Modified sepiolite fiber reinforced rubber asphalt and preparation method thereof

Abstract

The invention discloses modified sepiolite fiber reinforced rubber asphalt and a preparation method thereof, and relates to the technical field of asphalt, the modified sepiolite fiber reinforced rubber asphalt is prepared from base asphalt, modified sepiolite fiber, butadiene styrene rubber, perfluoropolyether siloxane, sodium dodecyl benzene sulfonate, tert-butylhydroquinone, polyvinylpyrrolidone, glycerol and deionized water. The modified sepiolite fiber reinforced rubber asphalt is prepared by mixing the base asphalt, the butadiene styrene rubber and the modified sepiolite fiber, the prepared modified sepiolite fiber not only retains the original layered and chain structure of sepiolite, but also effectively improves the pore structure of the sepiolite; the compatibility of the modified sepiolite fiber and an asphalt material reaction system is improved, and the modified sepiolite fiber can be uniformly dispersed in the reaction system, so that the isotropy of an asphalt pavement is ensured. The high and low temperature performance, the aging resistance, the mechanical property and the like of the asphalt can be improved, so that the prepared asphalt is stable in performance, short in production period and suitable for large-scale production and application.

Description

Technical Field

[0001] The invention relates to the technical field of asphalt, in particular to a modified sepiolite fiber reinforced rubber asphalt and a preparation method thereof. Background Art

[0002] In the field of highway construction, asphalt materials are widely used due to their excellent adhesion and durability. However, traditional asphalt materials are prone to deformation at high temperatures and fracture at low temperatures, which to some extent limits their application in extreme climate conditions. In order to solve this problem, fiber and rubber components are often added to improve the performance of asphalt in applications. For example, the invention patent CN 109943087 A discloses a method for manufacturing modified sepiolite fiber reinforced rubber asphalt, and the specific steps include: step 1) completely immersing the sepiolite fiber in a 50-60°C solution containing cyclodextrin and sodium hydroxide for 10-15 minutes, taking it out and drying it to obtain pretreated sepiolite fiber, wherein the content of sodium hydroxide in the solution is 5-10wt%, and the content of cyclodextrin is 2-4wt%. Ordinary sepiolite fiber has poor compatibility with asphalt, and is very easy to agglomerate during the premixing process, and the dispersion effect is poor. The present invention pretreats the sepiolite fiber + activates the surface to treat its surface, thereby enhancing the compatibility of the sepiolite fiber with the asphalt reaction system, and can ensure that it is evenly dispersed in the reaction system, thereby ensuring the isotropy of the asphalt pavement.

[0003] However, natural sepiolite has high impurity content and narrow pores, which are not conducive to the insertion of rubber molecular chains. In addition, inorganic mineral fillers with poor lipophilicity are prone to agglomeration in lipophilic rubber due to strong interfacial effects, resulting in poor reinforcement effect. Therefore, a modified sepiolite fiber-reinforced rubber asphalt and its preparation method that can retain the original layered and chain structures of sepiolite and improve its pore structure are urgently needed to be developed. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the background technology. The purpose of the present invention is to provide a modified sepiolite fiber reinforced rubber asphalt and its preparation method and equipment, which can retain the original layered and chain structure of sepiolite and improve its pore structure, improve the compatibility of sepiolite fiber and asphalt reaction system, ensure the durability and fatigue resistance of asphalt materials, and make asphalt have good elasticity.

[0005] To achieve the above object, the present invention provides the following technical solution: a modified sepiolite fiber reinforced rubber asphalt, prepared from the following components in parts by weight: 45-65 parts of base asphalt; 20-30 parts of modified sepiolite fiber; 15-25 parts of styrene-butadiene rubber; 4-8 parts of perfluoropolyether siloxane; 2-5 parts of sodium dodecylbenzene sulfonate; 1-5 parts of tert-butylhydroquinone; 2-3 parts of polyvinyl pyrrolidone; 3-5 parts of glycerol; 10-15 parts of deionized water.

[0006] A method for preparing modified sepiolite fiber reinforced rubber asphalt comprises the following steps: Step 1: Pretreatment of sepiolite fiber: put the sepiolite fiber powder in a proportion into an oven, dry it at 95-110℃, take it out after 24 hours, put it into a drying boat and cool it to room temperature, pass it through a 90-100 mesh sieve, put it into a sealed dryer and store it for later use; take the sepiolite fiber after the above drying treatment, add 10% ferrous sulfate solution at a solid-liquid ratio of 1-1.5:10, mix it, place it in a constant temperature shaker and oscillate it at room temperature for 24 hours, and centrifuge and wash it until the upper liquid does not contain Fe 2+ ; The bottom solid was then dried in an oven at 105°C, ground, passed through a 100-mesh sieve, placed in a sealed bag and stored in a desiccator; Step 2: preparing modified sepiolite fiber: adding a proportion of perfluoropolyether siloxane, propylene glycol and deionized water into a microwave chemical reactor, hydrolyzing at 80°C for 10 to 30 minutes at a microwave power of 100 to 800 W, then adding the modified sepiolite fiber prepared in step S1, stirring at 70 to 80°C for 1 hour, standing and cooling to room temperature, and filtering (negative pressure suction), drying the obtained product at 80°C for 4 hours, and then grinding and crushing to obtain the modified sepiolite fiber; Step 3: Prepare modified sepiolite fiber reinforced rubber asphalt: After heating the base asphalt to 160-170°C, add the modified sepiolite fiber prepared in step S2 and sodium dodecylbenzene sulfonate, tert-butylhydroquinone, and polyvinyl pyrrolidone in a certain proportion, and use a high-speed shearing machine for shearing at a speed of 1000-1500 rpm for a shearing time of 10-15 minutes; cool to 100-110°C, add styrene-butadiene rubber, and continue stirring for 5-10 minutes to obtain modified sepiolite fiber reinforced rubber asphalt.

[0007] As a further solution of the present invention: the microwave chemical reactor used in the step 2 includes a base, a stirring barrel is arranged at the top of the base, a barrel cover is arranged at the top of the stirring barrel, a mounting frame is fixedly connected to the top of the base located on one side of the stirring barrel, a hydraulic cylinder is installed at the top of the mounting frame, a connecting frame is connected to the output end of the hydraulic cylinder, the connecting frame is fixedly connected to the barrel cover, a first motor and three feeding pipes are installed at the top of the barrel cover, a stirring shaft is arranged in the inner cavity of the stirring barrel, a discharge port is fixedly connected to one side of the stirring barrel, a discharge pipe is connected to one end of the discharge port, a vacuum pump is installed on the outer wall of the discharge pipe, the vacuum pump is installed at the top of the base, a baffle is rotatably connected to the inner cavity of the discharge port, a second motor is installed at the bottom end of the discharge port, the output end of the second motor is connected to the baffle, a microwave heater is installed on the outer wall of the stirring barrel, the stirring shaft is installed by a docking mechanism, and the position of the stirring barrel is positioned by a positioning mechanism.

[0008] As a further solution of the present invention: the docking mechanism includes a docking plate, the docking plate is rotatably connected to the bottom end of the barrel cover, the bottom end of the docking plate is fixedly connected to a first docking block, the output end of the first motor is connected to the docking plate, the top of the mixing barrel is provided with a groove, the inner wall of the groove is slidably connected to a horizontal plate, the top of the mixing shaft is fixedly connected to a rotating plate, the rotating plate is rotatably connected to the top of the horizontal plate, the interior of the horizontal plate is located below the rotating plate and is slidably connected to a movable ring, the top of the movable ring is fixedly connected to a The second docking block, the first spring is connected between the rotating disk and the movable ring, the interior of the horizontal plate is located at one side of the movable ring and is slidably connected to a pushing frame, the interior of the horizontal plate is located at the outer wall of the pushing frame and is rotatably connected to a spur gear, the interior of the horizontal plate is located at the outer wall of the spur gear and is slidably connected to a lower pressure plate, the lower pressure plate and the horizontal plate are connected with a second spring, the interior of the horizontal plate is located at one side of the rotating disk and is slidably connected to a positioning block, the positioning block and the horizontal plate are connected with a third spring, and the outer wall of the pushing frame is located below the positioning block and is fixedly connected to an extrusion rod.

[0009] As a further solution of the present invention: the positioning mechanism includes a connecting sleeve, the connecting sleeve is rotatably connected to the outer wall of the discharge port, the outer wall of the base is rotatably connected to a rotating column, one end of the rotating column is fixedly connected to a connecting shaft, one end of the connecting shaft is fixedly connected to a bevel gear, the interior of the base is located at the outer wall of the bevel gear and is rotatably connected to a toothed disk, the top of the toothed disk is fixedly connected to a threaded rod, the interior of the base is located above the toothed disk and is slidably connected to a displacement plate, the threaded rod penetrates the displacement plate, one side of the displacement plate is fixedly connected to a displacement frame, the top of the displacement frame is fixedly connected to a block, and the top of the displacement plate is fixedly connected to a positioning plate.

[0010] As a further solution of the present invention: the outer walls of the lower pressing plate and the pushing frame are both provided with tooth grooves, the tooth grooves are meshed with the spur gears, and the first docking block is engaged with the second docking block.

[0011] As a further solution of the present invention: the outer wall of the rotating disk is provided with first slots distributed in a circumference, and one end of the positioning block is engaged with the first slots.

[0012] As a further solution of the present invention: the bottom end of the positioning block is provided with an inclined surface, and the extrusion rod is located below the inclined surface.

[0013] As a further solution of the present invention: the outer wall of the toothed disc is provided with gear teeth meshing with the bevel gear, and the outer wall of the displacement plate is provided with a threaded hole, and the threaded hole matches the threaded rod.

[0014] As a further solution of the present invention: the inner wall of the connecting sleeve is provided with an internal thread, one end of the discharge pipe is provided with an external thread, the internal thread matches the external thread, the outer wall circumference of the connecting sleeve is provided with a second groove, and the top of the block is engaged with the second groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The modified sepiolite fiber reinforced rubber asphalt of the present invention is prepared by mixing base asphalt, styrene-butadiene rubber and modified sepiolite fiber, which can improve the high and low temperature performance, aging resistance and mechanical properties of asphalt, so that the prepared asphalt concrete has stable performance and short production cycle, and is suitable for large-scale industrial production and application.

[0016] 2. The modified sepiolite fiber preparation method of the present invention not only retains the original layered and chain structures of sepiolite, but also effectively improves its pore structure; improves the compatibility of the modified sepiolite fiber with the asphalt reaction system, and can ensure that it is evenly dispersed in the reaction system, thereby ensuring the isotropy of the asphalt pavement; 3. The modified sepiolite fiber preparation method of the present invention combines the hydrothermal method and the microwave method to complete the modification in a closed reaction system, which not only heats up quickly but also has low heat loss, thereby greatly improving the reaction rate; 4. The present invention is a microwave chemical reactor designed with a matching process. The microwave chemical reactor is provided with a docking mechanism. When the stirring barrel is disassembled and cleaned, the hydraulic cylinder is started to drive the connecting frame to move upward, and the displacement of the connecting frame drives the barrel cover to move upward, and the barrel cover is separated from the stirring barrel. Then, the parts in the positioning mechanism are matched to separate the discharge port and the discharge pipe, so that the stirring barrel can be disassembled and cleaned conveniently, and the cross plate can be directly moved out of the groove to disassemble the stirring shaft; when the stirring barrel and the stirring shaft are installed, the second docking block is moved out of the rotating disk and engaged with the first docking block, so that the second motor can drive the stirring shaft to rotate, so that the stirring barrel and the stirring shaft can be quickly installed and disassembled, and the stirring barrel and the stirring shaft can be disassembled and cleaned conveniently; By setting a positioning mechanism, when connecting the discharge port and the discharge pipe, the connecting sleeve is rotated to tighten the connecting sleeve on the outer wall of the discharge pipe, thereby fixing the discharge port and the discharge pipe. Then, the rotating column is rotated to drive the displacement plate to move, and the displacement block is engaged with the connecting sleeve to fix the connecting sleeve to prevent loosening between the discharge port and the discharge pipe. At the same time, the displacement of the displacement plate drives the positioning plate to move, and the positioning plate moves out of the base, and the positioning plate is attached to the outer wall of the mixing barrel, which is convenient for connecting the discharge port and the discharge pipe, and convenient for positioning the position of the mixing barrel to prevent the mixing barrel from shifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the installation of the barrel cover of the present invention; Figure 3 is a cross-sectional view of the barrel cover of the present invention; Figure 4 It is a schematic diagram of the installation of the horizontal plate of the present invention; Figure 5 is a cross-sectional view of a horizontal plate of the present invention; Figure 6 is a cross-sectional view of a rotating disk of the present invention; Figure 7 is a cross-sectional view of the connecting sleeve of the present invention; Figure 8 It is a schematic diagram of the installation of the displacement plate of the present invention.

[0018] In the figure: 1, base; 2, mixing barrel; 3, barrel cover; 4, mounting frame; 5, hydraulic cylinder; 6, connecting frame; 7, docking mechanism; 701, docking plate; 702, first docking block; 703, groove; 704, horizontal plate; 705, rotating plate; 706, movable ring; 707, second docking block; 708, first spring; 709, pushing frame; 710, spur gear; 711, lower pressure plate; 712, second spring; 713, positioning block; 714, third spring Spring; 715, extrusion rod; 8, positioning mechanism; 801, connecting sleeve; 802, rotating column; 803, connecting shaft; 804, bevel gear; 805, toothed disc; 806, threaded rod; 807, displacement plate; 808, displacement frame; 809, block; 810, positioning plate; 9, first motor; 10, stirring shaft; 11, discharge port; 12, discharge pipe; 13, vacuum pump; 14, feed pipe; 15, baffle; 16, second motor; 17, microwave heater. DETAILED DESCRIPTION

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

[0020] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

[0021] Example 1: Preparation of modified sepiolite fiber reinforced rubber asphalt See also Figures 1 to 7In an embodiment of the present invention, a modified sepiolite fiber reinforced rubber asphalt is prepared from the following components in parts by weight: 55 parts of No. 70 base asphalt; 20 parts of modified sepiolite fiber; Styrene butadiene rubber SBR 1502E 15 parts; 4 parts of perfluoropolyether siloxane; 3 parts of sodium dodecylbenzene sulfonate; 3 parts of tert-butylhydroquinone; 2 parts of polyvinyl pyrrolidone; 3 parts of glycerol; 10 parts of deionized water.

[0022] The preparation method comprises the following steps: S1: Pretreatment of sepiolite: Place the sepiolite fiber powder in a proportioned amount in an oven and dry it at 95°C. After 24 hours, take it out and place it in a drying boat to cool it to room temperature. After passing through a 90-mesh sieve, place it in a sealed desiccator and store it for later use. Take an appropriate amount of the sepiolite fiber after the above drying treatment and add a 10% ferrous sulfate solution at a solid-liquid ratio of 1:10. Place it in a constant temperature shaker and shake it at room temperature for 24 hours. Centrifuge and wash until the upper liquid does not contain Fe. 2+ The bottom solid was then dried in an oven at 105°C, ground, passed through a 100-mesh sieve, placed in a sealed bag and stored in a desiccator.

[0023] S2: Preparation of modified sepiolite fiber: Add a proportion of perfluoropolyether siloxane, propylene glycol and deionized water into a microwave chemical reactor, hydrolyze at 80°C for 10 min under a microwave power of 100 W, then add the modified sepiolite fiber prepared in step S1, stir at 70°C for 1 h, let stand and cool to room temperature, and filter. The obtained product is dried at 80°C for 4 h and then ground to obtain the modified sepiolite fiber.

[0024] S3: Preparation of modified sepiolite fiber reinforced rubber asphalt:

[0025] After heating the base asphalt to 165°C, add the modified sepiolite fiber prepared in step S2 and sodium dodecylbenzene sulfonate, tert-butylhydroquinone, and polyvinyl pyrrolidone in a certain proportion, and use a high-speed shearing machine for shearing at a speed of 1300 rpm for 12 minutes; cool to 100°C, add styrene-butadiene rubber, and continue stirring for 8 minutes to obtain modified sepiolite fiber reinforced rubber asphalt.

[0026] Please refer to Figures 1 to 8The microwave chemical reactor used in step 2 includes a base 1, a stirring barrel 2 is arranged on the top of the base 1, a barrel cover 3 is arranged on the top of the stirring barrel 2, a mounting frame 4 is fixedly connected to the top of the base 1 on one side of the stirring barrel 2, a hydraulic cylinder 5 is installed on the top of the mounting frame 4, a connecting frame 6 is connected to the output end of the hydraulic cylinder 5, and the connecting frame 6 is fixedly connected to the barrel cover 3, a first motor 9 and three feeding pipes 14 are installed on the top of the barrel cover 3, a stirring shaft 10 is arranged in the inner cavity of the stirring barrel 2, and a stirring shaft 10 is fixed on one side of the stirring barrel 2 A discharge port 11 is connected, one end of the discharge port 11 is connected to a discharge pipe 12, a vacuum pump 13 is installed on the outer wall of the discharge pipe 12, the vacuum pump 13 is installed on the top of the base 1, the inner cavity of the discharge port 11 is rotatably connected to a baffle 15, a second motor 16 is installed at the bottom end of the discharge port 11, the output end of the second motor 16 is connected to the baffle 15, a microwave heater 17 is installed on the outer wall of the stirring barrel 2, the stirring shaft 10 is installed and operated by a docking mechanism 7, and the position of the stirring barrel 2 is positioned by a positioning mechanism 8.

[0027] In this embodiment: perfluoropolyether siloxane, propylene glycol and deionized water enter the mixing barrel 2 through three feeding pipes 14, the hydraulic cylinder 5 is started to drive the connecting frame 6 to move, the connecting frame 6 is displaced to drive the barrel cover 3 to move, and the mixing barrel 2 is opened to facilitate the addition of modified sepiolite fiber into the mixing barrel 2; the first motor 9 is started, and the first motor 9 drives the stirring shaft 10 to rotate, and the stirring shaft 10 rotates to stir the materials in the mixing barrel 2; when the materials are discharged, the second motor 16 is started to drive the baffle 15 to rotate, and the discharge port 11 is opened, and then the vacuum pump 13 is started to discharge the materials in the mixing barrel 2.

[0028] Please refer to Figures 1 to 6The docking mechanism 7 includes a docking plate 701, which is rotatably connected to the bottom end of the barrel cover 3, and a first docking block 702 is fixedly connected to the bottom end of the docking plate 701. The output end of the first motor 9 is connected to the docking plate 701. A groove 703 is provided at the top of the mixing barrel 2, and a horizontal plate 704 is slidably connected to the inner wall of the groove 703. A rotating plate 705 is fixedly connected to the top of the mixing shaft 10, and the rotating plate 705 is rotatably connected to the top of the horizontal plate 704. The interior of the horizontal plate 704 is located below the rotating plate 705 and is slidably connected to a movable ring 706. The top of the movable ring 706 is fixedly connected to a second docking block 707 extending to the inside of the rotating plate 705. The rotating plate 705 and A first spring 708 is connected between the movable rings 706, the interior of the horizontal plate 704 is located on one side of the movable ring 706 and is slidably connected to a pushing frame 709, the interior of the horizontal plate 704 is located on the outer wall of the pushing frame 709 and is rotatably connected to a spur gear 710, the interior of the horizontal plate 704 is located on the outer wall of the spur gear 710 and is slidably connected to a lower pressure plate 711, a second spring 712 is connected between the lower pressure plate 711 and the horizontal plate 704, the interior of the horizontal plate 704 is located on one side of the rotating disk 705 and is slidably connected to a positioning block 713, a third spring 714 is connected between the positioning block 713 and the horizontal plate 704, and the outer wall of the pushing frame 709 is located below the positioning block 713 and is fixedly connected to an extrusion rod 715.

[0029] In this embodiment: when the mixing barrel 2 is disassembled and cleaned, the hydraulic cylinder 5 is started to drive the connecting frame 6 to move upward, and the displacement of the connecting frame 6 drives the barrel cover 3 to move upward, and the barrel cover 3 is separated from the mixing barrel 2. Then, the parts in the positioning mechanism 8 cooperate to separate the discharge port 11 and the discharge pipe 12, so that the mixing barrel 2 can be disassembled and cleaned conveniently, and the horizontal plate 704 can be directly moved out of the groove 703 to disassemble the stirring shaft 10, so that the mixing barrel 2 and the stirring shaft 10 can be disassembled and cleaned conveniently; When installing the mixing barrel 2 and the mixing shaft 10, the mixing barrel 2 is placed on the top of the base 1, and the discharge port 11 and the discharge pipe 12 are connected through the cooperation of the parts in the positioning mechanism 8. Then, the cross plate 704 is placed into the groove 703, and the mixing shaft 10 is installed. When the barrel cover 3 moves to close the mixing barrel 2, the docking plate 701 moves to the top of the rotating plate 705. At this time, the barrel cover 3 contacts the lower pressure plate 711, pushing the lower pressure plate 711 to move, squeezing the second spring 712, and the displacement of the lower pressure plate 711 drives the spur gear 710 to rotate, and the rotation of the spur gear 710 drives the push frame 709 to move. The push frame 709 is displaced to push the movable ring 706 to be displaced, and the movable ring 706 is displaced to drive the second docking block 707 to be displaced, and the second docking block 707 moves out of the rotating disk 705 and engages with the first docking block 702, so as to drive the docking disk 701 to rotate when the first motor 9 is running, and the rotation of the docking disk 701 drives the rotating disk 705 to rotate through the first docking block 702 and the second docking block 707, and the rotation of the rotating disk 705 drives the stirring shaft 10 to rotate, so as to facilitate the rapid installation and disassembly of the stirring barrel 2 and the stirring shaft 10, and facilitate the disassembly and cleaning of the stirring barrel 2 and the stirring shaft 10; When the barrel cover 3 is opened, the positioning block 713 is displaced by the elastic force of the third spring 714 and engages with the rotating disk 705 to prevent the rotating disk 705 from rotating and avoid affecting the subsequent docking. When the barrel cover 3 closes the mixing barrel 2, the pushing frame 709 is displaced to drive the squeezing rod 715 to move, and the squeezing rod 715 moves to push the positioning block 713 to move. The positioning block 713 is displaced and separated from the rotating disk 705, so that the rotating disk 705 can rotate.

[0030] Please refer to Figures 7 and 8 The positioning mechanism 8 includes a connecting sleeve 801, which is rotatably connected to the outer wall of the discharge port 11, and the outer wall of the base 1 is rotatably connected to a rotating column 802, one end of the rotating column 802 is fixedly connected to a connecting shaft 803, and one end of the connecting shaft 803 is fixedly connected to a bevel gear 804. The inner part of the base 1 is located at the outer wall of the bevel gear 804 and is rotatably connected to a toothed disc 805, and the top of the toothed disc 805 is fixedly connected to a threaded rod 806, and the inner part of the base 1 is located above the toothed disc 805 and is slidably connected to a displacement plate 807, and the threaded rod 806 penetrates the displacement plate 807, and one side of the displacement plate 807 is fixedly connected to a displacement frame 808, and the top of the displacement frame 808 is fixedly connected to a block 809, and the top of the displacement plate 807 is fixedly connected to a positioning plate 810.

[0031] In this embodiment, when the discharge port 11 and the discharge pipe 12 are connected, the connecting sleeve 801 is rotated to tightly cover the outer wall of the discharge pipe 12, so that the discharge port 11 and the discharge pipe 12 are fixedly connected, and then the rotating column 802 is rotated, the rotating column 802 rotates to drive the connecting shaft 803 to rotate, the connecting shaft 803 rotates to drive the bevel gear 804 to rotate, the bevel gear 804 rotates to drive the toothed disc 805 to rotate, the toothed disc 805 rotates to drive the threaded rod 806 to rotate, and the threaded rod 806 rotates to drive the position The displacement plate 807 is displaced, and the displacement of the displacement plate 807 drives the displacement frame 808 to be displaced, and the displacement of the displacement frame 808 drives the clamping block 809 to be displaced, and the clamping block 809 is displaced and engaged with the connecting sleeve 801, so as to fix the connecting sleeve 801 to prevent loosening between the discharge port 11 and the discharge pipe 12. At the same time, the displacement of the displacement plate 807 drives the positioning plate 810 to be displaced, and the positioning plate 810 moves out of the base 1, and the positioning plate 810 is attached to the outer wall of the mixing barrel 2 to position the mixing barrel 2 to prevent the mixing barrel 2 from shifting.

[0032] Please refer to Figures 3 to 6 The outer walls of the lower pressing plate 711 and the pushing frame 709 are both provided with tooth grooves, the tooth grooves are meshed with the spur gear 710, and the first docking block 702 is engaged with the second docking block 707.

[0033] In this embodiment: when the barrel cover 3 moves to close the mixing barrel 2, the docking disk 701 moves to the top of the rotating disk 705. At this time, the barrel cover 3 contacts the lower pressure plate 711, pushing the lower pressure plate 711 to move, causing compression on the second spring 712. The displacement of the lower pressure plate 711 drives the spur gear 710 to rotate, and the rotation of the spur gear 710 drives the pushing frame 709 to move.

[0034] Please refer to Figures 5 and 6 The outer wall of the rotating disk 705 is provided with first slots distributed circumferentially, and one end of the positioning block 713 is engaged with the first slot.

[0035] In this embodiment, when the barrel cover 3 is opened, the positioning block 713 is displaced by the elastic force of the third spring 714 to engage with the rotating disk 705 to prevent the rotating disk 705 from rotating.

[0036] Please refer to Figures 5 and 6 The bottom end of the positioning block 713 is provided with an inclined surface, and the squeezing rod 715 is located below the inclined surface.

[0037] In this embodiment, when the barrel cover 3 closes the mixing barrel 2, the pushing frame 709 moves to drive the squeezing rod 715 to move, and the squeezing rod 715 moves to drive the positioning block 713 to move, and the positioning block 713 moves and separates from the rotating disk 705, so that the rotating disk 705 can rotate.

[0038] Please refer to Figures 7 and 8 The outer wall of the toothed disc 805 is provided with gear teeth meshing with the bevel gear 804 , and the outer wall of the displacement plate 807 is provided with a threaded hole, which matches the threaded rod 806 .

[0039] In this embodiment: the rotation of the rotating column 802 drives the connecting shaft 803 to rotate, the rotation of the connecting shaft 803 drives the bevel gear 804 to rotate, the rotation of the bevel gear 804 drives the toothed disc 805 to rotate, the rotation of the toothed disc 805 drives the threaded rod 806 to rotate, the rotation of the threaded rod 806 drives the displacement plate 807 to displace, the displacement of the displacement plate 807 drives the displacement frame 808 to displace, the displacement of the displacement frame 808 drives the block 809 to displace.

[0040] Please refer to Figures 7 and 8 The inner wall of the connecting sleeve 801 is provided with an internal thread, and one end of the discharge pipe 12 is provided with an external thread, the internal thread matches the external thread, and a second slot is provided on the circumference of the outer wall of the connecting sleeve 801, and the top of the block 809 is engaged with the second slot.

[0041] In this embodiment: the connecting sleeve 801 is rotated and tightly sleeved on the outer wall of the discharge pipe 12, so that the discharge port 11 and the discharge pipe 12 are fixedly connected, and the clamping block 809 is displaced to engage with the connecting sleeve 801, so as to fix the connecting sleeve 801.

[0042] Example 2: Preparation of modified sepiolite fiber reinforced rubber asphalt A modified sepiolite fiber reinforced rubber asphalt is prepared from the following components in parts by weight: 65 parts of No. 90 base asphalt; 25 parts of modified sepiolite fiber; Styrene butadiene rubber SBR 1502E 20 parts; 6 parts of perfluoropolyether siloxane; 5 parts of sodium dodecylbenzene sulfonate; 1 part of tert-butylhydroquinone; 3 parts of polyvinyl pyrrolidone; 4 parts of glycerol; 15 parts of deionized water.

[0043] The preparation method comprises the following steps: S1: Pretreatment of sepiolite: Place the sepiolite fiber powder in a drying oven at 105°C, take it out after 24 hours, put it in a drying boat and cool it to room temperature, pass it through a 95-mesh sieve and put it into a sealed desiccator for storage; take an appropriate amount of the sepiolite fiber after the above drying treatment, add 10% ferrous sulfate solution at a solid-liquid ratio of 1.5:10, mix it, place it in a constant temperature shaker and oscillate it at room temperature for 24 hours, and centrifuge and wash it until the upper liquid does not contain Fe 2+ The bottom solid was then dried in an oven at 105°C, ground, passed through a 100-mesh sieve, placed in a sealed bag and stored in a desiccator.

[0044] S2: Preparation of modified sepiolite fiber: Add a proportion of perfluoropolyether siloxane, propylene glycol and deionized water into a microwave chemical reactor, hydrolyze at 80°C for 30 minutes under a microwave power of 500 W, then add the modified sepiolite fiber prepared in step S1, stir at 80°C for 1 hour, let stand and cool to room temperature, and filter. The obtained product is dried at 80°C for 4 hours and then ground to obtain the modified sepiolite fiber.

[0045] S3: Preparation of modified sepiolite fiber reinforced rubber asphalt: After heating the base asphalt to 160°C, add the modified sepiolite fiber prepared in step S2 and sodium dodecylbenzene sulfonate, tert-butylhydroquinone, and polyvinyl pyrrolidone in a certain proportion, and use a high-speed shearing machine to shear at a speed of 1000 rpm for 15 minutes; cool to 105°C, add styrene-butadiene rubber, and continue stirring for 5 minutes to obtain modified sepiolite fiber reinforced rubber asphalt.

[0046] The preparation and application equipment are the same as those in Example 1 and will not be described in detail here.

[0047] Example 3: Preparation of modified sepiolite fiber reinforced rubber asphalt A modified sepiolite fiber reinforced rubber asphalt is prepared from the following components in parts by weight: 45 parts of No. 90 base asphalt; 30 parts of modified sepiolite fiber; Styrene butadiene rubber SBR 1502E 25 parts; 8 parts of perfluoropolyether siloxane; 2 parts of sodium dodecylbenzene sulfonate; 5 parts of tert-butylhydroquinone; 2 parts of polyvinyl pyrrolidone; 5 parts of glycerol; 13 parts of deionized water.

[0048] The preparation method comprises the following steps: S1: Pretreatment of sepiolite: Place the sepiolite fiber powder in a drying oven at 110°C, take it out after 24 hours, put it in a drying boat and cool it to room temperature, pass it through a 100-mesh sieve, and store it in a sealed desiccator for later use; Take an appropriate amount of the dried sepiolite and add a 10% ferrous sulfate solution at a solid-liquid ratio of 1.5:10, mix it, place it in a constant temperature shaker and oscillate it at room temperature for 24 hours, and centrifuge and wash it until the upper liquid does not contain Fe 2+ The bottom solid was then dried in an oven at 105°C, ground, passed through a 100-mesh sieve, placed in a sealed bag and stored in a desiccator.

[0049] S2: Preparation of modified sepiolite fiber: Add a proportion of perfluoropolyether siloxane, propylene glycol and deionized water into a microwave chemical reactor, hydrolyze at 80°C for 20 min under a microwave power of 800 W, then add the modified sepiolite fiber prepared in step S1, stir at 75°C for 1 h, let stand and cool to room temperature, and filter. The obtained product is dried at 80°C for 4 h and then ground to obtain the modified sepiolite fiber.

[0050] S3: Preparation of modified sepiolite fiber reinforced rubber asphalt: After heating the base asphalt to 170°C, add the modified sepiolite fiber prepared in step S2 and sodium dodecylbenzene sulfonate, tert-butylhydroquinone, and polyvinyl pyrrolidone in a certain proportion, and use a high-speed shearing machine to shear at a speed of 1500 rpm for 10 minutes; cool to 110°C, add styrene-butadiene rubber, and continue stirring for 10 minutes to obtain modified sepiolite fiber reinforced rubber asphalt.

[0051] The preparation and application equipment are the same as those in Example 1 and will not be described in detail here.

[0052] Road performance test: According to the method specified in the "Highway Engineering Asphalt and Asphalt Mixture Test Procedure", the asphalt mixture prepared in Examples 1-3 was marked as Sample 1-3 and tested for road performance with No. 70 base asphalt. The results are shown in Table 1: Table 1 Road performance test

[0053] The test results show that the high and low temperature performance, aging resistance and mechanical properties of the modified sepiolite fiber reinforced rubber asphalt road base asphalt of the present invention are significantly better than those of ordinary asphalt mixtures, and meet the requirements of the test procedures for highway engineering asphalt and asphalt mixtures.

[0054] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A modified sepiolite fiber reinforced rubber asphalt, characterized in that: Made from the following components in parts by weight: 45-65 parts of base asphalt; 20-30 parts of modified sepiolite fiber; 15-25 parts of styrene-butadiene rubber; 4-8 parts of perfluoropolyether siloxane; 2-5 parts of sodium dodecylbenzene sulfonate; 1-5 parts of tert-butylhydroquinone; Polyvinyl pyrrolidone 2-3 parts; 3-5 parts of glycerol; 10-15 parts of deionized water.

2. A method for preparing the modified sepiolite fiber reinforced rubber asphalt as claimed in claim 1, characterized in that: The steps include: Step 1: Pretreatment of sepiolite fiber: put the sepiolite fiber powder in a proportion into an oven, dry it at 95-110°C, take it out after 24 hours, put it into a drying boat and cool it to room temperature, pass it through a 90-100 mesh sieve, put it into a sealed dryer and store it for later use; take the sepiolite fiber after the above drying treatment, add 10% ferrous sulfate solution at a solid-liquid ratio of 1-1.5:10, mix it, place it in a constant temperature shaker and oscillate it at room temperature for 24 hours, and centrifuge and wash it until the upper liquid does not contain Fe 2+ ; The bottom solid was then dried in an oven at 105°C, ground, passed through a 100-mesh sieve, placed in a sealed bag and stored in a desiccator; Step 2: preparing modified sepiolite fiber: adding a proportion of perfluoropolyether siloxane, propylene glycol and deionized water into a microwave chemical reactor, hydrolyzing at 80°C for 10 to 30 minutes at a microwave power of 100 to 800 W, then adding the modified sepiolite fiber prepared in step S1, stirring at 70 to 80°C for 1 hour, standing and cooling to room temperature, and filtering. The obtained product is dried at 80°C for 4 hours and then ground to obtain the modified sepiolite fiber; Step 3: Prepare modified sepiolite fiber reinforced rubber asphalt: After heating the base asphalt to 160-170°C, add the modified sepiolite fiber prepared in step S2 and sodium dodecylbenzene sulfonate, tert-butylhydroquinone, and polyvinyl pyrrolidone in a certain proportion, and use a high-speed shearing machine for shearing at a speed of 1000-1500 rpm for a shearing time of 10-15 minutes; cool to 100-110°C, add styrene-butadiene rubber, and continue stirring for 5-10 minutes to obtain modified sepiolite fiber reinforced rubber asphalt.

3. A method for preparing modified sepiolite fiber reinforced rubber asphalt according to claim 2, characterized in that: The microwave chemical reactor used in step 2 comprises a base (1), a stirring barrel (2) is arranged at the top of the base (1), a barrel cover (3) is arranged at the top of the stirring barrel (2), a mounting frame (4) is fixedly connected to the top of the base (1) located on one side of the stirring barrel (2), a hydraulic cylinder (5) is installed at the top of the mounting frame (4), an output end of the hydraulic cylinder (5) is connected to a connecting frame (6), the connecting frame (6) is fixedly connected to the barrel cover (3), a first motor (9) and three feeding pipes (14) are installed at the top of the barrel cover (3), a stirring shaft (10) is arranged in the inner cavity of the stirring barrel (2), and one side of the stirring barrel (2) is provided with a stirring shaft (10). A discharge port (11) is fixedly connected, one end of the discharge port (11) is connected to a discharge pipe (12), a vacuum pump (13) is installed on the outer wall of the discharge pipe (12), and the vacuum pump (13) is installed on the top of the base (1). The inner cavity of the discharge port (11) is rotatably connected to a baffle (15), a second motor (16) is installed at the bottom end of the discharge port (11), and the output end of the second motor (16) is connected to the baffle (15). A microwave heater (17) is installed on the outer wall of the stirring barrel (2), the stirring shaft (10) is installed by means of a docking mechanism (7), and the position of the stirring barrel (2) is positioned by means of a positioning mechanism (8).

4. The method for preparing modified sepiolite fiber reinforced rubber asphalt according to claim 3, characterized in that: The docking mechanism (7) comprises a docking plate (701), the docking plate (701) being rotatably connected to the bottom end of the barrel cover (3), the bottom end of the docking plate (701) being fixedly connected to a first docking block (702), the output end of the first motor (9) being connected to the docking plate (701), the top end of the mixing barrel (2) being provided with a groove (703), the inner wall of the groove (703) being slidably connected to a transverse plate (704), the top end of the mixing shaft (10) being fixedly connected to a rotating plate (705), the rotating plate (705) being rotatably connected to the top end of the transverse plate (704), the interior of the transverse plate (704) being located below the rotating plate (705) being slidably connected to a movable ring (706), the top end of the movable ring (706) being fixedly connected to a second docking block (707) extending to the inside of the rotating plate (705), the rotating plate (705) A first spring (708) is connected to the movable ring (706); the interior of the transverse plate (704) is located at one side of the movable ring (706) and is slidably connected to a pushing frame (709); the interior of the transverse plate (704) is located at the outer wall of the pushing frame (709) and is rotatably connected to a spur gear (710); the interior of the transverse plate (704) is located at the outer wall of the spur gear (710) and is slidably connected to a lower pressure plate (711); a second spring (712) is connected between the lower pressure plate (711) and the transverse plate (704); the interior of the transverse plate (704) is located at one side of the rotating disk (705) and is slidably connected to a positioning block (713); a third spring (714) is connected between the positioning block (713) and the transverse plate (704); and the outer wall of the pushing frame (709) is located below the positioning block (713) and is fixedly connected to an extrusion rod (715).

5. A method for preparing modified sepiolite fiber reinforced rubber asphalt according to claim 4, characterized in that: The positioning mechanism (8) comprises a connecting sleeve (801), the connecting sleeve (801) being rotatably connected to the outer wall of the discharge port (11), the outer wall of the base (1) being rotatably connected to a rotating column (802), one end of the rotating column (802) being fixedly connected to a connecting shaft (803), one end of the connecting shaft (803) being fixedly connected to a bevel gear (804), a toothed disc (805) being rotatably connected to the outer wall of the bevel gear (804) inside the base (1), a threaded rod (806) being fixedly connected to the top of the toothed disc (805), a displacement plate (807) being slidably connected to the inside of the base (1) above the toothed disc (805), the threaded rod (806) penetrating the displacement plate (807), a displacement frame (808) being fixedly connected to one side of the displacement plate (807), a clamping block (809) being fixedly connected to the top of the displacement frame (808), and a positioning plate (810) being fixedly connected to the top of the displacement plate (807).

6. The method for preparing modified sepiolite fiber reinforced rubber asphalt according to claim 4, characterized in that: The outer walls of the lower pressing plate (711) and the pushing frame (709) are both provided with tooth grooves, the tooth grooves are meshed with the spur gear (710), and the first docking block (702) is engaged with the second docking block (707).

7. The method for preparing modified sepiolite fiber reinforced rubber asphalt according to claim 4, characterized in that: The outer wall of the rotating disk (705) is provided with first slots distributed in a circumference, and one end of the positioning block (713) is engaged with the first slots.

8. The method for preparing modified sepiolite fiber reinforced rubber asphalt according to claim 4, characterized in that: The bottom end of the positioning block (713) is provided with an inclined surface, and the squeezing rod (715) is located below the inclined surface.

9. The method for preparing modified sepiolite fiber reinforced rubber asphalt according to claim 5, characterized in that: The outer wall of the toothed disc (805) is provided with gear teeth meshing with the bevel gear (804), and the outer wall of the displacement plate (807) is provided with a threaded hole, which matches the threaded rod (806).

10. The method for preparing modified sepiolite fiber reinforced rubber asphalt according to claim 5, characterized in that: The inner wall of the connecting sleeve (801) is provided with an internal thread, and one end of the discharge pipe (12) is provided with an external thread, the internal thread matches the external thread, and a second groove is provided on the circumference of the outer wall of the connecting sleeve (801), and the top end of the clamping block (809) is engaged with the second groove.

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