Graphene spinning apparatus and spinning method

Abstract

The application relates to the technical field of graphene spinning, and discloses graphene spinning equipment and a spinning method, which comprise a conveying belt, a spraying mechanism is arranged above the conveying belt, a forming mechanism which rotates synchronously with the conveying belt is connected to the conveying belt, a forming groove which cooperates with the spraying mechanism is arranged on the forming mechanism, the forming grooves are annularly connected in a head-tail mode along the conveying direction of the conveying belt, and a winding mechanism is arranged below the conveying belt. The graphene primary fiber is prone to deformation or even breakage during winding, which influences the forming quality.

Description

Technical Field

[0001] This invention relates to the field of graphene spinning technology, specifically to graphene spinning equipment and spinning methods. Background Technology

[0002] Graphene fibers, composed of nanoscale graphene sheets, have broad application prospects in conductivity, supercapacitors, super batteries, and energy storage. However, the superhydrophobic nature of graphene limits its insolubility in most organic and inorganic reagents, hindering direct preparation methods. Currently, the most common method for preparing graphene fibers is wet spinning. This process involves first obtaining graphene oxide and forming a suspension, then adding a thickening polymer such as polyvinyl alcohol to the suspension, followed by spinning to obtain nascent fibers, and finally reducing them to obtain graphene fibers.

[0003] Chinese patent CN 109750391A discloses a system and method for preparing graphene fibers using positive pressure spinning. The method involves using a casting device on a conveyor belt to extrude a graphene oxide suspension into a forming groove within the casting device. The casting device is then driven to move relative to the extrusion mechanism, causing the extruded graphene oxide suspension to be cast and formed within the forming groove to obtain nascent fibers. Finally, a winding device collects and winds the nascent fibers for subsequent reduction processing. While this patent can obtain nascent fibers, in actual forming, because the nascent fibers are cast and formed within the forming groove, they need to be separated from the groove during winding and collection. However, since the nascent fibers are newly cast, external force can easily cause deformation or even breakage when used to detach them from the groove, affecting the quality of the nascent fibers. Summary of the Invention

[0004] The present invention aims to provide graphene spinning equipment and spinning method to solve the problem in the prior art that graphene nascent fibers are easily deformed or even broken during winding, which affects the molding quality.

[0005] To solve the above problems, the present invention adopts the following technical solution: a graphene spinning device, including a conveyor belt, a jetting mechanism above the conveyor belt, a forming mechanism connected to the conveyor belt and rotating synchronously with the conveyor belt, a forming groove cooperating with the jetting mechanism on the forming mechanism, the forming groove being connected end to end in a ring along the conveying direction of the conveyor belt, and a winding mechanism below the conveyor belt.

[0006] The inventors discovered that when using existing molding methods for graphene spinning, the nascent fibers are easily stretched, deformed, or even broken during the winding process, affecting their quality. Through analysis, the inventors believe one reason for the poor winding quality is that the nascent fibers are formed within a molding groove, requiring external force to detach them during winding. This external force easily causes deformation and damage. More importantly, the existing winding device is located in the straight line of the nascent fiber transport. As the winding amount increases, the winding speed may increase, while the forming speed of the nascent fibers is fixed. Therefore, the winding device may exert tensile force along the length of the nascent fibers during winding, exacerbating deformation and even breakage.

[0007] The principle and beneficial effects of this solution are as follows: In this application, the forming mechanism rotates synchronously along the conveyor belt. When the forming mechanism rotates past the spraying mechanism, the spraying mechanism sprays the graphene oxide suspension into the forming groove of the forming mechanism. Since the spraying mechanism is located above the conveyor belt, after the graphene oxide suspension is sprayed into the forming groove, it flows into nascent filaments. The nascent filaments are dehydrated and dried to form nascent fibers. The nascent fibers follow the conveyor belt as the forming mechanism rotates to one end of the conveyor belt. As the conveyor belt continues to rotate, the forming mechanism and the nascent fibers in the forming groove are located on the bottom surface of the conveyor belt. The winding mechanism winds the nascent fibers. Since the winding mechanism is located below the conveyor belt, during the winding process, when the nascent fibers are wound from the forming groove to the winding mechanism, due to the angle between the nascent fibers and the forming groove, the nascent fibers will be subjected to a separation action perpendicular to the direction of the forming groove, making it easier for the nascent fibers to detach from the forming groove.

[0008] Meanwhile, since the winding mechanism is located below the conveyor belt, when the nascent fiber is detached from the forming groove and wound onto the winding mechanism, as the nascent fiber is continuously wound onto the winding mechanism and the overall volume of the winding mechanism continuously increases, the speed at which the nascent fiber is wound up continuously increases. At this time, the position where the nascent fiber detaches from the forming groove will automatically move towards the end of the conveyor belt to ensure that the nascent fiber will not be damaged due to the increasing tension during the winding process.

[0009] Preferably, as an improvement, the conveyor belt is inclined, and the graphene oxide suspension sprayed by the spraying mechanism moves towards the upper end of the conveyor belt to form the graphene oxide suspension, with the winding mechanism located below the upper end of the conveyor belt.

[0010] In this design, the conveyor belt is tilted, and the winding mechanism is positioned below the upper end of the conveyor belt. This not only reduces the space occupied by the graphene spinning equipment in the lateral direction, saving space, but also, due to the tilted conveyor belt, the forming trough on the conveyor belt is also tilted. The graphene oxide suspension sprayed by the spraying mechanism forms nascent fibers as it moves from the forming trough towards the upper end of the conveyor belt. Therefore, when the graphene oxide suspension is sprayed into the forming trough, it tends to flow along the forming trough towards the lower end of the conveyor belt. As the conveyor belt continues to move, the suspension remains within the forming trough and does not easily flow out, effectively improving the uniformity and integrity of the nascent fiber formation and enhancing its quality. Furthermore, since the winding mechanism is located below the upper end of the conveyor belt, it is easier to remove the wound nascent fibers after they have been wound, making the operation more convenient.

[0011] Preferably, as an improvement, the tilt angle of the conveyor belt is 25-45°.

[0012] In this design, the conveyor belt is set within this angle range, which facilitates the installation of the conveyor belt and the winding mechanism, and also benefits the formation of nascent fibers.

[0013] Preferably, as an improvement, the forming mechanism includes an outer deformation belt and an inner deformation belt. The elastic modulus of the outer deformation belt is less than that of the inner deformation belt. The inner deformation belt is located between the outer deformation belt and the conveyor belt. The forming groove is disposed on the outer side of the outer deformation belt, and an installation groove is opened on the inner side of the outer deformation belt. The inner deformation belt is connected to the installation groove.

[0014] In this design, because the elastic modulus of the outer deformation belt is smaller than that of the inner deformation belt, when the forming mechanism follows the conveyor belt to the high-end arc of the conveyor belt, the components closer to the outer side of the conveyor belt are more prone to deformation. In this design, the elastic modulus of the outer deformation belt is smaller than that of the inner deformation belt, making it easier for the outer deformation belt to deform when passing the high-end arc position of the conveyor belt. Furthermore, in this design, the inner deformation belt is located inside the outer deformation belt, and when passing the high-end arc position of the conveyor belt, the deformation of the inner deformation belt is smaller, thus exerting a squeezing effect on the outer deformation belt. This causes the nascent fibers in the forming groove on the outer deformation belt to be squeezed and detached from the forming groove, facilitating the rapid and easy detachment of the subsequent nascent fibers from the forming groove and their winding onto the winding mechanism.

[0015] Preferably, as an improvement, the cross-sectional shape of the forming groove is fan-shaped, triangular, V-shaped, or U-shaped.

[0016] In this scheme, the cross-section of the forming groove is set to various shapes in order to form nascent fibers of different shapes.

[0017] Preferably, as an improvement, the number of forming mechanisms is several, and the several forming mechanisms are arranged along the width direction of the conveyor belt. The number of spraying mechanisms is equal to the number of forming mechanisms and corresponds one-to-one.

[0018] In this solution, there are multiple spraying mechanisms and forming mechanisms, which correspond one-to-one, and multiple nascent fibers can be formed at one time, thus improving the forming efficiency.

[0019] Preferably, as an improvement, all spraying mechanisms are divided into several rows along the conveyor belt's conveying direction, with the spraying mechanisms in adjacent rows staggered.

[0020] Because the cross-sectional area of ​​nascent fibers is small, while the volume of the jetting mechanism is much larger than that of the nascent fibers, it is impossible to effectively arrange multiple jetting mechanisms when multiple forming mechanisms are arranged along the width of the conveyor belt. In this solution, all jetting mechanisms are divided into multiple rows, and the jetting mechanisms between adjacent rows are staggered to efficiently form nascent fibers.

[0021] Preferably, as an improvement, a heating mechanism is provided above the conveyor belt.

[0022] In this scheme, a heating mechanism is used to heat the graphene oxide suspension in the forming tank, so that the graphene oxide suspension is quickly dehydrated and dried to form nascent fibers.

[0023] Preferably, as an improvement, the winding mechanism includes a winding roller, and the heating mechanism includes a heating fan, wherein the direction of the hot air blown by the heating fan is parallel to the conveying direction of the conveyor belt.

[0024] In this scheme, the nascent fibers formed by all the forming mechanisms are wound by winding rollers, which is simple in structure and easy to operate. At the same time, hot air parallel to the conveyor belt conveying direction is used to heat the graphene suspension in the forming tank. This not only heats the graphene oxide suspension to dehydrate and dry it, but also the hot air does not generate lateral wind force on the suspension in the drying process, so that the graphene oxide suspension can be dehydrated and dried more stably and evenly in the forming tank.

[0025] A graphene spinning method, using the aforementioned graphene spinning equipment to prepare nascent graphene fibers, comprises the following steps:

[0026] Step 1: Prepare a graphene oxide suspension;

[0027] Step 2: Prepare graphene nascent fibers. The graphene oxide suspension from Step 1 is injected into the spraying mechanism. The spraying mechanism gradually presses the graphene oxide suspension into the forming tank of the forming mechanism. The speed at which the spraying mechanism squeezes the graphene oxide suspension is equal to the speed at which the conveyor belt moves the forming tank. The graphene oxide suspension is dehydrated and dried in the forming tank to form graphene nascent fibers.

[0028] Step 3: Winding the nascent graphene fibers. The nascent graphene fibers formed in the forming groove follow the forming mechanism to the bottom of the conveyor belt. Then, the nascent graphene fibers are detached from the forming groove and wound onto the winding mechanism. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of Embodiment 1 of the present invention.

[0030] Figure 2 This is a cross-sectional view of the conveyor belt and forming mechanism in Embodiment 1 of the present invention.

[0031] Figure 3 This is a schematic diagram of multiple spraying mechanisms arranged along the length of the conveyor belt in Embodiment 1 of the present invention.

[0032] Figure 4 This is a cross-sectional view of the injection mechanism in Embodiment 1 of the present invention.

[0033] Figure 5 This is a schematic diagram of Embodiment 2 of the present invention. Detailed Implementation

[0034] The following detailed description illustrates the specific implementation method:

[0035] The reference numerals in the accompanying drawings include: conveyor belt 1, rotating roller 2, spray cylinder 3, piston 4, nozzle 5, pressurizing motor 6, pressurizing screw 7, push block 8, top rod 9, outer deformation belt 10, forming groove 1101, inner deformation belt 11, bonding plate 12, winding roller 13, heating fan 14.

[0036] Example 1

[0037] This embodiment is as shown in the attached figure. Figure 1 As shown: Graphene spinning equipment includes a conveyor belt 1, which is circular in the vertical direction in the shape of a football field. Both ends of the conveyor belt 1 are rotatably connected to rotating rollers 2. The rotating rollers 2 drive the conveyor belt 1 to rotate cyclically. In this embodiment, the driving rollers 2 to rotate and drive the conveyor belt 1 to rotate cyclically are not shown. The rotating rollers 2 can be driven to rotate using existing power components such as motors, which will not be described in detail here.

[0038] Combination Figure 1 and Figure 2A spraying mechanism is provided above the conveyor belt 1. A forming mechanism that rotates synchronously with the conveyor belt 1 is connected to the conveyor belt 1. The forming mechanism is provided with a forming groove 1101 that cooperates with the spraying mechanism. The spraying mechanism is used to squeeze the graphene oxide suspension into the forming groove 1101. The graphene oxide suspension is dehydrated and dried in the forming groove 1101 to form nascent graphene fibers. In this embodiment, combined with Figure 4 The spraying mechanism includes a spraying cylinder 3, a piston 4, a nozzle 5, and a power component. The piston 4 is slidably connected inside the spraying cylinder 3, and the nozzle 5 is fixedly connected to the end of the spraying cylinder 3. The nozzle 5 has an orifice diameter of 0.5 mm. The power component is used to drive the piston 4 to slide relative to the spraying cylinder 3, so that the graphene oxide suspension in the spraying cylinder 3 is squeezed from the nozzle 5 into the forming groove 1101. The power component can be a cylinder or a motor screw. In this embodiment, a pressure motor 6 and a pressure screw 7 are used to drive the piston 4 to slide. Specifically, the pressure screw 7 is fixedly connected to the pressure motor 6. A push block 8 is slidably connected inside the spraying cylinder 3. The push block 8 is threadedly engaged with the screw, and a top rod 9 is fixedly connected between the push rod and the piston 4. When the pressure motor 6 rotates and drives the pressure screw 7 to rotate, the pressure screw 7 drives the push block 8 to slide inside the spraying cylinder 3, and finally causes the piston 4 to move relative to the spraying cylinder 3 under the action of the top rod 9, pushing the graphene oxide suspension in the spraying cylinder 3 out of the nozzle 5 at a uniform speed.

[0039] Combination Figure 2 and Figure 3 The molding mechanism includes an outer deformation belt 10 and an inner deformation belt 11. The elastic modulus of the outer deformation belt 10 is smaller than that of the inner deformation belt 11, and the outer deformation belt 10 is more flexible and deforms more easily under stress. For example, in this embodiment, the outer deformation belt 10 can be made of rubber with an elastic modulus of less than 10 MPa, while the inner deformation belt 11 is made of copper alloy with an elastic modulus of about 1000 MPa. The inner deformation belt 11 is located between the outer deformation belt 10 and the conveyor belt 1. The side of the outer deformation belt 10 facing the conveyor belt 1 is the inner side, and the other side is the outer side. The inner side of the outer deformation belt 10 has an installation groove, and the inner deformation belt 11 is snapped into the installation groove. The molding groove 1101 is integrally formed on the outer side of the outer deformation belt 10. The cross-section of the molding groove 1101 is fan-shaped, triangular, V-shaped, or U-shaped. In this embodiment, the cross-sectional shape of the molding groove 1101 is a semi-circular shape within a fan shape.

[0040] like Figure 2As shown, in this embodiment, there are multiple molding mechanisms, which are arranged at equal distances along the width of the conveyor belt 1. There is a gap between the outer deformation belts 10 of adjacent molding mechanisms so that the outer deformation belts 10 can undergo elastic deformation when subjected to external force. At the same time, in order to ensure that the adjacent molding mechanisms are accurately positioned as they rotate with the conveyor belt 1, in this embodiment, a bonding plate 12 is integrally formed on the side of the inner deformation belt 11 facing the conveyor belt 1. The bonding plate 12 is in contact with the conveyor belt 1 and the bonding plates 12 between adjacent molding mechanisms are in contact with each other.

[0041] Combination Figure 1 and Figure 3 Since the diameter of the spray cylinder 3 is large and the width of the forming groove 1101 is small, when multiple forming mechanisms are set, if multiple spray cylinders 3 need to be matched one-to-one with the forming groove 1101, there will not be enough space to install all the spray cylinders 3. Therefore, in this embodiment, all the spray cylinders 3 are divided into multiple rows. For example, if there are nine forming mechanisms, the spray cylinders 3 can be divided into three groups, and then the three groups are staggered along the length of the conveyor belt 1.

[0042] like Figure 1 As shown, a winding mechanism is provided below the conveyor belt 1, and a heating mechanism is provided above the conveyor belt 1. The winding mechanism is a rotating winding roller 13, and the heating mechanism includes a heating fan 14. The hot air blown by the heating fan 14 is parallel to the conveying direction of the conveyor belt 1. The hot air blown by the heating fan 14 can make the graphene oxide suspension in the forming tank 1101 dehydrate and dry more quickly to form graphene nascent fibers.

[0043] The graphene spinning method uses the aforementioned graphene spinning equipment to prepare primary graphene fibers. The preparation steps are as follows:

[0044] Step 1: Prepare graphene oxide suspension. First, prepare a graphene oxide solution with a concentration of 20 mg / ml using water and ethanol as solvents. Stir thoroughly at 50-60℃ to obtain a graphene oxide suspension.

[0045] Step 2: Preparation of nascent graphene fibers. The graphene oxide suspension from Step 1 is injected into the spray cylinder 3. Then, the pressure motor 6 drives the pressure screw 7 to rotate. The rotation of the pressure screw 7 drives the push block 8 to slide relative to the spray cylinder 3. When the push block 8 slides, it pushes the piston 4 relative to the spray cylinder 3 through the top rod 9, thereby squeezing the graphene oxide suspension in the spray cylinder 3 to the nozzle 5. The graphene oxide suspension is sprayed into the forming tank 1101 through the nozzle 5. The spraying speed of the graphene oxide suspension is equal to the forward movement speed of the forming tank 1101. At the same time, the heating fan 14 blows out hot air. The temperature of the hot air is controlled between 80-100℃ and the wind speed is controlled at 5M / Min. The graphene oxide suspension is dehydrated and dried in the forming tank 1101, thereby casting and forming nascent graphene fibers.

[0046] Step 3: Winding the nascent graphene fibers. The nascent graphene fibers formed in the forming groove 1101 rotate with the forming groove 1101. When the nascent graphene fibers rotate to the semicircle at the end of the conveyor belt 1, because the elastic modulus of the outer deformation band 10 is less than that of the inner deformation band 11, and combined with the fact that the circumferential position of the conveyor belt 1 is located on the outer side, a larger deformation will occur. This causes the outer deformation band 10 to deform more than the inner deformation band 11. During the deformation process, not only does the outer deformation band 10 automatically undergo elastic deformation, causing the nascent graphene fibers in the forming groove 1101 to automatically detach from the forming groove 1101, but the deformation of the inner deformation band 11 is less than that of the outer deformation band 10, so that the inner deformation band 11 has a greater impact on the outer deformation band 10. The variable belt 10 generates compression, further assisting the graphene nascent fibers in the forming groove 1101 to detach from the forming groove 1101. After the graphene nascent fibers are conveyed by the conveyor belt 1 past the end of the conveyor belt 1, they rotate to the bottom of the conveyor belt 1. The winding roller 13 winds the nascent fibers. It is worth noting that although the main part of the graphene nascent fibers has detached from the forming groove 1101, the outer variable belt 10 elastically resets after rotating to the bottom of the conveyor belt 1, so that the graphene nascent fibers are stuck in the forming groove 1101. At this time, only a small pulling force is needed to pull the graphene nascent fibers out of the forming groove 1101, and then the graphene nascent fibers are wound onto the winding roller 13 for subsequent concentrated twisting and reduction.

[0047] Example 2

[0048] The difference between Example 2 and Example 1 is as follows: Figure 5As shown, in this embodiment, the conveyor belt 1 is tilted at an angle of 25-45°, preferably 30°. By tilting the conveyor belt 1, when the graphene oxide suspension is pressed into the forming tank 1101, the graphene oxide suspension tends to flow along the forming tank 1101 towards the lower end of the conveyor belt 1. However, the graphene oxide suspension actually moves with the forming tank 1101 towards the upper end of the conveyor belt 1 for dehydration and drying, which reduces the possibility of the graphene oxide suspension overflowing from the forming tank 1101 and effectively improves the forming quality of the nascent graphene fibers.

[0049] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A graphene spinning device, including a conveyor belt, characterized in that: A spraying mechanism is provided above the conveyor belt, and a forming mechanism that rotates synchronously with the conveyor belt is connected to the conveyor belt. The forming mechanism is provided with a forming groove that cooperates with the spraying mechanism. The forming groove is connected end to end in a ring along the conveying direction of the conveyor belt. A winding mechanism is provided below the conveyor belt. The conveyor belt is set at an angle. The graphene oxide suspension sprayed by the spraying mechanism moves towards the upper end of the conveyor belt with the forming groove to form the graphene oxide. The winding mechanism is located below the upper end of the conveyor belt.

2. The graphene spinning equipment according to claim 1, characterized in that: The conveyor belt has an inclination angle of 25-45°.

3. The graphene spinning equipment according to claim 1, characterized in that: The forming mechanism includes an outer deformation belt and an inner deformation belt. The elastic modulus of the outer deformation belt is smaller than that of the inner deformation belt. The inner deformation belt is located between the outer deformation belt and the conveyor belt. The forming groove is set on the outer side of the outer deformation belt, and an installation groove is opened on the inner side of the outer deformation belt. The inner deformation belt is connected to the installation groove.

4. The graphene spinning equipment according to claim 3, characterized in that: The cross-sectional shape of the forming groove is fan-shaped, triangular, V-shaped, or U-shaped.

5. The graphene spinning equipment according to claim 4, characterized in that: The number of forming mechanisms is several, and the several forming mechanisms are arranged along the width direction of the conveyor belt. The number of spraying mechanisms is equal to the number of forming mechanisms and corresponds one-to-one.

6. The graphene spinning equipment according to claim 5, characterized in that: All spraying mechanisms are divided into several rows along the conveyor belt's conveying direction, with the spraying mechanisms in adjacent rows staggered.

7. The graphene spinning equipment according to claim 1, characterized in that: A heating mechanism is provided above the conveyor belt.

8. The graphene spinning equipment according to claim 7, characterized in that: The winding mechanism includes a winding roller, and the heating mechanism includes a heating fan, wherein the direction of the hot air blown by the heating fan is parallel to the conveying direction of the conveyor belt.

9. A graphene spinning method, characterized in that: The graphene nascent fibers are prepared using the graphene spinning equipment as described in any one of claims 1-8, and the preparation steps are as follows: Step 1: Prepare a graphene oxide suspension; Step 2: Prepare graphene nascent fibers. The graphene oxide suspension from Step 1 is injected into the spraying mechanism. The spraying mechanism gradually presses the graphene oxide suspension into the forming tank of the forming mechanism. The speed at which the spraying mechanism squeezes the graphene oxide suspension is equal to the speed at which the conveyor belt moves the forming tank. The graphene oxide suspension is dehydrated and dried in the forming tank to form graphene nascent fibers. Step 3: Winding the nascent graphene fibers. The nascent graphene fibers formed in the forming groove follow the forming mechanism to the bottom of the conveyor belt. Then, the nascent graphene fibers are detached from the forming groove and wound onto the winding mechanism.

Images