Porous electrostatic spinning electrode

Abstract

The porous electrostatic spinning electrode comprises a base, a material storage tank, a receiving electrode and a shell electrode, the shell electrode comprises a main body and a cover plate, one side of the main body is an arc-shaped surface, the other side of the main body is a plane, and a plurality of spinning holes are uniformly formed in the arc-shaped surface of the main body; when the electrode is applied to electrostatic spinning, the problems of mounting and dismounting of a large number of needles are avoided, the whole device is easy to mount and dismount, the electrode is relatively simple in structure and suitable for various polymer spinning solutions, and continuous and large-scale production of nanofiber yarn can be achieved.

Description

Technical Field

[0001] The present invention relates to the field of nanofiber preparation, and more particularly to a porous electrospinning electrode. Background Art

[0002] In the field of nanofiber preparation, the electrospinning method has been recognized as one of the simple and effective important means for preparing micro-nanofibers. Especially in recent years, with the expansion of nanofibers in the fields of membrane purification, new energy, and biotechnology, the electrospinning technology has attracted much attention due to the convenience of preparing micro-nanofibers. However, since the electrospinning technology was invented by Formalas in 1934, the industrialization of electrospinning to prepare nanofibers has not reached the expected level, mainly due to two reasons: (1) the complex environmental influencing factors of the electrospinning process make it impossible to produce stably in batches; (2) the limiting factors of the electrospinning-related equipment itself: such as the well-known problems that the electric fields between the needles repel each other, resulting in uneven distribution of the needle electric field, clogging of the spinning needles, dripping of the needles, and the large workload and high maintenance cost of installing and disassembling a large number of needles.

[0003] To improve the efficiency of electrospinning, first, a multi-nozzle electrospinning device was invented, and Theron experimented with the single-needle, seven-needle, and nine-needle square arrangements. In the multi-needle method, when the size distribution of the infusion volume of each needle is uneven and the infusion volume of some needles is greater than the amount required for spinning, the spinning material liquid at the end of the nozzle will form liquid drops. To ensure that the spinning material liquid is delivered to each nozzle at a constant pressure or flow rate, an electronically controlled multi-pump multi-nozzle electrospinning machine was developed. This device uses multiple micro-syringes to precisely control the infusion volume of each nozzle. However, this method has poor industrial operability, high cost, and cannot avoid the electrostatic repulsion interference and needle clogging problems between the nozzles. Later, roller-type needleless or other rotary electrospinning methods emerged. However, during the rotation process, the open trough leads to rapid volatilization of the solvent, which has an adverse effect on the stability of the spinning state and the quality of the nanofibers due to the change in the viscosity of the material liquid during the spinning process. Summary of the Invention

[0004] The object of the present invention is to solve the above problems, and provide a porous electrospinning electrode. The whole device is simple to install and disassemble. The problem of clogging of the spinning holes during the spinning process is solved by the vibration of ultrasonic waves. The completely enclosed structure avoids the problem of solvent volatilization during the spinning process, and ensures the stability of the viscosity of the material liquid during the spinning process.

[0005] The technical solution adopted by the present invention to solve its technical problems is: A porous electrospinning electrode includes a base, a storage tank, a receiving electrode, and a shell electrode. The shell electrode includes a main body and a cover plate. One side of the main body is an arc surface, and the other side is a flat surface. A number of spinning holes are evenly arranged on the arc surface of the main body. The cover plate is provided with a feed inlet connected to the storage tank, and the main body is provided with a high-voltage column and an ultrasonic connection hole.

[0006] Further, the flat surface of the main body is connected to the cover plate by screws.

[0007] Further, a rubber layer is provided between the main body and the cover plate.

[0008] Further, the feed inlet is connected to the storage tank through a pipeline, and a metering pump is provided on the pipeline.

[0009] Further, the main body is provided with mounting holes, and the base is provided with a first bracket. The upper end of the first bracket is connected to the mounting holes on the main body.

[0010] Further, the base is provided with a second bracket, and an ultrasonic generator is provided on the second bracket. The ultrasonic generator is connected to the ultrasonic connection hole through an ultrasonic connecting rod.

[0011] Further, the positive electrode of the high-voltage power supply is connected to the shell electrode through the high-voltage column, and the negative electrode of the high-voltage power supply is connected to the receiving electrode through a power line.

[0012] Further, the base is provided with a third bracket for supporting the receiving electrode.

[0013] Further, a cavity is provided inside the main body, and the cavity is stepped and gradually becomes narrower from top to bottom.

[0014] The beneficial effects of the present invention are as follows: 1. In the present invention, the shell electrode includes a main body and a cover plate. One side of the main body is an arc surface, and the other side is a flat surface. A number of spinning holes are evenly arranged on the arc surface of the main body. The application in electrospinning avoids the problems of installation and disassembly of a large number of needles. The installation and disassembly of the whole device are simple. The structure of this electrode is relatively simple, suitable for a variety of polymer spinning solutions, and can realize the continuous and large-scale production of nanofiber yarns.

[0015] 2. In the present invention, the cover plate is provided with a feed inlet connected to the storage tank, and a rubber layer is provided between the main body and the cover plate. Align the shell electrode cavity, the rubber layer, and the shell electrode cover from bottom to top in sequence, and fix the three into one body through screws to form a sealed cavity. The completely enclosed structure avoids the problem of solvent volatilization during the spinning process and ensures the viscosity stability of the material liquid during the spinning process.

[0016] 3. The present invention is provided with a high-voltage wire column and an ultrasonic connection hole on the main body, and solves the problem of blockage of the spinning holes during the spinning process through the vibration of ultrasonic waves. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 It is a schematic diagram of the shell electrode of the present invention; Figure 3 It is a schematic diagram of the internal structure of the main body of the present invention.

[0019] In the figure: base 1, storage tank 2, receiving electrode 3, shell electrode 4, main body 5, cover plate 6, spinning hole 7, feed inlet 8, high-voltage wire column 9, ultrasonic connection hole 10, rubber layer 11, pipeline 12, metering pump 13, mounting hole 14, first bracket 15, second bracket 16, ultrasonic generator 17, high-voltage power supply 18, third bracket 19, ultrasonic connecting rod 20. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Such as Figure 1 And Figure 2As shown in the figure, a porous electrospinning electrode includes a base 1, a storage tank 2, a receiving electrode 3, and a shell electrode 4. The shell electrode 4 includes a main body 5 and a cover plate 6. One side of the main body 5 is an arc surface, and the other side is a flat surface. A number of spinning holes 7 are evenly arranged on the arc surface of the main body 5. Its application in electrospinning avoids the problems of installation and disassembly of a large number of needles. The installation and disassembly of the entire device are simple. The structure of this electrode is relatively simple, suitable for a variety of polymer spinning solutions, and can realize the continuous and large-scale production of nanofiber yarns. The cover plate 6 is provided with a feed port 8 connected to the storage tank 2. The completely enclosed structure avoids the problem of solvent volatilization during the spinning process and ensures the stable viscosity of the liquid material during the spinning process. The main body 5 is provided with a high-voltage wire column 9 and an ultrasonic connection hole 10. The problem of spinning hole blockage during the spinning process is solved by the vibration of ultrasonic waves.

[0022] As Figure 2 shown, the flat surface of the main body 5 is connected to the cover plate 6 by screws.

[0023] As Figure 2 shown, a rubber layer 11 is provided between the main body 5 and the cover plate 6. Align the shell electrode cavity, the rubber layer, and the shell electrode cover from bottom to top, and fix the three together with screws to form a sealed cavity.

[0024] As Figure 1 shown, the feed port 8 is connected to the storage tank 2 through a pipeline 12, and a metering pump 13 is provided on the pipeline 12.

[0025] As Figure 1 and Figure 2 shown, the main body 5 is provided with a mounting hole 14, and the base 1 is provided with a first bracket 15. The upper end of the first bracket 15 is connected to the mounting hole 14 on the main body 5 by screws.

[0026] As Figure 1 and Figure 2 shown, the base 1 is provided with a second bracket 16, and an ultrasonic generator 17 is provided on the second bracket 16. The ultrasonic generator 17 is connected to the ultrasonic connection hole 10 through an ultrasonic connecting rod 20. An insulating pad is provided at the connection position of the ultrasonic connecting rod 20 of the ultrasonic generator 17 and the ultrasonic connection hole 10.

[0027] As Figure 1 shown, it further includes that the positive electrode of the high-voltage power supply 18 is connected to the shell electrode 4 through the high-voltage wire column 9, and the negative electrode of the high-voltage power supply 18 is connected to the receiving electrode 3 through a power line.

[0028] As Figure 1 shown, the base 1 is provided with a third bracket 19 for supporting the receiving electrode 3.

[0029] As shown Figure 3 inside the main body 5 there is a cavity, which is stepped and gradually narrows from top to bottom, facilitating cleaning.

[0030] The length-width ratio of the shell electrode is 3:1; the length range: adjustable from 75 to 200 mm; the main body thickness range of the shell electrode is: adjustable from 10 to 30 mm; the end aperture range of the spinning holes: 0.1 - 1.0 mm; preferably: 0.2 - 0.5 mm; the outer edge of the shell electrode is ax-shaped, gradually thinning from the main body thickness, and the outermost end is arc-shaped, with the radius of the arc: 0.5 - 2 mm. The hole pitch of the spinning holes: 5 - 20 mm, preferably: 5 - 10 mm.

[0031] First, the first bracket 15 fixes the shell electrode on the base 1 through the mounting holes; the ultrasonic generator 17 is fixed on the base 1 through the second bracket 16; the ultrasonic generator 17 is connected to the ultrasonic connection hole 10 of the shell electrode 4 through the ultrasonic connecting rod 20, and the ultrasonic generator 17 is insulated from the shell electrode 4 through the insulating pad; the receiving electrode 3 is fixed on the base 1 through the third bracket 19; the positive pole of the high-voltage power supply 18 is connected to the shell electrode 4 through the high-voltage wire column 9; the negative pole of the high-voltage power supply 18 is connected to the receiving electrode 3 through the power cord; the storage tank 2 is connected to the feed port 8 of the shell electrode 4 through the pipeline 12, and a metering pump 13 is installed in series between the shell electrode 4 and the storage tank 2. The ultrasonic generator 17 is fixed on the base 1 through the second bracket 16.

[0032] Start the metering pump to transport the liquid material from the storage tank to the cavity of the shell electrode. First, the slurry fills the cavity, and then flows out through the spinning holes. At this time, turn on the high-voltage power supply to form a high-voltage electrostatic field between the shell electrode and the receiving electrode. The critical voltage of the liquid material at the spinning holes is 50 kV under the action of the high-voltage electrostatic field, overcoming the constraints of gravity and surface tension, splitting into micro-nano jets, and being received by the receiving electrode to accumulate into a nanofiber membrane material.

[0033] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "left", "right", "up", "down", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" 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, an electrical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. 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.

Claims

1. A porous electrospun electrode, comprising a base (1), a storage tank (2), a receiving electrode (3) and a shell electrode (4), characterized in that, The shell electrode (4) includes a main body (5) and a cover plate (6). One side of the main body (5) is an arc surface, and the other side is a flat surface. A number of spinning holes (7) are evenly arranged on the arc surface of the main body (5). The cover plate (6) is provided with a feed inlet (8) connected to the storage tank (2), and the main body (5) is provided with a high-voltage column (9) and an ultrasonic connection hole (10).

2. The porous electrospun electrode according to claim 1, characterized in that, The flat surface of the main body (5) is connected to the cover plate (6) by screws.

3. The porous electrospun electrode according to claim 2, wherein A rubber layer (11) is provided between the main body (5) and the cover plate (6).

4. A porous electrospun electrode according to claim 1, characterized in that, The feed inlet (8) is connected to the storage tank (2) through a pipeline (12), and a metering pump (13) is provided on the pipeline (12).

5. The porous electrospun electrode according to claim 1, wherein The main body (5) is provided with a mounting hole (14), and the base (1) is provided with a first bracket (15). The upper end of the first bracket (15) is connected to the mounting hole (14) on the main body (5).

6. The porous electrospun electrode according to claim 1, wherein The base (1) is provided with a second bracket (16), and an ultrasonic generator (17) is provided on the second bracket (16). The ultrasonic generator (17) is connected to the ultrasonic connection hole (10) through an ultrasonic connecting rod (20).

7. The porous electrospun electrode according to claim 1, wherein It also includes that the positive electrode of the high-voltage power supply (18) is connected to the shell electrode (4) through the high-voltage column (9), and the negative electrode of the high-voltage power supply (18) is connected to the receiving electrode (3) through a power line.

8. A porous electrospun electrode according to claim 7, characterized in that, The base (1) is provided with a third bracket (19) for supporting the receiving electrode (3).

9. The porous electrospun electrode according to claim 1, characterized in that, The main body (5) is internally provided with a cavity, and the cavity is stepped and gradually becomes narrower from top to bottom.

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