aging modified asphalt composition. DETAILED DESCRIPTION

[0041] The present invention will be further described below in conjunction with the examples, but it should be understood that the protection scope of the present invention is not limited by the examples. In addition, the percentages involved in the present invention, unless otherwise specified, are all mass percentages.

[0042] Example 1

[0043] The monomer compound methacrylate-2,2,6,6-tetramethyl-4-piperidinyl ester and SBS modifier (monomer compound 10wt%, SBS 90wt%) were added to a four-necked flask, heated to 40°C to completely dissolve the SBS, and 0.1% initiator (based on the weight of the obtained polymer modifier) ​​azobisisobutyronitrile was added under nitrogen protection. After heating to 60°C, stirring was continued at a speed of 600r / min and the reaction was carried out for 40min. After the reaction was completed, isopropanol was slowly added to the polymer glue solution and stirred until the precipitate was no longer precipitated. The precipitate was dried to constant weight at 70°C for 5h in vacuum and extracted in a Soxhlet extractor for 18h to obtain a polymer. 100 parts of straight-run asphalt (softening point 47.5°C) were heated to a fluid state at 130°C, 2 parts of polymer modifier were added, and shearing was performed at 140°C and 3000r / min for 40min; after the shearing was completed, 0.4 parts of elemental sulfur as a vulcanizing agent and 0.2 parts of 2-mercaptobenzothiazole as a vulcanization accelerator were added in sequence at a speed of 200r / min and a temperature of 170°C, and stirring was continued for 2h to obtain an anti-aging modified asphalt composition. The properties of the anti-aging modified asphalt composition were analyzed, and the residual penetration ratio was 75.2%, and the thermal storage softening point difference was 1.9°C.

[0044] Example 2

[0045] The monomer compounds 2,2,6,6-tetramethyl-4-piperidinyl methacrylate, 1-ethyl-3-piperidinyl methacrylate (the molar ratio of 2,2,6,6-tetramethyl-4-piperidinyl methacrylate: 1-ethyl-3-piperidinyl methacrylate is 3:1) and SBS modifier (3wt% of monomer compound, 97wt% of SBS) were added to a four-necked flask, and heated to 50°C to completely dissolve the SBS. Under the protection of carbon dioxide, 0.5% (based on the weight of the obtained polymer modifier) ​​of initiator di-tert-butyl peroxide was added. After heating to 70°C, stirring was continued at a speed of 700r / min and the reaction was carried out for 50min. After the reaction was completed, n-butanol was slowly added to the polymer glue solution and stirred sufficiently until the precipitate no longer precipitated. The precipitate was dried to constant weight at 60°C for 6h in vacuum and extracted in a Soxhlet extractor for 21h to obtain a polymer. The asphalt composition was prepared by mixing 100 parts of oxidized asphalt (softening point 63.8℃) at 140℃ until it was in a fluid state, adding 13 parts of polymer modifier, and shearing for 20 minutes at 150℃ and 3750r / min. After the shearing was completed, 0.6 parts of diphenyl disulfide vulcanizer and 0.1 parts of mercaptobenzothiazole zinc vulcanization accelerator were added in sequence at a speed of 300r / min and a temperature of 160℃, and stirring was continued for 3 hours to obtain an anti-aging modified asphalt composition. The properties of the anti-aging modified asphalt composition were analyzed, and the residual penetration ratio was 76.1%, and the thermal storage softening point difference was 1.6℃.

[0046] Example 3

[0047] The monomer compounds 1-acetyl-4-methylenepiperidine, 1-ethyl-3-methylenepiperidine (the molar ratio of 1-acetyl-4-methylenepiperidine: 1-ethyl-3-methylenepiperidine = 2:5) and SBS modifier (monomer compound 5wt%, SBS 95wt%) were added to a four-necked flask, and heated to 60°C to completely dissolve the SBS. 0.3% initiator (based on the weight of the obtained polymer modifier) ​​didodecanol peroxide was added under helium protection. After heating to 80°C, stirring was continued at a speed of 800r / min and the reaction was carried out for 60min. After the reaction was completed, isopropanol was slowly added to the polymer glue solution and stirred until the precipitate was no longer precipitated. The precipitate was dried to constant weight at 80°C for 4h in vacuum and extracted in a Soxhlet extractor for 24h to obtain a polymer. Modifier: 100 parts of solvent deasphalted asphalt (softening point 76.9°C) were heated at 150°C to a fluid state, 5 parts of polymer modifier were added, and shearing was performed at 160°C and 4500r / min for 1h; after the shearing was completed, 0.5 parts of elemental sulfur as a vulcanizing agent and 0.15 parts of 2-(p-aminobenzenesulfonylamino)thiazole as a vulcanizing accelerator were added in sequence at a speed of 400r / min and a temperature of 180°C, and stirring was continued for 4h to obtain an anti-aging modified asphalt composition. The anti-aging modified asphalt composition was analyzed, and the residual penetration ratio was 78%, and the thermal storage softening point difference was 0.2°C.

[0048] Example 4

[0049] The monomer compound 1-ethyl-3-methylenepiperidine and SBS modifier (monomer compound 6wt%, SBS 94wt%) were added to a four-necked flask, heated to 45°C to completely dissolve the SBS, and 0.2% initiator (based on the weight of the obtained polymer modifier) ​​tert-butyl peroxyethyl octanoate was added under nitrogen protection. After heating to 65°C, stirring was continued at a speed of 650r / min and the reaction was carried out for 45min. After the reaction was completed, tetrahydrofuran was slowly added to the polymer glue solution and stirred sufficiently until the precipitate was no longer precipitated. The precipitate was dried to constant weight at 65°C for 4h in vacuum and extracted in a Soxhlet extractor for 19h to obtain a polymer. Modifier: 100 parts of straight-run asphalt (softening point 50°C) were heated to a fluid state at 135°C, 3 parts of polymer modifier were added, and shearing was performed at 145°C and 3500r / min for 25 minutes; after the shearing was completed, 0.1 parts of vulcanizing agent 4,4'-diaminodiphenyl disulfide and 0.05 parts of vulcanization accelerator mercaptobenzothiazole zinc were added in sequence at a speed of 250r / min and a temperature of 165°C for 35 minutes, and stirring was continued for 3 hours to obtain an anti-aging modified asphalt composition. The properties of the anti-aging modified asphalt composition were analyzed, and the residual penetration ratio was 77%, and the thermal storage softening point difference was 0.8°C.

[0050] Example 5

[0051] In a four-necked flask, monomer compounds 1-ethyl-3-piperidinyl methacrylate, 1-ethyl-3-methylenepiperidine (1-ethyl-3-piperidinyl methacrylate: 1-ethyl-3-methylenepiperidine molar ratio = 3:2) and SBS modifier (monomer compound 4wt%, SBS 96wt%) were added, and heated to 75°C to completely dissolve the SBS. Under the protection of carbon dioxide, 0.4% initiator (based on the weight of the obtained polymer modifier) ​​benzoyl peroxide was added. After heating to 60°C, stirring was continued at a speed of 750r / min and the reaction was carried out for 55min. After the reaction was completed, carbon tetrachloride was slowly added to the polymer glue solution, and the mixture was fully stirred until the precipitate no longer precipitated. The precipitate was dried to constant weight at 75°C for 5h in vacuum, and extracted in a Soxhlet extractor for 20h to obtain a polymer. Modifier: 100 parts of straight-run asphalt (softening point 51.9°C) were heated to a fluid state at 145°C, 6 parts of polymer modifier were added, and shearing was performed at 155°C and 4000r / min for 40min; after the shearing was completed, 1 part of vulcanizing agent 4,4'-dihydroxydiphenyl sulfide and 0.3 parts of vulcanization accelerator 2-mercaptobenzothiazole were added in sequence at a speed of 300r / min and a temperature of 175°C for 30min, and stirring was continued for 4h to obtain an anti-aging modified asphalt composition. The anti-aging modified asphalt composition was analyzed, and the residual penetration ratio was 77.4%, and the thermal storage softening point difference was 0.6°C.

[0052] Example 6

[0053] The monomer compounds 1,2-dimethyl-5-methylenepiperidine, 1-ethyl-3-methylenepiperidine (1,2-dimethyl-5-methylenepiperidine: 1-ethyl-3-methylenepiperidine molar ratio = 1:4) and SBS modifier (monomer compound 12wt%, SBS 88wt%) were added to a four-necked flask, heated to 40°C to completely dissolve the SBS, and 0.4% initiator (based on the weight of the obtained polymer modifier) ​​tert-butyl peroxyethyl octanoate was added under nitrogen protection. After heating to 60°C, stirring was continued at a speed of 700r / min and the reaction was carried out for 60min. After the reaction was completed, n-butanol was slowly added to the polymer glue solution and stirred until the precipitate was no longer precipitated. The precipitate was dried to constant weight at 70°C for 5h in vacuum and extracted in a Soxhlet extractor for 22h to obtain a polymer modified agent; 100 parts of straight-run asphalt (softening point 51.9℃) were heated to a fluid state at 150℃, 13 parts of polymer modifier were added, and shearing was performed at 160℃ and 4500r / min for 50min; after the shearing was completed, 0.3 parts of vulcanizing agent 4,4'-dinitrodiphenyl disulfide and 0.2 parts of vulcanization accelerator mercaptobenzothiazole zinc were added in sequence at a speed of 350r / min and a temperature of 180℃ for 40min, and stirring was continued for 2h to obtain an anti-aging modified asphalt composition. The properties of the anti-aging modified asphalt composition were analyzed, and the residual penetration ratio was 74%, and the thermal storage softening point difference was 2.0℃.

[0054] Example 7

[0055] The monomer compounds methacrylate-2,2,6,6-tetramethyl-4-piperidinyl ester, 1-acetyl-4-methylenepiperidine (methacrylate-2,2,6,6-tetramethyl-4-piperidinyl ester: 1-acetyl-4-methylenepiperidine molar ratio = 5:2) and SBS modifier (monomer compound 2wt%, SBS 98wt%) were added to a four-necked flask, heated to 60°C to completely dissolve the SBS, and 0.2% initiator (based on the weight of the obtained polymer modifier) ​​was added under helium protection. After heating to 70°C, stirring was continued at a speed of 600r / min and the reaction was carried out for 50min. After the reaction was completed, carbon tetrachloride was slowly added to the polymer glue solution and stirred until the precipitate was no longer precipitated. The precipitate was dried to constant weight at 80°C for 4h in vacuum and extracted in a Soxhlet extractor for 23h to obtain a polymer modified agent; 100 parts of solvent deasphalted asphalt (softening point 76.9℃) were heated at 140℃ to a fluid state, 1 part of polymer modifier was added, and shearing was performed at 150℃ and 3500r / min for 40min; after the shearing was completed, 0.7 parts of diphenyl disulfide, a vulcanizing agent, and 0.15 parts of 2-(p-aminobenzenesulfonylamino)thiazole, a vulcanization accelerator, were added in sequence at a speed of 400r / min and a temperature of 180℃, and stirring was continued for 4h to obtain an anti-aging modified asphalt composition. The properties of the anti-aging modified asphalt composition were analyzed, and the residual penetration ratio was 74.8%, and the thermal storage softening point difference was 1.9℃.

[0056] Comparative Example 1

[0057] 100 parts of solvent deasphalted (softening point 76.9°C) were heated to a fluid state at 150°C, 5 parts of SBS polymer were added, and sheared at 160°C and 4500r / min for 1h; after the shearing was completed, 0.5 parts of elemental sulfur as a vulcanizing agent and 0.15 parts of 2-mercaptobenzothiazole as a vulcanization accelerator were added in sequence at a speed of 400r / min and a temperature of 180°C, and stirring was continued for 4h to obtain a modified asphalt composition. The properties of the modified asphalt composition were analyzed, and the residual penetration ratio was 71%, and the thermal storage softening point difference was 2.5°C.

[0058] Comparative Example 2

[0059] 100 parts of solvent deasphalted (softening point 76.9°C) were heated to a fluid state at 150°C, 5 parts of a mechanical mixture of SBS polymer and monomer compound (monomer compound 5wt%, SBS 95wt%) were added, and sheared at 160°C and 4500r / min for 1h; after the shearing was completed, 0.5 parts of sulfur as a vulcanizing agent and 0.15 parts of 2-(p-aminobenzenesulfonylamino)thiazole as a vulcanizing accelerator were added in sequence at a speed of 400r / min and a temperature of 180°C, and stirring was continued for 4h to obtain a modified asphalt composition. The properties of the modified asphalt composition were analyzed, and the residual penetration ratio was 70.3%, and the thermal storage softening point difference was 2.6°C.

[0060] By comparing the above examples with the comparative examples, it is found that the anti-aging modified asphalt composition of the present invention improves the anti-aging performance of asphalt and increases the compatibility with the base asphalt. At the same time, the preparation method of the anti-aging modified asphalt composition provided by the present invention has the characteristics of simple production process, easy control of reaction temperature, sufficient reaction, low production cost, stable product quality, and large-scale production.

Claims

1. An anti-aging modified asphalt composition, characterized in that: By weight, it includes the following components: 100 parts of base asphalt; 2 to 13 parts of polymer modifier, preferably 3 to 6 parts; Vulcanizing agent 0.1-1 part; Vulcanization accelerator 0.01-0.3 parts; The polymer modifier includes SBS and a monomer compound.

2. The anti-aging modified asphalt composition according to claim 1, characterized in that: The softening point of the matrix asphalt is 40-80° C.; the matrix asphalt is selected from one or more of straight-run asphalt, oxidized asphalt, solvent deasphalted asphalt, and natural asphalt.

3. The anti-aging modified asphalt composition according to claim 1, characterized in that: Based on the weight of the polymer modifier, SBS accounts for 90% to 97% and the monomer compound accounts for 3% to 10%, preferably SBS accounts for 94% to 96% and the monomer compound accounts for 4% to 6%.

4. The anti-aging modified asphalt composition according to claim 1, characterized in that: The SBS undergoes a grafting reaction with a monomer compound under the action of an initiator to form a polymer modifier.

5. The anti-aging modified asphalt composition according to claim 4, characterized in that: The initiator is one or more of benzoyl peroxide, azobisisobutyronitrile, didodecanoyl peroxide, di-tert-butyl peroxide, tert-butyl peroxyethyl ester, and tert-butyl peroxyethyl ester.

6. The anti-aging modified asphalt composition according to claim 4 or 5, characterized in that: Based on the weight of the polymer modifier, the added amount of the initiator is 0.1% to 0.5% by weight of the polymer modifier, preferably 0.2% to 0.4% by weight.

7. The anti-aging modified asphalt composition according to claim 1, characterized in that: The monomer compound is a piperidine compound, preferably a piperidine compound containing a double bond, and further preferably one or more of 1,2-dimethyl-5-methylenepiperidine, 2,2,6,6-tetramethyl-4-piperidinyl methacrylate, 1-ethyl-3-piperidinyl methacrylate, 1-acetyl-4-methylenepiperidine, and 1-ethyl-3-methylenepiperidine.

8. The anti-aging modified asphalt composition according to claim 1, characterized in that: The vulcanizing agent is one or more of elemental sulfur, peroxide, diaryl disulfide, and phenolic resin, preferably one or more of elemental sulfur and diaryl disulfide.

9. The anti-aging modified asphalt composition according to claim 1, characterized in that: The vulcanization accelerator is a thiazole compound, preferably one or more of 2-(p-aminobenzenesulfonylamino)thiazole, zinc mercaptobenzothiazole, and 2-mercaptobenzothiazole.

10. A method for preparing the anti-aging modified asphalt composition according to any one of claims 1 to 9, comprising the following steps: (1) adding SBS and monomer compounds into a reaction kettle, heating until SBS is dissolved, adding an initiator under a protective gas atmosphere, heating to a reaction temperature, and performing a grafting reaction; (2) adding a solvent to the polymer colloid obtained after the reaction in step (1) to obtain a precipitate, and drying and extracting the precipitate to obtain a polymer modifier; (3) heating the base asphalt, then adding the polymer modifier obtained in step (2) and shearing; adding the vulcanizing agent and the vulcanization accelerator after the first stirring, and reacting under the second stirring to obtain an anti-aging modified asphalt composition.

11. The method according to claim 10, characterized in that: In step (1), the SBS dissolution temperature is 40-60°C.

12. The method according to claim 10, characterized in that: In step (1), the reaction temperature is 40-90° C., preferably 60-80° C.; the reaction time is 30-70 min, preferably 40-60 min; the reaction is carried out under stirring at a stirring speed of 600-800 r / min.

13. The method according to claim 10, characterized in that: In step (2), the solvent is one or more of isopropanol, n-butanol, carbon tetrachloride, and tetrahydrofuran.

14. The method according to claim 10, characterized in that: In step (2), the drying temperature is 60 to 80° C. and the drying time is 4 to 8 hours.

15. The method according to claim 10, characterized in that: In step (3), the shearing rate is 3000-5000 r / min, preferably 3000-4500 r / min, the shearing time is 20 min-1 h, and the temperature required for shearing is 140-180° C., preferably 140-160° C.

16. The method according to claim 10, characterized in that: In step (3), the first stirring conditions are: a stirring speed of 200 to 400 r / min and a stirring time of 20 to 40 min.

17. The method according to claim 10, characterized in that: In step (3), the stirring speed of the second stirring is 200-400 r / min; the reaction temperature is 140-180° C., preferably 160-180° C., and the reaction time is 2-4 h.