Free liquid level type electrostatic spinning device

Abstract

The invention relates to a free liquid level type electrostatic spinning device which comprises a high-voltage generator, two supporting frames, a liquid dropping platform, a plurality of sets of jet flow generating devices, a collecting plate and a liquid supply device. The two support frames are symmetrically fixed on the high-voltage generator; the liquid dropping platform is slidably installed between the two supporting frames, and a plurality of grooves are formed in the top face of the liquid dropping platform. The multiple sets of jet flow generating devices are arranged between the two supporting frames and correspond to the multiple grooves. The collecting plate is arranged right above the plurality of groups of jet flow generating devices; and the liquid supply device is connected with the liquid inlet pipeline. The spinning solution drips from the liquid outlet pipeline and then falls onto the metal wires to form a free liquid level, large-range nano-micron fibers are generated and deposited on the collecting plate under the action of an electric field between the metal wires and the collecting plate, the wire output amount is large, the production efficiency is high, the metal wires can be kept far away from one another, the interference effect of the electric field is avoided, and the production efficiency is improved. And the fiber forming and spinning stability is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of electrostatic spinning, and in particular relates to a free liquid surface type electrostatic spinning device. Background Art

[0002] Electrospinning is one of the common methods for preparing micro-nano fibers. It is simple to operate, and different properties and functions can be given to micro-electrospun nanofibers according to the selected spinning solution formula. Micro-nano fibers prepared by electrospinning technology have the advantages of high specific surface area, controllable morphology, fine structure and replaceable components, which makes them widely used in filtration adsorption, sensors, energy storage, medical, catalysis and other aspects. At present, most electrospinning is based on single needles, and its production efficiency is low, with an output of only 0.1 to 1 g / h, and the needle is easy to clog and needs to be cleaned regularly, which greatly limits its industrial application.

[0003] In response to the above problems, the current approach is mainly to change the single needle of the jet generating device to multiple needles, and to increase the number of needles to improve the spinning efficiency. Chinese patents CN201811114850.9, CN202011163131.3, CN202210758083.5 and CN201910566867.6 disclose electrospinning devices for batch preparation of nanofibers by setting up arrays of multiple needles. However, as the number of needles increases, the electric field interference at the needle tip of each needle will become more obvious, thereby affecting the fiber formation and spinning stability. At the same time, the multi-needle mode still has the problem of easy clogging of the needle, which requires regular shutdown and cleaning, greatly affecting production efficiency. Summary of the invention

[0004] The main purpose of the present invention is to propose a free liquid surface electrospinning device, which can effectively solve the problems in the background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A free liquid surface electrospinning device, comprising

[0007] High voltage generator;

[0008] Two support frames are symmetrically fixed on the high voltage generator;

[0009] A liquid dropping platform is slidably mounted between the two support frames, and the top surface of the liquid dropping platform has a plurality of grooves;

[0010] A plurality of groups of jet generating devices are arranged between the two support frames and correspond to the plurality of grooves. The jet emitters include two metal wires and an electric three-way valve. The two metal wires are inserted into the corresponding grooves, and the two ends are respectively fixedly connected to the two support frames and connected to the electrodes of the high-voltage generator. The electric three-way valve is fixed to the top of the corresponding groove. The electric three-way valve is connected to two liquid outlet pipes and one liquid inlet pipe. The outlets of the two liquid outlet pipes are respectively located directly above the two metal wires.

[0011] A collecting plate, arranged directly above the plurality of groups of jet generating devices;

[0012] A liquid supply device is connected to the liquid inlet pipeline and is used to provide spinning liquid.

[0013] Preferably, support rods are fixed to the bottoms of both ends of the dripping platform, and the bottoms of the support rods are slidably connected to the sides of the high-voltage generator via slide rails.

[0014] Preferably, the liquid supply device comprises

[0015] A spinning solution container, used for storing the spinning solution;

[0016] A plurality of suction pumps, the inlets of which are connected to the spinning solution container through pipelines, and the outlets of which are connected to the corresponding liquid inlet pipelines through pipelines.

[0017] Preferably, a plurality of scraping self-cleaning devices are provided on the front and rear sides of the dripping platform, and the plurality of scraping self-cleaning devices correspond to the plurality of metal wires and are used to scrape off residues on the metal wires, wherein the scraping self-cleaning device corresponding to the first metal wire in each group of jet generating devices is located on the rear side of the dripping platform, and the scraping self-cleaning device corresponding to the second metal wire in each group of jet generating devices is located on the front side of the dripping platform.

[0018] Preferably, the scraper liquid self-cleaning device comprises

[0019] A mounting seat is fixed on the side of the dripping platform, a mounting groove is provided on the side of the mounting seat, the metal wire passes through the mounting groove, and a collecting groove is provided on the bottom of the mounting groove directly below the metal wire;

[0020] A lifting control assembly is fixed on the top surface of the mounting groove;

[0021] The scraper is located directly above the metal wire and connected to the bottom of the lifting control component. The lifting and lowering can be controlled by the lifting control component. The bottom of the scraper is provided with an arc opening, which is adapted to the metal wire.

[0022] Preferably, the lifting control component is an electromagnet.

[0023] Preferably, it further comprises a recovery device, wherein the recovery device comprises

[0024] Residue collection container;

[0025] A plurality of recovery pipes are connected to the residue collection container at one end and to the bottom of the corresponding collection tank at the other end.

[0026] The present invention provides a free liquid surface electrospinning device, which has the following beneficial effects:

[0027] 1. After the spinning liquid drips from the liquid outlet pipe, it falls on the metal wire to form a free liquid surface. Under the action of the electric field between the metal wire and the collecting plate, a large number of jets are formed on the liquid surface and move toward the collecting plate, and then stretched and refined into nano-micron fibers, and finally deposited on the collecting plate. With the reciprocating motion of the dripping platform, the spinning liquid is evenly supplied and continuously drips on the metal wire, resulting in a large range of nano-micron fibers deposited on the collecting plate. The output is large and the production efficiency is high. In addition, a long distance can be ensured between the metal wires to avoid the interference of the electric field and ensure the stability of fiber forming and spinning.

[0028] 2. Under the reciprocating motion of the dripping platform, the scraper and the electric three-way valve work together to continuously generate nano-micron fibers and deposit them on the collecting plate. Before the spinning solution drips onto the metal wire, the scraper can scrape the residue into the collecting tank to ensure the cleanliness of the metal wire surface. This can ensure the quality of the micro-nano fibers and there is no need to stop the machine for manual cleaning, further improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of the free liquid surface electrospinning device of the present invention;

[0030] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle.

[0031] In the figure: 1. high pressure generation; 2. support frame; 3. dripping platform; 31. groove; 4. jet generating device; 41. metal wire; 42. electric three-way valve; 43. liquid outlet pipe; 44. liquid inlet pipe; 5. collecting plate; 6. liquid supply device; 61. spinning liquid container; 62. suction pump; 7. support rod; 8. slide rail; 9. liquid scraping self-cleaning device; 91. mounting seat; 911. mounting groove; 912. collecting groove; 92. lifting control assembly; 93. scraper; 10. residue collection container; 11. recovery pipe. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0033] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than 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.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of 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.

[0036] Example 1

[0037] Reference Figure 1-2 , a free liquid surface electrospinning device, comprising

[0038] High voltage generator 1, externally connected to a positive voltage of 45 kV;

[0039] Two support frames 2 are symmetrically fixed on the high voltage generator 1;

[0040] The dripping platform 3 is slidably mounted between the two support frames 2 and can reciprocate back and forth at a speed of 10 m / min. The top surface of the dripping platform 3 has a plurality of grooves 31;

[0041] A plurality of groups of jet generating devices 4 are arranged between the two support frames 2 and correspond to the plurality of grooves 31. The jet emitter includes two metal wires 41 and an electric three-way valve 42. The two metal wires 41 are inserted into the corresponding grooves 31, and the two ends are fixedly connected to the two support frames 2 respectively, and connected to the electrodes of the high-voltage generator 1. It should be noted that the electrodes of the high-voltage generator 1 are located in the support frame 2, and the electrodes are connected to the metal wires 41 in the support frame 2. In this embodiment, the number of jet generating devices 4 is 6 groups, and the metal wires 41 are connected to the electrodes of the high-voltage generator 1. There are 12 wires 41 in total, and the material of the metal wires 41 can be stainless steel, tungsten, copper, etc. The length of the metal wires 41 is 1.2m, and the cross-section is a circle with a diameter of 3mm; the electric three-way valve 42 is fixed on the top of the corresponding groove 31, and the electric three-way valve 42 is connected to two liquid outlet pipes 43 and a liquid inlet pipe 44, and the outlets of the two liquid outlet pipes 43 are respectively located directly above the two metal wires 41, and the diameters of the liquid inlet pipe 44 and the liquid outlet pipe 43 are 1cm and 0.5cm respectively, and the drip height of the liquid outlet pipe 43 is 0.8cm;

[0042] A collecting plate 5 is arranged directly above the plurality of jet generating devices 4, and the collecting plate 5 is grounded to form an electric field with the metal wire 41;

[0043] The liquid supply device 6 is connected to the liquid inlet pipeline 44 and is used to provide spinning liquid.

[0044] When the device is in use, the high voltage generator 1 is started to provide the metal wire 41 with the voltage required for spinning, an electric field is formed between the metal wire 41 and the collecting plate 5, and the liquid supply device 6 provides the spinning liquid to the liquid inlet pipe 44. The spinning liquid drips from the pipe mouth of the liquid outlet pipe 43 after passing through the electric three-way valve 42. The electric three-way valve 42 can control the two liquid outlet pipes 43 to drip liquid at the same time, and can also control any liquid outlet pipe 43 to drip liquid. It can be adjusted according to specific needs. After the spinning liquid drips from the liquid outlet pipe 43, it falls on the metal wire 41 to form a free liquid surface. Under the action of the electric field between the metal wire 41 and the collecting plate 5, a large number of jets are formed on the liquid surface and move toward the collecting plate 5, and then stretched and refined into nano-micron fibers, and finally deposited on the collecting plate 5. With the reciprocating motion of the dripping platform 3, the spinning liquid is evenly supplied and continuously drips on the metal wire 41, resulting in a large range of nano-micron fibers deposited on the collecting plate 5. The output of the wire is large and the production efficiency is high. In addition, a long distance can be ensured between the metal wires 41 to avoid the interference of the electric field and ensure the stability of fiber forming and spinning.

[0045] In a specific embodiment, a sliding installation structure of a dripping platform 3 is provided, and support rods 7 are fixed to the bottom of both ends of the dripping platform 3. The bottom of the support rod 7 is slidably connected to the side of the high-voltage generator 1 through a slide rail 8. Under the action of the slide rail 8, the dripping platform 3 can reciprocate back and forth. Preferably, the dripping platform 3 can be driven by a motor.

[0046] In a specific embodiment, the liquid supply device 6 comprises

[0047] A spinning solution container 61, used for storing the spinning solution;

[0048] A plurality of suction pumps 62 are provided, wherein the inlets are connected to the spinning liquid container 61 through pipelines (not shown), and the outlets are connected to the corresponding liquid inlet pipelines 44 through pipelines (not shown). The working power of the suction pump 62 is 350W. The spinning liquid in the spinning liquid container 61 can be transported to the electric three-way valve 42 through the suction pump 62.

[0049] In this embodiment, a mounting plate is fixedly connected between the two support rods 7, which can improve the stability of the two support rods 7, and the spinning solution container 61 and the suction pump 62 can also be conveniently installed on the mounting plate.

[0050] Example 2

[0051] After the device has been running for a period of time, the spinning solution dripping onto the metal wire 41 may produce viscous residues due to solvent volatilization and failure to produce wires in time, which may affect production, and thus the device needs to be stopped for manual cleaning, which will affect production efficiency. Therefore, in order to further improve production efficiency, further design can be made based on the structure of Example 1, and the specific design is as follows:

[0052] The front and rear sides of the liquid dripping platform 3 are provided with a plurality of liquid scraping self-cleaning devices 9, which correspond to the plurality of metal wires 41 and are used to scrape off the residue on the metal wires 41, wherein the liquid scraping self-cleaning device 9 corresponding to the first metal wire 41 in each group of jet generating devices 4 is located on the rear side of the liquid dripping platform 3, and the liquid scraping self-cleaning device 9 corresponding to the second metal wire 41 in each group of jet generating devices 4 is located on the front side of the liquid dripping platform 3. Figure 2 The first wire is on the left side of the center and the second wire is on the right side.

[0053] In a specific embodiment, the scraper liquid self-cleaning device 9 comprises

[0054] The mounting seat 91 is fixed on the side of the dripping platform 3. The side of the mounting seat 91 is provided with a mounting groove 911. The metal wire 41 passes through the mounting groove 911. The bottom surface of the mounting groove 911 is located directly below the metal wire 41 and is provided with a collecting groove 912. The collecting groove 912 is a quadrilateral container with a size of 2 cm×5 cm×2 cm.

[0055] A lifting control assembly 92 is fixed on the top surface of the mounting groove 911;

[0056] The scraper 93 is located directly above the metal wire 41 and is connected to the bottom of the lifting control component 92 . The lifting and lowering can be controlled by the lifting control component 92 . A circular arc opening is provided at the bottom of the scraper 93 , and the circular arc opening is adapted to the metal wire 41 .

[0057] On the basis of the above, the present invention also provides a method for using a free liquid surface electrospinning device, comprising the following steps:

[0058] S1: dissolving the polymer in an organic solvent, stirring evenly to obtain a spinning solution, and placing the spinning solution in a spinning solution container 61;

[0059] S2: The dripping platform 3 is close to the support frame 2 on the front side in the initial state. After the device is started, the dripping platform 3 starts to move backward. At the same time, the scraper 93 directly above the first metal wire 41 in the jet generating device 4 descends under the control of the lifting control component 92, and its arc opening fits with the metal wire 41. The suction pump 62 transports the spinning solution to the electric three-way valve 42. The electric three-way valve 42 controls the flow direction, so that the liquid outlet pipe 43 directly above the first metal wire 41 in the jet generating device 4 drips liquid, so that before the spinning solution drips onto the first metal wire 41, the scraper 93 has cleaned the surface of the metal wire 41;

[0060] S3: When the dripping platform 3 reaches the farthest end and starts to move in the reverse direction, the scraper 93 directly above the second metal wire 41 in the jet generating device 4 descends under the control of the lifting control component 92, and its arc opening fits with the metal wire 41, while the scraper 93 directly above the first metal wire 41 rises under the control of the lifting control component 92 and detaches from the surface of the metal wire 41, and the electric three-way valve 42 controls the flow direction, so that the liquid outlet pipe 43 directly above the second metal wire 41 in the jet generating device 4 drips liquid. Similarly, before the spinning liquid drips onto the second metal wire 41, the scraper 93 has cleaned the surface of the metal wire 41;

[0061] S4: After the dripping platform 3 has reciprocated for several cycles, preferably 3-5 cycles, the high-voltage generator 1 is started and the voltage is adjusted until an umbrella-shaped jet profile is formed on the surface of the metal wire 41 and no dripping occurs. Under the reciprocating motion of the dripping platform 3, the scraper 93 and the electric three-way valve 42 work together to continuously generate nano-micron fibers and deposit them on the collecting plate 5. Before the spinning solution drips onto the metal wire 41, the scraper 93 can scrape the residue into the collecting tank 912 to ensure the cleanliness of the surface of the metal wire 41. In this way, the quality of the micro-nano fibers can be guaranteed, and there is no need to stop the machine for manual cleaning, thereby further improving production efficiency.

[0062] In a specific embodiment, the lifting control component 92 is an electromagnet, which is controlled by a circuit switch to achieve the adsorption and separation of the scraper 93 and the electromagnet, that is, the lifting and lowering of the scraper 93.

[0063] In a specific embodiment, it also includes a recovery device, the recovery device includes

[0064] Residue collection container 10;

[0065] A plurality of recovery pipes 11 are connected to the residue collection container 10 at one end and to the bottom of the corresponding collection tank 912 at the other end. The recovery pipes can use a negative pressure suction system to suck the residue in the collection tank 912 into the residue collection container 10 for overall collection, so as to facilitate subsequent recovery processing.

[0066] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A free liquid surface electrospinning device, characterized in that: include High voltage generator; Two support frames are symmetrically fixed on the high voltage generator; A liquid dropping platform is slidably mounted between the two support frames, and the top surface of the liquid dropping platform has a plurality of grooves; A plurality of groups of jet generating devices are arranged between the two support frames and correspond to the plurality of grooves. The jet emitters include two metal wires and an electric three-way valve. The two metal wires are inserted into the corresponding grooves, and the two ends are respectively fixedly connected to the two support frames and connected to the electrodes of the high-voltage generator. The electric three-way valve is fixed to the top of the corresponding groove. The electric three-way valve is connected to two liquid outlet pipes and one liquid inlet pipe. The outlets of the two liquid outlet pipes are respectively located directly above the two metal wires. A collecting plate, arranged directly above the plurality of groups of jet generating devices; A liquid supply device is connected to the liquid inlet pipeline and is used to provide spinning liquid.

2. A free liquid surface electrospinning device according to claim 1, characterized in that: Support rods are fixed to the bottoms of both ends of the dripping platform, and the bottoms of the support rods are slidably connected to the side surfaces of the high-voltage generator through slide rails.

3. A free liquid surface electrospinning device according to claim 1, characterized in that: The liquid supply device comprises a spinning liquid container for storing the spinning liquid; A plurality of suction pumps, the inlets of which are connected to the spinning solution container through pipelines, and the outlets of which are connected to the corresponding liquid inlet pipelines through pipelines.

4. A free liquid surface electrospinning device according to claim 1, characterized in that: A plurality of scraping self-cleaning devices are arranged on the front and rear sides of the dripping platform, and the plurality of scraping self-cleaning devices correspond to the plurality of metal wires and are used to scrape off residues on the metal wires, wherein the scraping self-cleaning device corresponding to the first metal wire in each group of jet generating devices is located on the rear side of the dripping platform, and the scraping self-cleaning device corresponding to the second metal wire in each group of jet generating devices is located on the front side of the dripping platform.

5. A free liquid surface electrospinning device according to claim 4, characterized in that: The liquid scraping self-cleaning device comprises A mounting seat is fixed on the side of the dripping platform, a mounting groove is provided on the side of the mounting seat, the metal wire passes through the mounting groove, and a collecting groove is provided on the bottom of the mounting groove directly below the metal wire; A lifting control assembly is fixed on the top surface of the mounting groove; The scraper is located directly above the metal wire and connected to the bottom of the lifting control component. The lifting and lowering can be controlled by the lifting control component. The bottom of the scraper is provided with an arc opening, which is adapted to the metal wire.

6. A free liquid surface electrospinning device according to claim 5, characterized in that: The lifting control component is an electromagnet.

7. A free liquid surface electrospinning device according to claim 5, characterized in that: Also includes a recovery device, the recovery device includes Residue collection container; A plurality of recovery pipes are connected to the residue collection container at one end and to the bottom of the corresponding collection tank at the other end.

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