A modified asphalt graphene concentrate production device

Abstract

The utility model discloses a kind of graphene concentrated solution manufacturing equipment for modified asphalt, manufacturing equipment includes first mixed stirring mechanism, ultrasonic oscillation mechanism, grinding mechanism and second mixed stirring mechanism, first mixed stirring mechanism is connected with ultrasonic oscillation mechanism, ultrasonic oscillation mechanism is connected with grinding mechanism, grinding mechanism is connected with second mixed stirring mechanism.The utility model is through the synergic dispersion of mixed stirring and multistage ultrasonic oscillation, gradually promote the dispersion of graphene, effectively peel graphene microsheet aggregate, form uniform stable graphene concentrated solution, and each mechanism is connected in series, integration is high, can realize continuous production, reduce material transfer link, reduce pollution risk, improve efficiency, ensure that the high stability and compatibility of prepared concentrated solution with asphalt, concentrated solution is evenly dispersed, without aggregation, when used for modified asphalt, can significantly improve its crack resistance, high-temperature resistance and durability, satisfy high-grade road engineering demand.

Description

Technical Field

[0001] This utility model relates to the field of graphene concentrate preparation technology, and in particular to a device for producing graphene concentrate for modified asphalt. Background Technology

[0002] In recent years, graphene has shown great promise in the field of modified asphalt due to its excellent mechanical, thermal, and electrical properties. However, the uniform dispersion of graphene in asphalt remains a technical challenge. Current technologies typically employ simple mechanical stirring methods to prepare graphene concentrates, but this method suffers from the following problems:

[0003] 1. Poor dispersion effect: Traditional mechanical stirring is difficult to effectively remove the agglomerated structure of graphene micro flakes, resulting in uneven distribution of graphene in the concentrate and affecting the performance of modified asphalt.

[0004] 2. Low process efficiency: Traditional mechanical stirring requires repeated operations to improve the dispersion effect, which is time-consuming and energy-intensive.

[0005] 3. Insufficient stability: The concentrate is prone to secondary agglomeration when mixed with asphalt, which reduces the uniformity and durability of the final product.

[0006] Therefore, there is an urgent need to develop an efficient and stable equipment and process to solve the problem of graphene dispersion in asphalt and improve the overall performance of modified asphalt. Utility Model Content

[0007] The purpose of this invention is to provide a graphene concentrate preparation device for modified asphalt, which addresses the above-mentioned problems by using a multi-stage ultrasonic oscillation of a mixing mixer to gradually increase the dispersion of graphene, effectively exfoliating graphene micro-flake aggregates and forming a uniform and stable graphene concentrate.

[0008] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0009] According to one aspect of the present invention, a device for producing graphene concentrate for modified asphalt is provided, comprising a first mixing and stirring mechanism, an ultrasonic vibration mechanism, a grinding mechanism, and a second mixing and stirring mechanism.

[0010] The first mixing and stirring mechanism is connected to the ultrasonic oscillation mechanism, the ultrasonic oscillation mechanism is connected to the grinding mechanism, and the grinding mechanism is connected to the second mixing and stirring mechanism;

[0011] The first mixing and stirring mechanism is used to mix and stir the coupling agent and graphene microsheets to obtain a primary dispersion;

[0012] The ultrasonic oscillation mechanism is used to oscillate and disperse the primary dispersion to obtain a second-stage dispersion.

[0013] The grinding mechanism is used to grind the secondary dispersion to obtain a tertiary dispersion;

[0014] The second mixing and stirring mechanism is used to mix and stir the rubber oil and the tertiary dispersion to obtain a graphene concentrate.

[0015] Preferably, the first mixing and stirring mechanism includes a first stirring box, a first stirring motor, a main rotating pipe, and a stirring branch pipe;

[0016] The first stirring motor is fixedly installed at the upper end of the first stirring box, the rotating main pipe is installed inside the first stirring box, the upper end of the rotating main pipe is fixedly connected to the first stirring motor, the lower end of the rotating main pipe is rotatably connected to the bottom of the first stirring box, and multiple stirring branch pipes are provided, which are staggered along the axial direction of the rotating main pipe, and each stirring branch pipe is connected to the rotating main pipe.

[0017] Preferably, it further includes a pneumatic assembly, which includes an air compressor, an air guide pipe, and an electric valve. One end of the air guide pipe is connected to the air compressor, and the other end is connected to the rotating main pipe through a sealed bearing. The outer ring of the sealed bearing is fixedly disposed at the bottom of the first mixing tank body. The rotating main pipe is fixedly connected to the inner ring of the sealed bearing, and the air guide pipe is fixedly connected to the outer ring of the sealed bearing. The air guide pipe communicates with the rotating main pipe.

[0018] Preferably, the ultrasonic oscillation mechanism includes a plurality of ultrasonic oscillation devices connected in sequence. Each ultrasonic oscillation device includes an ultrasonic oscillation chamber, an ultrasonic generator, a transducer, and an amplitude transformer. The transducer and the amplitude transformer are both disposed in the ultrasonic oscillation chamber. The ultrasonic generator is connected to the transducer, and the transducer is connected to the amplitude transformer.

[0019] Preferably, the grinding mechanism includes a grinding chamber, a grinding motor, a main shaft, and a disc. The grinding motor is fixedly disposed at one end of the grinding chamber. The main shaft and the disc are both disposed within the grinding chamber. One end of the main shaft is fixedly connected to the grinding motor. Multiple discs are provided, and the multiple discs are fixedly disposed at intervals along the axial direction of the main shaft.

[0020] Preferably, the second mixing mechanism includes a second mixing chamber, a second mixing motor, a rotating shaft, and spiral blades. The second mixing motor is fixedly mounted on the upper end of the second mixing chamber, the rotating shaft and the spiral blades are mounted inside the second mixing chamber, the rotating shaft is fixedly connected to the output end of the second mixing motor, and the spiral blades are fixedly mounted on the rotating shaft.

[0021] Preferably, a method for preparing a graphene concentrate for modified asphalt includes the following steps:

[0022] S1. The coupling agent and graphene microsheets are added to the first mixing and stirring mechanism for mixing and stirring to obtain the first-stage dispersion;

[0023] S2. The first-stage dispersion is put into the ultrasonic oscillation mechanism for ultrasonic oscillation, and the oscillation is repeated 8-11 times to obtain the second-stage dispersion.

[0024] S3. The second-stage dispersion is fed into the grinding mechanism for grinding to obtain the third-stage dispersion.

[0025] S4. The third dispersion and rubber oil are added to the second mixing and stirring mechanism for mixing and stirring to obtain graphene concentrate for modified asphalt.

[0026] Preferably, in step S1, the coupling agent is a titanate coupling agent or a silane coupling agent.

[0027] Preferably, in step S1, the proportions of the coupling agent and the graphene microplates are: 77-94 parts of coupling agent and 6-23 parts of graphene microplates.

[0028] Preferably, in step S4, the viscosity of the rubber oil is: 40 ≤ viscosity ≤ 100.

[0029] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0030] This invention utilizes multi-stage ultrasonic vibration in a mixing mixer to progressively increase the dispersion of graphene, effectively exfoliating graphene micro-flake agglomerates and forming a uniform and stable graphene concentrate. Furthermore, the interconnected components ensure high integration, enabling continuous production, reducing material transfer steps, minimizing pollution risks, and improving efficiency. This guarantees the high stability and compatibility of the prepared concentrate with asphalt. The resulting graphene concentrate is uniformly dispersed and free of agglomerates. When used to modify asphalt, it significantly improves its crack resistance, high-temperature resistance, and durability, meeting the requirements of high-grade road engineering. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0032] Figure 2 This is a schematic diagram of the structure of the first mixing and stirring mechanism of this utility model;

[0033] Figure 3 This is a schematic diagram of the ultrasonic oscillation mechanism of this utility model;

[0034] Figure 4 This is a schematic diagram of the grinding mechanism of this utility model;

[0035] Figure 5 This is a schematic diagram of the structure of the second mixing and stirring mechanism of this utility model.

[0036] In the attached diagram, 1 is the first mixing and stirring mechanism; 2 is the ultrasonic oscillation mechanism; 3 is the grinding mechanism; 4 is the second mixing and stirring mechanism; 100 is the first mixing chamber; 101 is the first stirring motor; 102 is the main rotating pipe; 103 is the stirring branch pipe; 104 is the aeration hole; 105 is the air guide pipe; 200 is the ultrasonic oscillation chamber; 201 is the transducer; 202 is the amplitude transformer; 300 is the grinding chamber; 301 is the grinding motor; 302 is the main shaft; 303 is the disc; 400 is the second mixing chamber; 401 is the second stirring motor; 402 is the rotating shaft; and 403 is the spiral blade. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of the utility model, and these aspects can be achieved even without these specific details.

[0038] Please see Figures 1 to 5 This utility model provides a device for producing graphene concentrate for modified asphalt, the technical solution of which is as follows:

[0039] A graphene concentrate preparation device for modified asphalt includes a first mixing mechanism 1, an ultrasonic vibration mechanism 2, a grinding mechanism 3, and a second mixing mechanism 4. The first mixing mechanism 1 includes a first mixing chamber 100, a first mixing motor 101, a rotating main pipe 102, and mixing branch pipes 103. The first mixing motor 101 is fixedly mounted on the upper end of the first mixing chamber 100, and the rotating main pipe 102 is disposed inside the first mixing chamber 100. The upper end of the rotating main pipe 102 is fixedly connected to the first mixing motor 101, and the lower end of the rotating main pipe 102 is rotatably connected to the bottom of the first mixing chamber 100. Multiple mixing branch pipes 103 are provided, and the multiple mixing branch pipes 103 are staggered along the axial direction of the rotating main pipe, with each mixing branch pipe 103 connected to the rotating main pipe 102. The first stirring motor 101 drives the rotating tube to rotate, which in turn drives the stirring branch pipe 103 to rotate. The stirring branch pipe 103 stirs the mixture of coupling agent and graphene micro-flakes put into the first stirring box 100, accelerating the mixing reaction of coupling agent and graphene micro-flakes and promoting the dispersion of graphene micro-flakes.

[0040] Furthermore, to further enhance the mixing effect, this embodiment also includes a pneumatic assembly. The pneumatic assembly includes an air compressor, an air guide pipe 105, and an electric valve. One end of the air guide pipe 105 is connected to the air compressor, and the other end is connected to the rotating main pipe 102 via a sealed bearing. The outer ring of the sealed bearing is fixedly disposed at the bottom of the first mixing chamber 100. The lower end of the rotating main pipe 102 is fixedly connected to the inner ring of the sealed bearing, and the inner ring communicates with the rotating main pipe 102. The end of the air guide pipe 105 furthest from the air compressor is fixedly connected to the outer ring of the sealed bearing, and the air guide pipe 105 communicates with the rotating main pipe 102. Multiple aeration holes 104 are provided along the axial direction of the mixing branch pipe 103, and the mixing branch pipe 103 communicates with the rotating main pipe 102. Air is compressed by an air compressor and then released through an air duct 105. The compressed air passes through a rotating main pipe 102 and a stirring branch pipe 103 and is sprayed out through an aeration hole 104. The sprayed gas, in conjunction with the rotating stirring branch pipe 103, enhances the stirring effect, improves the stirring efficiency, and enhances the dispersibility of graphene.

[0041] The ultrasonic oscillation mechanism 2 includes multiple ultrasonic oscillation devices connected in sequence. In this embodiment, five ultrasonic oscillation devices are provided and connected in sequence. Each ultrasonic oscillation device includes an ultrasonic oscillation housing 200, an ultrasonic generator, a transducer 201, and an amplitude transformer 202. The ultrasonic oscillation housing 200 of the first ultrasonic oscillation device is connected to the first mixing tank 100 via a pipe, and the ultrasonic oscillation housing 200 is used to receive the primary stirred mixture from the first mixing tank 100. The ultrasonic oscillation housing 200 of the second ultrasonic oscillation device is connected to the ultrasonic oscillation housing 200 of the first ultrasonic oscillation device via a pipe, and a valve is provided on the pipe, and so on, until all five ultrasonic oscillation devices are connected in sequence. The transducer 201 and the amplitude transformer 202 are both disposed inside the ultrasonic oscillation housing 200. The ultrasonic generator is connected to the transducer 201, and the transducer 201 is connected to the amplitude transformer 202. The ultrasonic generator is used to convert mains power into a high-frequency electrical signal. Transducer 201, made of piezoelectric ceramic (such as PZT) or magnetostrictive material, is used to convert electrical energy into mechanical vibration. Amplifier rod 202 amplifies the amplitude of transducer 201. The number of transducers 201 and amplifier rods 202 in each ultrasonic oscillation chamber 200 can be set according to actual needs, ranging from 1 to 30. High-frequency ultrasonic vibration causes periodic compression and expansion in the liquid, forming microbubbles. The instantaneous collapse of these bubbles generates localized high temperature, high pressure, and high-speed microjets. Cavitation shock waves directly impact the graphene sheets, peeling away the stacked structure. The high-pressure jet penetrates the interlayers of graphene, overcoming van der Waals forces. Furthermore, the high-frequency ultrasonic vibration in the liquid creates turbulence, applying shear stress to the graphene, tearing multilayer graphene into single-layer or few-layer structures, preventing secondary aggregation of the peeled graphene. Simultaneously, part of the ultrasonic energy is converted into heat energy; moderate heating can reduce liquid viscosity, improve solvent molecule permeability, accelerate the peeling process, and promote surfactant adsorption.

[0042] The grinding mechanism 3 is a sand mill, which includes a grinding chamber 300, a grinding motor 301, a main shaft 302, and a disc 303. The grinding chamber 300 is connected to the ultrasonic vibration chamber 200 of the last ultrasonic vibration device in the ultrasonic vibration mechanism 2 via a pipe, and is used to receive the secondary vibration mixture from the ultrasonic vibration chamber 200. The grinding motor 301 is fixedly installed at one end of the grinding chamber 300. The main shaft 302 and the disc 303 are both installed inside the grinding chamber 300. One end of the main shaft 302 is fixedly connected to the grinding motor 301. Multiple discs 303 are provided and are fixedly spaced along the axial direction of the main shaft 302. By adding grinding media into the grinding chamber 300, and then using the grinding motor 301 to drive the spindle 302 to rotate, the spindle 302 drives the disk 303 to rotate, so that the secondary oscillating mixture can be effectively ground in the grinding chamber 300. The high-speed shear force breaks the agglomeration of graphene microflakes, making them uniformly dispersed in the matrix, promoting the coating of coupling agent on the graphene surface, enhancing interfacial bonding, achieving nanoscale uniform distribution of coupling agent and graphene, and avoiding local concentration differences.

[0043] The product of the grinding mill is a three-stage grinding mixture. To improve dispersibility, the three-stage grinding mixture can be returned to the first mixing and stirring mechanism 1, the ultrasonic oscillation mechanism 2, and the grinding mechanism 3 for repeated processing, thereby ensuring complete dispersion of the graphene microsheets. It should be noted that the first mixing and stirring mechanism 1, the ultrasonic oscillation mechanism 2, and the grinding mechanism 3 are all connected by pipes, and pumps are installed on the pipes for material transfer between the mechanisms and for repeated action between the mechanisms.

[0044] The second mixing and stirring mechanism 4 includes a second mixing chamber 400, a second stirring motor 401, a rotating shaft 402, and a spiral blade 403. The second mixing chamber 400 is connected to the grinding chamber 300 and is used to receive the three-stage grinding mixture and simultaneously receive the added rubber oil. The second stirring motor 401 is fixedly installed at the upper end of the second mixing chamber 400. The rotating shaft 402 and the spiral blade 403 are installed inside the second mixing chamber 400. The rotating shaft 402 is fixedly connected to the output end of the second stirring motor 401, and the spiral blade 403 is fixedly installed on the rotating shaft 402. After adding rubber oil to the three-stage grinding mixture, the two are mixed and stirred by the second mixing and stirring mechanism 4 to ensure that the graphene microsheets are uniformly dispersed in the viscous rubber oil, avoiding agglomeration, shortening the mixing time, improving the interfacial bonding effect and stability between the coupling agent and graphene, and preventing leakage and volatilization. After stirring by the second mixing and stirring mechanism 4, a graphene concentrate for modified asphalt can be obtained.

[0045] This utility model also discloses a method for preparing a graphene concentrate for modified asphalt, the method comprising the following steps:

[0046] S1. The coupling agent and graphene microsheets are added to the first mixing and stirring mechanism 1 for mixing and stirring to obtain the first-stage dispersion.

[0047] Specifically, the coupling agent is a silane coupling agent. 50 kg of silane coupling agent and 15 kg of graphene microsheets are placed in the first mixing and stirring tank. The first mixing and stirring mechanism 1 stirs the mixed coupling agent and graphene microsheets to ensure a complete reaction, obtaining a first-stage dispersion. The silane coupling agent, through hydrolysis, generates silanol groups that combine with oxygen-containing functional groups on the graphene surface, forming chemical bonds or physical adsorption, reducing graphene aggregation. This improves the uniform dispersion of graphene in polymers, coatings, and other matrices, enhancing the uniformity of the composite material. The organic functional groups of silane react with the matrix, forming bridges and improving the interfacial strength between graphene and the matrix.

[0048] S2. The first-stage dispersion is put into the ultrasonic oscillation mechanism 2 for ultrasonic oscillation, and the oscillation is repeated 8-11 times to obtain the second-stage dispersion.

[0049] S3. The second-stage dispersion is fed into the grinding mechanism 3 for grinding to obtain the third-stage dispersion.

[0050] S4. The third dispersion and rubber oil are added to the second mixing and stirring mechanism 4 for mixing and stirring to obtain graphene concentrate for modified asphalt.

[0051] Specifically, the third dispersion and rubber oil are added to the second mixing and stirring mechanism 4 for mixing and stirring. The viscosity of the rubber oil is greater than or equal to 40 and less than or equal to 100. By mixing the rubber oil and the third dispersion, the graphene microsheets are ensured to be uniformly dispersed in the viscous rubber oil, avoiding agglomeration, shortening the mixing time, improving the interfacial bonding effect and stability between the coupling agent and graphene, and preventing leakage and volatilization.

[0052] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A device for producing graphene concentrate for modified asphalt, characterized in that, It includes a first mixing and stirring mechanism, an ultrasonic oscillation mechanism, a grinding mechanism, and a second mixing and stirring mechanism; The first mixing and stirring mechanism is connected to the ultrasonic oscillation mechanism, the ultrasonic oscillation mechanism is connected to the grinding mechanism, and the grinding mechanism is connected to the second mixing and stirring mechanism; The first mixing and stirring mechanism is used to mix and stir the coupling agent and graphene microsheets to obtain a primary dispersion; The ultrasonic oscillation mechanism is used to oscillate and disperse the primary dispersion to obtain a second-stage dispersion. The grinding mechanism is used to grind the secondary dispersion to obtain a tertiary dispersion; The second mixing and stirring mechanism is used to mix and stir the rubber oil and the tertiary dispersion to obtain a graphene concentrate.

2. The equipment for producing graphene concentrate for modified asphalt according to claim 1, characterized in that: The first mixing mechanism includes a first mixing chamber, a first mixing motor, a main rotating pipe, and a mixing branch pipe; The first stirring motor is fixedly installed at the upper end of the first stirring box, the rotating main pipe is installed inside the first stirring box, the upper end of the rotating main pipe is fixedly connected to the first stirring motor, the lower end of the rotating main pipe is rotatably connected to the bottom of the first stirring box, and multiple stirring branch pipes are provided, which are staggered along the axial direction of the rotating main pipe, and each stirring branch pipe is connected to the rotating main pipe.

3. The equipment for producing graphene concentrate for modified asphalt according to claim 2, characterized in that: It also includes a pneumatic assembly, which includes an air compressor, an air guide pipe, and an electric valve. One end of the air guide pipe is connected to the air compressor, and the other end is connected to the rotating main pipe through a sealed bearing. The outer ring of the sealed bearing is fixedly disposed at the bottom of the first mixing tank body. The rotating main pipe is fixedly connected to the inner ring of the sealed bearing. The air guide pipe is fixedly connected to the outer ring of the sealed bearing and communicates with the rotating main pipe.

4. The equipment for producing graphene concentrate for modified asphalt according to claim 2, characterized in that: The ultrasonic oscillation mechanism includes multiple ultrasonic oscillation devices connected in sequence. Each ultrasonic oscillation device includes an ultrasonic oscillation chamber, an ultrasonic generator, a transducer, and an amplitude transformer. The transducer and the amplitude transformer are both disposed inside the ultrasonic oscillation chamber. The ultrasonic generator is connected to the transducer, and the transducer is connected to the amplitude transformer.

5. The equipment for producing graphene concentrate for modified asphalt according to claim 1, characterized in that: The grinding mechanism includes a grinding chamber, a grinding motor, a main shaft, and a disc. The grinding motor is fixedly disposed at one end of the grinding chamber. The main shaft and the disc are both disposed inside the grinding chamber. One end of the main shaft is fixedly connected to the grinding motor. Multiple discs are disposed at intervals along the axial direction of the main shaft.

6. The equipment for producing graphene concentrate for modified asphalt according to claim 1, characterized in that: The second mixing mechanism includes a second mixing chamber, a second mixing motor, a rotating shaft, and spiral blades. The second mixing motor is fixedly installed at the upper end of the second mixing chamber. The rotating shaft and the spiral blades are installed inside the second mixing chamber. The rotating shaft is fixedly connected to the output end of the second mixing motor, and the spiral blades are fixedly installed on the rotating shaft.

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