An anti-aging modified asphalt composition and its preparation method

Abstract

This invention discloses an anti-aging modified asphalt composition and its preparation method. The anti-aging modified asphalt composition, by weight, comprises the following components: 100 parts base asphalt; 2-13 parts polymer modifier; 0.1-1 parts vulcanizing agent; and 0.01-0.3 parts vulcanization accelerator. The polymer modifier includes SBS and monomeric compounds. The anti-aging modified asphalt composition of this invention can effectively inhibit the aging process of asphalt under photothermal conditions, and does not cause physical migration or volatilization of the anti-aging agent. Simultaneously, the asphalt and additives have good compatibility, making the modified asphalt less prone to rutting at high temperatures and less prone to freezing and cracking at low temperatures.

Description

TECHNICAL FIELD

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

[0002] With the development of economy, the traffic volume increases rapidly, and the high-grade highway develops rapidly. High-grade highways need to be equipped with high-performance asphalt, but petroleum asphalt has large temperature sensitivity, high-temperature flow, low-temperature brittleness, and cannot fully meet the requirements of high-grade highways. In order to overcome the above shortcomings of petroleum asphalt, modified asphalt has been widely valued by people. Modified asphalt is obtained by adding a certain amount of modifier to asphalt, so that the temperature sensitivity, stability, durability, adhesion and anti-aging of the asphalt are comprehensively improved. Among the many modifiers, the most widely used and researched is the polymer modifier. Among the polymer modifiers, SBS (styrene-butadiene-styrene block copolymer) is widely used due to its excellent tensile properties, good low-temperature resistance, solubility and unique anti-skid properties.

[0003] At present, modified asphalt is widely used in the paving of asphalt pavement due to its excellent high and low temperature performance, but it is easy to be affected by heat, light, oxygen and other factors during construction and service, resulting in thermal oxidation and ultraviolet aging, which greatly reduces the service life of asphalt pavement. In order to overcome this problem, various anti-aging modified asphalts have been developed by those skilled in the art, but the effects are mostly unsatisfactory.

[0004] CN109401348A discloses an anti-aging modified asphalt, which heats and melts the base asphalt, then adds aliphatic polyurethane resin and SBS asphalt modifier for heat preservation and swelling to improve the fluidity and anti-aging performance of the asphalt. CN111471308A discloses an anti-aging modified asphalt and a preparation method thereof. The method uses a peeling assembly method, first peels the layered manganese dioxide to obtain manganese dioxide nanosheets, then adds alkylammonium cations (dioctadecyldimethylammonium chloride) to react and assemble to obtain a supramolecular intercalation structure, which is then peeled off during the mixing process with SBS rubber to generate nanosheets uniformly dispersed in the base asphalt, showing ultraviolet shielding effect. CN111607242A discloses an anti-aging modified asphalt composition, 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 anti-aging agent, 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 less than 400 nm.

[0005] In summary, the prior art generally adopts the method of adding anti-aging agent in asphalt to inhibit the aging of asphalt material, but if the anti-aging agent is simply added to the asphalt, the anti-aging agent and the asphalt will be separated and layered, and the anti-aging agent will physically migrate and volatilize, which can inhibit the aging of the asphalt to a certain extent, but the anti-aging performance is limited. In addition, due to the large difference in composition and structure between SBS and asphalt, it is difficult to form a stable system during blending, and SBS and asphalt are prone to phase separation during heat storage. Therefore, it is urgent to develop a new anti-aging asphalt composition and a preparation method thereof. SUMMARY

[0006] In view of the deficiencies and shortcomings of the prior art, the present application provides an anti-aging modified asphalt composition and a preparation method thereof. The anti-aging modified asphalt composition of the present application can effectively inhibit the aging process of asphalt under light and heat conditions, and the physical migration and volatilization of the anti-aging agent will not occur, and the asphalt and the additive have good compatibility, so that the modified asphalt is not prone to rutting at high temperature and is not prone to freezing at low temperature.

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

[0008] 100 parts of base asphalt;

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

[0010] 0.1-1 parts of a vulcanizing agent;

[0011] 0.01-0.3 parts of a vulcanization accelerator;

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

[0013] The softening point of the base asphalt is 40-80℃. The base 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%-97% and the monomer compound accounts for 3%-10%, preferably SBS accounts for 94%-96% and the monomer compound accounts for 4%-6%.

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

[0016] The SBS is grafted with the 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), peroxydicarbonic acid dilauryl, peroxydicarbonic acid ditert-butyl, tert-butyl peroxyisooctanoate, tert-butyl peroxyisooctanoate.

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

[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-methylene piperidine, 2,2,6,6-tetramethyl-4-piperidinyl methyl methacrylate, 1-ethyl-3-piperidinyl methacrylate, 1-acetyl-4-methylene piperidine, 1-ethyl-3-methylene piperidine.

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

[0021] The vulcanization accelerator is one or more of thiazole compounds, preferably one or more of 2-(p-aminobenzenesulfonamido)thiazole, zinc mercaptobenzothiazole, 2-mercaptobenzothiazole.

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

[0023] (1) adding the SBS modifier and the monomer compound into a reaction kettle, heating to dissolve the SBS, adding the initiator in a protective atmosphere, heating to the reaction temperature, and performing grafting reaction;

[0024] (2) adding a solvent to the polymer glue obtained after the reaction in step (1) to obtain a precipitate, drying and extracting the precipitate to obtain the 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 performing reaction under the second stirring to obtain the 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 to 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℃, preferably 60-80℃; the reaction time is 30-70min, preferably 40-60min. The reaction is carried out under stirring, and the stirring speed is 600-800r / min.

[0030] In step (2), the solvent is slowly added into the polymer glue solution obtained after the reaction in step (1) until no precipitate is formed, and the addition of the solvent is stopped.

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

[0032] In step (2), the drying is carried out under vacuum, and the drying is carried out until the obtained precipitate is dried to a constant weight. Generally, the drying temperature is 60-80℃, and the drying time is 4-8h.

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

[0034] In step (3), the heating of the matrix asphalt is to make the matrix asphalt in a flow state. The heating temperature of the matrix asphalt is generally 130-150℃.

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

[0036] In step (3), the first stirring is carried out at a speed of 200-400r / min for 20-40min.

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

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

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

[0040] (2) The polymer modifier used in the present application is a SBS modifier which is grafted with monomer compound under the action of initiator to form a polymer modifier, the monomer compound grafts and modifies the SBS modifier, the cohesive strength, tensile strength and degradation difficulty of the modifier are improved, and the anti-aging stability of the anti-aging modified asphalt composition is improved. DETAILED DESCRIPTION

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

[0042] Example 1

[0043] A four-necked flask was charged with monomer compound 2,2,6,6-tetramethyl-4-piperidyl methacrylate and SBS modifier (10wt% monomer compound, 90wt% SBS), heated to 40℃ to completely dissolve the SBS, and then 0.1% initiator (azo-bis-isobutyronitrile, based on the weight of the obtained polymer modifier) was added under nitrogen protection. After heating to 60℃, continuous stirring was carried out at a rotation speed of 600r / min for 40min. After the reaction was completed, isopropyl alcohol was slowly added to the polymer glue solution, and the mixture was stirred until no precipitate was formed. The precipitate was dried to constant weight in a vacuum at 70℃ for 5h, and then extracted in a Soxhlet extractor for 18h to obtain the polymer modifier. 100 parts of straight-run asphalt (softening point 47.5℃) was heated to a flowable state at 130℃, and then 2 parts of the polymer modifier was added. The mixture was sheared at 140℃ and a rotation speed of 3000r / min for 40min. After shearing, 0.4 parts of sulfur and 0.2 parts of 2-mercaptobenzothiazole were added to the mixture, which was then stirred at a rotation speed of 200r / min and a temperature of 170℃ for 40min. The mixture was then continuously stirred 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 difference in softening point after heat storage was 1.9℃.

[0044] Example 2

[0045] In a four-necked flask, monomer compound methyl methacrylate-2,2,6,6-tetramethyl-4- piperidyl ester, 1-ethyl-3-piperidyl methacrylate (molar ratio of methyl methacrylate-2,2,6,6-tetramethyl-4-piperidyl ester: 1-ethyl-3-piperidyl methacrylate = 3:1) and SBS modifier (monomer compound 3wt%, SBS 97wt%) were added, heated to 50°C to completely dissolve SBS, 0.5% (based on the weight of the resulting polymer modifier) initiator di-t-butyl peroxide was added under carbon dioxide protection, after heating to 70°C, continuous stirring was carried out at a rotation 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 the precipitate was fully stirred until no more precipitate was precipitated, the precipitate was dried to constant weight under vacuum at 60°C for 6h, and was extracted in a Soxhlet extractor for 21h to obtain the polymer modifier; 100 parts of oxidized asphalt (softening point 63.8°C) was heated to a flowable state at 140°C, 13 parts of the polymer modifier was added, and shearing was carried out at 150°C and a rotation speed of 3750r / min for 20min; after the shearing was completed, stirring was carried out at a rotation speed of 300r / min and a temperature of 160°C for 20min, then curing agent diphenyl disulfide 0.6 parts and curing accelerator mercapto benzothiazole zinc 0.1 parts were sequentially added, and stirring was continued for 3h 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 hot storage softening point difference was 1.6°C.

[0046] Example 3

[0047] In a four-necked flask, monomer compound 1-acetyl-4-methylene piperidine, 1-ethyl-3-methylene piperidine (molar ratio of 1-acetyl-4-methylene piperidine: 1-ethyl-3-methylene piperidine = 2:5) and SBS modifier (5 wt% of monomer compound, 95 wt% of SBS) were added, heated to 60°C to completely dissolve SBS, 0.3% initiator (based on the weight of the resulting polymer modifier) peroxide was added under helium protection, heated to 80°C, and then continuously stirred at a speed of 800 r / min for 60 min; after the reaction was completed, isopropyl alcohol was slowly added to the polymer glue solution, and the precipitate was fully stirred until no more precipitate was precipitated. The precipitate was dried to constant weight at 80°C under vacuum for 4 h, extracted in a Soxhlet extractor for 24 h, and then a polymer modifier was obtained. 100 parts of solvent deasphalted (softening point 76.9°C) were heated to a flow state at 150°C, 5 parts of the polymer modifier were added, and shearing was carried out at 160°C and a speed of 4500 r / min for 1 h. After shearing, 0.5 parts of sulfurizing agent elemental sulfur and 0.15 parts of sulfurizing accelerator 2-(p-aminobenzenesulfonamido) thiazole were added in sequence under stirring at a speed of 400 r / min and a temperature of 180°C for 30 min, and then stirring was continued for 4 h to obtain an anti-aging modified asphalt composition. Analysis of the anti-aging modified asphalt composition showed that the residual penetration ratio was 78%, and the hot storage softening point difference was 0.2°C.

[0048] Example 4

[0049] In a four-necked flask, monomer compound 1-acetyl-4-methylene piperidine, 1-ethyl-3-methylene piperidine (molar ratio of 1-acetyl-4-methylene piperidine: 1-ethyl-3-methylene piperidine = 2:5) and SBS modifier (5 wt% of monomer compound, 95 wt% of SBS) were added, heated to 60°C to completely dissolve SBS, 0.3% initiator (based on the weight of the resulting polymer modifier) peroxide was added under helium protection, heated to 80°C, and then continuously stirred at a speed of 800 r / min for 60 min; after the reaction was completed, isopropyl alcohol was slowly added to the polymer glue solution, and the precipitate was fully stirred until no more precipitate was precipitated. The precipitate was dried to constant weight at 80°C under vacuum for 4 h, extracted in a Soxhlet extractor for 24 h, and then a polymer modifier was obtained. 100 parts of solvent deasphalted (softening point 76.9°C) were heated to a flow state at 150°C, 5 parts of the polymer modifier were added, and shearing was carried out at 160°C and a speed of 4500 r / min for 1 h. After shearing, 0.5 parts of sulfurizing agent elemental sulfur and 0.15 parts of sulfurizing accelerator 2-(p-aminobenzenesulfonamido) thiazole were added in sequence under stirring at a speed of 400 r / min and a temperature of 180°C for 30 min, and then stirring was continued for 4 h to obtain an anti-aging modified asphalt composition. Analysis of the anti-aging modified asphalt composition showed that the residual penetration ratio was 78%, and the hot storage softening point difference was 0.2°C.

[0050] Example 5

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

[0052] Example 6

[0053] In a four-necked flask, monomer compound 1,2-dimethyl-5-methylene piperidine, 1-ethyl-3-methylene piperidine (molar ratio of 1,2-dimethyl-5-methylene piperidine: 1-ethyl-3-methylene piperidine = 1:4) and SBS modifier (12wt% of monomer compound, 88wt% of SBS) were added, heated to 40°C to completely dissolve SBS, 0.4% initiator (based on the weight of the obtained polymer modifier) tert-butyl peroxy isooctanoate was added under nitrogen protection, after heated to 60°C, continuous stirring was carried out at a rotation 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 the precipitate was fully stirred until no more precipitate was precipitated, the precipitate was dried to constant weight under vacuum at 70°C for 5h, and was extracted in a Soxhlet extractor for 22h to obtain the polymer modifier; 100 parts of straight-run asphalt (softening point 51.9°C) was heated to a flowable state at 150°C, 13 parts of the polymer modifier was added, and shearing was carried out at 160°C and a rotation speed of 4500r / min for 50min; after the shearing was completed, stirring was carried out at a rotation speed of 350r / min and a temperature of 180°C for 40min, then 0.3 parts of vulcanizing agent 4,4'-dinitrodiphenyl disulfide and 0.2 parts of vulcanizing accelerator mercaptobenzothiazole zinc were added in sequence, and the stirring was continued for 2h to obtain the 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 hot storage softening point difference was 2.0°C.

[0054] Example 7

[0055] In a four-necked flask, monomer compound methyl methacrylate-2,2,6,6-tetramethyl-4-piperidyl ester, 1-acetyl-4-methylene piperidine (molar ratio of methyl methacrylate-2,2,6,6-tetramethyl-4-piperidyl ester: 1-acetyl-4-methylene piperidine = 5:2) and SBS modifier (monomer compound 2 wt%, SBS 98 wt%) were added, heated to 60°C to completely dissolve SBS, 0.2% initiator (based on the weight of the resulting polymer modifier) peroxide was added under helium protection, heated to 70°C, and stirred at a speed of 600 r / min for 50 min; after the reaction was completed, carbon tetrachloride was slowly added to the polymer glue solution, and the precipitate was stirred until no more precipitate was precipitated. The precipitate was dried to constant weight in a vacuum at 80°C for 4 h, and extracted in a Soxhlet extractor for 23 h to obtain a polymer modifier; 100 parts of solvent deasphalted oil (softening point 76.9°C) were heated to a flowable state at 140°C, 1 part of the polymer modifier was added, and sheared at 150°C and a speed of 3500 r / min for 40 min; after shearing, 0.7 parts of curing agent diphenyl disulfide and 0.15 parts of curing accelerator 2-(p-aminobenzenesulfonamido) thiazole were added in sequence at a speed of 400 r / min and a temperature of 180°C, and stirred for 4 h 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 hot storage softening point difference was 1.9°C.

[0056] Comparative Example 1

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

[0058] Comparative Example 2

[0059] 100 parts of solvent deasphalted bitumen (softening point 76.9°C) was heated to a flowable state at 150°C, 5 parts of a mechanical mixture of SBS polymer and monomer compound (monomer compound 5wt%, SBS 95wt%) was added, and sheared at 160°C and 4500r / min for 1h; after shearing, 0.5 parts of sulfur as vulcanizing agent and 0.15 parts of 2-(p-aminobenzenesulfonamido)thiazole as vulcanizing accelerator were added in turn after stirring at 400r / min and 180°C for 30min, and the stirring was continued for 4h to obtain a modified bitumen composition. The properties of the modified bitumen composition were analyzed, and the residual penetration ratio was 70.3% and the difference in hot storage softening point was 2.6°C.

[0060] Comparing the above examples and comparative examples, it is found that the anti-aging modified bitumen composition of the present application improves the anti-aging performance of bitumen while increasing the compatibility with base bitumen. Meanwhile, the anti-aging modified bitumen composition provided by the present application 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 bitumen composition characterized in that: The following components are included by weight parts: 100 parts of base asphalt; 2-13 parts of polymer modifier; 0.1-1 part of vulcanizing agent; 0.01-0.3 part of vulcanization accelerator; The polymer modifier includes SBS and monomer compound; SBS accounts for 90%-97% and monomer compound accounts for 3%-10% based on the weight of the polymer modifier; The SBS and monomer compound are grafted under the action of initiator to form the polymer modifier; The monomer compound is one or more of 1,2-dimethyl-5-methylene piperidine, methyl methacrylate-2,2,6,6-tetramethyl-4-piperidyl ester, 1-ethyl-3-piperidyl methacrylate, 1-acetyl-4-methylene piperidine, 1-ethyl-3-methylene piperidine.

2. The anti-aging modified bitumen composition of claim 1, wherein: The polymer modifier is 3-6 parts by weight.

3. The anti-aging modified bitumen composition of claim 1, wherein: The softening point of the base asphalt is 40-80℃; the base asphalt is selected from one or more of straight-run asphalt, oxidized asphalt, solvent deasphalted asphalt, and natural asphalt.

4. The anti-aging modified bitumen composition of claim 1 or 2, wherein: SBS accounts for 94%-96% and monomer compound accounts for 4%-6% based on the weight of the polymer modifier.

5. The anti-aging modified bitumen composition of claim 1, wherein: The initiator is one or more of benzoyl peroxide, azobisisobutyronitrile, peroxy dilauryl, peroxy ditert-butyl, and tert-butyl peroxy isooctanoate.

6. The anti-aging modified bitumen composition of claim 1 or 5, wherein: The amount of initiator added is 0.1%-0.5% of the weight of the polymer modifier based on the weight of the polymer modifier.

7. The anti-aging modified bitumen composition of claim 6, wherein: The amount of initiator added is 0.2%-0.4% of the weight of the polymer modifier based on the weight of the polymer modifier.

8. The anti-aging modified bitumen composition of claim 1, wherein: The vulcanizing agent is one or more of elemental sulfur, peroxide, diaryl disulfide, and phenolic resin.

9. The anti-aging modified bitumen composition of claim 8, wherein: The vulcanizing agent is one or more of elemental sulfur and diaryl disulfide.

10. The anti-aging modified bitumen composition of claim 1, wherein: The vulcanization accelerator is a thiazole compound.

11. The anti-aging modified bitumen composition of claim 10, wherein: The vulcanization accelerator is one or more of 2-(p-aminobenzenesulfonamido)thiazole, zinc mercaptobenzothiazole, and 2-mercaptobenzothiazole.

12. A method for preparing the anti-aging modified asphalt composition according to any one of claims 1-11, comprising the following steps: (1) adding SBS and monomer compound into a reaction kettle, heating to dissolve the SBS, adding initiator under a protective atmosphere, heating to reaction temperature, and performing grafting reaction; (2) adding solvent to the polymer glue obtained after step (1) to obtain precipitate, drying and extracting the precipitate to obtain polymer modifier; (3) heating base asphalt, then adding the polymer modifier obtained in step (2), and shearing; adding vulcanizing agent and vulcanization accelerator after first stirring, and performing reaction under second stirring to obtain anti-aging modified asphalt composition.

13. The method of claim 12, wherein: In step (1), the SBS dissolving temperature is 40-60℃.

14. The method of claim 12, wherein: In step (1), the reaction temperature is 40-90℃, and the reaction time is 30-70 min; the reaction is performed under stirring at a stirring speed of 600-800 r / min.

15. The method of claim 14, wherein: In step (1), the reaction temperature is 60-80℃, and the reaction time is 40-60 min.

16. The method of claim 12, wherein: In step (2), the solvent is one or more of isopropyl alcohol, n-butanol, carbon tetrachloride, and tetrahydrofuran.

17. The method of claim 12, wherein: In step (2), the drying temperature is 60-80℃, and the drying time is 4-8h.

18. The method of claim 12, wherein: In step (3), the shearing rate is 3000-5000 r / min, the shearing time is 20 min-1h, and the shearing temperature is 140-180℃.

19. The method of claim 18, wherein: In step (3), the shearing rate is 3000-4500 r / min, and the shearing temperature is 140-160℃.

20. The method of claim 12, wherein: In step (3), the first stirring condition is that the stirring speed is 200-400 r / min, and the stirring time is 20-40 min.

21. The method of claim 12, wherein: In step (3), the second stirring speed is 200-400 r / min, the reaction temperature is 140-180℃, and the reaction time is 2-4h.

22. The method of claim 12, wherein: In step (3), the reaction temperature is 160-180℃.