Electrostatic spinning device

Abstract

The utility model relates to an electrostatic spinning device which comprises a frame body. The line electrode is arranged on the frame body in a crossing manner; the coating device is arranged on the line electrode in a sliding manner and is connected with the liquid supply device; the liquid scraping pieces are arranged at the end parts of the two ends of the wire electrode in a reciprocating motion manner; and the liquid collecting tank is arranged at the bottom of the frame body and is positioned below the liquid scraping piece. According to the electrostatic spinning device, the liquid scraping pieces are arranged at the ends of the line electrodes, residual spinning liquid at the two ends of the line electrodes is cleaned, on the basis that the coating performance is not affected, gel caused by water absorption can be prevented from being splashed to produced products, and the product quality is improved.

Description

Technical Field

[0001] The utility model relates to an electrostatic spinning device. Background Art

[0002] With the development of modern science and technology, researchers have put forward higher and higher requirements for material performance. Among the materials that are rapidly developing and widely used, nanofibers have been widely used in filtration, biomedicine, sensors, catalysts and other fields because of their large specific surface area and high porosity, as well as the surface effect, quantum size effect, quantum tunneling effect and dielectric effect of nanomaterials, and have good development prospects. At present, there are many methods for preparing nanofibers, such as stretching, template synthesis, phase separation, electrospinning, etc. The first three methods are still at the laboratory level due to poor process controllability. Electrospinning technology has attracted more and more researchers' attention due to its low cost, simple process and wide range of spinnable polymers.

[0003] Traditional needle-type electrospinning mainly consists of a nozzle, a high-voltage generator and a receiving device. Under the condition of an external high-voltage electric field, the polymer solution forms a suspended conical droplet at the end of the nozzle. When the charge repulsion on the droplet surface exceeds its surface tension, the droplet is ejected at high speed to form a jet. The jet is further stretched to form nanofibers and finally deposited on the receiving device. With the development of technology, needle-type electrospinning is limited in production and the diameter of the needle is small. After a long period of spinning, the polymer solution is prone to solidification due to the volatilization of the solvent and water absorption, which leads to the clogging of the needle, which is not conducive to long-term stable production. The needleless nozzle has many excitation points, high production, and is not easy to be clogged. It is also convenient to clean after use, which is very suitable for mass production.

[0004] Conventional reciprocating wire electrodes are all exposed metal parts. As the spinning time increases, the solution on the surface of the wire electrode absorbs water and causes gelation. The middle part of the electrode wire is continuously scraped by the liquid supply device, resulting in the incompletely excited solution being scraped off and collected by the liquid collection tank below. The two ends of the wire electrode cannot be scraped by the liquid supply device, or the long-term coating causes the solution at both ends to overflow, which will gel over time and splash onto the receiving non-woven fabric, thereby affecting the product quality and failing to meet the application requirements.

[0005] To address this problem, some solutions have been proposed in the prior art, but some problems still exist.

[0006] 1. Use smooth wire electrodes: Smooth wire electrodes can promote the sliding of unexcited spinning solution to a certain extent, but they cannot completely eliminate the problem of splashing at both ends. At the same time, since there is no protruding structure on the surface of smooth wire electrodes, it is more difficult to excite, thus requiring higher voltage and increasing energy consumption;

[0007] 2. Adding a cleaning device to the coating system: Adding a cleaning device to the coating system can effectively solve the problem of gelation at both ends due to long-term spinning. However, if it is scraped all the time, it will cause waste of solution. In addition, if it is done at a fixed time or fixed point, the system will be more complicated, costly and prone to failure;

[0008] 3. Heating both ends of the electrode wire: Heating can soften the gel at both ends of the electrode wire so that it flows to the collecting tank, which can solve this problem well. However, electrospinning is carried out under high pressure. If high temperature is added, the danger is greatly increased, which is not conducive to production and application. Utility Model Content

[0009] The technical problem to be solved by the utility model is to provide an electrostatic spinning device for the above-mentioned prior art, which can solve the gel splashing phenomenon of the solution at both ends of the wire electrode due to long-term spinning and improve the quality of the wire electrode.

[0010] The technical solution adopted by the utility model to solve the above technical problems is: an electrostatic spinning device, comprising

[0011] Frame;

[0012] A wire electrode is arranged across the frame;

[0013] A coating device, which can be slidably disposed on the wire electrode and connected to the liquid supply device;

[0014] It is characterized by: it also includes

[0015] The scraper is reciprocatingly arranged at the ends of both ends of the wire electrode;

[0016] The liquid collecting tank is arranged at the bottom of the frame and below the liquid scraping member.

[0017] Preferably, the liquid-wiping member comprises a scraper plate, the scraper plate is provided with a through hole matching the wire electrode, and the wire electrode is inserted into the through hole of the scraper plate.

[0018] In order to ensure a good scraping effect, a rubber ring is provided in the through hole to fit the outer periphery of the wire electrode.

[0019] In order to avoid interference with the spinning process and affect the output of nanofibers, the through hole is opened at the upper end of the scraper, and the distance between the upper edge of the scraper and the axis of the rubber ring is less than 2 cm.

[0020] Preferably, the rubber ring is made of a material resistant to corrosion by organic solvents.

[0021] Preferably, the coating device comprises a body sleeved outside the wire electrode, the body having a liquid supply channel connected to the wire electrode, the body also connected to a liquid supply pipe connected to the liquid supply channel, and the body is connected to the liquid supply device through the liquid supply pipe.

[0022] In order to automatically realize the reciprocating scraping action of the scraper based on the sliding of the coating device on the wire electrode, the scraper is connected to the frame through an elastic member, and the sliding stroke of the coating device on the wire electrode is greater than the distance between the two scrapers on the corresponding wire electrode.

[0023] In order to ensure the stability of the movement of the wiper, the wiper is connected to the frame through at least two elastic members, and the elastic members are evenly connected to the wiper.

[0024] Preferably, the frame has a U-shaped cross section, and comprises a bottom plate and side plates connected to both sides of the bottom plate. The liquid collecting tank is fixed on the bottom plate, and the wire electrode is arranged between the two side plates.

[0025] Preferably, the end of the wire electrode is fixed to the side plate by a fixing member.

[0026] Compared with the prior art, the advantages of the utility model are: the electrospinning device in the utility model, by arranging a scraper at the end of the wire electrode, cleans the spinning liquid remaining at both ends of the wire electrode, and can prevent the gel caused by water absorption from splashing onto the produced product without affecting the coating performance, thereby improving the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional diagram of the electrospinning device in the embodiment of the utility model.

[0028] Figure 2 It is a three-dimensional diagram of the liquid scraping member in the embodiment of the utility model. DETAILED DESCRIPTION

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0030] like Figure 1 As shown, the electrospinning device in this embodiment includes a frame 1, a wire electrode 2, a coating device 3, a liquid scraping member 4, and a liquid collecting tank 5.

[0031] The frame body 1 has a U-shaped cross section, and includes a bottom plate 11 and side plates 12 connected to both sides of the bottom plate 11 . The liquid collecting tank 5 is fixed on the bottom plate 11 .

[0032] The wire electrode 2 is arranged between two side plates 12 of the frame 1 and is located above the liquid collecting tank 5 . Specifically, two ends of the wire electrode 2 are fixed to the upper surface of the side plates 12 through fixing members 21 .

[0033] The coating device 3 can be slidably arranged on the wire electrode 2 and connected to the liquid supply device. The coating device 3 includes a body 31 sleeved outside the wire electrode 2, and the body 31 has a liquid supply channel connected to the wire electrode 2. The body 31 is also connected to a liquid supply pipe 32 connected to the liquid supply channel, and the body 31 is connected to the liquid supply device through the liquid supply pipe 32. When working, the liquid supply device transports the spinning solution into the coating device 3, and the spinning solution is coated on the wire electrode 2 based on the sliding of the coating device 3 on the wire electrode 2. High voltage is applied to the wire electrode 2. Under the condition of the applied voltage, the spinning solution on the wire electrode 2 is excited to form nanofibers, which are then deposited on the receiving aggregate above the wire electrode 2. The driving of the coating device 3 can be achieved by setting a driving mechanism, and the driving mechanism can adopt the driving mechanism used in the electrostatic spinning device in the prior art.

[0034] The scraper 4 is reciprocatingly arranged at the ends of both ends of the wire electrode 2, and the liquid collecting tank 5 is arranged at the bottom of the frame 1 and is located below the movable range of the scraper 4. Based on the reciprocating movement of the scraper 4 at the end of the wire electrode 2, the spinning solution and other stains of the gel on the end of the wire electrode 2 can be well cleaned, and the cleaned solution is collected by the liquid collecting tank 5.

[0035] like Figure 2 As shown, the scraper 4 in this embodiment specifically includes a scraper 41, and a through hole matching the wire electrode 2 is provided on the scraper 41, and the wire electrode 2 is inserted into the through hole of the scraper 41. In order to ensure a good scraping effect, a rubber ring 42 is provided in the through hole to fit the outer periphery of the wire electrode 2. The rubber ring 42 can be made of a material resistant to organic solvent corrosion, such as butyl rubber, fluororubber, etc. In this embodiment, the inner diameter of the rubber ring 42 is 1.2 mm, the outer diameter is 1.5 mm, the thickness of the scraper 4 is 3 mm, the width is 5 cm, and the height is 12 cm. The through hole is provided at the upper end of the scraper 41, and the distance between the upper edge of the scraper 41 and the axis of the rubber ring 42 is less than 2 cm. The distance between the upper edge of the scraper 41 and the axis of the rubber ring 42 is limited because if the scraper 41 is too high, the nanofibers next to it will collide with the scraper 41 during the excitation process, resulting in floating fibers and a loss of production. When the distance between the upper edge of the scraper 41 and the axis of the rubber ring 42 is limited to a smaller range, interference with the spinning process can be avoided and the output of nanofibers can be guaranteed.

[0036] In addition, in order to automatically realize the reciprocating scraping action of the scraper 4 based on the sliding of the coating device 3 on the wire electrode 2, the scraper 4 is connected to the frame 1 through the elastic member 6, and the sliding stroke of the coating device 3 on the wire electrode 2 is greater than the distance between the two scrapers 4 on the corresponding wire electrode 2. In this embodiment, the distance between the two side plates 12 of the substrate is 100 cm, the sliding coating stroke of the coating device 3 on the wire electrode 2 is 80 cm, and the distance between the scraper 4 and the side plate 12 on the corresponding side is 15 cm. In this way, when the coating device 3 slides back and forth relative to the wire electrode 2 to coat the spinning solution, when the coating device 3 moves toward the end of the wire electrode 2, the coating device 3 can push the scraper 4, and when the coating device 3 leaves the end of the wire electrode 2, based on the rebound force of the elastic member 6, the scraper 4 is pushed to reset, so that the scraper 4 realizes the reciprocating movement on the wire electrode 2, and then realizes the timely cleaning of the spinning solution gel at both ends of the wire electrode 2.

[0037] In addition, in order to ensure the stability of the movement of the scraper 4, the scraper 4 is connected to the frame 1 through at least two elastic members 6, and the elastic members 6 are evenly connected to the scraper 4. In this embodiment, two elastic members 6 are connected to each scraper 4, and the two elastic members 6 are connected to the scraper 4 in the up and down direction.

[0038] The electrospinning device of the utility model provides a scraper 4 at the end of the wire electrode 2 to clean the spinning solution remaining at both ends of the wire electrode 2. On the basis of not affecting the coating performance, it can prevent the gel caused by water absorption from splashing onto the produced product, thereby improving the product quality.

[0039] In the specification and claims of the present utility model, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. An electrospinning device, comprising Frame (1); A wire electrode (2) is straddled on the frame (1); A coating device (3) which can be slidably disposed on the wire electrode (2) and is connected to the liquid supply device; Features: Also includes A liquid scraping member (4) is reciprocatingly arranged at the ends of both ends of the wire electrode (2); The liquid collecting tank (5) is arranged at the bottom of the frame (1) and is located below the liquid scraping member (4).

2. The electrospinning device according to claim 1, characterized in that: The liquid scraping member (4) comprises a scraper (41), the scraper (41) is provided with a through hole matching the wire electrode (2), and the wire electrode (2) is inserted into the through hole of the scraper (41).

3. The electrospinning device according to claim 2, characterized in that: A rubber ring (42) is arranged in the through hole and fits the outer periphery of the wire electrode (2).

4. The electrospinning device according to claim 3, characterized in that: The through hole is opened at the upper end of the scraper (41), and the distance between the upper edge of the scraper (41) and the axis of the rubber ring (42) is less than 2 cm.

5. The electrospinning device according to claim 3, characterized in that: The rubber ring (42) is a rubber ring (42) made of a material resistant to corrosion by organic solvents.

6. The electrospinning device according to any one of claims 1 to 5, characterized in that: The coating device (3) comprises a body (31) sleeved outside the wire electrode (2), the body (31) having a liquid supply channel connected to the wire electrode (2), the body (31) also being connected to a liquid supply pipe (32) connected to the liquid supply channel, and the body (31) being connected to the liquid supply device via the liquid supply pipe (32).

7. The electrospinning device according to claim 6, characterized in that: The scraping element (4) is connected to the frame (1) via an elastic element (6), and the sliding stroke of the coating device (3) on the line electrode (2) is greater than the distance between the two scraping elements (4) on the corresponding line electrode (2).

8. The electrospinning device according to claim 7, characterized in that: The liquid scraping member (4) is connected to the frame (1) via at least two elastic members (6), and the elastic members (6) are evenly connected to the liquid scraping member (4).

9. The electrospinning device according to any one of claims 1 to 5, characterized in that: The frame (1) has a U-shaped cross section, and comprises a bottom plate (11) and side plates (12) connected to both sides of the bottom plate (11); the liquid collecting tank (5) is fixed on the bottom plate (11); and the wire electrode (2) is mounted between the two side plates (12).

10. The electrospinning device according to claim 9, characterized in that: The end of the wire electrode (2) is fixed to the side plate (12) via a fixing member (21).

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