Highly viscous and highly elastic asphalt and method for preparing the same

Abstract

This invention discloses a high-viscosity, high-elasticity asphalt and its preparation method, relating to the field of asphalt material technology. The high-viscosity, high-elasticity asphalt comprises the following raw materials in parts by weight: 100 parts base asphalt, 5-8 parts tackifier, 2-3 parts nano-montmorillonite, 1.5-3 parts graphene oxide, 8-12 parts modified SBS, 0.5-1.2 parts anti-aging agent, and 0.1-0.3 parts crosslinking agent. The high-viscosity, high-elasticity asphalt prepared by this invention exhibits good elastic recovery rate and anti-aging properties.

Description

Technical Field

[0001] This invention relates to the field of asphalt materials technology, specifically to a high-viscosity, high-elasticity asphalt and its preparation method. Background Technology

[0002] With the rapid development of modern transportation infrastructure, the performance requirements for road materials are becoming increasingly stringent. Although traditional asphalt materials are widely used in road construction, their performance limitations are gradually becoming apparent when faced with complex working conditions and extreme environments. For example, ordinary asphalt is prone to softening at high temperatures, leading to rutting; and it is prone to embrittlement at low temperatures, causing road surface cracking. In addition, ordinary asphalt lacks sufficient adhesion and elasticity, making it difficult to meet the needs of heavy traffic, frequent vibration, and complex climatic conditions.

[0003] In recent years, to overcome the shortcomings of traditional asphalt, researchers have developed various modified asphalt technologies, such as adding polymers (e.g., SBS, EVA) to improve the viscoelastic properties of asphalt. However, existing modified asphalt technologies still have some problems: on the one hand, some modified asphalts do not perform well in terms of high-temperature stability or low-temperature toughness, and cannot fully meet the needs of practical engineering; on the other hand, some modification methods are complex and costly, limiting their large-scale application.

[0004] Furthermore, with increasingly stringent environmental protection requirements, higher demands are being placed on the durability and anti-aging properties of asphalt materials. Traditional modified asphalt is prone to aging and spalling during long-term use, leading to a decline in pavement performance and increased maintenance costs.

[0005] Chinese invention patent CN101560332A discloses a high-viscosity, high-elasticity asphalt and its preparation method. This high-viscosity, high-elasticity asphalt is composed of 50-92 parts by weight of asphalt matrix, 8-40 parts by weight of additives, and 0.1-12 parts by weight of crosslinking agent. The additives are rubber powder and styrene-butadiene-styrene block copolymer. This high-viscosity, high-elasticity asphalt exhibits excellent dynamic shear viscosity, but its anti-aging properties are poor. Therefore, developing an asphalt material that combines high adhesion, high elasticity, and excellent durability has become a research hotspot in the field of road materials. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a high-viscosity, high-elasticity asphalt and its preparation method.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A high-viscosity, high-elasticity asphalt comprises the following raw materials in parts by weight:

[0009] The composition includes 100 parts base asphalt, 5-8 parts tackifier, 2-3 parts nano-montmorillonite, 1.5-3 parts graphene oxide, 8-12 parts modified SBS, 0.5-1.2 parts anti-aging agent, and 0.1-0.3 parts crosslinking agent.

[0010] The modified SBS is prepared by the following method:

[0011] S1: Under nitrogen protection, 1,3-bis((2,2-dimethyl-1,3-dioxapentane-4-yl)methoxy)prop-2-amine reacts with methacryloyl chloride in the presence of triethylamine to form an amide compound;

[0012] S2: Under nitrogen protection, the four-armed polyethylene glycol mercapto group reacts with the amide compound under the action of the initiator AIBN to generate an eight-armed cyclopentane compound, and the eight-armed cyclopentane compound is hydrolyzed to generate an eight-armed hydroxy compound.

[0013] S3: Under nitrogen protection, an octagonal hydroxyl compound reacts with SBS in the presence of catalyst C-94 and 1-butyl-3-methylimidazolium methane sulfonate ionic liquid to obtain modified SBS.

[0014] In step S1, the mass ratio of 1,3-bis((2,2-dimethyl-1,3-dioxapentane-4-yl)methoxy)prop-2-amine to methacryloyl chloride is 3:(2-3).

[0015] In step S2, the mass ratio of the four-arm polyethylene glycol thiol group to the amide compound is (6-8):4.

[0016] In step S3, the mass ratio of the octagonal hydroxyl compound to SBS is 1:(30-40).

[0017] The anti-aging agent is prepared by the following method:

[0018] A1: Oleic acid reacts with formic acid and H2O2 to form an epoxy compound;

[0019] A2: Epoxides form polymers under the action of chromium acetylacetone;

[0020] A3: The polymer reacts with 3-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)-3-hydroxyphenoxy)-2-hydroxypropyl methacrylate to obtain an anti-aging agent.

[0021] In step A1, the mass ratio of oleic acid to formic acid is 16:5.

[0022] In step A2, the mass ratio of epoxy compound to chromium acetylacetone is 50:1.

[0023] In step A3, the mass ratio of the polymer to 3-(4-(4,6-diphenyl-1,3,5-triazine-2-yl)-3-hydroxyphenoxy)-2-hydroxypropyl methacrylate is 6:1.

[0024] The thickener is hydrogenated rosin glycerol ester; the crosslinking agent is sulfur.

[0025] A method for preparing high-viscosity, high-elasticity asphalt includes the following steps:

[0026] (1) Weigh out the following by weight: 100 parts of base asphalt, 5-8 parts of tackifier, 2-3 parts of nano-montmorillonite, 1.5-3 parts of graphene oxide, 8-12 parts of modified SBS, 0.5-1.2 parts of anti-aging agent, and 0.1-0.3 parts of crosslinking agent;

[0027] (2) Heat the base asphalt to 160℃ to melt it, then add the tackifier and shear at 2000rpm for 20min; cool down to 155℃, add modified SBS and anti-aging agent, and shear at 4000rpm for 40min; heat up to 175℃, add crosslinking agent, and react for 30min; add nano montmorillonite and graphene oxide, and shear at 5000rpm for 60min; react at 160℃ for 2h to obtain high viscosity and high elasticity asphalt.

[0028] Due to the adoption of the above technical solutions, the beneficial effects of the present invention include:

[0029] (1) The modified SBS prepared in this invention significantly optimizes the elastic recovery performance of asphalt through the synergistic effect of highly branched structure, polar groups enhancing compatibility, dynamic hydrogen bond network, and flexible segments. This modified SBS not only improves elastic recovery efficiency but also takes into account dispersibility and durability, making it suitable for demanding road engineering scenarios.

[0030] (2) The 4,6-diphenyl-1,3,5-triazine group introduced into the anti-aging agent prepared in this invention is a highly efficient ultraviolet absorption group. Through the conjugated system and rigid planar structure, it can effectively capture ultraviolet rays and inhibit the photo-oxidative degradation of asphalt. In addition, the molecular weight of the anti-aging agent is increased, so that it has both excellent light stability and the advantages of migration resistance and extraction resistance. These characteristics work together to significantly improve the weather resistance, thermo-oxidative aging resistance and low-temperature crack resistance of asphalt, and extend the service life of the road. Detailed Implementation

[0031] The following description, in conjunction with specific embodiments, provides further details, but the present invention is not limited to these embodiments.

[0032] Example 1: Preparation of modified SBS:

[0033] S1: Under nitrogen protection, 400g of dichloromethane, 30g of 1,3-bis((2,2-dimethyl-1,3-dioxapentane-4-yl)methoxy)prop-2-amine, and 18g of triethylamine were added to the reactor and stirred until homogeneous. Under ice bath conditions, 20g of methacryloyl chloride was slowly added dropwise over 20 minutes. After the addition was complete, the mixture was brought to room temperature and reacted for 8 hours. The mixture was then washed three times with saturated sodium chloride solution (200ml each time), and distilled under reduced pressure at 35°C for 2 hours to obtain the amide compound. The reaction equation is shown below:

[0034]

[0035] S2: Under nitrogen protection, 800g DMSO, 60g tetra-arm polyethylene glycol thiol, and 40g amide compound were added to the reactor and stirred until homogeneous. The mixture was heated to 80℃, and then 14g initiator AIBN was added. After reacting for 24h, the mixture was cooled to room temperature and distilled under reduced pressure at 60℃ for 3h. The octa-arm cyclopentane compound was obtained by separation by silica gel column chromatography. 400g deionized water and 80g octa-arm cyclopentane compound were added to the reactor, followed by 100g 15wt% dilute hydrochloric acid. The mixture was stirred until homogeneous, and then heated to reflux for 2h. The pH was adjusted to neutral by adding 10wt% sodium hydroxide solution, and the mixture was distilled under reduced pressure at 60℃ for 3h. The mixture was then dried under vacuum at 60℃ for 5h to obtain the octa-arm hydroxyl compound. The reaction equation is shown below.

[0036]

[0037] S3: Under nitrogen protection, 1500g N,N-dimethylformamide, 10g octa-arm hydroxyl compound, 300g SBS, 20g catalyst C-94, and 8g 1-butyl-3-methylimidazolium methane sulfonate ionic liquid were added sequentially to the reactor. The temperature was raised to 100℃ and reacted for 5h. After cooling to room temperature, 2000g deionized water was added and stirred evenly. The mixture was centrifuged, washed with 500g anhydrous ethanol and then washed with 500g deionized water. The mixture was then vacuum dried at 80℃ for 10h to obtain modified SBS.

[0038] Example 2: Preparation of modified SBS:

[0039] S1: Under nitrogen protection, 400g of dichloromethane, 30g of 1,3-bis((2,2-dimethyl-1,3-dioxapentane-4-yl)methoxy)prop-2-amine and 18g of triethylamine were added to the reactor and stirred until homogeneous. Under ice bath conditions, 25g of methacryloyl chloride was slowly added dropwise over 20 minutes. After the addition was complete, the mixture was brought to room temperature and reacted for 6 hours. The mixture was then washed three times with saturated sodium chloride solution (200ml each time) and distilled under reduced pressure at 35°C for 2 hours to obtain the amide compound.

[0040] S2: Under nitrogen protection, 800g DMSO, 70g tetra-arm polyethylene glycol mercapto, and 40g amide product were added to the reactor and stirred until homogeneous. The mixture was heated to 90℃, and then 14g initiator AIBN was added. After reacting for 22h, the mixture was cooled to room temperature and distilled under reduced pressure at 70℃ for 2h. The eight-arm cyclopentane compound was obtained by separation by silica gel column chromatography. 400g deionized water and 80g eight-arm cyclopentane compound were added to the reactor, and then 100g 15wt% dilute hydrochloric acid was added. The mixture was stirred until homogeneous, and then heated to reflux for 2h. After adjusting the pH to neutral by adding 10wt% sodium hydroxide solution, the mixture was distilled under reduced pressure at 60℃ for 3h and dried under vacuum at 60℃ for 6h to obtain the eight-arm hydroxyl compound.

[0041] S3: Under nitrogen protection, 1500g N,N-dimethylformamide, 10g octa-arm hydroxyl compound, 350g SBS, 20g catalyst C-94, and 8g 1-butyl-3-methylimidazolium methanesulfonate ionic liquid were added sequentially to the reactor. The temperature was raised to 110℃ and reacted for 4 hours. After cooling to room temperature, 2000g deionized water was added and stirred evenly. The mixture was centrifuged, washed with 500g anhydrous ethanol and then washed with 500g deionized water. The mixture was then vacuum dried at 80℃ for 10 hours to obtain modified SBS.

[0042] Example 3: Preparation of modified SBS:

[0043] S1: Under nitrogen protection, 400g of dichloromethane, 30g of 1,3-bis((2,2-dimethyl-1,3-dioxapentane-4-yl)methoxy)prop-2-amine and 18g of triethylamine were added to the reactor and stirred until homogeneous. Under ice bath conditions, 30g of methacryloyl chloride was slowly added dropwise over 20 minutes. After the addition was complete, the mixture was brought to room temperature and reacted for 5 hours. The mixture was then washed three times with saturated sodium chloride solution (200ml each time) and distilled under reduced pressure at 35°C for 2 hours to obtain the amide compound.

[0044] S2: Under nitrogen protection, 800g DMSO, 80g four-arm polyethylene glycol mercapto, and 40g amide product were added to the reactor and stirred until homogeneous. The mixture was heated to 100℃, and then 14g initiator AIBN was added. After reacting for 20h, the mixture was cooled to room temperature and distilled under reduced pressure at 50℃ for 3h. The eight-arm cyclopentane compound was obtained by separation by silica gel column chromatography. 400g deionized water and 80g eight-arm cyclopentane compound were added to the reactor, and then 100g 15wt% dilute hydrochloric acid was added. The mixture was stirred until homogeneous, and then heated to reflux for 2h. After adjusting the pH to neutral by adding 10wt% sodium hydroxide solution, the mixture was distilled under reduced pressure at 60℃ for 3h and dried under vacuum at 70℃ for 5h to obtain the eight-arm hydroxyl compound.

[0045] S3: Under nitrogen protection, 1500g N,N-dimethylformamide, 10g octa-arm hydroxyl compound, 400g SBS, 20g catalyst C-94, and 8g 1-butyl-3-methylimidazolium methanesulfonate ionic liquid were added sequentially to the reactor. The temperature was raised to 120℃ and reacted for 3 hours. After cooling to room temperature, 2000g deionized water was added and stirred evenly. The mixture was centrifuged, washed with 500g anhydrous ethanol and then washed with 500g deionized water. The mixture was then vacuum dried at 80℃ for 10 hours to obtain modified SBS.

[0046] Example 4: Preparation of anti-aging agent:

[0047] A1: Add 800 ml DMF, 160 g oleic acid, and 10 g strong acid cation exchange resin to the reactor, stir and mix well, heat to 50 °C, then mix 50 g formic acid and 160 g 30 wt% H2O2 solution, slowly add the mixture of formic acid and H2O2 solution dropwise over 20 min, react for 8 h, cool to room temperature, transfer the supernatant to a separatory funnel, let stand, discard the lower inorganic liquid, and extract three times with deionized water (200 ml each time). Distill under reduced pressure at 80 °C for 2 h to obtain the epoxy compound; the reaction equation is shown below:

[0048]

[0049] A2: Add 500g of epoxide compound and 10g of chromium acetylacetone to the reactor, stir, heat to 170℃ and react for 5h, then cool to room temperature, add 800ml of methanol, stir, precipitate, filter, and dry under vacuum at 50℃ for 3h to obtain the polymer; the reaction equation is shown below:

[0050]

[0051] A3: Under nitrogen protection, 300g of N,N-dimethylformamide, 60g of polymer, 10g of 3-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)-3-hydroxyphenoxy)-2-hydroxypropyl methacrylate, 4g of catalyst C-94, and 2g of 1-butyl-3-methylimidazolium methanesulfonate ionic liquid were added sequentially to the reactor. The temperature was raised to 100℃, and the reaction was carried out for 5 hours. After cooling to room temperature, 200g of deionized water was added and stirred evenly. The mixture was centrifuged, washed with 100g of anhydrous ethanol and then washed with 100g of deionized water. The mixture was then vacuum dried at 80℃ for 10 hours to obtain the anti-aging agent. The reaction equation is shown below:

[0052]

[0053] Example 5: Preparation of high-viscosity, high-elasticity asphalt:

[0054] (1) Weigh out: 1000g of base asphalt, 50g of tackifier (hydrogenated rosin glycerol ester), 20g of nano montmorillonite, 15g of graphene oxide, 80g of modified SBS (prepared in Example 1), 5g of anti-aging agent (prepared in Example 4), and 1g of crosslinking agent (sulfur);

[0055] (2) Heat the base asphalt to 160℃ to melt it, then add the tackifier and shear at 2000rpm for 20min; cool down to 155℃, add modified SBS and anti-aging agent, and shear at 4000rpm for 40min; heat up to 175℃, add crosslinking agent, and react for 30min; add nano montmorillonite and graphene oxide, and shear at 5000rpm for 60min; react at 160℃ for 2h to obtain high viscosity and high elasticity asphalt.

[0056] Example 6: Preparation of high-viscosity, high-elasticity asphalt:

[0057] (1) Weigh out: 1000g of base asphalt, 60g of tackifier (hydrogenated rosin glycerol ester), 25g of nano montmorillonite, 25g of graphene oxide, 100g of modified SBS (prepared in Example 2), 8g of anti-aging agent (prepared in Example 4), and 2g of crosslinking agent (sulfur);

[0058] (2) Heat the base asphalt to 160℃ to melt it, then add the tackifier and shear at 2000rpm for 20min; cool down to 155℃, add modified SBS and anti-aging agent, and shear at 4000rpm for 40min; heat up to 175℃, add crosslinking agent, and react for 30min; add nano montmorillonite and graphene oxide, and shear at 5000rpm for 60min; react at 160℃ for 2h to obtain high viscosity and high elasticity asphalt.

[0059] Example 7: Preparation of high-viscosity, high-elasticity asphalt:

[0060] (1) Weigh out: 1000g of base asphalt, 80g of tackifier (hydrogenated rosin glycerol ester), 30g of nano montmorillonite, 30g of graphene oxide, 120g of modified SBS (prepared in Example 3), 12g of anti-aging agent (prepared in Example 4), and 3g of crosslinking agent (sulfur);

[0061] (2) Heat the base asphalt to 160℃ to melt it, then add the tackifier and shear at 2000rpm for 20min; cool down to 155℃, add modified SBS and anti-aging agent, and shear at 4000rpm for 40min; heat up to 175℃, add crosslinking agent, and react for 30min; add nano montmorillonite and graphene oxide, and shear at 5000rpm for 60min; react at 160℃ for 2h to obtain high viscosity and high elasticity asphalt.

[0062] Comparative Example 1

[0063] The raw material composition and process of the high-viscosity, high-elasticity asphalt are basically the same as those in Example 6, except that the modified SBS is replaced with an equal weight of modified SBS prepared by the following method:

[0064] The preparation method of modified SBS is basically the same as that in Example 2, except that 1,3-bis((2,2-dimethyl-1,3-dioxapentane-4-yl)methoxy)prop-2-amine in step S1 is replaced with an equal weight of 2,2-dimethyl-1,3-dioxapentane-4-methylamine.

[0065] Comparative Example 2

[0066] The raw material composition and process of the high-viscosity, high-elasticity asphalt are basically the same as those in Example 6, except that the modified SBS is replaced with an equal weight of modified SBS prepared by the following method:

[0067] The preparation method of modified SBS is basically the same as that in Example 2, except that the four-arm polyethylene glycol mercapto group in step S2 is replaced with an equal weight of pentaerythritol tetrakis(3-mercaptopropionic acid) ester.

[0068] Comparative Example 3

[0069] The raw material composition and process of the high-viscosity, high-elasticity asphalt are basically the same as those in Example 6, except that the modified SBS is replaced with an equal weight of modified SBS prepared by the following method:

[0070] The preparation method of modified SBS is basically the same as that in Example 2, except that the four-arm polyethylene glycol thiol group in step S2 is replaced with an equal weight of six-arm polyethylene glycol thiol group.

[0071] Comparative Example 4

[0072] The raw material composition and process of the high-viscosity, high-elasticity asphalt are basically the same as those in Example 6, except that the modified SBS is replaced with an equal weight of modified SBS prepared by the following method:

[0073] S1: Under nitrogen protection, 800g DMSO, 70g tetra-arm polyethylene glycol mercapto, and 40g hydroxyethyl methacrylate were added to the reactor and stirred until homogeneous. The mixture was heated to 90℃, and then 14g initiator AIBN was added. After reacting for 22h, the mixture was distilled under reduced pressure at 70℃ for 2h and separated by silica gel column chromatography to obtain intermediate 1.

[0074] S2: Under nitrogen protection, 1500g N,N-dimethylformamide, 10g intermediate 1, 350g SBS, 20g catalyst C-94, and 8g 1-butyl-3-methylimidazolium methane sulfonate ionic liquid were added sequentially to the reactor. The temperature was raised to 110℃ and reacted for 4 hours. After cooling to room temperature, 2000g deionized water was added and stirred evenly. The mixture was centrifuged, washed with 300g anhydrous ethanol and then washed with 300g deionized water. The mixture was then vacuum dried at 80℃ for 10 hours to obtain modified SBS.

[0075] Comparative Example 5

[0076] The raw material composition and process of the high-viscosity and high-elasticity asphalt are basically the same as those in Example 6. The difference is that the modified SBS is replaced with an equal weight of unmodified SBS.

[0077] Comparative Example 6

[0078] The raw material composition and process of the high-viscosity, high-elasticity asphalt are basically the same as those in Example 6, except that the anti-aging agent is replaced with an equal weight of an anti-aging agent prepared by the following method:

[0079] The preparation method of the anti-aging agent is basically the same as that in Example 4, except that the oleic acid in step A1 is replaced with an equal weight of 5-methylhexyl-2-butenoic acid.

[0080] Comparative Example 7

[0081] The raw material composition and process of the high-viscosity, high-elasticity asphalt are basically the same as those in Example 6, except that the anti-aging agent is replaced with an equal weight of an anti-aging agent prepared by the following method:

[0082] The preparation method of the anti-aging agent is basically the same as that in Example 4, except that 3-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)-3-hydroxyphenoxy)-2-hydroxypropyl methacrylate in step A3 is replaced with an equal weight of 2-(2H-benzotriazol-2-yl)-4-methyl-6-(2-propenyl)phenol.

[0083] Comparative Example 8

[0084] A high-viscosity, high-elasticity asphalt is produced using the raw material composition and process described in Example 2 of Chinese Invention Patent Publication No. CN101560332A.

[0085] The base asphalt used in the embodiments and comparative examples of this application is AH-70 road petroleum asphalt, produced by Liaoning Petrochemical Company of China National Petroleum Corporation; the nano-montmorillonite is NANOLC-NP301, produced by Zhejiang Fenghong New Material Co., Ltd.; the graphene oxide is SE3122 graphene oxide dispersion (50wt%), produced by Changzhou Sixth Element Material Technology Co., Ltd.; the hydrogenated rosin glycerol ester is GEHR-85ER, produced by Hubei Shixing Chemical Co., Ltd.; the sulfur is S-80 type special sulfur powder produced by Qingdao Luchuan Chemical Co., Ltd., with a mesh size of 400; the four-arm polyethylene glycol thiol has a molecular weight of 2000 and is designated as 4-Arm PEG-SH; the six-arm polyethylene glycol thiol has a molecular weight of 3000 and is designated as 6-Arm PEG-SH; the SBS is designated as D-1155JOP, with a styrene content of 40% and a molecular weight of 100,000; the strong acid cation exchange resin is a polymer of divinylbenzene and sodium vinylbenzene sulfonate, brand name Amberlite®. IMAC HP1110 resin is produced by Sinopharm Chemical Reagent Co., Ltd.

[0086] The oxidation resistance test of asphalt was conducted according to the standard in JTG E20-2011, using a rotating thin film oven test (T 0610-2011), with the softening point (T 0606-2011) increment as the evaluation index for oxidation resistance.

[0087] The elastic recovery rate of asphalt was tested according to the method in T0662-2000 of JTG E20-2011.

[0088] The compressive strength of asphalt was tested according to the method in T0713-2000 of JTG E20-2011. The asphalt composite material was prepared as a mixture and tested after 10 days of standard curing. The test results are shown in Table 1.

[0089] Asphalt mixtures were prepared by the following method: The asphalt composite material prepared in the examples or comparative examples was heated to 180°C. 200g of the heated asphalt composite material was mixed with 300g of fine aggregate and 600g of coarse aggregate, and stirred for 30 minutes. The coarse aggregate was basalt crushed stone with a particle size of 5-8mm and an apparent relative density of 2.83; the fine aggregate was basalt manufactured sand with a particle size of 1-2mm and an apparent relative density of 2.75. Aging performance testing: After standard curing for 10 days, the specimens were placed in a forced-ventilation oven, heated to 85°C, and subjected to long-term aging for 5 days using a 1000W high-pressure mercury lamp to simulate ultraviolet light. After aging, the specimens were naturally cooled to room temperature and left to stand for 5 hours before mechanical property testing.

[0090] Table 1 Asphalt Performance Indicators

[0091]

[0092] As can be seen from Table 1, the high-viscosity, high-elasticity asphalt prepared in Examples 5-7 of this application has excellent elastic recovery rate and anti-aging properties.

[0093] The modified SBS prepared in this invention incorporates an eight-arm hydroxyl compound, whose star-shaped topology significantly increases the branching degree of SBS, forming a denser three-dimensional cross-linked network. This structure effectively disperses stress and stores more elastic potential energy, thereby improving the elastic recovery rate of asphalt. The flexibility of polyethylene glycol segments endows the modified SBS with higher segmental mobility, making it easier for asphalt to return to its original shape after deformation. This flexibility helps to offset external stress and reduce permanent deformation. Simultaneously, the polyethylene glycol segments endow the modified SBS with amphiphilicity, enabling it to be compatible with hydrophobic components in asphalt and to form hydrogen bonds with polar components through ether bonds, improving the uniformity of SBS dispersion in asphalt. The uniformly dispersed SBS network can more effectively absorb and release stress, improving the elastic recovery rate. The amide bonds introduced by methacryloyl chloride have high thermal stability, which can delay the aging process of asphalt at high temperatures and maintain the long-term effectiveness of the elastic network. The introduced thioether bonds have high chemical stability, resisting the erosion of moisture and oxygen in humid and hot environments, improving the durability of asphalt.

[0094] The triazine ring in the prepared anti-aging agent is a UV-absorbing group. Its conjugated structure and strong electron delocalization characteristics enable it to efficiently absorb ultraviolet light, converting light energy into harmless heat energy and significantly inhibiting the photo-oxidation reaction of asphalt caused by sunlight. The phenyl substituent further enhances the absorption range and stability of the triazine ring. The hydroxyl group in the molecule can act as a free radical scavenger, combining with active free radicals generated during asphalt oxidation, interrupting the chain oxidation reaction, and delaying the hardening and embrittlement process of asphalt. The polypolyester backbone formed by the polymerization of oleic acid epoxy compounds contains stable ester bonds and has a high thermal decomposition temperature, which can withstand the high-temperature environment during asphalt processing and reduce thermal degradation. The long carbon chain of oleic acid gives the polymer backbone good flexibility, which can effectively disperse mechanical stress, reduce the propagation of microcracks caused by rigid molecular chain breakage under repeated loading, and delay fatigue aging.

[0095] Comparative Example 1,2,2-Dimethyl-1,3-dioxolane-4-methylamine contains only one 2,2-dimethyl-1,3-dioxolane ring. The monofunctional group means that the cross-linking reaction can only generate linear or low-branched structures. After hydrolysis, the number of hydroxyl groups decreases, the grafting efficiency with SBS decreases, and the modifier is ultimately difficult to effectively disperse and strengthen the asphalt matrix.

[0096] Comparative Example 2 shows that pentaerythritol tetrakis(3-mercaptopropionic acid) lacks the spatial extensibility of PEG segments, and the crosslinking sites are too concentrated, which easily leads to local stress concentration and reduces dynamic elastic recovery ability.

[0097] In Comparative Example 3, the six-arm structure of the six-arm polyethylene glycol thiol group exhibits higher branching and denser crosslinking sites. When modified with SBS, this affects the uniformity of the grafting reaction, leading to locally excessively dense or loose crosslinking networks. This non-uniformity easily induces stress concentration, reducing the deformation resistance of asphalt.

[0098] Comparative Example 4 shows that hydroxyethyl methacrylate can only form linear or low-branched structures, resulting in a significant decrease in crosslinking density. The weakening of the network structure leads to a decrease in the elastic recovery rate of asphalt.

[0099] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. However, any modifications, alterations, and variations made by those skilled in the art without departing from the scope of the present invention based on the disclosed technical content are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A high tack, high elasticity bitumen, characterized in that, The ingredients include the following parts by weight: The composition includes 100 parts base asphalt, 5-8 parts tackifier, 2-3 parts nano-montmorillonite, 1.5-3 parts graphene oxide, 8-12 parts modified SBS, 0.5-1.2 parts anti-aging agent, and 0.1-0.3 parts crosslinking agent. The modified SBS is prepared by the following method: S1: Under nitrogen protection, 1,3-bis((2,2-dimethyl-1,3-dioxapentane-4-yl)methoxy)prop-2-amine reacts with methacryloyl chloride in the presence of triethylamine to form an amide compound; S2: Under nitrogen protection, the four-armed polyethylene glycol mercapto group reacts with the amide compound under the action of the initiator AIBN to generate an eight-armed cyclopentane compound, and the eight-armed cyclopentane compound is hydrolyzed to generate an eight-armed hydroxy compound. S3: Under nitrogen protection, an eight-armed hydroxyl compound reacts with SBS in the presence of catalyst C-94 and 1-butyl-3-methylimidazolium methane sulfonate ionic liquid to obtain modified SBS; The anti-aging agent is prepared by the following method: A1: Oleic acid reacts with formic acid and H2O2 to form an epoxy compound; A2: Epoxides form polymers under the action of chromium acetylacetone; A3: The polymer reacts with 3-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)-3-hydroxyphenoxy)-2-hydroxypropyl methacrylate to obtain an anti-aging agent.

2. The high tack, high elasticity bitumen of claim 1, wherein, In step S1, the mass ratio of 1,3-bis((2,2-dimethyl-1,3-dioxapentane-4-yl)methoxy)prop-2-amine to methacryloyl chloride is 3:(2-3).

3. The high tack, high elasticity bitumen of claim 1, wherein, In step S2, the mass ratio of the four-arm polyethylene glycol thiol group to the amide compound is (6-8):

4.

4. The high-viscosity, high-elasticity asphalt according to claim 1, characterized in that, In step S3, the mass ratio of the octagonal hydroxyl compound to SBS is 1:(30-40).

5. The high tack, high elasticity bitumen of claim 1, wherein, In step A1, the mass ratio of oleic acid to formic acid is 16:

5.

6. The high tack, high elasticity bitumen of claim 1, wherein, In step A2, the mass ratio of epoxy compound to chromium acetylacetone is 50:

1.

7. The high tack, high elasticity bitumen of claim 1, wherein, In step A3, the mass ratio of the polymer to 3-(4-(4,6-diphenyl-1,3,5-triazine-2-yl)-3-hydroxyphenoxy)-2-hydroxypropyl methacrylate is 6:

1.

8. The high tack, high elasticity bitumen of claim 1, wherein, The thickener is hydrogenated rosin glycerol ester; the crosslinking agent is sulfur.

9. A process for the preparation of the high-sticky high-elasticity bitumen as claimed in any one of claims 1 to 8, characterized in that, Includes the following steps: (1) Weigh out the following by weight: 100 parts of base asphalt, 5-8 parts of tackifier, 2-3 parts of nano-montmorillonite, 1.5-3 parts of graphene oxide, 8-12 parts of modified SBS, 0.5-1.2 parts of anti-aging agent, and 0.1-0.3 parts of crosslinking agent; (2) Heat the base asphalt to 160℃ to melt it, then add the tackifier and shear at 2000rpm for 20min; cool down to 155℃, add modified SBS and anti-aging agent, and shear at 4000rpm for 40min; heat up to 175℃, add crosslinking agent, and react for 30min; add nano montmorillonite and graphene oxide, and shear at 5000rpm for 60min; react at 160℃ for 2h to obtain high viscosity and high elasticity asphalt.

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