Preparation method of regenerated fiber high-viscosity pitch

Abstract

The application relates to the technical field of road engineering materials, in particular to a preparation method of regenerated fiber high-viscosity asphalt, which comprises the following steps: mixing regenerated polyester fibers, glass fibers and basalt fibers to obtain mixed fibers; immersing the mixed fibers into a chemical modification reagent to obtain surface-modified reinforced micro-nano polyester glass fibers; adding the reinforced micro-nano polyester glass fibers according to 2.1%-3.8% of the mass of the road asphalt, and adding an interface coupling agent in the stirring and dispersing process, so that the fibers are uniformly dispersed in the asphalt and form a three-dimensional network structure, and the regenerated fiber high-viscosity asphalt is prepared. Through the synergistic effect of the composite fiber system design, the fiber surface micro-nano structure modification and the interface coupling agent, the core effects of significantly improving the bonding strength, synergistically enhancing the high-temperature stability and the low-temperature crack resistance are realized. Therefore, the problems of poor compatibility between the fibers and the asphalt, weak interface bonding, uneven fiber dispersion and the like in the prior art are solved.

Description

Technical Field

[0001] This application relates to the field of road engineering materials technology, and in particular to a method for preparing high-viscosity asphalt using recycled fibers. Background Technology

[0002] With the development of highway transportation towards heavy-load and high-speed directions, traditional asphalt and conventional modified asphalt are prone to rutting, cracking, and other defects under complex service environments, making it difficult to meet the requirements of high-grade highways and heavy-load roads. Fiber modification has become a key technology for improving the overall performance of asphalt. Glass fiber, basalt fiber, and polyester fiber each have their performance advantages, but single-fiber modification has shortcomings. Although recycled polyester fiber can realize the utilization of solid waste resources and reduce costs, its surface inertness leads to poor compatibility with asphalt and uneven dispersion, limiting its large-scale application.

[0003] Existing technologies mostly focus on the modification of single or simple mixed fibers, lacking regulation of multi-fiber synergistic effects, insufficient optimization of mixed fiber surface modification, difficulty in balancing fiber roughening and the introduction of active functional groups, and limited interfacial bonding strengthening effects; at the same time, poor control of fiber dispersion process and coupling agent combination makes it impossible to form a stable three-dimensional network structure, resulting in insufficient improvement in modified asphalt performance and difficulty in meeting the requirements of high-performance pavement. There is an urgent need for an environmentally friendly, economical, and synergistically efficient method for preparing high-viscosity asphalt using recycled fibers. Summary of the Invention

[0004] This application provides a method for preparing high-viscosity asphalt using recycled fibers, in order to solve the problems of poor compatibility between fibers and asphalt, weak interfacial bonding, and uneven fiber dispersion in the prior art.

[0005] One embodiment of this application provides a method for preparing high-viscosity asphalt using recycled fiber, including the following steps, such as... Figure 1 As shown: Regenerated polyester fiber, glass fiber, and basalt fiber were obtained according to the formula for high-viscosity asphalt with recycled fiber. The recycled polyester fiber, glass fiber, and basalt fiber were placed in a high-speed mixer and mixed for 5-8 minutes at a speed of 300-500 r / min to obtain mixed fibers. The mixed fibers were immersed in a chemical modifying agent and treated at 60-80℃ for 1-2 hours. After treatment, the mixed fibers were removed, rinsed with deionized water until neutral, and dried at 105℃ for 2-3 hours to obtain surface-modified reinforced micro / nano polyester glass fiber. Road asphalt was heated to 145-170℃, and the reinforced micro / nano polyester glass fiber was added at 2.1%-3.8% of the road asphalt mass. The mixture was stirred at 300-500 r / min for 15-30 minutes. During the stirring and dispersion process, an interfacial coupling agent at 0.1%-1.0% of the road asphalt mass was added to uniformly disperse the fibers in the asphalt and form a three-dimensional network structure, thus obtaining high-viscosity asphalt with recycled fiber.

[0006] Preferably, the weight distribution ratio of the recycled fiber high viscosity asphalt formulation includes: 22-31 parts recycled polyester fiber, 39-62 parts glass fiber, and 19-32 parts basalt fiber.

[0007] Preferably, the chemical modifying reagent is a separate silane coupling agent solution and a potassium permanganate solution, wherein the silane coupling agent solution is a mixed solution of silane coupling agent and ethanol with a mass fraction of 2%-5%, and the potassium permanganate solution is a deionized aqueous solution with a mass fraction of 1%-3%.

[0008] Preferably, the silane coupling agent is at least one selected from γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, and vinyltriethoxysilane.

[0009] Preferably, the road asphalt is one of road petroleum asphalt, SBS modified asphalt, or rubber modified asphalt.

[0010] Preferably, the interfacial coupling agent is at least one of maleic anhydride grafted polymer, multifunctional epoxy resin, or titanate coupling agent.

[0011] Preferably, the stirring and dispersing process includes: heating the road asphalt to 145-170°C, stirring at 300-500 r / min for 15-30 min, then cooling to 140-150°C and stirring for 10 min to ensure that the fibers are uniformly dispersed and form a stable three-dimensional network structure.

[0012] Preferably, the mixed fibers are chemically modified by immersing them in a chemical modifying agent, comprising the following steps: immersing the mixed fibers in a deionized aqueous solution containing 1%-3% potassium permanganate by mass, treating at 60-80°C for 0.5-1 h, rinsing with deionized water until neutral, and drying to obtain oxidized and etched mixed fibers; immersing the oxidized and etched mixed fibers in an ethanol solution containing 2%-5% silane coupling agent, treating at 60-80°C for 0.5-1 h, rinsing with deionized water until neutral, and drying at 105°C for 2-3 h to obtain surface-modified reinforced micro / nano polyester glass fibers.

[0013] Preferably, the prepared regenerated fiber high viscosity asphalt has a softening point increase rate of 19%-34% and a penetration reduction rate of 21%-35% compared with ordinary asphalt.

[0014] Therefore, this application has at least the following beneficial effects: (1) In the embodiments of this application, by accurately proportioning recycled polyester fiber, glass fiber and basalt fiber, the performance of the three fibers is synergistically enhanced, giving full play to the toughness of recycled polyester fiber, the high strength of glass fiber and the high temperature resistance of basalt fiber, making up for the performance shortcomings of single fiber modification, and taking into account the mechanical strength and service stability of asphalt.

[0015] (2) In the embodiments of this application, recycled polyester fiber is used as one of the main components, which realizes the high-value utilization of waste textiles, reduces the cost of raw materials, conforms to the development direction of green building materials and circular economy, and improves the utilization value and technical feasibility of recycled fiber through fiber modification.

[0016] (3) In the embodiments of this application, silane coupling agent and potassium permanganate solution are used to synergistically modify the fiber. On the one hand, potassium permanganate oxidation is used to construct a micro-nano rough structure on the fiber surface to enhance mechanical interlocking. On the other hand, active functional groups are introduced by silane coupling agent to enhance the chemical activity of the fiber surface and enhance the chemical bonding with asphalt. Combined with the synergistic effect of the addition of interface coupling agent, the interfacial bonding performance between the fiber and asphalt is greatly enhanced, effectively solving the technical pain points of poor compatibility and uneven dispersion caused by the surface inertness of regenerated fiber.

[0017] (4) In this embodiment of the application, the segmented dispersion process of precise control of stirring and heat preservation stirring can make the modified reinforced micro-nano polyester glass fiber uniformly dispersed in asphalt, forming a stable three-dimensional network structure, which significantly inhibits the high-temperature flow deformation of asphalt and improves the low-temperature crack resistance. The final high viscosity asphalt has a softening point increase rate of 19%-34% and a penetration reduction rate of 21%-35% compared with ordinary asphalt. Its comprehensive performance is suitable for the use needs of high-grade highways, heavy-load roads and other scenarios.

[0018] This solves the problems of poor compatibility between fibers and asphalt, weak interfacial bonding, and uneven fiber dispersion in existing technologies.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart of a method for preparing high-viscosity asphalt using recycled fibers, according to an embodiment of this application. Detailed Implementation

[0021] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] The reagents and equipment used in the embodiments of this disclosure are all conventional and commercially available.

[0023] Example 1 Preparation of high-viscosity asphalt with regenerated fibers (basic mix proportions) (1) Raw material formula (by weight): recycled polyester fiber: 25 parts, glass fiber: 50 parts, basalt fiber: 25 parts; road asphalt: 1000 parts; interface coupling agent: 5 parts (0.5% of the mass of road asphalt).

[0024] The road asphalt is 70# road petroleum asphalt. The interface coupling agent is maleic anhydride-grafted polyethylene.

[0025] Chemical modifying reagents (by weight): silane coupling agent (γ-aminopropyltriethoxysilane): 3 parts (3% by mass), potassium permanganate: 2 parts (2% by mass), deionized water: 95 parts.

[0026] (2) Preparation steps: 1) Preparation of chemical modification reagents: Dissolve the silane coupling agent in an appropriate amount of ethanol and stir to form an ethanol solution of the silane coupling agent; add potassium permanganate to a deionized aqueous solution and stir to form a deionized aqueous solution of potassium permanganate. 2) Preparation of mixed fibers: Weigh out recycled polyester fiber, glass fiber and basalt fiber according to the weight parts, put them into a high-speed mixer, and mix for 6 minutes at a speed of 400 r / min to obtain mixed fibers; 3) Preparation of reinforced micro / nano polyester glass fiber: The mixed fiber was immersed in a deionized aqueous solution of potassium permanganate and treated at 70°C for 0.5 h. After treatment, the mixed fiber was taken out, rinsed with deionized water, and then immersed in an ethanol solution of silane coupling agent and treated at 70°C for 1 h. After treatment, the mixed fiber was taken out, rinsed with deionized water until neutral, and dried at 105°C for 2.5 h to obtain surface-modified reinforced micro / nano polyester glass fiber. 4) Preparation of high-viscosity asphalt: road asphalt is heated to 160℃, and reinforced micro-nano polyester glass fiber is added at 2.8% of the mass of road asphalt; first, it is stirred at 400r / min for 20min, and an interfacial coupling agent is added during the stirring and dispersion process. Then, the temperature is reduced to 145℃, and the temperature is kept warm and stirred for 10min to make the fiber uniformly dispersed in the asphalt and form a three-dimensional network structure, thus obtaining the recycled fiber high-viscosity asphalt product. 5) Finished product processing: The obtained recycled fiber high viscosity asphalt is kept at 120℃ for 15 minutes to remove air bubbles, then naturally cooled to room temperature and sealed for storage.

[0027] Example 2 Preparation of high-viscosity asphalt using recycled fibers (low fiber ratio) (1) Raw material formula (by weight): recycled polyester fiber: 22 parts, glass fiber: 62 parts, basalt fiber: 16 parts; road asphalt: 1000 parts; interface coupling agent: 5 parts (0.21% of the mass of road asphalt).

[0028] The road asphalt is 90# road petroleum asphalt. The interface coupling agent is a multifunctional epoxy resin.

[0029] Chemical modifying reagents (by weight): silane coupling agent (γ-glycidoxypropyltrimethoxysilane): 2 parts (3% by mass), potassium permanganate: 1 part (1% by mass), deionized water: 97 parts.

[0030] (2) Preparation steps: 1) Preparation of chemical modification reagents: Dissolve the silane coupling agent in an appropriate amount of ethanol and stir to form an ethanol solution of the silane coupling agent; add potassium permanganate to a deionized aqueous solution and stir to form a deionized aqueous solution of potassium permanganate. 2) Preparation of mixed fibers: Weigh out recycled polyester fiber, glass fiber and basalt fiber according to the weight parts, put them into a high-speed mixer, and mix for 8 minutes at a speed of 300 r / min to obtain mixed fibers; 3) Preparation of reinforced micro / nano polyester glass fiber: The mixed fiber was immersed in a deionized aqueous solution of potassium permanganate and treated at 60°C for 1 hour. After treatment, the mixed fiber was taken out, rinsed with deionized water, and then immersed in an ethanol solution of silane coupling agent and treated at 60°C for 1 hour. After treatment, the mixed fiber was taken out, rinsed with deionized water until neutral, and dried at 105°C for 3 hours to obtain surface-modified reinforced micro / nano polyester glass fiber. 4) Preparation of high-viscosity asphalt: road asphalt is heated to 150℃, and reinforced micro-nano polyester glass fiber is added at 2.1% of the mass of road asphalt; first, it is stirred at 300r / min for 15min, and an interfacial coupling agent is added during the stirring and dispersion process. Then, the temperature is reduced to 140℃, and the temperature is kept warm and stirred for 10min to make the fiber uniformly dispersed in the asphalt and form a three-dimensional network structure, thus obtaining the recycled fiber high-viscosity asphalt product. 5) Finished product processing: The obtained recycled fiber high viscosity asphalt is kept at 120℃ for 15 minutes to remove air bubbles, then naturally cooled to room temperature and sealed for storage.

[0031] Example 3 Preparation of high-viscosity asphalt using regenerated fibers (high fiber ratio) (1) Raw material formula (by weight): recycled polyester fiber: 31 parts, glass fiber: 39 parts, basalt fiber: 30 parts; road asphalt: 1000 parts; interface coupling agent: 5 parts (1% of the mass of road asphalt).

[0032] The asphalt used for roads is SBS modified asphalt. The interfacial coupling agent is a titanate coupling agent.

[0033] Chemical modifying reagents (by weight): silane coupling agent (vinyltriethoxysilane): 5 parts (5% by mass), potassium permanganate: 3 parts (3% by mass), deionized water: 92 parts.

[0034] (2) Preparation steps: 1) Preparation of chemical modification reagents: Dissolve the silane coupling agent in an appropriate amount of ethanol and stir to form an ethanol solution of the silane coupling agent; add potassium permanganate to a deionized aqueous solution and stir to form a deionized aqueous solution of potassium permanganate. 2) Preparation of mixed fibers: Weigh out recycled polyester fiber, glass fiber and basalt fiber according to the weight parts, put them into a high-speed mixer, and mix for 5 minutes at a speed of 500 r / min to obtain mixed fibers; 3) Preparation of reinforced micro / nano polyester glass fiber: The mixed fiber was immersed in a deionized aqueous solution of potassium permanganate and treated at 80°C for 1 hour. After treatment, the mixed fiber was taken out, rinsed with deionized water, and then immersed in an ethanol solution of silane coupling agent and treated at 80°C for 1 hour. After treatment, the mixed fiber was taken out, rinsed with deionized water until neutral, and dried at 105°C for 3 hours to obtain surface-modified reinforced micro / nano polyester glass fiber. 4) Preparation of high-viscosity asphalt: road asphalt is heated to 165℃, and reinforced micro-nano polyester glass fiber is added at 3.8% of the mass of road asphalt; first, it is stirred at 500r / min for 30min, and an interfacial coupling agent is added during the stirring and dispersion process. Then, the temperature is reduced to 150℃, and the temperature is kept warm and stirred for 10min to make the fiber uniformly dispersed in the asphalt and form a three-dimensional network structure, thus obtaining the recycled fiber high-viscosity asphalt product. 5) Finished product processing: The obtained recycled fiber high viscosity asphalt is kept at 120℃ for 15 minutes to remove air bubbles, then naturally cooled to room temperature and sealed for storage.

[0035] Comparative Example 1 (without fiber surface modification) (1) Raw material formula (by weight): recycled polyester fiber: 25 parts, glass fiber: 50 parts, basalt fiber: 25 parts; road asphalt: 1000 parts; interface coupling agent: 5 parts (0.5% of the mass of road asphalt).

[0036] The road asphalt is 70# road petroleum asphalt. The interface coupling agent is maleic anhydride-grafted polyethylene.

[0037] (2) Preparation steps: 1) Preparation of mixed fibers: Weigh out recycled polyester fiber, glass fiber and basalt fiber according to the weight parts, put them into a high-speed mixer, and mix for 6 minutes at a speed of 400 r / min to obtain mixed fibers; 2) Preparation of high viscosity asphalt: road asphalt is heated to 160℃, and mixed fibers are added at 2.8% of the mass of road asphalt; first, it is stirred at 400r / min for 20min, and an interfacial coupling agent is added during the stirring and dispersion process. Then, the temperature is reduced to 145℃, and stirred for 10min to make the fibers uniformly dispersed in the asphalt and form a three-dimensional network structure, thus obtaining the recycled fiber high viscosity asphalt product. 5) Finished product processing: The obtained recycled fiber high viscosity asphalt is kept at 120℃ for 15 minutes to remove air bubbles, then naturally cooled to room temperature and sealed for storage.

[0038] Comparative Example 2 (Single Recycled Polyester Fiber) (1) Raw material formula (by weight): 100 parts of recycled polyester fiber; 1000 parts of road asphalt; 5 parts of interfacial coupling agent (0.5% of the mass of road asphalt).

[0039] The road asphalt is 70# road petroleum asphalt. The interface coupling agent is maleic anhydride-grafted polyethylene.

[0040] Chemical modifying reagents (by weight): silane coupling agent (γ-aminopropyltriethoxysilane): 3 parts (3% by mass), potassium permanganate: 2 parts (2% by mass), deionized water: 95 parts.

[0041] (2) Preparation steps: 1) Preparation of chemical modification reagent: Dissolve the silane coupling agent in an appropriate amount of ethanol and stir to form a pre-dispersion; slowly add the pre-dispersion to a deionized water solution containing potassium permanganate while stirring, and stir for 45 minutes; adjust the pH to 5 with dilute hydrochloric acid to obtain the chemical modification reagent. 2) Modification treatment of recycled polyester fibers: Immerse the recycled polyester fibers in a chemical modifying agent and treat them at 70°C for 1.5 hours. After treatment, take out the recycled polyester fibers, rinse them with deionized water until neutral, and dry them at 105°C for 2.5 hours to obtain surface-modified recycled polyester fibers. 3) Preparation of high-viscosity asphalt: road asphalt is heated to 160℃, and surface-modified recycled polyester fiber is added at 2.8% of the mass of road asphalt; first, it is stirred at 400r / min for 20min, and an interfacial coupling agent is added during the stirring and dispersion process. Then, the temperature is reduced to 145℃, and stirred for 10min to make the fiber uniformly dispersed in the asphalt and form a three-dimensional network structure, thus obtaining the recycled fiber high-viscosity asphalt product. 4) Finished product processing: The obtained recycled fiber high viscosity asphalt is kept at 120℃ for 15 minutes to remove air bubbles, then naturally cooled to room temperature and sealed for storage.

[0042] Comparative Example 3 (without added interfacial coupling agent) (1) Raw material formula (by weight): 25 parts recycled polyester fiber, 50 parts glass fiber, 25 parts basalt fiber; 1000 parts road asphalt.

[0043] The asphalt used for roads is 70# road petroleum asphalt.

[0044] Chemical modifying reagents (by weight): silane coupling agent (γ-aminopropyltriethoxysilane): 3 parts (3% by mass), potassium permanganate: 2 parts (2% by mass), deionized water: 95 parts.

[0045] (2) Preparation steps: 1) Preparation of chemical modification reagent: Dissolve the silane coupling agent in an appropriate amount of ethanol and stir to form a pre-dispersion; slowly add the pre-dispersion to a deionized water solution containing potassium permanganate while stirring, and stir for 45 minutes; adjust the pH to 5 with dilute hydrochloric acid to obtain the chemical modification reagent. 2) Preparation of mixed fibers: Weigh out recycled polyester fiber, glass fiber and basalt fiber according to the weight parts, put them into a high-speed mixer, and mix for 6 minutes at a speed of 400 r / min to obtain mixed fibers; 3) Preparation of reinforced micro / nano polyester glass fiber: The mixed fiber was immersed in a chemical modification reagent and treated at 70°C for 1.5 h. After treatment, the mixed fiber was taken out, rinsed with deionized water until neutral, and dried at 105°C for 2.5 h to obtain surface-modified reinforced micro / nano polyester glass fiber. 4) Preparation of high viscosity asphalt: road asphalt is heated to 160℃, and reinforced micro-nano polyester glass fiber is added at 2.8% of the mass of road asphalt; first, it is stirred at 400r / min for 20min, then the temperature is reduced to 145℃, and stirred for 10min to obtain the recycled fiber high viscosity asphalt product. 5) Finished product processing: The obtained recycled fiber high viscosity asphalt is kept at 120℃ for 15 minutes to remove air bubbles, then naturally cooled to room temperature and sealed for storage.

[0046] Performance testing Regenerated fiber high-viscosity asphalt prepared in Examples 1-3 and Comparative Examples 1-3 was selected, and unmodified 70# road petroleum asphalt was selected as a blank control group. Three samples were prepared for each group of samples, and the softening point, penetration, and ductility of the binder were tested. The specific test methods are as follows: (1) Softening point test: The ring and ball method was used, the heating rate was 5℃ / min, the temperature when the asphalt softened was recorded, and the softening point growth rate was calculated compared with the blank control group. (2) Penetration test: At 25℃, a standard needle (mass 100g) was used to record the depth of the needle into the asphalt within 5s (0.1mm), and the reduction rate of penetration was calculated compared with the blank control group.

[0047] (3) Ductility test of the asphalt mortar: At 15℃, a ductility tester was used with a stretching rate of 5cm / min to record the elongation length (cm) when the asphalt mortar broke. The ductility improvement rate of the mortar was calculated compared with that of the blank control group.

[0048] The specific test results are shown in Table 1 (the average value of 3 samples is taken):

[0049] Table 1 Test Results As shown in Table 1, the softening point growth rate of Examples 1-3 ranged from 19% to 34%, significantly higher than that of Comparative Examples 1-3 (8%-15%). This indicates that the present application, through the synergistic formulation of recycled polyester fiber, glass fiber, and basalt fiber, combined with the chemical modification of fiber surface and the effect of interfacial coupling agent, can effectively improve the high-temperature stability of asphalt and inhibit the flow deformation of asphalt under high-temperature environment. Among them, Example 3, due to its high fiber ratio, showed the best softening point improvement effect. The penetration reduction rate of Examples 1-3 was 21%-35%, significantly higher than that of Comparative Examples 1-3 (7%-16%). This indicates that the preparation method of the present application can effectively improve the consistency and hardness of asphalt, enhance the shear resistance of asphalt, reduce the occurrence of rutting disease on the road surface under heavy load conditions, and adapt to the load-bearing requirements of different grades of highways. Although the performance improvement of Example 2 with a low fiber ratio was slightly lower, it could still meet the requirements of light-load highways. The ductility improvement rate of the asphalt mortar in Examples 1-3 reached 17%-32%, significantly better than that in Comparative Examples 1-3 (5%-11%). This demonstrates that the proposed method can effectively enhance the flexibility and ductility of the asphalt mortar, improve the low-temperature crack resistance of asphalt pavement, prevent cracking and spalling of the pavement in low-temperature environments, and extend the service life of the pavement. It is evident that the recycled fiber high-viscosity asphalt prepared in this application exhibits excellent performance in high-temperature stability, shear resistance, and low-temperature toughness. Compared with comparative examples lacking fiber modification, single-fiber modification, or without the addition of an interfacial coupling agent, the overall performance is significantly improved, confirming the rationality and superiority of the preparation method proposed in this application.

[0050] In summary, this method for preparing high-viscosity asphalt using recycled fibers has significant advantages: In terms of formulation, the precise ratio of recycled polyester fiber, glass fiber, and basalt fiber achieves synergistic performance enhancement, complements the shortcomings of single fiber modification, and fully releases the toughness, high strength, and high temperature resistance of various fibers. The introduction of recycled polyester fiber enables high-value utilization of waste textile resources, aligns with the development direction of green building materials and circular economy, and reduces raw material costs. Combined with silane coupling agent, potassium permanganate composite modification reagent, and special interface coupling agent, the problem of surface inertness of recycled fiber is solved, which greatly improves the compatibility and interfacial adhesion between fiber and asphalt, laying the foundation for high product performance.

[0051] In terms of preparation method, a segmented process design is adopted. Through a combination of targeted fiber surface synergistic modification and gradient stirring, it is ensured that the modified fibers are uniformly dispersed in asphalt and form a stable three-dimensional network structure. This effectively inhibits the high-temperature flow deformation of asphalt and improves its low-temperature crack resistance, so that the softening point, penetration, and ductility of the finished product all meet the standards for use on high-grade highways and heavy-duty roads. The overall process steps are clear and the parameters are controllable. No complex equipment is required. It can be flexibly adjusted according to the different service requirements of highways, taking into account both preparation efficiency and product stability, which is conducive to large-scale promotion and application. At the same time, the technical feasibility of utilizing recycled fibers is improved by standardizing the process.

[0052] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

[0053] The present application and its embodiments have been described above. This description is not restrictive, and the actual application is not limited thereto. In conclusion, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the spirit of this application, such design should fall within the protection scope of this application.

Claims

1. A method for preparing high-viscosity asphalt using recycled fiber, characterized in that, Includes the following steps: Regenerated polyester fiber, glass fiber, and basalt fiber were obtained according to the high viscosity asphalt formulation of recycled fiber. Recycled polyester fiber, glass fiber, and basalt fiber are placed in a high-speed mixer and mixed for 5-8 minutes at a speed of 300-500 r / min to obtain mixed fibers. The mixed fibers were immersed in a chemical modification reagent and treated at 60-80°C for 1-2 hours. After treatment, the mixed fibers were removed, rinsed with deionized water until neutral, and dried at 105°C for 2-3 hours to obtain surface-modified reinforced micro-nano polyester glass fibers. The road asphalt is heated to 145-170℃, and the reinforced micro-nano polyester glass fiber is added at 2.1%-3.8% of the asphalt mass. Stir at 300-500 r / min for 15-30 min. During the stirring and dispersion process, add an interfacial coupling agent accounting for 0.1%-1.0% of the mass of the road asphalt to make the fibers uniformly dispersed in the asphalt and form a three-dimensional network structure, thus obtaining recycled fiber high viscosity asphalt.

2. The method for preparing high-viscosity asphalt using recycled fiber according to claim 1, characterized in that, The weight distribution of the recycled fiber high viscosity asphalt formulation includes: 22-31 parts recycled polyester fiber, 39-62 parts glass fiber, and 19-32 parts basalt fiber.

3. The method for preparing high-viscosity asphalt using recycled fiber according to claim 1, characterized in that, The chemical modifying reagents are separate silane coupling agent solutions and potassium permanganate solutions, wherein the silane coupling agent solution is a mixed solution of silane coupling agent and ethanol with a mass fraction of 2%-5%, and the potassium permanganate solution is a deionized aqueous solution with a mass fraction of 1%-3%.

4. The method for preparing high-viscosity asphalt using recycled fiber according to claim 1, characterized in that, The silane coupling agent is at least one of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, and vinyltriethoxysilane.

5. The method for preparing high-viscosity asphalt using recycled fiber according to claim 1, characterized in that, The road asphalt is one of the following: road petroleum asphalt, SBS modified asphalt, or rubber modified asphalt.

6. The method for preparing high-viscosity asphalt using recycled fiber according to claim 1, characterized in that, The interface coupling agent is at least one of maleic anhydride grafted polymer, multifunctional epoxy resin, or titanate coupling agent.

7. The method for preparing high-viscosity asphalt using recycled fiber according to claim 1, characterized in that, The mixing and dispersion process includes: heating the road asphalt to 145-170℃, stirring at 300-500r / min for 15-30min, then cooling to 140-150℃, and stirring for 10min to ensure that the fibers are evenly dispersed and form a stable three-dimensional network structure.

8. The method for preparing high-viscosity asphalt using recycled fiber according to claim 1, characterized in that, The mixed fibers are immersed in a chemical modifying agent for chemical modification treatment, including the following steps: The mixed fibers are immersed in a deionized aqueous solution containing 1%-3% potassium permanganate by mass, treated at 60-80℃ for 0.5-1h, rinsed with deionized water until neutral, and dried to obtain the oxidized and etched mixed fibers. The oxidized and etched mixed fibers are immersed in an ethanol solution containing 2%-5% silane coupling agent and treated at 60-80℃ for 0.5-1h. They are then rinsed with deionized water until neutral and dried at 105℃ for 2-3h to obtain surface-modified reinforced micro-nano polyester glass fibers.

9. The method for preparing high-viscosity asphalt using recycled fiber according to claim 1, characterized in that, The prepared regenerated fiber high viscosity asphalt increased the softening point by 19%-34% and reduced the penetration by 21%-35% compared with ordinary asphalt.

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